2 * This file is part of FFmpeg.
4 * FFmpeg is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Lesser General Public
6 * License as published by the Free Software Foundation; either
7 * version 2.1 of the License, or (at your option) any later version.
9 * FFmpeg is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Lesser General Public License for more details.
14 * You should have received a copy of the GNU Lesser General Public
15 * License along with FFmpeg; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19 #ifndef AVFILTER_INTERNAL_H
20 #define AVFILTER_INTERNAL_H
24 * internal API functions
27 #include "libavutil/internal.h"
29 #include "avfiltergraph.h"
36 typedef struct AVFilterPool
{
37 AVFilterBufferRef
*pic
[POOL_SIZE
];
43 typedef struct AVFilterCommand
{
44 double time
; ///< time expressed in seconds
45 char *command
; ///< command
46 char *arg
; ///< optional argument for the command
48 struct AVFilterCommand
*next
;
52 * Update the position of a link in the age heap.
54 void ff_avfilter_graph_update_heap(AVFilterGraph
*graph
, AVFilterLink
*link
);
56 #if !FF_API_AVFILTERPAD_PUBLIC
58 * A filter pad used for either input or output.
62 * Pad name. The name is unique among inputs and among outputs, but an
63 * input may have the same name as an output. This may be NULL if this
64 * pad has no need to ever be referenced by name.
71 enum AVMediaType type
;
74 * Callback function to get a video buffer. If NULL, the filter system will
75 * use ff_default_get_video_buffer().
77 * Input video pads only.
79 AVFrame
*(*get_video_buffer
)(AVFilterLink
*link
, int w
, int h
);
82 * Callback function to get an audio buffer. If NULL, the filter system will
83 * use ff_default_get_audio_buffer().
85 * Input audio pads only.
87 AVFrame
*(*get_audio_buffer
)(AVFilterLink
*link
, int nb_samples
);
90 * Filtering callback. This is where a filter receives a frame with
91 * audio/video data and should do its processing.
95 * @return >= 0 on success, a negative AVERROR on error. This function
96 * must ensure that samplesref is properly unreferenced on error if it
97 * hasn't been passed on to another filter.
99 int (*filter_frame
)(AVFilterLink
*link
, AVFrame
*frame
);
102 * Frame poll callback. This returns the number of immediately available
103 * samples. It should return a positive value if the next request_frame()
104 * is guaranteed to return one frame (with no delay).
106 * Defaults to just calling the source poll_frame() method.
110 int (*poll_frame
)(AVFilterLink
*link
);
113 * Frame request callback. A call to this should result in at least one
114 * frame being output over the given link. This should return zero on
115 * success, and another value on error.
119 int (*request_frame
)(AVFilterLink
*link
);
122 * Link configuration callback.
124 * For output pads, this should set the link properties such as
125 * width/height. This should NOT set the format property - that is
126 * negotiated between filters by the filter system using the
127 * query_formats() callback before this function is called.
129 * For input pads, this should check the properties of the link, and update
130 * the filter's internal state as necessary.
132 * For both input and output filters, this should return zero on success,
133 * and another value on error.
135 int (*config_props
)(AVFilterLink
*link
);
138 * The filter expects a fifo to be inserted on its input link,
139 * typically because it has a delay.
146 * The filter expects writable frames from its input link,
147 * duplicating data buffers if needed.
155 struct AVFilterGraphInternal
{
157 avfilter_execute_func
*thread_execute
;
160 struct AVFilterInternal
{
161 avfilter_execute_func
*execute
;
164 #if FF_API_AVFILTERBUFFER
165 /** default handler for freeing audio/video buffer when there are no references left */
166 void ff_avfilter_default_free_buffer(AVFilterBuffer
*buf
);
169 /** Tell is a format is contained in the provided list terminated by -1. */
170 int ff_fmt_is_in(int fmt
, const int *fmts
);
172 /* Functions to parse audio format arguments */
175 * Parse a pixel format.
177 * @param ret pixel format pointer to where the value should be written
178 * @param arg string to parse
179 * @param log_ctx log context
180 * @return >= 0 in case of success, a negative AVERROR code on error
182 int ff_parse_pixel_format(enum AVPixelFormat
*ret
, const char *arg
, void *log_ctx
);
185 * Parse a sample rate.
187 * @param ret unsigned integer pointer to where the value should be written
188 * @param arg string to parse
189 * @param log_ctx log context
190 * @return >= 0 in case of success, a negative AVERROR code on error
192 int ff_parse_sample_rate(int *ret
, const char *arg
, void *log_ctx
);
197 * @param ret unsigned AVRational pointer to where the value should be written
198 * @param arg string to parse
199 * @param log_ctx log context
200 * @return >= 0 in case of success, a negative AVERROR code on error
202 int ff_parse_time_base(AVRational
*ret
, const char *arg
, void *log_ctx
);
205 * Parse a sample format name or a corresponding integer representation.
207 * @param ret integer pointer to where the value should be written
208 * @param arg string to parse
209 * @param log_ctx log context
210 * @return >= 0 in case of success, a negative AVERROR code on error
212 int ff_parse_sample_format(int *ret
, const char *arg
, void *log_ctx
);
215 * Parse a channel layout or a corresponding integer representation.
217 * @param ret 64bit integer pointer to where the value should be written.
