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  1. /*
  2.  * This file is part of FFmpeg.
  3.  *
  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.
  8.  *
  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.
  13.  *
  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
  17.  */
  18.  
  19. #include "common.h"
  20. #include "samplefmt.h"
  21.  
  22. #include <stdio.h>
  23. #include <stdlib.h>
  24. #include <string.h>
  25.  
  26. typedef struct SampleFmtInfo {
  27.     char name[8];
  28.     int bits;
  29.     int planar;
  30.     enum AVSampleFormat altform; ///< planar<->packed alternative form
  31. } SampleFmtInfo;
  32.  
  33. /** this table gives more information about formats */
  34. static const SampleFmtInfo sample_fmt_info[AV_SAMPLE_FMT_NB] = {
  35.     [AV_SAMPLE_FMT_U8]   = { .name =   "u8", .bits =  8, .planar = 0, .altform = AV_SAMPLE_FMT_U8P  },
  36.     [AV_SAMPLE_FMT_S16]  = { .name =  "s16", .bits = 16, .planar = 0, .altform = AV_SAMPLE_FMT_S16P },
  37.     [AV_SAMPLE_FMT_S32]  = { .name =  "s32", .bits = 32, .planar = 0, .altform = AV_SAMPLE_FMT_S32P },
  38.     [AV_SAMPLE_FMT_FLT]  = { .name =  "flt", .bits = 32, .planar = 0, .altform = AV_SAMPLE_FMT_FLTP },
  39.     [AV_SAMPLE_FMT_DBL]  = { .name =  "dbl", .bits = 64, .planar = 0, .altform = AV_SAMPLE_FMT_DBLP },
  40.     [AV_SAMPLE_FMT_U8P]  = { .name =  "u8p", .bits =  8, .planar = 1, .altform = AV_SAMPLE_FMT_U8   },
  41.     [AV_SAMPLE_FMT_S16P] = { .name = "s16p", .bits = 16, .planar = 1, .altform = AV_SAMPLE_FMT_S16  },
  42.     [AV_SAMPLE_FMT_S32P] = { .name = "s32p", .bits = 32, .planar = 1, .altform = AV_SAMPLE_FMT_S32  },
  43.     [AV_SAMPLE_FMT_FLTP] = { .name = "fltp", .bits = 32, .planar = 1, .altform = AV_SAMPLE_FMT_FLT  },
  44.     [AV_SAMPLE_FMT_DBLP] = { .name = "dblp", .bits = 64, .planar = 1, .altform = AV_SAMPLE_FMT_DBL  },
  45. };
  46.  
  47. const char *av_get_sample_fmt_name(enum AVSampleFormat sample_fmt)
  48. {
  49.     if (sample_fmt < 0 || sample_fmt >= AV_SAMPLE_FMT_NB)
  50.         return NULL;
  51.     return sample_fmt_info[sample_fmt].name;
  52. }
  53.  
  54. enum AVSampleFormat av_get_sample_fmt(const char *name)
  55. {
  56.     int i;
  57.  
  58.     for (i = 0; i < AV_SAMPLE_FMT_NB; i++)
  59.         if (!strcmp(sample_fmt_info[i].name, name))
  60.             return i;
  61.     return AV_SAMPLE_FMT_NONE;
  62. }
  63.  
  64. enum AVSampleFormat av_get_alt_sample_fmt(enum AVSampleFormat sample_fmt, int planar)
  65. {
  66.     if (sample_fmt < 0 || sample_fmt >= AV_SAMPLE_FMT_NB)
  67.         return AV_SAMPLE_FMT_NONE;
  68.     if (sample_fmt_info[sample_fmt].planar == planar)
  69.         return sample_fmt;
  70.     return sample_fmt_info[sample_fmt].altform;
  71. }
  72.  
  73. enum AVSampleFormat av_get_packed_sample_fmt(enum AVSampleFormat sample_fmt)
  74. {
  75.     if (sample_fmt < 0 || sample_fmt >= AV_SAMPLE_FMT_NB)
  76.         return AV_SAMPLE_FMT_NONE;
  77.     if (sample_fmt_info[sample_fmt].planar)
  78.         return sample_fmt_info[sample_fmt].altform;
  79.     return sample_fmt;
  80. }
  81.  
