2 * AC-3 encoder & E-AC-3 encoder common header
3 * Copyright (c) 2000 Fabrice Bellard
4 * Copyright (c) 2006-2010 Justin Ruggles <justin.ruggles@gmail.com>
6 * This file is part of FFmpeg.
8 * FFmpeg is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Lesser General Public
10 * License as published by the Free Software Foundation; either
11 * version 2.1 of the License, or (at your option) any later version.
13 * FFmpeg is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Lesser General Public License for more details.
18 * You should have received a copy of the GNU Lesser General Public
19 * License along with FFmpeg; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
25 * AC-3 encoder & E-AC-3 encoder common header
28 #ifndef AVCODEC_AC3ENC_H
29 #define AVCODEC_AC3ENC_H
43 #define AC3ENC_FLOAT 0
47 #include "libavutil/float_dsp.h"
48 #define AC3_NAME(x) ff_ac3_float_ ## x
49 #define MAC_COEF(d,a,b) ((d)+=(a)*(b))
50 #define COEF_MIN (-16777215.0/16777216.0)
51 #define COEF_MAX ( 16777215.0/16777216.0)
52 #define NEW_CPL_COORD_THRESHOLD 0.03
53 typedef float SampleType;
54 typedef float CoefType;
55 typedef float CoefSumType;
57 #include "libavutil/fixed_dsp.h"
58 #define AC3_NAME(x) ff_ac3_fixed_ ## x
59 #define MAC_COEF(d,a,b) MAC64(d,a,b)
60 #define COEF_MIN -16777215
61 #define COEF_MAX 16777215
62 #define NEW_CPL_COORD_THRESHOLD 503317
63 typedef int32_t SampleType;
64 typedef int32_t CoefType;
65 typedef int64_t CoefSumType;
68 /* common option values */
69 #define AC3ENC_OPT_NONE -1
70 #define AC3ENC_OPT_AUTO -1
71 #define AC3ENC_OPT_OFF 0
72 #define AC3ENC_OPT_ON 1
73 #define AC3ENC_OPT_NOT_INDICATED 0
74 #define AC3ENC_OPT_MODE_ON 2
75 #define AC3ENC_OPT_MODE_OFF 1
76 #define AC3ENC_OPT_DSUREX_DPLIIZ 3
78 /* specific option values */
79 #define AC3ENC_OPT_LARGE_ROOM 1
80 #define AC3ENC_OPT_SMALL_ROOM 2
81 #define AC3ENC_OPT_DOWNMIX_LTRT 1
82 #define AC3ENC_OPT_DOWNMIX_LORO 2
83 #define AC3ENC_OPT_DOWNMIX_DPLII 3 // reserved value in A/52, but used by encoders to indicate DPL2
84 #define AC3ENC_OPT_ADCONV_STANDARD 0
85 #define AC3ENC_OPT_ADCONV_HDCD 1
89 * Encoding Options used by AVOption.
91 typedef struct AC3EncOptions {
92 /* AC-3 metadata options*/
95 float center_mix_level;
96 float surround_mix_level;
97 int dolby_surround_mode;
98 int audio_production_info;
104 int preferred_stereo_downmix;
105 float ltrt_center_mix_level;
106 float ltrt_surround_mix_level;
107 float loro_center_mix_level;
108 float loro_surround_mix_level;
110 int dolby_surround_ex_mode;
111 int dolby_headphone_mode;
112 int ad_converter_type;
113 int eac3_mixing_metadata;
114 int eac3_info_metadata;
116 /* other encoding options */
117 int allow_per_frame_metadata;
118 int stereo_rematrixing;
119 int channel_coupling;
124 * Data for a single audio block.
