FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavcodec/atrac1.c
Date: 2021-09-16 08:47:15
Exec Total Coverage
Lines: 125 140 89.3%
Branches: 54 70 77.1%

Line Branch Exec Source
1 /*
2 * ATRAC1 compatible decoder
3 * Copyright (c) 2009 Maxim Poliakovski
4 * Copyright (c) 2009 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 * ATRAC1 compatible decoder.
26 * This decoder handles raw ATRAC1 data and probably SDDS data.
27 */
28
29 /* Many thanks to Tim Craig for all the help! */
30
31 #include <math.h>
32 #include <stddef.h>
33 #include <stdio.h>
34
35 #include "libavutil/float_dsp.h"
36 #include "libavutil/mem_internal.h"
37
38 #include "avcodec.h"
39 #include "get_bits.h"
40 #include "fft.h"
41 #include "internal.h"
42 #include "sinewin.h"
43
44 #include "atrac.h"
45 #include "atrac1data.h"
46
47 #define AT1_MAX_BFU 52 ///< max number of block floating units in a sound unit
48 #define AT1_SU_SIZE 212 ///< number of bytes in a sound unit
49 #define AT1_SU_SAMPLES 512 ///< number of samples in a sound unit
50 #define AT1_FRAME_SIZE AT1_SU_SIZE * 2
51 #define AT1_SU_MAX_BITS AT1_SU_SIZE * 8
52 #define AT1_MAX_CHANNELS 2
53
54 #define AT1_QMF_BANDS 3
55 #define IDX_LOW_BAND 0
56 #define IDX_MID_BAND 1
57 #define IDX_HIGH_BAND 2
58
59 /**
60 * Sound unit struct, one unit is used per channel
61 */
62 typedef struct AT1SUCtx {
63 int log2_block_count[AT1_QMF_BANDS]; ///< log2 number of blocks in a band
64 int num_bfus; ///< number of Block Floating Units
65 float* spectrum[2];
66 DECLARE_ALIGNED(32, float, spec1)[AT1_SU_SAMPLES]; ///< mdct buffer
67 DECLARE_ALIGNED(32, float, spec2)[AT1_SU_SAMPLES]; ///< mdct buffer
68 DECLARE_ALIGNED(32, float, fst_qmf_delay)[46]; ///< delay line for the 1st stacked QMF filter
69 DECLARE_ALIGNED(32, float, snd_qmf_delay)[46]; ///< delay line for the 2nd stacked QMF filter
70 DECLARE_ALIGNED(32, float, last_qmf_delay)[256+39]; ///< delay line for the last stacked QMF filter
71 } AT1SUCtx;
72
73 /**
74 * The atrac1 context, holds all needed parameters for decoding
75 */
76 typedef struct AT1Ctx {
77 AT1SUCtx SUs[AT1_MAX_CHANNELS]; ///< channel sound unit
78 DECLARE_ALIGNED(32, float, spec)[AT1_SU_SAMPLES]; ///< the mdct spectrum buffer
79
80 DECLARE_ALIGNED(32, float, low)[256];
81 DECLARE_ALIGNED(32, float, mid)[256];
82 DECLARE_ALIGNED(32, float, high)[512];
83 float* bands[3];
84 FFTContext mdct_ctx[3];
85 void (*vector_fmul_window)(float *dst, const float *src0,
86 const float *src1, const float *win, int len);
87 } AT1Ctx;
88
89 /** size of the transform in samples in the long mode for each QMF band */
90 static const uint16_t samples_per_band[3] = {128, 128, 256};
91 static const uint8_t mdct_long_nbits[3] = {7, 7, 8};
92
93
94 7157 static void at1_imdct(AT1Ctx *q, float *spec, float *out, int nbits,
95 int rev_spec)
96 {
97 7157 FFTContext* mdct_context = &q->mdct_ctx[nbits - 5 - (nbits > 6)];
98 7157 int transf_size = 1 << nbits;
99
100
2/2
✓ Branch 0 taken 4776 times.
✓ Branch 1 taken 2381 times.
