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Rev | Author | Line No. | Line |
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4349 | Serge | 1 | /* |
2 | * Sony OpenMG (OMA) demuxer |
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3 | * |
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4 | * Copyright (c) 2008, 2013 Maxim Poliakovski |
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5 | * 2008 Benjamin Larsson |
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6 | * 2011 David Goldwich |
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7 | * |
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8 | * This file is part of FFmpeg. |
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9 | * |
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10 | * FFmpeg is free software; you can redistribute it and/or |
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11 | * modify it under the terms of the GNU Lesser General Public |
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12 | * License as published by the Free Software Foundation; either |
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13 | * version 2.1 of the License, or (at your option) any later version. |
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14 | * |
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15 | * FFmpeg is distributed in the hope that it will be useful, |
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16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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18 | * Lesser General Public License for more details. |
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19 | * |
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20 | * You should have received a copy of the GNU Lesser General Public |
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21 | * License along with FFmpeg; if not, write to the Free Software |
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22 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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23 | */ |
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24 | |||
25 | /** |
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26 | * @file |
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27 | * This is a demuxer for Sony OpenMG Music files |
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28 | * |
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29 | * Known file extensions: ".oma", "aa3" |
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30 | * The format of such files consists of three parts: |
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31 | * - "ea3" header carrying overall info and metadata. Except for starting with |
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32 | * "ea" instead of "ID", it's an ID3v2 header. |
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33 | * - "EA3" header is a Sony-specific header containing information about |
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34 | * the OpenMG file: codec type (usually ATRAC, can also be MP3 or WMA), |
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35 | * codec specific info (packet size, sample rate, channels and so on) |
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36 | * and DRM related info (file encryption, content id). |
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37 | * - Sound data organized in packets follow the EA3 header |
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38 | * (can be encrypted using the Sony DRM!). |
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39 | * |
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40 | */ |
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41 | |||
42 | #include "libavutil/channel_layout.h" |
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43 | #include "avformat.h" |
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44 | #include "internal.h" |
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45 | #include "libavutil/intreadwrite.h" |
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46 | #include "libavutil/des.h" |
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47 | #include "oma.h" |
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48 | #include "pcm.h" |
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49 | #include "id3v2.h" |
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50 | |||
51 | |||
52 | static const uint64_t leaf_table[] = { |
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53 | 0xd79e8283acea4620, 0x7a9762f445afd0d8, |
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54 | 0x354d60a60b8c79f1, 0x584e1cde00b07aee, |
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55 | 0x1573cd93da7df623, 0x47f98d79620dd535 |
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56 | }; |
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57 | |||
58 | typedef struct OMAContext { |
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59 | uint64_t content_start; |
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60 | int encrypted; |
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61 | uint16_t k_size; |
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62 | uint16_t e_size; |
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63 | uint16_t i_size; |
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64 | uint16_t s_size; |
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65 | uint32_t rid; |
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66 | uint8_t r_val[24]; |
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67 | uint8_t n_val[24]; |
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68 | uint8_t m_val[8]; |
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69 | uint8_t s_val[8]; |
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70 | uint8_t sm_val[8]; |
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71 | uint8_t e_val[8]; |
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72 | uint8_t iv[8]; |
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73 | struct AVDES av_des; |
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74 | } OMAContext; |
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75 | |||
76 | static void hex_log(AVFormatContext *s, int level, |
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77 | const char *name, const uint8_t *value, int len) |
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78 | { |
