FFmpeg
avdevice.h
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1 /*
2  * This file is part of FFmpeg.
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5  * modify it under the terms of the GNU Lesser General Public
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8  *
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12  * Lesser General Public License for more details.
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17  */
18 
19 #ifndef AVDEVICE_AVDEVICE_H
20 #define AVDEVICE_AVDEVICE_H
21 
22 #include "version_major.h"
23 #ifndef HAVE_AV_CONFIG_H
24 /* When included as part of the ffmpeg build, only include the major version
25  * to avoid unnecessary rebuilds. When included externally, keep including
26  * the full version information. */
27 #include "version.h"
28 #endif
29 
30 /**
31  * @file
32  * @ingroup lavd
33  * Main libavdevice API header
34  */
35 
36 /**
37  * @defgroup lavd libavdevice
38  * Special devices muxing/demuxing library.
39  *
40  * Libavdevice is a complementary library to @ref libavf "libavformat". It
41  * provides various "special" platform-specific muxers and demuxers, e.g. for
42  * grabbing devices, audio capture and playback etc. As a consequence, the
43  * (de)muxers in libavdevice are of the AVFMT_NOFILE type (they use their own
44  * I/O functions). The filename passed to avformat_open_input() often does not
45  * refer to an actually existing file, but has some special device-specific
46  * meaning - e.g. for xcbgrab it is the display name.
47  *
48  * To use libavdevice, simply call avdevice_register_all() to register all
49  * compiled muxers and demuxers. They all use standard libavformat API.
50  *
51  * @{
52  */
53 
54 #include "libavutil/log.h"
55 #include "libavutil/opt.h"
56 #include "libavutil/dict.h"
57 #include "libavformat/avformat.h"
58 
59 /**
60  * Return the LIBAVDEVICE_VERSION_INT constant.
61  */
62 unsigned avdevice_version(void);
63 
64 /**
65  * Return the libavdevice build-time configuration.
66  */
67 const char *avdevice_configuration(void);
68 
69 /**
70  * Return the libavdevice license.
71  */
72 const char *avdevice_license(void);
73 
74 /**
75  * Initialize libavdevice and register all the input and output devices.
76  */
77 void avdevice_register_all(void);
78 
79 /**
80  * Audio input devices iterator.
81  *
82  * If d is NULL, returns the first registered input audio/video device,
83  * if d is non-NULL, returns the next registered input audio/video device after d
84  * or NULL if d is the last one.
85  */
87 
88 /**
89  * Video input devices iterator.
90  *
91  * If d is NULL, returns the first registered input audio/video device,
92  * if d is non-NULL, returns the next registered input audio/video device after d
93  * or NULL if d is the last one.
94  */
96 
97 /**
98  * Audio output devices iterator.
99  *
100  * If d is NULL, returns the first registered output audio/video device,
101  * if d is non-NULL, returns the next registered output audio/video device after d
102  * or NULL if d is the last one.
103  */
105 
106 /**
107  * Video output devices iterator.
108  *
109  * If d is NULL, returns the first registered output audio/video device,
110  * if d is non-NULL, returns the next registered output audio/video device after d
111  * or NULL if d is the last one.
112  */
114 
115 typedef struct AVDeviceRect {
116  int x; /**< x coordinate of top left corner */
117  int y; /**< y coordinate of top left corner */
118  int width; /**< width */
119  int height; /**< height */
120 } AVDeviceRect;
121 
122 /**
123  * Message types used by avdevice_app_to_dev_control_message().
124  */
126  /**
127  * Dummy message.
128  */
129  AV_APP_TO_DEV_NONE = MKBETAG('N','O','N','E'),
130 
131  /**
132  * Window size change message.
133  *
134  * Message is sent to the device every time the application changes the size
135  * of the window device renders to.
136  * Message should also be sent right after window is created.
137  *
138  * data: AVDeviceRect: new window size.
139  */
140  AV_APP_TO_DEV_WINDOW_SIZE = MKBETAG('G','E','O','M'),
141 
142  /**
143  * Repaint request message.
144  *
145  * Message is sent to the device when window has to be repainted.