7157 if (rev_spec) {
101 int i;
102
2/2
✓ Branch 0 taken 454272 times.
✓ Branch 1 taken 4776 times.
459048 for (i = 0; i < transf_size / 2; i++)
103 454272 FFSWAP(float, spec[i], spec[transf_size - 1 - i]);
104 }
105 7157 mdct_context->imdct_half(mdct_context, out, spec);
106 7157 }
107
108
109 2366 static int at1_imdct_block(AT1SUCtx* su, AT1Ctx *q)
110 {
111 int band_num, band_samples, log2_block_count, nbits, num_blocks, block_size;
112 2366 unsigned int start_pos, ref_pos = 0, pos = 0;
113
114
2/2
✓ Branch 0 taken 7098 times.
✓ Branch 1 taken 2366 times.
9464 for (band_num = 0; band_num < AT1_QMF_BANDS; band_num++) {
115 float *prev_buf;
116 int j;
117
118 7098 band_samples = samples_per_band[band_num];
119 7098 log2_block_count = su->log2_block_count[band_num];
120
121 /* number of mdct blocks in the current QMF band: 1 - for long mode */
122 /* 4 for short mode(low/middle bands) and 8 for short mode(high band)*/
123 7098 num_blocks = 1 << log2_block_count;
124
125
2/2
✓ Branch 0 taken 7085 times.
✓ Branch 1 taken 13 times.
7098 if (num_blocks == 1) {
126 /* mdct block size in samples: 128 (long mode, low & mid bands), */
127 /* 256 (long mode, high band) and 32 (short mode, all bands) */
128 7085 block_size = band_samples >> log2_block_count;
129
130 /* calc transform size in bits according to the block_size_mode */
131 7085 nbits = mdct_long_nbits[band_num] - log2_block_count;
132
133
4/6
✓ Branch 0 taken 7085 times.
✗ Branch 1 not taken.
✓ Branch 2 taken 2361 times.
✓ Branch 3 taken 4724 times.
✗ Branch 4 not taken.
✓ Branch 5 taken 2361 times.
7085 if (nbits != 5 && nbits != 7 && nbits != 8)
134 return AVERROR_INVALIDDATA;
135 } else {
136 13 block_size = 32;
137 13 nbits = 5;
138 }
139
140 7098 start_pos = 0;
141 7098 prev_buf = &su->spectrum[1][ref_pos + band_samples - 16];
142
2/2
✓ Branch 0 taken 7157 times.
✓ Branch 1 taken 7098 times.
14255 for (j=0; j < num_blocks; j++) {
143 7157 at1_imdct(q, &q->spec[pos], &su->spectrum[0][ref_pos + start_pos], nbits, band_num);
144
145 /* overlap and window */
146 7157 q->vector_fmul_window(&q->bands[band_num][start_pos], prev_buf,
147 7157 &su->spectrum[0][ref_pos + start_pos], ff_sine_32, 16);
148
149 7157 prev_buf = &su->spectrum[0][ref_pos+start_pos + 16];
150 7157 start_pos += block_size;
151 7157 pos += block_size;
152 }
153
154
2/2
✓ Branch 0 taken 7085 times.
✓ Branch 1 taken 13 times.
7098 if (num_blocks == 1)
155 7085 memcpy(q->bands[band_num] + 32, &su->spectrum[0][ref_pos + 16], 240 * sizeof(float));
156
157 7098 ref_pos += band_samples;
158 }
159
160 /* Swap buffers so the mdct overlap works */
161 2366 FFSWAP(float*, su->spectrum[0], su->spectrum[1]);
162
163 2366 return 0;
164 }
165
166 /**
167 * Parse the block size mode byte
168 */
169
170 2366 static int at1_parse_bsm(GetBitContext* gb, int log2_block_cnt[AT1_QMF_BANDS])
171 {
172 int log2_block_count_tmp, i;
173
174
2/2
✓ Branch 0 taken 4732 times.
✓ Branch 1 taken 2366 times.
