demux.c

video linux conference

    return VLC_SUCCESS;
}

/*****************************************************************************
 * Close
 *****************************************************************************/
void E_(CloseDemux)( vlc_object_t *p_this )
{
    demux_t     *p_demux = (demux_t*)p_this;
    demux_sys_t *p_sys = p_demux->p_sys;

    if( p_sys->ic ) av_close_input_file( p_sys->ic );
    if( p_sys->io_buffer ) free( p_sys->io_buffer );
    free( p_sys );
}

/*****************************************************************************
 * Demux:
 *****************************************************************************/
static int Demux( demux_t *p_demux )
{
    demux_sys_t *p_sys = p_demux->p_sys;
    AVPacket    pkt;
    block_t     *p_frame;
    int64_t     i_start_time;

    /* Read a frame */
    if( av_read_frame( p_sys->ic, &pkt ) )
    {
        return 0;
    }
    if( pkt.stream_index < 0 || pkt.stream_index >= p_sys->i_tk )
    {
        av_free_packet( &pkt );
        return 1;
    }
    if( ( p_frame = block_New( p_demux, pkt.size ) ) == NULL )
    {
        return 0;
    }

    memcpy( p_frame->p_buffer, pkt.data, pkt.size );

    i_start_time = ( p_sys->ic->start_time != AV_NOPTS_VALUE ) ?
        p_sys->ic->start_time : 0;

    p_frame->i_dts = ( pkt.dts == AV_NOPTS_VALUE ) ?
        0 : (pkt.dts - i_start_time) * 1000000 / AV_TIME_BASE;
    p_frame->i_pts = ( pkt.pts == AV_NOPTS_VALUE ) ?
        0 : (pkt.pts - i_start_time) * 1000000 / AV_TIME_BASE;

#ifdef AVFORMAT_DEBUG
    msg_Dbg( p_demux, "tk[%d] dts="I64Fd" pts="I64Fd,
             pkt.stream_index, p_frame->i_dts, p_frame->i_pts );
#endif

    if( pkt.dts > 0  &&
        ( pkt.stream_index == p_sys->i_pcr_tk || p_sys->i_pcr_tk < 0 ) )
    {    
        p_sys->i_pcr_tk = pkt.stream_index;
        p_sys->i_pcr = pkt.dts - i_start_time;

        es_out_Control( p_demux->out, ES_OUT_SET_PCR, (int64_t)p_sys->i_pcr );
    }

    es_out_Send( p_demux->out, p_sys->tk[pkt.stream_index], p_frame );
    av_free_packet( &pkt );
    return 1;
}

/*****************************************************************************
 * Control:
 *****************************************************************************/
static int Control( demux_t *p_demux, int i_query, va_list args )
{
    demux_sys_t *p_sys = p_demux->p_sys;
    double f, *pf;
    int64_t i64, *pi64;

    switch( i_query )
    {
        case DEMUX_GET_POSITION:
            pf = (double*) va_arg( args, double* ); *pf = 0.0;
            i64 = stream_Size( p_demux->s );
            if( i64 > 0 )
            {
                *pf = (double)stream_Tell( p_demux->s ) / (double)i64;
            }

            if( p_sys->ic->duration != AV_NOPTS_VALUE && p_sys->i_pcr > 0 )
            {
                *pf = (double)p_sys->i_pcr / (double)p_sys->ic->duration;
            }

            return VLC_SUCCESS;

        case DEMUX_SET_POSITION:
            f = (double) va_arg( args, double );
            i64 = stream_Tell( p_demux->s );
            if( i64 && p_sys->i_pcr > 0 )
            {
                int64_t i_size = stream_Size( p_demux->s );

                i64 = p_sys->i_pcr * i_size / i64 * f;
                if( p_sys->ic->start_time != AV_NOPTS_VALUE )
                    i64 += p_sys->ic->start_time;

                if( p_sys->ic->duration != AV_NOPTS_VALUE )
                    i64 = p_sys->ic->duration * f;

                msg_Warn( p_demux, "DEMUX_SET_POSITION: "I64Fd, i64 );

