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[libav.git] / libavfilter / avfilter.h
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a5cbb2f4 1/*
664f6595 2 * filter layer
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3 * copyright (c) 2007 Bobby Bingham
4 *
5 * This file is part of FFmpeg.
6 *
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
11 *
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
22#ifndef FFMPEG_AVFILTER_H
23#define FFMPEG_AVFILTER_H
24
a9c81431 25#include <stddef.h>
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26#include "avcodec.h"
27
28typedef struct AVFilterContext AVFilterContext;
29typedef struct AVFilterLink AVFilterLink;
30typedef struct AVFilterPad AVFilterPad;
31
32/* TODO: look for other flags which may be useful in this structure (interlace
33 * flags, etc)
34 */
35/**
36 * A reference-counted picture data type used by the filter system. Filters
37 * should not store pointers to this structure directly, but instead use the
664f6595 38 * AVFilterPicRef structure below.
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39 */
40typedef struct AVFilterPic
41{
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42 uint8_t *data[4]; ///< picture data for each plane
43 int linesize[4]; ///< number of bytes per line
44 enum PixelFormat format; ///< colorspace
a5cbb2f4 45
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46 unsigned refcount; ///< number of references to this image
47
48 /** private data to be used by a custom free function */
a5cbb2f4 49 void *priv;
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50 /**
51 * A pointer to the function to deallocate this image if the default
52 * function is not sufficient. This could, for example, add the memory
53 * back into a memory pool to be reused later without the overhead of
54 * reallocating it from scratch.
55 */
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56 void (*free)(struct AVFilterPic *pic);
57} AVFilterPic;
58
59/**
60 * A reference to an AVFilterPic. Since filters can manipulate the origin of
61 * a picture to, for example, crop image without any memcpy, the picture origin
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62 * and dimensions are per-reference properties. Linesize is also useful for
63 * image flipping, frame to field filters, etc, and so is also per-reference.
a5cbb2f4 64 *
1a18860a 65 * TODO: add anything necessary for frame reordering
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66 */
67typedef struct AVFilterPicRef
68{
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69 AVFilterPic *pic; ///< the picture that this is a reference to
70 uint8_t *data[4]; ///< picture data for each plane
71 int linesize[4]; ///< number of bytes per line
72 int w; ///< image width
73 int h; ///< image height
a5cbb2f4 74
056f0431 75 int64_t pts; ///< presentation timestamp in units of 1/AV_TIME_BASE
1a18860a 76
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77 AVRational pixel_aspect; ///< pixel aspect ratio
78
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79 int perms; ///< permissions
80#define AV_PERM_READ 0x01 ///< can read from the buffer
81#define AV_PERM_WRITE 0x02 ///< can write to the buffer
82#define AV_PERM_PRESERVE 0x04 ///< nobody else can overwrite the buffer
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83#define AV_PERM_REUSE 0x08 ///< can output the buffer multiple times, with the same contents each time
84#define AV_PERM_REUSE2 0x10 ///< can output the buffer multiple times, modified each time
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85} AVFilterPicRef;
86
87/**
88 * Add a new reference to a picture.
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89 * @param ref an existing reference to the picture
90 * @param pmask a bitmask containing the allowable permissions in the new
13ff8fd0 91 * reference
664f6595 92 * @return a new reference to the picture with the same properties as the
13ff8fd0 93 * old, excluding any permissions denied by pmask
a5cbb2f4 94 */
16415eaf 95AVFilterPicRef *avfilter_ref_pic(AVFilterPicRef *ref, int pmask);
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96
97/**
98 * Remove a reference to a picture. If this is the last reference to the
99 * picture, the picture itself is also automatically freed.
664f6595 100 * @param ref reference to the picture
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101 */
102void avfilter_unref_pic(AVFilterPicRef *ref);
103
13ff8fd0 104/**
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105 * A list of supported formats for one end of a filter link. This is used
106 * during the format negotiation process to try to pick the best format to
107 * use to minimize the number of necessary conversions. Each filter gives a
108 * list of the formats supported by each input and output pad. The list
109 * given for each pad need not be distinct - they may be references to the
110 * same list of formats, as is often the case when a filter supports multiple
111 * formats, but will always outut the same format as it is given in input.
112 *
113 * In this way, a list of possible input formats and a list of possible
114 * output formats are associated with each link. When a set of formats is
115 * negotiated over a link, the input and output lists are merged to form a
116 * new list containing only the common elements of each list. In the case
117 * that there were no common elements, a format conversion is necessary.
118 * Otherwise, the lists are merged, and all other links which reference
119 * either of the format lists involved in the merge are also affected.