126 typedef struct AC3Block {
127 CoefType **mdct_coef; ///< MDCT coefficients
128 int32_t **fixed_coef; ///< fixed-point MDCT coefficients
129 uint8_t **exp; ///< original exponents
130 uint8_t **grouped_exp; ///< grouped exponents
131 int16_t **psd; ///< psd per frequency bin
132 int16_t **band_psd; ///< psd per critical band
133 int16_t **mask; ///< masking curve
134 uint16_t **qmant; ///< quantized mantissas
135 uint8_t **cpl_coord_exp; ///< coupling coord exponents (cplcoexp)
136 uint8_t **cpl_coord_mant; ///< coupling coord mantissas (cplcomant)
137 uint8_t new_rematrixing_strategy; ///< send new rematrixing flags in this block
138 int num_rematrixing_bands; ///< number of rematrixing bands
139 uint8_t rematrixing_flags[4]; ///< rematrixing flags
140 int new_cpl_strategy; ///< send new coupling strategy
141 int cpl_in_use; ///< coupling in use for this block (cplinu)
142 uint8_t channel_in_cpl[AC3_MAX_CHANNELS]; ///< channel in coupling (chincpl)
143 int num_cpl_channels; ///< number of channels in coupling
144 uint8_t new_cpl_coords[AC3_MAX_CHANNELS]; ///< send new coupling coordinates (cplcoe)
145 uint8_t cpl_master_exp[AC3_MAX_CHANNELS]; ///< coupling coord master exponents (mstrcplco)
146 int new_snr_offsets; ///< send new SNR offsets
147 int new_cpl_leak; ///< send new coupling leak info
148 int end_freq[AC3_MAX_CHANNELS]; ///< end frequency bin (endmant)
152 * AC-3 encoder private context.
154 typedef struct AC3EncodeContext {
155 AVClass *av_class; ///< AVClass used for AVOption
156 AC3EncOptions options; ///< encoding options
157 AVCodecContext *avctx; ///< parent AVCodecContext
158 PutBitContext pb; ///< bitstream writer context
159 AudioDSPContext adsp;
161 AVFloatDSPContext *fdsp;
163 AVFixedDSPContext *fdsp;
166 AC3DSPContext ac3dsp; ///< AC-3 optimized functions
167 FFTContext mdct; ///< FFT context for MDCT calculation
168 const SampleType *mdct_window; ///< MDCT window function array
170 AC3Block blocks[AC3_MAX_BLOCKS]; ///< per-block info
172 int fixed_point; ///< indicates if fixed-point encoder is being used
173 int eac3; ///< indicates if this is E-AC-3 vs. AC-3
174 int bitstream_id; ///< bitstream id (bsid)
175 int bitstream_mode; ///< bitstream mode (bsmod)
177 int bit_rate; ///< target bit rate, in bits-per-second
178 int sample_rate; ///< sampling frequency, in Hz
180 int num_blks_code; ///< number of blocks code (numblkscod)
181 int num_blocks; ///< number of blocks per frame
182 int frame_size_min; ///< minimum frame size in case rounding is necessary
183 int frame_size; ///< current frame size in bytes
184 int frame_size_code; ///< frame size code (frmsizecod)
186 int64_t bits_written; ///< bit count (used to avg. bitrate)
187 int64_t samples_written; ///< sample count (used to avg. bitrate)
189 int fbw_channels; ///< number of full-bandwidth channels (nfchans)
190 int channels; ///< total number of channels (nchans)
191 int lfe_on; ///< indicates if there is an LFE channel (lfeon)
192 int lfe_channel; ///< channel index of the LFE channel
193 int has_center; ///< indicates if there is a center channel
194 int has_surround; ///< indicates if there are one or more surround channels
195 int channel_mode; ///< channel mode (acmod)
196 const uint8_t *channel_map; ///< channel map used to reorder channels
198 int center_mix_level; ///< center mix level code
199 int surround_mix_level; ///< surround mix level code
200 int ltrt_center_mix_level; ///< Lt/Rt center mix level code
201 int ltrt_surround_mix_level; ///< Lt/Rt surround mix level code
202 int loro_center_mix_level; ///< Lo/Ro center mix level code
203 int loro_surround_mix_level; ///< Lo/Ro surround mix level code
