460 lines
17 KiB
C
460 lines
17 KiB
C
/*****************************************************************************
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* timecode.c: timecode file input
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*****************************************************************************
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* Copyright (C) 2010-2025 x264 project
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*
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* Authors: Yusuke Nakamura <muken.the.vfrmaniac@gmail.com>
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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 "input.h"
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#define FAIL_IF_ERROR( cond, ... ) FAIL_IF_ERR( cond, "timecode", __VA_ARGS__ )
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typedef struct
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{
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cli_input_t input;
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hnd_t p_handle;
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int auto_timebase_num;
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int auto_timebase_den;
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uint64_t timebase_num;
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uint64_t timebase_den;
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int stored_pts_num;
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int64_t *pts;
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double assume_fps;
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double last_timecode;
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} timecode_hnd_t;
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static inline double sigexp10( double value, double *exponent )
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{
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/* This function separates significand and exp10 from double floating point. */
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*exponent = pow( 10, floor( log10( value ) ) );
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return value / *exponent;
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}
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#define DOUBLE_EPSILON 5e-6
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#define MKV_TIMEBASE_DEN 1000000000
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static double correct_fps( double fps, timecode_hnd_t *h )
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{
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int i = 1;
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uint64_t fps_num, fps_den;
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double exponent;
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double fps_sig = sigexp10( fps, &exponent );
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while( 1 )
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{
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fps_den = i * h->timebase_num;
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fps_num = round( fps_den * fps_sig ) * exponent;
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FAIL_IF_ERROR( fps_num > UINT32_MAX, "tcfile fps correction failed.\n"
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" Specify an appropriate timebase manually or remake tcfile.\n" );
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if( fabs( ((double)fps_num / fps_den) / exponent - fps_sig ) < DOUBLE_EPSILON )
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break;
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++i;
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}
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if( h->auto_timebase_den )
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{
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h->timebase_den = h->timebase_den ? lcm( h->timebase_den, fps_num ) : fps_num;
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if( h->timebase_den > UINT32_MAX )
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h->auto_timebase_den = 0;
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}
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return (double)fps_num / fps_den;
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}
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static int try_mkv_timebase_den( double *fpss, timecode_hnd_t *h, int loop_num )
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{
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h->timebase_num = 0;
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h->timebase_den = MKV_TIMEBASE_DEN;
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for( int num = 0; num < loop_num; num++ )
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{
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uint64_t fps_den;
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double exponent;
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double fps_sig = sigexp10( fpss[num], &exponent );
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fps_den = round( MKV_TIMEBASE_DEN / fps_sig ) / exponent;
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h->timebase_num = fps_den && h->timebase_num ? gcd( h->timebase_num, fps_den ) : fps_den;
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FAIL_IF_ERROR( h->timebase_num > UINT32_MAX || !h->timebase_num, "automatic timebase generation failed.\n"
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" Specify timebase manually.\n" );
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}
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return 0;
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}
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static int parse_tcfile( FILE *tcfile_in, timecode_hnd_t *h, video_info_t *info )
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{
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char buff[256];
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int ret, tcfv, num, seq_num, timecodes_num;
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double *timecodes = NULL;
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double *fpss = NULL;
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ret = fgets( buff, sizeof(buff), tcfile_in ) != NULL &&
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(sscanf( buff, "# timecode format v%d", &tcfv ) == 1 || sscanf( buff, "# timestamp format v%d", &tcfv ) == 1);
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FAIL_IF_ERROR( !ret || (tcfv != 1 && tcfv != 2), "unsupported timecode format\n" );
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#define NO_TIMECODE_LINE (buff[0] == '#' || buff[0] == '\n' || buff[0] == '\r')
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if( tcfv == 1 )
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{
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int64_t file_pos;
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double assume_fps, seq_fps;
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int start, end = -1;
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int prev_start = -1, prev_end = -1;
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h->assume_fps = 0;
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for( num = 2; fgets( buff, sizeof(buff), tcfile_in ) != NULL; num++ )
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{
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if( NO_TIMECODE_LINE )
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continue;
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FAIL_IF_ERROR( sscanf( buff, "assume %lf", &h->assume_fps ) != 1 && sscanf( buff, "Assume %lf", &h->assume_fps ) != 1,
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"tcfile parsing error: assumed fps not found\n" );
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break;
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}
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FAIL_IF_ERROR( h->assume_fps <= 0, "invalid assumed fps %.6f\n", h->assume_fps );
