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Rev | Author | Line No. | Line |
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6147 | serge | 1 | /* |
2 | * Musepack demuxer |
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3 | * Copyright (c) 2006 Konstantin Shishkov |
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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/channel_layout.h" |
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23 | #include "libavcodec/get_bits.h" |
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24 | #include "avformat.h" |
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25 | #include "internal.h" |
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26 | #include "apetag.h" |
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27 | #include "id3v1.h" |
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28 | #include "libavutil/dict.h" |
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29 | |||
30 | #define MPC_FRAMESIZE 1152 |
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31 | #define DELAY_FRAMES 32 |
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32 | |||
33 | static const int mpc_rate[4] = { 44100, 48000, 37800, 32000 }; |
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34 | typedef struct MPCFrame { |
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35 | int64_t pos; |
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36 | int size, skip; |
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37 | }MPCFrame; |
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38 | |||
39 | typedef struct MPCContext { |
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40 | int ver; |
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41 | uint32_t curframe, lastframe; |
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42 | uint32_t fcount; |
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43 | MPCFrame *frames; |
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44 | int curbits; |
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45 | int frames_noted; |
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46 | } MPCContext; |
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47 | |||
48 | static int mpc_probe(AVProbeData *p) |
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49 | { |
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50 | const uint8_t *d = p->buf; |
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51 | if (d[0] == 'M' && d[1] == 'P' && d[2] == '+' && (d[3] == 0x17 || d[3] == 0x7)) |
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52 | return AVPROBE_SCORE_MAX; |
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53 | return 0; |
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54 | } |
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55 | |||
56 | static int mpc_read_header(AVFormatContext *s) |
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57 | { |
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58 | MPCContext *c = s->priv_data; |
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59 | AVStream *st; |
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60 | |||
61 | if(avio_rl24(s->pb) != MKTAG('M', 'P', '+', 0)){ |
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62 | av_log(s, AV_LOG_ERROR, "Not a Musepack file\n"); |
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63 | return AVERROR_INVALIDDATA; |
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64 | } |
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65 | c->ver = avio_r8(s->pb); |
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66 | if(c->ver != 0x07 && c->ver != 0x17){ |
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67 | av_log(s, AV_LOG_ERROR, "Can demux Musepack SV7, got version %02X\n", c->ver); |
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68 | return AVERROR_INVALIDDATA; |
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69 | } |
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70 | c->fcount = avio_rl32(s->pb); |
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71 | if((int64_t)c->fcount * sizeof(MPCFrame) >= UINT_MAX){ |
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72 | av_log(s, AV_LOG_ERROR, "Too many frames, seeking is not possible\n"); |
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73 | return AVERROR_INVALIDDATA; |
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74 | } |
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75 | if(c->fcount){ |
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76 | c->frames = av_malloc(c->fcount * sizeof(MPCFrame)); |
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77 | if(!c->frames){ |
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78 | av_log(s, AV_LOG_ERROR, "Cannot allocate seektable\n"); |
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79 | return AVERROR(ENOMEM); |
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80 | } |
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81 | }else{ |
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82 | av_log(s, AV_LOG_WARNING, "Container reports no frames\n"); |
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83 | } |
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84 | c->curframe = 0; |
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85 | c->lastframe = -1; |
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86 | c->curbits = 8; |
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87 | c->frames_noted = 0; |
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88 | |||
89 | st = avformat_new_stream(s, NULL); |
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90 | if (!st) |
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91 | return AVERROR(ENOMEM); |
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92 | st->codec->codec_type = AVMEDIA_TYPE_AUDIO; |
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93 | st->codec->codec_id = AV_CODEC_ID_MUSEPACK7; |
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94 | st->codec->channels = 2; |
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95 | st->codec->channel_layout = AV_CH_LAYOUT_STEREO; |
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96 | st->codec->bits_per_coded_sample = 16; |
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97 | |||
98 | if (ff_get_extradata(st->codec, s->pb, 16) < 0) |
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99 | return AVERROR(ENOMEM); |
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100 | st->codec->sample_rate = mpc_rate[st->codec->extradata[2] & 3]; |
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101 | avpriv_set_pts_info(st, 32, MPC_FRAMESIZE, st->codec->sample_rate); |
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102 | /* scan for seekpoints */ |
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103 | st->start_time = 0; |
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104 | st->duration = c->fcount; |
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105 | |||
106 | /* try to read APE tags */ |
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107 | if (s->pb->seekable) { |
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108 | int64_t pos = avio_tell(s->pb); |
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109 | ff_ape_parse_tag(s); |
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110 | if (!av_dict_get(s->metadata, "", NULL, AV_DICT_IGNORE_SUFFIX)) |
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111 | ff_id3v1_read(s); |
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112 | avio_seek(s->pb, pos, SEEK_SET); |
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113 | } |
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114 | |||
115 | return 0; |
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116 | } |
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117 | |||
118 | static int mpc_read_packet(AVFormatContext *s, AVPacket *pkt) |
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119 | { |
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120 | MPCContext *c = s->priv_data; |
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121 | int ret, size, size2, curbits, cur = c->curframe; |
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122 | unsigned tmp; |
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123 | int64_t pos; |
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124 | |||
125 | if (c->curframe >= c->fcount && c->fcount) |
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126 | return AVERROR_EOF; |
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127 | |||
128 | if(c->curframe != c->lastframe + 1){ |
