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 "libavcodec/audioconvert.c"
25 #include "libavutil/pixdesc.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 && 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 *);
160 for (i = 0; i < filter->input_count; i ++) {
161 AVFilterLink *link = filter->inputs[i];
165 switch (link->init_state) {
168 case AVLINK_STARTINIT:
169 av_log(filter, AV_LOG_INFO, "circular filter chain detected\n");
172 link->init_state = AVLINK_STARTINIT;
174 if (avfilter_config_links(link->src))
177 if (!(config_link = link->srcpad->config_props))
178 config_link = avfilter_default_config_output_link;
179 if (config_link(link))
182 if ((config_link = link->dstpad->config_props))
183 if (config_link(link))
186 link->init_state = AVLINK_INIT;
193 char *ff_get_ref_perms_string(char *buf, size_t buf_size, int perms)
195 snprintf(buf, buf_size, "%s%s%s%s%s",
196 perms & AV_PERM_READ ? "r" : "",
197 perms & AV_PERM_WRITE ? "w" : "",
198 perms & AV_PERM_PRESERVE ? "p" : "",
199 perms & AV_PERM_REUSE ? "r" : "",
200 perms & AV_PERM_REUSE2 ? "R" : "");
204 void ff_dprintf_ref(void *ctx, AVFilterBufferRef *ref, int end)
206 av_unused char buf[16];
208 "ref[%p buf:%p refcount:%d perms:%s data:%p linesize[%d, %d, %d, %d] pts:%"PRId64" pos:%"PRId64,
209 ref, ref->buf, ref->buf->refcount, ff_get_ref_perms_string(buf, sizeof(buf), ref->perms), ref->data[0],
210 ref->linesize[0], ref->linesize[1], ref->linesize[2], ref->linesize[3],
214 dprintf(ctx, " a:%d/%d s:%dx%d i:%c",
215 ref->video->pixel_aspect.num, ref->video->pixel_aspect.den,
216 ref->video->w, ref->video->h,
217 !ref->video->interlaced ? 'P' : /* Progressive */
218 ref->video->top_field_first ? 'T' : 'B'); /* Top / Bottom */
221 dprintf(ctx, " cl:%"PRId64"d sn:%d s:%d sr:%d p:%d",
222 ref->audio->channel_layout,
223 ref->audio->samples_nb,
225 ref->audio->sample_rate,
229 dprintf(ctx, "]%s", end ? "\n" : "");
232 void ff_dprintf_link(void *ctx, AVFilterLink *link, int end)
235 "link[%p s:%dx%d fmt:%-16s %-16s->%-16s]%s",
236 link, link->w, link->h,
237 av_pix_fmt_descriptors[link->format].name,
238 link->src ? link->src->filter->name : "",
239 link->dst ? link->dst->filter->name : "",
243 AVFilterBufferRef *avfilter_get_video_buffer(AVFilterLink *link, int perms, int w, int h)
245 AVFilterBufferRef *ret = NULL;
247 av_unused char buf[16];
248 FF_DPRINTF_START(NULL, get_video_buffer); ff_dprintf_link(NULL, link, 0);
249 dprintf(NULL, " perms:%s w:%d h:%d\n", ff_get_ref_perms_string(buf, sizeof(buf), perms), w, h);
251 if (link->dstpad->get_video_buffer)
252 ret = link->dstpad->get_video_buffer(link, perms, w, h);
255 ret = avfilter_default_get_video_buffer(link, perms, w, h);
258 ret->type = AVMEDIA_TYPE_VIDEO;
260 FF_DPRINTF_START(NULL, get_video_buffer); ff_dprintf_link(NULL, link, 0); dprintf(NULL, " returning "); ff_dprintf_ref(NULL, ret, 1);
265 AVFilterBufferRef *avfilter_get_audio_buffer(AVFilterLink *link, int perms,
266 enum SampleFormat sample_fmt, int size,
267 int64_t channel_layout, int planar)
269 AVFilterBufferRef *ret = NULL;
271 if (link->dstpad->get_audio_buffer)
272 ret = link->dstpad->get_audio_buffer(link, perms, sample_fmt, size, channel_layout, planar);
275 ret = avfilter_default_get_audio_buffer(link, perms, sample_fmt, size, channel_layout, planar);
278 ret->type = AVMEDIA_TYPE_AUDIO;
283 int avfilter_request_frame(AVFilterLink *link)
285 FF_DPRINTF_START(NULL, request_frame); ff_dprintf_link(NULL, link, 1);
287 if (link->srcpad->request_frame)
288 return link->srcpad->request_frame(link);
