avplay: use buffersrc instead of custom input filter.
[libav.git] / libavfilter / avfilter.h
CommitLineData
a5cbb2f4 1/*
664f6595 2 * filter layer
3fa77bde 3 * Copyright (c) 2007 Bobby Bingham
a5cbb2f4 4 *
2912e87a 5 * This file is part of Libav.
a5cbb2f4 6 *
2912e87a 7 * Libav is free software; you can redistribute it and/or
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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 *
2912e87a 12 * Libav is distributed in the hope that it will be useful,
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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
2912e87a 18 * License along with Libav; if not, write to the Free Software
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19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
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22#ifndef AVFILTER_AVFILTER_H
23#define AVFILTER_AVFILTER_H
a5cbb2f4 24
1f20782c 25#include "libavutil/avutil.h"
abc78a5a 26#include "libavutil/log.h"
737eb597 27#include "libavutil/samplefmt.h"
d49ea4af 28#include "libavutil/pixfmt.h"
e91709ca 29#include "libavutil/rational.h"
1c9e340d 30#include "libavcodec/avcodec.h"
1f20782c 31
a9c81431 32#include <stddef.h>
a5cbb2f4 33
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34#include "libavfilter/version.h"
35
540f1c7b 36/**
49bd8e4b 37 * Return the LIBAVFILTER_VERSION_INT constant.
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38 */
39unsigned avfilter_version(void);
40
c1736936 41/**
49bd8e4b 42 * Return the libavfilter build-time configuration.
c1736936 43 */
41600690 44const char *avfilter_configuration(void);
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45
46/**
49bd8e4b 47 * Return the libavfilter license.
c1736936 48 */
41600690 49const char *avfilter_license(void);
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50
51
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52typedef struct AVFilterContext AVFilterContext;
53typedef struct AVFilterLink AVFilterLink;
54typedef struct AVFilterPad AVFilterPad;
55
a5cbb2f4 56/**
32d7bcd4 57 * A reference-counted buffer data type used by the filter system. Filters
a5cbb2f4 58 * should not store pointers to this structure directly, but instead use the
ecc8dada 59 * AVFilterBufferRef structure below.
a5cbb2f4 60 */
f607cc18 61typedef struct AVFilterBuffer {
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62 uint8_t *data[8]; ///< buffer data for each plane/channel
63 int linesize[8]; ///< number of bytes per line
a5cbb2f4 64
32d7bcd4 65 unsigned refcount; ///< number of references to this buffer
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66
67 /** private data to be used by a custom free function */
a5cbb2f4 68 void *priv;
13ff8fd0 69 /**
32d7bcd4 70 * A pointer to the function to deallocate this buffer if the default
38efe768 71 * function is not sufficient. This could, for example, add the memory
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72 * back into a memory pool to be reused later without the overhead of
73 * reallocating it from scratch.
74 */
32d7bcd4 75 void (*free)(struct AVFilterBuffer *buf);
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76
77 int format; ///< media format
78 int w, h; ///< width and height of the allocated buffer
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79
80 /**
81 * pointers to the data planes/channels.
82 *
83 * For video, this should simply point to data[].
84 *
85 * For planar audio, each channel has a separate data pointer, and
86 * linesize[0] contains the size of each channel buffer.
87 * For packed audio, there is just one data pointer, and linesize[0]
88 * contains the total size of the buffer for all channels.
89 *
90 * Note: Both data and extended_data will always be set, but for planar
91 * audio with more channels that can fit in data, extended_data must be used
92 * in order to access all channels.
93 */
94 uint8_t **extended_data;
f0d77b20 95} AVFilterBuffer;
a5cbb2f4 96
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97#define AV_PERM_READ 0x01 ///< can read from the buffer
98#define AV_PERM_WRITE 0x02 ///< can write to the buffer
99#define AV_PERM_PRESERVE 0x04 ///< nobody else can overwrite the buffer
100#define AV_PERM_REUSE 0x08 ///< can output the buffer multiple times, with the same contents each time
101#define AV_PERM_REUSE2 0x10 ///< can output the buffer multiple times, modified each time
0ccabeea 102#define AV_PERM_NEG_LINESIZES 0x20 ///< the buffer requested can have negative linesizes
ff5f1be0 103
a5cbb2f4 104/**
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105 * Audio specific properties in a reference to an AVFilterBuffer. Since
106 * AVFilterBufferRef is common to different media formats, audio specific
107 * per reference properties must be separated out.
108 */
109typedef struct AVFilterBufferRefAudioProps {
cc276c85 110 uint64_t channel_layout; ///< channel layout of audio buffer
a242ac36 111 int nb_samples; ///< number of audio samples
a6bdfc2a 112 int sample_rate; ///< audio buffer sample rate
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113 int planar; ///< audio buffer - planar or packed
114} AVFilterBufferRefAudioProps;
115
116/**
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117 * Video specific properties in a reference to an AVFilterBuffer. Since
118 * AVFilterBufferRef is common to different media formats, video specific
119 * per reference properties must be separated out.
