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lavfi: add types and functions for channel layout/samplerate negotiation

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This commit is contained in:
Anton Khirnov 2012-05-06 06:59:06 +02:00
parent 394a0267ab
commit 5775a1832c
3 changed files with 305 additions and 81 deletions
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16
libavfilter/avfilter.h
View File

@ -618,6 +618,22 @@ struct AVFilterLink {
* input link is assumed to be an unchangeable property.
*/
AVRational time_base;
/*****************************************************************
* All fields below this line are not part of the public API. They
* may not be used outside of libavfilter and can be changed and
* removed at will.
* New public fields should be added right above.
*****************************************************************
*/
/**
* Lists of channel layouts and sample rates used for automatic
* negotiation.
*/
AVFilterFormats *in_samplerates;
AVFilterFormats *out_samplerates;
struct AVFilterChannelLayouts *in_channel_layouts;
struct AVFilterChannelLayouts *out_channel_layouts;
};
/**

292
libavfilter/formats.c
View File

@ -22,58 +22,132 @@
#include "libavutil/pixdesc.h"
#include "avfilter.h"
#include "internal.h"
#include "formats.h"
/**
* Add all refs from a to ret and destroy a.
*/
static void merge_ref(AVFilterFormats *ret, AVFilterFormats *a)
{
int i;
#define MERGE_REF(ret, a, fmts, type, fail) \
do { \
type ***tmp; \
int i; \
\
if (!(tmp = av_realloc(ret->refs, \
sizeof(*tmp) * (ret->refcount + a->refcount)))) \
goto fail; \
ret->refs = tmp; \
\
for (i = 0; i < a->refcount; i ++) { \
ret->refs[ret->refcount] = a->refs[i]; \
*ret->refs[ret->refcount++] = ret; \
} \
\
av_freep(&a->refs); \
av_freep(&a->fmts); \
av_freep(&a); \
} while (0)
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);
}
/**
* Add all formats common for a and b to ret, copy the refs and destroy
* a and b.
*/
#define MERGE_FORMATS(ret, a, b, fmts, nb, type, fail) \
do { \
int i, j, k = 0, count = FFMIN(a->nb, b->nb); \
\
if (!(ret = av_mallocz(sizeof(*ret)))) \
goto fail; \
\
if (count) { \
if (!(ret->fmts = av_malloc(sizeof(*ret->fmts) * count))) \
goto fail; \
for (i = 0; i < a->nb; i++) \
for (j = 0; j < b->nb; j++) \
if (a->fmts[i] == b->fmts[j]) \
ret->fmts[k++] = a->fmts[i]; \
\
ret->nb = k; \
} \
/* check that there was at least one common format */ \
if (!ret->nb) \
goto fail; \
\
MERGE_REF(ret, a, fmts, type, fail); \
MERGE_REF(ret, b, fmts, type, fail); \
} while (0)
AVFilterFormats *avfilter_merge_formats(AVFilterFormats *a, AVFilterFormats *b)
{
AVFilterFormats *ret;
unsigned i, j, k = 0, m_count;
AVFilterFormats *ret = NULL;
if (a == b)
return a;
ret = av_mallocz(sizeof(*ret));
/* merge list of formats */
m_count = FFMIN(a->format_count, b->format_count);
if (m_count) {
ret->formats = av_malloc(sizeof(*ret->formats) * m_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(*ret->refs) * (a->refcount + b->refcount));
merge_ref(ret, a);
merge_ref(ret, b);
MERGE_FORMATS(ret, a, b, formats, format_count, AVFilterFormats, fail);
return ret;
fail:
if (ret) {
av_freep(&ret->refs);
av_freep(&ret->formats);
}
av_freep(&ret);
return NULL;
}
AVFilterFormats *ff_merge_samplerates(AVFilterFormats *a,
AVFilterFormats *b)
{
AVFilterFormats *ret = NULL;
if (a == b) return a;
if (a->format_count && b->format_count) {
MERGE_FORMATS(ret, a, b, formats, format_count, AVFilterFormats, fail);
} else if (a->format_count) {
MERGE_REF(a, b, formats, AVFilterFormats, fail);
ret = a;
} else {
MERGE_REF(b, a, formats, AVFilterFormats, fail);
ret = b;
}
return ret;
fail:
if (ret) {
av_freep(&ret->refs);
av_freep(&ret->formats);
}
av_freep(&ret);
return NULL;
}
AVFilterChannelLayouts *ff_merge_channel_layouts(AVFilterChannelLayouts *a,
AVFilterChannelLayouts *b)
{
AVFilterChannelLayouts *ret = NULL;
