FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavcodec/atrac3plusdec.c
Date: 2021-09-16 08:47:15
Exec Total Coverage
Lines: 125 198 63.1%
Branches: 50 90 55.6%

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_internal.h"
43 #include "libavutil/thread.h"
44 #include "avcodec.h"
45 #include "get_bits.h"
46 #include "internal.h"
47 #include "atrac.h"
48 #include "atrac3plus.h"
49
50 typedef struct ATRAC3PContext {
51 GetBitContext gb;
52 AVFloatDSPContext *fdsp;
53
54 DECLARE_ALIGNED(32, float, samples)[2][ATRAC3P_FRAME_SAMPLES]; ///< quantized MDCT spectrum
55 DECLARE_ALIGNED(32, float, mdct_buf)[2][ATRAC3P_FRAME_SAMPLES]; ///< output of the IMDCT
56 DECLARE_ALIGNED(32, float, time_buf)[2][ATRAC3P_FRAME_SAMPLES]; ///< output of the gain compensation
57 DECLARE_ALIGNED(32, float, outp_buf)[2][ATRAC3P_FRAME_SAMPLES];
58
59 AtracGCContext gainc_ctx; ///< gain compensation context
60 FFTContext mdct_ctx;
61 FFTContext ipqf_dct_ctx; ///< IDCT context used by IPQF
62
63 Atrac3pChanUnitCtx *ch_units; ///< global channel units
64
65 int num_channel_blocks; ///< number of channel blocks
66 uint8_t channel_blocks[5]; ///< channel configuration descriptor
67 uint64_t my_channel_layout; ///< current channel layout
68 } ATRAC3PContext;
69
70 4 static av_cold int atrac3p_decode_close(AVCodecContext *avctx)
71 {
72 4 ATRAC3PContext *ctx = avctx->priv_data;
73
74 4 av_freep(&ctx->ch_units);
75 4 av_freep(&ctx->fdsp);
76
77 4 ff_mdct_end(&ctx->mdct_ctx);
78 4 ff_mdct_end(&ctx->ipqf_dct_ctx);
79
80 4 return 0;
81 }
82
83 4 static av_cold int set_channel_params(ATRAC3PContext *ctx,
84 AVCodecContext *avctx)
85 {
86 4 memset(ctx->channel_blocks, 0, sizeof(ctx->channel_blocks));
87
88
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4 switch (avctx->channels) {
89 case 1:
90 if (avctx->channel_layout != AV_CH_FRONT_LEFT)
91 avctx->channel_layout = AV_CH_LAYOUT_MONO;
92
93 ctx->num_channel_blocks = 1;
94 ctx->channel_blocks[0] = CH_UNIT_MONO;
95 break;
96 4 case 2:
97 4 avctx->channel_layout = AV_CH_LAYOUT_STEREO;
98 4 ctx->num_channel_blocks = 1;
99 4 ctx->channel_blocks[0] = CH_UNIT_STEREO;
100 4 break;
101 case 3:
102 avctx->channel_layout = AV_CH_LAYOUT_SURROUND;
103 ctx->num_channel_blocks = 2;
104 ctx->channel_blocks[0] = CH_UNIT_STEREO;
105 ctx->channel_blocks[1] = CH_UNIT_MONO;
106 break;
107 case 4:
108 avctx->channel_layout = AV_CH_LAYOUT_4POINT0;
109 ctx->num_channel_blocks = 3;
110 ctx->channel_blocks[0] = CH_UNIT_STEREO;
111 ctx->channel_blocks[1] = CH_UNIT_MONO;
112 ctx->channel_blocks[2] = CH_UNIT_MONO;
113 break;
114 case 6:
115 avctx->channel_layout = AV_CH_LAYOUT_5POINT1_BACK;
116 ctx->num_channel_blocks = 4;
117 ctx->channel_blocks[0] = CH_UNIT_STEREO;
118 ctx->channel_blocks[1] = CH_UNIT_MONO;
119 ctx->channel_blocks[2] = CH_UNIT_STEREO;
120 ctx->channel_blocks[3] = CH_UNIT_MONO;
121 break;
122 case 7:
123 avctx->channel_layout = AV_CH_LAYOUT_6POINT1_BACK;
124 ctx->num_channel_blocks = 5;
125 ctx->channel_blocks[0] = CH_UNIT_STEREO;
126 ctx->channel_blocks[1] = CH_UNIT_MONO;
127 ctx->channel_blocks[2] = CH_UNIT_STEREO;
128 ctx->channel_blocks[3] = CH_UNIT_MONO;
129 ctx->channel_blocks[4] = CH_UNIT_MONO;
130 break;
