timecode.c
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/*****************************************************************************
* timecode.c: timecode file input
*****************************************************************************
* Copyright (C) 2010-2024 x264 project
*
* Authors: Yusuke Nakamura <muken.the.vfrmaniac@gmail.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02111, USA.
*
* This program is also available under a commercial proprietary license.
* For more information, contact us at licensing@x264.com.
*****************************************************************************/
#include "input.h"
#define FAIL_IF_ERROR( cond, ... ) FAIL_IF_ERR( cond, "timecode", __VA_ARGS__ )
typedef struct
{
cli_input_t input;
hnd_t p_handle;
int auto_timebase_num;
int auto_timebase_den;
uint64_t timebase_num;
uint64_t timebase_den;
int stored_pts_num;
int64_t *pts;
double assume_fps;
double last_timecode;
} timecode_hnd_t;
static inline double sigexp10( double value, double *exponent )
{
/* This function separates significand and exp10 from double floating point. */
*exponent = pow( 10, floor( log10( value ) ) );
return value / *exponent;
}
#define DOUBLE_EPSILON 5e-6
#define MKV_TIMEBASE_DEN 1000000000
static double correct_fps( double fps, timecode_hnd_t *h )
{
int i = 1;
uint64_t fps_num, fps_den;
double exponent;
double fps_sig = sigexp10( fps, &exponent );
while( 1 )
{
fps_den = i * h->timebase_num;
fps_num = round( fps_den * fps_sig ) * exponent;
FAIL_IF_ERROR( fps_num > UINT32_MAX, "tcfile fps correction failed.\n"
" Specify an appropriate timebase manually or remake tcfile.\n" );
if( fabs( ((double)fps_num / fps_den) / exponent - fps_sig ) < DOUBLE_EPSILON )
break;
++i;
}
if( h->auto_timebase_den )
{
h->timebase_den = h->timebase_den ? lcm( h->timebase_den, fps_num ) : fps_num;
if( h->timebase_den > UINT32_MAX )
h->auto_timebase_den = 0;
}
return (double)fps_num / fps_den;
}
static int try_mkv_timebase_den( double *fpss, timecode_hnd_t *h, int loop_num )
{
h->timebase_num = 0;
h->timebase_den = MKV_TIMEBASE_DEN;
for( int num = 0; num < loop_num; num++ )
{
uint64_t fps_den;
double exponent;
double fps_sig = sigexp10( fpss[num], &exponent );
fps_den = round( MKV_TIMEBASE_DEN / fps_sig ) / exponent;
h->timebase_num = fps_den && h->timebase_num ? gcd( h->timebase_num, fps_den ) : fps_den;
FAIL_IF_ERROR( h->timebase_num > UINT32_MAX || !h->timebase_num, "automatic timebase generation failed.\n"
" Specify timebase manually.\n" );
}
return 0;
}
static int parse_tcfile( FILE *tcfile_in, timecode_hnd_t *h, video_info_t *info )
{
char buff[256];
int ret, tcfv, num, seq_num, timecodes_num;
double *timecodes = NULL;
double *fpss = NULL;
ret = fgets( buff, sizeof(buff), tcfile_in ) != NULL &&
(sscanf( buff, "# timecode format v%d", &tcfv ) == 1 || sscanf( buff, "# timestamp format v%d", &tcfv ) == 1);
FAIL_IF_ERROR( !ret || (tcfv != 1 && tcfv != 2), "unsupported timecode format\n" );
#define NO_TIMECODE_LINE (buff[0] == '#' || buff[0] == '\n' || buff[0] == '\r')
if( tcfv == 1 )
{
int64_t file_pos;
double assume_fps, seq_fps;
