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)
75 if (!(--ref->buf->refcount))
76 ref->buf->free(ref->buf);
82 void avfilter_insert_pad(unsigned idx, unsigned *count, size_t padidx_off,
83 AVFilterPad **pads, AVFilterLink ***links,
88 idx = FFMIN(idx, *count);
90 *pads = av_realloc(*pads, sizeof(AVFilterPad) * (*count + 1));
91 *links = av_realloc(*links, sizeof(AVFilterLink*) * (*count + 1));
92 memmove(*pads +idx+1, *pads +idx, sizeof(AVFilterPad) * (*count-idx));
93 memmove(*links+idx+1, *links+idx, sizeof(AVFilterLink*) * (*count-idx));
94 memcpy(*pads+idx, newpad, sizeof(AVFilterPad));
98 for (i = idx+1; i < *count; i++)
100 (*(unsigned *)((uint8_t *) *links[i] + padidx_off))++;
103 int avfilter_link(AVFilterContext *src, unsigned srcpad,
104 AVFilterContext *dst, unsigned dstpad)
108 if (src->output_count <= srcpad || dst->input_count <= dstpad ||
109 src->outputs[srcpad] || dst->inputs[dstpad])
112 if (src->output_pads[srcpad].type != dst->input_pads[dstpad].type) {
113 av_log(src, AV_LOG_ERROR,
114 "Media type mismatch between the '%s' filter output pad %d and the '%s' filter input pad %d\n",
115 src->name, srcpad, dst->name, dstpad);
116 return AVERROR(EINVAL);
119 src->outputs[srcpad] =
120 dst-> inputs[dstpad] = link = av_mallocz(sizeof(AVFilterLink));
124 link->srcpad = &src->output_pads[srcpad];
125 link->dstpad = &dst->input_pads[dstpad];
126 link->type = src->output_pads[srcpad].type;
127 assert(PIX_FMT_NONE == -1 && AV_SAMPLE_FMT_NONE == -1);
133 int avfilter_insert_filter(AVFilterLink *link, AVFilterContext *filt,
134 unsigned filt_srcpad_idx, unsigned filt_dstpad_idx)
137 unsigned dstpad_idx = link->dstpad - link->dst->input_pads;
139 av_log(link->dst, AV_LOG_INFO, "auto-inserting filter '%s' "
140 "between the filter '%s' and the filter '%s'\n",
141 filt->name, link->src->name, link->dst->name);
143 link->dst->inputs[dstpad_idx] = NULL;
144 if ((ret = avfilter_link(filt, filt_dstpad_idx, link->dst, dstpad_idx)) < 0) {
145 /* failed to link output filter to new filter */
146 link->dst->inputs[dstpad_idx] = link;
150 /* re-hookup the link to the new destination filter we inserted */
152 link->dstpad = &filt->input_pads[filt_srcpad_idx];
153 filt->inputs[filt_srcpad_idx] = link;
155 /* if any information on supported media formats already exists on the
156 * link, we need to preserve that */
157 if (link->out_formats)
158 avfilter_formats_changeref(&link->out_formats,
159 &filt->outputs[filt_dstpad_idx]->out_formats);
164 int avfilter_config_links(AVFilterContext *filter)
166 int (*config_link)(AVFilterLink *);
170 for (i = 0; i < filter->input_count; i ++) {
171 AVFilterLink *link = filter->inputs[i];
175 switch (link->init_state) {
178 case AVLINK_STARTINIT:
179 av_log(filter, AV_LOG_INFO, "circular filter chain detected\n");
182 link->init_state = AVLINK_STARTINIT;
184 if ((ret = avfilter_config_links(link->src)) < 0)
187 if (!(config_link = link->srcpad->config_props))
188 config_link = avfilter_default_config_output_link;
189 if ((ret = config_link(link)) < 0)
192 if (link->time_base.num == 0 && link->time_base.den == 0)
193 link->time_base = link->src && link->src->input_count ?
