libavcodec/eac3enc.c - manifest_repos/ffmpeg - Git at Google

 /*
  * E-AC-3 encoder
  * Copyright (c) 2011 Justin Ruggles <justin.ruggles@gmail.com>
  *
  * This file is part of FFmpeg.
  *
  * FFmpeg 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.
  *
  * FFmpeg 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 FFmpeg; 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 "libavutil/attributes.h"
 #include "ac3enc.h"
 #include "eac3enc.h"
 #include "eac3_data.h"


 #define AC3ENC_TYPE AC3ENC_TYPE_EAC3
 #include "ac3enc_opts_template.c"

 static const AVClass eac3enc_class = {
     .class_name = "E-AC-3 Encoder",
     .item_name  = av_default_item_name,
     .option     = ac3_options,
     .version    = LIBAVUTIL_VERSION_INT,
 };

 /**
  * LUT for finding a matching frame exponent strategy index from a set of
  * exponent strategies for a single channel across all 6 blocks.
  */
 static int8_t eac3_frame_expstr_index_tab[3][4][4][4][4][4];


 av_cold void ff_eac3_exponent_init(void)
 {
     int i;

     memset(eac3_frame_expstr_index_tab, -1, sizeof(eac3_frame_expstr_index_tab));
     for (i = 0; i < 32; i++) {
         eac3_frame_expstr_index_tab[ff_eac3_frm_expstr[i][0]-1]
                                    [ff_eac3_frm_expstr[i][1]]
                                    [ff_eac3_frm_expstr[i][2]]
                                    [ff_eac3_frm_expstr[i][3]]
                                    [ff_eac3_frm_expstr[i][4]]
                                    [ff_eac3_frm_expstr[i][5]] = i;
     }
 }


 void ff_eac3_get_frame_exp_strategy(AC3EncodeContext *s)
 {
     int ch;

     if (s->num_blocks < 6) {
         s->use_frame_exp_strategy = 0;
         return;
     }

     s->use_frame_exp_strategy = 1;
     for (ch = !s->cpl_on; ch <= s->fbw_channels; ch++) {
         int expstr = eac3_frame_expstr_index_tab[s->exp_strategy[ch][0]-1]
                                                 [s->exp_strategy[ch][1]]
                                                 [s->exp_strategy[ch][2]]
                                                 [s->exp_strategy[ch][3]]
                                                 [s->exp_strategy[ch][4]]
                                                 [s->exp_strategy[ch][5]];
         if (expstr < 0) {
             s->use_frame_exp_strategy = 0;
             break;
         }
         s->frame_exp_strategy[ch] = expstr;
     }
 }


 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 < s->num_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[ch] = 2;
                     first_cpl_coords[ch]  = 0;
                 }
             } else {
                 first_cpl_coords[ch] = 1;
             }
         }
     }

     /* set first cpl leak */
     for (blk = 0; blk < s->num_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, s->num_blks_code);      /* number of blocks */
     }
     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 */
     /* mixing metadata*/
     put_bits(&s->pb, 1, opt->eac3_mixing_metadata);
     if (opt->eac3_mixing_metadata) {
         if (s->channel_mode > AC3_CHMODE_STEREO)
             put_bits(&s->pb, 2, opt->preferred_stereo_downmix);
         if (s->has_center) {
             put_bits(&s->pb, 3, s->ltrt_center_mix_level);
             put_bits(&s->pb, 3, s->loro_center_mix_level);
         }
         if (s->has_surround) {
             put_bits(&s->pb, 3, s->ltrt_surround_mix_level);
             put_bits(&s->pb, 3, s->loro_surround_mix_level);
         }
         if (s->lfe_on)
             put_bits(&s->pb, 1, 0);
         put_bits(&s->pb, 1, 0);                     /* no program scale */
         put_bits(&s->pb, 1, 0);                     /* no ext program scale */
         put_bits(&s->pb, 2, 0);                     /* no mixing parameters */
         if (s->channel_mode < AC3_CHMODE_STEREO)
             put_bits(&s->pb, 1, 0);                 /* no pan info */
         put_bits(&s->pb, 1, 0);                     /* no frame mix config info */
     }
     /* info metadata*/
     put_bits(&s->pb, 1, opt->eac3_info_metadata);
     if (opt->eac3_info_metadata) {
         put_bits(&s->pb, 3, s->bitstream_mode);
         put_bits(&s->pb, 1, opt->copyright);
         put_bits(&s->pb, 1, opt->original);
         if (s->channel_mode == AC3_CHMODE_STEREO) {
             put_bits(&s->pb, 2, opt->dolby_surround_mode);
             put_bits(&s->pb, 2, opt->dolby_headphone_mode);
         }
         if (s->channel_mode >= AC3_CHMODE_2F2R)
             put_bits(&s->pb, 2, opt->dolby_surround_ex_mode);
         put_bits(&s->pb, 1, opt->audio_production_info);
         if (opt->audio_production_info) {
             put_bits(&s->pb, 5, opt->mixing_level - 80);
             put_bits(&s->pb, 2, opt->room_type);
             put_bits(&s->pb, 1, opt->ad_converter_type);
         }
         put_bits(&s->pb, 1, 0);
     }
     if (s->num_blocks != 6)
         put_bits(&s->pb, 1, !(s->avctx->frame_number % 6)); /* converter sync flag */
     put_bits(&s->pb, 1, 0);                         /* no additional bit stream info */

