diff options
-rw-r--r-- | libavcodec/Makefile | 3 | ||||
-rw-r--r-- | libavcodec/ac3enc.c | 284 | ||||
-rw-r--r-- | libavcodec/ac3enc.h | 214 | ||||
-rw-r--r-- | libavcodec/eac3enc.c | 131 | ||||
-rw-r--r-- | libavcodec/eac3enc.h | 44 |
5 files changed, 396 insertions, 280 deletions
diff --git a/libavcodec/Makefile b/libavcodec/Makefile index b772bf1..7fd6b49 100644 --- a/libavcodec/Makefile +++ b/libavcodec/Makefile @@ -124,7 +124,8 @@ OBJS-$(CONFIG_DVVIDEO_DECODER) += dv.o dvdata.o OBJS-$(CONFIG_DVVIDEO_ENCODER) += dv.o dvdata.o OBJS-$(CONFIG_DXA_DECODER) += dxa.o OBJS-$(CONFIG_EAC3_DECODER) += eac3dec.o eac3dec_data.o -OBJS-$(CONFIG_EAC3_ENCODER) += ac3enc_float.o ac3tab.o ac3.o kbdwin.o +OBJS-$(CONFIG_EAC3_ENCODER) += eac3enc.o ac3enc_float.o ac3tab.o \ + ac3.o kbdwin.o OBJS-$(CONFIG_EACMV_DECODER) += eacmv.o OBJS-$(CONFIG_EAMAD_DECODER) += eamad.o eaidct.o mpeg12.o \ mpeg12data.o mpegvideo.o \ diff --git a/libavcodec/ac3enc.c b/libavcodec/ac3enc.c index 1ab0c62..9e011af 100644 --- a/libavcodec/ac3enc.c +++ b/libavcodec/ac3enc.c @@ -42,183 +42,8 @@ #include "ac3.h" #include "audioconvert.h" #include "fft.h" - - -#ifndef CONFIG_AC3ENC_FLOAT -#define CONFIG_AC3ENC_FLOAT 0 -#endif - - -#if CONFIG_AC3ENC_FLOAT -#define MAC_COEF(d,a,b) ((d)+=(a)*(b)) -typedef float SampleType; -typedef float CoefType; -typedef float CoefSumType; -#else -#define MAC_COEF(d,a,b) MAC64(d,a,b) -typedef int16_t SampleType; -typedef int32_t CoefType; -typedef int64_t CoefSumType; -#endif - -typedef struct AC3MDCTContext { - const SampleType *window; ///< MDCT window function - FFTContext fft; ///< FFT context for MDCT calculation -} AC3MDCTContext; - -/** - * Encoding Options used by AVOption. - */ -typedef struct AC3EncOptions { - /* AC-3 metadata options*/ - int dialogue_level; - int bitstream_mode; - float center_mix_level; - float surround_mix_level; - int dolby_surround_mode; - int audio_production_info; - int mixing_level; - int room_type; - int copyright; - int original; - int extended_bsi_1; - int preferred_stereo_downmix; - float ltrt_center_mix_level; - float ltrt_surround_mix_level; - float loro_center_mix_level; - float loro_surround_mix_level; - int extended_bsi_2; - int dolby_surround_ex_mode; - int dolby_headphone_mode; - int ad_converter_type; - - /* other encoding options */ - int allow_per_frame_metadata; - int stereo_rematrixing; - int channel_coupling; - int cpl_start; -} AC3EncOptions; - -/** - * Data for a single audio block. - */ -typedef struct AC3Block { - CoefType **mdct_coef; ///< MDCT coefficients - int32_t **fixed_coef; ///< fixed-point MDCT coefficients - uint8_t **exp; ///< original exponents - uint8_t **grouped_exp; ///< grouped exponents - int16_t **psd; ///< psd per frequency bin - int16_t **band_psd; ///< psd per critical band - int16_t **mask; ///< masking curve - uint16_t **qmant; ///< quantized mantissas - uint8_t **cpl_coord_exp; ///< coupling coord exponents (cplcoexp) - uint8_t **cpl_coord_mant; ///< coupling coord mantissas (cplcomant) - uint8_t coeff_shift[AC3_MAX_CHANNELS]; ///< fixed-point coefficient shift values - uint8_t new_rematrixing_strategy; ///< send new rematrixing flags in this block - int