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4349 | Serge | 1 | /* |
2 | * RealAudio Lossless decoder |
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3 | * |
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4 | * Copyright (c) 2012 Konstantin Shishkov |
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5 | * |
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6 | * This file is part of FFmpeg. |
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7 | * |
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8 | * FFmpeg is free software; you can redistribute it and/or |
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9 | * modify it under the terms of the GNU Lesser General Public |
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10 | * License as published by the Free Software Foundation; either |
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11 | * version 2.1 of the License, or (at your option) any later version. |
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12 | * |
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13 | * FFmpeg is distributed in the hope that it will be useful, |
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14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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16 | * Lesser General Public License for more details. |
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17 | * |
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18 | * You should have received a copy of the GNU Lesser General Public |
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19 | * License along with FFmpeg; if not, write to the Free Software |
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20 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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21 | */ |
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22 | |||
23 | /** |
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24 | * @file |
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25 | * This is a decoder for Real Audio Lossless format. |
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26 | * Dedicated to the mastermind behind it, Ralph Wiggum. |
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27 | */ |
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28 | |||
29 | #include "libavutil/attributes.h" |
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30 | #include "libavutil/channel_layout.h" |
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31 | #include "avcodec.h" |
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32 | #include "get_bits.h" |
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33 | #include "golomb.h" |
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34 | #include "internal.h" |
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35 | #include "unary.h" |
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36 | #include "ralfdata.h" |
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37 | |||
38 | #define FILTER_NONE 0 |
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39 | #define FILTER_RAW 642 |
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40 | |||
41 | typedef struct VLCSet { |
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42 | VLC filter_params; |
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43 | VLC bias; |
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44 | VLC coding_mode; |
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45 | VLC filter_coeffs[10][11]; |
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46 | VLC short_codes[15]; |
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47 | VLC long_codes[125]; |
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48 | } VLCSet; |
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49 | |||
50 | #define RALF_MAX_PKT_SIZE 8192 |
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51 | |||
52 | typedef struct RALFContext { |
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53 | int version; |
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54 | int max_frame_size; |
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55 | VLCSet sets[3]; |
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56 | int32_t channel_data[2][4096]; |
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57 | |||
58 | int filter_params; ///< combined filter parameters for the current channel data |
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59 | int filter_length; ///< length of the filter for the current channel data |
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60 | int filter_bits; ///< filter precision for the current channel data |
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61 | int32_t filter[64]; |
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62 | |||
63 | int bias[2]; ///< a constant value added to channel data after filtering |
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64 | |||
65 | int num_blocks; ///< number of blocks inside the frame |
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66 | int sample_offset; |
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67 | int block_size[1 << 12]; ///< size of the blocks |
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68 | int block_pts[1 << 12]; ///< block start time (in milliseconds) |
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69 | |||
70 | uint8_t pkt[16384]; |
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71 | int has_pkt; |
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72 | } RALFContext; |
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73 | |||
74 | #define MAX_ELEMS 644 // no RALF table uses more than that |
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75 | |||
76 | static av_cold int init_ralf_vlc(VLC *vlc, const uint8_t *data, int elems) |
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77 | { |
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78 | uint8_t lens[MAX_ELEMS]; |
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79 | uint16_t codes[MAX_ELEMS]; |
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80 | int counts[17], prefixes[18]; |
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81 | int i, cur_len; |
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82 | int max_bits = 0; |
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83 | int nb = 0; |
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84 | |||
85 | for (i = 0; i <= 16; i++) |
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86 | counts[i] = 0; |
