FFmpeg
hwcontext.h
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18 
19 #ifndef AVUTIL_HWCONTEXT_H
20 #define AVUTIL_HWCONTEXT_H
21 
22 #include "buffer.h"
23 #include "frame.h"
24 #include "log.h"
25 #include "pixfmt.h"
26 
39 };
40 
42 
43 /**
44  * This struct aggregates all the (hardware/vendor-specific) "high-level" state,
45  * i.e. state that is not tied to a concrete processing configuration.
46  * E.g., in an API that supports hardware-accelerated encoding and decoding,
47  * this struct will (if possible) wrap the state that is common to both encoding
48  * and decoding and from which specific instances of encoders or decoders can be
49  * derived.
50  *
51  * This struct is reference-counted with the AVBuffer mechanism. The
52  * av_hwdevice_ctx_alloc() constructor yields a reference, whose data field
53  * points to the actual AVHWDeviceContext. Further objects derived from
54  * AVHWDeviceContext (such as AVHWFramesContext, describing a frame pool with
55  * specific properties) will hold an internal reference to it. After all the
56  * references are released, the AVHWDeviceContext itself will be freed,
57  * optionally invoking a user-specified callback for uninitializing the hardware
58  * state.
59  */
60 typedef struct AVHWDeviceContext {
61  /**
62  * A class for logging. Set by av_hwdevice_ctx_alloc().
63  */
64  const AVClass *av_class;
65 
66  /**
67  * Private data used internally by libavutil. Must not be accessed in any
68  * way by the caller.
69  */
70  AVHWDeviceInternal *internal;
71 
72  /**
73  * This field identifies the underlying API used for hardware access.
74  *
75  * This field is set when this struct is allocated and never changed
76  * afterwards.
77  */
79 
80  /**
81  * The format-specific data, allocated and freed by libavutil along with
82  * this context.
83  *
84  * Should be cast by the user to the format-specific context defined in the
85  * corresponding header (hwcontext_*.h) and filled as described in the
86  * documentation before calling av_hwdevice_ctx_init().
87  *
88  * After calling av_hwdevice_ctx_init() this struct should not be modified
89  * by the caller.
90  */
91  void *hwctx;
92 
93  /**
94  * This field may be set by the caller before calling av_hwdevice_ctx_init().
95  *
96  * If non-NULL, this callback will be called when the last reference to
97  * this context is unreferenced, immediately before it is freed.
98  *
99  * @note when other objects (e.g an AVHWFramesContext) are derived from this
100  * struct, this callback will be invoked after all such child objects
101  * are fully uninitialized and their respective destructors invoked.
102  */
104 
105  /**
106  * Arbitrary user data, to be used e.g. by the free() callback.
107  */
108  void *user_opaque;
110 
112 
113 /**
114  * This struct describes a set or pool of "hardware" frames (i.e. those with
115  * data not located in normal system memory). All the frames in the pool are
116  * assumed to be allocated in the same way and interchangeable.
117  *
118  * This struct is reference-counted with the AVBuffer mechanism and tied to a
119  * given AVHWDeviceContext instance. The av_hwframe_ctx_alloc() constructor
120  * yields a reference, whose data field points to the actual AVHWFramesContext
121  * struct.
122  */
123 typedef struct AVHWFramesContext {
124  /**
125  * A class for logging.
126  */
128 
129  /**
130  * Private data used internally by libavutil. Must not be accessed in any
131  * way by the caller.
132  */
134 
135  /**
136  * A reference to the parent AVHWDeviceContext. This reference is owned and
137  * managed by the enclosing AVHWFramesContext, but the caller may derive
138  * additional references from it.
139  */
141 
142  /**
143  * The parent AVHWDeviceContext. This is simply a pointer to
144  * device_ref->data provided for convenience.
145  *
146  * Set by libavutil in av_hwframe_ctx_init().
147  */
149 
150  /**
151  * The format-specific data, allocated and freed automatically along with
152  * this context.