num_rematrixing_bands; ///< number of rematrixing bands - uint8_t rematrixing_flags[4]; ///< rematrixing flags - int new_cpl_strategy; ///< send new coupling strategy - int cpl_in_use; ///< coupling in use for this block (cplinu) - uint8_t channel_in_cpl[AC3_MAX_CHANNELS]; ///< channel in coupling (chincpl) - int num_cpl_channels; ///< number of channels in coupling - uint8_t new_cpl_coords; ///< send new coupling coordinates (cplcoe) - uint8_t cpl_master_exp[AC3_MAX_CHANNELS]; ///< coupling coord master exponents (mstrcplco) - int new_snr_offsets; ///< send new SNR offsets - int new_cpl_leak; ///< send new coupling leak info - int end_freq[AC3_MAX_CHANNELS]; ///< end frequency bin (endmant) -} AC3Block; - -/** - * AC-3 encoder private context. - */ -typedef struct AC3EncodeContext { - AVClass *av_class; ///< AVClass used for AVOption - AC3EncOptions options; ///< encoding options - PutBitContext pb; ///< bitstream writer context - DSPContext dsp; - AC3DSPContext ac3dsp; ///< AC-3 optimized functions - AC3MDCTContext mdct; ///< MDCT context - - AC3Block blocks[AC3_MAX_BLOCKS]; ///< per-block info - - int eac3; ///< indicates if this is E-AC-3 vs. AC-3 - int bitstream_id; ///< bitstream id (bsid) - int bitstream_mode; ///< bitstream mode (bsmod) - - int bit_rate; ///< target bit rate, in bits-per-second - int sample_rate; ///< sampling frequency, in Hz - - int frame_size_min; ///< minimum frame size in case rounding is necessary - int frame_size; ///< current frame size in bytes - int frame_size_code; ///< frame size code (frmsizecod) - uint16_t crc_inv[2]; - int64_t bits_written; ///< bit count (used to avg. bitrate) - int64_t samples_written; ///< sample count (used to avg. bitrate) - - int fbw_channels; ///< number of full-bandwidth channels (nfchans) - int channels; ///< total number of channels (nchans) - int lfe_on; ///< indicates if there is an LFE channel (lfeon) - int lfe_channel; ///< channel index of the LFE channel - int has_center; ///< indicates if there is a center channel - int has_surround; ///< indicates if there are one or more surround channels - int channel_mode; ///< channel mode (acmod) - const uint8_t *channel_map; ///< channel map used to reorder channels - - int center_mix_level; ///< center mix level code - int surround_mix_level; ///< surround mix level code - int ltrt_center_mix_level; ///< Lt/Rt center mix level code - int ltrt_surround_mix_level; ///< Lt/Rt surround mix level code - int loro_center_mix_level; ///< Lo/Ro center mix level code - int loro_surround_mix_level; ///< Lo/Ro surround mix level code - - int cutoff; ///< user-specified cutoff frequency, in Hz - int bandwidth_code; ///< bandwidth code (0 to 60) (chbwcod) - int start_freq[AC3_MAX_CHANNELS]; ///< start frequency bin (strtmant) - int cpl_end_freq; ///< coupling channel end frequency bin - - int cpl_on; ///< coupling turned on for this frame - int cpl_enabled; ///< coupling enabled for all frames - int num_cpl_subbands; ///< number of coupling subbands (ncplsubnd) - int num_cpl_bands; ///< number of coupling bands (ncplbnd) - uint8_t cpl_band_sizes[AC3_MAX_CPL_BANDS]; ///< number of coeffs in each coupling band - - int