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 "libavutil/rational.h"
27 #include "libavcore/imgutils.h"
31 unsigned avfilter_version(void) {
32 return LIBAVFILTER_VERSION_INT;
35 const char *avfilter_configuration(void)
37 return FFMPEG_CONFIGURATION;
40 const char *avfilter_license(void)
42 #define LICENSE_PREFIX "libavfilter license: "
43 return LICENSE_PREFIX FFMPEG_LICENSE + sizeof(LICENSE_PREFIX) - 1;
46 AVFilterBufferRef *avfilter_ref_buffer(AVFilterBufferRef *ref, int pmask)
48 AVFilterBufferRef *ret = av_malloc(sizeof(AVFilterBufferRef));
52 if (ref->type == AVMEDIA_TYPE_VIDEO) {
53 ret->video = av_malloc(sizeof(AVFilterBufferRefVideoProps));
58 *ret->video = *ref->video;
59 } else if (ref->type == AVMEDIA_TYPE_AUDIO) {
60 ret->audio = av_malloc(sizeof(AVFilterBufferRefAudioProps));
65 *ret->audio = *ref->audio;
68 ret->buf->refcount ++;
72 void avfilter_unref_buffer(AVFilterBufferRef *ref)
74 if (!(--ref->buf->refcount))
75 ref->buf->free(ref->buf);
81 void avfilter_insert_pad(unsigned idx, unsigned *count, size_t padidx_off,
82 AVFilterPad **pads, AVFilterLink ***links,
87 idx = FFMIN(idx, *count);
89 *pads = av_realloc(*pads, sizeof(AVFilterPad) * (*count + 1));
90 *links = av_realloc(*links, sizeof(AVFilterLink*) * (*count + 1));
91 memmove(*pads +idx+1, *pads +idx, sizeof(AVFilterPad) * (*count-idx));
92 memmove(*links+idx+1, *links+idx, sizeof(AVFilterLink*) * (*count-idx));
93 memcpy(*pads+idx, newpad, sizeof(AVFilterPad));
97 for (i = idx+1; i < *count; i++)
99 (*(unsigned *)((uint8_t *) *links[i] + padidx_off))++;
102 int avfilter_link(AVFilterContext *src, unsigned srcpad,
103 AVFilterContext *dst, unsigned dstpad)
107 if (src->output_count <= srcpad || dst->input_count <= dstpad ||
108 src->outputs[srcpad] || dst->inputs[dstpad])
111 src->outputs[srcpad] =
112 dst-> inputs[dstpad] = link = av_mallocz(sizeof(AVFilterLink));
116 link->srcpad = &src->output_pads[srcpad];
117 link->dstpad = &dst->input_pads[dstpad];
118 link->type = src->output_pads[srcpad].type;
119 assert(PIX_FMT_NONE == -1 && SAMPLE_FMT_NONE == -1);
125 int avfilter_insert_filter(AVFilterLink *link, AVFilterContext *filt,
126 unsigned filt_srcpad_idx, unsigned filt_dstpad_idx)
129 unsigned dstpad_idx = link->dstpad - link->dst->input_pads;
131 av_log(link->dst, AV_LOG_INFO, "auto-inserting filter '%s' "
132 "between the filter '%s' and the filter '%s'\n",
133 filt->name, link->src->name, link->dst->name);
135 link->dst->inputs[dstpad_idx] = NULL;
136 if ((ret = avfilter_link(filt, filt_dstpad_idx, link->dst, dstpad_idx)) < 0) {
137 /* failed to link output filter to new filter */
138 link->dst->inputs[dstpad_idx] = link;
142 /* re-hookup the link to the new destination filter we inserted */
144 link->dstpad = &filt->input_pads[filt_srcpad_idx];
145 filt->inputs[filt_srcpad_idx] = link;
147 /* if any information on supported media formats already exists on the
148 * link, we need to preserve that */
149 if (link->out_formats)
150 avfilter_formats_changeref(&link->out_formats,
151 &filt->outputs[filt_dstpad_idx]->out_formats);
156 int avfilter_config_links(AVFilterContext *filter)
158 int (*config_link)(AVFilterLink *);
162 for (i = 0; i < filter->input_count; i ++) {
163 AVFilterLink *link = filter->inputs[i];
167 switch (link->init_state) {
170 case AVLINK_STARTINIT:
171 av_log(filter, AV_LOG_INFO, "circular filter chain detected\n");
174 link->init_state = AVLINK_STARTINIT;
176 if ((ret = avfilter_config_links(link->src)) < 0)
179 if (!(config_link = link->srcpad->config_props))
180 config_link = avfilter_default_config_output_link;
181 if ((ret = config_link(link)) < 0)
184 if (link->time_base.num == 0 && link->time_base.den == 0)
185 link->time_base = link->src && link->src->input_count ?
