aboutsummaryrefslogtreecommitdiffstats
path: root/libavfilter/internal.h
blob: 9a95da10f1fa069542232e8b1906f537aa5352cb (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
/*
 * This file is part of FFmpeg.
 *
 * FFmpeg is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * FFmpeg is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with FFmpeg; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

#ifndef AVFILTER_INTERNAL_H
#define AVFILTER_INTERNAL_H

/**
 * @file
 * internal API functions
 */

#include "avfilter.h"
#include "avfiltergraph.h"
#include "formats.h"
#include "video.h"

#define POOL_SIZE 32
typedef struct AVFilterPool {
    AVFilterBufferRef *pic[POOL_SIZE];
    int count;
    int refcount;
    int draining;
} AVFilterPool;

typedef struct AVFilterCommand {
    double time;                ///< time expressed in seconds
    char *command;              ///< command
    char *arg;                  ///< optional argument for the command
    int flags;
    struct AVFilterCommand *next;
} AVFilterCommand;

/**
 * Update the position of a link in the age heap.
 */
void ff_avfilter_graph_update_heap(AVFilterGraph *graph, AVFilterLink *link);

#if !FF_API_AVFILTERPAD_PUBLIC
/**
 * A filter pad used for either input or output.
 */
struct AVFilterPad {
    /**
     * Pad name. The name is unique among inputs and among outputs, but an
     * input may have the same name as an output. This may be NULL if this
     * pad has no need to ever be referenced by name.
     */
    const char *name;

    /**
     * AVFilterPad type.
     */
    enum AVMediaType type;

    /**
     * Minimum required permissions on incoming buffers. Any buffer with
     * insufficient permissions will be automatically copied by the filter
     * system to a new buffer which provides the needed access permissions.
     *
     * Input pads only.
     */
    int min_perms;

    /**
     * Permissions which are not accepted on incoming buffers. Any buffer
     * which has any of these permissions set will be automatically copied
     * by the filter system to a new buffer which does not have those
     * permissions. This can be used to easily disallow buffers with
     * AV_PERM_REUSE.
     *
     * Input pads only.
     */
    int rej_perms;

    /**
     * Callback called before passing the first slice of a new frame. If
     * NULL, the filter layer will default to storing a reference to the
     * picture inside the link structure.
     *
     * Input video pads only.
     */
    void (*start_frame)(AVFilterLink *link, AVFilterBufferRef *picref);

    /**
     * Callback function to get a video buffer. If NULL, the filter system will
     * use avfilter_default_get_video_buffer().
     *
     * Input video pads only.
     */
    AVFilterBufferRef *(*get_video_buffer)(AVFilterLink *link, int perms, int w, int h);

    /**
     * Callback function to get an audio buffer. If NULL, the filter system will
     * use avfilter_default_get_audio_buffer().
     *
     * Input audio pads only.
     */
    AVFilterBufferRef *(*get_audio_buffer)(AVFilterLink *link, int perms,
                                           int nb_samples);

    /**
     * Callback called after the slices of a frame are completely sent. If
     * NULL, the filter layer will default to releasing the reference stored
     * in the link structure during start_frame().
     *
     * Input video pads only.
     */
    void (*end_frame)(AVFilterLink *link);

    /**
     * Slice drawing callback. This is where a filter receives video data
     * and should do its processing.
     *
     * Input video pads only.
     */
    void (*draw_slice)(AVFilterLink *link, int y, int height, int slice_dir);

    /**
     * Samples filtering callback. This is where a filter receives audio data
     * and should do its processing.
     *
     * Input audio pads only.
     */
    void (*filter_samples)(AVFilterLink *link, AVFilterBufferRef *samplesref);

    /**
     * Frame poll callback. This returns the number of immediately available
     * samples. It should return a positive value if the next request_frame()
     * is guaranteed to return one frame (with no delay).
     *
     * Defaults to just calling the source poll_frame() method.
     *
     * Output pads only.
     */
    int (*poll_frame)(AVFilterLink *link);

    /**
     * Frame request callback. A call to this should result in at least one
     * frame being output over the given link. This should return zero on
     * success, and another value on error.
     *
     * Output pads only.
     */
    int (*request_frame)(AVFilterLink *link);

    /**
     * Link configuration callback.
     *
     * For output pads, this should set the link properties such as
     * width/height. This should NOT set the format property - that is
     * negotiated between filters by the filter system using the
     * query_formats() callback before this function is called.
     *
     * For input pads, this should check the properties of the link, and update
     * the filter's internal state as necessary.
     *
     * For both input and output filters, this should return zero on success,
     * and another value on error.
     */
    int (*config_props)(AVFilterLink *link);
};
#endif

/** default handler for freeing audio/video buffer when there are no references left */
void ff_avfilter_default_free_buffer(AVFilterBuffer *buf);

/** Tell is a format is contained in the provided list terminated by -1. */
int ff_fmt_is_in(int fmt, const int *fmts);

/**
 * Return a copy of a list of integers terminated by -1, or NULL in
 * case of copy failure.
 */
int *ff_copy_int_list(const int * const list);

