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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/**
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171 * Returns a format list which contains the intersection of the formats of
172 * a and b. And all the references of a and b, and a and b will be
173 * deallocated.
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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
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180/**
181 * Adds *ref as a new reference to f.
182 * That is the pointers will point like in the ascii art below:
183 * ________
184 * | f |<--------.
185 * | ____ | |
186 * | |refs| | __|_
187 * | |* * | | | | |
188 * | |* *--------->|*ref|
189 * | |____| | |____|
190 * |________|
191 */
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192void avfilter_formats_ref(AVFilterFormats *f, AVFilterFormats **ref);
193
194/**
195 * Remove *ref as a reference to the format list it currently points to,
664f6595 196 * deallocate that list if this was the last reference, and set *ref to NULL.
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197 */
198void avfilter_formats_unref(AVFilterFormats **ref);
199
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200void avfilter_formats_changeref(AVFilterFormats **oldref,
201 AVFilterFormats **newref);
202
35f3fdf4 203/**
664f6595 204 * A filter pad used for either input or output.
13ff8fd0 205 */
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206struct AVFilterPad
207{
208 /**
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209 * Pad name. The name is unique among inputs and among outputs, but an
210 * input may have the same name as an output. This may be NULL if this
211 * pad has no need to ever be referenced by name.
a5cbb2f4 212 */
2844dd39 213 const char *name;
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214
215 /**
216 * AVFilterPad type. Only video supported now, hopefully someone will
217 * add audio in the future.
218 */
daafdb6e 219 enum CodecType type;
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220
221 /**
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222 * Minimum required permissions on incoming buffers. Any buffers with
223 * insufficient permissions will be automatically copied by the filter
224 * system to a new buffer which provides the needed access permissions.
225 *
226 * Input pads only.
227 */
228 int min_perms;
229
230 /**
231 * Permissions which are not accepted on incoming buffers. Any buffer
232 * which has any of these permissions set be automatically copied by the
233 * filter system to a new buffer which does not have those permissions.
234 * This can be used to easily disallow buffers with AV_PERM_REUSE.
235 *
236 * Input pads only.
237 */
238 int rej_perms;
239
240 /**
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241 * Callback called before passing the first slice of a new frame. If
242 * NULL, the filter layer will default to storing a reference to the
243 * picture inside the link structure.
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244 *
245 * Input video pads only.
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246 */
247 void (*start_frame)(AVFilterLink *link, AVFilterPicRef *picref);
248
249 /**
250 * Callback function to get a buffer. If NULL, the filter system will
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251 * handle buffer requests.
252 *
253 * Input video pads only.
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254 */
255 AVFilterPicRef *(*get_video_buffer)(AVFilterLink *link, int perms);
256
257 /**
258 * Callback called after the slices of a frame are completely sent. If
259 * NULL, the filter layer will default to releasing the reference stored
260 * in the link structure during start_frame().
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261 *
262 * Input video pads only.
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263 */
264 void (*end_frame)(AVFilterLink *link);
265
266 /**
267 * Slice drawing callback. This is where a filter receives video data
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268 * and should do its processing.
269 *
270 * Input video pads only.
a5cbb2f4 271 */
72f6d631 272 void (*draw_slice)(AVFilterLink *link, int y, int height);
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273
274 /**
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275 * Frame poll callback. This returns the number of immediately available
276 * frames. It should return a positive value if the next request_frame()
277 * is guaranteed to return one frame (with no delay).
278 *
279 * Defaults to just calling the source poll_frame() method.
280 *
281 * Output video pads only.
282 */
283 int (*poll_frame)(AVFilterLink *link);
284
285 /**
a5cbb2f4 286 * Frame request callback. A call to this should result in at least one
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287 * frame being output over the given link. This should return zero on
288 * success, and another value on error.
289 *
290 * Output video pads only.
a5cbb2f4 291 */
63f64e6f 292 int (*request_frame)(AVFilterLink *link);
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293
294 /**
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295 * Link configuration callback.
296 *
297 * For output pads, this should set the link properties such as
298 * width/height. This should NOT set the format property - that is
299 * negotiated between filters by the filter system using the
300 * query_formats() callback before this function is called.
