2 * DCA compatible decoder
3 * Copyright (C) 2004 Gildas Bazin
4 * Copyright (C) 2004 Benjamin Zores
5 * Copyright (C) 2006 Benjamin Larsson
6 * Copyright (C) 2007 Konstantin Shishkov
8 * This file is part of Libav.
10 * Libav is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU Lesser General Public
12 * License as published by the Free Software Foundation; either
13 * version 2.1 of the License, or (at your option) any later version.
15 * Libav is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18 * Lesser General Public License for more details.
20 * You should have received a copy of the GNU Lesser General Public
21 * License along with Libav; if not, write to the Free Software
22 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
29 #include "libavutil/common.h"
30 #include "libavutil/intmath.h"
31 #include "libavutil/intreadwrite.h"
32 #include "libavutil/audioconvert.h"
41 #include "dca_parser.h"
42 #include "synth_filter.h"
44 #include "fmtconvert.h"
52 #define DCA_PRIM_CHANNELS_MAX (7)
53 #define DCA_SUBBANDS (32)
54 #define DCA_ABITS_MAX (32) /* Should be 28 */
55 #define DCA_SUBSUBFRAMES_MAX (4)
56 #define DCA_SUBFRAMES_MAX (16)
57 #define DCA_BLOCKS_MAX (16)
58 #define DCA_LFE_MAX (3)
74 /* these are unconfirmed but should be mostly correct */
75 enum DCAExSSSpeakerMask {
76 DCA_EXSS_FRONT_CENTER = 0x0001,
77 DCA_EXSS_FRONT_LEFT_RIGHT = 0x0002,
78 DCA_EXSS_SIDE_REAR_LEFT_RIGHT = 0x0004,
79 DCA_EXSS_LFE = 0x0008,
80 DCA_EXSS_REAR_CENTER = 0x0010,
81 DCA_EXSS_FRONT_HIGH_LEFT_RIGHT = 0x0020,
82 DCA_EXSS_REAR_LEFT_RIGHT = 0x0040,
83 DCA_EXSS_FRONT_HIGH_CENTER = 0x0080,
84 DCA_EXSS_OVERHEAD = 0x0100,
85 DCA_EXSS_CENTER_LEFT_RIGHT = 0x0200,
86 DCA_EXSS_WIDE_LEFT_RIGHT = 0x0400,
87 DCA_EXSS_SIDE_LEFT_RIGHT = 0x0800,
88 DCA_EXSS_LFE2 = 0x1000,
89 DCA_EXSS_SIDE_HIGH_LEFT_RIGHT = 0x2000,
90 DCA_EXSS_REAR_HIGH_CENTER = 0x4000,
91 DCA_EXSS_REAR_HIGH_LEFT_RIGHT = 0x8000,
94 enum DCAExtensionMask {
95 DCA_EXT_CORE = 0x001, ///< core in core substream
96 DCA_EXT_XXCH = 0x002, ///< XXCh channels extension in core substream
97 DCA_EXT_X96 = 0x004, ///< 96/24 extension in core substream
98 DCA_EXT_XCH = 0x008, ///< XCh channel extension in core substream
99 DCA_EXT_EXSS_CORE = 0x010, ///< core in ExSS (extension substream)
100 DCA_EXT_EXSS_XBR = 0x020, ///< extended bitrate extension in ExSS
101 DCA_EXT_EXSS_XXCH = 0x040, ///< XXCh channels extension in ExSS
102 DCA_EXT_EXSS_X96 = 0x080, ///< 96/24 extension in ExSS
103 DCA_EXT_EXSS_LBR = 0x100, ///< low bitrate component in ExSS
104 DCA_EXT_EXSS_XLL = 0x200, ///< lossless extension in ExSS
107 /* -1 are reserved or unknown */
108 static const int dca_ext_audio_descr_mask[] = {
112 DCA_EXT_XCH | DCA_EXT_X96,
119 /* extensions that reside in core substream */
120 #define DCA_CORE_EXTS (DCA_EXT_XCH | DCA_EXT_XXCH | DCA_EXT_X96)
122 /* Tables for mapping dts channel configurations to libavcodec multichannel api.
123 * Some compromises have been made for special configurations. Most configurations
124 * are never used so complete accuracy is not needed.
126 * L = left, R = right, C = center, S = surround, F = front, R = rear, T = total, OV = overhead.
127 * S -> side, when both rear and back are configured move one of them to the side channel
129 * All 2 channel configurations -> AV_CH_LAYOUT_STEREO
131 static const uint64_t dca_core_channel_layout[] = {
132 AV_CH_FRONT_CENTER, ///< 1, A
133 AV_CH_LAYOUT_STEREO, ///< 2, A + B (dual mono)
134 AV_CH_LAYOUT_STEREO, ///< 2, L + R (stereo)
135 AV_CH_LAYOUT_STEREO, ///< 2, (L + R) + (L - R) (sum-difference)
136 AV_CH_LAYOUT_STEREO, ///< 2, LT + RT (left and right total)
137 AV_CH_LAYOUT_STEREO | AV_CH_FRONT_CENTER, ///< 3, C + L + R
138 AV_CH_LAYOUT_STEREO | AV_CH_BACK_CENTER, ///< 3, L + R + S
139 AV_CH_LAYOUT_STEREO | AV_CH_FRONT_CENTER | AV_CH_BACK_CENTER, ///< 4, C + L + R + S
140 AV_CH_LAYOUT_STEREO | AV_CH_SIDE_LEFT | AV_CH_SIDE_RIGHT, ///< 4, L + R + SL + SR
142 AV_CH_LAYOUT_STEREO | AV_CH_FRONT_CENTER | AV_CH_SIDE_LEFT |
143 AV_CH_SIDE_RIGHT, ///< 5, C + L + R + SL + SR
145 AV_CH_LAYOUT_STEREO | AV_CH_SIDE_LEFT | AV_CH_SIDE_RIGHT |
146 AV_CH_FRONT_LEFT_OF_CENTER | AV_CH_FRONT_RIGHT_OF_CENTER, ///< 6, CL + CR + L + R + SL + SR
148 AV_CH_LAYOUT_STEREO | AV_CH_BACK_LEFT | AV_CH_BACK_RIGHT |
149 AV_CH_FRONT_CENTER | AV_CH_BACK_CENTER, ///< 6, C + L + R + LR + RR + OV
151 AV_CH_FRONT_CENTER | AV_CH_FRONT_RIGHT_OF_CENTER |
152 AV_CH_FRONT_LEFT_OF_CENTER | AV_CH_BACK_CENTER |
153 AV_CH_BACK_LEFT | AV_CH_BACK_RIGHT, ///< 6, CF + CR + LF + RF + LR + RR
155 AV_CH_FRONT_LEFT_OF_CENTER | AV_CH_FRONT_CENTER |
156 AV_CH_FRONT_RIGHT_OF_CENTER | AV_CH_LAYOUT_STEREO |
157 AV_CH_SIDE_LEFT | AV_CH_SIDE_RIGHT, ///< 7, CL + C + CR + L + R + SL + SR
159 AV_CH_FRONT_LEFT_OF_CENTER | AV_CH_FRONT_RIGHT_OF_CENTER |
160 AV_CH_LAYOUT_STEREO | AV_CH_SIDE_LEFT | AV_CH_SIDE_RIGHT |
161 AV_CH_BACK_LEFT | AV_CH_BACK_RIGHT, ///< 8, CL + CR + L + R + SL1 + SL2 + SR1 + SR2
163 AV_CH_FRONT_LEFT_OF_CENTER | AV_CH_FRONT_CENTER |
164 AV_CH_FRONT_RIGHT_OF_CENTER | AV_CH_LAYOUT_STEREO |
165 AV_CH_SIDE_LEFT | AV_CH_BACK_CENTER | AV_CH_SIDE_RIGHT, ///< 8, CL + C + CR + L + R + SL + S + SR
168 static const int8_t dca_lfe_index[] = {
169 1, 2, 2, 2, 2, 3, 2, 3, 2, 3, 2, 3, 1, 3, 2, 3
172 static const int8_t dca_channel_reorder_lfe[][9] = {
173 { 0, -1, -1, -1, -1, -1, -1, -1, -1},
174 { 0, 1, -1, -1, -1, -1, -1, -1, -1},
175 { 0, 1, -1, -1, -1, -1, -1, -1, -1},
176 { 0, 1, -1, -1, -1, -1, -1, -1, -1},
177 { 0, 1, -1, -1, -1, -1, -1, -1, -1},
178 { 2, 0, 1, -1, -1, -1, -1, -1, -1},
179 { 0, 1, 3, -1, -1, -1, -1, -1, -1},
180 { 2, 0, 1, 4, -1, -1, -1, -1, -1},
181 { 0, 1, 3, 4, -1, -1, -1, -1, -1},
182 { 2, 0, 1, 4, 5, -1, -1, -1, -1},
183 { 3, 4, 0, 1, 5, 6, -1, -1, -1},
184 { 2, 0, 1, 4, 5, 6, -1, -1, -1},
185 { 0, 6, 4, 5, 2, 3, -1, -1, -1},
186 { 4, 2, 5, 0, 1, 6, 7, -1, -1},
187 { 5, 6, 0, 1, 7, 3, 8, 4, -1},
188 { 4, 2, 5, 0, 1, 6, 8, 7, -1},
191 static const int8_t dca_channel_reorder_lfe_xch[][9] = {
192 { 0, 2, -1, -1, -1, -1, -1, -1, -1},
193 { 0, 1, 3, -1, -1, -1, -1, -1, -1},
194 { 0, 1, 3, -1, -1, -1, -1, -1, -1},
195 { 0, 1, 3, -1, -1, -1, -1, -1, -1},
196 { 0, 1, 3, -1, -1, -1, -1, -1, -1},
197 { 2, 0, 1, 4, -1, -1, -1, -1, -1},
198 { 0, 1, 3, 4, -1, -1, -1, -1, -1},
199 { 2, 0, 1, 4, 5, -1, -1, -1, -1},
200 { 0, 1, 4, 5, 3, -1, -1, -1, -1},
201 { 2, 0, 1, 5, 6, 4, -1, -1, -1},
202 { 3, 4, 0, 1, 6, 7, 5, -1, -1},
203 { 2, 0, 1, 4, 5, 6, 7, -1, -1},
204 { 0, 6, 4, 5, 2, 3, 7, -1, -1},
205 { 4, 2, 5, 0, 1, 7, 8, 6, -1},
206 { 5, 6, 0, 1, 8, 3, 9, 4, 7},
207 { 4, 2, 5, 0, 1, 6, 9, 8, 7},
210 static const int8_t dca_channel_reorder_nolfe[][9] = {
211 { 0, -1, -1, -1, -1, -1, -1, -1, -1},
212 { 0, 1, -1, -1, -1, -1, -1, -1, -1},
213 { 0, 1, -1, -1, -1, -1, -1, -1, -1},
214 { 0, 1, -1, -1, -1, -1, -1, -1, -1},
215 { 0, 1, -1, -1, -1, -1, -1, -1, -1},
216 { 2, 0, 1, -1, -1, -1, -1, -1, -1},
217 { 0, 1, 2, -1, -1, -1, -1, -1, -1},
218 { 2, 0, 1, 3, -1, -1, -1, -1, -1},
219 { 0, 1, 2, 3, -1, -1, -1, -1, -1},
220 { 2, 0, 1, 3, 4, -1, -1, -1, -1},
221 { 2, 3, 0, 1, 4, 5, -1, -1, -1},
222 { 2, 0, 1, 3, 4, 5, -1, -1, -1},
223 { 0, 5, 3, 4, 1, 2, -1, -1, -1},
224 { 3, 2, 4, 0, 1, 5, 6, -1, -1},
225 { 4, 5, 0, 1, 6, 2, 7, 3, -1},
226 { 3, 2, 4, 0, 1, 5, 7, 6, -1},
229 static const int8_t dca_channel_reorder_nolfe_xch[][9] = {
230 { 0, 1, -1, -1, -1, -1, -1, -1, -1},
231 { 0, 1, 2, -1, -1, -1, -1, -1, -1},
232 { 0, 1, 2, -1, -1, -1, -1, -1, -1},
233 { 0, 1, 2, -1, -1, -1, -1, -1, -1},
234 { 0, 1, 2, -1, -1, -1, -1, -1, -1},
