| 1 | /*
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| 2 | * Assorted DPCM codecs
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| 3 | * Copyright (c) 2003 The ffmpeg Project.
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| 4 | *
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| 5 | * This library is free software; you can redistribute it and/or
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| 6 | * modify it under the terms of the GNU Lesser General Public
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| 7 | * License as published by the Free Software Foundation; either
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| 8 | * version 2 of the License, or (at your option) any later version.
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| 9 | *
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| 10 | * This library is distributed in the hope that it will be useful,
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| 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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| 13 | * Lesser General Public License for more details.
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| 14 | *
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| 15 | * You should have received a copy of the GNU Lesser General Public
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| 16 | * License along with this library; if not, write to the Free Software
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| 17 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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| 18 | */
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| 19 |
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| 20 | /**
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| 21 | * @file: dpcm.c
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| 22 | * Assorted DPCM (differential pulse code modulation) audio codecs
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| 23 | * by Mike Melanson (melanson@pcisys.net)
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| 24 | * Xan DPCM decoder by Mario Brito (mbrito@student.dei.uc.pt)
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| 25 | * for more information on the specific data formats, visit:
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| 26 | * http://www.pcisys.net/~melanson/codecs/simpleaudio.html
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| 27 | * SOL DPCMs implemented by Konstantin Shishkov
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| 28 | *
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| 29 | * Note about using the Xan DPCM decoder: Xan DPCM is used in AVI files
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| 30 | * found in the Wing Commander IV computer game. These AVI files contain
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| 31 | * WAVEFORMAT headers which report the audio format as 0x01: raw PCM.
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| 32 | * Clearly incorrect. To detect Xan DPCM, you will probably have to
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| 33 | * special-case your AVI demuxer to use Xan DPCM if the file uses 'Xxan'
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| 34 | * (Xan video) for its video codec. Alternately, such AVI files also contain
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| 35 | * the fourcc 'Axan' in the 'auds' chunk of the AVI header.
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| 36 | */
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| 37 |
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| 38 | #include "avcodec.h"
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| 39 |
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| 40 | typedef struct DPCMContext {
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| 41 | int channels;
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| 42 | short roq_square_array[256];
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| 43 | long sample[2];//for SOL_DPCM
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| 44 | const int *sol_table;//for SOL_DPCM
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| 45 | } DPCMContext;
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| 46 |
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| 47 | #define SATURATE_S16(x) if (x < -32768) x = -32768; \
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| 48 | else if (x > 32767) x = 32767;
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| 49 | #define SE_16BIT(x) if (x & 0x8000) x -= 0x10000;
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| 50 |
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| 51 | static int interplay_delta_table[] = {
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| 52 | 0, 1, 2, 3, 4, 5, 6, 7,
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| 53 | 8, 9, 10, 11, 12, 13, 14, 15,
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| 54 | 16, 17, 18, 19, 20, 21, 22, 23,
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| 55 | 24, 25, 26, 27, 28, 29, 30, 31,
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| 56 | 32, 33, 34, 35, 36, 37, 38, 39,
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| 57 | 40, 41, 42, 43, 47, 51, 56, 61,
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| 58 | 66, 72, 79, 86, 94, 102, 112, 122,
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| 59 | 133, 145, 158, 173, 189, 206, 225, 245,
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| 60 | 267, 292, 318, 348, 379, 414, 452, 493,
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| 61 | 538, 587, 640, 699, 763, 832, 908, 991,
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| 62 | 1081, 1180, 1288, 1405, 1534, 1673, 1826, 1993,
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| 63 | 2175, 2373, 2590, 2826, 3084, 3365, 3672, 4008,
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| 64 | 4373, 4772, 5208, 5683, 6202, 6767, 7385, 8059,
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| 65 | 8794, 9597, 10472, 11428, 12471, 13609, 14851, 16206,
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| 66 | 17685, 19298, 21060, 22981, 25078, 27367, 29864, 32589,
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| 67 | -29973, -26728, -23186, -19322, -15105, -10503, -5481, -1,
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| 68 | 1, 1, 5481, 10503, 15105, 19322, 23186, 26728,
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| 69 | 29973, -32589, -29864, -27367, -25078, -22981, -21060, -19298,
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| 70 | -17685, -16206, -14851, -13609, -12471, -11428, -10472, -9597,
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| 71 | -8794, -8059, -7385, -6767, -6202, -5683, -5208, -4772,
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| 72 | -4373, -4008, -3672, -3365, -3084, -2826, -2590, -2373,
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| 73 | -2175, -1993, -1826, -1673, -1534, -1405, -1288, -1180,
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| 74 | -1081, -991, -908, -832, -763, -699, -640, -587,