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79 | char buf[33]; |
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80 | len = FFMIN(len, 16); |
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81 | if (av_log_get_level() < level) |
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82 | return; |
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83 | ff_data_to_hex(buf, value, len, 1); |
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84 | buf[len << 1] = '\0'; |
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85 | av_log(s, level, "%s: %s\n", name, buf); |
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86 | } |
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87 | |||
88 | static int kset(AVFormatContext *s, const uint8_t *r_val, const uint8_t *n_val, |
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89 | int len) |
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90 | { |
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91 | OMAContext *oc = s->priv_data; |
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92 | |||
93 | if (!r_val && !n_val) |
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94 | return -1; |
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95 | |||
96 | len = FFMIN(len, 16); |
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97 | |||
98 | /* use first 64 bits in the third round again */ |
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99 | if (r_val) { |
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100 | if (r_val != oc->r_val) { |
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101 | memset(oc->r_val, 0, 24); |
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102 | memcpy(oc->r_val, r_val, len); |
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103 | } |
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104 | memcpy(&oc->r_val[16], r_val, 8); |
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105 | } |
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106 | if (n_val) { |
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107 | if (n_val != oc->n_val) { |
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108 | memset(oc->n_val, 0, 24); |
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109 | memcpy(oc->n_val, n_val, len); |
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110 | } |
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111 | memcpy(&oc->n_val[16], n_val, 8); |
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112 | } |
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113 | |||
114 | return 0; |
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115 | } |
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116 | |||
117 | #define OMA_RPROBE_M_VAL 48 + 1 |
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118 | |||
119 | static int rprobe(AVFormatContext *s, uint8_t *enc_header, unsigned size, |
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120 | const uint8_t *r_val) |
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121 | { |
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122 | OMAContext *oc = s->priv_data; |
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123 | unsigned int pos; |
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124 | struct AVDES av_des; |
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125 | |||
126 | if (!enc_header || !r_val || |
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127 | size < OMA_ENC_HEADER_SIZE + oc->k_size + oc->e_size + oc->i_size || |
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128 | size < OMA_RPROBE_M_VAL) |
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129 | return -1; |
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130 | |||
131 | /* m_val */ |
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132 | av_des_init(&av_des, r_val, 192, 1); |
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133 | av_des_crypt(&av_des, oc->m_val, &enc_header[48], 1, NULL, 1); |
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134 | |||
135 | /* s_val */ |
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136 | av_des_init(&av_des, oc->m_val, 64, 0); |
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137 | av_des_crypt(&av_des, oc->s_val, NULL, 1, NULL, 0); |
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138 | |||
139 | /* sm_val */ |
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140 | pos = OMA_ENC_HEADER_SIZE + oc->k_size + oc->e_size; |
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141 | av_des_init(&av_des, oc->s_val, 64, 0); |
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142 | av_des_mac(&av_des, oc->sm_val, &enc_header[pos], (oc->i_size >> 3)); |
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143 | |||
144 | pos += oc->i_size; |
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145 | |||
146 | return memcmp(&enc_header[pos], oc->sm_val, 8) ? -1 : 0; |
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147 | } |
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148 | |||
149 | static int nprobe(AVFormatContext *s, uint8_t *enc_header, unsigned size, |
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150 | const uint8_t *n_val) |
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151 | { |
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152 | OMAContext *oc = s->priv_data; |
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153 | uint64_t pos; |
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154 | uint32_t taglen, datalen; |
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155 | struct AVDES av_des; |
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156 | |||
157 | if (!enc_header || !n_val || |
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158 | size < OMA_ENC_HEADER_SIZE + oc->k_size + 4) |
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159 | return -1; |
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160 | |||
161 | pos = OMA_ENC_HEADER_SIZE + oc->k_size; |
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162 | if (!memcmp(&enc_header[pos], "EKB ", 4)) |
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163 | pos += 32; |
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164 | |||
165 | if (size < pos + 44) |
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166 | return -1; |
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167 | |||
168 | if (AV_RB32(&enc_header[pos]) != oc->rid) |
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169 | av_log(s, AV_LOG_DEBUG, "Mismatching RID\n"); |
