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ffmpeg/libavfilter/avfilter.c

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/*
* filter layer
* Copyright (c) 2007 Bobby Bingham
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/* #define DEBUG */
#include "libavutil/pixdesc.h"
#include "libavutil/rational.h"
#include "libavutil/audioconvert.h"
#include "libavutil/imgutils.h"
#include "libavutil/avassert.h"
#include "libavutil/avstring.h"
#include "avfilter.h"
#include "internal.h"
unsigned avfilter_version(void) {
return LIBAVFILTER_VERSION_INT;
}
const char *avfilter_configuration(void)
{
return FFMPEG_CONFIGURATION;
}
const char *avfilter_license(void)
{
#define LICENSE_PREFIX "libavfilter license: "
return LICENSE_PREFIX FFMPEG_LICENSE + sizeof(LICENSE_PREFIX) - 1;
}
static void command_queue_pop(AVFilterContext *filter)
{
AVFilterCommand *c= filter->command_queue;
av_freep(&c->arg);
av_freep(&c->command);
filter->command_queue= c->next;
av_free(c);
}
AVFilterBufferRef *avfilter_ref_buffer(AVFilterBufferRef *ref, int pmask)
{
AVFilterBufferRef *ret = av_malloc(sizeof(AVFilterBufferRef));
if (!ret)
return NULL;
*ret = *ref;
if (ref->type == AVMEDIA_TYPE_VIDEO) {
ret->video = av_malloc(sizeof(AVFilterBufferRefVideoProps));
if (!ret->video) {
av_free(ret);
return NULL;
}
*ret->video = *ref->video;
} else if (ref->type == AVMEDIA_TYPE_AUDIO) {
ret->audio = av_malloc(sizeof(AVFilterBufferRefAudioProps));
if (!ret->audio) {
av_free(ret);
return NULL;
}
*ret->audio = *ref->audio;
}
ret->perms &= pmask;
ret->buf->refcount ++;
return ret;
}
static void store_in_pool(AVFilterBufferRef *ref)
{
int i;
AVFilterPool *pool= ref->buf->priv;
av_assert0(ref->buf->data[0]);
if (pool->count == POOL_SIZE) {
AVFilterBufferRef *ref1 = pool->pic[0];
av_freep(&ref1->video);
av_freep(&ref1->audio);
av_freep(&ref1->buf->data[0]);
av_freep(&ref1->buf);
av_free(ref1);
memmove(&pool->pic[0], &pool->pic[1], sizeof(void*)*(POOL_SIZE-1));
pool->count--;
pool->pic[POOL_SIZE-1] = NULL;
}
for (i = 0; i < POOL_SIZE; i++) {
if (!pool->pic[i]) {
pool->pic[i] = ref;
pool->count++;
break;
}
}
}
void avfilter_unref_buffer(AVFilterBufferRef *ref)
{
if (!ref)
return;
if (!(--ref->buf->refcount)) {
if (!ref->buf->free) {
store_in_pool(ref);
return;
}
ref->buf->free(ref->buf);
}
av_freep(&ref->video);
av_freep(&ref->audio);
av_free(ref);
}
void avfilter_insert_pad(unsigned idx, unsigned *count, size_t padidx_off,
AVFilterPad **pads, AVFilterLink ***links,
AVFilterPad *newpad)
{
unsigned i;
idx = FFMIN(idx, *count);
*pads = av_realloc(*pads, sizeof(AVFilterPad) * (*count + 1));
*links = av_realloc(*links, sizeof(AVFilterLink*) * (*count + 1));
memmove(*pads +idx+1, *pads +idx, sizeof(AVFilterPad) * (*count-idx));
memmove(*links+idx+1, *links+idx, sizeof(AVFilterLink*) * (*count-idx));
memcpy(*pads+idx, newpad, sizeof(AVFilterPad));
(*links)[idx] = NULL;
(*count)++;
for (i = idx+1; i < *count; i++)
if (*links[i])
(*(unsigned *)((uint8_t *) *links[i] + padidx_off))++;
}
int avfilter_link(AVFilterContext *src, unsigned srcpad,
AVFilterContext *dst, unsigned dstpad)
{
AVFilterLink *link;
if (src->output_count <= srcpad || dst->input_count <= dstpad ||
src->outputs[srcpad] || dst->inputs[dstpad])
return -1;
