FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/atrac3plusdec.c
Date: 2026-01-16 07:34:38
Exec Total Coverage
Lines: 130 204 63.7%
Functions: 7 7 100.0%
Branches: 52 92 56.5%
Line Branch Exec Source
1 /*
2 * ATRAC3+ compatible decoder
3 *
4 * Copyright (c) 2010-2013 Maxim Poliakovski
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 * Sony ATRAC3+ compatible decoder.
26 *
27 * Container formats used to store its data:
28 * RIFF WAV (.at3) and Sony OpenMG (.oma, .aa3).
29 *
30 * Technical description of this codec can be found here:
31 * http://wiki.multimedia.cx/index.php?title=ATRAC3plus
32 *
33 * Kudos to Benjamin Larsson and Michael Karcher
34 * for their precious technical help!
35 */
36
37 #include <stdint.h>
38 #include <string.h>
39
40 #include "libavutil/channel_layout.h"
41 #include "libavutil/float_dsp.h"
42 #include "libavutil/mem.h"
43 #include "libavutil/mem_internal.h"
44 #include "libavutil/thread.h"
45 #include "avcodec.h"
46 #include "codec_internal.h"
47 #include "decode.h"
48 #include "get_bits.h"
49 #include "atrac.h"
50 #include "atrac3plus.h"
51
52 static const uint8_t channel_map[8][8] = {
53 { 0, },
54 { 0, 1, },
55 { 0, 1, 2, },
56 { 0, 1, 2, 3, },
57 { 0, },
58 { 0, 1, 2, 4, 5, 3, },
59 { 0, 1, 2, 4, 5, 6, 3, },
60 { 0, 1, 2, 4, 5, 6, 7, 3, },
61 };
62
63 typedef struct ATRAC3PContext {
64 GetBitContext gb;
65 AVFloatDSPContext *fdsp;
66
67 DECLARE_ALIGNED(32, float, samples)[2][ATRAC3P_FRAME_SAMPLES]; ///< quantized MDCT spectrum
68 DECLARE_ALIGNED(32, float, mdct_buf)[2][ATRAC3P_FRAME_SAMPLES]; ///< output of the IMDCT
69 DECLARE_ALIGNED(32, float, time_buf)[2][ATRAC3P_FRAME_SAMPLES]; ///< output of the gain compensation
70 DECLARE_ALIGNED(32, float, outp_buf)[2][ATRAC3P_FRAME_SAMPLES];
71
72 AtracGCContext gainc_ctx; ///< gain compensation context
73 AVTXContext *mdct_ctx;
74 av_tx_fn mdct_fn;
75 AVTXContext *ipqf_dct_ctx; ///< IDCT context used by IPQF
76 av_tx_fn ipqf_dct_fn;
77
78 Atrac3pChanUnitCtx *ch_units; ///< global channel units
79
80 int num_channel_blocks; ///< number of channel blocks
81 uint8_t channel_blocks[5]; ///< channel configuration descriptor
82 const uint8_t *channel_map; ///< channel layout map
83 } ATRAC3PContext;
84
85 8 static av_cold int atrac3p_decode_close(AVCodecContext *avctx)
86 {
87 8 ATRAC3PContext *ctx = avctx->priv_data;
88
89 8 av_freep(&ctx->ch_units);
90 8 av_freep(&ctx->fdsp);
91
92 8 av_tx_uninit(&ctx->mdct_ctx);
93 8 av_tx_uninit(&ctx->ipqf_dct_ctx);
94
95 8 return 0;
96 }
97
98 8 static av_cold int set_channel_params(ATRAC3PContext *ctx,
99 AVCodecContext *avctx)
100 {
101 8 int channels = avctx->ch_layout.nb_channels;
102 8 memset(ctx->channel_blocks, 0, sizeof(ctx->channel_blocks));
103
104 8 av_channel_layout_uninit(&avctx->ch_layout);
105
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 8 switch (channels) {
106 ✗ case 1:
107 ✗ avctx->ch_layout = (AVChannelLayout)AV_CHANNEL_LAYOUT_MONO;
