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12 * Lesser General Public License for more details.
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19 #ifndef AVFILTER_INTERNAL_H
20 #define AVFILTER_INTERNAL_H
24 * internal API functions
27 #include "libavutil/internal.h"
32 #if !FF_API_AVFILTERPAD_PUBLIC
34 * A filter pad used for either input or output.
38 * Pad name. The name is unique among inputs and among outputs, but an
39 * input may have the same name as an output. This may be NULL if this
40 * pad has no need to ever be referenced by name.
47 enum AVMediaType type;
50 * Callback function to get a video buffer. If NULL, the filter system will
51 * use avfilter_default_get_video_buffer().
53 * Input video pads only.
55 AVFrame *(*get_video_buffer)(AVFilterLink *link, int w, int h);
58 * Callback function to get an audio buffer. If NULL, the filter system will
59 * use avfilter_default_get_audio_buffer().
61 * Input audio pads only.
63 AVFrame *(*get_audio_buffer)(AVFilterLink *link, int nb_samples);
66 * Filtering callback. This is where a filter receives a frame with
67 * audio/video data and should do its processing.
71 * @return >= 0 on success, a negative AVERROR on error. This function
72 * must ensure that samplesref is properly unreferenced on error if it
73 * hasn't been passed on to another filter.
75 int (*filter_frame)(AVFilterLink *link, AVFrame *frame);
78 * Frame poll callback. This returns the number of immediately available
79 * samples. It should return a positive value if the next request_frame()
80 * is guaranteed to return one frame (with no delay).
82 * Defaults to just calling the source poll_frame() method.
86 int (*poll_frame)(AVFilterLink *link);
89 * Frame request callback. A call to this should result in at least one
90 * frame being output over the given link. This should return zero on
91 * success, and another value on error.
95 int (*request_frame)(AVFilterLink *link);
98 * Link configuration callback.
100 * For output pads, this should set the link properties such as
101 * width/height. This should NOT set the format property - that is
102 * negotiated between filters by the filter system using the
103 * query_formats() callback before this function is called.
105 * For input pads, this should check the properties of the link, and update
106 * the filter's internal state as necessary.
108 * For both input and output filters, this should return zero on success,
109 * and another value on error.
111 int (*config_props)(AVFilterLink *link);
114 * The filter expects a fifo to be inserted on its input link,
115 * typically because it has a delay.
122 * The filter expects writable frames from its input link,
123 * duplicating data buffers if needed.
131 struct AVFilterGraphInternal {
133 avfilter_execute_func *thread_execute;
136 struct AVFilterInternal {
137 avfilter_execute_func *execute;
140 #if FF_API_AVFILTERBUFFER
141 /** default handler for freeing audio/video buffer when there are no references left */
142 void ff_avfilter_default_free_buffer(AVFilterBuffer *buf);
145 /** Tell is a format is contained in the provided list terminated by -1. */
146 int ff_fmt_is_in(int fmt, const int *fmts);
148 #define FF_DPRINTF_START(ctx, func) av_dlog(NULL, "%-16s: ", #func)
150 void ff_dlog_link(void *ctx, AVFilterLink *link, int end);
155 * @param idx Insertion point. Pad is inserted at the end if this point
156 * is beyond the end of the list of pads.
157 * @param count Pointer to the number of pads in the list
158 * @param padidx_off Offset within an AVFilterLink structure to the element
159 * to increment when inserting a new pad causes link
160 * numbering to change
161 * @param pads Pointer to the pointer to the beginning of the list of pads
162 * @param links Pointer to the pointer to the beginning of the list of links
163 * @param newpad The new pad to add. A copy is made when adding.
165 void ff_insert_pad(unsigned idx, unsigned *count, size_t padidx_off,
166 AVFilterPad **pads, AVFilterLink ***links,
167 AVFilterPad *newpad);
169 /** Insert a new input pad for the filter. */
170 static inline void ff_insert_inpad(AVFilterContext *f, unsigned index,
173 ff_insert_pad(index, &f->nb_inputs, offsetof(AVFilterLink, dstpad),
174 &f->input_pads, &f->inputs, p);
176 FF_DISABLE_DEPRECATION_WARNINGS
177 f->input_count = f->nb_inputs;
178 FF_ENABLE_DEPRECATION_WARNINGS
182 /** Insert a new output pad for the filter. */
183 static inline void ff_insert_outpad(AVFilterContext *f, unsigned index,
186 ff_insert_pad(index, &f->nb_outputs, offsetof(AVFilterLink, srcpad),
187 &f->output_pads, &f->outputs, p);
189 FF_DISABLE_DEPRECATION_WARNINGS
190 f->output_count = f->nb_outputs;
191 FF_ENABLE_DEPRECATION_WARNINGS
196 * Poll a frame from the filter chain.
198 * @param link the input link
199 * @return the number of immediately available frames, a negative
200 * number in case of error
202 int ff_poll_frame(AVFilterLink *link);
205 * Request an input frame from the filter at the other end of the link.
207 * @param link the input link
208 * @return zero on success
210 int ff_request_frame(AVFilterLink *link);
213 * Send a frame of data to the next filter.
215 * @param link the output link over which the data is being sent
216 * @param frame a reference to the buffer of data being sent. The
217 * receiving filter will free this reference when it no longer
218 * needs it or pass it on to the next filter.
220 * @return >= 0 on success, a negative AVERROR on error. The receiving filter
221 * is responsible for unreferencing frame in case of error.
223 int ff_filter_frame(AVFilterLink *link, AVFrame *frame);
226 * Allocate a new filter context and return it.
228 * @param filter what filter to create an instance of
229 * @param inst_name name to give to the new filter context
231 * @return newly created filter context or NULL on failure
233 AVFilterContext *ff_filter_alloc(const AVFilter *filter, const char *inst_name);
236 * Remove a filter from a graph;
238 void ff_filter_graph_remove_filter(AVFilterGraph *graph, AVFilterContext *filter);
240 #endif /* AVFILTER_INTERNAL_H */