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ffmpeg/libavfilter/avfilter.c

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/*
* filter layer
* Copyright (c) 2007 Bobby Bingham
*
* This file is part of Libav.
*
* Libav 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.
*
* Libav 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 Libav; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/* #define DEBUG */
#include "libavutil/avstring.h"
#include "libavutil/channel_layout.h"
#include "libavutil/common.h"
#include "libavutil/imgutils.h"
#include "libavutil/opt.h"
#include "libavutil/pixdesc.h"
#include "libavutil/rational.h"
#include "libavutil/samplefmt.h"
#include "audio.h"
#include "avfilter.h"
#include "formats.h"
#include "internal.h"
#include "video.h"
unsigned avfilter_version(void) {
return LIBAVFILTER_VERSION_INT;
}
const char *avfilter_configuration(void)
{
return LIBAV_CONFIGURATION;
}
const char *avfilter_license(void)
{
#define LICENSE_PREFIX "libavfilter license: "
return LICENSE_PREFIX LIBAV_LICENSE + sizeof(LICENSE_PREFIX) - 1;
}
void ff_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->nb_outputs <= srcpad || dst->nb_inputs <= 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(AV_PIX_FMT_NONE == -1 && AV_SAMPLE_FMT_NONE == -1);
link->format = -1;
return 0;
}
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_VERBOSE, "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)
ff_formats_changeref(&link->out_formats,
&filt->outputs[filt_dstpad_idx]->out_formats);
if (link->out_samplerates)
ff_formats_changeref(&link->out_samplerates,
&filt->outputs[filt_dstpad_idx]->out_samplerates);
if (link->out_channel_layouts)
ff_channel_layouts_changeref(&link->out_channel_layouts,
&filt->outputs[filt_dstpad_idx]->out_channel_layouts);
return 0;
}
int avfilter_config_links(AVFilterContext *filter)
{
int (*config_link)(AVFilterLink *);
unsigned i;
int ret;
for (i = 0; i < filter->nb_inputs; 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->nb_inputs != 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) {
av_log(link->src, AV_LOG_ERROR,
"Failed to configure output pad on %s\n",
link->src->name);
return ret;
}
if (link->time_base.num == 0 && link->time_base.den == 0)
link->time_base = link->src && link->src->nb_inputs ?
link->src->inputs[0]->time_base : AV_TIME_BASE_Q;
if (link->type == AVMEDIA_TYPE_VIDEO) {
if (!link->sample_aspect_ratio.num && !link->sample_aspect_ratio.den)
link->sample_aspect_ratio = link->src->nb_inputs ?
link->src->inputs[0]->sample_aspect_ratio : (AVRational){1,1};
if (link->src->nb_inputs) {
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);
}
}
if ((config_link = link->dstpad->config_props))
if ((ret = config_link(link)) < 0) {
av_log(link->src, AV_LOG_ERROR,
"Failed to configure input pad on %s\n",
link->dst->name);
return ret;
}
link->init_state = AVLINK_INIT;
}
}
return 0;
}
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_get_pix_fmt_name(link->format),
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:%d 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" : "");
}
}
int ff_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 ff_request_frame(link->src->inputs[0]);
else return -1;
}
int ff_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->nb_inputs; i++) {