if (src->output_pads[srcpad].type != dst->input_pads[dstpad].type) {
av_log(src, AV_LOG_ERROR,
"Media type mismatch between the '%s' filter output pad %d and the '%s' filter input pad %d\n",
src->name, srcpad, dst->name, dstpad);
return AVERROR(EINVAL);
}
src->outputs[srcpad] =
dst-> inputs[dstpad] = link = av_mallocz(sizeof(AVFilterLink));
link->src = src;
link->dst = dst;
link->srcpad = &src->output_pads[srcpad];
link->dstpad = &dst->input_pads[dstpad];
link->type = src->output_pads[srcpad].type;
assert(PIX_FMT_NONE == -1 && AV_SAMPLE_FMT_NONE == -1);
link->format = -1;
return 0;
}
void avfilter_link_free(AVFilterLink **link)
{
if (!*link)
return;
if ((*link)->pool) {
int i;
for (i = 0; i < POOL_SIZE; i++) {
if ((*link)->pool->pic[i]) {
AVFilterBufferRef *picref = (*link)->pool->pic[i];
/* free buffer: picrefs stored in the pool are not
* supposed to contain a free callback */
av_freep(&picref->buf->data[0]);
av_freep(&picref->buf);
av_freep(&picref->audio);
av_freep(&picref->video);
av_freep(&(*link)->pool->pic[i]);
}
}
(*link)->pool->count = 0;
// av_freep(&(*link)->pool);
}
av_freep(link);
}
int avfilter_insert_filter(AVFilterLink *link, AVFilterContext *filt,
unsigned filt_srcpad_idx, unsigned filt_dstpad_idx)
{
int ret;
unsigned dstpad_idx = link->dstpad - link->dst->input_pads;
av_log(link->dst, AV_LOG_INFO, "auto-inserting filter '%s' "
"between the filter '%s' and the filter '%s'\n",
filt->name, link->src->name, link->dst->name);
link->dst->inputs[dstpad_idx] = NULL;
if ((ret = avfilter_link(filt, filt_dstpad_idx, link->dst, dstpad_idx)) < 0) {
/* failed to link output filter to new filter */
link->dst->inputs[dstpad_idx] = link;
return ret;
}
/* re-hookup the link to the new destination filter we inserted */
link->dst = filt;
link->dstpad = &filt->input_pads[filt_srcpad_idx];
filt->inputs[filt_srcpad_idx] = link;
/* if any information on supported media formats already exists on the
* link, we need to preserve that */
if (link->out_formats)
avfilter_formats_changeref(&link->out_formats,
&filt->outputs[filt_dstpad_idx]->out_formats);
if (link->out_chlayouts)
avfilter_formats_changeref(&link->out_chlayouts,
&filt->outputs[filt_dstpad_idx]->out_chlayouts);
if (link->out_packing)
avfilter_formats_changeref(&link->out_packing,
&filt->outputs[filt_dstpad_idx]->out_packing);
return 0;
}
int avfilter_config_links(AVFilterContext *filter)
{
int (*config_link)(AVFilterLink *);
unsigned i;
int ret;
for (i = 0; i < filter->input_count; i ++) {
AVFilterLink *link = filter->inputs[i];
if (!link) continue;
switch (link->init_state) {
case AVLINK_INIT:
continue;
case AVLINK_STARTINIT:
av_log(filter, AV_LOG_INFO, "circular filter chain detected\n");
return 0;
case AVLINK_UNINIT:
link->init_state = AVLINK_STARTINIT;
if ((ret = avfilter_config_links(link->src)) < 0)
return ret;
if (!(config_link = link->srcpad->config_props)) {
if (link->src->input_count != 1) {
av_log(link->src, AV_LOG_ERROR, "Source filters and filters "
"with more than one input "
"must set config_props() "
"callbacks on all outputs\n");
return AVERROR(EINVAL);
}
} else if ((ret = config_link(link)) < 0)
return ret;
switch (link->type) {
case AVMEDIA_TYPE_VIDEO:
if (!link->time_base.num && !link->time_base.den)
link->time_base = link->src->input_count ?