120 */
f607cc18 121typedef struct AVFilterBufferRefVideoProps {
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122 int w; ///< image width
123 int h; ///< image height
124 AVRational pixel_aspect; ///< pixel aspect ratio
125 int interlaced; ///< is frame interlaced
126 int top_field_first; ///< field order
bebe72f4 127 enum AVPictureType pict_type; ///< picture type of the frame
10d39405 128 int key_frame; ///< 1 -> keyframe, 0-> not
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129} AVFilterBufferRefVideoProps;
130
131/**
f0d77b20 132 * A reference to an AVFilterBuffer. Since filters can manipulate the origin of
7fce481a 133 * a buffer to, for example, crop image without any memcpy, the buffer origin
38efe768 134 * and dimensions are per-reference properties. Linesize is also useful for
bbf42679 135 * image flipping, frame to field filters, etc, and so is also per-reference.
a5cbb2f4 136 *
1a18860a 137 * TODO: add anything necessary for frame reordering
a5cbb2f4 138 */
f607cc18 139typedef struct AVFilterBufferRef {
7fce481a 140 AVFilterBuffer *buf; ///< the buffer that this is a reference to
ad2c9501 141 uint8_t *data[8]; ///< picture/audio data for each plane
c1db7bff 142 int linesize[8]; ///< number of bytes per line
d54e0948 143 int format; ///< media format
a5cbb2f4 144
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145 /**
146 * presentation timestamp. The time unit may change during
147 * filtering, as it is specified in the link and the filter code
148 * may need to rescale the PTS accordingly.
149 */
150 int64_t pts;
5bb5c1dc 151 int64_t pos; ///< byte position in stream, -1 if unknown
1a18860a 152
ff5f1be0 153 int perms; ///< permissions, see the AV_PERM_* flags
efdc74ef 154
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155 enum AVMediaType type; ///< media type of buffer data
156 AVFilterBufferRefVideoProps *video; ///< video buffer specific properties
ad2c9501 157 AVFilterBufferRefAudioProps *audio; ///< audio buffer specific properties
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158
159 /**
160 * pointers to the data planes/channels.
161 *
162 * For video, this should simply point to data[].
163 *
164 * For planar audio, each channel has a separate data pointer, and
165 * linesize[0] contains the size of each channel buffer.
166 * For packed audio, there is just one data pointer, and linesize[0]
167 * contains the total size of the buffer for all channels.
168 *
169 * Note: Both data and extended_data will always be set, but for planar
170 * audio with more channels that can fit in data, extended_data must be used
171 * in order to access all channels.
172 */
173 uint8_t **extended_data;
ecc8dada 174} AVFilterBufferRef;
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175
176/**
ad2c9501 177 * Copy properties of src to dst, without copying the actual data
4d508e4d 178 */
8134fafe 179void avfilter_copy_buffer_ref_props(AVFilterBufferRef *dst, AVFilterBufferRef *src);
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180
181/**
7fce481a 182 * Add a new reference to a buffer.
3fa3e4f4 183 *
7fce481a 184 * @param ref an existing reference to the buffer
664f6595 185 * @param pmask a bitmask containing the allowable permissions in the new
13ff8fd0 186 * reference
7fce481a 187 * @return a new reference to the buffer with the same properties as the
13ff8fd0 188 * old, excluding any permissions denied by pmask
a5cbb2f4 189 */
7fce481a 190AVFilterBufferRef *avfilter_ref_buffer(AVFilterBufferRef *ref, int pmask);
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191
192/**
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193 * Remove a reference to a buffer. If this is the last reference to the
194 * buffer, the buffer itself is also automatically freed.
3fa3e4f4 195 *
6baf4afa 196 * @param ref reference to the buffer, may be NULL
a5cbb2f4 197 */
7fce481a 198void avfilter_unref_buffer(AVFilterBufferRef *ref);
a5cbb2f4 199
13ff8fd0 200/**
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201 * A list of supported formats for one end of a filter link. This is used
202 * during the format negotiation process to try to pick the best format to
203 * use to minimize the number of necessary conversions. Each filter gives a
204 * list of the formats supported by each input and output pad. The list
205 * given for each pad need not be distinct - they may be references to the
206 * same list of formats, as is often the case when a filter supports multiple
42f72a3a 207 * formats, but will always output the same format as it is given in input.
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208 *
209 * In this way, a list of possible input formats and a list of possible
210 * output formats are associated with each link. When a set of formats is
211 * negotiated over a link, the input and output lists are merged to form a
212 * new list containing only the common elements of each list. In the case
213 * that there were no common elements, a format conversion is necessary.
214 * Otherwise, the lists are merged, and all other links which reference
215 * either of the format lists involved in the merge are also affected.
