FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavcodec/wmaprodec.c
Date: 2022-11-26 13:19:19
Exec Total Coverage
Lines: 614 927 66.2%
Branches: 353 624 56.6%

Line Branch Exec Source
1 /*
2 * Wmapro compatible decoder
3 * Copyright (c) 2007 Baptiste Coudurier, Benjamin Larsson, Ulion
4 * Copyright (c) 2008 - 2011 Sascha Sommer, Benjamin Larsson
5 *
6 * This file is part of FFmpeg.
7 *
8 * FFmpeg is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Lesser General Public
10 * License as published by the Free Software Foundation; either
11 * version 2.1 of the License, or (at your option) any later version.
12 *
13 * FFmpeg is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Lesser General Public License for more details.
17 *
18 * You should have received a copy of the GNU Lesser General Public
19 * License along with FFmpeg; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21 */
22
23 /**
24 * @file
25 * @brief wmapro decoder implementation
26 * Wmapro is an MDCT based codec comparable to wma standard or AAC.
27 * The decoding therefore consists of the following steps:
28 * - bitstream decoding
29 * - reconstruction of per-channel data
30 * - rescaling and inverse quantization
31 * - IMDCT
32 * - windowing and overlapp-add
33 *
34 * The compressed wmapro bitstream is split into individual packets.
35 * Every such packet contains one or more wma frames.
36 * The compressed frames may have a variable length and frames may
37 * cross packet boundaries.
38 * Common to all wmapro frames is the number of samples that are stored in
39 * a frame.
40 * The number of samples and a few other decode flags are stored
41 * as extradata that has to be passed to the decoder.
42 *
43 * The wmapro frames themselves are again split into a variable number of
44 * subframes. Every subframe contains the data for 2^N time domain samples
45 * where N varies between 7 and 12.
46 *
47 * Example wmapro bitstream (in samples):
48 *
49 * || packet 0 || packet 1 || packet 2 packets
50 * ---------------------------------------------------
51 * || frame 0 || frame 1 || frame 2 || frames
52 * ---------------------------------------------------
53 * || | | || | | | || || subframes of channel 0
54 * ---------------------------------------------------
55 * || | | || | | | || || subframes of channel 1
56 * ---------------------------------------------------
57 *
58 * The frame layouts for the individual channels of a wma frame does not need
59 * to be the same.
60 *
61 * However, if the offsets and lengths of several subframes of a frame are the
62 * same, the subframes of the channels can be grouped.
63 * Every group may then use special coding techniques like M/S stereo coding
64 * to improve the compression ratio. These channel transformations do not
65 * need to be applied to a whole subframe. Instead, they can also work on
66 * individual scale factor bands (see below).
67 * The coefficients that carry the audio signal in the frequency domain
68 * are transmitted as huffman-coded vectors with 4, 2 and 1 elements.
69 * In addition to that, the encoder can switch to a runlevel coding scheme
70 * by transmitting subframe_length / 128 zero coefficients.
71 *
72 * Before the audio signal can be converted to the time domain, the
73 * coefficients have to be rescaled and inverse quantized.
74 * A subframe is therefore split into several scale factor bands that get
75 * scaled individually.
76 * Scale factors are submitted for every frame but they might be shared
77 * between the subframes of a channel. Scale factors are initially DPCM-coded.
78 * Once scale factors are shared, the differences are transmitted as runlevel
79 * codes.
80 * Every subframe length and offset combination in the frame layout shares a
81 * common quantization factor that can be adjusted for every channel by a
82 * modifier.
83 * After the inverse quantization, the coefficients get processed by an IMDCT.
84 * The resulting values are then windowed with a sine window and the first half
85 * of the values are added to the second half of the output from the previous
86 * subframe in order to reconstruct the output samples.
87 */
88
89 #include <inttypes.h>
90
91 #include "libavutil/audio_fifo.h"
92 #include "libavutil/tx.h"
93 #include "libavutil/ffmath.h"
94 #include "libavutil/float_dsp.h"
95 #include "libavutil/intfloat.h"
96 #include "libavutil/intreadwrite.h"
97 #include "libavutil/mem_internal.h"
98 #include "libavutil/thread.h"
99
100 #include "avcodec.h"
101 #include "codec_internal.h"
102 #include "decode.h"
103 #include "get_bits.h"
104 #include "internal.h"
105 #include "put_bits.h"
106 #include "wmaprodata.h"
107 #include "sinewin.h"
108 #include "wma.h"
109 #include "wma_common.h"
110
111 /** current decoder limitations */
112 #define WMAPRO_MAX_CHANNELS 8 ///< max number of handled channels
113 #define MAX_SUBFRAMES 32 ///< max number of subframes per channel
114 #define MAX_BANDS 29 ///< max number of scale factor bands
115 #define MAX_FRAMESIZE 32768 ///< maximum compressed frame size
116 #define XMA_MAX_STREAMS 8
117 #define XMA_MAX_CHANNELS_STREAM 2
118 #define XMA_MAX_CHANNELS (XMA_MAX_STREAMS * XMA_MAX_CHANNELS_STREAM)
119
120 #define WMAPRO_BLOCK_MIN_BITS 6 ///< log2 of min block size
121 #define WMAPRO_BLOCK_MAX_BITS 13 ///< log2 of max block size
122 #define WMAPRO_BLOCK_MIN_SIZE (1 << WMAPRO_BLOCK_MIN_BITS) ///< minimum block size
123 #define WMAPRO_BLOCK_MAX_SIZE (1 << WMAPRO_BLOCK_MAX_BITS) ///< maximum block size
124 #define WMAPRO_BLOCK_SIZES (WMAPRO_BLOCK_MAX_BITS - WMAPRO_BLOCK_MIN_BITS + 1) ///< possible block sizes
125
126
127 #define VLCBITS 9
128 #define SCALEVLCBITS 8
129 #define VEC4MAXDEPTH ((HUFF_VEC4_MAXBITS+VLCBITS-1)/VLCBITS)
130 #define VEC2MAXDEPTH ((HUFF_VEC2_MAXBITS+VLCBITS-1)/VLCBITS)
131 #define VEC1MAXDEPTH ((HUFF_VEC1_MAXBITS+VLCBITS-1)/VLCBITS)
132 #define SCALEMAXDEPTH ((HUFF_SCALE_MAXBITS+SCALEVLCBITS-1)/SCALEVLCBITS)
133 #define SCALERLMAXDEPTH ((HUFF_SCALE_RL_MAXBITS+VLCBITS-1)/VLCBITS)
134
135 static VLC sf_vlc; ///< scale factor DPCM vlc
136 static VLC sf_rl_vlc; ///< scale factor run length vlc
137 static VLC vec4_vlc; ///< 4 coefficients per symbol
138 static VLC vec2_vlc; ///< 2 coefficients per symbol
139 static VLC vec1_vlc; ///< 1 coefficient per symbol
140 static VLC coef_vlc[2]; ///< coefficient run length vlc codes
141 static float sin64[33]; ///< sine table for decorrelation
142
143 /**
144 * @brief frame specific decoder context for a single channel
145 */
146 typedef struct WMAProChannelCtx {
147 int16_t prev_block_len; ///< length of the previous block
148 uint8_t transmit_coefs;
149 uint8_t num_subframes;
150 uint16_t subframe_len[MAX_SUBFRAMES]; ///< subframe length in samples
151 uint16_t subframe_offset[MAX_SUBFRAMES]; ///< subframe positions in the current frame
152 uint8_t cur_subframe; ///< current subframe number
153 uint16_t decoded_samples; ///< number of already processed samples
154 uint8_t grouped; ///< channel is part of a group
155 int quant_step; ///< quantization step for the current subframe
156 int8_t reuse_sf; ///< share scale factors between subframes
157 int8_t scale_factor_step; ///< scaling step for the current subframe
158 int max_scale_factor; ///< maximum scale factor for the current subframe
159 int saved_scale_factors[2][MAX_BANDS]; ///< resampled and (previously) transmitted scale factor values
160 int8_t scale_factor_idx; ///< index for the transmitted scale factor values (used for resampling)
161 int* scale_factors; ///< pointer to the scale factor values used for decoding
162 uint8_t table_idx; ///< index in sf_offsets for the scale factor reference block
163 float* coeffs; ///< pointer to the subframe decode buffer
164 uint16_t num_vec_coeffs; ///< number of vector coded coefficients
165 DECLARE_ALIGNED(32, float, out)[WMAPRO_BLOCK_MAX_SIZE + WMAPRO_BLOCK_MAX_SIZE / 2]; ///< output buffer
166 } WMAProChannelCtx;
167
168 /**
169 * @brief channel group for channel transformations
170 */
171 typedef struct WMAProChannelGrp {
172 uint8_t num_channels; ///< number of channels in the group
173 int8_t transform; ///< transform on / off
174 int8_t transform_band[MAX_BANDS]; ///< controls if the transform is enabled for a certain band
175 float decorrelation_matrix[WMAPRO_MAX_CHANNELS*WMAPRO_MAX_CHANNELS];
176 float* channel_data[WMAPRO_MAX_CHANNELS]; ///< transformation coefficients
177 } WMAProChannelGrp;
178
179 /**
180 * @brief main decoder context
181 */
182 typedef struct WMAProDecodeCtx {
183 /* generic decoder variables */
184 AVCodecContext* avctx; ///< codec context for av_log
185 AVFloatDSPContext *fdsp;
186 uint8_t frame_data[MAX_FRAMESIZE +
187 AV_INPUT_BUFFER_PADDING_SIZE];///< compressed frame data
188 PutBitContext pb; ///< context for filling the frame_data buffer
189 AVTXContext *tx[WMAPRO_BLOCK_SIZES]; ///< MDCT context per block size
190 av_tx_fn tx_fn[WMAPRO_BLOCK_SIZES];
191 DECLARE_ALIGNED(32, float, tmp)[WMAPRO_BLOCK_MAX_SIZE]; ///< IMDCT output buffer
192 const float* windows[WMAPRO_BLOCK_SIZES]; ///< windows for the different block sizes
193
194 /* frame size dependent frame information (set during initialization) */
195 uint32_t decode_flags; ///< used compression features
196 uint8_t len_prefix; ///< frame is prefixed with its length
197 uint8_t dynamic_range_compression; ///< frame contains DRC data
198 uint8_t bits_per_sample; ///< integer audio sample size for the unscaled IMDCT output (used to scale to [-1.0, 1.0])
199 uint16_t samples_per_frame; ///< number of samples to output
200 uint16_t trim_start; ///< number of samples to skip at start
201 uint16_t trim_end; ///< number of samples to skip at end
202 uint16_t log2_frame_size;
203 int8_t lfe_channel; ///< lfe channel index
204 uint8_t max_num_subframes;
205 uint8_t subframe_len_bits; ///< number of bits used for the subframe length
206 uint8_t max_subframe_len_bit; ///< flag indicating that the subframe is of maximum size when the first subframe length bit is 1
207 uint16_t min_samples_per_subframe;
208 int8_t num_sfb[WMAPRO_BLOCK_SIZES]; ///< scale factor bands per block size
209 int16_t sfb_offsets[WMAPRO_BLOCK_SIZES][MAX_BANDS]; ///< scale factor band offsets (multiples of 4)
210 int8_t sf_offsets[WMAPRO_BLOCK_SIZES][WMAPRO_BLOCK_SIZES][MAX_BANDS]; ///< scale factor resample matrix
211 int16_t subwoofer_cutoffs[WMAPRO_BLOCK_SIZES]; ///< subwoofer cutoff values
212
213 /* packet decode state */
214 GetBitContext pgb; ///< bitstream reader context for the packet
215 int next_packet_start; ///< start offset of the next wma packet in the demuxer packet
216 uint8_t packet_offset; ///< frame offset in the packet
217 uint8_t packet_sequence_number; ///< current packet number
218 int num_saved_bits; ///< saved number of bits
219 int frame_offset; ///< frame offset in the bit reservoir
220 int subframe_offset; ///< subframe offset in the bit reservoir
221 uint8_t packet_loss; ///< set in case of bitstream error
222 uint8_t packet_done; ///< set when a packet is fully decoded
223 uint8_t eof_done; ///< set when EOF reached and extra subframe is written (XMA1/2)
224
225 /* frame decode state */
226 uint32_t frame_num; ///< current frame number (not used for decoding)
227 GetBitContext gb; ///< bitstream reader context
228 int buf_bit_size; ///< buffer size in bits
229 uint8_t drc_gain; ///< gain for the DRC tool
230 int8_t skip_frame; ///< skip output step
231 int8_t parsed_all_subframes; ///< all subframes decoded?