7098 for (i = 0; i < 2; i++) {
175 /* low and mid band */
176 4732 log2_block_count_tmp = get_bits(gb, 2);
177
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 4732 times.
4732 if (log2_block_count_tmp & 1)
178 return AVERROR_INVALIDDATA;
179 4732 log2_block_cnt[i] = 2 - log2_block_count_tmp;
180 }
181
182 /* high band */
183 2366 log2_block_count_tmp = get_bits(gb, 2);
184
3/4
✓ Branch 0 taken 2361 times.
✓ Branch 1 taken 5 times.
✗ Branch 2 not taken.
✓ Branch 3 taken 2361 times.
2366 if (log2_block_count_tmp != 0 && log2_block_count_tmp != 3)
185 return AVERROR_INVALIDDATA;
186 2366 log2_block_cnt[IDX_HIGH_BAND] = 3 - log2_block_count_tmp;
187
188 2366 skip_bits(gb, 2);
189 2366 return 0;
190 }
191
192
193 2366 static int at1_unpack_dequant(GetBitContext* gb, AT1SUCtx* su,
194 float spec[AT1_SU_SAMPLES])
195 {
196 int bits_used, band_num, bfu_num, i;
197 uint8_t idwls[AT1_MAX_BFU]; ///< the word length indexes for each BFU
198 uint8_t idsfs[AT1_MAX_BFU]; ///< the scalefactor indexes for each BFU
199
200 /* parse the info byte (2nd byte) telling how much BFUs were coded */
201 2366 su->num_bfus = bfu_amount_tab1[get_bits(gb, 3)];
202
203 /* calc number of consumed bits:
204 num_BFUs * (idwl(4bits) + idsf(6bits)) + log2_block_count(8bits) + info_byte(8bits)
205 + info_byte_copy(8bits) + log2_block_count_copy(8bits) */
206 7098 bits_used = su->num_bfus * 10 + 32 +
207 2366 bfu_amount_tab2[get_bits(gb, 2)] +
208 2366 (bfu_amount_tab3[get_bits(gb, 3)] << 1);
209
210 /* get word length index (idwl) for each BFU */
211
2/2
✓ Branch 0 taken 105308 times.
✓ Branch 1 taken 2366 times.
107674 for (i = 0; i < su->num_bfus; i++)
212 105308 idwls[i] = get_bits(gb, 4);
213
214 /* get scalefactor index (idsf) for each BFU */
215
2/2
✓ Branch 0 taken 105308 times.
✓ Branch 1 taken 2366 times.
107674 for (i = 0; i < su->num_bfus; i++)
216 105308 idsfs[i] = get_bits(gb, 6);
217
218 /* zero idwl/idsf for empty BFUs */
219
2/2
✓ Branch 0 taken 17724 times.
✓ Branch 1 taken 2366 times.
20090 for (i = su->num_bfus; i < AT1_MAX_BFU; i++)
220 17724 idwls[i] = idsfs[i] = 0;
221
222 /* read in the spectral data and reconstruct MDCT spectrum of this channel */
223
2/2
✓ Branch 0 taken 7098 times.
✓ Branch 1 taken 2366 times.
9464 for (band_num = 0; band_num < AT1_QMF_BANDS; band_num++) {
224
2/2
✓ Branch 0 taken 123032 times.
✓ Branch 1 taken 7098 times.
130130 for (bfu_num = bfu_bands_t[band_num]; bfu_num < bfu_bands_t[band_num+1]; bfu_num++) {
225 int pos;
226
227 123032 int num_specs = specs_per_bfu[bfu_num];
228 123032 int word_len = !!idwls[bfu_num] + idwls[bfu_num];
229 123032 float scale_factor = ff_atrac_sf_table[idsfs[bfu_num]];
230 123032 bits_used += word_len * num_specs; /* add number of bits consumed by current BFU */
231
232 /* check for bitstream overflow */
233
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 123032 times.
123032 if (bits_used > AT1_SU_MAX_BITS)
234 return AVERROR_INVALIDDATA;
235
236 /* get the position of the 1st spec according to the block size mode */
237
2/2
✓ Branch 0 taken 228 times.
