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"
34 #include "libavcodec/avcodec.h"
36 typedef struct AVFilterCommand {
37 double time; ///< time expressed in seconds
38 char *command; ///< command
39 char *arg; ///< optional argument for the command
41 struct AVFilterCommand *next;
45 * Update the position of a link in the age heap.
47 void ff_avfilter_graph_update_heap(AVFilterGraph *graph, AVFilterLink *link);
50 * A filter pad used for either input or output.
54 * Pad name. The name is unique among inputs and among outputs, but an
55 * input may have the same name as an output. This may be NULL if this
56 * pad has no need to ever be referenced by name.
63 enum AVMediaType type;
66 * Callback function to get a video buffer. If NULL, the filter system will
67 * use ff_default_get_video_buffer().
69 * Input video pads only.
71 AVFrame *(*get_video_buffer)(AVFilterLink *link, int w, int h);
74 * Callback function to get an audio buffer. If NULL, the filter system will
75 * use ff_default_get_audio_buffer().
77 * Input audio pads only.
79 AVFrame *(*get_audio_buffer)(AVFilterLink *link, int nb_samples);
82 * Filtering callback. This is where a filter receives a frame with
83 * audio/video data and should do its processing.
87 * @return >= 0 on success, a negative AVERROR on error. This function
88 * must ensure that samplesref is properly unreferenced on error if it
89 * hasn't been passed on to another filter.
91 int (*filter_frame)(AVFilterLink *link, AVFrame *frame);
94 * Frame poll callback. This returns the number of immediately available
95 * samples. It should return a positive value if the next request_frame()
96 * is guaranteed to return one frame (with no delay).
98 * Defaults to just calling the source poll_frame() method.
102 int (*poll_frame)(AVFilterLink *link);
105 * Frame request callback. A call to this should result in at least one
106 * frame being output over the given link. This should return zero on
107 * success, and another value on error.
111 int (*request_frame)(AVFilterLink *link);
114 * Link configuration callback.
116 * For output pads, this should set the link properties such as
117 * width/height. This should NOT set the format property - that is
118 * negotiated between filters by the filter system using the
119 * query_formats() callback before this function is called.
121 * For input pads, this should check the properties of the link, and update
122 * the filter's internal state as necessary.
124 * For both input and output filters, this should return zero on success,
125 * and another value on error.
127 int (*config_props)(AVFilterLink *link);
130 * The filter expects a fifo to be inserted on its input link,
131 * typically because it has a delay.
138 * The filter expects writable frames from its input link,
139 * duplicating data buffers if needed.
146 struct AVFilterGraphInternal {
148 avfilter_execute_func *thread_execute;
151 struct AVFilterInternal {
152 avfilter_execute_func *execute;
155 /** Tell is a format is contained in the provided list terminated by -1. */
156 int ff_fmt_is_in(int fmt, const int *fmts);
158 /* Functions to parse audio format arguments */
161 * Parse a pixel format.
163 * @param ret pixel format pointer to where the value should be written
164 * @param arg string to parse
165 * @param log_ctx log context
166 * @return >= 0 in case of success, a negative AVERROR code on error
168 int ff_parse_pixel_format(enum AVPixelFormat *ret, const char *arg, void *log_ctx);
171 * Parse a sample rate.
173 * @param ret unsigned integer pointer to where the value should be written
174 * @param arg string to parse
175 * @param log_ctx log context
176 * @return >= 0 in case of success, a negative AVERROR code on error
178 int ff_parse_sample_rate(int *ret, const char *arg, void *log_ctx);
183 * @param ret unsigned AVRational 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 int ff_parse_time_base(AVRational *ret, const char *arg, void *log_ctx);
191 * Parse a sample format name or a corresponding integer representation.
193 * @param ret integer pointer to where the value should be written
194 * @param arg string to parse
195 * @param log_ctx log context
196 * @return >= 0 in case of success, a negative AVERROR code on error
198 int ff_parse_sample_format(int *ret, const char *arg, void *log_ctx);
201 * Parse a channel layout or a corresponding integer representation.
203 * @param ret 64bit integer pointer to where the value should be written.
204 * @param nret integer pointer to the number of channels;
205 * if not NULL, then unknown channel layouts are accepted
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 int ff_parse_channel_layout(int64_t *ret, int *nret, const char *arg,
213 void ff_update_link_current_pts(AVFilterLink *link, int64_t pts);
215 void ff_command_queue_pop(AVFilterContext *filter);
217 /* misc trace functions */
219 /* #define FF_AVFILTER_TRACE */
221 #ifdef FF_AVFILTER_TRACE
222 # define ff_tlog(pctx, ...) av_log(pctx, AV_LOG_DEBUG, __VA_ARGS__)
224 # define ff_tlog(pctx, ...) do { if (0) av_log(pctx, AV_LOG_DEBUG, __VA_ARGS__); } while (0)
227 #define FF_TPRINTF_START(ctx, func) ff_tlog(NULL, "%-16s: ", #func)
229 char *ff_get_ref_perms_string(char *buf, size_t buf_size, int perms);
231 void ff_tlog_ref(void *ctx, AVFrame *ref, int end);
233 void ff_tlog_link(void *ctx, AVFilterLink *link, int end);
238 * @param idx Insertion point. Pad is inserted at the end if this point
239 * is beyond the end of the list of pads.
