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ffmpeg / libavutil / samplefmt.c @ 08675bb3

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