mux.c

VLC Player Source Code

                   i_aspect_den * (int64_t)codec->width, 1 << 30 );
        codec->time_base.den = p_input->p_fmt->video.i_frame_rate;
        codec->time_base.num = p_input->p_fmt->video.i_frame_rate_base;
        break;

    default:
        msg_Warn( p_mux, "Unhandled ES category" );
    }

    codec->bit_rate = p_input->p_fmt->i_bitrate;
#if LIBAVFORMAT_VERSION_INT >= ((51<<16)+(8<<8)+0)
    codec->codec_tag = av_codec_get_tag( p_sys->oc->oformat->codec_tag, i_codec_id );
    if( !codec->codec_tag && i_codec_id == CODEC_ID_MP2 )
    {
        i_codec_id = CODEC_ID_MP3;
        codec->codec_tag = av_codec_get_tag( p_sys->oc->oformat->codec_tag, i_codec_id );
    }
#else
#   warning "WARNING!!!!!!!"
#   warning "Using libavformat muxing with versions older than 51.8.0 (r7593) might produce broken files."
    /* This is a hack */
    if( i_codec_id == CODEC_ID_MP2 )
        i_codec_id = CODEC_ID_MP3;
    codec->codec_tag = p_input->p_fmt->i_codec;
#endif
    codec->codec_id = i_codec_id;

    if( p_input->p_fmt->i_extra )
    {
        codec->extradata_size = p_input->p_fmt->i_extra;
        codec->extradata = av_malloc( p_input->p_fmt->i_extra );
        memcpy( codec->extradata, p_input->p_fmt->p_extra,
                p_input->p_fmt->i_extra );
    }

    return VLC_SUCCESS;
}

/*****************************************************************************
 * DelStream
 *****************************************************************************/
static int DelStream( sout_mux_t *p_mux, sout_input_t *p_input )
{
    msg_Dbg( p_mux, "removing input" );
    free( p_input->p_sys );
    return VLC_SUCCESS;
}

/*
 * TODO  move this function to src/stream_output.c (used by nearly all muxers)
 */
static int MuxGetStream( sout_mux_t *p_mux, int *pi_stream, mtime_t *pi_dts )
{
    mtime_t i_dts;
    int     i_stream, i;

    for( i = 0, i_dts = 0, i_stream = -1; i < p_mux->i_nb_inputs; i++ )
    {
        block_fifo_t  *p_fifo;

        p_fifo = p_mux->pp_inputs[i]->p_fifo;

        /* We don't really need to have anything in the SPU fifo */
        if( p_mux->pp_inputs[i]->p_fmt->i_cat == SPU_ES &&
            block_FifoCount( p_fifo ) == 0 ) continue;

        if( block_FifoCount( p_fifo ) )
        {
            block_t *p_buf;

            p_buf = block_FifoShow( p_fifo );
            if( i_stream < 0 || p_buf->i_dts < i_dts )
            {
                i_dts = p_buf->i_dts;
                i_stream = i;
            }
        }
        else return -1;

    }
    if( pi_stream ) *pi_stream = i_stream;
    if( pi_dts ) *pi_dts = i_dts;
    if( !p_mux->p_sys->i_initial_dts ) p_mux->p_sys->i_initial_dts = i_dts;
    return i_stream;
}

static int MuxBlock( sout_mux_t *p_mux, sout_input_t *p_input )
{
    sout_mux_sys_t *p_sys = p_mux->p_sys;
    block_t *p_data = block_FifoGet( p_input->p_fifo );
    int i_stream = *((int *)p_input->p_sys);
    AVStream *p_stream = p_sys->oc->streams[i_stream];
    AVPacket pkt;

    memset( &pkt, 0, sizeof(AVPacket) );

    av_init_packet(&pkt);
    pkt.data = p_data->p_buffer;
    pkt.size = p_data->i_buffer;
    pkt.stream_index = i_stream;

    if( p_data->i_flags & BLOCK_FLAG_TYPE_I ) pkt.flags |= PKT_FLAG_KEY;

    /* avformat expects pts/dts which start from 0 */
    p_data->i_dts -= p_mux->p_sys->i_initial_dts;
    p_data->i_pts -= p_mux->p_sys->i_initial_dts;

    if( p_data->i_pts > 0 )
        pkt.pts = p_data->i_pts * p_stream->time_base.den /
            INT64_C(1000000) / p_stream->time_base.num;
    if( p_data->i_dts > 0 )
        pkt.dts = p_data->i_dts * p_stream->time_base.den /
            INT64_C(1000000) / p_stream->time_base.num;

