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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 | ||
48 | typedef 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 | ||
68 | static av_cold int atrac3p_decode_close(AVCodecContext *avctx) | |
69 | { | |
70 | av_free(((ATRAC3PContext *)(avctx->priv_data))->ch_units); | |
71 | ||
72 | return 0; | |
73 | } | |
74 | ||
75 | static av_cold int set_channel_params(ATRAC3PContext *ctx, | |
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) | |
83 | avctx->channel_layout = AV_CH_LAYOUT_MONO; | |
84 | ||
85 | ctx->num_channel_blocks = 1; | |
86 | ctx->channel_blocks[0] = CH_UNIT_MONO; | |
87 | break; | |
88 | case 2: | |
89 | avctx->channel_layout = AV_CH_LAYOUT_STEREO; | |
90 | ctx->num_channel_blocks = 1; | |
91 | ctx->channel_blocks[0] = CH_UNIT_STEREO; | |
92 | break; | |
93 | case 3: | |
94 | avctx->channel_layout = AV_CH_LAYOUT_SURROUND; | |
95 | ctx->num_channel_blocks = 2; | |
96 | ctx->channel_blocks[0] = CH_UNIT_STEREO; | |
97 | ctx->channel_blocks[1] = CH_UNIT_MONO; | |
98 | break; | |
99 | case 4: | |
100 | avctx->channel_layout = AV_CH_LAYOUT_4POINT0; | |
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: | |
107 | avctx->channel_layout = AV_CH_LAYOUT_5POINT1_BACK; | |
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: | |
115 | avctx->channel_layout = AV_CH_LAYOUT_6POINT1_BACK; | |
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: | |
124 | avctx->channel_layout = AV_CH_LAYOUT_7POINT1; | |
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 | ||
141 | static av_cold int atrac3p_decode_init(AVCodecContext *avctx) | |
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 | ||
151 | ff_atrac3p_init_vlcs(); | |
152 | ||
153 | avpriv_float_dsp_init(&ctx->fdsp, avctx->flags & CODEC_FLAG_BITEXACT); | |
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 | ||
160 | ff_atrac_init_gain_compensation(&ctx->gainc_ctx, 6, 2); | |
161 | ||
162 | ff_atrac3p_init_wave_synth(); | |
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_array(ctx->num_channel_blocks, sizeof(*ctx->ch_units)); | |
170 | ||
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 | ||
191 | avctx->sample_fmt = AV_SAMPLE_FMT_FLTP; | |
192 | ||
193 | return 0; | |
194 | } | |
195 | ||
196 | static void decode_residual_spectrum(Atrac3pChanUnitCtx *ctx, | |
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]] * | |
233 | ff_atrac3p_mant_tab[ctx->channels[ch].qu_wordlen[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 | ||
260 | static void reconstruct_frame(ATRAC3PContext *ctx, Atrac3pChanUnitCtx *ch_unit, | |
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 */ | |
275 | ff_atrac_gain_compensation(&ctx->gainc_ctx, | |
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 | ||
322 | FFSWAP(Atrac3pWaveSynthParams *, ch_unit->waves_info, ch_unit->waves_info_prev); | |
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 | ||
333 | frame->nb_samples = ATRAC3P_FRAME_SAMPLES; | |
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 | ||
387 | AVCodec ff_atrac3p_decoder = { | |
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), | |
393 | .init = atrac3p_decode_init, | |
394 | .close = atrac3p_decode_close, | |
395 | .decode = atrac3p_decode_frame, | |
396 | }; |