/*
  * Delphine Software International CIN audio decoder
  * Copyright (c) 2006 Gregory Montoir (cyx@users.sourceforge.net)
  *

  * 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
  */
 
 /**
  * @file
  * Delphine Software International CIN audio decoder
  */
 
 #include "libavutil/channel_layout.h"
 
 #include "avcodec.h"
 #include "bytestream.h"
 #include "internal.h"
 #include "mathops.h"
 
 typedef struct CinAudioContext {
     int initial_decode_frame;
     int delta;
 } CinAudioContext;
 
 
 /* table defining a geometric sequence with multiplier = 32767 ^ (1 / 128) */
 static const int16_t cinaudio_delta16_table[256] = {
          0,      0,      0,      0,      0,      0,      0,      0,
          0,      0,      0,      0,      0,      0,      0,      0,
          0,      0,      0, -30210, -27853, -25680, -23677, -21829,
     -20126, -18556, -17108, -15774, -14543, -13408, -12362, -11398,
     -10508,  -9689,  -8933,  -8236,  -7593,  -7001,  -6455,  -5951,
      -5487,  -5059,  -4664,  -4300,  -3964,  -3655,  -3370,  -3107,
      -2865,  -2641,  -2435,  -2245,  -2070,  -1908,  -1759,  -1622,
      -1495,  -1379,  -1271,  -1172,  -1080,   -996,   -918,   -847,
       -781,   -720,   -663,   -612,   -564,   -520,   -479,   -442,
       -407,   -376,   -346,   -319,   -294,   -271,   -250,   -230,
       -212,   -196,   -181,   -166,   -153,   -141,   -130,   -120,
       -111,   -102,    -94,    -87,    -80,    -74,    -68,    -62,
        -58,    -53,    -49,    -45,    -41,    -38,    -35,    -32,
        -30,    -27,    -25,    -23,    -21,    -20,    -18,    -17,
        -15,    -14,    -13,    -12,    -11,    -10,     -9,     -8,
         -7,     -6,     -5,     -4,     -3,     -2,     -1,      0,
          0,      1,      2,      3,      4,      5,      6,      7,
          8,      9,     10,     11,     12,     13,     14,     15,
         17,     18,     20,     21,     23,     25,     27,     30,
         32,     35,     38,     41,     45,     49,     53,     58,
         62,     68,     74,     80,     87,     94,    102,    111,
        120,    130,    141,    153,    166,    181,    196,    212,
        230,    250,    271,    294,    319,    346,    376,    407,
        442,    479,    520,    564,    612,    663,    720,    781,
        847,    918,    996,   1080,   1172,   1271,   1379,   1495,
       1622,   1759,   1908,   2070,   2245,   2435,   2641,   2865,
       3107,   3370,   3655,   3964,   4300,   4664,   5059,   5487,
       5951,   6455,   7001,   7593,   8236,   8933,   9689,  10508,
      11398,  12362,  13408,  14543,  15774,  17108,  18556,  20126,
      21829,  23677,  25680,  27853,  30210,      0,      0,      0,
          0,      0,      0,      0,      0,      0,      0,      0,
          0,      0,      0,      0,      0,      0,      0,      0
 };
 
 static av_cold int cinaudio_decode_init(AVCodecContext *avctx)
 {
     CinAudioContext *cin = avctx->priv_data;
 
     cin->initial_decode_frame = 1;
     cin->delta                = 0;
     avctx->sample_fmt         = AV_SAMPLE_FMT_S16;
     avctx->channels           = 1;
     avctx->channel_layout     = AV_CH_LAYOUT_MONO;
 
     return 0;
 }
 
 static int cinaudio_decode_frame(AVCodecContext *avctx, void *data,
                                  int *got_frame_ptr, AVPacket *avpkt)
 {
     AVFrame *frame         = data;
     const uint8_t *buf     = avpkt->data;
     CinAudioContext *cin   = avctx->priv_data;
     const uint8_t *buf_end = buf + avpkt->size;
     int16_t *samples;
     int delta, ret;
 
     /* get output buffer */
     frame->nb_samples = avpkt->size - cin->initial_decode_frame;

     if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)

         return ret;
     samples = (int16_t *)frame->data[0];
 
     delta = cin->delta;
     if (cin->initial_decode_frame) {
         cin->initial_decode_frame = 0;
         delta                     = sign_extend(AV_RL16(buf), 16);
         buf                      += 2;
         *samples++                = delta;
     }
     while (buf < buf_end) {
         delta     += cinaudio_delta16_table[*buf++];
         delta      = av_clip_int16(delta);
         *samples++ = delta;
     }
     cin->delta = delta;
 
     *got_frame_ptr = 1;
 
     return avpkt->size;
 }
 
 AVCodec ff_dsicinaudio_decoder = {
     .name           = "dsicinaudio",
     .long_name      = NULL_IF_CONFIG_SMALL("Delphine Software International CIN audio"),
     .type           = AVMEDIA_TYPE_AUDIO,
     .id             = AV_CODEC_ID_DSICINAUDIO,
     .priv_data_size = sizeof(CinAudioContext),
     .init           = cinaudio_decode_init,
     .decode         = cinaudio_decode_frame,

     .capabilities   = AV_CODEC_CAP_DR1,

 };