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path: root/libavcodec/atrac3plusdec.c (plain)
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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
40#include "libavutil/channel_layout.h"
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
48typedef struct ATRAC3PContext {
49 GetBitContext gb;
50 AVFloatDSPContext *fdsp;
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
55 DECLARE_ALIGNED(32, float, outp_buf)[2][ATRAC3P_FRAME_SAMPLES];
56
57 AtracGCContext gainc_ctx; ///< gain compensation context
58 FFTContext mdct_ctx;
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
66} ATRAC3PContext;
67
68static av_cold int atrac3p_decode_close(AVCodecContext *avctx)
69{
70 ATRAC3PContext *ctx = avctx->priv_data;
71
72 av_freep(&ctx->ch_units);
73 av_freep(&ctx->fdsp);
74
75 ff_mdct_end(&ctx->mdct_ctx);
76 ff_mdct_end(&ctx->ipqf_dct_ctx);
77
78 return 0;
79}
80
81static av_cold int set_channel_params(ATRAC3PContext *ctx,
82 AVCodecContext *avctx)
83{
84 memset(ctx->channel_blocks, 0, sizeof(ctx->channel_blocks));
85
86 switch (avctx->channels) {
87 case 1:
88 if (avctx->channel_layout != AV_CH_FRONT_LEFT)
89 avctx->channel_layout = AV_CH_LAYOUT_MONO;
90
91 ctx->num_channel_blocks = 1;
92 ctx->channel_blocks[0] = CH_UNIT_MONO;
93 break;
94 case 2:
95 avctx->channel_layout = AV_CH_LAYOUT_STEREO;
96 ctx->num_channel_blocks = 1;
97 ctx->channel_blocks[0] = CH_UNIT_STEREO;
98 break;
99 case 3:
100 avctx->channel_layout = AV_CH_LAYOUT_SURROUND;
101 ctx->num_channel_blocks = 2;
102 ctx->channel_blocks[0] = CH_UNIT_STEREO;
103 ctx->channel_blocks[1] = CH_UNIT_MONO;
104 break;
105 case 4:
106 avctx->channel_layout = AV_CH_LAYOUT_4POINT0;
107 ctx->num_channel_blocks = 3;
108 ctx->channel_blocks[0] = CH_UNIT_STEREO;
109 ctx->channel_blocks[1] = CH_UNIT_MONO;
110 ctx->channel_blocks[2] = CH_UNIT_MONO;
111 break;
112 case 6:
113 avctx->channel_layout = AV_CH_LAYOUT_5POINT1_BACK;
114 ctx->num_channel_blocks = 4;
115 ctx->channel_blocks[0] = CH_UNIT_STEREO;
116 ctx->channel_blocks[1] = CH_UNIT_MONO;
117 ctx->channel_blocks[2] = CH_UNIT_STEREO;
118 ctx->channel_blocks[3] = CH_UNIT_MONO;
119 break;
120 case 7:
121 avctx->channel_layout = AV_CH_LAYOUT_6POINT1_BACK;
122 ctx->num_channel_blocks = 5;
123 ctx->channel_blocks[0] = CH_UNIT_STEREO;
124 ctx->channel_blocks[1] = CH_UNIT_MONO;
125 ctx->channel_blocks[2] = CH_UNIT_STEREO;
126 ctx->channel_blocks[3] = CH_UNIT_MONO;
127 ctx->channel_blocks[4] = CH_UNIT_MONO;
128 break;
129 case 8:
130 avctx->channel_layout = AV_CH_LAYOUT_7POINT1;
131 ctx->num_channel_blocks = 5;
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_STEREO;
136 ctx->channel_blocks[4] = CH_UNIT_MONO;
137 break;
138 default:
139 av_log(avctx, AV_LOG_ERROR,
140 "Unsupported channel count: %d!\n", avctx->channels);
141 return AVERROR_INVALIDDATA;
142 }
143
144 return 0;
145}
146
147static av_cold int atrac3p_decode_init(AVCodecContext *avctx)
148{
149 ATRAC3PContext *ctx = avctx->priv_data;
150 int i, ch, ret;
151
152 if (!avctx->block_align) {
153 av_log(avctx, AV_LOG_ERROR, "block_align is not set\n");
