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atrac3plusdec.c
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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 
41 #include "libavutil/float_dsp.h"
42 #include "avcodec.h"
43 #include "get_bits.h"
44 #include "internal.h"
45 #include "atrac.h"
46 #include "atrac3plus.h"
47 
48 typedef struct ATRAC3PContext {
51 
52  DECLARE_ALIGNED(32, float, samples)[2][ATRAC3P_FRAME_SAMPLES]; ///< quantized MDCT spectrum
53  DECLARE_ALIGNED(32, float, mdct_buf)[2][ATRAC3P_FRAME_SAMPLES]; ///< output of the IMDCT
54  DECLARE_ALIGNED(32, float, time_buf)[2][ATRAC3P_FRAME_SAMPLES]; ///< output of the gain compensation
56 
57  AtracGCContext gainc_ctx; ///< gain compensation context
59  FFTContext ipqf_dct_ctx; ///< IDCT context used by IPQF
60 
61  Atrac3pChanUnitCtx *ch_units; ///< global channel units
62 
63  int num_channel_blocks; ///< number of channel blocks
64  uint8_t channel_blocks[5]; ///< channel configuration descriptor
65  uint64_t my_channel_layout; ///< current channel layout
67 
69 {
70  av_free(((ATRAC3PContext *)(avctx->priv_data))->ch_units);
71 
72  return 0;
73 }
74 
76  AVCodecContext *avctx)
77 {
78  memset(ctx->channel_blocks, 0, sizeof(ctx->channel_blocks));
79 
80  switch (avctx->channels) {
81  case 1:
82  if (avctx->channel_layout != AV_CH_FRONT_LEFT)
84 
85  ctx->num_channel_blocks = 1;
86  ctx->channel_blocks[0] = CH_UNIT_MONO;
87  break;
88  case 2:
90  ctx->num_channel_blocks = 1;
92  break;
93  case 3:
95  ctx->num_channel_blocks = 2;
97  ctx->channel_blocks[1] = CH_UNIT_MONO;
98  break;
99  case 4:
101  ctx->num_channel_blocks = 3;
102  ctx->channel_blocks[0] = CH_UNIT_STEREO;
103  ctx->channel_blocks[1] = CH_UNIT_MONO;
104  ctx->channel_blocks[2] = CH_UNIT_MONO;
105  break;
106  case 6:
108  ctx->num_channel_blocks = 4;
109  ctx->channel_blocks[0] = CH_UNIT_STEREO;
110  ctx->channel_blocks[1] = CH_UNIT_MONO;
111  ctx->channel_blocks[2] = CH_UNIT_STEREO;
112  ctx->channel_blocks[3] = CH_UNIT_MONO;
113  break;
114  case 7:
116  ctx->num_channel_blocks = 5;
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  ctx->channel_blocks[4] = CH_UNIT_MONO;
122  break;
123  case 8:
125  ctx->num_channel_blocks = 5;
126  ctx->channel_blocks[0] = CH_UNIT_STEREO;
127  ctx->channel_blocks[1] = CH_UNIT_MONO;
128  ctx->channel_blocks[2] = CH_UNIT_STEREO;
129  ctx->channel_blocks[3] = CH_UNIT_STEREO;
130  ctx->channel_blocks[4] = CH_UNIT_MONO;
131  break;
132  default:
133  av_log(avctx, AV_LOG_ERROR,
134  "Unsupported channel count: %d!\n", avctx->channels);
135  return AVERROR_INVALIDDATA;
136  }
137 
138  return 0;
139 }
140 
142 {
143  ATRAC3PContext *ctx = avctx->priv_data;
144  int i, ch, ret;
145 
146  if (!avctx->block_align) {
