diff options
| -rw-r--r-- | src/libcamera/v4l2_videodevice.cpp | 155 |
1 files changed, 77 insertions, 78 deletions
diff --git a/src/libcamera/v4l2_videodevice.cpp b/src/libcamera/v4l2_videodevice.cpp index 2de3751f..12af3bd0 100644 --- a/src/libcamera/v4l2_videodevice.cpp +++ b/src/libcamera/v4l2_videodevice.cpp @@ -26,7 +26,7 @@ /** * \file v4l2_videodevice.h - * \brief V4L2 Video Device API + * \brief V4L2 Video Device */ namespace libcamera { @@ -48,89 +48,86 @@ LOG_DECLARE_CATEGORY(V4L2) /** * \fn V4L2Capability::card() - * \brief Retrieve the device card name - * \return The string containing the device name + * \brief Retrieve the video device card name + * \return The string containing the video device name */ /** * \fn V4L2Capability::bus_info() - * \brief Retrieve the location of the device in the system - * \return The string containing the device location + * \brief Retrieve the location of the video device in the system + * \return The string containing the video device location */ /** * \fn V4L2Capability::device_caps() - * \brief Retrieve the capabilities of the device - * \return The device specific capabilities if V4L2_CAP_DEVICE_CAPS is set or - * driver capabilities otherwise + * \brief Retrieve the capabilities of the video device + * \return The video device specific capabilities if V4L2_CAP_DEVICE_CAPS is + * set or driver capabilities otherwise */ /** * \fn V4L2Capability::isMultiplanar() - * \brief Identify if the device implements the V4L2 multiplanar APIs - * \return True if the device supports multiplanar APIs + * \brief Identify if the video device implements the V4L2 multiplanar APIs + * \return True if the video device supports multiplanar APIs */ /** * \fn V4L2Capability::isCapture() - * \brief Identify if the device captures data - * \return True if the device can capture data + * \brief Identify if the video device captures data + * \return True if the video device can capture data */ /** * \fn V4L2Capability::isOutput() - * \brief Identify if the device outputs data - * \return True if the device can output data + * \brief Identify if the video device outputs data + * \return True if the video device can output data */ /** * \fn V4L2Capability::isVideo() - * \brief Identify if the device captures or outputs images - * \return True if the device can capture or output images + * \brief Identify if the video device captures or outputs images + * \return True if the video device can capture or output images */ /** * \fn V4L2Capability::isMeta() - * \brief Identify if the device captures or outputs image meta-data - * - * \todo Add support for META_CAPTURE introduced in Linux v5.0 - * - * \return True if the device can capture or output image meta-data + * \brief Identify if the video device captures or outputs image meta-data + * \return True if the video device can capture or output image meta-data */ /** * \fn V4L2Capability::isVideoCapture() - * \brief Identify if the device captures images - * \return True if the device can capture images + * \brief Identify if the video device captures images + * \return True if the video device can capture images */ /** * \fn V4L2Capability::isVideoOutput() - * \brief Identify if the device outputs images - * \return True if the device can output images + * \brief Identify if the video device outputs images + * \return True if the video device can output images */ /** * \fn V4L2Capability::isMetaCapture() - * \brief Identify if the device captures image meta-data - * \return True if the device can capture image meta-data + * \brief Identify if the video device captures image meta-data + * \return True if the video device can capture image meta-data */ /** * \fn V4L2Capability::isMetaOutput() - * \brief Identify if the device outputs image meta-data - * \return True if the device can output image meta-data + * \brief Identify if the video device outputs image meta-data + * \return True if the video device can output image meta-data */ /** * \fn V4L2Capability::hasStreaming() - * \brief Determine if the device can perform Streaming I/O - * \return True if the device provides Streaming I/O IOCTLs + * \brief Determine if the video device can perform Streaming I/O + * \return True if the video device provides Streaming I/O IOCTLs */ /** * \class V4L2DeviceFormat - * \brief The V4L2 device image format and sizes + * \brief The V4L2 video device image format and sizes * * This class describes the image format and resolution to be programmed on a * V4L2 video device. The image format is defined by a fourcc code (as specified @@ -176,27 +173,28 @@ LOG_DECLARE_CATEGORY(V4L2) * length and total size. * * Packed image formats, which occupy a single memory area, are easily described - * through the single-plane API. When used on a device that implements the + * through the single-plane API. When used