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/channel_layout.h"
25 #include "libavutil/common.h"
26 #include "libavutil/imgutils.h"
27 #include "libavutil/pixdesc.h"
28 #include "libavutil/rational.h"
29 #include "libavutil/samplefmt.h"
37 unsigned avfilter_version(void) {
38 return LIBAVFILTER_VERSION_INT;
41 const char *avfilter_configuration(void)
43 return LIBAV_CONFIGURATION;
46 const char *avfilter_license(void)
48 #define LICENSE_PREFIX "libavfilter license: "
49 return LICENSE_PREFIX LIBAV_LICENSE + sizeof(LICENSE_PREFIX) - 1;
52 void ff_insert_pad(unsigned idx, unsigned *count, size_t padidx_off,
53 AVFilterPad **pads, AVFilterLink ***links,
58 idx = FFMIN(idx, *count);
60 *pads = av_realloc(*pads, sizeof(AVFilterPad) * (*count + 1));
61 *links = av_realloc(*links, sizeof(AVFilterLink*) * (*count + 1));
62 memmove(*pads +idx+1, *pads +idx, sizeof(AVFilterPad) * (*count-idx));
63 memmove(*links+idx+1, *links+idx, sizeof(AVFilterLink*) * (*count-idx));
64 memcpy(*pads+idx, newpad, sizeof(AVFilterPad));
68 for (i = idx+1; i < *count; i++)
70 (*(unsigned *)((uint8_t *) *links[i] + padidx_off))++;
73 int avfilter_link(AVFilterContext *src, unsigned srcpad,
74 AVFilterContext *dst, unsigned dstpad)
78 if (src->nb_outputs <= srcpad || dst->nb_inputs <= dstpad ||
79 src->outputs[srcpad] || dst->inputs[dstpad])
82 if (src->output_pads[srcpad].type != dst->input_pads[dstpad].type) {
83 av_log(src, AV_LOG_ERROR,
84 "Media type mismatch between the '%s' filter output pad %d and the '%s' filter input pad %d\n",
85 src->name, srcpad, dst->name, dstpad);
86 return AVERROR(EINVAL);
89 src->outputs[srcpad] =
90 dst-> inputs[dstpad] = link = av_mallocz(sizeof(AVFilterLink));
94 link->srcpad = &src->output_pads[srcpad];
95 link->dstpad = &dst->input_pads[dstpad];
96 link->type = src->output_pads[srcpad].type;
97 assert(AV_PIX_FMT_NONE == -1 && AV_SAMPLE_FMT_NONE == -1);
103 int avfilter_insert_filter(AVFilterLink *link, AVFilterContext *filt,
104 unsigned filt_srcpad_idx, unsigned filt_dstpad_idx)
107 unsigned dstpad_idx = link->dstpad - link->dst->input_pads;
109 av_log(link->dst, AV_LOG_VERBOSE, "auto-inserting filter '%s' "
110 "between the filter '%s' and the filter '%s'\n",
111 filt->name, link->src->name, link->dst->name);
113 link->dst->inputs[dstpad_idx] = NULL;
114 if ((ret = avfilter_link(filt, filt_dstpad_idx, link->dst, dstpad_idx)) < 0) {
115 /* failed to link output filter to new filter */
116 link->dst->inputs[dstpad_idx] = link;
120 /* re-hookup the link to the new destination filter we inserted */
122 link->dstpad = &filt->input_pads[filt_srcpad_idx];
123 filt->inputs[filt_srcpad_idx] = link;
125 /* if any information on supported media formats already exists on the
126 * link, we need to preserve that */
127 if (link->out_formats)
128 ff_formats_changeref(&link->out_formats,
129 &filt->outputs[filt_dstpad_idx]->out_formats);
130 if (link->out_samplerates)
131 ff_formats_changeref(&link->out_samplerates,
132 &filt->outputs[filt_dstpad_idx]->out_samplerates);
133 if (link->out_channel_layouts)
134 ff_channel_layouts_changeref(&link->out_channel_layouts,
135 &filt->outputs[filt_dstpad_idx]->out_channel_layouts);
140 int avfilter_config_links(AVFilterContext *filter)
142 int (*config_link)(AVFilterLink *);
146 for (i = 0; i < filter->nb_inputs; i ++) {
147 AVFilterLink *link = filter->inputs[i];
151 switch (link->init_state) {
154 case AVLINK_STARTINIT:
155 av_log(filter, AV_LOG_INFO, "circular filter chain detected\n");
158 link->init_state = AVLINK_STARTINIT;
160 if ((ret = avfilter_config_links(link->src)) < 0)
163 if (!(config_link = link->srcpad->config_props)) {
164 if (link->src->nb_inputs != 1) {
165 av_log(link->src, AV_LOG_ERROR, "Source filters and filters "
166 "with more than one input "
167 "must set config_props() "
168 "callbacks on all outputs\n");
169 return AVERROR(EINVAL);
171 } else if ((ret = config_link(link)) < 0) {
172 av_log(link->src, AV_LOG_ERROR,
173 "Failed to configure output pad on %s\n",
178 if (link->time_base.num == 0 && link->time_base.den == 0)
179 link->time_base = link->src && link->src->nb_inputs ?
