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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
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25#define LIBAVFILTER_VERSION 0.0.0
26
a9c81431 27#include <stddef.h>
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28#include "avcodec.h"
29
30typedef struct AVFilterContext AVFilterContext;
31typedef struct AVFilterLink AVFilterLink;
32typedef struct AVFilterPad AVFilterPad;
33
34/* TODO: look for other flags which may be useful in this structure (interlace
35 * flags, etc)
36 */
37/**
38 * A reference-counted picture data type used by the filter system. Filters
39 * should not store pointers to this structure directly, but instead use the
664f6595 40 * AVFilterPicRef structure below.
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41 */
42typedef struct AVFilterPic
43{
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44 uint8_t *data[4]; ///< picture data for each plane
45 int linesize[4]; ///< number of bytes per line
46 enum PixelFormat format; ///< colorspace
a5cbb2f4 47
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48 unsigned refcount; ///< number of references to this image
49
50 /** private data to be used by a custom free function */
a5cbb2f4 51 void *priv;
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52 /**
53 * A pointer to the function to deallocate this image if the default
54 * function is not sufficient. This could, for example, add the memory
55 * back into a memory pool to be reused later without the overhead of
56 * reallocating it from scratch.
57 */
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58 void (*free)(struct AVFilterPic *pic);
59} AVFilterPic;
60
61/**
62 * A reference to an AVFilterPic. Since filters can manipulate the origin of
63 * a picture to, for example, crop image without any memcpy, the picture origin
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64 * and dimensions are per-reference properties. Linesize is also useful for
65 * image flipping, frame to field filters, etc, and so is also per-reference.
a5cbb2f4 66 *
1a18860a 67 * TODO: add anything necessary for frame reordering
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68 */
69typedef struct AVFilterPicRef
70{
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71 AVFilterPic *pic; ///< the picture that this is a reference to
72 uint8_t *data[4]; ///< picture data for each plane
73 int linesize[4]; ///< number of bytes per line
74 int w; ///< image width
75 int h; ///< image height
a5cbb2f4 76
056f0431 77 int64_t pts; ///< presentation timestamp in units of 1/AV_TIME_BASE
1a18860a 78
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79 AVRational pixel_aspect; ///< pixel aspect ratio
80
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81 int perms; ///< permissions
82#define AV_PERM_READ 0x01 ///< can read from the buffer
83#define AV_PERM_WRITE 0x02 ///< can write to the buffer
84#define AV_PERM_PRESERVE 0x04 ///< nobody else can overwrite the buffer
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85#define AV_PERM_REUSE 0x08 ///< can output the buffer multiple times, with the same contents each time
86#define AV_PERM_REUSE2 0x10 ///< can output the buffer multiple times, modified each time
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87} AVFilterPicRef;
88
89/**
90 * Add a new reference to a picture.
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91 * @param ref an existing reference to the picture
92 * @param pmask a bitmask containing the allowable permissions in the new
13ff8fd0 93 * reference
664f6595 94 * @return a new reference to the picture with the same properties as the
13ff8fd0 95 * old, excluding any permissions denied by pmask
a5cbb2f4 96 */
16415eaf 97AVFilterPicRef *avfilter_ref_pic(AVFilterPicRef *ref, int pmask);
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98
99/**
100 * Remove a reference to a picture. If this is the last reference to the
101 * picture, the picture itself is also automatically freed.
664f6595 102 * @param ref reference to the picture
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103 */
104void avfilter_unref_pic(AVFilterPicRef *ref);
105
13ff8fd0 106/**
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107 * A list of supported formats for one end of a filter link. This is used
108 * during the format negotiation process to try to pick the best format to
109 * use to minimize the number of necessary conversions. Each filter gives a
110 * list of the formats supported by each input and output pad. The list
111 * given for each pad need not be distinct - they may be references to the
112 * same list of formats, as is often the case when a filter supports multiple
113 * formats, but will always outut the same format as it is given in input.
114 *
115 * In this way, a list of possible input formats and a list of possible
116 * output formats are associated with each link. When a set of formats is
117 * negotiated over a link, the input and output lists are merged to form a
118 * new list containing only the common elements of each list. In the case
119 * that there were no common elements, a format conversion is necessary.
120 * Otherwise, the lists are merged, and all other links which reference
121 * either of the format lists involved in the merge are also affected.