     /* frame header */
     if (s->num_blocks == 6) {
     put_bits(&s->pb, 1, !s->use_frame_exp_strategy);/* exponent strategy syntax */
     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 < s->num_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 */
     if (s->use_frame_exp_strategy) {
         for (ch = !s->cpl_on; ch <= s->fbw_channels; ch++)
             put_bits(&s->pb, 5, s->frame_exp_strategy[ch]);
     } else {
         for (blk = 0; blk < s->num_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 < s->num_blocks; blk++)
             put_bits(&s->pb, 1, s->exp_strategy[s->lfe_channel][blk]);
     }
     /* E-AC-3 to AC-3 converter exponent strategy (not optional when num blocks == 6) */
     if (s->num_blocks != 6) {
         put_bits(&s->pb, 1, 0);
     } else {
     for (ch = 1; ch <= s->fbw_channels; ch++) {
         if (s->use_frame_exp_strategy)
             put_bits(&s->pb, 5, s->frame_exp_strategy[ch]);
         else
             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 */
     if (s->num_blocks > 1)
         put_bits(&s->pb, 1, 0);
 }


 AVCodec ff_eac3_encoder = {
     .name            = "eac3",
     .long_name       = NULL_IF_CONFIG_SMALL("ATSC A/52 E-AC-3"),
     .type            = AVMEDIA_TYPE_AUDIO,
     .id              = AV_CODEC_ID_EAC3,
     .priv_data_size  = sizeof(AC3EncodeContext),
     .init            = ff_ac3_float_encode_init,
     .encode2         = ff_ac3_float_encode_frame,
     .close           = ff_ac3_encode_close,
     .sample_fmts     = (const enum AVSampleFormat[]){ AV_SAMPLE_FMT_FLTP,
                                                       AV_SAMPLE_FMT_NONE },
     .priv_class      = &eac3enc_class,
     .supported_samplerates = ff_ac3_sample_rate_tab,
     .channel_layouts = ff_ac3_channel_layouts,
     .defaults        = ac3_defaults,
     .caps_internal   = FF_CODEC_CAP_INIT_CLEANUP,
 };
	/*
	* E-AC-3 encoder
	* Copyright (c) 2011 Justin Ruggles <justin.ruggles@gmail.com>
	*
	* This file is part of FFmpeg.
	*
	* FFmpeg 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.
	*
	* FFmpeg 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 FFmpeg; 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 "libavutil/attributes.h"
	#include "ac3enc.h"
	#include "eac3enc.h"
	#include "eac3_data.h"


	#define AC3ENC_TYPE AC3ENC_TYPE_EAC3
	#include "ac3enc_opts_template.c"

	static const AVClass eac3enc_class = {
	.class_name = "E-AC-3 Encoder",
	.item_name = av_default_item_name,
	.option = ac3_options,
	.version = LIBAVUTIL_VERSION_INT,
	};

	/**
	* LUT for finding a matching frame exponent strategy index from a set of
	* exponent strategies for a single channel across all 6 blocks.
	*/
	static int8_t eac3_frame_expstr_index_tab[3][4][4][4][4][4];


	av_cold void ff_eac3_exponent_init(void)
	{
	int i;

	memset(eac3_frame_expstr_index_tab, -1, sizeof(eac3_frame_expstr_index_tab));
	for (i = 0; i < 32; i++) {
	eac3_frame_expstr_index_tab[ff_eac3_frm_expstr[i][0]-1]
	[ff_eac3_frm_expstr[i][1]]
	[ff_eac3_frm_expstr[i][2]]
	[ff_eac3_frm_expstr[i][3]]
	[ff_eac3_frm_expstr[i][4]]
	[ff_eac3_frm_expstr[i][5]] = i;
	}
	}


	void ff_eac3_get_frame_exp_strategy(AC3EncodeContext *s)
	{
	int ch;

	if (s->num_blocks < 6) {
	s->use_frame_exp_strategy = 0;
	return;
	}

	s->use_frame_exp_strategy = 1;
	for (ch = !s->cpl_on; ch <= s->fbw_channels; ch++) {
	int expstr = eac3_frame_expstr_index_tab[s->exp_strategy[ch][0]-1]
	[s->exp_strategy[ch][1]]
	[s->exp_strategy[ch][2]]
	[s->exp_strategy[ch][3]]
	[s->exp_strategy[ch][4]]
	[s->exp_strategy[ch][5]];
	if (expstr < 0) {
	s->use_frame_exp_strategy = 0;
	break;
	}
	s->frame_exp_strategy[ch] = expstr;
	}
	}