289 else if (link->src->inputs[0])
290 return avfilter_request_frame(link->src->inputs[0]);
294 int avfilter_poll_frame(AVFilterLink *link)
296 int i, min = INT_MAX;
298 if (link->srcpad->poll_frame)
299 return link->srcpad->poll_frame(link);
301 for (i = 0; i < link->src->input_count; i++) {
303 if (!link->src->inputs[i])
305 val = avfilter_poll_frame(link->src->inputs[i]);
306 min = FFMIN(min, val);
312 /* XXX: should we do the duplicating of the picture ref here, instead of
313 * forcing the source filter to do it? */
314 void avfilter_start_frame(AVFilterLink *link, AVFilterBufferRef *picref)
316 void (*start_frame)(AVFilterLink *, AVFilterBufferRef *);
317 AVFilterPad *dst = link->dstpad;
319 FF_DPRINTF_START(NULL, start_frame); ff_dprintf_link(NULL, link, 0); dprintf(NULL, " "); ff_dprintf_ref(NULL, picref, 1);
321 if (!(start_frame = dst->start_frame))
322 start_frame = avfilter_default_start_frame;
324 /* prepare to copy the picture if it has insufficient permissions */
325 if ((dst->min_perms & picref->perms) != dst->min_perms ||
326 dst->rej_perms & picref->perms) {
327 av_log(link->dst, AV_LOG_DEBUG,
328 "frame copy needed (have perms %x, need %x, reject %x)\n",
330 link->dstpad->min_perms, link->dstpad->rej_perms);
332 link->cur_buf = avfilter_get_video_buffer(link, dst->min_perms, link->w, link->h);
333 link->src_buf = picref;
334 avfilter_copy_buffer_ref_props(link->cur_buf, link->src_buf);
337 link->cur_buf = picref;
339 start_frame(link, link->cur_buf);
342 void avfilter_end_frame(AVFilterLink *link)
344 void (*end_frame)(AVFilterLink *);
346 if (!(end_frame = link->dstpad->end_frame))
347 end_frame = avfilter_default_end_frame;
351 /* unreference the source picture if we're feeding the destination filter
352 * a copied version dues to permission issues */
354 avfilter_unref_buffer(link->src_buf);
355 link->src_buf = NULL;
359 void avfilter_draw_slice(AVFilterLink *link, int y, int h, int slice_dir)
361 uint8_t *src[4], *dst[4];
363 void (*draw_slice)(AVFilterLink *, int, int, int);
365 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);
367 /* copy the slice if needed for permission reasons */
369 vsub = av_pix_fmt_descriptors[link->format].log2_chroma_h;
371 for (i = 0; i < 4; i++) {
372 if (link->src_buf->data[i]) {
373 src[i] = link->src_buf-> data[i] +
374 (y >> (i==0 ? 0 : vsub)) * link->src_buf-> linesize[i];
375 dst[i] = link->cur_buf->data[i] +
376 (y >> (i==0 ? 0 : vsub)) * link->cur_buf->linesize[i];
378 src[i] = dst[i] = NULL;
381 for (i = 0; i < 4; i++) {
383 av_image_get_linesize(link->format, link->cur_buf->video->w, i);
385 if (!src[i]) continue;
387 for (j = 0; j < h >> (i==0 ? 0 : vsub); j++) {
388 memcpy(dst[i], src[i], planew);
389 src[i] += link->src_buf->linesize[i];
390 dst[i] += link->cur_buf->linesize[i];
395 if (!(draw_slice = link->dstpad->draw_slice))
396 draw_slice = avfilter_default_draw_slice;
397 draw_slice(link, y, h, slice_dir);
400 void avfilter_filter_samples(AVFilterLink *link, AVFilterBufferRef *samplesref)
402 void (*filter_samples)(AVFilterLink *, AVFilterBufferRef *);
403 AVFilterPad *dst = link->dstpad;
405 if (!(filter_samples = dst->filter_samples))
406 filter_samples = avfilter_default_filter_samples;
408 /* prepare to copy the samples if the buffer has insufficient permissions */
409 if ((dst->min_perms & samplesref->perms) != dst->min_perms ||
410 dst->rej_perms & samplesref->perms) {
412 av_log(link->dst, AV_LOG_DEBUG,
413 "Copying audio data in avfilter (have perms %x, need %x, reject %x)\n",
414 samplesref->perms, link->dstpad->min_perms, link->dstpad->rej_perms);
