2 * This file is part of FFmpeg.
4 * FFmpeg is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Lesser General Public
6 * License as published by the Free Software Foundation; either
7 * version 2.1 of the License, or (at your option) any later version.
9 * FFmpeg is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Lesser General Public License for more details.
14 * You should have received a copy of the GNU Lesser General Public
15 * License along with FFmpeg; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19 #ifndef AVFILTER_INTERNAL_H
20 #define AVFILTER_INTERNAL_H
24 * internal API functions
27 #include "libavutil/internal.h"
29 #include "avfiltergraph.h"
31 #include "framepool.h"
35 #include "libavcodec/avcodec.h"
37 typedef struct AVFilterCommand {
38 double time; ///< time expressed in seconds
39 char *command; ///< command
40 char *arg; ///< optional argument for the command
42 struct AVFilterCommand *next;
46 * Update the position of a link in the age heap.
48 void ff_avfilter_graph_update_heap(AVFilterGraph *graph, AVFilterLink *link);
51 * A filter pad used for either input or output.
55 * Pad name. The name is unique among inputs and among outputs, but an
56 * input may have the same name as an output. This may be NULL if this
57 * pad has no need to ever be referenced by name.
64 enum AVMediaType type;
67 * Callback function to get a video buffer. If NULL, the filter system will
68 * use ff_default_get_video_buffer().
70 * Input video pads only.
72 AVFrame *(*get_video_buffer)(AVFilterLink *link, int w, int h);
75 * Callback function to get an audio buffer. If NULL, the filter system will
76 * use ff_default_get_audio_buffer().
78 * Input audio pads only.
80 AVFrame *(*get_audio_buffer)(AVFilterLink *link, int nb_samples);
83 * Filtering callback. This is where a filter receives a frame with
84 * audio/video data and should do its processing.
88 * @return >= 0 on success, a negative AVERROR on error. This function
89 * must ensure that samplesref is properly unreferenced on error if it
90 * hasn't been passed on to another filter.
92 int (*filter_frame)(AVFilterLink *link, AVFrame *frame);
95 * Frame poll callback. This returns the number of immediately available
96 * samples. It should return a positive value if the next request_frame()
97 * is guaranteed to return one frame (with no delay).
99 * Defaults to just calling the source poll_frame() method.
103 int (*poll_frame)(AVFilterLink *link);
106 * Frame request callback. A call to this should result in some progress
107 * towards producing output over the given link. This should return zero
108 * on success, and another value on error.
112 int (*request_frame)(AVFilterLink *link);
115 * Link configuration callback.
117 * For output pads, this should set the link properties such as
118 * width/height. This should NOT set the format property - that is
119 * negotiated between filters by the filter system using the
120 * query_formats() callback before this function is called.
122 * For input pads, this should check the properties of the link, and update
123 * the filter's internal state as necessary.
125 * For both input and output filters, this should return zero on success,
126 * and another value on error.
128 int (*config_props)(AVFilterLink *link);
131 * The filter expects a fifo to be inserted on its input link,
132 * typically because it has a delay.
139 * The filter expects writable frames from its input link,
140 * duplicating data buffers if needed.
147 struct AVFilterGraphInternal {
149 avfilter_execute_func *thread_execute;
152 struct AVFilterInternal {
153 avfilter_execute_func *execute;
157 * Tell if an integer is contained in the provided -1-terminated list of integers.
158 * This is useful for determining (for instance) if an AVPixelFormat is in an
159 * array of supported formats.
161 * @param fmt provided format
162 * @param fmts -1-terminated list of formats
163 * @return 1 if present, 0 if absent
165 int ff_fmt_is_in(int fmt, const int *fmts);
167 /* Functions to parse audio format arguments */
170 * Parse a pixel format.
172 * @param ret pixel format pointer to where the value should be written
173 * @param arg string to parse
174 * @param log_ctx log context
175 * @return >= 0 in case of success, a negative AVERROR code on error
177 av_warn_unused_result
178 int ff_parse_pixel_format(enum AVPixelFormat *ret, const char *arg, void *log_ctx);
181 * Parse a sample rate.
183 * @param ret unsigned integer pointer to where the value should be written
184 * @param arg string to parse
185 * @param log_ctx log context
186 * @return >= 0 in case of success, a negative AVERROR code on error
188 av_warn_unused_result
189 int ff_parse_sample_rate(int *ret, const char *arg, void *log_ctx);
194 * @param ret unsigned AVRational pointer to where the value should be written
195 * @param arg string to parse
196 * @param log_ctx log context
197 * @return >= 0 in case of success, a negative AVERROR code on error
199 av_warn_unused_result
200 int ff_parse_time_base(AVRational *ret, const char *arg, void *log_ctx);
203 * Parse a sample format name or a corresponding integer representation.
205 * @param ret integer pointer to where the value should be written
206 * @param arg string to parse
207 * @param log_ctx log context
208 * @return >= 0 in case of success, a negative AVERROR code on error
210 av_warn_unused_result
211 int ff_parse_sample_format(int *ret, const char *arg, void *log_ctx);
214 * Parse a channel layout or a corresponding integer representation.
216 * @param ret 64bit integer pointer to where the value should be written.