240 * @param count Pointer to the number of pads in the list
241 * @param padidx_off Offset within an AVFilterLink structure to the element
242 * to increment when inserting a new pad causes link
243 * numbering to change
244 * @param pads Pointer to the pointer to the beginning of the list of pads
245 * @param links Pointer to the pointer to the beginning of the list of links
246 * @param newpad The new pad to add. A copy is made when adding.
247 * @return >= 0 in case of success, a negative AVERROR code on error
249 int ff_insert_pad(unsigned idx, unsigned *count, size_t padidx_off,
250 AVFilterPad **pads, AVFilterLink ***links,
251 AVFilterPad *newpad);
253 /** Insert a new input pad for the filter. */
254 static inline int ff_insert_inpad(AVFilterContext *f, unsigned index,
257 return ff_insert_pad(index, &f->nb_inputs, offsetof(AVFilterLink, dstpad),
258 &f->input_pads, &f->inputs, p);
261 /** Insert a new output pad for the filter. */
262 static inline int ff_insert_outpad(AVFilterContext *f, unsigned index,
265 return ff_insert_pad(index, &f->nb_outputs, offsetof(AVFilterLink, srcpad),
266 &f->output_pads, &f->outputs, p);
270 * Poll a frame from the filter chain.
272 * @param link the input link
273 * @return the number of immediately available frames, a negative
274 * number in case of error
276 int ff_poll_frame(AVFilterLink *link);
279 * Request an input frame from the filter at the other end of the link.
281 * The input filter may pass the request on to its inputs, fulfill the
282 * request from an internal buffer or any other means specific to its function.
284 * When the end of a stream is reached AVERROR_EOF is returned and no further
285 * frames are returned after that.
287 * When a filter is unable to output a frame for example due to its sources
288 * being unable to do so or because it depends on external means pushing data
289 * into it then AVERROR(EAGAIN) is returned.
290 * It is important that a AVERROR(EAGAIN) return is returned all the way to the
291 * caller (generally eventually a user application) as this step may (but does
292 * not have to be) necessary to provide the input with the next frame.
294 * If a request is successful then the filter_frame() function will be called
295 * at least once before ff_request_frame() returns
297 * @param link the input link
298 * @return zero on success
299 * AVERROR_EOF on end of file
300 * AVERROR(EAGAIN) if the previous filter cannot output a frame
301 * currently and can neither guarantee that EOF has been reached.
303 int ff_request_frame(AVFilterLink *link);
305 #define AVFILTER_DEFINE_CLASS(fname) \
306 static const AVClass fname##_class = { \
307 .class_name = #fname, \
308 .item_name = av_default_item_name, \
309 .option = fname##_options, \
310 .version = LIBAVUTIL_VERSION_INT, \
311 .category = AV_CLASS_CATEGORY_FILTER, \
315 * Find the index of a link.
317 * I.e. find i such that link == ctx->(in|out)puts[i]
319 #define FF_INLINK_IDX(link) ((int)((link)->dstpad - (link)->dst->input_pads))
320 #define FF_OUTLINK_IDX(link) ((int)((link)->srcpad - (link)->src->output_pads))
323 * Send a frame of data to the next filter.
325 * @param link the output link over which the data is being sent
326 * @param frame a reference to the buffer of data being sent. The
327 * receiving filter will free this reference when it no longer
328 * needs it or pass it on to the next filter.
330 * @return >= 0 on success, a negative AVERROR on error. The receiving filter
331 * is responsible for unreferencing frame in case of error.
333 int ff_filter_frame(AVFilterLink *link, AVFrame *frame);
336 * Flags for AVFilterLink.flags.
341 * Frame requests may need to loop in order to be fulfilled.
342 * A filter must set this flags on an output link if it may return 0 in
343 * request_frame() without filtering a frame.
345 FF_LINK_FLAG_REQUEST_LOOP = 1,
350 * Allocate a new filter context and return it.
352 * @param filter what filter to create an instance of
353 * @param inst_name name to give to the new filter context
355 * @return newly created filter context or NULL on failure
357 AVFilterContext *ff_filter_alloc(const AVFilter *filter, const char *inst_name);
360 * Remove a filter from a graph;
362 void ff_filter_graph_remove_filter(AVFilterGraph *graph, AVFilterContext *filter);
365 * Normalize the qscale factor
366 * FIXME the H264 qscale is a log based scale, mpeg1/2 is not, the code below
369 static inline int ff_norm_qscale(int qscale, int type)
372 case FF_QSCALE_TYPE_MPEG1: return qscale;
373 case FF_QSCALE_TYPE_MPEG2: return qscale >> 1;
374 case FF_QSCALE_TYPE_H264: return qscale >> 2;
375 case FF_QSCALE_TYPE_VP56: return (63 - qscale + 2) >> 2;
380 #endif /* AVFILTER_INTERNAL_H */