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87 | for (i = 0; i < elems; i++) { |
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88 | cur_len = (nb ? *data & 0xF : *data >> 4) + 1; |
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89 | counts[cur_len]++; |
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90 | max_bits = FFMAX(max_bits, cur_len); |
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91 | lens[i] = cur_len; |
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92 | data += nb; |
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93 | nb ^= 1; |
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94 | } |
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95 | prefixes[1] = 0; |
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96 | for (i = 1; i <= 16; i++) |
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97 | prefixes[i + 1] = (prefixes[i] + counts[i]) << 1; |
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98 | |||
99 | for (i = 0; i < elems; i++) |
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100 | codes[i] = prefixes[lens[i]]++; |
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101 | |||
102 | return ff_init_vlc_sparse(vlc, FFMIN(max_bits, 9), elems, |
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103 | lens, 1, 1, codes, 2, 2, NULL, 0, 0, 0); |
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104 | } |
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105 | |||
106 | static av_cold int decode_close(AVCodecContext *avctx) |
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107 | { |
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108 | RALFContext *ctx = avctx->priv_data; |
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109 | int i, j, k; |
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110 | |||
111 | for (i = 0; i < 3; i++) { |
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112 | ff_free_vlc(&ctx->sets[i].filter_params); |
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113 | ff_free_vlc(&ctx->sets[i].bias); |
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114 | ff_free_vlc(&ctx->sets[i].coding_mode); |
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115 | for (j = 0; j < 10; j++) |
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116 | for (k = 0; k < 11; k++) |
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117 | ff_free_vlc(&ctx->sets[i].filter_coeffs[j][k]); |
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118 | for (j = 0; j < 15; j++) |
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119 | ff_free_vlc(&ctx->sets[i].short_codes[j]); |
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120 | for (j = 0; j < 125; j++) |
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121 | ff_free_vlc(&ctx->sets[i].long_codes[j]); |
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122 | } |
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123 | |||
124 | return 0; |
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125 | } |
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126 | |||
127 | static av_cold int decode_init(AVCodecContext *avctx) |
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128 | { |
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129 | RALFContext *ctx = avctx->priv_data; |
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130 | int i, j, k; |
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131 | int ret; |
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132 | |||
133 | if (avctx->extradata_size < 24 || memcmp(avctx->extradata, "LSD:", 4)) { |
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134 | av_log(avctx, AV_LOG_ERROR, "Extradata is not groovy, dude\n"); |
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135 | return AVERROR_INVALIDDATA; |
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136 | } |
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137 | |||
138 | ctx->version = AV_RB16(avctx->extradata + 4); |
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139 | if (ctx->version != 0x103) { |
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140 | avpriv_request_sample(avctx, "Unknown version %X", ctx->version); |
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141 | return AVERROR_PATCHWELCOME; |
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142 | } |
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143 | |||
144 | avctx->channels = AV_RB16(avctx->extradata + 8); |
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145 | avctx->sample_rate = AV_RB32(avctx->extradata + 12); |
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146 | if (avctx->channels < 1 || avctx->channels > 2 |
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147 | || avctx->sample_rate < 8000 || avctx->sample_rate > 96000) { |
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148 | av_log(avctx, AV_LOG_ERROR, "Invalid coding parameters %d Hz %d ch\n", |
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149 | avctx->sample_rate, avctx->channels); |
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150 | return AVERROR_INVALIDDATA; |
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151 | } |
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152 | avctx->sample_fmt = AV_SAMPLE_FMT_S16P; |
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153 | avctx->channel_layout = (avctx->channels == 2) ? AV_CH_LAYOUT_STEREO |
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154 | : AV_CH_LAYOUT_MONO; |
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155 | |||
156 | ctx->max_frame_size = AV_RB32(avctx->extradata + 16); |
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157 | if (ctx->max_frame_size > (1 << 20) || !ctx->max_frame_size) { |
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158 | av_log(avctx, AV_LOG_ERROR, "invalid frame size %d\n", |
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159 | ctx->max_frame_size); |
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160 | } |
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161 | ctx->max_frame_size = FFMAX(ctx->max_frame_size, avctx->sample_rate); |
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162 | |||
163 | for (i = 0; i < 3; i++) { |
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164 | ret = init_ralf_vlc(&ctx->sets[i].filter_params, filter_param_def[i], |
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165 | FILTERPARAM_ELEMENTS); |
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166 | if (ret < 0) { |
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167 | decode_close(avctx); |