int val;
if (!link->src->inputs[i])
return -1;
val = ff_poll_frame(link->src->inputs[i]);
min = FFMIN(min, val);
}
return min;
}
static AVFilter *first_filter;
AVFilter *avfilter_get_by_name(const char *name)
{
AVFilter *f = NULL;
if (!name)
return NULL;
while ((f = avfilter_next(f)))
if (!strcmp(f->name, name))
return f;
return NULL;
}
int avfilter_register(AVFilter *filter)
{
AVFilter **f = &first_filter;
while (*f)
f = &(*f)->next;
*f = filter;
filter->next = NULL;
return 0;
}
const AVFilter *avfilter_next(const AVFilter *prev)
{
return prev ? prev->next : first_filter;
}
#if FF_API_OLD_FILTER_REGISTER
AVFilter **av_filter_next(AVFilter **filter)
{
return filter ? &(*filter)->next : &first_filter;
}
void avfilter_uninit(void)
{
}
#endif
int avfilter_pad_count(const AVFilterPad *pads)
{
int count;
if (!pads)
return 0;
for(count = 0; pads->name; count ++) pads ++;
return count;
}
static const char *filter_name(void *p)
{
AVFilterContext *filter = p;
return filter->filter->name;
}
static void *filter_child_next(void *obj, void *prev)
{
AVFilterContext *ctx = obj;
if (!prev && ctx->filter && ctx->filter->priv_class && ctx->priv)
return ctx->priv;
return NULL;
}
static const AVClass *filter_child_class_next(const AVClass *prev)
{
AVFilter *f = NULL;
while (prev && (f = avfilter_next(f)))
if (f->priv_class == prev)
break;
while ((f = avfilter_next(f)))
if (f->priv_class)
return f->priv_class;
return NULL;
}
static const AVClass avfilter_class = {
.class_name = "AVFilter",
.item_name = filter_name,
.version = LIBAVUTIL_VERSION_INT,
.child_next = filter_child_next,
.child_class_next = filter_child_class_next,
};
AVFilterContext *ff_filter_alloc(const AVFilter *filter, const char *inst_name)
{
AVFilterContext *ret;
if (!filter)
return NULL;
ret = av_mallocz(sizeof(AVFilterContext));
if (!ret)
return NULL;
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;
}
if (filter->priv_class) {
*(const AVClass**)ret->priv = filter->priv_class;
av_opt_set_defaults(ret->priv);
}
ret->nb_inputs = avfilter_pad_count(filter->inputs);
if (ret->nb_inputs ) {
ret->input_pads = av_malloc(sizeof(AVFilterPad) * ret->nb_inputs);
if (!ret->input_pads)
goto err;
memcpy(ret->input_pads, filter->inputs, sizeof(AVFilterPad) * ret->nb_inputs);
ret->inputs = av_mallocz(sizeof(AVFilterLink*) * ret->nb_inputs);
if (!ret->inputs)
goto err;
}
ret->nb_outputs = avfilter_pad_count(filter->outputs);
if (ret->nb_outputs) {
ret->output_pads = av_malloc(sizeof(AVFilterPad) * ret->nb_outputs);
if (!ret->output_pads)
goto err;
memcpy(ret->output_pads, filter->outputs, sizeof(AVFilterPad) * ret->nb_outputs);
ret->outputs = av_mallocz(sizeof(AVFilterLink*) * ret->nb_outputs);
if (!ret->outputs)
goto err;
}
#if FF_API_FOO_COUNT
ret->output_count = ret->nb_outputs;
ret->input_count = ret->nb_inputs;
#endif
return ret;
err:
av_freep(&ret->inputs);
av_freep(&ret->input_pads);
ret->nb_inputs = 0;
av_freep(&ret->outputs);
av_freep(&ret->output_pads);
ret->nb_outputs = 0;
av_freep(&ret->priv);
av_free(ret);
return NULL;
}
#if FF_API_AVFILTER_OPEN
int avfilter_open(AVFilterContext **filter_ctx, AVFilter *filter, const char *inst_name)
{
*filter_ctx = ff_filter_alloc(filter, inst_name);
return *filter_ctx ? 0 : AVERROR(ENOMEM);
}
#endif
void avfilter_free(AVFilterContext *filter)