180 link->src->inputs[0]->time_base : AV_TIME_BASE_Q;
182 if (link->type == AVMEDIA_TYPE_VIDEO) {
183 if (!link->sample_aspect_ratio.num && !link->sample_aspect_ratio.den)
184 link->sample_aspect_ratio = link->src->nb_inputs ?
185 link->src->inputs[0]->sample_aspect_ratio : (AVRational){1,1};
187 if (link->src->nb_inputs) {
189 link->w = link->src->inputs[0]->w;
191 link->h = link->src->inputs[0]->h;
192 } else if (!link->w || !link->h) {
193 av_log(link->src, AV_LOG_ERROR,
194 "Video source filters must set their output link's "
195 "width and height\n");
196 return AVERROR(EINVAL);
200 if ((config_link = link->dstpad->config_props))
201 if ((ret = config_link(link)) < 0) {
202 av_log(link->src, AV_LOG_ERROR,
203 "Failed to configure input pad on %s\n",
208 link->init_state = AVLINK_INIT;
215 void ff_dlog_link(void *ctx, AVFilterLink *link, int end)
217 if (link->type == AVMEDIA_TYPE_VIDEO) {
219 "link[%p s:%dx%d fmt:%-16s %-16s->%-16s]%s",
220 link, link->w, link->h,
221 av_get_pix_fmt_name(link->format),
222 link->src ? link->src->filter->name : "",
223 link->dst ? link->dst->filter->name : "",
227 av_get_channel_layout_string(buf, sizeof(buf), -1, link->channel_layout);
230 "link[%p r:%d cl:%s fmt:%-16s %-16s->%-16s]%s",
231 link, link->sample_rate, buf,
232 av_get_sample_fmt_name(link->format),
233 link->src ? link->src->filter->name : "",
234 link->dst ? link->dst->filter->name : "",
239 int ff_request_frame(AVFilterLink *link)
241 FF_DPRINTF_START(NULL, request_frame); ff_dlog_link(NULL, link, 1);
243 if (link->srcpad->request_frame)
244 return link->srcpad->request_frame(link);
245 else if (link->src->inputs[0])
246 return ff_request_frame(link->src->inputs[0]);
250 int ff_poll_frame(AVFilterLink *link)
252 int i, min = INT_MAX;
254 if (link->srcpad->poll_frame)
255 return link->srcpad->poll_frame(link);
257 for (i = 0; i < link->src->nb_inputs; i++) {
259 if (!link->src->inputs[i])
261 val = ff_poll_frame(link->src->inputs[i]);
262 min = FFMIN(min, val);
268 #define MAX_REGISTERED_AVFILTERS_NB 64
270 static AVFilter *registered_avfilters[MAX_REGISTERED_AVFILTERS_NB + 1];
272 static int next_registered_avfilter_idx = 0;
274 AVFilter *avfilter_get_by_name(const char *name)
278 for (i = 0; registered_avfilters[i]; i++)
279 if (!strcmp(registered_avfilters[i]->name, name))
280 return registered_avfilters[i];
285 int avfilter_register(AVFilter *filter)
287 if (next_registered_avfilter_idx == MAX_REGISTERED_AVFILTERS_NB)
290 registered_avfilters[next_registered_avfilter_idx++] = filter;
294 AVFilter **av_filter_next(AVFilter **filter)
296 return filter ? ++filter : ®istered_avfilters[0];
299 void avfilter_uninit(void)
301 memset(registered_avfilters, 0, sizeof(registered_avfilters));
302 next_registered_avfilter_idx = 0;
305 static int pad_count(const AVFilterPad *pads)
312 for(count = 0; pads->name; count ++) pads ++;
316 static const char *filter_name(void *p)
318 AVFilterContext *filter = p;
319 return filter->filter->name;
322 static const AVClass avfilter_class = {
326 LIBAVUTIL_VERSION_INT,
329 int avfilter_open(AVFilterContext **filter_ctx, AVFilter *filter, const char *inst_name)
331 AVFilterContext *ret;
335 return AVERROR(EINVAL);
337 ret = av_mallocz(sizeof(AVFilterContext));
339 return AVERROR(ENOMEM);
341 ret->av_class = &avfilter_class;
342 ret->filter = filter;
343 ret->name = inst_name ? av_strdup(inst_name) : NULL;
344 if (filter->priv_size) {
345 ret->priv = av_mallocz(filter->priv_size);
350 ret->nb_inputs = pad_count(filter->inputs);
351 if (ret->nb_inputs ) {
352 ret->input_pads = av_malloc(sizeof(AVFilterPad) * ret->nb_inputs);
353 if (!ret->input_pads)
355 memcpy(ret->input_pads, filter->inputs, sizeof(AVFilterPad) * ret->nb_inputs);
356 ret->inputs = av_mallocz(sizeof(AVFilterLink*) * ret->nb_inputs);
361 ret->nb_outputs = pad_count(filter->outputs);
362 if (ret->nb_outputs) {