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301 *
302 * For input pads, this should check the properties of the link, and update
303 * the filter's internal state as necessary.
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304 *
305 * For both input and output filters, this should return zero on success,
306 * and another value on error.
a5cbb2f4 307 */
d3e57c15 308 int (*config_props)(AVFilterLink *link);
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309};
310
13ff8fd0 311/** Default handler for start_frame() for video inputs */
a5cbb2f4 312void avfilter_default_start_frame(AVFilterLink *link, AVFilterPicRef *picref);
13ff8fd0 313/** Default handler for end_frame() for video inputs */
a5cbb2f4 314void avfilter_default_end_frame(AVFilterLink *link);
13ff8fd0 315/** Default handler for config_props() for video outputs */
901e6b39 316int avfilter_default_config_output_link(AVFilterLink *link);
13ff8fd0 317/** Default handler for config_props() for video inputs */
85322466 318int avfilter_default_config_input_link (AVFilterLink *link);
13ff8fd0 319/** Default handler for get_video_buffer() for video inputs */
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320AVFilterPicRef *avfilter_default_get_video_buffer(AVFilterLink *link,
321 int perms);
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322/**
323 * A helper for query_formats() which sets all links to the same list of
324 * formats. If there are no links hooked to this filter, the list of formats is
325 * freed.
326 */
327void avfilter_set_common_formats(AVFilterContext *ctx, AVFilterFormats *formats);
328/** Default handler for query_formats() */
329int avfilter_default_query_formats(AVFilterContext *ctx);
a5cbb2f4 330
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331/**
332 * Filter definition. This defines the pads a filter contains, and all the
333 * callback functions used to interact with the filter.
334 */
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335typedef struct
336{
2844dd39 337 const char *name; ///< filter name
a5cbb2f4 338
13ff8fd0 339 int priv_size; ///< size of private data to allocate for the filter
a5cbb2f4 340
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341 /**
342 * Filter initialization function. Args contains the user-supplied
343 * parameters. FIXME: maybe an AVOption-based system would be better?
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344 * opaque is data provided by the code requesting creation of the filter,
345 * and is used to pass data to the filter.
4d96a914 346 */
95bcf498 347 int (*init)(AVFilterContext *ctx, const char *args, void *opaque);
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348
349 /**
350 * Filter uninitialization function. Should deallocate any memory held
351 * by the filter, release any picture references, etc. This does not need
352 * to deallocate the AVFilterContext->priv memory itself.
353 */
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354 void (*uninit)(AVFilterContext *ctx);
355
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356 /**
357 * Query formats supported by the filter and its pads. Should set the
358 * in_formats for links connected to its output pads, and out_formats
359 * for links connected to its input pads.
360 *
361 * Should return zero on success.
362 */
363 int (*query_formats)(AVFilterContext *);
364
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365 const AVFilterPad *inputs; ///< NULL terminated list of inputs. NULL if none
366 const AVFilterPad *outputs; ///< NULL terminated list of outputs. NULL if none
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367} AVFilter;
368
13ff8fd0 369/** An instance of a filter */
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370struct AVFilterContext
371{
664f6595 372 AVClass *av_class; ///< needed for av_log()
a5cbb2f4 373
664f6595 374 AVFilter *filter; ///< the AVFilter of which this is an instance
a5cbb2f4 375
13ff8fd0 376 char *name; ///< name of this filter instance
dcea2482 377
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378 unsigned input_count; ///< number of input pads
379 AVFilterPad *input_pads; ///< array of input pads
380 AVFilterLink **inputs; ///< array of pointers to input links
25f8e601 381
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382 unsigned output_count; ///< number of output pads
383 AVFilterPad *output_pads; ///< array of output pads
384 AVFilterLink **outputs; ///< array of pointers to output links
a5cbb2f4 385
13ff8fd0 386 void *priv; ///< private data for use by the filter
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387};
388
13ff8fd0 389/**
664f6595 390 * A link between two filters. This contains pointers to the source and
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391 * destination filters between which this link exists, and the indices of
392 * the pads involved. In addition, this link also contains the parameters
393 * which have been negotiated and agreed upon between the filter, such as
394 * image dimensions, format, etc
395 */
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396struct AVFilterLink
397{
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398 AVFilterContext *src; ///< source filter
399 unsigned int srcpad; ///< index of the output pad on the source filter
a5cbb2f4 400
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401 AVFilterContext *dst; ///< dest filter
402 unsigned int dstpad; ///< index of the input pad on the dest filter
a5cbb2f4 403
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404 /** stage of the initialization of the link properties (dimensions, etc) */
405 enum {
406 AVLINK_UNINIT = 0, ///< not started
407 AVLINK_STARTINIT, ///< started, but incomplete
408 AVLINK_INIT ///< complete
409 } init_state;
410
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411 int w; ///< agreed upon image width
412 int h; ///< agreed upon image height
413 enum PixelFormat format; ///< agreed upon image colorspace
a5cbb2f4 414
60bf6ce3 415 /**
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416 * Lists of formats supported by the input and output filters respectively.