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file_pos = ftell( tcfile_in );
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h->stored_pts_num = 0;
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for( seq_num = 0; fgets( buff, sizeof(buff), tcfile_in ) != NULL; num++ )
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{
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if( NO_TIMECODE_LINE )
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{
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if( sscanf( buff, "# TDecimate Mode 3: Last Frame = %d", &end ) == 1 )
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h->stored_pts_num = end + 1;
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continue;
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}
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ret = sscanf( buff, "%d,%d,%lf", &start, &end, &seq_fps );
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FAIL_IF_ERROR( ret != 3 && ret != EOF, "invalid input tcfile\n" );
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FAIL_IF_ERROR( start > end || start <= prev_start || end <= prev_end || seq_fps <= 0,
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"invalid input tcfile at line %d: %s\n", num, buff );
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prev_start = start;
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prev_end = end;
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if( h->auto_timebase_den || h->auto_timebase_num )
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++seq_num;
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}
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if( !h->stored_pts_num )
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h->stored_pts_num = end + 2;
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timecodes_num = h->stored_pts_num;
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fseek( tcfile_in, file_pos, SEEK_SET );
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timecodes = malloc( timecodes_num * sizeof(double) );
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if( !timecodes )
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return -1;
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if( h->auto_timebase_den || h->auto_timebase_num )
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{
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fpss = malloc( (seq_num + 1) * sizeof(double) );
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if( !fpss )
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goto fail;
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}
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assume_fps = correct_fps( h->assume_fps, h );
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if( assume_fps < 0 )
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goto fail;
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timecodes[0] = 0;
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for( num = seq_num = 0; num < timecodes_num - 1 && fgets( buff, sizeof(buff), tcfile_in ) != NULL; )
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{
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if( NO_TIMECODE_LINE )
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continue;
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ret = sscanf( buff, "%d,%d,%lf", &start, &end, &seq_fps );
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if( ret != 3 )
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start = end = timecodes_num - 1;
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for( ; num < start && num < timecodes_num - 1; num++ )
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timecodes[num + 1] = timecodes[num] + 1 / assume_fps;
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if( num < timecodes_num - 1 )
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{
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if( h->auto_timebase_den || h->auto_timebase_num )
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fpss[seq_num++] = seq_fps;
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seq_fps = correct_fps( seq_fps, h );
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if( seq_fps < 0 )
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goto fail;
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for( num = start; num <= end && num < timecodes_num - 1; num++ )
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timecodes[num + 1] = timecodes[num] + 1 / seq_fps;
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}
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}
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for( ; num < timecodes_num - 1; num++ )
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timecodes[num + 1] = timecodes[num] + 1 / assume_fps;
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if( h->auto_timebase_den || h->auto_timebase_num )
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fpss[seq_num] = h->assume_fps;
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if( h->auto_timebase_num && !h->auto_timebase_den )
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{
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double exponent;
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double assume_fps_sig, seq_fps_sig;
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if( try_mkv_timebase_den( fpss, h, seq_num + 1 ) < 0 )
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goto fail;
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fseek( tcfile_in, file_pos, SEEK_SET );
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assume_fps_sig = sigexp10( h->assume_fps, &exponent );
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assume_fps = MKV_TIMEBASE_DEN / ( round( MKV_TIMEBASE_DEN / assume_fps_sig ) / exponent );
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for( num = 0; num < timecodes_num - 1 && fgets( buff, sizeof(buff), tcfile_in ) != NULL; )
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{
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if( NO_TIMECODE_LINE )
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continue;
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ret = sscanf( buff, "%d,%d,%lf", &start, &end, &seq_fps );
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if( ret != 3 )
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start = end = timecodes_num - 1;
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seq_fps_sig = sigexp10( seq_fps, &exponent );
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seq_fps = MKV_TIMEBASE_DEN / ( round( MKV_TIMEBASE_DEN / seq_fps_sig ) / exponent );
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for( ; num < start && num < timecodes_num - 1; num++ )
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timecodes[num + 1] = timecodes[num] + 1 / assume_fps;
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for( num = start; num <= end && num < timecodes_num - 1; num++ )
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timecodes[num + 1] = timecodes[num] + 1 / seq_fps;
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}
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for( ; num < timecodes_num - 1; num++ )
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timecodes[num + 1] = timecodes[num] + 1 / assume_fps;
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}
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if( fpss )
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{
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free( fpss );
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fpss = NULL;
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}
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h->assume_fps = assume_fps;
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h->last_timecode = timecodes[timecodes_num - 1];
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}
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else /* tcfv == 2 */
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{
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int64_t file_pos = ftell( tcfile_in );