int start, end = -1;
int prev_start = -1, prev_end = -1;
h->assume_fps = 0;
for( num = 2; fgets( buff, sizeof(buff), tcfile_in ) != NULL; num++ )
{
if( NO_TIMECODE_LINE )
continue;
FAIL_IF_ERROR( sscanf( buff, "assume %lf", &h->assume_fps ) != 1 && sscanf( buff, "Assume %lf", &h->assume_fps ) != 1,
"tcfile parsing error: assumed fps not found\n" );
break;
}
FAIL_IF_ERROR( h->assume_fps <= 0, "invalid assumed fps %.6f\n", h->assume_fps );
file_pos = ftell( tcfile_in );
h->stored_pts_num = 0;
for( seq_num = 0; fgets( buff, sizeof(buff), tcfile_in ) != NULL; num++ )
{
if( NO_TIMECODE_LINE )
{
if( sscanf( buff, "# TDecimate Mode 3: Last Frame = %d", &end ) == 1 )
h->stored_pts_num = end + 1;
continue;
}
ret = sscanf( buff, "%d,%d,%lf", &start, &end, &seq_fps );
FAIL_IF_ERROR( ret != 3 && ret != EOF, "invalid input tcfile\n" );
FAIL_IF_ERROR( start > end || start <= prev_start || end <= prev_end || seq_fps <= 0,
"invalid input tcfile at line %d: %s\n", num, buff );
prev_start = start;
prev_end = end;
if( h->auto_timebase_den || h->auto_timebase_num )
++seq_num;
}
if( !h->stored_pts_num )
h->stored_pts_num = end + 2;
timecodes_num = h->stored_pts_num;
fseek( tcfile_in, file_pos, SEEK_SET );
timecodes = malloc( timecodes_num * sizeof(double) );
if( !timecodes )
return -1;
if( h->auto_timebase_den || h->auto_timebase_num )
{
fpss = malloc( (seq_num + 1) * sizeof(double) );
if( !fpss )
goto fail;
}
assume_fps = correct_fps( h->assume_fps, h );
if( assume_fps < 0 )
goto fail;
timecodes[0] = 0;
for( num = seq_num = 0; num < timecodes_num - 1 && fgets( buff, sizeof(buff), tcfile_in ) != NULL; )
{
if( NO_TIMECODE_LINE )
continue;
ret = sscanf( buff, "%d,%d,%lf", &start, &end, &seq_fps );
if( ret != 3 )
start = end = timecodes_num - 1;
for( ; num < start && num < timecodes_num - 1; num++ )
timecodes[num + 1] = timecodes[num] + 1 / assume_fps;
if( num < timecodes_num - 1 )
{
if( h->auto_timebase_den || h->auto_timebase_num )
fpss[seq_num++] = seq_fps;
seq_fps = correct_fps( seq_fps, h );
if( seq_fps < 0 )
goto fail;
for( num = start; num <= end && num < timecodes_num - 1; num++ )
timecodes[num + 1] = timecodes[num] + 1 / seq_fps;
}
}
for( ; num < timecodes_num - 1; num++ )
timecodes[num + 1] = timecodes[num] + 1 / assume_fps;
if( h->auto_timebase_den || h->auto_timebase_num )
fpss[seq_num] = h->assume_fps;
if( h->auto_timebase_num && !h->auto_timebase_den )
{
double exponent;
double assume_fps_sig, seq_fps_sig;
if( try_mkv_timebase_den( fpss, h, seq_num + 1 ) < 0 )
goto fail;
fseek( tcfile_in, file_pos, SEEK_SET );
assume_fps_sig = sigexp10( h->assume_fps, &exponent );
assume_fps = MKV_TIMEBASE_DEN / ( round( MKV_TIMEBASE_DEN / assume_fps_sig ) / exponent );
for( num = 0; num < timecodes_num - 1 && fgets( buff, sizeof(buff), tcfile_in ) != NULL; )
{
if( NO_TIMECODE_LINE )
continue;
ret = sscanf( buff, "%d,%d,%lf", &start, &end, &seq_fps );
if( ret != 3 )
start = end = timecodes_num - 1;
seq_fps_sig = sigexp10( seq_fps, &exponent );
seq_fps = MKV_TIMEBASE_DEN / ( round( MKV_TIMEBASE_DEN / seq_fps_sig ) / exponent );
for( ; num < start && num < timecodes_num - 1; num++ )