                if( av_seek_frame( p_sys->ic, -1, i64, 0 ) < 0 )
                {
                    return VLC_EGENERIC;
                }
                es_out_Control( p_demux->out, ES_OUT_RESET_PCR );
                p_sys->i_pcr = -1; /* Invalidate time display */
            }
            return VLC_SUCCESS;

        case DEMUX_GET_LENGTH:
            pi64 = (int64_t*)va_arg( args, int64_t * );
            if( p_sys->ic->duration != AV_NOPTS_VALUE )
            {
                *pi64 = p_sys->ic->duration;
            }
            else *pi64 = 0;
            return VLC_SUCCESS;

        case DEMUX_GET_TIME:
            pi64 = (int64_t*)va_arg( args, int64_t * );
            *pi64 = p_sys->i_pcr;
            return VLC_SUCCESS;

        case DEMUX_SET_TIME:
            i64 = (int64_t)va_arg( args, int64_t );
            if( p_sys->ic->start_time != AV_NOPTS_VALUE )
                i64 += p_sys->ic->start_time;

            msg_Warn( p_demux, "DEMUX_SET_TIME: "I64Fd, i64 );

            if( av_seek_frame( p_sys->ic, -1, i64, 0 ) < 0 )
            {
                return VLC_EGENERIC;
            }
            es_out_Control( p_demux->out, ES_OUT_RESET_PCR );
            p_sys->i_pcr = -1; /* Invalidate time display */
            return VLC_SUCCESS;

        case DEMUX_GET_META:
        {
            vlc_meta_t **pp_meta = (vlc_meta_t**)va_arg( args, vlc_meta_t** );
            vlc_meta_t *meta;

            if( !p_sys->ic->title[0] || !p_sys->ic->author[0] ||
                !p_sys->ic->copyright[0] || !p_sys->ic->comment[0] ||
                /*!p_sys->ic->album[0] ||*/ !p_sys->ic->genre[0] )
            {
                return VLC_EGENERIC;
            }

            *pp_meta = meta = vlc_meta_New();

            if( p_sys->ic->title[0] )
                vlc_meta_Add( meta, VLC_META_TITLE, p_sys->ic->title );
            if( p_sys->ic->author[0] )
                vlc_meta_Add( meta, VLC_META_AUTHOR, p_sys->ic->author );
            if( p_sys->ic->copyright[0] )
                vlc_meta_Add( meta, VLC_META_COPYRIGHT, p_sys->ic->copyright );
            if( p_sys->ic->comment[0] )
                vlc_meta_Add( meta, VLC_META_DESCRIPTION, p_sys->ic->comment );
            if( p_sys->ic->genre[0] )
                vlc_meta_Add( meta, VLC_META_GENRE, p_sys->ic->genre );
            return VLC_SUCCESS;
        }

        default:
            return VLC_EGENERIC;
    }
}

/*****************************************************************************
 * I/O wrappers for libavformat
 *****************************************************************************/
static int IORead( void *opaque, uint8_t *buf, int buf_size )
{
    URLContext *p_url = opaque;
    demux_t *p_demux = p_url->priv_data;
    int i_ret = stream_Read( p_demux->s, buf, buf_size );
    return i_ret ? i_ret : -1;
}

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

#ifdef AVFORMAT_DEBUG
    msg_Warn( p_demux, "IOSeek offset: "I64Fd", whence: %i", offset, whence );
#endif

    switch( whence )
    {
        case SEEK_SET:
            i_absolute = offset;
            break;
        case SEEK_CUR:
            i_absolute = stream_Tell( p_demux->s ) + offset;
            break;
        case SEEK_END:
            i_absolute = stream_Size( p_demux->s ) - offset;
            break;
        default:
            return -1;

    }

    if( stream_Seek( p_demux->s, i_absolute ) )
    {
        return -1;
    }

    return 0;
}

#else /* LIBAVFORMAT_BUILD >= 4611 */

int E_(OpenDemux)( vlc_object_t *p_this )
{
    return VLC_EGENERIC;
}

void E_(CloseDemux)( vlc_object_t *p_this )
{
}

#endif /* LIBAVFORMAT_BUILD >= 4611 */