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170 | |||
171 | taglen = AV_RB32(&enc_header[pos + 32]); |
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172 | datalen = AV_RB32(&enc_header[pos + 36]) >> 4; |
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173 | |||
174 | pos += 44L + taglen; |
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175 | |||
176 | if (pos + (((uint64_t)datalen) << 4) > size) |
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177 | return -1; |
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178 | |||
179 | av_des_init(&av_des, n_val, 192, 1); |
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180 | while (datalen-- > 0) { |
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181 | av_des_crypt(&av_des, oc->r_val, &enc_header[pos], 2, NULL, 1); |
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182 | kset(s, oc->r_val, NULL, 16); |
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183 | if (!rprobe(s, enc_header, size, oc->r_val)) |
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184 | return 0; |
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185 | pos += 16; |
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186 | } |
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187 | |||
188 | return -1; |
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189 | } |
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190 | |||
191 | static int decrypt_init(AVFormatContext *s, ID3v2ExtraMeta *em, uint8_t *header) |
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192 | { |
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193 | OMAContext *oc = s->priv_data; |
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194 | ID3v2ExtraMetaGEOB *geob = NULL; |
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195 | uint8_t *gdata; |
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196 | |||
197 | oc->encrypted = 1; |
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198 | av_log(s, AV_LOG_INFO, "File is encrypted\n"); |
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199 | |||
200 | /* find GEOB metadata */ |
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201 | while (em) { |
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202 | if (!strcmp(em->tag, "GEOB") && |
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203 | (geob = em->data) && |
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204 | (!strcmp(geob->description, "OMG_LSI") || |
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205 | !strcmp(geob->description, "OMG_BKLSI"))) { |
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206 | break; |
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207 | } |
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208 | em = em->next; |
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209 | } |
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210 | if (!em) { |
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211 | av_log(s, AV_LOG_ERROR, "No encryption header found\n"); |
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212 | return AVERROR_INVALIDDATA; |
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213 | } |
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214 | |||
215 | if (geob->datasize < 64) { |
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216 | av_log(s, AV_LOG_ERROR, |
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217 | "Invalid GEOB data size: %u\n", geob->datasize); |
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218 | return AVERROR_INVALIDDATA; |
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219 | } |
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220 | |||
221 | gdata = geob->data; |
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222 | |||
223 | if (AV_RB16(gdata) != 1) |
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224 | av_log(s, AV_LOG_WARNING, "Unknown version in encryption header\n"); |
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225 | |||
226 | oc->k_size = AV_RB16(&gdata[2]); |
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227 | oc->e_size = AV_RB16(&gdata[4]); |
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228 | oc->i_size = AV_RB16(&gdata[6]); |
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229 | oc->s_size = AV_RB16(&gdata[8]); |
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230 | |||
231 | if (memcmp(&gdata[OMA_ENC_HEADER_SIZE], "KEYRING ", 12)) { |
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232 | av_log(s, AV_LOG_ERROR, "Invalid encryption header\n"); |
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233 | return AVERROR_INVALIDDATA; |
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234 | } |
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235 | if ( OMA_ENC_HEADER_SIZE + oc->k_size + oc->e_size + oc->i_size + 8 > geob->datasize |
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236 | || OMA_ENC_HEADER_SIZE + 48 > geob->datasize |
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237 | ) { |
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238 | av_log(s, AV_LOG_ERROR, "Too little GEOB data\n"); |
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239 | return AVERROR_INVALIDDATA; |
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240 | } |
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241 | oc->rid = AV_RB32(&gdata[OMA_ENC_HEADER_SIZE + 28]); |
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242 | av_log(s, AV_LOG_DEBUG, "RID: %.8x\n", oc->rid); |
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243 | |||
244 | memcpy(oc->iv, &header[0x58], 8); |
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245 | hex_log(s, AV_LOG_DEBUG, "IV", oc->iv, 8); |
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246 | |||
247 | hex_log(s, AV_LOG_DEBUG, "CBC-MAC", |
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248 | &gdata[OMA_ENC_HEADER_SIZE + oc->k_size + oc->e_size + oc->i_size], |
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249 | 8); |
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250 | |||
251 | if (s->keylen > 0) { |
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252 | kset(s, s->key, s->key, s->keylen); |
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253 | } |
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254 | if (!memcmp(oc->r_val, (const uint8_t[8]){0}, 8) || |
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255 | rprobe(s, gdata, geob->datasize, oc->r_val) < 0 && |
