mirror of
https://github.com/FFmpeg/FFmpeg.git
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409 lines
15 KiB
C
409 lines
15 KiB
C
/*
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* Filter layer - format negotiation
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* Copyright (c) 2007 Bobby Bingham
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*
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* This file is part of Libav.
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*
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* Libav is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* Libav is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with Libav; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "libavutil/common.h"
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#include "libavutil/pixdesc.h"
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#include "avfilter.h"
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#include "internal.h"
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#include "formats.h"
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/**
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* Add all refs from a to ret and destroy a.
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*/
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#define MERGE_REF(ret, a, fmts, type, fail) \
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do { \
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type ***tmp; \
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int i; \
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\
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if (!(tmp = av_realloc(ret->refs, \
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sizeof(*tmp) * (ret->refcount + a->refcount)))) \
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goto fail; \
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ret->refs = tmp; \
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\
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for (i = 0; i < a->refcount; i ++) { \
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ret->refs[ret->refcount] = a->refs[i]; \
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*ret->refs[ret->refcount++] = ret; \
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} \
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\
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av_freep(&a->refs); \
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av_freep(&a->fmts); \
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av_freep(&a); \
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} while (0)
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/**
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* Add all formats common for a and b to ret, copy the refs and destroy
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* a and b.
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*/
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#define MERGE_FORMATS(ret, a, b, fmts, nb, type, fail) \
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do { \
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int i, j, k = 0, count = FFMIN(a->nb, b->nb); \
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\
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if (!(ret = av_mallocz(sizeof(*ret)))) \
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goto fail; \
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\
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if (count) { \
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if (!(ret->fmts = av_malloc(sizeof(*ret->fmts) * count))) \
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goto fail; \
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for (i = 0; i < a->nb; i++) \
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for (j = 0; j < b->nb; j++) \
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if (a->fmts[i] == b->fmts[j]) \
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ret->fmts[k++] = a->fmts[i]; \
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\
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ret->nb = k; \
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} \
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/* check that there was at least one common format */ \
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if (!ret->nb) \
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goto fail; \
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\
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MERGE_REF(ret, a, fmts, type, fail); \
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MERGE_REF(ret, b, fmts, type, fail); \
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} while (0)
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AVFilterFormats *ff_merge_formats(AVFilterFormats *a, AVFilterFormats *b)
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{
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AVFilterFormats *ret = NULL;
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if (a == b)
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return a;
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MERGE_FORMATS(ret, a, b, formats, nb_formats, AVFilterFormats, fail);
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return ret;
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fail:
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if (ret) {
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av_freep(&ret->refs);
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av_freep(&ret->formats);
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}
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av_freep(&ret);
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return NULL;
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}
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AVFilterFormats *ff_merge_samplerates(AVFilterFormats *a,
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AVFilterFormats *b)
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{
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AVFilterFormats *ret = NULL;
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if (a == b) return a;
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if (a->nb_formats && b->nb_formats) {
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MERGE_FORMATS(ret, a, b, formats, nb_formats, AVFilterFormats, fail);
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} else if (a->nb_formats) {
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MERGE_REF(a, b, formats, AVFilterFormats, fail);
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ret = a;
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} else {
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MERGE_REF(b, a, formats, AVFilterFormats, fail);
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ret = b;
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}
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return ret;
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fail:
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if (ret) {
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av_freep(&ret->refs);
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av_freep(&ret->formats);
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}
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av_freep(&ret);
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return NULL;
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}
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AVFilterChannelLayouts *ff_merge_channel_layouts(AVFilterChannelLayouts *a,
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AVFilterChannelLayouts *b)
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{
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AVFilterChannelLayouts *ret = NULL;
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if (a == b) return a;
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if (a->nb_channel_layouts && b->nb_channel_layouts) {
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MERGE_FORMATS(ret, a, b, channel_layouts, nb_channel_layouts,
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AVFilterChannelLayouts, fail);
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} else if (a->nb_channel_layouts) {
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MERGE_REF(a, b, channel_layouts, AVFilterChannelLayouts, fail);
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ret = a;
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} else {
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MERGE_REF(b, a, channel_layouts, AVFilterChannelLayouts, fail);