417 * These lists are used for negotiating the format to actually be used,
418 * which will be loaded into the format member, above, when chosen.
419 */
420 AVFilterFormats *in_formats;
421 AVFilterFormats *out_formats;
422
423 /**
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424 * The picture reference currently being sent across the link by the source
425 * filter. This is used internally by the filter system to allow
664f6595 426 * automatic copying of pictures which do not have sufficient permissions
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427 * for the destination. This should not be accessed directly by the
428 * filters.
429 */
430 AVFilterPicRef *srcpic;
431
a5cbb2f4 432 AVFilterPicRef *cur_pic;
462f57db 433 AVFilterPicRef *outpic;
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434};
435
13ff8fd0 436/**
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437 * Link two filters together.
438 * @param src the source filter
439 * @param srcpad index of the output pad on the source filter
440 * @param dst the destination filter
441 * @param dstpad index of the input pad on the destination filter
442 * @return zero on success
13ff8fd0 443 */
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444int avfilter_link(AVFilterContext *src, unsigned srcpad,
445 AVFilterContext *dst, unsigned dstpad);
446
13ff8fd0 447/**
24c4eff6 448 * Negotiate the colorspace, dimensions, etc of all inputs to a filter.
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449 * @param filter the filter to negotiate the properties for its inputs
450 * @return zero on successful negotiation
13ff8fd0 451 */
24c4eff6 452int avfilter_config_links(AVFilterContext *filter);
85322466 453
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454/**
455 * Request a picture buffer with a specific set of permissions
664f6595 456 * @param link the output link to the filter from which the picture will
13ff8fd0 457 * be requested
664f6595 458 * @param perms the required access permissions
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459 * @return A reference to the picture. This must be unreferenced with
460 * avfilter_unref_pic when you are finished with it.
461 */
a5cbb2f4 462AVFilterPicRef *avfilter_get_video_buffer(AVFilterLink *link, int perms);
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463
464/**
465 * Request an input frame from the filter at the other end of the link.
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466 * @param link the input link
467 * @return zero on success
13ff8fd0 468 */
0155b1a1 469int avfilter_request_frame(AVFilterLink *link);
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470
471/**
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472 * Poll a frame from the filter chain.
473 * @param link the input link
474 * @return the number of imediately available frames
475 */
476int avfilter_poll_frame(AVFilterLink *link);
477
478/**
b42a6a92 479 * Notify the next filter of the start of a frame.
664f6595 480 * @param link the output link the frame will be sent over
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481 * @param picref A reference to the frame about to be sent. The data for this
482 * frame need only be valid once draw_slice() is called for that
483 * portion. The receiving filter will free this reference when
484 * it no longer needs it.
485 */
a5cbb2f4 486void avfilter_start_frame(AVFilterLink *link, AVFilterPicRef *picref);
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487
488/**
489 * Notify the next filter that the current frame has finished
664f6595 490 * @param link the output link the frame was sent over
13ff8fd0 491 */
a5cbb2f4 492void avfilter_end_frame(AVFilterLink *link);
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493
494/**
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495 * Send a slice to the next filter.
