All Data Structures Namespaces Files Functions Variables Typedefs Enumerations Enumerator Macros Groups Pages
Go to the documentation of this file.
1 /*
2  * Copyright (C) 2016 foo86
3  *
4  * This file is part of FFmpeg.
5  *
6  * FFmpeg is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU Lesser General Public
8  * License as published by the Free Software Foundation; either
9  * version 2.1 of the License, or (at your option) any later version.
10  *
11  * FFmpeg is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * Lesser General Public License for more details.
15  *
16  * You should have received a copy of the GNU Lesser General Public
17  * License along with FFmpeg; if not, write to the Free Software
18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19  */
24 #include "libavutil/common.h"
25 #include "libavutil/float_dsp.h"
26 #include "libavutil/fixed_dsp.h"
27 #include "libavutil/mem.h"
29 #include "avcodec.h"
30 #include "internal.h"
31 #include "get_bits.h"
32 #include "dca.h"
33 #include "dca_exss.h"
34 #include "dcadsp.h"
35 #include "dcadct.h"
36 #include "dcamath.h"
37 #include "dcahuff.h"
38 #include "fft.h"
39 #include "synth_filter.h"
41 #define DCA_CHANNELS 7
42 #define DCA_SUBBANDS 32
43 #define DCA_SUBBANDS_X96 64
44 #define DCA_SUBFRAMES 16
47 #define DCA_LFE_HISTORY 8
48 #define DCA_ABITS_MAX 26
54 #define DCA_EXSS_CHSETS_MAX 4
56 #define DCA_FILTER_MODE_X96 0x01
57 #define DCA_FILTER_MODE_FIXED 0x02
60  DCA_AMODE_MONO, // Mode 0: A (mono)
61  DCA_AMODE_MONO_DUAL, // Mode 1: A + B (dual mono)
62  DCA_AMODE_STEREO, // Mode 2: L + R (stereo)
63  DCA_AMODE_STEREO_SUMDIFF, // Mode 3: (L+R) + (L-R) (sum-diff)
64  DCA_AMODE_STEREO_TOTAL, // Mode 4: LT + RT (left and right total)
65  DCA_AMODE_3F, // Mode 5: C + L + R
66  DCA_AMODE_2F1R, // Mode 6: L + R + S
67  DCA_AMODE_3F1R, // Mode 7: C + L + R + S
68  DCA_AMODE_2F2R, // Mode 8: L + R + SL + SR
69  DCA_AMODE_3F2R, // Mode 9: C + L + R + SL + SR
72 };
78 };
85 };
87 typedef struct DCADSPData {
88  union {
89  struct {
90  DECLARE_ALIGNED(32, float, hist1)[1024];
91  DECLARE_ALIGNED(32, float, hist2)[64];
92  } flt;
93  struct {
96  } fix;
97  } u;
98  int offset;
99 } DCADSPData;
101 typedef struct DCACoreDecoder {
106  // Bit stream header
107  int crc_present; ///< CRC present flag
108  int npcmblocks; ///< Number of PCM sample blocks
109  int frame_size; ///< Primary frame byte size
110  int audio_mode; ///< Audio channel arrangement
111  int sample_rate; ///< Core audio sampling frequency
112  int bit_rate; ///< Transmission bit rate
113  int drc_present; ///< Embedded dynamic range flag
114  int ts_present; ///< Embedded time stamp flag
115  int aux_present; ///< Auxiliary data flag
116  int ext_audio_type; ///< Extension audio descriptor flag
117  int ext_audio_present; ///< Extended coding flag
118  int sync_ssf; ///< Audio sync word insertion flag
119  int lfe_present; ///< Low frequency effects flag
120  int predictor_history; ///< Predictor history flag switch
121  int filter_perfect; ///< Multirate interpolator switch
122  int source_pcm_res; ///< Source PCM resolution
123  int es_format; ///< Extended surround (ES) mastering flag
124  int sumdiff_front; ///< Front sum/difference flag
125  int sumdiff_surround; ///< Surround sum/difference flag
127  // Primary audio coding header
128  int nsubframes; ///< Number of subframes
129  int nchannels; ///< Number of primary audio channels (incl. extension channels)
130  int ch_mask; ///< Speaker layout mask (incl. LFE and extension channels)
131  int8_t nsubbands[DCA_CHANNELS]; ///< Subband activity count