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| 75 | -538, -493, -452, -414, -379, -348, -318, -292,
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| 76 | -267, -245, -225, -206, -189, -173, -158, -145,
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| 77 | -133, -122, -112, -102, -94, -86, -79, -72,
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| 78 | -66, -61, -56, -51, -47, -43, -42, -41,
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| 79 | -40, -39, -38, -37, -36, -35, -34, -33,
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| 80 | -32, -31, -30, -29, -28, -27, -26, -25,
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| 81 | -24, -23, -22, -21, -20, -19, -18, -17,
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| 82 | -16, -15, -14, -13, -12, -11, -10, -9,
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| 83 | -8, -7, -6, -5, -4, -3, -2, -1
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| 84 |
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| 85 | };
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| 86 |
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| 87 | static const int sol_table_old[16] =
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| 88 | { 0x0, 0x1, 0x2 , 0x3, 0x6, 0xA, 0xF, 0x15,
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| 89 | -0x15, -0xF, -0xA, -0x6, -0x3, -0x2, -0x1, 0x0};
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| 90 |
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| 91 | static const int sol_table_new[16] =
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| 92 | { 0x0, 0x1, 0x2, 0x3, 0x6, 0xA, 0xF, 0x15,
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| 93 | 0x0, -0x1, -0x2, -0x3, -0x6, -0xA, -0xF, -0x15};
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| 94 |
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| 95 | static const int sol_table_16[128] = {
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| 96 | 0x000, 0x008, 0x010, 0x020, 0x030, 0x040, 0x050, 0x060, 0x070, 0x080,
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| 97 | 0x090, 0x0A0, 0x0B0, 0x0C0, 0x0D0, 0x0E0, 0x0F0, 0x100, 0x110, 0x120,
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| 98 | 0x130, 0x140, 0x150, 0x160, 0x170, 0x180, 0x190, 0x1A0, 0x1B0, 0x1C0,
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| 99 | 0x1D0, 0x1E0, 0x1F0, 0x200, 0x208, 0x210, 0x218, 0x220, 0x228, 0x230,
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| 100 | 0x238, 0x240, 0x248, 0x250, 0x258, 0x260, 0x268, 0x270, 0x278, 0x280,
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| 101 | 0x288, 0x290, 0x298, 0x2A0, 0x2A8, 0x2B0, 0x2B8, 0x2C0, 0x2C8, 0x2D0,
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| 102 | 0x2D8, 0x2E0, 0x2E8, 0x2F0, 0x2F8, 0x300, 0x308, 0x310, 0x318, 0x320,
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| 103 | 0x328, 0x330, 0x338, 0x340, 0x348, 0x350, 0x358, 0x360, 0x368, 0x370,
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| 104 | 0x378, 0x380, 0x388, 0x390, 0x398, 0x3A0, 0x3A8, 0x3B0, 0x3B8, 0x3C0,
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| 105 | 0x3C8, 0x3D0, 0x3D8, 0x3E0, 0x3E8, 0x3F0, 0x3F8, 0x400, 0x440, 0x480,
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| 106 | 0x4C0, 0x500, 0x540, 0x580, 0x5C0, 0x600, 0x640, 0x680, 0x6C0, 0x700,
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| 107 | 0x740, 0x780, 0x7C0, 0x800, 0x900, 0xA00, 0xB00, 0xC00, 0xD00, 0xE00,
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| 108 | 0xF00, 0x1000, 0x1400, 0x1800, 0x1C00, 0x2000, 0x3000, 0x4000
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| 109 | };
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| 110 |
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| 111 |
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| 112 |
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| 113 | static int dpcm_decode_init(AVCodecContext *avctx)
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| 114 | {
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| 115 | DPCMContext *s = avctx->priv_data;
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| 116 | int i;
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| 117 | short square;
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| 118 |
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| 119 | s->channels = avctx->channels;
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| 120 | s->sample[0] = s->sample[1] = 0;
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| 121 |
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| 122 | switch(avctx->codec->id) {
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| 123 |
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| 124 | case CODEC_ID_ROQ_DPCM:
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| 125 | /* initialize square table */
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| 126 | for (i = 0; i < 128; i++) {
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| 127 | square = i * i;
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| 128 | s->roq_square_array[i] = square;
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| 129 | s->roq_square_array[i + 128] = -square;
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| 130 | }
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| 131 | break;
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| 132 |
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| 133 |
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| 134 | case CODEC_ID_SOL_DPCM:
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| 135 | switch(avctx->codec_tag){
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| 136 | case 1:
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| 137 | s->sol_table=sol_table_old;
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| 138 | s->sample[0] = s->sample[1] = 0x80;
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| 139 | break;
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| 140 | case 2:
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| 141 | s->sol_table=sol_table_new;
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| 142 | s->sample[0] = s->sample[1] = 0x80;
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| 143 | break;
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| 144 | case 3:
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| 145 | s->sol_table=sol_table_16;
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| 146 | break;
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| 147 | default:
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| 148 | av_log(avctx, AV_LOG_ERROR, "Unknown SOL subcodec\n");
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| 149 | return -1;
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| 150 | }
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| 151 | break;
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| 152 |
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| 153 | default:
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| 154 | break;
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| 155 | }
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| 156 |
