3 * Copyright (c) 2007 Bobby Bingham
5 * This file is part of Libav.
7 * Libav 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.
12 * Libav 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.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with Libav; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
24 #include "libavutil/common.h"
25 #include "libavutil/pixdesc.h"
26 #include "libavutil/rational.h"
27 #include "libavutil/audioconvert.h"
33 unsigned avfilter_version(void) {
34 return LIBAVFILTER_VERSION_INT;
37 const char *avfilter_configuration(void)
39 return LIBAV_CONFIGURATION;
42 const char *avfilter_license(void)
44 #define LICENSE_PREFIX "libavfilter license: "
45 return LICENSE_PREFIX LIBAV_LICENSE + sizeof(LICENSE_PREFIX) - 1;
48 void ff_insert_pad(unsigned idx, unsigned *count, size_t padidx_off,
49 AVFilterPad **pads, AVFilterLink ***links,
54 idx = FFMIN(idx, *count);
56 *pads = av_realloc(*pads, sizeof(AVFilterPad) * (*count + 1));
57 *links = av_realloc(*links, sizeof(AVFilterLink*) * (*count + 1));
58 memmove(*pads +idx+1, *pads +idx, sizeof(AVFilterPad) * (*count-idx));
59 memmove(*links+idx+1, *links+idx, sizeof(AVFilterLink*) * (*count-idx));
60 memcpy(*pads+idx, newpad, sizeof(AVFilterPad));
64 for (i = idx+1; i < *count; i++)
66 (*(unsigned *)((uint8_t *) *links[i] + padidx_off))++;
69 int avfilter_link(AVFilterContext *src, unsigned srcpad,
70 AVFilterContext *dst, unsigned dstpad)
74 if (src->nb_outputs <= srcpad || dst->nb_inputs <= dstpad ||
75 src->outputs[srcpad] || dst->inputs[dstpad])
78 if (src->output_pads[srcpad].type != dst->input_pads[dstpad].type) {
79 av_log(src, AV_LOG_ERROR,
80 "Media type mismatch between the '%s' filter output pad %d and the '%s' filter input pad %d\n",
81 src->name, srcpad, dst->name, dstpad);
82 return AVERROR(EINVAL);
85 src->outputs[srcpad] =
86 dst-> inputs[dstpad] = link = av_mallocz(sizeof(AVFilterLink));
90 link->srcpad = &src->output_pads[srcpad];
91 link->dstpad = &dst->input_pads[dstpad];
92 link->type = src->output_pads[srcpad].type;
93 assert(PIX_FMT_NONE == -1 && AV_SAMPLE_FMT_NONE == -1);
99 int avfilter_insert_filter(AVFilterLink *link, AVFilterContext *filt,
100 unsigned filt_srcpad_idx, unsigned filt_dstpad_idx)
103 unsigned dstpad_idx = link->dstpad - link->dst->input_pads;
105 av_log(link->dst, AV_LOG_VERBOSE, "auto-inserting filter '%s' "
106 "between the filter '%s' and the filter '%s'\n",
107 filt->name, link->src->name, link->dst->name);
109 link->dst->inputs[dstpad_idx] = NULL;
110 if ((ret = avfilter_link(filt, filt_dstpad_idx, link->dst, dstpad_idx)) < 0) {
111 /* failed to link output filter to new filter */
112 link->dst->inputs[dstpad_idx] = link;
116 /* re-hookup the link to the new destination filter we inserted */
118 link->dstpad = &filt->input_pads[filt_srcpad_idx];
119 filt->inputs[filt_srcpad_idx] = link;
121 /* if any information on supported media formats already exists on the
122 * link, we need to preserve that */
123 if (link->out_formats)
124 ff_formats_changeref(&link->out_formats,
125 &filt->outputs[filt_dstpad_idx]->out_formats);
126 if (link->out_samplerates)
127 ff_formats_changeref(&link->out_samplerates,
128 &filt->outputs[filt_dstpad_idx]->out_samplerates);
129 if (link->out_channel_layouts)
130 ff_channel_layouts_changeref(&link->out_channel_layouts,
131 &filt->outputs[filt_dstpad_idx]->out_channel_layouts);
136 int avfilter_config_links(AVFilterContext *filter)
138 int (*config_link)(AVFilterLink *);
142 for (i = 0; i < filter->nb_inputs; i ++) {
143 AVFilterLink *link = filter->inputs[i];
147 switch (link->init_state) {
150 case AVLINK_STARTINIT:
151 av_log(filter, AV_LOG_INFO, "circular filter chain detected\n");
154 link->init_state = AVLINK_STARTINIT;
156 if ((ret = avfilter_config_links(link->src)) < 0)
159 if (!(config_link = link->srcpad->config_props)) {
160 if (link->src->nb_inputs != 1) {
161 av_log(link->src, AV_LOG_ERROR, "Source filters and filters "
162 "with more than one input "
163 "must set config_props() "
164 "callbacks on all outputs\n");
165 return AVERROR(EINVAL);
167 } else if ((ret = config_link(link)) < 0) {
168 av_log(link->src, AV_LOG_ERROR,
169 "Failed to configure output pad on %s\n",
174 if (link->time_base.num == 0 && link->time_base.den == 0)
175 link->time_base = link->src && link->src->nb_inputs ?