154 return AVERROR(EINVAL);
155 }
156
157 ff_atrac3p_init_vlcs();
158
159 /* initialize IPQF */
160 ff_mdct_init(&ctx->ipqf_dct_ctx, 5, 1, 32.0 / 32768.0);
161
162 ff_atrac3p_init_imdct(avctx, &ctx->mdct_ctx);
163
164 ff_atrac_init_gain_compensation(&ctx->gainc_ctx, 6, 2);
165
166 ff_atrac3p_init_wave_synth();
167
168 if ((ret = set_channel_params(ctx, avctx)) < 0)
169 return ret;
170
171 ctx->my_channel_layout = avctx->channel_layout;
172
173 ctx->ch_units = av_mallocz_array(ctx->num_channel_blocks, sizeof(*ctx->ch_units));
174 ctx->fdsp = avpriv_float_dsp_alloc(avctx->flags & AV_CODEC_FLAG_BITEXACT);
175
176 if (!ctx->ch_units || !ctx->fdsp) {
177 atrac3p_decode_close(avctx);
178 return AVERROR(ENOMEM);
179 }
180
181 for (i = 0; i < ctx->num_channel_blocks; i++) {
182 for (ch = 0; ch < 2; ch++) {
183 ctx->ch_units[i].channels[ch].ch_num = ch;
184 ctx->ch_units[i].channels[ch].wnd_shape = &ctx->ch_units[i].channels[ch].wnd_shape_hist[0][0];
185 ctx->ch_units[i].channels[ch].wnd_shape_prev = &ctx->ch_units[i].channels[ch].wnd_shape_hist[1][0];
186 ctx->ch_units[i].channels[ch].gain_data = &ctx->ch_units[i].channels[ch].gain_data_hist[0][0];
187 ctx->ch_units[i].channels[ch].gain_data_prev = &ctx->ch_units[i].channels[ch].gain_data_hist[1][0];
188 ctx->ch_units[i].channels[ch].tones_info = &ctx->ch_units[i].channels[ch].tones_info_hist[0][0];
189 ctx->ch_units[i].channels[ch].tones_info_prev = &ctx->ch_units[i].channels[ch].tones_info_hist[1][0];
190 }
191
192 ctx->ch_units[i].waves_info = &ctx->ch_units[i].wave_synth_hist[0];
193 ctx->ch_units[i].waves_info_prev = &ctx->ch_units[i].wave_synth_hist[1];
194 }
195
196 avctx->sample_fmt = AV_SAMPLE_FMT_FLTP;
197
198 return 0;
199}
200
201static void decode_residual_spectrum(Atrac3pChanUnitCtx *ctx,
202 float out[2][ATRAC3P_FRAME_SAMPLES],
203 int num_channels,
204 AVCodecContext *avctx)
205{
206 int i, sb, ch, qu, nspeclines, RNG_index;
207 float *dst, q;
208 int16_t *src;
209 /* calculate RNG table index for each subband */
210 int sb_RNG_index[ATRAC3P_SUBBANDS] = { 0 };
211
212 if (ctx->mute_flag) {
213 for (ch = 0; ch < num_channels; ch++)
214 memset(out[ch], 0, ATRAC3P_FRAME_SAMPLES * sizeof(*out[ch]));
215 return;
216 }
217
218 for (qu = 0, RNG_index = 0; qu < ctx->used_quant_units; qu++)
219 RNG_index += ctx->channels[0].qu_sf_idx[qu] +
220 ctx->channels[1].qu_sf_idx[qu];
221
222 for (sb = 0; sb < ctx->num_coded_subbands; sb++, RNG_index += 128)
223 sb_RNG_index[sb] = RNG_index & 0x3FC;
224
225 /* inverse quant and power compensation */
226 for (ch = 0; ch < num_channels; ch++) {
227 /* clear channel's residual spectrum */
228 memset(out[ch], 0, ATRAC3P_FRAME_SAMPLES * sizeof(*out[ch]));
229
230 for (qu = 0; qu < ctx->used_quant_units; qu++) {
231 src = &ctx->channels[ch].spectrum[ff_atrac3p_qu_to_spec_pos[qu]];
232 dst = &out[ch][ff_atrac3p_qu_to_spec_pos[qu]];
233 nspeclines = ff_atrac3p_qu_to_spec_pos[qu + 1] -
234 ff_atrac3p_qu_to_spec_pos[qu];
235
236 if (ctx->channels[ch].qu_wordlen[qu] > 0) {
237 q = ff_atrac3p_sf_tab[ctx->channels[ch].qu_sf_idx[qu]] *
238 ff_atrac3p_mant_tab[ctx->channels[ch].qu_wordlen[qu]];
