FFmpeg
ac3dec.h
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1 /*
2  * Common code between the AC-3 and E-AC-3 decoders
3  * Copyright (c) 2007 Bartlomiej Wolowiec <bartek.wolowiec@gmail.com>
4  *
5  * This file is part of FFmpeg.
6  *
7  * FFmpeg is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU Lesser General Public
9  * License as published by the Free Software Foundation; either
10  * version 2.1 of the License, or (at your option) any later version.
11  *
12  * FFmpeg is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15  * Lesser General Public License for more details.
16  *
17  * You should have received a copy of the GNU Lesser General Public
18  * License along with FFmpeg; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21 
22 /**
23  * @file
24  * Common code between the AC-3 and E-AC-3 decoders.
25  *
26  * Summary of MDCT Coefficient Grouping:
27  * The individual MDCT coefficient indices are often referred to in the
28  * (E-)AC-3 specification as frequency bins. These bins are grouped together
29  * into subbands of 12 coefficients each. The subbands are grouped together
30  * into bands as defined in the bitstream by the band structures, which
31  * determine the number of bands and the size of each band. The full spectrum
32  * of 256 frequency bins is divided into 1 DC bin + 21 subbands = 253 bins.
33  * This system of grouping coefficients is used for channel bandwidth, stereo
34  * rematrixing, channel coupling, enhanced coupling, and spectral extension.
35  *
36  * +-+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+-+
37  * |1| |12| | [12|12|12|12] | | | | | | | | | | | | |3|
38  * +-+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+-+
39  * ~~~ ~~~~ ~~~~~~~~~~~~~ ~~~
40  * | | | |
41  * | | | 3 unused frequency bins--+
42  * | | |
43  * | | +--1 band containing 4 subbands
44  * | |
45  * | +--1 subband of 12 frequency bins
46  * |
47  * +--DC frequency bin
48  */
49 
50 #ifndef AVCODEC_AC3DEC_H
51 #define AVCODEC_AC3DEC_H
52 
53 #include "libavutil/float_dsp.h"
54 #include "libavutil/fixed_dsp.h"
55 #include "libavutil/lfg.h"
56 #include "ac3.h"
57 #include "ac3dsp.h"
58 #include "bswapdsp.h"
59 #include "get_bits.h"
60 #include "fft.h"
61 #include "fmtconvert.h"
62 
63 #define AC3_OUTPUT_LFEON 8
64 
65 #define SPX_MAX_BANDS 17
66 
67 /** Large enough for maximum possible frame size when the specification limit is ignored */
68 #define AC3_FRAME_BUFFER_SIZE 32768
69 
70 typedef struct AC3DecodeContext {
71  AVClass *class; ///< class for AVOptions
72  AVCodecContext *avctx; ///< parent context
73  GetBitContext gbc; ///< bitstream reader
74 
75 ///@name Bit stream information
76 ///@{
77  int frame_type; ///< frame type (strmtyp)
78  int substreamid; ///< substream identification
79  int superframe_size; ///< current superframe size, in bytes
80  int frame_size; ///< current frame size, in bytes
81  int bit_rate; ///< stream bit rate, in bits-per-second
82  int sample_rate; ///< sample frequency, in Hz
83  int num_blocks; ///< number of audio blocks
84  int bitstream_id; ///< bitstream id (bsid)
85  int bitstream_mode; ///< bitstream mode (bsmod)
86  int channel_mode; ///< channel mode (acmod)
87  int lfe_on; ///< lfe channel in use
88  int dialog_normalization[2]; ///< dialog level in dBFS (dialnorm)