rematrixing_enabled; ///< stereo rematrixing enabled - - /* bitrate allocation control */ - int slow_gain_code; ///< slow gain code (sgaincod) - int slow_decay_code; ///< slow decay code (sdcycod) - int fast_decay_code; ///< fast decay code (fdcycod) - int db_per_bit_code; ///< dB/bit code (dbpbcod) - int floor_code; ///< floor code (floorcod) - AC3BitAllocParameters bit_alloc; ///< bit allocation parameters - int coarse_snr_offset; ///< coarse SNR offsets (csnroffst) - int fast_gain_code[AC3_MAX_CHANNELS]; ///< fast gain codes (signal-to-mask ratio) (fgaincod) - int fine_snr_offset[AC3_MAX_CHANNELS]; ///< fine SNR offsets (fsnroffst) - int frame_bits_fixed; ///< number of non-coefficient bits for fixed parameters - int frame_bits; ///< all frame bits except exponents and mantissas - int exponent_bits; ///< number of bits used for exponents - - SampleType **planar_samples; - uint8_t *bap_buffer; - uint8_t *bap1_buffer; - CoefType *mdct_coef_buffer; - int32_t *fixed_coef_buffer; - uint8_t *exp_buffer; - uint8_t *grouped_exp_buffer; - int16_t *psd_buffer; - int16_t *band_psd_buffer; - int16_t *mask_buffer; - uint16_t *qmant_buffer; - uint8_t *cpl_coord_exp_buffer; - uint8_t *cpl_coord_mant_buffer; - - uint8_t exp_strategy[AC3_MAX_CHANNELS][AC3_MAX_BLOCKS]; ///< exponent strategies - uint8_t exp_ref_block[AC3_MAX_CHANNELS][AC3_MAX_BLOCKS]; ///< reference blocks for EXP_REUSE - uint8_t *ref_bap [AC3_MAX_CHANNELS][AC3_MAX_BLOCKS]; ///< bit allocation pointers (bap) - int ref_bap_set; ///< indicates if ref_bap pointers have been set - - DECLARE_ALIGNED(32, SampleType, windowed_samples)[AC3_WINDOW_SIZE]; -} AC3EncodeContext; +#include "ac3enc.h" +#include "eac3enc.h" typedef struct AC3Mant { uint16_t *qmant1_ptr, *qmant2_ptr, *qmant4_ptr; ///< mantissa pointers for bap=1,2,4 @@ -741,34 +566,8 @@ static void apply_channel_coupling(AC3EncodeContext *s) } } - if (s->eac3) { - /* set first cpl coords */ - int first_cpl_coords[AC3_MAX_CHANNELS]; - for (ch = 1; ch <= s->fbw_channels; ch++) - first_cpl_coords[ch] = 1; - for (blk = 0; blk < AC3_MAX_BLOCKS; blk++) { - AC3Block *block = &s->blocks[blk]; - for (ch = 1; ch <= s->fbw_channels; ch++) { - if (block->channel_in_cpl[ch]) { - if (first_cpl_coords[ch]) { - block->new_cpl_coords = 2; - first_cpl_coords[ch] = 0; - } - } else { - first_cpl_coords[ch] = 1; - } - } - } - - /* set first cpl leak */ - for (blk = 0; blk < AC3_MAX_BLOCKS; blk++) { - AC3Block *block = &s->blocks[blk]; - if (block->cpl_in_use) { - block->new_cpl_leak = 2; - break; - } - } - } + if (s->eac3) + ff_eac3_set_cpl_states(s); #endif /* CONFIG_AC3ENC_FLOAT */ } @@ -1906,79 +1705,6 @@ static void ac3_output_frame_header(AC3EncodeContext *s) /** - * Write the E-AC-3 frame header to the output bitstream. - */ -static void eac3_output_frame_header(AC3EncodeContext *s) -{ - int blk, ch; - AC3EncOptions *opt = &s->options; - - put_bits(&s->pb, 16, 0x0b77); /* sync word */ - - /* BSI header */ - put_bits(&s->pb, 2, 0); /* stream type = independent */ - put_bits(&s->pb, 3, 0); /* substream id = 0 */ - put_bits(&s->pb, 11, (s->frame_size / 2) - 1); /* frame size */ - if (s->bit_alloc.sr_shift) { - put_bits(&s->pb, 2, 0x3); /* fscod2 */ - put_bits(&s->pb, 2, s->bit_alloc.sr_code); /* sample rate code */ - } else { - put_bits(&s->pb, 2, s->bit_alloc.sr_code); /* sample rate code */ - put_bits(&s->pb, 2, 0x3); /* number of blocks = 6 */ - } - put_bits(&s->pb, 3, s->channel_mode); /* audio coding mode */ - put_bits(&s->pb, 1, s->lfe_on); /* LFE channel indicator */ - put_bits(&s->pb, 5, s->bitstream_id); /* bitstream id (EAC3=16) */ - put_bits(&s->pb, 5, -opt->dialogue_level); /* dialogue normalization level */ - put_bits(&s->pb, 1, 0); /* no compression gain */ - put_bits(&s->pb, 1, 0); /* no mixing metadata */ - /* TODO: mixing metadata */ - put_bits(&s->pb, 1, 0); /* no info metadata */ - /* TODO: info metadata */ - put_bits(&s->pb, 1, 0); /* no additional bit stream info */ - - /* frame header */ - put_bits(&s->pb, 1, 1); /* exponent strategy syntax = each block */ - put_bits(&s->pb, 1, 0); /* aht enabled = no */ - put_bits(&s->pb, 2, 0); /* snr offset strategy = 1 */ - put_bits(&s->pb, 1, 0); /* transient pre-noise processing enabled = no */ - put_bits(&s->pb, 1, 0); /* block switch syntax enabled = no */ - put_bits(&s->pb, 1, 0); /* dither flag syntax enabled = no */ - put_bits(&s->pb, 1, 0); /* bit allocation model syntax enabled = no */ - put_bits(&s->pb, 1, 0); /* fast gain codes enabled = no */ - put_bits(&s->pb, 1, 0); /* dba syntax enabled = no */ - put_bits(&s->pb, 1, 0); /* skip field syntax enabled = no */ - put_bits(&s->pb, 1, 0); /* spx enabled = no */ - /* coupling strategy use flags */ - if (s->channel_mode > AC3_CHMODE_MONO) { - put_bits(&s->pb, 1, s->blocks[0].cpl_in_use); - for (blk = 1; blk < AC3_MAX_BLOCKS; blk++) { - AC3Block *block = &s->blocks[blk]; - put_bits(&s->pb, 1, block->new_cpl_strategy); - if (block->new_cpl_strategy) - put_bits(&s->pb, 1, block->cpl_in_use); - } - } - /* exponent strategy */ - for (blk = 0; blk < AC3_MAX_BLOCKS; blk++) - for (ch = !s->blocks[blk].cpl_in_use; ch <= s->fbw_channels; ch++) - put_bits(&s->pb, 2, s->exp_strategy[ch][blk]); - if (s->lfe_on) { - for (blk = 0; blk < AC3_MAX_BLOCKS; blk++) - put_bits(&s->pb, 1, s->exp_strategy[s->lfe_channel][blk]); - } - /* E-AC-3 to AC-3 converter exponent strategy (unfortunately not optional...) */ - for (ch = 1; ch <= s->fbw_channels; ch++) - put_bits(&s->pb, 5, 0); - /* snr offsets */ - put_bits(&s->pb, 6, s->coarse_snr_offset); - put_bits(&s->pb, 4, s->fine_snr_offset[1]); - /* block start info */ - put_bits(&s->pb, 1, 0); -} - - -/** * Write one audio block to the output bitstream. */ static void output_audio_block(AC3EncodeContext *s, int blk) @@ -2262,7 +1988,7 @@ static void output_frame(AC3EncodeContext *s, unsigned char *frame) init_put_bits(&s->pb, frame, AC3_MAX_CODED_FRAME_SIZE); if (s->eac3) - eac3_output_frame_header(s); + ff_eac3_output_frame_header(s); else ac3_output_frame_header(s); diff --git a/libavcodec/ac3enc.h b/libavcodec/ac3enc.h new file mode 100644 index 0000000..0541683 --- /dev/null +++ b/libavcodec/ac3enc.h @@ -0,0 +1,214 @@ +/* + * AC-3 encoder & E-AC-3 encoder common header + * Copyright (c) 2000 Fabrice Bellard + * Copyright (c) 2006-2010 Justin Ruggles <justin.ruggles@gmail.com> + * + * This file is part of Libav. + * + * Libav