216 *
217 * For example, consider the filter chain:
218 * filter (a) --> (b) filter (b) --> (c) filter
219 *
220 * where the letters in parenthesis indicate a list of formats supported on
221 * the input or output of the link. Suppose the lists are as follows:
222 * (a) = {A, B}
223 * (b) = {A, B, C}
224 * (c) = {B, C}
225 *
226 * First, the first link's lists are merged, yielding:
227 * filter (a) --> (a) filter (a) --> (c) filter
228 *
229 * Notice that format list (b) now refers to the same list as filter list (a).
230 * Next, the lists for the second link are merged, yielding:
231 * filter (a) --> (a) filter (a) --> (a) filter
232 *
233 * where (a) = {B}.
234 *
235 * Unfortunately, when the format lists at the two ends of a link are merged,
236 * we must ensure that all links which reference either pre-merge format list
237 * get updated as well. Therefore, we have the format list structure store a
238 * pointer to each of the pointers to itself.
239 */
f607cc18 240typedef struct AVFilterFormats {
35f3fdf4 241 unsigned format_count; ///< number of formats
bdab614b 242 int *formats; ///< list of media formats
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243
244 unsigned refcount; ///< number of references to this list
f607cc18 245 struct AVFilterFormats ***refs; ///< references to this list
daed21a1 246} AVFilterFormats;
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247
248/**
49bd8e4b 249 * Create a list of supported formats. This is intended for use in
f6a1fa85 250 * AVFilter->query_formats().
3fa3e4f4 251 *
bdab614b 252 * @param fmts list of media formats, terminated by -1
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253 * @return the format list, with no existing references
254 */
bdab614b 255AVFilterFormats *avfilter_make_format_list(const int *fmts);
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256
257/**
bdab614b 258 * Add fmt to the list of media formats contained in *avff.
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259 * If *avff is NULL the function allocates the filter formats struct
260 * and puts its pointer in *avff.
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261 *
262 * @return a non negative value in case of success, or a negative
263 * value corresponding to an AVERROR code in case of error
264 */
bdab614b 265int avfilter_add_format(AVFilterFormats **avff, int fmt);
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266
267/**
2912e87a 268 * Return a list of all formats supported by Libav for the given media type.
35f3fdf4 269 */
bdab614b 270AVFilterFormats *avfilter_all_formats(enum AVMediaType type);
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271
272/**
49bd8e4b 273 * Return a format list which contains the intersection of the formats of
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274 * a and b. Also, all the references of a, all the references of b, and
275 * a and b themselves will be deallocated.
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276 *
277 * If a and b do not share any common formats, neither is modified, and NULL
278 * is returned.
279 */
280AVFilterFormats *avfilter_merge_formats(AVFilterFormats *a, AVFilterFormats *b);
281
09b63a42 282/**
49bd8e4b 283 * Add *ref as a new reference to formats.
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284 * That is the pointers will point like in the ascii art below:
285 * ________
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286 * |formats |<--------.
287 * | ____ | ____|___________________
288 * | |refs| | | __|_
289 * | |* * | | | | | | AVFilterLink
09b63a42 290 * | |* *--------->|*ref|
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291 * | |____| | | |____|
292 * |________| |________________________
09b63a42 293 */
a27c8d5f 294void avfilter_formats_ref(AVFilterFormats *formats, AVFilterFormats **ref);
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295
296/**
49bd8e4b 297 * If *ref is non-NULL, remove *ref as a reference to the format list
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298 * it currently points to, deallocates that list if this was the last
299 * reference, and sets *ref to NULL.
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300 *
301 * Before After
302 * ________ ________ NULL
303 * |formats |<--------. |formats | ^
304 * | ____ | ____|________________ | ____ | ____|________________
305 * | |refs| | | __|_ | |refs| | | __|_
306 * | |* * | | | | | | AVFilterLink | |* * | | | | | | AVFilterLink
307 * | |* *--------->|*ref| | |* | | | |*ref|
308 * | |____| | | |____| | |____| | | |____|
309 * |________| |_____________________ |________| |_____________________
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310 */
311void avfilter_formats_unref(AVFilterFormats **ref);
312
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313/**
314 *
315 * Before After
316 * ________ ________
a27c8d5f 317 * |formats |<---------. |formats |<---------.
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318 * | ____ | ___|___ | ____ | ___|___
319 * | |refs| | | | | | |refs| | | | | NULL
320 * | |* *--------->|*oldref| | |* *--------->|*newref| ^
321 * | |* * | | |_______| | |* * | | |_______| ___|___
322 * | |____| | | |____| | | | |
323 * |________| |________| |*oldref|
324 * |_______|
325 */
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326void avfilter_formats_changeref(AVFilterFormats **oldref,
327 AVFilterFormats **newref);
328
35f3fdf4 329/**
664f6595 330 * A filter pad used for either input or output.