232 uint8_t skip_packets; ///< packets to skip to find next packet in a stream (XMA1/2)
233
234 /* subframe/block decode state */
235 int16_t subframe_len; ///< current subframe length
236 int8_t nb_channels; ///< number of channels in stream (XMA1/2)
237 int8_t channels_for_cur_subframe; ///< number of channels that contain the subframe
238 int8_t channel_indexes_for_cur_subframe[WMAPRO_MAX_CHANNELS];
239 int8_t num_bands; ///< number of scale factor bands
240 int8_t transmit_num_vec_coeffs; ///< number of vector coded coefficients is part of the bitstream
241 int16_t* cur_sfb_offsets; ///< sfb offsets for the current block
242 uint8_t table_idx; ///< index for the num_sfb, sfb_offsets, sf_offsets and subwoofer_cutoffs tables
243 int8_t esc_len; ///< length of escaped coefficients
244
245 uint8_t num_chgroups; ///< number of channel groups
246 WMAProChannelGrp chgroup[WMAPRO_MAX_CHANNELS]; ///< channel group information
247
248 WMAProChannelCtx channel[WMAPRO_MAX_CHANNELS]; ///< per channel data
249 } WMAProDecodeCtx;
250
251 typedef struct XMADecodeCtx {
252 WMAProDecodeCtx xma[XMA_MAX_STREAMS];
253 AVFrame *frames[XMA_MAX_STREAMS];
254 int current_stream;
255 int num_streams;
256 AVAudioFifo *samples[2][XMA_MAX_STREAMS];
257 int start_channel[XMA_MAX_STREAMS];
258 int trim_start, trim_end;
259 int flushed;
260 } XMADecodeCtx;
261
262 /**
263 *@brief helper function to print the most important members of the context
264 *@param s context
265 */
266 static av_cold void dump_context(WMAProDecodeCtx *s)
267 {
268 #define PRINT(a, b) av_log(s->avctx, AV_LOG_DEBUG, " %s = %d\n", a, b);
269 #define PRINT_HEX(a, b) av_log(s->avctx, AV_LOG_DEBUG, " %s = %"PRIx32"\n", a, b);
270
271 PRINT("ed sample bit depth", s->bits_per_sample);
272 PRINT_HEX("ed decode flags", s->decode_flags);
273 PRINT("samples per frame", s->samples_per_frame);
274 PRINT("log2 frame size", s->log2_frame_size);
275 PRINT("max num subframes", s->max_num_subframes);
276 PRINT("len prefix", s->len_prefix);
277 PRINT("num channels", s->nb_channels);
278 }
279
280 /**
281 *@brief Uninitialize the decoder and free all resources.
282 *@param avctx codec context
283 *@return 0 on success, < 0 otherwise
284 */
285 8 static av_cold int decode_end(WMAProDecodeCtx *s)
286 {
287 int i;
288
289 8 av_freep(&s->fdsp);
290
291
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72 for (i = 0; i < WMAPRO_BLOCK_SIZES; i++)
292 64 av_tx_uninit(&s->tx[i]);
293
294 8 return 0;
295 }
296
297 8 static av_cold int wmapro_decode_end(AVCodecContext *avctx)
298 {
299 8 WMAProDecodeCtx *s = avctx->priv_data;
300
301 8 decode_end(s);
302
303 8 return 0;
304 }
305
306 40 static av_cold int get_rate(AVCodecContext *avctx)
307 {
308
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40 if (avctx->codec_id != AV_CODEC_ID_WMAPRO) { // XXX: is this really only for XMA?
309 if (avctx->sample_rate > 44100)
310 return 48000;
311 else if (avctx->sample_rate > 32000)
312 return 44100;
313 else if (avctx->sample_rate > 24000)
314 return 32000;
315 return 24000;
316 }
317
318 40 return avctx->sample_rate;
319 }
320
321 5 static av_cold void decode_init_static(void)
322 {
323 5 INIT_VLC_STATIC_FROM_LENGTHS(&sf_vlc, SCALEVLCBITS, HUFF_SCALE_SIZE,
324 &scale_table[0][1], 2,
325 &scale_table[0][0], 2, 1, -60, 0, 616);
326 5 INIT_VLC_STATIC_FROM_LENGTHS(&sf_rl_vlc, VLCBITS, HUFF_SCALE_RL_SIZE,
327 &scale_rl_table[0][1], 2,
328 &scale_rl_table[0][0], 2, 1, 0, 0, 1406);
329 5 INIT_VLC_STATIC_FROM_LENGTHS(&coef_vlc[0], VLCBITS, HUFF_COEF0_SIZE,
330 coef0_lens, 1,
331 coef0_syms, 2, 2, 0, 0, 2108);
332 5 INIT_VLC_STATIC_FROM_LENGTHS(&coef_vlc[1], VLCBITS, HUFF_COEF1_SIZE,
333 &coef1_table[0][1], 2,
334 &coef1_table[0][0], 2, 1, 0, 0, 3912);
335 5 INIT_VLC_STATIC_FROM_LENGTHS(&vec4_vlc, VLCBITS, HUFF_VEC4_SIZE,
336 vec4_lens, 1,
337 vec4_syms, 2, 2, -1, 0, 604);
338 5 INIT_VLC_STATIC_FROM_LENGTHS(&vec2_vlc, VLCBITS, HUFF_VEC2_SIZE,
339 &vec2_table[0][1], 2,
340 &vec2_table[0][0], 2, 1, -1, 0, 562);
341 5 INIT_VLC_STATIC_FROM_LENGTHS(&vec1_vlc, VLCBITS, HUFF_VEC1_SIZE,
342 &vec1_table[0][1], 2,
343 &vec1_table[0][0], 2, 1, 0, 0, 562);
344
345 /** calculate sine values for the decorrelation matrix */
346
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170 for (int i = 0; i < 33; i++)
347 165 sin64[i] = sin(i * M_PI / 64.0);
348
349
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45 for (int i = WMAPRO_BLOCK_MIN_BITS; i <= WMAPRO_BLOCK_MAX_BITS; i++)
350 40 ff_init_ff_sine_windows(i);
351 5 }
352
353 /**
354 *@brief Initialize the decoder.
355 *@param avctx codec context
356 *@return 0 on success, -1 otherwise
357 */
358 8 static av_cold int decode_init(WMAProDecodeCtx *s, AVCodecContext *avctx, int num_stream)
359 {
360 static AVOnce init_static_once = AV_ONCE_INIT;
361 8 uint8_t *edata_ptr = avctx->extradata;
362 unsigned int channel_mask;
363 int i, bits;
364 int log2_max_num_subframes;
365 int num_possible_block_sizes;
366
367
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8 if (avctx->codec_id == AV_CODEC_ID_XMA1 || avctx->codec_id == AV_CODEC_ID_XMA2)
368 avctx->block_align = 2048;
369
370
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8 if (!avctx->block_align) {
371 av_log(avctx, AV_LOG_ERROR, "block_align is not set\n");
372 return AVERROR(EINVAL);
373 }
374
375 8 s->avctx = avctx;
376
377 8 init_put_bits(&s->pb, s->frame_data, MAX_FRAMESIZE);
378
379 8 avctx->sample_fmt = AV_SAMPLE_FMT_FLTP;
380
381 /** dump the extradata */
382 8 av_log(avctx, AV_LOG_DEBUG, "extradata:\n");
383
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152 for (i = 0; i < avctx->extradata_size; i++)
384 144 av_log(avctx, AV_LOG_DEBUG, "[%x] ", avctx->extradata[i]);
385 8 av_log(avctx, AV_LOG_DEBUG, "\n");
386
387
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8 if (avctx->codec_id == AV_CODEC_ID_XMA2 && avctx->extradata_size == 34) { /* XMA2WAVEFORMATEX */
388 s->decode_flags = 0x10d6;
389 s->bits_per_sample = 16;
390 channel_mask = 0; //AV_RL32(edata_ptr+2); /* not always in expected order */
391 if ((num_stream+1) * XMA_MAX_CHANNELS_STREAM > avctx->ch_layout.nb_channels) /* stream config is 2ch + 2ch + ... + 1/2ch */
392 s->nb_channels = 1;
393 else
394 s->nb_channels = 2;
395
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8 } else if (avctx->codec_id == AV_CODEC_ID_XMA2) { /* XMA2WAVEFORMAT */
396 s->decode_flags = 0x10d6;
397 s->bits_per_sample = 16;
398 channel_mask = 0; /* would need to aggregate from all streams */
399 s->nb_channels = edata_ptr[32 + ((edata_ptr[0]==3)?0:8) + 4*num_stream + 0]; /* nth stream config */
400
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8 } else if (avctx->codec_id == AV_CODEC_ID_XMA1) { /* XMAWAVEFORMAT */
401 s->decode_flags = 0x10d6;
402 s->bits_per_sample = 16;
403 channel_mask = 0; /* would need to aggregate from all streams */
404 s->nb_channels = edata_ptr[8 + 20*num_stream + 17]; /* nth stream config */
405
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8 } else if (avctx->codec_id == AV_CODEC_ID_WMAPRO && avctx->extradata_size >= 18) {
406 8 s->decode_flags = AV_RL16(edata_ptr+14);
407 8 channel_mask = AV_RL32(edata_ptr+2);
408 8 s->bits_per_sample = AV_RL16(edata_ptr);
409
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8 s->nb_channels = channel_mask ? av_popcount(channel_mask) : avctx->ch_layout.nb_channels;
410
411
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8 if (s->bits_per_sample > 32 || s->bits_per_sample < 1) {
412 avpriv_request_sample(avctx, "bits per sample is %d", s->bits_per_sample);
413 return AVERROR_PATCHWELCOME;
414 }
415 } else {
416 avpriv_request_sample(avctx, "Unknown extradata size");
417 return AVERROR_PATCHWELCOME;
418 }
419
420 /** generic init */
421 8 s->log2_frame_size = av_log2(avctx->block_align) + 4;
422
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8 if (s->log2_frame_size > 25) {
423 avpriv_request_sample(avctx, "Large block align");
424 return AVERROR_PATCHWELCOME;
425 }
426
427 /** frame info */
428 8 s->skip_frame = 1; /* skip first frame */
429
430 8 s->packet_loss = 1;
431 8 s->len_prefix = (s->decode_flags & 0x40);
432
433 /** get frame len */
434
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8 if (avctx->codec_id == AV_CODEC_ID_WMAPRO) {
435 8 bits = ff_wma_get_frame_len_bits(avctx->sample_rate, 3, s->decode_flags);
436
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8 if (bits > WMAPRO_BLOCK_MAX_BITS) {
437 avpriv_request_sample(avctx, "14-bit block sizes");
438 return AVERROR_PATCHWELCOME;
439 }
440 8 s->samples_per_frame = 1 << bits;
441 } else {
442 s->samples_per_frame = 512;
443 }
444
445 /** subframe info */
446 8 log2_max_num_subframes = ((s->decode_flags & 0x38) >> 3);
447 8 s->max_num_subframes = 1 << log2_max_num_subframes;
448
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8 if (s->max_num_subframes == 16 || s->max_num_subframes == 4)
449 8 s->max_subframe_len_bit = 1;
450 8 s->subframe_len_bits = av_log2(log2_max_num_subframes) + 1;
451
452 8 num_possible_block_sizes = log2_max_num_subframes + 1;
453 8 s->min_samples_per_subframe = s->samples_per_frame / s->max_num_subframes;
454 8 s->dynamic_range_compression = (s->decode_flags & 0x80);
455
456
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8 if (s->max_num_subframes > MAX_SUBFRAMES) {
457 av_log(avctx, AV_LOG_ERROR, "invalid number of subframes %"PRId8"\n",
458 s->max_num_subframes);
459 return AVERROR_INVALIDDATA;
460 }
461
462
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8 if (s->min_samples_per_subframe < WMAPRO_BLOCK_MIN_SIZE) {
463 av_log(avctx, AV_LOG_ERROR, "min_samples_per_subframe of %d too small\n",
464 s->min_samples_per_subframe);
465 return AVERROR_INVALIDDATA;
466 }
467
468
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8 if (s->avctx->sample_rate <= 0) {
469 av_log(avctx, AV_LOG_ERROR, "invalid sample rate\n");
470 return AVERROR_INVALIDDATA;
471 }
472
473
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8 if (s->nb_channels <= 0) {
474 av_log(avctx, AV_LOG_ERROR, "invalid number of channels %d\n",
475 s->nb_channels);
476 return AVERROR_INVALIDDATA;
477
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8 } else if (avctx->codec_id != AV_CODEC_ID_WMAPRO && s->nb_channels > XMA_MAX_CHANNELS_STREAM) {
478 av_log(avctx, AV_LOG_ERROR, "invalid number of channels per XMA stream %d\n",
479 s->nb_channels);
480 return AVERROR_INVALIDDATA;
481
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8 } else if (s->nb_channels > WMAPRO_MAX_CHANNELS || s->nb_channels > avctx->ch_layout.nb_channels) {
482 avpriv_request_sample(avctx,
483 "More than %d channels", WMAPRO_MAX_CHANNELS);
484 return AVERROR_PATCHWELCOME;
485 }
486
487 /** init previous block len */
488
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32 for (i = 0; i < s->nb_channels; i++)
489 24 s->channel[i].prev_block_len = s->samples_per_frame;
490
491 /** extract lfe channel position */
492 8 s->lfe_channel = -1;
493
494
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8 if (channel_mask & 8) {
495 unsigned int mask;
496
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10 for (mask = 1; mask < 16; mask <<= 1) {
497
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8 if (channel_mask & mask)
498 8 ++s->lfe_channel;
499 }
500 }
501
502 /** calculate number of scale factor bands and their offsets
503 for every possible block size */
504
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48 for (i = 0; i < num_possible_block_sizes; i++) {
505 40 int subframe_len = s->samples_per_frame >> i;
506 int x;
507 40 int band = 1;
508 40 int rate = get_rate(avctx);
509
510 40 s->sfb_offsets[i][0] = 0;
511
512
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1040 for (x = 0; x < MAX_BANDS-1 && s->sfb_offsets[i][band - 1] < subframe_len; x++) {
513 1040 int offset = (subframe_len * 2 * critical_freq[x]) / rate + 2;
514 1040 offset &= ~3;
515
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1040 if (offset > s->sfb_offsets[i][band - 1])
516 860 s->sfb_offsets[i][band++] = offset;
517
518
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1040 if (offset >= subframe_len)
519 40 break;
520 }
521 40 s->sfb_offsets[i][band - 1] = subframe_len;
522 40 s->num_sfb[i] = band - 1;
523
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40 if (s->num_sfb[i] <= 0) {
524 av_log(avctx, AV_LOG_ERROR, "num_sfb invalid\n");
525 return AVERROR_INVALIDDATA;
526 }
527 }
528
529
530 /** Scale factors can be shared between blocks of different size
531 as every block has a different scale factor band layout.
