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"
32 #include "framequeue.h"
36 #include "libavcodec/avcodec.h"
38 typedef struct AVFilterCommand {
39 double time; ///< time expressed in seconds
40 char *command; ///< command
41 char *arg; ///< optional argument for the command
43 struct AVFilterCommand *next;
47 * Update the position of a link in the age heap.
49 void ff_avfilter_graph_update_heap(AVFilterGraph *graph, AVFilterLink *link);
52 * A filter pad used for either input or output.
56 * Pad name. The name is unique among inputs and among outputs, but an
57 * input may have the same name as an output. This may be NULL if this
58 * pad has no need to ever be referenced by name.
65 enum AVMediaType type;
68 * Callback function to get a video buffer. If NULL, the filter system will
69 * use ff_default_get_video_buffer().
71 * Input video pads only.
73 AVFrame *(*get_video_buffer)(AVFilterLink *link, int w, int h);
76 * Callback function to get an audio buffer. If NULL, the filter system will
77 * use ff_default_get_audio_buffer().
79 * Input audio pads only.
81 AVFrame *(*get_audio_buffer)(AVFilterLink *link, int nb_samples);
84 * Filtering callback. This is where a filter receives a frame with
85 * audio/video data and should do its processing.
89 * @return >= 0 on success, a negative AVERROR on error. This function
90 * must ensure that frame is properly unreferenced on error if it
91 * hasn't been passed on to another filter.
93 int (*filter_frame)(AVFilterLink *link, AVFrame *frame);
96 * Frame poll callback. This returns the number of immediately available
97 * samples. It should return a positive value if the next request_frame()
98 * is guaranteed to return one frame (with no delay).
100 * Defaults to just calling the source poll_frame() method.
104 int (*poll_frame)(AVFilterLink *link);
107 * Frame request callback. A call to this should result in some progress
108 * towards producing output over the given link. This should return zero
109 * on success, and another value on error.
113 int (*request_frame)(AVFilterLink *link);
116 * Link configuration callback.
118 * For output pads, this should set the link properties such as
119 * width/height. This should NOT set the format property - that is
120 * negotiated between filters by the filter system using the
121 * query_formats() callback before this function is called.
123 * For input pads, this should check the properties of the link, and update
124 * the filter's internal state as necessary.
126 * For both input and output filters, this should return zero on success,
127 * and another value on error.
129 int (*config_props)(AVFilterLink *link);
132 * The filter expects a fifo to be inserted on its input link,
133 * typically because it has a delay.
140 * The filter expects writable frames from its input link,
141 * duplicating data buffers if needed.
148 struct AVFilterGraphInternal {
150 avfilter_execute_func *thread_execute;
151 FFFrameQueueGlobal frame_queues;
154 struct AVFilterInternal {
155 avfilter_execute_func *execute;
159 * Tell if an integer is contained in the provided -1-terminated list of integers.
160 * This is useful for determining (for instance) if an AVPixelFormat is in an
161 * array of supported formats.
163 * @param fmt provided format
164 * @param fmts -1-terminated list of formats
165 * @return 1 if present, 0 if absent
167 int ff_fmt_is_in(int fmt, const int *fmts);
169 /* Functions to parse audio format arguments */
172 * Parse a pixel format.
174 * @param ret pixel format pointer to where the value should be written
175 * @param arg string to parse
176 * @param log_ctx log context
177 * @return >= 0 in case of success, a negative AVERROR code on error
179 av_warn_unused_result
180 int ff_parse_pixel_format(enum AVPixelFormat *ret, const char *arg, void *log_ctx);
183 * Parse a sample rate.
185 * @param ret unsigned integer pointer to where the value should be written
186 * @param arg string to parse
187 * @param log_ctx log context
188 * @return >= 0 in case of success, a negative AVERROR code on error
190 av_warn_unused_result
191 int ff_parse_sample_rate(int *ret, const char *arg, void *log_ctx);
196 * @param ret unsigned AVRational pointer to where the value should be written
197 * @param arg string to parse
198 * @param log_ctx log context
199 * @return >= 0 in case of success, a negative AVERROR code on error
201 av_warn_unused_result
202 int ff_parse_time_base(AVRational *ret, const char *arg, void *log_ctx);
205 * Parse a sample format name or a corresponding integer representation.