153  *
154  * Should be cast by the user to the format-specific context defined in the
155  * corresponding header (hwframe_*.h) and filled as described in the
156  * documentation before calling av_hwframe_ctx_init().
157  *
158  * After any frames using this context are created, the contents of this
159  * struct should not be modified by the caller.
160  */
161  void *hwctx;
162 
163  /**
164  * This field may be set by the caller before calling av_hwframe_ctx_init().
165  *
166  * If non-NULL, this callback will be called when the last reference to
167  * this context is unreferenced, immediately before it is freed.
168  */
170 
171  /**
172  * Arbitrary user data, to be used e.g. by the free() callback.
173  */
174  void *user_opaque;
175 
176  /**
177  * A pool from which the frames are allocated by av_hwframe_get_buffer().
178  * This field may be set by the caller before calling av_hwframe_ctx_init().
179  * The buffers returned by calling av_buffer_pool_get() on this pool must
180  * have the properties described in the documentation in the corresponding hw
181  * type's header (hwcontext_*.h). The pool will be freed strictly before
182  * this struct's free() callback is invoked.
183  *
184  * This field may be NULL, then libavutil will attempt to allocate a pool
185  * internally. Note that certain device types enforce pools allocated at
186  * fixed size (frame count), which cannot be extended dynamically. In such a
187  * case, initial_pool_size must be set appropriately.
188  */
190 
191  /**
192  * Initial size of the frame pool. If a device type does not support
193  * dynamically resizing the pool, then this is also the maximum pool size.
194  *
195  * May be set by the caller before calling av_hwframe_ctx_init(). Must be
196  * set if pool is NULL and the device type does not support dynamic pools.
197  */
199 
200  /**
201  * The pixel format identifying the underlying HW surface type.
202  *
203  * Must be a hwaccel format, i.e. the corresponding descriptor must have the
204  * AV_PIX_FMT_FLAG_HWACCEL flag set.
205  *
206  * Must be set by the user before calling av_hwframe_ctx_init().
207  */
209 
210  /**
211  * The pixel format identifying the actual data layout of the hardware
212  * frames.
213  *
214  * Must be set by the caller before calling av_hwframe_ctx_init().
215  *
216  * @note when the underlying API does not provide the exact data layout, but
217  * only the colorspace/bit depth, this field should be set to the fully
218  * planar version of that format (e.g. for 8-bit 420 YUV it should be
219  * AV_PIX_FMT_YUV420P, not AV_PIX_FMT_NV12 or anything else).
220  */
222 
223  /**
224  * The allocated dimensions of the frames in this pool.
225  *
226  * Must be set by the user before calling av_hwframe_ctx_init().
227  */
228  int width, height;
230 
231 /**
232  * Look up an AVHWDeviceType by name.
233  *
234  * @param name String name of the device type (case-insensitive).
235  * @return The type from enum AVHWDeviceType, or AV_HWDEVICE_TYPE_NONE if
236  * not found.
237  */
239 
240 /** Get the string name of an AVHWDeviceType.
241  *
242  * @param type Type from enum AVHWDeviceType.
243  * @return Pointer to a static string containing the name, or NULL if the type
244  * is not valid.
245  */
247 
248 /**
249  * Iterate over supported device types.
250  *
251  * @param type AV_HWDEVICE_TYPE_NONE initially, then the previous type
252  * returned by this function in subsequent iterations.
253  * @return The next usable device type from enum AVHWDeviceType, or
254  * AV_HWDEVICE_TYPE_NONE if there are no more.
255  */
257 
258 /**
259  * Allocate an AVHWDeviceContext for a given hardware type.
260  *
261  * @param type the type of the hardware device to allocate.
262  * @return a reference to the newly created AVHWDeviceContext on success or NULL
263  * on failure.
264  */
266 
267 /**
268  * Finalize the device context before use. This function must be called after
269  * the context is filled with all the required information and before it is
270  * used in any way.
271  *
272  * @param ref a reference to the AVHWDeviceContext
273  * @return 0 on success, a negative AVERROR code on failure
274  */
276 
277 /**
278  * Open a device of the specified type and create an AVHWDeviceContext for it.