146  *
147  * data: AVDeviceRect: area required to be repainted.
148  * NULL: whole area is required to be repainted.
149  */
151 
152  /**
153  * Request pause/play.
154  *
155  * Application requests pause/unpause playback.
156  * Mostly usable with devices that have internal buffer.
157  * By default devices are not paused.
158  *
159  * data: NULL
160  */
161  AV_APP_TO_DEV_PAUSE = MKBETAG('P', 'A', 'U', ' '),
162  AV_APP_TO_DEV_PLAY = MKBETAG('P', 'L', 'A', 'Y'),
163  AV_APP_TO_DEV_TOGGLE_PAUSE = MKBETAG('P', 'A', 'U', 'T'),
164 
165  /**
166  * Volume control message.
167  *
168  * Set volume level. It may be device-dependent if volume
169  * is changed per stream or system wide. Per stream volume
170  * change is expected when possible.
171  *
172  * data: double: new volume with range of 0.0 - 1.0.
173  */
174  AV_APP_TO_DEV_SET_VOLUME = MKBETAG('S', 'V', 'O', 'L'),
175 
176  /**
177  * Mute control messages.
178  *
179  * Change mute state. It may be device-dependent if mute status
180  * is changed per stream or system wide. Per stream mute status
181  * change is expected when possible.
182  *
183  * data: NULL.
184  */
185  AV_APP_TO_DEV_MUTE = MKBETAG(' ', 'M', 'U', 'T'),
186  AV_APP_TO_DEV_UNMUTE = MKBETAG('U', 'M', 'U', 'T'),
187  AV_APP_TO_DEV_TOGGLE_MUTE = MKBETAG('T', 'M', 'U', 'T'),
188 
189  /**
190  * Get volume/mute messages.
191  *
192  * Force the device to send AV_DEV_TO_APP_VOLUME_LEVEL_CHANGED or
193  * AV_DEV_TO_APP_MUTE_STATE_CHANGED command respectively.
194  *
195  * data: NULL.
196  */
197  AV_APP_TO_DEV_GET_VOLUME = MKBETAG('G', 'V', 'O', 'L'),
198  AV_APP_TO_DEV_GET_MUTE = MKBETAG('G', 'M', 'U', 'T'),
199 };
200 
201 /**
202  * Message types used by avdevice_dev_to_app_control_message().
203  */
205  /**
206  * Dummy message.
207  */
208  AV_DEV_TO_APP_NONE = MKBETAG('N','O','N','E'),
209 
210  /**
211  * Create window buffer message.
212  *
213  * Device requests to create a window buffer. Exact meaning is device-
214  * and application-dependent. Message is sent before rendering first
215  * frame and all one-shot initializations should be done here.
216  * Application is allowed to ignore preferred window buffer size.
217  *
218  * @note: Application is obligated to inform about window buffer size
219  * with AV_APP_TO_DEV_WINDOW_SIZE message.
220  *
221  * data: AVDeviceRect: preferred size of the window buffer.
222  * NULL: no preferred size of the window buffer.
223  */
225 
226  /**
227  * Prepare window buffer message.
228  *
229  * Device requests to prepare a window buffer for rendering.
230  * Exact meaning is device- and application-dependent.
231  * Message is sent before rendering of each frame.
232  *
233  * data: NULL.
234  */
236 
237  /**
238  * Display window buffer message.
239  *
240  * Device requests to display a window buffer.
241  * Message is sent when new frame is ready to be displayed.
242  * Usually buffers need to be swapped in handler of this message.
243  *
244  * data: NULL.
245  */
247 
248  /**
249  * Destroy window buffer message.
250  *
251  * Device requests to destroy a window buffer.
252  * Message is sent when device is about to be destroyed and window
253  * buffer is not required anymore.
254  *
255  * data: NULL.
256  */
258 
259  /**
260  * Buffer fullness status messages.
261  *
262  * Device signals buffer overflow/underflow.
263  *
264  * data: NULL.
265  */
268 
269  /**
270  * Buffer readable/writable.
271  *
272  * Device informs that buffer is readable/writable.