147  av_log(avctx, AV_LOG_ERROR, "block_align is not set\n");
148  return AVERROR(EINVAL);
149  }
150 
152 
154 
155  /* initialize IPQF */
156  ff_mdct_init(&ctx->ipqf_dct_ctx, 5, 1, 32.0 / 32768.0);
157 
158  ff_atrac3p_init_imdct(avctx, &ctx->mdct_ctx);
159 
161 
163 
164  if ((ret = set_channel_params(ctx, avctx)) < 0)
165  return ret;
166 
167  ctx->my_channel_layout = avctx->channel_layout;
168 
169  ctx->ch_units = av_mallocz(sizeof(*ctx->ch_units) *
170  ctx->num_channel_blocks);
171  if (!ctx->ch_units) {
172  atrac3p_decode_close(avctx);
173  return AVERROR(ENOMEM);
174  }
175 
176  for (i = 0; i < ctx->num_channel_blocks; i++) {
177  for (ch = 0; ch < 2; ch++) {
178  ctx->ch_units[i].channels[ch].ch_num = ch;
179  ctx->ch_units[i].channels[ch].wnd_shape = &ctx->ch_units[i].channels[ch].wnd_shape_hist[0][0];
180  ctx->ch_units[i].channels[ch].wnd_shape_prev = &ctx->ch_units[i].channels[ch].wnd_shape_hist[1][0];
181  ctx->ch_units[i].channels[ch].gain_data = &ctx->ch_units[i].channels[ch].gain_data_hist[0][0];
182  ctx->ch_units[i].channels[ch].gain_data_prev = &ctx->ch_units[i].channels[ch].gain_data_hist[1][0];
183  ctx->ch_units[i].channels[ch].tones_info = &ctx->ch_units[i].channels[ch].tones_info_hist[0][0];
184  ctx->ch_units[i].channels[ch].tones_info_prev = &ctx->ch_units[i].channels[ch].tones_info_hist[1][0];
185  }
186 
187  ctx->ch_units[i].waves_info = &ctx->ch_units[i].wave_synth_hist[0];
188  ctx->ch_units[i].waves_info_prev = &ctx->ch_units[i].wave_synth_hist[1];
189  }
190 
192 
193  return 0;
194 }
195 
197  float out[2][ATRAC3P_FRAME_SAMPLES],
198  int num_channels,
199  AVCodecContext *avctx)
200 {
201  int i, sb, ch, qu, nspeclines, RNG_index;
202  float *dst, q;
203  int16_t *src;
204  /* calculate RNG table index for each subband */
205  int sb_RNG_index[ATRAC3P_SUBBANDS] = { 0 };
206 
207  if (ctx->mute_flag) {
208  for (ch = 0; ch < num_channels; ch++)
209  memset(out[ch], 0, ATRAC3P_FRAME_SAMPLES * sizeof(*out[ch]));
210  return;
211  }
212 
213  for (qu = 0, RNG_index = 0; qu < ctx->used_quant_units; qu++)
214  RNG_index += ctx->channels[0].qu_sf_idx[qu] +
215  ctx->channels[1].qu_sf_idx[qu];
216 
217  for (sb = 0; sb < ctx->num_coded_subbands; sb++, RNG_index += 128)
218  sb_RNG_index[sb] = RNG_index & 0x3FC;
219 
220  /* inverse quant and power compensation */
221  for (ch = 0; ch < num_channels; ch++) {
222  /* clear channel's residual spectrum */
223  memset(out[ch], 0, ATRAC3P_FRAME_SAMPLES * sizeof(*out[ch]));
224 
225  for (qu = 0; qu < ctx->used_quant_units; qu++) {
226  src = &ctx->channels[ch].spectrum[ff_atrac3p_qu_to_spec_pos[qu]];
227  dst = &out[ch][ff_atrac3p_qu_to_spec_pos[qu]];
228  nspeclines = ff_atrac3p_qu_to_spec_pos[qu + 1] -
229  ff_atrac3p_qu_to_spec_pos[qu];
230 
231  if (ctx->channels[ch].qu_wordlen[qu] > 0) {
