plm_demux_get_duration()

double fl::third_party::plm_demux_get_duration	(	plm_demux_t *	self,
		int	type )

Definition at line 1329 of file pl_mpeg.hpp.

                                                                       {
    size_t file_size = plm_buffer_get_size(self->buffer);
 
    if (
        self->duration != PLM_PACKET_INVALID_TS &&
        self->last_file_size == file_size
    ) {
        return self->duration;
    }
 
    size_t previous_pos = plm_buffer_tell(self->buffer);
    int previous_start_code = self->start_code;
    
    // Find last video PTS. Start searching 64kb from the end and go further
    // back if needed.
    long start_range = 64L * 1024L;
    long max_range = 4096L * 1024L;
    for (long range = start_range; range <= max_range; range *= 2) {
        long seek_pos = file_size - range;
        if (seek_pos < 0) {
            seek_pos = 0;
            range = max_range; // Make sure to bail after this round
        }
        plm_demux_buffer_seek(self, seek_pos);
        self->current_packet.length = 0;
 
        double last_pts = PLM_PACKET_INVALID_TS;
        plm_packet_t *packet = NULL;
        while ((packet = plm_demux_decode(self))) {
            if (packet->pts != PLM_PACKET_INVALID_TS && packet->type == type) {
                last_pts = packet->pts;
            }
        }
        if (last_pts != PLM_PACKET_INVALID_TS) {
            self->duration = last_pts - plm_demux_get_start_time(self, type);
            break;
        }
    }
 
    plm_demux_buffer_seek(self, previous_pos);
    self->start_code = previous_start_code;
    self->last_file_size = file_size;
    return self->duration;
}

References FL_NOEXCEPT, NULL, plm_buffer_get_size(), plm_buffer_tell(), plm_demux_buffer_seek(), plm_demux_decode(), plm_demux_get_start_time(), PLM_PACKET_INVALID_TS, fl::third_party::plm_packet_t::pts, and fl::third_party::plm_packet_t::type.

Referenced by plm_demux_seek(), plm_get_duration(), and plm_seek_frame().

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