279  *
280  * This is a convenience function intended to cover the simple cases. Callers
281  * who need to fine-tune device creation/management should open the device
282  * manually and then wrap it in an AVHWDeviceContext using
283  * av_hwdevice_ctx_alloc()/av_hwdevice_ctx_init().
284  *
285  * The returned context is already initialized and ready for use, the caller
286  * should not call av_hwdevice_ctx_init() on it. The user_opaque/free fields of
287  * the created AVHWDeviceContext are set by this function and should not be
288  * touched by the caller.
289  *
290  * @param device_ctx On success, a reference to the newly-created device context
291  * will be written here. The reference is owned by the caller
292  * and must be released with av_buffer_unref() when no longer
293  * needed. On failure, NULL will be written to this pointer.
294  * @param type The type of the device to create.
295  * @param device A type-specific string identifying the device to open.
296  * @param opts A dictionary of additional (type-specific) options to use in
297  * opening the device. The dictionary remains owned by the caller.
298  * @param flags currently unused
299  *
300  * @return 0 on success, a negative AVERROR code on failure.
301  */
303  const char *device, AVDictionary *opts, int flags);
304 
305 /**
306  * Create a new device of the specified type from an existing device.
307  *
308  * If the source device is a device of the target type or was originally
309  * derived from such a device (possibly through one or more intermediate
310  * devices of other types), then this will return a reference to the
311  * existing device of the same type as is requested.
312  *
313  * Otherwise, it will attempt to derive a new device from the given source
314  * device. If direct derivation to the new type is not implemented, it will
315  * attempt the same derivation from each ancestor of the source device in
316  * turn looking for an implemented derivation method.
317  *
318  * @param dst_ctx On success, a reference to the newly-created
319  * AVHWDeviceContext.
320  * @param type The type of the new device to create.
321  * @param src_ctx A reference to an existing AVHWDeviceContext which will be
322  * used to create the new device.
323  * @param flags Currently unused; should be set to zero.
324  * @return Zero on success, a negative AVERROR code on failure.
325  */
327  enum AVHWDeviceType type,
328  AVBufferRef *src_ctx, int flags);
329 
330 
331 /**
332  * Allocate an AVHWFramesContext tied to a given device context.
333  *
334  * @param device_ctx a reference to a AVHWDeviceContext. This function will make
335  * a new reference for internal use, the one passed to the
336  * function remains owned by the caller.
337  * @return a reference to the newly created AVHWFramesContext on success or NULL
338  * on failure.
339  */
341 
342 /**
343  * Finalize the context before use. This function must be called after the
344  * context is filled with all the required information and before it is attached
345  * to any frames.
346  *
347  * @param ref a reference to the AVHWFramesContext
348  * @return 0 on success, a negative AVERROR code on failure
349  */
351 
352 /**
353  * Allocate a new frame attached to the given AVHWFramesContext.
354  *
355  * @param hwframe_ctx a reference to an AVHWFramesContext
356  * @param frame an empty (freshly allocated or unreffed) frame to be filled with
357  * newly allocated buffers.
358  * @param flags currently unused, should be set to zero
359  * @return 0 on success, a negative AVERROR code on failure
360  */
361 int av_hwframe_get_buffer(AVBufferRef *hwframe_ctx, AVFrame *frame, int flags);
362 
363 /**
364  * Copy data to or from a hw surface. At least one of dst/src must have an
365  * AVHWFramesContext attached.
366  *
367  * If src has an AVHWFramesContext attached, then the format of dst (if set)
368  * must use one of the formats returned by av_hwframe_transfer_get_formats(src,
369  * AV_HWFRAME_TRANSFER_DIRECTION_FROM).
370  * If dst has an AVHWFramesContext attached, then the format of src must use one
371  * of the formats returned by av_hwframe_transfer_get_formats(dst,
372  * AV_HWFRAME_TRANSFER_DIRECTION_TO)
373  *
374  * dst may be "clean" (i.e. with data/buf pointers unset), in which case the
375  * data buffers will be allocated by this function using av_frame_get_buffer().