13ff8fd0 331 */
f607cc18 332struct AVFilterPad {
a5cbb2f4 333 /**
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334 * Pad name. The name is unique among inputs and among outputs, but an
335 * input may have the same name as an output. This may be NULL if this
13ff8fd0 336 * pad has no need to ever be referenced by name.
a5cbb2f4 337 */
2844dd39 338 const char *name;
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339
340 /**
0ce4a627 341 * AVFilterPad type.
a5cbb2f4 342 */
72415b2a 343 enum AVMediaType type;
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344
345 /**
38efe768 346 * Minimum required permissions on incoming buffers. Any buffer with
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347 * insufficient permissions will be automatically copied by the filter
348 * system to a new buffer which provides the needed access permissions.
349 *
350 * Input pads only.
351 */
352 int min_perms;
353
354 /**
38efe768 355 * Permissions which are not accepted on incoming buffers. Any buffer
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356 * which has any of these permissions set will be automatically copied
357 * by the filter system to a new buffer which does not have those
38efe768 358 * permissions. This can be used to easily disallow buffers with
9ce95f27 359 * AV_PERM_REUSE.
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360 *
361 * Input pads only.
362 */
363 int rej_perms;
364
365 /**
38efe768 366 * Callback called before passing the first slice of a new frame. If
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367 * NULL, the filter layer will default to storing a reference to the
368 * picture inside the link structure.
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369 *
370 * Input video pads only.
a5cbb2f4 371 */
ecc8dada 372 void (*start_frame)(AVFilterLink *link, AVFilterBufferRef *picref);
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373
374 /**
ad2c9501 375 * Callback function to get a video buffer. If NULL, the filter system will
da23d424 376 * use avfilter_default_get_video_buffer().
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377 *
378 * Input video pads only.
a5cbb2f4 379 */
ecc8dada 380 AVFilterBufferRef *(*get_video_buffer)(AVFilterLink *link, int perms, int w, int h);
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381
382 /**
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383 * Callback function to get an audio buffer. If NULL, the filter system will
384 * use avfilter_default_get_audio_buffer().
385 *
386 * Input audio pads only.
387 */
388 AVFilterBufferRef *(*get_audio_buffer)(AVFilterLink *link, int perms,
7ef0adcc 389 int nb_samples);
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390
391 /**
38efe768 392 * Callback called after the slices of a frame are completely sent. If
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393 * NULL, the filter layer will default to releasing the reference stored
394 * in the link structure during start_frame().
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395 *
396 * Input video pads only.
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397 */
398 void (*end_frame)(AVFilterLink *link);
399
400 /**
38efe768 401 * Slice drawing callback. This is where a filter receives video data
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402 * and should do its processing.
403 *
404 * Input video pads only.
a5cbb2f4 405 */
a13a5437 406 void (*draw_slice)(AVFilterLink *link, int y, int height, int slice_dir);
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407
408 /**
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409 * Samples filtering callback. This is where a filter receives audio data
410 * and should do its processing.
411 *
412 * Input audio pads only.
413 */
414 void (*filter_samples)(AVFilterLink *link, AVFilterBufferRef *samplesref);
415
416 /**
38efe768 417 * Frame poll callback. This returns the number of immediately available
177477f5 418 * samples. It should return a positive value if the next request_frame()
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419 * is guaranteed to return one frame (with no delay).
420 *
421 * Defaults to just calling the source poll_frame() method.
422 *
ce353a88 423 * Output pads only.
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424 */
425 int (*poll_frame)(AVFilterLink *link);
426
427 /**
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428 * Frame request callback. A call to this should result in at least one
429 * frame being output over the given link. This should return zero on
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430 * success, and another value on error.
431 *
ce353a88 432 * Output pads only.
a5cbb2f4 433 */
63f64e6f 434 int (*request_frame)(AVFilterLink *link);
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435
436 /**
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437 * Link configuration callback.
438 *
439 * For output pads, this should set the link properties such as
38efe768 440 * width/height. This should NOT set the format property - that is
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441 * negotiated between filters by the filter system using the
442 * query_formats() callback before this function is called.
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443 *
444 * For input pads, this should check the properties of the link, and update
445 * the filter's internal state as necessary.
