*/
#include "avfilter.h"
-#include "avfiltergraph.h"
+#if !FF_API_AVFILTERPAD_PUBLIC
/**
- * Check for the validity of graph.
- *
- * A graph is considered valid if all its input and output pads are
- * connected.
- *
- * @return 0 in case of success, a negative value otherwise
+ * A filter pad used for either input or output.
*/
-int ff_avfilter_graph_check_validity(AVFilterGraph *graphctx, AVClass *log_ctx);
+struct AVFilterPad {
+ /**
+ * Pad name. The name is unique among inputs and among outputs, but an
+ * input may have the same name as an output. This may be NULL if this
+ * pad has no need to ever be referenced by name.
+ */
+ const char *name;
+
+ /**
+ * AVFilterPad type.
+ */
+ enum AVMediaType type;
+
+ /**
+ * Minimum required permissions on incoming buffers. Any buffer with
+ * insufficient permissions will be automatically copied by the filter
+ * system to a new buffer which provides the needed access permissions.
+ *
+ * Input pads only.
+ */
+ int min_perms;
+
+ /**
+ * Permissions which are not accepted on incoming buffers. Any buffer
+ * which has any of these permissions set will be automatically copied
+ * by the filter system to a new buffer which does not have those
+ * permissions. This can be used to easily disallow buffers with
+ * AV_PERM_REUSE.
+ *
+ * Input pads only.
+ */
+ int rej_perms;
+
+ /**
+ * Callback called before passing the first slice of a new frame. If
+ * NULL, the filter layer will default to storing a reference to the
+ * picture inside the link structure.
+ *
+ * Input video pads only.
+ *
+ * @return >= 0 on success, a negative AVERROR on error. picref will be
+ * unreferenced by the caller in case of error.
+ */
+ void (*start_frame)(AVFilterLink *link, AVFilterBufferRef *picref);
+
+ /**
+ * Callback function to get a video buffer. If NULL, the filter system will
+ * use avfilter_default_get_video_buffer().
+ *
+ * Input video pads only.
+ */
+ AVFilterBufferRef *(*get_video_buffer)(AVFilterLink *link, int perms, int w, int h);
+
+ /**
+ * Callback function to get an audio buffer. If NULL, the filter system will
+ * use avfilter_default_get_audio_buffer().
+ *
+ * Input audio pads only.
+ */
+ AVFilterBufferRef *(*get_audio_buffer)(AVFilterLink *link, int perms,
+ int nb_samples);
+
+ /**
+ * Callback called after the slices of a frame are completely sent. If
+ * NULL, the filter layer will default to releasing the reference stored
+ * in the link structure during start_frame().
+ *
+ * Input video pads only.
+ *
+ * @return >= 0 on success, a negative AVERROR on error.
+ */
+ int (*end_frame)(AVFilterLink *link);
+
+ /**
+ * Slice drawing callback. This is where a filter receives video data
+ * and should do its processing.
+ *
+ * Input video pads only.
+ *
+ * @return >= 0 on success, a negative AVERROR on error.
+ */
+ int (*draw_slice)(AVFilterLink *link, int y, int height, int slice_dir);
+
+ /**
+ * Samples filtering callback. This is where a filter receives audio data
+ * and should do its processing.
+ *
+ * Input audio pads only.
+ *
+ * @return >= 0 on success, a negative AVERROR on error. This function
+ * must ensure that samplesref is properly unreferenced on error if it
+ * hasn't been passed on to another filter.
+ */
+ int (*filter_samples)(AVFilterLink *link, AVFilterBufferRef *samplesref);
+
+ /**
+ * Frame poll callback. This returns the number of immediately available
+ * samples. It should return a positive value if the next request_frame()
+ * is guaranteed to return one frame (with no delay).
+ *
+ * Defaults to just calling the source poll_frame() method.
+ *
+ * Output pads only.
+ */
+ int (*poll_frame)(AVFilterLink *link);
+
+ /**
+ * Frame request callback. A call to this should result in at least one
+ * frame being output over the given link. This should return zero on
+ * success, and another value on error.