timecodes[num + 1] = timecodes[num] + 1 / assume_fps;
for( num = start; num <= end && num < timecodes_num - 1; num++ )
timecodes[num + 1] = timecodes[num] + 1 / seq_fps;
}
for( ; num < timecodes_num - 1; num++ )
timecodes[num + 1] = timecodes[num] + 1 / assume_fps;
}
if( fpss )
{
free( fpss );
fpss = NULL;
}
h->assume_fps = assume_fps;
h->last_timecode = timecodes[timecodes_num - 1];
}
else /* tcfv == 2 */
{
int64_t file_pos = ftell( tcfile_in );
h->stored_pts_num = 0;
while( fgets( buff, sizeof(buff), tcfile_in ) != NULL )
{
if( NO_TIMECODE_LINE )
{
if( !h->stored_pts_num )
file_pos = ftell( tcfile_in );
continue;
}
h->stored_pts_num++;
}
timecodes_num = h->stored_pts_num;
FAIL_IF_ERROR( !timecodes_num, "input tcfile doesn't have any timecodes!\n" );
fseek( tcfile_in, file_pos, SEEK_SET );
timecodes = malloc( timecodes_num * sizeof(double) );
if( !timecodes )
return -1;
num = 0;
if( fgets( buff, sizeof(buff), tcfile_in ) != NULL )
{
ret = sscanf( buff, "%lf", &timecodes[0] );
timecodes[0] *= 1e-3; /* Timecode format v2 is expressed in milliseconds. */
FAIL_IF_ERROR( ret != 1, "invalid input tcfile for frame 0\n" );
for( num = 1; num < timecodes_num && fgets( buff, sizeof(buff), tcfile_in ) != NULL; )
{
if( NO_TIMECODE_LINE )
continue;
ret = sscanf( buff, "%lf", &timecodes[num] );
timecodes[num] *= 1e-3; /* Timecode format v2 is expressed in milliseconds. */
FAIL_IF_ERROR( ret != 1 || timecodes[num] <= timecodes[num - 1],
"invalid input tcfile for frame %d\n", num );
++num;
}
}
FAIL_IF_ERROR( num < timecodes_num, "failed to read input tcfile for frame %d", num );
if( timecodes_num == 1 )
h->timebase_den = info->fps_num;
else if( h->auto_timebase_den )
{
fpss = malloc( (timecodes_num - 1) * sizeof(double) );
if( !fpss )
goto fail;
for( num = 0; num < timecodes_num - 1; num++ )
{
fpss[num] = 1 / (timecodes[num + 1] - timecodes[num]);
if( h->auto_timebase_den )
{
int i = 1;
uint64_t fps_num, fps_den;
double exponent;
double fps_sig = sigexp10( fpss[num], &exponent );
while( 1 )
{
fps_den = i * h->timebase_num;
fps_num = round( fps_den * fps_sig ) * exponent;
if( fps_num > UINT32_MAX || fabs( ((double)fps_num / fps_den) / exponent - fps_sig ) < DOUBLE_EPSILON )
break;
++i;
}
h->timebase_den = fps_num && h->timebase_den ? lcm( h->timebase_den, fps_num ) : fps_num;
if( h->timebase_den > UINT32_MAX )
{
h->auto_timebase_den = 0;
continue;
}
}
}
if( h->auto_timebase_num && !h->auto_timebase_den )
if( try_mkv_timebase_den( fpss, h, timecodes_num - 1 ) < 0 )
goto fail;
free( fpss );
fpss = NULL;
}
if( timecodes_num > 1 )
h->assume_fps = 1 / (timecodes[timecodes_num - 1] - timecodes[timecodes_num - 2]);
else
h->assume_fps = (double)info->fps_num / info->fps_den;
h->last_timecode = timecodes[timecodes_num - 1];
}
#undef NO_TIMECODE_LINE
if( h->auto_timebase_den || h->auto_timebase_num )
{
uint64_t i = gcd( h->timebase_num, h->timebase_den );
h->timebase_num /= i;
h->timebase_den /= i;
x264_cli_log( "timecode", X264_LOG_INFO, "automatic timebase generation %"PRIu64"/%"PRIu64"\n", h->timebase_num, h->timebase_den );
}
else FAIL_IF_ERROR( h->timebase_den > UINT32_MAX || !h->timebase_den, "automatic timebase generation failed.\n"
