v4l2.c

vlc源码

        return VLC_EGENERIC;
    }

    return VLC_SUCCESS;
}

/*****************************************************************************
 * GetV4L2Params: fill in p_sys parameters (shared by DemuxOpen and AccessOpen)
 *****************************************************************************/
static void GetV4L2Params( demux_sys_t *p_sys, vlc_object_t *p_obj )
{
    p_sys->i_video_pts = -1;

    p_sys->i_selected_standard_id =
        i_standards_list[var_CreateGetInteger( p_obj, "v4l2-standard" )];

    p_sys->i_selected_input = var_CreateGetInteger( p_obj, "v4l2-input" );
    p_sys->i_selected_audio_input =
        var_CreateGetInteger( p_obj, "v4l2-audio-input" );

    p_sys->io = var_CreateGetInteger( p_obj, "v4l2-io" );

    p_sys->i_width = var_CreateGetInteger( p_obj, "v4l2-width" );
    p_sys->i_height = var_CreateGetInteger( p_obj, "v4l2-height" );

    var_CreateGetBool( p_obj, "v4l2-controls-reset" );

    p_sys->f_fps = var_CreateGetFloat( p_obj, "v4l2-fps" );
    p_sys->i_sample_rate = var_CreateGetInteger( p_obj, "v4l2-samplerate" );
    p_sys->psz_requested_chroma = var_CreateGetString( p_obj, "v4l2-chroma" );

    p_sys->i_audio_method = var_CreateGetInteger( p_obj, "v4l2-audio-method" );

    p_sys->b_stereo = var_CreateGetBool( p_obj, "v4l2-stereo" );

    p_sys->i_pts = var_CreateGetInteger( p_obj, "v4l2-caching" );

    p_sys->i_cur_tuner = var_CreateGetInteger( p_obj, "v4l2-tuner" );
    p_sys->i_frequency = var_CreateGetInteger( p_obj, "v4l2-tuner-frequency" );
    p_sys->i_audio_mode = var_CreateGetInteger( p_obj, "v4l2-tuner-audio-mode" );

    p_sys->psz_set_ctrls = var_CreateGetString( p_obj, "v4l2-set-ctrls" );

    p_sys->psz_device = p_sys->psz_vdev = p_sys->psz_adev = NULL;
    p_sys->i_fd_video = -1;
    p_sys->i_fd_audio = -1;

    p_sys->p_es_video = p_sys->p_es_audio = 0;
    p_sys->p_block_audio = 0;
}

/*****************************************************************************
 * ParseMRL: parse the options contained in the MRL
 *****************************************************************************/
static void ParseMRL( demux_sys_t *p_sys, char *psz_path, vlc_object_t *p_obj )
{
    char *psz_dup = strdup( psz_path );
    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, "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 );
                if( !*p_sys->psz_adev )
                {
                    free( p_sys->psz_adev );
                    p_sys->psz_adev = NULL;
                }

                psz_parser += i_len;
            }
            else if( !strncmp( psz_parser, "standard=", strlen( "standard=" ) ) )
            {
                psz_parser += strlen( "standard=" );
                if( !strncmp( psz_parser, "pal", strlen( "pal" ) ) )
                {
                    p_sys->i_selected_standard_id = V4L2_STD_PAL;
                    psz_parser += strlen( "pal" );
                }
                else if( !strncmp( psz_parser, "ntsc", strlen( "ntsc" ) ) )
                {
                    p_sys->i_selected_standard_id = V4L2_STD_NTSC;
                    psz_parser += strlen( "ntsc" );
                }
                else if( !strncmp( psz_parser, "secam", strlen( "secam" ) ) )
                {
                    p_sys->i_selected_standard_id = V4L2_STD_SECAM;
                    psz_parser += strlen( "secam" );
                }
                else if( !strncmp( psz_parser, "default", strlen( "default" ) ) )
                {
                    p_sys->i_selected_standard_id = V4L2_STD_UNKNOWN;
                    psz_parser += strlen( "default" );
                }
                else
                {
                    p_sys->i_selected_standard_id = i_standards_list[strtol( psz_parser, &psz_parser, 0 )];
                }
            }
            else if( !strncmp( psz_parser, "chroma=", strlen( "chroma=" ) ) )
            {
                int  i_len;

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

                free( p_sys->psz_requested_chroma );
                p_sys->psz_requested_chroma = strndup( psz_parser, i_len );