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446 *
447 * For both input and output filters, this should return zero on success,
448 * and another value on error.
a5cbb2f4 449 */
d3e57c15 450 int (*config_props)(AVFilterLink *link);
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451};
452
43c7a01e 453#if FF_API_FILTERS_PUBLIC
2b187df9 454/** default handler for start_frame() for video inputs */
43c7a01e 455attribute_deprecated
ecc8dada 456void avfilter_default_start_frame(AVFilterLink *link, AVFilterBufferRef *picref);
a4fb0ada 457
b9609848 458/** default handler for draw_slice() for video inputs */
43c7a01e 459attribute_deprecated
a13a5437 460void avfilter_default_draw_slice(AVFilterLink *link, int y, int h, int slice_dir);
a4fb0ada 461
2b187df9 462/** default handler for end_frame() for video inputs */
43c7a01e 463attribute_deprecated
a5cbb2f4 464void avfilter_default_end_frame(AVFilterLink *link);
a4fb0ada 465
88c3b87b 466#if FF_API_DEFAULT_CONFIG_OUTPUT_LINK
ad2c9501 467/** default handler for config_props() for audio/video outputs */
88c3b87b 468attribute_deprecated
901e6b39 469int avfilter_default_config_output_link(AVFilterLink *link);
88c3b87b 470#endif
a4fb0ada 471
2b187df9 472/** default handler for get_video_buffer() for video inputs */
43c7a01e 473attribute_deprecated
ecc8dada 474AVFilterBufferRef *avfilter_default_get_video_buffer(AVFilterLink *link,
a4fb0ada 475 int perms, int w, int h);
ad2c9501 476
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477/** Default handler for query_formats() */
478attribute_deprecated
479int avfilter_default_query_formats(AVFilterContext *ctx);
480#endif
481
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482/**
483 * A helper for query_formats() which sets all links to the same list of
484 * formats. If there are no links hooked to this filter, the list of formats is
485 * freed.
486 */
487void avfilter_set_common_formats(AVFilterContext *ctx, AVFilterFormats *formats);
a4fb0ada 488
c04c533f 489#if FF_API_FILTERS_PUBLIC
91d1c741 490/** start_frame() handler for filters which simply pass video along */
c04c533f 491attribute_deprecated
ecc8dada 492void avfilter_null_start_frame(AVFilterLink *link, AVFilterBufferRef *picref);
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493
494/** draw_slice() handler for filters which simply pass video along */
c04c533f 495attribute_deprecated
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496void avfilter_null_draw_slice(AVFilterLink *link, int y, int h, int slice_dir);
497
498/** end_frame() handler for filters which simply pass video along */
c04c533f 499attribute_deprecated
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500void avfilter_null_end_frame(AVFilterLink *link);
501
502/** get_video_buffer() handler for filters which simply pass video along */
c04c533f 503attribute_deprecated
ecc8dada 504AVFilterBufferRef *avfilter_null_get_video_buffer(AVFilterLink *link,
91d1c741 505 int perms, int w, int h);
c04c533f 506#endif
91d1c741 507
13ff8fd0 508/**
38efe768 509 * Filter definition. This defines the pads a filter contains, and all the
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510 * callback functions used to interact with the filter.
511 */
f607cc18 512typedef struct AVFilter {
2844dd39 513 const char *name; ///< filter name
a5cbb2f4 514
13ff8fd0 515 int priv_size; ///< size of private data to allocate for the filter
a5cbb2f4 516
4d96a914 517 /**
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518 * Filter initialization function. Args contains the user-supplied
519 * parameters. FIXME: maybe an AVOption-based system would be better?
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520 * opaque is data provided by the code requesting creation of the filter,
521 * and is used to pass data to the filter.
4d96a914 522 */
95bcf498 523 int (*init)(AVFilterContext *ctx, const char *args, void *opaque);
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524
525 /**
38efe768 526 * Filter uninitialization function. Should deallocate any memory held
7fce481a 527 * by the filter, release any buffer references, etc. This does not need
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528 * to deallocate the AVFilterContext->priv memory itself.
529 */
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530 void (*uninit)(AVFilterContext *ctx);
531
35f3fdf4 532 /**
c4d2e41c 533 * Queries formats supported by the filter and its pads, and sets the
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534 * in_formats for links connected to its output pads, and out_formats
535 * for links connected to its input pads.
536 *
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537 * @return zero on success, a negative value corresponding to an
538 * AVERROR code otherwise
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539 */
540 int (*query_formats)(AVFilterContext *);
541
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542 const AVFilterPad *inputs; ///< NULL terminated list of inputs. NULL if none
543 const AVFilterPad *outputs; ///< NULL terminated list of outputs. NULL if none
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544
545 /**
546 * A description for the filter. You should use the
547 * NULL_IF_CONFIG_SMALL() macro to define it.
548 */
549 const char *description;
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550} AVFilter;
551
13ff8fd0 552/** An instance of a filter */
f607cc18 553struct AVFilterContext {
d42a814e 554 const AVClass *av_class; ///< needed for av_log()
a5cbb2f4 555
664f6595 556 AVFilter *filter; ///< the AVFilter of which this is an instance
a5cbb2f4 557
13ff8fd0 558 char *name; ///< name of this filter instance
dcea2482 559
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560 unsigned input_count; ///< number of input pads
561 AVFilterPad *input_pads; ///< array of input pads
562 AVFilterLink **inputs; ///< array of pointers to input links
25f8e601 563
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564 unsigned output_count; ///< number of output pads
565 AVFilterPad *output_pads; ///< array of output pads
566 AVFilterLink **outputs; ///< array of pointers to output links
a5cbb2f4 567
13ff8fd0 568 void *priv; ///< private data for use by the filter
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569};
570
13ff8fd0 571/**
38efe768 572 * A link between two filters. This contains pointers to the source and
f4433de9 573 * destination filters between which this link exists, and the indexes of
38efe768 574 * the pads involved. In addition, this link also contains the parameters
13ff8fd0 575 * which have been negotiated and agreed upon between the filter, such as
2b187df9 576 * image dimensions, format, etc.
