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 ? "u" : "",
205 perms & AV_PERM_REUSE2 ? "U" : "");
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);
271 avfilter_get_video_buffer_ref_from_arrays(uint8_t *data[4], int linesize[4], int perms,
272 int w, int h, enum PixelFormat format)
274 AVFilterBuffer *pic = av_mallocz(sizeof(AVFilterBuffer));
275 AVFilterBufferRef *picref = av_mallocz(sizeof(AVFilterBufferRef));
281 picref->buf->free = ff_avfilter_default_free_buffer;
282 if (!(picref->video = av_mallocz(sizeof(AVFilterBufferRefVideoProps))))
285 picref->video->w = w;
286 picref->video->h = h;
288 /* make sure the buffer gets read permission or it's useless for output */
289 picref->perms = perms | AV_PERM_READ;
292 picref->type = AVMEDIA_TYPE_VIDEO;
293 picref->format = format;
295 memcpy(pic->data, data, sizeof(pic->data));
296 memcpy(pic->linesize, linesize, sizeof(pic->linesize));
297 memcpy(picref->data, pic->data, sizeof(picref->data));
298 memcpy(picref->linesize, pic->linesize, sizeof(picref->linesize));
303 if (picref && picref->video)
304 av_free(picref->video);
310 AVFilterBufferRef *avfilter_get_audio_buffer(AVFilterLink *link, int perms,
311 enum AVSampleFormat sample_fmt, int size,
312 int64_t channel_layout, int planar)
314 AVFilterBufferRef *ret = NULL;
316 if (link->dstpad->get_audio_buffer)
317 ret = link->dstpad->get_audio_buffer(link, perms, sample_fmt, size, channel_layout, planar);
320 ret = avfilter_default_get_audio_buffer(link, perms, sample_fmt, size, channel_layout, planar);
323 ret->type = AVMEDIA_TYPE_AUDIO;
328 int avfilter_request_frame(AVFilterLink *link)
330 FF_DPRINTF_START(NULL, request_frame); ff_dprintf_link(NULL, link, 1);
332 if (link->srcpad->request_frame)
333 return link->srcpad->request_frame(link);
334 else if (link->src->inputs[0])
335 return avfilter_request_frame(link->src->inputs[0]);
339 int avfilter_poll_frame(AVFilterLink *link)
341 int i, min = INT_MAX;
343 if (link->srcpad->poll_frame)
344 return link->srcpad->poll_frame(link);
346 for (i = 0; i < link->src->input_count; i++) {
348 if (!link->src->inputs[i])
350 val = avfilter_poll_frame(link->src->inputs[i]);
351 min = FFMIN(min, val);
357 /* XXX: should we do the duplicating of the picture ref here, instead of
358 * forcing the source filter to do it? */
359 void avfilter_start_frame(AVFilterLink *link, AVFilterBufferRef *picref)
361 void (*start_frame)(AVFilterLink *, AVFilterBufferRef *);
362 AVFilterPad *dst = link->dstpad;
364 FF_DPRINTF_START(NULL, start_frame); ff_dprintf_link(NULL, link, 0); dprintf(NULL, " "); ff_dprintf_ref(NULL, picref, 1);
366 if (!(start_frame = dst->start_frame))
367 start_frame = avfilter_default_start_frame;
369 /* prepare to copy the picture if it has insufficient permissions */
370 if ((dst->min_perms & picref->perms) != dst->min_perms ||
371 dst->rej_perms & picref->perms) {
372 av_log(link->dst, AV_LOG_DEBUG,
373 "frame copy needed (have perms %x, need %x, reject %x)\n",
375 link->dstpad->min_perms, link->dstpad->rej_perms);
377 link->cur_buf = avfilter_get_video_buffer(link, dst->min_perms, link->w, link->h);
378 link->src_buf = picref;
379 avfilter_copy_buffer_ref_props(link->cur_buf, link->src_buf);
382 link->cur_buf = picref;
384 start_frame(link, link->cur_buf);
387 void avfilter_end_frame(AVFilterLink *link)
389 void (*end_frame)(AVFilterLink *);
391 if (!(end_frame = link->dstpad->end_frame))
392 end_frame = avfilter_default_end_frame;
396 /* unreference the source picture if we're feeding the destination filter
397 * a copied version dues to permission issues */
399 avfilter_unref_buffer(link->src_buf);
400 link->src_buf = NULL;
404 void avfilter_draw_slice(AVFilterLink *link, int y, int h, int slice_dir)
406 uint8_t *src[4], *dst[4];
408 void (*draw_slice)(AVFilterLink *, int, int, int);
410 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);
412 /* copy the slice if needed for permission reasons */
414 vsub = av_pix_fmt_descriptors[link->format].log2_chroma_h;
416 for (i = 0; i < 4; i++) {
417 if (link->src_buf->data[i]) {
418 src[i] = link->src_buf-> data[i] +
419 (y >> (i==1 || i==2 ? vsub : 0)) * link->src_buf-> linesize[i];
420 dst[i] = link->cur_buf->data[i] +
421 (y >> (i==1 || i==2 ? vsub : 0)) * link->cur_buf->linesize[i];
423 src[i] = dst[i] = NULL;
426 for (i = 0; i < 4; i++) {
428 av_image_get_linesize(link->format, link->cur_buf->video->w, i);
430 if (!src[i]) continue;
432 for (j = 0; j < h >> (i==1 || i==2 ? vsub : 0); j++) {