89  int compression_exists[2]; ///< compression field is valid for frame (compre)
90  int compression_gain[2]; ///< gain to apply for heavy compression (compr)
91  int channel_map; ///< custom channel map (chanmap)
92  int preferred_downmix; ///< Preferred 2-channel downmix mode (dmixmod)
93  int center_mix_level; ///< Center mix level index
94  int center_mix_level_ltrt; ///< Center mix level index for Lt/Rt (ltrtcmixlev)
95  int surround_mix_level; ///< Surround mix level index
96  int surround_mix_level_ltrt; ///< Surround mix level index for Lt/Rt (ltrtsurmixlev)
97  int lfe_mix_level_exists; ///< indicates if lfemixlevcod is specified (lfemixlevcode)
98  int lfe_mix_level; ///< LFE mix level index (lfemixlevcod)
99  int eac3; ///< indicates if current frame is E-AC-3
100  int eac3_frame_dependent_found; ///< bitstream has E-AC-3 dependent frame(s)
101  int eac3_subsbtreamid_found; ///< bitstream has E-AC-3 additional substream(s)
102  int dolby_surround_mode; ///< dolby surround mode (dsurmod)
103  int dolby_surround_ex_mode; ///< dolby surround ex mode (dsurexmod)
104  int dolby_headphone_mode; ///< dolby headphone mode (dheadphonmod)
105 ///@}
106 
107  int preferred_stereo_downmix;
108  float ltrt_center_mix_level;
109  float ltrt_surround_mix_level;
110  float loro_center_mix_level;
111  float loro_surround_mix_level;
112  int target_level; ///< target level in dBFS
113  float level_gain[2];
114 
115 ///@name Frame syntax parameters
116  int snr_offset_strategy; ///< SNR offset strategy (snroffststr)
117  int block_switch_syntax; ///< block switch syntax enabled (blkswe)
118  int dither_flag_syntax; ///< dither flag syntax enabled (dithflage)
119  int bit_allocation_syntax; ///< bit allocation model syntax enabled (bamode)
120  int fast_gain_syntax; ///< fast gain codes enabled (frmfgaincode)
121  int dba_syntax; ///< delta bit allocation syntax enabled (dbaflde)
122  int skip_syntax; ///< skip field syntax enabled (skipflde)
123  ///@}
124 
125 ///@name Standard coupling
126  int cpl_in_use[AC3_MAX_BLOCKS]; ///< coupling in use (cplinu)
127  int cpl_strategy_exists[AC3_MAX_BLOCKS];///< coupling strategy exists (cplstre)
128  int channel_in_cpl[AC3_MAX_CHANNELS]; ///< channel in coupling (chincpl)
129  int phase_flags_in_use; ///< phase flags in use (phsflginu)
130  int phase_flags[AC3_MAX_CPL_BANDS]; ///< phase flags (phsflg)
131  int num_cpl_bands; ///< number of coupling bands (ncplbnd)
132  uint8_t cpl_band_struct[AC3_MAX_CPL_BANDS];
133  uint8_t cpl_band_sizes[AC3_MAX_CPL_BANDS]; ///< number of coeffs in each coupling band
134  int firstchincpl; ///< first channel in coupling
135  int first_cpl_coords[AC3_MAX_CHANNELS]; ///< first coupling coordinates states (firstcplcos)
136  int cpl_coords[AC3_MAX_CHANNELS][AC3_MAX_CPL_BANDS]; ///< coupling coordinates (cplco)
137 ///@}
138 
139 ///@name Spectral extension
140 ///@{
141  int spx_in_use; ///< spectral extension in use (spxinu)
142  uint8_t channel_uses_spx[AC3_MAX_CHANNELS]; ///< channel uses spectral extension (chinspx)
143  int8_t spx_atten_code[AC3_MAX_CHANNELS]; ///< spx attenuation code (spxattencod)
144  int spx_src_start_freq; ///< spx start frequency bin
145  int spx_dst_end_freq; ///< spx end frequency bin
146  int spx_dst_start_freq; ///< spx starting frequency bin for copying (copystartmant)
147  ///< the copy region ends at the start of the spx region.
