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/pixdesc.h"
25 #include "libavutil/rational.h"
26 #include "libavutil/audioconvert.h"
27 #include "libavutil/imgutils.h"
28 #include "libavcodec/avcodec.h"
32 unsigned avfilter_version(void) {
33 return LIBAVFILTER_VERSION_INT;
36 const char *avfilter_configuration(void)
38 return LIBAV_CONFIGURATION;
41 const char *avfilter_license(void)
43 #define LICENSE_PREFIX "libavfilter license: "
44 return LICENSE_PREFIX LIBAV_LICENSE + sizeof(LICENSE_PREFIX) - 1;
47 AVFilterBufferRef *avfilter_ref_buffer(AVFilterBufferRef *ref, int pmask)
49 AVFilterBufferRef *ret = av_malloc(sizeof(AVFilterBufferRef));
53 if (ref->type == AVMEDIA_TYPE_VIDEO) {
54 ret->video = av_malloc(sizeof(AVFilterBufferRefVideoProps));
59 *ret->video = *ref->video;
60 } else if (ref->type == AVMEDIA_TYPE_AUDIO) {
61 ret->audio = av_malloc(sizeof(AVFilterBufferRefAudioProps));
66 *ret->audio = *ref->audio;
69 ret->buf->refcount ++;
73 void avfilter_unref_buffer(AVFilterBufferRef *ref)
77 if (!(--ref->buf->refcount))
78 ref->buf->free(ref->buf);
84 void avfilter_insert_pad(unsigned idx, unsigned *count, size_t padidx_off,
85 AVFilterPad **pads, AVFilterLink ***links,
90 idx = FFMIN(idx, *count);
92 *pads = av_realloc(*pads, sizeof(AVFilterPad) * (*count + 1));
93 *links = av_realloc(*links, sizeof(AVFilterLink*) * (*count + 1));
94 memmove(*pads +idx+1, *pads +idx, sizeof(AVFilterPad) * (*count-idx));
95 memmove(*links+idx+1, *links+idx, sizeof(AVFilterLink*) * (*count-idx));
96 memcpy(*pads+idx, newpad, sizeof(AVFilterPad));
100 for (i = idx+1; i < *count; i++)
102 (*(unsigned *)((uint8_t *) *links[i] + padidx_off))++;
105 int avfilter_link(AVFilterContext *src, unsigned srcpad,
106 AVFilterContext *dst, unsigned dstpad)
110 if (src->output_count <= srcpad || dst->input_count <= dstpad ||
111 src->outputs[srcpad] || dst->inputs[dstpad])
114 if (src->output_pads[srcpad].type != dst->input_pads[dstpad].type) {
115 av_log(src, AV_LOG_ERROR,
116 "Media type mismatch between the '%s' filter output pad %d and the '%s' filter input pad %d\n",
117 src->name, srcpad, dst->name, dstpad);
118 return AVERROR(EINVAL);
121 src->outputs[srcpad] =
122 dst-> inputs[dstpad] = link = av_mallocz(sizeof(AVFilterLink));
126 link->srcpad = &src->output_pads[srcpad];
127 link->dstpad = &dst->input_pads[dstpad];
128 link->type = src->output_pads[srcpad].type;
129 assert(PIX_FMT_NONE == -1 && AV_SAMPLE_FMT_NONE == -1);
135 int avfilter_insert_filter(AVFilterLink *link, AVFilterContext *filt,
136 unsigned filt_srcpad_idx, unsigned filt_dstpad_idx)
139 unsigned dstpad_idx = link->dstpad - link->dst->input_pads;
141 av_log(link->dst, AV_LOG_INFO, "auto-inserting filter '%s' "
142 "between the filter '%s' and the filter '%s'\n",
143 filt->name, link->src->name, link->dst->name);
145 link->dst->inputs[dstpad_idx] = NULL;
146 if ((ret = avfilter_link(filt, filt_dstpad_idx, link->dst, dstpad_idx)) < 0) {
147 /* failed to link output filter to new filter */
148 link->dst->inputs[dstpad_idx] = link;
152 /* re-hookup the link to the new destination filter we inserted */
154 link->dstpad = &filt->input_pads[filt_srcpad_idx];
155 filt->inputs[filt_srcpad_idx] = link;
157 /* if any information on supported media formats already exists on the
158 * link, we need to preserve that */
159 if (link->out_formats)
160 avfilter_formats_changeref(&link->out_formats,
161 &filt->outputs[filt_dstpad_idx]->out_formats);
166 int avfilter_config_links(AVFilterContext *filter)
168 int (*config_link)(AVFilterLink *);
172 for (i = 0; i < filter->input_count; i ++) {
173 AVFilterLink *link = filter->inputs[i];
177 switch (link->init_state) {
180 case AVLINK_STARTINIT:
181 av_log(filter, AV_LOG_INFO, "circular filter chain detected\n");
184 link->init_state = AVLINK_STARTINIT;
186 if ((ret = avfilter_config_links(link->src)) < 0)
189 if (!(config_link = link->srcpad->config_props))
190 config_link = avfilter_default_config_output_link;
191 if ((ret = config_link(link)) < 0)
194 if (link->time_base.num == 0 && link->time_base.den == 0)
195 link->time_base = link->src && link->src->input_count ?