✓ Branch 1 taken 122804 times.
123032 pos = su->log2_block_count[band_num] ? bfu_start_short[bfu_num] : bfu_start_long[bfu_num];
238
239
2/2
✓ Branch 0 taken 57252 times.
✓ Branch 1 taken 65780 times.
123032 if (word_len) {
240 57252 float max_quant = 1.0 / (float)((1 << (word_len - 1)) - 1);
241
242
2/2
✓ Branch 0 taken 498028 times.
✓ Branch 1 taken 57252 times.
555280 for (i = 0; i < num_specs; i++) {
243 /* read in a quantized spec and convert it to
244 * signed int and then inverse quantization
245 */
246 498028 spec[pos+i] = get_sbits(gb, word_len) * scale_factor * max_quant;
247 }
248 } else { /* word_len = 0 -> empty BFU, zero all specs in the empty BFU */
249 65780 memset(&spec[pos], 0, num_specs * sizeof(float));
250 }
251 }
252 }
253
254 2366 return 0;
255 }
256
257
258 2366 static void at1_subband_synthesis(AT1Ctx *q, AT1SUCtx* su, float *pOut)
259 {
260 float temp[256];
261 float iqmf_temp[512 + 46];
262
263 /* combine low and middle bands */
264 2366 ff_atrac_iqmf(q->bands[0], q->bands[1], 128, temp, su->fst_qmf_delay, iqmf_temp);
265
266 /* delay the signal of the high band by 39 samples */
267 2366 memcpy( su->last_qmf_delay, &su->last_qmf_delay[256], sizeof(float) * 39);
268 2366 memcpy(&su->last_qmf_delay[39], q->bands[2], sizeof(float) * 256);
269
270 /* combine (low + middle) and high bands */
271 2366 ff_atrac_iqmf(temp, su->last_qmf_delay, 256, pOut, su->snd_qmf_delay, iqmf_temp);
272 2366 }
273
274
275 1184 static int atrac1_decode_frame(AVCodecContext *avctx, void *data,
276 int *got_frame_ptr, AVPacket *avpkt)
277 {
278 1184 AVFrame *frame = data;
279 1184 const uint8_t *buf = avpkt->data;
280 1184 int buf_size = avpkt->size;
281 1184 AT1Ctx *q = avctx->priv_data;
282 int ch, ret;
283 GetBitContext gb;
284
285
286
2/2
✓ Branch 0 taken 1 times.
✓ Branch 1 taken 1183 times.
1184 if (buf_size < 212 * avctx->channels) {
287 1 av_log(avctx, AV_LOG_ERROR, "Not enough data to decode!\n");
288 1 return AVERROR_INVALIDDATA;
289 }
290
291 /* get output buffer */
292 1183 frame->nb_samples = AT1_SU_SAMPLES;
293
1/2
✗ Branch 1 not taken.
✓ Branch 2 taken 1183 times.
1183 if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
294 return ret;
295
296
2/2
✓ Branch 0 taken 2366 times.
✓ Branch 1 taken 1183 times.
3549 for (ch = 0; ch < avctx->channels; ch++) {
297 2366 AT1SUCtx* su = &q->SUs[ch];
298
299 2366 init_get_bits(&gb, &buf[212 * ch], 212 * 8);
300
301 /* parse block_size_mode, 1st byte */
302 2366 ret = at1_parse_bsm(&gb, su->log2_block_count);
303
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 2366 times.
2366 if (ret < 0)
304 return ret;
305
306 2366 ret = at1_unpack_dequant(&gb, su, q->spec);
307
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 2366 times.
2366 if (ret < 0)
308 return ret;
309
310 2366 ret = at1_imdct_block(su, q);
311
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 2366 times.