186 link->src->inputs[0]->time_base : AV_TIME_BASE_Q;
188 if ((config_link = link->dstpad->config_props))
189 if ((ret = config_link(link)) < 0)
192 link->init_state = AVLINK_INIT;
199 char *ff_get_ref_perms_string(char *buf, size_t buf_size, int perms)
201 snprintf(buf, buf_size, "%s%s%s%s%s",
202 perms & AV_PERM_READ ? "r" : "",
203 perms & AV_PERM_WRITE ? "w" : "",
204 perms & AV_PERM_PRESERVE ? "p" : "",
205 perms & AV_PERM_REUSE ? "r" : "",
206 perms & AV_PERM_REUSE2 ? "R" : "");
210 void ff_dprintf_ref(void *ctx, AVFilterBufferRef *ref, int end)
212 av_unused char buf[16];
214 "ref[%p buf:%p refcount:%d perms:%s data:%p linesize[%d, %d, %d, %d] pts:%"PRId64" pos:%"PRId64,
215 ref, ref->buf, ref->buf->refcount, ff_get_ref_perms_string(buf, sizeof(buf), ref->perms), ref->data[0],
216 ref->linesize[0], ref->linesize[1], ref->linesize[2], ref->linesize[3],
220 dprintf(ctx, " a:%d/%d s:%dx%d i:%c",
221 ref->video->pixel_aspect.num, ref->video->pixel_aspect.den,
222 ref->video->w, ref->video->h,
223 !ref->video->interlaced ? 'P' : /* Progressive */
224 ref->video->top_field_first ? 'T' : 'B'); /* Top / Bottom */
227 dprintf(ctx, " cl:%"PRId64"d sn:%d s:%d sr:%d p:%d",
228 ref->audio->channel_layout,
229 ref->audio->samples_nb,
231 ref->audio->sample_rate,
235 dprintf(ctx, "]%s", end ? "\n" : "");
238 void ff_dprintf_link(void *ctx, AVFilterLink *link, int end)
241 "link[%p s:%dx%d fmt:%-16s %-16s->%-16s]%s",
242 link, link->w, link->h,
243 av_pix_fmt_descriptors[link->format].name,
244 link->src ? link->src->filter->name : "",
245 link->dst ? link->dst->filter->name : "",
249 AVFilterBufferRef *avfilter_get_video_buffer(AVFilterLink *link, int perms, int w, int h)
251 AVFilterBufferRef *ret = NULL;
253 av_unused char buf[16];
254 FF_DPRINTF_START(NULL, get_video_buffer); ff_dprintf_link(NULL, link, 0);
255 dprintf(NULL, " perms:%s w:%d h:%d\n", ff_get_ref_perms_string(buf, sizeof(buf), perms), w, h);
257 if (link->dstpad->get_video_buffer)
258 ret = link->dstpad->get_video_buffer(link, perms, w, h);
261 ret = avfilter_default_get_video_buffer(link, perms, w, h);
264 ret->type = AVMEDIA_TYPE_VIDEO;
266 FF_DPRINTF_START(NULL, get_video_buffer); ff_dprintf_link(NULL, link, 0); dprintf(NULL, " returning "); ff_dprintf_ref(NULL, ret, 1);
271 AVFilterBufferRef *avfilter_get_audio_buffer(AVFilterLink *link, int perms,
272 enum SampleFormat sample_fmt, int size,
273 int64_t channel_layout, int planar)
275 AVFilterBufferRef *ret = NULL;
277 if (link->dstpad->get_audio_buffer)
278 ret = link->dstpad->get_audio_buffer(link, perms, sample_fmt, size, channel_layout, planar);
281 ret = avfilter_default_get_audio_buffer(link, perms, sample_fmt, size, channel_layout, planar);
284 ret->type = AVMEDIA_TYPE_AUDIO;
289 int avfilter_request_frame(AVFilterLink *link)
291 FF_DPRINTF_START(NULL, request_frame); ff_dprintf_link(NULL, link, 1);
293 if (link->srcpad->request_frame)
294 return link->srcpad->request_frame(link);
295 else if (link->src->inputs[0])
296 return avfilter_request_frame(link->src->inputs[0]);
300 int avfilter_poll_frame(AVFilterLink *link)
302 int i, min = INT_MAX;
304 if (link->srcpad->poll_frame)
305 return link->srcpad->poll_frame(link);
307 for (i = 0; i < link->src->input_count; i++) {
309 if (!link->src->inputs[i])
311 val = avfilter_poll_frame(link->src->inputs[i]);
312 min = FFMIN(min, val);