235 { 2, 0, 1, 3, -1, -1, -1, -1, -1},
236 { 0, 1, 2, 3, -1, -1, -1, -1, -1},
237 { 2, 0, 1, 3, 4, -1, -1, -1, -1},
238 { 0, 1, 3, 4, 2, -1, -1, -1, -1},
239 { 2, 0, 1, 4, 5, 3, -1, -1, -1},
240 { 2, 3, 0, 1, 5, 6, 4, -1, -1},
241 { 2, 0, 1, 3, 4, 5, 6, -1, -1},
242 { 0, 5, 3, 4, 1, 2, 6, -1, -1},
243 { 3, 2, 4, 0, 1, 6, 7, 5, -1},
244 { 4, 5, 0, 1, 7, 2, 8, 3, 6},
245 { 3, 2, 4, 0, 1, 5, 8, 7, 6},
248 #define DCA_DOLBY 101 /* FIXME */
250 #define DCA_CHANNEL_BITS 6
251 #define DCA_CHANNEL_MASK 0x3F
255 #define HEADER_SIZE 14
257 #define DCA_MAX_FRAME_SIZE 16384
258 #define DCA_MAX_EXSS_HEADER_SIZE 4096
260 #define DCA_BUFFER_PADDING_SIZE 1024
262 /** Bit allocation */
264 int offset; ///< code values offset
265 int maxbits[8]; ///< max bits in VLC
266 int wrap; ///< wrap for get_vlc2()
267 VLC vlc[8]; ///< actual codes
270 static BitAlloc dca_bitalloc_index; ///< indexes for samples VLC select
271 static BitAlloc dca_tmode; ///< transition mode VLCs
272 static BitAlloc dca_scalefactor; ///< scalefactor VLCs
273 static BitAlloc dca_smpl_bitalloc[11]; ///< samples VLCs
275 static av_always_inline int get_bitalloc(GetBitContext *gb, BitAlloc *ba,
278 return get_vlc2(gb, ba->vlc[idx].table, ba->vlc[idx].bits, ba->wrap) +
283 AVCodecContext *avctx;
286 int frame_type; ///< type of the current frame
287 int samples_deficit; ///< deficit sample count
288 int crc_present; ///< crc is present in the bitstream
289 int sample_blocks; ///< number of PCM sample blocks
290 int frame_size; ///< primary frame byte size
291 int amode; ///< audio channels arrangement
292 int sample_rate; ///< audio sampling rate
293 int bit_rate; ///< transmission bit rate
294 int bit_rate_index; ///< transmission bit rate index
296 int downmix; ///< embedded downmix enabled
297 int dynrange; ///< embedded dynamic range flag
298 int timestamp; ///< embedded time stamp flag
299 int aux_data; ///< auxiliary data flag
300 int hdcd; ///< source material is mastered in HDCD
301 int ext_descr; ///< extension audio descriptor flag
302 int ext_coding; ///< extended coding flag
303 int aspf; ///< audio sync word insertion flag
304 int lfe; ///< low frequency effects flag
305 int predictor_history; ///< predictor history flag
306 int header_crc; ///< header crc check bytes
307 int multirate_inter; ///< multirate interpolator switch
308 int version; ///< encoder software revision
309 int copy_history; ///< copy history
310 int source_pcm_res; ///< source pcm resolution
311 int front_sum; ///< front sum/difference flag
312 int surround_sum; ///< surround sum/difference flag
313 int dialog_norm; ///< dialog normalisation parameter
315 /* Primary audio coding header */
316 int subframes; ///< number of subframes
317 int is_channels_set; ///< check for if the channel number is already set
318 int total_channels; ///< number of channels including extensions
319 int prim_channels; ///< number of primary audio channels
320 int subband_activity[DCA_PRIM_CHANNELS_MAX]; ///< subband activity count
321 int vq_start_subband[DCA_PRIM_CHANNELS_MAX]; ///< high frequency vq start subband
322 int joint_intensity[DCA_PRIM_CHANNELS_MAX]; ///< joint intensity coding index
323 int transient_huffman[DCA_PRIM_CHANNELS_MAX]; ///< transient mode code book
324 int scalefactor_huffman[DCA_PRIM_CHANNELS_MAX]; ///< scale factor code book
325 int bitalloc_huffman[DCA_PRIM_CHANNELS_MAX]; ///< bit allocation quantizer select
326 int quant_index_huffman[DCA_PRIM_CHANNELS_MAX][DCA_ABITS_MAX]; ///< quantization index codebook select
327 float scalefactor_adj[DCA_PRIM_CHANNELS_MAX][DCA_ABITS_MAX]; ///< scale factor adjustment
329 /* Primary audio coding side information */
330 int subsubframes[DCA_SUBFRAMES_MAX]; ///< number of subsubframes
331 int partial_samples[DCA_SUBFRAMES_MAX]; ///< partial subsubframe samples count
332 int prediction_mode[DCA_PRIM_CHANNELS_MAX][DCA_SUBBANDS]; ///< prediction mode (ADPCM used or not)
333 int prediction_vq[DCA_PRIM_CHANNELS_MAX][DCA_SUBBANDS]; ///< prediction VQ coefs
334 int bitalloc[DCA_PRIM_CHANNELS_MAX][DCA_SUBBANDS]; ///< bit allocation index
335 int transition_mode[DCA_PRIM_CHANNELS_MAX][DCA_SUBBANDS]; ///< transition mode (transients)
336 int scale_factor[DCA_PRIM_CHANNELS_MAX][DCA_SUBBANDS][2]; ///< scale factors (2 if transient)
337 int joint_huff[DCA_PRIM_CHANNELS_MAX]; ///< joint subband scale factors codebook
338 int joint_scale_factor[DCA_PRIM_CHANNELS_MAX][DCA_SUBBANDS]; ///< joint subband scale factors
339 int downmix_coef[DCA_PRIM_CHANNELS_MAX][2]; ///< stereo downmix coefficients
340 int dynrange_coef; ///< dynamic range coefficient
342 int high_freq_vq[DCA_PRIM_CHANNELS_MAX][DCA_SUBBANDS]; ///< VQ encoded high frequency subbands
344 float lfe_data[2 * DCA_LFE_MAX * (DCA_BLOCKS_MAX + 4)]; ///< Low frequency effect data
345 int lfe_scale_factor;
347 /* Subband samples history (for ADPCM) */
348 DECLARE_ALIGNED(16, float, subband_samples_hist)[DCA_PRIM_CHANNELS_MAX][DCA_SUBBANDS][4];
349 DECLARE_ALIGNED(32, float, subband_fir_hist)[DCA_PRIM_CHANNELS_MAX][512];
350 DECLARE_ALIGNED(32, float, subband_fir_noidea)[DCA_PRIM_CHANNELS_MAX][32];
351 int hist_index[DCA_PRIM_CHANNELS_MAX];
352 DECLARE_ALIGNED(32, float, raXin)[32];
354 int output; ///< type of output
355 float scale_bias; ///< output scale
357 DECLARE_ALIGNED(32, float, subband_samples)[DCA_BLOCKS_MAX][DCA_PRIM_CHANNELS_MAX][DCA_SUBBANDS][8];
358 DECLARE_ALIGNED(32, float, samples)[(DCA_PRIM_CHANNELS_MAX + 1) * 256];
359 const float *samples_chanptr[DCA_PRIM_CHANNELS_MAX + 1];
361 uint8_t dca_buffer[DCA_MAX_FRAME_SIZE + DCA_MAX_EXSS_HEADER_SIZE + DCA_BUFFER_PADDING_SIZE];
362 int dca_buffer_size; ///< how much data is in the dca_buffer
364 const int8_t *channel_order_tab; ///< channel reordering table, lfe and non lfe
366 /* Current position in DCA frame */
367 int current_subframe;
368 int current_subsubframe;
370 int core_ext_mask; ///< present extensions in the core substream
372 /* XCh extension information */
373 int xch_present; ///< XCh extension present and valid
374 int xch_base_channel; ///< index of first (only) channel containing XCH data
376 /* ExSS header parser */
377 int static_fields; ///< static fields present
378 int mix_metadata; ///< mixing metadata present
379 int num_mix_configs; ///< number of mix out configurations
380 int mix_config_num_ch[4]; ///< number of channels in each mix out configuration
384 int debug_flag; ///< used for suppressing repeated error messages output
387 SynthFilterContext synth;
388 DCADSPContext dcadsp;
389 FmtConvertContext fmt_conv;
392 static const uint16_t dca_vlc_offs[] = {
393 0, 512, 640, 768, 1282, 1794, 2436, 3080, 3770, 4454, 5364,
394 5372, 5380, 5388, 5392, 5396, 5412, 5420, 5428, 5460, 5492, 5508,
395 5572, 5604, 5668, 5796, 5860, 5892, 6412, 6668, 6796, 7308, 7564,
396 7820, 8076, 8620, 9132, 9388, 9910, 10166, 10680, 11196, 11726, 12240,
397 12752, 13298, 13810, 14326, 14840, 15500, 16022, 16540, 17158, 17678, 18264,
398 18796, 19352, 19926, 20468, 21472, 22398, 23014, 23622,
401 static av_cold void dca_init_vlcs(void)
403 static int vlcs_initialized = 0;
405 static VLC_TYPE dca_table[23622][2];
407 if (vlcs_initialized)
410 dca_bitalloc_index.offset = 1;
411 dca_bitalloc_index.wrap = 2;
412 for (i = 0; i < 5; i++) {
413 dca_bitalloc_index.vlc[i].table = &dca_table[dca_vlc_offs[i]];
414 dca_bitalloc_index.vlc[i].table_allocated = dca_vlc_offs[i + 1] - dca_vlc_offs[i];
415 init_vlc(&dca_bitalloc_index.vlc[i], bitalloc_12_vlc_bits[i], 12,
416 bitalloc_12_bits[i], 1, 1,