218 * @param nret integer pointer to the number of channels;
219 * if not NULL, then unknown channel layouts are accepted
220 * @param arg string to parse
221 * @param log_ctx log context
222 * @return >= 0 in case of success, a negative AVERROR code on error
224 int ff_parse_channel_layout(int64_t *ret
, int *nret
, const char *arg
,
227 void ff_update_link_current_pts(AVFilterLink
*link
, int64_t pts
);
229 void ff_command_queue_pop(AVFilterContext
*filter
);
231 /* misc trace functions */
233 /* #define FF_AVFILTER_TRACE */
235 #ifdef FF_AVFILTER_TRACE
236 # define ff_tlog(pctx, ...) av_log(pctx, AV_LOG_DEBUG, __VA_ARGS__)
238 # define ff_tlog(pctx, ...) do { if (0) av_log(pctx, AV_LOG_DEBUG, __VA_ARGS__); } while (0)
241 #define FF_TPRINTF_START(ctx, func) ff_tlog(NULL, "%-16s: ", #func)
243 char *ff_get_ref_perms_string(char *buf
, size_t buf_size
, int perms
);
245 void ff_tlog_ref(void *ctx
, AVFrame
*ref
, int end
);
247 void ff_tlog_link(void *ctx
, AVFilterLink
*link
, int end
);
252 * @param idx Insertion point. Pad is inserted at the end if this point
253 * is beyond the end of the list of pads.
254 * @param count Pointer to the number of pads in the list
255 * @param padidx_off Offset within an AVFilterLink structure to the element
256 * to increment when inserting a new pad causes link
257 * numbering to change
258 * @param pads Pointer to the pointer to the beginning of the list of pads
259 * @param links Pointer to the pointer to the beginning of the list of links
260 * @param newpad The new pad to add. A copy is made when adding.
261 * @return >= 0 in case of success, a negative AVERROR code on error
263 int ff_insert_pad(unsigned idx
, unsigned *count
, size_t padidx_off
,
264 AVFilterPad
**pads
, AVFilterLink
***links
,
265 AVFilterPad
*newpad
);
267 /** Insert a new input pad for the filter. */
268 static inline int ff_insert_inpad(AVFilterContext
*f
, unsigned index
,
271 int ret
= ff_insert_pad(index
, &f
->nb_inputs
, offsetof(AVFilterLink
, dstpad
),
272 &f
->input_pads
, &f
->inputs
, p
);
274 FF_DISABLE_DEPRECATION_WARNINGS
275 f
->input_count
= f
->nb_inputs
;
276 FF_ENABLE_DEPRECATION_WARNINGS
281 /** Insert a new output pad for the filter. */
282 static inline int ff_insert_outpad(AVFilterContext
*f
, unsigned index
,
285 int ret
= ff_insert_pad(index
, &f
->nb_outputs
, offsetof(AVFilterLink
, srcpad
),
286 &f
->output_pads
, &f
->outputs
, p
);
288 FF_DISABLE_DEPRECATION_WARNINGS
289 f
->output_count
= f
->nb_outputs
;
290 FF_ENABLE_DEPRECATION_WARNINGS
296 * Poll a frame from the filter chain.
298 * @param link the input link
299 * @return the number of immediately available frames, a negative
300 * number in case of error
302 int ff_poll_frame(AVFilterLink
*link
);
305 * Request an input frame from the filter at the other end of the link.
307 * @param link the input link
308 * @return zero on success
310 int ff_request_frame(AVFilterLink
*link
);
312 #define AVFILTER_DEFINE_CLASS(fname) \
313 static const AVClass fname##_class = { \
314 .class_name = #fname, \
315 .item_name = av_default_item_name, \
316 .option = fname##_options, \
317 .version = LIBAVUTIL_VERSION_INT, \
318 .category = AV_CLASS_CATEGORY_FILTER, \
321 AVFilterBufferRef
*ff_copy_buffer_ref(AVFilterLink
*outlink
,
322 AVFilterBufferRef
*ref
);
325 * Find the index of a link.
327 * I.e. find i such that link == ctx->(in|out)puts[i]
329 #define FF_INLINK_IDX(link) ((int)((link)->dstpad - (link)->dst->input_pads))
330 #define FF_OUTLINK_IDX(link) ((int)((link)->srcpad - (link)->src->output_pads))
332 int ff_buffersink_read_compat(AVFilterContext
*ctx
, AVFilterBufferRef
**buf
);
333 int ff_buffersink_read_samples_compat(AVFilterContext
*ctx
, AVFilterBufferRef
**pbuf
,
336 * Send a frame of data to the next filter.
338 * @param link the output link over which the data is being sent
339 * @param frame a reference to the buffer of data being sent. The
340 * receiving filter will free this reference when it no longer
341 * needs it or pass it on to the next filter.
343 * @return >= 0 on success, a negative AVERROR on error. The receiving filter
344 * is responsible for unreferencing frame in case of error.
346 int ff_filter_frame(AVFilterLink
*link
, AVFrame
*frame
);
349 * Flags for AVFilterLink.flags.
354 * Frame requests may need to loop in order to be fulfilled.
355 * A filter must set this flags on an output link if it may return 0 in
356 * request_frame() without filtering a frame.
358 FF_LINK_FLAG_REQUEST_LOOP
= 1,
363 * Allocate a new filter context and return it.
365 * @param filter what filter to create an instance of
366 * @param inst_name name to give to the new filter context
368 * @return newly created filter context or NULL on failure
370 AVFilterContext
*ff_filter_alloc(const AVFilter
*filter
, const char *inst_name
);
373 * Remove a filter from a graph;
375 void ff_filter_graph_remove_filter(AVFilterGraph
*graph
, AVFilterContext
*filter
);
377 #endif /* AVFILTER_INTERNAL_H */