/**
 * Return a copy of a list of 64-bit integers, or NULL in case of
 * copy failure.
 */
int64_t *ff_copy_int64_list(const int64_t * const list);

/* Functions to parse audio format arguments */

/**
 * Parse a pixel format.
 *
 * @param ret pixel format pointer to where the value should be written
 * @param arg string to parse
 * @param log_ctx log context
 * @return 0 in case of success, a negative AVERROR code on error
 */
int ff_parse_pixel_format(enum PixelFormat *ret, const char *arg, void *log_ctx);

/**
 * Parse a sample rate.
 *
 * @param ret unsigned integer pointer to where the value should be written
 * @param arg string to parse
 * @param log_ctx log context
 * @return 0 in case of success, a negative AVERROR code on error
 */
int ff_parse_sample_rate(int *ret, const char *arg, void *log_ctx);

/**
 * Parse a time base.
 *
 * @param ret unsigned AVRational pointer to where the value should be written
 * @param arg string to parse
 * @param log_ctx log context
 * @return 0 in case of success, a negative AVERROR code on error
 */
int ff_parse_time_base(AVRational *ret, const char *arg, void *log_ctx);

/**
 * Parse a sample format name or a corresponding integer representation.
 *
 * @param ret integer pointer to where the value should be written
 * @param arg string to parse
 * @param log_ctx log context
 * @return 0 in case of success, a negative AVERROR code on error
 */
int ff_parse_sample_format(int *ret, const char *arg, void *log_ctx);

/**
 * Parse a channel layout or a corresponding integer representation.
 *
 * @param ret 64bit integer pointer to where the value should be written.
 * @param arg string to parse
 * @param log_ctx log context
 * @return 0 in case of success, a negative AVERROR code on error
 */
int ff_parse_channel_layout(int64_t *ret, const char *arg, void *log_ctx);

void ff_update_link_current_pts(AVFilterLink *link, int64_t pts);

void ff_free_pool(AVFilterPool *pool);

void ff_command_queue_pop(AVFilterContext *filter);

/* misc trace functions */

/* #define FF_AVFILTER_TRACE */

#ifdef FF_AVFILTER_TRACE
#    define ff_tlog(pctx, ...) av_log(pctx, AV_LOG_DEBUG, __VA_ARGS__)
#else
#    define ff_tlog(pctx, ...) do { if (0) av_log(pctx, AV_LOG_DEBUG, __VA_ARGS__); } while (0)
#endif

#define FF_TPRINTF_START(ctx, func) ff_tlog(NULL, "%-16s: ", #func)

char *ff_get_ref_perms_string(char *buf, size_t buf_size, int perms);

void ff_tlog_ref(void *ctx, AVFilterBufferRef *ref, int end);

void ff_tlog_link(void *ctx, AVFilterLink *link, int end);

/**
 * Insert a new pad.
 *
 * @param idx Insertion point. Pad is inserted at the end if this point
 *            is beyond the end of the list of pads.
 * @param count Pointer to the number of pads in the list
 * @param padidx_off Offset within an AVFilterLink structure to the element
 *                   to increment when inserting a new pad causes link
 *                   numbering to change
 * @param pads Pointer to the pointer to the beginning of the list of pads
 * @param links Pointer to the pointer to the beginning of the list of links
 * @param newpad The new pad to add. A copy is made when adding.
 */
void ff_insert_pad(unsigned idx, unsigned *count, size_t padidx_off,
                   AVFilterPad **pads, AVFilterLink ***links,
                   AVFilterPad *newpad);

/** Insert a new input pad for the filter. */
static inline void ff_insert_inpad(AVFilterContext *f, unsigned index,
                                   AVFilterPad *p)
{
    ff_insert_pad(index, &f->nb_inputs, offsetof(AVFilterLink, dstpad),
                  &f->input_pads, &f->inputs, p);
#if FF_API_FOO_COUNT
    f->input_count = f->nb_inputs;
#endif
}

/** Insert a new output pad for the filter. */
static inline void ff_insert_outpad(AVFilterContext *f, unsigned index,
                                    AVFilterPad *p)
{
    ff_insert_pad(index, &f->nb_outputs, offsetof(AVFilterLink, srcpad),
                  &f->output_pads, &f->outputs, p);
#if FF_API_FOO_COUNT
    f->output_count = f->nb_outputs;
#endif
}

/**
 * Poll a frame from the filter chain.
 *
 * @param  link the input link
 * @return the number of immediately available frames, a negative
 * number in case of error
 */
int ff_poll_frame(AVFilterLink *link);

/**
 * Request an input frame from the filter at the other end of the link.
 *
 * @param link the input link
 * @return     zero on success
 */
int ff_request_frame(AVFilterLink *link);

#define AVFILTER_DEFINE_CLASS(fname)            \
    static const AVClass fname##_class = {      \
        .class_name = #fname,                   \
        .item_name  = av_default_item_name,     \
        .option     = fname##_options,          \
        .version    = LIBAVUTIL_VERSION_INT,    \
        .category   = AV_CLASS_CATEGORY_FILTER, \
    }

#endif /* AVFILTER_INTERNAL_H */