link->src->inputs[0]->time_base : AV_TIME_BASE_Q;
if (!link->sample_aspect_ratio.num && !link->sample_aspect_ratio.den)
link->sample_aspect_ratio = link->src->input_count ?
link->src->inputs[0]->sample_aspect_ratio : (AVRational){1,1};
if (link->src->input_count) {
if (!link->w)
link->w = link->src->inputs[0]->w;
if (!link->h)
link->h = link->src->inputs[0]->h;
} else if (!link->w || !link->h) {
av_log(link->src, AV_LOG_ERROR,
"Video source filters must set their output link's "
"width and height\n");
return AVERROR(EINVAL);
}
break;
case AVMEDIA_TYPE_AUDIO:
if (link->src->input_count) {
if (!link->sample_rate)
link->sample_rate = link->src->inputs[0]->sample_rate;
} else if (!link->sample_rate) {
av_log(link->src, AV_LOG_ERROR,
"Audio source filters must set their output link's "
"sample_rate\n");
return AVERROR(EINVAL);
}
}
if ((config_link = link->dstpad->config_props))
if ((ret = config_link(link)) < 0)
return ret;
link->init_state = AVLINK_INIT;
}
}
return 0;
}
static char *ff_get_ref_perms_string(char *buf, size_t buf_size, int perms)
{
snprintf(buf, buf_size, "%s%s%s%s%s%s",
perms & AV_PERM_READ ? "r" : "",
perms & AV_PERM_WRITE ? "w" : "",
perms & AV_PERM_PRESERVE ? "p" : "",
perms & AV_PERM_REUSE ? "u" : "",
perms & AV_PERM_REUSE2 ? "U" : "",
perms & AV_PERM_NEG_LINESIZES ? "n" : "");
return buf;
}
static void ff_dlog_ref(void *ctx, AVFilterBufferRef *ref, int end)
{
av_unused char buf[16];
av_dlog(ctx,
"ref[%p buf:%p refcount:%d perms:%s data:%p linesize[%d, %d, %d, %d] pts:%"PRId64" pos:%"PRId64,
ref, ref->buf, ref->buf->refcount, ff_get_ref_perms_string(buf, sizeof(buf), ref->perms), ref->data[0],
ref->linesize[0], ref->linesize[1], ref->linesize[2], ref->linesize[3],
ref->pts, ref->pos);
if (ref->video) {
av_dlog(ctx, " a:%d/%d s:%dx%d i:%c iskey:%d type:%c",
ref->video->sample_aspect_ratio.num, ref->video->sample_aspect_ratio.den,
ref->video->w, ref->video->h,
!ref->video->interlaced ? 'P' : /* Progressive */
ref->video->top_field_first ? 'T' : 'B', /* Top / Bottom */
ref->video->key_frame,
av_get_picture_type_char(ref->video->pict_type));
}
if (ref->audio) {
av_dlog(ctx, " cl:%"PRId64"d n:%d r:%d p:%d",
ref->audio->channel_layout,
ref->audio->nb_samples,
ref->audio->sample_rate,
ref->audio->planar);
}
av_dlog(ctx, "]%s", end ? "\n" : "");
}
static void ff_dlog_link(void *ctx, AVFilterLink *link, int end)
{
if (link->type == AVMEDIA_TYPE_VIDEO) {
av_dlog(ctx,
"link[%p s:%dx%d fmt:%-16s %-16s->%-16s]%s",
link, link->w, link->h,
av_pix_fmt_descriptors[link->format].name,
link->src ? link->src->filter->name : "",
link->dst ? link->dst->filter->name : "",
end ? "\n" : "");
} else {
char buf[128];
av_get_channel_layout_string(buf, sizeof(buf), -1, link->channel_layout);
av_dlog(ctx,
"link[%p r:%"PRId64" cl:%s fmt:%-16s %-16s->%-16s]%s",
link, link->sample_rate, buf,
av_get_sample_fmt_name(link->format),
link->src ? link->src->filter->name : "",
link->dst ? link->dst->filter->name : "",
end ? "\n" : "");
}
}
#define FF_DPRINTF_START(ctx, func) av_dlog(NULL, "%-16s: ", #func)