273  * When possible, device informs how many bytes can be read/write.
274  *
275  * @warning Device may not inform when number of bytes than can be read/write changes.
276  *
277  * data: int64_t: amount of bytes available to read/write.
278  * NULL: amount of bytes available to read/write is not known.
279  */
282 
283  /**
284  * Mute state change message.
285  *
286  * Device informs that mute state has changed.
287  *
288  * data: int: 0 for not muted state, non-zero for muted state.
289  */
291 
292  /**
293  * Volume level change message.
294  *
295  * Device informs that volume level has changed.
296  *
297  * data: double: new volume with range of 0.0 - 1.0.
298  */
300 };
301 
302 /**
303  * Send control message from application to device.
304  *
305  * @param s device context.
306  * @param type message type.
307  * @param data message data. Exact type depends on message type.
308  * @param data_size size of message data.
309  * @return >= 0 on success, negative on error.
310  * AVERROR(ENOSYS) when device doesn't implement handler of the message.
311  */
314  void *data, size_t data_size);
315 
316 /**
317  * Send control message from device to application.
318  *
319  * @param s device context.
320  * @param type message type.
321  * @param data message data. Can be NULL.
322  * @param data_size size of message data.
323  * @return >= 0 on success, negative on error.
324  * AVERROR(ENOSYS) when application doesn't implement handler of the message.
325  */
328  void *data, size_t data_size);
329 
330 #if FF_API_DEVICE_CAPABILITIES
331 /**
332  * Following API allows user to probe device capabilities (supported codecs,
333  * pixel formats, sample formats, resolutions, channel counts, etc).
334  * It is build on top op AVOption API.
335  * Queried capabilities make it possible to set up converters of video or audio
336  * parameters that fit to the device.
337  *
338  * List of capabilities that can be queried:
339  * - Capabilities valid for both audio and video devices:
340  * - codec: supported audio/video codecs.
341  * type: AV_OPT_TYPE_INT (AVCodecID value)
342  * - Capabilities valid for audio devices:
343  * - sample_format: supported sample formats.
344  * type: AV_OPT_TYPE_INT (AVSampleFormat value)
345  * - sample_rate: supported sample rates.
346  * type: AV_OPT_TYPE_INT
347  * - channels: supported number of channels.
348  * type: AV_OPT_TYPE_INT
349  * - channel_layout: supported channel layouts.
350  * type: AV_OPT_TYPE_INT64
351  * - Capabilities valid for video devices:
352  * - pixel_format: supported pixel formats.
353  * type: AV_OPT_TYPE_INT (AVPixelFormat value)
354  * - window_size: supported window sizes (describes size of the window size presented to the user).
355  * type: AV_OPT_TYPE_IMAGE_SIZE
356  * - frame_size: supported frame sizes (describes size of provided video frames).
357  * type: AV_OPT_TYPE_IMAGE_SIZE
358  * - fps: supported fps values
359  * type: AV_OPT_TYPE_RATIONAL
360  *
361  * Value of the capability may be set by user using av_opt_set() function
362  * and AVDeviceCapabilitiesQuery object. Following queries will
363  * limit results to the values matching already set capabilities.
364  * For example, setting a codec may impact number of formats or fps values
365  * returned during next query. Setting invalid value may limit results to zero.
366  *
367  * Example of the usage basing on opengl output device:
368  *
369  * @code
370  * AVFormatContext *oc = NULL;
371  * AVDeviceCapabilitiesQuery *caps = NULL;
372  * AVOptionRanges *ranges;
373  * int ret;
374  *
375  * if ((ret = avformat_alloc_output_context2(&oc, NULL, "opengl", NULL)) < 0)
376  * goto fail;
377  * if (avdevice_capabilities_create(&caps, oc, NULL) < 0)
378  * goto fail;
379  *
380  * //query codecs
381  * if (av_opt_query_ranges(&ranges, caps, "codec", AV_OPT_MULTI_COMPONENT_RANGE)) < 0)
382  * goto fail;
383  * //pick codec here and set it
384  * av_opt_set(caps, "codec", AV_CODEC_ID_RAWVIDEO, 0);
385  *
386  * //query format
387  * if (av_opt_query_ranges(&ranges, caps, "pixel_format", AV_OPT_MULTI_COMPONENT_RANGE)) < 0)
388  * goto fail;
389  * //pick format here and set it
390  * av_opt_set(caps, "pixel_format", AV_PIX_FMT_YUV420P, 0);
391  *
392  * //query and set more capabilities
393  *
394  * fail:
395  * //clean up code
396  * avdevice_capabilities_free(&query, oc);
397  * avformat_free_context(oc);
398  * @endcode
399  */
400 
401 /**
402  * Structure describes device capabilities.
