349 lines
12 KiB
C
349 lines
12 KiB
C
/*****************************************************************************
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* mp4.c: mp4 muxer
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*****************************************************************************
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* Copyright (C) 2003-2025 x264 project
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*
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* Authors: Laurent Aimar <fenrir@via.ecp.fr>
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* Loren Merritt <lorenm@u.washington.edu>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02111, USA.
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*
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* This program is also available under a commercial proprietary license.
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* For more information, contact us at licensing@x264.com.
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*****************************************************************************/
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#include "output.h"
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#include <gpac/isomedia.h>
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typedef struct
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{
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GF_ISOFile *p_file;
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GF_AVCConfig *p_config;
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GF_ISOSample *p_sample;
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int i_track;
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uint32_t i_descidx;
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uint64_t i_time_res;
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int64_t i_time_inc;
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int64_t i_delay_time;
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int64_t i_init_delta;
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int i_numframe;
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int i_delay_frames;
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int b_dts_compress;
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int i_dts_compress_multiplier;
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int i_data_size;
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} mp4_hnd_t;
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static void recompute_bitrate_mp4( GF_ISOFile *p_file, int i_track )
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{
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u32 count, di, timescale, time_wnd, rate;
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u64 offset;
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Double br;
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GF_ESD *esd;
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esd = gf_isom_get_esd( p_file, i_track, 1 );
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if( !esd )
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return;
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esd->decoderConfig->avgBitrate = 0;
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esd->decoderConfig->maxBitrate = 0;
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rate = time_wnd = 0;
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timescale = gf_isom_get_media_timescale( p_file, i_track );
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count = gf_isom_get_sample_count( p_file, i_track );
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for( u32 i = 0; i < count; i++ )
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{
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GF_ISOSample *samp = gf_isom_get_sample_info( p_file, i_track, i+1, &di, &offset );
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if( !samp )
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{
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x264_cli_log( "mp4", X264_LOG_ERROR, "failure reading back frame %u\n", i );
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break;
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}
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if( esd->decoderConfig->bufferSizeDB < samp->dataLength )
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esd->decoderConfig->bufferSizeDB = samp->dataLength;
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esd->decoderConfig->avgBitrate += samp->dataLength;
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rate += samp->dataLength;
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if( samp->DTS > time_wnd + timescale )
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{
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if( rate > esd->decoderConfig->maxBitrate )
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esd->decoderConfig->maxBitrate = rate;
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time_wnd = samp->DTS;
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rate = 0;
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}
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gf_isom_sample_del( &samp );
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}
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br = (Double)(s64)gf_isom_get_media_duration( p_file, i_track );
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br /= timescale;
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esd->decoderConfig->avgBitrate = (u32)(esd->decoderConfig->avgBitrate / br);
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/*move to bps*/
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esd->decoderConfig->avgBitrate *= 8;
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esd->decoderConfig->maxBitrate *= 8;
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gf_isom_change_mpeg4_description( p_file, i_track, 1, esd );
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gf_odf_desc_del( (GF_Descriptor*)esd );
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}
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static int close_file( hnd_t handle, int64_t largest_pts, int64_t second_largest_pts )
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{
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mp4_hnd_t *p_mp4 = handle;
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if( !p_mp4 )
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return 0;
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if( p_mp4->p_config )
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gf_odf_avc_cfg_del( p_mp4->p_config );
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if( p_mp4->p_sample )
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{
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if( p_mp4->p_sample->data )
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free( p_mp4->p_sample->data );
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p_mp4->p_sample->dataLength = 0;
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gf_isom_sample_del( &p_mp4->p_sample );
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}
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if( p_mp4->p_file )
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{
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if( p_mp4->i_track )
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{
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/* The mdhd duration is defined as CTS[final] - CTS[0] + duration of last frame.
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* The mdhd duration (in seconds) should be able to be longer than the tkhd duration since the track is managed by edts.
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* So, if mdhd duration is equal to the last DTS or less, we give the last composition time delta to the last sample duration.
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* And then, the mdhd duration is updated, but it time-wise doesn't give the actual duration.
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* The tkhd duration is the actual track duration. */
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uint64_t mdhd_duration = (2 * largest_pts - second_largest_pts) * p_mp4->i_time_inc;
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if( mdhd_duration != gf_isom_get_media_duration( p_mp4->p_file, p_mp4->i_track ) )
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{
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uint64_t last_dts = gf_isom_get_sample_dts( p_mp4->p_file, p_mp4->i_track, p_mp4->i_numframe );
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uint32_t last_duration = (uint32_t)( mdhd_duration > last_dts ? mdhd_duration - last_dts : (largest_pts - second_largest_pts) * p_mp4->i_time_inc );
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gf_isom_set_last_sample_duration( p_mp4->p_file, p_mp4->i_track, last_duration );
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}
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/* Write an Edit Box if the first CTS offset is positive.