2366 if (ret < 0)
312 return ret;
313 2366 at1_subband_synthesis(q, su, (float *)frame->extended_data[ch]);
314 }
315
316 1183 *got_frame_ptr = 1;
317
318 1183 return avctx->block_align;
319 }
320
321
322 5 static av_cold int atrac1_decode_end(AVCodecContext * avctx)
323 {
324 5 AT1Ctx *q = avctx->priv_data;
325
326 5 ff_mdct_end(&q->mdct_ctx[0]);
327 5 ff_mdct_end(&q->mdct_ctx[1]);
328 5 ff_mdct_end(&q->mdct_ctx[2]);
329
330 5 return 0;
331 }
332
333
334 5 static av_cold int atrac1_decode_init(AVCodecContext *avctx)
335 {
336 5 AT1Ctx *q = avctx->priv_data;
337 AVFloatDSPContext *fdsp;
338 int ret;
339
340 5 avctx->sample_fmt = AV_SAMPLE_FMT_FLTP;
341
342
2/4
✓ Branch 0 taken 5 times.
✗ Branch 1 not taken.
✗ Branch 2 not taken.
✓ Branch 3 taken 5 times.
5 if (avctx->channels < 1 || avctx->channels > AT1_MAX_CHANNELS) {
343 av_log(avctx, AV_LOG_ERROR, "Unsupported number of channels: %d\n",
344 avctx->channels);
345 return AVERROR(EINVAL);
346 }
347
348
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 5 times.
5 if (avctx->block_align <= 0) {
349 av_log(avctx, AV_LOG_ERROR, "Unsupported block align.");
350 return AVERROR_PATCHWELCOME;
351 }
352
353 /* Init the mdct transforms */
354
2/4
✓ Branch 1 taken 5 times.
✗ Branch 2 not taken.
✓ Branch 3 taken 5 times.
✗ Branch 4 not taken.
10 if ((ret = ff_mdct_init(&q->mdct_ctx[0], 6, 1, -1.0/ (1 << 15))) ||
355
1/2
✗ Branch 1 not taken.
✓ Branch 2 taken 5 times.
10 (ret = ff_mdct_init(&q->mdct_ctx[1], 8, 1, -1.0/ (1 << 15))) ||
356 5 (ret = ff_mdct_init(&q->mdct_ctx[2], 9, 1, -1.0/ (1 << 15)))) {
357 av_log(avctx, AV_LOG_ERROR, "Error initializing MDCT\n");
358 return ret;
359 }
360
361 5 ff_init_ff_sine_windows(5);
362
363 5 ff_atrac_generate_tables();
364
365 5 fdsp = avpriv_float_dsp_alloc(avctx->flags & AV_CODEC_FLAG_BITEXACT);
366
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 5 times.
5 if (!fdsp)
367 return AVERROR(ENOMEM);
368 5 q->vector_fmul_window = fdsp->vector_fmul_window;
369 5 av_free(fdsp);
370
371 5 q->bands[0] = q->low;
372 5 q->bands[1] = q->mid;
373 5 q->bands[2] = q->high;
374
375 /* Prepare the mdct overlap buffers */
376 5 q->SUs[0].spectrum[0] = q->SUs[0].spec1;
377 5 q->SUs[0].spectrum[1] = q->SUs[0].spec2;
378 5 q->SUs[1].spectrum[0] = q->SUs[1].spec1;
379 5 q->SUs[1].spectrum[1] = q->SUs[1].spec2;
380
381 5 return 0;
382 }
383
384
385 const AVCodec ff_atrac1_decoder = {
386 .name = "atrac1",
387 .long_name = NULL_IF_CONFIG_SMALL("ATRAC1 (Adaptive TRansform Acoustic Coding)"),
388 .type = AVMEDIA_TYPE_AUDIO,
389 .id = AV_CODEC_ID_ATRAC1,
390 .priv_data_size = sizeof(AT1Ctx),
391 .init = atrac1_decode_init,
392 .close = atrac1_decode_end,
393 .decode = atrac1_decode_frame,
394 .capabilities = AV_CODEC_CAP_DR1,
395 .sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLTP,
396 AV_SAMPLE_FMT_NONE },
397 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE | FF_CODEC_CAP_INIT_CLEANUP,
398 };
399