is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2.1 of the License, or (at your option) any later version. + * + * Libav is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with Libav; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + */ + +/** + * @file + * AC-3 encoder & E-AC-3 encoder common header + */ + +#ifndef AVCODEC_AC3ENC_H +#define AVCODEC_AC3ENC_H + +#include <stdint.h> +#include "ac3.h" +#include "ac3dsp.h" +#include "avcodec.h" +#include "dsputil.h" +#include "put_bits.h" +#include "fft.h" + +#ifndef CONFIG_AC3ENC_FLOAT +#define CONFIG_AC3ENC_FLOAT 0 +#endif + +#if CONFIG_AC3ENC_FLOAT +#define MAC_COEF(d,a,b) ((d)+=(a)*(b)) +typedef float SampleType; +typedef float CoefType; +typedef float CoefSumType; +#else +#define MAC_COEF(d,a,b) MAC64(d,a,b) +typedef int16_t SampleType; +typedef int32_t CoefType; +typedef int64_t CoefSumType; +#endif + +typedef struct AC3MDCTContext { + const SampleType *window; ///< MDCT window function + FFTContext fft; ///< FFT context for MDCT calculation +} AC3MDCTContext; + +/** + * Encoding Options used by AVOption. + */ +typedef struct AC3EncOptions { + /* AC-3 metadata options*/ + int dialogue_level; + int bitstream_mode; + float center_mix_level; + float surround_mix_level; + int dolby_surround_mode; + int audio_production_info; + int mixing_level; + int room_type; + int copyright; + int original; + int extended_bsi_1; + int preferred_stereo_downmix; + float ltrt_center_mix_level; + float ltrt_surround_mix_level; + float loro_center_mix_level; + float loro_surround_mix_level; + int extended_bsi_2; + int dolby_surround_ex_mode; + int dolby_headphone_mode; + int ad_converter_type; + + /* other encoding options */ + int allow_per_frame_metadata; + int stereo_rematrixing; + int channel_coupling; + int cpl_start; +} AC3EncOptions; + +/** + * Data for a single audio block. + */ +typedef struct AC3Block { + CoefType **mdct_coef; ///< MDCT coefficients + int32_t **fixed_coef; ///< fixed-point MDCT coefficients + uint8_t **exp; ///< original exponents + uint8_t **grouped_exp; ///< grouped exponents + int16_t **psd; ///< psd per frequency bin + int16_t **band_psd; ///< psd per critical band + int16_t **mask; ///< masking curve + uint16_t **qmant; ///< quantized mantissas + uint8_t **cpl_coord_exp; ///< coupling coord exponents (cplcoexp) + uint8_t **cpl_coord_mant; ///< coupling coord mantissas (cplcomant) + uint8_t coeff_shift[AC3_MAX_CHANNELS]; ///< fixed-point coefficient shift values + uint8_t new_rematrixing_strategy; ///< send new rematrixing flags in this block + int num_rematrixing_bands; ///< number of rematrixing bands + uint8_t rematrixing_flags[4]; ///< rematrixing flags + int new_cpl_strategy; ///< send new coupling strategy + int cpl_in_use; ///< coupling in use for this block (cplinu) + uint8_t channel_in_cpl[AC3_MAX_CHANNELS]; ///< channel in coupling (chincpl) + int num_cpl_channels; ///< number of channels in coupling + uint8_t new_cpl_coords; ///< send new coupling coordinates (cplcoe) + uint8_t cpl_master_exp[AC3_MAX_CHANNELS]; ///< coupling coord master exponents (mstrcplco) + int new_snr_offsets; ///< send new SNR offsets + int new_cpl_leak; ///< send