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256 | nprobe(s, gdata, geob->datasize, oc->n_val) < 0) { |
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257 | int i; |
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258 | for (i = 0; i < FF_ARRAY_ELEMS(leaf_table); i += 2) { |
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259 | uint8_t buf[16]; |
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260 | AV_WL64(buf, leaf_table[i]); |
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261 | AV_WL64(&buf[8], leaf_table[i + 1]); |
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262 | kset(s, buf, buf, 16); |
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263 | if (!rprobe(s, gdata, geob->datasize, oc->r_val) || |
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264 | !nprobe(s, gdata, geob->datasize, oc->n_val)) |
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265 | break; |
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266 | } |
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267 | if (i >= FF_ARRAY_ELEMS(leaf_table)) { |
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268 | av_log(s, AV_LOG_ERROR, "Invalid key\n"); |
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269 | return AVERROR_INVALIDDATA; |
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270 | } |
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271 | } |
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272 | |||
273 | /* e_val */ |
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274 | av_des_init(&oc->av_des, oc->m_val, 64, 0); |
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275 | av_des_crypt(&oc->av_des, oc->e_val, |
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276 | &gdata[OMA_ENC_HEADER_SIZE + 40], 1, NULL, 0); |
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277 | hex_log(s, AV_LOG_DEBUG, "EK", oc->e_val, 8); |
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278 | |||
279 | /* init e_val */ |
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280 | av_des_init(&oc->av_des, oc->e_val, 64, 1); |
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281 | |||
282 | return 0; |
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283 | } |
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284 | |||
285 | static int oma_read_header(AVFormatContext *s) |
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286 | { |
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287 | int ret, framesize, jsflag, samplerate; |
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288 | uint32_t codec_params, channel_id; |
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289 | int16_t eid; |
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290 | uint8_t buf[EA3_HEADER_SIZE]; |
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291 | uint8_t *edata; |
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292 | AVStream *st; |
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293 | ID3v2ExtraMeta *extra_meta = NULL; |
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294 | OMAContext *oc = s->priv_data; |
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295 | |||
296 | ff_id3v2_read(s, ID3v2_EA3_MAGIC, &extra_meta); |
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297 | ret = avio_read(s->pb, buf, EA3_HEADER_SIZE); |
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298 | if (ret < EA3_HEADER_SIZE) |
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299 | return -1; |
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300 | |||
301 | if (memcmp(buf, ((const uint8_t[]){'E', 'A', '3'}), 3) || |
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302 | buf[4] != 0 || buf[5] != EA3_HEADER_SIZE) { |
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303 | av_log(s, AV_LOG_ERROR, "Couldn't find the EA3 header !\n"); |
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304 | return AVERROR_INVALIDDATA; |
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305 | } |
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306 | |||
307 | oc->content_start = avio_tell(s->pb); |
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308 | |||
309 | /* encrypted file */ |
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310 | eid = AV_RB16(&buf[6]); |
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311 | if (eid != -1 && eid != -128 && decrypt_init(s, extra_meta, buf) < 0) { |
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312 | ff_id3v2_free_extra_meta(&extra_meta); |
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313 | return -1; |
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314 | } |
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315 | |||
316 | ff_id3v2_free_extra_meta(&extra_meta); |
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317 | |||
318 | codec_params = AV_RB24(&buf[33]); |
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319 | |||
320 | st = avformat_new_stream(s, NULL); |
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321 | if (!st) |
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322 | return AVERROR(ENOMEM); |
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323 | |||
324 | st->start_time = 0; |
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325 | st->codec->codec_type = AVMEDIA_TYPE_AUDIO; |
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326 | st->codec->codec_tag = buf[32]; |
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327 | st->codec->codec_id = ff_codec_get_id(ff_oma_codec_tags, |
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328 | st->codec->codec_tag); |
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329 | |||
330 | switch (buf[32]) { |
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331 | case OMA_CODECID_ATRAC3: |
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332 | samplerate = ff_oma_srate_tab[(codec_params >> 13) & 7] * 100; |
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333 | if (!samplerate) { |
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334 | av_log(s, AV_LOG_ERROR, "Unsupported sample rate\n"); |
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335 | return AVERROR_INVALIDDATA; |
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336 | } |
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337 | if (samplerate != 44100) |
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338 | avpriv_request_sample(s, "Sample rate %d", samplerate); |
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339 | |||