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h->stored_pts_num = 0;
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while( fgets( buff, sizeof(buff), tcfile_in ) != NULL )
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{
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if( NO_TIMECODE_LINE )
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{
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if( !h->stored_pts_num )
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file_pos = ftell( tcfile_in );
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continue;
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}
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h->stored_pts_num++;
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}
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timecodes_num = h->stored_pts_num;
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FAIL_IF_ERROR( !timecodes_num, "input tcfile doesn't have any timecodes!\n" );
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fseek( tcfile_in, file_pos, SEEK_SET );
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timecodes = malloc( timecodes_num * sizeof(double) );
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if( !timecodes )
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return -1;
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num = 0;
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if( fgets( buff, sizeof(buff), tcfile_in ) != NULL )
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{
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ret = sscanf( buff, "%lf", &timecodes[0] );
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timecodes[0] *= 1e-3; /* Timecode format v2 is expressed in milliseconds. */
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FAIL_IF_ERROR( ret != 1, "invalid input tcfile for frame 0\n" );
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for( num = 1; num < timecodes_num && fgets( buff, sizeof(buff), tcfile_in ) != NULL; )
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{
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if( NO_TIMECODE_LINE )
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continue;
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ret = sscanf( buff, "%lf", &timecodes[num] );
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timecodes[num] *= 1e-3; /* Timecode format v2 is expressed in milliseconds. */
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FAIL_IF_ERROR( ret != 1 || timecodes[num] <= timecodes[num - 1],
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"invalid input tcfile for frame %d\n", num );
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++num;
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}
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}
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FAIL_IF_ERROR( num < timecodes_num, "failed to read input tcfile for frame %d", num );
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if( timecodes_num == 1 )
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h->timebase_den = info->fps_num;
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else if( h->auto_timebase_den )
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{
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fpss = malloc( (timecodes_num - 1) * sizeof(double) );
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if( !fpss )
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goto fail;
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for( num = 0; num < timecodes_num - 1; num++ )
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{
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fpss[num] = 1 / (timecodes[num + 1] - timecodes[num]);
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if( h->auto_timebase_den )
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{
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int i = 1;
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uint64_t fps_num, fps_den;
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double exponent;
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double fps_sig = sigexp10( fpss[num], &exponent );
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while( 1 )
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{
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fps_den = i * h->timebase_num;
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fps_num = round( fps_den * fps_sig ) * exponent;
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if( fps_num > UINT32_MAX || fabs( ((double)fps_num / fps_den) / exponent - fps_sig ) < DOUBLE_EPSILON )
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break;
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++i;
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}
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h->timebase_den = fps_num && h->timebase_den ? lcm( h->timebase_den, fps_num ) : fps_num;
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if( h->timebase_den > UINT32_MAX )
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{
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h->auto_timebase_den = 0;
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continue;
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}
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}
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}
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if( h->auto_timebase_num && !h->auto_timebase_den )
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if( try_mkv_timebase_den( fpss, h, timecodes_num - 1 ) < 0 )
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goto fail;
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free( fpss );
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fpss = NULL;
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}
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if( timecodes_num > 1 )
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h->assume_fps = 1 / (timecodes[timecodes_num - 1] - timecodes[timecodes_num - 2]);
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else
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h->assume_fps = (double)info->fps_num / info->fps_den;
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h->last_timecode = timecodes[timecodes_num - 1];
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}
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#undef NO_TIMECODE_LINE
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if( h->auto_timebase_den || h->auto_timebase_num )
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{
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uint64_t i = gcd( h->timebase_num, h->timebase_den );
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h->timebase_num /= i;
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h->timebase_den /= i;
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x264_cli_log( "timecode", X264_LOG_INFO, "automatic timebase generation %"PRIu64"/%"PRIu64"\n", h->timebase_num, h->timebase_den );
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}
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else FAIL_IF_ERROR( h->timebase_den > UINT32_MAX || !h->timebase_den, "automatic timebase generation failed.\n"
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" Specify an appropriate timebase manually.\n" );
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h->pts = malloc( h->stored_pts_num * sizeof(int64_t) );
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if( !h->pts )
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goto fail;
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for( num = 0; num < h->stored_pts_num; num++ )
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{
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h->pts[num] = timecodes[num] * ((double)h->timebase_den / h->timebase_num) + 0.5;
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FAIL_IF_ERROR( num > 0 && h->pts[num] <= h->pts[num - 1], "invalid timebase or timecode for frame %d\n", num );
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}
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free( timecodes );