318 /* XXX: should we do the duplicating of the picture ref here, instead of
319 * forcing the source filter to do it? */
320 void avfilter_start_frame(AVFilterLink *link, AVFilterBufferRef *picref)
322 void (*start_frame)(AVFilterLink *, AVFilterBufferRef *);
323 AVFilterPad *dst = link->dstpad;
325 FF_DPRINTF_START(NULL, start_frame); ff_dprintf_link(NULL, link, 0); dprintf(NULL, " "); ff_dprintf_ref(NULL, picref, 1);
327 if (!(start_frame = dst->start_frame))
328 start_frame = avfilter_default_start_frame;
330 /* prepare to copy the picture if it has insufficient permissions */
331 if ((dst->min_perms & picref->perms) != dst->min_perms ||
332 dst->rej_perms & picref->perms) {
333 av_log(link->dst, AV_LOG_DEBUG,
334 "frame copy needed (have perms %x, need %x, reject %x)\n",
336 link->dstpad->min_perms, link->dstpad->rej_perms);
338 link->cur_buf = avfilter_get_video_buffer(link, dst->min_perms, link->w, link->h);
339 link->src_buf = picref;
340 avfilter_copy_buffer_ref_props(link->cur_buf, link->src_buf);
343 link->cur_buf = picref;
345 start_frame(link, link->cur_buf);
348 void avfilter_end_frame(AVFilterLink *link)
350 void (*end_frame)(AVFilterLink *);
352 if (!(end_frame = link->dstpad->end_frame))
353 end_frame = avfilter_default_end_frame;
357 /* unreference the source picture if we're feeding the destination filter
358 * a copied version dues to permission issues */
360 avfilter_unref_buffer(link->src_buf);
361 link->src_buf = NULL;
365 void avfilter_draw_slice(AVFilterLink *link, int y, int h, int slice_dir)
367 uint8_t *src[4], *dst[4];
369 void (*draw_slice)(AVFilterLink *, int, int, int);
371 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);
373 /* copy the slice if needed for permission reasons */
375 vsub = av_pix_fmt_descriptors[link->format].log2_chroma_h;
377 for (i = 0; i < 4; i++) {
378 if (link->src_buf->data[i]) {
379 src[i] = link->src_buf-> data[i] +
380 (y >> (i==0 ? 0 : vsub)) * link->src_buf-> linesize[i];
381 dst[i] = link->cur_buf->data[i] +
382 (y >> (i==0 ? 0 : vsub)) * link->cur_buf->linesize[i];
384 src[i] = dst[i] = NULL;
387 for (i = 0; i < 4; i++) {
389 av_image_get_linesize(link->format, link->cur_buf->video->w, i);
391 if (!src[i]) continue;
393 for (j = 0; j < h >> (i==0 ? 0 : vsub); j++) {
394 memcpy(dst[i], src[i], planew);
395 src[i] += link->src_buf->linesize[i];
396 dst[i] += link->cur_buf->linesize[i];
401 if (!(draw_slice = link->dstpad->draw_slice))
402 draw_slice = avfilter_default_draw_slice;
403 draw_slice(link, y, h, slice_dir);
406 void avfilter_filter_samples(AVFilterLink *link, AVFilterBufferRef *samplesref)
408 void (*filter_samples)(AVFilterLink *, AVFilterBufferRef *);
409 AVFilterPad *dst = link->dstpad;
411 if (!(filter_samples = dst->filter_samples))
412 filter_samples = avfilter_default_filter_samples;
414 /* prepare to copy the samples if the buffer has insufficient permissions */
415 if ((dst->min_perms & samplesref->perms) != dst->min_perms ||
416 dst->rej_perms & samplesref->perms) {
418 av_log(link->dst, AV_LOG_DEBUG,
419 "Copying audio data in avfilter (have perms %x, need %x, reject %x)\n",
420 samplesref->perms, link->dstpad->min_perms, link->dstpad->rej_perms);
422 link->cur_buf = avfilter_default_get_audio_buffer(link, dst->min_perms,
424 samplesref->audio->size,
425 samplesref->audio->channel_layout,
426 samplesref->audio->planar);