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168 | return ret; |
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169 | } |
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170 | ret = init_ralf_vlc(&ctx->sets[i].bias, bias_def[i], BIAS_ELEMENTS); |
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171 | if (ret < 0) { |
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172 | decode_close(avctx); |
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173 | return ret; |
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174 | } |
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175 | ret = init_ralf_vlc(&ctx->sets[i].coding_mode, coding_mode_def[i], |
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176 | CODING_MODE_ELEMENTS); |
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177 | if (ret < 0) { |
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178 | decode_close(avctx); |
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179 | return ret; |
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180 | } |
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181 | for (j = 0; j < 10; j++) { |
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182 | for (k = 0; k < 11; k++) { |
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183 | ret = init_ralf_vlc(&ctx->sets[i].filter_coeffs[j][k], |
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184 | filter_coeffs_def[i][j][k], |
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185 | FILTER_COEFFS_ELEMENTS); |
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186 | if (ret < 0) { |
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187 | decode_close(avctx); |
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188 | return ret; |
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189 | } |
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190 | } |
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191 | } |
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192 | for (j = 0; j < 15; j++) { |
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193 | ret = init_ralf_vlc(&ctx->sets[i].short_codes[j], |
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194 | short_codes_def[i][j], SHORT_CODES_ELEMENTS); |
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195 | if (ret < 0) { |
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196 | decode_close(avctx); |
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197 | return ret; |
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198 | } |
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199 | } |
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200 | for (j = 0; j < 125; j++) { |
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201 | ret = init_ralf_vlc(&ctx->sets[i].long_codes[j], |
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202 | long_codes_def[i][j], LONG_CODES_ELEMENTS); |
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203 | if (ret < 0) { |
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204 | decode_close(avctx); |
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205 | return ret; |
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206 | } |
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207 | } |
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208 | } |
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209 | |||
210 | return 0; |
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211 | } |
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212 | |||
213 | static inline int extend_code(GetBitContext *gb, int val, int range, int bits) |
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214 | { |
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215 | if (val == 0) { |
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216 | val = -range - get_ue_golomb(gb); |
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217 | } else if (val == range * 2) { |
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218 | val = range + get_ue_golomb(gb); |
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219 | } else { |
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220 | val -= range; |
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221 | } |
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222 | if (bits) |
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223 | val = (val << bits) | get_bits(gb, bits); |
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224 | return val; |
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225 | } |
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226 | |||
227 | static int decode_channel(RALFContext *ctx, GetBitContext *gb, int ch, |
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228 | int length, int mode, int bits) |
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229 | { |
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230 | int i, t; |
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231 | int code_params; |
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232 | VLCSet *set = ctx->sets + mode; |
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233 | VLC *code_vlc; int range, range2, add_bits; |
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234 | int *dst = ctx->channel_data[ch]; |
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235 | |||
236 | ctx->filter_params = get_vlc2(gb, set->filter_params.table, 9, 2); |
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237 | ctx->filter_bits = (ctx->filter_params - 2) >> 6; |
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238 | ctx->filter_length = ctx->filter_params - (ctx->filter_bits << 6) - 1; |
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239 | |||
240 | if (ctx->filter_params == FILTER_RAW) { |
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241 | for (i = 0; i < length; i++) |
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242 | dst[i] = get_bits(gb, bits); |
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243 | ctx->bias[ch] = 0; |
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244 | return 0; |
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245 | } |
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246 | |||
247 | ctx->bias[ch] = get_vlc2(gb, set->bias.table, 9, 2); |
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248 | ctx->bias[ch] = extend_code(gb, ctx->bias[ch], 127, 4); |
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249 | |||
250 | if (ctx->filter_params == FILTER_NONE) { |
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251 | memset(dst, 0, sizeof(*dst) * length); |
