void *VideoStream::StreamingThreadCallback(void *ctx){
Debug( 1, "StreamingThreadCallback started" );
if (ctx == NULL) return NULL;
VideoStream* videoStream = reinterpret_cast<VideoStream*>(ctx);
const uint64_t nanosecond_multiplier = 1000000000;
uint64_t target_interval_ns = nanosecond_multiplier * ( ((double)videoStream->ost->codec->time_base.num) / (videoStream->ost->codec->time_base.den) );
uint64_t frame_count = 0;
timespec start_time;
clock_gettime(CLOCK_MONOTONIC, &start_time);
uint64_t start_time_ns = (start_time.tv_sec*nanosecond_multiplier) + start_time.tv_nsec;
while(videoStream->do_streaming)
{
timespec current_time;
clock_gettime(CLOCK_MONOTONIC, ¤t_time);
uint64_t current_time_ns = (current_time.tv_sec*nanosecond_multiplier) + current_time.tv_nsec;
uint64_t target_ns = start_time_ns + (target_interval_ns * frame_count);
if ( current_time_ns < target_ns )
{
// It's not time to render a frame yet.
usleep( (target_ns - current_time_ns) * 0.001 );
}
// By sending the last rendered frame we deliver frames to the client more accurate.
// If we're encoding the frame before sending it there will be lag.
// Since this lag is not constant the client may skip frames.
// Get the last rendered packet.
AVPacket *packet = videoStream->packet_buffers[videoStream->packet_index];
if (packet->size) {
videoStream->SendPacket(packet);
}
av_free_packet(packet);
videoStream->packet_index = videoStream->packet_index ? 0 : 1;
// Lock buffer and render next frame.
if ( pthread_mutex_lock( videoStream->buffer_copy_lock ) != 0 )
{
Fatal( "StreamingThreadCallback: pthread_mutex_lock failed." );
}
if ( videoStream->buffer_copy )
{
// Encode next frame.
videoStream->ActuallyEncodeFrame( videoStream->buffer_copy, videoStream->buffer_copy_used, videoStream->add_timestamp, videoStream->timestamp );
}
if ( pthread_mutex_unlock( videoStream->buffer_copy_lock ) != 0 )
{
Fatal( "StreamingThreadCallback: pthread_mutex_unlock failed." );
}
frame_count++;
}
return 0;
}
