tool/VideoPlayer.git

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			/*
			* This file is part of FFmpeg.
			*
			* FFmpeg is free software; you can redistribute it and/or
			* modify it under the terms of the GNU Lesser General Public
			* License as published by the Free Software Foundation; either
			* version 2.1 of the License, or (at your option) any later version.
			*
			* FFmpeg is distributed in the hope that it will be useful,
			* but WITHOUT ANY WARRANTY; without even the implied warranty of
			* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
			* Lesser General Public License for more details.
			*
			* You should have received a copy of the GNU Lesser General Public
			* License along with FFmpeg; if not, write to the Free Software
			* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
			*/

			#ifndef AVDEVICE_AVDEVICE_H
			#define AVDEVICE_AVDEVICE_H

			#include "version.h"

			/**
			* @file
			* @ingroup lavd
			* Main libavdevice API header
			*/

			/**
			* @defgroup lavd libavdevice
			* Special devices muxing/demuxing library.
			*
			* Libavdevice is a complementary library to @ref libavf "libavformat". It
			* provides various "special" platform-specific muxers and demuxers, e.g. for
			* grabbing devices, audio capture and playback etc. As a consequence, the
			* (de)muxers in libavdevice are of the AVFMT_NOFILE type (they use their own
			* I/O functions). The filename passed to avformat_open_input() often does not
			* refer to an actually existing file, but has some special device-specific
			* meaning - e.g. for xcbgrab it is the display name.
			*
			* To use libavdevice, simply call avdevice_register_all() to register all
			* compiled muxers and demuxers. They all use standard libavformat API.
			*
			* @{
			*/

			#include "libavutil/log.h"
			#include "libavutil/opt.h"
			#include "libavutil/dict.h"
			#include "libavformat/avformat.h"

			/**
			* Return the LIBAVDEVICE_VERSION_INT constant.
			*/
			unsigned avdevice_version(void);

			/**
			* Return the libavdevice build-time configuration.
			*/
			const char *avdevice_configuration(void);

			/**
			* Return the libavdevice license.
			*/
			const char *avdevice_license(void);

			/**
			* Initialize libavdevice and register all the input and output devices.
			*/
			void avdevice_register_all(void);

			/**
			* Audio input devices iterator.
			*
			* If d is NULL, returns the first registered input audio/video device,
			* if d is non-NULL, returns the next registered input audio/video device after d
			* or NULL if d is the last one.
			*/
			AVInputFormat av_input_audio_device_next(AVInputFormat d);

			/**
			* Video input devices iterator.
			*
			* If d is NULL, returns the first registered input audio/video device,
			* if d is non-NULL, returns the next registered input audio/video device after d
			* or NULL if d is the last one.
			*/
			AVInputFormat av_input_video_device_next(AVInputFormat d);

			/**
			* Audio output devices iterator.
			*
			* If d is NULL, returns the first registered output audio/video device,
			* if d is non-NULL, returns the next registered output audio/video device after d
			* or NULL if d is the last one.
			*/
			AVOutputFormat av_output_audio_device_next(AVOutputFormat d);

			/**
			* Video output devices iterator.
			*
			* If d is NULL, returns the first registered output audio/video device,
			* if d is non-NULL, returns the next registered output audio/video device after d
			* or NULL if d is the last one.
			*/
			AVOutputFormat av_output_video_device_next(AVOutputFormat d);

			typedef struct AVDeviceRect {
			int x; /*< x coordinate of top left corner /
			int y; /*< y coordinate of top left corner /
			int width; /*< width /
			int height; /*< height /
			} AVDeviceRect;

			/**
			* Message types used by avdevice_app_to_dev_control_message().
			*/
			enum AVAppToDevMessageType {
			/**
			* Dummy message.
			*/
			AV_APP_TO_DEV_NONE = MKBETAG('N','O','N','E'),

			/**
			* Window size change message.
			*
			* Message is sent to the device every time the application changes the size
			* of the window device renders to.
			* Message should also be sent right after window is created.
			*
			* data: AVDeviceRect: new window size.
			*/
			AV_APP_TO_DEV_WINDOW_SIZE = MKBETAG('G','E','O','M'),

			/**
			* Repaint request message.
			*
			* Message is sent to the device when window has to be repainted.
			*
			* data: AVDeviceRect: area required to be repainted.
			* NULL: whole area is required to be repainted.
			*/
			AV_APP_TO_DEV_WINDOW_REPAINT = MKBETAG('R','E','P','A'),

