2 * ATRAC3+ compatible decoder
4 * Copyright (c) 2010-2013 Maxim Poliakovski
6 * This file is part of FFmpeg.
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.
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.
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
25 * Sony ATRAC3+ compatible decoder.
27 * Container formats used to store its data:
28 * RIFF WAV (.at3) and Sony OpenMG (.oma, .aa3).
30 * Technical description of this codec can be found here:
31 * http://wiki.multimedia.cx/index.php?title=ATRAC3plus
33 * Kudos to Benjamin Larsson and Michael Karcher
34 * for their precious technical help!
40 #include "libavutil/channel_layout.h"
41 #include "libavutil/float_dsp.h"
46 #include "atrac3plus.h"
48 typedef struct ATRAC3PContext {
50 AVFloatDSPContext *fdsp;
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];
57 AtracGCContext gainc_ctx; ///< gain compensation context
59 FFTContext ipqf_dct_ctx; ///< IDCT context used by IPQF
61 Atrac3pChanUnitCtx *ch_units; ///< global channel units
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
68 static av_cold int atrac3p_decode_close(AVCodecContext *avctx)
70 ATRAC3PContext *ctx = avctx->priv_data;
72 av_freep(&ctx->ch_units);
75 ff_mdct_end(&ctx->mdct_ctx);
76 ff_mdct_end(&ctx->ipqf_dct_ctx);
81 static av_cold int set_channel_params(ATRAC3PContext *ctx,
82 AVCodecContext *avctx)
84 memset(ctx->channel_blocks, 0, sizeof(ctx->channel_blocks));
86 switch (avctx->channels) {
88 if (avctx->channel_layout != AV_CH_FRONT_LEFT)
89 avctx->channel_layout = AV_CH_LAYOUT_MONO;
91 ctx->num_channel_blocks = 1;
92 ctx->channel_blocks[0] = CH_UNIT_MONO;
95 avctx->channel_layout = AV_CH_LAYOUT_STEREO;
96 ctx->num_channel_blocks = 1;
97 ctx->channel_blocks[0] = CH_UNIT_STEREO;
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;
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;
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;
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;
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;
139 av_log(avctx, AV_LOG_ERROR,
140 "Unsupported channel count: %d!\n", avctx->channels);
141 return AVERROR_INVALIDDATA;
147 static av_cold int atrac3p_decode_init(AVCodecContext *avctx)
149 ATRAC3PContext *ctx = avctx->priv_data;
152 if (!avctx->block_align) {
153 av_log(avctx, AV_LOG_ERROR, "block_align is not set\n");
154 return AVERROR(EINVAL);
157 ff_atrac3p_init_vlcs();
159 /* initialize IPQF */
160 ff_mdct_init(&ctx->ipqf_dct_ctx, 5, 1, 32.0 / 32768.0);
162 ff_atrac3p_init_imdct(avctx, &ctx->mdct_ctx);
164 ff_atrac_init_gain_compensation(&ctx->gainc_ctx, 6, 2);
166 ff_atrac3p_init_wave_synth();
168 if ((ret = set_channel_params(ctx, avctx)) < 0)
171 ctx->my_channel_layout = avctx->channel_layout;
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);
176 if (!ctx->ch_units || !ctx->fdsp) {
177 atrac3p_decode_close(avctx);
178 return AVERROR(ENOMEM);
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];
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];
196 avctx->sample_fmt = AV_SAMPLE_FMT_FLTP;
201 static void decode_residual_spectrum(Atrac3pChanUnitCtx *ctx,
202 float out[2][ATRAC3P_FRAME_SAMPLES],
204 AVCodecContext *avctx)
206 int i, sb, ch, qu, nspeclines, RNG_index;
209 /* calculate RNG table index for each subband */
210 int sb_RNG_index[ATRAC3P_SUBBANDS] = { 0 };
212 if (ctx->mute_flag) {
213 for (ch = 0; ch < num_channels; ch++)
214 memset(out[ch], 0, ATRAC3P_FRAME_SAMPLES * sizeof(*out[ch]));
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];
222 for (sb = 0; sb < ctx->num_coded_subbands; sb++, RNG_index += 128)
223 sb_RNG_index[sb] = RNG_index & 0x3FC;
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]));
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];
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++)
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);
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]);
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]);
265 static void reconstruct_frame(ATRAC3PContext *ctx, Atrac3pChanUnitCtx *ch_unit,
266 int num_channels, AVCodecContext *avctx)
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);
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]);
289 /* zero unused subbands in both output and overlapping buffers */
290 memset(&ch_unit->prev_buf[ch][ch_unit->num_subbands * ATRAC3P_SUBBAND_SAMPLES],
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],
297 (ATRAC3P_SUBBANDS - ch_unit->num_subbands) *
298 ATRAC3P_SUBBAND_SAMPLES *
299 sizeof(ctx->time_buf[ch][ch_unit->num_subbands * ATRAC3P_SUBBAND_SAMPLES]));
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]);
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]);
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);
327 FFSWAP(Atrac3pWaveSynthParams *, ch_unit->waves_info, ch_unit->waves_info_prev);
330 static int atrac3p_decode_frame(AVCodecContext *avctx, void *data,
331 int *got_frame_ptr, AVPacket *avpkt)
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;
338 frame->nb_samples = ATRAC3P_FRAME_SAMPLES;
339 if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
342 if ((ret = init_get_bits8(&ctx->gb, avpkt->data, avpkt->size)) < 0)
345 if (get_bits1(&ctx->gb)) {
346 av_log(avctx, AV_LOG_ERROR, "Invalid start bit!\n");
347 return AVERROR_INVALIDDATA;
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;
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;
363 ctx->ch_units[ch_block].unit_type = ch_unit_id;
364 channels_to_process = ch_unit_id + 1;
366 if ((ret = ff_atrac3p_decode_channel_unit(&ctx->gb,
367 &ctx->ch_units[ch_block],
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);
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));
382 out_ch_index += channels_to_process;
387 return avctx->codec_id == AV_CODEC_ID_ATRAC3P ? FFMIN(avctx->block_align, avpkt->size) : avpkt->size;
390 AVCodec 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,
402 AVCodec 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,