196 link->src->inputs[0]->time_base : AV_TIME_BASE_Q;
198 if (link->sample_aspect_ratio.num == 0 && link->sample_aspect_ratio.den == 0)
199 link->sample_aspect_ratio = link->src->input_count ?
200 link->src->inputs[0]->sample_aspect_ratio : (AVRational){1,1};
202 if (link->sample_rate == 0 && link->src && link->src->input_count)
203 link->sample_rate = link->src->inputs[0]->sample_rate;
205 if (link->channel_layout == 0 && link->src && link->src->input_count)
206 link->channel_layout = link->src->inputs[0]->channel_layout;
208 if ((config_link = link->dstpad->config_props))
209 if ((ret = config_link(link)) < 0)
212 link->init_state = AVLINK_INIT;
220 static char *ff_get_ref_perms_string(char *buf, size_t buf_size, int perms)
222 snprintf(buf, buf_size, "%s%s%s%s%s%s",
223 perms & AV_PERM_READ ? "r" : "",
224 perms & AV_PERM_WRITE ? "w" : "",
225 perms & AV_PERM_PRESERVE ? "p" : "",
226 perms & AV_PERM_REUSE ? "u" : "",
227 perms & AV_PERM_REUSE2 ? "U" : "",
228 perms & AV_PERM_NEG_LINESIZES ? "n" : "");
233 static void ff_dlog_ref(void *ctx, AVFilterBufferRef *ref, int end)
235 av_unused char buf[16];
237 "ref[%p buf:%p refcount:%d perms:%s data:%p linesize[%d, %d, %d, %d] pts:%"PRId64" pos:%"PRId64,
238 ref, ref->buf, ref->buf->refcount, ff_get_ref_perms_string(buf, sizeof(buf), ref->perms), ref->data[0],
239 ref->linesize[0], ref->linesize[1], ref->linesize[2], ref->linesize[3],
243 av_dlog(ctx, " a:%d/%d s:%dx%d i:%c iskey:%d type:%c",
244 ref->video->pixel_aspect.num, ref->video->pixel_aspect.den,
245 ref->video->w, ref->video->h,
246 !ref->video->interlaced ? 'P' : /* Progressive */
247 ref->video->top_field_first ? 'T' : 'B', /* Top / Bottom */
248 ref->video->key_frame,
249 av_get_picture_type_char(ref->video->pict_type));
252 av_dlog(ctx, " cl:%"PRId64"d sn:%d s:%d sr:%d p:%d",
253 ref->audio->channel_layout,
254 ref->audio->nb_samples,
256 ref->audio->sample_rate,
260 av_dlog(ctx, "]%s", end ? "\n" : "");
263 static void ff_dlog_link(void *ctx, AVFilterLink *link, int end)
265 if (link->type == AVMEDIA_TYPE_VIDEO) {
267 "link[%p s:%dx%d fmt:%-16s %-16s->%-16s]%s",
268 link, link->w, link->h,
269 av_pix_fmt_descriptors[link->format].name,
270 link->src ? link->src->filter->name : "",
271 link->dst ? link->dst->filter->name : "",
275 av_get_channel_layout_string(buf, sizeof(buf), -1, link->channel_layout);
278 "link[%p r:%"PRId64" cl:%s fmt:%-16s %-16s->%-16s]%s",
279 link, link->sample_rate, buf,
280 av_get_sample_fmt_name(link->format),
281 link->src ? link->src->filter->name : "",
282 link->dst ? link->dst->filter->name : "",
287 #define FF_DPRINTF_START(ctx, func) av_dlog(NULL, "%-16s: ", #func)
289 AVFilterBufferRef *avfilter_get_video_buffer(AVFilterLink *link, int perms, int w, int h)
291 AVFilterBufferRef *ret = NULL;
293 av_unused char buf[16];
294 FF_DPRINTF_START(NULL, get_video_buffer); ff_dlog_link(NULL, link, 0);
295 av_dlog(NULL, " perms:%s w:%d h:%d\n", ff_get_ref_perms_string(buf, sizeof(buf), perms), w, h);
297 if (link->dstpad->get_video_buffer)
298 ret = link->dstpad->get_video_buffer(link, perms, w, h);
301 ret = avfilter_default_get_video_buffer(link, perms, w, h);
304 ret->type = AVMEDIA_TYPE_VIDEO;
306 FF_DPRINTF_START(NULL, get_video_buffer); ff_dlog_link(NULL, link, 0); av_dlog(NULL, " returning "); ff_dlog_ref(NULL, ret, 1);