120 *
121 * For example, consider the filter chain:
122 * filter (a) --> (b) filter (b) --> (c) filter
123 *
124 * where the letters in parenthesis indicate a list of formats supported on
125 * the input or output of the link. Suppose the lists are as follows:
126 * (a) = {A, B}
127 * (b) = {A, B, C}
128 * (c) = {B, C}
129 *
130 * First, the first link's lists are merged, yielding:
131 * filter (a) --> (a) filter (a) --> (c) filter
132 *
133 * Notice that format list (b) now refers to the same list as filter list (a).
134 * Next, the lists for the second link are merged, yielding:
135 * filter (a) --> (a) filter (a) --> (a) filter
136 *
137 * where (a) = {B}.
138 *
139 * Unfortunately, when the format lists at the two ends of a link are merged,
140 * we must ensure that all links which reference either pre-merge format list
141 * get updated as well. Therefore, we have the format list structure store a
142 * pointer to each of the pointers to itself.
143 */
144typedef struct AVFilterFormats AVFilterFormats;
145struct AVFilterFormats
146{
147 unsigned format_count; ///< number of formats
148 int *formats; ///< list of formats
149
150 unsigned refcount; ///< number of references to this list
151 AVFilterFormats ***refs; ///< references to this list
152};
153
154/**
155 * Helper function to create a list of supported formats. This is intended
156 * for use in AVFilter->query_formats().
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157 * @param len the number of formats supported
158 * @param ... a list of the supported formats
159 * @return the format list, with no existing references
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160 */
161AVFilterFormats *avfilter_make_format_list(int len, ...);
162
163/**
853961a9 164 * Returns a list of all colorspaces supported by FFmpeg.
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165 */
166AVFilterFormats *avfilter_all_colorspaces(void);
167
168/**
169 * If a and b share at least one common format, they are merged into a new
170 * format list which is returned. All the references to a and b are updated
171 * to point to this new list, and a and b are deallocated.
172 *
173 * If a and b do not share any common formats, neither is modified, and NULL
174 * is returned.
175 */
176AVFilterFormats *avfilter_merge_formats(AVFilterFormats *a, AVFilterFormats *b);
177
178/** Adds *ref as a new reference to f */
179void avfilter_formats_ref(AVFilterFormats *f, AVFilterFormats **ref);
180
181/**
182 * Remove *ref as a reference to the format list it currently points to,
664f6595 183 * deallocate that list if this was the last reference, and set *ref to NULL.
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184 */
185void avfilter_formats_unref(AVFilterFormats **ref);
186
187/**
664f6595 188 * A filter pad used for either input or output.
13ff8fd0 189 */
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190struct AVFilterPad
191{
192 /**
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193 * Pad name. The name is unique among inputs and among outputs, but an
194 * input may have the same name as an output. This may be NULL if this
195 * pad has no need to ever be referenced by name.
a5cbb2f4 196 */
2844dd39 197 const char *name;
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198
199 /**
200 * AVFilterPad type. Only video supported now, hopefully someone will
201 * add audio in the future.
202 */
daafdb6e 203 enum CodecType type;
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204
205 /**
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206 * Minimum required permissions on incoming buffers. Any buffers with
207 * insufficient permissions will be automatically copied by the filter
208 * system to a new buffer which provides the needed access permissions.
209 *
210 * Input pads only.
211 */
212 int min_perms;
213
214 /**
215 * Permissions which are not accepted on incoming buffers. Any buffer
216 * which has any of these permissions set be automatically copied by the
217 * filter system to a new buffer which does not have those permissions.
218 * This can be used to easily disallow buffers with AV_PERM_REUSE.
219 *
220 * Input pads only.
221 */
222 int rej_perms;
223
224 /**
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225 * Callback called before passing the first slice of a new frame. If
226 * NULL, the filter layer will default to storing a reference to the
227 * picture inside the link structure.
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228 *
229 * Input video pads only.
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230 */
231 void (*start_frame)(AVFilterLink *link, AVFilterPicRef *picref);
232
233 /**
234 * Callback function to get a buffer. If NULL, the filter system will
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235 * handle buffer requests.
236 *
237 * Input video pads only.
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238 */
239 AVFilterPicRef *(*get_video_buffer)(AVFilterLink *link, int perms);
240
241 /**
242 * Callback called after the slices of a frame are completely sent. If
243 * NULL, the filter layer will default to releasing the reference stored
244 * in the link structure during start_frame().
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245 *
246 * Input video pads only.