417 bitalloc_12_codes[i], 2, 2, INIT_VLC_USE_NEW_STATIC);
419 dca_scalefactor.offset = -64;
420 dca_scalefactor.wrap = 2;
421 for (i = 0; i < 5; i++) {
422 dca_scalefactor.vlc[i].table = &dca_table[dca_vlc_offs[i + 5]];
423 dca_scalefactor.vlc[i].table_allocated = dca_vlc_offs[i + 6] - dca_vlc_offs[i + 5];
424 init_vlc(&dca_scalefactor.vlc[i], SCALES_VLC_BITS, 129,
425 scales_bits[i], 1, 1,
426 scales_codes[i], 2, 2, INIT_VLC_USE_NEW_STATIC);
428 dca_tmode.offset = 0;
430 for (i = 0; i < 4; i++) {
431 dca_tmode.vlc[i].table = &dca_table[dca_vlc_offs[i + 10]];
432 dca_tmode.vlc[i].table_allocated = dca_vlc_offs[i + 11] - dca_vlc_offs[i + 10];
433 init_vlc(&dca_tmode.vlc[i], tmode_vlc_bits[i], 4,
435 tmode_codes[i], 2, 2, INIT_VLC_USE_NEW_STATIC);
438 for (i = 0; i < 10; i++)
439 for (j = 0; j < 7; j++) {
440 if (!bitalloc_codes[i][j])
442 dca_smpl_bitalloc[i + 1].offset = bitalloc_offsets[i];
443 dca_smpl_bitalloc[i + 1].wrap = 1 + (j > 4);
444 dca_smpl_bitalloc[i + 1].vlc[j].table = &dca_table[dca_vlc_offs[c]];
445 dca_smpl_bitalloc[i + 1].vlc[j].table_allocated = dca_vlc_offs[c + 1] - dca_vlc_offs[c];
447 init_vlc(&dca_smpl_bitalloc[i + 1].vlc[j], bitalloc_maxbits[i][j],
449 bitalloc_bits[i][j], 1, 1,
450 bitalloc_codes[i][j], 2, 2, INIT_VLC_USE_NEW_STATIC);
453 vlcs_initialized = 1;
456 static inline void get_array(GetBitContext *gb, int *dst, int len, int bits)
459 *dst++ = get_bits(gb, bits);
462 static int dca_parse_audio_coding_header(DCAContext *s, int base_channel)
465 static const float adj_table[4] = { 1.0, 1.1250, 1.2500, 1.4375 };
466 static const int bitlen[11] = { 0, 1, 2, 2, 2, 2, 3, 3, 3, 3, 3 };
467 static const int thr[11] = { 0, 1, 3, 3, 3, 3, 7, 7, 7, 7, 7 };
469 s->total_channels = get_bits(&s->gb, 3) + 1 + base_channel;
470 s->prim_channels = s->total_channels;
472 if (s->prim_channels > DCA_PRIM_CHANNELS_MAX)
473 s->prim_channels = DCA_PRIM_CHANNELS_MAX;
476 for (i = base_channel; i < s->prim_channels; i++) {
477 s->subband_activity[i] = get_bits(&s->gb, 5) + 2;
478 if (s->subband_activity[i] > DCA_SUBBANDS)
479 s->subband_activity[i] = DCA_SUBBANDS;
481 for (i = base_channel; i < s->prim_channels; i++) {
482 s->vq_start_subband[i] = get_bits(&s->gb, 5) + 1;
483 if (s->vq_start_subband[i] > DCA_SUBBANDS)
484 s->vq_start_subband[i] = DCA_SUBBANDS;
486 get_array(&s->gb, s->joint_intensity + base_channel, s->prim_channels - base_channel, 3);
487 get_array(&s->gb, s->transient_huffman + base_channel, s->prim_channels - base_channel, 2);
488 get_array(&s->gb, s->scalefactor_huffman + base_channel, s->prim_channels - base_channel, 3);
489 get_array(&s->gb, s->bitalloc_huffman + base_channel, s->prim_channels - base_channel, 3);
491 /* Get codebooks quantization indexes */
493 memset(s->quant_index_huffman, 0, sizeof(s->quant_index_huffman));
494 for (j = 1; j < 11; j++)
495 for (i = base_channel; i < s->prim_channels; i++)
496 s->quant_index_huffman[i][j] = get_bits(&s->gb, bitlen[j]);
498 /* Get scale factor adjustment */
499 for (j = 0; j < 11; j++)
500 for (i = base_channel; i < s->prim_channels; i++)
501 s->scalefactor_adj[i][j] = 1;
503 for (j = 1; j < 11; j++)
504 for (i = base_channel; i < s->prim_channels; i++)
505 if (s->quant_index_huffman[i][j] < thr[j])
506 s->scalefactor_adj[i][j] = adj_table[get_bits(&s->gb, 2)];
508 if (s->crc_present) {
509 /* Audio header CRC check */
510 get_bits(&s->gb, 16);
513 s->current_subframe = 0;
514 s->current_subsubframe = 0;
517 av_log(s->avctx, AV_LOG_DEBUG, "subframes: %i\n", s->subframes);
518 av_log(s->avctx, AV_LOG_DEBUG, "prim channels: %i\n", s->prim_channels);
519 for (i = base_channel; i < s->prim_channels; i++) {
520 av_log(s->avctx, AV_LOG_DEBUG, "subband activity: %i\n",
521 s->subband_activity[i]);
522 av_log(s->avctx, AV_LOG_DEBUG, "vq start subband: %i\n",
523 s->vq_start_subband[i]);
524 av_log(s->avctx, AV_LOG_DEBUG, "joint intensity: %i\n",
525 s->joint_intensity[i]);
526 av_log(s->avctx, AV_LOG_DEBUG, "transient mode codebook: %i\n",
527 s->transient_huffman[i]);
528 av_log(s->avctx, AV_LOG_DEBUG, "scale factor codebook: %i\n",
529 s->scalefactor_huffman[i]);
530 av_log(s->avctx, AV_LOG_DEBUG, "bit allocation quantizer: %i\n",
531 s->bitalloc_huffman[i]);
532 av_log(s->avctx, AV_LOG_DEBUG, "quant index huff:");
533 for (j = 0; j < 11; j++)
534 av_log(s->avctx, AV_LOG_DEBUG, " %i", s->quant_index_huffman[i][j]);
535 av_log(s->avctx, AV_LOG_DEBUG, "\n");
536 av_log(s->avctx, AV_LOG_DEBUG, "scalefac adj:");
537 for (j = 0; j < 11; j++)
538 av_log(s->avctx, AV_LOG_DEBUG, " %1.3f", s->scalefactor_adj[i][j]);
539 av_log(s->avctx, AV_LOG_DEBUG, "\n");
546 static int dca_parse_frame_header(DCAContext *s)
548 init_get_bits(&s->gb, s->dca_buffer, s->dca_buffer_size * 8);
551 skip_bits_long(&s->gb, 32);
554 s->frame_type = get_bits(&s->gb, 1);
555 s->samples_deficit = get_bits(&s->gb, 5) + 1;
556 s->crc_present = get_bits(&s->gb, 1);
557 s->sample_blocks = get_bits(&s->gb, 7) + 1;
558 s->frame_size = get_bits(&s->gb, 14) + 1;
559 if (s->frame_size < 95)
560 return AVERROR_INVALIDDATA;
561 s->amode = get_bits(&s->gb, 6);
562 s->sample_rate = dca_sample_rates[get_bits(&s->gb, 4)];
564 return AVERROR_INVALIDDATA;
565 s->bit_rate_index = get_bits(&s->gb, 5);
566 s->bit_rate = dca_bit_rates[s->bit_rate_index];
568 return AVERROR_INVALIDDATA;
570 s->downmix = get_bits(&s->gb, 1);
571 s->dynrange = get_bits(&s->gb, 1);
572 s->timestamp = get_bits(&s->gb, 1);
573 s->aux_data = get_bits(&s->gb, 1);
574 s->hdcd = get_bits(&s->gb, 1);
575 s->ext_descr = get_bits(&s->gb, 3);
576 s->ext_coding = get_bits(&s->gb, 1);
577 s->aspf = get_bits(&s->gb, 1);
578 s->lfe = get_bits(&s->gb, 2);
579 s->predictor_history = get_bits(&s->gb, 1);
581 /* TODO: check CRC */
583 s->header_crc = get_bits(&s->gb, 16);
585 s->multirate_inter = get_bits(&s->gb, 1);
586 s->version = get_bits(&s->gb, 4);
587 s->copy_history = get_bits(&s->gb, 2);
588 s->source_pcm_res = get_bits(&s->gb, 3);
589 s->front_sum = get_bits(&s->gb, 1);
590 s->surround_sum = get_bits(&s->gb, 1);
591 s->dialog_norm = get_bits(&s->gb, 4);
593 /* FIXME: channels mixing levels */
594 s->output = s->amode;
596 s->output |= DCA_LFE;
599 av_log(s->avctx, AV_LOG_DEBUG, "frame type: %i\n", s->frame_type);
600 av_log(s->avctx, AV_LOG_DEBUG, "samples deficit: %i\n", s->samples_deficit);
601 av_log(s->avctx, AV_LOG_DEBUG, "crc present: %i\n", s->crc_present);
602 av_log(s->avctx, AV_LOG_DEBUG, "sample blocks: %i (%i samples)\n",
603 s->sample_blocks, s->sample_blocks * 32);
604 av_log(s->avctx, AV_LOG_DEBUG, "frame size: %i bytes\n", s->frame_size);
605 av_log(s->avctx, AV_LOG_DEBUG, "amode: %i (%i channels)\n",
606 s->amode, dca_channels[s->amode]);
607 av_log(s->avctx, AV_LOG_DEBUG, "sample rate: %i Hz\n",
609 av_log(s->avctx, AV_LOG_DEBUG, "bit rate: %i bits/s\n",
611 av_log(s->avctx, AV_LOG_DEBUG, "downmix: %i\n", s->downmix);
612 av_log(s->avctx, AV_LOG_DEBUG, "dynrange: %i\n", s->dynrange);
613 av_log(s->avctx, AV_LOG_DEBUG, "timestamp: %i\n", s->timestamp);
614 av_log(s->avctx, AV_LOG_DEBUG, "aux_data: %i\n", s->aux_data);
615 av_log(s->avctx, AV_LOG_DEBUG, "hdcd: %i\n", s->hdcd);
616 av_log(s->avctx, AV_LOG_DEBUG, "ext descr: %i\n", s->ext_descr);
617 av_log(s->avctx, AV_LOG_DEBUG, "ext coding: %i\n", s->ext_coding);
618 av_log(s->avctx, AV_LOG_DEBUG, "aspf: %i\n", s->aspf);
619 av_log(s->avctx, AV_LOG_DEBUG, "lfe: %i\n", s->lfe);
620 av_log(s->avctx, AV_LOG_DEBUG, "predictor history: %i\n",
621 s->predictor_history);
622 av_log(s->avctx, AV_LOG_DEBUG, "header crc: %i\n", s->header_crc);
