36 #define BUFFER_ALIGN 32 74 &pool_width, &pool_height,
75 &pool_format, &pool_align) < 0) {
79 if (pool_width != w || pool_height != h ||
This structure describes decoded (raw) audio or video data.
AVFrame * ff_frame_pool_get(FFFramePool *pool)
Allocate a new AVFrame, reussing old buffers from the pool when available.
Main libavfilter public API header.
Memory handling functions.
AVFrame * ff_null_get_video_buffer(AVFilterLink *link, int w, int h)
AVFrame * ff_get_video_buffer(AVFilterLink *link, int w, int h)
Request a picture buffer with a specific set of permissions.
AVFilterPad * dstpad
input pad on the dest filter
void ff_frame_pool_uninit(FFFramePool **pool)
Deallocate the frame pool.
AVFrame * av_frame_alloc(void)
Allocate an AVFrame and set its fields to default values.
static AVFrame * get_video_buffer(AVFilterLink *inlink, int w, int h)
A link between two filters.
void av_frame_free(AVFrame **frame)
Free the frame and any dynamically allocated objects in it, e.g.
simple assert() macros that are a bit more flexible than ISO C assert().
#define FF_TPRINTF_START(ctx, func)
FFFramePool * ff_frame_pool_video_init(AVBufferRef *(*alloc)(int size), int width, int height, enum AVPixelFormat format, int align)
Allocate and initialize a video frame pool.
int av_hwframe_get_buffer(AVBufferRef *hwframe_ref, AVFrame *frame, int flags)
Allocate a new frame attached to the given AVHWFramesContext.
AVFrame *(* get_video_buffer)(AVFilterLink *link, int w, int h)
Callback function to get a video buffer.
AVBufferRef * hw_frames_ctx
For hwaccel pixel formats, this should be a reference to the AVHWFramesContext describing the frames...
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 format
agreed upon media format
void ff_tlog_link(void *ctx, AVFilterLink *link, int end)
uint8_t * data
The data buffer.
AVRational sample_aspect_ratio
Sample aspect ratio for the video frame, 0/1 if unknown/unspecified.
AVBufferRef * av_buffer_allocz(int size)
Same as av_buffer_alloc(), except the returned buffer will be initialized to zero.
This struct describes a set or pool of "hardware" frames (i.e.
refcounted data buffer API
AVRational sample_aspect_ratio
agreed upon sample aspect ratio
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 they are references to shared objects When the negotiation mechanism computes the intersection of the formats supported at each end of a link
AVFilterLink ** outputs
array of pointers to output links
void * frame_pool
A pointer to a FFFramePool struct.
int ff_frame_pool_get_video_config(FFFramePool *pool, int *width, int *height, enum AVPixelFormat *format, int *align)
Get the video frame pool configuration.
AVFrame * ff_default_get_video_buffer(AVFilterLink *link, int w, int h)
AVFilterContext * dst
dest filter
AVPixelFormat
Pixel format.