+ *
+ * Output pads only.
+ */
+ int (*request_frame)(AVFilterLink *link);
+
+ /**
+ * Link configuration callback.
+ *
+ * For output pads, this should set the link properties such as
+ * width/height. This should NOT set the format property - that is
+ * negotiated between filters by the filter system using the
+ * query_formats() callback before this function is called.
+ *
+ * For input pads, this should check the properties of the link, and update
+ * the filter's internal state as necessary.
+ *
+ * For both input and output filters, this should return zero on success,
+ * and another value on error.
+ */
+ int (*config_props)(AVFilterLink *link);
+
+ /**
+ * The filter expects a fifo to be inserted on its input link,
+ * typically because it has a delay.
+ *
+ * input pads only.
+ */
+ int needs_fifo;
+};
+#endif
+
+/** default handler for freeing audio/video buffer when there are no references left */
+void ff_avfilter_default_free_buffer(AVFilterBuffer *buf);
+
+/** Tell is a format is contained in the provided list terminated by -1. */
+int ff_fmt_is_in(int fmt, const int *fmts);
+
+#define FF_DPRINTF_START(ctx, func) av_dlog(NULL, "%-16s: ", #func)
+
+void ff_dlog_link(void *ctx, AVFilterLink *link, int end);
/**
- * Configure all the links of graphctx.
+ * Insert a new pad.
*
- * @return 0 in case of success, a negative value otherwise
+ * @param idx Insertion point. Pad is inserted at the end if this point
+ * is beyond the end of the list of pads.
+ * @param count Pointer to the number of pads in the list
+ * @param padidx_off Offset within an AVFilterLink structure to the element
+ * to increment when inserting a new pad causes link
+ * numbering to change
+ * @param pads Pointer to the pointer to the beginning of the list of pads
+ * @param links Pointer to the pointer to the beginning of the list of links
+ * @param newpad The new pad to add. A copy is made when adding.
*/
-int ff_avfilter_graph_config_links(AVFilterGraph *graphctx, AVClass *log_ctx);
+void ff_insert_pad(unsigned idx, unsigned *count, size_t padidx_off,
+ AVFilterPad **pads, AVFilterLink ***links,
+ AVFilterPad *newpad);
+
+/** Insert a new input pad for the filter. */
+static inline void ff_insert_inpad(AVFilterContext *f, unsigned index,
+ AVFilterPad *p)
+{
+ ff_insert_pad(index, &f->nb_inputs, offsetof(AVFilterLink, dstpad),
+ &f->input_pads, &f->inputs, p);
+#if FF_API_FOO_COUNT
+ f->input_count = f->nb_inputs;
+#endif
+}
+
+/** Insert a new output pad for the filter. */
+static inline void ff_insert_outpad(AVFilterContext *f, unsigned index,
+ AVFilterPad *p)
+{
+ ff_insert_pad(index, &f->nb_outputs, offsetof(AVFilterLink, srcpad),
+ &f->output_pads, &f->outputs, p);
+#if FF_API_FOO_COUNT
+ f->output_count = f->nb_outputs;
+#endif
+}
/**
- * Configure the formats of all the links in the graph.
+ * Poll a frame from the filter chain.
+ *
+ * @param link the input link
+ * @return the number of immediately available frames, a negative
+ * number in case of error
*/
-int ff_avfilter_graph_config_formats(AVFilterGraph *graphctx, AVClass *log_ctx);
+int ff_poll_frame(AVFilterLink *link);
-/** default handler for freeing audio/video buffer when there are no references left */
-void ff_avfilter_default_free_buffer(AVFilterBuffer *buf);
+/**
+ * Request an input frame from the filter at the other end of the link.
+ *
+ * @param link the input link
+ * @return zero on success
+ */
+int ff_request_frame(AVFilterLink *link);
#endif /* AVFILTER_INTERNAL_H */
projects / ffmpeg / blobdiff