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/*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "samplefmt.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
typedef struct SampleFmtInfo {
const char *name;
int bits;
} SampleFmtInfo;
/** this table gives more information about formats */
static const SampleFmtInfo sample_fmt_info[AV_SAMPLE_FMT_NB] = {
[AV_SAMPLE_FMT_U8] = { .name = "u8", .bits = 8 },
[AV_SAMPLE_FMT_S16] = { .name = "s16", .bits = 16 },
[AV_SAMPLE_FMT_S32] = { .name = "s32", .bits = 32 },
[AV_SAMPLE_FMT_FLT] = { .name = "flt", .bits = 32 },
[AV_SAMPLE_FMT_DBL] = { .name = "dbl", .bits = 64 },
};
const char *av_get_sample_fmt_name(enum AVSampleFormat sample_fmt)
{
if (sample_fmt < 0 || sample_fmt >= AV_SAMPLE_FMT_NB)
return NULL;
return sample_fmt_info[sample_fmt].name;
}
enum AVSampleFormat av_get_sample_fmt(const char *name)
{
int i;
for (i = 0; i < AV_SAMPLE_FMT_NB; i++)
if (!strcmp(sample_fmt_info[i].name, name))
return i;
return AV_SAMPLE_FMT_NONE;
}
char *av_get_sample_fmt_string (char *buf, int buf_size, enum AVSampleFormat sample_fmt)
{
/* print header */
if (sample_fmt < 0)
snprintf(buf, buf_size, "name " " depth");
else if (sample_fmt < AV_SAMPLE_FMT_NB) {
SampleFmtInfo info = sample_fmt_info[sample_fmt];
snprintf (buf, buf_size, "%-6s" " %2d ", info.name, info.bits);
}
return buf;
}
int av_get_bits_per_sample_fmt(enum AVSampleFormat sample_fmt)
{
return sample_fmt < 0 || sample_fmt >= AV_SAMPLE_FMT_NB ?
0 : sample_fmt_info[sample_fmt].bits;
}
int av_samples_fill_arrays(uint8_t *pointers[8], int linesizes[8],
uint8_t *buf, int nb_channels, int nb_samples,
enum AVSampleFormat sample_fmt, int planar, int align)
{
int i, step_size = 0;
int sample_size = av_get_bits_per_sample_fmt(sample_fmt) >> 3;
int channel_step = planar ? FFALIGN(nb_samples*sample_size, align) : sample_size;
if(nb_channels * (uint64_t)nb_samples * sample_size >= INT_MAX - align*(uint64_t)nb_channels)
return AVERROR(EINVAL);
if (pointers) {
pointers[0] = buf;
for (i = 0; i < nb_channels; i++) {
pointers[i] = buf + step_size;
step_size += channel_step;
}
memset(&pointers[nb_channels], 0, (8-nb_channels) * sizeof(pointers[0]));
}
if (linesizes) {
linesizes[0] = planar ? sample_size : nb_channels*sample_size;
memset(&linesizes[1], 0, (8-1) * sizeof(linesizes[0]));
}
return planar ? channel_step * nb_channels : FFALIGN(nb_channels*sample_size*nb_samples, align);
}
int av_samples_alloc(uint8_t *pointers[8], int linesizes[8],
int nb_samples, int nb_channels,
enum AVSampleFormat sample_fmt, int planar,
int align)
{
uint8_t *buf;
int size = av_samples_fill_arrays(NULL, NULL,
NULL, nb_channels, nb_samples,
sample_fmt, planar, align);
buf = av_mallocz(size);
if (!buf)
return AVERROR(ENOMEM);
return av_samples_fill_arrays(pointers, linesizes,
buf, nb_channels, nb_samples,
sample_fmt, planar, align);
}
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