repositories / deb_ffmpeg.git / blame
| Commit | Line | Data |
|---|---|---|
| 2ba45a60 DM |
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 = CODEC_CAP_DR1, | |
| 133 | }; |