532 The matrix sf_offsets is needed to find the correct scale factor.
533 */
534
535
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48 for (i = 0; i < num_possible_block_sizes; i++) {
536 int b;
537
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900 for (b = 0; b < s->num_sfb[i]; b++) {
538 int x;
539 860 int offset = ((s->sfb_offsets[i][b]
540 860 + s->sfb_offsets[i][b + 1] - 1) << i) >> 1;
541
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5160 for (x = 0; x < num_possible_block_sizes; x++) {
542 4300 int v = 0;
543
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48176 while (s->sfb_offsets[x][v + 1] << x < offset) {
544 43876 v++;
545
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43876 av_assert0(v < MAX_BANDS);
546 }
547 4300 s->sf_offsets[i][x][b] = v;
548 }
549 }
550 }
551
552 8 s->fdsp = avpriv_float_dsp_alloc(avctx->flags & AV_CODEC_FLAG_BITEXACT);
553
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8 if (!s->fdsp)
554 return AVERROR(ENOMEM);
555
556 /** init MDCT, FIXME: only init needed sizes */
557
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72 for (i = 0; i < WMAPRO_BLOCK_SIZES; i++) {
558 64 const float scale = 1.0 / (1 << (WMAPRO_BLOCK_MIN_BITS + i - 1))
559 64 / (1ll << (s->bits_per_sample - 1));
560 64 int err = av_tx_init(&s->tx[i], &s->tx_fn[i], AV_TX_FLOAT_MDCT, 1,
561 64 1 << (WMAPRO_BLOCK_MIN_BITS + i), &scale, 0);
562
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64 if (err < 0)
563 return err;
564 }
565
566 /** init MDCT windows: simple sine window */
567
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72 for (i = 0; i < WMAPRO_BLOCK_SIZES; i++) {
568 64 const int win_idx = WMAPRO_BLOCK_MAX_BITS - i;
569 64 s->windows[WMAPRO_BLOCK_SIZES - i - 1] = ff_sine_windows[win_idx];
570 }
571
572 /** calculate subwoofer cutoff values */
573
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48 for (i = 0; i < num_possible_block_sizes; i++) {
574 40 int block_size = s->samples_per_frame >> i;
575 40 int cutoff = (440*block_size + 3LL * (s->avctx->sample_rate >> 1) - 1)
576 40 / s->avctx->sample_rate;
577 40 s->subwoofer_cutoffs[i] = av_clip(cutoff, 4, block_size);
578 }
579
580
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8 if (avctx->debug & FF_DEBUG_BITSTREAM)
581 dump_context(s);
582
583
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8 if (avctx->codec_id == AV_CODEC_ID_WMAPRO) {
584
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8 if (channel_mask) {
585 8 av_channel_layout_uninit(&avctx->ch_layout);
586 8 av_channel_layout_from_mask(&avctx->ch_layout, channel_mask);
587 } else
588 avctx->ch_layout.order = AV_CHANNEL_ORDER_UNSPEC;
589 }
590
591 8 ff_thread_once(&init_static_once, decode_init_static);
592
593 8 return 0;
594 }
595
596 /**
597 *@brief Initialize the decoder.
598 *@param avctx codec context
599 *@return 0 on success, -1 otherwise
600 */
601 8 static av_cold int wmapro_decode_init(AVCodecContext *avctx)
602 {
603 8 WMAProDecodeCtx *s = avctx->priv_data;
604
605 8 return decode_init(s, avctx, 0);
606 }
607
608 /**
609 *@brief Decode the subframe length.
610 *@param s context
611 *@param offset sample offset in the frame
612 *@return decoded subframe length on success, < 0 in case of an error
613 */
614 527 static int decode_subframe_length(WMAProDecodeCtx *s, int offset)
615 {
616 527 int frame_len_shift = 0;
617 int subframe_len;
618
619 /** no need to read from the bitstream when only one length is possible */
620
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527 if (offset == s->samples_per_frame - s->min_samples_per_subframe)
621 9 return s->min_samples_per_subframe;
622
623
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518 if (get_bits_left(&s->gb) < 1)
624 return AVERROR_INVALIDDATA;
625
626 /** 1 bit indicates if the subframe is of maximum length */
627
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518 if (s->max_subframe_len_bit) {
628
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518 if (get_bits1(&s->gb))
629 279 frame_len_shift = 1 + get_bits(&s->gb, s->subframe_len_bits-1);
630 } else
631 frame_len_shift = get_bits(&s->gb, s->subframe_len_bits);
632
633 518 subframe_len = s->samples_per_frame >> frame_len_shift;
634
635 /** sanity check the length */
636
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518 if (subframe_len < s->min_samples_per_subframe ||
637
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518 subframe_len > s->samples_per_frame) {
638 av_log(s->avctx, AV_LOG_ERROR, "broken frame: subframe_len %i\n",
639 subframe_len);
640 return AVERROR_INVALIDDATA;
641 }
642 518 return subframe_len;
643 }
644
645 /**
646 *@brief Decode how the data in the frame is split into subframes.
647 * Every WMA frame contains the encoded data for a fixed number of
648 * samples per channel. The data for every channel might be split
649 * into several subframes. This function will reconstruct the list of
650 * subframes for every channel.
651 *
652 * If the subframes are not evenly split, the algorithm estimates the
653 * channels with the lowest number of total samples.
654 * Afterwards, for each of these channels a bit is read from the
655 * bitstream that indicates if the channel contains a subframe with the
656 * next subframe size that is going to be read from the bitstream or not.
657 * If a channel contains such a subframe, the subframe size gets added to
658 * the channel's subframe list.
659 * The algorithm repeats these steps until the frame is properly divided
660 * between the individual channels.
661 *
662 *@param s context
663 *@return 0 on success, < 0 in case of an error
664 */
665 257 static int decode_tilehdr(WMAProDecodeCtx *s)
666 {
667 257 uint16_t num_samples[WMAPRO_MAX_CHANNELS] = { 0 };/**< sum of samples for all currently known subframes of a channel */
668 uint8_t contains_subframe[WMAPRO_MAX_CHANNELS]; /**< flag indicating if a channel contains the current subframe */
669 257 int channels_for_cur_subframe = s->nb_channels; /**< number of channels that contain the current subframe */
670 257 int fixed_channel_layout = 0; /**< flag indicating that all channels use the same subframe offsets and sizes */
671 257 int min_channel_len = 0; /**< smallest sum of samples (channels with this length will be processed first) */
672 int c;
673
674 /* Should never consume more than 3073 bits (256 iterations for the
675 * while loop when always the minimum amount of 128 samples is subtracted
676 * from missing samples in the 8 channel case).
677 * 1 + BLOCK_MAX_SIZE * MAX_CHANNELS / BLOCK_MIN_SIZE * (MAX_CHANNELS + 4)
678 */
679
680 /** reset tiling information */
681
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1183 for (c = 0; c < s->nb_channels; c++)
682 926 s->channel[c].num_subframes = 0;
683
684
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257 if (s->max_num_subframes == 1 || get_bits1(&s->gb))
685 225 fixed_channel_layout = 1;
686
687 /** loop until the frame data is split between the subframes */
688 do {
689 int subframe_len;
690
691 /** check which channels contain the subframe */
692
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2813 for (c = 0; c < s->nb_channels; c++) {
693
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2286 if (num_samples[c] == min_channel_len) {
694
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1277 if (fixed_channel_layout || channels_for_cur_subframe == 1 ||
695
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224 (min_channel_len == s->samples_per_frame - s->min_samples_per_subframe))
696 1053 contains_subframe[c] = 1;
697 else
698 224 contains_subframe[c] = get_bits1(&s->gb);
699 } else
700 1009 contains_subframe[c] = 0;
701 }
702
703 /** get subframe length, subframe_len == 0 is not allowed */
704
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527 if ((subframe_len = decode_subframe_length(s, min_channel_len)) <= 0)
705 return AVERROR_INVALIDDATA;
706
707 /** add subframes to the individual channels and find new min_channel_len */
708 527 min_channel_len += subframe_len;
709
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2813 for (c = 0; c < s->nb_channels; c++) {
710 2286 WMAProChannelCtx* chan = &s->channel[c];
711
712
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2286 if (contains_subframe[c]) {
713
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1234 if (chan->num_subframes >= MAX_SUBFRAMES) {
714 av_log(s->avctx, AV_LOG_ERROR,
715 "broken frame: num subframes > 31\n");
716 return AVERROR_INVALIDDATA;
717 }
718 1234 chan->subframe_len[chan->num_subframes] = subframe_len;
719 1234 num_samples[c] += subframe_len;
720 1234 ++chan->num_subframes;
721
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1234 if (num_samples[c] > s->samples_per_frame) {
722 av_log(s->avctx, AV_LOG_ERROR, "broken frame: "
723 "channel len > samples_per_frame\n");
724 return AVERROR_INVALIDDATA;
725 }
726
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1052 } else if (num_samples[c] <= min_channel_len) {
727
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211 if (num_samples[c] < min_channel_len) {
728 43 channels_for_cur_subframe = 0;
729 43 min_channel_len = num_samples[c];
730 }
731 211 ++channels_for_cur_subframe;
732 }
733 }
734
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527 } while (min_channel_len < s->samples_per_frame);
735
736
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1183 for (c = 0; c < s->nb_channels; c++) {
737 int i;
738 926 int offset = 0;
739
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2160 for (i = 0; i < s->channel[c].num_subframes; i++) {
740 ff_dlog(s->avctx, "frame[%"PRIu32"] channel[%i] subframe[%i]"
741 " len %i\n", s->frame_num, c, i,
742 s->channel[c].subframe_len[i]);
743 1234 s->channel[c].subframe_offset[i] = offset;
744 1234 offset += s->channel[c].subframe_len[i];
745 }
746 }
747
748 257 return 0;
749 }
750
751 /**
752 *@brief Calculate a decorrelation matrix from the bitstream parameters.