131 case 8:
132 avctx->channel_layout = AV_CH_LAYOUT_7POINT1;
133 ctx->num_channel_blocks = 5;
134 ctx->channel_blocks[0] = CH_UNIT_STEREO;
135 ctx->channel_blocks[1] = CH_UNIT_MONO;
136 ctx->channel_blocks[2] = CH_UNIT_STEREO;
137 ctx->channel_blocks[3] = CH_UNIT_STEREO;
138 ctx->channel_blocks[4] = CH_UNIT_MONO;
139 break;
140 default:
141 av_log(avctx, AV_LOG_ERROR,
142 "Unsupported channel count: %d!\n", avctx->channels);
143 return AVERROR_INVALIDDATA;
144 }
145
146 4 return 0;
147 }
148
149 2 static av_cold void atrac3p_init_static(void)
150 {
151 2 ff_atrac3p_init_vlcs();
152 2 ff_atrac3p_init_dsp_static();
153 2 }
154
155 4 static av_cold int atrac3p_decode_init(AVCodecContext *avctx)
156 {
157 static AVOnce init_static_once = AV_ONCE_INIT;
158 4 ATRAC3PContext *ctx = avctx->priv_data;
159 int i, ch, ret;
160
161
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4 if (!avctx->block_align) {
162 av_log(avctx, AV_LOG_ERROR, "block_align is not set\n");
163 return AVERROR(EINVAL);
164 }
165
166 /* initialize IPQF */
167 4 ff_mdct_init(&ctx->ipqf_dct_ctx, 5, 1, 32.0 / 32768.0);
168
169 4 ff_atrac3p_init_imdct(avctx, &ctx->mdct_ctx);
170
171 4 ff_atrac_init_gain_compensation(&ctx->gainc_ctx, 6, 2);
172
173
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4 if ((ret = set_channel_params(ctx, avctx)) < 0)
174 return ret;
175
176 4 ctx->my_channel_layout = avctx->channel_layout;
177
178 4 ctx->ch_units = av_mallocz_array(ctx->num_channel_blocks, sizeof(*ctx->ch_units));
179 4 ctx->fdsp = avpriv_float_dsp_alloc(avctx->flags & AV_CODEC_FLAG_BITEXACT);
180
181
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4 if (!ctx->ch_units || !ctx->fdsp) {
182 return AVERROR(ENOMEM);
183 }
184
185
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8 for (i = 0; i < ctx->num_channel_blocks; i++) {
186
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12 for (ch = 0; ch < 2; ch++) {
187 8 ctx->ch_units[i].channels[ch].ch_num = ch;
188 8 ctx->ch_units[i].channels[ch].wnd_shape = &ctx->ch_units[i].channels[ch].wnd_shape_hist[0][0];
189 8 ctx->ch_units[i].channels[ch].wnd_shape_prev = &ctx->ch_units[i].channels[ch].wnd_shape_hist[1][0];
190 8 ctx->ch_units[i].channels[ch].gain_data = &ctx->ch_units[i].channels[ch].gain_data_hist[0][0];
191 8 ctx->ch_units[i].channels[ch].gain_data_prev = &ctx->ch_units[i].channels[ch].gain_data_hist[1][0];
192 8 ctx->ch_units[i].channels[ch].tones_info = &ctx->ch_units[i].channels[ch].tones_info_hist[0][0];
193 8 ctx->ch_units[i].channels[ch].tones_info_prev = &ctx->ch_units[i].channels[ch].tones_info_hist[1][0];
194 }
195
196 4 ctx->ch_units[i].waves_info = &ctx->ch_units[i].wave_synth_hist[0];
197 4 ctx->ch_units[i].waves_info_prev = &ctx->ch_units[i].wave_synth_hist[1];
198 }
199
200 4 avctx->sample_fmt = AV_SAMPLE_FMT_FLTP;
201
202 4 ff_thread_once(&init_static_once, atrac3p_init_static);
203
204 4 return 0;
205 }
206
207 813 static void decode_residual_spectrum(ATRAC3PContext *ctx, Atrac3pChanUnitCtx *ch_unit,
208 float out[2][ATRAC3P_FRAME_SAMPLES],
209 int num_channels,
210 AVCodecContext *avctx)
211 {
212 int i, sb, ch, qu, nspeclines, RNG_index;
213 float *dst, q;
214 int16_t *src;