194 link->src->inputs[0]->time_base : AV_TIME_BASE_Q;
196 if ((config_link = link->dstpad->config_props))
197 if ((ret = config_link(link)) < 0)
200 link->init_state = AVLINK_INIT;
207 char *ff_get_ref_perms_string(char *buf, size_t buf_size, int perms)
209 snprintf(buf, buf_size, "%s%s%s%s%s%s",
210 perms & AV_PERM_READ ? "r" : "",
211 perms & AV_PERM_WRITE ? "w" : "",
212 perms & AV_PERM_PRESERVE ? "p" : "",
213 perms & AV_PERM_REUSE ? "u" : "",
214 perms & AV_PERM_REUSE2 ? "U" : "",
215 perms & AV_PERM_NEG_LINESIZES ? "n" : "");
219 void ff_dprintf_ref(void *ctx, AVFilterBufferRef *ref, int end)
221 av_unused char buf[16];
223 "ref[%p buf:%p refcount:%d perms:%s data:%p linesize[%d, %d, %d, %d] pts:%"PRId64" pos:%"PRId64,
224 ref, ref->buf, ref->buf->refcount, ff_get_ref_perms_string(buf, sizeof(buf), ref->perms), ref->data[0],
225 ref->linesize[0], ref->linesize[1], ref->linesize[2], ref->linesize[3],
229 dprintf(ctx, " a:%d/%d s:%dx%d i:%c",
230 ref->video->pixel_aspect.num, ref->video->pixel_aspect.den,
231 ref->video->w, ref->video->h,
232 !ref->video->interlaced ? 'P' : /* Progressive */
233 ref->video->top_field_first ? 'T' : 'B'); /* Top / Bottom */
236 dprintf(ctx, " cl:%"PRId64"d sn:%d s:%d sr:%d p:%d",
237 ref->audio->channel_layout,
238 ref->audio->samples_nb,
240 ref->audio->sample_rate,
244 dprintf(ctx, "]%s", end ? "\n" : "");
247 void ff_dprintf_link(void *ctx, AVFilterLink *link, int end)
250 "link[%p s:%dx%d fmt:%-16s %-16s->%-16s]%s",
251 link, link->w, link->h,
252 av_pix_fmt_descriptors[link->format].name,
253 link->src ? link->src->filter->name : "",
254 link->dst ? link->dst->filter->name : "",
258 AVFilterBufferRef *avfilter_get_video_buffer(AVFilterLink *link, int perms, int w, int h)
260 AVFilterBufferRef *ret = NULL;
262 av_unused char buf[16];
263 FF_DPRINTF_START(NULL, get_video_buffer); ff_dprintf_link(NULL, link, 0);
264 dprintf(NULL, " perms:%s w:%d h:%d\n", ff_get_ref_perms_string(buf, sizeof(buf), perms), w, h);
266 if (link->dstpad->get_video_buffer)
267 ret = link->dstpad->get_video_buffer(link, perms, w, h);
270 ret = avfilter_default_get_video_buffer(link, perms, w, h);
273 ret->type = AVMEDIA_TYPE_VIDEO;
275 FF_DPRINTF_START(NULL, get_video_buffer); ff_dprintf_link(NULL, link, 0); dprintf(NULL, " returning "); ff_dprintf_ref(NULL, ret, 1);
281 avfilter_get_video_buffer_ref_from_arrays(uint8_t *data[4], int linesize[4], int perms,
282 int w, int h, enum PixelFormat format)
284 AVFilterBuffer *pic = av_mallocz(sizeof(AVFilterBuffer));
285 AVFilterBufferRef *picref = av_mallocz(sizeof(AVFilterBufferRef));
291 picref->buf->free = ff_avfilter_default_free_buffer;
292 if (!(picref->video = av_mallocz(sizeof(AVFilterBufferRefVideoProps))))
295 pic->w = picref->video->w = w;
296 pic->h = picref->video->h = h;
298 /* make sure the buffer gets read permission or it's useless for output */
299 picref->perms = perms | AV_PERM_READ;
302 picref->type = AVMEDIA_TYPE_VIDEO;
303 pic->format = picref->format = format;
305 memcpy(pic->data, data, sizeof(pic->data));
306 memcpy(pic->linesize, linesize, sizeof(pic->linesize));
307 memcpy(picref->data, pic->data, sizeof(picref->data));
308 memcpy(picref->linesize, pic->linesize, sizeof(picref->linesize));
313 if (picref && picref->video)
314 av_free(picref->video);
320 AVFilterBufferRef *avfilter_get_audio_buffer(AVFilterLink *link, int perms,
321 enum AVSampleFormat sample_fmt, int size,
322 int64_t channel_layout, int planar)
324 AVFilterBufferRef *ret = NULL;
326 if (link->dstpad->get_audio_buffer)
327 ret = link->dstpad->get_audio_buffer(link, perms, sample_fmt, size, channel_layout, planar);
330 ret = avfilter_default_get_audio_buffer(link, perms, sample_fmt, size, channel_layout, planar);