108 ✗ ctx->num_channel_blocks = 1;
109 ✗ ctx->channel_blocks[0] = CH_UNIT_MONO;
110 ✗ break;
111 8 case 2:
112 8 avctx->ch_layout = (AVChannelLayout)AV_CHANNEL_LAYOUT_STEREO;
113 8 ctx->num_channel_blocks = 1;
114 8 ctx->channel_blocks[0] = CH_UNIT_STEREO;
115 8 break;
116 ✗ case 3:
117 ✗ avctx->ch_layout = (AVChannelLayout)AV_CHANNEL_LAYOUT_SURROUND;
118 ✗ ctx->num_channel_blocks = 2;
119 ✗ ctx->channel_blocks[0] = CH_UNIT_STEREO;
120 ✗ ctx->channel_blocks[1] = CH_UNIT_MONO;
121 ✗ break;
122 ✗ case 4:
123 ✗ avctx->ch_layout = (AVChannelLayout)AV_CHANNEL_LAYOUT_4POINT0;
124 ✗ ctx->num_channel_blocks = 3;
125 ✗ ctx->channel_blocks[0] = CH_UNIT_STEREO;
126 ✗ ctx->channel_blocks[1] = CH_UNIT_MONO;
127 ✗ ctx->channel_blocks[2] = CH_UNIT_MONO;
128 ✗ break;
129 ✗ case 6:
130 ✗ avctx->ch_layout = (AVChannelLayout)AV_CHANNEL_LAYOUT_5POINT1_BACK;
131 ✗ ctx->num_channel_blocks = 4;
132 ✗ ctx->channel_blocks[0] = CH_UNIT_STEREO;
133 ✗ ctx->channel_blocks[1] = CH_UNIT_MONO;
134 ✗ ctx->channel_blocks[2] = CH_UNIT_STEREO;
135 ✗ ctx->channel_blocks[3] = CH_UNIT_MONO;
136 ✗ break;
137 ✗ case 7:
138 ✗ avctx->ch_layout = (AVChannelLayout)AV_CHANNEL_LAYOUT_6POINT1_BACK;
139 ✗ ctx->num_channel_blocks = 5;
140 ✗ ctx->channel_blocks[0] = CH_UNIT_STEREO;
141 ✗ ctx->channel_blocks[1] = CH_UNIT_MONO;
142 ✗ ctx->channel_blocks[2] = CH_UNIT_STEREO;
143 ✗ ctx->channel_blocks[3] = CH_UNIT_MONO;
144 ✗ ctx->channel_blocks[4] = CH_UNIT_MONO;
145 ✗ break;
146 ✗ case 8:
147 ✗ avctx->ch_layout = (AVChannelLayout)AV_CHANNEL_LAYOUT_7POINT1;
148 ✗ ctx->num_channel_blocks = 5;
149 ✗ ctx->channel_blocks[0] = CH_UNIT_STEREO;
150 ✗ ctx->channel_blocks[1] = CH_UNIT_MONO;
151 ✗ ctx->channel_blocks[2] = CH_UNIT_STEREO;
152 ✗ ctx->channel_blocks[3] = CH_UNIT_STEREO;
153 ✗ ctx->channel_blocks[4] = CH_UNIT_MONO;
154 ✗ break;
155 ✗ default:
156 ✗ av_log(avctx, AV_LOG_ERROR,
157 "Unsupported channel count: %d!\n", channels);
158 ✗ return AVERROR_INVALIDDATA;
159 }
160
161 8 ctx->channel_map = channel_map[channels - 1];
162
163 8 return 0;
164 }
165
166 5 static av_cold void atrac3p_init_static(void)
167 {
168 5 ff_atrac3p_init_vlcs();
169 5 ff_atrac3p_init_dsp_static();
170 5 }
171
172 8 static av_cold int atrac3p_decode_init(AVCodecContext *avctx)
173 {
174 static AVOnce init_static_once = AV_ONCE_INIT;
175 8 ATRAC3PContext *ctx = avctx->priv_data;
176 float scale;
177 int i, ch, ret;
178
179
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 8 if (!avctx->block_align) {
180 ✗ av_log(avctx, AV_LOG_ERROR, "block_align is not set\n");
181 ✗ return AVERROR(EINVAL);
182 }
183
184 /* initialize IPQF */
185 8 scale = 32.0 / 32768.0;
186 8 ret = av_tx_init(&ctx->ipqf_dct_ctx, &ctx->ipqf_dct_fn, AV_TX_FLOAT_MDCT,
187 1, 16, &scale, 0);
188
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 8 if (ret < 0)
189 ✗ return ret;
190
191 8 scale = -1.0f;
192 8 ret = av_tx_init(&ctx->mdct_ctx, &ctx->mdct_fn, AV_TX_FLOAT_MDCT,