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* A media_time is given by not the mvhd timescale but rather the mdhd timescale.
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* The reason is that an Edit Box maps the presentation time-line to the media time-line.
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* Any demuxers should follow the Edit Box if it exists. */
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GF_ISOSample *sample = gf_isom_get_sample_info( p_mp4->p_file, p_mp4->i_track, 1, NULL, NULL );
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if( sample && sample->CTS_Offset > 0 )
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{
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uint32_t mvhd_timescale = gf_isom_get_timescale( p_mp4->p_file );
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uint64_t tkhd_duration = (uint64_t)( mdhd_duration * ( (double)mvhd_timescale / p_mp4->i_time_res ) );
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#if GPAC_VERSION_MAJOR > 8
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gf_isom_append_edit( p_mp4->p_file, p_mp4->i_track, tkhd_duration, sample->CTS_Offset, GF_ISOM_EDIT_NORMAL );
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#else
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gf_isom_append_edit_segment( p_mp4->p_file, p_mp4->i_track, tkhd_duration, sample->CTS_Offset, GF_ISOM_EDIT_NORMAL );
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#endif
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}
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gf_isom_sample_del( &sample );
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recompute_bitrate_mp4( p_mp4->p_file, p_mp4->i_track );
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}
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gf_isom_set_pl_indication( p_mp4->p_file, GF_ISOM_PL_VISUAL, 0x15 );
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gf_isom_set_storage_mode( p_mp4->p_file, GF_ISOM_STORE_FLAT );
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gf_isom_close( p_mp4->p_file );
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}
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free( p_mp4 );
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return 0;
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}
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static int open_file( char *psz_filename, hnd_t *p_handle, cli_output_opt_t *opt )
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{
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*p_handle = NULL;
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FILE *fh = x264_fopen( psz_filename, "w" );
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if( !fh )
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return -1;
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int b_regular = x264_is_regular_file( fh );
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fclose( fh );
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FAIL_IF_ERR( !b_regular, "mp4", "MP4 output is incompatible with non-regular file `%s'\n", psz_filename );
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mp4_hnd_t *p_mp4 = calloc( 1, sizeof(mp4_hnd_t) );
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if( !p_mp4 )
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return -1;
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p_mp4->p_file = gf_isom_open( psz_filename, GF_ISOM_OPEN_WRITE, NULL );
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p_mp4->b_dts_compress = opt->use_dts_compress;
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if( !(p_mp4->p_sample = gf_isom_sample_new()) )
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{
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close_file( p_mp4, 0, 0 );
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return -1;
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}
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gf_isom_set_brand_info( p_mp4->p_file, GF_ISOM_BRAND_AVC1, 0 );
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*p_handle = p_mp4;
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return 0;
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}
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static int set_param( hnd_t handle, x264_param_t *p_param )
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{
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mp4_hnd_t *p_mp4 = handle;
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p_mp4->i_delay_frames = p_param->i_bframe ? (p_param->i_bframe_pyramid ? 2 : 1) : 0;
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p_mp4->i_dts_compress_multiplier = p_mp4->b_dts_compress * p_mp4->i_delay_frames + 1;
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p_mp4->i_time_res = (uint64_t)p_param->i_timebase_den * p_mp4->i_dts_compress_multiplier;
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p_mp4->i_time_inc = (uint64_t)p_param->i_timebase_num * p_mp4->i_dts_compress_multiplier;
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FAIL_IF_ERR( p_mp4->i_time_res > UINT32_MAX, "mp4", "MP4 media timescale %"PRIu64" exceeds maximum\n", p_mp4->i_time_res );
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p_mp4->i_track = gf_isom_new_track( p_mp4->p_file, 0, GF_ISOM_MEDIA_VISUAL,
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p_mp4->i_time_res );
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p_mp4->p_config = gf_odf_avc_cfg_new();
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gf_isom_avc_config_new( p_mp4->p_file, p_mp4->i_track, p_mp4->p_config,
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NULL, NULL, &p_mp4->i_descidx );
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gf_isom_set_track_enabled( p_mp4->p_file, p_mp4->i_track, 1 );
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gf_isom_set_visual_info( p_mp4->p_file, p_mp4->i_track, p_mp4->i_descidx,
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p_param->i_width, p_param->i_height );
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if( p_param->vui.i_sar_width && p_param->vui.i_sar_height )
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{
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uint64_t dw = p_param->i_width << 16;
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uint64_t dh = p_param->i_height << 16;
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double sar = (double)p_param->vui.i_sar_width / p_param->vui.i_sar_height;
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if( sar > 1.0 )
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dw *= sar;
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else
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dh /= sar;
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gf_isom_set_pixel_aspect_ratio( p_mp4->p_file, p_mp4->i_track, p_mp4->i_descidx, p_param->vui.i_sar_width, p_param->vui.i_sar_height, 0 );
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gf_isom_set_track_layout_info( p_mp4->p_file, p_mp4->i_track, dw, dh, 0, 0, 0 );
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}
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p_mp4->i_data_size = p_param->i_width * p_param->i_height * 3 / 2;
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p_mp4->p_sample->data = malloc( p_mp4->i_data_size );
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if( !p_mp4->p_sample->data )
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{
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p_mp4->i_data_size = 0;
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return -1;
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}