new coupling leak info + int end_freq[AC3_MAX_CHANNELS]; ///< end frequency bin (endmant) +} AC3Block; + +/** + * AC-3 encoder private context. + */ +typedef struct AC3EncodeContext { + AVClass *av_class; ///< AVClass used for AVOption + AC3EncOptions options; ///< encoding options + PutBitContext pb; ///< bitstream writer context + DSPContext dsp; + AC3DSPContext ac3dsp; ///< AC-3 optimized functions + AC3MDCTContext mdct; ///< MDCT context + + AC3Block blocks[AC3_MAX_BLOCKS]; ///< per-block info + + int eac3; ///< indicates if this is E-AC-3 vs. AC-3 + int bitstream_id; ///< bitstream id (bsid) + int bitstream_mode; ///< bitstream mode (bsmod) + + int bit_rate; ///< target bit rate, in bits-per-second + int sample_rate; ///< sampling frequency, in Hz + + int frame_size_min; ///< minimum frame size in case rounding is necessary + int frame_size; ///< current frame size in bytes + int frame_size_code; ///< frame size code (frmsizecod) + uint16_t crc_inv[2]; + int64_t bits_written; ///< bit count (used to avg. bitrate) + int64_t samples_written; ///< sample count (used to avg. bitrate) + + int fbw_channels; ///< number of full-bandwidth channels (nfchans) + int channels; ///< total number of channels (nchans) + int lfe_on; ///< indicates if there is an LFE channel (lfeon) + int lfe_channel; ///< channel index of the LFE channel + int has_center; ///< indicates if there is a center channel + int has_surround; ///< indicates if there are one or more surround channels + int channel_mode; ///< channel mode (acmod) + const uint8_t *channel_map; ///< channel map used to reorder channels + + int center_mix_level; ///< center mix level code + int surround_mix_level; ///< surround mix level code + int ltrt_center_mix_level; ///< Lt/Rt center mix level code + int ltrt_surround_mix_level; ///< Lt/Rt surround mix level code + int loro_center_mix_level; ///< Lo/Ro center mix level code + int loro_surround_mix_level; ///< Lo/Ro surround mix level code + + int cutoff; ///< user-specified cutoff frequency, in Hz + int bandwidth_code; ///< bandwidth code (0 to 60) (chbwcod) + int start_freq[AC3_MAX_CHANNELS]; ///< start frequency bin (strtmant) + int cpl_end_freq; ///< coupling channel end frequency bin + + int cpl_on; ///< coupling turned on for this frame + int cpl_enabled; ///< coupling enabled for all frames + int num_cpl_subbands; ///< number of coupling subbands (ncplsubnd) + int num_cpl_bands; ///< number of coupling bands (ncplbnd) + uint8_t cpl_band_sizes[AC3_MAX_CPL_BANDS]; ///< number of coeffs in each coupling band + + int rematrixing_enabled; ///< stereo rematrixing enabled + + /* bitrate allocation control */ + int slow_gain_code; ///< slow gain code (sgaincod) + int slow_decay_code; ///< slow decay code (sdcycod) + int fast_decay_code; ///< fast decay code (fdcycod) + int db_per_bit_code; ///< dB/bit code (dbpbcod) + int floor_code; ///< floor code (floorcod) + AC3BitAllocParameters bit_alloc; ///< bit allocation parameters + int coarse_snr_offset; ///< coarse SNR offsets (csnroffst) + int fast_gain_code[AC3_MAX_CHANNELS]; ///< fast gain codes (signal-to-mask ratio) (fgaincod) + int fine_snr_offset[AC3_MAX_CHANNELS]; ///< fine