v4l.c

VLC媒体播放程序

    memcpy( p_sys->p_header, ".v4l", 4 );

    if( p_sys->fd_video >= 0 )
    {
        p_sys->i_header_size += 20;
        p_sys->p_header = realloc( p_sys->p_header, p_sys->i_header_size );

        SetDWBE( &p_sys->p_header[4], ++p_sys->i_streams );

        memcpy(  &p_sys->p_header[p_sys->i_header_pos], "vids", 4 );
        memcpy(  &p_sys->p_header[p_sys->i_header_pos+4],
                 &p_sys->i_fourcc, 4 );
        SetDWBE( &p_sys->p_header[p_sys->i_header_pos+8], p_sys->i_width );
        SetDWBE( &p_sys->p_header[p_sys->i_header_pos+12], p_sys->i_height );
        SetDWBE( &p_sys->p_header[p_sys->i_header_pos+16], 0 );

        p_sys->i_header_pos = p_sys->i_header_size;
    }

    if( p_sys->fd_audio >= 0 )
    {
        p_sys->i_header_size += 20;
        p_sys->p_header = realloc( p_sys->p_header, p_sys->i_header_size );

        SetDWBE( &p_sys->p_header[4], ++p_sys->i_streams );

        memcpy(  &p_sys->p_header[p_sys->i_header_pos], "auds", 4 );
        memcpy(  &p_sys->p_header[p_sys->i_header_pos+4], "araw", 4 );
        SetDWBE( &p_sys->p_header[p_sys->i_header_pos+8],
                 p_sys->b_stereo ? 2 : 1 );
        SetDWBE( &p_sys->p_header[p_sys->i_header_pos+12],
                 p_sys->i_sample_rate );
        SetDWBE( &p_sys->p_header[p_sys->i_header_pos+16], 16 );

        p_sys->i_header_pos = p_sys->i_header_size;
    }
    p_sys->i_header_pos = 0;

    return VLC_SUCCESS;
}

/*****************************************************************************
 * ParseMRL: parse the options contained in the MRL
 *****************************************************************************/
static void ParseMRL( input_thread_t *p_input )
{
    access_sys_t *p_sys = p_input->p_access_data;

    char *psz_dup = strdup( p_input->psz_name );
    char *psz_parser = psz_dup;