215 /* calculate RNG table index for each subband */
216 813 int sb_RNG_index[ATRAC3P_SUBBANDS] = { 0 };
217
218
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813 if (ch_unit->mute_flag) {
219 for (ch = 0; ch < num_channels; ch++)
220 memset(out[ch], 0, ATRAC3P_FRAME_SAMPLES * sizeof(*out[ch]));
221 return;
222 }
223
224
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22793 for (qu = 0, RNG_index = 0; qu < ch_unit->used_quant_units; qu++)
225 21980 RNG_index += ch_unit->channels[0].qu_sf_idx[qu] +
226 21980 ch_unit->channels[1].qu_sf_idx[qu];
227
228
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10377 for (sb = 0; sb < ch_unit->num_coded_subbands; sb++, RNG_index += 128)
229 9564 sb_RNG_index[sb] = RNG_index & 0x3FC;
230
231 /* inverse quant and power compensation */
232
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2439 for (ch = 0; ch < num_channels; ch++) {
233 /* clear channel's residual spectrum */
234 1626 memset(out[ch], 0, ATRAC3P_FRAME_SAMPLES * sizeof(*out[ch]));
235
236
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45586 for (qu = 0; qu < ch_unit->used_quant_units; qu++) {
237 43960 src = &ch_unit->channels[ch].spectrum[ff_atrac3p_qu_to_spec_pos[qu]];
238 43960 dst = &out[ch][ff_atrac3p_qu_to_spec_pos[qu]];
239 43960 nspeclines = ff_atrac3p_qu_to_spec_pos[qu + 1] -
240 43960 ff_atrac3p_qu_to_spec_pos[qu];
241
242
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43960 if (ch_unit->channels[ch].qu_wordlen[qu] > 0) {
243 43960 q = ff_atrac3p_sf_tab[ch_unit->channels[ch].qu_sf_idx[qu]] *
244 43960 ff_atrac3p_mant_tab[ch_unit->channels[ch].qu_wordlen[qu]];
245
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2492344 for (i = 0; i < nspeclines; i++)
246 2448384 dst[i] = src[i] * q;
247 }
248 }
249
250
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20754 for (sb = 0; sb < ch_unit->num_coded_subbands; sb++)
251 19128 ff_atrac3p_power_compensation(ch_unit, ctx->fdsp, ch, &out[ch][0],
252 sb_RNG_index[sb], sb);
253 }
254
255
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813 if (ch_unit->unit_type == CH_UNIT_STEREO) {
256
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10377 for (sb = 0; sb < ch_unit->num_coded_subbands; sb++) {
257
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9564 if (ch_unit->swap_channels[sb]) {
258 for (i = 0; i < ATRAC3P_SUBBAND_SAMPLES; i++)
259 FFSWAP(float, out[0][sb * ATRAC3P_SUBBAND_SAMPLES + i],
260 out[1][sb * ATRAC3P_SUBBAND_SAMPLES + i]);
261 }
262
263 /* flip coefficients' sign if requested */
264
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9564 if (ch_unit->negate_coeffs[sb])
265 for (i = 0; i < ATRAC3P_SUBBAND_SAMPLES; i++)
266 out[1][sb * ATRAC3P_SUBBAND_SAMPLES + i] = -(out[1][sb * ATRAC3P_SUBBAND_SAMPLES + i]);
267 }
268 }
269 }
270
271 813 static void reconstruct_frame(ATRAC3PContext *ctx, Atrac3pChanUnitCtx *ch_unit,
272 int num_channels, AVCodecContext *avctx)
273 {
274 int ch, sb;
275
276
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2439 for (ch = 0; ch < num_channels; ch++) {
277
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23298 for (sb = 0; sb < ch_unit->num_subbands; sb++) {