			/**
			* Request pause/play.
			*
			* Application requests pause/unpause playback.
			* Mostly usable with devices that have internal buffer.
			* By default devices are not paused.
			*
			* data: NULL
			*/
			AV_APP_TO_DEV_PAUSE = MKBETAG('P', 'A', 'U', ' '),
			AV_APP_TO_DEV_PLAY = MKBETAG('P', 'L', 'A', 'Y'),
			AV_APP_TO_DEV_TOGGLE_PAUSE = MKBETAG('P', 'A', 'U', 'T'),

			/**
			* Volume control message.
			*
			* Set volume level. It may be device-dependent if volume
			* is changed per stream or system wide. Per stream volume
			* change is expected when possible.
			*
			* data: double: new volume with range of 0.0 - 1.0.
			*/
			AV_APP_TO_DEV_SET_VOLUME = MKBETAG('S', 'V', 'O', 'L'),

			/**
			* Mute control messages.
			*
			* Change mute state. It may be device-dependent if mute status
			* is changed per stream or system wide. Per stream mute status
			* change is expected when possible.
			*
			* data: NULL.
			*/
			AV_APP_TO_DEV_MUTE = MKBETAG(' ', 'M', 'U', 'T'),
			AV_APP_TO_DEV_UNMUTE = MKBETAG('U', 'M', 'U', 'T'),
			AV_APP_TO_DEV_TOGGLE_MUTE = MKBETAG('T', 'M', 'U', 'T'),

			/**
			* Get volume/mute messages.
			*
			* Force the device to send AV_DEV_TO_APP_VOLUME_LEVEL_CHANGED or
			* AV_DEV_TO_APP_MUTE_STATE_CHANGED command respectively.
			*
			* data: NULL.
			*/
			AV_APP_TO_DEV_GET_VOLUME = MKBETAG('G', 'V', 'O', 'L'),
			AV_APP_TO_DEV_GET_MUTE = MKBETAG('G', 'M', 'U', 'T'),
			};

			/**
			* Message types used by avdevice_dev_to_app_control_message().
			*/
			enum AVDevToAppMessageType {
			/**
			* Dummy message.
			*/
			AV_DEV_TO_APP_NONE = MKBETAG('N','O','N','E'),

			/**
			* Create window buffer message.
			*
			* Device requests to create a window buffer. Exact meaning is device-
			* and application-dependent. Message is sent before rendering first
			* frame and all one-shot initializations should be done here.
			* Application is allowed to ignore preferred window buffer size.
			*
			* @note: Application is obligated to inform about window buffer size
			* with AV_APP_TO_DEV_WINDOW_SIZE message.
			*
			* data: AVDeviceRect: preferred size of the window buffer.
			* NULL: no preferred size of the window buffer.
			*/
			AV_DEV_TO_APP_CREATE_WINDOW_BUFFER = MKBETAG('B','C','R','E'),

			/**
			* Prepare window buffer message.
			*
			* Device requests to prepare a window buffer for rendering.
			* Exact meaning is device- and application-dependent.
			* Message is sent before rendering of each frame.
			*
			* data: NULL.
			*/
			AV_DEV_TO_APP_PREPARE_WINDOW_BUFFER = MKBETAG('B','P','R','E'),

			/**
			* Display window buffer message.
			*
			* Device requests to display a window buffer.
			* Message is sent when new frame is ready to be displayed.
			* Usually buffers need to be swapped in handler of this message.
			*
			* data: NULL.
			*/
			AV_DEV_TO_APP_DISPLAY_WINDOW_BUFFER = MKBETAG('B','D','I','S'),

			/**
			* Destroy window buffer message.
			*
			* Device requests to destroy a window buffer.
			* Message is sent when device is about to be destroyed and window
			* buffer is not required anymore.
			*
			* data: NULL.
			*/
			AV_DEV_TO_APP_DESTROY_WINDOW_BUFFER = MKBETAG('B','D','E','S'),

			/**
			* Buffer fullness status messages.
			*
			* Device signals buffer overflow/underflow.
			*
			* data: NULL.
			*/
			AV_DEV_TO_APP_BUFFER_OVERFLOW = MKBETAG('B','O','F','L'),
			AV_DEV_TO_APP_BUFFER_UNDERFLOW = MKBETAG('B','U','F','L'),