239 for (i = 0; i < nspeclines; i++)
240 dst[i] = src[i] * q;
241 }
242 }
243
244 for (sb = 0; sb < ctx->num_coded_subbands; sb++)
245 ff_atrac3p_power_compensation(ctx, ch, &out[ch][0],
246 sb_RNG_index[sb], sb);
247 }
248
249 if (ctx->unit_type == CH_UNIT_STEREO) {
250 for (sb = 0; sb < ctx->num_coded_subbands; sb++) {
251 if (ctx->swap_channels[sb]) {
252 for (i = 0; i < ATRAC3P_SUBBAND_SAMPLES; i++)
253 FFSWAP(float, out[0][sb * ATRAC3P_SUBBAND_SAMPLES + i],
254 out[1][sb * ATRAC3P_SUBBAND_SAMPLES + i]);
255 }
256
257 /* flip coefficients' sign if requested */
258 if (ctx->negate_coeffs[sb])
259 for (i = 0; i < ATRAC3P_SUBBAND_SAMPLES; i++)
260 out[1][sb * ATRAC3P_SUBBAND_SAMPLES + i] = -(out[1][sb * ATRAC3P_SUBBAND_SAMPLES + i]);
261 }
262 }
263}
264
265static void reconstruct_frame(ATRAC3PContext *ctx, Atrac3pChanUnitCtx *ch_unit,
266 int num_channels, AVCodecContext *avctx)
267{
268 int ch, sb;
269
270 for (ch = 0; ch < num_channels; ch++) {
271 for (sb = 0; sb < ch_unit->num_subbands; sb++) {
272 /* inverse transform and windowing */
273 ff_atrac3p_imdct(ctx->fdsp, &ctx->mdct_ctx,
274 &ctx->samples[ch][sb * ATRAC3P_SUBBAND_SAMPLES],
275 &ctx->mdct_buf[ch][sb * ATRAC3P_SUBBAND_SAMPLES],
276 (ch_unit->channels[ch].wnd_shape_prev[sb] << 1) +
277 ch_unit->channels[ch].wnd_shape[sb], sb);
278
279 /* gain compensation and overlapping */
280 ff_atrac_gain_compensation(&ctx->gainc_ctx,
281 &ctx->mdct_buf[ch][sb * ATRAC3P_SUBBAND_SAMPLES],
282 &ch_unit->prev_buf[ch][sb * ATRAC3P_SUBBAND_SAMPLES],
283 &ch_unit->channels[ch].gain_data_prev[sb],
284 &ch_unit->channels[ch].gain_data[sb],
285 ATRAC3P_SUBBAND_SAMPLES,
286 &ctx->time_buf[ch][sb * ATRAC3P_SUBBAND_SAMPLES]);
287 }
288
289 /* zero unused subbands in both output and overlapping buffers */
290 memset(&ch_unit->prev_buf[ch][ch_unit->num_subbands * ATRAC3P_SUBBAND_SAMPLES],
291 0,
292 (ATRAC3P_SUBBANDS - ch_unit->num_subbands) *
293 ATRAC3P_SUBBAND_SAMPLES *
294 sizeof(ch_unit->prev_buf[ch][ch_unit->num_subbands * ATRAC3P_SUBBAND_SAMPLES]));
295 memset(&ctx->time_buf[ch][ch_unit->num_subbands * ATRAC3P_SUBBAND_SAMPLES],
296 0,
297 (ATRAC3P_SUBBANDS - ch_unit->num_subbands) *
298 ATRAC3P_SUBBAND_SAMPLES *
299 sizeof(ctx->time_buf[ch][ch_unit->num_subbands * ATRAC3P_SUBBAND_SAMPLES]));
300
301 /* resynthesize and add tonal signal */
302 if (ch_unit->waves_info->tones_present ||
303 ch_unit->waves_info_prev->tones_present) {
304 for (sb = 0; sb < ch_unit->num_subbands; sb++)
305 if (ch_unit->channels[ch].tones_info[sb].num_wavs ||
306 ch_unit->channels[ch].tones_info_prev[sb].num_wavs) {
307 ff_atrac3p_generate_tones(ch_unit, ctx->fdsp, ch, sb,
308 &ctx->time_buf[ch][sb * 128]);
309 }
310 }
311
312 /* subband synthesis and acoustic signal output */
313 ff_atrac3p_ipqf(&ctx->ipqf_dct_ctx, &ch_unit->ipqf_ctx[ch],
314 &ctx->time_buf[ch][0], &ctx->outp_buf[ch][0]);
315 }
316
317 /* swap window shape and gain control buffers. */
318 for (ch = 0; ch < num_channels; ch++) {
319 FFSWAP(uint8_t *, ch_unit->channels[ch].wnd_shape,
320 ch_unit->channels[ch].wnd_shape_prev);
321 FFSWAP(AtracGainInfo *, ch_unit->channels[ch].gain_data,