403  *
404  * It is used by devices in conjunction with av_device_capabilities AVOption table
405  * to implement capabilities probing API based on AVOption API. Should not be used directly.
406  */
414  int channels;
415  int64_t channel_layout;
422 
423 /**
424  * AVOption table used by devices to implement device capabilities API. Should not be used by a user.
425  */
427 extern const AVOption av_device_capabilities[];
428 
429 /**
430  * Initialize capabilities probing API based on AVOption API.
431  *
432  * avdevice_capabilities_free() must be called when query capabilities API is
433  * not used anymore.
434  *
435  * @param[out] caps Device capabilities data. Pointer to a NULL pointer must be passed.
436  * @param s Context of the device.
437  * @param device_options An AVDictionary filled with device-private options.
438  * On return this parameter will be destroyed and replaced with a dict
439  * containing options that were not found. May be NULL.
440  * The same options must be passed later to avformat_write_header() for output
441  * devices or avformat_open_input() for input devices, or at any other place
442  * that affects device-private options.
443  *
444  * @return >= 0 on success, negative otherwise.
445  */
448  AVDictionary **device_options);
449 
450 /**
451  * Free resources created by avdevice_capabilities_create()
452  *
453  * @param caps Device capabilities data to be freed.
454  * @param s Context of the device.
455  */
458 #endif
459 
460 /**
461  * Structure describes basic parameters of the device.
462  */
463 typedef struct AVDeviceInfo {
464  char *device_name; /**< device name, format depends on device */
465  char *device_description; /**< human friendly name */
466  enum AVMediaType *media_types; /**< array indicating what media types(s), if any, a device can provide. If null, cannot provide any */
467  int nb_media_types; /**< length of media_types array, 0 if device cannot provide any media types */
468 } AVDeviceInfo;
469 
470 /**
471  * List of devices.
472  */
473 typedef struct AVDeviceInfoList {
474  AVDeviceInfo **devices; /**< list of autodetected devices */
475  int nb_devices; /**< number of autodetected devices */
476  int default_device; /**< index of default device or -1 if no default */
478 
479 /**
480  * List devices.
481  *
482  * Returns available device names and their parameters.
483  *
484  * @note: Some devices may accept system-dependent device names that cannot be
485  * autodetected. The list returned by this function cannot be assumed to
486  * be always completed.
487  *
488  * @param s device context.
489  * @param[out] device_list list of autodetected devices.
490  * @return count of autodetected devices, negative on error.
491  */
492 int avdevice_list_devices(struct AVFormatContext *s, AVDeviceInfoList **device_list);
493 
494 /**
495  * Convenient function to free result of avdevice_list_devices().
496  *
497  * @param devices device list to be freed.
498  */
499 void avdevice_free_list_devices(AVDeviceInfoList **device_list);
500 
501 /**
502  * List devices.
503  *
504  * Returns available device names and their parameters.
505  * These are convinient wrappers for avdevice_list_devices().
506  * Device context is allocated and deallocated internally.
507  *
508  * @param device device format. May be NULL if device name is set.
509  * @param device_name device name. May be NULL if device format is set.
510  * @param device_options An AVDictionary filled with device-private options. May be NULL.
511  * The same options must be passed later to avformat_write_header() for output
512  * devices or avformat_open_input() for input devices, or at any other place
513  * that affects device-private options.
514  * @param[out] device_list list of autodetected devices
515  * @return count of autodetected devices, negative on error.
516  * @note device argument takes precedence over device_name when both are set.