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| 157 | return 0;
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| 158 | }
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| 159 |
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| 160 | static int dpcm_decode_frame(AVCodecContext *avctx,
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| 161 | void *data, int *data_size,
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| 162 | uint8_t *buf, int buf_size)
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| 163 | {
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| 164 | DPCMContext *s = avctx->priv_data;
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| 165 | int in, out = 0;
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| 166 | int predictor[2];
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| 167 | int channel_number = 0;
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| 168 | short *output_samples = data;
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| 169 | int shift[2];
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| 170 | unsigned char byte;
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| 171 | short diff;
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| 172 |
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| 173 | if (!buf_size)
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| 174 | return 0;
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| 175 |
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| 176 | switch(avctx->codec->id) {
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| 177 |
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| 178 | case CODEC_ID_ROQ_DPCM:
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| 179 | if (s->channels == 1)
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| 180 | predictor[0] = LE_16(&buf[6]);
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| 181 | else {
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| 182 | predictor[0] = buf[7] << 8;
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| 183 | predictor[1] = buf[6] << 8;
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| 184 | }
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| 185 | SE_16BIT(predictor[0]);
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| 186 | SE_16BIT(predictor[1]);
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| 187 |
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| 188 | /* decode the samples */
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| 189 | for (in = 8, out = 0; in < buf_size; in++, out++) {
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| 190 | predictor[channel_number] += s->roq_square_array[buf[in]];
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| 191 | SATURATE_S16(predictor[channel_number]);
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| 192 | output_samples[out] = predictor[channel_number];
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| 193 |
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| 194 | /* toggle channel */
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| 195 | channel_number ^= s->channels - 1;
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| 196 | }
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| 197 | break;
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| 198 |
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| 199 | case CODEC_ID_INTERPLAY_DPCM:
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| 200 | in = 6; /* skip over the stream mask and stream length */
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| 201 | predictor[0] = LE_16(&buf[in]);
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| 202 | in += 2;
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| 203 | SE_16BIT(predictor[0])
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| 204 | output_samples[out++] = predictor[0];
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| 205 | if (s->channels == 2) {
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| 206 | predictor[1] = LE_16(&buf[in]);
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| 207 | in += 2;
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| 208 | SE_16BIT(predictor[1])
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| 209 | output_samples[out++] = predictor[1];
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| 210 | }
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| 211 |
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| 212 | while (in < buf_size) {
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| 213 | predictor[channel_number] += interplay_delta_table[buf[in++]];
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| 214 | SATURATE_S16(predictor[channel_number]);
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| 215 | output_samples[out++] = predictor[channel_number];
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| 216 |
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| 217 | /* toggle channel */
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| 218 | channel_number ^= s->channels - 1;
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| 219 | }
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| 220 |
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| 221 | break;
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| 222 |
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| 223 | case CODEC_ID_XAN_DPCM:
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| 224 | in = 0;
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| 225 | shift[0] = shift[1] = 4;
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| 226 | predictor[0] = LE_16(&buf[in]);
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| 227 | in += 2;
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| 228 | SE_16BIT(predictor[0]);
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| 229 | if (s->channels == 2) {
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| 230 | predictor[1] = LE_16(&buf[in]);
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| 231 | in += 2;
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| 232 | SE_16BIT(predictor[1]);
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| 233 | }
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| 234 |
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| 235 | while (in < buf_size) {
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| 236 | byte = buf[in++];
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| 237 | diff = (byte & 0xFC) << 8;
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| 238 | if ((byte & 0x03) == 3)
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| 239 | shift[channel_number]++;
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| 240 | else
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| 241 | shift[channel_number] -= (2 * (byte & 3));
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| 242 | /* saturate the shifter to a lower limit of 0 */
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| 243 | if (shift[channel_number] < 0)
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| 244 | shift[channel_number] = 0;