312 avfilter_get_video_buffer_ref_from_arrays(uint8_t *data[4], int linesize[4], int perms,
313 int w, int h, enum PixelFormat format)
315 AVFilterBuffer *pic = av_mallocz(sizeof(AVFilterBuffer));
316 AVFilterBufferRef *picref = av_mallocz(sizeof(AVFilterBufferRef));
322 picref->buf->free = ff_avfilter_default_free_buffer;
323 if (!(picref->video = av_mallocz(sizeof(AVFilterBufferRefVideoProps))))
326 pic->w = picref->video->w = w;
327 pic->h = picref->video->h = h;
329 /* make sure the buffer gets read permission or it's useless for output */
330 picref->perms = perms | AV_PERM_READ;
333 picref->type = AVMEDIA_TYPE_VIDEO;
334 pic->format = picref->format = format;
336 memcpy(pic->data, data, 4*sizeof(data[0]));
337 memcpy(pic->linesize, linesize, 4*sizeof(linesize[0]));
338 memcpy(picref->data, pic->data, sizeof(picref->data));
339 memcpy(picref->linesize, pic->linesize, sizeof(picref->linesize));
344 if (picref && picref->video)
345 av_free(picref->video);
351 AVFilterBufferRef *avfilter_get_audio_buffer(AVFilterLink *link, int perms,
352 enum AVSampleFormat sample_fmt, int size,
353 uint64_t channel_layout, int planar)
355 AVFilterBufferRef *ret = NULL;
357 if (link->dstpad->get_audio_buffer)
358 ret = link->dstpad->get_audio_buffer(link, perms, sample_fmt, size, channel_layout, planar);
361 ret = avfilter_default_get_audio_buffer(link, perms, sample_fmt, size, channel_layout, planar);
364 ret->type = AVMEDIA_TYPE_AUDIO;
369 int avfilter_request_frame(AVFilterLink *link)
371 FF_DPRINTF_START(NULL, request_frame); ff_dlog_link(NULL, link, 1);
373 if (link->srcpad->request_frame)
374 return link->srcpad->request_frame(link);
375 else if (link->src->inputs[0])
376 return avfilter_request_frame(link->src->inputs[0]);
380 int avfilter_poll_frame(AVFilterLink *link)
382 int i, min = INT_MAX;
384 if (link->srcpad->poll_frame)
385 return link->srcpad->poll_frame(link);
387 for (i = 0; i < link->src->input_count; i++) {
389 if (!link->src->inputs[i])
391 val = avfilter_poll_frame(link->src->inputs[i]);
392 min = FFMIN(min, val);
398 /* XXX: should we do the duplicating of the picture ref here, instead of
399 * forcing the source filter to do it? */
400 void avfilter_start_frame(AVFilterLink *link, AVFilterBufferRef *picref)
402 void (*start_frame)(AVFilterLink *, AVFilterBufferRef *);
403 AVFilterPad *dst = link->dstpad;
404 int perms = picref->perms;
406 FF_DPRINTF_START(NULL, start_frame); ff_dlog_link(NULL, link, 0); av_dlog(NULL, " "); ff_dlog_ref(NULL, picref, 1);
408 if (!(start_frame = dst->start_frame))
409 start_frame = avfilter_default_start_frame;
411 if (picref->linesize[0] < 0)
412 perms |= AV_PERM_NEG_LINESIZES;
413 /* prepare to copy the picture if it has insufficient permissions */
414 if ((dst->min_perms & perms) != dst->min_perms || dst->rej_perms & perms) {
415 av_log(link->dst, AV_LOG_DEBUG,
416 "frame copy needed (have perms %x, need %x, reject %x)\n",
418 link->dstpad->min_perms, link->dstpad->rej_perms);
420 link->cur_buf = avfilter_get_video_buffer(link, dst->min_perms, link->w, link->h);
421 link->src_buf = picref;
422 avfilter_copy_buffer_ref_props(link->cur_buf, link->src_buf);
425 link->cur_buf = picref;
427 start_frame(link, link->cur_buf);
430 void avfilter_end_frame(AVFilterLink *link)
