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  1. /*
  2.  * DCA compatible decoder data
  3.  * Copyright (C) 2004 Gildas Bazin
  4.  * Copyright (C) 2004 Benjamin Zores
  5.  * Copyright (C) 2006 Benjamin Larsson
  6.  * Copyright (C) 2007 Konstantin Shishkov
  7.  *
  8.  * This file is part of FFmpeg.
  9.  *
  10.  * FFmpeg is free software; you can redistribute it and/or
  11.  * modify it under the terms of the GNU Lesser General Public
  12.  * License as published by the Free Software Foundation; either
  13.  * version 2.1 of the License, or (at your option) any later version.
  14.  *
  15.  * FFmpeg is distributed in the hope that it will be useful,
  16.  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  18.  * Lesser General Public License for more details.
  19.  *
  20.  * You should have received a copy of the GNU Lesser General Public
  21.  * License along with FFmpeg; if not, write to the Free Software
  22.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  23.  */
  24.  
  25. #include <stdint.h>
  26. #include <string.h>
  27.  
  28. #include "libavutil/error.h"
  29.  
  30. #include "dca.h"
  31. #include "dca_syncwords.h"
  32. #include "put_bits.h"
  33.  
  34. const uint32_t avpriv_dca_sample_rates[16] = {
  35.     0, 8000, 16000, 32000, 0, 0, 11025, 22050, 44100, 0, 0,
  36.     12000, 24000, 48000, 96000, 192000
  37. };
  38.  
  39. int avpriv_dca_convert_bitstream(const uint8_t *src, int src_size, uint8_t *dst,
  40.                              int max_size)
  41. {
  42.     uint32_t mrk;
  43.     int i, tmp;
  44.     const uint16_t *ssrc = (const uint16_t *) src;
  45.     uint16_t *sdst = (uint16_t *) dst;
  46.     PutBitContext pb;
  47.  
  48.     if ((unsigned) src_size > (unsigned) max_size)
  49.         src_size = max_size;
  50.  
  51.     mrk = AV_RB32(src);
  52.     switch (mrk) {
  53.     case DCA_SYNCWORD_CORE_BE:
  54.         memcpy(dst, src, src_size);
  55.         return src_size;
  56.     case DCA_SYNCWORD_CORE_LE:
  57.         for (i = 0; i < (src_size + 1) >> 1; i++)
  58.             *sdst++ = av_bswap16(*ssrc++);
  59.         return src_size;
  60.     case DCA_SYNCWORD_CORE_14B_BE:
  61.     case DCA_SYNCWORD_CORE_14B_LE:
  62.         init_put_bits(&pb, dst, max_size);
  63.         for (i = 0; i < (src_size + 1) >> 1; i++, src += 2) {
  64.             tmp = ((mrk == DCA_SYNCWORD_CORE_14B_BE) ? AV_RB16(src) : AV_RL16(src)) & 0x3FFF;
  65.             put_bits(&pb, 14, tmp);
  66.         }
  67.         flush_put_bits(&pb);
  68.         return (put_bits_count(&pb) + 7) >> 3;
  69.     default:
  70.         return AVERROR_INVALIDDATA;
  71.     }
  72. }
  73.