pvr.c

来自「VLC媒体播放程序」· C语言 代码 · 共 516 行 · 第 1/2 页

            else if( !strncmp( psz_parser, "size=",
                               strlen( "size=" ) ) )
            {
                p_sys->i_width =
                    strtol( psz_parser + strlen( "size=" ),
                            &psz_parser, 0 );
                p_sys->i_height =
                    strtol( psz_parser + 1 ,
                            &psz_parser, 0 );

            }
            else 
            {
                char *psz_parser_init;
                psz_parser_init = psz_parser;
                while ( *psz_parser != ':' && *psz_parser != ',' && *psz_parser != '\0' )
                {
                    psz_parser++;
                }
                psz_device = calloc( psz_parser - psz_parser_init + 1, 1 );
                strncpy( psz_device, psz_parser_init, psz_parser - psz_parser_init );
            }
            if( *psz_parser )
                psz_parser++;
            else
                break;
        }
    }

    //give a default value to psz_device if none has bee specified

    if (!psz_device)
    {
        psz_device = calloc( strlen( "/dev/videox" ) + 1, 1 );
        strcpy( psz_device, "/dev/video0" );
    }

    free( psz_tofree );

    /* open the device */
    if( ( p_sys->i_fd = open( psz_device, O_RDWR ) ) < 0 )
    {
        msg_Err( p_input, "cannot open device (%s)", strerror( errno ) );
        return VLC_EGENERIC;
    }
    else
    {
        msg_Dbg( p_input, "using video device: %s",psz_device);
    }

    free( psz_device );
    
    /* set the input */
    if( p_sys->i_input != -1)
    {
	    if(ioctl( p_sys->i_fd, VIDIOC_S_INPUT, &p_sys->i_input ) < 0 )
	    {
	        msg_Warn( p_input, "VIDIOC_S_INPUT failed" );
	    }
	    else
        {
	        msg_Dbg( p_input,"input set to:%d",p_sys->i_input);
        }
    }
      
      /* set the video standard */
    if(p_sys->i_standard != V4L2_STD_UNKNOWN)
	{
	    if(ioctl( p_sys->i_fd, VIDIOC_S_STD, &p_sys->i_standard ) < 0 )
	    {
	        msg_Warn( p_input, "VIDIOC_S_STD failed" );
	    }
	    else
        {
	        msg_Dbg( p_input,"video standard set to:%x",p_sys->i_standard);
        }
	}

      /* set the picture size */
    if(p_sys->i_width != -1 || p_sys->i_height != -1)
	{
	    if(ioctl( p_sys->i_fd, VIDIOC_G_FMT, &vfmt ) < 0 )
	    {
	        msg_Warn( p_input, "VIDIOC_G_FMT failed" );
	    }
	    else
	    {
	        if(p_sys->i_width != -1)
            {
		        vfmt.fmt.pix.width = p_sys->i_width;
            }
	      
	        if(p_sys->i_height != -1)
            {
		        vfmt.fmt.pix.height = p_sys->i_height;
	        }

	        if( ioctl( p_sys->i_fd, VIDIOC_S_FMT, &vfmt ) < 0 )
		    {
		        msg_Warn( p_input, "VIDIOC_S_FMT failed" );
		    }
	        else
		    {
		        msg_Dbg( p_input,"picture size set to:%dx%d",vfmt.fmt.pix.width, vfmt.fmt.pix.height);
		    }
	    }
	}

      /* set the frequency */
    if (p_sys->i_frequency != -1) 
	{
	    vf.tuner = 0; /* TODO: let the user choose the tuner */
	    if( ioctl( p_sys->i_fd, VIDIOC_G_FREQUENCY, &vf ) < 0 )
	    {
	        msg_Warn( p_input, "VIDIOC_G_FREQUENCY failed (%s)",
			strerror( errno ) );
	    }
	    else
	    {
	        vf.frequency = p_sys->i_frequency * 16 / 1000;
	        if( ioctl( p_sys->i_fd, VIDIOC_S_FREQUENCY, &vf ) < 0 )
		    {
		        msg_Warn( p_input, "VIDIOC_S_FREQUENCY failed (%s)",
			    strerror( errno ) );
		    }
	        else
		    {
		        msg_Dbg( p_input,"Tuner frequency set to:%d",p_sys->i_frequency);
		    }
	    }
	}