205 int cutoff; ///< user-specified cutoff frequency, in Hz
206 int bandwidth_code; ///< bandwidth code (0 to 60) (chbwcod)
207 int start_freq[AC3_MAX_CHANNELS]; ///< start frequency bin (strtmant)
208 int cpl_end_freq; ///< coupling channel end frequency bin
210 int cpl_on; ///< coupling turned on for this frame
211 int cpl_enabled; ///< coupling enabled for all frames
212 int num_cpl_subbands; ///< number of coupling subbands (ncplsubnd)
213 int num_cpl_bands; ///< number of coupling bands (ncplbnd)
214 uint8_t cpl_band_sizes[AC3_MAX_CPL_BANDS]; ///< number of coeffs in each coupling band
216 int rematrixing_enabled; ///< stereo rematrixing enabled
218 /* bitrate allocation control */
219 int slow_gain_code; ///< slow gain code (sgaincod)
220 int slow_decay_code; ///< slow decay code (sdcycod)
221 int fast_decay_code; ///< fast decay code (fdcycod)
222 int db_per_bit_code; ///< dB/bit code (dbpbcod)
223 int floor_code; ///< floor code (floorcod)
224 AC3BitAllocParameters bit_alloc; ///< bit allocation parameters
225 int coarse_snr_offset; ///< coarse SNR offsets (csnroffst)
226 int fast_gain_code[AC3_MAX_CHANNELS]; ///< fast gain codes (signal-to-mask ratio) (fgaincod)
227 int fine_snr_offset[AC3_MAX_CHANNELS]; ///< fine SNR offsets (fsnroffst)
228 int frame_bits_fixed; ///< number of non-coefficient bits for fixed parameters
229 int frame_bits; ///< all frame bits except exponents and mantissas
230 int exponent_bits; ///< number of bits used for exponents
232 SampleType *windowed_samples;
233 SampleType **planar_samples;
235 uint8_t *bap1_buffer;
236 CoefType *mdct_coef_buffer;
237 int32_t *fixed_coef_buffer;
239 uint8_t *grouped_exp_buffer;
241 int16_t *band_psd_buffer;
242 int16_t *mask_buffer;
243 int16_t *qmant_buffer;
244 uint8_t *cpl_coord_exp_buffer;
245 uint8_t *cpl_coord_mant_buffer;
247 uint8_t exp_strategy[AC3_MAX_CHANNELS][AC3_MAX_BLOCKS]; ///< exponent strategies
248 uint8_t frame_exp_strategy[AC3_MAX_CHANNELS]; ///< frame exp strategy index
249 int use_frame_exp_strategy; ///< indicates use of frame exp strategy
250 uint8_t exp_ref_block[AC3_MAX_CHANNELS][AC3_MAX_BLOCKS]; ///< reference blocks for EXP_REUSE
251 uint8_t *ref_bap [AC3_MAX_CHANNELS][AC3_MAX_BLOCKS]; ///< bit allocation pointers (bap)
252 int ref_bap_set; ///< indicates if ref_bap pointers have been set
254 int warned_alternate_bitstream;
256 /* fixed vs. float function pointers */
257 void (*mdct_end)(struct AC3EncodeContext *s);
258 int (*mdct_init)(struct AC3EncodeContext *s);
260 /* fixed vs. float templated function pointers */
261 int (*allocate_sample_buffers)(struct AC3EncodeContext *s);
263 /* AC-3 vs. E-AC-3 function pointers */
264 void (*output_frame_header)(struct AC3EncodeContext *s);
268 extern const uint64_t ff_ac3_channel_layouts[19];
269 extern const AVOption ff_ac3_enc_options[];
270 extern const AVCodecDefault ff_ac3_enc_defaults[];
272 int ff_ac3_encode_init(AVCodecContext *avctx);
273 int ff_ac3_float_encode_init(AVCodecContext *avctx);
275 int ff_ac3_encode_close(AVCodecContext *avctx);
277 int ff_ac3_validate_metadata(AC3EncodeContext *s);
279 void ff_ac3_adjust_frame_size(AC3EncodeContext *s);
281 void ff_ac3_compute_coupling_strategy(AC3EncodeContext *s);
283 int ff_ac3_encode_frame_common_end(AVCodecContext *avctx, AVPacket *avpkt,
284 const AVFrame *frame, int *got_packet_ptr);
286 /* prototypes for functions in ac3enc_template.c */
288 int ff_ac3_fixed_encode_frame(AVCodecContext *avctx, AVPacket *avpkt,
289 const AVFrame *frame, int *got_packet_ptr);
290 int ff_ac3_float_encode_frame(AVCodecContext *avctx, AVPacket *avpkt,
291 const AVFrame *frame, int *got_packet_ptr);
293 #endif /* AVCODEC_AC3ENC_H */