193 1, 128, &scale, AV_TX_FULL_IMDCT);
194
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 8 if (ret < 0)
195 ✗ return ret;
196
197 8 ff_atrac_init_gain_compensation(&ctx->gainc_ctx, 6, 2);
198
199
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 8 if ((ret = set_channel_params(ctx, avctx)) < 0)
200 ✗ return ret;
201
202 8 ctx->ch_units = av_calloc(ctx->num_channel_blocks, sizeof(*ctx->ch_units));
203 8 ctx->fdsp = avpriv_float_dsp_alloc(avctx->flags & AV_CODEC_FLAG_BITEXACT);
204
205
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 8 if (!ctx->ch_units || !ctx->fdsp) {
206 ✗ return AVERROR(ENOMEM);
207 }
208
209
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 16 for (i = 0; i < ctx->num_channel_blocks; i++) {
210
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 24 for (ch = 0; ch < 2; ch++) {
211 16 ctx->ch_units[i].channels[ch].ch_num = ch;
212 16 ctx->ch_units[i].channels[ch].wnd_shape = &ctx->ch_units[i].channels[ch].wnd_shape_hist[0][0];
213 16 ctx->ch_units[i].channels[ch].wnd_shape_prev = &ctx->ch_units[i].channels[ch].wnd_shape_hist[1][0];
214 16 ctx->ch_units[i].channels[ch].gain_data = &ctx->ch_units[i].channels[ch].gain_data_hist[0][0];
215 16 ctx->ch_units[i].channels[ch].gain_data_prev = &ctx->ch_units[i].channels[ch].gain_data_hist[1][0];
216 16 ctx->ch_units[i].channels[ch].tones_info = &ctx->ch_units[i].channels[ch].tones_info_hist[0][0];
217 16 ctx->ch_units[i].channels[ch].tones_info_prev = &ctx->ch_units[i].channels[ch].tones_info_hist[1][0];
218 }
219
220 8 ctx->ch_units[i].waves_info = &ctx->ch_units[i].wave_synth_hist[0];
221 8 ctx->ch_units[i].waves_info_prev = &ctx->ch_units[i].wave_synth_hist[1];
222 }
223
224 8 avctx->sample_fmt = AV_SAMPLE_FMT_FLTP;
225
226 8 ff_thread_once(&init_static_once, atrac3p_init_static);
227
228 8 return 0;
229 }
230
231 813 static void decode_residual_spectrum(ATRAC3PContext *ctx, Atrac3pChanUnitCtx *ch_unit,
232 float out[2][ATRAC3P_FRAME_SAMPLES],
233 int num_channels,
234 AVCodecContext *avctx)
235 {
236 int i, sb, ch, qu, nspeclines, RNG_index;
237 float *dst, q;
238 int16_t *src;
239 /* calculate RNG table index for each subband */
240 813 int sb_RNG_index[ATRAC3P_SUBBANDS] = { 0 };
241
242
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 813 if (ch_unit->mute_flag) {
243 ✗ for (ch = 0; ch < num_channels; ch++)
244 ✗ memset(out[ch], 0, ATRAC3P_FRAME_SAMPLES * sizeof(*out[ch]));
245 ✗ return;
246 }
247
248
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 22793 for (qu = 0, RNG_index = 0; qu < ch_unit->used_quant_units; qu++)
249 21980 RNG_index += ch_unit->channels[0].qu_sf_idx[qu] +
250 21980 ch_unit->channels[1].qu_sf_idx[qu];
251
252
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 10377 for (sb = 0; sb < ch_unit->num_coded_subbands; sb++, RNG_index += 128)
253 9564 sb_RNG_index[sb] = RNG_index & 0x3FC;
254
255 /* inverse quant and power compensation */