333 ret->type = AVMEDIA_TYPE_AUDIO;
338 int avfilter_request_frame(AVFilterLink *link)
340 FF_DPRINTF_START(NULL, request_frame); ff_dprintf_link(NULL, link, 1);
342 if (link->srcpad->request_frame)
343 return link->srcpad->request_frame(link);
344 else if (link->src->inputs[0])
345 return avfilter_request_frame(link->src->inputs[0]);
349 int avfilter_poll_frame(AVFilterLink *link)
351 int i, min = INT_MAX;
353 if (link->srcpad->poll_frame)
354 return link->srcpad->poll_frame(link);
356 for (i = 0; i < link->src->input_count; i++) {
358 if (!link->src->inputs[i])
360 val = avfilter_poll_frame(link->src->inputs[i]);
361 min = FFMIN(min, val);
367 /* XXX: should we do the duplicating of the picture ref here, instead of
368 * forcing the source filter to do it? */
369 void avfilter_start_frame(AVFilterLink *link, AVFilterBufferRef *picref)
371 void (*start_frame)(AVFilterLink *, AVFilterBufferRef *);
372 AVFilterPad *dst = link->dstpad;
373 int perms = picref->perms;
375 FF_DPRINTF_START(NULL, start_frame); ff_dprintf_link(NULL, link, 0); dprintf(NULL, " "); ff_dprintf_ref(NULL, picref, 1);
377 if (!(start_frame = dst->start_frame))
378 start_frame = avfilter_default_start_frame;
380 if (picref->linesize[0] < 0)
381 perms |= AV_PERM_NEG_LINESIZES;
382 /* prepare to copy the picture if it has insufficient permissions */
383 if ((dst->min_perms & perms) != dst->min_perms || dst->rej_perms & perms) {
384 av_log(link->dst, AV_LOG_DEBUG,
385 "frame copy needed (have perms %x, need %x, reject %x)\n",
387 link->dstpad->min_perms, link->dstpad->rej_perms);
389 link->cur_buf = avfilter_get_video_buffer(link, dst->min_perms, link->w, link->h);
390 link->src_buf = picref;
391 avfilter_copy_buffer_ref_props(link->cur_buf, link->src_buf);
394 link->cur_buf = picref;
396 start_frame(link, link->cur_buf);
399 void avfilter_end_frame(AVFilterLink *link)
401 void (*end_frame)(AVFilterLink *);
403 if (!(end_frame = link->dstpad->end_frame))
404 end_frame = avfilter_default_end_frame;
408 /* unreference the source picture if we're feeding the destination filter
409 * a copied version dues to permission issues */
411 avfilter_unref_buffer(link->src_buf);
412 link->src_buf = NULL;
416 void avfilter_draw_slice(AVFilterLink *link, int y, int h, int slice_dir)
418 uint8_t *src[4], *dst[4];
420 void (*draw_slice)(AVFilterLink *, int, int, int);
422 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);
424 /* copy the slice if needed for permission reasons */
426 vsub = av_pix_fmt_descriptors[link->format].log2_chroma_h;
428 for (i = 0; i < 4; i++) {
429 if (link->src_buf->data[i]) {
430 src[i] = link->src_buf-> data[i] +
431 (y >> (i==1 || i==2 ? vsub : 0)) * link->src_buf-> linesize[i];
432 dst[i] = link->cur_buf->data[i] +
433 (y >> (i==1 || i==2 ? vsub : 0)) * link->cur_buf->linesize[i];
435 src[i] = dst[i] = NULL;
438 for (i = 0; i < 4; i++) {
440 av_image_get_linesize(link->format, link->cur_buf->video->w, i);
442 if (!src[i]) continue;
444 for (j = 0; j < h >> (i==1 || i==2 ? vsub : 0); j++) {
445 memcpy(dst[i], src[i], planew);
446 src[i] += link->src_buf->linesize[i];
447 dst[i] += link->cur_buf->linesize[i];
452 if (!(draw_slice = link->dstpad->draw_slice))
453 draw_slice = avfilter_default_draw_slice;
454 draw_slice(link, y, h, slice_dir);
457 void avfilter_filter_samples(AVFilterLink *link, AVFilterBufferRef *samplesref)
459 void (*filter_samples)(AVFilterLink *, AVFilterBufferRef *);
460 AVFilterPad *dst = link->dstpad;
462 if (!(filter_samples = dst->filter_samples))
463 filter_samples = avfilter_default_filter_samples;
465 /* prepare to copy the samples if the buffer has insufficient permissions */
466 if ((dst->min_perms & samplesref->perms) != dst->min_perms ||
467 dst->rej_perms & samplesref->perms) {
