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 if (src->output_pads[srcpad].type != dst->input_pads[dstpad].type) {
111 av_log(src, AV_LOG_ERROR,
112 "Media type mismatch between the '%s' filter output pad %d and the '%s' filter input pad %d\n",
113 src->name, srcpad, dst->name, dstpad);
114 return AVERROR(EINVAL);
117 src->outputs[srcpad] =
118 dst-> inputs[dstpad] = link = av_mallocz(sizeof(AVFilterLink));
122 link->srcpad = &src->output_pads[srcpad];
123 link->dstpad = &dst->input_pads[dstpad];
124 link->type = src->output_pads[srcpad].type;
125 assert(PIX_FMT_NONE == -1 && AV_SAMPLE_FMT_NONE == -1);
131 int avfilter_insert_filter(AVFilterLink *link, AVFilterContext *filt,
132 unsigned filt_srcpad_idx, unsigned filt_dstpad_idx)
135 unsigned dstpad_idx = link->dstpad - link->dst->input_pads;
137 av_log(link->dst, AV_LOG_INFO, "auto-inserting filter '%s' "
138 "between the filter '%s' and the filter '%s'\n",
139 filt->name, link->src->name, link->dst->name);
141 link->dst->inputs[dstpad_idx] = NULL;
142 if ((ret = avfilter_link(filt, filt_dstpad_idx, link->dst, dstpad_idx)) < 0) {
143 /* failed to link output filter to new filter */
144 link->dst->inputs[dstpad_idx] = link;
148 /* re-hookup the link to the new destination filter we inserted */
150 link->dstpad = &filt->input_pads[filt_srcpad_idx];
151 filt->inputs[filt_srcpad_idx] = link;
153 /* if any information on supported media formats already exists on the
154 * link, we need to preserve that */
155 if (link->out_formats)
156 avfilter_formats_changeref(&link->out_formats,
157 &filt->outputs[filt_dstpad_idx]->out_formats);
162 int avfilter_config_links(AVFilterContext *filter)
164 int (*config_link)(AVFilterLink *);
168 for (i = 0; i < filter->input_count; i ++) {
169 AVFilterLink *link = filter->inputs[i];
173 switch (link->init_state) {
176 case AVLINK_STARTINIT:
177 av_log(filter, AV_LOG_INFO, "circular filter chain detected\n");
180 link->init_state = AVLINK_STARTINIT;
182 if ((ret = avfilter_config_links(link->src)) < 0)
185 if (!(config_link = link->srcpad->config_props))
186 config_link = avfilter_default_config_output_link;
187 if ((ret = config_link(link)) < 0)
190 if (link->time_base.num == 0 && link->time_base.den == 0)
191 link->time_base = link->src && link->src->input_count ?
192 link->src->inputs[0]->time_base : AV_TIME_BASE_Q;
194 if ((config_link = link->dstpad->config_props))
195 if ((ret = config_link(link)) < 0)
198 link->init_state = AVLINK_INIT;
205 char *ff_get_ref_perms_string(char *buf, size_t buf_size, int perms)
207 snprintf(buf, buf_size, "%s%s%s%s%s%s",
208 perms & AV_PERM_READ ? "r" : "",
209 perms & AV_PERM_WRITE ? "w" : "",
210 perms & AV_PERM_PRESERVE ? "p" : "",
211 perms & AV_PERM_REUSE ? "u" : "",
212 perms & AV_PERM_REUSE2 ? "U" : "",
213 perms & AV_PERM_NEG_LINESIZES ? "n" : "");
217 void ff_dprintf_ref(void *ctx, AVFilterBufferRef *ref, int end)
219 av_unused char buf[16];
221 "ref[%p buf:%p refcount:%d perms:%s data:%p linesize[%d, %d, %d, %d] pts:%"PRId64" pos:%"PRId64,
222 ref, ref->buf, ref->buf->refcount, ff_get_ref_perms_string(buf, sizeof(buf), ref->perms), ref->data[0],
223 ref->linesize[0], ref->linesize[1], ref->linesize[2], ref->linesize[3],
227 dprintf(ctx, " a:%d/%d s:%dx%d i:%c",
228 ref->video->pixel_aspect.num, ref->video->pixel_aspect.den,
229 ref->video->w, ref->video->h,
230 !ref->video->interlaced ? 'P' : /* Progressive */
