3 * copyright (c) 2007 Bobby Bingham
5 * This file is part of FFmpeg.
7 * FFmpeg 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 * FFmpeg 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 FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
24 #include "libavutil/pixdesc.h"
25 #include "libavutil/rational.h"
26 #include "libavcore/imgutils.h"
30 unsigned avfilter_version(void) {
31 return LIBAVFILTER_VERSION_INT;
34 const char *avfilter_configuration(void)
36 return FFMPEG_CONFIGURATION;
39 const char *avfilter_license(void)
41 #define LICENSE_PREFIX "libavfilter license: "
42 return LICENSE_PREFIX FFMPEG_LICENSE + sizeof(LICENSE_PREFIX) - 1;
45 AVFilterBufferRef *avfilter_ref_buffer(AVFilterBufferRef *ref, int pmask)
47 AVFilterBufferRef *ret = av_malloc(sizeof(AVFilterBufferRef));
51 if (ref->type == AVMEDIA_TYPE_VIDEO) {
52 ret->video = av_malloc(sizeof(AVFilterBufferRefVideoProps));
57 *ret->video = *ref->video;
58 } else if (ref->type == AVMEDIA_TYPE_AUDIO) {
59 ret->audio = av_malloc(sizeof(AVFilterBufferRefAudioProps));
64 *ret->audio = *ref->audio;
67 ret->buf->refcount ++;
71 void avfilter_unref_buffer(AVFilterBufferRef *ref)
73 if (!(--ref->buf->refcount))
74 ref->buf->free(ref->buf);
80 void avfilter_insert_pad(unsigned idx, unsigned *count, size_t padidx_off,
81 AVFilterPad **pads, AVFilterLink ***links,
86 idx = FFMIN(idx, *count);
88 *pads = av_realloc(*pads, sizeof(AVFilterPad) * (*count + 1));
89 *links = av_realloc(*links, sizeof(AVFilterLink*) * (*count + 1));
90 memmove(*pads +idx+1, *pads +idx, sizeof(AVFilterPad) * (*count-idx));
91 memmove(*links+idx+1, *links+idx, sizeof(AVFilterLink*) * (*count-idx));
92 memcpy(*pads+idx, newpad, sizeof(AVFilterPad));
96 for (i = idx+1; i < *count; i++)
98 (*(unsigned *)((uint8_t *) *links[i] + padidx_off))++;
101 int avfilter_link(AVFilterContext *src, unsigned srcpad,
102 AVFilterContext *dst, unsigned dstpad)
106 if (src->output_count <= srcpad || dst->input_count <= dstpad ||
107 src->outputs[srcpad] || dst->inputs[dstpad])
110 src->outputs[srcpad] =
111 dst-> inputs[dstpad] = link = av_mallocz(sizeof(AVFilterLink));
115 link->srcpad = &src->output_pads[srcpad];
116 link->dstpad = &dst->input_pads[dstpad];
117 link->type = src->output_pads[srcpad].type;
118 assert(PIX_FMT_NONE == -1 && AV_SAMPLE_FMT_NONE == -1);
124 int avfilter_insert_filter(AVFilterLink *link, AVFilterContext *filt,
125 unsigned filt_srcpad_idx, unsigned filt_dstpad_idx)
128 unsigned dstpad_idx = link->dstpad - link->dst->input_pads;
130 av_log(link->dst, AV_LOG_INFO, "auto-inserting filter '%s' "
131 "between the filter '%s' and the filter '%s'\n",
132 filt->name, link->src->name, link->dst->name);
134 link->dst->inputs[dstpad_idx] = NULL;
135 if ((ret = avfilter_link(filt, filt_dstpad_idx, link->dst, dstpad_idx)) < 0) {
136 /* failed to link output filter to new filter */
137 link->dst->inputs[dstpad_idx] = link;
141 /* re-hookup the link to the new destination filter we inserted */
143 link->dstpad = &filt->input_pads[filt_srcpad_idx];
144 filt->inputs[filt_srcpad_idx] = link;
146 /* if any information on supported media formats already exists on the
147 * link, we need to preserve that */
148 if (link->out_formats)
149 avfilter_formats_changeref(&link->out_formats,
150 &filt->outputs[filt_dstpad_idx]->out_formats);
155 int avfilter_config_links(AVFilterContext *filter)
157 int (*config_link)(AVFilterLink *);
161 for (i = 0; i < filter->input_count; i ++) {
162 AVFilterLink *link = filter->inputs[i];
166 switch (link->init_state) {
169 case AVLINK_STARTINIT:
170 av_log(filter, AV_LOG_INFO, "circular filter chain detected\n");
173 link->init_state = AVLINK_STARTINIT;
175 if ((ret = avfilter_config_links(link->src)) < 0)
178 if (!(config_link = link->srcpad->config_props))
179 config_link = avfilter_default_config_output_link;
180 if ((ret = config_link(link)) < 0)
183 if (link->time_base.num == 0 && link->time_base.den == 0)
184 link->time_base = link->src && link->src->input_count ?