" Specify an appropriate timebase manually.\n" );
h->pts = malloc( h->stored_pts_num * sizeof(int64_t) );
if( !h->pts )
goto fail;
for( num = 0; num < h->stored_pts_num; num++ )
{
h->pts[num] = timecodes[num] * ((double)h->timebase_den / h->timebase_num) + 0.5;
FAIL_IF_ERROR( num > 0 && h->pts[num] <= h->pts[num - 1], "invalid timebase or timecode for frame %d\n", num );
}
free( timecodes );
return 0;
fail:
if( timecodes )
free( timecodes );
if( fpss )
free( fpss );
return -1;
}
#undef DOUBLE_EPSILON
#undef MKV_TIMEBASE_DEN
static int open_file( char *psz_filename, hnd_t *p_handle, video_info_t *info, cli_input_opt_t *opt )
{
int ret = 0;
FILE *tcfile_in;
timecode_hnd_t *h = malloc( sizeof(timecode_hnd_t) );
FAIL_IF_ERROR( !h, "malloc failed\n" );
h->input = cli_input;
h->p_handle = *p_handle;
h->pts = NULL;
if( opt->timebase )
{
ret = sscanf( opt->timebase, "%"SCNu64"/%"SCNu64, &h->timebase_num, &h->timebase_den );
if( ret == 1 )
{
h->timebase_num = strtoul( opt->timebase, NULL, 10 );
h->timebase_den = 0; /* set later by auto timebase generation */
}
FAIL_IF_ERROR( h->timebase_num > UINT32_MAX || h->timebase_den > UINT32_MAX,
"timebase you specified exceeds H.264 maximum\n" );
}
h->auto_timebase_num = !ret;
h->auto_timebase_den = ret < 2;
if( h->auto_timebase_num )
h->timebase_num = info->fps_den; /* can be changed later by auto timebase generation */
if( h->auto_timebase_den )
h->timebase_den = 0; /* set later by auto timebase generation */
tcfile_in = x264_fopen( psz_filename, "rb" );
FAIL_IF_ERROR( !tcfile_in, "can't open `%s'\n", psz_filename );
if( !x264_is_regular_file( tcfile_in ) )
{
x264_cli_log( "timecode", X264_LOG_ERROR, "tcfile input incompatible with non-regular file `%s'\n", psz_filename );
fclose( tcfile_in );
return -1;
}
if( parse_tcfile( tcfile_in, h, info ) < 0 )
{
if( h->pts )
free( h->pts );
fclose( tcfile_in );
return -1;
}
fclose( tcfile_in );
info->timebase_num = h->timebase_num;
info->timebase_den = h->timebase_den;
info->vfr = 1;
*p_handle = h;
return 0;
}
static int64_t get_frame_pts( timecode_hnd_t *h, int frame, int real_frame )
{
if( frame < h->stored_pts_num )
return h->pts[frame];
else
{
if( h->pts && real_frame )
{
x264_cli_log( "timecode", X264_LOG_INFO, "input timecode file missing data for frame %d and later\n"
" assuming constant fps %.6f\n", frame, h->assume_fps );
free( h->pts );
h->pts = NULL;
}
double timecode = h->last_timecode + 1 / h->assume_fps;
if( real_frame )
h->last_timecode = timecode;
return timecode * ((double)h->timebase_den / h->timebase_num) + 0.5;
}
}
static int read_frame( cli_pic_t *pic, hnd_t handle, int frame )
{
timecode_hnd_t *h = handle;
if( h->input.read_frame( pic, h->p_handle, frame ) )
return -1;
pic->pts = get_frame_pts( h, frame, 1 );
pic->duration = get_frame_pts( h, frame + 1, 0 ) - pic->pts;
return 0;
}
static int release_frame( cli_pic_t *pic, hnd_t handle )
{
timecode_hnd_t *h = handle;
if( h->input.release_frame )
return h->input.release_frame( pic, h->p_handle );
return 0;
}
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 };