AVFilterBufferRef *avfilter_get_video_buffer(AVFilterLink *link, int perms, int w, int h)
{
AVFilterBufferRef *ret = NULL;
av_unused char buf[16];
FF_DPRINTF_START(NULL, get_video_buffer); ff_dlog_link(NULL, link, 0);
av_dlog(NULL, " perms:%s w:%d h:%d\n", ff_get_ref_perms_string(buf, sizeof(buf), perms), w, h);
if (link->dstpad->get_video_buffer)
ret = link->dstpad->get_video_buffer(link, perms, w, h);
if (!ret)
ret = avfilter_default_get_video_buffer(link, perms, w, h);
if (ret)
ret->type = AVMEDIA_TYPE_VIDEO;
FF_DPRINTF_START(NULL, get_video_buffer); ff_dlog_link(NULL, link, 0); av_dlog(NULL, " returning "); ff_dlog_ref(NULL, ret, 1);
return ret;
}
AVFilterBufferRef *
avfilter_get_video_buffer_ref_from_arrays(uint8_t * const data[4], const int linesize[4], int perms,
int w, int h, enum PixelFormat format)
{
AVFilterBuffer *pic = av_mallocz(sizeof(AVFilterBuffer));
AVFilterBufferRef *picref = av_mallocz(sizeof(AVFilterBufferRef));
if (!pic || !picref)
goto fail;
picref->buf = pic;
picref->buf->free = ff_avfilter_default_free_buffer;
if (!(picref->video = av_mallocz(sizeof(AVFilterBufferRefVideoProps))))
goto fail;
pic->w = picref->video->w = w;
pic->h = picref->video->h = h;
/* make sure the buffer gets read permission or it's useless for output */
picref->perms = perms | AV_PERM_READ;
pic->refcount = 1;
picref->type = AVMEDIA_TYPE_VIDEO;
pic->format = picref->format = format;
memcpy(pic->data, data, sizeof(pic->data));
memcpy(pic->linesize, linesize, sizeof(pic->linesize));
memcpy(picref->data, pic->data, sizeof(picref->data));
memcpy(picref->linesize, pic->linesize, sizeof(picref->linesize));
return picref;
fail:
if (picref && picref->video)
av_free(picref->video);
av_free(picref);
av_free(pic);
return NULL;
}
AVFilterBufferRef *avfilter_get_audio_buffer(AVFilterLink *link, int perms,
enum AVSampleFormat sample_fmt, int nb_samples,
int64_t channel_layout, int planar)
{
AVFilterBufferRef *ret = NULL;
if (link->dstpad->get_audio_buffer)
ret = link->dstpad->get_audio_buffer(link, perms, sample_fmt, nb_samples, channel_layout, planar);
if (!ret)
ret = avfilter_default_get_audio_buffer(link, perms, sample_fmt, nb_samples, channel_layout, planar);
if (ret)
ret->type = AVMEDIA_TYPE_AUDIO;
return ret;
}
AVFilterBufferRef *
avfilter_get_audio_buffer_ref_from_arrays(uint8_t *data[8], int linesize[8], int perms,
int nb_samples, enum AVSampleFormat sample_fmt,
int64_t channel_layout, int planar)
{
AVFilterBuffer *samples = av_mallocz(sizeof(AVFilterBuffer));
AVFilterBufferRef *samplesref = av_mallocz(sizeof(AVFilterBufferRef));
if (!samples || !samplesref)
goto fail;
samplesref->buf = samples;
samplesref->buf->free = ff_avfilter_default_free_buffer;
if (!(samplesref->audio = av_mallocz(sizeof(AVFilterBufferRefAudioProps))))
goto fail;
samplesref->audio->nb_samples = nb_samples;
samplesref->audio->channel_layout = channel_layout;
samplesref->audio->planar = planar;
/* make sure the buffer gets read permission or it's useless for output */
samplesref->perms = perms | AV_PERM_READ;
samples->refcount = 1;
samplesref->type = AVMEDIA_TYPE_AUDIO;
