int bg_avdec_start(void * priv)
{
int i;
const gavl_video_format_t * format;
avdec_priv * avdec = priv;
if(!bgav_start(avdec->dec))
{
return 0;
}
for(i = 0; i < avdec->current_track->num_video_streams; i++)
{
gavl_video_format_copy(&(avdec->current_track->video_streams[i].format),
bgav_get_video_format(avdec->dec, i));
gavl_metadata_copy(&avdec->current_track->video_streams[i].m,
bgav_get_video_metadata(avdec->dec, i));
avdec->current_track->video_streams[i].duration =
bgav_video_duration(avdec->dec, i);
}
for(i = 0; i < avdec->current_track->num_audio_streams; i++)
{
gavl_audio_format_copy(&(avdec->current_track->audio_streams[i].format),
bgav_get_audio_format(avdec->dec, i));
gavl_metadata_copy(&avdec->current_track->audio_streams[i].m,
bgav_get_audio_metadata(avdec->dec, i));
avdec->current_track->audio_streams[i].duration =
bgav_audio_duration(avdec->dec, i);
}
for(i = 0; i < avdec->current_track->num_text_streams; i++)
{
gavl_metadata_copy(&avdec->current_track->text_streams[i].m,
bgav_get_text_metadata(avdec->dec, i));
avdec->current_track->text_streams[i].duration =
bgav_text_duration(avdec->dec, i);
avdec->current_track->text_streams[i].timescale =
bgav_get_text_timescale(avdec->dec, i);
}
for(i = 0; i < avdec->current_track->num_overlay_streams; i++)
{
gavl_metadata_copy(&avdec->current_track->overlay_streams[i].m,
bgav_get_overlay_metadata(avdec->dec, i));
avdec->current_track->overlay_streams[i].duration =
bgav_overlay_duration(avdec->dec, i);
format = bgav_get_overlay_format(avdec->dec, i);
gavl_video_format_copy(&avdec->current_track->overlay_streams[i].format,
format);
}
return 1;
}
bool ReadMedia::initFormat() {
const gavl_audio_format_t * open_audio_format;
const gavl_video_format_t * open_video_format;
// we use the m_vfifosize to see if the user app wants video or not
// then, we set m_video_stream_count to 0 if he doesn't want video
if (m_video_stream_count > 0 && m_vfifosize > 0) {
open_video_format = bgav_get_video_format(m_file, 0);
if (open_video_format->pixelformat == GAVL_PIXELFORMAT_NONE) {
printf("!!!sorry, pixelformat is not recognized.\n");
return false;
}
// let's check to see if the formats are the same, if they are the same
// there is no reason to recreate the fifo or frames
if ( gavl_video_formats_equal( &m_video_format, open_video_format) == 0 ) {
// the formats are different
gavl_video_format_copy (&m_video_format, open_video_format);
if (m_video_frame != NULL)
gavl_video_frame_destroy(m_video_frame);
m_video_frame = gavl_video_frame_create(&m_video_format);
gavl_video_frame_clear( m_video_frame, &m_video_format);
if (m_fifovideo != NULL)
delete m_fifovideo;
m_fifovideo= new FifoVideoFrames( m_vfifosize , &m_video_format);
}
} else {
m_video_stream_count = 0;
m_veof = true;
}
// we use the m_afifosize to see if the user app wants audio or not
// then, we set m_audio_stream_count to 0 if he doesn't want audio
if (m_audio_stream_count > 0 && m_afifosize > 0) {
open_audio_format = bgav_get_audio_format(m_file, 0);
// we can get audio formats that are unkown
if ( open_audio_format->sample_format == GAVL_SAMPLE_NONE) {
printf("sorry, this file has unsupported audio.\n");
return false;
}
if ( gavl_audio_formats_equal(&m_audio_format, open_audio_format) == 0 ) {
// audio formats are different
// save the old spf
int spf = m_audio_format.samples_per_frame;
gavl_audio_format_copy(&m_audio_format, open_audio_format);
if (m_audio_frame != NULL) {
gavl_audio_frame_destroy(m_audio_frame);
}
// set it back to original
m_audio_format.samples_per_frame = spf ;
m_audio_frame = gavl_audio_frame_create(&m_audio_format);
gavl_audio_frame_mute( m_audio_frame, &m_audio_format);
if( m_fifoaudio != NULL )
delete m_fifoaudio;
m_fifoaudio = new FifoAudioFrames( m_afifosize , &m_audio_format);
}
} else {
// user doesn't want audio
m_audio_stream_count = 0;
m_aeof=true;
}
m_length_in_gavltime = bgav_get_duration ( m_file, 0);;
m_length_in_seconds = gavl_time_to_seconds( m_length_in_gavltime );
m_num_samples = 0;
m_num_frames = 0;
if (m_audio_stream_count) {
if ( bgav_can_seek_sample(m_file) == 1 ) {
m_num_samples= bgav_audio_duration ( m_file, 0) ;
} else {
m_num_samples= gavl_time_to_samples( m_audio_format.samplerate , bgav_get_duration ( m_file, 0) );
}
}
// set frames WE NEED TO take care here for non-constant frame-rates
if(m_video_stream_count) {
if ( bgav_can_seek_sample(m_file) == 1 && m_video_format.framerate_mode == GAVL_FRAMERATE_CONSTANT) {
m_num_frames = bgav_video_duration ( m_file, 0)/ m_video_format.frame_duration;
} else if ( bgav_can_seek_sample(m_file) == 1 && m_video_format.framerate_mode == GAVL_FRAMERATE_VARIABLE ) {
// FIXME what to do with non constant frame rates?
m_num_frames=0;
} else {
m_num_frames = gavl_time_to_frames( m_video_format.timescale, m_video_format.frame_duration , bgav_get_duration ( m_file, 0) );
}
}
// printf("m_num_frames =%lld, duration = %lld , vid_duration=%lld\n",
// m_num_frames, bgav_get_duration ( m_file, 0), bgav_video_duration ( m_file, 0) );
// set seconds
if ( bgav_can_seek_sample(m_file) == 1) {
gavl_time_t atime=0,vtime=0;
if ( m_audio_stream_count )
atime = gavl_samples_to_time( m_audio_format.samplerate, m_num_samples );
if (m_video_stream_count && m_video_format.frame_duration > 0) {
vtime = gavl_frames_to_time( m_video_format.timescale, m_video_format.frame_duration, m_num_frames );
} else if ( m_video_stream_count ) { // non constant framerate
vtime = bgav_video_duration( m_file, 0);
}
// else rely on audio time
m_length_in_gavltime = atime > vtime ? atime :vtime;
m_length_in_seconds = gavl_time_to_seconds( m_length_in_gavltime );
//printf("atime=%ld, vtime=%ld, l_in_sec=%f\n", atime, vtime, m_length_in_seconds);
}
m_pcm_seek = SEEK_NOTHING;
m_frame_seek = SEEK_NOTHING;
return true;
}