623 av_log(s->avctx, AV_LOG_DEBUG, "multirate inter: %i\n",
625 av_log(s->avctx, AV_LOG_DEBUG, "version number: %i\n", s->version);
626 av_log(s->avctx, AV_LOG_DEBUG, "copy history: %i\n", s->copy_history);
627 av_log(s->avctx, AV_LOG_DEBUG,
628 "source pcm resolution: %i (%i bits/sample)\n",
629 s->source_pcm_res, dca_bits_per_sample[s->source_pcm_res]);
630 av_log(s->avctx, AV_LOG_DEBUG, "front sum: %i\n", s->front_sum);
631 av_log(s->avctx, AV_LOG_DEBUG, "surround sum: %i\n", s->surround_sum);
632 av_log(s->avctx, AV_LOG_DEBUG, "dialog norm: %i\n", s->dialog_norm);
633 av_log(s->avctx, AV_LOG_DEBUG, "\n");
636 /* Primary audio coding header */
637 s->subframes = get_bits(&s->gb, 4) + 1;
639 return dca_parse_audio_coding_header(s, 0);
643 static inline int get_scale(GetBitContext *gb, int level, int value, int log2range)
646 /* huffman encoded */
647 value += get_bitalloc(gb, &dca_scalefactor, level);
648 value = av_clip_uintp2(value, log2range);
649 } else if (level < 8) {
650 if (level + 1 > log2range) {
651 skip_bits(gb, level + 1 - log2range);
652 value = get_bits(gb, log2range);
654 value = get_bits(gb, level + 1);
660 static int dca_subframe_header(DCAContext *s, int base_channel, int block_index)
662 /* Primary audio coding side information */
665 if (get_bits_left(&s->gb) < 0)
666 return AVERROR_INVALIDDATA;
669 s->subsubframes[s->current_subframe] = get_bits(&s->gb, 2) + 1;
670 s->partial_samples[s->current_subframe] = get_bits(&s->gb, 3);
673 for (j = base_channel; j < s->prim_channels; j++) {
674 for (k = 0; k < s->subband_activity[j]; k++)
675 s->prediction_mode[j][k] = get_bits(&s->gb, 1);
678 /* Get prediction codebook */
679 for (j = base_channel; j < s->prim_channels; j++) {
680 for (k = 0; k < s->subband_activity[j]; k++) {
681 if (s->prediction_mode[j][k] > 0) {
682 /* (Prediction coefficient VQ address) */
683 s->prediction_vq[j][k] = get_bits(&s->gb, 12);
688 /* Bit allocation index */
689 for (j = base_channel; j < s->prim_channels; j++) {
690 for (k = 0; k < s->vq_start_subband[j]; k++) {
691 if (s->bitalloc_huffman[j] == 6)
692 s->bitalloc[j][k] = get_bits(&s->gb, 5);
693 else if (s->bitalloc_huffman[j] == 5)
694 s->bitalloc[j][k] = get_bits(&s->gb, 4);
695 else if (s->bitalloc_huffman[j] == 7) {
696 av_log(s->avctx, AV_LOG_ERROR,
697 "Invalid bit allocation index\n");
698 return AVERROR_INVALIDDATA;
701 get_bitalloc(&s->gb, &dca_bitalloc_index, s->bitalloc_huffman[j]);
704 if (s->bitalloc[j][k] > 26) {
705 // av_log(s->avctx, AV_LOG_DEBUG, "bitalloc index [%i][%i] too big (%i)\n",
706 // j, k, s->bitalloc[j][k]);
707 return AVERROR_INVALIDDATA;
712 /* Transition mode */
713 for (j = base_channel; j < s->prim_channels; j++) {
714 for (k = 0; k < s->subband_activity[j]; k++) {
715 s->transition_mode[j][k] = 0;
716 if (s->subsubframes[s->current_subframe] > 1 &&
717 k < s->vq_start_subband[j] && s->bitalloc[j][k] > 0) {
718 s->transition_mode[j][k] =
719 get_bitalloc(&s->gb, &dca_tmode, s->transient_huffman[j]);
724 if (get_bits_left(&s->gb) < 0)
725 return AVERROR_INVALIDDATA;
727 for (j = base_channel; j < s->prim_channels; j++) {
728 const uint32_t *scale_table;
729 int scale_sum, log_size;
731 memset(s->scale_factor[j], 0,
732 s->subband_activity[j] * sizeof(s->scale_factor[0][0][0]) * 2);
734 if (s->scalefactor_huffman[j] == 6) {
735 scale_table = scale_factor_quant7;
738 scale_table = scale_factor_quant6;
742 /* When huffman coded, only the difference is encoded */
745 for (k = 0; k < s->subband_activity[j]; k++) {
746 if (k >= s->vq_start_subband[j] || s->bitalloc[j][k] > 0) {
747 scale_sum = get_scale(&s->gb, s->scalefactor_huffman[j], scale_sum, log_size);
748 s->scale_factor[j][k][0] = scale_table[scale_sum];
751 if (k < s->vq_start_subband[j] && s->transition_mode[j][k]) {
752 /* Get second scale factor */
753 scale_sum = get_scale(&s->gb, s->scalefactor_huffman[j], scale_sum, log_size);
754 s->scale_factor[j][k][1] = scale_table[scale_sum];
759 /* Joint subband scale factor codebook select */
760 for (j = base_channel; j < s->prim_channels; j++) {
761 /* Transmitted only if joint subband coding enabled */
762 if (s->joint_intensity[j] > 0)
763 s->joint_huff[j] = get_bits(&s->gb, 3);
766 if (get_bits_left(&s->gb) < 0)
767 return AVERROR_INVALIDDATA;
769 /* Scale factors for joint subband coding */
770 for (j = base_channel; j < s->prim_channels; j++) {
773 /* Transmitted only if joint subband coding enabled */
774 if (s->joint_intensity[j] > 0) {
776 source_channel = s->joint_intensity[j] - 1;
778 /* When huffman coded, only the difference is encoded
779 * (is this valid as well for joint scales ???) */
781 for (k = s->subband_activity[j]; k < s->subband_activity[source_channel]; k++) {
782 scale = get_scale(&s->gb, s->joint_huff[j], 64 /* bias */, 7);
783 s->joint_scale_factor[j][k] = scale; /*joint_scale_table[scale]; */
786 if (!(s->debug_flag & 0x02)) {
787 av_log(s->avctx, AV_LOG_DEBUG,
788 "Joint stereo coding not supported\n");
789 s->debug_flag |= 0x02;
794 /* Stereo downmix coefficients */
795 if (!base_channel && s->prim_channels > 2) {
797 for (j = base_channel; j < s->prim_channels; j++) {
798 s->downmix_coef[j][0] = get_bits(&s->gb, 7);
799 s->downmix_coef[j][1] = get_bits(&s->gb, 7);
802 int am = s->amode & DCA_CHANNEL_MASK;
803 if (am >= FF_ARRAY_ELEMS(dca_default_coeffs)) {
804 av_log(s->avctx, AV_LOG_ERROR,
805 "Invalid channel mode %d\n", am);
806 return AVERROR_INVALIDDATA;
808 for (j = base_channel; j < s->prim_channels; j++) {
809 s->downmix_coef[j][0] = dca_default_coeffs[am][j][0];
810 s->downmix_coef[j][1] = dca_default_coeffs[am][j][1];
815 /* Dynamic range coefficient */
816 if (!base_channel && s->dynrange)
817 s->dynrange_coef = get_bits(&s->gb, 8);
819 /* Side information CRC check word */
820 if (s->crc_present) {
821 get_bits(&s->gb, 16);
825 * Primary audio data arrays
828 /* VQ encoded high frequency subbands */
829 for (j = base_channel; j < s->prim_channels; j++)
830 for (k = s->vq_start_subband[j]; k < s->subband_activity[j]; k++)
831 /* 1 vector -> 32 samples */
832 s->high_freq_vq[j][k] = get_bits(&s->gb, 10);
834 /* Low frequency effect data */
835 if (!base_channel && s->lfe) {
837 int lfe_samples = 2 * s->lfe * (4 + block_index);
838 int lfe_end_sample = 2 * s->lfe * (4 + block_index + s->subsubframes[s->current_subframe]);
841 for (j = lfe_samples; j < lfe_end_sample; j++) {
842 /* Signed 8 bits int */
843 s->lfe_data[j] = get_sbits(&s->gb, 8);
846 /* Scale factor index */
847 skip_bits(&s->gb, 1);
848 s->lfe_scale_factor = scale_factor_quant7[get_bits(&s->gb, 7)];
850 /* Quantization step size * scale factor */
851 lfe_scale = 0.035 * s->lfe_scale_factor;
853 for (j = lfe_samples; j < lfe_end_sample; j++)
854 s->lfe_data[j] *= lfe_scale;
858 av_log(s->avctx, AV_LOG_DEBUG, "subsubframes: %i\n",
859 s->subsubframes[s->current_subframe]);
860 av_log(s->avctx, AV_LOG_DEBUG, "partial samples: %i\n",
861 s->partial_samples[s->current_subframe]);
863 for (j = base_channel; j < s->prim_channels; j++) {
864 av_log(s->avctx, AV_LOG_DEBUG, "prediction mode:");
865 for (k = 0; k < s->subband_activity[j]; k++)
866 av_log(s->avctx, AV_LOG_DEBUG, " %i", s->prediction_mode[j][k]);
867 av_log(s->avctx, AV_LOG_DEBUG, "\n");
869 for (j = base_channel; j < s->prim_channels; j++) {
870 for (k = 0; k < s->subband_activity[j]; k++)
871 av_log(s->avctx, AV_LOG_DEBUG,
872 "prediction coefs: %f, %f, %f, %f\n",
873 (float) adpcm_vb[s->prediction_vq[j][k]][0] / 8192,