278 /* inverse transform and windowing */
279 21672 ff_atrac3p_imdct(ctx->fdsp, &ctx->mdct_ctx,
280 21672 &ctx->samples[ch][sb * ATRAC3P_SUBBAND_SAMPLES],
281 21672 &ctx->mdct_buf[ch][sb * ATRAC3P_SUBBAND_SAMPLES],
282 21672 (ch_unit->channels[ch].wnd_shape_prev[sb] << 1) +
283 21672 ch_unit->channels[ch].wnd_shape[sb], sb);
284
285 /* gain compensation and overlapping */
286 21672 ff_atrac_gain_compensation(&ctx->gainc_ctx,
287 21672 &ctx->mdct_buf[ch][sb * ATRAC3P_SUBBAND_SAMPLES],
288 21672 &ch_unit->prev_buf[ch][sb * ATRAC3P_SUBBAND_SAMPLES],
289 21672 &ch_unit->channels[ch].gain_data_prev[sb],
290 21672 &ch_unit->channels[ch].gain_data[sb],
291 ATRAC3P_SUBBAND_SAMPLES,
292 21672 &ctx->time_buf[ch][sb * ATRAC3P_SUBBAND_SAMPLES]);
293 }
294
295 /* zero unused subbands in both output and overlapping buffers */
296 1626 memset(&ch_unit->prev_buf[ch][ch_unit->num_subbands * ATRAC3P_SUBBAND_SAMPLES],
297 0,
298 1626 (ATRAC3P_SUBBANDS - ch_unit->num_subbands) *
299 ATRAC3P_SUBBAND_SAMPLES *
300 sizeof(ch_unit->prev_buf[ch][ch_unit->num_subbands * ATRAC3P_SUBBAND_SAMPLES]));
301 1626 memset(&ctx->time_buf[ch][ch_unit->num_subbands * ATRAC3P_SUBBAND_SAMPLES],
302 0,
303 1626 (ATRAC3P_SUBBANDS - ch_unit->num_subbands) *
304 ATRAC3P_SUBBAND_SAMPLES *
305 sizeof(ctx->time_buf[ch][ch_unit->num_subbands * ATRAC3P_SUBBAND_SAMPLES]));
306
307 /* resynthesize and add tonal signal */
308
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1626 if (ch_unit->waves_info->tones_present ||
309
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1626 ch_unit->waves_info_prev->tones_present) {
310 for (sb = 0; sb < ch_unit->num_subbands; sb++)
311 if (ch_unit->channels[ch].tones_info[sb].num_wavs ||
312 ch_unit->channels[ch].tones_info_prev[sb].num_wavs) {
313 ff_atrac3p_generate_tones(ch_unit, ctx->fdsp, ch, sb,
314 &ctx->time_buf[ch][sb * 128]);
315 }
316 }
317
318 /* subband synthesis and acoustic signal output */
319 1626 ff_atrac3p_ipqf(&ctx->ipqf_dct_ctx, &ch_unit->ipqf_ctx[ch],
320 1626 &ctx->time_buf[ch][0], &ctx->outp_buf[ch][0]);
321 }
322
323 /* swap window shape and gain control buffers. */
324
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2439 for (ch = 0; ch < num_channels; ch++) {
325 1626 FFSWAP(uint8_t *, ch_unit->channels[ch].wnd_shape,
326 ch_unit->channels[ch].wnd_shape_prev);
327 1626 FFSWAP(AtracGainInfo *, ch_unit->channels[ch].gain_data,
328 ch_unit->channels[ch].gain_data_prev);
329 1626 FFSWAP(Atrac3pWavesData *, ch_unit->channels[ch].tones_info,
330 ch_unit->channels[ch].tones_info_prev);
331 }
332
333 813 FFSWAP(Atrac3pWaveSynthParams *, ch_unit->waves_info, ch_unit->waves_info_prev);
334 813 }
335
336 813 static int atrac3p_decode_frame(AVCodecContext *avctx, void *data,
337 int *got_frame_ptr, AVPacket *avpkt)
338 {
339 813 ATRAC3PContext *ctx = avctx->priv_data;
340 813 AVFrame *frame = data;
341 813 int i, ret, ch_unit_id, ch_block = 0, out_ch_index = 0, channels_to_process;
342 813 float **samples_p = (float **)frame->extended_data;
343
344 813 frame->nb_samples = ATRAC3P_FRAME_SAMPLES;
345
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813 if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
346 return ret;