148  int num_spx_bands; ///< number of spx bands (nspxbnds)
149  uint8_t spx_band_struct[SPX_MAX_BANDS];
150  uint8_t spx_band_sizes[SPX_MAX_BANDS]; ///< number of bins in each spx band
151  uint8_t first_spx_coords[AC3_MAX_CHANNELS]; ///< first spx coordinates states (firstspxcos)
152  INTFLOAT spx_noise_blend[AC3_MAX_CHANNELS][SPX_MAX_BANDS]; ///< spx noise blending factor (nblendfact)
153  INTFLOAT spx_signal_blend[AC3_MAX_CHANNELS][SPX_MAX_BANDS];///< spx signal blending factor (sblendfact)
154 ///@}
155 
156 ///@name Adaptive hybrid transform
157  int channel_uses_aht[AC3_MAX_CHANNELS]; ///< channel AHT in use (chahtinu)
158  int pre_mantissa[AC3_MAX_CHANNELS][AC3_MAX_COEFS][AC3_MAX_BLOCKS]; ///< pre-IDCT mantissas
159 ///@}
160 
161 ///@name Channel
162  int fbw_channels; ///< number of full-bandwidth channels
163  int channels; ///< number of total channels
164  int lfe_ch; ///< index of LFE channel
165  SHORTFLOAT *downmix_coeffs[2]; ///< stereo downmix coefficients
166  int downmixed; ///< indicates if coeffs are currently downmixed
167  int output_mode; ///< output channel configuration
168  int prev_output_mode; ///< output channel configuration for previous frame
169  int out_channels; ///< number of output channels
170  int prev_bit_rate; ///< stream bit rate, in bits-per-second for previous frame
171 ///@}
172 
173 ///@name Dynamic range
174  INTFLOAT dynamic_range[2]; ///< dynamic range
175  INTFLOAT drc_scale; ///< percentage of dynamic range compression to be applied
176  int heavy_compression; ///< apply heavy compression
177  INTFLOAT heavy_dynamic_range[2]; ///< heavy dynamic range compression
178 ///@}
179 
180 ///@name Bandwidth
181  int start_freq[AC3_MAX_CHANNELS]; ///< start frequency bin (strtmant)
182  int end_freq[AC3_MAX_CHANNELS]; ///< end frequency bin (endmant)
183 ///@}
184 
185 ///@name Consistent noise generation
186  int consistent_noise_generation; ///< seed noise generation with AC-3 frame on decode
187 ///@}
188 
189 ///@name Rematrixing
190  int num_rematrixing_bands; ///< number of rematrixing bands (nrematbnd)
191  int rematrixing_flags[4]; ///< rematrixing flags (rematflg)
192 ///@}
193 
194 ///@name Exponents
195  int num_exp_groups[AC3_MAX_CHANNELS]; ///< Number of exponent groups (nexpgrp)
196  int8_t dexps[AC3_MAX_CHANNELS][AC3_MAX_COEFS]; ///< decoded exponents
197  int exp_strategy[AC3_MAX_BLOCKS][AC3_MAX_CHANNELS]; ///< exponent strategies (expstr)
198 ///@}
199 
200 ///@name Bit allocation
201  AC3BitAllocParameters bit_alloc_params; ///< bit allocation parameters
202  int first_cpl_leak; ///< first coupling leak state (firstcplleak)
203  int snr_offset[AC3_MAX_CHANNELS]; ///< signal-to-noise ratio offsets (snroffst)
204  int fast_gain[AC3_MAX_CHANNELS]; ///< fast gain values/SMR's (fgain)
205  uint8_t bap[AC3_MAX_CHANNELS][AC3_MAX_COEFS]; ///< bit allocation pointers
206  int16_t psd[AC3_MAX_CHANNELS][AC3_MAX_COEFS]; ///< scaled exponents
207  int16_t band_psd[AC3_MAX_CHANNELS][AC3_CRITICAL_BANDS]; ///< interpolated exponents
208  int16_t mask[AC3_MAX_CHANNELS][AC3_CRITICAL_BANDS]; ///< masking curve values