517  */
518 int avdevice_list_input_sources(const AVInputFormat *device, const char *device_name,
519  AVDictionary *device_options, AVDeviceInfoList **device_list);
520 int avdevice_list_output_sinks(const AVOutputFormat *device, const char *device_name,
521  AVDictionary *device_options, AVDeviceInfoList **device_list);
522 
523 /**
524  * @}
525  */
526 
527 #endif /* AVDEVICE_AVDEVICE_H */
AVPixelFormat
AVPixelFormat
Pixel format.
Definition: pixfmt.h:64
AVDeviceCapabilitiesQuery::pixel_format
enum AVPixelFormat pixel_format
Definition: avdevice.h:412
AV_APP_TO_DEV_MUTE
@ AV_APP_TO_DEV_MUTE
Mute control messages.
Definition: avdevice.h:185
opt.h
AV_APP_TO_DEV_SET_VOLUME
@ AV_APP_TO_DEV_SET_VOLUME
Volume control message.
Definition: avdevice.h:174
AV_DEV_TO_APP_BUFFER_OVERFLOW
@ AV_DEV_TO_APP_BUFFER_OVERFLOW
Buffer fullness status messages.
Definition: avdevice.h:266
AVDeviceCapabilitiesQuery::device_context
AVFormatContext * device_context
Definition: avdevice.h:409
AVDeviceInfo::device_name
char * device_name
device name, format depends on device
Definition: avdevice.h:464
AVDeviceCapabilitiesQuery
Following API allows user to probe device capabilities (supported codecs, pixel formats,...
Definition: avdevice.h:407
AVDeviceInfoList::nb_devices
int nb_devices
number of autodetected devices
Definition: avdevice.h:475
AV_DEV_TO_APP_PREPARE_WINDOW_BUFFER
@ AV_DEV_TO_APP_PREPARE_WINDOW_BUFFER
Prepare window buffer message.
Definition: avdevice.h:235
avdevice_list_devices
int avdevice_list_devices(struct AVFormatContext *s, AVDeviceInfoList **device_list)
List devices.
Definition: avdevice.c:58
av_device_capabilities
const attribute_deprecated AVOption av_device_capabilities[]
AVOption table used by devices to implement device capabilities API.
Definition: avdevice.c:24
avdevice_capabilities_create
attribute_deprecated int avdevice_capabilities_create(AVDeviceCapabilitiesQuery **caps, AVFormatContext *s, AVDictionary **device_options)
Initialize capabilities probing API based on AVOption API.
Definition: avdevice.c:46
AVDeviceCapabilitiesQuery::sample_format
enum AVSampleFormat sample_format
Definition: avdevice.h:411
AVOption
AVOption.
Definition: opt.h:251
AVAppToDevMessageType
AVAppToDevMessageType
Message types used by avdevice_app_to_dev_control_message().
Definition: avdevice.h:125
data
const char data[16]
Definition: mxf.c:143
avdevice_dev_to_app_control_message
int avdevice_dev_to_app_control_message(struct AVFormatContext *s, enum AVDevToAppMessageType type, void *data, size_t data_size)
Send control message from device to application.
Definition: avdevice.c:37
AV_APP_TO_DEV_PAUSE
@ AV_APP_TO_DEV_PAUSE
Request pause/play.
Definition: avdevice.h:161
AVDictionary
Definition: dict.c:30
AV_APP_TO_DEV_GET_MUTE
@ AV_APP_TO_DEV_GET_MUTE
Definition: avdevice.h:198
AVDeviceCapabilitiesQuery::window_width
int window_width
Definition: avdevice.h:416
AV_APP_TO_DEV_WINDOW_REPAINT
@ AV_APP_TO_DEV_WINDOW_REPAINT
Repaint request message.
Definition: avdevice.h:150
AV_DEV_TO_APP_MUTE_STATE_CHANGED
@ AV_DEV_TO_APP_MUTE_STATE_CHANGED
Mute state change message.
Definition: avdevice.h:290
av_input_audio_device_next
const AVInputFormat * av_input_audio_device_next(const AVInputFormat *d)
Audio input devices iterator.