433 memcpy(dst[i], src[i], planew);
434 src[i] += link->src_buf->linesize[i];
435 dst[i] += link->cur_buf->linesize[i];
440 if (!(draw_slice = link->dstpad->draw_slice))
441 draw_slice = avfilter_default_draw_slice;
442 draw_slice(link, y, h, slice_dir);
445 void avfilter_filter_samples(AVFilterLink *link, AVFilterBufferRef *samplesref)
447 void (*filter_samples)(AVFilterLink *, AVFilterBufferRef *);
448 AVFilterPad *dst = link->dstpad;
450 if (!(filter_samples = dst->filter_samples))
451 filter_samples = avfilter_default_filter_samples;
453 /* prepare to copy the samples if the buffer has insufficient permissions */
454 if ((dst->min_perms & samplesref->perms) != dst->min_perms ||
455 dst->rej_perms & samplesref->perms) {
457 av_log(link->dst, AV_LOG_DEBUG,
458 "Copying audio data in avfilter (have perms %x, need %x, reject %x)\n",
459 samplesref->perms, link->dstpad->min_perms, link->dstpad->rej_perms);
461 link->cur_buf = avfilter_default_get_audio_buffer(link, dst->min_perms,
463 samplesref->audio->size,
464 samplesref->audio->channel_layout,
465 samplesref->audio->planar);
466 link->cur_buf->pts = samplesref->pts;
467 link->cur_buf->audio->sample_rate = samplesref->audio->sample_rate;
469 /* Copy actual data into new samples buffer */
470 memcpy(link->cur_buf->data[0], samplesref->data[0], samplesref->audio->size);
472 avfilter_unref_buffer(samplesref);
474 link->cur_buf = samplesref;
476 filter_samples(link, link->cur_buf);
479 #define MAX_REGISTERED_AVFILTERS_NB 64
481 static AVFilter *registered_avfilters[MAX_REGISTERED_AVFILTERS_NB + 1];
483 static int next_registered_avfilter_idx = 0;
485 AVFilter *avfilter_get_by_name(const char *name)
489 for (i = 0; registered_avfilters[i]; i++)
490 if (!strcmp(registered_avfilters[i]->name, name))
491 return registered_avfilters[i];
496 int avfilter_register(AVFilter *filter)
498 if (next_registered_avfilter_idx == MAX_REGISTERED_AVFILTERS_NB)
501 registered_avfilters[next_registered_avfilter_idx++] = filter;
505 AVFilter **av_filter_next(AVFilter **filter)
507 return filter ? ++filter : ®istered_avfilters[0];
510 void avfilter_uninit(void)
512 memset(registered_avfilters, 0, sizeof(registered_avfilters));
513 next_registered_avfilter_idx = 0;
516 static int pad_count(const AVFilterPad *pads)
520 for(count = 0; pads->name; count ++) pads ++;
524 static const char *filter_name(void *p)
526 AVFilterContext *filter = p;
527 return filter->filter->name;
530 static const AVClass avfilter_class = {
534 LIBAVUTIL_VERSION_INT,
537 int avfilter_open(AVFilterContext **filter_ctx, AVFilter *filter, const char *inst_name)
539 AVFilterContext *ret;
543 return AVERROR(EINVAL);
545 ret = av_mallocz(sizeof(AVFilterContext));
547 ret->av_class = &avfilter_class;
548 ret->filter = filter;
549 ret->name = inst_name ? av_strdup(inst_name) : NULL;
550 ret->priv = av_mallocz(filter->priv_size);
552 ret->input_count = pad_count(filter->inputs);
553 if (ret->input_count) {
554 ret->input_pads = av_malloc(sizeof(AVFilterPad) * ret->input_count);
555 memcpy(ret->input_pads, filter->inputs, sizeof(AVFilterPad) * ret->input_count);
556 ret->inputs = av_mallocz(sizeof(AVFilterLink*) * ret->input_count);
559 ret->output_count = pad_count(filter->outputs);
560 if (ret->output_count) {
561 ret->output_pads = av_malloc(sizeof(AVFilterPad) * ret->output_count);
562 memcpy(ret->output_pads, filter->outputs, sizeof(AVFilterPad) * ret->output_count);
563 ret->outputs = av_mallocz(sizeof(AVFilterLink*) * ret->output_count);
570 void avfilter_free(AVFilterContext *filter)
575 if (filter->filter->uninit)
576 filter->filter->uninit(filter);
578 for (i = 0; i < filter->input_count; i++) {
579 if ((link = filter->inputs[i])) {
581 link->src->outputs[link->srcpad - link->src->output_pads] = NULL;
582 avfilter_formats_unref(&link->in_formats);
583 avfilter_formats_unref(&link->out_formats);
587 for (i = 0; i < filter->output_count; i++) {
588 if ((link = filter->outputs[i])) {
590 link->dst->inputs[link->dstpad - link->dst->input_pads] = NULL;
591 avfilter_formats_unref(&link->in_formats);
592 avfilter_formats_unref(&link->out_formats);
597 av_freep(&filter->name);
598 av_freep(&filter->input_pads);
599 av_freep(&filter->output_pads);
600 av_freep(&filter->inputs);
601 av_freep(&filter->outputs);
602 av_freep(&filter->priv);
606 int avfilter_init_filter(AVFilterContext *filter, const char *args, void *opaque)
610 if (filter->filter->init)
611 ret = filter->filter->init(filter, args, opaque);