mirror of
https://code.videolan.org/videolan/vlc
synced 2024-09-04 09:11:33 +02:00
* Some more probing
* The debug output from a v4l2 capable webcam with this would help...
This commit is contained in:
Benjamin Pracht
parent
ba42d61b37
commit
92f7ddf2f9
@ -53,6 +53,10 @@ static void Close( vlc_object_t * );
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#define DEV_LONGTEXT N_( \
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"Name of the device to use. " \
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"If you don't specify anything, /dev/video0 will be used.")
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#define INPUT_TEXT N_( "Input" )
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#define INPUT_LONGTEXT N_( \
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"Input of the card to use (Usually, 0 = tuner, " \
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"1 = composite, 2 = svideo)." )
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vlc_module_begin();
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@ -63,6 +67,8 @@ vlc_module_begin();
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add_string( "v4l2-dev", "/dev/video0", 0, DEV_TEXT, DEV_LONGTEXT,
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VLC_FALSE );
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add_integer( "v4l2-input", 0, NULL, INPUT_TEXT, INPUT_LONGTEXT,
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VLC_TRUE );
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add_shortcut( "v4l2" );
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set_capability( "access_demux", 10 );
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@ -73,10 +79,13 @@ vlc_module_end();
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* Access: local prototypes
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*****************************************************************************/
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static int Demux ( demux_t * );
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static int DemuxMMAP( demux_t * );
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static int Control( demux_t *, int, va_list );
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static int OpenDev( demux_t * );
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static int ProbeDev( demux_t * );
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static int OpenVideoDev( demux_t * );
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static block_t *GrabVideo( demux_t * );
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struct demux_sys_t
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{
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@ -88,6 +97,7 @@ struct demux_sys_t
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int i_input;
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struct v4l2_input *p_inputs;
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int i_selected_input;
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int i_audio;
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/* V4L2 devices cannot have more than 32 audio inputs */
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@ -95,6 +105,9 @@ struct demux_sys_t
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int i_tuner;
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struct v4l2_tuner *p_tuners;
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int i_codec;
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struct v4l2_fmtdesc *p_codecs;
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};
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/*****************************************************************************
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@ -111,7 +124,6 @@ static int Open( vlc_object_t *p_this )
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demux_sys_t sys;
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/* Set up p_demux */
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p_demux->pf_demux = Demux;
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p_demux->pf_control = Control;
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p_demux->info.i_update = 0;
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p_demux->info.i_title = 0;
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@ -123,7 +135,9 @@ static int Open( vlc_object_t *p_this )
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p_sys->psz_device = var_CreateGetString( p_demux, "v4l2-dev" );
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if( OpenDev( p_demux ) < 0 ) return VLC_EGENERIC;
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if( ProbeDev( p_demux ) < 0 ) return VLC_EGENERIC;
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if( OpenVideoDev( p_demux ) < 0 ) return VLC_EGENERIC;
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return VLC_SUCCESS;
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}
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@ -136,8 +150,12 @@ static void Close( vlc_object_t *p_this )
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demux_t *p_demux = (demux_t *)p_this;
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demux_sys_t *p_sys = p_demux->p_sys;
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if( p_sys->i_fd_video >= 0 ) close( p_sys->i_fd_video );
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if( p_sys->psz_device ) free( p_sys->psz_device );
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if( p_sys->p_inputs ) free( p_sys->p_inputs );
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if( p_sys->p_tuners ) free( p_sys->p_tuners );
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if( p_sys->p_codecs ) free( p_sys->p_codecs );
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free( p_sys );
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}
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@ -152,17 +170,77 @@ static int Control( demux_t *p_demux, int i_query, va_list args )
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/*****************************************************************************
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* Demux:
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*****************************************************************************/
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static int Demux( demux_t *p_demux )
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static int DemuxMMAP( demux_t *p_demux )
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{
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}
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/*****************************************************************************
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* OpenDev: open the device and probe for capabilities
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* OpenVideoDev: open and set up the video device and probe for capabilities
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*****************************************************************************/
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int OpenDev( demux_t *p_demux )
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int OpenVideoDev( demux_t *p_demux )
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{
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int i_device_index;
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int i_fd;
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demux_sys_t *p_sys = p_demux->p_sys;