363 ret->output_pads = av_malloc(sizeof(AVFilterPad) * ret->nb_outputs);
364 if (!ret->output_pads)
366 memcpy(ret->output_pads, filter->outputs, sizeof(AVFilterPad) * ret->nb_outputs);
367 ret->outputs = av_mallocz(sizeof(AVFilterLink*) * ret->nb_outputs);
372 ret->output_count = ret->nb_outputs;
373 ret->input_count = ret->nb_inputs;
380 av_freep(&ret->inputs);
381 av_freep(&ret->input_pads);
383 av_freep(&ret->outputs);
384 av_freep(&ret->output_pads);
386 av_freep(&ret->priv);
388 return AVERROR(ENOMEM);
391 void avfilter_free(AVFilterContext *filter)
396 if (filter->filter->uninit)
397 filter->filter->uninit(filter);
399 for (i = 0; i < filter->nb_inputs; i++) {
400 if ((link = filter->inputs[i])) {
402 link->src->outputs[link->srcpad - link->src->output_pads] = NULL;
403 ff_formats_unref(&link->in_formats);
404 ff_formats_unref(&link->out_formats);
405 ff_formats_unref(&link->in_samplerates);
406 ff_formats_unref(&link->out_samplerates);
407 ff_channel_layouts_unref(&link->in_channel_layouts);
408 ff_channel_layouts_unref(&link->out_channel_layouts);
412 for (i = 0; i < filter->nb_outputs; i++) {
413 if ((link = filter->outputs[i])) {
415 link->dst->inputs[link->dstpad - link->dst->input_pads] = NULL;
416 ff_formats_unref(&link->in_formats);
417 ff_formats_unref(&link->out_formats);
418 ff_formats_unref(&link->in_samplerates);
419 ff_formats_unref(&link->out_samplerates);
420 ff_channel_layouts_unref(&link->in_channel_layouts);
421 ff_channel_layouts_unref(&link->out_channel_layouts);
426 av_freep(&filter->name);
427 av_freep(&filter->input_pads);
428 av_freep(&filter->output_pads);
429 av_freep(&filter->inputs);
430 av_freep(&filter->outputs);
431 av_freep(&filter->priv);
435 int avfilter_init_filter(AVFilterContext *filter, const char *args, void *opaque)
439 if (filter->filter->init)
440 ret = filter->filter->init(filter, args);
444 const char *avfilter_pad_get_name(AVFilterPad *pads, int pad_idx)
446 return pads[pad_idx].name;
449 enum AVMediaType avfilter_pad_get_type(AVFilterPad *pads, int pad_idx)
451 return pads[pad_idx].type;
454 static int default_filter_frame(AVFilterLink *link, AVFilterBufferRef *frame)
456 return ff_filter_frame(link->dst->outputs[0], frame);
459 int ff_filter_frame(AVFilterLink *link, AVFilterBufferRef *frame)
461 int (*filter_frame)(AVFilterLink *, AVFilterBufferRef *);
462 AVFilterPad *dst = link->dstpad;
463 AVFilterBufferRef *out;
464 int perms = frame->perms;
466 FF_DPRINTF_START(NULL, filter_frame);
467 ff_dlog_link(NULL, link, 1);
469 if (!(filter_frame = dst->filter_frame))
470 filter_frame = default_filter_frame;
472 if (frame->linesize[0] < 0)
473 perms |= AV_PERM_NEG_LINESIZES;
474 /* prepare to copy the frame if the buffer has insufficient permissions */
475 if ((dst->min_perms & perms) != dst->min_perms ||
476 dst->rej_perms & perms) {
477 av_log(link->dst, AV_LOG_DEBUG,
478 "Copying data in avfilter (have perms %x, need %x, reject %x)\n",
479 perms, link->dstpad->min_perms, link->dstpad->rej_perms);
481 switch (link->type) {
482 case AVMEDIA_TYPE_VIDEO:
483 out = ff_get_video_buffer(link, dst->min_perms,
486 case AVMEDIA_TYPE_AUDIO:
487 out = ff_get_audio_buffer(link, dst->min_perms,
488 frame->audio->nb_samples);
490 default: return AVERROR(EINVAL);
493 avfilter_unref_buffer(frame);
494 return AVERROR(ENOMEM);
496 avfilter_copy_buffer_ref_props(out, frame);
498 switch (link->type) {
499 case AVMEDIA_TYPE_VIDEO:
500 av_image_copy(out->data, out->linesize, frame->data, frame->linesize,
501 frame->format, frame->video->w, frame->video->h);
503 case AVMEDIA_TYPE_AUDIO:
504 av_samples_copy(out->extended_data, frame->extended_data,
505 0, 0, frame->audio->nb_samples,
506 av_get_channel_layout_nb_channels(frame->audio->channel_layout),
509 default: return AVERROR(EINVAL);
512 avfilter_unref_buffer(frame);
516 return filter_frame(link, out);