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252 | return 0; |
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253 | } |
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254 | |||
255 | if (ctx->filter_params > 1) { |
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256 | int cmode = 0, coeff = 0; |
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257 | VLC *vlc = set->filter_coeffs[ctx->filter_bits] + 5; |
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258 | |||
259 | add_bits = ctx->filter_bits; |
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260 | |||
261 | for (i = 0; i < ctx->filter_length; i++) { |
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262 | t = get_vlc2(gb, vlc[cmode].table, vlc[cmode].bits, 2); |
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263 | t = extend_code(gb, t, 21, add_bits); |
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264 | if (!cmode) |
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265 | coeff -= 12 << add_bits; |
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266 | coeff = t - coeff; |
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267 | ctx->filter[i] = coeff; |
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268 | |||
269 | cmode = coeff >> add_bits; |
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270 | if (cmode < 0) { |
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271 | cmode = -1 - av_log2(-cmode); |
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272 | if (cmode < -5) |
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273 | cmode = -5; |
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274 | } else if (cmode > 0) { |
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275 | cmode = 1 + av_log2(cmode); |
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276 | if (cmode > 5) |
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277 | cmode = 5; |
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278 | } |
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279 | } |
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280 | } |
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281 | |||
282 | code_params = get_vlc2(gb, set->coding_mode.table, set->coding_mode.bits, 2); |
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283 | if (code_params >= 15) { |
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284 | add_bits = av_clip((code_params / 5 - 3) / 2, 0, 10); |
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285 | if (add_bits > 9 && (code_params % 5) != 2) |
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286 | add_bits--; |
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287 | range = 10; |
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288 | range2 = 21; |
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289 | code_vlc = set->long_codes + code_params - 15; |
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290 | } else { |
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291 | add_bits = 0; |
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292 | range = 6; |
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293 | range2 = 13; |
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294 | code_vlc = set->short_codes + code_params; |
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295 | } |
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296 | |||
297 | for (i = 0; i < length; i += 2) { |
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298 | int code1, code2; |
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299 | |||
300 | t = get_vlc2(gb, code_vlc->table, code_vlc->bits, 2); |
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301 | code1 = t / range2; |
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302 | code2 = t % range2; |
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303 | dst[i] = extend_code(gb, code1, range, 0) << add_bits; |
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304 | dst[i + 1] = extend_code(gb, code2, range, 0) << add_bits; |
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305 | if (add_bits) { |
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306 | dst[i] |= get_bits(gb, add_bits); |
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307 | dst[i + 1] |= get_bits(gb, add_bits); |
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308 | } |
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309 | } |
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310 | |||
311 | return 0; |
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312 | } |
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313 | |||
314 | static void apply_lpc(RALFContext *ctx, int ch, int length, int bits) |
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315 | { |
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316 | int i, j, acc; |
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317 | int *audio = ctx->channel_data[ch]; |
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318 | int bias = 1 << (ctx->filter_bits - 1); |
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319 | int max_clip = (1 << bits) - 1, min_clip = -max_clip - 1; |
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320 | |||
321 | for (i = 1; i < length; i++) { |
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322 | int flen = FFMIN(ctx->filter_length, i); |
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323 | |||
324 | acc = 0; |
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325 | for (j = 0; j < flen; j++) |
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326 | acc += ctx->filter[j] * audio[i - j - 1]; |
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327 | if (acc < 0) { |
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328 | acc = (acc + bias - 1) >> ctx->filter_bits; |
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329 | acc = FFMAX(acc, min_clip); |
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330 | } else { |
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331 | acc = (acc + bias) >> ctx->filter_bits; |
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332 | acc = FFMIN(acc, max_clip); |
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333 | } |
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334 | audio[i] += acc; |
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335 | } |
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336 | } |
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337 | |||
338 | static int decode_block(AVCodecContext *avctx, GetBitContext *gb, |
