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Rev | Author | Line No. | Line |
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6147 | serge | 1 | /* |
2 | * Raw TAK demuxer |
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3 | * Copyright (c) 2012 Paul B Mahol |
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4 | * |
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5 | * This file is part of FFmpeg. |
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6 | * |
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7 | * FFmpeg is free software; you can redistribute it and/or |
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8 | * modify it under the terms of the GNU Lesser General Public |
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9 | * License as published by the Free Software Foundation; either |
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10 | * version 2.1 of the License, or (at your option) any later version. |
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11 | * |
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12 | * FFmpeg is distributed in the hope that it will be useful, |
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13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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15 | * Lesser General Public License for more details. |
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16 | * |
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17 | * You should have received a copy of the GNU Lesser General Public |
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18 | * License along with FFmpeg; if not, write to the Free Software |
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19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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20 | */ |
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21 | |||
22 | #include "libavutil/crc.h" |
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23 | #include "libavcodec/tak.h" |
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24 | #include "avformat.h" |
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25 | #include "avio_internal.h" |
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26 | #include "internal.h" |
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27 | #include "rawdec.h" |
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28 | #include "apetag.h" |
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29 | |||
30 | typedef struct TAKDemuxContext { |
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31 | int mlast_frame; |
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32 | int64_t data_end; |
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33 | } TAKDemuxContext; |
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34 | |||
35 | static int tak_probe(AVProbeData *p) |
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36 | { |
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37 | if (!memcmp(p->buf, "tBaK", 4)) |
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38 | return AVPROBE_SCORE_EXTENSION; |
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39 | return 0; |
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40 | } |
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41 | |||
42 | static unsigned long tak_check_crc(unsigned long checksum, const uint8_t *buf, |
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43 | unsigned int len) |
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44 | { |
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45 | return av_crc(av_crc_get_table(AV_CRC_24_IEEE), checksum, buf, len); |
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46 | } |
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47 | |||
48 | static int tak_read_header(AVFormatContext *s) |
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49 | { |
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50 | TAKDemuxContext *tc = s->priv_data; |
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51 | AVIOContext *pb = s->pb; |
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52 | GetBitContext gb; |
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53 | AVStream *st; |
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54 | uint8_t *buffer = NULL; |
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55 | int ret; |
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56 | |||
57 | st = avformat_new_stream(s, 0); |
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58 | if (!st) |
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59 | return AVERROR(ENOMEM); |
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60 | |||
61 | st->codec->codec_type = AVMEDIA_TYPE_AUDIO; |
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62 | st->codec->codec_id = AV_CODEC_ID_TAK; |
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63 | st->need_parsing = AVSTREAM_PARSE_FULL_RAW; |
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64 | |||
65 | tc->mlast_frame = 0; |
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66 | if (avio_rl32(pb) != MKTAG('t', 'B', 'a', 'K')) { |
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67 | avio_seek(pb, -4, SEEK_CUR); |
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68 | return 0; |
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69 | } |
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70 | |||
71 | while (!avio_feof(pb)) { |
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72 | enum TAKMetaDataType type; |
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73 | int size; |
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74 | |||
75 | type = avio_r8(pb) & 0x7f; |
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76 | size = avio_rl24(pb); |
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77 | |||
78 | switch (type) { |
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79 | case TAK_METADATA_STREAMINFO: |
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80 | case TAK_METADATA_LAST_FRAME: |
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81 | case TAK_METADATA_ENCODER: |
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82 | if (size <= 3) |
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83 | return AVERROR_INVALIDDATA; |
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84 | |||
85 | buffer = av_malloc(size - 3 + AV_INPUT_BUFFER_PADDING_SIZE); |
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86 | if (!buffer) |
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87 | return AVERROR(ENOMEM); |
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88 | memset(buffer + size - 3, 0, AV_INPUT_BUFFER_PADDING_SIZE); |
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89 | |||
90 | ffio_init_checksum(pb, tak_check_crc, 0xCE04B7U); |
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91 | if (avio_read(pb, buffer, size - 3) != size - 3) { |
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92 | av_freep(&buffer); |
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93 | return AVERROR(EIO); |
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94 | } |
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95 | if (ffio_get_checksum(s->pb) != avio_rb24(pb)) { |
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96 | av_log(s, AV_LOG_ERROR, "%d metadata block CRC error.\n", type); |
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97 | if (s->error_recognition & AV_EF_EXPLODE) { |
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98 | av_freep(&buffer); |
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99 | return AVERROR_INVALIDDATA; |
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100 | } |
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101 | } |
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102 | |||
103 | init_get_bits8(&gb, buffer, size - 3); |
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104 | break; |
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105 | case TAK_METADATA_MD5: { |