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if( ( i_fd = open( p_sys->psz_device, O_RDWR ) ) < 0 )
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{
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msg_Err( p_demux, "cannot open device (%s)", strerror( errno ) );
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goto open_failed;
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}
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p_sys->i_fd_video = i_fd;
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if( p_sys->i_selected_input = var_CreateGetInteger( p_demux, "v4l2-input" )
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> p_sys->i_input )
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{
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msg_Warn( p_demux, "invalid input. Using the default one" );
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p_sys->i_selected_input = 0;
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}
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if( ioctl( i_fd, VIDIOC_S_INPUT, &p_sys->i_selected_input ) < 0 )
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{
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msg_Err( p_demux, "cannot set input (%s)", strerror( errno ) );
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goto open_failed;
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}
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if( p_sys->dev_cap.capabilities & V4L2_CAP_STREAMING )
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{
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struct v4l2_requestbuffers reqbuf;
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reqbuf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
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reqbuf.memory = V4L2_MEMORY_MMAP;
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reqbuf.count = 0;
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if( ioctl( i_fd, VIDIOC_REQBUFS, &reqbuf ) < 0 )
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{
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msg_Err( p_demux, "cannot initiate I/O operation (%s). "
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"Only MMAP is supported at the moment", strerror( errno ) );
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goto open_failed;
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}
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p_demux->pf_demux = DemuxMMAP;
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}
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else
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{
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msg_Warn( p_demux, "I/O method not supported at the moment" );
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goto open_failed;
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}
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return VLC_SUCCESS;
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open_failed:
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if( i_fd ) close( i_fd );
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p_sys->i_fd_video = 0;
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return VLC_EGENERIC;
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}
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/*****************************************************************************
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* ProbeDev: probe for capabilities
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*****************************************************************************/
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int ProbeDev( demux_t *p_demux )
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{
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int i_index;
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int i_fd;
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demux_sys_t *p_sys = p_demux->p_sys;
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@ -189,14 +267,14 @@ int OpenDev( demux_t *p_demux )
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p_sys->dev_cap.version & 0xFF,
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p_sys->dev_cap.bus_info );
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msg_Dbg( p_demux, "The device has the capabilities: (%c) Video Capure, "
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msg_Dbg( p_demux, "the device has the capabilities: (%c) Video Capure, "
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"(%c) Audio, "
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"(%c) Tuner",
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( p_sys->dev_cap.capabilities & V4L2_CAP_VIDEO_CAPTURE ? 'X':' '),
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( p_sys->dev_cap.capabilities & V4L2_CAP_AUDIO ? 'X':' '),
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( p_sys->dev_cap.capabilities & V4L2_CAP_TUNER ? 'X':' ') );
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msg_Dbg( p_demux, "Supported I/O methods are: (%c) Read/Write, "
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msg_Dbg( p_demux, "supported I/O methods are: (%c) Read/Write, "
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"(%c) Streaming, "
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"(%c) Asynchronous",
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( p_sys->dev_cap.capabilities & V4L2_CAP_READWRITE ? 'X':' ' ),
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@ -218,20 +296,20 @@ int OpenDev( demux_t *p_demux )
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if( !p_sys->p_inputs ) goto open_failed;
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memset( p_sys->p_inputs, 0, sizeof( struct v4l2_input ) );
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for( i_device_index = 0; i_device_index < p_sys->i_input; i_device_index++ )
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for( i_index = 0; i_index < p_sys->i_input; i_index++ )
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{
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p_sys->p_inputs[i_device_index].index = i_device_index;
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p_sys->p_inputs[i_index].index = i_index;
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if( ioctl( i_fd, VIDIOC_ENUMINPUT, &p_sys->p_inputs[i_device_index] ) )
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if( ioctl( i_fd, VIDIOC_ENUMINPUT, &p_sys->p_inputs[i_index] ) )
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{
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msg_Err( p_demux, "cannot get video input characteristics (%s)",
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strerror( errno ) );
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goto open_failed;
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}
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msg_Dbg( p_demux, "Video input %i (%s) has type: %s",
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i_device_index,
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p_sys->p_inputs[i_device_index].name,
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p_sys->p_inputs[i_device_index].type
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msg_Dbg( p_demux, "video input %i (%s) has type: %s",
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i_index,
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p_sys->p_inputs[i_index].name,
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p_sys->p_inputs[i_index].type
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== V4L2_INPUT_TYPE_TUNER ?
