| Line | Branch | Exec | Source |
|---|---|---|---|
| 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 | #include "libavutil/intreadwrite.h" | ||
| 29 | |||
| 30 | #include "avcodec.h" | ||
| 31 | #include "codec_internal.h" | ||
| 32 | #include "decode.h" | ||
| 33 | #include "mathops.h" | ||
| 34 | |||
| 35 | typedef struct CinAudioContext { | ||
| 36 | int initial_decode_frame; | ||
| 37 | int delta; | ||
| 38 | } CinAudioContext; | ||
| 39 | |||
| 40 | |||
| 41 | /* table defining a geometric sequence with multiplier = 32767 ^ (1 / 128) */ | ||
| 42 | static const int16_t cinaudio_delta16_table[256] = { | ||
| 43 | 0, 0, 0, 0, 0, 0, 0, 0, | ||
| 44 | 0, 0, 0, 0, 0, 0, 0, 0, | ||
| 45 | 0, 0, 0, -30210, -27853, -25680, -23677, -21829, | ||
| 46 | -20126, -18556, -17108, -15774, -14543, -13408, -12362, -11398, | ||
| 47 | -10508, -9689, -8933, -8236, -7593, -7001, -6455, -5951, | ||
| 48 | -5487, -5059, -4664, -4300, -3964, -3655, -3370, -3107, | ||
| 49 | -2865, -2641, -2435, -2245, -2070, -1908, -1759, -1622, | ||
| 50 | -1495, -1379, -1271, -1172, -1080, -996, -918, -847, | ||
| 51 | -781, -720, -663, -612, -564, -520, -479, -442, | ||
| 52 | -407, -376, -346, -319, -294, -271, -250, -230, | ||
| 53 | -212, -196, -181, -166, -153, -141, -130, -120, | ||
| 54 | -111, -102, -94, -87, -80, -74, -68, -62, | ||
| 55 | -58, -53, -49, -45, -41, -38, -35, -32, | ||
| 56 | -30, -27, -25, -23, -21, -20, -18, -17, | ||
| 57 | -15, -14, -13, -12, -11, -10, -9, -8, | ||
| 58 | -7, -6, -5, -4, -3, -2, -1, 0, | ||
| 59 | 0, 1, 2, 3, 4, 5, 6, 7, | ||
| 60 | 8, 9, 10, 11, 12, 13, 14, 15, | ||
| 61 | 17, 18, 20, 21, 23, 25, 27, 30, | ||
| 62 | 32, 35, 38, 41, 45, 49, 53, 58, | ||
| 63 | 62, 68, 74, 80, 87, 94, 102, 111, | ||
| 64 | 120, 130, 141, 153, 166, 181, 196, 212, | ||
| 65 | 230, 250, 271, 294, 319, 346, 376, 407, | ||
| 66 | 442, 479, 520, 564, 612, 663, 720, 781, | ||
| 67 | 847, 918, 996, 1080, 1172, 1271, 1379, 1495, | ||
| 68 | 1622, 1759, 1908, 2070, 2245, 2435, 2641, 2865, | ||
| 69 | 3107, 3370, 3655, 3964, 4300, 4664, 5059, 5487, | ||
| 70 | 5951, 6455, 7001, 7593, 8236, 8933, 9689, 10508, | ||
| 71 | 11398, 12362, 13408, 14543, 15774, 17108, 18556, 20126, | ||
| 72 | 21829, 23677, 25680, 27853, 30210, 0, 0, 0, | ||
| 73 | 0, 0, 0, 0, 0, 0, 0, 0, | ||
| 74 | 0, 0, 0, 0, 0, 0, 0, 0 | ||
| 75 | }; | ||
| 76 | |||
| 77 | 3 | static av_cold int cinaudio_decode_init(AVCodecContext *avctx) | |
| 78 | { | ||
| 79 | 3 | CinAudioContext *cin = avctx->priv_data; | |
| 80 | |||
| 81 | 3 | cin->initial_decode_frame = 1; | |
| 82 | 3 | cin->delta = 0; | |
| 83 | 3 | avctx->sample_fmt = AV_SAMPLE_FMT_S16; | |
| 84 | 3 | av_channel_layout_uninit(&avctx->ch_layout); | |
| 85 | 3 | avctx->ch_layout = (AVChannelLayout)AV_CHANNEL_LAYOUT_MONO; | |
| 86 | |||
| 87 | 3 | return 0; | |
| 88 | } | ||
| 89 | |||
| 90 | 93 | static int cinaudio_decode_frame(AVCodecContext *avctx, AVFrame *frame, | |
| 91 | int *got_frame_ptr, AVPacket *avpkt) | ||
| 92 | { | ||
| 93 | 93 | const uint8_t *buf = avpkt->data; | |
| 94 | 93 | CinAudioContext *cin = avctx->priv_data; | |
| 95 | 93 | const uint8_t *buf_end = buf + avpkt->size; | |
| 96 | int16_t *samples; | ||
| 97 | int delta, ret; | ||
| 98 | |||
| 99 | /* get output buffer */ | ||
| 100 | 93 | frame->nb_samples = avpkt->size - cin->initial_decode_frame; | |
| 101 |
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93 | if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) |
| 102 | ✗ | return ret; | |
| 103 | 93 | samples = (int16_t *)frame->data[0]; | |
| 104 | |||
| 105 | 93 | delta = cin->delta; | |
| 106 |
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93 | if (cin->initial_decode_frame) { |
| 107 | 3 | cin->initial_decode_frame = 0; | |
| 108 | 3 | delta = sign_extend(AV_RL16(buf), 16); | |
| 109 | 3 | buf += 2; | |
| 110 | 3 | *samples++ = delta; | |
| 111 | } | ||
| 112 |
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430182 | while (buf < buf_end) { |
| 113 | 430089 | delta += cinaudio_delta16_table[*buf++]; | |
| 114 | 430089 | delta = av_clip_int16(delta); | |
| 115 | 430089 | *samples++ = delta; | |
| 116 | } | ||
| 117 | 93 | cin->delta = delta; | |
| 118 | |||
| 119 | 93 | *got_frame_ptr = 1; | |
| 120 | |||
| 121 | 93 | return avpkt->size; | |
| 122 | } | ||
| 123 | |||
| 124 | const FFCodec ff_dsicinaudio_decoder = { | ||
| 125 | .p.name = "dsicinaudio", | ||
| 126 | CODEC_LONG_NAME("Delphine Software International CIN audio"), | ||
| 127 | .p.type = AVMEDIA_TYPE_AUDIO, | ||
| 128 | .p.id = AV_CODEC_ID_DSICINAUDIO, | ||
| 129 | .priv_data_size = sizeof(CinAudioContext), | ||
| 130 | .init = cinaudio_decode_init, | ||
| 131 | FF_CODEC_DECODE_CB(cinaudio_decode_frame), | ||
| 132 | .p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_CHANNEL_CONF, | ||
| 133 | }; | ||
| 134 |