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247 */
248 void (*end_frame)(AVFilterLink *link);
249
250 /**
251 * Slice drawing callback. This is where a filter receives video data
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252 * and should do its processing.
253 *
254 * Input video pads only.
a5cbb2f4 255 */
72f6d631 256 void (*draw_slice)(AVFilterLink *link, int y, int height);
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257
258 /**
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259 * Frame poll callback. This returns the number of immediately available
260 * frames. It should return a positive value if the next request_frame()
261 * is guaranteed to return one frame (with no delay).
262 *
263 * Defaults to just calling the source poll_frame() method.
264 *
265 * Output video pads only.
266 */
267 int (*poll_frame)(AVFilterLink *link);
268
269 /**
a5cbb2f4 270 * Frame request callback. A call to this should result in at least one
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271 * frame being output over the given link. This should return zero on
272 * success, and another value on error.
273 *
274 * Output video pads only.
a5cbb2f4 275 */
63f64e6f 276 int (*request_frame)(AVFilterLink *link);
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277
278 /**
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279 * Link configuration callback.
280 *
281 * For output pads, this should set the link properties such as
282 * width/height. This should NOT set the format property - that is
283 * negotiated between filters by the filter system using the
284 * query_formats() callback before this function is called.
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285 *
286 * For input pads, this should check the properties of the link, and update
287 * the filter's internal state as necessary.
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288 *
289 * For both input and output filters, this should return zero on success,
290 * and another value on error.
a5cbb2f4 291 */
d3e57c15 292 int (*config_props)(AVFilterLink *link);
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293};
294
13ff8fd0 295/** Default handler for start_frame() for video inputs */
a5cbb2f4 296void avfilter_default_start_frame(AVFilterLink *link, AVFilterPicRef *picref);
13ff8fd0 297/** Default handler for end_frame() for video inputs */
a5cbb2f4 298void avfilter_default_end_frame(AVFilterLink *link);
13ff8fd0 299/** Default handler for config_props() for video outputs */
901e6b39 300int avfilter_default_config_output_link(AVFilterLink *link);
13ff8fd0 301/** Default handler for config_props() for video inputs */
85322466 302int avfilter_default_config_input_link (AVFilterLink *link);
13ff8fd0 303/** Default handler for get_video_buffer() for video inputs */
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304AVFilterPicRef *avfilter_default_get_video_buffer(AVFilterLink *link,
305 int perms);
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306/**
307 * A helper for query_formats() which sets all links to the same list of
308 * formats. If there are no links hooked to this filter, the list of formats is
309 * freed.
310 */
311void avfilter_set_common_formats(AVFilterContext *ctx, AVFilterFormats *formats);
312/** Default handler for query_formats() */
313int avfilter_default_query_formats(AVFilterContext *ctx);
a5cbb2f4 314
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315void avfilter_formats_changeref(AVFilterFormats **oldref,
316 AVFilterFormats **newref);
317
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318/**
319 * Filter definition. This defines the pads a filter contains, and all the
320 * callback functions used to interact with the filter.
321 */
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322typedef struct
323{
2844dd39 324 const char *name; ///< filter name
a5cbb2f4 325
13ff8fd0 326 int priv_size; ///< size of private data to allocate for the filter
a5cbb2f4 327
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328 /**
329 * Filter initialization function. Args contains the user-supplied
330 * parameters. FIXME: maybe an AVOption-based system would be better?
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331 * opaque is data provided by the code requesting creation of the filter,
332 * and is used to pass data to the filter.
4d96a914 333 */
95bcf498 334 int (*init)(AVFilterContext *ctx, const char *args, void *opaque);
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335
336 /**
337 * Filter uninitialization function. Should deallocate any memory held
338 * by the filter, release any picture references, etc. This does not need
339 * to deallocate the AVFilterContext->priv memory itself.
340 */
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341 void (*uninit)(AVFilterContext *ctx);
342
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343 /**
344 * Query formats supported by the filter and its pads. Should set the
345 * in_formats for links connected to its output pads, and out_formats
346 * for links connected to its input pads.
347 *
348 * Should return zero on success.