{
int i;
AVFilterLink *link;
if (filter->graph)
ff_filter_graph_remove_filter(filter->graph, filter);
if (filter->filter->uninit)
filter->filter->uninit(filter);
for (i = 0; i < filter->nb_inputs; i++) {
if ((link = filter->inputs[i])) {
if (link->src)
link->src->outputs[link->srcpad - link->src->output_pads] = NULL;
ff_formats_unref(&link->in_formats);
ff_formats_unref(&link->out_formats);
ff_formats_unref(&link->in_samplerates);
ff_formats_unref(&link->out_samplerates);
ff_channel_layouts_unref(&link->in_channel_layouts);
ff_channel_layouts_unref(&link->out_channel_layouts);
}
av_freep(&link);
}
for (i = 0; i < filter->nb_outputs; i++) {
if ((link = filter->outputs[i])) {
if (link->dst)
link->dst->inputs[link->dstpad - link->dst->input_pads] = NULL;
ff_formats_unref(&link->in_formats);
ff_formats_unref(&link->out_formats);
ff_formats_unref(&link->in_samplerates);
ff_formats_unref(&link->out_samplerates);
ff_channel_layouts_unref(&link->in_channel_layouts);
ff_channel_layouts_unref(&link->out_channel_layouts);
}
av_freep(&link);
}
if (filter->filter->priv_class)
av_opt_free(filter->priv);
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);
av_free(filter);
}
/* process a list of value1:value2:..., each value corresponding
* to subsequent AVOption, in the order they are declared */
static int process_unnamed_options(AVFilterContext *ctx, AVDictionary **options,
const char *args)
{
const AVOption *o = NULL;
const char *p = args;
char *val;
while (*p) {
o = av_opt_next(ctx->priv, o);
if (!o) {
av_log(ctx, AV_LOG_ERROR, "More options provided than "
"this filter supports.\n");
return AVERROR(EINVAL);
}
if (o->type == AV_OPT_TYPE_CONST)
continue;
val = av_get_token(&p, ":");
if (!val)
return AVERROR(ENOMEM);
av_dict_set(options, o->name, val, 0);
av_freep(&val);
if (*p)
p++;
}
return 0;
}
#if FF_API_AVFILTER_INIT_FILTER
int avfilter_init_filter(AVFilterContext *filter, const char *args, void *opaque)
{
return avfilter_init_str(filter, args);
}
#endif
int avfilter_init_dict(AVFilterContext *ctx, AVDictionary **options)
{
int ret = 0;
if (ctx->filter->priv_class) {
ret = av_opt_set_dict(ctx->priv, options);
if (ret < 0) {
av_log(ctx, AV_LOG_ERROR, "Error applying options to the filter.\n");
return ret;
}
}
if (ctx->filter->init)
ret = ctx->filter->init(ctx);
else if (ctx->filter->init_dict)
ret = ctx->filter->init_dict(ctx, options);
return ret;
}
int avfilter_init_str(AVFilterContext *filter, const char *args)
{
AVDictionary *options = NULL;
AVDictionaryEntry *e;
int ret=0;
if (args && *args) {
if (!filter->filter->priv_class) {
av_log(filter, AV_LOG_ERROR, "This filter does not take any "
"options, but options were provided: %s.\n", args);
return AVERROR(EINVAL);
}
#if FF_API_OLD_FILTER_OPTS
if (!strcmp(filter->filter->name, "scale") &&
strchr(args, ':') < strchr(args, '=')) {
/* old w:h:flags=<flags> syntax */
char *copy = av_strdup(args);
char *p;
av_log(filter, AV_LOG_WARNING, "The <w>:<h>:flags=<flags> option "
"syntax is deprecated. Use either <w>:<h>:<flags> or "
"w=<w>:h=<h>:flags=<flags>.\n");
if (!copy) {
ret = AVERROR(ENOMEM);
goto fail;
}
p = strrchr(copy, ':');
if (p) {
*p++ = 0;
ret = av_dict_parse_string(&options, p, "=", ":", 0);
}
if (ret >= 0)
ret = process_unnamed_options(filter, &options, copy);
av_freep(&copy);
