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6148 | serge | 1 | /* |
2 | * TTA demuxer |
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3 | * Copyright (c) 2006 Alex Beregszaszi |
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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 "libavcodec/get_bits.h" |
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23 | #include "apetag.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 "id3v1.h" |
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28 | #include "libavutil/crc.h" |
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29 | #include "libavutil/dict.h" |
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30 | |||
31 | typedef struct { |
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32 | int totalframes, currentframe; |
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33 | int frame_size; |
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34 | int last_frame_size; |
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35 | } TTAContext; |
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36 | |||
37 | static unsigned long tta_check_crc(unsigned long checksum, const uint8_t *buf, |
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38 | unsigned int len) |
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39 | { |
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40 | return av_crc(av_crc_get_table(AV_CRC_32_IEEE_LE), checksum, buf, len); |
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41 | } |
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42 | |||
43 | static int tta_probe(AVProbeData *p) |
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44 | { |
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45 | if (AV_RL32(&p->buf[0]) == MKTAG('T', 'T', 'A', '1') && |
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46 | (AV_RL16(&p->buf[4]) == 1 || AV_RL16(&p->buf[4]) == 2) && |
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47 | AV_RL16(&p->buf[6]) > 0 && |
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48 | AV_RL16(&p->buf[8]) > 0 && |
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49 | AV_RL32(&p->buf[10]) > 0) |
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50 | return AVPROBE_SCORE_EXTENSION + 30; |
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51 | return 0; |
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52 | } |
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53 | |||
54 | static int tta_read_header(AVFormatContext *s) |
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55 | { |
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56 | TTAContext *c = s->priv_data; |
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57 | AVStream *st; |
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58 | int i, channels, bps, samplerate; |
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59 | uint64_t framepos, start_offset; |
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60 | uint32_t nb_samples, crc; |
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61 | |||
62 | ff_id3v1_read(s); |
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63 | |||
64 | start_offset = avio_tell(s->pb); |
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65 | ffio_init_checksum(s->pb, tta_check_crc, UINT32_MAX); |
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66 | if (avio_rl32(s->pb) != AV_RL32("TTA1")) |
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67 | return AVERROR_INVALIDDATA; |
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68 | |||
69 | avio_skip(s->pb, 2); // FIXME: flags |
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70 | channels = avio_rl16(s->pb); |
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71 | bps = avio_rl16(s->pb); |
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72 | samplerate = avio_rl32(s->pb); |
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73 | if(samplerate <= 0 || samplerate > 1000000){ |
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74 | av_log(s, AV_LOG_ERROR, "nonsense samplerate\n"); |
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75 | return AVERROR_INVALIDDATA; |
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76 | } |
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77 | |||
78 | nb_samples = avio_rl32(s->pb); |
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79 | if (!nb_samples) { |
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80 | av_log(s, AV_LOG_ERROR, "invalid number of samples\n"); |
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81 | return AVERROR_INVALIDDATA; |
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82 | } |
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83 | |||
84 | crc = ffio_get_checksum(s->pb) ^ UINT32_MAX; |
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85 | if (crc != avio_rl32(s->pb)) { |
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86 | av_log(s, AV_LOG_ERROR, "Header CRC error\n"); |
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87 | return AVERROR_INVALIDDATA; |
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88 | } |
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89 | |||
90 | c->frame_size = samplerate * 256 / 245; |
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91 | c->last_frame_size = nb_samples % c->frame_size; |
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92 | if (!c->last_frame_size) |
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93 | c->last_frame_size = c->frame_size; |
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94 | c->totalframes = nb_samples / c->frame_size + (c->last_frame_size < c->frame_size); |
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95 | c->currentframe = 0; |
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96 | |||
97 | if(c->totalframes >= UINT_MAX/sizeof(uint32_t) || c->totalframes <= 0){ |
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98 | av_log(s, AV_LOG_ERROR, "totalframes %d invalid\n", c->totalframes); |
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99 | return AVERROR_INVALIDDATA; |
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100 | } |
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101 | |||
102 | st = avformat_new_stream(s, NULL); |
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103 | if (!st) |
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104 | return AVERROR(ENOMEM); |