753 *@param s codec context
754 *@param chgroup channel group for which the matrix needs to be calculated
755 */
756 79 static void decode_decorrelation_matrix(WMAProDecodeCtx *s,
757 WMAProChannelGrp *chgroup)
758 {
759 int i;
760 79 int offset = 0;
761 int8_t rotation_offset[WMAPRO_MAX_CHANNELS * WMAPRO_MAX_CHANNELS];
762 79 memset(chgroup->decorrelation_matrix, 0, s->nb_channels *
763 79 s->nb_channels * sizeof(*chgroup->decorrelation_matrix));
764
765
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316 for (i = 0; i < chgroup->num_channels * (chgroup->num_channels - 1) >> 1; i++)
766 237 rotation_offset[i] = get_bits(&s->gb, 6);
767
768
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316 for (i = 0; i < chgroup->num_channels; i++)
769 237 chgroup->decorrelation_matrix[chgroup->num_channels * i + i] =
770
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237 get_bits1(&s->gb) ? 1.0 : -1.0;
771
772
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237 for (i = 1; i < chgroup->num_channels; i++) {
773 int x;
774
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395 for (x = 0; x < i; x++) {
775 int y;
776
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869 for (y = 0; y < i + 1; y++) {
777 632 float v1 = chgroup->decorrelation_matrix[x * chgroup->num_channels + y];
778 632 float v2 = chgroup->decorrelation_matrix[i * chgroup->num_channels + y];
779 632 int n = rotation_offset[offset + x];
780 float sinv;
781 float cosv;
782
783
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632 if (n < 32) {
784 442 sinv = sin64[n];
785 442 cosv = sin64[32 - n];
786 } else {
787 190 sinv = sin64[64 - n];
788 190 cosv = -sin64[n - 32];
789 }
790
791 632 chgroup->decorrelation_matrix[y + x * chgroup->num_channels] =
792 632 (v1 * sinv) - (v2 * cosv);
793 632 chgroup->decorrelation_matrix[y + i * chgroup->num_channels] =
794 632 (v1 * cosv) + (v2 * sinv);
795 }
796 }
797 158 offset += i;
798 }
799 79 }
800
801 /**
802 *@brief Decode channel transformation parameters
803 *@param s codec context
804 *@return >= 0 in case of success, < 0 in case of bitstream errors
805 */
806 527 static int decode_channel_transform(WMAProDecodeCtx* s)
807 {
808 int i;
809 /* should never consume more than 1921 bits for the 8 channel case
810 * 1 + MAX_CHANNELS * (MAX_CHANNELS + 2 + 3 * MAX_CHANNELS * MAX_CHANNELS
811 * + MAX_CHANNELS + MAX_BANDS + 1)
812 */
813
814 /** in the one channel case channel transforms are pointless */
815 527 s->num_chgroups = 0;
816
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527 if (s->nb_channels > 1) {
817 527 int remaining_channels = s->channels_for_cur_subframe;
818
819
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527 if (get_bits1(&s->gb)) {
820 avpriv_request_sample(s->avctx,
821 "Channel transform bit");
822 return AVERROR_PATCHWELCOME;
823 }
824
825
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1156 for (s->num_chgroups = 0; remaining_channels &&
826
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629 s->num_chgroups < s->channels_for_cur_subframe; s->num_chgroups++) {
827 629 WMAProChannelGrp* chgroup = &s->chgroup[s->num_chgroups];
828 629 float** channel_data = chgroup->channel_data;
829 629 chgroup->num_channels = 0;
830 629 chgroup->transform = 0;
831
832 /** decode channel mask */
833
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629 if (remaining_channels > 2) {
834
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1217 for (i = 0; i < s->channels_for_cur_subframe; i++) {
835 1035 int channel_idx = s->channel_indexes_for_cur_subframe[i];
836
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1035 if (!s->channel[channel_idx].grouped
837
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819 && get_bits1(&s->gb)) {
838 536 ++chgroup->num_channels;
839 536 s->channel[channel_idx].grouped = 1;
840 536 *channel_data++ = s->channel[channel_idx].coeffs;
841 }
842 }
843 } else {
844 447 chgroup->num_channels = remaining_channels;
845
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1222 for (i = 0; i < s->channels_for_cur_subframe; i++) {
846 775 int channel_idx = s->channel_indexes_for_cur_subframe[i];
847
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775 if (!s->channel[channel_idx].grouped)
848 698 *channel_data++ = s->channel[channel_idx].coeffs;
849 775 s->channel[channel_idx].grouped = 1;
850 }
851 }
852
853 /** decode transform type */
854
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629 if (chgroup->num_channels == 2) {
855
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276 if (get_bits1(&s->gb)) {
856
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38 if (get_bits1(&s->gb)) {
857 avpriv_request_sample(s->avctx,
858 "Unknown channel transform type");
859 return AVERROR_PATCHWELCOME;
860 }
861 } else {
862 238 chgroup->transform = 1;
863
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238 if (s->nb_channels == 2) {
864 215 chgroup->decorrelation_matrix[0] = 1.0;
865 215 chgroup->decorrelation_matrix[1] = -1.0;
866 215 chgroup->decorrelation_matrix[2] = 1.0;
867 215 chgroup->decorrelation_matrix[3] = 1.0;
868 } else {
869 /** cos(pi/4) */
870 23 chgroup->decorrelation_matrix[0] = 0.70703125;
871 23 chgroup->decorrelation_matrix[1] = -0.70703125;
872 23 chgroup->decorrelation_matrix[2] = 0.70703125;
873 23 chgroup->decorrelation_matrix[3] = 0.70703125;
874 }
875 }
876
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353 } else if (chgroup->num_channels > 2) {
877
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157 if (get_bits1(&s->gb)) {
878 79 chgroup->transform = 1;
879
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79 if (get_bits1(&s->gb)) {
880 79 decode_decorrelation_matrix(s, chgroup);
881 } else {
882 /** FIXME: more than 6 coupled channels not supported */
883 if (chgroup->num_channels > 6) {
884 avpriv_request_sample(s->avctx,
885 "Coupled channels > 6");
886 } else {
887 memcpy(chgroup->decorrelation_matrix,
888 default_decorrelation[chgroup->num_channels],
889 chgroup->num_channels * chgroup->num_channels *
890 sizeof(*chgroup->decorrelation_matrix));
891 }
892 }
893 }
894 }
895
896 /** decode transform on / off */
897
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629 if (chgroup->transform) {
898
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317 if (!get_bits1(&s->gb)) {
899 int i;
900 /** transform can be enabled for individual bands */
901 for (i = 0; i < s->num_bands; i++) {
902 chgroup->transform_band[i] = get_bits1(&s->gb);
903 }
904 } else {
905 317 memset(chgroup->transform_band, 1, s->num_bands);
906 }
907 }
908 629 remaining_channels -= chgroup->num_channels;
909 }
910 }
911 527 return 0;
912 }
913
914 /**
915 *@brief Extract the coefficients from the bitstream.
916 *@param s codec context
917 *@param c current channel number
918 *@return 0 on success, < 0 in case of bitstream errors
919 */
920 1038 static int decode_coeffs(WMAProDecodeCtx *s, int c)
921 {
922 /* Integers 0..15 as single-precision floats. The table saves a
923 costly int to float conversion, and storing the values as
924 integers allows fast sign-flipping. */
925 static const uint32_t fval_tab[16] = {
926 0x00000000, 0x3f800000, 0x40000000, 0x40400000,
927 0x40800000, 0x40a00000, 0x40c00000, 0x40e00000,
928 0x41000000, 0x41100000, 0x41200000, 0x41300000,
929 0x41400000, 0x41500000, 0x41600000, 0x41700000,
930 };
931 int vlctable;
932 VLC* vlc;
933 1038 WMAProChannelCtx* ci = &s->channel[c];
934 1038 int rl_mode = 0;
935 1038 int cur_coeff = 0;
936 1038 int num_zeros = 0;
937 const uint16_t* run;
938 const float* level;
939
940 ff_dlog(s->avctx, "decode coefficients for channel %i\n", c);
941
942 1038 vlctable = get_bits1(&s->gb);
943 1038 vlc = &coef_vlc[vlctable];
944
945
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1038 if (vlctable) {
946 321 run = coef1_run;
947 321 level = coef1_level;
948 } else {
949 717 run = coef0_run;
950 717 level = coef0_level;
951 }
952
953 /** decode vector coefficients (consumes up to 167 bits per iteration for
954 4 vector coded large values) */
955
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39251 while ((s->transmit_num_vec_coeffs || !rl_mode) &&
956
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38213 (cur_coeff + 3 < ci->num_vec_coeffs)) {
957 uint32_t vals[4];
958 int i;
959 unsigned int idx;
960
961 38213 idx = get_vlc2(&s->gb, vec4_vlc.table, VLCBITS, VEC4MAXDEPTH);
962
963
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38213 if ((int)idx < 0) {
964
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65430 for (i = 0; i < 4; i += 2) {
965 43620 idx = get_vlc2(&s->gb, vec2_vlc.table, VLCBITS, VEC2MAXDEPTH);
966
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43620 if ((int)idx < 0) {
967 uint32_t v0, v1;
968 20544 v0 = get_vlc2(&s->gb, vec1_vlc.table, VLCBITS, VEC1MAXDEPTH);
969
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20544 if (v0 == HUFF_VEC1_SIZE - 1)
970 1608 v0 += ff_wma_get_large_val(&s->gb);
971 20544 v1 = get_vlc2(&s->gb, vec1_vlc.table, VLCBITS, VEC1MAXDEPTH);
972
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20544 if (v1 == HUFF_VEC1_SIZE - 1)
973 1665 v1 += ff_wma_get_large_val(&s->gb);
974 20544 vals[i ] = av_float2int(v0);
975 20544 vals[i+1] = av_float2int(v1);
976 } else {
977 23076 vals[i] = fval_tab[idx >> 4 ];
978 23076 vals[i+1] = fval_tab[idx & 0xF];
979 }
980 }
981 } else {
982 16403 vals[0] = fval_tab[ idx >> 12 ];
983 16403 vals[1] = fval_tab[(idx >> 8) & 0xF];
984 16403 vals[2] = fval_tab[(idx >> 4) & 0xF];
985 16403 vals[3] = fval_tab[ idx & 0xF];
986 }
987
988 /** decode sign */
989
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191065 for (i = 0; i < 4; i++) {
990
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152852 if (vals[i]) {
991 111800 uint32_t sign = get_bits1(&s->gb) - 1;
992 111800 AV_WN32A(&ci->coeffs[cur_coeff], vals[i] ^ sign << 31);
993 111800 num_zeros = 0;
994 } else {
995 41052 ci->coeffs[cur_coeff] = 0;
996 /** switch to run level mode when subframe_len / 128 zeros
997 were found in a row */
998 41052 rl_mode |= (++num_zeros > s->subframe_len >> 8);
999 }
1000 152852 ++cur_coeff;
1001 }
1002 }
1003
1004 /** decode run level coded coefficients */
1005
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1038 if (cur_coeff < s->subframe_len) {
1006 int ret;
1007
1008 1038 memset(&ci->coeffs[cur_coeff], 0,
1009 1038 sizeof(*ci->coeffs) * (s->subframe_len - cur_coeff));
1010 1038 ret = ff_wma_run_level_decode(s->avctx, &s->gb, vlc,
1011 1038 level, run, 1, ci->coeffs,
1012 1038 cur_coeff, s->subframe_len,
1013 1038 s->subframe_len, s->esc_len, 0);
1014
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1038 if (ret < 0)
1015 return ret;
1016 }
1017
1018 1038 return 0;
1019 }
1020
1021 /**
1022 *@brief Extract scale factors from the bitstream.