185 link->src->inputs[0]->time_base : AV_TIME_BASE_Q;
187 if ((config_link = link->dstpad->config_props))
188 if ((ret = config_link(link)) < 0)
191 link->init_state = AVLINK_INIT;
198 char *ff_get_ref_perms_string(char *buf, size_t buf_size, int perms)
200 snprintf(buf, buf_size, "%s%s%s%s%s",
201 perms & AV_PERM_READ ? "r" : "",
202 perms & AV_PERM_WRITE ? "w" : "",
203 perms & AV_PERM_PRESERVE ? "p" : "",
204 perms & AV_PERM_REUSE ? "r" : "",
205 perms & AV_PERM_REUSE2 ? "R" : "");
209 void ff_dprintf_ref(void *ctx, AVFilterBufferRef *ref, int end)
211 av_unused char buf[16];
213 "ref[%p buf:%p refcount:%d perms:%s data:%p linesize[%d, %d, %d, %d] pts:%"PRId64" pos:%"PRId64,
214 ref, ref->buf, ref->buf->refcount, ff_get_ref_perms_string(buf, sizeof(buf), ref->perms), ref->data[0],
215 ref->linesize[0], ref->linesize[1], ref->linesize[2], ref->linesize[3],
219 dprintf(ctx, " a:%d/%d s:%dx%d i:%c",
220 ref->video->pixel_aspect.num, ref->video->pixel_aspect.den,
221 ref->video->w, ref->video->h,
222 !ref->video->interlaced ? 'P' : /* Progressive */
223 ref->video->top_field_first ? 'T' : 'B'); /* Top / Bottom */
226 dprintf(ctx, " cl:%"PRId64"d sn:%d s:%d sr:%d p:%d",
227 ref->audio->channel_layout,
228 ref->audio->samples_nb,
230 ref->audio->sample_rate,
234 dprintf(ctx, "]%s", end ? "\n" : "");
237 void ff_dprintf_link(void *ctx, AVFilterLink *link, int end)
240 "link[%p s:%dx%d fmt:%-16s %-16s->%-16s]%s",
241 link, link->w, link->h,
242 av_pix_fmt_descriptors[link->format].name,
243 link->src ? link->src->filter->name : "",
244 link->dst ? link->dst->filter->name : "",
248 AVFilterBufferRef *avfilter_get_video_buffer(AVFilterLink *link, int perms, int w, int h)
250 AVFilterBufferRef *ret = NULL;
252 av_unused char buf[16];
253 FF_DPRINTF_START(NULL, get_video_buffer); ff_dprintf_link(NULL, link, 0);
254 dprintf(NULL, " perms:%s w:%d h:%d\n", ff_get_ref_perms_string(buf, sizeof(buf), perms), w, h);
256 if (link->dstpad->get_video_buffer)
257 ret = link->dstpad->get_video_buffer(link, perms, w, h);
260 ret = avfilter_default_get_video_buffer(link, perms, w, h);
263 ret->type = AVMEDIA_TYPE_VIDEO;
265 FF_DPRINTF_START(NULL, get_video_buffer); ff_dprintf_link(NULL, link, 0); dprintf(NULL, " returning "); ff_dprintf_ref(NULL, ret, 1);
270 AVFilterBufferRef *avfilter_get_audio_buffer(AVFilterLink *link, int perms,
271 enum AVSampleFormat sample_fmt, int size,
272 int64_t channel_layout, int planar)
274 AVFilterBufferRef *ret = NULL;
276 if (link->dstpad->get_audio_buffer)
277 ret = link->dstpad->get_audio_buffer(link, perms, sample_fmt, size, channel_layout, planar);
280 ret = avfilter_default_get_audio_buffer(link, perms, sample_fmt, size, channel_layout, planar);
283 ret->type = AVMEDIA_TYPE_AUDIO;
288 int avfilter_request_frame(AVFilterLink *link)
290 FF_DPRINTF_START(NULL, request_frame); ff_dprintf_link(NULL, link, 1);
292 if (link->srcpad->request_frame)
293 return link->srcpad->request_frame(link);
294 else if (link->src->inputs[0])
295 return avfilter_request_frame(link->src->inputs[0]);
299 int avfilter_poll_frame(AVFilterLink *link)
301 int i, min = INT_MAX;
303 if (link->srcpad->poll_frame)
304 return link->srcpad->poll_frame(link);
306 for (i = 0; i < link->src->input_count; i++) {
308 if (!link->src->inputs[i])
310 val = avfilter_poll_frame(link->src->inputs[i]);
311 min = FFMIN(min, val);
