dv.c

vlc源码

#if 0
    if( !p_access->psz_demux )
    {
        free( p_access->psz_demux );
        p_access->psz_demux = strdup( "rawdv" );
    }
#endif

    vlc_mutex_lock( &p_sys->lock );
    p_block = p_sys->p_frame;
    //msg_Dbg( p_access, "sending frame %p",p_block );
    p_sys->p_frame = NULL;
    vlc_mutex_unlock( &p_sys->lock );

    return p_block;
}

static void* Raw1394EventThread( vlc_object_t *p_this )
{
    event_thread_t *p_ev = (event_thread_t *) p_this;
    access_t *p_access = (access_t *) p_ev->p_access;
    access_sys_t *p_sys = (access_sys_t *) p_access->p_sys;
    int result = 0;

    AVCPlay( p_access, p_sys->i_node );

    vlc_thread_ready( p_this );

    while( vlc_object_alive (p_sys->p_ev) )
    {
        while( ( result = poll( &(p_sys->raw1394_poll), 1, 200 ) ) < 0 )
        {
            if( !( errno == EAGAIN || errno == EINTR ) )
            {
                perror( "error: raw1394 poll" );
                msg_Err( p_access, "retrying device raw1394" );
            }
        }
        if( !vlc_object_alive (p_sys->p_ev) )
                break;
        if( result > 0 && ( ( p_sys->raw1394_poll.revents & POLLIN )
                || ( p_sys->raw1394_poll.revents & POLLPRI ) ) )
            result = raw1394_loop_iterate( p_sys->p_raw1394 );
    }

    AVCStop( p_access, p_sys->i_node );
    return NULL;
}

static int Raw1394Handler( raw1394handle_t handle, int channel, size_t length, quadlet_t *data )
{
    access_t *p_access = NULL;
    access_sys_t *p_sys = NULL;
    block_t *p_block = NULL;

    p_access = (access_t *) raw1394_get_userdata( handle );
    if( !p_access ) return 0;

    p_sys = p_access->p_sys;

    /* skip empty packets */
    if ( length > 16 )
    {
        unsigned char * p = ( unsigned char* ) &data[ 3 ];
        int section_type = p[ 0 ] >> 5;           /* section type is in bits 5 - 7 */
        int dif_sequence = p[ 1 ] >> 4;           /* dif sequence number is in bits 4 - 7 */
        int dif_block = p[ 2 ];

        vlc_mutex_lock( &p_sys->p_ev->lock );

        /* if we are at the beginning of a frame, we put the previous
           frame in our output_queue. */
        if( (section_type == 0) && (dif_sequence == 0) )
        {
            vlc_mutex_lock( &p_sys->lock );
            if( p_sys->p_ev->p_frame )
            {
                /* Push current frame to p_access thread. */
                //p_sys->p_ev->p_frame->i_pts = mdate();
                block_ChainAppend( &p_sys->p_frame, p_sys->p_ev->p_frame );
            }
            /* reset list */
            p_sys->p_ev->p_frame = block_New( p_access, 144000 );
            p_sys->p_ev->pp_last = &p_sys->p_frame;
            vlc_mutex_unlock( &p_sys->lock );
        }

        p_block = p_sys->p_ev->p_frame;
        if( p_block )
        {
            switch ( section_type )
            {
            case 0:    /* 1 Header block */
                /* p[3] |= 0x80; // hack to force PAL data */
                memcpy( p_block->p_buffer + dif_sequence * 150 * 80, p, 480 );
                break;

            case 1:    /* 2 Subcode blocks */
                memcpy( p_block->p_buffer + dif_sequence * 150 * 80 + ( 1 + dif_block ) * 80, p, 480 );
                break;

            case 2:    /* 3 VAUX blocks */
                memcpy( p_block->p_buffer + dif_sequence * 150 * 80 + ( 3 + dif_block ) * 80, p, 480 );
                break;

            case 3:    /* 9 Audio blocks interleaved with video */
                memcpy( p_block->p_buffer + dif_sequence * 150 * 80 + ( 6 + dif_block * 16 ) * 80, p, 480 );
                break;

            case 4:    /* 135 Video blocks interleaved with audio */
                memcpy( p_block->p_buffer + dif_sequence * 150 * 80 + ( 7 + ( dif_block / 15 ) + dif_block ) * 80, p, 480 );
                break;

            default:    /* we can´t handle any other data */
                block_Release( p_block );
                p_block = NULL;
                break;
            }
        }
        vlc_mutex_unlock( &p_sys->p_ev->lock );
    }
    return 0;
}

/*
 * Routing borrowed from dvgrab-1.8
 * Copyright by Arne Schirmacher <[e-mail]>
 * Dan Dennedy <[e-mail]> and others
 */
static int Raw1394GetNumPorts( access_t *p_access )
{
    int n_ports;
    struct raw1394_portinfo pinf[ 16 ];
    raw1394handle_t handle;

    /* get a raw1394 handle */
    if ( !( handle = raw1394_new_handle() ) )
    {
        msg_Err( p_access, "raw1394 - failed to get handle: %m." );
        return VLC_EGENERIC;
    }

    if ( ( n_ports = raw1394_get_port_info( handle, pinf, 16 ) ) < 0 )
    {
        msg_Err( p_access, "raw1394 - failed to get port info: %m.\n" );
        raw1394_destroy_handle( handle );
        return VLC_EGENERIC;
    }
    raw1394_destroy_handle( handle );

    return n_ports;
}

static raw1394handle_t Raw1394Open( access_t *p_access, int port )
{
    int n_ports;
    struct raw1394_portinfo pinf[ 16 ];
    raw1394handle_t handle;

