char *mp4_read_get_audio(struct mp4_read_struct *p, unsigned int packet, unsigned int audio_stream, struct mp4_audio_read_output_struct *output){
char *result = 0;
if (p->interleaving.output_video_frame_number > packet) {
time_math_interleaving_constructor(&p->interleaving,
p->file.video_rate,
p->file.video_scale,
p->file.audio_rate,
p->file.audio_resample_scale);
time_math_interleaving_get(&p->interleaving);
}
while (p->interleaving.output_video_frame_number != packet) {
time_math_interleaving_get(&p->interleaving);
}
mp4info_track_t* track;
unsigned int first_audio_frame, last_audio_frame;
first_audio_frame = p->interleaving.output_audio_frame_number;
last_audio_frame = p->interleaving.output_audio_frame_number + p->interleaving.output_number_of_audio_frames - 1;
output->number_of_audio_frames = p->interleaving.output_number_of_audio_frames;
track = p->file.info->tracks[p->file.audio_track_ids[audio_stream]];
int i;
void *audio_buffer;
void *audio_output_buffer = p->audio_output_buffer;
memset(audio_output_buffer, 0, p->file.maximum_audio_sample_size * p->file.maximun_audio_sample_number);
for( i = 0; i < output->number_of_audio_frames; i++ ) {
if ( first_audio_frame+i >= track->stts_sample_count[0] )
break;
p->audio_output_length[i] = track->stsz_sample_size ? track->stsz_sample_size : track->stsz_sample_size_table[first_audio_frame+i];
result = get_audio_sample(p, audio_stream, first_audio_frame+i, &audio_buffer);
if (result != 0) {
return(result);
}
memcpy(audio_output_buffer, audio_buffer, p->audio_output_length[i]);
audio_output_buffer += p->audio_output_length[i];
}
output->first_delay = p->interleaving.output_first_delay;
output->last_delay = p->interleaving.output_last_delay;
output->audio_length = p->audio_output_length;
output->audio_buffer = p->audio_output_buffer;
return(0);
}
int demodulador(ZAP *zap, float *retval)
{
float x,xS,xM;
if (get_audio_sample(zap,&x)) return(-1);
zap->fskd.cola_in[zap->fskd.pcola]=x;
xS=filtroS(zap,x);
xM=filtroM(zap,x);
zap->fskd.cola_filtro[zap->fskd.pcola]=xM-xS;
x=filtroL(zap,xM*xM - xS*xS);
zap->fskd.cola_demod[zap->fskd.pcola++]=x;
zap->fskd.pcola &= (NCOLA-1);
*retval = x;
return(0);
}
int write_audio_frames()
{
int ret = 0;
n_audio_source_sample = n_audio_source_sample_size;
ret = get_audio_sample(p_audio_source,p_audio_source_sample,&n_audio_source_sample);
if(ret < 0)
{
fprintf(stderr ,"avencoder: get_audio_sample fail..\n");
return -1;
}
else if(ret == 0)
{
//fprintf(stderr ,"avencoder: get_audio_sample no audio sample..\n");
n_audio_source_sample = 4608;
memset(p_audio_source_sample,0,n_audio_source_sample);
}
//else if(ret > 0)
// fprintf(stderr ,"avencoder: get_audio_sample yes audio sample..\n");
//printf("n_audio_source_sample = %d\n",n_audio_source_sample);
n_audio_encode_sample = n_audio_encode_sample_size;
ret = encode_audio_sample(p_audio_encoder,p_audio_source_sample,n_audio_source_sample,p_audio_encode_sample,&n_audio_encode_sample);
if(ret < 0)
{
fprintf(stderr ,"avencoder: encode_audio_sample fail..\n");
return -2;
}
//printf("n_audio_encode_sample = %d\n",n_audio_encode_sample);
ret = write_audio_frame(p_avmuxer,p_audio_encode_sample,n_audio_encode_sample);
if(ret < 0)
{
fprintf(stderr ,"avencoder: write_audio_frame fail..\n");
return -3;
}
return 0;
}
