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internal.h
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1 /*
2  * This file is part of FFmpeg.
3  *
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.
8  *
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.
13  *
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
17  */
18 
19 #ifndef AVFILTER_INTERNAL_H
20 #define AVFILTER_INTERNAL_H
21 
22 /**
23  * @file
24  * internal API functions
25  */
26 
27 #include "libavutil/internal.h"
28 #include "avfilter.h"
29 #include "avfiltergraph.h"
30 #include "formats.h"
31 #include "thread.h"
32 #include "version.h"
33 #include "video.h"
34 
35 #define POOL_SIZE 32
36 typedef struct AVFilterPool {
37  AVFilterBufferRef *pic[POOL_SIZE];
38  int count;
39  int refcount;
40  int draining;
41 } AVFilterPool;
42 
43 typedef struct AVFilterCommand {
44  double time; ///< time expressed in seconds
45  char *command; ///< command
46  char *arg; ///< optional argument for the command
47  int flags;
50 
51 /**
52  * Update the position of a link in the age heap.
53  */
55 
56 #if !FF_API_AVFILTERPAD_PUBLIC
57 /**
58  * A filter pad used for either input or output.
59  */
60 struct AVFilterPad {
61  /**
62  * Pad name. The name is unique among inputs and among outputs, but an
63  * input may have the same name as an output. This may be NULL if this
64  * pad has no need to ever be referenced by name.
65  */
66  const char *name;
67 
68  /**
69  * AVFilterPad type.
70  */
72 
73  /**
74  * Callback function to get a video buffer. If NULL, the filter system will
75  * use ff_default_get_video_buffer().
76  *
77  * Input video pads only.
78  */
79  AVFrame *(*get_video_buffer)(AVFilterLink *link, int w, int h);
80 
81  /**
82  * Callback function to get an audio buffer. If NULL, the filter system will
83  * use ff_default_get_audio_buffer().
84  *
85  * Input audio pads only.
86  */
87  AVFrame *(*get_audio_buffer)(AVFilterLink *link, int nb_samples);
88 
89  /**
90  * Filtering callback. This is where a filter receives a frame with
91  * audio/video data and should do its processing.
92  *
93  * Input pads only.
94  *
95  * @return >= 0 on success, a negative AVERROR on error. This function
96  * must ensure that samplesref is properly unreferenced on error if it
97  * hasn't been passed on to another filter.
98  */
100 
101  /**
102  * Frame poll callback. This returns the number of immediately available
103  * samples. It should return a positive value if the next request_frame()
104  * is guaranteed to return one frame (with no delay).
105  *
106  * Defaults to just calling the source poll_frame() method.
107  *
108  * Output pads only.
109  */
110  int (*poll_frame)(AVFilterLink *link);
111 
112  /**
113  * Frame request callback. A call to this should result in at least one
114  * frame being output over the given link. This should return zero on
115  * success, and another value on error.
116  *
117  * Output pads only.
118  */
120 
121  /**
122  * Link configuration callback.
123  *
124  * For output pads, this should set the link properties such as
125  * width/height. This should NOT set the format property - that is
126  * negotiated between filters by the filter system using the
127  * query_formats() callback before this function is called.
128  *
129  * For input pads, this should check the properties of the link, and update
130  * the filter's internal state as necessary.
131  *
132  * For both input and output filters, this should return zero on success,
133  * and another value on error.
134  */
135  int (*config_props)(AVFilterLink *link);
136 
137  /**
138  * The filter expects a fifo to be inserted on its input link,
139  * typically because it has a delay.
140  *
141  * input pads only.
142  */
144 
145  /**
146  * The filter expects writable frames from its input link,
147  * duplicating data buffers if needed.
148  *
149  * input pads only.
150  */
152 };
153 #endif
154 
156  void *thread;
158 };
159 
162 };
163 
164 #if FF_API_AVFILTERBUFFER
165 /** default handler for freeing audio/video buffer when there are no references left */
166 void ff_avfilter_default_free_buffer(AVFilterBuffer *buf);
167 #endif
168 
169 /** Tell is a format is contained in the provided list terminated by -1. */
170 int ff_fmt_is_in(int fmt, const int *fmts);
171 
172 /* Functions to parse audio format arguments */
173 
174 /**
175  * Parse a pixel format.
176  *
177  * @param ret pixel format pointer to where the value should be written
178  * @param arg string to parse
179  * @param log_ctx log context
180  * @return >= 0 in case of success, a negative AVERROR code on error
181  */
182 int ff_parse_pixel_format(enum AVPixelFormat *ret, const char *arg, void *log_ctx);
183 
184 /**
185  * Parse a sample rate.
186  *
187  * @param ret unsigned integer pointer to where the value should be written
188  * @param arg string to parse
189  * @param log_ctx log context
190  * @return >= 0 in case of success, a negative AVERROR code on error
191  */
192 int ff_parse_sample_rate(int *ret, const char *arg, void *log_ctx);
193 
194 /**
195  * Parse a time base.
196  *
197  * @param ret unsigned AVRational pointer to where the value should be written
198  * @param arg string to parse
199  * @param log_ctx log context
200  * @return >= 0 in case of success, a negative AVERROR code on error
201  */
202 int ff_parse_time_base(AVRational *ret, const char *arg, void *log_ctx);
203 
204 /**
205  * Parse a sample format name or a corresponding integer representation.
206  *
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
211  */
212 int ff_parse_sample_format(int *ret, const char *arg, void *log_ctx);
213 
214 /**
215  * Parse a channel layout or a corresponding integer representation.