122 *
123 * For example, consider the filter chain:
124 * filter (a) --> (b) filter (b) --> (c) filter
125 *
126 * where the letters in parenthesis indicate a list of formats supported on
127 * the input or output of the link. Suppose the lists are as follows:
128 * (a) = {A, B}
129 * (b) = {A, B, C}
130 * (c) = {B, C}
131 *
132 * First, the first link's lists are merged, yielding:
133 * filter (a) --> (a) filter (a) --> (c) filter
134 *
135 * Notice that format list (b) now refers to the same list as filter list (a).
136 * Next, the lists for the second link are merged, yielding:
137 * filter (a) --> (a) filter (a) --> (a) filter
138 *
139 * where (a) = {B}.
140 *
141 * Unfortunately, when the format lists at the two ends of a link are merged,
142 * we must ensure that all links which reference either pre-merge format list
143 * get updated as well. Therefore, we have the format list structure store a
144 * pointer to each of the pointers to itself.
145 */
146typedef struct AVFilterFormats AVFilterFormats;
147struct AVFilterFormats
148{
149 unsigned format_count; ///< number of formats
150 int *formats; ///< list of formats
151
152 unsigned refcount; ///< number of references to this list
153 AVFilterFormats ***refs; ///< references to this list
154};
155
156/**
157 * Helper function to create a list of supported formats. This is intended
158 * for use in AVFilter->query_formats().
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159 * @param len the number of formats supported
160 * @param ... a list of the supported formats
161 * @return the format list, with no existing references
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162 */
163AVFilterFormats *avfilter_make_format_list(int len, ...);
164
165/**
853961a9 166 * Returns a list of all colorspaces supported by FFmpeg.
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167 */
168AVFilterFormats *avfilter_all_colorspaces(void);
169
170/**
171 * If a and b share at least one common format, they are merged into a new
172 * format list which is returned. All the references to a and b are updated
173 * to point to this new list, and a and b are deallocated.
174 *
175 * If a and b do not share any common formats, neither is modified, and NULL
176 * is returned.
177 */
178AVFilterFormats *avfilter_merge_formats(AVFilterFormats *a, AVFilterFormats *b);
179
180/** Adds *ref as a new reference to f */
181void avfilter_formats_ref(AVFilterFormats *f, AVFilterFormats **ref);
182
183/**
184 * Remove *ref as a reference to the format list it currently points to,
664f6595 185 * deallocate that list if this was the last reference, and set *ref to NULL.
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186 */
187void avfilter_formats_unref(AVFilterFormats **ref);
188
189/**
664f6595 190 * A filter pad used for either input or output.
13ff8fd0 191 */
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192struct AVFilterPad
193{
194 /**
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195 * Pad name. The name is unique among inputs and among outputs, but an
196 * input may have the same name as an output. This may be NULL if this
197 * pad has no need to ever be referenced by name.
a5cbb2f4 198 */
2844dd39 199 const char *name;
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200
201 /**
202 * AVFilterPad type. Only video supported now, hopefully someone will
203 * add audio in the future.
204 */
daafdb6e 205 enum CodecType type;
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206
207 /**
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208 * Minimum required permissions on incoming buffers. Any buffers with
209 * insufficient permissions will be automatically copied by the filter
210 * system to a new buffer which provides the needed access permissions.
211 *
212 * Input pads only.
213 */
214 int min_perms;
215
216 /**
217 * Permissions which are not accepted on incoming buffers. Any buffer
218 * which has any of these permissions set be automatically copied by the
219 * filter system to a new buffer which does not have those permissions.
220 * This can be used to easily disallow buffers with AV_PERM_REUSE.
221 *
222 * Input pads only.
223 */
224 int rej_perms;
225
226 /**
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227 * Callback called before passing the first slice of a new frame. If
228 * NULL, the filter layer will default to storing a reference to the
229 * picture inside the link structure.
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230 *
231 * Input video pads only.
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232 */
233 void (*start_frame)(AVFilterLink *link, AVFilterPicRef *picref);
234
235 /**
236 * Callback function to get a buffer. If NULL, the filter system will
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237 * handle buffer requests.
238 *
239 * Input video pads only.
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240 */
241 AVFilterPicRef *(*get_video_buffer)(AVFilterLink *link, int perms);
242
243 /**
244 * Callback called after the slices of a frame are completely sent. If
245 * NULL, the filter layer will default to releasing the reference stored
246 * in the link structure during start_frame().
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247 *
248 * Input video pads only.
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249 */
250 void (*end_frame)(AVFilterLink *link);
251
252 /**
253 * Slice drawing callback. This is where a filter receives video data
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254 * and should do its processing.