	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 < s->num_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[ch] = 2;
	first_cpl_coords[ch] = 0;
	}
	} else {
	first_cpl_coords[ch] = 1;
	}
	}
	}

	/* set first cpl leak */
	for (blk = 0; blk < s->num_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, s->num_blks_code); /* number of blocks */
	}
	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 */
	/* mixing metadata*/
	put_bits(&s->pb, 1, opt->eac3_mixing_metadata);
	if (opt->eac3_mixing_metadata) {
	if (s->channel_mode > AC3_CHMODE_STEREO)
	put_bits(&s->pb, 2, opt->preferred_stereo_downmix);
	if (s->has_center) {
	put_bits(&s->pb, 3, s->ltrt_center_mix_level);
	put_bits(&s->pb, 3, s->loro_center_mix_level);
	}
	if (s->has_surround) {
	put_bits(&s->pb, 3, s->ltrt_surround_mix_level);
	put_bits(&s->pb, 3, s->loro_surround_mix_level);
	}
	if (s->lfe_on)
	put_bits(&s->pb, 1, 0);
	put_bits(&s->pb, 1, 0); /* no program scale */
	put_bits(&s->pb, 1, 0); /* no ext program scale */
	put_bits(&s->pb, 2, 0); /* no mixing parameters */
	if (s->channel_mode < AC3_CHMODE_STEREO)
	put_bits(&s->pb, 1, 0); /* no pan info */
	put_bits(&s->pb, 1, 0); /* no frame mix config info */
	}
	/* info metadata*/
	put_bits(&s->pb, 1, opt->eac3_info_metadata);
	if (opt->eac3_info_metadata) {
	put_bits(&s->pb, 3, s->bitstream_mode);
	put_bits(&s->pb, 1, opt->copyright);
	put_bits(&s->pb, 1, opt->original);
	if (s->channel_mode == AC3_CHMODE_STEREO) {
	put_bits(&s->pb, 2, opt->dolby_surround_mode);
	put_bits(&s->pb, 2, opt->dolby_headphone_mode);
	}
	if (s->channel_mode >= AC3_CHMODE_2F2R)
	put_bits(&s->pb, 2, opt->dolby_surround_ex_mode);
	put_bits(&s->pb, 1, opt->audio_production_info);
	if (opt->audio_production_info) {
	put_bits(&s->pb, 5, opt->mixing_level - 80);
	put_bits(&s->pb, 2, opt->room_type);
	put_bits(&s->pb, 1, opt->ad_converter_type);
	}
	put_bits(&s->pb, 1, 0);
	}
	if (s->num_blocks != 6)
	put_bits(&s->pb, 1, !(s->avctx->frame_number % 6)); /* converter sync flag */
	put_bits(&s->pb, 1, 0); /* no additional bit stream info */

	/* frame header */
	if (s->num_blocks == 6) {
	put_bits(&s->pb, 1, !s->use_frame_exp_strategy);/* exponent strategy syntax */
	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 < s->num_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 */
	if (s->use_frame_exp_strategy) {
	for (ch = !s->cpl_on; ch <= s->fbw_channels; ch++)
	put_bits(&s->pb, 5, s->frame_exp_strategy[ch]);
	} else {
	for (blk = 0; blk < s->num_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 < s->num_blocks; blk++)
	put_bits(&s->pb, 1, s->exp_strategy[s->lfe_channel][blk]);
	}
	/* E-AC-3 to AC-3 converter exponent strategy (not optional when num blocks == 6) */
	if (s->num_blocks != 6) {
	put_bits(&s->pb, 1, 0);
	} else {
	for (ch = 1; ch <= s->fbw_channels; ch++) {
	if (s->use_frame_exp_strategy)
	put_bits(&s->pb, 5, s->frame_exp_strategy[ch]);
	else
	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 */
	if (s->num_blocks > 1)
	put_bits(&s->pb, 1, 0);
	}


	AVCodec ff_eac3_encoder = {
	.name = "eac3",
	.long_name = NULL_IF_CONFIG_SMALL("ATSC A/52 E-AC-3"),
	.type = AVMEDIA_TYPE_AUDIO,
	.id = AV_CODEC_ID_EAC3,
	.priv_data_size = sizeof(AC3EncodeContext),
	.init = ff_ac3_float_encode_init,
	.encode2 = ff_ac3_float_encode_frame,
	.close = ff_ac3_encode_close,
	.sample_fmts = (const enum AVSampleFormat[]){ AV_SAMPLE_FMT_FLTP,
	AV_SAMPLE_FMT_NONE },
	.priv_class = &eac3enc_class,
	.supported_samplerates = ff_ac3_sample_rate_tab,
	.channel_layouts = ff_ac3_channel_layouts,
	.defaults = ac3_defaults,
	.caps_internal = FF_CODEC_CAP_INIT_CLEANUP,
	};