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
28 #include "avfiltergraph.h"
33 typedef struct AVFilterPool {
34 AVFilterBufferRef *pic[POOL_SIZE];
40 typedef struct AVFilterCommand {
41 double time; ///< time expressed in seconds
42 char *command; ///< command
43 char *arg; ///< optional argument for the command
45 struct AVFilterCommand *next;
49 * Update the position of a link in the age heap.
51 void ff_avfilter_graph_update_heap(AVFilterGraph *graph, AVFilterLink *link);
53 #if !FF_API_AVFILTERPAD_PUBLIC
55 * A filter pad used for either input or output.
59 * Pad name. The name is unique among inputs and among outputs, but an
60 * input may have the same name as an output. This may be NULL if this
61 * pad has no need to ever be referenced by name.
68 enum AVMediaType type;
71 * Minimum required permissions on incoming buffers. Any buffer with
72 * insufficient permissions will be automatically copied by the filter
73 * system to a new buffer which provides the needed access permissions.
80 * Permissions which are not accepted on incoming buffers. Any buffer
81 * which has any of these permissions set will be automatically copied
82 * by the filter system to a new buffer which does not have those
83 * permissions. This can be used to easily disallow buffers with
91 * Callback called before passing the first slice of a new frame. If
92 * NULL, the filter layer will default to storing a reference to the
93 * picture inside the link structure.
95 * Input video pads only.
97 void (*start_frame)(AVFilterLink *link, AVFilterBufferRef *picref);
100 * Callback function to get a video buffer. If NULL, the filter system will
101 * use avfilter_default_get_video_buffer().
103 * Input video pads only.
105 AVFilterBufferRef *(*get_video_buffer)(AVFilterLink *link, int perms, int w, int h);
108 * Callback function to get an audio buffer. If NULL, the filter system will
109 * use avfilter_default_get_audio_buffer().
111 * Input audio pads only.
113 AVFilterBufferRef *(*get_audio_buffer)(AVFilterLink *link, int perms,
117 * Callback called after the slices of a frame are completely sent. If
118 * NULL, the filter layer will default to releasing the reference stored
119 * in the link structure during start_frame().
121 * Input video pads only.
123 void (*end_frame)(AVFilterLink *link);
126 * Slice drawing callback. This is where a filter receives video data
127 * and should do its processing.
129 * Input video pads only.
131 void (*draw_slice)(AVFilterLink *link, int y, int height, int slice_dir);
134 * Samples filtering callback. This is where a filter receives audio data
135 * and should do its processing.
137 * Input audio pads only.
139 * @return >= 0 on success, a negative AVERROR on error. This function
140 * must ensure that samplesref is properly unreferenced on error if it
141 * hasn't been passed on to another filter.
143 int (*filter_samples)(AVFilterLink *link, AVFilterBufferRef *samplesref);
146 * Frame poll callback. This returns the number of immediately available
147 * samples. It should return a positive value if the next request_frame()
148 * is guaranteed to return one frame (with no delay).
150 * Defaults to just calling the source poll_frame() method.
154 int (*poll_frame)(AVFilterLink *link);
157 * Frame request callback. A call to this should result in at least one
158 * frame being output over the given link. This should return zero on
159 * success, and another value on error.
163 int (*request_frame)(AVFilterLink *link);
166 * Link configuration callback.
168 * For output pads, this should set the link properties such as
169 * width/height. This should NOT set the format property - that is
170 * negotiated between filters by the filter system using the
171 * query_formats() callback before this function is called.
173 * For input pads, this should check the properties of the link, and update
174 * the filter's internal state as necessary.
176 * For both input and output filters, this should return zero on success,
177 * and another value on error.
179 int (*config_props)(AVFilterLink *link);
182 * The filter expects a fifo to be inserted on its input link,
183 * typically because it has a delay.
191 /** default handler for freeing audio/video buffer when there are no references left */
192 void ff_avfilter_default_free_buffer(AVFilterBuffer *buf);
194 /** Tell is a format is contained in the provided list terminated by -1. */
195 int ff_fmt_is_in(int fmt, const int *fmts);
198 * Return a copy of a list of integers terminated by -1, or NULL in
199 * case of copy failure.
201 int *ff_copy_int_list(const int * const list);
204 * Return a copy of a list of 64-bit integers, or NULL in case of
207 int64_t *ff_copy_int64_list(const int64_t * const list);
209 /* Functions to parse audio format arguments */
212 * Parse a pixel format.