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339 | int16_t *dst0, int16_t *dst1) |
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340 | { |
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341 | RALFContext *ctx = avctx->priv_data; |
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342 | int len, ch, ret; |
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343 | int dmode, mode[2], bits[2]; |
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344 | int *ch0, *ch1; |
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345 | int i, t, t2; |
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346 | |||
347 | len = 12 - get_unary(gb, 0, 6); |
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348 | |||
349 | if (len <= 7) len ^= 1; // codes for length = 6 and 7 are swapped |
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350 | len = 1 << len; |
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351 | |||
352 | if (ctx->sample_offset + len > ctx->max_frame_size) { |
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353 | av_log(avctx, AV_LOG_ERROR, |
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354 | "Decoder's stomach is crying, it ate too many samples\n"); |
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355 | return AVERROR_INVALIDDATA; |
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356 | } |
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357 | |||
358 | if (avctx->channels > 1) |
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359 | dmode = get_bits(gb, 2) + 1; |
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360 | else |
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361 | dmode = 0; |
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362 | |||
363 | mode[0] = (dmode == 4) ? 1 : 0; |
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364 | mode[1] = (dmode >= 2) ? 2 : 0; |
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365 | bits[0] = 16; |
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366 | bits[1] = (mode[1] == 2) ? 17 : 16; |
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367 | |||
368 | for (ch = 0; ch < avctx->channels; ch++) { |
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369 | if ((ret = decode_channel(ctx, gb, ch, len, mode[ch], bits[ch])) < 0) |
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370 | return ret; |
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371 | if (ctx->filter_params > 1 && ctx->filter_params != FILTER_RAW) { |
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372 | ctx->filter_bits += 3; |
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373 | apply_lpc(ctx, ch, len, bits[ch]); |
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374 | } |
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375 | if (get_bits_left(gb) < 0) |
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376 | return AVERROR_INVALIDDATA; |
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377 | } |
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378 | ch0 = ctx->channel_data[0]; |
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379 | ch1 = ctx->channel_data[1]; |
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380 | switch (dmode) { |
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381 | case 0: |
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382 | for (i = 0; i < len; i++) |
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383 | dst0[i] = ch0[i] + ctx->bias[0]; |
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384 | break; |
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385 | case 1: |
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386 | for (i = 0; i < len; i++) { |
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387 | dst0[i] = ch0[i] + ctx->bias[0]; |
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388 | dst1[i] = ch1[i] + ctx->bias[1]; |
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389 | } |
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390 | break; |
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391 | case 2: |
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392 | for (i = 0; i < len; i++) { |
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393 | ch0[i] += ctx->bias[0]; |
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394 | dst0[i] = ch0[i]; |
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395 | dst1[i] = ch0[i] - (ch1[i] + ctx->bias[1]); |
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396 | } |
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397 | break; |
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398 | case 3: |
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399 | for (i = 0; i < len; i++) { |
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400 | t = ch0[i] + ctx->bias[0]; |
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401 | t2 = ch1[i] + ctx->bias[1]; |
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402 | dst0[i] = t + t2; |
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403 | dst1[i] = t; |
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404 | } |
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405 | break; |
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406 | case 4: |
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407 | for (i = 0; i < len; i++) { |
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408 | t = ch1[i] + ctx->bias[1]; |
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409 | t2 = ((ch0[i] + ctx->bias[0]) << 1) | (t & 1); |
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410 | dst0[i] = (t2 + t) / 2; |
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411 | dst1[i] = (t2 - t) / 2; |
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412 | } |
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413 | break; |
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414 | } |
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415 | |||
416 | ctx->sample_offset += len; |
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417 | |||
418 | return 0; |
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419 | } |
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420 | |||
421 | static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame_ptr, |
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422 | AVPacket *avpkt) |
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423 | { |
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424 | RALFContext *ctx = avctx->priv_data; |
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425 | AVFrame *frame = data; |
