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19 #ifndef AVFILTER_INTERNAL_H
20 #define AVFILTER_INTERNAL_H
24 * internal API functions
27 #include "libavutil/internal.h"
33 * A filter pad used for either input or output.
37 * Pad name. The name is unique among inputs and among outputs, but an
38 * input may have the same name as an output. This may be NULL if this
39 * pad has no need to ever be referenced by name.
46 enum AVMediaType type;
49 * Callback function to get a video buffer. If NULL, the filter system will
50 * use avfilter_default_get_video_buffer().
52 * Input video pads only.
54 AVFrame *(*get_video_buffer)(AVFilterLink *link, int w, int h);
57 * Callback function to get an audio buffer. If NULL, the filter system will
58 * use avfilter_default_get_audio_buffer().
60 * Input audio pads only.
62 AVFrame *(*get_audio_buffer)(AVFilterLink *link, int nb_samples);
65 * Filtering callback. This is where a filter receives a frame with
66 * audio/video data and should do its processing.
70 * @return >= 0 on success, a negative AVERROR on error. This function
71 * must ensure that samplesref is properly unreferenced on error if it
72 * hasn't been passed on to another filter.
74 int (*filter_frame)(AVFilterLink *link, AVFrame *frame);
77 * Frame poll callback. This returns the number of immediately available
78 * samples. It should return a positive value if the next request_frame()
79 * is guaranteed to return one frame (with no delay).
81 * Defaults to just calling the source poll_frame() method.
85 int (*poll_frame)(AVFilterLink *link);
88 * Frame request callback. A call to this should result in at least one
89 * frame being output over the given link. This should return zero on
90 * success, and another value on error.
94 int (*request_frame)(AVFilterLink *link);
97 * Link configuration callback.
99 * For output pads, this should set the link properties such as
100 * width/height. This should NOT set the format property - that is
101 * negotiated between filters by the filter system using the
102 * query_formats() callback before this function is called.
104 * For input pads, this should check the properties of the link, and update
105 * the filter's internal state as necessary.
107 * For both input and output filters, this should return zero on success,
108 * and another value on error.
110 int (*config_props)(AVFilterLink *link);
113 * The filter expects a fifo to be inserted on its input link,
114 * typically because it has a delay.
121 * The filter expects writable frames from its input link,
122 * duplicating data buffers if needed.
129 struct AVFilterGraphInternal {
131 avfilter_execute_func *thread_execute;
134 struct AVFilterInternal {
135 avfilter_execute_func *execute;
138 /** Tell is a format is contained in the provided list terminated by -1. */
139 int ff_fmt_is_in(int fmt, const int *fmts);
141 #define FF_DPRINTF_START(ctx, func) av_log(NULL, AV_LOG_TRACE, "%-16s: ", #func)
143 void ff_dlog_link(void *ctx, AVFilterLink *link, int end);
148 * @param idx Insertion point. Pad is inserted at the end if this point
149 * is beyond the end of the list of pads.
150 * @param count Pointer to the number of pads in the list
151 * @param padidx_off Offset within an AVFilterLink structure to the element
152 * to increment when inserting a new pad causes link
153 * numbering to change
154 * @param pads Pointer to the pointer to the beginning of the list of pads
155 * @param links Pointer to the pointer to the beginning of the list of links
156 * @param newpad The new pad to add. A copy is made when adding.
158 void ff_insert_pad(unsigned idx, unsigned *count, size_t padidx_off,
159 AVFilterPad **pads, AVFilterLink ***links,
160 AVFilterPad *newpad);
162 /** Insert a new input pad for the filter. */
163 static inline void ff_insert_inpad(AVFilterContext *f, unsigned index,
166 ff_insert_pad(index, &f->nb_inputs, offsetof(AVFilterLink, dstpad),
167 &f->input_pads, &f->inputs, p);
170 /** Insert a new output pad for the filter. */
171 static inline void ff_insert_outpad(AVFilterContext *f, unsigned index,
174 ff_insert_pad(index, &f->nb_outputs, offsetof(AVFilterLink, srcpad),
175 &f->output_pads, &f->outputs, p);
179 * Poll a frame from the filter chain.
181 * @param link the input link
182 * @return the number of immediately available frames, a negative
183 * number in case of error
185 int ff_poll_frame(AVFilterLink *link);
188 * Request an input frame from the filter at the other end of the link.
190 * @param link the input link
191 * @return zero on success
193 int ff_request_frame(AVFilterLink *link);
196 * Send a frame of data to the next filter.
198 * @param link the output link over which the data is being sent
199 * @param frame a reference to the buffer of data being sent. The
200 * receiving filter will free this reference when it no longer
201 * needs it or pass it on to the next filter.
203 * @return >= 0 on success, a negative AVERROR on error. The receiving filter
204 * is responsible for unreferencing frame in case of error.
206 int ff_filter_frame(AVFilterLink *link, AVFrame *frame);
209 * Allocate a new filter context and return it.
211 * @param filter what filter to create an instance of
212 * @param inst_name name to give to the new filter context
214 * @return newly created filter context or NULL on failure
216 AVFilterContext *ff_filter_alloc(const AVFilter *filter, const char *inst_name);
219 * Remove a filter from a graph;
221 void ff_filter_graph_remove_filter(AVFilterGraph *graph, AVFilterContext *filter);
223 #endif /* AVFILTER_INTERNAL_H */