samplesref->format = sample_fmt;
memcpy(samples->data, data, sizeof(samples->data));
memcpy(samples->linesize, linesize, sizeof(samples->linesize));
memcpy(samplesref->data, data, sizeof(samplesref->data));
memcpy(samplesref->linesize, linesize, sizeof(samplesref->linesize));
return samplesref;
fail:
if (samplesref && samplesref->audio)
av_freep(&samplesref->audio);
av_freep(&samplesref);
av_freep(&samples);
return NULL;
}
int avfilter_request_frame(AVFilterLink *link)
{
FF_DPRINTF_START(NULL, request_frame); ff_dlog_link(NULL, link, 1);
if (link->srcpad->request_frame)
return link->srcpad->request_frame(link);
else if (link->src->inputs[0])
return avfilter_request_frame(link->src->inputs[0]);
else return -1;
}
int avfilter_poll_frame(AVFilterLink *link)
{
int i, min = INT_MAX;
if (link->srcpad->poll_frame)
return link->srcpad->poll_frame(link);
for (i = 0; i < link->src->input_count; i++) {
int val;
if (!link->src->inputs[i])
return -1;
val = avfilter_poll_frame(link->src->inputs[i]);
min = FFMIN(min, val);
}
return min;
}
/* XXX: should we do the duplicating of the picture ref here, instead of
* forcing the source filter to do it? */
void avfilter_start_frame(AVFilterLink *link, AVFilterBufferRef *picref)
{
void (*start_frame)(AVFilterLink *, AVFilterBufferRef *);
AVFilterPad *dst = link->dstpad;
int perms = picref->perms;
AVFilterCommand *cmd= link->dst->command_queue;
FF_DPRINTF_START(NULL, start_frame); ff_dlog_link(NULL, link, 0); av_dlog(NULL, " "); ff_dlog_ref(NULL, picref, 1);
if (!(start_frame = dst->start_frame))
start_frame = avfilter_default_start_frame;
if (picref->linesize[0] < 0)
perms |= AV_PERM_NEG_LINESIZES;
/* prepare to copy the picture if it has insufficient permissions */
if ((dst->min_perms & perms) != dst->min_perms || dst->rej_perms & perms) {
av_log(link->dst, AV_LOG_DEBUG,
"frame copy needed (have perms %x, need %x, reject %x)\n",
picref->perms,
link->dstpad->min_perms, link->dstpad->rej_perms);
link->cur_buf = avfilter_get_video_buffer(link, dst->min_perms, link->w, link->h);
link->src_buf = picref;
avfilter_copy_buffer_ref_props(link->cur_buf, link->src_buf);
}
else
link->cur_buf = picref;
while(cmd && cmd->time <= picref->pts * av_q2d(link->time_base)){
avfilter_process_command(link->dst, cmd->command, cmd->arg, 0, 0, cmd->flags);
command_queue_pop(link->dst);
cmd= link->dst->command_queue;
}
start_frame(link, link->cur_buf);
}
void avfilter_end_frame(AVFilterLink *link)
{
void (*end_frame)(AVFilterLink *);
if (!(end_frame = link->dstpad->end_frame))
end_frame = avfilter_default_end_frame;
end_frame(link);
/* unreference the source picture if we're feeding the destination filter
* a copied version dues to permission issues */
if (link->src_buf) {
avfilter_unref_buffer(link->src_buf);
link->src_buf = NULL;
}
}
void avfilter_draw_slice(AVFilterLink *link, int y, int h, int slice_dir)
{
uint8_t *src[4], *dst[4];
int i, j, vsub;
void (*draw_slice)(AVFilterLink *, int, int, int);
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);
/* copy the slice if needed for permission reasons */