  82. enum AVSampleFormat av_get_planar_sample_fmt(enum AVSampleFormat sample_fmt)
  83. {
  84.     if (sample_fmt < 0 || sample_fmt >= AV_SAMPLE_FMT_NB)
  85.         return AV_SAMPLE_FMT_NONE;
  86.     if (sample_fmt_info[sample_fmt].planar)
  87.         return sample_fmt;
  88.     return sample_fmt_info[sample_fmt].altform;
  89. }
  90.  
  91. char *av_get_sample_fmt_string (char *buf, int buf_size, enum AVSampleFormat sample_fmt)
  92. {
  93.     /* print header */
  94.     if (sample_fmt < 0)
  95.         snprintf(buf, buf_size, "name  " " depth");
  96.     else if (sample_fmt < AV_SAMPLE_FMT_NB) {
  97.         SampleFmtInfo info = sample_fmt_info[sample_fmt];
  98.         snprintf (buf, buf_size, "%-6s" "   %2d ", info.name, info.bits);
  99.     }
  100.  
  101.     return buf;
  102. }
  103.  
  104. int av_get_bytes_per_sample(enum AVSampleFormat sample_fmt)
  105. {
  106.      return sample_fmt < 0 || sample_fmt >= AV_SAMPLE_FMT_NB ?
  107.         0 : sample_fmt_info[sample_fmt].bits >> 3;
  108. }
  109.  
  110. #if FF_API_GET_BITS_PER_SAMPLE_FMT
  111. int av_get_bits_per_sample_fmt(enum AVSampleFormat sample_fmt)
  112. {
  113.     return sample_fmt < 0 || sample_fmt >= AV_SAMPLE_FMT_NB ?
  114.         0 : sample_fmt_info[sample_fmt].bits;
  115. }
  116. #endif
  117.  
  118. int av_sample_fmt_is_planar(enum AVSampleFormat sample_fmt)
  119. {
  120.      if (sample_fmt < 0 || sample_fmt >= AV_SAMPLE_FMT_NB)
  121.          return 0;
  122.      return sample_fmt_info[sample_fmt].planar;
  123. }
  124.  
  125. int av_samples_get_buffer_size(int *linesize, int nb_channels, int nb_samples,
  126.                                enum AVSampleFormat sample_fmt, int align)
  127. {
  128.     int line_size;
  129.     int sample_size = av_get_bytes_per_sample(sample_fmt);
  130.     int planar      = av_sample_fmt_is_planar(sample_fmt);
  131.  
  132.     /* validate parameter ranges */
  133.     if (!sample_size || nb_samples <= 0 || nb_channels <= 0)
  134.         return AVERROR(EINVAL);
  135.  
  136.     /* auto-select alignment if not specified */
  137.     if (!align) {
  138.         align = 1;
  139.         nb_samples = FFALIGN(nb_samples, 32);
  140.     }
  141.  
  142.     /* check for integer overflow */
  143.     if (nb_channels > INT_MAX / align ||
  144.         (int64_t)nb_channels * nb_samples > (INT_MAX - (align * nb_channels)) / sample_size)
  145.         return AVERROR(EINVAL);
  146.  
  147.     line_size = planar ? FFALIGN(nb_samples * sample_size,               align) :
  148.                          FFALIGN(nb_samples * sample_size * nb_channels, align);
  149.     if (linesize)
  150.         *linesize = line_size;
  151.  
  152.     return planar ? line_size * nb_channels : line_size;
  153. }
  154.  
  155. int av_samples_fill_arrays(uint8_t **audio_data, int *linesize,
  156.                            const uint8_t *buf, int nb_channels, int nb_samples,
  157.                            enum AVSampleFormat sample_fmt, int align)
  158. {
  159.     int ch, planar, buf_size, line_size;
  160.  
  161.     planar   = av_sample_fmt_is_planar(sample_fmt);
  162.     buf_size = av_samples_get_buffer_size(&line_size, nb_channels, nb_samples,
  163.                                           sample_fmt, align);
  164.     if (buf_size < 0)
  165.         return buf_size;
  166.  
  167.     audio_data[0] = (uint8_t *)buf;
  168.     for (ch = 1; planar && ch < nb_channels; ch++)
  169.         audio_data[ch] = audio_data[ch-1] + line_size;
  170.  