376  * If dst->format is set, then this format will be used, otherwise (when
377  * dst->format is AV_PIX_FMT_NONE) the first acceptable format will be chosen.
378  *
379  * The two frames must have matching allocated dimensions (i.e. equal to
380  * AVHWFramesContext.width/height), since not all device types support
381  * transferring a sub-rectangle of the whole surface. The display dimensions
382  * (i.e. AVFrame.width/height) may be smaller than the allocated dimensions, but
383  * also have to be equal for both frames. When the display dimensions are
384  * smaller than the allocated dimensions, the content of the padding in the
385  * destination frame is unspecified.
386  *
387  * @param dst the destination frame. dst is not touched on failure.
388  * @param src the source frame.
389  * @param flags currently unused, should be set to zero
390  * @return 0 on success, a negative AVERROR error code on failure.
391  */
392 int av_hwframe_transfer_data(AVFrame *dst, const AVFrame *src, int flags);
393 
395  /**
396  * Transfer the data from the queried hw frame.
397  */
399 
400  /**
401  * Transfer the data to the queried hw frame.
402  */
404 };
405 
406 /**
407  * Get a list of possible source or target formats usable in
408  * av_hwframe_transfer_data().
409  *
410  * @param hwframe_ctx the frame context to obtain the information for
411  * @param dir the direction of the transfer
412  * @param formats the pointer to the output format list will be written here.
413  * The list is terminated with AV_PIX_FMT_NONE and must be freed
414  * by the caller when no longer needed using av_free().
415  * If this function returns successfully, the format list will
416  * have at least one item (not counting the terminator).
417  * On failure, the contents of this pointer are unspecified.
418  * @param flags currently unused, should be set to zero
419  * @return 0 on success, a negative AVERROR code on failure.
420  */
423  enum AVPixelFormat **formats, int flags);
424 
425 
426 /**
427  * This struct describes the constraints on hardware frames attached to
428  * a given device with a hardware-specific configuration. This is returned
429  * by av_hwdevice_get_hwframe_constraints() and must be freed by
430  * av_hwframe_constraints_free() after use.
431  */
432 typedef struct AVHWFramesConstraints {
433  /**
434  * A list of possible values for format in the hw_frames_ctx,
435  * terminated by AV_PIX_FMT_NONE. This member will always be filled.
436  */
438 
439  /**
440  * A list of possible values for sw_format in the hw_frames_ctx,
441  * terminated by AV_PIX_FMT_NONE. Can be NULL if this information is
442  * not known.
443  */
445 
446  /**
447  * The minimum size of frames in this hw_frames_ctx.
448  * (Zero if not known.)
449  */
452 
453  /**
454  * The maximum size of frames in this hw_frames_ctx.
455  * (INT_MAX if not known / no limit.)
456  */
460 
461 /**
462  * Allocate a HW-specific configuration structure for a given HW device.
463  * After use, the user must free all members as required by the specific
464  * hardware structure being used, then free the structure itself with
465  * av_free().
466  *
467  * @param device_ctx a reference to the associated AVHWDeviceContext.
468  * @return The newly created HW-specific configuration structure on
469  * success or NULL on failure.
470  */
471 void *av_hwdevice_hwconfig_alloc(AVBufferRef *device_ctx);
472 
473 /**
474  * Get the constraints on HW frames given a device and the HW-specific
475  * configuration to be used with that device. If no HW-specific
476  * configuration is provided, returns the maximum possible capabilities
477  * of the device.
478  *
479  * @param ref a reference to the associated AVHWDeviceContext.
480  * @param hwconfig a filled HW-specific configuration structure, or NULL
481  * to return the maximum possible capabilities of the device.
482  * @return AVHWFramesConstraints structure describing the constraints
483  * on the device, or NULL if not available.
484  */
486  const void *hwconfig);
487 
488 /**
489  * Free an AVHWFrameConstraints structure.
