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libavfilter/formats.c

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00001 /*
00002  * Filter layer - format negotiation
00003  * Copyright (c) 2007 Bobby Bingham
00004  *
00005  * This file is part of FFmpeg.
00006  *
00007  * FFmpeg is free software; you can redistribute it and/or
00008  * modify it under the terms of the GNU Lesser General Public
00009  * License as published by the Free Software Foundation; either
00010  * version 2.1 of the License, or (at your option) any later version.
00011  *
00012  * FFmpeg is distributed in the hope that it will be useful,
00013  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00014  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00015  * Lesser General Public License for more details.
00016  *
00017  * You should have received a copy of the GNU Lesser General Public
00018  * License along with FFmpeg; if not, write to the Free Software
00019  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
00020  */
00021 
00022 #include "libavutil/pixdesc.h"
00023 #include "libavutil/audioconvert.h"
00024 #include "avfilter.h"
00025 
00029 static void merge_ref(AVFilterFormats *ret, AVFilterFormats *a)
00030 {
00031     int i;
00032 
00033     for(i = 0; i < a->refcount; i ++) {
00034         ret->refs[ret->refcount] = a->refs[i];
00035         *ret->refs[ret->refcount++] = ret;
00036     }
00037 
00038     av_free(a->refs);
00039     av_free(a->formats);
00040     av_free(a);
00041 }
00042 
00043 AVFilterFormats *avfilter_merge_formats(AVFilterFormats *a, AVFilterFormats *b)
00044 {
00045     AVFilterFormats *ret;
00046     unsigned i, j, k = 0;
00047 
00048     if (a == b) return a;
00049 
00050     ret = av_mallocz(sizeof(AVFilterFormats));
00051 
00052     /* merge list of formats */
00053     ret->formats = av_malloc(sizeof(*ret->formats) * FFMIN(a->format_count,
00054                                                            b->format_count));
00055     for(i = 0; i < a->format_count; i ++)
00056         for(j = 0; j < b->format_count; j ++)
00057             if(a->formats[i] == b->formats[j])
00058                 ret->formats[k++] = a->formats[i];
00059 
00060     ret->format_count = k;
00061     /* check that there was at least one common format */
00062     if(!ret->format_count) {
00063         av_free(ret->formats);
00064         av_free(ret);
00065         return NULL;
00066     }
00067 
00068     ret->refs = av_malloc(sizeof(AVFilterFormats**)*(a->refcount+b->refcount));
00069 
00070     merge_ref(ret, a);
00071     merge_ref(ret, b);
00072 
00073     return ret;
00074 }
00075 
00076 #define MAKE_FORMAT_LIST()                                              \
00077     AVFilterFormats *formats;                                           \
00078     int count = 0;                                                      \
00079     if (fmts)                                                           \
00080         for (count = 0; fmts[count] != -1; count++)                     \
00081             ;                                                           \
00082     formats = av_mallocz(sizeof(AVFilterFormats));                      \
00083     if (!formats) return NULL;                                          \
00084     formats->format_count = count;                                      \
00085     if (count) {                                                        \
00086         formats->formats  = av_malloc(sizeof(*formats->formats)*count); \
00087         if (!formats->formats) {                                        \
00088             av_free(formats);                                           \
00089             return NULL;                                                \
00090         }                                                               \