if (a == b) return a;
if (a->nb_channel_layouts && b->nb_channel_layouts) {
MERGE_FORMATS(ret, a, b, channel_layouts, nb_channel_layouts,
AVFilterChannelLayouts, fail);
} else if (a->nb_channel_layouts) {
MERGE_REF(a, b, channel_layouts, AVFilterChannelLayouts, fail);
ret = a;
} else {
MERGE_REF(b, a, channel_layouts, AVFilterChannelLayouts, fail);
ret = b;
}
return ret;
fail:
if (ret) {
av_freep(&ret->refs);
av_freep(&ret->channel_layouts);
}
av_freep(&ret);
return NULL;
}
int ff_fmt_is_in(int fmt, const int *fmts)
@ -104,21 +178,31 @@ AVFilterFormats *avfilter_make_format_list(const int *fmts)
return formats;
}
#define ADD_FORMAT(f, fmt, type, list, nb) \
do { \
type *fmts; \
\
if (!(*f) && !(*f = av_mallocz(sizeof(**f)))) \
return AVERROR(ENOMEM); \
\
fmts = av_realloc((*f)->list, \
sizeof(*(*f)->list) * ((*f)->nb + 1));\
if (!fmts) \
return AVERROR(ENOMEM); \
\
(*f)->list = fmts; \
(*f)->list[(*f)->nb++] = fmt; \
return 0; \
} while (0)
int avfilter_add_format(AVFilterFormats **avff, int fmt)
{
int *fmts;
ADD_FORMAT(avff, fmt, int, formats, format_count);
}
if (!(*avff) && !(*avff = av_mallocz(sizeof(**avff))))
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;
int ff_add_channel_layout(AVFilterChannelLayouts **l, uint64_t channel_layout)
{
ADD_FORMAT(l, channel_layout, uint64_t, channel_layouts, nb_channel_layouts);
}
AVFilterFormats *avfilter_all_formats(enum AVMediaType type)
@ -136,51 +220,97 @@ AVFilterFormats *avfilter_all_formats(enum AVMediaType type)
return ret;
}
void avfilter_formats_ref(AVFilterFormats *f, AVFilterFormats **ref)
AVFilterFormats *ff_all_samplerates(void)
{
*ref = f;
f->refs = av_realloc(f->refs, sizeof(*f->refs) * ++f->refcount);
f->refs[f->refcount-1] = ref;
AVFilterFormats *ret = av_mallocz(sizeof(*ret));
return ret;
}
static int find_ref_index(AVFilterFormats **ref)
AVFilterChannelLayouts *ff_all_channel_layouts(void)
{
int i;
for(i = 0; i < (*ref)->refcount; i ++)
if((*ref)->refs[i] == ref)
return i;
return -1;
AVFilterChannelLayouts *ret = av_mallocz(sizeof(*ret));
return ret;
}
#define FORMATS_REF(f, ref) \
do { \
*ref = f; \
f->refs = av_realloc(f->refs, sizeof(*f->refs) * ++f->refcount); \
f->refs[f->refcount-1] = ref; \
} while (0)
void ff_channel_layouts_ref(AVFilterChannelLayouts *f, AVFilterChannelLayouts **ref)
{
FORMATS_REF(f, ref);
}
void avfilter_formats_ref(AVFilterFormats *f, AVFilterFormats **ref)
{
FORMATS_REF(f, ref);
}
#define FIND_REF_INDEX(ref, idx) \
do { \
int i; \
for (i = 0; i < (*ref)->refcount; i ++) \
if((*ref)->refs[i] == ref) { \
idx = i; \
break; \
} \
} while (0)
#define FORMATS_UNREF(ref, list) \
do { \
int idx = -1; \
\
if (!*ref) \
return; \
\
FIND_REF_INDEX(ref, idx); \
\
if (idx >= 0) \
memmove((*ref)->refs + idx, (*ref)->refs + idx + 1, \
sizeof(*(*ref)->refs) * ((*ref)->refcount - idx - 1)); \
\
if(!--(*ref)->refcount) { \
av_free((*ref)->list); \
av_free((*ref)->refs); \
av_free(*ref); \
} \
*ref = NULL; \
} while (0)
void avfilter_formats_unref(AVFilterFormats **ref)
{
int idx;
FORMATS_UNREF(ref, formats);
}
if (!*ref)
return;
void ff_channel_layouts_unref(AVFilterChannelLayouts **ref)
{
FORMATS_UNREF(ref, channel_layouts);
}
idx = find_ref_index(ref);
#define FORMATS_CHANGEREF(oldref, newref) \
do { \
int idx = -1; \
\
FIND_REF_INDEX(oldref, idx); \
\
if (idx >= 0) { \
(*oldref)->refs[idx] = newref; \
*newref = *oldref; \
*oldref = NULL; \
} \
} while (0)
if(idx >= 0)
memmove((*ref)->refs + idx, (*ref)->refs + idx + 1,
sizeof(*(*ref)->refs) * ((*ref)->refcount - idx - 1));
if(!--(*ref)->refcount) {
av_free((*ref)->formats);
av_free((*ref)->refs);
av_free(*ref);
}
*ref = NULL;
void ff_channel_layouts_changeref(AVFilterChannelLayouts **oldref,
AVFilterChannelLayouts **newref)
{
FORMATS_CHANGEREF(oldref, newref);
}
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;
}
FORMATS_CHANGEREF(oldref, newref);
}