490  *
491  * @param constraints The (filled or unfilled) AVHWFrameConstraints structure.
492  */
494 
495 
496 /**
497  * Flags to apply to frame mappings.
498  */
499 enum {
500  /**
501  * The mapping must be readable.
502  */
504  /**
505  * The mapping must be writeable.
506  */
508  /**
509  * The mapped frame will be overwritten completely in subsequent
510  * operations, so the current frame data need not be loaded. Any values
511  * which are not overwritten are unspecified.
512  */
514  /**
515  * The mapping must be direct. That is, there must not be any copying in
516  * the map or unmap steps. Note that performance of direct mappings may
517  * be much lower than normal memory.
518  */
520 };
521 
522 /**
523  * Map a hardware frame.
524  *
525  * This has a number of different possible effects, depending on the format
526  * and origin of the src and dst frames. On input, src should be a usable
527  * frame with valid buffers and dst should be blank (typically as just created
528  * by av_frame_alloc()). src should have an associated hwframe context, and
529  * dst may optionally have a format and associated hwframe context.
530  *
531  * If src was created by mapping a frame from the hwframe context of dst,
532  * then this function undoes the mapping - dst is replaced by a reference to
533  * the frame that src was originally mapped from.
534  *
535  * If both src and dst have an associated hwframe context, then this function
536  * attempts to map the src frame from its hardware context to that of dst and
537  * then fill dst with appropriate data to be usable there. This will only be
538  * possible if the hwframe contexts and associated devices are compatible -
539  * given compatible devices, av_hwframe_ctx_create_derived() can be used to
540  * create a hwframe context for dst in which mapping should be possible.
541  *
542  * If src has a hwframe context but dst does not, then the src frame is
543  * mapped to normal memory and should thereafter be usable as a normal frame.
544  * If the format is set on dst, then the mapping will attempt to create dst
545  * with that format and fail if it is not possible. If format is unset (is
546  * AV_PIX_FMT_NONE) then dst will be mapped with whatever the most appropriate
547  * format to use is (probably the sw_format of the src hwframe context).
548  *
549  * A return value of AVERROR(ENOSYS) indicates that the mapping is not
550  * possible with the given arguments and hwframe setup, while other return
551  * values indicate that it failed somehow.
552  *
553  * @param dst Destination frame, to contain the mapping.
554  * @param src Source frame, to be mapped.
555  * @param flags Some combination of AV_HWFRAME_MAP_* flags.
556  * @return Zero on success, negative AVERROR code on failure.
557  */
558 int av_hwframe_map(AVFrame *dst, const AVFrame *src, int flags);
559 
560 
561 /**
562  * Create and initialise an AVHWFramesContext as a mapping of another existing
563  * AVHWFramesContext on a different device.
564  *
565  * av_hwframe_ctx_init() should not be called after this.
566  *
567  * @param derived_frame_ctx On success, a reference to the newly created
568  * AVHWFramesContext.
569  * @param derived_device_ctx A reference to the device to create the new
570  * AVHWFramesContext on.
571  * @param source_frame_ctx A reference to an existing AVHWFramesContext
572  * which will be mapped to the derived context.
573  * @param flags Some combination of AV_HWFRAME_MAP_* flags, defining the
574  * mapping parameters to apply to frames which are allocated
575  * in the derived device.
576  * @return Zero on success, negative AVERROR code on failure.
577  */
578 int av_hwframe_ctx_create_derived(AVBufferRef **derived_frame_ctx,
579  enum AVPixelFormat format,
580  AVBufferRef *derived_device_ctx,
581  AVBufferRef *source_frame_ctx,
582  int flags);
583 
584 #endif /* AVUTIL_HWCONTEXT_H */
This struct aggregates all the (hardware/vendor-specific) "high-level" state, i.e.
Definition: hwcontext.h:60
This structure describes decoded (raw) audio or video data.
Definition: frame.h:295
The mapped frame will be overwritten completely in subsequent operations, so the current frame data n...