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106 | uint8_t md5[16]; |
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107 | int i; |
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108 | |||
109 | if (size != 19) |
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110 | return AVERROR_INVALIDDATA; |
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111 | ffio_init_checksum(pb, tak_check_crc, 0xCE04B7U); |
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112 | avio_read(pb, md5, 16); |
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113 | if (ffio_get_checksum(s->pb) != avio_rb24(pb)) { |
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114 | av_log(s, AV_LOG_ERROR, "MD5 metadata block CRC error.\n"); |
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115 | if (s->error_recognition & AV_EF_EXPLODE) |
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116 | return AVERROR_INVALIDDATA; |
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117 | } |
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118 | |||
119 | av_log(s, AV_LOG_VERBOSE, "MD5="); |
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120 | for (i = 0; i < 16; i++) |
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121 | av_log(s, AV_LOG_VERBOSE, "%02x", md5[i]); |
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122 | av_log(s, AV_LOG_VERBOSE, "\n"); |
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123 | break; |
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124 | } |
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125 | case TAK_METADATA_END: { |
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126 | int64_t curpos = avio_tell(pb); |
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127 | |||
128 | if (pb->seekable) { |
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129 | ff_ape_parse_tag(s); |
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130 | avio_seek(pb, curpos, SEEK_SET); |
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131 | } |
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132 | |||
133 | tc->data_end += curpos; |
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134 | return 0; |
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135 | } |
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136 | default: |
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137 | ret = avio_skip(pb, size); |
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138 | if (ret < 0) |
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139 | return ret; |
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140 | } |
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141 | |||
142 | if (type == TAK_METADATA_STREAMINFO) { |
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143 | TAKStreamInfo ti; |
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144 | |||
145 | avpriv_tak_parse_streaminfo(&gb, &ti); |
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146 | if (ti.samples > 0) |
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147 | st->duration = ti.samples; |
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148 | st->codec->bits_per_coded_sample = ti.bps; |
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149 | if (ti.ch_layout) |
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150 | st->codec->channel_layout = ti.ch_layout; |
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151 | st->codec->sample_rate = ti.sample_rate; |
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152 | st->codec->channels = ti.channels; |
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153 | st->start_time = 0; |
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154 | avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate); |
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155 | st->codec->extradata = buffer; |
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156 | st->codec->extradata_size = size - 3; |
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157 | buffer = NULL; |
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158 | } else if (type == TAK_METADATA_LAST_FRAME) { |
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159 | if (size != 11) |
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160 | return AVERROR_INVALIDDATA; |
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161 | tc->mlast_frame = 1; |
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162 | tc->data_end = get_bits64(&gb, TAK_LAST_FRAME_POS_BITS) + |
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163 | get_bits(&gb, TAK_LAST_FRAME_SIZE_BITS); |
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164 | av_freep(&buffer); |
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165 | } else if (type == TAK_METADATA_ENCODER) { |
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166 | av_log(s, AV_LOG_VERBOSE, "encoder version: %0X\n", |
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167 | get_bits_long(&gb, TAK_ENCODER_VERSION_BITS)); |
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168 | av_freep(&buffer); |
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169 | } |
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170 | } |
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171 | |||
172 | return AVERROR_EOF; |
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173 | } |
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174 | |||
175 | static int raw_read_packet(AVFormatContext *s, AVPacket *pkt) |
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176 | { |
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177 | TAKDemuxContext *tc = s->priv_data; |
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178 | int ret; |
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179 | |||
180 | if (tc->mlast_frame) { |
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181 | AVIOContext *pb = s->pb; |
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182 | int64_t size, left; |
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183 | |||
184 | left = tc->data_end - avio_tell(pb); |
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185 | size = FFMIN(left, 1024); |
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186 | if (size <= 0) |
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187 | return AVERROR_EOF; |
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188 | |||
189 | ret = av_get_packet(pb, pkt, size); |
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190 | if (ret < 0) |
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191 | return ret; |
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192 | |||
193 | pkt->stream_index = 0; |
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194 | } else { |
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195 | ret = ff_raw_read_partial_packet(s, pkt); |
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196 | } |
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197 | |||
198 | return ret; |
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199 | } |
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200 | |||
201 | AVInputFormat ff_tak_demuxer = { |
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202 | .name = "tak", |
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203 | .long_name = NULL_IF_CONFIG_SMALL("raw TAK"), |
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204 | .priv_data_size = sizeof(TAKDemuxContext), |
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205 | .read_probe = tak_probe, |
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206 | .read_header = tak_read_header, |
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207 | .read_packet = raw_read_packet, |
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208 | .flags = AVFMT_GENERIC_INDEX, |
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209 | .extensions = "tak", |
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210 | .raw_codec_id = AV_CODEC_ID_TAK, |
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211 | };>=>>>=> |