349 */
350 int (*query_formats)(AVFilterContext *);
351
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352 const AVFilterPad *inputs; ///< NULL terminated list of inputs. NULL if none
353 const AVFilterPad *outputs; ///< NULL terminated list of outputs. NULL if none
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354} AVFilter;
355
13ff8fd0 356/** An instance of a filter */
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357struct AVFilterContext
358{
664f6595 359 AVClass *av_class; ///< needed for av_log()
a5cbb2f4 360
664f6595 361 AVFilter *filter; ///< the AVFilter of which this is an instance
a5cbb2f4 362
13ff8fd0 363 char *name; ///< name of this filter instance
dcea2482 364
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365 unsigned input_count; ///< number of input pads
366 AVFilterPad *input_pads; ///< array of input pads
367 AVFilterLink **inputs; ///< array of pointers to input links
25f8e601 368
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369 unsigned output_count; ///< number of output pads
370 AVFilterPad *output_pads; ///< array of output pads
371 AVFilterLink **outputs; ///< array of pointers to output links
a5cbb2f4 372
13ff8fd0 373 void *priv; ///< private data for use by the filter
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374};
375
13ff8fd0 376/**
664f6595 377 * A link between two filters. This contains pointers to the source and
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378 * destination filters between which this link exists, and the indices of
379 * the pads involved. In addition, this link also contains the parameters
380 * which have been negotiated and agreed upon between the filter, such as
381 * image dimensions, format, etc
382 */
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383struct AVFilterLink
384{
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385 AVFilterContext *src; ///< source filter
386 unsigned int srcpad; ///< index of the output pad on the source filter
a5cbb2f4 387
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388 AVFilterContext *dst; ///< dest filter
389 unsigned int dstpad; ///< index of the input pad on the dest filter
a5cbb2f4 390
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391 /** stage of the initialization of the link properties (dimensions, etc) */
392 enum {
393 AVLINK_UNINIT = 0, ///< not started
394 AVLINK_STARTINIT, ///< started, but incomplete
395 AVLINK_INIT ///< complete
396 } init_state;
397
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398 int w; ///< agreed upon image width
399 int h; ///< agreed upon image height
400 enum PixelFormat format; ///< agreed upon image colorspace
a5cbb2f4 401
60bf6ce3 402 /**
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403 * Lists of formats supported by the input and output filters respectively.
404 * These lists are used for negotiating the format to actually be used,
405 * which will be loaded into the format member, above, when chosen.
406 */
407 AVFilterFormats *in_formats;
408 AVFilterFormats *out_formats;
409
410 /**
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411 * The picture reference currently being sent across the link by the source
412 * filter. This is used internally by the filter system to allow
664f6595 413 * automatic copying of pictures which do not have sufficient permissions
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414 * for the destination. This should not be accessed directly by the
415 * filters.
416 */
417 AVFilterPicRef *srcpic;
418
a5cbb2f4 419 AVFilterPicRef *cur_pic;
462f57db 420 AVFilterPicRef *outpic;
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421};
422
13ff8fd0 423/**
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424 * Link two filters together.
425 * @param src the source filter
426 * @param srcpad index of the output pad on the source filter
427 * @param dst the destination filter
428 * @param dstpad index of the input pad on the destination filter
429 * @return zero on success
13ff8fd0 430 */
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431int avfilter_link(AVFilterContext *src, unsigned srcpad,
432 AVFilterContext *dst, unsigned dstpad);
433
13ff8fd0 434/**
24c4eff6 435 * Negotiate the colorspace, dimensions, etc of all inputs to a filter.
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436 * @param filter the filter to negotiate the properties for its inputs
437 * @return zero on successful negotiation
13ff8fd0 438 */
24c4eff6 439int avfilter_config_links(AVFilterContext *filter);
85322466 440
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441/**
442 * Request a picture buffer with a specific set of permissions
664f6595 443 * @param link the output link to the filter from which the picture will
13ff8fd0 444 * be requested
664f6595 445 * @param perms the required access permissions
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446 * @return A reference to the picture. This must be unreferenced with
447 * avfilter_unref_pic when you are finished with it.
448 */
a5cbb2f4 449AVFilterPicRef *avfilter_get_video_buffer(AVFilterLink *link, int perms);
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450
451/**
452 * Request an input frame from the filter at the other end of the link.
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453 * @param link the input link
454 * @return zero on success
13ff8fd0 455 */
0155b1a1 456int avfilter_request_frame(AVFilterLink *link);
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457
458/**
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459 * Poll a frame from the filter chain.
460 * @param link the input link
461 * @return the number of imediately available frames
462 */
463int avfilter_poll_frame(AVFilterLink *link);
464
465/**
b42a6a92 466 * Notify the next filter of the start of a frame.
664f6595 467 * @param link the output link the frame will be sent over
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468 * @param picref A reference to the frame about to be sent. The data for this
469 * frame need only be valid once draw_slice() is called for that
470 * portion. The receiving filter will free this reference when
471 * it no longer needs it.