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| 245 |
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| 246 | diff >>= shift[channel_number];
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| 247 | predictor[channel_number] += diff;
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| 248 |
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| 249 | SATURATE_S16(predictor[channel_number]);
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| 250 | output_samples[out++] = predictor[channel_number];
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| 251 |
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| 252 | /* toggle channel */
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| 253 | channel_number ^= s->channels - 1;
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| 254 | }
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| 255 | break;
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| 256 | case CODEC_ID_SOL_DPCM:
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| 257 | in = 0;
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| 258 | if (avctx->codec_tag != 3) {
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| 259 | while (in < buf_size) {
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| 260 | int n1, n2;
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| 261 | n1 = (buf[in] >> 4) & 0xF;
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| 262 | n2 = buf[in++] & 0xF;
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| 263 | s->sample[0] += s->sol_table[n1];
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| 264 | if (s->sample[0] < 0) s->sample[0] = 0;
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| 265 | if (s->sample[0] > 255) s->sample[0] = 255;
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| 266 | output_samples[out++] = (s->sample[0] - 128) << 8;
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| 267 | s->sample[s->channels - 1] += s->sol_table[n2];
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| 268 | if (s->sample[s->channels - 1] < 0) s->sample[s->channels - 1] = 0;
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| 269 | if (s->sample[s->channels - 1] > 255) s->sample[s->channels - 1] = 255;
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| 270 | output_samples[out++] = (s->sample[s->channels - 1] - 128) << 8;
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| 271 | }
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| 272 | } else {
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| 273 | while (in < buf_size) {
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| 274 | int n;
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| 275 | n = buf[in++];
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| 276 | if (n & 0x80) s->sample[channel_number] -= s->sol_table[n & 0x7F];
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| 277 | else s->sample[channel_number] += s->sol_table[n & 0x7F];
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| 278 | SATURATE_S16(s->sample[channel_number]);
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| 279 | output_samples[out++] = s->sample[channel_number];
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| 280 | /* toggle channel */
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| 281 | channel_number ^= s->channels - 1;
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| 282 | }
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| 283 | }
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| 284 | break;
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| 285 | }
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| 286 |
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| 287 | *data_size = out * sizeof(short);
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| 288 | return buf_size;
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| 289 | }
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| 290 |
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| 291 | AVCodec roq_dpcm_decoder = {
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| 292 | "roq_dpcm",
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| 293 | CODEC_TYPE_AUDIO,
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| 294 | CODEC_ID_ROQ_DPCM,
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| 295 | sizeof(DPCMContext),
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| 296 | dpcm_decode_init,
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| 297 | NULL,
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| 298 | NULL,
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| 299 | dpcm_decode_frame,
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| 300 | };
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| 301 |
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| 302 | AVCodec interplay_dpcm_decoder = {
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| 303 | "interplay_dpcm",
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| 304 | CODEC_TYPE_AUDIO,
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| 305 | CODEC_ID_INTERPLAY_DPCM,
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| 306 | sizeof(DPCMContext),
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| 307 | dpcm_decode_init,
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| 308 | NULL,
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| 309 | NULL,
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| 310 | dpcm_decode_frame,
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| 311 | };
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| 312 |
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| 313 | AVCodec xan_dpcm_decoder = {
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| 314 | "xan_dpcm",
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| 315 | CODEC_TYPE_AUDIO,
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| 316 | CODEC_ID_XAN_DPCM,
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| 317 | sizeof(DPCMContext),
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| 318 | dpcm_decode_init,
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| 319 | NULL,
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| 320 | NULL,
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| 321 | dpcm_decode_frame,
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| 322 | };
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| 323 |
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| 324 | AVCodec sol_dpcm_decoder = {
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| 325 | "sol_dpcm",
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| 326 | CODEC_TYPE_AUDIO,
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| 327 | CODEC_ID_SOL_DPCM,
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| 328 | sizeof(DPCMContext),
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| 329 | dpcm_decode_init,
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| 330 | NULL,
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| 331 | NULL,
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| 332 | dpcm_decode_frame,
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| 333 | };
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