void mp4_read_safe_constructor(struct mp4_read_struct *p) {
mp4_file_safe_constructor(&p->file);
p->video_handle = -1;
p->audio_handle = -1;
p->current_audio_track = 0;
p->video_buffer_0 = 0;
p->video_buffer_1 = 0;
p->audio_buffer_0 = 0;
p->audio_buffer_1 = 0;
p->audio_cache_buffer = 0;
}
void mp4_file_close(struct mp4_file_struct *p) {
if (p->info != 0) {
mp4info_close(p->info);
}
int i;
for(i=0; i < 4; i++) {
if ( p->subtitle_track_time[i] )
free_64(p->subtitle_track_time[i]);
}
if ( p->avc_sps )
free_64(p->avc_sps);
if ( p->avc_pps )
free_64(p->avc_pps);
if ( p->samples )
free_64(p->samples);
if ( p->indexes )
free_64(p->indexes);
mp4_file_safe_constructor(p);
}
char *mp4_file_open(struct mp4_file_struct *p, char *s) {
mp4_file_safe_constructor(p);
p->info = mp4info_open(s);
if (p->info == 0){
mp4_file_close(p);
return("mp4_file_open: can't open file");
}
int i;
for(i = 0; i < p->info->total_tracks; i++) {
mp4info_track_t* track = p->info->tracks[i];
if (track->type != MP4_TRACK_VIDEO)
continue;
if ( track->width < 1 || track->height < 1 )
continue;
if ( track->width > 720 || track->height > 480 )
continue;
if ( track->video_type == 0x61766331 /*avc1*/) {
if ( track->avc_profile==0x42 && (track->width > 480 || track->height > 272) )
continue;
}
else {
if ( track->width > 480 || track->height > 272 )
continue;
}
p->video_track_id = i;
p->video_type = track->video_type;
if ( p->video_type == 0x61766331 ) {
p->avc_profile = track->avc_profile;
p->avc_sps_size = track->avc_sps_size;
p->avc_pps_size = track->avc_pps_size;
p->avc_nal_prefix_size = track->avc_nal_prefix_size;
p->avc_sps = malloc_64(p->avc_sps_size);
if ( ! p->avc_sps ) {
mp4_file_close(p);
return("mp4_file_open: can't malloc avc_sps buffer");
}
memcpy(p->avc_sps, track->avc_sps, p->avc_sps_size);
p->avc_pps = malloc_64(p->avc_pps_size);
if ( ! p->avc_pps ) {
mp4_file_close(p);
return("mp4_file_open: can't malloc avc_pps buffer");
}
memcpy(p->avc_pps, track->avc_pps, p->avc_pps_size);
}
else {
p->mp4v_decinfo_size = track->mp4v_decinfo_size;
p->mp4v_decinfo = malloc_64(p->mp4v_decinfo_size);
if ( ! p->mp4v_decinfo ) {
mp4_file_close(p);
return("mp4_file_open: can't malloc mp4v_decinfo buffer");
}
memcpy(p->mp4v_decinfo, track->mp4v_decinfo, p->mp4v_decinfo_size);
}
break;
}
if ( p->video_track_id < 0 ) {
mp4_file_close(p);
return("mp4_file_open: can't found video track in mp4 file");
}
for(i = 0; i < p->info->total_tracks; i++) {
mp4info_track_t* track = p->info->tracks[i];
if (track->type != MP4_TRACK_AUDIO)
continue;
if ( p->audio_tracks == 0 ) {
if ( track->audio_type != 0x6D703461 && track->audio_type != 0x73616D72 )
continue;
// if ( track->channels != 2 )
// continue;
if ( track->samplerate != 8000 && track->samplerate != 22050 && track->samplerate != 24000 && track->samplerate != 44100 && track->samplerate != 48000 )
continue;
// if ( track->samplebits != 16 )
// continue;
p->audio_tracks++;
p->audio_track_ids[p->audio_tracks-1] = i;
p->audio_type = track->audio_type;
if ( track->samplerate == 22050 || track->samplerate == 24000 )
p->audio_up_sample = 1;
else if ( track->samplerate == 8000 )
p->audio_up_sample = 5;
}
else {
mp4info_track_t* old_track = p->info->tracks[p->audio_track_ids[p->audio_tracks-1]];
if ( old_track->audio_type != track->audio_type )
continue;
// if ( old_track->channels != track->channels )
// continue;
if ( old_track->samplerate != track->samplerate )
continue;
// if ( old_track->samplebits != track->samplebits )
// continue;
p->audio_tracks++;
p->audio_track_ids[p->audio_tracks-1] = i;
}
if ( p->audio_tracks == 6 )
break;
}
if ( p->audio_tracks == 0 ) {
mp4_file_close(p);
