blob: 290dab41a5ba1446c23aefab84e8134ff090702c
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 | static av_cold int cinaudio_decode_init(AVCodecContext *avctx) |
77 | { |
78 | CinAudioContext *cin = avctx->priv_data; |
79 | |
80 | cin->initial_decode_frame = 1; |
81 | cin->delta = 0; |
82 | avctx->sample_fmt = AV_SAMPLE_FMT_S16; |
83 | avctx->channels = 1; |
84 | avctx->channel_layout = AV_CH_LAYOUT_MONO; |
85 | |
86 | return 0; |
87 | } |
88 | |
89 | static int cinaudio_decode_frame(AVCodecContext *avctx, void *data, |
90 | int *got_frame_ptr, AVPacket *avpkt) |
91 | { |
92 | AVFrame *frame = data; |
93 | const uint8_t *buf = avpkt->data; |
94 | CinAudioContext *cin = avctx->priv_data; |
95 | const uint8_t *buf_end = buf + avpkt->size; |
96 | int16_t *samples; |
97 | int delta, ret; |
98 | |
99 | /* get output buffer */ |
100 | frame->nb_samples = avpkt->size - cin->initial_decode_frame; |
101 | if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) |
102 | return ret; |
103 | samples = (int16_t *)frame->data[0]; |
104 | |
105 | delta = cin->delta; |
106 | if (cin->initial_decode_frame) { |
107 | cin->initial_decode_frame = 0; |
108 | delta = sign_extend(AV_RL16(buf), 16); |
109 | buf += 2; |
110 | *samples++ = delta; |
111 | } |
112 | while (buf < buf_end) { |
113 | delta += cinaudio_delta16_table[*buf++]; |
114 | delta = av_clip_int16(delta); |
115 | *samples++ = delta; |
116 | } |
117 | cin->delta = delta; |
118 | |
119 | *got_frame_ptr = 1; |
120 | |
121 | 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 | }; |
134 |