469 av_log(link->dst, AV_LOG_DEBUG,
470 "Copying audio data in avfilter (have perms %x, need %x, reject %x)\n",
471 samplesref->perms, link->dstpad->min_perms, link->dstpad->rej_perms);
473 link->cur_buf = avfilter_default_get_audio_buffer(link, dst->min_perms,
475 samplesref->audio->size,
476 samplesref->audio->channel_layout,
477 samplesref->audio->planar);
478 link->cur_buf->pts = samplesref->pts;
479 link->cur_buf->audio->sample_rate = samplesref->audio->sample_rate;
481 /* Copy actual data into new samples buffer */
482 memcpy(link->cur_buf->data[0], samplesref->data[0], samplesref->audio->size);
484 avfilter_unref_buffer(samplesref);
486 link->cur_buf = samplesref;
488 filter_samples(link, link->cur_buf);
491 #define MAX_REGISTERED_AVFILTERS_NB 64
493 static AVFilter *registered_avfilters[MAX_REGISTERED_AVFILTERS_NB + 1];
495 static int next_registered_avfilter_idx = 0;
497 AVFilter *avfilter_get_by_name(const char *name)
501 for (i = 0; registered_avfilters[i]; i++)
502 if (!strcmp(registered_avfilters[i]->name, name))
503 return registered_avfilters[i];
508 int avfilter_register(AVFilter *filter)
510 if (next_registered_avfilter_idx == MAX_REGISTERED_AVFILTERS_NB)
513 registered_avfilters[next_registered_avfilter_idx++] = filter;
517 AVFilter **av_filter_next(AVFilter **filter)
519 return filter ? ++filter : ®istered_avfilters[0];
522 void avfilter_uninit(void)
524 memset(registered_avfilters, 0, sizeof(registered_avfilters));
525 next_registered_avfilter_idx = 0;
528 static int pad_count(const AVFilterPad *pads)
532 for(count = 0; pads->name; count ++) pads ++;
536 static const char *filter_name(void *p)
538 AVFilterContext *filter = p;
539 return filter->filter->name;
542 static const AVClass avfilter_class = {
546 LIBAVUTIL_VERSION_INT,
549 int avfilter_open(AVFilterContext **filter_ctx, AVFilter *filter, const char *inst_name)
551 AVFilterContext *ret;
555 return AVERROR(EINVAL);
557 ret = av_mallocz(sizeof(AVFilterContext));
559 ret->av_class = &avfilter_class;
560 ret->filter = filter;
561 ret->name = inst_name ? av_strdup(inst_name) : NULL;
562 ret->priv = av_mallocz(filter->priv_size);
564 ret->input_count = pad_count(filter->inputs);
565 if (ret->input_count) {
566 ret->input_pads = av_malloc(sizeof(AVFilterPad) * ret->input_count);
567 memcpy(ret->input_pads, filter->inputs, sizeof(AVFilterPad) * ret->input_count);
568 ret->inputs = av_mallocz(sizeof(AVFilterLink*) * ret->input_count);
571 ret->output_count = pad_count(filter->outputs);
572 if (ret->output_count) {
573 ret->output_pads = av_malloc(sizeof(AVFilterPad) * ret->output_count);
574 memcpy(ret->output_pads, filter->outputs, sizeof(AVFilterPad) * ret->output_count);
575 ret->outputs = av_mallocz(sizeof(AVFilterLink*) * ret->output_count);
582 void avfilter_free(AVFilterContext *filter)
587 if (filter->filter->uninit)
588 filter->filter->uninit(filter);
590 for (i = 0; i < filter->input_count; i++) {
591 if ((link = filter->inputs[i])) {
593 link->src->outputs[link->srcpad - link->src->output_pads] = NULL;
594 avfilter_formats_unref(&link->in_formats);
595 avfilter_formats_unref(&link->out_formats);
599 for (i = 0; i < filter->output_count; i++) {
600 if ((link = filter->outputs[i])) {
602 link->dst->inputs[link->dstpad - link->dst->input_pads] = NULL;
603 avfilter_formats_unref(&link->in_formats);
604 avfilter_formats_unref(&link->out_formats);
609 av_freep(&filter->name);
610 av_freep(&filter->input_pads);
611 av_freep(&filter->output_pads);
612 av_freep(&filter->inputs);
613 av_freep(&filter->outputs);
614 av_freep(&filter->priv);
618 int avfilter_init_filter(AVFilterContext *filter, const char *args, void *opaque)
622 if (filter->filter->init)
623 ret = filter->filter->init(filter, args, opaque);