317 /* XXX: should we do the duplicating of the picture ref here, instead of
318 * forcing the source filter to do it? */
319 void avfilter_start_frame(AVFilterLink *link, AVFilterBufferRef *picref)
321 void (*start_frame)(AVFilterLink *, AVFilterBufferRef *);
322 AVFilterPad *dst = link->dstpad;
324 FF_DPRINTF_START(NULL, start_frame); ff_dprintf_link(NULL, link, 0); dprintf(NULL, " "); ff_dprintf_ref(NULL, picref, 1);
326 if (!(start_frame = dst->start_frame))
327 start_frame = avfilter_default_start_frame;
329 /* prepare to copy the picture if it has insufficient permissions */
330 if ((dst->min_perms & picref->perms) != dst->min_perms ||
331 dst->rej_perms & picref->perms) {
332 av_log(link->dst, AV_LOG_DEBUG,
333 "frame copy needed (have perms %x, need %x, reject %x)\n",
335 link->dstpad->min_perms, link->dstpad->rej_perms);
337 link->cur_buf = avfilter_get_video_buffer(link, dst->min_perms, link->w, link->h);
338 link->src_buf = picref;
339 avfilter_copy_buffer_ref_props(link->cur_buf, link->src_buf);
342 link->cur_buf = picref;
344 start_frame(link, link->cur_buf);
347 void avfilter_end_frame(AVFilterLink *link)
349 void (*end_frame)(AVFilterLink *);
351 if (!(end_frame = link->dstpad->end_frame))
352 end_frame = avfilter_default_end_frame;
356 /* unreference the source picture if we're feeding the destination filter
357 * a copied version dues to permission issues */
359 avfilter_unref_buffer(link->src_buf);
360 link->src_buf = NULL;
364 void avfilter_draw_slice(AVFilterLink *link, int y, int h, int slice_dir)
366 uint8_t *src[4], *dst[4];
368 void (*draw_slice)(AVFilterLink *, int, int, int);
370 FF_DPRINTF_START(NULL, draw_slice); ff_dprintf_link(NULL, link, 0); dprintf(NULL, " y:%d h:%d dir:%d\n", y, h, slice_dir);
372 /* copy the slice if needed for permission reasons */
374 vsub = av_pix_fmt_descriptors[link->format].log2_chroma_h;
376 for (i = 0; i < 4; i++) {
377 if (link->src_buf->data[i]) {
378 src[i] = link->src_buf-> data[i] +
379 (y >> (i==0 ? 0 : vsub)) * link->src_buf-> linesize[i];
380 dst[i] = link->cur_buf->data[i] +
381 (y >> (i==0 ? 0 : vsub)) * link->cur_buf->linesize[i];
383 src[i] = dst[i] = NULL;
386 for (i = 0; i < 4; i++) {
388 av_image_get_linesize(link->format, link->cur_buf->video->w, i);
390 if (!src[i]) continue;
392 for (j = 0; j < h >> (i==0 ? 0 : vsub); j++) {
393 memcpy(dst[i], src[i], planew);
394 src[i] += link->src_buf->linesize[i];
395 dst[i] += link->cur_buf->linesize[i];
400 if (!(draw_slice = link->dstpad->draw_slice))
401 draw_slice = avfilter_default_draw_slice;
402 draw_slice(link, y, h, slice_dir);
405 void avfilter_filter_samples(AVFilterLink *link, AVFilterBufferRef *samplesref)
407 void (*filter_samples)(AVFilterLink *, AVFilterBufferRef *);
408 AVFilterPad *dst = link->dstpad;
410 if (!(filter_samples = dst->filter_samples))
411 filter_samples = avfilter_default_filter_samples;
413 /* prepare to copy the samples if the buffer has insufficient permissions */
414 if ((dst->min_perms & samplesref->perms) != dst->min_perms ||
415 dst->rej_perms & samplesref->perms) {
417 av_log(link->dst, AV_LOG_DEBUG,
418 "Copying audio data in avfilter (have perms %x, need %x, reject %x)\n",
419 samplesref->perms, link->dstpad->min_perms, link->dstpad->rej_perms);
421 link->cur_buf = avfilter_default_get_audio_buffer(link, dst->min_perms,
423 samplesref->audio->size,
424 samplesref->audio->channel_layout,
425 samplesref->audio->planar);