1023 *@param s codec context
1024 *@return 0 on success, < 0 in case of bitstream errors
1025 */
1026 521 static int decode_scale_factors(WMAProDecodeCtx* s)
1027 {
1028 int i;
1029
1030 /** should never consume more than 5344 bits
1031 * MAX_CHANNELS * (1 + MAX_BANDS * 23)
1032 */
1033
1034
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1745 for (i = 0; i < s->channels_for_cur_subframe; i++) {
1035 1224 int c = s->channel_indexes_for_cur_subframe[i];
1036 int* sf;
1037 int* sf_end;
1038 1224 s->channel[c].scale_factors = s->channel[c].saved_scale_factors[!s->channel[c].scale_factor_idx];
1039 1224 sf_end = s->channel[c].scale_factors + s->num_bands;
1040
1041 /** resample scale factors for the new block size
1042 * as the scale factors might need to be resampled several times
1043 * before some new values are transmitted, a backup of the last
1044 * transmitted scale factors is kept in saved_scale_factors
1045 */
1046
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1224 if (s->channel[c].reuse_sf) {
1047 298 const int8_t* sf_offsets = s->sf_offsets[s->table_idx][s->channel[c].table_idx];
1048 int b;
1049
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5471 for (b = 0; b < s->num_bands; b++)
1050 5173 s->channel[c].scale_factors[b] =
1051 5173 s->channel[c].saved_scale_factors[s->channel[c].scale_factor_idx][*sf_offsets++];
1052 }
1053
1054
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1224 if (!s->channel[c].cur_subframe || get_bits1(&s->gb)) {
1055
1056
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1206 if (!s->channel[c].reuse_sf) {
1057 int val;
1058 /** decode DPCM coded scale factors */
1059 926 s->channel[c].scale_factor_step = get_bits(&s->gb, 2) + 1;
1060 926 val = 45 / s->channel[c].scale_factor_step;
1061
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24757 for (sf = s->channel[c].scale_factors; sf < sf_end; sf++) {
1062 23831 val += get_vlc2(&s->gb, sf_vlc.table, SCALEVLCBITS, SCALEMAXDEPTH);
1063 23831 *sf = val;
1064 }
1065 } else {
1066 int i;
1067 /** run level decode differences to the resampled factors */
1068
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1904 for (i = 0; i < s->num_bands; i++) {
1069 int idx;
1070 int skip;
1071 int val;
1072 int sign;
1073
1074 1904 idx = get_vlc2(&s->gb, sf_rl_vlc.table, VLCBITS, SCALERLMAXDEPTH);
1075
1076
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1904 if (!idx) {
1077 41 uint32_t code = get_bits(&s->gb, 14);
1078 41 val = code >> 6;
1079 41 sign = (code & 1) - 1;
1080 41 skip = (code & 0x3f) >> 1;
1081
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1863 } else if (idx == 1) {
1082 280 break;
1083 } else {
1084 1583 skip = scale_rl_run[idx];
1085 1583 val = scale_rl_level[idx];
1086 1583 sign = get_bits1(&s->gb)-1;
1087 }
1088
1089 1624 i += skip;
1090
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1624 if (i >= s->num_bands) {
1091 av_log(s->avctx, AV_LOG_ERROR,
1092 "invalid scale factor coding\n");
1093 return AVERROR_INVALIDDATA;
1094 }
1095 1624 s->channel[c].scale_factors[i] += (val ^ sign) - sign;
1096 }
1097 }
1098 /** swap buffers */
1099 1206 s->channel[c].scale_factor_idx = !s->channel[c].scale_factor_idx;
1100 1206 s->channel[c].table_idx = s->table_idx;
1101 1206 s->channel[c].reuse_sf = 1;
1102 }
1103
1104 /** calculate new scale factor maximum */
1105 1224 s->channel[c].max_scale_factor = s->channel[c].scale_factors[0];
1106
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29004 for (sf = s->channel[c].scale_factors + 1; sf < sf_end; sf++) {
1107 27780 s->channel[c].max_scale_factor =
1108 27780 FFMAX(s->channel[c].max_scale_factor, *sf);
1109 }
1110
1111 }
1112 521 return 0;
1113 }
1114
1115 /**
1116 *@brief Reconstruct the individual channel data.
1117 *@param s codec context
1118 */
1119 521 static void inverse_channel_transform(WMAProDecodeCtx *s)
1120 {
1121 int i;
1122
1123
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1144 for (i = 0; i < s->num_chgroups; i++) {
1124
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623 if (s->chgroup[i].transform) {
1125 float data[WMAPRO_MAX_CHANNELS];
1126 317 const int num_channels = s->chgroup[i].num_channels;
1127 317 float** ch_data = s->chgroup[i].channel_data;
1128 317 float** ch_end = ch_data + num_channels;
1129 317 const int8_t* tb = s->chgroup[i].transform_band;
1130 int16_t* sfb;
1131
1132 /** multichannel decorrelation */
1133 317 for (sfb = s->cur_sfb_offsets;
1134
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8013 sfb < s->cur_sfb_offsets + s->num_bands; sfb++) {
1135 int y;
1136
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7696 if (*tb++ == 1) {
1137 /** multiply values with the decorrelation_matrix */
1138
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530064 for (y = sfb[0]; y < FFMIN(sfb[1], s->subframe_len); y++) {
1139 522368 const float* mat = s->chgroup[i].decorrelation_matrix;
1140 522368 const float* data_end = data + num_channels;
1141 522368 float* data_ptr = data;
1142 float** ch;
1143
1144
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1728896 for (ch = ch_data; ch < ch_end; ch++)
1145 1206528 *data_ptr++ = (*ch)[y];
1146
1147
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1728896 for (ch = ch_data; ch < ch_end; ch++) {
1148 1206528 float sum = 0;
1149 1206528 data_ptr = data;
1150
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4104960 while (data_ptr < data_end)
1151 2898432 sum += *data_ptr++ * *mat++;
1152
1153 1206528 (*ch)[y] = sum;
1154 }
1155 }
1156 } else if (s->nb_channels == 2) {
1157 int len = FFMIN(sfb[1], s->subframe_len) - sfb[0];
1158 s->fdsp->vector_fmul_scalar(ch_data[0] + sfb[0],
1159 ch_data[0] + sfb[0],
1160 181.0 / 128, len);
1161 s->fdsp->vector_fmul_scalar(ch_data[1] + sfb[0],
1162 ch_data[1] + sfb[0],
1163 181.0 / 128, len);
1164 }
1165 }
1166 }
1167 }
1168 521 }
1169
1170 /**
1171 *@brief Apply sine window and reconstruct the output buffer.
1172 *@param s codec context
1173 */
1174 527 static void wmapro_window(WMAProDecodeCtx *s)
1175 {
1176 int i;
1177
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1761 for (i = 0; i < s->channels_for_cur_subframe; i++) {
1178 1234 int c = s->channel_indexes_for_cur_subframe[i];
1179 const float* window;
1180 1234 int winlen = s->channel[c].prev_block_len;
1181 1234 float* start = s->channel[c].coeffs - (winlen >> 1);
1182
1183
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1234 if (s->subframe_len < winlen) {
1184 142 start += (winlen - s->subframe_len) >> 1;
1185 142 winlen = s->subframe_len;
1186 }
1187
1188 1234 window = s->windows[av_log2(winlen) - WMAPRO_BLOCK_MIN_BITS];
1189
1190 1234 winlen >>= 1;
1191
1192 1234 s->fdsp->vector_fmul_window(start, start, start + winlen,
1193 window, winlen);
1194
1195 1234 s->channel[c].prev_block_len = s->subframe_len;
1196 }
1197 527 }
1198
1199 /**
1200 *@brief Decode a single subframe (block).
1201 *@param s codec context
1202 *@return 0 on success, < 0 when decoding failed
1203 */
1204 527 static int decode_subframe(WMAProDecodeCtx *s)
1205 {
1206 527 int offset = s->samples_per_frame;
1207 527 int subframe_len = s->samples_per_frame;
1208 int i;
1209 527 int total_samples = s->samples_per_frame * s->nb_channels;
1210 527 int transmit_coeffs = 0;
1211 int cur_subwoofer_cutoff;
1212
1213 527 s->subframe_offset = get_bits_count(&s->gb);
1214
1215 /** reset channel context and find the next block offset and size
1216 == the next block of the channel with the smallest number of
1217 decoded samples
1218 */
1219
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2813 for (i = 0; i < s->nb_channels; i++) {
1220 2286 s->channel[i].grouped = 0;
1221
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2286 if (offset > s->channel[i].decoded_samples) {
1222 539 offset = s->channel[i].decoded_samples;
1223 539 subframe_len =
1224 539 s->channel[i].subframe_len[s->channel[i].cur_subframe];
1225 }
1226 }
1227
1228 ff_dlog(s->avctx,
1229 "processing subframe with offset %i len %i\n", offset, subframe_len);
1230
1231 /** get a list of all channels that contain the estimated block */
1232 527 s->channels_for_cur_subframe = 0;
1233
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2813 for (i = 0; i < s->nb_channels; i++) {
1234 2286 const int cur_subframe = s->channel[i].cur_subframe;
1235 /** subtract already processed samples */
1236 2286 total_samples -= s->channel[i].decoded_samples;
1237
1238 /** and count if there are multiple subframes that match our profile */
1239
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2286 if (offset == s->channel[i].decoded_samples &&
1240
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1277 subframe_len == s->channel[i].subframe_len[cur_subframe]) {
1241 1234 total_samples -= s->channel[i].subframe_len[cur_subframe];
1242 1234 s->channel[i].decoded_samples +=
1243 1234 s->channel[i].subframe_len[cur_subframe];
1244 1234 s->channel_indexes_for_cur_subframe[s->channels_for_cur_subframe] = i;
1245 1234 ++s->channels_for_cur_subframe;
1246 }
1247 }
1248
1249 /** check if the frame will be complete after processing the
1250 estimated block */
1251
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527 if (!total_samples)
1252 257 s->parsed_all_subframes = 1;
1253
1254
1255 ff_dlog(s->avctx, "subframe is part of %i channels\n",
1256 s->channels_for_cur_subframe);
1257
1258 /** calculate number of scale factor bands and their offsets */
1259 527 s->table_idx = av_log2(s->samples_per_frame/subframe_len);
1260 527 s->num_bands = s->num_sfb[s->table_idx];
1261 527 s->cur_sfb_offsets = s->sfb_offsets[s->table_idx];
1262 527 cur_subwoofer_cutoff = s->subwoofer_cutoffs[s->table_idx];
1263
1264 /** configure the decoder for the current subframe */
1265 527 offset += s->samples_per_frame >> 1;
1266
1267
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1761 for (i = 0; i < s->channels_for_cur_subframe; i++) {
1268 1234 int c = s->channel_indexes_for_cur_subframe[i];
1269
1270 1234 s->channel[c].coeffs = &s->channel[c].out[offset];
1271 }
1272
1273 527 s->subframe_len = subframe_len;
1274 527 s->esc_len = av_log2(s->subframe_len - 1) + 1;
1275
1276 /** skip extended header if any */
1277
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527 if (get_bits1(&s->gb)) {
1278 int num_fill_bits;
1279
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158 if (!(num_fill_bits = get_bits(&s->gb, 2))) {
1280 158 int len = get_bits(&s->gb, 4);
1281 158 num_fill_bits = get_bitsz(&s->gb, len) + 1;
1282 }
1283
1284
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158 if (num_fill_bits >= 0) {
1285
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158 if (get_bits_count(&s->gb) + num_fill_bits > s->num_saved_bits) {
1286 av_log(s->avctx, AV_LOG_ERROR, "invalid number of fill bits\n");
1287 return AVERROR_INVALIDDATA;
1288 }
1289
1290 158 skip_bits_long(&s->gb, num_fill_bits);
1291 }
1292 }
1293
1294 /** no idea for what the following bit is used */
1295
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527 if (get_bits1(&s->gb)) {
1296 avpriv_request_sample(s->avctx, "Reserved bit");
