234 lines
7.4 KiB
C
234 lines
7.4 KiB
C
/*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef AVDEVICE_AVDEVICE_H
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#define AVDEVICE_AVDEVICE_H
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#include "version.h"
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/**
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* @file
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* @ingroup lavd
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* Main libavdevice API header
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*/
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/**
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* @defgroup lavd Special devices muxing/demuxing library
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* @{
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* Libavdevice is a complementary library to @ref libavf "libavformat". It
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* provides various "special" platform-specific muxers and demuxers, e.g. for
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* grabbing devices, audio capture and playback etc. As a consequence, the
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* (de)muxers in libavdevice are of the AVFMT_NOFILE type (they use their own
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* I/O functions). The filename passed to avformat_open_input() often does not
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* refer to an actually existing file, but has some special device-specific
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* meaning - e.g. for x11grab it is the display name.
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*
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* To use libavdevice, simply call avdevice_register_all() to register all
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* compiled muxers and demuxers. They all use standard libavformat API.
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* @}
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*/
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#include "libavformat/avformat.h"
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/**
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* Return the LIBAVDEVICE_VERSION_INT constant.
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*/
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unsigned avdevice_version(void);
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/**
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* Return the libavdevice build-time configuration.
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*/
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const char *avdevice_configuration(void);
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/**
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* Return the libavdevice license.
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*/
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const char *avdevice_license(void);
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/**
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* Initialize libavdevice and register all the input and output devices.
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* @warning This function is not thread safe.
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*/
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void avdevice_register_all(void);
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typedef struct AVDeviceRect {
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int x; /**< x coordinate of top left corner */
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int y; /**< y coordinate of top left corner */
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int width; /**< width */
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int height; /**< height */
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} AVDeviceRect;
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/**
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* Message types used by avdevice_app_to_dev_control_message().
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*/
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enum AVAppToDevMessageType {
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/**
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* Dummy message.
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*/
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AV_APP_TO_DEV_NONE = MKBETAG('N','O','N','E'),
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/**
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* Window size change message.
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*
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* Message is sent to the device every time the application changes the size
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* of the window device renders to.
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* Message should also be sent right after window is created.
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*
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* data: AVDeviceRect: new window size.
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*/
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AV_APP_TO_DEV_WINDOW_SIZE = MKBETAG('G','E','O','M'),
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/**
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* Repaint request message.
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*
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* Message is sent to the device when window have to be rapainted.
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*
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* data: AVDeviceRect: area required to be repainted.
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* NULL: whole area is required to be repainted.
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*/
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AV_APP_TO_DEV_WINDOW_REPAINT = MKBETAG('R','E','P','A')
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};
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/**
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* Message types used by avdevice_dev_to_app_control_message().
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*/
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enum AVDevToAppMessageType {
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/**
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* Dummy message.
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*/
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AV_DEV_TO_APP_NONE = MKBETAG('N','O','N','E'),
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/**
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* Create window buffer message.
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*
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* Device requests to create a window buffer. Exact meaning is device-
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* and application-dependent. Message is sent before rendering first
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* frame and all one-shot initializations should be done here.
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* Application is allowed to ignore preferred window buffer size.
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*
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* @note: Application is obligated to inform about window buffer size
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* with AV_APP_TO_DEV_WINDOW_SIZE message.
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*
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* data: AVDeviceRect: preferred size of the window buffer.
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* NULL: no preferred size of the window buffer.
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*/
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AV_DEV_TO_APP_CREATE_WINDOW_BUFFER = MKBETAG('B','C','R','E'),
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/**
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* Prepare window buffer message.
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*
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* Device requests to prepare a window buffer for rendering.
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* Exact meaning is device- and application-dependent.
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* Message is sent before rendering of each frame.
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*
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* data: NULL.
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*/
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AV_DEV_TO_APP_PREPARE_WINDOW_BUFFER = MKBETAG('B','P','R','E'),
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/**
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* Display window buffer message.
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*
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* Device requests to display a window buffer.
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* Message is sent when new frame is ready to be displyed.
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* Usually buffers need to be swapped in handler of this message.
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*
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* data: NULL.
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*/
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AV_DEV_TO_APP_DISPLAY_WINDOW_BUFFER = MKBETAG('B','D','I','S'),
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/**
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* Destroy window buffer message.
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*
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* Device requests to destroy a window buffer.
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* Message is sent when device is about to be destroyed and window
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* buffer is not required anymore.
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*
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* data: NULL.
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*/
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AV_DEV_TO_APP_DESTROY_WINDOW_BUFFER = MKBETAG('B','D','E','S')
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};
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/**
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* Send control message from application to device.
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*
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* @param s device context.
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* @param type message type.
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* @param data message data. Exact type depends on message type.
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* @param data_size size of message data.
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* @return >= 0 on success, negative on error.
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* AVERROR(ENOSYS) when device doesn't implement handler of the message.
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*/
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int avdevice_app_to_dev_control_message(struct AVFormatContext *s,
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enum AVAppToDevMessageType type,
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void *data, size_t data_size);
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/**
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* Send control message from device to application.
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*
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* @param s device context.
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* @param type message type.
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* @param data message data. Can be NULL.
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* @param data_size size of message data.
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* @return >= 0 on success, negative on error.
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* AVERROR(ENOSYS) when application doesn't implement handler of the message.
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*/
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int avdevice_dev_to_app_control_message(struct AVFormatContext *s,
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enum AVDevToAppMessageType type,
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void *data, size_t data_size);
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/**
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* Structure describes basic parameters of the device.
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*/
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typedef struct AVDeviceInfo {
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char *device_name; /**< device name, format depends on device */
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char *device_description; /**< human friendly name */
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} AVDeviceInfo;
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/**
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* List of devices.
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*/
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typedef struct AVDeviceInfoList {
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AVDeviceInfo **devices; /**< list of autodetected devices */
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int nb_devices; /**< number of autodetected devices */
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int default_device; /**< index of default device or -1 if no default */
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} AVDeviceInfoList;
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/**
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* List devices.
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*
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* Returns available device names and their parameters.
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*
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* @note: Some devices may accept system-dependent device names that cannot be
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* autodetected. The list returned by this function cannot be assumed to
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* be always completed.
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*
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* @param s device context.
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* @param[out] device_list list of autodetected devices.
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* @return count of autodetected devices, negative on error.
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*/
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int avdevice_list_devices(struct AVFormatContext *s, AVDeviceInfoList **device_list);
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/**
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* Convinient function to free result of avdevice_list_devices().
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*
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* @param devices device list to be freed.
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*/
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void avdevice_free_list_devices(AVDeviceInfoList **device_list);
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#endif /* AVDEVICE_AVDEVICE_H */
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