git.sesse.net Git - ffmpeg/blob - libavfilter/formats.c

   1 /*
   2  * Filter layer - format negotiation
   3  * Copyright (c) 2007 Bobby Bingham
   4  *
   5  * This file is part of FFmpeg.
   6  *
   7  * FFmpeg is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2.1 of the License, or (at your option) any later version.
  11  *
  12  * FFmpeg is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with FFmpeg; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20  */
  21
  22 #include "libavutil/pixdesc.h"
  23 #include "libavutil/audioconvert.h"
  24 #include "avfilter.h"
  25
  26 /**
  27  * Add all refs from a to ret and destroy a.
  28  */
  29 static void merge_ref(AVFilterFormats *ret, AVFilterFormats *a)
  30 {
  31     int i;
  32
  33     for (i = 0; i < a->refcount; i++) {
  34         ret->refs[ret->refcount] = a->refs[i];
  35         *ret->refs[ret->refcount++] = ret;
  36     }
  37
  38     av_free(a->refs);
  39     av_free(a->formats);
  40     av_free(a);
  41 }
  42
  43 AVFilterFormats *avfilter_merge_formats(AVFilterFormats *a, AVFilterFormats *b)
  44 {
  45     AVFilterFormats *ret;
  46     unsigned i, j, k = 0;
  47
  48     if (a == b) return a;
  49
  50     ret = av_mallocz(sizeof(AVFilterFormats));
  51
  52     /* merge list of formats */
  53     ret->formats = av_malloc(sizeof(*ret->formats) * FFMIN(a->format_count,
  54                                                            b->format_count));
  55     for (i = 0; i < a->format_count; i++)
  56         for (j = 0; j < b->format_count; j++)
  57             if (a->formats[i] == b->formats[j])
  58                 ret->formats[k++] = a->formats[i];
  59
  60     ret->format_count = k;
  61     /* check that there was at least one common format */
  62     if (!ret->format_count) {
  63         av_free(ret->formats);
  64         av_free(ret);
  65         return NULL;
  66     }
  67
  68     ret->refs = av_malloc(sizeof(AVFilterFormats**)*(a->refcount+b->refcount));
  69
  70     merge_ref(ret, a);
  71     merge_ref(ret, b);
  72
  73     return ret;
  74 }
  75
  76 #define MAKE_FORMAT_LIST()                                              \
  77     AVFilterFormats *formats;                                           \
  78     int count = 0;                                                      \
  79     if (fmts)                                                           \
  80         for (count = 0; fmts[count] != -1; count++)                     \
  81             ;                                                           \
  82     formats = av_mallocz(sizeof(AVFilterFormats));                      \
  83     if (!formats) return NULL;                                          \
  84     formats->format_count = count;                                      \
  85     if (count) {                                                        \
  86         formats->formats = av_malloc(sizeof(*formats->formats)*count);  \
  87         if (!formats->formats) {                                        \
  88             av_free(formats);                                           \
  89             return NULL;                                                \
  90         }                                                               \
  91     }
  92
  93 AVFilterFormats *avfilter_make_format_list(const int *fmts)
  94 {
  95     MAKE_FORMAT_LIST();
  96     while (count--)