255 *
256 * Input video pads only.
a5cbb2f4 257 */
72f6d631 258 void (*draw_slice)(AVFilterLink *link, int y, int height);
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259
260 /**
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261 * Frame poll callback. This returns the number of immediately available
262 * frames. It should return a positive value if the next request_frame()
263 * is guaranteed to return one frame (with no delay).
264 *
265 * Defaults to just calling the source poll_frame() method.
266 *
267 * Output video pads only.
268 */
269 int (*poll_frame)(AVFilterLink *link);
270
271 /**
a5cbb2f4 272 * Frame request callback. A call to this should result in at least one
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273 * frame being output over the given link. This should return zero on
274 * success, and another value on error.
275 *
276 * Output video pads only.
a5cbb2f4 277 */
63f64e6f 278 int (*request_frame)(AVFilterLink *link);
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279
280 /**
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281 * Link configuration callback.
282 *
283 * For output pads, this should set the link properties such as
284 * width/height. This should NOT set the format property - that is
285 * negotiated between filters by the filter system using the
286 * query_formats() callback before this function is called.
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287 *
288 * For input pads, this should check the properties of the link, and update
289 * the filter's internal state as necessary.
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290 *
291 * For both input and output filters, this should return zero on success,
292 * and another value on error.
a5cbb2f4 293 */
d3e57c15 294 int (*config_props)(AVFilterLink *link);
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295};
296
13ff8fd0 297/** Default handler for start_frame() for video inputs */
a5cbb2f4 298void avfilter_default_start_frame(AVFilterLink *link, AVFilterPicRef *picref);
13ff8fd0 299/** Default handler for end_frame() for video inputs */
a5cbb2f4 300void avfilter_default_end_frame(AVFilterLink *link);
13ff8fd0 301/** Default handler for config_props() for video outputs */
901e6b39 302int avfilter_default_config_output_link(AVFilterLink *link);
13ff8fd0 303/** Default handler for config_props() for video inputs */
85322466 304int avfilter_default_config_input_link (AVFilterLink *link);
13ff8fd0 305/** Default handler for get_video_buffer() for video inputs */
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306AVFilterPicRef *avfilter_default_get_video_buffer(AVFilterLink *link,
307 int perms);
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308/**
309 * A helper for query_formats() which sets all links to the same list of
310 * formats. If there are no links hooked to this filter, the list of formats is
311 * freed.
312 */
313void avfilter_set_common_formats(AVFilterContext *ctx, AVFilterFormats *formats);
314/** Default handler for query_formats() */
315int avfilter_default_query_formats(AVFilterContext *ctx);
a5cbb2f4 316
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317void avfilter_formats_changeref(AVFilterFormats **oldref,
318 AVFilterFormats **newref);
319
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320/**
321 * Filter definition. This defines the pads a filter contains, and all the
322 * callback functions used to interact with the filter.
323 */
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324typedef struct
325{
2844dd39 326 const char *name; ///< filter name
a5cbb2f4 327
13ff8fd0 328 int priv_size; ///< size of private data to allocate for the filter
a5cbb2f4 329
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330 /**
331 * Filter initialization function. Args contains the user-supplied
332 * parameters. FIXME: maybe an AVOption-based system would be better?
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333 * opaque is data provided by the code requesting creation of the filter,
334 * and is used to pass data to the filter.
4d96a914 335 */
95bcf498 336 int (*init)(AVFilterContext *ctx, const char *args, void *opaque);
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337
338 /**
339 * Filter uninitialization function. Should deallocate any memory held
340 * by the filter, release any picture references, etc. This does not need
341 * to deallocate the AVFilterContext->priv memory itself.
342 */
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343 void (*uninit)(AVFilterContext *ctx);
344
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345 /**
346 * Query formats supported by the filter and its pads. Should set the
347 * in_formats for links connected to its output pads, and out_formats
348 * for links connected to its input pads.
349 *
350 * Should return zero on success.