231 ref->video->top_field_first ? 'T' : 'B'); /* Top / Bottom */
234 dprintf(ctx, " cl:%"PRId64"d sn:%d s:%d sr:%d p:%d",
235 ref->audio->channel_layout,
236 ref->audio->samples_nb,
238 ref->audio->sample_rate,
242 dprintf(ctx, "]%s", end ? "\n" : "");
245 void ff_dprintf_link(void *ctx, AVFilterLink *link, int end)
248 "link[%p s:%dx%d fmt:%-16s %-16s->%-16s]%s",
249 link, link->w, link->h,
250 av_pix_fmt_descriptors[link->format].name,
251 link->src ? link->src->filter->name : "",
252 link->dst ? link->dst->filter->name : "",
256 AVFilterBufferRef *avfilter_get_video_buffer(AVFilterLink *link, int perms, int w, int h)
258 AVFilterBufferRef *ret = NULL;
260 av_unused char buf[16];
261 FF_DPRINTF_START(NULL, get_video_buffer); ff_dprintf_link(NULL, link, 0);
262 dprintf(NULL, " perms:%s w:%d h:%d\n", ff_get_ref_perms_string(buf, sizeof(buf), perms), w, h);
264 if (link->dstpad->get_video_buffer)
265 ret = link->dstpad->get_video_buffer(link, perms, w, h);
268 ret = avfilter_default_get_video_buffer(link, perms, w, h);
271 ret->type = AVMEDIA_TYPE_VIDEO;
273 FF_DPRINTF_START(NULL, get_video_buffer); ff_dprintf_link(NULL, link, 0); dprintf(NULL, " returning "); ff_dprintf_ref(NULL, ret, 1);
279 avfilter_get_video_buffer_ref_from_arrays(uint8_t *data[4], int linesize[4], int perms,
280 int w, int h, enum PixelFormat format)
282 AVFilterBuffer *pic = av_mallocz(sizeof(AVFilterBuffer));
283 AVFilterBufferRef *picref = av_mallocz(sizeof(AVFilterBufferRef));
289 picref->buf->free = ff_avfilter_default_free_buffer;
290 if (!(picref->video = av_mallocz(sizeof(AVFilterBufferRefVideoProps))))
293 pic->w = picref->video->w = w;
294 pic->h = picref->video->h = h;
296 /* make sure the buffer gets read permission or it's useless for output */
297 picref->perms = perms | AV_PERM_READ;
300 picref->type = AVMEDIA_TYPE_VIDEO;
301 pic->format = picref->format = format;
303 memcpy(pic->data, data, sizeof(pic->data));
304 memcpy(pic->linesize, linesize, sizeof(pic->linesize));
305 memcpy(picref->data, pic->data, sizeof(picref->data));
306 memcpy(picref->linesize, pic->linesize, sizeof(picref->linesize));
311 if (picref && picref->video)
312 av_free(picref->video);
318 AVFilterBufferRef *avfilter_get_audio_buffer(AVFilterLink *link, int perms,
319 enum AVSampleFormat sample_fmt, int size,
320 int64_t channel_layout, int planar)
322 AVFilterBufferRef *ret = NULL;
324 if (link->dstpad->get_audio_buffer)
325 ret = link->dstpad->get_audio_buffer(link, perms, sample_fmt, size, channel_layout, planar);
328 ret = avfilter_default_get_audio_buffer(link, perms, sample_fmt, size, channel_layout, planar);
331 ret->type = AVMEDIA_TYPE_AUDIO;
336 int avfilter_request_frame(AVFilterLink *link)
338 FF_DPRINTF_START(NULL, request_frame); ff_dprintf_link(NULL, link, 1);
340 if (link->srcpad->request_frame)
341 return link->srcpad->request_frame(link);
342 else if (link->src->inputs[0])
343 return avfilter_request_frame(link->src->inputs[0]);
347 int avfilter_poll_frame(AVFilterLink *link)
349 int i, min = INT_MAX;
351 if (link->srcpad->poll_frame)
352 return link->srcpad->poll_frame(link);
354 for (i = 0; i < link->src->input_count; i++) {
356 if (!link->src->inputs[i])
358 val = avfilter_poll_frame(link->src->inputs[i]);
359 min = FFMIN(min, val);
365 /* XXX: should we do the duplicating of the picture ref here, instead of