209  int dba_mode[AC3_MAX_CHANNELS]; ///< delta bit allocation mode
210  int dba_nsegs[AC3_MAX_CHANNELS]; ///< number of delta segments
211  uint8_t dba_offsets[AC3_MAX_CHANNELS][8]; ///< delta segment offsets
212  uint8_t dba_lengths[AC3_MAX_CHANNELS][8]; ///< delta segment lengths
213  uint8_t dba_values[AC3_MAX_CHANNELS][8]; ///< delta values for each segment
214 ///@}
215 
216 ///@name Zero-mantissa dithering
217  int dither_flag[AC3_MAX_CHANNELS]; ///< dither flags (dithflg)
218  AVLFG dith_state; ///< for dither generation
219 ///@}
220 
221 ///@name IMDCT
222  int block_switch[AC3_MAX_CHANNELS]; ///< block switch flags (blksw)
223  FFTContext imdct_512; ///< for 512 sample IMDCT
224  FFTContext imdct_256; ///< for 256 sample IMDCT
225 ///@}
226 
227 ///@name Optimization
228  BswapDSPContext bdsp;
229 #if USE_FIXED
230  AVFixedDSPContext *fdsp;
231 #else
232  AVFloatDSPContext *fdsp;
233 #endif
234  AC3DSPContext ac3dsp;
235  FmtConvertContext fmt_conv; ///< optimized conversion functions
236 ///@}
237 
238  SHORTFLOAT *outptr[AC3_MAX_CHANNELS];
239  INTFLOAT *xcfptr[AC3_MAX_CHANNELS];
240  INTFLOAT *dlyptr[AC3_MAX_CHANNELS];
241 
242 ///@name Aligned arrays
243  DECLARE_ALIGNED(16, int, fixed_coeffs)[AC3_MAX_CHANNELS][AC3_MAX_COEFS]; ///< fixed-point transform coefficients
244  DECLARE_ALIGNED(32, INTFLOAT, transform_coeffs)[AC3_MAX_CHANNELS][AC3_MAX_COEFS]; ///< transform coefficients
245  DECLARE_ALIGNED(32, INTFLOAT, delay)[EAC3_MAX_CHANNELS][AC3_BLOCK_SIZE]; ///< delay - added to the next block
246  DECLARE_ALIGNED(32, INTFLOAT, window)[AC3_BLOCK_SIZE]; ///< window coefficients
247  DECLARE_ALIGNED(32, INTFLOAT, tmp_output)[AC3_BLOCK_SIZE]; ///< temporary storage for output before windowing
248  DECLARE_ALIGNED(32, SHORTFLOAT, output)[EAC3_MAX_CHANNELS][AC3_BLOCK_SIZE]; ///< output after imdct transform and windowing
249  DECLARE_ALIGNED(32, uint8_t, input_buffer)[AC3_FRAME_BUFFER_SIZE + AV_INPUT_BUFFER_PADDING_SIZE]; ///< temp buffer to prevent overread
250  DECLARE_ALIGNED(32, SHORTFLOAT, output_buffer)[EAC3_MAX_CHANNELS][AC3_BLOCK_SIZE * 6]; ///< final output buffer
251 ///@}
252 } AC3DecodeContext;
253 
254 /**
255  * Parse the E-AC-3 frame header.
256  * This parses both the bit stream info and audio frame header.
257  */
258 static int ff_eac3_parse_header(AC3DecodeContext *s);
259 
260 /**
261  * Decode mantissas in a single channel for the entire frame.
262  * This is used when AHT mode is enabled.
263  */
264 static void ff_eac3_decode_transform_coeffs_aht_ch(AC3DecodeContext *s, int ch);
265 
266 /**
267  * Apply spectral extension to each channel by copying lower frequency
268  * coefficients to higher frequency bins and applying side information to
269  * approximate the original high frequency signal.
270  */
271 static void ff_eac3_apply_spectral_extension(AC3DecodeContext *s);
272 
273 #if (!USE_FIXED)
274 extern float ff_ac3_heavy_dynamic_range_tab[256];
275 #endif
276 
277 #endif /* AVCODEC_AC3DEC_H */
bswapdsp.h
ff_eac3_parse_header
static int ff_eac3_parse_header(AC3DecodeContext *s)
Definition: eac3dec.c:289
ch