    while( *psz_parser && *psz_parser != ':' )
    {
        psz_parser++;
    }

    if( *psz_parser == ':' )
    {
        /* read options */
        for( ;; )
        {
            *psz_parser++ = '\0';
            if( !strncmp( psz_parser, "channel=", strlen( "channel=" ) ) )
            {
                p_sys->i_channel = strtol( psz_parser + strlen( "channel=" ),
                                           &psz_parser, 0 );
            }
            else if( !strncmp( psz_parser, "norm=", strlen( "norm=" ) ) )
            {
                psz_parser += strlen( "norm=" );
                if( !strncmp( psz_parser, "pal", strlen( "pal" ) ) )
                {
                    p_sys->i_norm = VIDEO_MODE_PAL;
                    psz_parser += strlen( "pal" );
                }
                else if( !strncmp( psz_parser, "ntsc", strlen( "ntsc" ) ) )
                {
                    p_sys->i_norm = VIDEO_MODE_NTSC;
                    psz_parser += strlen( "ntsc" );
                }
                else if( !strncmp( psz_parser, "secam", strlen( "secam" ) ) )
                {
                    p_sys->i_norm = VIDEO_MODE_SECAM;
                    psz_parser += strlen( "secam" );
                }
                else if( !strncmp( psz_parser, "auto", strlen( "auto" ) ) )
                {
                    p_sys->i_norm = VIDEO_MODE_AUTO;
                    psz_parser += strlen( "auto" );
                }
                else
                {
                    p_sys->i_norm = strtol( psz_parser, &psz_parser, 0 );
                }
            }
            else if( !strncmp( psz_parser, "frequency=",
                               strlen( "frequency=" ) ) )
            {
                p_sys->i_frequency =
                    strtol( psz_parser + strlen( "frequency=" ),
                            &psz_parser, 0 );
                if( p_sys->i_frequency < 30000 )
                {
                    msg_Warn( p_input, "v4l syntax has changed : "
                              "'frequency' is now channel frequency in kHz");
                }
            }
            else if( !strncmp( psz_parser, "audio=", strlen( "audio=" ) ) )
            {
                p_sys->i_audio = strtol( psz_parser + strlen( "audio=" ),
                                         &psz_parser, 0 );
            }
            else if( !strncmp( psz_parser, "size=", strlen( "size=" ) ) )
            {
                psz_parser += strlen( "size=" );
                if( !strncmp( psz_parser, "subqcif", strlen( "subqcif" ) ) )
                {
                    p_sys->i_width  = 128;
                    p_sys->i_height = 96;
                }
                else if( !strncmp( psz_parser, "qsif", strlen( "qsif" ) ) )
                {
                    p_sys->i_width  = 160;
                    p_sys->i_height = 120;
                }
                else if( !strncmp( psz_parser, "qcif", strlen( "qcif" ) ) )
                {
                    p_sys->i_width  = 176;
                    p_sys->i_height = 144;
                }
                else if( !strncmp( psz_parser, "sif", strlen( "sif" ) ) )
                {
                    p_sys->i_width  = 320;
                    p_sys->i_height = 244;
                }
                else if( !strncmp( psz_parser, "cif", strlen( "cif" ) ) )
                {
                    p_sys->i_width  = 352;
                    p_sys->i_height = 288;
                }
                else if( !strncmp( psz_parser, "vga", strlen( "vga" ) ) )
                {
                    p_sys->i_width  = 640;
                    p_sys->i_height = 480;
                }
                else
                {
                    /* widthxheight */
                    p_sys->i_width = strtol( psz_parser, &psz_parser, 0 );
                    if( *psz_parser == 'x' || *psz_parser == 'X')
                    {
                        p_sys->i_height = strtol( psz_parser + 1,
                                                  &psz_parser, 0 );
                    }
                    msg_Dbg( p_input, "WxH %dx%d", p_sys->i_width,
                             p_sys->i_height );
                }
            }
            else if( !strncmp( psz_parser, "brightness=", strlen( "brightness=" ) ) )
            {
                p_sys->i_brightness = strtol( psz_parser + strlen( "brightness=" ),
                                              &psz_parser, 0 );
            }
            else if( !strncmp( psz_parser, "colour=", strlen( "colour=" ) ) )
            {
                p_sys->i_colour = strtol( psz_parser + strlen( "colour=" ),
                                          &psz_parser, 0 );
            }
            else if( !strncmp( psz_parser, "hue=", strlen( "hue=" ) ) )
            {
                p_sys->i_hue = strtol( psz_parser + strlen( "hue=" ), 
                                       &psz_parser, 0 );
            }
            else if( !strncmp( psz_parser, "contrast=", strlen( "contrast=" ) ) )
            {
                p_sys->i_contrast = strtol( psz_parser + strlen( "contrast=" ),
                                            &psz_parser, 0 );
            }
            else if( !strncmp( psz_parser, "tuner=", strlen( "tuner=" ) ) )
            {
                p_sys->i_tuner = strtol( psz_parser + strlen( "tuner=" ),
                                         &psz_parser, 0 );
            }
            else if( !strncmp( psz_parser, "adev=", strlen( "adev=" ) ) )
            {
                int  i_len;

                psz_parser += strlen( "adev=" );
                if( strchr( psz_parser, ':' ) )
                {
                    i_len = strchr( psz_parser, ':' ) - psz_parser;
                }
                else
                {
                    i_len = strlen( psz_parser );
                }

                p_sys->psz_adev = strndup( psz_parser, i_len );