207 * @param ret integer pointer to where the value should be written
208 * @param arg string to parse
209 * @param log_ctx log context
210 * @return >= 0 in case of success, a negative AVERROR code on error
212 av_warn_unused_result
213 int ff_parse_sample_format(int *ret, const char *arg, void *log_ctx);
216 * Parse a channel layout or a corresponding integer representation.
218 * @param ret 64bit integer pointer to where the value should be written.
219 * @param nret integer pointer to the number of channels;
220 * if not NULL, then unknown channel layouts are accepted
221 * @param arg string to parse
222 * @param log_ctx log context
223 * @return >= 0 in case of success, a negative AVERROR code on error
225 av_warn_unused_result
226 int ff_parse_channel_layout(int64_t *ret, int *nret, const char *arg,
229 void ff_update_link_current_pts(AVFilterLink *link, int64_t pts);
232 * Set the status field of a link from the source filter.
233 * The pts should reflect the timestamp of the status change,
234 * in link time base and relative to the frames timeline.
235 * In particular, for AVERROR_EOF, it should reflect the
236 * end time of the last frame.
238 void ff_avfilter_link_set_in_status(AVFilterLink *link, int status, int64_t pts);
241 * Set the status field of a link from the destination filter.
242 * The pts should probably be left unset (AV_NOPTS_VALUE).
244 void ff_avfilter_link_set_out_status(AVFilterLink *link, int status, int64_t pts);
246 void ff_command_queue_pop(AVFilterContext *filter);
248 /* misc trace functions */
250 /* #define FF_AVFILTER_TRACE */
252 #ifdef FF_AVFILTER_TRACE
253 # define ff_tlog(pctx, ...) av_log(pctx, AV_LOG_DEBUG, __VA_ARGS__)
255 # define ff_tlog(pctx, ...) do { if (0) av_log(pctx, AV_LOG_DEBUG, __VA_ARGS__); } while (0)
258 #define FF_TPRINTF_START(ctx, func) ff_tlog(NULL, "%-16s: ", #func)
260 char *ff_get_ref_perms_string(char *buf, size_t buf_size, int perms);
262 void ff_tlog_ref(void *ctx, AVFrame *ref, int end);
264 void ff_tlog_link(void *ctx, AVFilterLink *link, int end);
269 * @param idx Insertion point. Pad is inserted at the end if this point
270 * is beyond the end of the list of pads.
271 * @param count Pointer to the number of pads in the list
272 * @param padidx_off Offset within an AVFilterLink structure to the element
273 * to increment when inserting a new pad causes link
274 * numbering to change
275 * @param pads Pointer to the pointer to the beginning of the list of pads
276 * @param links Pointer to the pointer to the beginning of the list of links
277 * @param newpad The new pad to add. A copy is made when adding.
278 * @return >= 0 in case of success, a negative AVERROR code on error
280 int ff_insert_pad(unsigned idx, unsigned *count, size_t padidx_off,
281 AVFilterPad **pads, AVFilterLink ***links,
282 AVFilterPad *newpad);
284 /** Insert a new input pad for the filter. */
285 static inline int ff_insert_inpad(AVFilterContext *f, unsigned index,
288 return ff_insert_pad(index, &f->nb_inputs, offsetof(AVFilterLink, dstpad),
289 &f->input_pads, &f->inputs, p);
292 /** Insert a new output pad for the filter. */
293 static inline int ff_insert_outpad(AVFilterContext *f, unsigned index,
296 return ff_insert_pad(index, &f->nb_outputs, offsetof(AVFilterLink, srcpad),
297 &f->output_pads, &f->outputs, p);
301 * Poll a frame from the filter chain.
303 * @param link the input link
304 * @return the number of immediately available frames, a negative
305 * number in case of error
307 int ff_poll_frame(AVFilterLink *link);
310 * Request an input frame from the filter at the other end of the link.