  97         formats->formats[count] = fmts[count];
  98
  99     return formats;
 100 }
 101
 102 AVFilterFormats *avfilter_make_format64_list(const int64_t *fmts)
 103 {
 104     MAKE_FORMAT_LIST();
 105     if (count)
 106         memcpy(formats->formats, fmts, sizeof(*formats->formats) * count);
 107
 108     return formats;
 109 }
 110
 111 int avfilter_add_format(AVFilterFormats **avff, int64_t fmt)
 112 {
 113     int64_t *fmts;
 114
 115     if (!(*avff) && !(*avff = av_mallocz(sizeof(AVFilterFormats))))
 116         return AVERROR(ENOMEM);
 117
 118     fmts = av_realloc((*avff)->formats,
 119                       sizeof(*(*avff)->formats) * ((*avff)->format_count+1));
 120     if (!fmts)
 121         return AVERROR(ENOMEM);
 122
 123     (*avff)->formats = fmts;
 124     (*avff)->formats[(*avff)->format_count++] = fmt;
 125     return 0;
 126 }
 127
 128 AVFilterFormats *avfilter_all_formats(enum AVMediaType type)
 129 {
 130     AVFilterFormats *ret = NULL;
 131     int fmt;
 132     int num_formats = type == AVMEDIA_TYPE_VIDEO ? PIX_FMT_NB    :
 133                       type == AVMEDIA_TYPE_AUDIO ? AV_SAMPLE_FMT_NB : 0;
 134
 135     for (fmt = 0; fmt < num_formats; fmt++)
 136         if ((type != AVMEDIA_TYPE_VIDEO) ||
 137             (type == AVMEDIA_TYPE_VIDEO && !(av_pix_fmt_descriptors[fmt].flags & PIX_FMT_HWACCEL)))
 138             avfilter_add_format(&ret, fmt);
 139
 140     return ret;
 141 }
 142
 143 AVFilterFormats *avfilter_all_channel_layouts(void)
 144 {
 145     static int64_t chlayouts[] = {
 146         AV_CH_LAYOUT_MONO,
 147         AV_CH_LAYOUT_STEREO,
 148         AV_CH_LAYOUT_4POINT0,
 149         AV_CH_LAYOUT_QUAD,
 150         AV_CH_LAYOUT_5POINT0,
 151         AV_CH_LAYOUT_5POINT0_BACK,
 152         AV_CH_LAYOUT_5POINT1,
 153         AV_CH_LAYOUT_5POINT1_BACK,
 154         AV_CH_LAYOUT_5POINT1|AV_CH_LAYOUT_STEREO_DOWNMIX,
 155         AV_CH_LAYOUT_7POINT1,
 156         AV_CH_LAYOUT_7POINT1_WIDE,
 157         AV_CH_LAYOUT_7POINT1|AV_CH_LAYOUT_STEREO_DOWNMIX,
 158         -1,
 159     };
 160
 161     return avfilter_make_format64_list(chlayouts);
 162 }
 163
 164 void avfilter_formats_ref(AVFilterFormats *f, AVFilterFormats **ref)
 165 {
 166     *ref = f;
 167     f->refs = av_realloc(f->refs, sizeof(AVFilterFormats**) * ++f->refcount);
 168     f->refs[f->refcount-1] = ref;
 169 }
 170
 171 static int find_ref_index(AVFilterFormats **ref)
 172 {
 173     int i;
 174     for (i = 0; i < (*ref)->refcount; i++)
 175         if ((*ref)->refs[i] == ref)
 176             return i;
 177     return -1;
 178 }
 179
 180 void avfilter_formats_unref(AVFilterFormats **ref)
 181 {
 182     int idx;
 183
 184     if (!*ref)
 185         return;
 186
 187     idx = find_ref_index(ref);
 188
 189     if (idx >= 0)
 190         memmove((*ref)->refs + idx, (*ref)->refs + idx+1,
 191             sizeof(AVFilterFormats**) * ((*ref)->refcount-idx-1));
 192
 193     if (!--(*ref)->refcount) {
 194         av_free((*ref)->formats);
 195         av_free((*ref)->refs);
 196         av_free(*ref);
 197     }
 198     *ref = NULL;
 199 }
 200
 201 void avfilter_formats_changeref(AVFilterFormats **oldref,
 202                                 AVFilterFormats **newref)
 203 {
 204     int idx = find_ref_index(oldref);
 205
 206     if (idx >= 0) {
 207         (*oldref)->refs[idx] = newref;
 208         *newref = *oldref;
 209         *oldref = NULL;
 210     }
 211 }
 212