if (link->src_buf) {
vsub = av_pix_fmt_descriptors[link->format].log2_chroma_h;
for (i = 0; i < 4; i++) {
if (link->src_buf->data[i]) {
src[i] = link->src_buf-> data[i] +
(y >> (i==1 || i==2 ? vsub : 0)) * link->src_buf-> linesize[i];
dst[i] = link->cur_buf->data[i] +
(y >> (i==1 || i==2 ? vsub : 0)) * link->cur_buf->linesize[i];
} else
src[i] = dst[i] = NULL;
}
for (i = 0; i < 4; i++) {
int planew =
av_image_get_linesize(link->format, link->cur_buf->video->w, i);
if (!src[i]) continue;
for (j = 0; j < h >> (i==1 || i==2 ? vsub : 0); j++) {
memcpy(dst[i], src[i], planew);
src[i] += link->src_buf->linesize[i];
dst[i] += link->cur_buf->linesize[i];
}
}
}
if (!(draw_slice = link->dstpad->draw_slice))
draw_slice = avfilter_default_draw_slice;
draw_slice(link, y, h, slice_dir);
}
int avfilter_process_command(AVFilterContext *filter, const char *cmd, const char *arg, char *res, int res_len, int flags)
{
if(!strcmp(cmd, "ping")){
av_strlcatf(res, res_len, "pong from:%s %s\n", filter->filter->name, filter->name);
return 0;
}else if(filter->filter->process_command) {
return filter->filter->process_command(filter, cmd, arg, res, res_len, flags);
}
return AVERROR(ENOSYS);
}
void avfilter_filter_samples(AVFilterLink *link, AVFilterBufferRef *samplesref)
{
void (*filter_samples)(AVFilterLink *, AVFilterBufferRef *);
AVFilterPad *dst = link->dstpad;
int i;
FF_DPRINTF_START(NULL, filter_samples); ff_dlog_link(NULL, link, 1);
if (!(filter_samples = dst->filter_samples))
filter_samples = avfilter_default_filter_samples;
/* prepare to copy the samples if the buffer has insufficient permissions */
if ((dst->min_perms & samplesref->perms) != dst->min_perms ||
dst->rej_perms & samplesref->perms) {
av_log(link->dst, AV_LOG_DEBUG,
"Copying audio data in avfilter (have perms %x, need %x, reject %x)\n",
samplesref->perms, link->dstpad->min_perms, link->dstpad->rej_perms);
link->cur_buf = avfilter_default_get_audio_buffer(link, dst->min_perms,
samplesref->format,
samplesref->audio->nb_samples,
samplesref->audio->channel_layout,
samplesref->audio->planar);
link->cur_buf->pts = samplesref->pts;
link->cur_buf->audio->sample_rate = samplesref->audio->sample_rate;
/* Copy actual data into new samples buffer */
for (i = 0; samplesref->data[i]; i++)
memcpy(link->cur_buf->data[i], samplesref->data[i], samplesref->linesize[0]);
avfilter_unref_buffer(samplesref);
} else
link->cur_buf = samplesref;
filter_samples(link, link->cur_buf);
}
#define MAX_REGISTERED_AVFILTERS_NB 64
static AVFilter *registered_avfilters[MAX_REGISTERED_AVFILTERS_NB + 1];
static int next_registered_avfilter_idx = 0;
AVFilter *avfilter_get_by_name(const char *name)
{
int i;
for (i = 0; registered_avfilters[i]; i++)
if (!strcmp(registered_avfilters[i]->name, name))
return registered_avfilters[i];
return NULL;
}
int avfilter_register(AVFilter *filter)
{
if (next_registered_avfilter_idx == MAX_REGISTERED_AVFILTERS_NB)
return -1;
registered_avfilters[next_registered_avfilter_idx++] = filter;
return 0;
}
AVFilter **av_filter_next(AVFilter **filter)
{