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return 0;
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fail:
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if( timecodes )
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free( timecodes );
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if( fpss )
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free( fpss );
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return -1;
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}
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#undef DOUBLE_EPSILON
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#undef MKV_TIMEBASE_DEN
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static int open_file( char *psz_filename, hnd_t *p_handle, video_info_t *info, cli_input_opt_t *opt )
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{
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int ret = 0;
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FILE *tcfile_in;
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timecode_hnd_t *h = malloc( sizeof(timecode_hnd_t) );
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FAIL_IF_ERROR( !h, "malloc failed\n" );
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h->input = cli_input;
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h->p_handle = *p_handle;
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h->pts = NULL;
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if( opt->timebase )
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{
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ret = sscanf( opt->timebase, "%"SCNu64"/%"SCNu64, &h->timebase_num, &h->timebase_den );
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if( ret == 1 )
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{
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h->timebase_num = strtoul( opt->timebase, NULL, 10 );
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h->timebase_den = 0; /* set later by auto timebase generation */
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}
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FAIL_IF_ERROR( h->timebase_num > UINT32_MAX || h->timebase_den > UINT32_MAX,
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"timebase you specified exceeds H.264 maximum\n" );
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}
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h->auto_timebase_num = !ret;
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h->auto_timebase_den = ret < 2;
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if( h->auto_timebase_num )
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h->timebase_num = info->fps_den; /* can be changed later by auto timebase generation */
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if( h->auto_timebase_den )
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h->timebase_den = 0; /* set later by auto timebase generation */
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tcfile_in = x264_fopen( psz_filename, "rb" );
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FAIL_IF_ERROR( !tcfile_in, "can't open `%s'\n", psz_filename );
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if( !x264_is_regular_file( tcfile_in ) )
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{
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x264_cli_log( "timecode", X264_LOG_ERROR, "tcfile input incompatible with non-regular file `%s'\n", psz_filename );
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fclose( tcfile_in );
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return -1;
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}
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if( parse_tcfile( tcfile_in, h, info ) < 0 )
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{
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if( h->pts )
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free( h->pts );
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fclose( tcfile_in );
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return -1;
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}
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fclose( tcfile_in );
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info->timebase_num = h->timebase_num;
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info->timebase_den = h->timebase_den;
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info->vfr = 1;
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*p_handle = h;
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return 0;
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}
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static int64_t get_frame_pts( timecode_hnd_t *h, int frame, int real_frame )
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{
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if( frame < h->stored_pts_num )
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return h->pts[frame];
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else
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{
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if( h->pts && real_frame )
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{
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x264_cli_log( "timecode", X264_LOG_INFO, "input timecode file missing data for frame %d and later\n"
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" assuming constant fps %.6f\n", frame, h->assume_fps );
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free( h->pts );
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h->pts = NULL;
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}
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double timecode = h->last_timecode + 1 / h->assume_fps;
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if( real_frame )
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h->last_timecode = timecode;
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return timecode * ((double)h->timebase_den / h->timebase_num) + 0.5;
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}
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}
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static int read_frame( cli_pic_t *pic, hnd_t handle, int frame )
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{
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timecode_hnd_t *h = handle;
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if( h->input.read_frame( pic, h->p_handle, frame ) )
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return -1;
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pic->pts = get_frame_pts( h, frame, 1 );
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pic->duration = get_frame_pts( h, frame + 1, 0 ) - pic->pts;
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return 0;
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}
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static int release_frame( cli_pic_t *pic, hnd_t handle )
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{
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timecode_hnd_t *h = handle;
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if( h->input.release_frame )
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return h->input.release_frame( pic, h->p_handle );
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return 0;
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}
|
|
|
|
static int picture_alloc( cli_pic_t *pic, hnd_t handle, int csp, int width, int height )
|
|
{
|
|
timecode_hnd_t *h = handle;
|
|
return h->input.picture_alloc( pic, h->p_handle, csp, width, height );
|
|
}
|
|
|
|
static void picture_clean( cli_pic_t *pic, hnd_t handle )
|
|
{
|
|
timecode_hnd_t *h = handle;
|
|
h->input.picture_clean( pic, h->p_handle );
|
|
}
|
|
|
|
static int close_file( hnd_t handle )
|
|
{
|
|
timecode_hnd_t *h = handle;
|
|
if( h->pts )
|
|
free( h->pts );
|
|
h->input.close_file( h->p_handle );
|
|
free( h );
|
|
return 0;
|
|
}
|
|
|
|
const cli_input_t timecode_input = { open_file, picture_alloc, read_frame, release_frame, picture_clean, close_file };
|