426 link->cur_buf->pts = samplesref->pts;
427 link->cur_buf->audio->sample_rate = samplesref->audio->sample_rate;
429 /* Copy actual data into new samples buffer */
430 memcpy(link->cur_buf->data[0], samplesref->data[0], samplesref->audio->size);
432 avfilter_unref_buffer(samplesref);
434 link->cur_buf = samplesref;
436 filter_samples(link, link->cur_buf);
439 #define MAX_REGISTERED_AVFILTERS_NB 64
441 static AVFilter *registered_avfilters[MAX_REGISTERED_AVFILTERS_NB + 1];
443 static int next_registered_avfilter_idx = 0;
445 AVFilter *avfilter_get_by_name(const char *name)
449 for (i = 0; registered_avfilters[i]; i++)
450 if (!strcmp(registered_avfilters[i]->name, name))
451 return registered_avfilters[i];
456 int avfilter_register(AVFilter *filter)
458 if (next_registered_avfilter_idx == MAX_REGISTERED_AVFILTERS_NB)
461 registered_avfilters[next_registered_avfilter_idx++] = filter;
465 AVFilter **av_filter_next(AVFilter **filter)
467 return filter ? ++filter : ®istered_avfilters[0];
470 void avfilter_uninit(void)
472 memset(registered_avfilters, 0, sizeof(registered_avfilters));
473 next_registered_avfilter_idx = 0;
476 static int pad_count(const AVFilterPad *pads)
480 for(count = 0; pads->name; count ++) pads ++;
484 static const char *filter_name(void *p)
486 AVFilterContext *filter = p;
487 return filter->filter->name;
490 static const AVClass avfilter_class = {
494 LIBAVUTIL_VERSION_INT,
497 int avfilter_open(AVFilterContext **filter_ctx, AVFilter *filter, const char *inst_name)
499 AVFilterContext *ret;
503 return AVERROR(EINVAL);
505 ret = av_mallocz(sizeof(AVFilterContext));
507 ret->av_class = &avfilter_class;
508 ret->filter = filter;
509 ret->name = inst_name ? av_strdup(inst_name) : NULL;
510 ret->priv = av_mallocz(filter->priv_size);
512 ret->input_count = pad_count(filter->inputs);
513 if (ret->input_count) {
514 ret->input_pads = av_malloc(sizeof(AVFilterPad) * ret->input_count);
515 memcpy(ret->input_pads, filter->inputs, sizeof(AVFilterPad) * ret->input_count);
516 ret->inputs = av_mallocz(sizeof(AVFilterLink*) * ret->input_count);
519 ret->output_count = pad_count(filter->outputs);
520 if (ret->output_count) {
521 ret->output_pads = av_malloc(sizeof(AVFilterPad) * ret->output_count);
522 memcpy(ret->output_pads, filter->outputs, sizeof(AVFilterPad) * ret->output_count);
523 ret->outputs = av_mallocz(sizeof(AVFilterLink*) * ret->output_count);
530 void avfilter_free(AVFilterContext *filter)
535 if (filter->filter->uninit)
536 filter->filter->uninit(filter);
538 for (i = 0; i < filter->input_count; i++) {
539 if ((link = filter->inputs[i])) {
541 link->src->outputs[link->srcpad - link->src->output_pads] = NULL;
542 avfilter_formats_unref(&link->in_formats);
543 avfilter_formats_unref(&link->out_formats);
547 for (i = 0; i < filter->output_count; i++) {
548 if ((link = filter->outputs[i])) {
550 link->dst->inputs[link->dstpad - link->dst->input_pads] = NULL;
551 avfilter_formats_unref(&link->in_formats);
552 avfilter_formats_unref(&link->out_formats);
557 av_freep(&filter->name);
558 av_freep(&filter->input_pads);
559 av_freep(&filter->output_pads);
560 av_freep(&filter->inputs);
561 av_freep(&filter->outputs);
562 av_freep(&filter->priv);
566 int avfilter_init_filter(AVFilterContext *filter, const char *args, void *opaque)
570 if (filter->filter->init)
571 ret = filter->filter->init(filter, args, opaque);