  171.     if (linesize)
  172.         *linesize = line_size;
  173.  
  174. #if FF_API_SAMPLES_UTILS_RETURN_ZERO
  175.     return 0;
  176. #else
  177.     return buf_size;
  178. #endif
  179. }
  180.  
  181. int av_samples_alloc(uint8_t **audio_data, int *linesize, int nb_channels,
  182.                      int nb_samples, enum AVSampleFormat sample_fmt, int align)
  183. {
  184.     uint8_t *buf;
  185.     int size = av_samples_get_buffer_size(NULL, nb_channels, nb_samples,
  186.                                           sample_fmt, align);
  187.     if (size < 0)
  188.         return size;
  189.  
  190.     buf = av_malloc(size);
  191.     if (!buf)
  192.         return AVERROR(ENOMEM);
  193.  
  194.     size = av_samples_fill_arrays(audio_data, linesize, buf, nb_channels,
  195.                                   nb_samples, sample_fmt, align);
  196.     if (size < 0) {
  197.         av_free(buf);
  198.         return size;
  199.     }
  200.  
  201.     av_samples_set_silence(audio_data, 0, nb_samples, nb_channels, sample_fmt);
  202.  
  203. #if FF_API_SAMPLES_UTILS_RETURN_ZERO
  204.     return 0;
  205. #else
  206.     return size;
  207. #endif
  208. }
  209.  
  210. int av_samples_alloc_array_and_samples(uint8_t ***audio_data, int *linesize, int nb_channels,
  211.                                        int nb_samples, enum AVSampleFormat sample_fmt, int align)
  212. {
  213.     int ret, nb_planes = av_sample_fmt_is_planar(sample_fmt) ? nb_channels : 1;
  214.  
  215.     *audio_data = av_calloc(nb_planes, sizeof(**audio_data));
  216.     if (!*audio_data)
  217.         return AVERROR(ENOMEM);
  218.     ret = av_samples_alloc(*audio_data, linesize, nb_channels,
  219.                            nb_samples, sample_fmt, align);
  220.     if (ret < 0)
  221.         av_freep(audio_data);
  222.     return ret;
  223. }
  224.  
  225. int av_samples_copy(uint8_t **dst, uint8_t * const *src, int dst_offset,
  226.                     int src_offset, int nb_samples, int nb_channels,
  227.                     enum AVSampleFormat sample_fmt)
  228. {
  229.     int planar      = av_sample_fmt_is_planar(sample_fmt);
  230.     int planes      = planar ? nb_channels : 1;
  231.     int block_align = av_get_bytes_per_sample(sample_fmt) * (planar ? 1 : nb_channels);
  232.     int data_size   = nb_samples * block_align;
  233.     int i;
  234.  
  235.     dst_offset *= block_align;
  236.     src_offset *= block_align;
  237.  
  238.     if((dst[0] < src[0] ? src[0] - dst[0] : dst[0] - src[0]) >= data_size) {
  239.         for (i = 0; i < planes; i++)
  240.             memcpy(dst[i] + dst_offset, src[i] + src_offset, data_size);
  241.     } else {
  242.         for (i = 0; i < planes; i++)
  243.             memmove(dst[i] + dst_offset, src[i] + src_offset, data_size);
  244.     }
  245.  
  246.     return 0;
  247. }
  248.  
  249. int av_samples_set_silence(uint8_t **audio_data, int offset, int nb_samples,
  250.                            int nb_channels, enum AVSampleFormat sample_fmt)
  251. {
  252.     int planar      = av_sample_fmt_is_planar(sample_fmt);
  253.     int planes      = planar ? nb_channels : 1;
  254.     int block_align = av_get_bytes_per_sample(sample_fmt) * (planar ? 1 : nb_channels);
  255.     int data_size   = nb_samples * block_align;
  256.     int fill_char   = (sample_fmt == AV_SAMPLE_FMT_U8 ||
  257.                      sample_fmt == AV_SAMPLE_FMT_U8P) ? 0x80 : 0x00;
  258.     int i;
  259.  
  260.     offset *= block_align;
  261.  
  262.     for (i = 0; i < planes; i++)
  263.         memset(audio_data[i] + offset, fill_char, data_size);
  264.  
  265.     return 0;
  266. }
  267.