416 link->cur_buf = avfilter_default_get_audio_buffer(link, dst->min_perms,
418 samplesref->audio->size,
419 samplesref->audio->channel_layout,
420 samplesref->audio->planar);
421 link->cur_buf->pts = samplesref->pts;
422 link->cur_buf->audio->sample_rate = samplesref->audio->sample_rate;
424 /* Copy actual data into new samples buffer */
425 memcpy(link->cur_buf->data[0], samplesref->data[0], samplesref->audio->size);
427 avfilter_unref_buffer(samplesref);
429 link->cur_buf = samplesref;
431 filter_samples(link, link->cur_buf);
434 #define MAX_REGISTERED_AVFILTERS_NB 64
436 static AVFilter *registered_avfilters[MAX_REGISTERED_AVFILTERS_NB + 1];
438 static int next_registered_avfilter_idx = 0;
440 AVFilter *avfilter_get_by_name(const char *name)
444 for (i = 0; registered_avfilters[i]; i++)
445 if (!strcmp(registered_avfilters[i]->name, name))
446 return registered_avfilters[i];
451 int avfilter_register(AVFilter *filter)
453 if (next_registered_avfilter_idx == MAX_REGISTERED_AVFILTERS_NB)
456 registered_avfilters[next_registered_avfilter_idx++] = filter;
460 AVFilter **av_filter_next(AVFilter **filter)
462 return filter ? ++filter : ®istered_avfilters[0];
465 void avfilter_uninit(void)
467 memset(registered_avfilters, 0, sizeof(registered_avfilters));
468 next_registered_avfilter_idx = 0;
471 static int pad_count(const AVFilterPad *pads)
475 for(count = 0; pads->name; count ++) pads ++;
479 static const char *filter_name(void *p)
481 AVFilterContext *filter = p;
482 return filter->filter->name;
485 static const AVClass avfilter_class = {
489 LIBAVUTIL_VERSION_INT,
492 int avfilter_open(AVFilterContext **filter_ctx, AVFilter *filter, const char *inst_name)
494 AVFilterContext *ret;
498 return AVERROR(EINVAL);
500 ret = av_mallocz(sizeof(AVFilterContext));
502 ret->av_class = &avfilter_class;
503 ret->filter = filter;
504 ret->name = inst_name ? av_strdup(inst_name) : NULL;
505 ret->priv = av_mallocz(filter->priv_size);
507 ret->input_count = pad_count(filter->inputs);
508 if (ret->input_count) {
509 ret->input_pads = av_malloc(sizeof(AVFilterPad) * ret->input_count);
510 memcpy(ret->input_pads, filter->inputs, sizeof(AVFilterPad) * ret->input_count);
511 ret->inputs = av_mallocz(sizeof(AVFilterLink*) * ret->input_count);
514 ret->output_count = pad_count(filter->outputs);
515 if (ret->output_count) {
516 ret->output_pads = av_malloc(sizeof(AVFilterPad) * ret->output_count);
517 memcpy(ret->output_pads, filter->outputs, sizeof(AVFilterPad) * ret->output_count);
518 ret->outputs = av_mallocz(sizeof(AVFilterLink*) * ret->output_count);
525 void avfilter_destroy(AVFilterContext *filter)
530 if (filter->filter->uninit)
531 filter->filter->uninit(filter);
533 for (i = 0; i < filter->input_count; i++) {
534 if ((link = filter->inputs[i])) {
536 link->src->outputs[link->srcpad - link->src->output_pads] = NULL;
537 avfilter_formats_unref(&link->in_formats);
538 avfilter_formats_unref(&link->out_formats);
542 for (i = 0; i < filter->output_count; i++) {
543 if ((link = filter->outputs[i])) {
545 link->dst->inputs[link->dstpad - link->dst->input_pads] = NULL;
546 avfilter_formats_unref(&link->in_formats);
547 avfilter_formats_unref(&link->out_formats);
552 av_freep(&filter->name);
553 av_freep(&filter->input_pads);
554 av_freep(&filter->output_pads);
555 av_freep(&filter->inputs);
556 av_freep(&filter->outputs);
557 av_freep(&filter->priv);
561 int avfilter_init_filter(AVFilterContext *filter, const char *args, void *opaque)
565 if (filter->filter->init)
566 ret = filter->filter->init(filter, args, opaque);