256
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 2439 for (ch = 0; ch < num_channels; ch++) {
257 /* clear channel's residual spectrum */
258 1626 memset(out[ch], 0, ATRAC3P_FRAME_SAMPLES * sizeof(*out[ch]));
259
260
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 45586 for (qu = 0; qu < ch_unit->used_quant_units; qu++) {
261 43960 src = &ch_unit->channels[ch].spectrum[ff_atrac3p_qu_to_spec_pos[qu]];
262 43960 dst = &out[ch][ff_atrac3p_qu_to_spec_pos[qu]];
263 43960 nspeclines = ff_atrac3p_qu_to_spec_pos[qu + 1] -
264 43960 ff_atrac3p_qu_to_spec_pos[qu];
265
266
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 43960 if (ch_unit->channels[ch].qu_wordlen[qu] > 0) {
267 43960 q = ff_atrac3p_sf_tab[ch_unit->channels[ch].qu_sf_idx[qu]] *
268 43960 ff_atrac3p_mant_tab[ch_unit->channels[ch].qu_wordlen[qu]];
269
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 2492344 for (i = 0; i < nspeclines; i++)
270 2448384 dst[i] = src[i] * q;
271 }
272 }
273
274
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 20754 for (sb = 0; sb < ch_unit->num_coded_subbands; sb++)
275 19128 ff_atrac3p_power_compensation(ch_unit, ctx->fdsp, ch, &out[ch][0],
276 sb_RNG_index[sb], sb);
277 }
278
279
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 813 if (ch_unit->unit_type == CH_UNIT_STEREO) {
280
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 10377 for (sb = 0; sb < ch_unit->num_coded_subbands; sb++) {
281
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 9564 if (ch_unit->swap_channels[sb]) {
282 ✗ for (i = 0; i < ATRAC3P_SUBBAND_SAMPLES; i++)
283 ✗ FFSWAP(float, out[0][sb * ATRAC3P_SUBBAND_SAMPLES + i],
284 out[1][sb * ATRAC3P_SUBBAND_SAMPLES + i]);
285 }
286
287 /* flip coefficients' sign if requested */
288
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 9564 if (ch_unit->negate_coeffs[sb])
289 ✗ for (i = 0; i < ATRAC3P_SUBBAND_SAMPLES; i++)
290 ✗ out[1][sb * ATRAC3P_SUBBAND_SAMPLES + i] = -(out[1][sb * ATRAC3P_SUBBAND_SAMPLES + i]);
291 }
292 }
293 }
294
295 813 static void reconstruct_frame(ATRAC3PContext *ctx, Atrac3pChanUnitCtx *ch_unit,
296 int num_channels, AVCodecContext *avctx)
297 {
298 int ch, sb;
299
300
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 2439 for (ch = 0; ch < num_channels; ch++) {
301
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 23298 for (sb = 0; sb < ch_unit->num_subbands; sb++) {
302 /* inverse transform and windowing */
303 21672 ff_atrac3p_imdct(ctx->fdsp, ctx->mdct_ctx, ctx->mdct_fn,
304 21672 &ctx->samples[ch][sb * ATRAC3P_SUBBAND_SAMPLES],
305 21672 &ctx->mdct_buf[ch][sb * ATRAC3P_SUBBAND_SAMPLES],
306 21672 (ch_unit->channels[ch].wnd_shape_prev[sb] << 1) +
307 21672 ch_unit->channels[ch].wnd_shape[sb], sb);
308
309 /* gain compensation and overlapping */
310 21672 ff_atrac_gain_compensation(&ctx->gainc_ctx,
311 21672 &ctx->mdct_buf[ch][sb * ATRAC3P_SUBBAND_SAMPLES],