13ff8fd0 577 */
f607cc18 578struct AVFilterLink {
13ff8fd0 579 AVFilterContext *src; ///< source filter
acc0490f 580 AVFilterPad *srcpad; ///< output pad on the source filter
a5cbb2f4 581
13ff8fd0 582 AVFilterContext *dst; ///< dest filter
acc0490f 583 AVFilterPad *dstpad; ///< input pad on the dest filter
a5cbb2f4 584
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585 /** stage of the initialization of the link properties (dimensions, etc) */
586 enum {
587 AVLINK_UNINIT = 0, ///< not started
588 AVLINK_STARTINIT, ///< started, but incomplete
589 AVLINK_INIT ///< complete
590 } init_state;
591
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592 enum AVMediaType type; ///< filter media type
593
910b5b82 594 /* These parameters apply only to video */
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595 int w; ///< agreed upon image width
596 int h; ///< agreed upon image height
910b5b82 597 AVRational sample_aspect_ratio; ///< agreed upon sample aspect ratio
ad2c9501 598 /* These two parameters apply only to audio */
cc276c85 599 uint64_t channel_layout; ///< channel layout of current buffer (see libavutil/audioconvert.h)
f20ab492 600#if FF_API_SAMPLERATE64
ad2c9501 601 int64_t sample_rate; ///< samples per second
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602#else
603 int sample_rate; ///< samples per second
604#endif
ad2c9501 605
bdab614b 606 int format; ///< agreed upon media format
a5cbb2f4 607
60bf6ce3 608 /**
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609 * Lists of formats supported by the input and output filters respectively.
610 * These lists are used for negotiating the format to actually be used,
611 * which will be loaded into the format member, above, when chosen.
612 */
613 AVFilterFormats *in_formats;
614 AVFilterFormats *out_formats;
615
616 /**
7fce481a 617 * The buffer reference currently being sent across the link by the source
38efe768 618 * filter. This is used internally by the filter system to allow
7fce481a 619 * automatic copying of buffers which do not have sufficient permissions
38efe768 620 * for the destination. This should not be accessed directly by the
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621 * filters.
622 */
5d4890d7 623 AVFilterBufferRef *src_buf;
60bf6ce3 624
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625 AVFilterBufferRef *cur_buf;
626 AVFilterBufferRef *out_buf;
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627
628 /**
629 * Define the time base used by the PTS of the frames/samples
630 * which will pass through this link.
631 * During the configuration stage, each filter is supposed to
632 * change only the output timebase, while the timebase of the
633 * input link is assumed to be an unchangeable property.
634 */
635 AVRational time_base;
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636
637 /*****************************************************************
638 * All fields below this line are not part of the public API. They
639 * may not be used outside of libavfilter and can be changed and
640 * removed at will.
641 * New public fields should be added right above.
642 *****************************************************************
643 */
644 /**
645 * Lists of channel layouts and sample rates used for automatic
646 * negotiation.
647 */
648 AVFilterFormats *in_samplerates;
649 AVFilterFormats *out_samplerates;
650 struct AVFilterChannelLayouts *in_channel_layouts;
651 struct AVFilterChannelLayouts *out_channel_layouts;
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652};
653
13ff8fd0 654/**
49bd8e4b 655 * Link two filters together.
3fa3e4f4 656 *
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657 * @param src the source filter
658 * @param srcpad index of the output pad on the source filter
659 * @param dst the destination filter
660 * @param dstpad index of the input pad on the destination filter
661 * @return zero on success
13ff8fd0 662 */
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663int avfilter_link(AVFilterContext *src, unsigned srcpad,
664 AVFilterContext *dst, unsigned dstpad);
665
13ff8fd0 666/**
bdab614b 667 * Negotiate the media format, dimensions, etc of all inputs to a filter.
3fa3e4f4 668 *
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669 * @param filter the filter to negotiate the properties for its inputs
670 * @return zero on successful negotiation
13ff8fd0 671 */
24c4eff6 672int avfilter_config_links(AVFilterContext *filter);
85322466 673
13ff8fd0 674/**
49bd8e4b 675 * Request a picture buffer with a specific set of permissions.