232  q = ff_atrac3p_sf_tab[ctx->channels[ch].qu_sf_idx[qu]] *
234  for (i = 0; i < nspeclines; i++)
235  dst[i] = src[i] * q;
236  }
237  }
238 
239  for (sb = 0; sb < ctx->num_coded_subbands; sb++)
240  ff_atrac3p_power_compensation(ctx, ch, &out[ch][0],
241  sb_RNG_index[sb], sb);
242  }
243 
244  if (ctx->unit_type == CH_UNIT_STEREO) {
245  for (sb = 0; sb < ctx->num_coded_subbands; sb++) {
246  if (ctx->swap_channels[sb]) {
247  for (i = 0; i < ATRAC3P_SUBBAND_SAMPLES; i++)
248  FFSWAP(float, out[0][sb * ATRAC3P_SUBBAND_SAMPLES + i],
249  out[1][sb * ATRAC3P_SUBBAND_SAMPLES + i]);
250  }
251 
252  /* flip coefficients' sign if requested */
253  if (ctx->negate_coeffs[sb])
254  for (i = 0; i < ATRAC3P_SUBBAND_SAMPLES; i++)
255  out[1][sb * ATRAC3P_SUBBAND_SAMPLES + i] = -(out[1][sb * ATRAC3P_SUBBAND_SAMPLES + i]);
256  }
257  }
258 }
259 
261  int num_channels, AVCodecContext *avctx)
262 {
263  int ch, sb;
264 
265  for (ch = 0; ch < num_channels; ch++) {
266  for (sb = 0; sb < ch_unit->num_subbands; sb++) {
267  /* inverse transform and windowing */
268  ff_atrac3p_imdct(&ctx->fdsp, &ctx->mdct_ctx,
269  &ctx->samples[ch][sb * ATRAC3P_SUBBAND_SAMPLES],
270  &ctx->mdct_buf[ch][sb * ATRAC3P_SUBBAND_SAMPLES],
271  (ch_unit->channels[ch].wnd_shape_prev[sb] << 1) +
272  ch_unit->channels[ch].wnd_shape[sb], sb);
273 
274  /* gain compensation and overlapping */
276  &ctx->mdct_buf[ch][sb * ATRAC3P_SUBBAND_SAMPLES],
277  &ch_unit->prev_buf[ch][sb * ATRAC3P_SUBBAND_SAMPLES],
278  &ch_unit->channels[ch].gain_data_prev[sb],
279  &ch_unit->channels[ch].gain_data[sb],
280  ATRAC3P_SUBBAND_SAMPLES,
281  &ctx->time_buf[ch][sb * ATRAC3P_SUBBAND_SAMPLES]);
282  }
283 
284  /* zero unused subbands in both output and overlapping buffers */
285  memset(&ch_unit->prev_buf[ch][ch_unit->num_subbands * ATRAC3P_SUBBAND_SAMPLES],
286  0,
287  (ATRAC3P_SUBBANDS - ch_unit->num_subbands) *
288  ATRAC3P_SUBBAND_SAMPLES *
289  sizeof(ch_unit->prev_buf[ch][ch_unit->num_subbands * ATRAC3P_SUBBAND_SAMPLES]));
290  memset(&ctx->time_buf[ch][ch_unit->num_subbands * ATRAC3P_SUBBAND_SAMPLES],
291  0,
292  (ATRAC3P_SUBBANDS - ch_unit->num_subbands) *
293  ATRAC3P_SUBBAND_SAMPLES *
294  sizeof(ctx->time_buf[ch][ch_unit->num_subbands * ATRAC3P_SUBBAND_SAMPLES]));
295 
296  /* resynthesize and add tonal signal */
297  if (ch_unit->waves_info->tones_present ||
298  ch_unit->waves_info_prev->tones_present) {
299  for (sb = 0; sb < ch_unit->num_subbands; sb++)
300  if (ch_unit->channels[ch].tones_info[sb].num_wavs ||
301  ch_unit->channels[ch].tones_info_prev[sb].num_wavs) {
302  ff_atrac3p_generate_tones(ch_unit, &ctx->fdsp, ch, sb,
303  &ctx->time_buf[ch][sb * 128]);
304  }
305  }
306 
307  /* subband synthesis and acoustic signal output */