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129 | avio_seek(s->pb, c->frames[c->curframe].pos, SEEK_SET); |
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130 | c->curbits = c->frames[c->curframe].skip; |
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131 | } |
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132 | c->lastframe = c->curframe; |
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133 | c->curframe++; |
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134 | curbits = c->curbits; |
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135 | pos = avio_tell(s->pb); |
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136 | tmp = avio_rl32(s->pb); |
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137 | if(curbits <= 12){ |
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138 | size2 = (tmp >> (12 - curbits)) & 0xFFFFF; |
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139 | }else{ |
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140 | size2 = (tmp << (curbits - 12) | avio_rl32(s->pb) >> (44 - curbits)) & 0xFFFFF; |
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141 | } |
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142 | curbits += 20; |
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143 | avio_seek(s->pb, pos, SEEK_SET); |
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144 | |||
145 | size = ((size2 + curbits + 31) & ~31) >> 3; |
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146 | if(cur == c->frames_noted && c->fcount){ |
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147 | c->frames[cur].pos = pos; |
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148 | c->frames[cur].size = size; |
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149 | c->frames[cur].skip = curbits - 20; |
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150 | av_add_index_entry(s->streams[0], cur, cur, size, 0, AVINDEX_KEYFRAME); |
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151 | c->frames_noted++; |
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152 | } |
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153 | c->curbits = (curbits + size2) & 0x1F; |
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154 | |||
155 | if ((ret = av_new_packet(pkt, size + 4)) < 0) |
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156 | return ret; |
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157 | |||
158 | pkt->data[0] = curbits; |
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159 | pkt->data[1] = (c->curframe > c->fcount) && c->fcount; |
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160 | pkt->data[2] = 0; |
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161 | pkt->data[3] = 0; |
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162 | |||
163 | pkt->stream_index = 0; |
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164 | pkt->pts = cur; |
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165 | ret = avio_read(s->pb, pkt->data + 4, size); |
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166 | if(c->curbits) |
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167 | avio_seek(s->pb, -4, SEEK_CUR); |
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168 | if(ret < size){ |
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169 | av_free_packet(pkt); |
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170 | return ret < 0 ? ret : AVERROR(EIO); |
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171 | } |
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172 | pkt->size = ret + 4; |
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173 | |||
174 | return 0; |
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175 | } |
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176 | |||
177 | static int mpc_read_close(AVFormatContext *s) |
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178 | { |
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179 | MPCContext *c = s->priv_data; |
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180 | |||
181 | av_freep(&c->frames); |
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182 | return 0; |
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183 | } |
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184 | |||
185 | /** |
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186 | * Seek to the given position |
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187 | * If position is unknown but is within the limits of file |
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188 | * then packets are skipped unless desired position is reached |
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189 | * |
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190 | * Also this function makes use of the fact that timestamp == frameno |
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191 | */ |
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192 | static int mpc_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags) |
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193 | { |
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194 | AVStream *st = s->streams[stream_index]; |
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195 | MPCContext *c = s->priv_data; |
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196 | AVPacket pkt1, *pkt = &pkt1; |
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197 | int ret; |
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198 | int index = av_index_search_timestamp(st, FFMAX(timestamp - DELAY_FRAMES, 0), flags); |
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199 | uint32_t lastframe; |
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200 | |||
201 | /* if found, seek there */ |
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202 | if (index >= 0 && st->index_entries[st->nb_index_entries-1].timestamp >= timestamp - DELAY_FRAMES){ |
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203 | c->curframe = st->index_entries[index].pos; |
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204 | return 0; |
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205 | } |
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206 | /* if timestamp is out of bounds, return error */ |
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207 | if(timestamp < 0 || timestamp >= c->fcount) |
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208 | return -1; |
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209 | timestamp -= DELAY_FRAMES; |
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210 | /* seek to the furthest known position and read packets until |
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211 | we reach desired position */ |
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212 | lastframe = c->curframe; |
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213 | if(c->frames_noted) c->curframe = c->frames_noted - 1; |
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214 | while(c->curframe < timestamp){ |
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215 | ret = av_read_frame(s, pkt); |
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216 | if (ret < 0){ |
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217 | c->curframe = lastframe; |
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218 | return ret; |
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219 | } |
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220 | av_free_packet(pkt); |
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221 | } |
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222 | return 0; |
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223 | } |
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224 | |||
225 | |||
226 | AVInputFormat ff_mpc_demuxer = { |
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227 | .name = "mpc", |
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228 | .long_name = NULL_IF_CONFIG_SMALL("Musepack"), |
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229 | .priv_data_size = sizeof(MPCContext), |
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230 | .read_probe = mpc_probe, |
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231 | .read_header = mpc_read_header, |
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232 | .read_packet = mpc_read_packet, |
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233 | .read_close = mpc_read_close, |
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234 | .read_seek = mpc_read_seek, |
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235 | .extensions = "mpc", |
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236 | };>>>>>>><>=>> |