    /* this is another hack to prevent libavformat from triggering the "non monotone timestamps" check in avformat/utils.c */
    p_stream->cur_dts = ( p_data->i_dts * p_stream->time_base.den /
            INT64_C(1000000) / p_stream->time_base.num ) - 1;

    if( av_write_frame( p_sys->oc, &pkt ) < 0 )
    {
        msg_Err( p_mux, "could not write frame (pts: %"PRId64", dts: %"PRId64") "
                 "(pkt pts: %"PRId64", dts: %"PRId64")",
                 p_data->i_pts, p_data->i_dts, pkt.pts, pkt.dts );
        block_Release( p_data );
        return VLC_EGENERIC;
    }

    block_Release( p_data );
    return VLC_SUCCESS;
}

/*****************************************************************************
 * Mux: multiplex available data in input fifos
 *****************************************************************************/
static int Mux( sout_mux_t *p_mux )
{
    sout_mux_sys_t *p_sys = p_mux->p_sys;
    int i_stream;

    if( p_sys->b_error ) return VLC_EGENERIC;

    if( p_sys->b_write_header )
    {
        msg_Dbg( p_mux, "writing header" );

        if( av_write_header( p_sys->oc ) < 0 )
        {
            msg_Err( p_mux, "could not write header" );
            p_sys->b_write_header = false;
            p_sys->b_error = true;
            return VLC_EGENERIC;
        }

#if LIBAVFORMAT_VERSION_INT >= ((52<<16)+(0<<8)+0)
        put_flush_packet( p_sys->oc->pb );
#else
        put_flush_packet( &p_sys->oc->pb );
#endif
        p_sys->b_write_header = false;
    }

    for( ;; )
    {
        if( MuxGetStream( p_mux, &i_stream, 0 ) < 0 ) return VLC_SUCCESS;
        MuxBlock( p_mux, p_mux->pp_inputs[i_stream] );
    }

    return VLC_SUCCESS;
}

/*****************************************************************************
 * Control:
 *****************************************************************************/
static int Control( sout_mux_t *p_mux, int i_query, va_list args )
{
    bool *pb_bool;

    switch( i_query )
    {
    case MUX_CAN_ADD_STREAM_WHILE_MUXING:
        pb_bool = (bool*)va_arg( args, bool * );
        *pb_bool = false;
        return VLC_SUCCESS;

    case MUX_GET_ADD_STREAM_WAIT:
        pb_bool = (bool*)va_arg( args, bool * );
        *pb_bool = true;
        return VLC_SUCCESS;

    case MUX_GET_MIME:
    {
        char **ppsz = (char**)va_arg( args, char ** );
        *ppsz = strdup( p_mux->p_sys->oc->oformat->mime_type );
        return VLC_SUCCESS;
    }

    default:
        return VLC_EGENERIC;
    }
}

/*****************************************************************************
 * I/O wrappers for libavformat
 *****************************************************************************/
static int IOWrite( void *opaque, uint8_t *buf, int buf_size )
{
    URLContext *p_url = opaque;
    sout_mux_t *p_mux = p_url->priv_data;
    int i_ret;

#ifdef AVFORMAT_DEBUG
    msg_Dbg( p_mux, "IOWrite %i bytes", buf_size );
#endif

    block_t *p_buf = block_New( p_mux->p_sout, buf_size );
    if( buf_size > 0 ) memcpy( p_buf->p_buffer, buf, buf_size );

    if( p_mux->p_sys->b_write_header )
        p_buf->i_flags |= BLOCK_FLAG_HEADER;

    i_ret = sout_AccessOutWrite( p_mux->p_access, p_buf );
    return i_ret ? i_ret : -1;
}

static offset_t IOSeek( void *opaque, offset_t offset, int whence )
{
    URLContext *p_url = opaque;
    sout_mux_t *p_mux = p_url->priv_data;
    int64_t i_absolute;

#ifdef AVFORMAT_DEBUG
    msg_Dbg( p_mux, "IOSeek offset: %"PRId64", whence: %i", offset, whence );
#endif

    switch( whence )
    {
    case SEEK_SET:
        i_absolute = offset;
        break;
    case SEEK_CUR:
    case SEEK_END:
    default:
        return -1;
    }

    if( sout_AccessOutSeek( p_mux->p_access, i_absolute ) )
    {
        return -1;
    }

    return 0;
}