132  int8_t subband_vq_start[DCA_CHANNELS]; ///< High frequency VQ start subband
133  int8_t joint_intensity_index[DCA_CHANNELS]; ///< Joint intensity coding index
134  int8_t transition_mode_sel[DCA_CHANNELS]; ///< Transient mode code book
135  int8_t scale_factor_sel[DCA_CHANNELS]; ///< Scale factor code book
136  int8_t bit_allocation_sel[DCA_CHANNELS]; ///< Bit allocation quantizer select
137  int8_t quant_index_sel[DCA_CHANNELS][DCA_CODE_BOOKS]; ///< Quantization index codebook select
138  int32_t scale_factor_adj[DCA_CHANNELS][DCA_CODE_BOOKS]; ///< Scale factor adjustment
140  // Primary audio coding side information
141  int8_t nsubsubframes[DCA_SUBFRAMES]; ///< Subsubframe count for each subframe
142  int8_t prediction_mode[DCA_CHANNELS][DCA_SUBBANDS_X96]; ///< Prediction mode
143  int16_t prediction_vq_index[DCA_CHANNELS][DCA_SUBBANDS_X96]; ///< Prediction coefficients VQ address
144  int8_t bit_allocation[DCA_CHANNELS][DCA_SUBBANDS_X96]; ///< Bit allocation index
145  int8_t transition_mode[DCA_SUBFRAMES][DCA_CHANNELS][DCA_SUBBANDS]; ///< Transition mode
146  int32_t scale_factors[DCA_CHANNELS][DCA_SUBBANDS][2]; ///< Scale factors (2x for transients and X96)
147  int8_t joint_scale_sel[DCA_CHANNELS]; ///< Joint subband codebook select
148  int32_t joint_scale_factors[DCA_CHANNELS][DCA_SUBBANDS_X96]; ///< Scale factors for joint subband coding
150  // Auxiliary data
151  int prim_dmix_embedded; ///< Auxiliary dynamic downmix flag
152  int prim_dmix_type; ///< Auxiliary primary channel downmix type
153  int prim_dmix_coeff[DCA_DMIX_CHANNELS_MAX * DCA_CORE_CHANNELS_MAX]; ///< Dynamic downmix code coefficients
155  // Core extensions
156  int ext_audio_mask; ///< Bit mask of fully decoded core extensions
158  // XCH extension data
159  int xch_pos; ///< Bit position of XCH frame in core substream
161  // XXCH extension data
162  int xxch_crc_present; ///< CRC presence flag for XXCH channel set header
163  int xxch_mask_nbits; ///< Number of bits for loudspeaker mask
164  int xxch_core_mask; ///< Core loudspeaker activity mask
165  int xxch_spkr_mask; ///< Loudspeaker layout mask
166  int xxch_dmix_embedded; ///< Downmix already performed by encoder
167  int xxch_dmix_scale_inv; ///< Downmix scale factor
168  int xxch_dmix_mask[DCA_XXCH_CHANNELS_MAX]; ///< Downmix channel mapping mask
170  int xxch_pos; ///< Bit position of XXCH frame in core substream
172  // X96 extension data
173  int x96_rev_no; ///< X96 revision number
174  int x96_crc_present; ///< CRC presence flag for X96 channel set header
175  int x96_nchannels; ///< Number of primary channels in X96 extension
176  int x96_high_res; ///< X96 high resolution flag
177  int x96_subband_start; ///< First encoded subband in X96 extension
178  int x96_rand; ///< Random seed for generating samples for unallocated X96 subbands
179  int x96_pos; ///< Bit position of X96 frame in core substream
181  // Sample buffers
182  unsigned int x96_subband_size;
183  int32_t *x96_subband_buffer; ///< X96 subband sample buffer base
186  unsigned int subband_size;
187  int32_t *subband_buffer; ///< Subband sample buffer base
189  int32_t *lfe_samples; ///< Decimated LFE samples
191  // DSP contexts
192  DCADSPData dcadsp_data[DCA_CHANNELS]; ///< FIR history buffers
200  // PCM output data
201  unsigned int output_size;
202  void *output_buffer; ///< PCM output buffer base
203  int32_t *output_samples[DCA_SPEAKER_COUNT]; ///< PCM output for fixed point mode
204  int32_t output_history_lfe_fixed; ///< LFE PCM history for X96 filter
205  float output_history_lfe_float; ///< LFE PCM history for X96 filter