SNR offsets (fsnroffst) + int frame_bits_fixed; ///< number of non-coefficient bits for fixed parameters + int frame_bits; ///< all frame bits except exponents and mantissas + int exponent_bits; ///< number of bits used for exponents + + SampleType **planar_samples; + uint8_t *bap_buffer; + uint8_t *bap1_buffer; + CoefType *mdct_coef_buffer; + int32_t *fixed_coef_buffer; + uint8_t *exp_buffer; + uint8_t *grouped_exp_buffer; + int16_t *psd_buffer; + int16_t *band_psd_buffer; + int16_t *mask_buffer; + uint16_t *qmant_buffer; + uint8_t *cpl_coord_exp_buffer; + uint8_t *cpl_coord_mant_buffer; + + uint8_t exp_strategy[AC3_MAX_CHANNELS][AC3_MAX_BLOCKS]; ///< exponent strategies + uint8_t exp_ref_block[AC3_MAX_CHANNELS][AC3_MAX_BLOCKS]; ///< reference blocks for EXP_REUSE + uint8_t *ref_bap [AC3_MAX_CHANNELS][AC3_MAX_BLOCKS]; ///< bit allocation pointers (bap) + int ref_bap_set; ///< indicates if ref_bap pointers have been set + + DECLARE_ALIGNED(32, SampleType, windowed_samples)[AC3_WINDOW_SIZE]; +} AC3EncodeContext; + +#endif /* AVCODEC_AC3ENC_H */ diff --git a/libavcodec/eac3enc.c b/libavcodec/eac3enc.c new file mode 100644 index 0000000..20f4b87 --- /dev/null +++ b/libavcodec/eac3enc.c @@ -0,0 +1,131 @@ +/* + * E-AC-3 encoder + * Copyright (c) 2011 Justin Ruggles <justin.ruggles@gmail.com> + * + * This file is part of Libav. + * + * Libav is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2.1 of the License, or (at your option) any later version. + * + * Libav is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with Libav; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + */ + +/** + * @file + * E-AC-3 encoder + */ + +#define CONFIG_AC3ENC_FLOAT 1 +#include "ac3enc.h" +#include "eac3enc.h" + +void ff_eac3_set_cpl_states(AC3EncodeContext *s) +{ + int ch, blk; + int first_cpl_coords[AC3_MAX_CHANNELS]; + + /* set first cpl coords */ + for (ch = 1; ch <= s->fbw_channels; ch++) + first_cpl_coords[ch] = 1; + for (blk = 0; blk < AC3_MAX_BLOCKS; blk++) { + AC3Block *block = &s->blocks[blk]; + for (ch = 1; ch <= s->fbw_channels; ch++) { + if (block->channel_in_cpl[ch]) { + if (first_cpl_coords[ch]) { + block->new_cpl_coords = 2; + first_cpl_coords[ch] = 0; + } + } else { + first_cpl_coords[ch] = 1; + } + } + } + + /* set first cpl leak */ + for (blk = 0; blk < AC3_MAX_BLOCKS; blk++) { + AC3Block *block = &s->blocks[blk]; + if (block->cpl_in_use) { + block->new_cpl_leak = 2; + break; + } + } +} + + +void ff_eac3_output_frame_header(AC3EncodeContext *s) +{ + int blk, ch; + AC3EncOptions *opt = &s->options; + + put_bits(&s->pb, 16, 0x0b77); /* sync word */ + + /* BSI header */ + put_bits(&s->pb, 2, 0); /* stream type = independent */ + put_bits(&s->pb, 3, 0); /* substream id = 0 */ + put_bits(&s->pb, 11, (s->frame_size / 2) - 1); /* frame size */ + if (s->bit_alloc.sr_shift) { + put_bits(&s->pb, 2, 0x3); /* fscod2 */ + put_bits(&s->pb, 2, s->bit_alloc.sr_code); /* sample rate code */ + } else { + put_bits(&s->pb, 2, s->bit_alloc.sr_code); /* sample rate code */ + put_bits(&s->pb, 2, 0x3); /* number of blocks = 6 */ + } + put_bits(&s->pb, 3, s->channel_mode); /* audio coding mode */ + put_bits(&s->pb, 1, s->lfe_on); /* LFE channel