214 * @param ret pixel format pointer to where the value should be written
215 * @param arg string to parse
216 * @param log_ctx log context
217 * @return 0 in case of success, a negative AVERROR code on error
219 int ff_parse_pixel_format(enum PixelFormat *ret, const char *arg, void *log_ctx);
222 * Parse a sample rate.
224 * @param ret unsigned integer pointer to where the value should be written
225 * @param arg string to parse
226 * @param log_ctx log context
227 * @return 0 in case of success, a negative AVERROR code on error
229 int ff_parse_sample_rate(int *ret, const char *arg, void *log_ctx);
234 * @param ret unsigned AVRational pointer to where the value should be written
235 * @param arg string to parse
236 * @param log_ctx log context
237 * @return 0 in case of success, a negative AVERROR code on error
239 int ff_parse_time_base(AVRational *ret, const char *arg, void *log_ctx);
242 * Parse a sample format name or a corresponding integer representation.
244 * @param ret integer pointer to where the value should be written
245 * @param arg string to parse
246 * @param log_ctx log context
247 * @return 0 in case of success, a negative AVERROR code on error
249 int ff_parse_sample_format(int *ret, const char *arg, void *log_ctx);
252 * Parse a channel layout or a corresponding integer representation.
254 * @param ret 64bit integer pointer to where the value should be written.
255 * @param arg string to parse
256 * @param log_ctx log context
257 * @return 0 in case of success, a negative AVERROR code on error
259 int ff_parse_channel_layout(int64_t *ret, const char *arg, void *log_ctx);
261 void ff_update_link_current_pts(AVFilterLink *link, int64_t pts);
263 void ff_free_pool(AVFilterPool *pool);
265 void ff_command_queue_pop(AVFilterContext *filter);
267 /* misc trace functions */
269 /* #define FF_AVFILTER_TRACE */
271 #ifdef FF_AVFILTER_TRACE
272 # define ff_tlog(pctx, ...) av_log(pctx, AV_LOG_DEBUG, __VA_ARGS__)
274 # define ff_tlog(pctx, ...) do { if (0) av_log(pctx, AV_LOG_DEBUG, __VA_ARGS__); } while (0)
277 #define FF_TPRINTF_START(ctx, func) ff_tlog(NULL, "%-16s: ", #func)
279 char *ff_get_ref_perms_string(char *buf, size_t buf_size, int perms);
281 void ff_tlog_ref(void *ctx, AVFilterBufferRef *ref, int end);
283 void ff_tlog_link(void *ctx, AVFilterLink *link, int end);
288 * @param idx Insertion point. Pad is inserted at the end if this point
289 * is beyond the end of the list of pads.
290 * @param count Pointer to the number of pads in the list
291 * @param padidx_off Offset within an AVFilterLink structure to the element
292 * to increment when inserting a new pad causes link
293 * numbering to change
294 * @param pads Pointer to the pointer to the beginning of the list of pads
295 * @param links Pointer to the pointer to the beginning of the list of links
296 * @param newpad The new pad to add. A copy is made when adding.
298 void ff_insert_pad(unsigned idx, unsigned *count, size_t padidx_off,
299 AVFilterPad **pads, AVFilterLink ***links,
300 AVFilterPad *newpad);
302 /** Insert a new input pad for the filter. */
303 static inline void ff_insert_inpad(AVFilterContext *f, unsigned index,
306 ff_insert_pad(index, &f->nb_inputs, offsetof(AVFilterLink, dstpad),
307 &f->input_pads, &f->inputs, p);
309 f->input_count = f->nb_inputs;
313 /** Insert a new output pad for the filter. */
314 static inline void ff_insert_outpad(AVFilterContext *f, unsigned index,
317 ff_insert_pad(index, &f->nb_outputs, offsetof(AVFilterLink, srcpad),
318 &f->output_pads, &f->outputs, p);
320 f->output_count = f->nb_outputs;
325 * Poll a frame from the filter chain.
327 * @param link the input link
328 * @return the number of immediately available frames, a negative
329 * number in case of error
331 int ff_poll_frame(AVFilterLink *link);
334 * Request an input frame from the filter at the other end of the link.
336 * @param link the input link
337 * @return zero on success
339 int ff_request_frame(AVFilterLink *link);
341 #define AVFILTER_DEFINE_CLASS(fname) \
342 static const AVClass fname##_class = { \
343 .class_name = #fname, \
344 .item_name = av_default_item_name, \
345 .option = fname##_options, \
346 .version = LIBAVUTIL_VERSION_INT, \
347 .category = AV_CLASS_CATEGORY_FILTER, \
350 #endif /* AVFILTER_INTERNAL_H */