3fa3e4f4 676 *
7fce481a 677 * @param link the output link to the filter from which the buffer will
13ff8fd0 678 * be requested
664f6595 679 * @param perms the required access permissions
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680 * @param w the minimum width of the buffer to allocate
681 * @param h the minimum height of the buffer to allocate
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682 * @return A reference to the buffer. This must be unreferenced with
683 * avfilter_unref_buffer when you are finished with it.
13ff8fd0 684 */
ecc8dada 685AVFilterBufferRef *avfilter_get_video_buffer(AVFilterLink *link, int perms,
0eb4ff9e 686 int w, int h);
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687
688/**
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689 * Create a buffer reference wrapped around an already allocated image
690 * buffer.
691 *
692 * @param data pointers to the planes of the image to reference
693 * @param linesize linesizes for the planes of the image to reference
694 * @param perms the required access permissions
695 * @param w the width of the image specified by the data and linesize arrays
696 * @param h the height of the image specified by the data and linesize arrays
697 * @param format the pixel format of the image specified by the data and linesize arrays
698 */
699AVFilterBufferRef *
700avfilter_get_video_buffer_ref_from_arrays(uint8_t *data[4], int linesize[4], int perms,
701 int w, int h, enum PixelFormat format);
702
703/**
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704 * Create an audio buffer reference wrapped around an already
705 * allocated samples buffer.
706 *
707 * @param data pointers to the samples plane buffers
708 * @param linesize linesize for the samples plane buffers
709 * @param perms the required access permissions
710 * @param nb_samples number of samples per channel
711 * @param sample_fmt the format of each sample in the buffer to allocate
712 * @param channel_layout the channel layout of the buffer
713 */
714AVFilterBufferRef *avfilter_get_audio_buffer_ref_from_arrays(uint8_t **data,
715 int linesize,
716 int perms,
717 int nb_samples,
718 enum AVSampleFormat sample_fmt,
719 uint64_t channel_layout);
720
721/**
49bd8e4b 722 * Request an input frame from the filter at the other end of the link.
3fa3e4f4 723 *
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724 * @param link the input link
725 * @return zero on success
13ff8fd0 726 */
0155b1a1 727int avfilter_request_frame(AVFilterLink *link);
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728
729/**
49bd8e4b 730 * Poll a frame from the filter chain.
3fa3e4f4 731 *
b04c740a 732 * @param link the input link
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733 * @return the number of immediately available frames, a negative
734 * number in case of error
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735 */
736int avfilter_poll_frame(AVFilterLink *link);
737
738/**
58c42af7 739 * Notify the next filter of the start of a frame.
3fa3e4f4 740 *
664f6595 741 * @param link the output link the frame will be sent over
38efe768 742 * @param picref A reference to the frame about to be sent. The data for this
13ff8fd0 743 * frame need only be valid once draw_slice() is called for that
38efe768 744 * portion. The receiving filter will free this reference when
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745 * it no longer needs it.
746 */
ecc8dada 747void avfilter_start_frame(AVFilterLink *link, AVFilterBufferRef *picref);
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748
749/**
49bd8e4b 750 * Notifie the next filter that the current frame has finished.
3fa3e4f4 751 *
664f6595 752 * @param link the output link the frame was sent over
13ff8fd0 753 */
a5cbb2f4 754void avfilter_end_frame(AVFilterLink *link);
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755
756/**
49bd8e4b 757 * Send a slice to the next filter.
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758 *
759 * Slices have to be provided in sequential order, either in
760 * top-bottom or bottom-top order. If slices are provided in
761 * non-sequential order the behavior of the function is undefined.
762 *
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763 * @param link the output link over which the frame is being sent
764 * @param y offset in pixels from the top of the image for this slice
765 * @param h height of this slice in pixels
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766 * @param slice_dir the assumed direction for sending slices,
767 * from the top slice to the bottom slice if the value is 1,
768 * from the bottom slice to the top slice if the value is -1,
769 * for other values the behavior of the function is undefined.
13ff8fd0 770 */
a13a5437 771void avfilter_draw_slice(AVFilterLink *link, int y, int h, int slice_dir);
a5cbb2f4 772
49bd8e4b 773/** Initialize the filter system. Register all builtin filters. */
11de6cac 774void avfilter_register_all(void);
e4152452 775
49bd8e4b 776/** Uninitialize the filter system. Unregister all filters. */
a5cbb2f4 777void avfilter_uninit(void);
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778
779/**
49bd8e4b 780 * Register a filter. This is only needed if you plan to use
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781 * avfilter_get_by_name later to lookup the AVFilter structure by name. A
782 * filter can still by instantiated with avfilter_open even if it is not
783 * registered.
3fa3e4f4 784 *
664f6595 785 * @param filter the filter to register
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786 * @return 0 if the registration was succesfull, a negative value
787 * otherwise
13ff8fd0 788 */
86a60fa1 789int avfilter_register(AVFilter *filter);
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790
791/**
49bd8e4b 792 * Get a filter definition matching the given name.