00091     }
00092 
00093 AVFilterFormats *avfilter_make_format_list(const int *fmts)
00094 {
00095     MAKE_FORMAT_LIST();
00096     while (count--)
00097         formats->formats[count] = fmts[count];
00098 
00099     return formats;
00100 }
00101 
00102 AVFilterFormats *avfilter_make_format64_list(const int64_t *fmts)
00103 {
00104     MAKE_FORMAT_LIST();
00105     if (count)
00106         memcpy(formats->formats, fmts, sizeof(*formats->formats) * count);
00107 
00108     return formats;
00109 }
00110 
00111 int avfilter_add_format(AVFilterFormats **avff, int64_t fmt)
00112 {
00113     int64_t *fmts;
00114 
00115     if (!(*avff) && !(*avff = av_mallocz(sizeof(AVFilterFormats))))
00116         return AVERROR(ENOMEM);
00117 
00118     fmts = av_realloc((*avff)->formats,
00119                       sizeof(*(*avff)->formats) * ((*avff)->format_count+1));
00120     if (!fmts)
00121         return AVERROR(ENOMEM);
00122 
00123     (*avff)->formats = fmts;
00124     (*avff)->formats[(*avff)->format_count++] = fmt;
00125     return 0;
00126 }
00127 
00128 AVFilterFormats *avfilter_all_formats(enum AVMediaType type)
00129 {
00130     AVFilterFormats *ret = NULL;
00131     int fmt;
00132     int num_formats = type == AVMEDIA_TYPE_VIDEO ? PIX_FMT_NB    :
00133                       type == AVMEDIA_TYPE_AUDIO ? AV_SAMPLE_FMT_NB : 0;
00134 
00135     for (fmt = 0; fmt < num_formats; fmt++)
00136         if ((type != AVMEDIA_TYPE_VIDEO) ||
00137             (type == AVMEDIA_TYPE_VIDEO && !(av_pix_fmt_descriptors[fmt].flags & PIX_FMT_HWACCEL)))
00138             avfilter_add_format(&ret, fmt);
00139 
00140     return ret;
00141 }
00142 
00143 AVFilterFormats *avfilter_all_channel_layouts(void)
00144 {
00145     static int64_t chlayouts[] = {
00146         AV_CH_LAYOUT_MONO,
00147         AV_CH_LAYOUT_STEREO,
00148         AV_CH_LAYOUT_4POINT0,
00149         AV_CH_LAYOUT_QUAD,
00150         AV_CH_LAYOUT_5POINT0,
00151         AV_CH_LAYOUT_5POINT0_BACK,
00152         AV_CH_LAYOUT_5POINT1,
00153         AV_CH_LAYOUT_5POINT1_BACK,
00154         AV_CH_LAYOUT_5POINT1|AV_CH_LAYOUT_STEREO_DOWNMIX,
00155         AV_CH_LAYOUT_7POINT1,
00156         AV_CH_LAYOUT_7POINT1_WIDE,
00157         AV_CH_LAYOUT_7POINT1|AV_CH_LAYOUT_STEREO_DOWNMIX,
00158         -1,
00159     };
00160 
00161     return avfilter_make_format64_list(chlayouts);
00162 }
00163 
00164 void avfilter_formats_ref(AVFilterFormats *f, AVFilterFormats **ref)
00165 {
00166     *ref = f;
00167     f->refs = av_realloc(f->refs, sizeof(AVFilterFormats**) * ++f->refcount);
00168     f->refs[f->refcount-1] = ref;
00169 }
00170 
00171 static int find_ref_index(AVFilterFormats **ref)
00172 {
00173     int i;
00174     for(i = 0; i < (*ref)->refcount; i ++)
00175         if((*ref)->refs[i] == ref)
00176             return i;
00177     return -1;
00178 }
00179 
00180 void avfilter_formats_unref(AVFilterFormats **ref)
00181 {
00182     int idx;
00183 
00184     if (!*ref)
00185         return;
00186 
00187     idx = find_ref_index(ref);
00188 
00189     if(idx >= 0)
00190         memmove((*ref)->refs + idx, (*ref)->refs + idx+1,
00191             sizeof(AVFilterFormats**) * ((*ref)->refcount-idx-1));
00192 
00193     if(!--(*ref)->refcount) {
00194         av_free((*ref)->formats);
00195         av_free((*ref)->refs);
00196         av_free(*ref);
00197     }
00198     *ref = NULL;
00199 }
00200 
00201 void avfilter_formats_changeref(AVFilterFormats **oldref,
00202                                 AVFilterFormats **newref)
00203 {
00204     int idx = find_ref_index(oldref);
00205 
00206     if(idx >= 0) {
00207         (*oldref)->refs[idx] = newref;
00208         *newref = *oldref;
00209         *oldref = NULL;
00210     }
00211 }
00212 

Generated on Wed Apr 11 2012 07:31:35 for FFmpeg by  doxygen 1.7.1