			/**
			* Buffer readable/writable.
			*
			* Device informs that buffer is readable/writable.
			* When possible, device informs how many bytes can be read/write.
			*
			* @warning Device may not inform when number of bytes than can be read/write changes.
			*
			* data: int64_t: amount of bytes available to read/write.
			* NULL: amount of bytes available to read/write is not known.
			*/
			AV_DEV_TO_APP_BUFFER_READABLE = MKBETAG('B','R','D',' '),
			AV_DEV_TO_APP_BUFFER_WRITABLE = MKBETAG('B','W','R',' '),

			/**
			* Mute state change message.
			*
			* Device informs that mute state has changed.
			*
			* data: int: 0 for not muted state, non-zero for muted state.
			*/
			AV_DEV_TO_APP_MUTE_STATE_CHANGED = MKBETAG('C','M','U','T'),

			/**
			* Volume level change message.
			*
			* Device informs that volume level has changed.
			*
			* data: double: new volume with range of 0.0 - 1.0.
			*/
			AV_DEV_TO_APP_VOLUME_LEVEL_CHANGED = MKBETAG('C','V','O','L'),
			};

			/**
			* Send control message from application to device.
			*
			* @param s device context.
			* @param type message type.
			* @param data message data. Exact type depends on message type.
			* @param data_size size of message data.
			* @return >= 0 on success, negative on error.
			* AVERROR(ENOSYS) when device doesn't implement handler of the message.
			*/
			int avdevice_app_to_dev_control_message(struct AVFormatContext *s,
			enum AVAppToDevMessageType type,
			void *data, size_t data_size);

			/**
			* Send control message from device to application.
			*
			* @param s device context.
			* @param type message type.
			* @param data message data. Can be NULL.
			* @param data_size size of message data.
			* @return >= 0 on success, negative on error.
			* AVERROR(ENOSYS) when application doesn't implement handler of the message.
			*/
			int avdevice_dev_to_app_control_message(struct AVFormatContext *s,
			enum AVDevToAppMessageType type,
			void *data, size_t data_size);

			/**
			* Following API allows user to probe device capabilities (supported codecs,
			* pixel formats, sample formats, resolutions, channel counts, etc).
			* It is build on top op AVOption API.
			* Queried capabilities make it possible to set up converters of video or audio
			* parameters that fit to the device.
			*
			* List of capabilities that can be queried:
			* - Capabilities valid for both audio and video devices:
			* - codec: supported audio/video codecs.
			* type: AV_OPT_TYPE_INT (AVCodecID value)
			* - Capabilities valid for audio devices:
			* - sample_format: supported sample formats.
			* type: AV_OPT_TYPE_INT (AVSampleFormat value)
			* - sample_rate: supported sample rates.
			* type: AV_OPT_TYPE_INT
			* - channels: supported number of channels.
			* type: AV_OPT_TYPE_INT
			* - channel_layout: supported channel layouts.
			* type: AV_OPT_TYPE_INT64
			* - Capabilities valid for video devices:
			* - pixel_format: supported pixel formats.
			* type: AV_OPT_TYPE_INT (AVPixelFormat value)
			* - window_size: supported window sizes (describes size of the window size presented to the user).
			* type: AV_OPT_TYPE_IMAGE_SIZE
			* - frame_size: supported frame sizes (describes size of provided video frames).
			* type: AV_OPT_TYPE_IMAGE_SIZE
			* - fps: supported fps values
			* type: AV_OPT_TYPE_RATIONAL
			*
			* Value of the capability may be set by user using av_opt_set() function
			* and AVDeviceCapabilitiesQuery object. Following queries will
			* limit results to the values matching already set capabilities.
			* For example, setting a codec may impact number of formats or fps values
			* returned during next query. Setting invalid value may limit results to zero.
			*
			* Example of the usage basing on opengl output device:
			*
			* @code
			* AVFormatContext *oc = NULL;
			* AVDeviceCapabilitiesQuery *caps = NULL;
			* AVOptionRanges *ranges;
			* int ret;
			*
			* if ((ret = avformat_alloc_output_context2(&oc, NULL, "opengl", NULL)) < 0)
			* goto fail;
			* if (avdevice_capabilities_create(&caps, oc, NULL) < 0)
			* goto fail;
			*
			* //query codecs
			* if (av_opt_query_ranges(&ranges, caps, "codec", AV_OPT_MULTI_COMPONENT_RANGE)) < 0)
			* goto fail;
			* //pick codec here and set it
			* av_opt_set(caps, "codec", AV_CODEC_ID_RAWVIDEO, 0);
			*
			* //query format
			* if (av_opt_query_ranges(&ranges, caps, "pixel_format", AV_OPT_MULTI_COMPONENT_RANGE)) < 0)
			* goto fail;
			* //pick format here and set it
			* av_opt_set(caps, "pixel_format", AV_PIX_FMT_YUV420P, 0);
			*
			* //query and set more capabilities
			*
			* fail:
			* //clean up code
			* avdevice_capabilities_free(&query, oc);
			* avformat_free_context(oc);
			* @endcode
			*/

