v4l.c

VLC Player Source Code

                }
                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 = true;
            }
            else if( !strncmp( psz_parser, "mono", strlen( "mono" ) ) )
            {
                psz_parser += strlen( "mono" );

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

                p_sys->b_mjpeg = 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_demux, "unknown option" );
            }

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

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

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

/*****************************************************************************
 * OpenVideoDev:
 *****************************************************************************/
static int OpenVideoDev( demux_t *p_demux, char *psz_device )
{
    demux_sys_t *p_sys = p_demux->p_sys;
    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_demux, "cannot open device (%m)" );
        goto vdev_failed;
    }

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

    msg_Dbg( p_demux,
             "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_demux, "invalid channel, falling back on channel 0" );
        p_sys->i_channel = 0;
    }
    if( p_sys->vid_cap.audios && p_sys->i_audio >= p_sys->vid_cap.audios )
    {
        msg_Dbg( p_demux, "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_demux, "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_demux, "invalid height %i", p_sys->i_height );
        p_sys->i_height = 0;
    }

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

    vid_channel.channel = p_sys->i_channel;
    if( ioctl( i_fd, VIDIOCGCHAN, &vid_channel ) < 0 )
    {
        msg_Err( p_demux, "cannot get channel infos (%m)" );
        goto vdev_failed;
    }
    msg_Dbg( p_demux,
             "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_demux, "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_demux, "cannot set channel (%m)" );
        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_demux, "cannot get tuner (%m)" );
                goto vdev_failed;
            }
            msg_Dbg( p_demux, "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_demux, "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_demux, "cannot set tuner (%m)" );
                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_demux, "cannot set frequency (%m)" );
                goto vdev_failed;
            }
            msg_Dbg( p_demux, "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_demux, "cannot get audio (%m)" );
                goto vdev_failed;
            }

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

            if( ioctl( i_fd, VIDIOCSAUDIO, &vid_audio ) < 0 )
            {
                msg_Err( p_demux, "cannot set audio (%m)" );
                goto vdev_failed;
            }
        }

    }

    /* establish basic params with input and norm before feeling width
     * or height */
    if( p_sys->b_mjpeg )
    {
        struct quicktime_mjpeg_app1 *p_app1;
        int32_t i_offset;

        if( ioctl( i_fd, MJPIOC_G_PARAMS, &mjpeg ) < 0 )
        {
            msg_Err( p_demux, "cannot get mjpeg params (%m)" );
            goto vdev_failed;
        }
        mjpeg.input = p_sys->i_channel;
        mjpeg.norm  = p_sys->i_norm;
        mjpeg.decimation = p_sys->i_decimation;

        if( p_sys->i_width )
            mjpeg.img_width = p_sys->i_width / p_sys->i_decimation;
        if( p_sys->i_height )
            mjpeg.img_height = p_sys->i_height / p_sys->i_decimation;

        /* establish Quicktime APP1 marker while we are here */
        mjpeg.APPn = 1;
        mjpeg.APP_len = 40;

        /* aligned */
        p_app1 = (struct quicktime_mjpeg_app1 *)mjpeg.APP_data;
        p_app1->i_reserved = 0;
        p_app1->i_tag = VLC_FOURCC( 'm','j','p','g' );
        p_app1->i_field_size = 0;
        p_app1->i_padded_field_size = 0;
        p_app1->i_next_field = 0;
        /* XXX WARNING XXX */
        /* these's nothing magic about these values.  We are dangerously
         * assuming the encoder card is encoding mjpeg-a and is not throwing
         * in marker tags we aren't expecting.  It's bad enough we have to
         * search through the jpeg output for every frame we grab just to
         * find the first field's end marker, so we take this risk to boost
         * performance.
         * This is really something the driver could do for us because this
         * does conform to standards outside of Apple Quicktime.
         */
        i_offset = 0x2e;
        p_app1->i_DQT_offset = hton32( i_offset );
        i_offset = 0xb4;
        p_app1->i_DHT_offset = hton32( i_offset );
        i_offset = 0x258;
        p_app1->i_SOF_offset = hton32( i_offset );
        i_offset = 0x26b;
        p_app1->i_SOS_offset = hton32( i_offset );
        i_offset = 0x279;
        p_app1->i_data_offset = hton32( i_offset );

