LCOV - code coverage report
Current view: top level - libavcodec - dsicinaudio.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 29 30 96.7 %
Date: 2017-12-17 04:34:43 Functions: 2 2 100.0 %

          Line data    Source code
       1             : /*
       2             :  * Delphine Software International CIN audio decoder
       3             :  * Copyright (c) 2006 Gregory Montoir (cyx@users.sourceforge.net)
       4             :  *
       5             :  * This file is part of FFmpeg.
       6             :  *
       7             :  * FFmpeg is free software; you can redistribute it and/or
       8             :  * modify it under the terms of the GNU Lesser General Public
       9             :  * License as published by the Free Software Foundation; either
      10             :  * version 2.1 of the License, or (at your option) any later version.
      11             :  *
      12             :  * FFmpeg is distributed in the hope that it will be useful,
      13             :  * but WITHOUT ANY WARRANTY; without even the implied warranty of
      14             :  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      15             :  * Lesser General Public License for more details.
      16             :  *
      17             :  * You should have received a copy of the GNU Lesser General Public
      18             :  * License along with FFmpeg; if not, write to the Free Software
      19             :  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
      20             :  */
      21             : 
      22             : /**
      23             :  * @file
      24             :  * Delphine Software International CIN audio decoder
      25             :  */
      26             : 
      27             : #include "libavutil/channel_layout.h"
      28             : 
      29             : #include "avcodec.h"
      30             : #include "bytestream.h"
      31             : #include "internal.h"
      32             : #include "mathops.h"
      33             : 
      34             : typedef struct CinAudioContext {
      35             :     int initial_decode_frame;
      36             :     int delta;
      37             : } CinAudioContext;
      38             : 
      39             : 
      40             : /* table defining a geometric sequence with multiplier = 32767 ^ (1 / 128) */
      41             : static const int16_t cinaudio_delta16_table[256] = {
      42             :          0,      0,      0,      0,      0,      0,      0,      0,
      43             :          0,      0,      0,      0,      0,      0,      0,      0,
      44             :          0,      0,      0, -30210, -27853, -25680, -23677, -21829,
      45             :     -20126, -18556, -17108, -15774, -14543, -13408, -12362, -11398,
      46             :     -10508,  -9689,  -8933,  -8236,  -7593,  -7001,  -6455,  -5951,
      47             :      -5487,  -5059,  -4664,  -4300,  -3964,  -3655,  -3370,  -3107,
      48             :      -2865,  -2641,  -2435,  -2245,  -2070,  -1908,  -1759,  -1622,
      49             :      -1495,  -1379,  -1271,  -1172,  -1080,   -996,   -918,   -847,
      50             :       -781,   -720,   -663,   -612,   -564,   -520,   -479,   -442,
      51             :       -407,   -376,   -346,   -319,   -294,   -271,   -250,   -230,
      52             :       -212,   -196,   -181,   -166,   -153,   -141,   -130,   -120,
      53             :       -111,   -102,    -94,    -87,    -80,    -74,    -68,    -62,
      54             :        -58,    -53,    -49,    -45,    -41,    -38,    -35,    -32,
      55             :        -30,    -27,    -25,    -23,    -21,    -20,    -18,    -17,
      56             :        -15,    -14,    -13,    -12,    -11,    -10,     -9,     -8,
      57             :         -7,     -6,     -5,     -4,     -3,     -2,     -1,      0,
      58             :          0,      1,      2,      3,      4,      5,      6,      7,
      59             :          8,      9,     10,     11,     12,     13,     14,     15,
      60             :         17,     18,     20,     21,     23,     25,     27,     30,
      61             :         32,     35,     38,     41,     45,     49,     53,     58,
      62             :         62,     68,     74,     80,     87,     94,    102,    111,
      63             :        120,    130,    141,    153,    166,    181,    196,    212,
      64             :        230,    250,    271,    294,    319,    346,    376,    407,
      65             :        442,    479,    520,    564,    612,    663,    720,    781,
      66             :        847,    918,    996,   1080,   1172,   1271,   1379,   1495,
      67             :       1622,   1759,   1908,   2070,   2245,   2435,   2641,   2865,
      68             :       3107,   3370,   3655,   3964,   4300,   4664,   5059,   5487,
      69             :       5951,   6455,   7001,   7593,   8236,   8933,   9689,  10508,
      70             :      11398,  12362,  13408,  14543,  15774,  17108,  18556,  20126,
      71             :      21829,  23677,  25680,  27853,  30210,      0,      0,      0,
      72             :          0,      0,      0,      0,      0,      0,      0,      0,
      73             :          0,      0,      0,      0,      0,      0,      0,      0
      74             : };
      75             : 
      76           3 : static av_cold int cinaudio_decode_init(AVCodecContext *avctx)
      77             : {
      78           3 :     CinAudioContext *cin = avctx->priv_data;
      79             : 
      80           3 :     cin->initial_decode_frame = 1;
      81           3 :     cin->delta                = 0;
      82           3 :     avctx->sample_fmt         = AV_SAMPLE_FMT_S16;
      83           3 :     avctx->channels           = 1;
      84           3 :     avctx->channel_layout     = AV_CH_LAYOUT_MONO;
      85             : 
      86           3 :     return 0;
      87             : }
      88             : 
      89          91 : static int cinaudio_decode_frame(AVCodecContext *avctx, void *data,
      90             :                                  int *got_frame_ptr, AVPacket *avpkt)
      91             : {
      92          91 :     AVFrame *frame         = data;
      93          91 :     const uint8_t *buf     = avpkt->data;
      94          91 :     CinAudioContext *cin   = avctx->priv_data;
      95          91 :     const uint8_t *buf_end = buf + avpkt->size;
      96             :     int16_t *samples;
      97             :     int delta, ret;
      98             : 
      99             :     /* get output buffer */
     100          91 :     frame->nb_samples = avpkt->size - cin->initial_decode_frame;
     101          91 :     if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
     102           0 :         return ret;
     103          91 :     samples = (int16_t *)frame->data[0];
     104             : 
     105          91 :     delta = cin->delta;
     106          91 :     if (cin->initial_decode_frame) {
     107           1 :         cin->initial_decode_frame = 0;
     108           1 :         delta                     = sign_extend(AV_RL16(buf), 16);
     109           1 :         buf                      += 2;
     110           1 :         *samples++                = delta;
     111             :     }
     112      253825 :     while (buf < buf_end) {
     113      253643 :         delta     += cinaudio_delta16_table[*buf++];
     114      253643 :         delta      = av_clip_int16(delta);
     115      253643 :         *samples++ = delta;
     116             :     }
     117          91 :     cin->delta = delta;
     118             : 
     119          91 :     *got_frame_ptr = 1;
     120             : 
     121          91 :     return avpkt->size;
     122             : }
     123             : 
     124             : AVCodec ff_dsicinaudio_decoder = {
     125             :     .name           = "dsicinaudio",
     126             :     .long_name      = NULL_IF_CONFIG_SMALL("Delphine Software International CIN audio"),
     127             :     .type           = AVMEDIA_TYPE_AUDIO,
     128             :     .id             = AV_CODEC_ID_DSICINAUDIO,
     129             :     .priv_data_size = sizeof(CinAudioContext),
     130             :     .init           = cinaudio_decode_init,
     131             :     .decode         = cinaudio_decode_frame,
     132             :     .capabilities   = AV_CODEC_CAP_DR1,
     133             : };

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