Definition: alldevices.c:121
avdevice_list_output_sinks
int avdevice_list_output_sinks(const AVOutputFormat *device, const char *device_name, AVDictionary *device_options, AVDeviceInfoList **device_list)
Definition: avdevice.c:110
type
it s the only field you need to keep assuming you have a context There is some magic you don t need to care about around this just let it vf type
Definition: writing_filters.txt:86
AV_APP_TO_DEV_UNMUTE
@ AV_APP_TO_DEV_UNMUTE
Definition: avdevice.h:186
AVDeviceInfoList::devices
AVDeviceInfo ** devices
list of autodetected devices
Definition: avdevice.h:474
AVInputFormat
Definition: avformat.h:656
avdevice_list_input_sources
int avdevice_list_input_sources(const AVInputFormat *device, const char *device_name, AVDictionary *device_options, AVDeviceInfoList **device_list)
List devices.
Definition: avdevice.c:99
AV_APP_TO_DEV_TOGGLE_PAUSE
@ AV_APP_TO_DEV_TOGGLE_PAUSE
Definition: avdevice.h:163
AV_DEV_TO_APP_DISPLAY_WINDOW_BUFFER
@ AV_DEV_TO_APP_DISPLAY_WINDOW_BUFFER
Display window buffer message.
Definition: avdevice.h:246
s
#define s(width, name)
Definition: cbs_vp9.c:256
AV_DEV_TO_APP_CREATE_WINDOW_BUFFER
@ AV_DEV_TO_APP_CREATE_WINDOW_BUFFER
Create window buffer message.
Definition: avdevice.h:224
avdevice_license
const char * avdevice_license(void)
Return the libavdevice license.
Definition: version.c:41
version_major.h
AVDeviceInfo::media_types
enum AVMediaType * media_types
array indicating what media types(s), if any, a device can provide.
Definition: avdevice.h:466
AVDeviceInfo::nb_media_types
int nb_media_types
length of media_types array, 0 if device cannot provide any media types
Definition: avdevice.h:467
AVFormatContext
Format I/O context.
Definition: avformat.h:1213
AVClass
Describe the class of an AVClass context structure.
Definition: log.h:66
AV_APP_TO_DEV_GET_VOLUME
@ AV_APP_TO_DEV_GET_VOLUME
Get volume/mute messages.
Definition: avdevice.h:197
AVRational
Rational number (pair of numerator and denominator).
Definition: rational.h:58
avdevice_configuration
const char * avdevice_configuration(void)
Return the libavdevice build-time configuration.
Definition: version.c:36
avdevice_capabilities_free
attribute_deprecated void avdevice_capabilities_free(AVDeviceCapabilitiesQuery **caps, AVFormatContext *s)
Free resources created by avdevice_capabilities_create()
Definition: avdevice.c:52
AVCodecID
AVCodecID
Identify the syntax and semantics of the bitstream.
Definition: codec_id.h:47
AVDeviceCapabilitiesQuery::frame_width
int frame_width
Definition: avdevice.h:418
AVDeviceRect::y
int y
y coordinate of top left corner
Definition: avdevice.h:117
AV_APP_TO_DEV_NONE
@ AV_APP_TO_DEV_NONE
Dummy message.
Definition: avdevice.h:129
AVMediaType
AVMediaType
Definition: avutil.h:199
AV_DEV_TO_APP_BUFFER_READABLE
@ AV_DEV_TO_APP_BUFFER_READABLE
Buffer readable/writable.
Definition: avdevice.h:280
AV_APP_TO_DEV_PLAY
@ AV_APP_TO_DEV_PLAY
Definition: avdevice.h:162
av_output_video_device_next
const AVOutputFormat * av_output_video_device_next(const AVOutputFormat *d)
Video output devices iterator.
Definition: alldevices.c:136
MKBETAG
#define MKBETAG(a, b, c, d)
Definition: macros.h:56
AVDeviceInfo
Structure describes basic parameters of the device.
Definition: avdevice.h:463
avdevice_free_list_devices
void avdevice_free_list_devices(AVDeviceInfoList **device_list)
Convenient function to free result of avdevice_list_devices().
