2 * This file is part of FFmpeg.
4 * FFmpeg 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.
9 * FFmpeg 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.
14 * You should have received a copy of the GNU Lesser General Public
15 * License along with FFmpeg; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19 #include "samplefmt.h"
25 typedef struct SampleFmtInfo {
30 /** this table gives more information about formats */
31 static const SampleFmtInfo sample_fmt_info[AV_SAMPLE_FMT_NB] = {
32 [AV_SAMPLE_FMT_U8] = { .name = "u8", .bits = 8 },
33 [AV_SAMPLE_FMT_S16] = { .name = "s16", .bits = 16 },
34 [AV_SAMPLE_FMT_S32] = { .name = "s32", .bits = 32 },
35 [AV_SAMPLE_FMT_FLT] = { .name = "flt", .bits = 32 },
36 [AV_SAMPLE_FMT_DBL] = { .name = "dbl", .bits = 64 },
39 const char *av_get_sample_fmt_name(enum AVSampleFormat sample_fmt)
41 if (sample_fmt < 0 || sample_fmt >= AV_SAMPLE_FMT_NB)
43 return sample_fmt_info[sample_fmt].name;
46 enum AVSampleFormat av_get_sample_fmt(const char *name)
50 for (i = 0; i < AV_SAMPLE_FMT_NB; i++)
51 if (!strcmp(sample_fmt_info[i].name, name))
53 return AV_SAMPLE_FMT_NONE;
56 char *av_get_sample_fmt_string (char *buf, int buf_size, enum AVSampleFormat sample_fmt)
60 snprintf(buf, buf_size, "name " " depth");
61 else if (sample_fmt < AV_SAMPLE_FMT_NB) {
62 SampleFmtInfo info = sample_fmt_info[sample_fmt];
63 snprintf (buf, buf_size, "%-6s" " %2d ", info.name, info.bits);
69 int av_get_bytes_per_sample(enum AVSampleFormat sample_fmt)
71 return sample_fmt < 0 || sample_fmt >= AV_SAMPLE_FMT_NB ?
72 0 : sample_fmt_info[sample_fmt].bits >> 3;
75 #if FF_API_GET_BITS_PER_SAMPLE_FMT
76 int av_get_bits_per_sample_fmt(enum AVSampleFormat sample_fmt)
78 return sample_fmt < 0 || sample_fmt >= AV_SAMPLE_FMT_NB ?
79 0 : sample_fmt_info[sample_fmt].bits;
83 int av_samples_fill_arrays(uint8_t *pointers[8], int linesizes[8],
84 uint8_t *buf, int nb_channels, int nb_samples,
85 enum AVSampleFormat sample_fmt, int planar, int align)
88 int sample_size = av_get_bytes_per_sample(sample_fmt);
90 if (nb_channels * (uint64_t)nb_samples * sample_size >= INT_MAX - align*(uint64_t)nb_channels)
91 return AVERROR(EINVAL);
92 linesize = planar ? FFALIGN(nb_samples*sample_size, align) :
93 FFALIGN(nb_samples*sample_size*nb_channels, align);
97 for (i = 1; planar && i < nb_channels; i++) {
98 pointers[i] = pointers[i-1] + linesize;
100 memset(&pointers[i], 0, (8-i) * sizeof(pointers[0]));
104 linesizes[0] = linesize;
105 for (i = 1; planar && i < nb_channels; i++)
106 linesizes[i] = linesizes[0];
107 memset(&linesizes[i], 0, (8-i) * sizeof(linesizes[0]));
110 return planar ? linesize * nb_channels : linesize;
113 int av_samples_alloc(uint8_t *pointers[8], int linesizes[8],
114 int nb_channels, int nb_samples,
115 enum AVSampleFormat sample_fmt, int planar,
119 int size = av_samples_fill_arrays(NULL, NULL,
120 NULL, nb_channels, nb_samples,
121 sample_fmt, planar, align);
123 buf = av_mallocz(size);
125 return AVERROR(ENOMEM);
127 return av_samples_fill_arrays(pointers, linesizes,
128 buf, nb_channels, nb_samples,
129 sample_fmt, planar, align);