indicator */ + put_bits(&s->pb, 5, s->bitstream_id); /* bitstream id (EAC3=16) */ + put_bits(&s->pb, 5, -opt->dialogue_level); /* dialogue normalization level */ + put_bits(&s->pb, 1, 0); /* no compression gain */ + put_bits(&s->pb, 1, 0); /* no mixing metadata */ + /* TODO: mixing metadata */ + put_bits(&s->pb, 1, 0); /* no info metadata */ + /* TODO: info metadata */ + put_bits(&s->pb, 1, 0); /* no additional bit stream info */ + + /* frame header */ + put_bits(&s->pb, 1, 1); /* exponent strategy syntax = each block */ + put_bits(&s->pb, 1, 0); /* aht enabled = no */ + put_bits(&s->pb, 2, 0); /* snr offset strategy = 1 */ + put_bits(&s->pb, 1, 0); /* transient pre-noise processing enabled = no */ + put_bits(&s->pb, 1, 0); /* block switch syntax enabled = no */ + put_bits(&s->pb, 1, 0); /* dither flag syntax enabled = no */ + put_bits(&s->pb, 1, 0); /* bit allocation model syntax enabled = no */ + put_bits(&s->pb, 1, 0); /* fast gain codes enabled = no */ + put_bits(&s->pb, 1, 0); /* dba syntax enabled = no */ + put_bits(&s->pb, 1, 0); /* skip field syntax enabled = no */ + put_bits(&s->pb, 1, 0); /* spx enabled = no */ + /* coupling strategy use flags */ + if (s->channel_mode > AC3_CHMODE_MONO) { + put_bits(&s->pb, 1, s->blocks[0].cpl_in_use); + for (blk = 1; blk < AC3_MAX_BLOCKS; blk++) { + AC3Block *block = &s->blocks[blk]; + put_bits(&s->pb, 1, block->new_cpl_strategy); + if (block->new_cpl_strategy) + put_bits(&s->pb, 1, block->cpl_in_use); + } + } + /* exponent strategy */ + for (blk = 0; blk < AC3_MAX_BLOCKS; blk++) + for (ch = !s->blocks[blk].cpl_in_use; ch <= s->fbw_channels; ch++) + put_bits(&s->pb, 2, s->exp_strategy[ch][blk]); + if (s->lfe_on) { + for (blk = 0; blk < AC3_MAX_BLOCKS; blk++) + put_bits(&s->pb, 1, s->exp_strategy[s->lfe_channel][blk]); + } + /* E-AC-3 to AC-3 converter exponent strategy (unfortunately not optional...) */ + for (ch = 1; ch <= s->fbw_channels; ch++) + put_bits(&s->pb, 5, 0); + /* snr offsets */ + put_bits(&s->pb, 6, s->coarse_snr_offset); + put_bits(&s->pb, 4, s->fine_snr_offset[1]); + /* block start info */ + put_bits(&s->pb, 1, 0); +} diff --git a/libavcodec/eac3enc.h b/libavcodec/eac3enc.h new file mode 100644 index 0000000..eacb8cf --- /dev/null +++ b/libavcodec/eac3enc.h @@ -0,0 +1,44 @@ +/* + * E-AC-3 encoder + * Copyright (c) 2011 Justin Ruggles <justin.ruggles@gmail.com> + * + * This file is part of Libav. + * + * Libav is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2.1 of the License, or (at your option) any later version. + * + * Libav is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with Libav; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + */ + +/** + * @file + * E-AC-3 encoder + */ + +#ifndef AVCODEC_EAC3ENC_H +#define AVCODEC_EAC3ENC_H + +#include "ac3enc.h" + +/** + * Set coupling states. + * This determines whether certain flags must be written to the bitstream or + * whether they will be implicitly already known by the decoder. + */ +void ff_eac3_set_cpl_states(AC3EncodeContext *s); + +/** + * Write the E-AC-3 frame header to the output bitstream. + */ +void ff_eac3_output_frame_header(AC3EncodeContext *s); + +#endif /* AVCODEC_EAC3ENC_H */ |