uint8_t pi<< 24) CONV_FUNC(AV_SAMPLE_FMT_S64, int64_t, AV_SAMPLE_FMT_U8,(uint64_t)((*(const uint8_t *) pi - 0x80U))<< 56) CONV_FUNC(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_U8,(*(const uint8_t *) pi - 0x80) *(1.0f/(1<< 7))) CONV_FUNC(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_U8,(*(const uint8_t *) pi - 0x80) *(1.0/(1<< 7))) CONV_FUNC(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_S16,(*(const int16_t *) pi >>8)+0x80) CONV_FUNC(AV_SAMPLE_FMT_S64, int64_t, AV_SAMPLE_FMT_S16,(uint64_t)(*(const int16_t *) pi)<< 48) CONV_FUNC(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_S16, *(const int16_t *) pi *(1.0f/(1<< 15))) CONV_FUNC(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_S16, *(const int16_t *) pi *(1.0/(1<< 15))) CONV_FUNC(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_S32,(*(const int32_t *) pi >>24)+0x80) CONV_FUNC(AV_SAMPLE_FMT_S64, int64_t, AV_SAMPLE_FMT_S32,(uint64_t)(*(const int32_t *) pi)<< 32) CONV_FUNC(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_S32, *(const int32_t *) pi *(1.0f/(1U<< 31))) CONV_FUNC(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_S32, *(const int32_t *) pi *(1.0/(1U<< 31))) CONV_FUNC(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_S64,(*(const int64_t *) pi >>56)+0x80) CONV_FUNC(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_S64, *(const int64_t *) pi *(1.0f/(INT64_C(1)<< 63))) CONV_FUNC(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_S64, *(const int64_t *) pi *(1.0/(INT64_C(1)<< 63))) CONV_FUNC(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_FLT, av_clip_uint8(lrintf(*(const float *) pi *(1<< 7))+0x80)) CONV_FUNC(AV_SAMPLE_FMT_S16, int16_t, AV_SAMPLE_FMT_FLT, av_clip_int16(lrintf(*(const float *) pi *(1<< 15)))) CONV_FUNC(AV_SAMPLE_FMT_S32, int32_t, AV_SAMPLE_FMT_FLT, av_clipl_int32(llrintf(*(const float *) pi *(1U<< 31)))) CONV_FUNC(AV_SAMPLE_FMT_S64, int64_t, AV_SAMPLE_FMT_FLT, llrintf(*(const float *) pi *(INT64_C(1)<< 63))) CONV_FUNC(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_DBL, av_clip_uint8(lrint(*(const double *) pi *(1<< 7))+0x80)) CONV_FUNC(AV_SAMPLE_FMT_S16, int16_t, AV_SAMPLE_FMT_DBL, av_clip_int16(lrint(*(const double *) pi *(1<< 15)))) CONV_FUNC(AV_SAMPLE_FMT_S32, int32_t, AV_SAMPLE_FMT_DBL, av_clipl_int32(llrint(*(const double *) pi *(1U<< 31)))) CONV_FUNC(AV_SAMPLE_FMT_S64, int64_t, AV_SAMPLE_FMT_DBL, llrint(*(const double *) pi *(INT64_C(1)<< 63))) #define FMT_PAIR_FUNC(out, in) static conv_func_type *const fmt_pair_to_conv_functions[AV_SAMPLE_FMT_NB *AV_SAMPLE_FMT_NB]={ FMT_PAIR_FUNC(AV_SAMPLE_FMT_U8, AV_SAMPLE_FMT_U8), FMT_PAIR_FUNC(AV_SAMPLE_FMT_S16, AV_SAMPLE_FMT_U8), FMT_PAIR_FUNC(AV_SAMPLE_FMT_S32, AV_SAMPLE_FMT_U8), FMT_PAIR_FUNC(AV_SAMPLE_FMT_FLT, AV_SAMPLE_FMT_U8), FMT_PAIR_FUNC(AV_SAMPLE_FMT_DBL, AV_SAMPLE_FMT_U8), FMT_PAIR_FUNC(AV_SAMPLE_FMT_S64, AV_SAMPLE_FMT_U8), FMT_PAIR_FUNC(AV_SAMPLE_FMT_U8, AV_SAMPLE_FMT_S16), FMT_PAIR_FUNC(AV_SAMPLE_FMT_S16, AV_SAMPLE_FMT_S16), FMT_PAIR_FUNC(AV_SAMPLE_FMT_S32, AV_SAMPLE_FMT_S16), FMT_PAIR_FUNC(AV_SAMPLE_FMT_FLT, AV_SAMPLE_FMT_S16), FMT_PAIR_FUNC(AV_SAMPLE_FMT_DBL, AV_SAMPLE_FMT_S16), FMT_PAIR_FUNC(AV_SAMPLE_FMT_S64, AV_SAMPLE_FMT_S16), FMT_PAIR_FUNC(AV_SAMPLE_FMT_U8, AV_SAMPLE_FMT_S32), FMT_PAIR_FUNC(AV_SAMPLE_FMT_S16, AV_SAMPLE_FMT_S32), FMT_PAIR_FUNC(AV_SAMPLE_FMT_S32, AV_SAMPLE_FMT_S32), FMT_PAIR_FUNC(AV_SAMPLE_FMT_FLT, AV_SAMPLE_FMT_S32), FMT_PAIR_FUNC(AV_SAMPLE_FMT_DBL, AV_SAMPLE_FMT_S32), FMT_PAIR_FUNC(AV_SAMPLE_FMT_S64, AV_SAMPLE_FMT_S32), FMT_PAIR_FUNC(AV_SAMPLE_FMT_U8, AV_SAMPLE_FMT_FLT), FMT_PAIR_FUNC(AV_SAMPLE_FMT_S16, AV_SAMPLE_FMT_FLT), FMT_PAIR_FUNC(AV_SAMPLE_FMT_S32, AV_SAMPLE_FMT_FLT), FMT_PAIR_FUNC(AV_SAMPLE_FMT_FLT, AV_SAMPLE_FMT_FLT), FMT_PAIR_FUNC(AV_SAMPLE_FMT_DBL, AV_SAMPLE_FMT_FLT), FMT_PAIR_FUNC(AV_SAMPLE_FMT_S64, AV_SAMPLE_FMT_FLT), FMT_PAIR_FUNC(AV_SAMPLE_FMT_U8, AV_SAMPLE_FMT_DBL), FMT_PAIR_FUNC(AV_SAMPLE_FMT_S16, AV_SAMPLE_FMT_DBL), FMT_PAIR_FUNC(AV_SAMPLE_FMT_S32, AV_SAMPLE_FMT_DBL), FMT_PAIR_FUNC(AV_SAMPLE_FMT_FLT, AV_SAMPLE_FMT_DBL), FMT_PAIR_FUNC(AV_SAMPLE_FMT_DBL, AV_SAMPLE_FMT_DBL), FMT_PAIR_FUNC(AV_SAMPLE_FMT_S64, AV_SAMPLE_FMT_DBL), FMT_PAIR_FUNC(AV_SAMPLE_FMT_U8, AV_SAMPLE_FMT_S64), FMT_PAIR_FUNC(AV_SAMPLE_FMT_S16, AV_SAMPLE_FMT_S64), FMT_PAIR_FUNC(AV_SAMPLE_FMT_S32, AV_SAMPLE_FMT_S64), FMT_PAIR_FUNC(AV_SAMPLE_FMT_FLT, AV_SAMPLE_FMT_S64), FMT_PAIR_FUNC(AV_SAMPLE_FMT_DBL, AV_SAMPLE_FMT_S64), FMT_PAIR_FUNC(AV_SAMPLE_FMT_S64, AV_SAMPLE_FMT_S64), };static void cpy1(uint8_t **dst, const uint8_t **src, int len){ memcpy(*dst, *src, len);} static void cpy2(uint8_t **dst, const uint8_t **src, int len){ memcpy(*dst, *src, 2 *len);} static void cpy4(uint8_t **dst, const uint8_t **src, int len){ memcpy(*dst, *src, 4 *len);} static void cpy8(uint8_t **dst, const uint8_t **src, int len){ memcpy(*dst, *src, 8 *len);} AudioConvert *swri_audio_convert_alloc(enum AVSampleFormat out_fmt, enum AVSampleFormat in_fmt, int channels, const int *ch_map, int flags) { AudioConvert *ctx;conv_func_type *f=fmt_pair_to_conv_functions[av_get_packed_sample_fmt(out_fmt)+AV_SAMPLE_FMT_NB *av_get_packed_sample_fmt(in_fmt)];if(!f) return NULL;ctx=av_mallocz(sizeof(*ctx));if(!ctx) return NULL;if(channels==1){ in_fmt=av_get_planar_sample_fmt(in_fmt);out_fmt=av_get_planar_sample_fmt(out_fmt);} ctx->channels=channels;ctx->conv_f=f;ctx->ch_map=ch_map;if(in_fmt==AV_SAMPLE_FMT_U8||in_fmt==AV_SAMPLE_FMT_U8P) memset(ctx->silence, 0x80, sizeof(ctx->silence));if(out_fmt==in_fmt &&!ch_map) { switch(av_get_bytes_per_sample(in_fmt)){ case 1:ctx->simd_f=cpy1;break;case 2:ctx->simd_f=cpy2;break;case 4:ctx->simd_f=cpy4;break;case 8:ctx->simd_f=cpy8;break;} } if(HAVE_X86ASM &&1) swri_audio_convert_init_x86(ctx, out_fmt, in_fmt, channels);if(ARCH_ARM) swri_audio_convert_init_arm(ctx, out_fmt, in_fmt, channels);if(ARCH_AARCH64) swri_audio_convert_init_aarch64(ctx, out_fmt, in_fmt, channels);return ctx;} void swri_audio_convert_free(AudioConvert **ctx) { av_freep(ctx);} int swri_audio_convert(AudioConvert *ctx, AudioData *out, AudioData *in, int len) { int ch;int off=0;const int os=(out->planar ? 