351 */
352 int (*query_formats)(AVFilterContext *);
353
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354 const AVFilterPad *inputs; ///< NULL terminated list of inputs. NULL if none
355 const AVFilterPad *outputs; ///< NULL terminated list of outputs. NULL if none
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356} AVFilter;
357
13ff8fd0 358/** An instance of a filter */
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359struct AVFilterContext
360{
664f6595 361 AVClass *av_class; ///< needed for av_log()
a5cbb2f4 362
664f6595 363 AVFilter *filter; ///< the AVFilter of which this is an instance
a5cbb2f4 364
13ff8fd0 365 char *name; ///< name of this filter instance
dcea2482 366
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367 unsigned input_count; ///< number of input pads
368 AVFilterPad *input_pads; ///< array of input pads
369 AVFilterLink **inputs; ///< array of pointers to input links
25f8e601 370
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371 unsigned output_count; ///< number of output pads
372 AVFilterPad *output_pads; ///< array of output pads
373 AVFilterLink **outputs; ///< array of pointers to output links
a5cbb2f4 374
13ff8fd0 375 void *priv; ///< private data for use by the filter
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376};
377
13ff8fd0 378/**
664f6595 379 * A link between two filters. This contains pointers to the source and
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380 * destination filters between which this link exists, and the indices of
381 * the pads involved. In addition, this link also contains the parameters
382 * which have been negotiated and agreed upon between the filter, such as
383 * image dimensions, format, etc
384 */
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385struct AVFilterLink
386{
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387 AVFilterContext *src; ///< source filter
388 unsigned int srcpad; ///< index of the output pad on the source filter
a5cbb2f4 389
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390 AVFilterContext *dst; ///< dest filter
391 unsigned int dstpad; ///< index of the input pad on the dest filter
a5cbb2f4 392
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393 /** stage of the initialization of the link properties (dimensions, etc) */
394 enum {
395 AVLINK_UNINIT = 0, ///< not started
396 AVLINK_STARTINIT, ///< started, but incomplete
397 AVLINK_INIT ///< complete
398 } init_state;
399
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400 int w; ///< agreed upon image width
401 int h; ///< agreed upon image height
402 enum PixelFormat format; ///< agreed upon image colorspace
a5cbb2f4 403
60bf6ce3 404 /**
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405 * Lists of formats supported by the input and output filters respectively.
406 * These lists are used for negotiating the format to actually be used,
407 * which will be loaded into the format member, above, when chosen.
408 */
409 AVFilterFormats *in_formats;
410 AVFilterFormats *out_formats;
411
412 /**
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413 * The picture reference currently being sent across the link by the source
414 * filter. This is used internally by the filter system to allow
664f6595 415 * automatic copying of pictures which do not have sufficient permissions
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416 * for the destination. This should not be accessed directly by the
417 * filters.
418 */
419 AVFilterPicRef *srcpic;
420
a5cbb2f4 421 AVFilterPicRef *cur_pic;
462f57db 422 AVFilterPicRef *outpic;
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423};
424
13ff8fd0 425/**
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426 * Link two filters together.
427 * @param src the source filter
428 * @param srcpad index of the output pad on the source filter
429 * @param dst the destination filter
430 * @param dstpad index of the input pad on the destination filter
431 * @return zero on success
13ff8fd0 432 */
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433int avfilter_link(AVFilterContext *src, unsigned srcpad,
434 AVFilterContext *dst, unsigned dstpad);
435
13ff8fd0 436/**
24c4eff6 437 * Negotiate the colorspace, dimensions, etc of all inputs to a filter.
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438 * @param filter the filter to negotiate the properties for its inputs
439 * @return zero on successful negotiation
13ff8fd0 440 */
24c4eff6 441int avfilter_config_links(AVFilterContext *filter);
85322466 442
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443/**
444 * Request a picture buffer with a specific set of permissions
664f6595 445 * @param link the output link to the filter from which the picture will
13ff8fd0 446 * be requested
664f6595 447 * @param perms the required access permissions
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448 * @return A reference to the picture. This must be unreferenced with
449 * avfilter_unref_pic when you are finished with it.
450 */
a5cbb2f4 451AVFilterPicRef *avfilter_get_video_buffer(AVFilterLink *link, int perms);
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452
453/**
454 * Request an input frame from the filter at the other end of the link.
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455 * @param link the input link
456 * @return zero on success
13ff8fd0 457 */
0155b1a1 458int avfilter_request_frame(AVFilterLink *link);
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459
460/**
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461 * Poll a frame from the filter chain.
462 * @param link the input link
463 * @return the number of imediately available frames
464 */
465int avfilter_poll_frame(AVFilterLink *link);
466
467/**
b42a6a92 468 * Notify the next filter of the start of a frame.
664f6595 469 * @param link the output link the frame will be sent over
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470 * @param picref A reference to the frame about to be sent. The data for this
471 * frame need only be valid once draw_slice() is called for that
472 * portion. The receiving filter will free this reference when
473 * it no longer needs it.
474 */
a5cbb2f4 475void avfilter_start_frame(AVFilterLink *link, AVFilterPicRef *picref);
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476
477/**
478 * Notify the next filter that the current frame has finished
664f6595 479 * @param link the output link the frame was sent over
13ff8fd0 480 */
a5cbb2f4 481void avfilter_end_frame(AVFilterLink *link);
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482
483/**
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484 * Send a slice to the next filter.