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ret = b;
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}
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return ret;
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fail:
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if (ret) {
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av_freep(&ret->refs);
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av_freep(&ret->channel_layouts);
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}
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av_freep(&ret);
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return NULL;
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}
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int ff_fmt_is_in(int fmt, const int *fmts)
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{
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const int *p;
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for (p = fmts; *p != AV_PIX_FMT_NONE; p++) {
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if (fmt == *p)
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return 1;
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}
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return 0;
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}
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AVFilterFormats *ff_make_format_list(const int *fmts)
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{
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AVFilterFormats *formats;
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int count;
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for (count = 0; fmts[count] != -1; count++)
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;
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formats = av_mallocz(sizeof(*formats));
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if (!formats)
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return NULL;
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if (count) {
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formats->formats = av_malloc(sizeof(*formats->formats) * count);
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if (!formats->formats) {
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av_freep(&formats);
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return NULL;
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}
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}
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formats->nb_formats = count;
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memcpy(formats->formats, fmts, sizeof(*formats->formats) * count);
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return formats;
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}
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#define ADD_FORMAT(f, fmt, type, list, nb) \
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do { \
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type *fmts; \
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\
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if (!(*f) && !(*f = av_mallocz(sizeof(**f)))) \
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return AVERROR(ENOMEM); \
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\
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fmts = av_realloc((*f)->list, \
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sizeof(*(*f)->list) * ((*f)->nb + 1));\
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if (!fmts) { \
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av_freep(&f); \
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return AVERROR(ENOMEM); \
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} \
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\
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(*f)->list = fmts; \
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(*f)->list[(*f)->nb++] = fmt; \
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return 0; \
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} while (0)
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int ff_add_format(AVFilterFormats **avff, int fmt)
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{
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ADD_FORMAT(avff, fmt, int, formats, nb_formats);
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}
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int ff_add_channel_layout(AVFilterChannelLayouts **l, uint64_t channel_layout)
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{
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ADD_FORMAT(l, channel_layout, uint64_t, channel_layouts, nb_channel_layouts);
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}
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AVFilterFormats *ff_all_formats(enum AVMediaType type)
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{
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AVFilterFormats *ret = NULL;
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if (type == AVMEDIA_TYPE_VIDEO) {
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const AVPixFmtDescriptor *desc = NULL;
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while ((desc = av_pix_fmt_desc_next(desc))) {
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ff_add_format(&ret, av_pix_fmt_desc_get_id(desc));
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}
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} else if (type == AVMEDIA_TYPE_AUDIO) {
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enum AVSampleFormat fmt = 0;
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while (av_get_sample_fmt_name(fmt)) {
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ff_add_format(&ret, fmt);
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fmt++;
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}
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}
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return ret;
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}
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AVFilterFormats *ff_planar_sample_fmts(void)
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{
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AVFilterFormats *ret = NULL;
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int fmt;
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for (fmt = 0; fmt < AV_SAMPLE_FMT_NB; fmt++)
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if (av_sample_fmt_is_planar(fmt))
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ff_add_format(&ret, fmt);
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return ret;
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}
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AVFilterFormats *ff_all_samplerates(void)
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{
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AVFilterFormats *ret = av_mallocz(sizeof(*ret));
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return ret;
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}
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AVFilterChannelLayouts *ff_all_channel_layouts(void)
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{
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AVFilterChannelLayouts *ret = av_mallocz(sizeof(*ret));
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return ret;
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}
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#define FORMATS_REF(f, ref) \
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do { \
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*ref = f; \
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f->refs = av_realloc(f->refs, sizeof(*f->refs) * ++f->refcount); \
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if (!f->refs) \
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return; \
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f->refs[f->refcount-1] = ref; \
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} while (0)
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void ff_channel_layouts_ref(AVFilterChannelLayouts *f, AVFilterChannelLayouts **ref)
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{
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FORMATS_REF(f, ref);
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}
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void ff_formats_ref(AVFilterFormats *f, AVFilterFormats **ref)
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{
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FORMATS_REF(f, ref);
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}