1 :out->ch_count) *out->bps;unsigned misaligned=0;av_assert0(ctx->channels==out->ch_count);if(ctx->in_simd_align_mask) { int planes=in->planar ? in->ch_count :1;unsigned m=0;for(ch=0;ch< planes;ch++) m|=(intptr_t) in->ch[ch];misaligned|=m &ctx->in_simd_align_mask;} if(ctx->out_simd_align_mask) { int planes=out->planar ? out->ch_count :1;unsigned m=0;for(ch=0;ch< planes;ch++) m|=(intptr_t) out->ch[ch];misaligned|=m &ctx->out_simd_align_mask;} if(ctx->simd_f &&!ctx->ch_map &&!misaligned){ off=len &~15;av_assert1(off >=0);av_assert1(off<=len);av_assert2(ctx->channels==SWR_CH_MAX||!in->ch[ctx->channels]);if(off >0){ if(out->planar==in->planar){ int planes=out->planar ? out->ch_count :1;for(ch=0;ch< planes;ch++){ ctx->simd_f(out-> ch ch
Definition: audioconvert.c:56
output
filter_frame For filters that do not use the this method is called when a frame is pushed to the filter s input It can be called at any time except in a reentrant way If the input frame is enough to produce output
Definition: filter_design.txt:225
AC3DSPContext
Definition: ac3dsp.h:33
AC3_MAX_COEFS
#define AC3_MAX_COEFS
Definition: ac3.h:35
AC3_CRITICAL_BANDS
#define AC3_CRITICAL_BANDS
Definition: ac3.h:40
AVFixedDSPContext
Definition: fixed_dsp.h:56
channels
channels
Definition: aptx.c:30
ff_eac3_decode_transform_coeffs_aht_ch
static void ff_eac3_decode_transform_coeffs_aht_ch(AC3DecodeContext *s, int ch)
Definition: eac3dec.c:196
sample_rate
sample_rate
Definition: ffmpeg_filter.c:191
fmtconvert.h
window
static SDL_Window * window
Definition: ffplay.c:367
AC3_MAX_BLOCKS
#define AC3_MAX_BLOCKS
Definition: ac3.h:37
fixed_coeffs
static const int fixed_coeffs[][3]
Definition: shorten.c:343
GetBitContext
Definition: get_bits.h:61
AC3_MAX_CHANNELS
#define AC3_MAX_CHANNELS
maximum number of channels, including coupling channel
Definition: ac3.h:32
AC3_MAX_CPL_BANDS
#define AC3_MAX_CPL_BANDS
Definition: ac3.h:41
mask
static const uint16_t mask[17]
Definition: lzw.c:38
s
#define s(width, name)
Definition: cbs_vp9.c:257
frame_size
int frame_size
Definition: mxfenc.c:2215
lfg.h
get_bits.h
fixed_dsp.h
ff_ac3_heavy_dynamic_range_tab
float ff_ac3_heavy_dynamic_range_tab[256]
Definition: ac3dec.c:69
SHORTFLOAT
float SHORTFLOAT
Definition: aac_defines.h:89
AVClass
Describe the class of an AVClass context structure.
Definition: log.h:67
ac3dsp.h
float_dsp.h
AVLFG
Context structure for the Lagged Fibonacci PRNG.
Definition: lfg.h:33
AVFloatDSPContext
Definition: float_dsp.h:24
EAC3_MAX_CHANNELS
#define EAC3_MAX_CHANNELS
maximum number of channels in EAC3
Definition: ac3.h:31
DECLARE_ALIGNED
#define DECLARE_ALIGNED(n, t, v)
Definition: mem.h:112
FFTContext
Definition: fft.h:88
ff_eac3_apply_spectral_extension
static void ff_eac3_apply_spectral_extension(AC3DecodeContext *s)
Definition: eac3dec.c:59
uint8_t
uint8_t
Definition: audio_convert.c:194
AV_INPUT_BUFFER_PADDING_SIZE
#define AV_INPUT_BUFFER_PADDING_SIZE
Definition: avcodec.h:790
AC3BitAllocParameters
Definition: ac3.h:166
AVCodecContext
main external API structure.
Definition: avcodec.h:1565
FmtConvertContext
Definition: fmtconvert.h:28
ac3.h
BswapDSPContext
Definition: bswapdsp.h:24
INTFLOAT
float INTFLOAT
Definition: aac_defines.h:86
AC3_BLOCK_SIZE
#define AC3_BLOCK_SIZE
Definition: ac3.h:36
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