340 | framesize = (codec_params & 0x3FF) * 8; |
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341 | |||
342 | /* get stereo coding mode, 1 for joint-stereo */ |
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343 | jsflag = (codec_params >> 17) & 1; |
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344 | |||
345 | st->codec->channels = 2; |
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346 | st->codec->channel_layout = AV_CH_LAYOUT_STEREO; |
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347 | st->codec->sample_rate = samplerate; |
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348 | st->codec->bit_rate = st->codec->sample_rate * framesize * 8 / 1024; |
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349 | |||
350 | /* fake the ATRAC3 extradata |
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351 | * (wav format, makes stream copy to wav work) */ |
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352 | if (ff_alloc_extradata(st->codec, 14)) |
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353 | return AVERROR(ENOMEM); |
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354 | |||
355 | edata = st->codec->extradata; |
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356 | AV_WL16(&edata[0], 1); // always 1 |
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357 | AV_WL32(&edata[2], samplerate); // samples rate |
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358 | AV_WL16(&edata[6], jsflag); // coding mode |
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359 | AV_WL16(&edata[8], jsflag); // coding mode |
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360 | AV_WL16(&edata[10], 1); // always 1 |
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361 | // AV_WL16(&edata[12], 0); // always 0 |
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362 | |||
363 | avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate); |
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364 | break; |
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365 | case OMA_CODECID_ATRAC3P: |
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366 | channel_id = (codec_params >> 10) & 7; |
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367 | if (!channel_id) { |
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368 | av_log(s, AV_LOG_ERROR, |
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369 | "Invalid ATRAC-X channel id: %d\n", channel_id); |
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370 | return AVERROR_INVALIDDATA; |
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371 | } |
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372 | st->codec->channel_layout = ff_oma_chid_to_native_layout[channel_id - 1]; |
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373 | st->codec->channels = ff_oma_chid_to_num_channels[channel_id - 1]; |
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374 | framesize = ((codec_params & 0x3FF) * 8) + 8; |
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375 | samplerate = ff_oma_srate_tab[(codec_params >> 13) & 7] * 100; |
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376 | if (!samplerate) { |
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377 | av_log(s, AV_LOG_ERROR, "Unsupported sample rate\n"); |
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378 | return AVERROR_INVALIDDATA; |
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379 | } |
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380 | st->codec->sample_rate = samplerate; |
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381 | st->codec->bit_rate = samplerate * framesize * 8 / 2048; |
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382 | avpriv_set_pts_info(st, 64, 1, samplerate); |
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383 | av_log(s, AV_LOG_ERROR, "Unsupported codec ATRAC3+!\n"); |
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384 | break; |
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385 | case OMA_CODECID_MP3: |
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386 | st->need_parsing = AVSTREAM_PARSE_FULL_RAW; |
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387 | framesize = 1024; |
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388 | break; |
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389 | case OMA_CODECID_LPCM: |
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390 | /* PCM 44.1 kHz 16 bit stereo big-endian */ |
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391 | st->codec->channels = 2; |
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392 | st->codec->channel_layout = AV_CH_LAYOUT_STEREO; |
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393 | st->codec->sample_rate = 44100; |
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394 | framesize = 1024; |
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395 | /* bit rate = sample rate x PCM block align (= 4) x 8 */ |
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396 | st->codec->bit_rate = st->codec->sample_rate * 32; |
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397 | st->codec->bits_per_coded_sample = |
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398 | av_get_bits_per_sample(st->codec->codec_id); |
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399 | avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate); |
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400 | break; |
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401 | default: |
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402 | av_log(s, AV_LOG_ERROR, "Unsupported codec %d!\n", buf[32]); |
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403 | return AVERROR(ENOSYS); |
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404 | } |
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405 | |||
406 | st->codec->block_align = framesize; |
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407 | |||
408 | return 0; |
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409 | } |
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410 | |||
411 | |||
412 | static int oma_read_packet(AVFormatContext *s, AVPacket *pkt) |
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413 | { |
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414 | OMAContext *oc = s->priv_data; |
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415 | int packet_size = s->streams[0]->codec->block_align; |
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416 | int ret = av_get_packet(s->pb, pkt, packet_size); |
