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/*
* Filter layer - format negotiation
* 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
*/
#include "libavutil/pixdesc.h"
#include "avfilter.h"
/**
* Add all refs from a to ret and destroy a.
*/
static void merge_ref(AVFilterFormats *ret, AVFilterFormats *a)
{
int i;
for(i = 0; i < a->refcount; i ++) {
ret->refs[ret->refcount] = a->refs[i];
*ret->refs[ret->refcount++] = ret;
}
av_free(a->refs);
av_free(a->formats);
av_free(a);
}
AVFilterFormats *avfilter_merge_formats(AVFilterFormats *a, AVFilterFormats *b)
{
AVFilterFormats *ret;
unsigned i, j, k = 0;
ret = av_mallocz(sizeof(AVFilterFormats));
/* merge list of formats */
ret->formats = av_malloc(sizeof(*ret->formats) * FFMIN(a->format_count,
b->format_count));
for(i = 0; i < a->format_count; i ++)
for(j = 0; j < b->format_count; j ++)
if(a->formats[i] == b->formats[j])
ret->formats[k++] = a->formats[i];
ret->format_count = k;
/* check that there was at least one common format */
if(!ret->format_count) {
av_free(ret->formats);
av_free(ret);
return NULL;
}
ret->refs = av_malloc(sizeof(AVFilterFormats**)*(a->refcount+b->refcount));
merge_ref(ret, a);
merge_ref(ret, b);
return ret;
}
AVFilterFormats *avfilter_make_format_list(const int *fmts)
{
AVFilterFormats *formats;
int count = 0;
if (fmts)
for (count = 0; fmts[count] != -1; count++)
;
formats = av_mallocz(sizeof(AVFilterFormats));
formats->format_count = count;
if (count) {
formats->formats = av_malloc(sizeof(*formats->formats) * count);
memcpy(formats->formats, fmts, sizeof(*formats->formats) * count);
}
return formats;
}
int avfilter_add_format(AVFilterFormats **avff, int fmt)
{
int *fmts;
if (!(*avff) && !(*avff = av_mallocz(sizeof(AVFilterFormats))))
return AVERROR(ENOMEM);
fmts = av_realloc((*avff)->formats,
sizeof((*avff)->formats) * ((*avff)->format_count+1));
if (!fmts)
return AVERROR(ENOMEM);
(*avff)->formats = fmts;
(*avff)->formats[(*avff)->format_count++] = fmt;
return 0;
}
AVFilterFormats *avfilter_all_formats(enum AVMediaType type)
{
AVFilterFormats *ret = NULL;
int fmt;
int num_formats = type == AVMEDIA_TYPE_VIDEO ? PIX_FMT_NB :
type == AVMEDIA_TYPE_AUDIO ? AV_SAMPLE_FMT_NB : 0;
for (fmt = 0; fmt < num_formats; fmt++)
if ((type != AVMEDIA_TYPE_VIDEO) ||
(type == AVMEDIA_TYPE_VIDEO && !(av_pix_fmt_descriptors[fmt].flags & PIX_FMT_HWACCEL)))
avfilter_add_format(&ret, fmt);
return ret;
}
void avfilter_formats_ref(AVFilterFormats *f, AVFilterFormats **ref)
{
*ref = f;
f->refs = av_realloc(f->refs, sizeof(AVFilterFormats**) * ++f->refcount);
f->refs[f->refcount-1] = ref;
}
static int find_ref_index(AVFilterFormats **ref)
{
int i;
for(i = 0; i < (*ref)->refcount; i ++)
if((*ref)->refs[i] == ref)
return i;
return -1;
}
void avfilter_formats_unref(AVFilterFormats **ref)
{
int idx;
if (!*ref)
return;
idx = find_ref_index(ref);
if(idx >= 0)
memmove((*ref)->refs + idx, (*ref)->refs + idx+1,
sizeof(AVFilterFormats**) * ((*ref)->refcount-idx-1));
if(!--(*ref)->refcount) {
av_free((*ref)->formats);
av_free((*ref)->refs);
av_free(*ref);
}
*ref = NULL;
}
void avfilter_formats_changeref(AVFilterFormats **oldref,
AVFilterFormats **newref)
{
int idx = find_ref_index(oldref);
if(idx >= 0) {
(*oldref)->refs[idx] = newref;
*newref = *oldref;
*oldref = NULL;
}
}
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