Definition: avdevice.c:121
attribute_deprecated
#define attribute_deprecated
Definition: attributes.h:104
AV_APP_TO_DEV_TOGGLE_MUTE
@ AV_APP_TO_DEV_TOGGLE_MUTE
Definition: avdevice.h:187
AVDevToAppMessageType
AVDevToAppMessageType
Message types used by avdevice_dev_to_app_control_message().
Definition: avdevice.h:204
AVDeviceInfo::device_description
char * device_description
human friendly name
Definition: avdevice.h:465
AVDeviceRect::x
int x
x coordinate of top left corner
Definition: avdevice.h:116
avdevice_version
unsigned avdevice_version(void)
Return the LIBAVDEVICE_VERSION_INT constant.
Definition: version.c:30
AVDeviceRect
Definition: avdevice.h:115
log.h
AVOutputFormat
Definition: avformat.h:509
AVSampleFormat
AVSampleFormat
Audio sample formats.
Definition: samplefmt.h:55
AVDeviceCapabilitiesQuery::frame_height
int frame_height
Definition: avdevice.h:419
AVDeviceCapabilitiesQuery::channel_layout
int64_t channel_layout
Definition: avdevice.h:415
AV_APP_TO_DEV_WINDOW_SIZE
@ AV_APP_TO_DEV_WINDOW_SIZE
Window size change message.
Definition: avdevice.h:140
AVDeviceCapabilitiesQuery::channels
int channels
Definition: avdevice.h:414
AVDeviceInfoList
List of devices.
Definition: avdevice.h:473
avformat.h
dict.h
AVDeviceRect::height
int height
height
Definition: avdevice.h:119
AVDeviceCapabilitiesQuery::av_class
const AVClass * av_class
Definition: avdevice.h:408
AVDeviceInfoList::default_device
int default_device
index of default device or -1 if no default
Definition: avdevice.h:476
avdevice_app_to_dev_control_message
int avdevice_app_to_dev_control_message(struct AVFormatContext *s, enum AVAppToDevMessageType type, void *data, size_t data_size)
Send control message from application to device.
Definition: avdevice.c:29
AVDeviceCapabilitiesQuery::sample_rate
int sample_rate
Definition: avdevice.h:413
av_output_audio_device_next
const AVOutputFormat * av_output_audio_device_next(const AVOutputFormat *d)
Audio output devices iterator.
Definition: alldevices.c:131
AV_DEV_TO_APP_VOLUME_LEVEL_CHANGED
@ AV_DEV_TO_APP_VOLUME_LEVEL_CHANGED
Volume level change message.
Definition: avdevice.h:299
AV_DEV_TO_APP_BUFFER_WRITABLE
@ AV_DEV_TO_APP_BUFFER_WRITABLE
Definition: avdevice.h:281
d
d
Definition: ffmpeg_filter.c:153
AV_DEV_TO_APP_NONE
@ AV_DEV_TO_APP_NONE
Dummy message.
Definition: avdevice.h:208
AV_DEV_TO_APP_DESTROY_WINDOW_BUFFER
@ AV_DEV_TO_APP_DESTROY_WINDOW_BUFFER
Destroy window buffer message.
Definition: avdevice.h:257
av_input_video_device_next
const AVInputFormat * av_input_video_device_next(const AVInputFormat *d)
Video input devices iterator.
Definition: alldevices.c:126
AV_DEV_TO_APP_BUFFER_UNDERFLOW
@ AV_DEV_TO_APP_BUFFER_UNDERFLOW
Definition: avdevice.h:267
AVDeviceCapabilitiesQuery::fps
AVRational fps
Definition: avdevice.h:420
AVDeviceCapabilitiesQuery::window_height
int window_height
Definition: avdevice.h:417
AVDeviceRect::width
int width
width
Definition: avdevice.h:118
avdevice_register_all
void avdevice_register_all(void)
Initialize libavdevice and register all the input and output devices.
Definition: alldevices.c:64
AVDeviceCapabilitiesQuery::codec
enum AVCodecID codec
Definition: avdevice.h:410