216  *
217  * @param ret 64bit integer pointer to where the value should be written.
218  * @param nret integer pointer to the number of channels;
219  * if not NULL, then unknown channel layouts are accepted
220  * @param arg string to parse
221  * @param log_ctx log context
222  * @return >= 0 in case of success, a negative AVERROR code on error
223  */
224 int ff_parse_channel_layout(int64_t *ret, int *nret, const char *arg,
225  void *log_ctx);
226 
227 void ff_update_link_current_pts(AVFilterLink *link, int64_t pts);
228 
230 
231 /* misc trace functions */
232 
233 /* #define FF_AVFILTER_TRACE */
234 
235 #ifdef FF_AVFILTER_TRACE
236 # define ff_tlog(pctx, ...) av_log(pctx, AV_LOG_DEBUG, __VA_ARGS__)
237 #else
238 # define ff_tlog(pctx, ...) do { if (0) av_log(pctx, AV_LOG_DEBUG, __VA_ARGS__); } while (0)
239 #endif
240 
241 #define FF_TPRINTF_START(ctx, func) ff_tlog(NULL, "%-16s: ", #func)
242 
243 char *ff_get_ref_perms_string(char *buf, size_t buf_size, int perms);
244 
245 void ff_tlog_ref(void *ctx, AVFrame *ref, int end);
246 
247 void ff_tlog_link(void *ctx, AVFilterLink *link, int end);
248 
249 /**
250  * Insert a new pad.
251  *
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
262  */
263 int ff_insert_pad(unsigned idx, unsigned *count, size_t padidx_off,
264  AVFilterPad **pads, AVFilterLink ***links,
265  AVFilterPad *newpad);
266 
267 /** Insert a new input pad for the filter. */
268 static inline int ff_insert_inpad(AVFilterContext *f, unsigned index,
269  AVFilterPad *p)
270 {
271  int ret = ff_insert_pad(index, &f->nb_inputs, offsetof(AVFilterLink, dstpad),
272  &f->input_pads, &f->inputs, p);
273 #if FF_API_FOO_COUNT
275  f->input_count = f->nb_inputs;
277 #endif
278  return ret;
279 }
280 
281 /** Insert a new output pad for the filter. */
282 static inline int ff_insert_outpad(AVFilterContext *f, unsigned index,
283  AVFilterPad *p)
284 {
285  int ret = ff_insert_pad(index, &f->nb_outputs, offsetof(AVFilterLink, srcpad),
286  &f->output_pads, &f->outputs, p);
287 #if FF_API_FOO_COUNT
289  f->output_count = f->nb_outputs;
291 #endif
292  return ret;
293 }
294 
295 /**
296  * Poll a frame from the filter chain.
297  *
298  * @param link the input link
299  * @return the number of immediately available frames, a negative
300  * number in case of error
301  */
302 int ff_poll_frame(AVFilterLink *link);
303 
304 /**
305  * Request an input frame from the filter at the other end of the link.
306  *
307  * @param link the input link
308  * @return zero on success
309  */
310 int ff_request_frame(AVFilterLink *link);
311 
312 #define AVFILTER_DEFINE_CLASS(fname) \
313  static const AVClass fname##_class = { \
314  .class_name = #fname, \
315  .item_name = av_default_item_name, \
316  .option = fname##_options, \
317  .version = LIBAVUTIL_VERSION_INT, \
318  .category = AV_CLASS_CATEGORY_FILTER, \
319  }
320 
321 AVFilterBufferRef *ff_copy_buffer_ref(AVFilterLink *outlink,
322  AVFilterBufferRef *ref);
323 
324 /**
325  * Find the index of a link.
326  *
327  * I.e. find i such that link == ctx->(in|out)puts[i]
328  */
329 #define FF_INLINK_IDX(link) ((int)((link)->dstpad - (link)->dst->input_pads))
330 #define FF_OUTLINK_IDX(link) ((int)((link)->srcpad - (link)->src->output_pads))
331 
332 int ff_buffersink_read_compat(AVFilterContext *ctx, AVFilterBufferRef **buf);
333 int ff_buffersink_read_samples_compat(AVFilterContext *ctx, AVFilterBufferRef **pbuf,
334  int nb_samples);
335 /**
336  * Send a frame of data to the next filter.
337  *
338  * @param link the output link over which the data is being sent
339  * @param frame a reference to the buffer of data being sent. The
340  * receiving filter will free this reference when it no longer
341  * needs it or pass it on to the next filter.
342  *
343  * @return >= 0 on success, a negative AVERROR on error. The receiving filter
344  * is responsible for unreferencing frame in case of error.
345  */
347 
348 /**
349  * Flags for AVFilterLink.flags.
350  */
351 enum {
352 
353  /**
354  * Frame requests may need to loop in order to be fulfilled.
355  * A filter must set this flags on an output link if it may return 0 in
356  * request_frame() without filtering a frame.
357  */
359 
360 };
361 
362 /**
363  * Allocate a new filter context and return it.
364  *
365  * @param filter what filter to create an instance of
366  * @param inst_name name to give to the new filter context
367  *
368  * @return newly created filter context or NULL on failure
369  */
370 AVFilterContext *ff_filter_alloc(const AVFilter *filter, const char *inst_name);
371 
372 /**
373  * Remove a filter from a graph;
374  */
376 
377 #endif /* AVFILTER_INTERNAL_H */