1297 return AVERROR_PATCHWELCOME;
1298 }
1299
1300
1301
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527 if (decode_channel_transform(s) < 0)
1302 return AVERROR_INVALIDDATA;
1303
1304
1305
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1761 for (i = 0; i < s->channels_for_cur_subframe; i++) {
1306 1234 int c = s->channel_indexes_for_cur_subframe[i];
1307
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1234 if ((s->channel[c].transmit_coefs = get_bits1(&s->gb)))
1308 1038 transmit_coeffs = 1;
1309 }
1310
1311
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527 av_assert0(s->subframe_len <= WMAPRO_BLOCK_MAX_SIZE);
1312
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527 if (transmit_coeffs) {
1313 int step;
1314 521 int quant_step = 90 * s->bits_per_sample >> 4;
1315
1316 /** decode number of vector coded coefficients */
1317
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521 if ((s->transmit_num_vec_coeffs = get_bits1(&s->gb))) {
1318 int num_bits = av_log2((s->subframe_len + 3)/4) + 1;
1319 for (i = 0; i < s->channels_for_cur_subframe; i++) {
1320 int c = s->channel_indexes_for_cur_subframe[i];
1321 int num_vec_coeffs = get_bits(&s->gb, num_bits) << 2;
1322 if (num_vec_coeffs > s->subframe_len) {
1323 av_log(s->avctx, AV_LOG_ERROR, "num_vec_coeffs %d is too large\n", num_vec_coeffs);
1324 return AVERROR_INVALIDDATA;
1325 }
1326 av_assert0(num_vec_coeffs + offset <= FF_ARRAY_ELEMS(s->channel[c].out));
1327 s->channel[c].num_vec_coeffs = num_vec_coeffs;
1328 }
1329 } else {
1330
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1745 for (i = 0; i < s->channels_for_cur_subframe; i++) {
1331 1224 int c = s->channel_indexes_for_cur_subframe[i];
1332 1224 s->channel[c].num_vec_coeffs = s->subframe_len;
1333 }
1334 }
1335 /** decode quantization step */
1336 521 step = get_sbits(&s->gb, 6);
1337 521 quant_step += step;
1338
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521 if (step == -32 || step == 31) {
1339
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23 const int sign = (step == 31) - 1;
1340 23 int quant = 0;
1341
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23 while (get_bits_count(&s->gb) + 5 < s->num_saved_bits &&
1342
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23 (step = get_bits(&s->gb, 5)) == 31) {
1343 quant += 31;
1344 }
1345 23 quant_step += ((quant + step) ^ sign) - sign;
1346 }
1347
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521 if (quant_step < 0) {
1348 av_log(s->avctx, AV_LOG_DEBUG, "negative quant step\n");
1349 }
1350
1351 /** decode quantization step modifiers for every channel */
1352
1353
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521 if (s->channels_for_cur_subframe == 1) {
1354 194 s->channel[s->channel_indexes_for_cur_subframe[0]].quant_step = quant_step;
1355 } else {
1356 327 int modifier_len = get_bits(&s->gb, 3);
1357
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1357 for (i = 0; i < s->channels_for_cur_subframe; i++) {
1358 1030 int c = s->channel_indexes_for_cur_subframe[i];
1359 1030 s->channel[c].quant_step = quant_step;
1360
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1030 if (get_bits1(&s->gb)) {
1361
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511 if (modifier_len) {
1362 458 s->channel[c].quant_step += get_bits(&s->gb, modifier_len) + 1;
1363 } else
1364 53 ++s->channel[c].quant_step;
1365 }
1366 }
1367 }
1368
1369 /** decode scale factors */
1370
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521 if (decode_scale_factors(s) < 0)
1371 return AVERROR_INVALIDDATA;
1372 }
1373
1374 ff_dlog(s->avctx, "BITSTREAM: subframe header length was %i\n",
1375 get_bits_count(&s->gb) - s->subframe_offset);
1376
1377 /** parse coefficients */
1378
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1761 for (i = 0; i < s->channels_for_cur_subframe; i++) {
1379 1234 int c = s->channel_indexes_for_cur_subframe[i];
1380
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1234 if (s->channel[c].transmit_coefs &&
1381
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1038 get_bits_count(&s->gb) < s->num_saved_bits) {
1382 1038 decode_coeffs(s, c);
1383 } else
1384 196 memset(s->channel[c].coeffs, 0,
1385 sizeof(*s->channel[c].coeffs) * subframe_len);
1386 }
1387
1388 ff_dlog(s->avctx, "BITSTREAM: subframe length was %i\n",
1389 get_bits_count(&s->gb) - s->subframe_offset);
1390
1391
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527 if (transmit_coeffs) {
1392 521 AVTXContext *tx = s->tx[av_log2(subframe_len) - WMAPRO_BLOCK_MIN_BITS];
1393 521 av_tx_fn tx_fn = s->tx_fn[av_log2(subframe_len) - WMAPRO_BLOCK_MIN_BITS];
1394 /** reconstruct the per channel data */
1395 521 inverse_channel_transform(s);
1396
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1745 for (i = 0; i < s->channels_for_cur_subframe; i++) {
1397 1224 int c = s->channel_indexes_for_cur_subframe[i];
1398 1224 const int* sf = s->channel[c].scale_factors;
1399 int b;
1400
1401
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1224 if (c == s->lfe_channel)
1402 103 memset(&s->tmp[cur_subwoofer_cutoff], 0, sizeof(*s->tmp) *
1403 103 (subframe_len - cur_subwoofer_cutoff));
1404
1405 /** inverse quantization and rescaling */
1406
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30228 for (b = 0; b < s->num_bands; b++) {
1407 29004 const int end = FFMIN(s->cur_sfb_offsets[b+1], s->subframe_len);
1408 29004 const int exp = s->channel[c].quant_step -
1409 29004 (s->channel[c].max_scale_factor - *sf++) *
1410 29004 s->channel[c].scale_factor_step;
1411 29004 const float quant = ff_exp10(exp / 20.0);
1412 29004 int start = s->cur_sfb_offsets[b];
1413 29004 s->fdsp->vector_fmul_scalar(s->tmp + start,
1414 29004 s->channel[c].coeffs + start,
1415 quant, end - start);
1416 }
1417
1418 /** apply imdct (imdct_half == DCTIV with reverse) */
1419 1224 tx_fn(tx, s->channel[c].coeffs, s->tmp, sizeof(float));
1420 }
1421 }
1422
1423 /** window and overlapp-add */
1424 527 wmapro_window(s);
1425
1426 /** handled one subframe */
1427
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1761 for (i = 0; i < s->channels_for_cur_subframe; i++) {
1428 1234 int c = s->channel_indexes_for_cur_subframe[i];
1429
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1234 if (s->channel[c].cur_subframe >= s->channel[c].num_subframes) {
1430 av_log(s->avctx, AV_LOG_ERROR, "broken subframe\n");
1431 return AVERROR_INVALIDDATA;
1432 }
1433 1234 ++s->channel[c].cur_subframe;
1434 }
1435
1436 527 return 0;
1437 }
1438
1439 /**
1440 *@brief Decode one WMA frame.
1441 *@param s codec context
1442 *@return 0 if the trailer bit indicates that this is the last frame,
1443 * 1 if there are additional frames
1444 */
1445 257 static int decode_frame(WMAProDecodeCtx *s, AVFrame *frame, int *got_frame_ptr)
1446 {
1447 257 GetBitContext* gb = &s->gb;
1448 257 int more_frames = 0;
1449 257 int len = 0;
1450 int i;
1451
1452 /** get frame length */
1453
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257 if (s->len_prefix)
1454 257 len = get_bits(gb, s->log2_frame_size);
1455
1456 ff_dlog(s->avctx, "decoding frame with length %x\n", len);
1457
1458 /** decode tile information */
1459
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257 if (decode_tilehdr(s)) {
1460 s->packet_loss = 1;
1461 return 0;
1462 }
1463
1464 /** read postproc transform */
1465
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257 if (s->nb_channels > 1 && get_bits1(gb)) {
1466 if (get_bits1(gb)) {
1467 for (i = 0; i < s->nb_channels * s->nb_channels; i++)
1468 skip_bits(gb, 4);
1469 }
1470 }
1471
1472 /** read drc info */
1473
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257 if (s->dynamic_range_compression) {
1474 257 s->drc_gain = get_bits(gb, 8);
1475 ff_dlog(s->avctx, "drc_gain %i\n", s->drc_gain);
1476 }
1477
1478
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257 if (get_bits1(gb)) {
1479
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4 if (get_bits1(gb))
1480 3 s->trim_start = get_bits(gb, av_log2(s->samples_per_frame * 2));
1481
1482
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4 if (get_bits1(gb))
1483 1 s->trim_end = get_bits(gb, av_log2(s->samples_per_frame * 2));
1484 } else {
1485 253 s->trim_start = s->trim_end = 0;
1486 }
1487
1488 ff_dlog(s->avctx, "BITSTREAM: frame header length was %i\n",
1489 get_bits_count(gb) - s->frame_offset);
1490
1491 /** reset subframe states */
1492 257 s->parsed_all_subframes = 0;
1493
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1183 for (i = 0; i < s->nb_channels; i++) {
1494 926 s->channel[i].decoded_samples = 0;
1495 926 s->channel[i].cur_subframe = 0;
1496 926 s->channel[i].reuse_sf = 0;
1497 }
1498
1499 /** decode all subframes */
1500
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784 while (!s->parsed_all_subframes) {
1501
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527 if (decode_subframe(s) < 0) {
1502 s->packet_loss = 1;
1503 return 0;
1504 }
1505 }
1506
1507 /** copy samples to the output buffer */
1508
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1183 for (i = 0; i < s->nb_channels; i++)
1509 926 memcpy(frame->extended_data[i], s->channel[i].out,
1510 926 s->samples_per_frame * sizeof(*s->channel[i].out));
1511
1512
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1183 for (i = 0; i < s->nb_channels; i++) {
1513 /** reuse second half of the IMDCT output for the next frame */
1514 926 memcpy(&s->channel[i].out[0],
1515 926 &s->channel[i].out[s->samples_per_frame],
1516 926 s->samples_per_frame * sizeof(*s->channel[i].out) >> 1);
1517 }
1518
1519
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257 if (s->skip_frame) {
1520 3 s->skip_frame = 0;
1521 3 *got_frame_ptr = 0;
1522 3 av_frame_unref(frame);
1523 } else {
1524 254 *got_frame_ptr = 1;
1525 }
1526
1527
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257 if (s->len_prefix) {
1528
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257 if (len != (get_bits_count(gb) - s->frame_offset) + 2) {
1529 /** FIXME: not sure if this is always an error */
1530 av_log(s->avctx, AV_LOG_ERROR,
1531 "frame[%"PRIu32"] would have to skip %i bits\n",
1532 s->frame_num,
1533 len - (get_bits_count(gb) - s->frame_offset) - 1);
1534 s->packet_loss = 1;
1535 return 0;
1536 }
1537
1538 /** skip the rest of the frame data */
1539 257 skip_bits_long(gb, len - (get_bits_count(gb) - s->frame_offset) - 1);
1540 } else {
1541 while (get_bits_count(gb) < s->num_saved_bits && get_bits1(gb) == 0) {
1542 }
1543 }
1544
1545 /** decode trailer bit */
1546 257 more_frames = get_bits1(gb);
1547
1548 257 ++s->frame_num;
1549 257 return more_frames;
1550 }
1551
1552 /**
1553 *@brief Calculate remaining input buffer length.
1554 *@param s codec context
1555 *@param gb bitstream reader context
1556 *@return remaining size in bits
1557 */
1558 849 static int remaining_bits(WMAProDecodeCtx *s, GetBitContext *gb)
1559 {
1560 849 return s->buf_bit_size - get_bits_count(gb);
1561 }
1562
1563 /**
1564 *@brief Fill the bit reservoir with a (partial) frame.