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#define FIND_REF_INDEX(ref, idx) \
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do { \
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int i; \
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for (i = 0; i < (*ref)->refcount; i ++) \
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if((*ref)->refs[i] == ref) { \
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idx = i; \
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break; \
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} \
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} while (0)
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#define FORMATS_UNREF(ref, list) \
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do { \
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int idx = -1; \
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\
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if (!*ref) \
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return; \
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\
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FIND_REF_INDEX(ref, idx); \
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\
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if (idx >= 0) \
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memmove((*ref)->refs + idx, (*ref)->refs + idx + 1, \
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sizeof(*(*ref)->refs) * ((*ref)->refcount - idx - 1)); \
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\
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if(!--(*ref)->refcount) { \
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av_free((*ref)->list); \
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av_free((*ref)->refs); \
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av_free(*ref); \
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} \
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*ref = NULL; \
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} while (0)
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void ff_formats_unref(AVFilterFormats **ref)
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{
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FORMATS_UNREF(ref, formats);
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}
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void ff_channel_layouts_unref(AVFilterChannelLayouts **ref)
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{
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FORMATS_UNREF(ref, channel_layouts);
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}
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#define FORMATS_CHANGEREF(oldref, newref) \
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do { \
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int idx = -1; \
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\
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FIND_REF_INDEX(oldref, idx); \
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\
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if (idx >= 0) { \
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(*oldref)->refs[idx] = newref; \
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*newref = *oldref; \
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*oldref = NULL; \
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} \
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} while (0)
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void ff_channel_layouts_changeref(AVFilterChannelLayouts **oldref,
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AVFilterChannelLayouts **newref)
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{
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FORMATS_CHANGEREF(oldref, newref);
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}
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void ff_formats_changeref(AVFilterFormats **oldref, AVFilterFormats **newref)
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{
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FORMATS_CHANGEREF(oldref, newref);
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}
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#define SET_COMMON_FORMATS(ctx, fmts, in_fmts, out_fmts, ref, list) \
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{ \
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int count = 0, i; \
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\
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for (i = 0; i < ctx->nb_inputs; i++) { \
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if (ctx->inputs[i]) { \
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ref(fmts, &ctx->inputs[i]->out_fmts); \
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count++; \
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} \
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} \
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for (i = 0; i < ctx->nb_outputs; i++) { \
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if (ctx->outputs[i]) { \
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ref(fmts, &ctx->outputs[i]->in_fmts); \
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count++; \
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} \
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} \
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\
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if (!count) { \
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av_freep(&fmts->list); \
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av_freep(&fmts->refs); \
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av_freep(&fmts); \
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} \
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}
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void ff_set_common_channel_layouts(AVFilterContext *ctx,
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AVFilterChannelLayouts *layouts)
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{
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SET_COMMON_FORMATS(ctx, layouts, in_channel_layouts, out_channel_layouts,
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ff_channel_layouts_ref, channel_layouts);
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}
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void ff_set_common_samplerates(AVFilterContext *ctx,
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AVFilterFormats *samplerates)
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{
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SET_COMMON_FORMATS(ctx, samplerates, in_samplerates, out_samplerates,
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ff_formats_ref, formats);
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}
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/**
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* A helper for query_formats() which sets all links to the same list of
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* formats. If there are no links hooked to this filter, the list of formats is
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* freed.
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*/
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void ff_set_common_formats(AVFilterContext *ctx, AVFilterFormats *formats)
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{
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SET_COMMON_FORMATS(ctx, formats, in_formats, out_formats,
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ff_formats_ref, formats);
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}
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int ff_default_query_formats(AVFilterContext *ctx)
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{
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enum AVMediaType type = ctx->inputs && ctx->inputs [0] ? ctx->inputs [0]->type :
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ctx->outputs && ctx->outputs[0] ? ctx->outputs[0]->type :
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AVMEDIA_TYPE_VIDEO;
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ff_set_common_formats(ctx, ff_all_formats(type));
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if (type == AVMEDIA_TYPE_AUDIO) {
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ff_set_common_channel_layouts(ctx, ff_all_channel_layouts());
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ff_set_common_samplerates(ctx, ff_all_samplerates());
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}
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return 0;
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}
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