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417 | |||
418 | if (ret < packet_size) |
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419 | pkt->flags |= AV_PKT_FLAG_CORRUPT; |
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420 | |||
421 | if (ret < 0) |
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422 | return ret; |
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423 | if (!ret) |
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424 | return AVERROR_EOF; |
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425 | |||
426 | pkt->stream_index = 0; |
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427 | |||
428 | if (oc->encrypted) { |
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429 | /* previous unencrypted block saved in IV for |
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430 | * the next packet (CBC mode) */ |
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431 | if (ret == packet_size) |
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432 | av_des_crypt(&oc->av_des, pkt->data, pkt->data, |
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433 | (packet_size >> 3), oc->iv, 1); |
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434 | else |
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435 | memset(oc->iv, 0, 8); |
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436 | } |
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437 | |||
438 | return ret; |
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439 | } |
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440 | |||
441 | static int oma_read_probe(AVProbeData *p) |
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442 | { |
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443 | const uint8_t *buf; |
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444 | unsigned tag_len = 0; |
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445 | |||
446 | buf = p->buf; |
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447 | |||
448 | if (p->buf_size < ID3v2_HEADER_SIZE || |
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449 | !ff_id3v2_match(buf, ID3v2_EA3_MAGIC) || |
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450 | buf[3] != 3 || // version must be 3 |
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451 | buf[4]) // flags byte zero |
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452 | return 0; |
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453 | |||
454 | tag_len = ff_id3v2_tag_len(buf); |
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455 | |||
456 | /* This check cannot overflow as tag_len has at most 28 bits */ |
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457 | if (p->buf_size < tag_len + 5) |
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458 | /* EA3 header comes late, might be outside of the probe buffer */ |
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459 | return AVPROBE_SCORE_EXTENSION; |
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460 | |||
461 | buf += tag_len; |
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462 | |||
463 | if (!memcmp(buf, "EA3", 3) && !buf[4] && buf[5] == EA3_HEADER_SIZE) |
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464 | return AVPROBE_SCORE_MAX; |
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465 | else |
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466 | return 0; |
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467 | } |
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468 | |||
469 | static int oma_read_seek(struct AVFormatContext *s, |
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470 | int stream_index, int64_t timestamp, int flags) |
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471 | { |
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472 | OMAContext *oc = s->priv_data; |
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473 | int err = ff_pcm_read_seek(s, stream_index, timestamp, flags); |
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474 | |||
475 | if (!oc->encrypted) |
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476 | return err; |
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477 | |||
478 | /* readjust IV for CBC */ |
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479 | if (err || avio_tell(s->pb) < oc->content_start) |
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480 | goto wipe; |
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481 | if ((err = avio_seek(s->pb, -8, SEEK_CUR)) < 0) |
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482 | goto wipe; |
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483 | if ((err = avio_read(s->pb, oc->iv, 8)) < 8) { |
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484 | if (err >= 0) |
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485 | err = AVERROR_EOF; |
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486 | goto wipe; |
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487 | } |
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488 | |||
489 | return 0; |
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490 | wipe: |
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491 | memset(oc->iv, 0, 8); |
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492 | return err; |
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493 | } |
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494 | |||
495 | AVInputFormat ff_oma_demuxer = { |
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496 | .name = "oma", |
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497 | .long_name = NULL_IF_CONFIG_SMALL("Sony OpenMG audio"), |
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498 | .priv_data_size = sizeof(OMAContext), |
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499 | .read_probe = oma_read_probe, |
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500 | .read_header = oma_read_header, |
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501 | .read_packet = oma_read_packet, |
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502 | .read_seek = oma_read_seek, |
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503 | .flags = AVFMT_GENERIC_INDEX, |
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504 | .extensions = "oma,omg,aa3", |
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505 | .codec_tag = (const AVCodecTag* const []){ff_oma_codec_tags, 0}, |
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506 | };>>>>>>>>>>>>>><>>>>>><>> |