			/**
			* Structure describes device capabilities.
			*
			* It is used by devices in conjunction with av_device_capabilities AVOption table
			* to implement capabilities probing API based on AVOption API. Should not be used directly.
			*/
			typedef struct AVDeviceCapabilitiesQuery {
			const AVClass *av_class;
			AVFormatContext *device_context;
			enum AVCodecID codec;
			enum AVSampleFormat sample_format;
			enum AVPixelFormat pixel_format;
			int sample_rate;
			int channels;
			int64_t channel_layout;
			int window_width;
			int window_height;
			int frame_width;
			int frame_height;
			AVRational fps;
			} AVDeviceCapabilitiesQuery;

			/**
			* AVOption table used by devices to implement device capabilities API. Should not be used by a user.
			*/
			extern const AVOption av_device_capabilities[];

			/**
			* Initialize capabilities probing API based on AVOption API.
			*
			* avdevice_capabilities_free() must be called when query capabilities API is
			* not used anymore.
			*
			* @param[out] caps Device capabilities data. Pointer to a NULL pointer must be passed.
			* @param s Context of the device.
			* @param device_options An AVDictionary filled with device-private options.
			* On return this parameter will be destroyed and replaced with a dict
			* containing options that were not found. May be NULL.
			* The same options must be passed later to avformat_write_header() for output
			* devices or avformat_open_input() for input devices, or at any other place
			* that affects device-private options.
			*
			* @return >= 0 on success, negative otherwise.
			*/
			int avdevice_capabilities_create(AVDeviceCapabilitiesQuery *caps, AVFormatContext s,
			AVDictionary **device_options);

			/**
			* Free resources created by avdevice_capabilities_create()
			*
			* @param caps Device capabilities data to be freed.
			* @param s Context of the device.
			*/
			void avdevice_capabilities_free(AVDeviceCapabilitiesQuery *caps, AVFormatContext s);

			/**
			* Structure describes basic parameters of the device.
			*/
			typedef struct AVDeviceInfo {
			char device_name; /< device name, format depends on device /
			char device_description; /< human friendly name /
			} AVDeviceInfo;

			/**
			* List of devices.
			*/
			typedef struct AVDeviceInfoList {
			AVDeviceInfo devices; /< list of autodetected devices */
			int nb_devices; /*< number of autodetected devices /
			int default_device; /*< index of default device or -1 if no default /
			} AVDeviceInfoList;

			/**
			* List devices.
			*
			* Returns available device names and their parameters.
			*
			* @note: Some devices may accept system-dependent device names that cannot be
			* autodetected. The list returned by this function cannot be assumed to
			* be always completed.
			*
			* @param s device context.
			* @param[out] device_list list of autodetected devices.
			* @return count of autodetected devices, negative on error.
			*/
			int avdevice_list_devices(struct AVFormatContext s, AVDeviceInfoList *device_list);

			/**
			* Convenient function to free result of avdevice_list_devices().
			*
			* @param devices device list to be freed.
			*/
			void avdevice_free_list_devices(AVDeviceInfoList **device_list);

			/**
			* List devices.
			*
			* Returns available device names and their parameters.
			* These are convinient wrappers for avdevice_list_devices().
			* Device context is allocated and deallocated internally.
			*
			* @param device device format. May be NULL if device name is set.
			* @param device_name device name. May be NULL if device format is set.
			* @param device_options An AVDictionary filled with device-private options. May be NULL.
			* The same options must be passed later to avformat_write_header() for output
			* devices or avformat_open_input() for input devices, or at any other place
			* that affects device-private options.
			* @param[out] device_list list of autodetected devices
			* @return count of autodetected devices, negative on error.
			* @note device argument takes precedence over device_name when both are set.
			*/
			int avdevice_list_input_sources(struct AVInputFormat device, const char device_name,
			AVDictionary device_options, AVDeviceInfoList *device_list);
			int avdevice_list_output_sinks(struct AVOutputFormat device, const char device_name,
			AVDictionary device_options, AVDeviceInfoList *device_list);

			/**
			* @}
			*/

			#endif /* AVDEVICE_AVDEVICE_H */