207  int ch_remap[DCA_SPEAKER_COUNT]; ///< Channel to speaker map
208  int request_mask; ///< Requested channel layout (for stereo downmix)
210  int npcmsamples; ///< Number of PCM samples per channel
211  int output_rate; ///< Output sample rate (1x or 2x header rate)
213  int filter_mode; ///< Previous filtering mode for detecting changes
216 static inline int ff_dca_core_map_spkr(DCACoreDecoder *core, int spkr)
217 {
218  if (core->ch_mask & (1U << spkr))
219  return spkr;
220  if (spkr == DCA_SPEAKER_Lss && (core->ch_mask & DCA_SPEAKER_MASK_Ls))
221  return DCA_SPEAKER_Ls;
222  if (spkr == DCA_SPEAKER_Rss && (core->ch_mask & DCA_SPEAKER_MASK_Rs))
223  return DCA_SPEAKER_Rs;
224  return -1;
225 }
227 static inline void ff_dca_core_dequantize(int32_t *output, const int32_t *input,
228  int32_t step_size, int32_t scale, int residual, int len)
229 {
230  // Account for quantizer step size
231  int64_t step_scale = (int64_t)step_size * scale;
232  int n, shift = 0;
234  // Limit scale factor resolution to 22 bits
235  if (step_scale > (1 << 23)) {
236  shift = av_log2(step_scale >> 23) + 1;
237  step_scale >>= shift;
238  }
240  // Scale the samples
241  if (residual) {
242  for (n = 0; n < len; n++)
243  output[n] += clip23(norm__(input[n] * step_scale, 22 - shift));
244  } else {
245  for (n = 0; n < len; n++)
246  output[n] = clip23(norm__(input[n] * step_scale, 22 - shift));
247  }
248 }
252 int ff_dca_core_filter_fixed(DCACoreDecoder *s, int x96_synth);
258 #endif
int audio_mode
Audio channel arrangement.
Definition: dca_core.h:110
int16_t prediction_vq_index[DCA_CHANNELS][DCA_SUBBANDS_X96]
Prediction coefficients VQ address.
Definition: dca_core.h:143
int xxch_mask_nbits
Number of bits for loudspeaker mask.
Definition: dca_core.h:163
int offset
Definition: dca_core.h:98
static int shift(int a, int b)
Definition: sonic.c:82
Dynamic downmix code coefficients.
Definition: dca_core.h:153
This structure describes decoded (raw) audio or video data.
Definition: frame.h:226
ptrdiff_t const GLvoid * data
Definition: opengl_enc.c:101
Memory handling functions.
int xxch_dmix_embedded
Downmix already performed by encoder.
Definition: dca_core.h:166
int ext_audio_type
Extension audio descriptor flag.
Definition: dca_core.h:116
int frame_size
Primary frame byte size.
Definition: dca_core.h:109
unsigned int output_size
Definition: dca_core.h:201
int8_t joint_scale_sel[DCA_CHANNELS]
Joint subband codebook select.
Definition: dca_core.h:147
int av_log2(unsigned v)
Definition: intmath.c:26
int8_t joint_intensity_index[DCA_CHANNELS]
Joint intensity coding index.
Definition: dca_core.h:133
int filter_perfect
Multirate interpolator switch.
Definition: dca_core.h:121
float output_history_lfe_float
LFE PCM history for X96 filter.
Definition: dca_core.h:205
Definition: dca_core.h:50
Definition: dca_core.h:44
unsigned int x96_subband_size
Definition: dca_core.h:182
int nsubframes
Number of subframes.
Definition: dca_core.h:128
DCADSPData dcadsp_data[DCA_CHANNELS]
FIR history buffers.
Definition: dca_core.h:192
struct DCADSPData::@70::@72 fix
int32_t scale_factor_adj[DCA_CHANNELS][DCA_CODE_BOOKS]
Scale factor adjustment.
Definition: dca_core.h:138
static int32_t clip23(int32_t a)
Definition: dcamath.h:54
int x96_rand
Random seed for generating samples for unallocated X96 subbands.
Definition: dca_core.h:178
Definition: dca_core.h:74
int8_t prediction_mode[DCA_CHANNELS][DCA_SUBBANDS_X96]
Prediction mode.
Definition: dca_core.h:142
#define av_cold
Definition: attributes.h:82
union DCADSPData::@70 u
int source_pcm_res
Source PCM resolution.