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426 | int16_t *samples0; |
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427 | int16_t *samples1; |
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428 | int ret; |
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429 | GetBitContext gb; |
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430 | int table_size, table_bytes, i; |
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431 | const uint8_t *src, *block_pointer; |
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432 | int src_size; |
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433 | int bytes_left; |
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434 | |||
435 | if (ctx->has_pkt) { |
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436 | ctx->has_pkt = 0; |
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437 | table_bytes = (AV_RB16(avpkt->data) + 7) >> 3; |
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438 | if (table_bytes + 3 > avpkt->size || avpkt->size > RALF_MAX_PKT_SIZE) { |
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439 | av_log(avctx, AV_LOG_ERROR, "Wrong packet's breath smells of wrong data!\n"); |
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440 | return AVERROR_INVALIDDATA; |
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441 | } |
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442 | if (memcmp(ctx->pkt, avpkt->data, 2 + table_bytes)) { |
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443 | av_log(avctx, AV_LOG_ERROR, "Wrong packet tails are wrong!\n"); |
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444 | return AVERROR_INVALIDDATA; |
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445 | } |
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446 | |||
447 | src = ctx->pkt; |
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448 | src_size = RALF_MAX_PKT_SIZE + avpkt->size; |
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449 | memcpy(ctx->pkt + RALF_MAX_PKT_SIZE, avpkt->data + 2 + table_bytes, |
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450 | avpkt->size - 2 - table_bytes); |
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451 | } else { |
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452 | if (avpkt->size == RALF_MAX_PKT_SIZE) { |
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453 | memcpy(ctx->pkt, avpkt->data, avpkt->size); |
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454 | ctx->has_pkt = 1; |
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455 | *got_frame_ptr = 0; |
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456 | |||
457 | return avpkt->size; |
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458 | } |
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459 | src = avpkt->data; |
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460 | src_size = avpkt->size; |
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461 | } |
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462 | |||
463 | frame->nb_samples = ctx->max_frame_size; |
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464 | if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) |
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465 | return ret; |
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466 | samples0 = (int16_t *)frame->data[0]; |
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467 | samples1 = (int16_t *)frame->data[1]; |
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468 | |||
469 | if (src_size < 5) { |
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470 | av_log(avctx, AV_LOG_ERROR, "too short packets are too short!\n"); |
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471 | return AVERROR_INVALIDDATA; |
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472 | } |
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473 | table_size = AV_RB16(src); |
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474 | table_bytes = (table_size + 7) >> 3; |
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475 | if (src_size < table_bytes + 3) { |
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476 | av_log(avctx, AV_LOG_ERROR, "short packets are short!\n"); |
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477 | return AVERROR_INVALIDDATA; |
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478 | } |
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479 | init_get_bits(&gb, src + 2, table_size); |
||
480 | ctx->num_blocks = 0; |
||
481 | while (get_bits_left(&gb) > 0) { |
||
482 | ctx->block_size[ctx->num_blocks] = get_bits(&gb, 15); |
||
483 | if (get_bits1(&gb)) { |
||
484 | ctx->block_pts[ctx->num_blocks] = get_bits(&gb, 9); |
||
485 | } else { |
||
486 | ctx->block_pts[ctx->num_blocks] = 0; |
||
487 | } |
||
488 | ctx->num_blocks++; |
||
489 | } |
||
490 | |||
491 | block_pointer = src + table_bytes + 2; |
||
492 | bytes_left = src_size - table_bytes - 2; |
||
493 | ctx->sample_offset = 0; |
||
494 | for (i = 0; i < ctx->num_blocks; i++) { |
||
495 | if (bytes_left < ctx->block_size[i]) { |
||
496 | av_log(avctx, AV_LOG_ERROR, "I'm pedaling backwards\n"); |
||
497 | break; |
||
498 | } |
||
499 | init_get_bits(&gb, block_pointer, ctx->block_size[i] * 8); |
||
500 | if (decode_block(avctx, &gb, samples0 + ctx->sample_offset, |
||
501 | samples1 + ctx->sample_offset) < 0) { |
||
502 | av_log(avctx, AV_LOG_ERROR, "Sir, I got carsick in your office. Not decoding the rest of packet.\n"); |
||
503 | break; |
||
504 | } |
||
505 | block_pointer += ctx->block_size[i]; |
||
506 | bytes_left -= ctx->block_size[i]; |
||
507 | } |
||
508 | |||
509 | frame->nb_samples = ctx->sample_offset; |
||
510 | *got_frame_ptr = ctx->sample_offset > 0; |
||
511 | |||
512 | return avpkt->size; |
||
513 | } |
||
514 | |||
515 | static void decode_flush(AVCodecContext *avctx) |
||
516 | { |
||
517 | RALFContext *ctx = avctx->priv_data; |
||
518 | |||
519 | ctx->has_pkt = 0; |
||
520 | } |
||
521 | |||
522 | |||
523 | AVCodec ff_ralf_decoder = { |
||
524 | .name = "ralf", |
||
525 | .long_name = NULL_IF_CONFIG_SMALL("RealAudio Lossless"), |
||
526 | .type = AVMEDIA_TYPE_AUDIO, |
||
527 | .id = AV_CODEC_ID_RALF, |
||
528 | .priv_data_size = sizeof(RALFContext), |
||
529 | .init = decode_init, |
||
530 | .close = decode_close, |
||
531 | .decode = decode_frame, |
||
532 | .flush = decode_flush, |
||
533 | .capabilities = CODEC_CAP_DR1, |
||
534 | .sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_S16P, |
||
535 | AV_SAMPLE_FMT_NONE }, |
||
536 | };>>>>>>><>>>>>>>>>><>=>>>>><>><>><>><>>>>><>>>><>><>>>>>>>>>>>>><>>>>>>>>>>><>=>>=>>><>>><>>>>>> |