176 link->src->inputs[0]->time_base : AV_TIME_BASE_Q;
178 if (link->type == AVMEDIA_TYPE_VIDEO) {
179 if (!link->sample_aspect_ratio.num && !link->sample_aspect_ratio.den)
180 link->sample_aspect_ratio = link->src->nb_inputs ?
181 link->src->inputs[0]->sample_aspect_ratio : (AVRational){1,1};
183 if (link->src->nb_inputs) {
185 link->w = link->src->inputs[0]->w;
187 link->h = link->src->inputs[0]->h;
188 } else if (!link->w || !link->h) {
189 av_log(link->src, AV_LOG_ERROR,
190 "Video source filters must set their output link's "
191 "width and height\n");
192 return AVERROR(EINVAL);
196 if ((config_link = link->dstpad->config_props))
197 if ((ret = config_link(link)) < 0) {
198 av_log(link->src, AV_LOG_ERROR,
199 "Failed to configure input pad on %s\n",
204 link->init_state = AVLINK_INIT;
211 void ff_dlog_link(void *ctx, AVFilterLink *link, int end)
213 if (link->type == AVMEDIA_TYPE_VIDEO) {
215 "link[%p s:%dx%d fmt:%-16s %-16s->%-16s]%s",
216 link, link->w, link->h,
217 av_pix_fmt_descriptors[link->format].name,
218 link->src ? link->src->filter->name : "",
219 link->dst ? link->dst->filter->name : "",
223 av_get_channel_layout_string(buf, sizeof(buf), -1, link->channel_layout);
226 "link[%p r:%d cl:%s fmt:%-16s %-16s->%-16s]%s",
227 link, link->sample_rate, buf,
228 av_get_sample_fmt_name(link->format),
229 link->src ? link->src->filter->name : "",
230 link->dst ? link->dst->filter->name : "",
235 int ff_request_frame(AVFilterLink *link)
237 FF_DPRINTF_START(NULL, request_frame); ff_dlog_link(NULL, link, 1);
239 if (link->srcpad->request_frame)
240 return link->srcpad->request_frame(link);
241 else if (link->src->inputs[0])
242 return ff_request_frame(link->src->inputs[0]);
246 int ff_poll_frame(AVFilterLink *link)
248 int i, min = INT_MAX;
250 if (link->srcpad->poll_frame)
251 return link->srcpad->poll_frame(link);
253 for (i = 0; i < link->src->nb_inputs; i++) {
255 if (!link->src->inputs[i])
257 val = ff_poll_frame(link->src->inputs[i]);
258 min = FFMIN(min, val);
264 #define MAX_REGISTERED_AVFILTERS_NB 64
266 static AVFilter *registered_avfilters[MAX_REGISTERED_AVFILTERS_NB + 1];
268 static int next_registered_avfilter_idx = 0;
270 AVFilter *avfilter_get_by_name(const char *name)
274 for (i = 0; registered_avfilters[i]; i++)
275 if (!strcmp(registered_avfilters[i]->name, name))
276 return registered_avfilters[i];
281 int avfilter_register(AVFilter *filter)
283 if (next_registered_avfilter_idx == MAX_REGISTERED_AVFILTERS_NB)
286 registered_avfilters[next_registered_avfilter_idx++] = filter;
290 AVFilter **av_filter_next(AVFilter **filter)
292 return filter ? ++filter : ®istered_avfilters[0];
295 void avfilter_uninit(void)
297 memset(registered_avfilters, 0, sizeof(registered_avfilters));
298 next_registered_avfilter_idx = 0;
301 static int pad_count(const AVFilterPad *pads)
305 for(count = 0; pads->name; count ++) pads ++;
309 static const char *filter_name(void *p)
311 AVFilterContext *filter = p;
312 return filter->filter->name;