                psz_parser += i_len;
            }
            else if( !strncmp( psz_parser, "samplerate=",
                               strlen( "samplerate=" ) ) )
            {
                p_sys->i_sample_rate =
                    strtol( psz_parser + strlen( "samplerate=" ),
                            &psz_parser, 0 );
            }
            else if( !strncmp( psz_parser, "stereo", strlen( "stereo" ) ) )
            {
                psz_parser += strlen( "stereo" );

                p_sys->b_stereo = VLC_TRUE;
            }
            else if( !strncmp( psz_parser, "mono", strlen( "mono" ) ) )
            {
                psz_parser += strlen( "mono" );

                p_sys->b_stereo = VLC_FALSE;
            }
            else if( !strncmp( psz_parser, "mjpeg", strlen( "mjpeg" ) ) )
            {
                psz_parser += strlen( "mjpeg" );

                p_sys->b_mjpeg = VLC_TRUE;
            }
            else if( !strncmp( psz_parser, "decimation=",
                        strlen( "decimation=" ) ) )
            {
                p_sys->i_decimation =
                    strtol( psz_parser + strlen( "decimation=" ),
                            &psz_parser, 0 );
            }
            else if( !strncmp( psz_parser, "quality=",
                        strlen( "quality=" ) ) )
            {
                p_sys->i_quality =
                    strtol( psz_parser + strlen( "quality=" ),
                            &psz_parser, 0 );
            }
            else if( !strncmp( psz_parser, "fps=", strlen( "fps=" ) ) )
            {
                p_sys->f_fps = strtof( psz_parser + strlen( "fps=" ),
                                       &psz_parser );
            }
            else
            {
                msg_Warn( p_input, "unknown option" );
            }

            while( *psz_parser && *psz_parser != ':' )
            {
                psz_parser++;
            }

            if( *psz_parser == '\0' )
            {
                break;
            }
        }
    }

    if( *psz_dup )
    {
        p_sys->psz_device = strdup( psz_dup );
    }
    if( psz_dup ) free( psz_dup );
}

/*****************************************************************************
 * OpenVideoDev:
 *****************************************************************************/
int OpenVideoDev( input_thread_t *p_input, char *psz_device )
{
    access_sys_t *p_sys = p_input->p_access_data;
    int i_fd;

    struct video_channel vid_channel;
    struct mjpeg_params mjpeg;
    int i;

    if( ( i_fd = open( psz_device, O_RDWR ) ) < 0 )
    {
        msg_Err( p_input, "cannot open device (%s)", strerror( errno ) );
        goto vdev_failed;
    }

    if( ioctl( i_fd, VIDIOCGCAP, &p_sys->vid_cap ) < 0 )
    {
        msg_Err( p_input, "cannot get capabilities (%s)", strerror( errno ) );
        goto vdev_failed;
    }

    msg_Dbg( p_input,
             "V4L device %s %d channels %d audios %d < w < %d %d < h < %d",
             p_sys->vid_cap.name,
             p_sys->vid_cap.channels,
             p_sys->vid_cap.audios,
             p_sys->vid_cap.minwidth,  p_sys->vid_cap.maxwidth,
             p_sys->vid_cap.minheight, p_sys->vid_cap.maxheight );

    if( p_sys->i_channel < 0 || p_sys->i_channel >= p_sys->vid_cap.channels )
    {
        msg_Dbg( p_input, "invalid channel, falling back on channel 0" );
        p_sys->i_channel = 0;
    }
    if( p_sys->i_audio >= p_sys->vid_cap.audios )
    {
        msg_Dbg( p_input, "invalid audio, falling back with no audio" );
        p_sys->i_audio = -1;
    }

    if( p_sys->i_width < p_sys->vid_cap.minwidth ||
        p_sys->i_width > p_sys->vid_cap.maxwidth )
    {
        msg_Dbg( p_input, "invalid width %i", p_sys->i_width );
        p_sys->i_width = 0;
    }
    if( p_sys->i_height < p_sys->vid_cap.minheight ||
        p_sys->i_height > p_sys->vid_cap.maxheight )
    {
        msg_Dbg( p_input, "invalid height %i", p_sys->i_height );
        p_sys->i_height = 0;
    }