Definition: dca_core.h:122
int xxch_dmix_scale_inv
Downmix scale factor.
Definition: dca_core.h:167
int32_t * subband_samples[DCA_CHANNELS][DCA_SUBBANDS]
Subband samples.
Definition: dca_core.h:188
Definition: dca_core.h:51
int filter_mode
Previous filtering mode for detecting changes.
Definition: dca_core.h:213
static AVFrame * frame
void * output_buffer
PCM output buffer base.
Definition: dca_core.h:202
#define DECLARE_ALIGNED(n, t, v)
Declare a variable that is aligned in memory.
Definition: mem.h:112
#define DCA_SUBBANDS_X96
Definition: dca_core.h:43
int prim_dmix_type
Auxiliary primary channel downmix type.
Definition: dca_core.h:152
bitstream reader API header.
int32_t * x96_subband_buffer
X96 subband sample buffer base.
Definition: dca_core.h:183
static void ff_dca_core_dequantize(int32_t *output, const int32_t *input, int32_t step_size, int32_t scale, int residual, int len)
Definition: dca_core.h:227
ptrdiff_t size
Definition: opengl_enc.c:101
int ff_dca_core_parse_exss(DCACoreDecoder *s, uint8_t *data, DCAExssAsset *asset)
Definition: dca_core.c:1831
av_cold void ff_dca_core_flush(DCACoreDecoder *s)
Definition: dca_core.c:2399
int sync_ssf
Audio sync word insertion flag.
Definition: dca_core.h:118
int32_t * subband_buffer
Subband sample buffer base.
Definition: dca_core.h:187
int npcmsamples
Number of PCM samples per channel.
Definition: dca_core.h:210
int8_t subband_vq_start[DCA_CHANNELS]
High frequency VQ start subband.
Definition: dca_core.h:132
#define U(x)
Definition: vp56_arith.h:37
int8_t nsubbands[DCA_CHANNELS]
Subband activity count.
Definition: dca_core.h:131
int sumdiff_front
Front sum/difference flag.
Definition: dca_core.h:124
int8_t nsubsubframes[DCA_SUBFRAMES]
Subsubframe count for each subframe.
Definition: dca_core.h:141
SynthFilterContext synth
Definition: dca_core.h:196
int8_t transition_mode_sel[DCA_CHANNELS]
Transient mode code book.
Definition: dca_core.h:134
int bit_rate
Transmission bit rate.
Definition: dca_core.h:112
int ff_dca_core_parse(DCACoreDecoder *s, uint8_t *data, int size)
Definition: dca_core.c:1798
int xxch_crc_present
CRC presence flag for XXCH channel set header.
Definition: dca_core.h:162
DCADCTContext dcadct
Definition: dca_core.h:194
AVFloatDSPContext * float_dsp
Definition: dca_core.h:197
int ff_dca_core_filter_fixed(DCACoreDecoder *s, int x96_synth)
Definition: dca_core.c:1959
int aux_present
Auxiliary data flag.
Definition: dca_core.h:115
int32_t * lfe_samples
Decimated LFE samples.
Definition: dca_core.h:189
uint64_t residual
Definition: dirac_vlc.h:29
int prim_dmix_embedded
Auxiliary dynamic downmix flag.
Definition: dca_core.h:151
int sample_rate
Core audio sampling frequency.
Definition: dca_core.h:111
int request_mask
Requested channel layout (for stereo downmix)
Definition: dca_core.h:208
Definition: fft.h:88
int output_rate
Output sample rate (1x or 2x header rate)
Definition: dca_core.h:211
int nchannels
Number of primary audio channels (incl. extension channels)
Definition: dca_core.h:129
static int ff_dca_core_map_spkr(DCACoreDecoder *core, int spkr)
Definition: dca_core.h:216
int xxch_pos
Bit position of XXCH frame in core substream.
Definition: dca_core.h:170
int sumdiff_surround
Surround sum/difference flag.
Definition: dca_core.h:125
AVCodecContext * avctx
Definition: dca_core.h:102
int x96_crc_present
CRC presence flag for X96 channel set header.
Definition: dca_core.h:174
#define s(width, name)
Definition: cbs_vp9.c:257
int n
Definition: avisynth_c.h:684
float hist2[64]
Definition: dca_core.h:91
av_cold int ff_dca_core_init(DCACoreDecoder *s)
Definition: dca_core.c:2412
int xxch_core_mask
Core loudspeaker activity mask.
