libavutil/samplefmt.c

   1 /*
   2  * This file is part of Libav.
   3  *
   4  * Libav is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU Lesser General Public
   6  * License as published by the Free Software Foundation; either
   7  * version 2.1 of the License, or (at your option) any later version.
   8  *
   9  * Libav is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * Lesser General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Lesser General Public
  15  * License along with Libav; if not, write to the Free Software
  16  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  17  */
  18
  19 #include "samplefmt.h"
  20
  21 #include <stdio.h>
  22 #include <stdlib.h>
  23 #include <string.h>
  24
  25 typedef struct SampleFmtInfo {
  26     const char *name;
  27     int bits;
  28     int planar;
  29 } SampleFmtInfo;
  30
  31 /** this table gives more information about formats */
  32 static const SampleFmtInfo sample_fmt_info[AV_SAMPLE_FMT_NB] = {
  33     [AV_SAMPLE_FMT_U8]   = { .name =   "u8", .bits =  8, .planar = 0 },
  34     [AV_SAMPLE_FMT_S16]  = { .name =  "s16", .bits = 16, .planar = 0 },
  35     [AV_SAMPLE_FMT_S32]  = { .name =  "s32", .bits = 32, .planar = 0 },
  36     [AV_SAMPLE_FMT_FLT]  = { .name =  "flt", .bits = 32, .planar = 0 },
  37     [AV_SAMPLE_FMT_DBL]  = { .name =  "dbl", .bits = 64, .planar = 0 },
  38     [AV_SAMPLE_FMT_U8P]  = { .name =  "u8p", .bits =  8, .planar = 1 },
  39     [AV_SAMPLE_FMT_S16P] = { .name = "s16p", .bits = 16, .planar = 1 },
  40     [AV_SAMPLE_FMT_S32P] = { .name = "s32p", .bits = 32, .planar = 1 },
  41     [AV_SAMPLE_FMT_FLTP] = { .name = "fltp", .bits = 32, .planar = 1 },
  42     [AV_SAMPLE_FMT_DBLP] = { .name = "dblp", .bits = 64, .planar = 1 },
  43 };
  44
  45 const char *av_get_sample_fmt_name(enum AVSampleFormat sample_fmt)
  46 {
  47     if (sample_fmt < 0 || sample_fmt >= AV_SAMPLE_FMT_NB)
  48         return NULL;
  49     return sample_fmt_info[sample_fmt].name;
  50 }
  51
  52 enum AVSampleFormat av_get_sample_fmt(const char *name)
  53 {
  54     int i;
  55
  56     for (i = 0; i < AV_SAMPLE_FMT_NB; i++)
  57         if (!strcmp(sample_fmt_info[i].name, name))
  58             return i;
  59     return AV_SAMPLE_FMT_NONE;
  60 }
  61
  62 char *av_get_sample_fmt_string (char *buf, int buf_size, enum AVSampleFormat sample_fmt)
  63 {
  64     /* print header */
  65     if (sample_fmt < 0)
  66         snprintf(buf, buf_size, "name  " " depth");
  67     else if (sample_fmt < AV_SAMPLE_FMT_NB) {
  68         SampleFmtInfo info = sample_fmt_info[sample_fmt];
  69         snprintf (buf, buf_size, "%-6s" "   %2d ", info.name, info.bits);
  70     }
  71
  72     return buf;
  73 }
  74
  75 int av_get_bytes_per_sample(enum AVSampleFormat sample_fmt)
  76 {
  77      return sample_fmt < 0 || sample_fmt >= AV_SAMPLE_FMT_NB ?
  78         0 : sample_fmt_info[sample_fmt].bits >> 3;
  79 }
  80
  81 #if FF_API_GET_BITS_PER_SAMPLE_FMT
  82 int av_get_bits_per_sample_fmt(enum AVSampleFormat sample_fmt)
  83 {
  84     return sample_fmt < 0 || sample_fmt >= AV_SAMPLE_FMT_NB ?
  85         0 : sample_fmt_info[sample_fmt].bits;
  86 }
  87 #endif
  88
  89 int av_sample_fmt_is_planar(enum AVSampleFormat sample_fmt)
  90 {
  91      if (sample_fmt < 0 || sample_fmt >= AV_SAMPLE_FMT_NB)
  92          return 0;
  93      return sample_fmt_info[sample_fmt].planar;
  94 }
  95
  96 int av_samples_get_buffer_size(int *linesize, int nb_channels, int nb_samples,
  97                                enum AVSampleFormat sample_fmt, int align)
  98 {
  99     int line_size;
 100     int sample_size = av_get_bytes_per_sample(sample_fmt);
 101     int planar      = av_sample_fmt_is_planar(sample_fmt);
 102
 103     /* validate parameter ranges */
 104     if (!sample_size || nb_samples <= 0 || nb_channels <= 0)
 105         return AVERROR(EINVAL);
 106
 107     /* check for integer overflow */
 108     if (nb_channels > INT_MAX / align ||
 109         (int64_t)nb_channels * nb_samples > (INT_MAX - (align * nb_channels)) / sample_size)
 110         return AVERROR(EINVAL);
 111
 112     line_size = planar ? FFALIGN(nb_samples * sample_size,               align) :
 113                          FFALIGN(nb_samples * sample_size * nb_channels, align);
 114     if (linesize)
 115         *linesize = line_size;
 116
 117     return planar ? line_size * nb_channels : line_size;
 118 }
 119
 120 int av_samples_fill_arrays(uint8_t **audio_data, int *linesize,
 121                            uint8_t *buf, int nb_channels, int nb_samples,
 122                            enum AVSampleFormat sample_fmt, int align)
 123 {
 124     int ch, planar, buf_size;
 125
 126     planar   = av_sample_fmt_is_planar(sample_fmt);
 127     buf_size = av_samples_get_buffer_size(linesize, nb_channels, nb_samples,
 128                                           sample_fmt, align);
 129     if (buf_size < 0)
 130         return buf_size;
 131
 132     audio_data[0] = buf;
 133     for (ch = 1; planar && ch < nb_channels; ch++)
 134         audio_data[ch] = audio_data[ch-1] + *linesize;
 135
 136     return 0;
 137 }
 138
 139 int av_samples_alloc(uint8_t **audio_data, int *linesize, int nb_channels,
 140                      int nb_samples, enum AVSampleFormat sample_fmt, int align)
 141 {
 142     uint8_t *buf;
 143     int size = av_samples_get_buffer_size(NULL, nb_channels, nb_samples,
 144                                           sample_fmt, align);
 145     if (size < 0)
 146         return size;
 147
 148     buf = av_mallocz(size);
 149     if (!buf)
 150         return AVERROR(ENOMEM);
 151
 152     size = av_samples_fill_arrays(audio_data, linesize, buf, nb_channels,
 153                                   nb_samples, sample_fmt, align);
 154     if (size < 0) {
 155         av_free(buf);
 156         return size;
 157     }
 158     return 0;
 159 }