详解FLV Tag编写过程：与x264编码配合

static int write_frame( hnd_t handle, uint8_t *p_nalu, int i_size, x264_picture_t *p_picture )
{
    flv_hnd_t *p_flv = handle;
    flv_buffer *c = p_flv->c;

    #define convert_timebase_ms( timestamp, timebase ) (int64_t)((timestamp) * (timebase) * 1000 + 0.5)

    if( !p_flv->i_framenum )
    {
        p_flv->i_delay_time = p_picture->i_dts * -1;
        if( !p_flv->b_dts_compress && p_flv->i_delay_time )
            x264_cli_log( "flv", X264_LOG_INFO, "initial delay %"PRId64" ms\n", convert_timebase_ms( p_picture->i_pts + p_flv->i_delay_time, p_flv->d_timebase ) );
    }

    int64_t dts;
    int64_t cts;
    int64_t offset;

    if( p_flv->b_dts_compress )
    {
        if( p_flv->i_framenum == 1 )
            p_flv->i_init_delta = convert_timebase_ms( p_picture->i_dts + p_flv->i_delay_time, p_flv->d_timebase );

        dts = p_flv->i_framenum > p_flv->i_delay_frames 
? convert_timebase_ms( p_picture->i_dts, p_flv->d_timebase ) : p_flv->i_framenum * p_flv->i_init_delta / (p_flv->i_delay_frames + 1);

        cts = convert_timebase_ms( p_picture->i_pts, p_flv->d_timebase );
    }
    else