3fa3e4f4 793 *
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794 * @param name the filter name to find
795 * @return the filter definition, if any matching one is registered.
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796 * NULL if none found.
797 */
2844dd39 798AVFilter *avfilter_get_by_name(const char *name);
a5cbb2f4 799
13ff8fd0 800/**
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801 * If filter is NULL, returns a pointer to the first registered filter pointer,
802 * if filter is non-NULL, returns the next pointer after filter.
803 * If the returned pointer points to NULL, the last registered filter
804 * was already reached.
805 */
806AVFilter **av_filter_next(AVFilter **filter);
807
808/**
49bd8e4b 809 * Create a filter instance.
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810 *
811 * @param filter_ctx put here a pointer to the created filter context
812 * on success, NULL on failure
664f6595 813 * @param filter the filter to create an instance of
38efe768 814 * @param inst_name Name to give to the new instance. Can be NULL for none.
84c03869 815 * @return >= 0 in case of success, a negative error code otherwise
13ff8fd0 816 */
84c03869 817int avfilter_open(AVFilterContext **filter_ctx, AVFilter *filter, const char *inst_name);
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818
819/**
49bd8e4b 820 * Initialize a filter.
3fa3e4f4 821 *
664f6595 822 * @param filter the filter to initialize
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823 * @param args A string of parameters to use when initializing the filter.
824 * The format and meaning of this string varies by filter.
38efe768 825 * @param opaque Any extra non-string data needed by the filter. The meaning
13ff8fd0 826 * of this parameter varies by filter.
664f6595 827 * @return zero on success
13ff8fd0 828 */
6e365c57 829int avfilter_init_filter(AVFilterContext *filter, const char *args, void *opaque);
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830
831/**
24de0edb 832 * Free a filter context.
3fa3e4f4 833 *
24de0edb 834 * @param filter the filter to free
13ff8fd0 835 */
24de0edb 836void avfilter_free(AVFilterContext *filter);
a5cbb2f4 837
13ff8fd0 838/**
49bd8e4b 839 * Insert a filter in the middle of an existing link.
3fa3e4f4 840 *
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841 * @param link the link into which the filter should be inserted
842 * @param filt the filter to be inserted
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843 * @param filt_srcpad_idx the input pad on the filter to connect
844 * @param filt_dstpad_idx the output pad on the filter to connect
664f6595 845 * @return zero on success
13ff8fd0 846 */
35f3fdf4 847int avfilter_insert_filter(AVFilterLink *link, AVFilterContext *filt,
486adc55 848 unsigned filt_srcpad_idx, unsigned filt_dstpad_idx);
d3e57c15 849
a9c81431 850/**
49bd8e4b 851 * Insert a new pad.
3fa3e4f4 852 *
38efe768 853 * @param idx Insertion point. Pad is inserted at the end if this point
a9c81431
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854 * is beyond the end of the list of pads.
855 * @param count Pointer to the number of pads in the list
856 * @param padidx_off Offset within an AVFilterLink structure to the element
857 * to increment when inserting a new pad causes link
858 * numbering to change
859 * @param pads Pointer to the pointer to the beginning of the list of pads
860 * @param links Pointer to the pointer to the beginning of the list of links
861 * @param newpad The new pad to add. A copy is made when adding.
862 */
863void avfilter_insert_pad(unsigned idx, unsigned *count, size_t padidx_off,
864 AVFilterPad **pads, AVFilterLink ***links,
865 AVFilterPad *newpad);
866
49bd8e4b 867/** Insert a new input pad for the filter. */
a9c81431
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868static inline void avfilter_insert_inpad(AVFilterContext *f, unsigned index,
869 AVFilterPad *p)
870{
871 avfilter_insert_pad(index, &f->input_count, offsetof(AVFilterLink, dstpad),
872 &f->input_pads, &f->inputs, p);
873}
874
49bd8e4b 875/** Insert a new output pad for the filter. */
a9c81431
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876static inline void avfilter_insert_outpad(AVFilterContext *f, unsigned index,
877 AVFilterPad *p)
878{
879 avfilter_insert_pad(index, &f->output_count, offsetof(AVFilterLink, srcpad),
880 &f->output_pads, &f->outputs, p);
881}
882
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883/**
884 * Copy the frame properties of src to dst, without copying the actual
885 * image data.
886 *
887 * @return 0 on success, a negative number on error.
888 */
889int avfilter_copy_frame_props(AVFilterBufferRef *dst, const AVFrame *src);
890
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891/**
892 * Copy the frame properties and data pointers of src to dst, without copying
893 * the actual data.
894 *
895 * @return 0 on success, a negative number on error.
896 */
897int avfilter_copy_buf_props(AVFrame *dst, const AVFilterBufferRef *src);
898
153382e1 899#endif /* AVFILTER_AVFILTER_H */