472 */
a5cbb2f4 473void avfilter_start_frame(AVFilterLink *link, AVFilterPicRef *picref);
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474
475/**
476 * Notify the next filter that the current frame has finished
664f6595 477 * @param link the output link the frame was sent over
13ff8fd0 478 */
a5cbb2f4 479void avfilter_end_frame(AVFilterLink *link);
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480
481/**
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482 * Send a slice to the next filter.
483 * @param link the output link over which the frame is being sent
484 * @param y offset in pixels from the top of the image for this slice
485 * @param h height of this slice in pixels
13ff8fd0 486 */
72f6d631 487void avfilter_draw_slice(AVFilterLink *link, int y, int h);
a5cbb2f4 488
13ff8fd0 489/** Initialize the filter system. Registers all builtin filters */
a5cbb2f4 490void avfilter_init(void);
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491
492/** Uninitialize the filter system. Unregisters all filters */
a5cbb2f4 493void avfilter_uninit(void);
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494
495/**
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496 * Register a filter. This is only needed if you plan to use
497 * avfilter_get_by_name later to lookup the AVFilter structure by name. A
498 * filter can still by instantiated with avfilter_open even if it is not
499 * registered.
664f6595 500 * @param filter the filter to register
13ff8fd0 501 */
a5cbb2f4 502void avfilter_register(AVFilter *filter);
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503
504/**
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505 * Gets a filter definition matching the given name.
506 * @param name the filter name to find
507 * @return the filter definition, if any matching one is registered.
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508 * NULL if none found.
509 */
2844dd39 510AVFilter *avfilter_get_by_name(const char *name);
a5cbb2f4 511
13ff8fd0 512/**
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513 * Create a filter instance.
514 * @param filter the filter to create an instance of
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515 * @param inst_name Name to give to the new instance. Can be NULL for none.
516 * @return Pointer to the new instance on success. NULL on failure.
517 */
2844dd39 518AVFilterContext *avfilter_open(AVFilter *filter, const char *inst_name);
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519
520/**
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521 * Initialize a filter.
522 * @param filter the filter to initialize
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523 * @param args A string of parameters to use when initializing the filter.
524 * The format and meaning of this string varies by filter.
525 * @param opaque Any extra non-string data needed by the filter. The meaning
526 * of this parameter varies by filter.
664f6595 527 * @return zero on success
13ff8fd0 528 */
6e365c57 529int avfilter_init_filter(AVFilterContext *filter, const char *args, void *opaque);
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530
531/**
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532 * Destroy a filter.
533 * @param filter the filter to destroy
13ff8fd0 534 */
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535void avfilter_destroy(AVFilterContext *filter);
536
13ff8fd0 537/**
35f3fdf4 538 * Insert a filter in the middle of an existing link.
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539 * @param link the link into which the filter should be inserted
540 * @param filt the filter to be inserted
541 * @param in the input pad on the filter to connect
542 * @param out the output pad on the filter to connect
543 * @return zero on success
13ff8fd0 544 */
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545int avfilter_insert_filter(AVFilterLink *link, AVFilterContext *filt,
546 unsigned in, unsigned out);
d3e57c15 547
a9c81431 548/**
664f6595 549 * Insert a new pad.
a9c81431
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550 * @param idx Insertion point. Pad is inserted at the end if this point
551 * is beyond the end of the list of pads.
552 * @param count Pointer to the number of pads in the list
553 * @param padidx_off Offset within an AVFilterLink structure to the element
554 * to increment when inserting a new pad causes link
555 * numbering to change
556 * @param pads Pointer to the pointer to the beginning of the list of pads
557 * @param links Pointer to the pointer to the beginning of the list of links
558 * @param newpad The new pad to add. A copy is made when adding.
559 */
560void avfilter_insert_pad(unsigned idx, unsigned *count, size_t padidx_off,
561 AVFilterPad **pads, AVFilterLink ***links,
562 AVFilterPad *newpad);
563
564/** insert a new input pad for the filter */
565static inline void avfilter_insert_inpad(AVFilterContext *f, unsigned index,
566 AVFilterPad *p)
567{
568 avfilter_insert_pad(index, &f->input_count, offsetof(AVFilterLink, dstpad),
569 &f->input_pads, &f->inputs, p);
570}
571
572/** insert a new output pad for the filter */
573static inline void avfilter_insert_outpad(AVFilterContext *f, unsigned index,
574 AVFilterPad *p)
575{
576 avfilter_insert_pad(index, &f->output_count, offsetof(AVFilterLink, srcpad),
577 &f->output_pads, &f->outputs, p);
578}
579
a5cbb2f4 580#endif /* FFMPEG_AVFILTER_H */