312 21672 &ch_unit->prev_buf[ch][sb * ATRAC3P_SUBBAND_SAMPLES],
313 21672 &ch_unit->channels[ch].gain_data_prev[sb],
314 21672 &ch_unit->channels[ch].gain_data[sb],
315 ATRAC3P_SUBBAND_SAMPLES,
316 21672 &ctx->time_buf[ch][sb * ATRAC3P_SUBBAND_SAMPLES]);
317 }
318
319 /* zero unused subbands in both output and overlapping buffers */
320 1626 memset(&ch_unit->prev_buf[ch][ch_unit->num_subbands * ATRAC3P_SUBBAND_SAMPLES],
321 0,
322 1626 (ATRAC3P_SUBBANDS - ch_unit->num_subbands) *
323 ATRAC3P_SUBBAND_SAMPLES *
324 sizeof(ch_unit->prev_buf[ch][ch_unit->num_subbands * ATRAC3P_SUBBAND_SAMPLES]));
325 1626 memset(&ctx->time_buf[ch][ch_unit->num_subbands * ATRAC3P_SUBBAND_SAMPLES],
326 0,
327 1626 (ATRAC3P_SUBBANDS - ch_unit->num_subbands) *
328 ATRAC3P_SUBBAND_SAMPLES *
329 sizeof(ctx->time_buf[ch][ch_unit->num_subbands * ATRAC3P_SUBBAND_SAMPLES]));
330
331 /* resynthesize and add tonal signal */
332
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 1626 if (ch_unit->waves_info->tones_present ||
333
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 1626 ch_unit->waves_info_prev->tones_present) {
334 ✗ for (sb = 0; sb < ch_unit->num_subbands; sb++)
335 ✗ if (ch_unit->channels[ch].tones_info[sb].num_wavs ||
336 ✗ ch_unit->channels[ch].tones_info_prev[sb].num_wavs) {
337 ✗ ff_atrac3p_generate_tones(ch_unit, ctx->fdsp, ch, sb,
338 ✗ &ctx->time_buf[ch][sb * 128]);
339 }
340 }
341
342 /* subband synthesis and acoustic signal output */
343 1626 ff_atrac3p_ipqf(ctx->ipqf_dct_ctx, ctx->ipqf_dct_fn,
344 1626 &ch_unit->ipqf_ctx[ch], &ctx->time_buf[ch][0],
345 &ctx->outp_buf[ch][0]);
346 }
347
348 /* swap window shape and gain control buffers. */
349
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 2439 for (ch = 0; ch < num_channels; ch++) {
350 1626 FFSWAP(uint8_t *, ch_unit->channels[ch].wnd_shape,
351 ch_unit->channels[ch].wnd_shape_prev);
352 1626 FFSWAP(AtracGainInfo *, ch_unit->channels[ch].gain_data,
353 ch_unit->channels[ch].gain_data_prev);
354 1626 FFSWAP(Atrac3pWavesData *, ch_unit->channels[ch].tones_info,
355 ch_unit->channels[ch].tones_info_prev);
356 }
357
358 813 FFSWAP(Atrac3pWaveSynthParams *, ch_unit->waves_info, ch_unit->waves_info_prev);
359 813 }
360
361 813 static int atrac3p_decode_frame(AVCodecContext *avctx, AVFrame *frame,
362 int *got_frame_ptr, AVPacket *avpkt)
363 {
364 813 ATRAC3PContext *ctx = avctx->priv_data;
365 813 int i, ret, ch_unit_id, ch_block = 0, out_ch_index = 0, channels_to_process;
366 813 float **samples_p = (float **)frame->extended_data;
367
368 813 frame->nb_samples = ATRAC3P_FRAME_SAMPLES;
369
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 813 if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
370 ✗ return ret;
371
372
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 813 if ((ret = init_get_bits8(&ctx->gb, avpkt->data, avpkt->size)) < 0)
373 ✗ return ret;
374
375
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 813 if (get_bits1(&ctx->gb)) {