347
348
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813 if ((ret = init_get_bits8(&ctx->gb, avpkt->data, avpkt->size)) < 0)
349 return ret;
350
351
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813 if (get_bits1(&ctx->gb)) {
352 av_log(avctx, AV_LOG_ERROR, "Invalid start bit!\n");
353 return AVERROR_INVALIDDATA;
354 }
355
356
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1626 while (get_bits_left(&ctx->gb) >= 2 &&
357
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1625 (ch_unit_id = get_bits(&ctx->gb, 2)) != CH_UNIT_TERMINATOR) {
358
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813 if (ch_unit_id == CH_UNIT_EXTENSION) {
359 avpriv_report_missing_feature(avctx, "Channel unit extension");
360 return AVERROR_PATCHWELCOME;
361 }
362
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813 if (ch_block >= ctx->num_channel_blocks ||
363
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813 ctx->channel_blocks[ch_block] != ch_unit_id) {
364 av_log(avctx, AV_LOG_ERROR,
365 "Frame data doesn't match channel configuration!\n");
366 return AVERROR_INVALIDDATA;
367 }
368
369 813 ctx->ch_units[ch_block].unit_type = ch_unit_id;
370 813 channels_to_process = ch_unit_id + 1;
371
372
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813 if ((ret = ff_atrac3p_decode_channel_unit(&ctx->gb,
373 813 &ctx->ch_units[ch_block],
374 channels_to_process,
375 avctx)) < 0)
376 return ret;
377
378 813 decode_residual_spectrum(ctx, &ctx->ch_units[ch_block], ctx->samples,
379 channels_to_process, avctx);
380 813 reconstruct_frame(ctx, &ctx->ch_units[ch_block],
381 channels_to_process, avctx);
382
383
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2439 for (i = 0; i < channels_to_process; i++)
384 1626 memcpy(samples_p[out_ch_index + i], ctx->outp_buf[i],
385 ATRAC3P_FRAME_SAMPLES * sizeof(**samples_p));
386
387 813 ch_block++;
388 813 out_ch_index += channels_to_process;
389 }
390
391 813 *got_frame_ptr = 1;
392
393
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813 return avctx->codec_id == AV_CODEC_ID_ATRAC3P ? FFMIN(avctx->block_align, avpkt->size) : avpkt->size;
394 }
395
396 const AVCodec ff_atrac3p_decoder = {
397 .name = "atrac3plus",
398 .long_name = NULL_IF_CONFIG_SMALL("ATRAC3+ (Adaptive TRansform Acoustic Coding 3+)"),
399 .type = AVMEDIA_TYPE_AUDIO,
400 .id = AV_CODEC_ID_ATRAC3P,
401 .capabilities = AV_CODEC_CAP_DR1,
402 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE | FF_CODEC_CAP_INIT_CLEANUP,
403 .priv_data_size = sizeof(ATRAC3PContext),
404 .init = atrac3p_decode_init,
405 .close = atrac3p_decode_close,
406 .decode = atrac3p_decode_frame,
407 };
408
409 const AVCodec ff_atrac3pal_decoder = {
410 .name = "atrac3plusal",
411 .long_name = NULL_IF_CONFIG_SMALL("ATRAC3+ AL (Adaptive TRansform Acoustic Coding 3+ Advanced Lossless)"),
412 .type = AVMEDIA_TYPE_AUDIO,
413 .id = AV_CODEC_ID_ATRAC3PAL,
414 .capabilities = AV_CODEC_CAP_DR1,
415 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE | FF_CODEC_CAP_INIT_CLEANUP,
416 .priv_data_size = sizeof(ATRAC3PContext),
417 .init = atrac3p_decode_init,
418 .close = atrac3p_decode_close,
419 .decode = atrac3p_decode_frame,
420 };
421