432 void (*end_frame)(AVFilterLink *);
434 if (!(end_frame = link->dstpad->end_frame))
435 end_frame = avfilter_default_end_frame;
439 /* unreference the source picture if we're feeding the destination filter
440 * a copied version dues to permission issues */
442 avfilter_unref_buffer(link->src_buf);
443 link->src_buf = NULL;
447 void avfilter_draw_slice(AVFilterLink *link, int y, int h, int slice_dir)
449 uint8_t *src[4], *dst[4];
451 void (*draw_slice)(AVFilterLink *, int, int, int);
453 FF_DPRINTF_START(NULL, draw_slice); ff_dlog_link(NULL, link, 0); av_dlog(NULL, " y:%d h:%d dir:%d\n", y, h, slice_dir);
455 /* copy the slice if needed for permission reasons */
457 vsub = av_pix_fmt_descriptors[link->format].log2_chroma_h;
459 for (i = 0; i < 4; i++) {
460 if (link->src_buf->data[i]) {
461 src[i] = link->src_buf-> data[i] +
462 (y >> (i==1 || i==2 ? vsub : 0)) * link->src_buf-> linesize[i];
463 dst[i] = link->cur_buf->data[i] +
464 (y >> (i==1 || i==2 ? vsub : 0)) * link->cur_buf->linesize[i];
466 src[i] = dst[i] = NULL;
469 for (i = 0; i < 4; i++) {
471 av_image_get_linesize(link->format, link->cur_buf->video->w, i);
473 if (!src[i]) continue;
475 for (j = 0; j < h >> (i==1 || i==2 ? vsub : 0); j++) {
476 memcpy(dst[i], src[i], planew);
477 src[i] += link->src_buf->linesize[i];
478 dst[i] += link->cur_buf->linesize[i];
483 if (!(draw_slice = link->dstpad->draw_slice))
484 draw_slice = avfilter_default_draw_slice;
485 draw_slice(link, y, h, slice_dir);
488 void avfilter_filter_samples(AVFilterLink *link, AVFilterBufferRef *samplesref)
490 void (*filter_samples)(AVFilterLink *, AVFilterBufferRef *);
491 AVFilterPad *dst = link->dstpad;
493 FF_DPRINTF_START(NULL, filter_samples); ff_dlog_link(NULL, link, 1);
495 if (!(filter_samples = dst->filter_samples))
496 filter_samples = avfilter_default_filter_samples;
498 /* prepare to copy the samples if the buffer has insufficient permissions */
499 if ((dst->min_perms & samplesref->perms) != dst->min_perms ||
500 dst->rej_perms & samplesref->perms) {
502 av_log(link->dst, AV_LOG_DEBUG,
503 "Copying audio data in avfilter (have perms %x, need %x, reject %x)\n",
504 samplesref->perms, link->dstpad->min_perms, link->dstpad->rej_perms);
506 link->cur_buf = avfilter_default_get_audio_buffer(link, dst->min_perms,
508 samplesref->audio->size,
509 samplesref->audio->channel_layout,
510 samplesref->audio->planar);
511 link->cur_buf->pts = samplesref->pts;
512 link->cur_buf->audio->sample_rate = samplesref->audio->sample_rate;
514 /* Copy actual data into new samples buffer */
515 memcpy(link->cur_buf->data[0], samplesref->data[0], samplesref->audio->size);
517 avfilter_unref_buffer(samplesref);
519 link->cur_buf = samplesref;
521 filter_samples(link, link->cur_buf);
524 #define MAX_REGISTERED_AVFILTERS_NB 64
526 static AVFilter *registered_avfilters[MAX_REGISTERED_AVFILTERS_NB + 1];
528 static int next_registered_avfilter_idx = 0;
530 AVFilter *avfilter_get_by_name(const char *name)
534 for (i = 0; registered_avfilters[i]; i++)
535 if (!strcmp(registered_avfilters[i]->name, name))
536 return registered_avfilters[i];
541 int avfilter_register(AVFilter *filter)
543 if (next_registered_avfilter_idx == MAX_REGISTERED_AVFILTERS_NB)
546 registered_avfilters[next_registered_avfilter_idx++] = filter;