322 ch_unit->channels[ch].gain_data_prev);
323 FFSWAP(Atrac3pWavesData *, ch_unit->channels[ch].tones_info,
324 ch_unit->channels[ch].tones_info_prev);
325 }
326
327 FFSWAP(Atrac3pWaveSynthParams *, ch_unit->waves_info, ch_unit->waves_info_prev);
328}
329
330static int atrac3p_decode_frame(AVCodecContext *avctx, void *data,
331 int *got_frame_ptr, AVPacket *avpkt)
332{
333 ATRAC3PContext *ctx = avctx->priv_data;
334 AVFrame *frame = data;
335 int i, ret, ch_unit_id, ch_block = 0, out_ch_index = 0, channels_to_process;
336 float **samples_p = (float **)frame->extended_data;
337
338 frame->nb_samples = ATRAC3P_FRAME_SAMPLES;
339 if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
340 return ret;
341
342 if ((ret = init_get_bits8(&ctx->gb, avpkt->data, avpkt->size)) < 0)
343 return ret;
344
345 if (get_bits1(&ctx->gb)) {
346 av_log(avctx, AV_LOG_ERROR, "Invalid start bit!\n");
347 return AVERROR_INVALIDDATA;
348 }
349
350 while (get_bits_left(&ctx->gb) >= 2 &&
351 (ch_unit_id = get_bits(&ctx->gb, 2)) != CH_UNIT_TERMINATOR) {
352 if (ch_unit_id == CH_UNIT_EXTENSION) {
353 avpriv_report_missing_feature(avctx, "Channel unit extension");
354 return AVERROR_PATCHWELCOME;
355 }
356 if (ch_block >= ctx->num_channel_blocks ||
357 ctx->channel_blocks[ch_block] != ch_unit_id) {
358 av_log(avctx, AV_LOG_ERROR,
359 "Frame data doesn't match channel configuration!\n");
360 return AVERROR_INVALIDDATA;
361 }
362
363 ctx->ch_units[ch_block].unit_type = ch_unit_id;
364 channels_to_process = ch_unit_id + 1;
365
366 if ((ret = ff_atrac3p_decode_channel_unit(&ctx->gb,
367 &ctx->ch_units[ch_block],
368 channels_to_process,
369 avctx)) < 0)
370 return ret;
371
372 decode_residual_spectrum(&ctx->ch_units[ch_block], ctx->samples,
373 channels_to_process, avctx);
374 reconstruct_frame(ctx, &ctx->ch_units[ch_block],
375 channels_to_process, avctx);
376
377 for (i = 0; i < channels_to_process; i++)
378 memcpy(samples_p[out_ch_index + i], ctx->outp_buf[i],
379 ATRAC3P_FRAME_SAMPLES * sizeof(**samples_p));
380
381 ch_block++;
382 out_ch_index += channels_to_process;
383 }
384
385 *got_frame_ptr = 1;
386
387 return avctx->codec_id == AV_CODEC_ID_ATRAC3P ? FFMIN(avctx->block_align, avpkt->size) : avpkt->size;
388}
389
390AVCodec ff_atrac3p_decoder = {
391 .name = "atrac3plus",
392 .long_name = NULL_IF_CONFIG_SMALL("ATRAC3+ (Adaptive TRansform Acoustic Coding 3+)"),
393 .type = AVMEDIA_TYPE_AUDIO,
394 .id = AV_CODEC_ID_ATRAC3P,
395 .capabilities = AV_CODEC_CAP_DR1,
396 .priv_data_size = sizeof(ATRAC3PContext),
397 .init = atrac3p_decode_init,
398 .close = atrac3p_decode_close,
399 .decode = atrac3p_decode_frame,
400};
401
402AVCodec ff_atrac3pal_decoder = {
403 .name = "atrac3plusal",
404 .long_name = NULL_IF_CONFIG_SMALL("ATRAC3+ AL (Adaptive TRansform Acoustic Coding 3+ Advanced Lossless)"),
405 .type = AVMEDIA_TYPE_AUDIO,
406 .id = AV_CODEC_ID_ATRAC3PAL,
407 .capabilities = AV_CODEC_CAP_DR1,
408 .priv_data_size = sizeof(ATRAC3PContext),
409 .init = atrac3p_decode_init,
410 .close = atrac3p_decode_close,
411 .decode = atrac3p_decode_frame,
412};
413
generated by cgit at 2024-05-17 05:01:45 (GMT)