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"Tuner adapter" :
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"External analog input" );
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@ -239,9 +317,9 @@ int OpenDev( demux_t *p_demux )
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}
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/* initialize the structures for the ioctls */
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for( i_device_index = 0; i_device_index < 32; i_device_index++ )
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for( i_index = 0; i_index < 32; i_index++ )
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{
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p_sys->p_audios[i_device_index].index = i_device_index;
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p_sys->p_audios[i_index].index = i_index;
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}
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/* Probe audio inputs */
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@ -258,7 +336,7 @@ int OpenDev( demux_t *p_demux )
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goto open_failed;
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}
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msg_Dbg( p_demux, "Audio device %i (%s) is %s",
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msg_Dbg( p_demux, "audio device %i (%s) is %s",
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p_sys->i_audio,
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p_sys->p_audios[p_sys->i_audio].name,
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p_sys->p_audios[p_sys->i_audio].capability &
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@ -271,8 +349,7 @@ int OpenDev( demux_t *p_demux )
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if( p_sys->dev_cap.capabilities & V4L2_CAP_TUNER )
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{
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struct v4l2_tuner tuner;
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memset( &tuner, 0, sizeof( struct v4l2_tuner ) );
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struct v4l2_tuner tuner = {};
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while( ioctl( i_fd, VIDIOC_S_TUNER, &tuner ) >= 0 )
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{
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@ -284,34 +361,71 @@ int OpenDev( demux_t *p_demux )
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if( !p_sys->p_tuners ) goto open_failed;
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memset( p_sys->p_tuners, 0, sizeof( struct v4l2_tuner ) );
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for( i_device_index = 0; i_device_index < p_sys->i_tuner; i_device_index++ )
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for( i_index = 0; i_index < p_sys->i_tuner; i_index++ )
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{
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p_sys->p_tuners[i_device_index].index = i_device_index;
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p_sys->p_tuners[i_index].index = i_index;
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if( ioctl( i_fd, VIDIOC_G_TUNER, &p_sys->p_tuners[i_device_index] ) )
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if( ioctl( i_fd, VIDIOC_G_TUNER, &p_sys->p_tuners[i_index] ) )
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{
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msg_Err( p_demux, "cannot get tuner characteristics (%s)",
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strerror( errno ) );
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goto open_failed;
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}
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msg_Dbg( p_demux, "Tuner %i (%s) has type: %s, "
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msg_Dbg( p_demux, "tuner %i (%s) has type: %s, "
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"frequency range: %.1f %s -> %.1f %s",
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i_device_index,
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p_sys->p_tuners[i_device_index].name,
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p_sys->p_tuners[i_device_index].type
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i_index,
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p_sys->p_tuners[i_index].name,
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p_sys->p_tuners[i_index].type
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== V4L2_TUNER_RADIO ?
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"Radio" : "Analog TV",
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p_sys->p_tuners[i_device_index].rangelow * 62.5,
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p_sys->p_tuners[i_device_index].capability &
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p_sys->p_tuners[i_index].rangelow * 62.5,
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p_sys->p_tuners[i_index].capability &
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V4L2_TUNER_CAP_LOW ?
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"Hz" : "kHz",
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p_sys->p_tuners[i_device_index].rangehigh * 62.5,
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p_sys->p_tuners[i_device_index].capability &
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p_sys->p_tuners[i_index].rangehigh * 62.5,
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p_sys->p_tuners[i_index].capability &
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V4L2_TUNER_CAP_LOW ?
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"Hz" : "kHz" );
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}
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}
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/* Probe for available chromas */
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if( p_sys->dev_cap.capabilities & V4L2_CAP_VIDEO_CAPTURE )
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{
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struct v4l2_fmtdesc codec = {};
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i_index = 0;
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codec.index = i_index;
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codec.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
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while( ioctl( i_fd, VIDIOC_ENUM_FMT, &codec ) >= 0 )
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{
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i_index++;
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codec.index = i_index;
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}
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p_sys->i_codec = i_index;
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p_sys->p_codecs = malloc( p_sys->i_codec * sizeof( struct v4l2_fmtdesc ) );
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memset( p_sys->p_codecs, 0, p_sys->i_codec * sizeof( struct v4l2_fmtdesc ) );
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for( i_index = 0; i_index < p_sys->i_codec; i_index++ )
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{
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p_sys->p_codecs[i_index].index = i_index;
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p_sys->p_codecs[i_index].type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
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if( ioctl( i_fd, VIDIOC_ENUM_FMT, &p_sys->p_codecs[i_index] ) < 0 )
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{
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msg_Err( p_demux, "cannot get codec description (%s)", strerror( errno ) );
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goto open_failed;
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}
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msg_Dbg( p_demux, "device supports Codec %s",
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p_sys->p_codecs[i_index].description );
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}
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}
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if( i_fd >= 0 ) close( i_fd );
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return VLC_SUCCESS;
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