                psz_parser += i_len;
            }
            else if( !strncmp( psz_parser, "input=", strlen( "input=" ) ) )
            {
                p_sys->i_selected_input = strtol( psz_parser + strlen( "input=" ),
                                       &psz_parser, 0 );
            }
            else if( !strncmp( psz_parser, "audio-input=", strlen( "audio-input=" ) ) )
            {
                p_sys->i_selected_audio_input = strtol( psz_parser + strlen( "audio-input=" ),
                                       &psz_parser, 0 );
            }
            else if( !strncmp( psz_parser, "fps=", strlen( "fps=" ) ) )
            {
                p_sys->f_fps = strtof( psz_parser + strlen( "fps=" ),
                                       &psz_parser );
            }
            else if( !strncmp( psz_parser, "io=", strlen( "io=" ) ) )
            {
                psz_parser += strlen( "io=" );
                if( !strncmp( psz_parser, "read", strlen( "read" ) ) )
                {
                    p_sys->io = IO_METHOD_READ;
                    psz_parser += strlen( "read" );
                }
                else if( !strncmp( psz_parser, "mmap", strlen( "mmap" ) ) )
                {
                    p_sys->io = IO_METHOD_MMAP;
                    psz_parser += strlen( "mmap" );
                }
                else if( !strncmp( psz_parser, "userptr", strlen( "userptr" ) ) )
                {
                    p_sys->io = IO_METHOD_USERPTR;
                    psz_parser += strlen( "userptr" );
                }
                else
                {
                    p_sys->io = strtol( psz_parser, &psz_parser, 0 );
                }
            }
            else if( !strncmp( psz_parser, "width=",
                               strlen( "width=" ) ) )
            {
                p_sys->i_width =
                    strtol( psz_parser + strlen( "width=" ),
                            &psz_parser, 0 );
            }
            else if( !strncmp( psz_parser, "height=",
                               strlen( "height=" ) ) )
            {
                p_sys->i_height =
                    strtol( psz_parser + strlen( "height=" ),
                            &psz_parser, 0 );
            }
            else if( !strncmp( psz_parser, "controls-reset",
                               strlen( "controls-reset" ) ) )
            {
                var_SetBool( p_obj, "v4l2-controls-reset", true );
                psz_parser += strlen( "controls-reset" );
            }
#if 0
            else if( !strncmp( psz_parser, "brightness=",
                               strlen( "brightness=" ) ) )
            {
                var_SetInteger( p_obj, "brightness",
                    strtol( psz_parser + strlen( "brightness=" ),
                            &psz_parser, 0 ) );
            }
            else if( !strncmp( psz_parser, "contrast=",
                               strlen( "contrast=" ) ) )
            {
                var_SetInteger( p_obj, "contrast",
                    strtol( psz_parser + strlen( "contrast=" ),
                            &psz_parser, 0 ) );
            }
            else if( !strncmp( psz_parser, "saturation=",
                               strlen( "saturation=" ) ) )
            {
                var_SetInteger( p_obj, "saturation",
                    strtol( psz_parser + strlen( "saturation=" ),
                            &psz_parser, 0 ) );
            }
            else if( !strncmp( psz_parser, "hue=",
                               strlen( "hue=" ) ) )
            {
                var_SetInteger( p_obj, "hue",
                    strtol( psz_parser + strlen( "hue=" ),
                            &psz_parser, 0 ) );
            }
            else if( !strncmp( psz_parser, "gamma=",
                               strlen( "gamma=" ) ) )
            {
                var_SetInteger( p_obj, "gamma",
                    strtol( psz_parser + strlen( "gamma=" ),
                            &psz_parser, 0 ) );
            }
#endif
            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, "audio-method", strlen( "audio-method" ) ) )
            {
                p_sys->i_audio_method =
                    strtol( psz_parser + strlen( "audio-method" ),
                            &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, "caching=", strlen( "caching=" ) ) )
            {
                p_sys->i_pts = strtol( psz_parser + strlen( "caching=" ),
                                       &psz_parser, 0 );
            }
            else if( !strncmp( psz_parser, "tuner=", strlen( "tuner=" ) ) )
            {
                p_sys->i_cur_tuner = strtol( psz_parser + strlen( "tuner=" ),
                                         &psz_parser, 0 );
            }
            else if( !strncmp( psz_parser, "tuner-frequency=", strlen( "tuner-frequency=" ) ) )
            {
                p_sys->i_frequency = strtol( psz_parser
                                          + strlen( "tuner-frequency=" ),
                                          &psz_parser, 0 );
            }
            else if( !strncmp( psz_parser, "tuner-audio-mode=", strlen( "tuner-audio-mode=" ) ) )
            {
                p_sys->i_audio_mode = strtol( psz_parser
                                          + strlen( "tuner-audio-mode=" ),
                                          &psz_parser, 0 );
            }
            else if( !strncmp( psz_parser, "set-ctrls=", strlen( "set-ctrls=" )) )
            {
                int  i_len;

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

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

                psz_parser += i_len;
            }
            else
            {
                char *psz_unk = strchr( psz_parser, ':' );
                if (psz_unk)
                    psz_unk = strndup( psz_parser, psz_unk - psz_parser );
                else
                    psz_unk = strdup( psz_parser);
                msg_Warn( p_obj, "unknown option %s", psz_unk );
                free (psz_unk);
            }

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

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

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

/*****************************************************************************
 * Close: close device, free resources
 *****************************************************************************/
static void AccessClose( vlc_object_t *p_this )
{
    access_t    *p_access = (access_t *)p_this;
    demux_sys_t *p_sys   = (demux_sys_t *) p_access->p_sys;

    CommonClose( p_this, p_sys );
}

static void DemuxClose( vlc_object_t *p_this )
{
    struct v4l2_buffer buf;
    enum v4l2_buf_type buf_type;
    unsigned int i;

    demux_t     *p_demux = (demux_t *)p_this;
    demux_sys_t *p_sys   = p_demux->p_sys;

    /* Stop video capture */
    if( p_sys->i_fd_video >= 0 )
    {
        switch( p_sys->io )
        {
        case IO_METHOD_READ:
            /* Nothing to do */
            break;

        case IO_METHOD_MMAP:
        case IO_METHOD_USERPTR:
            /* Some drivers 'hang' internally if this is not done before streamoff */
            for( unsigned int i = 0; i < p_sys->i_nbuffers; i++ )
            {
                memset( &buf, 0, sizeof(buf) );
                buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
                buf.memory = ( p_sys->io == IO_METHOD_USERPTR ) ?
                    V4L2_MEMORY_USERPTR : V4L2_MEMORY_MMAP;
                v4l2_ioctl( p_sys->i_fd_video, VIDIOC_DQBUF, &buf ); /* ignore result */
            }

            buf_type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
            if( v4l2_ioctl( p_sys->i_fd_video, VIDIOC_STREAMOFF, &buf_type ) < 0 ) {
                msg_Err( p_this, "VIDIOC_STREAMOFF failed" );
            }

            break;