on a video device that implements the * multi-plane API, only the size and stride information contained in the first * plane are taken into account. * * Planar image formats, which occupy distinct memory areas, are easily - * described through the multi-plane APIs. When used on a device that implements - * the single-plane API, all planes are stored one after the other in a - * contiguous memory area, and it is not possible to configure per-plane stride - * length and size, but only a global stride length which is applied to all - * planes. + * described through the multi-plane APIs. When used on a video device that + * implements the single-plane API, all planes are stored one after the other + * in a contiguous memory area, and it is not possible to configure per-plane + * stride length and size, but only a global stride length which is applied to + * all planes. * * The V4L2DeviceFormat class describes both packed and planar image formats, - * regardless of the API type (single or multi plane) implemented by the device - * the format has to be applied to. The total size and bytes per line of images - * represented with packed formats are configured using the first entry of the - * V4L2DeviceFormat::planes array, while the per-plane size and per-plane stride - * length of images represented with planar image formats are configured using - * the opportune number of entries of the V4L2DeviceFormat::planes array, as - * prescribed by the image format definition (semi-planar formats use 2 entries, - * while planar formats use the whole 3 entries). The number of valid entries of - * the V4L2DeviceFormat::planes array is defined by the + * regardless of the API type (single or multi plane) implemented by the video + * device the format has to be applied to. The total size and bytes per line + * of images represented with packed formats are configured using the first + * entry of the V4L2DeviceFormat::planes array, while the per-plane size and + * per-plane stride length of images represented with planar image formats are + * configured using the opportune number of entries of the + * V4L2DeviceFormat::planes array, as prescribed by the image format + * definition (semi-planar formats use 2 entries, while planar formats use the + * whole 3 entries). The number of valid entries of the + * V4L2DeviceFormat::planes array is defined by the * V4L2DeviceFormat::planesCount value. */ @@ -246,13 +244,13 @@ const std::string V4L2DeviceFormat::toString() const * \class V4L2VideoDevice * \brief V4L2VideoDevice object and API * - * The V4L2 Device API class models an instance of a V4L2 device node. + * The V4L2VideoDevice class models an instance of a V4L2 video device. * It is constructed with the path to a V4L2 video device node. The device node * is only opened upon a call to open() which must be checked for success. * - * The device capabilities are validated when the device is opened and the - * device is rejected if it is not a suitable V4L2 capture or output device, or - * if the device does not support streaming I/O. + * The video device capabilities are validated when the device is opened and the + * device is rejected if it is not a suitable V4L2 capture or output video + * device, or if the video device does not support streaming I/O. * * No API call other than open(), isOpen() and close() shall be called on an * unopened device instance. @@ -274,8 +272,8 @@ V4L2VideoDevice::V4L2VideoDevice(const std::string &deviceNode) queuedBuffersCount_(0), fdEvent_(nullptr) { /* - * We default to an MMAP based CAPTURE device, however this will be - * updated based upon the device capabilities. + * We default to an MMAP based CAPTURE video device, however this will + * be updated based upon the device capabilities. */ bufferType_ = V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE; memoryType_ = V4L2_MEMORY_MMAP; @@ -283,7 +281,7 @@ V4L2VideoDevice::V4L2VideoDevice(const std::string &deviceNode) /** * \brief Construct a V4L2VideoDevice from a MediaEntity - * \param[in] entity The MediaEntity to build the device from + * \param[in] entity The MediaEntity to build the video device from * * Construct a V4L2VideoDevice from a MediaEntity's device node path. */ @@ -298,7 +296,7 @@ V4L2VideoDevice::~V4L2VideoDevice() } /** - * \brief Open a V4L2 device and query its capabilities + * \brief Open a V4L2 video device and query its capabilities * \return 0 on success or a negative error code otherwise */ int V4L2VideoDevice::open() @@ -327,8 +325,9 @@ int V4L2VideoDevice::open() } /* - * Set buffer type and wait for read notifications on CAPTURE devices - * (POLLIN), and write notifications for OUTPUT devices (POLLOUT). + * Set buffer type and wait for read notifications on CAPTURE video + * devices (POLLIN), and write notifications for OUTPUT video devices + * (POLLOUT). */ if (caps_.isVideoCapture()) { fdEvent_ = new EventNotifier(fd(), EventNotifier::Read); @@ -358,7 +357,7 @@ int V4L2VideoDevice::open() } /** - * \brief Close the device, releasing any resources acquired by open() + * \brief Close the video device, releasing any resources acquired by open() */ void V4L2VideoDevice::close() { @@ -379,7 +378,7 @@ void V4L2VideoDevice::close() /** * \fn V4L2VideoDevice::deviceName() - * \brief Retrieve the name of the V4L2 device + * \brief Retrieve the name of the V4L2 video device * \return The string containing the device name */ @@ -395,8 +394,8 @@ std::string V4L2VideoDevice::logPrefix() const } /** - * \brief Retrieve the image format set on the V4L2 device - * \param[out] format The image format applied on the device + * \brief Retrieve the image format set on the V4L2 video device + * \param[out] format The image format applied on the video device * \return 0 on success or a negative error code otherwise */ int V4L2VideoDevice::getFormat(V4L2DeviceFormat *format) @@ -410,10 +409,10 @@ int V4L2VideoDevice::getFormat(V4L2DeviceFormat *format) } /** - * \brief Configure an image format on the V4L2 device - * \param[inout] format The image format to apply to the device + * \brief Configure an image format on the V4L2 video device + * \param[inout] format The image format to apply to the video device * - * Apply the supplied \a format to the device, and return the actually + * Apply the supplied \a format to the video device, and return the actually * applied format parameters, as \ref V4L2VideoDevice::getFormat would do. * * \return 0 on success or a negative error code otherwise @@ -467,7 +466,7 @@ int V4L2VideoDevice::setFormatMeta(V4L2DeviceFormat *format) } /* - * Return to caller the format actually applied on the device, + * Return to caller the format actually applied on the video device, * which might differ from the requested one. */ format->size.width = 0; @@ -531,7 +530,7 @@ int V4L2VideoDevice::setFormatMultiplane(V4L2DeviceFormat *format) } /* - * Return to caller the format actually applied on the device, + * Return to caller the format actually applied on the video device, * which might differ from the requested one. */ format->size.width = pix->width; @@ -606,7 +605,7 @@ int V4L2VideoDevice::setFormatSingleplane(V4L2DeviceFormat *format) * * Enumerate all pixel formats and frame sizes supported by the video device. * - * \return A list of the supported device formats + * \return A list of the supported video device formats */ ImageFormats V4L2VideoDevice::formats() { @@ -651,8 +650,8 @@ int V4L2VideoDevice::requestBuffers(unsigned int count) } /** - * \brief Request buffers to be allocated from the device and stored in the - * buffer pool provided. + * \brief Request buffers to be allocated from the video device and stored in + * the buffer pool provided. * \param[out] pool BufferPool to populate with buffers * \return 0 on success or a negative error code otherwise */ @@ -883,13 +882,13 @@ int V4L2VideoDevice::releaseBuffers() } /** - * \brief Queue a buffer into the device + * \brief Queue a buffer into the video device * \param[in] buffer The buffer to be queued * - * For capture devices the \a buffer will be filled with data by the device. - * For output devices the \a buffer shall contain valid data and will be - * processed by the device. Once the device has finished processing the buffer, - * it will be available for dequeue. + * For capture video devices the \a buffer will be filled with data by the + * device. For output video devices the \a buffer shall contain valid data and + * will be processed by the device. Once the device has finished processing the + * buffer, it will be available for dequeue. * * \return 0 on success or a negative error code otherwise */ @@ -946,7 +945,7 @@ int V4L2VideoDevice::queueBuffer(Buffer *buffer) } /** - * \brief Dequeue the next available buffer from the device + * \brief Dequeue the next available buffer from the video device * * This method dequeues the next available buffer from the device. If no buffer * is available to be dequeued it will return nullptr immediately. @@ -992,14 +991,14 @@ Buffer *V4L2VideoDevice::dequeueBuffer() } /** - * \brief Slot to handle completed buffer events from the V4L2 device + * \brief Slot to handle completed buffer events from the V4L2 video device * \param[in] notifier The event notifier * * When this slot is called, a Buffer has become available from the device, and * will be emitted through the bufferReady Signal. * - * For Capture devices the Buffer will contain valid data. - * For Output devices the Buffer can be considered empty. + * For Capture video devices the Buffer will contain valid data. + * For Output video devices the Buffer can be considered empty. */ void V4L2VideoDevice::bufferAvailable(EventNotifier *notifier) { |