217 * @param nret integer pointer to the number of channels;
218 * if not NULL, then unknown channel layouts are accepted
219 * @param arg string to parse
220 * @param log_ctx log context
221 * @return >= 0 in case of success, a negative AVERROR code on error
223 av_warn_unused_result
224 int ff_parse_channel_layout(int64_t *ret, int *nret, const char *arg,
227 void ff_update_link_current_pts(AVFilterLink *link, int64_t pts);
229 void ff_command_queue_pop(AVFilterContext *filter);
231 /* misc trace functions */
233 /* #define FF_AVFILTER_TRACE */
235 #ifdef FF_AVFILTER_TRACE
236 # define ff_tlog(pctx, ...) av_log(pctx, AV_LOG_DEBUG, __VA_ARGS__)
238 # define ff_tlog(pctx, ...) do { if (0) av_log(pctx, AV_LOG_DEBUG, __VA_ARGS__); } while (0)
241 #define FF_TPRINTF_START(ctx, func) ff_tlog(NULL, "%-16s: ", #func)
243 char *ff_get_ref_perms_string(char *buf, size_t buf_size, int perms);
245 void ff_tlog_ref(void *ctx, AVFrame *ref, int end);
247 void ff_tlog_link(void *ctx, AVFilterLink *link, int end);
252 * @param idx Insertion point. Pad is inserted at the end if this point
253 * is beyond the end of the list of pads.
254 * @param count Pointer to the number of pads in the list
255 * @param padidx_off Offset within an AVFilterLink structure to the element
256 * to increment when inserting a new pad causes link
257 * numbering to change
258 * @param pads Pointer to the pointer to the beginning of the list of pads
259 * @param links Pointer to the pointer to the beginning of the list of links
260 * @param newpad The new pad to add. A copy is made when adding.
261 * @return >= 0 in case of success, a negative AVERROR code on error
263 int ff_insert_pad(unsigned idx, unsigned *count, size_t padidx_off,
264 AVFilterPad **pads, AVFilterLink ***links,
265 AVFilterPad *newpad);
267 /** Insert a new input pad for the filter. */
268 static inline int ff_insert_inpad(AVFilterContext *f, unsigned index,
271 return ff_insert_pad(index, &f->nb_inputs, offsetof(AVFilterLink, dstpad),
272 &f->input_pads, &f->inputs, p);
275 /** Insert a new output pad for the filter. */
276 static inline int ff_insert_outpad(AVFilterContext *f, unsigned index,
279 return ff_insert_pad(index, &f->nb_outputs, offsetof(AVFilterLink, srcpad),
280 &f->output_pads, &f->outputs, p);
284 * Poll a frame from the filter chain.
286 * @param link the input link
287 * @return the number of immediately available frames, a negative
288 * number in case of error
290 int ff_poll_frame(AVFilterLink *link);
293 * Request an input frame from the filter at the other end of the link.
295 * The input filter may pass the request on to its inputs, fulfill the
296 * request from an internal buffer or any other means specific to its function.
298 * When the end of a stream is reached AVERROR_EOF is returned and no further
299 * frames are returned after that.
301 * When a filter is unable to output a frame for example due to its sources
302 * being unable to do so or because it depends on external means pushing data
303 * into it then AVERROR(EAGAIN) is returned.
304 * It is important that a AVERROR(EAGAIN) return is returned all the way to the
305 * caller (generally eventually a user application) as this step may (but does
306 * not have to be) necessary to provide the input with the next frame.
308 * If a request is successful then some progress has been made towards
309 * providing a frame on the link (through ff_filter_frame()). A filter that
310 * needs several frames to produce one is allowed to return success if one
311 * more frame has been processed but no output has been produced yet. A
312 * filter is also allowed to simply forward a success return value.
314 * @param link the input link
315 * @return zero on success
316 * AVERROR_EOF on end of file
317 * AVERROR(EAGAIN) if the previous filter cannot output a frame
318 * currently and can neither guarantee that EOF has been reached.
320 int ff_request_frame(AVFilterLink *link);
322 #define AVFILTER_DEFINE_CLASS(fname) \
323 static const AVClass fname##_class = { \
324 .class_name = #fname, \
325 .item_name = av_default_item_name, \
326 .option = fname##_options, \
327 .version = LIBAVUTIL_VERSION_INT, \
328 .category = AV_CLASS_CATEGORY_FILTER, \
332 * Find the index of a link.
334 * I.e. find i such that link == ctx->(in|out)puts[i]
336 #define FF_INLINK_IDX(link) ((int)((link)->dstpad - (link)->dst->input_pads))
337 #define FF_OUTLINK_IDX(link) ((int)((link)->srcpad - (link)->src->output_pads))
340 * Send a frame of data to the next filter.
342 * @param link the output link over which the data is being sent
343 * @param frame a reference to the buffer of data being sent. The
344 * receiving filter will free this reference when it no longer
345 * needs it or pass it on to the next filter.
347 * @return >= 0 on success, a negative AVERROR on error. The receiving filter
348 * is responsible for unreferencing frame in case of error.
350 int ff_filter_frame(AVFilterLink *link, AVFrame *frame);
353 * Allocate a new filter context and return it.
355 * @param filter what filter to create an instance of
356 * @param inst_name name to give to the new filter context
358 * @return newly created filter context or NULL on failure
360 AVFilterContext *ff_filter_alloc(const AVFilter *filter, const char *inst_name);
363 * Remove a filter from a graph;
365 void ff_filter_graph_remove_filter(AVFilterGraph *graph, AVFilterContext *filter);
368 * Normalize the qscale factor
369 * FIXME the H264 qscale is a log based scale, mpeg1/2 is not, the code below
372 static inline int ff_norm_qscale(int qscale, int type)
375 case FF_QSCALE_TYPE_MPEG1: return qscale;
376 case FF_QSCALE_TYPE_MPEG2: return qscale >> 1;
377 case FF_QSCALE_TYPE_H264: return qscale >> 2;
378 case FF_QSCALE_TYPE_VP56: return (63 - qscale + 2) >> 2;
383 #endif /* AVFILTER_INTERNAL_H */