366 * forcing the source filter to do it? */
367 void avfilter_start_frame(AVFilterLink *link, AVFilterBufferRef *picref)
369 void (*start_frame)(AVFilterLink *, AVFilterBufferRef *);
370 AVFilterPad *dst = link->dstpad;
371 int perms = picref->perms;
373 FF_DPRINTF_START(NULL, start_frame); ff_dprintf_link(NULL, link, 0); dprintf(NULL, " "); ff_dprintf_ref(NULL, picref, 1);
375 if (!(start_frame = dst->start_frame))
376 start_frame = avfilter_default_start_frame;
378 if (picref->linesize[0] < 0)
379 perms |= AV_PERM_NEG_LINESIZES;
380 /* prepare to copy the picture if it has insufficient permissions */
381 if ((dst->min_perms & perms) != dst->min_perms || dst->rej_perms & perms) {
382 av_log(link->dst, AV_LOG_DEBUG,
383 "frame copy needed (have perms %x, need %x, reject %x)\n",
385 link->dstpad->min_perms, link->dstpad->rej_perms);
387 link->cur_buf = avfilter_get_video_buffer(link, dst->min_perms, link->w, link->h);
388 link->src_buf = picref;
389 avfilter_copy_buffer_ref_props(link->cur_buf, link->src_buf);
392 link->cur_buf = picref;
394 start_frame(link, link->cur_buf);
397 void avfilter_end_frame(AVFilterLink *link)
399 void (*end_frame)(AVFilterLink *);
401 if (!(end_frame = link->dstpad->end_frame))
402 end_frame = avfilter_default_end_frame;
406 /* unreference the source picture if we're feeding the destination filter
407 * a copied version dues to permission issues */
409 avfilter_unref_buffer(link->src_buf);
410 link->src_buf = NULL;
414 void avfilter_draw_slice(AVFilterLink *link, int y, int h, int slice_dir)
416 uint8_t *src[4], *dst[4];
418 void (*draw_slice)(AVFilterLink *, int, int, int);
420 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);
422 /* copy the slice if needed for permission reasons */
424 vsub = av_pix_fmt_descriptors[link->format].log2_chroma_h;
426 for (i = 0; i < 4; i++) {
427 if (link->src_buf->data[i]) {
428 src[i] = link->src_buf-> data[i] +
429 (y >> (i==1 || i==2 ? vsub : 0)) * link->src_buf-> linesize[i];
430 dst[i] = link->cur_buf->data[i] +
431 (y >> (i==1 || i==2 ? vsub : 0)) * link->cur_buf->linesize[i];
433 src[i] = dst[i] = NULL;
436 for (i = 0; i < 4; i++) {
438 av_image_get_linesize(link->format, link->cur_buf->video->w, i);
440 if (!src[i]) continue;
442 for (j = 0; j < h >> (i==1 || i==2 ? vsub : 0); j++) {
443 memcpy(dst[i], src[i], planew);
444 src[i] += link->src_buf->linesize[i];
445 dst[i] += link->cur_buf->linesize[i];
450 if (!(draw_slice = link->dstpad->draw_slice))
451 draw_slice = avfilter_default_draw_slice;
452 draw_slice(link, y, h, slice_dir);
455 void avfilter_filter_samples(AVFilterLink *link, AVFilterBufferRef *samplesref)
457 void (*filter_samples)(AVFilterLink *, AVFilterBufferRef *);
458 AVFilterPad *dst = link->dstpad;
460 if (!(filter_samples = dst->filter_samples))
461 filter_samples = avfilter_default_filter_samples;
463 /* prepare to copy the samples if the buffer has insufficient permissions */
464 if ((dst->min_perms & samplesref->perms) != dst->min_perms ||
465 dst->rej_perms & samplesref->perms) {
467 av_log(link->dst, AV_LOG_DEBUG,
468 "Copying audio data in avfilter (have perms %x, need %x, reject %x)\n",
469 samplesref->perms, link->dstpad->min_perms, link->dstpad->rej_perms);
471 link->cur_buf = avfilter_default_get_audio_buffer(link, dst->min_perms,
473 samplesref->audio->size,
474 samplesref->audio->channel_layout,
475 samplesref->audio->planar);