308  ff_atrac3p_ipqf(&ctx->ipqf_dct_ctx, &ch_unit->ipqf_ctx[ch],
309  &ctx->time_buf[ch][0], &ctx->outp_buf[ch][0]);
310  }
311 
312  /* swap window shape and gain control buffers. */
313  for (ch = 0; ch < num_channels; ch++) {
314  FFSWAP(uint8_t *, ch_unit->channels[ch].wnd_shape,
315  ch_unit->channels[ch].wnd_shape_prev);
316  FFSWAP(AtracGainInfo *, ch_unit->channels[ch].gain_data,
317  ch_unit->channels[ch].gain_data_prev);
318  FFSWAP(Atrac3pWavesData *, ch_unit->channels[ch].tones_info,
319  ch_unit->channels[ch].tones_info_prev);
320  }
321 
323 }
324 
325 static int atrac3p_decode_frame(AVCodecContext *avctx, void *data,
326  int *got_frame_ptr, AVPacket *avpkt)
327 {
328  ATRAC3PContext *ctx = avctx->priv_data;
329  AVFrame *frame = data;
330  int i, ret, ch_unit_id, ch_block = 0, out_ch_index = 0, channels_to_process;
331  float **samples_p = (float **)frame->extended_data;
332 
334  if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) {
335  av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
336  return ret;
337  }
338 
339  if ((ret = init_get_bits8(&ctx->gb, avpkt->data, avpkt->size)) < 0)
340  return ret;
341 
342  if (get_bits1(&ctx->gb)) {
343  av_log(avctx, AV_LOG_ERROR, "Invalid start bit!\n");
344  return AVERROR_INVALIDDATA;
345  }
346 
347  while (get_bits_left(&ctx->gb) >= 2 &&
348  (ch_unit_id = get_bits(&ctx->gb, 2)) != CH_UNIT_TERMINATOR) {
349  if (ch_unit_id == CH_UNIT_EXTENSION) {
350  avpriv_report_missing_feature(avctx, "Channel unit extension");
351  return AVERROR_PATCHWELCOME;
352  }
353  if (ch_block >= ctx->num_channel_blocks ||
354  ctx->channel_blocks[ch_block] != ch_unit_id) {
355  av_log(avctx, AV_LOG_ERROR,
356  "Frame data doesn't match channel configuration!\n");
357  return AVERROR_INVALIDDATA;
358  }
359 
360  ctx->ch_units[ch_block].unit_type = ch_unit_id;
361  channels_to_process = ch_unit_id + 1;
362 
363  if ((ret = ff_atrac3p_decode_channel_unit(&ctx->gb,
364  &ctx->ch_units[ch_block],
365  channels_to_process,
366  avctx)) < 0)
367  return ret;
368 
369  decode_residual_spectrum(&ctx->ch_units[ch_block], ctx->samples,
370  channels_to_process, avctx);
371  reconstruct_frame(ctx, &ctx->ch_units[ch_block],
372  channels_to_process, avctx);
373 
374  for (i = 0; i < channels_to_process; i++)
375  memcpy(samples_p[out_ch_index + i], ctx->outp_buf[i],
376  ATRAC3P_FRAME_SAMPLES * sizeof(**samples_p));
377 
378  ch_block++;
379  out_ch_index += channels_to_process;
380  }
381 
382  *got_frame_ptr = 1;
383 
384  return avctx->block_align;
385 }
386 
388  .name = "atrac3plus",
389  .long_name = NULL_IF_CONFIG_SMALL("ATRAC3+ (Adaptive TRansform Acoustic Coding 3+)"),
390  .type = AVMEDIA_TYPE_AUDIO,
391  .id = AV_CODEC_ID_ATRAC3P,
392  .priv_data_size = sizeof(ATRAC3PContext),
396 };