1565 *@param s codec context
1566 *@param gb bitstream reader context
1567 *@param len length of the partial frame
1568 *@param append decides whether to reset the buffer or not
1569 */
1570 281 static void save_bits(WMAProDecodeCtx *s, GetBitContext* gb, int len,
1571 int append)
1572 {
1573 int buflen;
1574
1575 /** when the frame data does not need to be concatenated, the input buffer
1576 is reset and additional bits from the previous frame are copied
1577 and skipped later so that a fast byte copy is possible */
1578
1579
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281 if (!append) {
1580 260 s->frame_offset = get_bits_count(gb) & 7;
1581 260 s->num_saved_bits = s->frame_offset;
1582 260 init_put_bits(&s->pb, s->frame_data, MAX_FRAMESIZE);
1583 260 buflen = (s->num_saved_bits + len + 7) >> 3;
1584 } else
1585 21 buflen = (put_bits_count(&s->pb) + len + 7) >> 3;
1586
1587
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281 if (len <= 0 || buflen > MAX_FRAMESIZE) {
1588 avpriv_request_sample(s->avctx, "Too small input buffer");
1589 s->packet_loss = 1;
1590 return;
1591 }
1592
1593
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281 av_assert0(len <= put_bits_left(&s->pb));
1594
1595 281 s->num_saved_bits += len;
1596
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281 if (!append) {
1597 260 ff_copy_bits(&s->pb, gb->buffer + (get_bits_count(gb) >> 3),
1598 s->num_saved_bits);
1599 } else {
1600 21 int align = 8 - (get_bits_count(gb) & 7);
1601 21 align = FFMIN(align, len);
1602 21 put_bits(&s->pb, align, get_bits(gb, align));
1603 21 len -= align;
1604 21 ff_copy_bits(&s->pb, gb->buffer + (get_bits_count(gb) >> 3), len);
1605 }
1606 281 skip_bits_long(gb, len);
1607
1608 {
1609 281 PutBitContext tmp = s->pb;
1610 281 flush_put_bits(&tmp);
1611 }
1612
1613 281 init_get_bits(&s->gb, s->frame_data, s->num_saved_bits);
1614 281 skip_bits(&s->gb, s->frame_offset);
1615 }
1616
1617 283 static int decode_packet(AVCodecContext *avctx, WMAProDecodeCtx *s,
1618 AVFrame *frame, int *got_frame_ptr, AVPacket *avpkt)
1619 {
1620 283 GetBitContext* gb = &s->pgb;
1621 283 const uint8_t* buf = avpkt->data;
1622 283 int buf_size = avpkt->size;
1623 int num_bits_prev_frame;
1624 int packet_sequence_number;
1625 int ret;
1626
1627 283 *got_frame_ptr = 0;
1628
1629
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283 if (!buf_size) {
1630 int i;
1631
1632 /** Must output remaining samples after stream end. WMAPRO 5.1 created
1633 * by XWMA encoder don't though (maybe only 1/2ch streams need it). */
1634 s->packet_done = 0;
1635 if (s->eof_done)
1636 return 0;
1637
1638 /** clean output buffer and copy last IMDCT samples */
1639 for (i = 0; i < s->nb_channels; i++) {
1640 memset(frame->extended_data[i], 0,
1641 s->samples_per_frame * sizeof(*s->channel[i].out));
1642
1643 memcpy(frame->extended_data[i], s->channel[i].out,
1644 s->samples_per_frame * sizeof(*s->channel[i].out) >> 1);
1645 }
1646
1647 s->eof_done = 1;
1648 s->packet_done = 1;
1649 *got_frame_ptr = 1;
1650 return 0;
1651 }
1652
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283 else if (s->packet_done || s->packet_loss) {
1653 24 s->packet_done = 0;
1654
1655 /** sanity check for the buffer length */
1656
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24 if (avctx->codec_id == AV_CODEC_ID_WMAPRO && buf_size < avctx->block_align) {
1657 av_log(avctx, AV_LOG_ERROR, "Input packet too small (%d < %d)\n",
1658 buf_size, avctx->block_align);
1659 s->packet_loss = 1;
1660 return AVERROR_INVALIDDATA;
1661 }
1662
1663
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24 if (avctx->codec_id == AV_CODEC_ID_WMAPRO) {
1664 24 s->next_packet_start = buf_size - avctx->block_align;
1665 24 buf_size = avctx->block_align;
1666 } else {
1667 s->next_packet_start = buf_size - FFMIN(buf_size, avctx->block_align);
1668 buf_size = FFMIN(buf_size, avctx->block_align);
1669 }
1670 24 s->buf_bit_size = buf_size << 3;
1671
1672 /** parse packet header */
1673 24 ret = init_get_bits8(gb, buf, buf_size);
1674
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24 if (ret < 0)
1675 return ret;
1676
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24 if (avctx->codec_id != AV_CODEC_ID_XMA2) {
1677 24 packet_sequence_number = get_bits(gb, 4);
1678 24 skip_bits(gb, 2);
1679 } else {
1680 int num_frames = get_bits(gb, 6);
1681 ff_dlog(avctx, "packet[%d]: number of frames %d\n", avctx->frame_number, num_frames);
1682 packet_sequence_number = 0;
1683 }
1684
1685 /** get number of bits that need to be added to the previous frame */
1686 24 num_bits_prev_frame = get_bits(gb, s->log2_frame_size);
1687
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24 if (avctx->codec_id != AV_CODEC_ID_WMAPRO) {
1688 skip_bits(gb, 3);
1689 s->skip_packets = get_bits(gb, 8);
1690 ff_dlog(avctx, "packet[%d]: skip packets %d\n", avctx->frame_number, s->skip_packets);
1691 }
1692
1693 ff_dlog(avctx, "packet[%d]: nbpf %x\n", avctx->frame_number,
1694 num_bits_prev_frame);
1695
1696 /** check for packet loss */
1697
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24 if (avctx->codec_id == AV_CODEC_ID_WMAPRO && !s->packet_loss &&
1698
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21 ((s->packet_sequence_number + 1) & 0xF) != packet_sequence_number) {
1699 s->packet_loss = 1;
1700 av_log(avctx, AV_LOG_ERROR,
1701 "Packet loss detected! seq %"PRIx8" vs %x\n",
1702 s->packet_sequence_number, packet_sequence_number);
1703 }
1704 24 s->packet_sequence_number = packet_sequence_number;
1705
1706
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24 if (num_bits_prev_frame > 0) {
1707 21 int remaining_packet_bits = s->buf_bit_size - get_bits_count(gb);
1708
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21 if (num_bits_prev_frame >= remaining_packet_bits) {
1709 num_bits_prev_frame = remaining_packet_bits;
1710 s->packet_done = 1;
1711 }
1712
1713 /** append the previous frame data to the remaining data from the
1714 previous packet to create a full frame */
1715 21 save_bits(s, gb, num_bits_prev_frame, 1);
1716 ff_dlog(avctx, "accumulated %x bits of frame data\n",
1717 s->num_saved_bits - s->frame_offset);
1718
1719 /** decode the cross packet frame if it is valid */
1720
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21 if (!s->packet_loss)
1721 21 decode_frame(s, frame, got_frame_ptr);
1722 3 } else if (s->num_saved_bits - s->frame_offset) {
1723 ff_dlog(avctx, "ignoring %x previously saved bits\n",
1724 s->num_saved_bits - s->frame_offset);
1725 }
1726
1727
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24 if (s->packet_loss) {
1728 /** reset number of saved bits so that the decoder
1729 does not start to decode incomplete frames in the
1730 s->len_prefix == 0 case */
1731 3 s->num_saved_bits = 0;
1732 3 s->packet_loss = 0;
1733 }
1734 } else {
1735 int frame_size;
1736
1737
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259 if (avpkt->size < s->next_packet_start) {
1738 s->packet_loss = 1;
1739 return AVERROR_INVALIDDATA;
1740 }
1741
1742 259 s->buf_bit_size = (avpkt->size - s->next_packet_start) << 3;
1743 259 ret = init_get_bits8(gb, avpkt->data, avpkt->size - s->next_packet_start);
1744
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259 if (ret < 0)
1745 return ret;
1746 259 skip_bits(gb, s->packet_offset);
1747
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259 if (s->len_prefix && remaining_bits(s, gb) > s->log2_frame_size &&
1748
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518 (frame_size = show_bits(gb, s->log2_frame_size)) &&
1749 259 frame_size <= remaining_bits(s, gb)) {
1750 236 save_bits(s, gb, frame_size, 0);
1751
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236 if (!s->packet_loss)
1752 236 s->packet_done = !decode_frame(s, frame, got_frame_ptr);
1753
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23 } else if (!s->len_prefix
1754 && s->num_saved_bits > get_bits_count(&s->gb)) {
1755 /** when the frames do not have a length prefix, we don't know
1756 the compressed length of the individual frames
1757 however, we know what part of a new packet belongs to the
1758 previous frame
1759 therefore we save the incoming packet first, then we append
1760 the "previous frame" data from the next packet so that
1761 we get a buffer that only contains full frames */
1762 s->packet_done = !decode_frame(s, frame, got_frame_ptr);
1763 } else {
1764 23 s->packet_done = 1;
1765 }
1766 }
1767
1768
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283 if (remaining_bits(s, gb) < 0) {
1769 av_log(avctx, AV_LOG_ERROR, "Overread %d\n", -remaining_bits(s, gb));
1770 s->packet_loss = 1;
1771 }
1772
1773
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307 if (s->packet_done && !s->packet_loss &&
1774 24 remaining_bits(s, gb) > 0) {
1775 /** save the rest of the data so that it can be decoded
1776 with the next packet */
1777 24 save_bits(s, gb, remaining_bits(s, gb), 0);
1778 }
1779
1780 283 s->packet_offset = get_bits_count(gb) & 7;
1781
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283 if (s->packet_loss)
1782 return AVERROR_INVALIDDATA;
1783
1784
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283 if (s->trim_start && avctx->codec_id == AV_CODEC_ID_WMAPRO) {
1785
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3 if (s->trim_start < frame->nb_samples) {
1786 for (int ch = 0; ch < frame->ch_layout.nb_channels; ch++)
1787 frame->extended_data[ch] += s->trim_start * 4;
1788
1789 frame->nb_samples -= s->trim_start;
1790 } else {
1791 3 *got_frame_ptr = 0;
1792 }
1793
1794 3 s->trim_start = 0;
1795 }
1796
1797
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283 if (s->trim_end && avctx->codec_id == AV_CODEC_ID_WMAPRO) {
1798
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1 if (s->trim_end < frame->nb_samples) {
1799 1 frame->nb_samples -= s->trim_end;
1800 } else {
1801 *got_frame_ptr = 0;
1802 }
1803
1804 1 s->trim_end = 0;
1805 }
1806
1807 283 return get_bits_count(gb) >> 3;
1808 }
1809
1810 /**
1811 *@brief Decode a single WMA packet.
1812 *@param avctx codec context
1813 *@param data the output buffer
1814 *@param avpkt input packet
1815 *@return number of bytes that were read from the input buffer
1816 */
1817 283 static int wmapro_decode_packet(AVCodecContext *avctx, AVFrame *frame,
1818 int *got_frame_ptr, AVPacket *avpkt)
1819 {
1820 283 WMAProDecodeCtx *s = avctx->priv_data;
1821 int ret;
1822
1823 /* get output buffer */
1824 283 frame->nb_samples = s->samples_per_frame;
1825
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283 if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) {
1826 s->packet_loss = 1;
1827 return 0;
1828 }
1829
1830 283 return decode_packet(avctx, s, frame, got_frame_ptr, avpkt);
1831 }
1832
1833 static int xma_decode_packet(AVCodecContext *avctx, AVFrame *frame,
1834 int *got_frame_ptr, AVPacket *avpkt)
1835 {
1836 XMADecodeCtx *s = avctx->priv_data;
1837 int got_stream_frame_ptr = 0;
1838 int i, ret = 0, eof = 0;
1839
1840 if (!s->frames[s->current_stream]->data[0]) {
1841 avctx->internal->skip_samples = 64;
1842 s->frames[s->current_stream]->nb_samples = 512;
1843 if ((ret = ff_get_buffer(avctx, s->frames[s->current_stream], 0)) < 0)
1844 return ret;
1845 } else if (s->frames[s->current_stream]->nb_samples != 512) {
1846 avctx->internal->skip_samples = 64;
1847 av_frame_unref(s->frames[s->current_stream]);
1848 s->frames[s->current_stream]->nb_samples = 512;
1849 if ((ret = ff_get_buffer(avctx, s->frames[s->current_stream], 0)) < 0)
1850 return ret;
1851 }
1852 /* decode current stream packet */
1853 if (!s->xma[s->current_stream].eof_done) {
1854 ret = decode_packet(avctx, &s->xma[s->current_stream], s->frames[s->current_stream],
1855 &got_stream_frame_ptr, avpkt);
1856 }
1857
1858 if (!avpkt->size) {
1859 eof = 1;
1860
1861 for (i = 0; i < s->num_streams; i++) {
1862 if (!s->xma[i].eof_done && s->frames[i]->data[0]) {
1863 ret = decode_packet(avctx, &s->xma[i], s->frames[i],
1864 &got_stream_frame_ptr, avpkt);
1865 }
1866
1867 eof &= s->xma[i].eof_done;
1868 }
1869 }
1870
1871 if (s->xma[0].trim_start)
1872 s->trim_start = s->xma[0].trim_start;
1873 if (s->xma[0].trim_end)
1874 s->trim_end = s->xma[0].trim_end;
1875
1876 /* copy stream samples (1/2ch) to sample buffer (Nch) */
1877 if (got_stream_frame_ptr) {
1878 const int nb_samples = s->frames[s->current_stream]->nb_samples;
1879 void *left[1] = { s->frames[s->current_stream]->extended_data[0] };
1880 void *right[1] = { s->frames[s->current_stream]->extended_data[1] };
1881
1882 av_audio_fifo_write(s->samples[0][s->current_stream], left, nb_samples);
1883 if (s->xma[s->current_stream].nb_channels > 1)
1884 av_audio_fifo_write(s->samples[1][s->current_stream], right, nb_samples);
1885 } else if (ret < 0) {
1886 s->current_stream = 0;
1887 return ret;
1888 }
1889
1890 /* find next XMA packet's owner stream, and update.