476 link->cur_buf->pts = samplesref->pts;
477 link->cur_buf->audio->sample_rate = samplesref->audio->sample_rate;
479 /* Copy actual data into new samples buffer */
480 memcpy(link->cur_buf->data[0], samplesref->data[0], samplesref->audio->size);
482 avfilter_unref_buffer(samplesref);
484 link->cur_buf = samplesref;
486 filter_samples(link, link->cur_buf);
489 #define MAX_REGISTERED_AVFILTERS_NB 64
491 static AVFilter *registered_avfilters[MAX_REGISTERED_AVFILTERS_NB + 1];
493 static int next_registered_avfilter_idx = 0;
495 AVFilter *avfilter_get_by_name(const char *name)
499 for (i = 0; registered_avfilters[i]; i++)
500 if (!strcmp(registered_avfilters[i]->name, name))
501 return registered_avfilters[i];
506 int avfilter_register(AVFilter *filter)
508 if (next_registered_avfilter_idx == MAX_REGISTERED_AVFILTERS_NB)
511 registered_avfilters[next_registered_avfilter_idx++] = filter;
515 AVFilter **av_filter_next(AVFilter **filter)
517 return filter ? ++filter : ®istered_avfilters[0];
520 void avfilter_uninit(void)
522 memset(registered_avfilters, 0, sizeof(registered_avfilters));
523 next_registered_avfilter_idx = 0;
526 static int pad_count(const AVFilterPad *pads)
530 for(count = 0; pads->name; count ++) pads ++;
534 static const char *filter_name(void *p)
536 AVFilterContext *filter = p;
537 return filter->filter->name;
540 static const AVClass avfilter_class = {
544 LIBAVUTIL_VERSION_INT,
547 int avfilter_open(AVFilterContext **filter_ctx, AVFilter *filter, const char *inst_name)
549 AVFilterContext *ret;
553 return AVERROR(EINVAL);
555 ret = av_mallocz(sizeof(AVFilterContext));
557 ret->av_class = &avfilter_class;
558 ret->filter = filter;
559 ret->name = inst_name ? av_strdup(inst_name) : NULL;
560 ret->priv = av_mallocz(filter->priv_size);
562 ret->input_count = pad_count(filter->inputs);
563 if (ret->input_count) {
564 ret->input_pads = av_malloc(sizeof(AVFilterPad) * ret->input_count);
565 memcpy(ret->input_pads, filter->inputs, sizeof(AVFilterPad) * ret->input_count);
566 ret->inputs = av_mallocz(sizeof(AVFilterLink*) * ret->input_count);
569 ret->output_count = pad_count(filter->outputs);
570 if (ret->output_count) {
571 ret->output_pads = av_malloc(sizeof(AVFilterPad) * ret->output_count);
572 memcpy(ret->output_pads, filter->outputs, sizeof(AVFilterPad) * ret->output_count);
573 ret->outputs = av_mallocz(sizeof(AVFilterLink*) * ret->output_count);
580 void avfilter_free(AVFilterContext *filter)
585 if (filter->filter->uninit)
586 filter->filter->uninit(filter);
588 for (i = 0; i < filter->input_count; i++) {
589 if ((link = filter->inputs[i])) {
591 link->src->outputs[link->srcpad - link->src->output_pads] = NULL;
592 avfilter_formats_unref(&link->in_formats);
593 avfilter_formats_unref(&link->out_formats);
597 for (i = 0; i < filter->output_count; i++) {
598 if ((link = filter->outputs[i])) {
600 link->dst->inputs[link->dstpad - link->dst->input_pads] = NULL;
601 avfilter_formats_unref(&link->in_formats);
602 avfilter_formats_unref(&link->out_formats);
607 av_freep(&filter->name);
608 av_freep(&filter->input_pads);
609 av_freep(&filter->output_pads);
610 av_freep(&filter->inputs);
611 av_freep(&filter->outputs);
612 av_freep(&filter->priv);
616 int avfilter_init_filter(AVFilterContext *filter, const char *args, void *opaque)
620 if (filter->filter->init)
621 ret = filter->filter->init(filter, args, opaque);