427 link->cur_buf->pts = samplesref->pts;
428 link->cur_buf->audio->sample_rate = samplesref->audio->sample_rate;
430 /* Copy actual data into new samples buffer */
431 memcpy(link->cur_buf->data[0], samplesref->data[0], samplesref->audio->size);
433 avfilter_unref_buffer(samplesref);
435 link->cur_buf = samplesref;
437 filter_samples(link, link->cur_buf);
440 #define MAX_REGISTERED_AVFILTERS_NB 64
442 static AVFilter *registered_avfilters[MAX_REGISTERED_AVFILTERS_NB + 1];
444 static int next_registered_avfilter_idx = 0;
446 AVFilter *avfilter_get_by_name(const char *name)
450 for (i = 0; registered_avfilters[i]; i++)
451 if (!strcmp(registered_avfilters[i]->name, name))
452 return registered_avfilters[i];
457 int avfilter_register(AVFilter *filter)
459 if (next_registered_avfilter_idx == MAX_REGISTERED_AVFILTERS_NB)
462 registered_avfilters[next_registered_avfilter_idx++] = filter;
466 AVFilter **av_filter_next(AVFilter **filter)
468 return filter ? ++filter : ®istered_avfilters[0];
471 void avfilter_uninit(void)
473 memset(registered_avfilters, 0, sizeof(registered_avfilters));
474 next_registered_avfilter_idx = 0;
477 static int pad_count(const AVFilterPad *pads)
481 for(count = 0; pads->name; count ++) pads ++;
485 static const char *filter_name(void *p)
487 AVFilterContext *filter = p;
488 return filter->filter->name;
491 static const AVClass avfilter_class = {
495 LIBAVUTIL_VERSION_INT,
498 int avfilter_open(AVFilterContext **filter_ctx, AVFilter *filter, const char *inst_name)
500 AVFilterContext *ret;
504 return AVERROR(EINVAL);
506 ret = av_mallocz(sizeof(AVFilterContext));
508 ret->av_class = &avfilter_class;
509 ret->filter = filter;
510 ret->name = inst_name ? av_strdup(inst_name) : NULL;
511 ret->priv = av_mallocz(filter->priv_size);
513 ret->input_count = pad_count(filter->inputs);
514 if (ret->input_count) {
515 ret->input_pads = av_malloc(sizeof(AVFilterPad) * ret->input_count);
516 memcpy(ret->input_pads, filter->inputs, sizeof(AVFilterPad) * ret->input_count);
517 ret->inputs = av_mallocz(sizeof(AVFilterLink*) * ret->input_count);
520 ret->output_count = pad_count(filter->outputs);
521 if (ret->output_count) {
522 ret->output_pads = av_malloc(sizeof(AVFilterPad) * ret->output_count);
523 memcpy(ret->output_pads, filter->outputs, sizeof(AVFilterPad) * ret->output_count);
524 ret->outputs = av_mallocz(sizeof(AVFilterLink*) * ret->output_count);
531 void avfilter_destroy(AVFilterContext *filter)
536 if (filter->filter->uninit)
537 filter->filter->uninit(filter);
539 for (i = 0; i < filter->input_count; i++) {
540 if ((link = filter->inputs[i])) {
542 link->src->outputs[link->srcpad - link->src->output_pads] = NULL;
543 avfilter_formats_unref(&link->in_formats);
544 avfilter_formats_unref(&link->out_formats);
548 for (i = 0; i < filter->output_count; i++) {
549 if ((link = filter->outputs[i])) {
551 link->dst->inputs[link->dstpad - link->dst->input_pads] = NULL;
552 avfilter_formats_unref(&link->in_formats);
553 avfilter_formats_unref(&link->out_formats);
558 av_freep(&filter->name);
559 av_freep(&filter->input_pads);
560 av_freep(&filter->output_pads);
561 av_freep(&filter->inputs);
562 av_freep(&filter->outputs);
563 av_freep(&filter->priv);
567 int avfilter_init_filter(AVFilterContext *filter, const char *args, void *opaque)
571 if (filter->filter->init)
572 ret = filter->filter->init(filter, args, opaque);