        /* SOF and SOS aren't specified by the mjpeg API because they aren't
         * optional.  They will be present in the output. */
        mjpeg.jpeg_markers = JPEG_MARKER_DHT | JPEG_MARKER_DQT;

        if( ioctl( i_fd, MJPIOC_S_PARAMS, &mjpeg ) < 0 )
        {
            msg_Err( p_demux, "cannot set mjpeg params (%m)" );
            goto vdev_failed;
        }

        p_sys->i_width = mjpeg.img_width * mjpeg.HorDcm;
        p_sys->i_height = mjpeg.img_height * mjpeg.VerDcm *
            mjpeg.field_per_buff;
    }

    /* fix width/height */
    if( !p_sys->b_mjpeg && ( p_sys->i_width == 0 || p_sys->i_height == 0 ) )
    {
        struct video_window vid_win;

        if( ioctl( i_fd, VIDIOCGWIN, &vid_win ) < 0 )
        {
            msg_Err( p_demux, "cannot get win (%m)" );
            goto vdev_failed;
        }
        p_sys->i_width  = vid_win.width;
        p_sys->i_height = vid_win.height;

        if( !p_sys->i_width || !p_sys->i_height )
        {
            p_sys->i_width = p_sys->vid_cap.maxwidth;
            p_sys->i_height = p_sys->vid_cap.maxheight;
        }

        if( !p_sys->i_width || !p_sys->i_height )
        {
            msg_Err( p_demux, "invalid video size (%ix%i)",
                     p_sys->i_width, p_sys->i_height );
            goto vdev_failed;
        }

        msg_Dbg( p_demux, "will use %dx%d", p_sys->i_width, p_sys->i_height );
    }

    if( !p_sys->b_mjpeg )
    {
        /* set hue/color/.. */
        if( ioctl( i_fd, VIDIOCGPICT, &p_sys->vid_picture ) == 0 )
        {
            struct video_picture vid_picture = p_sys->vid_picture;

            if( p_sys->i_brightness >= 0 && p_sys->i_brightness < 65536 )
            {
                vid_picture.brightness = p_sys->i_brightness;
            }
            if( p_sys->i_colour >= 0 && p_sys->i_colour < 65536 )
            {
                vid_picture.colour = p_sys->i_colour;
            }
            if( p_sys->i_hue >= 0 && p_sys->i_hue < 65536 )
            {
                vid_picture.hue = p_sys->i_hue;
            }
            if( p_sys->i_contrast  >= 0 && p_sys->i_contrast < 65536 )
            {
                vid_picture.contrast = p_sys->i_contrast;
            }
            if( ioctl( i_fd, VIDIOCSPICT, &vid_picture ) == 0 )
            {
                msg_Dbg( p_demux, "v4l device uses brightness: %d",
                         vid_picture.brightness );
                msg_Dbg( p_demux, "v4l device uses colour: %d",
                         vid_picture.colour );
                msg_Dbg( p_demux, "v4l device uses hue: %d", vid_picture.hue );
                msg_Dbg( p_demux, "v4l device uses contrast: %d",
                         vid_picture.contrast );
                p_sys->vid_picture = vid_picture;
            }
        }

        /* Find out video format used by device */
        if( ioctl( i_fd, VIDIOCGPICT, &p_sys->vid_picture ) == 0 )
        {
            struct video_picture vid_picture = p_sys->vid_picture;
            char *psz;
            int i;

            p_sys->i_fourcc = 0;

            psz = var_CreateGetString( p_demux, "v4l-chroma" );
            if( strlen( psz ) >= 4 )
            {
                vid_picture.palette = 0;
                int i_chroma = VLC_FOURCC( psz[0], psz[1], psz[2], psz[3] );

                /* Find out v4l chroma code */
                for( i = 0; v4lchroma_to_fourcc[i].i_v4l != 0; i++ )
                {
                    if( v4lchroma_to_fourcc[i].i_fourcc == i_chroma )
                    {
                        vid_picture.palette = v4lchroma_to_fourcc[i].i_v4l;
                        break;
                    }
                }
            }
            free( psz );

            if( vid_picture.palette &&
                !ioctl( i_fd, VIDIOCSPICT, &vid_picture ) )