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
28 #include "avfiltergraph.h"
33 typedef struct AVFilterPool {
34 AVFilterBufferRef *pic[POOL_SIZE];
40 typedef struct AVFilterCommand {
41 double time; ///< time expressed in seconds
42 char *command; ///< command
43 char *arg; ///< optional argument for the command
45 struct AVFilterCommand *next;
49 * Update the position of a link in the age heap.
51 void ff_avfilter_graph_update_heap(AVFilterGraph *graph, AVFilterLink *link);
53 /** default handler for freeing audio/video buffer when there are no references left */
54 void ff_avfilter_default_free_buffer(AVFilterBuffer *buf);
56 /** Tell is a format is contained in the provided list terminated by -1. */
57 int ff_fmt_is_in(int fmt, const int *fmts);
60 * Return a copy of a list of integers terminated by -1, or NULL in
61 * case of copy failure.
63 int *ff_copy_int_list(const int * const list);
66 * Return a copy of a list of 64-bit integers, or NULL in case of
69 int64_t *ff_copy_int64_list(const int64_t * const list);
71 /* Functions to parse audio format arguments */
74 * Parse a pixel format.
76 * @param ret pixel format pointer to where the value should be written
77 * @param arg string to parse
78 * @param log_ctx log context
79 * @return 0 in case of success, a negative AVERROR code on error
81 int ff_parse_pixel_format(enum PixelFormat *ret, const char *arg, void *log_ctx);
84 * Parse a sample rate.
86 * @param ret unsigned integer pointer to where the value should be written
87 * @param arg string to parse
88 * @param log_ctx log context
89 * @return 0 in case of success, a negative AVERROR code on error
91 int ff_parse_sample_rate(int *ret, const char *arg, void *log_ctx);
96 * @param ret unsigned AVRational pointer to where the value should be written
97 * @param arg string to parse
98 * @param log_ctx log context
99 * @return 0 in case of success, a negative AVERROR code on error
101 int ff_parse_time_base(AVRational *ret, const char *arg, void *log_ctx);
104 * Parse a sample format name or a corresponding integer representation.
106 * @param ret integer pointer to where the value should be written
107 * @param arg string to parse
108 * @param log_ctx log context
109 * @return 0 in case of success, a negative AVERROR code on error
111 int ff_parse_sample_format(int *ret, const char *arg, void *log_ctx);
114 * Parse a channel layout or a corresponding integer representation.
116 * @param ret 64bit integer pointer to where the value should be written.
117 * @param arg string to parse
118 * @param log_ctx log context
119 * @return 0 in case of success, a negative AVERROR code on error
121 int ff_parse_channel_layout(int64_t *ret, const char *arg, void *log_ctx);
123 void ff_update_link_current_pts(AVFilterLink *link, int64_t pts);
125 void ff_free_pool(AVFilterPool *pool);
127 void ff_command_queue_pop(AVFilterContext *filter);
129 /* misc debug functions */
131 #define FF_DPRINTF_START(ctx, func) av_dlog(NULL, "%-16s: ", #func)
133 char *ff_get_ref_perms_string(char *buf, size_t buf_size, int perms);
135 void ff_dlog_ref(void *ctx, AVFilterBufferRef *ref, int end);
137 void ff_dlog_link(void *ctx, AVFilterLink *link, int end);
142 * @param idx Insertion point. Pad is inserted at the end if this point
143 * is beyond the end of the list of pads.
144 * @param count Pointer to the number of pads in the list
145 * @param padidx_off Offset within an AVFilterLink structure to the element
146 * to increment when inserting a new pad causes link
147 * numbering to change
148 * @param pads Pointer to the pointer to the beginning of the list of pads
149 * @param links Pointer to the pointer to the beginning of the list of links
150 * @param newpad The new pad to add. A copy is made when adding.
152 void ff_insert_pad(unsigned idx, unsigned *count, size_t padidx_off,
153 AVFilterPad **pads, AVFilterLink ***links,
154 AVFilterPad *newpad);
156 /** Insert a new input pad for the filter. */
157 static inline void ff_insert_inpad(AVFilterContext *f, unsigned index,
160 ff_insert_pad(index, &f->input_count, offsetof(AVFilterLink, dstpad),
161 &f->input_pads, &f->inputs, p);
164 /** Insert a new output pad for the filter. */
165 static inline void ff_insert_outpad(AVFilterContext *f, unsigned index,
168 ff_insert_pad(index, &f->output_count, offsetof(AVFilterLink, srcpad),
169 &f->output_pads, &f->outputs, p);
173 * Poll a frame from the filter chain.
175 * @param link the input link
176 * @return the number of immediately available frames, a negative
177 * number in case of error
179 int ff_poll_frame(AVFilterLink *link);
182 * Request an input frame from the filter at the other end of the link.
184 * @param link the input link
185 * @return zero on success
187 int ff_request_frame(AVFilterLink *link);
189 #endif /* AVFILTER_INTERNAL_H */