874 (float) adpcm_vb[s->prediction_vq[j][k]][1] / 8192,
875 (float) adpcm_vb[s->prediction_vq[j][k]][2] / 8192,
876 (float) adpcm_vb[s->prediction_vq[j][k]][3] / 8192);
878 for (j = base_channel; j < s->prim_channels; j++) {
879 av_log(s->avctx, AV_LOG_DEBUG, "bitalloc index: ");
880 for (k = 0; k < s->vq_start_subband[j]; k++)
881 av_log(s->avctx, AV_LOG_DEBUG, "%2.2i ", s->bitalloc[j][k]);
882 av_log(s->avctx, AV_LOG_DEBUG, "\n");
884 for (j = base_channel; j < s->prim_channels; j++) {
885 av_log(s->avctx, AV_LOG_DEBUG, "Transition mode:");
886 for (k = 0; k < s->subband_activity[j]; k++)
887 av_log(s->avctx, AV_LOG_DEBUG, " %i", s->transition_mode[j][k]);
888 av_log(s->avctx, AV_LOG_DEBUG, "\n");
890 for (j = base_channel; j < s->prim_channels; j++) {
891 av_log(s->avctx, AV_LOG_DEBUG, "Scale factor:");
892 for (k = 0; k < s->subband_activity[j]; k++) {
893 if (k >= s->vq_start_subband[j] || s->bitalloc[j][k] > 0)
894 av_log(s->avctx, AV_LOG_DEBUG, " %i", s->scale_factor[j][k][0]);
895 if (k < s->vq_start_subband[j] && s->transition_mode[j][k])
896 av_log(s->avctx, AV_LOG_DEBUG, " %i(t)", s->scale_factor[j][k][1]);
898 av_log(s->avctx, AV_LOG_DEBUG, "\n");
900 for (j = base_channel; j < s->prim_channels; j++) {
901 if (s->joint_intensity[j] > 0) {
902 int source_channel = s->joint_intensity[j] - 1;
903 av_log(s->avctx, AV_LOG_DEBUG, "Joint scale factor index:\n");
904 for (k = s->subband_activity[j]; k < s->subband_activity[source_channel]; k++)
905 av_log(s->avctx, AV_LOG_DEBUG, " %i", s->joint_scale_factor[j][k]);
906 av_log(s->avctx, AV_LOG_DEBUG, "\n");
909 if (!base_channel && s->prim_channels > 2 && s->downmix) {
910 av_log(s->avctx, AV_LOG_DEBUG, "Downmix coeffs:\n");
911 for (j = 0; j < s->prim_channels; j++) {
912 av_log(s->avctx, AV_LOG_DEBUG, "Channel 0, %d = %f\n", j,
913 dca_downmix_coeffs[s->downmix_coef[j][0]]);
914 av_log(s->avctx, AV_LOG_DEBUG, "Channel 1, %d = %f\n", j,
915 dca_downmix_coeffs[s->downmix_coef[j][1]]);
917 av_log(s->avctx, AV_LOG_DEBUG, "\n");
919 for (j = base_channel; j < s->prim_channels; j++)
920 for (k = s->vq_start_subband[j]; k < s->subband_activity[j]; k++)
921 av_log(s->avctx, AV_LOG_DEBUG, "VQ index: %i\n", s->high_freq_vq[j][k]);
922 if (!base_channel && s->lfe) {
923 int lfe_samples = 2 * s->lfe * (4 + block_index);
924 int lfe_end_sample = 2 * s->lfe * (4 + block_index + s->subsubframes[s->current_subframe]);
926 av_log(s->avctx, AV_LOG_DEBUG, "LFE samples:\n");
927 for (j = lfe_samples; j < lfe_end_sample; j++)
928 av_log(s->avctx, AV_LOG_DEBUG, " %f", s->lfe_data[j]);
929 av_log(s->avctx, AV_LOG_DEBUG, "\n");
936 static void qmf_32_subbands(DCAContext *s, int chans,
937 float samples_in[32][8], float *samples_out,
940 const float *prCoeff;
943 int sb_act = s->subband_activity[chans];
946 scale *= sqrt(1 / 8.0);
949 if (!s->multirate_inter) /* Non-perfect reconstruction */
950 prCoeff = fir_32bands_nonperfect;
951 else /* Perfect reconstruction */
952 prCoeff = fir_32bands_perfect;
954 for (i = sb_act; i < 32; i++)
957 /* Reconstructed channel sample index */
958 for (subindex = 0; subindex < 8; subindex++) {
959 /* Load in one sample from each subband and clear inactive subbands */
960 for (i = 0; i < sb_act; i++) {
961 unsigned sign = (i - 1) & 2;
962 uint32_t v = AV_RN32A(&samples_in[i][subindex]) ^ sign << 30;
963 AV_WN32A(&s->raXin[i], v);
966 s->synth.synth_filter_float(&s->imdct,
967 s->subband_fir_hist[chans],
968 &s->hist_index[chans],
969 s->subband_fir_noidea[chans], prCoeff,
970 samples_out, s->raXin, scale);
975 static void lfe_interpolation_fir(DCAContext *s, int decimation_select,
976 int num_deci_sample, float *samples_in,
977 float *samples_out, float scale)
979 /* samples_in: An array holding decimated samples.
980 * Samples in current subframe starts from samples_in[0],
981 * while samples_in[-1], samples_in[-2], ..., stores samples
982 * from last subframe as history.
984 * samples_out: An array holding interpolated samples
988 const float *prCoeff;
991 /* Select decimation filter */
992 if (decimation_select == 1) {
994 prCoeff = lfe_fir_128;
997 prCoeff = lfe_fir_64;
1000 for (deciindex = 0; deciindex < num_deci_sample; deciindex++) {
1001 s->dcadsp.lfe_fir(samples_out, samples_in, prCoeff, decifactor, scale);
1003 samples_out += 2 * decifactor;
1007 /* downmixing routines */
1008 #define MIX_REAR1(samples, si1, rs, coef) \
1009 samples[i] += samples[si1] * coef[rs][0]; \
1010 samples[i+256] += samples[si1] * coef[rs][1];
1012 #define MIX_REAR2(samples, si1, si2, rs, coef) \
1013 samples[i] += samples[si1] * coef[rs][0] + samples[si2] * coef[rs + 1][0]; \
1014 samples[i+256] += samples[si1] * coef[rs][1] + samples[si2] * coef[rs + 1][1];
1016 #define MIX_FRONT3(samples, coef) \
1017 t = samples[i + c]; \
1018 u = samples[i + l]; \
1019 v = samples[i + r]; \
1020 samples[i] = t * coef[0][0] + u * coef[1][0] + v * coef[2][0]; \
1021 samples[i+256] = t * coef[0][1] + u * coef[1][1] + v * coef[2][1];
1023 #define DOWNMIX_TO_STEREO(op1, op2) \
1024 for (i = 0; i < 256; i++) { \
1029 static void dca_downmix(float *samples, int srcfmt,
1030 int downmix_coef[DCA_PRIM_CHANNELS_MAX][2],
1031 const int8_t *channel_mapping)
1033 int c, l, r, sl, sr, s;
1036 float coef[DCA_PRIM_CHANNELS_MAX][2];
1038 for (i = 0; i < DCA_PRIM_CHANNELS_MAX; i++) {
1039 coef[i][0] = dca_downmix_coeffs[downmix_coef[i][0]];
1040 coef[i][1] = dca_downmix_coeffs[downmix_coef[i][1]];
1046 case DCA_STEREO_TOTAL:
1047 case DCA_STEREO_SUMDIFF:
1049 av_log(NULL, 0, "Not implemented!\n");
1054 c = channel_mapping[0] * 256;
1055 l = channel_mapping[1] * 256;
1056 r = channel_mapping[2] * 256;
1057 DOWNMIX_TO_STEREO(MIX_FRONT3(samples, coef), );
1060 s = channel_mapping[2] * 256;
1061 DOWNMIX_TO_STEREO(MIX_REAR1(samples, i + s, 2, coef), );
1064 c = channel_mapping[0] * 256;
1065 l = channel_mapping[1] * 256;
1066 r = channel_mapping[2] * 256;
1067 s = channel_mapping[3] * 256;
1068 DOWNMIX_TO_STEREO(MIX_FRONT3(samples, coef),
1069 MIX_REAR1(samples, i + s, 3, coef));
1072 sl = channel_mapping[2] * 256;
1073 sr = channel_mapping[3] * 256;
1074 DOWNMIX_TO_STEREO(MIX_REAR2(samples, i + sl, i + sr, 2, coef), );
1077 c = channel_mapping[0] * 256;
1078 l = channel_mapping[1] * 256;
1079 r = channel_mapping[2] * 256;
1080 sl = channel_mapping[3] * 256;
1081 sr = channel_mapping[4] * 256;
1082 DOWNMIX_TO_STEREO(MIX_FRONT3(samples, coef),
1083 MIX_REAR2(samples, i + sl, i + sr, 3, coef));
1089 #ifndef decode_blockcodes
1090 /* Very compact version of the block code decoder that does not use table
1091 * look-up but is slightly slower */
1092 static int decode_blockcode(int code, int levels, int *values)
1095 int offset = (levels - 1) >> 1;
1097 for (i = 0; i < 4; i++) {
1098 int div = FASTDIV(code, levels);
1099 values[i] = code - offset - div * levels;
1106 static int decode_blockcodes(int code1, int code2, int levels, int *values)
1108 return decode_blockcode(code1, levels, values) |
1109 decode_blockcode(code2, levels, values + 4);
1113 static const uint8_t abits_sizes[7] = { 7, 10, 12, 13, 15, 17, 19 };
1114 static const uint8_t abits_levels[7] = { 3, 5, 7, 9, 13, 17, 25 };
1116 #ifndef int8x8_fmul_int32
1117 static inline void int8x8_fmul_int32(float *dst, const int8_t *src, int scale)
1119 float fscale = scale / 16.0;
1121 for (i = 0; i < 8; i++)
1122 dst[i] = src[i] * fscale;
1126 static int dca_subsubframe(DCAContext *s, int base_channel, int block_index)
1129 int subsubframe = s->current_subsubframe;
1131 const float *quant_step_table;