1891 * XMA streams find their packets following packet_skips
1892 * (at start there is one packet per stream, then interleave non-linearly). */
1893 if (s->xma[s->current_stream].packet_done ||
1894 s->xma[s->current_stream].packet_loss) {
1895 int nb_samples = INT_MAX;
1896
1897 /* select stream with 0 skip_packets (= uses next packet) */
1898 if (s->xma[s->current_stream].skip_packets != 0) {
1899 int min[2];
1900
1901 min[0] = s->xma[0].skip_packets;
1902 min[1] = i = 0;
1903
1904 for (i = 1; i < s->num_streams; i++) {
1905 if (s->xma[i].skip_packets < min[0]) {
1906 min[0] = s->xma[i].skip_packets;
1907 min[1] = i;
1908 }
1909 }
1910
1911 s->current_stream = min[1];
1912 }
1913
1914 /* all other streams skip next packet */
1915 for (i = 0; i < s->num_streams; i++) {
1916 s->xma[i].skip_packets = FFMAX(0, s->xma[i].skip_packets - 1);
1917 nb_samples = FFMIN(nb_samples, av_audio_fifo_size(s->samples[0][i]));
1918 }
1919
1920 if (!eof && avpkt->size)
1921 nb_samples -= FFMIN(nb_samples, 4096);
1922
1923 /* copy samples from buffer to output if possible */
1924 if ((nb_samples > 0 || eof || !avpkt->size) && !s->flushed) {
1925 int bret;
1926
1927 if (eof) {
1928 nb_samples -= av_clip(s->trim_end + s->trim_start - 128 - 64, 0, nb_samples);
1929 s->flushed = 1;
1930 }
1931
1932 frame->nb_samples = nb_samples;
1933 if ((bret = ff_get_buffer(avctx, frame, 0)) < 0)
1934 return bret;
1935
1936 for (i = 0; i < s->num_streams; i++) {
1937 const int start_ch = s->start_channel[i];
1938 void *left[1] = { frame->extended_data[start_ch + 0] };
1939
1940 av_audio_fifo_read(s->samples[0][i], left, nb_samples);
1941 if (s->xma[i].nb_channels > 1) {
1942 void *right[1] = { frame->extended_data[start_ch + 1] };
1943 av_audio_fifo_read(s->samples[1][i], right, nb_samples);
1944 }
1945 }
1946
1947 *got_frame_ptr = nb_samples > 0;
1948 }
1949 }
1950
1951 return ret;
1952 }
1953
1954 static av_cold int xma_decode_init(AVCodecContext *avctx)
1955 {
1956 XMADecodeCtx *s = avctx->priv_data;
1957 int i, ret, start_channels = 0;
1958
1959 if (avctx->ch_layout.nb_channels <= 0 || avctx->extradata_size == 0)
1960 return AVERROR_INVALIDDATA;
1961
1962 /* get stream config */
1963 if (avctx->codec_id == AV_CODEC_ID_XMA2 && avctx->extradata_size == 34) { /* XMA2WAVEFORMATEX */
1964 unsigned int channel_mask = AV_RL32(avctx->extradata + 2);
1965 if (channel_mask) {
1966 av_channel_layout_uninit(&avctx->ch_layout);
1967 av_channel_layout_from_mask(&avctx->ch_layout, channel_mask);
1968 } else
1969 avctx->ch_layout.order = AV_CHANNEL_ORDER_UNSPEC;
1970 s->num_streams = AV_RL16(avctx->extradata);
1971 } else if (avctx->codec_id == AV_CODEC_ID_XMA2 && avctx->extradata_size >= 2) { /* XMA2WAVEFORMAT */
1972 s->num_streams = avctx->extradata[1];
1973 if (avctx->extradata_size != (32 + ((avctx->extradata[0]==3)?0:8) + 4*s->num_streams)) {
1974 av_log(avctx, AV_LOG_ERROR, "Incorrect XMA2 extradata size\n");
1975 s->num_streams = 0;
1976 return AVERROR(EINVAL);
1977 }
1978 } else if (avctx->codec_id == AV_CODEC_ID_XMA1 && avctx->extradata_size >= 4) { /* XMAWAVEFORMAT */
1979 s->num_streams = avctx->extradata[4];
1980 if (avctx->extradata_size != (8 + 20*s->num_streams)) {
1981 av_log(avctx, AV_LOG_ERROR, "Incorrect XMA1 extradata size\n");
1982 s->num_streams = 0;
1983 return AVERROR(EINVAL);
1984 }
1985 } else {
1986 av_log(avctx, AV_LOG_ERROR, "Incorrect XMA config\n");
1987 return AVERROR(EINVAL);
1988 }
1989
1990 /* encoder supports up to 64 streams / 64*2 channels (would have to alloc arrays) */
1991 if (avctx->ch_layout.nb_channels > XMA_MAX_CHANNELS || s->num_streams > XMA_MAX_STREAMS ||
1992 s->num_streams <= 0
1993 ) {
1994 avpriv_request_sample(avctx, "More than %d channels in %d streams", XMA_MAX_CHANNELS, s->num_streams);
1995 s->num_streams = 0;
1996 return AVERROR_PATCHWELCOME;
1997 }
1998
1999 /* init all streams (several streams of 1/2ch make Nch files) */
2000 for (i = 0; i < s->num_streams; i++) {
2001 ret = decode_init(&s->xma[i], avctx, i);
2002 if (ret < 0)
2003 return ret;
2004 s->frames[i] = av_frame_alloc();
2005 if (!s->frames[i])
2006 return AVERROR(ENOMEM);
2007
2008 s->start_channel[i] = start_channels;
2009 start_channels += s->xma[i].nb_channels;
2010 }
2011 if (start_channels != avctx->ch_layout.nb_channels)
2012 return AVERROR_INVALIDDATA;
2013
2014 for (int i = 0; i < XMA_MAX_STREAMS; i++) {
2015 s->samples[0][i] = av_audio_fifo_alloc(avctx->sample_fmt, 1, 64 * 512);
2016 s->samples[1][i] = av_audio_fifo_alloc(avctx->sample_fmt, 1, 64 * 512);
2017 if (!s->samples[0][i] || !s->samples[1][i])
2018 return AVERROR(ENOMEM);
2019 }
2020
2021 return ret;
2022 }
2023
2024 static av_cold int xma_decode_end(AVCodecContext *avctx)
2025 {
2026 XMADecodeCtx *s = avctx->priv_data;
2027 int i;
2028
2029 for (i = 0; i < s->num_streams; i++) {
2030 decode_end(&s->xma[i]);
2031 av_frame_free(&s->frames[i]);
2032 }
2033 s->num_streams = 0;
2034
2035 for (i = 0; i < XMA_MAX_STREAMS; i++) {
2036 av_audio_fifo_free(s->samples[0][i]);
2037 av_audio_fifo_free(s->samples[1][i]);
2038 }
2039
2040 return 0;
2041 }
2042
2043 static void flush(WMAProDecodeCtx *s)
2044 {
2045 int i;
2046 /** reset output buffer as a part of it is used during the windowing of a
2047 new frame */
2048 for (i = 0; i < s->nb_channels; i++)
2049 memset(s->channel[i].out, 0, s->samples_per_frame *
2050 sizeof(*s->channel[i].out));
2051 s->packet_loss = 1;
2052 s->skip_packets = 0;
2053 s->eof_done = 0;
2054 s->skip_frame = 1;
2055 }
2056
2057 /**
2058 *@brief Clear decoder buffers (for seeking).
2059 *@param avctx codec context
2060 */
2061 static void wmapro_flush(AVCodecContext *avctx)
2062 {
2063 WMAProDecodeCtx *s = avctx->priv_data;
2064
2065 flush(s);
2066 }
2067
2068 static void xma_flush(AVCodecContext *avctx)
2069 {
2070 XMADecodeCtx *s = avctx->priv_data;
2071 int i;
2072
2073 for (i = 0; i < XMA_MAX_STREAMS; i++) {
2074 av_audio_fifo_reset(s->samples[0][i]);
2075 av_audio_fifo_reset(s->samples[1][i]);
2076 }
2077
2078 for (i = 0; i < s->num_streams; i++)
2079 flush(&s->xma[i]);
2080
2081 s->current_stream = 0;
2082 s->flushed = 0;
2083 }
2084
2085 /**
2086 *@brief wmapro decoder
2087 */
2088 const FFCodec ff_wmapro_decoder = {
2089 .p.name = "wmapro",
2090 CODEC_LONG_NAME("Windows Media Audio 9 Professional"),
2091 .p.type = AVMEDIA_TYPE_AUDIO,
2092 .p.id = AV_CODEC_ID_WMAPRO,
2093 .priv_data_size = sizeof(WMAProDecodeCtx),
2094 .init = wmapro_decode_init,
2095 .close = wmapro_decode_end,
2096 FF_CODEC_DECODE_CB(wmapro_decode_packet),
2097 .p.capabilities = AV_CODEC_CAP_SUBFRAMES | AV_CODEC_CAP_DR1,
2098 .flush = wmapro_flush,
2099 .p.sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLTP,
2100 AV_SAMPLE_FMT_NONE },
2101 .caps_internal = FF_CODEC_CAP_INIT_CLEANUP,
2102 };
2103
2104 const FFCodec ff_xma1_decoder = {
2105 .p.name = "xma1",
2106 CODEC_LONG_NAME("Xbox Media Audio 1"),
2107 .p.type = AVMEDIA_TYPE_AUDIO,
2108 .p.id = AV_CODEC_ID_XMA1,
2109 .priv_data_size = sizeof(XMADecodeCtx),
2110 .init = xma_decode_init,
2111 .close = xma_decode_end,
2112 FF_CODEC_DECODE_CB(xma_decode_packet),
2113 .p.capabilities = AV_CODEC_CAP_SUBFRAMES | AV_CODEC_CAP_DR1 | AV_CODEC_CAP_DELAY,
2114 .p.sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLTP,
2115 AV_SAMPLE_FMT_NONE },
2116 .caps_internal = FF_CODEC_CAP_INIT_CLEANUP,
2117 };
2118
2119 const FFCodec ff_xma2_decoder = {
2120 .p.name = "xma2",
2121 CODEC_LONG_NAME("Xbox Media Audio 2"),
2122 .p.type = AVMEDIA_TYPE_AUDIO,
2123 .p.id = AV_CODEC_ID_XMA2,
2124 .priv_data_size = sizeof(XMADecodeCtx),
2125 .init = xma_decode_init,
2126 .close = xma_decode_end,
2127 FF_CODEC_DECODE_CB(xma_decode_packet),
2128 .flush = xma_flush,
2129 .p.capabilities = AV_CODEC_CAP_SUBFRAMES | AV_CODEC_CAP_DR1 | AV_CODEC_CAP_DELAY,
2130 .p.sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLTP,
2131 AV_SAMPLE_FMT_NONE },
2132 .caps_internal = FF_CODEC_CAP_INIT_CLEANUP,
2133 };
2134