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/*****************************************************************
* gmerlin-avdecoder - a general purpose multimedia decoding library
*
* Copyright (c) 2001 - 2012 Members of the Gmerlin project
* gmerlin-general@lists.sourceforge.net
* http://gmerlin.sourceforge.net
*
* 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, see <http://www.gnu.org/licenses/>.
* *****************************************************************/
#include <avdec_private.h>
#include <qt.h>
#define LOG_DOMAIN "qt_timecode"
void bgav_qt_init_timecodes(bgav_input_context_t * input,
bgav_stream_t * s,
qt_trak_t * trak, int64_t pts_offset)
{
int i, j;
bgav_timecode_table_t * table;
int total_samples, num_samples;
int samples_read;
int64_t pts;
int64_t last_pos;
int stts_pos = 0;
int stsc_pos = 0;
int stts_count = 0;
int32_t timecode;
qt_stts_t * stts;
qt_stsc_t * stsc;
qt_stco_t * stco;
if(!(input->flags & BGAV_INPUT_CAN_SEEK_BYTE))
{
gavl_log(GAVL_LOG_WARNING, LOG_DOMAIN,
"Timecode tracks in non-seekable sources not supported");
return;
}
last_pos = input->position;
stts = &trak->mdia.minf.stbl.stts;
stsc = &trak->mdia.minf.stbl.stsc;
stco = &trak->mdia.minf.stbl.stco;
/* Set timecode format */
s->data.video.format->timecode_format.int_framerate =
trak->mdia.minf.stbl.stsd.entries[0].desc.format.timecode.numframes;
/* Flags:
*
* Drop frame
* Indicates whether the timecode is drop frame.
* Set it to 1 if the timecode is drop frame. This flag's value is 0x0001.
*
* 24 hour max
* Indicates whether the timecode wraps after 24 hours.
* Set it to 1 if the timecode wraps. This flag's value is 0x0002.
*
* Negative times OK
* Indicates whether negative time values are allowed.
* Set it to 1 if the timecode supports negative values. This flag's value is 0x0004.
*
* Counter
* Indicates whether the time value corresponds to a tape counter value.
* Set it to 1 if the timecode values are tape counter values. This flag's value is 0x0008.
*
*/
if(trak->mdia.minf.stbl.stsd.entries[0].desc.format.timecode.flags & 0x0001)
s->data.video.format->timecode_format.flags |= GAVL_TIMECODE_DROP_FRAME;
/* Count samples */
total_samples = 0;
for(i = 0; i < stts->num_entries; i++)
total_samples += stts->entries[i].count;
table = bgav_timecode_table_create(total_samples);
samples_read = 0;
pts = 0;
/* Read samples */
for(i = 0; i < stco->num_entries; i++)
{
bgav_input_seek(input, stco->entries[i], SEEK_SET);
num_samples = stsc->entries[stsc_pos].samples_per_chunk;
for(j = 0; j < num_samples; j++)
{
if(!bgav_input_read_32_be(input, (uint32_t*)(&timecode)))
{
gavl_log(GAVL_LOG_WARNING, LOG_DOMAIN,
"EOF while reading timecode");
goto fail;
}
table->entries[samples_read].pts = pts + pts_offset;
table->entries[samples_read].timecode =
gavl_timecode_from_framecount(&s->data.video.format->timecode_format, timecode);
samples_read++;
/* Advance pts + stts */
pts += stts->entries[stts_pos].duration;
stts_count++;
if(stts_count >= stts->entries[stts_pos].count)
{
stts_pos++;
stts_count = 0;
}
}
/* Advance stsc */
if((stsc_pos < stsc->num_entries - 1) &&
(i + 2 == stsc->entries[stsc_pos+1].first_chunk))
{
stsc_pos++;
}
}
s->timecode_table = table;
bgav_input_seek(input, last_pos, SEEK_SET);
return;
fail:
bgav_input_seek(input, last_pos, SEEK_SET);
bgav_timecode_table_destroy(table);
s->data.video.format->timecode_format.int_framerate = 0;
return;
}
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