376 ✗ av_log(avctx, AV_LOG_ERROR, "Invalid start bit!\n");
377 ✗ return AVERROR_INVALIDDATA;
378 }
379
380
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 1626 while (get_bits_left(&ctx->gb) >= 2 &&
381
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 1625 (ch_unit_id = get_bits(&ctx->gb, 2)) != CH_UNIT_TERMINATOR) {
382
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 813 if (ch_unit_id == CH_UNIT_EXTENSION) {
383 ✗ avpriv_report_missing_feature(avctx, "Channel unit extension");
384 ✗ return AVERROR_PATCHWELCOME;
385 }
386
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 813 if (ch_block >= ctx->num_channel_blocks ||
387
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 813 ctx->channel_blocks[ch_block] != ch_unit_id) {
388 ✗ av_log(avctx, AV_LOG_ERROR,
389 "Frame data doesn't match channel configuration!\n");
390 ✗ return AVERROR_INVALIDDATA;
391 }
392
393 813 ctx->ch_units[ch_block].unit_type = ch_unit_id;
394 813 channels_to_process = ch_unit_id + 1;
395
396
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 813 if ((ret = ff_atrac3p_decode_channel_unit(&ctx->gb,
397 813 &ctx->ch_units[ch_block],
398 channels_to_process,
399 avctx)) < 0)
400 ✗ return ret;
401
402 813 decode_residual_spectrum(ctx, &ctx->ch_units[ch_block], ctx->samples,
403 channels_to_process, avctx);
404 813 reconstruct_frame(ctx, &ctx->ch_units[ch_block],
405 channels_to_process, avctx);
406
407
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 2439 for (i = 0; i < channels_to_process; i++)
408 1626 memcpy(samples_p[ctx->channel_map[out_ch_index + i]], ctx->outp_buf[i],
409 ATRAC3P_FRAME_SAMPLES * sizeof(**samples_p));
410
411 813 ch_block++;
412 813 out_ch_index += channels_to_process;
413 }
414
415 813 *got_frame_ptr = 1;
416
417
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 813 return avctx->codec_id == AV_CODEC_ID_ATRAC3P ? FFMIN(avctx->block_align, avpkt->size) : avpkt->size;
418 }
419
420 const FFCodec ff_atrac3p_decoder = {
421 .p.name = "atrac3plus",
422 CODEC_LONG_NAME("ATRAC3+ (Adaptive TRansform Acoustic Coding 3+)"),
423 .p.type = AVMEDIA_TYPE_AUDIO,
424 .p.id = AV_CODEC_ID_ATRAC3P,
425 .p.capabilities = AV_CODEC_CAP_DR1,
426 .caps_internal = FF_CODEC_CAP_INIT_CLEANUP,
427 .priv_data_size = sizeof(ATRAC3PContext),
428 .init = atrac3p_decode_init,
429 .close = atrac3p_decode_close,
430 FF_CODEC_DECODE_CB(atrac3p_decode_frame),
431 };
432
433 const FFCodec ff_atrac3pal_decoder = {
434 .p.name = "atrac3plusal",
435 CODEC_LONG_NAME("ATRAC3+ AL (Adaptive TRansform Acoustic Coding 3+ Advanced Lossless)"),
436 .p.type = AVMEDIA_TYPE_AUDIO,
437 .p.id = AV_CODEC_ID_ATRAC3PAL,
438 .p.capabilities = AV_CODEC_CAP_DR1,
439 .caps_internal = FF_CODEC_CAP_INIT_CLEANUP,
440 .priv_data_size = sizeof(ATRAC3PContext),
441 .init = atrac3p_decode_init,
442 .close = atrac3p_decode_close,
443 FF_CODEC_DECODE_CB(atrac3p_decode_frame),
444 };
445