1134 float (*subband_samples)[DCA_SUBBANDS][8] = s->subband_samples[block_index];
1135 LOCAL_ALIGNED_16(int, block, [8]);
1141 /* Select quantization step size table */
1142 if (s->bit_rate_index == 0x1f)
1143 quant_step_table = lossless_quant_d;
1145 quant_step_table = lossy_quant_d;
1147 for (k = base_channel; k < s->prim_channels; k++) {
1148 if (get_bits_left(&s->gb) < 0)
1149 return AVERROR_INVALIDDATA;
1151 for (l = 0; l < s->vq_start_subband[k]; l++) {
1154 /* Select the mid-tread linear quantizer */
1155 int abits = s->bitalloc[k][l];
1157 float quant_step_size = quant_step_table[abits];
1160 * Determine quantization index code book and its type
1163 /* Select quantization index code book */
1164 int sel = s->quant_index_huffman[k][abits];
1167 * Extract bits from the bit stream
1170 memset(subband_samples[k][l], 0, 8 * sizeof(subband_samples[0][0][0]));
1172 /* Deal with transients */
1173 int sfi = s->transition_mode[k][l] && subsubframe >= s->transition_mode[k][l];
1174 float rscale = quant_step_size * s->scale_factor[k][l][sfi] *
1175 s->scalefactor_adj[k][sel];
1177 if (abits >= 11 || !dca_smpl_bitalloc[abits].vlc[sel].table) {
1180 int block_code1, block_code2, size, levels, err;
1182 size = abits_sizes[abits - 1];
1183 levels = abits_levels[abits - 1];
1185 block_code1 = get_bits(&s->gb, size);
1186 block_code2 = get_bits(&s->gb, size);
1187 err = decode_blockcodes(block_code1, block_code2,
1190 av_log(s->avctx, AV_LOG_ERROR,
1191 "ERROR: block code look-up failed\n");
1192 return AVERROR_INVALIDDATA;
1196 for (m = 0; m < 8; m++)
1197 block[m] = get_sbits(&s->gb, abits - 3);
1201 for (m = 0; m < 8; m++)
1202 block[m] = get_bitalloc(&s->gb,
1203 &dca_smpl_bitalloc[abits], sel);
1206 s->fmt_conv.int32_to_float_fmul_scalar(subband_samples[k][l],
1211 * Inverse ADPCM if in prediction mode
1213 if (s->prediction_mode[k][l]) {
1215 for (m = 0; m < 8; m++) {
1216 for (n = 1; n <= 4; n++)
1218 subband_samples[k][l][m] +=
1219 (adpcm_vb[s->prediction_vq[k][l]][n - 1] *
1220 subband_samples[k][l][m - n] / 8192);
1221 else if (s->predictor_history)
1222 subband_samples[k][l][m] +=
1223 (adpcm_vb[s->prediction_vq[k][l]][n - 1] *
1224 s->subband_samples_hist[k][l][m - n + 4] / 8192);
1230 * Decode VQ encoded high frequencies
1232 for (l = s->vq_start_subband[k]; l < s->subband_activity[k]; l++) {
1233 /* 1 vector -> 32 samples but we only need the 8 samples
1234 * for this subsubframe. */
1235 int hfvq = s->high_freq_vq[k][l];
1237 if (!s->debug_flag & 0x01) {
1238 av_log(s->avctx, AV_LOG_DEBUG,
1239 "Stream with high frequencies VQ coding\n");
1240 s->debug_flag |= 0x01;
1243 int8x8_fmul_int32(subband_samples[k][l],
1244 &high_freq_vq[hfvq][subsubframe * 8],
1245 s->scale_factor[k][l][0]);
1249 /* Check for DSYNC after subsubframe */
1250 if (s->aspf || subsubframe == s->subsubframes[s->current_subframe] - 1) {
1251 if (0xFFFF == get_bits(&s->gb, 16)) { /* 0xFFFF */
1253 av_log(s->avctx, AV_LOG_DEBUG, "Got subframe DSYNC\n");
1256 av_log(s->avctx, AV_LOG_ERROR, "Didn't get subframe DSYNC\n");
1260 /* Backup predictor history for adpcm */
1261 for (k = base_channel; k < s->prim_channels; k++)
1262 for (l = 0; l < s->vq_start_subband[k]; l++)
1263 memcpy(s->subband_samples_hist[k][l],
1264 &subband_samples[k][l][4],
1265 4 * sizeof(subband_samples[0][0][0]));
1270 static int dca_filter_channels(DCAContext *s, int block_index)
1272 float (*subband_samples)[DCA_SUBBANDS][8] = s->subband_samples[block_index];
1275 /* 32 subbands QMF */
1276 for (k = 0; k < s->prim_channels; k++) {
1277 /* static float pcm_to_double[8] = { 32768.0, 32768.0, 524288.0, 524288.0,
1278 0, 8388608.0, 8388608.0 };*/
1279 qmf_32_subbands(s, k, subband_samples[k],
1280 &s->samples[256 * s->channel_order_tab[k]],
1281 M_SQRT1_2 * s->scale_bias /* pcm_to_double[s->source_pcm_res] */);
1285 if (s->avctx->request_channels == 2 && s->prim_channels > 2) {
1286 dca_downmix(s->samples, s->amode, s->downmix_coef, s->channel_order_tab);
1289 /* Generate LFE samples for this subsubframe FIXME!!! */
1290 if (s->output & DCA_LFE) {
1291 lfe_interpolation_fir(s, s->lfe, 2 * s->lfe,
1292 s->lfe_data + 2 * s->lfe * (block_index + 4),
1293 &s->samples[256 * dca_lfe_index[s->amode]],
1294 (1.0 / 256.0) * s->scale_bias);
1295 /* Outputs 20bits pcm samples */
1302 static int dca_subframe_footer(DCAContext *s, int base_channel)
1304 int aux_data_count = 0, i;
1307 * Unpack optional information
1310 /* presumably optional information only appears in the core? */
1311 if (!base_channel) {
1313 skip_bits_long(&s->gb, 32);
1316 aux_data_count = get_bits(&s->gb, 6);
1318 for (i = 0; i < aux_data_count; i++)
1319 get_bits(&s->gb, 8);
1321 if (s->crc_present && (s->downmix || s->dynrange))
1322 get_bits(&s->gb, 16);
1329 * Decode a dca frame block
1331 * @param s pointer to the DCAContext
1334 static int dca_decode_block(DCAContext *s, int base_channel, int block_index)
1339 if (s->current_subframe >= s->subframes) {
1340 av_log(s->avctx, AV_LOG_DEBUG, "check failed: %i>%i",
1341 s->current_subframe, s->subframes);
1342 return AVERROR_INVALIDDATA;
1345 if (!s->current_subsubframe) {
1347 av_log(s->avctx, AV_LOG_DEBUG, "DSYNC dca_subframe_header\n");
1349 /* Read subframe header */
1350 if ((ret = dca_subframe_header(s, base_channel, block_index)))
1354 /* Read subsubframe */
1356 av_log(s->avctx, AV_LOG_DEBUG, "DSYNC dca_subsubframe\n");
1358 if ((ret = dca_subsubframe(s, base_channel, block_index)))
1362 s->current_subsubframe++;
1363 if (s->current_subsubframe >= s->subsubframes[s->current_subframe]) {
1364 s->current_subsubframe = 0;
1365 s->current_subframe++;
1367 if (s->current_subframe >= s->subframes) {
1369 av_log(s->avctx, AV_LOG_DEBUG, "DSYNC dca_subframe_footer\n");
1371 /* Read subframe footer */
1372 if ((ret = dca_subframe_footer(s, base_channel)))
1380 * Return the number of channels in an ExSS speaker mask (HD)
1382 static int dca_exss_mask2count(int mask)
1384 /* count bits that mean speaker pairs twice */
1385 return av_popcount(mask) +
1386 av_popcount(mask & (DCA_EXSS_CENTER_LEFT_RIGHT |
1387 DCA_EXSS_FRONT_LEFT_RIGHT |
1388 DCA_EXSS_FRONT_HIGH_LEFT_RIGHT |
1389 DCA_EXSS_WIDE_LEFT_RIGHT |
1390 DCA_EXSS_SIDE_LEFT_RIGHT |
1391 DCA_EXSS_SIDE_HIGH_LEFT_RIGHT |
1392 DCA_EXSS_SIDE_REAR_LEFT_RIGHT |
1393 DCA_EXSS_REAR_LEFT_RIGHT |
1394 DCA_EXSS_REAR_HIGH_LEFT_RIGHT));
1398 * Skip mixing coefficients of a single mix out configuration (HD)
1400 static void dca_exss_skip_mix_coeffs(GetBitContext *gb, int channels, int out_ch)
1404 for (i = 0; i < channels; i++) {
1405 int mix_map_mask = get_bits(gb, out_ch);
1406 int num_coeffs = av_popcount(mix_map_mask);
1407 skip_bits_long(gb, num_coeffs * 6);
1412 * Parse extension substream asset header (HD)
1414 static int dca_exss_parse_asset_header(DCAContext *s)
1416 int header_pos = get_bits_count(&s->gb);
1419 int embedded_stereo = 0;
1420 int embedded_6ch = 0;
1421 int drc_code_present;
1422 int extensions_mask;
1425 if (get_bits_left(&s->gb) < 16)
1428 /* We will parse just enough to get to the extensions bitmask with which
1429 * we can set the profile value. */
1431 header_size = get_bits(&s->gb, 9) + 1;
1432 skip_bits(&s->gb, 3); // asset index
1434 if (s->static_fields) {
1435 if (get_bits1(&s->gb))
1436 skip_bits(&s->gb, 4); // asset type descriptor
1437 if (get_bits1(&s->gb))
1438 skip_bits_long(&s->gb, 24); // language descriptor
1440 if (get_bits1(&s->gb)) {
1441 /* How can one fit 1024 bytes of text here if the maximum value
1442 * for the asset header size field above was 512 bytes? */
