/*
  * 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_bytes_per_sample(enum AVSampleFormat sample_fmt)
 {
      return sample_fmt < 0 || sample_fmt >= AV_SAMPLE_FMT_NB ?
         0 : sample_fmt_info[sample_fmt].bits >> 3;
 }
 
 #if FF_API_GET_BITS_PER_SAMPLE_FMT

 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;
 }

 #endif

 
 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, linesize;

     int sample_size = av_get_bits_per_sample_fmt(sample_fmt) >> 3;
 

     if (nb_channels * (uint64_t)nb_samples * sample_size >= INT_MAX - align*(uint64_t)nb_channels)

         return AVERROR(EINVAL);

     linesize = planar ? FFALIGN(nb_samples*sample_size,             align) :
                         FFALIGN(nb_samples*sample_size*nb_channels, align);

 
     if (pointers) {
         pointers[0] = buf;

         for (i = 1; planar && i < nb_channels; i++) {
             pointers[i] = pointers[i-1] + linesize;

         }

         memset(&pointers[i], 0, (8-i) * sizeof(pointers[0]));

     }
 
     if (linesizes) {

         linesizes[0] = linesize;
         for (i = 1; planar && i < nb_channels; i++)
             linesizes[i] = linesizes[0];
         memset(&linesizes[i], 0, (8-i) * sizeof(linesizes[0]));

     }
 

     return planar ? linesize * nb_channels : linesize;

 }
 
 int av_samples_alloc(uint8_t *pointers[8], int linesizes[8],

                      int nb_channels, int nb_samples,

                      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);
 }