315 static const AVClass avfilter_class = {
319 LIBAVUTIL_VERSION_INT,
322 int avfilter_open(AVFilterContext **filter_ctx, AVFilter *filter, const char *inst_name)
324 AVFilterContext *ret;
328 return AVERROR(EINVAL);
330 ret = av_mallocz(sizeof(AVFilterContext));
332 return AVERROR(ENOMEM);
334 ret->av_class = &avfilter_class;
335 ret->filter = filter;
336 ret->name = inst_name ? av_strdup(inst_name) : NULL;
337 if (filter->priv_size) {
338 ret->priv = av_mallocz(filter->priv_size);
343 ret->nb_inputs = pad_count(filter->inputs);
344 if (ret->nb_inputs ) {
345 ret->input_pads = av_malloc(sizeof(AVFilterPad) * ret->nb_inputs);
346 if (!ret->input_pads)
348 memcpy(ret->input_pads, filter->inputs, sizeof(AVFilterPad) * ret->nb_inputs);
349 ret->inputs = av_mallocz(sizeof(AVFilterLink*) * ret->nb_inputs);
354 ret->nb_outputs = pad_count(filter->outputs);
355 if (ret->nb_outputs) {
356 ret->output_pads = av_malloc(sizeof(AVFilterPad) * ret->nb_outputs);
357 if (!ret->output_pads)
359 memcpy(ret->output_pads, filter->outputs, sizeof(AVFilterPad) * ret->nb_outputs);
360 ret->outputs = av_mallocz(sizeof(AVFilterLink*) * ret->nb_outputs);
365 ret->output_count = ret->nb_outputs;
366 ret->input_count = ret->nb_inputs;
373 av_freep(&ret->inputs);
374 av_freep(&ret->input_pads);
376 av_freep(&ret->outputs);
377 av_freep(&ret->output_pads);
379 av_freep(&ret->priv);
381 return AVERROR(ENOMEM);
384 void avfilter_free(AVFilterContext *filter)
389 if (filter->filter->uninit)
390 filter->filter->uninit(filter);
392 for (i = 0; i < filter->nb_inputs; i++) {
393 if ((link = filter->inputs[i])) {
395 link->src->outputs[link->srcpad - link->src->output_pads] = NULL;
396 ff_formats_unref(&link->in_formats);
397 ff_formats_unref(&link->out_formats);
398 ff_formats_unref(&link->in_samplerates);
399 ff_formats_unref(&link->out_samplerates);
400 ff_channel_layouts_unref(&link->in_channel_layouts);
401 ff_channel_layouts_unref(&link->out_channel_layouts);
405 for (i = 0; i < filter->nb_outputs; i++) {
406 if ((link = filter->outputs[i])) {
408 link->dst->inputs[link->dstpad - link->dst->input_pads] = NULL;
409 ff_formats_unref(&link->in_formats);
410 ff_formats_unref(&link->out_formats);
411 ff_formats_unref(&link->in_samplerates);
412 ff_formats_unref(&link->out_samplerates);
413 ff_channel_layouts_unref(&link->in_channel_layouts);
414 ff_channel_layouts_unref(&link->out_channel_layouts);
419 av_freep(&filter->name);
420 av_freep(&filter->input_pads);
421 av_freep(&filter->output_pads);
422 av_freep(&filter->inputs);
423 av_freep(&filter->outputs);
424 av_freep(&filter->priv);
428 int avfilter_init_filter(AVFilterContext *filter, const char *args, void *opaque)
432 if (filter->filter->init)
433 ret = filter->filter->init(filter, args);
437 const char *avfilter_pad_get_name(AVFilterPad *pads, int pad_idx)
439 return pads[pad_idx].name;
442 enum AVMediaType avfilter_pad_get_type(AVFilterPad *pads, int pad_idx)
444 return pads[pad_idx].type;