1443 int text_length = get_bits(&s->gb, 10) + 1;
1444 if (get_bits_left(&s->gb) < text_length * 8)
1446 skip_bits_long(&s->gb, text_length * 8); // info text
1449 skip_bits(&s->gb, 5); // bit resolution - 1
1450 skip_bits(&s->gb, 4); // max sample rate code
1451 channels = get_bits(&s->gb, 8) + 1;
1453 if (get_bits1(&s->gb)) { // 1-to-1 channels to speakers
1454 int spkr_remap_sets;
1455 int spkr_mask_size = 16;
1459 embedded_stereo = get_bits1(&s->gb);
1461 embedded_6ch = get_bits1(&s->gb);
1463 if (get_bits1(&s->gb)) {
1464 spkr_mask_size = (get_bits(&s->gb, 2) + 1) << 2;
1465 skip_bits(&s->gb, spkr_mask_size); // spkr activity mask
1468 spkr_remap_sets = get_bits(&s->gb, 3);
1470 for (i = 0; i < spkr_remap_sets; i++) {
1471 /* std layout mask for each remap set */
1472 num_spkrs[i] = dca_exss_mask2count(get_bits(&s->gb, spkr_mask_size));
1475 for (i = 0; i < spkr_remap_sets; i++) {
1476 int num_dec_ch_remaps = get_bits(&s->gb, 5) + 1;
1477 if (get_bits_left(&s->gb) < 0)
1480 for (j = 0; j < num_spkrs[i]; j++) {
1481 int remap_dec_ch_mask = get_bits_long(&s->gb, num_dec_ch_remaps);
1482 int num_dec_ch = av_popcount(remap_dec_ch_mask);
1483 skip_bits_long(&s->gb, num_dec_ch * 5); // remap codes
1488 skip_bits(&s->gb, 3); // representation type
1492 drc_code_present = get_bits1(&s->gb);
1493 if (drc_code_present)
1494 get_bits(&s->gb, 8); // drc code
1496 if (get_bits1(&s->gb))
1497 skip_bits(&s->gb, 5); // dialog normalization code
1499 if (drc_code_present && embedded_stereo)
1500 get_bits(&s->gb, 8); // drc stereo code
1502 if (s->mix_metadata && get_bits1(&s->gb)) {
1503 skip_bits(&s->gb, 1); // external mix
1504 skip_bits(&s->gb, 6); // post mix gain code
1506 if (get_bits(&s->gb, 2) != 3) // mixer drc code
1507 skip_bits(&s->gb, 3); // drc limit
1509 skip_bits(&s->gb, 8); // custom drc code
1511 if (get_bits1(&s->gb)) // channel specific scaling
1512 for (i = 0; i < s->num_mix_configs; i++)
1513 skip_bits_long(&s->gb, s->mix_config_num_ch[i] * 6); // scale codes
1515 skip_bits_long(&s->gb, s->num_mix_configs * 6); // scale codes
1517 for (i = 0; i < s->num_mix_configs; i++) {
1518 if (get_bits_left(&s->gb) < 0)
1520 dca_exss_skip_mix_coeffs(&s->gb, channels, s->mix_config_num_ch[i]);
1522 dca_exss_skip_mix_coeffs(&s->gb, 6, s->mix_config_num_ch[i]);
1523 if (embedded_stereo)
1524 dca_exss_skip_mix_coeffs(&s->gb, 2, s->mix_config_num_ch[i]);
1528 switch (get_bits(&s->gb, 2)) {
1529 case 0: extensions_mask = get_bits(&s->gb, 12); break;
1530 case 1: extensions_mask = DCA_EXT_EXSS_XLL; break;
1531 case 2: extensions_mask = DCA_EXT_EXSS_LBR; break;
1532 case 3: extensions_mask = 0; /* aux coding */ break;
1535 /* not parsed further, we were only interested in the extensions mask */
1537 if (get_bits_left(&s->gb) < 0)
1540 if (get_bits_count(&s->gb) - header_pos > header_size * 8) {
1541 av_log(s->avctx, AV_LOG_WARNING, "Asset header size mismatch.\n");
1544 skip_bits_long(&s->gb, header_pos + header_size * 8 - get_bits_count(&s->gb));
1546 if (extensions_mask & DCA_EXT_EXSS_XLL)
1547 s->profile = FF_PROFILE_DTS_HD_MA;
1548 else if (extensions_mask & (DCA_EXT_EXSS_XBR | DCA_EXT_EXSS_X96 |
1550 s->profile = FF_PROFILE_DTS_HD_HRA;
1552 if (!(extensions_mask & DCA_EXT_CORE))
1553 av_log(s->avctx, AV_LOG_WARNING, "DTS core detection mismatch.\n");
1554 if ((extensions_mask & DCA_CORE_EXTS) != s->core_ext_mask)
1555 av_log(s->avctx, AV_LOG_WARNING,
1556 "DTS extensions detection mismatch (%d, %d)\n",
1557 extensions_mask & DCA_CORE_EXTS, s->core_ext_mask);
1563 * Parse extension substream header (HD)
1565 static void dca_exss_parse_header(DCAContext *s)
1571 int active_ss_mask[8];
1574 if (get_bits_left(&s->gb) < 52)
1577 skip_bits(&s->gb, 8); // user data
1578 ss_index = get_bits(&s->gb, 2);
1580 blownup = get_bits1(&s->gb);
1581 skip_bits(&s->gb, 8 + 4 * blownup); // header_size
1582 skip_bits(&s->gb, 16 + 4 * blownup); // hd_size
1584 s->static_fields = get_bits1(&s->gb);
1585 if (s->static_fields) {
1586 skip_bits(&s->gb, 2); // reference clock code
1587 skip_bits(&s->gb, 3); // frame duration code
1589 if (get_bits1(&s->gb))
1590 skip_bits_long(&s->gb, 36); // timestamp
1592 /* a single stream can contain multiple audio assets that can be
1593 * combined to form multiple audio presentations */
1595 num_audiop = get_bits(&s->gb, 3) + 1;
1596 if (num_audiop > 1) {
1597 av_log_ask_for_sample(s->avctx, "Multiple DTS-HD audio presentations.");
1598 /* ignore such streams for now */
1602 num_assets = get_bits(&s->gb, 3) + 1;
1603 if (num_assets > 1) {
1604 av_log_ask_for_sample(s->avctx, "Multiple DTS-HD audio assets.");
1605 /* ignore such streams for now */
1609 for (i = 0; i < num_audiop; i++)
1610 active_ss_mask[i] = get_bits(&s->gb, ss_index + 1);
1612 for (i = 0; i < num_audiop; i++)
1613 for (j = 0; j <= ss_index; j++)
1614 if (active_ss_mask[i] & (1 << j))
1615 skip_bits(&s->gb, 8); // active asset mask
1617 s->mix_metadata = get_bits1(&s->gb);
1618 if (s->mix_metadata) {
1619 int mix_out_mask_size;
1621 skip_bits(&s->gb, 2); // adjustment level
1622 mix_out_mask_size = (get_bits(&s->gb, 2) + 1) << 2;
1623 s->num_mix_configs = get_bits(&s->gb, 2) + 1;
1625 for (i = 0; i < s->num_mix_configs; i++) {
1626 int mix_out_mask = get_bits(&s->gb, mix_out_mask_size);
1627 s->mix_config_num_ch[i] = dca_exss_mask2count(mix_out_mask);
1632 for (i = 0; i < num_assets; i++)
1633 skip_bits_long(&s->gb, 16 + 4 * blownup); // asset size
1635 for (i = 0; i < num_assets; i++) {
1636 if (dca_exss_parse_asset_header(s))
1640 /* not parsed further, we were only interested in the extensions mask
1641 * from the asset header */
1645 * Main frame decoding function
1646 * FIXME add arguments
1648 static int dca_decode_frame(AVCodecContext *avctx, void *data,
1649 int *got_frame_ptr, AVPacket *avpkt)
1651 const uint8_t *buf = avpkt->data;
1652 int buf_size = avpkt->size;
1655 int num_core_channels = 0;
1658 int16_t *samples_s16;
1659 DCAContext *s = avctx->priv_data;
1666 s->dca_buffer_size = ff_dca_convert_bitstream(buf, buf_size, s->dca_buffer,
1667 DCA_MAX_FRAME_SIZE + DCA_MAX_EXSS_HEADER_SIZE);
1668 if (s->dca_buffer_size == AVERROR_INVALIDDATA) {
1669 av_log(avctx, AV_LOG_ERROR, "Not a valid DCA frame\n");
1670 return AVERROR_INVALIDDATA;
1673 init_get_bits(&s->gb, s->dca_buffer, s->dca_buffer_size * 8);
1674 if ((ret = dca_parse_frame_header(s)) < 0) {
1675 //seems like the frame is corrupt, try with the next one
1678 //set AVCodec values with parsed data
1679 avctx->sample_rate = s->sample_rate;
1680 avctx->bit_rate = s->bit_rate;
1682 s->profile = FF_PROFILE_DTS;
1684 for (i = 0; i < (s->sample_blocks / 8); i++) {
1685 if ((ret = dca_decode_block(s, 0, i))) {
1686 av_log(avctx, AV_LOG_ERROR, "error decoding block\n");
1691 /* record number of core channels incase less than max channels are requested */
1692 num_core_channels = s->prim_channels;
1695 s->core_ext_mask = dca_ext_audio_descr_mask[s->ext_descr];
1697 s->core_ext_mask = 0;
1699 core_ss_end = FFMIN(s->frame_size, s->dca_buffer_size) * 8;
1701 /* only scan for extensions if ext_descr was unknown or indicated a
1702 * supported XCh extension */
1703 if (s->core_ext_mask < 0 || s->core_ext_mask & DCA_EXT_XCH) {
1705 /* if ext_descr was unknown, clear s->core_ext_mask so that the
1706 * extensions scan can fill it up */
1707 s->core_ext_mask = FFMAX(s->core_ext_mask, 0);
1709 /* extensions start at 32-bit boundaries into bitstream */
1710 skip_bits_long(&s->gb, (-get_bits_count(&s->gb)) & 31);
1712 while (core_ss_end - get_bits_count(&s->gb) >= 32) {