    if( !( p_sys->vid_cap.type & VID_TYPE_CAPTURE ) )
    {
        msg_Err( p_input, "cannot grab" );
        goto vdev_failed;
    }

    vid_channel.channel = p_sys->i_channel;
    if( ioctl( i_fd, VIDIOCGCHAN, &vid_channel ) < 0 )
    {
        msg_Err( p_input, "cannot get channel infos (%s)",
                          strerror( errno ) );
        goto vdev_failed;
    }
    msg_Dbg( p_input,
             "setting channel %s(%d) %d tuners flags=0x%x type=0x%x norm=0x%x",
             vid_channel.name,
             vid_channel.channel,
             vid_channel.tuners,
             vid_channel.flags,
             vid_channel.type,
             vid_channel.norm );

    if( p_sys->i_tuner >= vid_channel.tuners )
    {
        msg_Dbg( p_input, "invalid tuner, falling back on tuner 0" );
        p_sys->i_tuner = 0;
    }

    vid_channel.norm = p_sys->i_norm;
    if( ioctl( i_fd, VIDIOCSCHAN, &vid_channel ) < 0 )
    {
        msg_Err( p_input, "cannot set channel (%s)", strerror( errno ) );
        goto vdev_failed;
    }

    if( vid_channel.flags & VIDEO_VC_TUNER )
    {

        /* set tuner */
#if 0
        struct video_tuner vid_tuner;
        if( p_sys->i_tuner >= 0 )
        {
            vid_tuner.tuner = p_sys->i_tuner;
            if( ioctl( i_fd, VIDIOCGTUNER, &vid_tuner ) < 0 )
            {
                msg_Err( p_input, "cannot get tuner (%s)", strerror( errno ) );
                goto vdev_failed;
            }
            msg_Dbg( p_input, "tuner %s low=%d high=%d, flags=0x%x "
                     "mode=0x%x signal=0x%x",
                     vid_tuner.name, vid_tuner.rangelow, vid_tuner.rangehigh,
                     vid_tuner.flags, vid_tuner.mode, vid_tuner.signal );

            msg_Dbg( p_input, "setting tuner %s (%d)",
                     vid_tuner.name, vid_tuner.tuner );

            /* FIXME FIXME to be checked FIXME FIXME */
            //vid_tuner.mode = p_sys->i_norm;
            if( ioctl( i_fd, VIDIOCSTUNER, &vid_tuner ) < 0 )
            {
                msg_Err( p_input, "cannot set tuner (%s)", strerror( errno ) );
                goto vdev_failed;
            }
        }
#endif

        /* Show a warning if frequency is < than 30000.
         * User is certainly usint old syntax. */


        /* set frequency */
        if( p_sys->i_frequency >= 0 )
        {
            int driver_frequency = p_sys->i_frequency * 16 /1000;
            if( ioctl( i_fd, VIDIOCSFREQ, &driver_frequency ) < 0 )
            {
                msg_Err( p_input, "cannot set frequency (%s)",
                                  strerror( errno ) );
                goto vdev_failed;
            }
            msg_Dbg( p_input, "frequency %d (%d)", p_sys->i_frequency,
                                                   driver_frequency );
        }
    }

    /* set audio */
    if( vid_channel.flags & VIDEO_VC_AUDIO )
    {
        struct video_audio      vid_audio;

        /* XXX TODO volume, balance, ... */
        if( p_sys->i_audio >= 0 )
        {
            vid_audio.audio = p_sys->i_audio;
            if( ioctl( i_fd, VIDIOCGAUDIO, &vid_audio ) < 0 )
            {
                msg_Err( p_input, "cannot get audio (%s)", strerror( errno ) );
                goto vdev_failed;
            }

            /* unmute audio */
            vid_audio.flags &= ~VIDEO_AUDIO_MUTE;