Definition: dca_core.h:164
Definition: dca_core.h:42
Libavcodec external API header.
int ts_present
Embedded time stamp flag.
Definition: dca_core.h:114
int xxch_spkr_mask
Loudspeaker layout mask.
Definition: dca_core.h:165
int crc_present
CRC present flag.
Definition: dca_core.h:107
Definition: dcahuff.h:32
main external API structure.
Definition: avcodec.h:1533
int8_t bit_allocation_sel[DCA_CHANNELS]
Bit allocation quantizer select.
Definition: dca_core.h:136
int ext_audio_present
Extended coding flag.
Definition: dca_core.h:117
int es_format
Extended surround (ES) mastering flag.
Definition: dca_core.h:123
int x96_subband_start
First encoded subband in X96 extension.
Definition: dca_core.h:177
Downmix coefficients.
Definition: dca_core.h:169
int x96_pos
Bit position of X96 frame in core substream.
Definition: dca_core.h:179
int xch_pos
Bit position of XCH frame in core substream.
Definition: dca_core.h:159
int xxch_dmix_mask[DCA_XXCH_CHANNELS_MAX]
Downmix channel mapping mask.
Definition: dca_core.h:168
int32_t * x96_subband_samples[DCA_CHANNELS][DCA_SUBBANDS_X96]
X96 subband samples.
Definition: dca_core.h:184
int8_t bit_allocation[DCA_CHANNELS][DCA_SUBBANDS_X96]
Bit allocation index.
Definition: dca_core.h:144
DCADSPContext * dcadsp
Definition: dca_core.h:193
int x96_rev_no
X96 revision number.
Definition: dca_core.h:173
Transition mode.
Definition: dca_core.h:145
int32_t * output_samples[DCA_SPEAKER_COUNT]
PCM output for fixed point mode.
Definition: dca_core.h:203
Definition: dca_core.h:80
int x96_nchannels
Number of primary channels in X96 extension.
Definition: dca_core.h:175
float hist1[1024]
Definition: dca_core.h:90
int32_t joint_scale_factors[DCA_CHANNELS][DCA_SUBBANDS_X96]
Scale factors for joint subband coding.
Definition: dca_core.h:148
Definition: dca_core.h:41
unsigned int subband_size
Definition: dca_core.h:186
int lfe_present
Low frequency effects flag.
Definition: dca_core.h:119
int8_t scale_factor_sel[DCA_CHANNELS]
Scale factor code book.
Definition: dca_core.h:135
Definition: dca_core.h:59
struct DCADSPData::@70::@71 flt
int32_t scale_factors[DCA_CHANNELS][DCA_SUBBANDS][2]
Scale factors (2x for transients and X96)
Definition: dca_core.h:146
int ch_remap[DCA_SPEAKER_COUNT]
Channel to speaker map.
Definition: dca_core.h:207
common internal api header.
Definition: dca_core.h:52
common internal and external API header
GetBitContext gb_in
Definition: dca_core.h:104
AVFixedDSPContext * fixed_dsp
Definition: dca_core.h:198
int len
GetBitContext gb
Definition: dca_core.h:103
static int32_t norm__(int64_t a, int bits)
Definition: dcamath.h:27
int ch_mask
Speaker layout mask (incl. LFE and extension channels)
Definition: dca_core.h:130
av_cold void ff_dca_core_close(DCACoreDecoder *s)
Definition: dca_core.c:2430
int drc_present
Embedded dynamic range flag.
Definition: dca_core.h:113
int ff_dca_core_filter_frame(DCACoreDecoder *s, AVFrame *frame)
Definition: dca_core.c:2345
int x96_high_res
X96 high resolution flag.
Definition: dca_core.h:176
int ext_audio_mask
Bit mask of fully decoded core extensions.
Definition: dca_core.h:156
int predictor_history
Predictor history flag switch.
Definition: dca_core.h:120
int32_t output_history_lfe_fixed
LFE PCM history for X96 filter.
Definition: dca_core.h:204
int8_t quant_index_sel[DCA_CHANNELS][DCA_CODE_BOOKS]
Quantization index codebook select.
Definition: dca_core.h:137
FFTContext imdct[2]
Definition: dca_core.h:195
int npcmblocks
Number of PCM sample blocks.
Definition: dca_core.h:108