1713 uint32_t bits = get_bits_long(&s->gb, 32);
1717 int ext_amode, xch_fsize;
1719 s->xch_base_channel = s->prim_channels;
1721 /* validate sync word using XCHFSIZE field */
1722 xch_fsize = show_bits(&s->gb, 10);
1723 if ((s->frame_size != (get_bits_count(&s->gb) >> 3) - 4 + xch_fsize) &&
1724 (s->frame_size != (get_bits_count(&s->gb) >> 3) - 4 + xch_fsize + 1))
1727 /* skip length-to-end-of-frame field for the moment */
1728 skip_bits(&s->gb, 10);
1730 s->core_ext_mask |= DCA_EXT_XCH;
1732 /* extension amode(number of channels in extension) should be 1 */
1733 /* AFAIK XCh is not used for more channels */
1734 if ((ext_amode = get_bits(&s->gb, 4)) != 1) {
1735 av_log(avctx, AV_LOG_ERROR, "XCh extension amode %d not"
1736 " supported!\n", ext_amode);
1740 /* much like core primary audio coding header */
1741 dca_parse_audio_coding_header(s, s->xch_base_channel);
1743 for (i = 0; i < (s->sample_blocks / 8); i++)
1744 if ((ret = dca_decode_block(s, s->xch_base_channel, i))) {
1745 av_log(avctx, AV_LOG_ERROR, "error decoding XCh extension\n");
1753 /* XXCh: extended channels */
1754 /* usually found either in core or HD part in DTS-HD HRA streams,
1755 * but not in DTS-ES which contains XCh extensions instead */
1756 s->core_ext_mask |= DCA_EXT_XXCH;
1760 int fsize96 = show_bits(&s->gb, 12) + 1;
1761 if (s->frame_size != (get_bits_count(&s->gb) >> 3) - 4 + fsize96)
1764 av_log(avctx, AV_LOG_DEBUG, "X96 extension found at %d bits\n",
1765 get_bits_count(&s->gb));
1766 skip_bits(&s->gb, 12);
1767 av_log(avctx, AV_LOG_DEBUG, "FSIZE96 = %d bytes\n", fsize96);
1768 av_log(avctx, AV_LOG_DEBUG, "REVNO = %d\n", get_bits(&s->gb, 4));
1770 s->core_ext_mask |= DCA_EXT_X96;
1775 skip_bits_long(&s->gb, (-get_bits_count(&s->gb)) & 31);
1778 /* no supported extensions, skip the rest of the core substream */
1779 skip_bits_long(&s->gb, core_ss_end - get_bits_count(&s->gb));
1782 if (s->core_ext_mask & DCA_EXT_X96)
1783 s->profile = FF_PROFILE_DTS_96_24;
1784 else if (s->core_ext_mask & (DCA_EXT_XCH | DCA_EXT_XXCH))
1785 s->profile = FF_PROFILE_DTS_ES;
1787 /* check for ExSS (HD part) */
1788 if (s->dca_buffer_size - s->frame_size > 32 &&
1789 get_bits_long(&s->gb, 32) == DCA_HD_MARKER)
1790 dca_exss_parse_header(s);
1792 avctx->profile = s->profile;
1794 channels = s->prim_channels + !!s->lfe;
1796 if (s->amode < 16) {
1797 avctx->channel_layout = dca_core_channel_layout[s->amode];
1799 if (s->xch_present && (!avctx->request_channels ||
1800 avctx->request_channels > num_core_channels + !!s->lfe)) {
1801 avctx->channel_layout |= AV_CH_BACK_CENTER;
1803 avctx->channel_layout |= AV_CH_LOW_FREQUENCY;
1804 s->channel_order_tab = dca_channel_reorder_lfe_xch[s->amode];
1806 s->channel_order_tab = dca_channel_reorder_nolfe_xch[s->amode];
1809 channels = num_core_channels + !!s->lfe;
1810 s->xch_present = 0; /* disable further xch processing */
1812 avctx->channel_layout |= AV_CH_LOW_FREQUENCY;
1813 s->channel_order_tab = dca_channel_reorder_lfe[s->amode];
1815 s->channel_order_tab = dca_channel_reorder_nolfe[s->amode];
1818 if (channels > !!s->lfe &&
1819 s->channel_order_tab[channels - 1 - !!s->lfe] < 0)
1820 return AVERROR_INVALIDDATA;
1822 if (avctx->request_channels == 2 && s->prim_channels > 2) {
1824 s->output = DCA_STEREO;
1825 avctx->channel_layout = AV_CH_LAYOUT_STEREO;
1828 av_log(avctx, AV_LOG_ERROR, "Non standard configuration %d !\n", s->amode);
1829 return AVERROR_INVALIDDATA;
1833 /* There is nothing that prevents a dts frame to change channel configuration
1834 but Libav doesn't support that so only set the channels if it is previously
1835 unset. Ideally during the first probe for channels the crc should be checked
1836 and only set avctx->channels when the crc is ok. Right now the decoder could
1837 set the channels based on a broken first frame.*/
1838 if (s->is_channels_set == 0) {
1839 s->is_channels_set = 1;
1840 avctx->channels = channels;
1842 if (avctx->channels != channels) {
1843 av_log(avctx, AV_LOG_ERROR, "DCA decoder does not support number of "
1844 "channels changing in stream. Skipping frame.\n");
1845 return AVERROR_PATCHWELCOME;
1848 /* get output buffer */
1849 s->frame.nb_samples = 256 * (s->sample_blocks / 8);
1850 if ((ret = avctx->get_buffer(avctx, &s->frame)) < 0) {
1851 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
1854 samples_flt = (float *) s->frame.data[0];
1855 samples_s16 = (int16_t *) s->frame.data[0];
1857 /* filter to get final output */
1858 for (i = 0; i < (s->sample_blocks / 8); i++) {
1859 dca_filter_channels(s, i);
1861 /* If this was marked as a DTS-ES stream we need to subtract back- */
1862 /* channel from SL & SR to remove matrixed back-channel signal */
1863 if ((s->source_pcm_res & 1) && s->xch_present) {
1864 float *back_chan = s->samples + s->channel_order_tab[s->xch_base_channel] * 256;
1865 float *lt_chan = s->samples + s->channel_order_tab[s->xch_base_channel - 2] * 256;
1866 float *rt_chan = s->samples + s->channel_order_tab[s->xch_base_channel - 1] * 256;
1867 s->dsp.vector_fmac_scalar(lt_chan, back_chan, -M_SQRT1_2, 256);
1868 s->dsp.vector_fmac_scalar(rt_chan, back_chan, -M_SQRT1_2, 256);
1871 if (avctx->sample_fmt == AV_SAMPLE_FMT_FLT) {
1872 s->fmt_conv.float_interleave(samples_flt, s->samples_chanptr, 256,
1874 samples_flt += 256 * channels;
1876 s->fmt_conv.float_to_int16_interleave(samples_s16,
1877 s->samples_chanptr, 256,
1879 samples_s16 += 256 * channels;
1883 /* update lfe history */
1884 lfe_samples = 2 * s->lfe * (s->sample_blocks / 8);
1885 for (i = 0; i < 2 * s->lfe * 4; i++)
1886 s->lfe_data[i] = s->lfe_data[i + lfe_samples];
1889 *(AVFrame *) data = s->frame;
1897 * DCA initialization
1899 * @param avctx pointer to the AVCodecContext
1902 static av_cold int dca_decode_init(AVCodecContext *avctx)
1904 DCAContext *s = avctx->priv_data;
1910 ff_dsputil_init(&s->dsp, avctx);
1911 ff_mdct_init(&s->imdct, 6, 1, 1.0);
1912 ff_synth_filter_init(&s->synth);
1913 ff_dcadsp_init(&s->dcadsp);
1914 ff_fmt_convert_init(&s->fmt_conv, avctx);
1916 for (i = 0; i < DCA_PRIM_CHANNELS_MAX + 1; i++)
1917 s->samples_chanptr[i] = s->samples + i * 256;
1919 if (avctx->request_sample_fmt == AV_SAMPLE_FMT_FLT) {
1920 avctx->sample_fmt = AV_SAMPLE_FMT_FLT;
1921 s->scale_bias = 1.0 / 32768.0;
1923 avctx->sample_fmt = AV_SAMPLE_FMT_S16;
1924 s->scale_bias = 1.0;
1927 /* allow downmixing to stereo */
1928 if (avctx->channels > 0 && avctx->request_channels < avctx->channels &&
1929 avctx->request_channels == 2) {
1930 avctx->channels = avctx->request_channels;
1933 avcodec_get_frame_defaults(&s->frame);
1934 avctx->coded_frame = &s->frame;
1939 static av_cold int dca_decode_end(AVCodecContext *avctx)
1941 DCAContext *s = avctx->priv_data;
1942 ff_mdct_end(&s->imdct);
1946 static const AVProfile profiles[] = {
1947 { FF_PROFILE_DTS, "DTS" },
1948 { FF_PROFILE_DTS_ES, "DTS-ES" },
1949 { FF_PROFILE_DTS_96_24, "DTS 96/24" },
1950 { FF_PROFILE_DTS_HD_HRA, "DTS-HD HRA" },
1951 { FF_PROFILE_DTS_HD_MA, "DTS-HD MA" },
1952 { FF_PROFILE_UNKNOWN },
1955 AVCodec ff_dca_decoder = {
1957 .type = AVMEDIA_TYPE_AUDIO,
1959 .priv_data_size = sizeof(DCAContext),
1960 .init = dca_decode_init,
1961 .decode = dca_decode_frame,
1962 .close = dca_decode_end,
1963 .long_name = NULL_IF_CONFIG_SMALL("DCA (DTS Coherent Acoustics)"),
1964 .capabilities = CODEC_CAP_CHANNEL_CONF | CODEC_CAP_DR1,
1965 .sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLT,
1967 AV_SAMPLE_FMT_NONE },
1968 .profiles = NULL_IF_CONFIG_SMALL(profiles),