496 * @param link the output link over which the frame is being sent
497 * @param y offset in pixels from the top of the image for this slice
498 * @param h height of this slice in pixels
13ff8fd0 499 */
72f6d631 500void avfilter_draw_slice(AVFilterLink *link, int y, int h);
a5cbb2f4 501
13ff8fd0 502/** Initialize the filter system. Registers all builtin filters */
11de6cac 503void avfilter_register_all(void);
e4152452 504
13ff8fd0 505/** Uninitialize the filter system. Unregisters all filters */
a5cbb2f4 506void avfilter_uninit(void);
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507
508/**
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509 * Register a filter. This is only needed if you plan to use
510 * avfilter_get_by_name later to lookup the AVFilter structure by name. A
511 * filter can still by instantiated with avfilter_open even if it is not
512 * registered.
664f6595 513 * @param filter the filter to register
13ff8fd0 514 */
a5cbb2f4 515void avfilter_register(AVFilter *filter);
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516
517/**
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518 * Gets a filter definition matching the given name.
519 * @param name the filter name to find
520 * @return the filter definition, if any matching one is registered.
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521 * NULL if none found.
522 */
2844dd39 523AVFilter *avfilter_get_by_name(const char *name);
a5cbb2f4 524
13ff8fd0 525/**
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526 * Create a filter instance.
527 * @param filter the filter to create an instance of
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528 * @param inst_name Name to give to the new instance. Can be NULL for none.
529 * @return Pointer to the new instance on success. NULL on failure.
530 */
2844dd39 531AVFilterContext *avfilter_open(AVFilter *filter, const char *inst_name);
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532
533/**
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534 * Initialize a filter.
535 * @param filter the filter to initialize
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536 * @param args A string of parameters to use when initializing the filter.
537 * The format and meaning of this string varies by filter.
538 * @param opaque Any extra non-string data needed by the filter. The meaning
539 * of this parameter varies by filter.
664f6595 540 * @return zero on success
13ff8fd0 541 */
6e365c57 542int avfilter_init_filter(AVFilterContext *filter, const char *args, void *opaque);
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543
544/**
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545 * Destroy a filter.
546 * @param filter the filter to destroy
13ff8fd0 547 */
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548void avfilter_destroy(AVFilterContext *filter);
549
13ff8fd0 550/**
35f3fdf4 551 * Insert a filter in the middle of an existing link.
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552 * @param link the link into which the filter should be inserted
553 * @param filt the filter to be inserted
554 * @param in the input pad on the filter to connect
555 * @param out the output pad on the filter to connect
556 * @return zero on success
13ff8fd0 557 */
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558int avfilter_insert_filter(AVFilterLink *link, AVFilterContext *filt,
559 unsigned in, unsigned out);
d3e57c15 560
a9c81431 561/**
664f6595 562 * Insert a new pad.
a9c81431
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563 * @param idx Insertion point. Pad is inserted at the end if this point
564 * is beyond the end of the list of pads.
565 * @param count Pointer to the number of pads in the list
566 * @param padidx_off Offset within an AVFilterLink structure to the element
567 * to increment when inserting a new pad causes link
568 * numbering to change
569 * @param pads Pointer to the pointer to the beginning of the list of pads
570 * @param links Pointer to the pointer to the beginning of the list of links
571 * @param newpad The new pad to add. A copy is made when adding.
572 */
573void avfilter_insert_pad(unsigned idx, unsigned *count, size_t padidx_off,
574 AVFilterPad **pads, AVFilterLink ***links,
575 AVFilterPad *newpad);
576
577/** insert a new input pad for the filter */
578static inline void avfilter_insert_inpad(AVFilterContext *f, unsigned index,
579 AVFilterPad *p)
580{
581 avfilter_insert_pad(index, &f->input_count, offsetof(AVFilterLink, dstpad),
582 &f->input_pads, &f->inputs, p);
583}
584
585/** insert a new output pad for the filter */
586static inline void avfilter_insert_outpad(AVFilterContext *f, unsigned index,
587 AVFilterPad *p)
588{
589 avfilter_insert_pad(index, &f->output_count, offsetof(AVFilterLink, srcpad),
590 &f->output_pads, &f->outputs, p);
591}
592
a5cbb2f4 593#endif /* FFMPEG_AVFILTER_H */