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return 0;
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}
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static int check_buffer( mp4_hnd_t *p_mp4, int needed_size )
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{
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if( needed_size > p_mp4->i_data_size )
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{
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void *ptr = realloc( p_mp4->p_sample->data, needed_size );
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if( !ptr )
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return -1;
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p_mp4->p_sample->data = ptr;
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p_mp4->i_data_size = needed_size;
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}
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return 0;
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}
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static int write_headers( hnd_t handle, x264_nal_t *p_nal )
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{
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mp4_hnd_t *p_mp4 = handle;
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GF_AVCConfigSlot *p_slot;
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int sps_size = p_nal[0].i_payload - 4;
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int pps_size = p_nal[1].i_payload - 4;
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int sei_size = p_nal[2].i_payload;
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uint8_t *sps = p_nal[0].p_payload + 4;
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uint8_t *pps = p_nal[1].p_payload + 4;
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uint8_t *sei = p_nal[2].p_payload;
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// SPS
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p_mp4->p_config->configurationVersion = 1;
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p_mp4->p_config->AVCProfileIndication = sps[1];
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p_mp4->p_config->profile_compatibility = sps[2];
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p_mp4->p_config->AVCLevelIndication = sps[3];
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p_slot = malloc( sizeof(GF_AVCConfigSlot) );
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if( !p_slot )
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return -1;
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p_slot->size = sps_size;
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p_slot->data = malloc( p_slot->size );
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if( !p_slot->data )
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return -1;
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memcpy( p_slot->data, sps, sps_size );
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gf_list_add( p_mp4->p_config->sequenceParameterSets, p_slot );
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// PPS
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p_slot = malloc( sizeof(GF_AVCConfigSlot) );
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if( !p_slot )
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return -1;
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p_slot->size = pps_size;
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p_slot->data = malloc( p_slot->size );
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if( !p_slot->data )
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return -1;
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memcpy( p_slot->data, pps, pps_size );
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gf_list_add( p_mp4->p_config->pictureParameterSets, p_slot );
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gf_isom_avc_config_update( p_mp4->p_file, p_mp4->i_track, 1, p_mp4->p_config );
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// SEI
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if( check_buffer( p_mp4, p_mp4->p_sample->dataLength + sei_size ) )
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return -1;
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memcpy( p_mp4->p_sample->data + p_mp4->p_sample->dataLength, sei, sei_size );
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p_mp4->p_sample->dataLength += sei_size;
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return sei_size + sps_size + pps_size;
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}
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static int write_frame( hnd_t handle, uint8_t *p_nalu, int i_size, x264_picture_t *p_picture )
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{
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mp4_hnd_t *p_mp4 = handle;
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int64_t dts;
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int64_t cts;
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if( check_buffer( p_mp4, p_mp4->p_sample->dataLength + i_size ) )
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return -1;
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memcpy( p_mp4->p_sample->data + p_mp4->p_sample->dataLength, p_nalu, i_size );
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p_mp4->p_sample->dataLength += i_size;
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if( !p_mp4->i_numframe )
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p_mp4->i_delay_time = p_picture->i_dts * -1;
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if( p_mp4->b_dts_compress )
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{
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if( p_mp4->i_numframe == 1 )
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p_mp4->i_init_delta = (p_picture->i_dts + p_mp4->i_delay_time) * p_mp4->i_time_inc;
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dts = p_mp4->i_numframe > p_mp4->i_delay_frames
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? p_picture->i_dts * p_mp4->i_time_inc
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: p_mp4->i_numframe * (p_mp4->i_init_delta / p_mp4->i_dts_compress_multiplier);
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cts = p_picture->i_pts * p_mp4->i_time_inc;
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}
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else
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{
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dts = (p_picture->i_dts + p_mp4->i_delay_time) * p_mp4->i_time_inc;
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cts = (p_picture->i_pts + p_mp4->i_delay_time) * p_mp4->i_time_inc;
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}
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p_mp4->p_sample->IsRAP = p_picture->b_keyframe;
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p_mp4->p_sample->DTS = dts;
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p_mp4->p_sample->CTS_Offset = (uint32_t)(cts - dts);
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gf_isom_add_sample( p_mp4->p_file, p_mp4->i_track, p_mp4->i_descidx, p_mp4->p_sample );
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p_mp4->p_sample->dataLength = 0;
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p_mp4->i_numframe++;
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return i_size;
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}
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const cli_output_t mp4_output = { open_file, set_param, write_headers, write_frame, close_file };
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