485 * @param link the output link over which the frame is being sent
486 * @param y offset in pixels from the top of the image for this slice
487 * @param h height of this slice in pixels
13ff8fd0 488 */
72f6d631 489void avfilter_draw_slice(AVFilterLink *link, int y, int h);
a5cbb2f4 490
13ff8fd0 491/** Initialize the filter system. Registers all builtin filters */
a5cbb2f4 492void avfilter_init(void);
13ff8fd0 493
e4152452 494/** Initialize the filter system. Registers all builtin filters */
11de6cac 495void avfilter_register_all(void);
e4152452 496
13ff8fd0 497/** Uninitialize the filter system. Unregisters all filters */
a5cbb2f4 498void avfilter_uninit(void);
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499
500/**
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501 * Register a filter. This is only needed if you plan to use
502 * avfilter_get_by_name later to lookup the AVFilter structure by name. A
503 * filter can still by instantiated with avfilter_open even if it is not
504 * registered.
664f6595 505 * @param filter the filter to register
13ff8fd0 506 */
a5cbb2f4 507void avfilter_register(AVFilter *filter);
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508
509/**
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510 * Gets a filter definition matching the given name.
511 * @param name the filter name to find
512 * @return the filter definition, if any matching one is registered.
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513 * NULL if none found.
514 */
2844dd39 515AVFilter *avfilter_get_by_name(const char *name);
a5cbb2f4 516
13ff8fd0 517/**
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518 * Create a filter instance.
519 * @param filter the filter to create an instance of
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520 * @param inst_name Name to give to the new instance. Can be NULL for none.
521 * @return Pointer to the new instance on success. NULL on failure.
522 */
2844dd39 523AVFilterContext *avfilter_open(AVFilter *filter, const char *inst_name);
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524
525/**
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526 * Initialize a filter.
527 * @param filter the filter to initialize
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528 * @param args A string of parameters to use when initializing the filter.
529 * The format and meaning of this string varies by filter.
530 * @param opaque Any extra non-string data needed by the filter. The meaning
531 * of this parameter varies by filter.
664f6595 532 * @return zero on success
13ff8fd0 533 */
6e365c57 534int avfilter_init_filter(AVFilterContext *filter, const char *args, void *opaque);
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535
536/**
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537 * Destroy a filter.
538 * @param filter the filter to destroy
13ff8fd0 539 */
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540void avfilter_destroy(AVFilterContext *filter);
541
13ff8fd0 542/**
35f3fdf4 543 * Insert a filter in the middle of an existing link.
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544 * @param link the link into which the filter should be inserted
545 * @param filt the filter to be inserted
546 * @param in the input pad on the filter to connect
547 * @param out the output pad on the filter to connect
548 * @return zero on success
13ff8fd0 549 */
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550int avfilter_insert_filter(AVFilterLink *link, AVFilterContext *filt,
551 unsigned in, unsigned out);
d3e57c15 552
a9c81431 553/**
664f6595 554 * Insert a new pad.
a9c81431
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555 * @param idx Insertion point. Pad is inserted at the end if this point
556 * is beyond the end of the list of pads.
557 * @param count Pointer to the number of pads in the list
558 * @param padidx_off Offset within an AVFilterLink structure to the element
559 * to increment when inserting a new pad causes link
560 * numbering to change
561 * @param pads Pointer to the pointer to the beginning of the list of pads
562 * @param links Pointer to the pointer to the beginning of the list of links
563 * @param newpad The new pad to add. A copy is made when adding.
564 */
565void avfilter_insert_pad(unsigned idx, unsigned *count, size_t padidx_off,
566 AVFilterPad **pads, AVFilterLink ***links,
567 AVFilterPad *newpad);
568
569/** insert a new input pad for the filter */
570static inline void avfilter_insert_inpad(AVFilterContext *f, unsigned index,
571 AVFilterPad *p)
572{
573 avfilter_insert_pad(index, &f->input_count, offsetof(AVFilterLink, dstpad),
574 &f->input_pads, &f->inputs, p);
575}
576
577/** insert a new output pad for the filter */
578static inline void avfilter_insert_outpad(AVFilterContext *f, unsigned index,
579 AVFilterPad *p)
580{
581 avfilter_insert_pad(index, &f->output_count, offsetof(AVFilterLink, srcpad),
582 &f->output_pads, &f->outputs, p);
583}
584
a5cbb2f4 585#endif /* FFMPEG_AVFILTER_H */