Definition: hwcontext.h:513
void av_hwframe_constraints_free(AVHWFramesConstraints **constraints)
Free an AVHWFrameConstraints structure.
Definition: hwcontext.c:562
enum AVHWDeviceType av_hwdevice_iterate_types(enum AVHWDeviceType prev)
Iterate over supported device types.
Definition: hwcontext.c:97
int width
The allocated dimensions of the frames in this pool.
Definition: hwcontext.h:228
GLint GLenum type
Definition: opengl_enc.c:104
void * user_opaque
Arbitrary user data, to be used e.g.
Definition: hwcontext.h:174
#define src
Definition: vp8dsp.c:254
Filter the word “frame” indicates either a video frame or a group of audio as stored in an AVFrame structure Format for each input and each output the list of supported formats For video that means pixel format For audio that means channel sample format(the sample packing is implied by the sample format) and sample rate.The lists are not just lists
int max_width
The maximum size of frames in this hw_frames_ctx.
Definition: hwcontext.h:457
The mapping must be direct.
Definition: hwcontext.h:519
AVBufferRef * av_hwframe_ctx_alloc(AVBufferRef *device_ctx)
Allocate an AVHWFramesContext tied to a given device context.
Definition: hwcontext.c:243
The mapping must be readable.
Definition: hwcontext.h:503
enum AVHWDeviceType av_hwdevice_find_type_by_name(const char *name)
Look up an AVHWDeviceType by name.
Definition: hwcontext.c:78
int av_hwframe_transfer_data(AVFrame *dst, const AVFrame *src, int flags)
Copy data to or from a hw surface.
Definition: hwcontext.c:439
AVHWFramesConstraints * av_hwdevice_get_hwframe_constraints(AVBufferRef *ref, const void *hwconfig)
Get the constraints on HW frames given a device and the HW-specific configuration to be used with tha...
Definition: hwcontext.c:537
void * hwctx
The format-specific data, allocated and freed by libavutil along with this context.
Definition: hwcontext.h:91
#define height
int av_hwframe_transfer_get_formats(AVBufferRef *hwframe_ctx, enum AVHWFrameTransferDirection dir, enum AVPixelFormat **formats, int flags)
Get a list of possible source or target formats usable in av_hwframe_transfer_data().
Definition: hwcontext.c:381
The buffer pool.
const AVClass * av_class
A class for logging.
Definition: hwcontext.h:127
AVBufferRef * av_hwdevice_ctx_alloc(enum AVHWDeviceType type)
Allocate an AVHWDeviceContext for a given hardware type.
Definition: hwcontext.c:138
int av_hwframe_get_buffer(AVBufferRef *hwframe_ctx, AVFrame *frame, int flags)
Allocate a new frame attached to the given AVHWFramesContext.
Definition: hwcontext.c:465
enum AVHWDeviceType type
This field identifies the underlying API used for hardware access.
Definition: hwcontext.h:78
int av_hwframe_ctx_create_derived(AVBufferRef **derived_frame_ctx, enum AVPixelFormat format, AVBufferRef *derived_device_ctx, AVBufferRef *source_frame_ctx, int flags)
Create and initialise an AVHWFramesContext as a mapping of another existing AVHWFramesContext on a di...
Definition: hwcontext.c:798
The mapping must be writeable.
Definition: hwcontext.h:507
reference-counted frame API
int initial_pool_size
Initial size of the frame pool.
Definition: hwcontext.h:198
AVDictionary * opts
Definition: movenc.c:50
Transfer the data from the queried hw frame.
Definition: hwcontext.h:398
AVHWDeviceContext * device_ctx
The parent AVHWDeviceContext.