    /* get a raw1394 handle */
#ifdef RAW1394_V_0_8

    handle = raw1394_get_handle();
#else

    handle = raw1394_new_handle();
#endif

    if ( !handle )
    {
        msg_Err( p_access, "raw1394 - failed to get handle: %m." );
        return NULL;
    }

    if ( ( n_ports = raw1394_get_port_info( handle, pinf, 16 ) ) < 0 )
    {
        msg_Err( p_access, "raw1394 - failed to get port info: %m." );
        raw1394_destroy_handle( handle );
        return NULL;
    }

    /* tell raw1394 which host adapter to use */
    if ( raw1394_set_port( handle, port ) < 0 )
    {
        msg_Err( p_access, "raw1394 - failed to set set port: %m." );
        return NULL;
    }

    return handle;
}

static void Raw1394Close( raw1394handle_t handle )
{
    raw1394_destroy_handle( handle );
}

static int DiscoverAVC( access_t *p_access, int* port, uint64_t guid )
{
    rom1394_directory rom_dir;
    raw1394handle_t handle = NULL;
    int device = -1;
    int i, j = 0;
    int m = Raw1394GetNumPorts( p_access );

    if( *port >= 0 )
    {
        /* search on explicit port */
        j = *port;
        m = *port + 1;
    }

    for( ; j < m && device == -1; j++ )
    {
        handle = Raw1394Open( p_access, j );
        if( !handle )
            return -1;

        for( i = 0; i < raw1394_get_nodecount( handle ); ++i )
        {
            if( guid != 0 )
            {
                /* select explicitly by GUID */
                if( guid == rom1394_get_guid( handle, i ) )
                {
                    device = i;
                    *port = j;
                    break;
                }
            }
            else
            {
                /* select first AV/C Tape Reccorder Player node */
                if( rom1394_get_directory( handle, i, &rom_dir ) < 0 )
                {
                    msg_Err( p_access, "error reading config rom directory for node %d\n", i );
                    continue;
                }
                if( ( rom1394_get_node_type( &rom_dir ) == ROM1394_NODE_TYPE_AVC ) &&
                        avc1394_check_subunit_type( handle, i, AVC1394_SUBUNIT_TYPE_VCR ) )
                {
                    device = i;
                    *port = j;
                    break;
                }
            }
        }
        Raw1394Close( handle );
    }

    return device;
}

/*
 * Handle AVC commands
 */
static raw1394handle_t AVCOpen( access_t *p_access, int port )
{
    access_sys_t *p_sys = p_access->p_sys;
    int numcards;
    struct raw1394_portinfo pinf[ 16 ];

    p_sys->p_avc1394 = raw1394_new_handle();
    if( !p_sys->p_avc1394 )
        return NULL;

    numcards = raw1394_get_port_info( p_sys->p_avc1394, pinf, 16 );
    if( numcards < -1 )
        return NULL;
    if( raw1394_set_port( p_sys->p_avc1394, port ) < 0 )
        return NULL;

    raw1394_set_bus_reset_handler( p_sys->p_avc1394, AVCResetHandler );

    return  p_sys->p_avc1394;
}

static void AVCClose( access_t *p_access )
{
    access_sys_t *p_sys = p_access->p_sys;

    if( p_sys->p_avc1394 )
    {
        raw1394_destroy_handle( p_sys->p_avc1394 );
        p_sys->p_avc1394 = NULL;
    }
}


static int AVCResetHandler( raw1394handle_t handle, unsigned int generation )
{
    raw1394_update_generation( handle, generation );
    return 0;
}

static int AVCPlay( access_t *p_access, int phyID )
{
    access_sys_t *p_sys = p_access->p_sys;

    msg_Dbg( p_access, "send play command over Digital Video control channel" );
    if( !p_sys->p_avc1394 )
        return 0;

    if( phyID >= 0 )
    {
        if( !avc1394_vcr_is_recording( p_sys->p_avc1394, phyID ) &&
            avc1394_vcr_is_playing( p_sys->p_avc1394, phyID ) != AVC1394_VCR_OPERAND_PLAY_FORWARD )
                avc1394_vcr_play( p_sys->p_avc1394, phyID );
    }
    return 0;
}

static int AVCPause( access_t *p_access, int phyID )
{
    access_sys_t *p_sys = p_access->p_sys;

    if( !p_sys->p_avc1394 )
        return 0;

    if( phyID >= 0 )
    {
        if( !avc1394_vcr_is_recording( p_sys->p_avc1394, phyID ) &&
            ( avc1394_vcr_is_playing( p_sys->p_avc1394, phyID ) != AVC1394_VCR_OPERAND_PLAY_FORWARD_PAUSE ) )
                avc1394_vcr_pause( p_sys->p_avc1394, phyID );
    }
    return 0;
}


static int AVCStop( access_t *p_access, int phyID )
{
    access_sys_t *p_sys = p_access->p_sys;

    msg_Dbg( p_access, "closing Digital Video control channel" );
    if( !p_sys->p_avc1394 )
        return 0;

    if ( phyID >= 0 )
        avc1394_vcr_stop( p_sys->p_avc1394, phyID );

    return 0;
}