78
libavfilter/formats.h Normal file
View File

@ -0,0 +1,78 @@
/*
* 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
*/
#ifndef AVFILTER_FORMATS_H
#define AVFILTER_FORMATS_H
#include "avfilter.h"
typedef struct AVFilterChannelLayouts {
uint64_t *channel_layouts; ///< list of channel layouts
int nb_channel_layouts; ///< number of channel layouts
unsigned refcount; ///< number of references to this list
struct AVFilterChannelLayouts ***refs; ///< references to this list
} AVFilterChannelLayouts;
/**
* Return a channel layouts/samplerates list which contains the intersection of
* the layouts/samplerates of a and b. Also, all the references of a, all the
* references of b, and a and b themselves will be deallocated.
*
* If a and b do not share any common elements, neither is modified, and NULL
* is returned.
*/
AVFilterChannelLayouts *ff_merge_channel_layouts(AVFilterChannelLayouts *a,
AVFilterChannelLayouts *b);
AVFilterFormats *ff_merge_samplerates(AVFilterFormats *a,
AVFilterFormats *b);
/**
* Construct an empty AVFilterChannelLayouts/AVFilterFormats struct --
* representing any channel layout/sample rate.
*/
AVFilterChannelLayouts *ff_all_channel_layouts(void);
AVFilterFormats *ff_all_samplerates(void);
/**
* A helper for query_formats() which sets all links to the same list of channel
* layouts/sample rates. If there are no links hooked to this filter, the list
* is freed.
*/
void ff_set_common_channel_layouts(AVFilterContext *ctx,
AVFilterChannelLayouts *layouts);
void ff_set_common_samplerates(AVFilterContext *ctx,
AVFilterFormats *samplerates);
int ff_add_channel_layout(AVFilterChannelLayouts **l, uint64_t channel_layout);
/**
* Add *ref as a new reference to f.
*/
void ff_channel_layouts_ref(AVFilterChannelLayouts *f,
AVFilterChannelLayouts **ref);
/**
* Remove a reference to a channel layouts list.
*/
void ff_channel_layouts_unref(AVFilterChannelLayouts **ref);
void ff_channel_layouts_changeref(AVFilterChannelLayouts **oldref,
AVFilterChannelLayouts **newref);
#endif // AVFILTER_FORMATS_H