312 * This function must not be used by filters using the activate callback,
313 * use ff_link_set_frame_wanted() instead.
315 * The input filter may pass the request on to its inputs, fulfill the
316 * request from an internal buffer or any other means specific to its function.
318 * When the end of a stream is reached AVERROR_EOF is returned and no further
319 * frames are returned after that.
321 * When a filter is unable to output a frame for example due to its sources
322 * being unable to do so or because it depends on external means pushing data
323 * into it then AVERROR(EAGAIN) is returned.
324 * It is important that a AVERROR(EAGAIN) return is returned all the way to the
325 * caller (generally eventually a user application) as this step may (but does
326 * not have to be) necessary to provide the input with the next frame.
328 * If a request is successful then some progress has been made towards
329 * providing a frame on the link (through ff_filter_frame()). A filter that
330 * needs several frames to produce one is allowed to return success if one
331 * more frame has been processed but no output has been produced yet. A
332 * filter is also allowed to simply forward a success return value.
334 * @param link the input link
335 * @return zero on success
336 * AVERROR_EOF on end of file
337 * AVERROR(EAGAIN) if the previous filter cannot output a frame
338 * currently and can neither guarantee that EOF has been reached.
340 int ff_request_frame(AVFilterLink *link);
342 #define AVFILTER_DEFINE_CLASS(fname) \
343 static const AVClass fname##_class = { \
344 .class_name = #fname, \
345 .item_name = av_default_item_name, \
346 .option = fname##_options, \
347 .version = LIBAVUTIL_VERSION_INT, \
348 .category = AV_CLASS_CATEGORY_FILTER, \
352 * Find the index of a link.
354 * I.e. find i such that link == ctx->(in|out)puts[i]
356 #define FF_INLINK_IDX(link) ((int)((link)->dstpad - (link)->dst->input_pads))
357 #define FF_OUTLINK_IDX(link) ((int)((link)->srcpad - (link)->src->output_pads))
360 * Send a frame of data to the next filter.
362 * @param link the output link over which the data is being sent
363 * @param frame a reference to the buffer of data being sent. The
364 * receiving filter will free this reference when it no longer
365 * needs it or pass it on to the next filter.
367 * @return >= 0 on success, a negative AVERROR on error. The receiving filter
368 * is responsible for unreferencing frame in case of error.
370 int ff_filter_frame(AVFilterLink *link, AVFrame *frame);
373 * Allocate a new filter context and return it.
375 * @param filter what filter to create an instance of
376 * @param inst_name name to give to the new filter context
378 * @return newly created filter context or NULL on failure
380 AVFilterContext *ff_filter_alloc(const AVFilter *filter, const char *inst_name);
382 int ff_filter_activate(AVFilterContext *filter);
385 * Remove a filter from a graph;
387 void ff_filter_graph_remove_filter(AVFilterGraph *graph, AVFilterContext *filter);
390 * The filter is aware of hardware frames, and any hardware frame context
391 * should not be automatically propagated through it.
393 #define FF_FILTER_FLAG_HWFRAME_AWARE (1 << 0)
396 * Run one round of processing on a filter graph.
398 int ff_filter_graph_run_once(AVFilterGraph *graph);
401 * Normalize the qscale factor
402 * FIXME the H264 qscale is a log based scale, mpeg1/2 is not, the code below
405 static inline int ff_norm_qscale(int qscale, int type)
408 case FF_QSCALE_TYPE_MPEG1: return qscale;
409 case FF_QSCALE_TYPE_MPEG2: return qscale >> 1;
410 case FF_QSCALE_TYPE_H264: return qscale >> 2;
411 case FF_QSCALE_TYPE_VP56: return (63 - qscale + 2) >> 2;
417 * Get number of threads for current filter instance.
418 * This number is always same or less than graph->nb_threads.
420 int ff_filter_get_nb_threads(AVFilterContext *ctx);
422 #endif /* AVFILTER_INTERNAL_H */