if (ret < 0)
goto fail;
} else
#endif
if (strchr(args, '=')) {
/* assume a list of key1=value1:key2=value2:... */
ret = av_dict_parse_string(&options, args, "=", ":", 0);
if (ret < 0)
goto fail;
#if FF_API_OLD_FILTER_OPTS
} else if (!strcmp(filter->filter->name, "format") ||
!strcmp(filter->filter->name, "noformat") ||
!strcmp(filter->filter->name, "frei0r") ||
!strcmp(filter->filter->name, "frei0r_src") ||
!strcmp(filter->filter->name, "ocv")) {
/* a hack for compatibility with the old syntax
* replace colons with |s */
char *copy = av_strdup(args);
char *p = copy;
int nb_leading = 0; // number of leading colons to skip
if (!copy) {
ret = AVERROR(ENOMEM);
goto fail;
}
if (!strcmp(filter->filter->name, "frei0r") ||
!strcmp(filter->filter->name, "ocv"))
nb_leading = 1;
else if (!strcmp(filter->filter->name, "frei0r_src"))
nb_leading = 3;
while (nb_leading--) {
p = strchr(p, ':');
if (!p) {
p = copy + strlen(copy);
break;
}
p++;
}
if (strchr(p, ':')) {
av_log(filter, AV_LOG_WARNING, "This syntax is deprecated. Use "
"'|' to separate the list items.\n");
}
while ((p = strchr(p, ':')))
*p++ = '|';
ret = process_unnamed_options(filter, &options, copy);
av_freep(&copy);
if (ret < 0)
goto fail;
#endif
} else {
ret = process_unnamed_options(filter, &options, args);
if (ret < 0)
goto fail;
}
}
ret = avfilter_init_dict(filter, &options);
if (ret < 0)
goto fail;
if ((e = av_dict_get(options, "", NULL, AV_DICT_IGNORE_SUFFIX))) {
av_log(filter, AV_LOG_ERROR, "No such option: %s.\n", e->key);
ret = AVERROR_OPTION_NOT_FOUND;
goto fail;
}
fail:
av_dict_free(&options);
return ret;
}
const char *avfilter_pad_get_name(const AVFilterPad *pads, int pad_idx)
{
return pads[pad_idx].name;
}
enum AVMediaType avfilter_pad_get_type(const AVFilterPad *pads, int pad_idx)
{
return pads[pad_idx].type;
}
static int default_filter_frame(AVFilterLink *link, AVFrame *frame)
{
return ff_filter_frame(link->dst->outputs[0], frame);
}
int ff_filter_frame(AVFilterLink *link, AVFrame *frame)
{
int (*filter_frame)(AVFilterLink *, AVFrame *);
AVFilterPad *dst = link->dstpad;
AVFrame *out;
FF_DPRINTF_START(NULL, filter_frame);
ff_dlog_link(NULL, link, 1);
if (!(filter_frame = dst->filter_frame))
filter_frame = default_filter_frame;
/* copy the frame if needed */
if (dst->needs_writable && !av_frame_is_writable(frame)) {
av_log(link->dst, AV_LOG_DEBUG, "Copying data in avfilter.\n");
switch (link->type) {
case AVMEDIA_TYPE_VIDEO:
out = ff_get_video_buffer(link, link->w, link->h);
break;
case AVMEDIA_TYPE_AUDIO:
out = ff_get_audio_buffer(link, frame->nb_samples);
break;
default: return AVERROR(EINVAL);
}
if (!out) {
av_frame_free(&frame);
return AVERROR(ENOMEM);
}
av_frame_copy_props(out, frame);
switch (link->type) {
case AVMEDIA_TYPE_VIDEO:
av_image_copy(out->data, out->linesize, frame->data, frame->linesize,
frame->format, frame->width, frame->height);
break;
case AVMEDIA_TYPE_AUDIO:
av_samples_copy(out->extended_data, frame->extended_data,
0, 0, frame->nb_samples,
av_get_channel_layout_nb_channels(frame->channel_layout),
frame->format);
break;
default: return AVERROR(EINVAL);
}
av_frame_free(&frame);
} else
out = frame;
return filter_frame(link, out);
}
const AVClass *avfilter_get_class(void)
{
return &avfilter_class;
}
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