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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 "put_bits.h"
  29. #include "dca.h"
  30.  
  31. const uint32_t avpriv_dca_sample_rates[16] =
  32. {
  33.     0, 8000, 16000, 32000, 0, 0, 11025, 22050, 44100, 0, 0,
  34.     12000, 24000, 48000, 96000, 192000
  35. };
  36.  
  37. int ff_dca_convert_bitstream(const uint8_t *src, int src_size, uint8_t *dst,
  38.                              int max_size)
  39. {
  40.     uint32_t mrk;
  41.     int i, tmp;
  42.     const uint16_t *ssrc = (const uint16_t *) src;
  43.     uint16_t *sdst = (uint16_t *) dst;
  44.     PutBitContext pb;
  45.  
  46.     if ((unsigned) src_size > (unsigned) max_size)
  47.         src_size = max_size;
  48.  
  49.     mrk = AV_RB32(src);
  50.     switch (mrk) {
  51.     case DCA_MARKER_RAW_BE:
  52.         memcpy(dst, src, src_size);
  53.         return src_size;
  54.     case DCA_MARKER_RAW_LE:
  55.         for (i = 0; i < (src_size + 1) >> 1; i++)
  56.             *sdst++ = av_bswap16(*ssrc++);
  57.         return src_size;
  58.     case DCA_MARKER_14B_BE:
  59.     case DCA_MARKER_14B_LE:
  60.         init_put_bits(&pb, dst, max_size);
  61.         for (i = 0; i < (src_size + 1) >> 1; i++, src += 2) {
  62.             tmp = ((mrk == DCA_MARKER_14B_BE) ? AV_RB16(src) : AV_RL16(src)) & 0x3FFF;
  63.             put_bits(&pb, 14, tmp);
  64.         }
  65.         flush_put_bits(&pb);
  66.         return (put_bits_count(&pb) + 7) >> 3;
  67.     default:
  68.         return AVERROR_INVALIDDATA;
  69.     }
  70. }
  71.