Definition: hwcontext.h:148
typedef void(APIENTRY *FF_PFNGLACTIVETEXTUREPROC)(GLenum texture)
AVFormatContext * ctx
Definition: movenc.c:48
these buffered frames must be flushed immediately if a new input produces new the filter must not call request_frame to get more It must just process the frame or queue it The task of requesting more frames is left to the filter s request_frame method or the application If a filter has several the filter must be ready for frames arriving randomly on any input any filter with several inputs will most likely require some kind of queuing mechanism It is perfectly acceptable to have a limited queue and to drop frames when the inputs are too unbalanced request_frame For filters that do not use the this method is called when a frame is wanted on an output For a it should directly call filter_frame on the corresponding output For a if there are queued frames already one of these frames should be pushed If the filter should request a frame on one of its repeatedly until at least one frame has been pushed Return or at least make progress towards producing a frame
int av_hwframe_ctx_init(AVBufferRef *ref)
Finalize the context before use.
Definition: hwcontext.c:329
int av_hwframe_map(AVFrame *dst, const AVFrame *src, int flags)
Map a hardware frame.
Definition: hwcontext.c:740
int min_width
The minimum size of frames in this hw_frames_ctx.
Definition: hwcontext.h:450
Transfer the data to the queried hw frame.
Definition: hwcontext.h:403
This struct describes the constraints on hardware frames attached to a given device with a hardware-s...
Definition: hwcontext.h:432
int av_hwdevice_ctx_init(AVBufferRef *ref)
Finalize the device context before use.
Definition: hwcontext.c:196
void * hwctx
The format-specific data, allocated and freed automatically along with this context.
Definition: hwcontext.h:161
const AVClass * av_class
A class for logging.
Definition: hwcontext.h:64
Describe the class of an AVClass context structure.
Definition: log.h:67
int av_hwdevice_ctx_create_derived(AVBufferRef **dst_ctx, enum AVHWDeviceType type, AVBufferRef *src_ctx, int flags)
Create a new device of the specified type from an existing device.
Definition: hwcontext.c:607
This struct describes a set or pool of "hardware" frames (i.e.
Definition: hwcontext.h:123
refcounted data buffer API
enum AVPixelFormat * valid_hw_formats
A list of possible values for format in the hw_frames_ctx, terminated by AV_PIX_FMT_NONE.
Definition: hwcontext.h:437
const char * av_hwdevice_get_type_name(enum AVHWDeviceType type)
Get the string name of an AVHWDeviceType.
Definition: hwcontext.c:88
#define flags(name, subs,...)
Definition: cbs_av1.c:561
void * user_opaque
Arbitrary user data, to be used e.g.
Definition: hwcontext.h:108
AVBufferRef * device_ref
A reference to the parent AVHWDeviceContext.
Definition: hwcontext.h:140
A reference to a data buffer.
Definition: buffer.h:81
static int ref[MAX_W *MAX_W]
Definition: jpeg2000dwt.c:107
AVHWFrameTransferDirection
Definition: hwcontext.h:394
pixel format definitions
AVBufferPool * pool
A pool from which the frames are allocated by av_hwframe_get_buffer().
Definition: hwcontext.h:189
AVHWDeviceType
Definition: hwcontext.h:27
int av_hwdevice_ctx_create(AVBufferRef **device_ctx, enum AVHWDeviceType type, const char *device, AVDictionary *opts, int flags)
Open a device of the specified type and create an AVHWDeviceContext for it.
Definition: hwcontext.c:571
enum AVPixelFormat * valid_sw_formats
A list of possible values for sw_format in the hw_frames_ctx, terminated by AV_PIX_FMT_NONE.
Definition: hwcontext.h:444
void(* free)(struct AVHWDeviceContext *ctx)
This field may be set by the caller before calling av_hwdevice_ctx_init().
Definition: hwcontext.h:103
formats
Definition: signature.h:48
void * av_hwdevice_hwconfig_alloc(AVBufferRef *device_ctx)
Allocate a HW-specific configuration structure for a given HW device.
Definition: hwcontext.c:526
enum AVPixelFormat sw_format
The pixel format identifying the actual data layout of the hardware frames.
Definition: hwcontext.h:221
AVPixelFormat
Pixel format.
Definition: pixfmt.h:64
const char * name
Definition: opengl_enc.c:102