return filter ? ++filter : &registered_avfilters[0];
}
void avfilter_uninit(void)
{
memset(registered_avfilters, 0, sizeof(registered_avfilters));
next_registered_avfilter_idx = 0;
}
static int pad_count(const AVFilterPad *pads)
{
int count;
for(count = 0; pads->name; count ++) pads ++;
return count;
}
static const char *filter_name(void *p)
{
AVFilterContext *filter = p;
return filter->filter->name;
}
static const AVClass avfilter_class = {
"AVFilter",
filter_name,
NULL,
LIBAVUTIL_VERSION_INT,
};
int avfilter_open(AVFilterContext **filter_ctx, AVFilter *filter, const char *inst_name)
{
AVFilterContext *ret;
*filter_ctx = NULL;
if (!filter)
return AVERROR(EINVAL);
ret = av_mallocz(sizeof(AVFilterContext));
if (!ret)
return AVERROR(ENOMEM);
ret->av_class = &avfilter_class;
ret->filter = filter;
ret->name = inst_name ? av_strdup(inst_name) : NULL;
if (filter->priv_size) {
ret->priv = av_mallocz(filter->priv_size);
if (!ret->priv)
goto err;
}
ret->input_count = pad_count(filter->inputs);
if (ret->input_count) {
ret->input_pads = av_malloc(sizeof(AVFilterPad) * ret->input_count);
if (!ret->input_pads)
goto err;
memcpy(ret->input_pads, filter->inputs, sizeof(AVFilterPad) * ret->input_count);
ret->inputs = av_mallocz(sizeof(AVFilterLink*) * ret->input_count);
if (!ret->inputs)
goto err;
}
ret->output_count = pad_count(filter->outputs);
if (ret->output_count) {
ret->output_pads = av_malloc(sizeof(AVFilterPad) * ret->output_count);
if (!ret->output_pads)
goto err;
memcpy(ret->output_pads, filter->outputs, sizeof(AVFilterPad) * ret->output_count);
ret->outputs = av_mallocz(sizeof(AVFilterLink*) * ret->output_count);
if (!ret->outputs)
goto err;
}
*filter_ctx = ret;
return 0;
err:
av_freep(&ret->inputs);
av_freep(&ret->input_pads);
ret->input_count = 0;
av_freep(&ret->outputs);
av_freep(&ret->output_pads);
ret->output_count = 0;
av_freep(&ret->priv);
av_free(ret);
return AVERROR(ENOMEM);
}
void avfilter_free(AVFilterContext *filter)
{
int i;
AVFilterLink *link;
if (filter->filter->uninit)
filter->filter->uninit(filter);
for (i = 0; i < filter->input_count; i++) {
if ((link = filter->inputs[i])) {
if (link->src)
link->src->outputs[link->srcpad - link->src->output_pads] = NULL;
avfilter_formats_unref(&link->in_formats);
avfilter_formats_unref(&link->out_formats);
}
avfilter_link_free(&link);
}
for (i = 0; i < filter->output_count; i++) {
if ((link = filter->outputs[i])) {
if (link->dst)
link->dst->inputs[link->dstpad - link->dst->input_pads] = NULL;
avfilter_formats_unref(&link->in_formats);
avfilter_formats_unref(&link->out_formats);
}
avfilter_link_free(&link);
}
av_freep(&filter->name);
av_freep(&filter->input_pads);
av_freep(&filter->output_pads);
av_freep(&filter->inputs);
av_freep(&filter->outputs);
av_freep(&filter->priv);
while(filter->command_queue){
command_queue_pop(filter);
}
av_free(filter);
}
int avfilter_init_filter(AVFilterContext *filter, const char *args, void *opaque)
{
int ret=0;
if (filter->filter->init)
ret = filter->filter->init(filter, args, opaque);
return ret;
}
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