550 AVFilter **av_filter_next(AVFilter **filter)
552 return filter ? ++filter : ®istered_avfilters[0];
555 void avfilter_uninit(void)
557 memset(registered_avfilters, 0, sizeof(registered_avfilters));
558 next_registered_avfilter_idx = 0;
561 static int pad_count(const AVFilterPad *pads)
565 for(count = 0; pads->name; count ++) pads ++;
569 static const char *filter_name(void *p)
571 AVFilterContext *filter = p;
572 return filter->filter->name;
575 static const AVClass avfilter_class = {
579 LIBAVUTIL_VERSION_INT,
582 int avfilter_open(AVFilterContext **filter_ctx, AVFilter *filter, const char *inst_name)
584 AVFilterContext *ret;
588 return AVERROR(EINVAL);
590 ret = av_mallocz(sizeof(AVFilterContext));
592 return AVERROR(ENOMEM);
594 ret->av_class = &avfilter_class;
595 ret->filter = filter;
596 ret->name = inst_name ? av_strdup(inst_name) : NULL;
597 if (filter->priv_size) {
598 ret->priv = av_mallocz(filter->priv_size);
603 ret->input_count = pad_count(filter->inputs);
604 if (ret->input_count) {
605 ret->input_pads = av_malloc(sizeof(AVFilterPad) * ret->input_count);
606 if (!ret->input_pads)
608 memcpy(ret->input_pads, filter->inputs, sizeof(AVFilterPad) * ret->input_count);
609 ret->inputs = av_mallocz(sizeof(AVFilterLink*) * ret->input_count);
614 ret->output_count = pad_count(filter->outputs);
615 if (ret->output_count) {
616 ret->output_pads = av_malloc(sizeof(AVFilterPad) * ret->output_count);
617 if (!ret->output_pads)
619 memcpy(ret->output_pads, filter->outputs, sizeof(AVFilterPad) * ret->output_count);
620 ret->outputs = av_mallocz(sizeof(AVFilterLink*) * ret->output_count);
629 av_freep(&ret->inputs);
630 av_freep(&ret->input_pads);
631 ret->input_count = 0;
632 av_freep(&ret->outputs);
633 av_freep(&ret->output_pads);
634 ret->output_count = 0;
635 av_freep(&ret->priv);
637 return AVERROR(ENOMEM);
640 void avfilter_free(AVFilterContext *filter)
645 if (filter->filter->uninit)
646 filter->filter->uninit(filter);
648 for (i = 0; i < filter->input_count; i++) {
649 if ((link = filter->inputs[i])) {
651 link->src->outputs[link->srcpad - link->src->output_pads] = NULL;
652 avfilter_formats_unref(&link->in_formats);
653 avfilter_formats_unref(&link->out_formats);
657 for (i = 0; i < filter->output_count; i++) {
658 if ((link = filter->outputs[i])) {
660 link->dst->inputs[link->dstpad - link->dst->input_pads] = NULL;
661 avfilter_formats_unref(&link->in_formats);
662 avfilter_formats_unref(&link->out_formats);
667 av_freep(&filter->name);
668 av_freep(&filter->input_pads);
669 av_freep(&filter->output_pads);
670 av_freep(&filter->inputs);
671 av_freep(&filter->outputs);
672 av_freep(&filter->priv);
676 int avfilter_init_filter(AVFilterContext *filter, const char *args, void *opaque)
680 if (filter->filter->init)
681 ret = filter->filter->init(filter, args, opaque);
685 int avfilter_copy_frame_props(AVFilterBufferRef *dst, const AVFrame *src)
687 if (dst->type != AVMEDIA_TYPE_VIDEO)
688 return AVERROR(EINVAL);
691 dst->format = src->format;
693 dst->video->w = src->width;
694 dst->video->h = src->height;
695 dst->video->pixel_aspect = src->sample_aspect_ratio;
696 dst->video->interlaced = src->interlaced_frame;
697 dst->video->top_field_first = src->top_field_first;
698 dst->video->key_frame = src->key_frame;
699 dst->video->pict_type = src->pict_type;