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105 | |||
106 | avpriv_set_pts_info(st, 64, 1, samplerate); |
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107 | st->start_time = 0; |
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108 | st->duration = nb_samples; |
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109 | |||
110 | framepos = avio_tell(s->pb) + 4*c->totalframes + 4; |
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111 | |||
112 | if (ff_alloc_extradata(st->codec, avio_tell(s->pb) - start_offset)) |
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113 | return AVERROR(ENOMEM); |
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114 | |||
115 | avio_seek(s->pb, start_offset, SEEK_SET); |
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116 | avio_read(s->pb, st->codec->extradata, st->codec->extradata_size); |
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117 | |||
118 | ffio_init_checksum(s->pb, tta_check_crc, UINT32_MAX); |
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119 | for (i = 0; i < c->totalframes; i++) { |
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120 | uint32_t size = avio_rl32(s->pb); |
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121 | av_add_index_entry(st, framepos, i * c->frame_size, size, 0, |
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122 | AVINDEX_KEYFRAME); |
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123 | framepos += size; |
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124 | } |
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125 | crc = ffio_get_checksum(s->pb) ^ UINT32_MAX; |
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126 | if (crc != avio_rl32(s->pb)) { |
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127 | av_log(s, AV_LOG_ERROR, "Seek table CRC error\n"); |
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128 | return AVERROR_INVALIDDATA; |
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129 | } |
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130 | |||
131 | st->codec->codec_type = AVMEDIA_TYPE_AUDIO; |
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132 | st->codec->codec_id = AV_CODEC_ID_TTA; |
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133 | st->codec->channels = channels; |
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134 | st->codec->sample_rate = samplerate; |
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135 | st->codec->bits_per_coded_sample = bps; |
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136 | |||
137 | if (s->pb->seekable) { |
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138 | int64_t pos = avio_tell(s->pb); |
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139 | ff_ape_parse_tag(s); |
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140 | avio_seek(s->pb, pos, SEEK_SET); |
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141 | } |
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142 | |||
143 | return 0; |
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144 | } |
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145 | |||
146 | static int tta_read_packet(AVFormatContext *s, AVPacket *pkt) |
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147 | { |
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148 | TTAContext *c = s->priv_data; |
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149 | AVStream *st = s->streams[0]; |
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150 | int size, ret; |
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151 | |||
152 | // FIXME! |
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153 | if (c->currentframe >= c->totalframes) |
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154 | return AVERROR_EOF; |
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155 | |||
156 | size = st->index_entries[c->currentframe].size; |
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157 | |||
158 | ret = av_get_packet(s->pb, pkt, size); |
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159 | pkt->dts = st->index_entries[c->currentframe++].timestamp; |
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160 | pkt->duration = c->currentframe == c->totalframes ? c->last_frame_size : |
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161 | c->frame_size; |
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162 | return ret; |
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163 | } |
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164 | |||
165 | static int tta_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags) |
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166 | { |
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167 | TTAContext *c = s->priv_data; |
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168 | AVStream *st = s->streams[stream_index]; |
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169 | int index = av_index_search_timestamp(st, timestamp, flags); |
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170 | if (index < 0) |
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171 | return -1; |
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172 | if (avio_seek(s->pb, st->index_entries[index].pos, SEEK_SET) < 0) |
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173 | return -1; |
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174 | |||
175 | c->currentframe = index; |
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176 | |||
177 | return 0; |
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178 | } |
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179 | |||
180 | AVInputFormat ff_tta_demuxer = { |
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181 | .name = "tta", |
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182 | .long_name = NULL_IF_CONFIG_SMALL("TTA (True Audio)"), |
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183 | .priv_data_size = sizeof(TTAContext), |
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184 | .read_probe = tta_probe, |
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185 | .read_header = tta_read_header, |
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186 | .read_packet = tta_read_packet, |
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187 | .read_seek = tta_read_seek, |
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188 | .extensions = "tta", |
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189 | };>>>=>>=> |