      /* codec parameters */
        if(p_sys->i_framerate != -1 
	        || p_sys->i_bitrate_mode != -1 
	        || p_sys->i_bitrate_peak != -1
	        || p_sys->i_bitrate != -1)
	    {
	        if( ioctl( p_sys->i_fd, IVTV_IOC_G_CODEC, &codec ) < 0 )
	        {
	            msg_Warn( p_input, "IVTV_IOC_G_CODEC failed" );
	        }
	    else
	    {
	        if(p_sys->i_framerate != -1)
		    {
		        switch( p_sys->i_framerate )
		        {
		            case 30:
		                codec.framerate = 0;
		            break;
		      
		            case 25:
		                codec.framerate = 1;
		            break;
		      
		            default:
		                msg_Warn( p_input, "invalid framerate, reverting to 25" );
		                codec.framerate = 1;
		            break;
		        }
		    }

	        if(p_sys->i_bitrate != -1)
            {
		        codec.bitrate = p_sys->i_bitrate;
            }

	        if(p_sys->i_bitrate_peak != -1)
            {
		        codec.bitrate_peak = p_sys->i_bitrate_peak;
            }

	        if(p_sys->i_bitrate_mode != -1)
            {
		        codec.bitrate_mode = p_sys->i_bitrate_mode;
            }

	        if( ioctl( p_sys->i_fd, IVTV_IOC_S_CODEC, &codec ) < 0 )
		    {
		        msg_Warn( p_input, "IVTV_IOC_S_CODEC failed" );
		    }
	        else
		    {
		        msg_Dbg( p_input, "Setting codec parameters to:  framerate: %d, bitrate: %d/%d/%d",
			   codec.framerate, codec.bitrate, codec.bitrate_peak, codec.bitrate_mode);
		    }
        }
	}

      /* do a quick read */
    if(p_sys->i_fd) 
	{
	    if(read(p_sys->i_fd,&"   ",1))
	    {
	        msg_Dbg(p_input, "Could read byte from device");
	    } 
	    else
	    {
	        msg_Warn(p_input, "Could not read byte from device");
	    }
	}
        return VLC_SUCCESS;
}

/*****************************************************************************
 * Close: close the device
 *****************************************************************************/
static void Close( vlc_object_t * p_this )
{
    input_thread_t * p_input = (input_thread_t*) p_this;
    access_sys_t * p_sys = p_input->p_access_data;

    close( p_sys->i_fd );
    free( p_sys );
}

/*****************************************************************************
 * Read
 *****************************************************************************/
static ssize_t Read( input_thread_t * p_input, byte_t * p_buffer,
                     size_t i_len )
{
    access_sys_t * p_sys = p_input->p_access_data;

    int i_ret;
    
    struct timeval timeout;
    fd_set fds;

    FD_ZERO( &fds );
    FD_SET( p_sys->i_fd, &fds );
    timeout.tv_sec = 0;
    timeout.tv_usec = 500000;

    while( !( i_ret = select( p_sys->i_fd + 1, &fds,
                              NULL, NULL, &timeout ) ) )
    {
        FD_ZERO( &fds );
        FD_SET( p_sys->i_fd, &fds );
        timeout.tv_sec = 0;
        timeout.tv_usec = 500000;

        if( p_input->b_die || p_input->b_error )
            return 0;
    }

    if( i_ret < 0 )
    {
        msg_Err( p_input, "select error (%s)", strerror( errno ) );
        return -1;
    }

    i_ret = read( p_sys->i_fd, p_buffer, i_len );
    return i_ret;
}