return("mp4_file_open: can't found audio track in mp4 file");
}
// int sample_id = 0;
// unsigned int trunk_size = 0;
// int j, k;
//
// mp4info_track_t* video_track = p->info->tracks[p->video_track_id];
// for( i = 0; i < video_track->stsc_entry_count-1; i++ ) {
// int trunk_num = video_track->stsc_first_chunk[i+1] - video_track->stsc_first_chunk[i];
// for( j = 0; j < trunk_num; j++ ) {
// trunk_size = 0;
// for( k = 0; k < video_track->stsc_samples_per_chunk[i]; k++, sample_id++) {
// unsigned int sample_size = (video_track->stsz_sample_size ? video_track->stsz_sample_size : video_track->stsz_sample_size_table[sample_id]);
// if ( sample_size > p->maximum_video_sample_size )
// p->maximum_video_sample_size = sample_size;
// trunk_size += sample_size;
// }
// if ( trunk_size > p->maximum_video_trunk_size )
// p->maximum_video_trunk_size = trunk_size;
// }
// }
// trunk_size = 0;
// for( k = 0; k < video_track->stsc_samples_per_chunk[i]; k++, sample_id++)
// trunk_size += (video_track->stsz_sample_size ? video_track->stsz_sample_size : video_track->stsz_sample_size_table[sample_id]);
// if ( trunk_size > p->maximum_video_trunk_size )
// p->maximum_video_trunk_size = trunk_size;
//
// int l;
// for( l = 0; l < p->audio_tracks; l++ ) {
// sample_id = 0;
// mp4info_track_t* audio_track = p->info->tracks[p->audio_track_ids[l]];
// for( i = 0; i < audio_track->stsc_entry_count-1; i++ ) {
// int trunk_num = audio_track->stsc_first_chunk[i+1] - audio_track->stsc_first_chunk[i];
// for( j = 0; j < trunk_num; j++ ) {
// trunk_size = 0;
// for( k = 0; k < audio_track->stsc_samples_per_chunk[i]; k++, sample_id++) {
// unsigned int sample_size = (audio_track->stsz_sample_size ? audio_track->stsz_sample_size : audio_track->stsz_sample_size_table[sample_id]);
// if ( sample_size > p->maximum_audio_sample_size )
// p->maximum_audio_sample_size = sample_size;
// trunk_size += sample_size;
// }
// if ( trunk_size > p->maximum_audio_trunk_size )
// p->maximum_audio_trunk_size = trunk_size;
// }
// }
// trunk_size = 0;
// for( k = 0; k < audio_track->stsc_samples_per_chunk[i]; k++, sample_id++) {
// unsigned int sample_size = (audio_track->stsz_sample_size ? audio_track->stsz_sample_size : audio_track->stsz_sample_size_table[sample_id]);
// if ( sample_size > p->maximum_audio_sample_size )
// p->maximum_audio_sample_size = sample_size;
// trunk_size += sample_size;
// }
// if ( trunk_size > p->maximum_audio_trunk_size )
// p->maximum_audio_trunk_size = trunk_size;
// }
p->video_width = p->info->tracks[p->video_track_id]->width;
p->video_height = p->info->tracks[p->video_track_id]->height;
p->number_of_video_frames = 0;
for( i = 0; i < p->info->tracks[p->video_track_id]->stts_entry_count; i++)
p->number_of_video_frames += p->info->tracks[p->video_track_id]->stts_sample_count[i];
//p->number_of_video_frames = p->info->tracks[p->video_track_id]->stts_sample_count[0];
p->video_rate = p->info->tracks[p->video_track_id]->time_scale;
p->video_scale = p->info->tracks[p->video_track_id]->duration / p->number_of_video_frames;
//p->video_scale = p->info->tracks[p->video_track_id]->stts_sample_duration[0];
p->audio_actual_rate = p->info->tracks[p->audio_track_ids[0]]->samplerate;
p->audio_rate = p->audio_actual_rate * (p->audio_up_sample+1) ;
p->audio_scale = (p->audio_type == 0x6D703461 ? 1024 : 160);
p->audio_resample_scale = p->audio_scale * (p->audio_up_sample+1);
p->audio_stereo = 1;
int64_t v0 = p->video_rate * p->audio_resample_scale;
int64_t v1 = p->audio_rate * p->video_scale;
if (v0 >= v1)
p->video_audio_interval = (int)(v0 / v1);
else
p->video_audio_interval = (int)(-(v1/v0));
return(mp4_file_build_index(p));
}
