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4349 | Serge | 1 | /* |
2 | * AU muxer and demuxer |
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3 | * Copyright (c) 2001 Fabrice Bellard |
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4 | * |
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5 | * first version by Francois Revol |
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6 | * |
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7 | * This file is part of FFmpeg. |
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8 | * |
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9 | * FFmpeg is free software; you can redistribute it and/or |
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10 | * modify it under the terms of the GNU Lesser General Public |
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11 | * License as published by the Free Software Foundation; either |
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12 | * version 2.1 of the License, or (at your option) any later version. |
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13 | * |
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14 | * FFmpeg is distributed in the hope that it will be useful, |
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15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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17 | * Lesser General Public License for more details. |
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18 | * |
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19 | * You should have received a copy of the GNU Lesser General Public |
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20 | * License along with FFmpeg; if not, write to the Free Software |
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21 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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22 | */ |
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23 | |||
24 | /* |
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25 | * Reference documents: |
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26 | * http://www.opengroup.org/public/pubs/external/auformat.html |
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27 | * http://www.goice.co.jp/member/mo/formats/au.html |
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28 | */ |
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29 | |||
30 | #include "avformat.h" |
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31 | #include "internal.h" |
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32 | #include "avio_internal.h" |
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33 | #include "pcm.h" |
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34 | #include "libavutil/avassert.h" |
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35 | |||
36 | /* if we don't know the size in advance */ |
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37 | #define AU_UNKNOWN_SIZE ((uint32_t)(~0)) |
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38 | /* the specification requires an annotation field of at least eight bytes */ |
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39 | #define AU_HEADER_SIZE (24+8) |
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40 | |||
41 | static const AVCodecTag codec_au_tags[] = { |
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42 | { AV_CODEC_ID_PCM_MULAW, 1 }, |
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43 | { AV_CODEC_ID_PCM_S8, 2 }, |
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44 | { AV_CODEC_ID_PCM_S16BE, 3 }, |
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45 | { AV_CODEC_ID_PCM_S24BE, 4 }, |
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46 | { AV_CODEC_ID_PCM_S32BE, 5 }, |
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47 | { AV_CODEC_ID_PCM_F32BE, 6 }, |
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48 | { AV_CODEC_ID_PCM_F64BE, 7 }, |
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49 | { AV_CODEC_ID_ADPCM_G726LE, 23 }, |
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50 | { AV_CODEC_ID_ADPCM_G722,24 }, |
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51 | { AV_CODEC_ID_ADPCM_G726LE, 25 }, |
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52 | { AV_CODEC_ID_ADPCM_G726LE, 26 }, |
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53 | { AV_CODEC_ID_PCM_ALAW, 27 }, |
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54 | { AV_CODEC_ID_ADPCM_G726LE, MKBETAG('7','2','6','2') }, |
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55 | { AV_CODEC_ID_NONE, 0 }, |
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56 | }; |
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57 | |||
58 | #if CONFIG_AU_DEMUXER |
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59 | |||
60 | static int au_probe(AVProbeData *p) |
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61 | { |
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62 | if (p->buf[0] == '.' && p->buf[1] == 's' && |
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63 | p->buf[2] == 'n' && p->buf[3] == 'd') |
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64 | return AVPROBE_SCORE_MAX; |
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65 | else |
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66 | return 0; |
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67 | } |
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68 | |||
69 | #define BLOCK_SIZE 1024 |
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70 | |||
71 | static int au_read_header(AVFormatContext *s) |
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72 | { |
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73 | int size, data_size = 0; |
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74 | unsigned int tag; |
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75 | AVIOContext *pb = s->pb; |
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76 | unsigned int id, channels, rate; |
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77 | int bps; |
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78 | enum AVCodecID codec; |
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79 | AVStream *st; |
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80 | |||
81 | tag = avio_rl32(pb); |
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82 | if (tag != MKTAG('.', 's', 'n', 'd')) |
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83 | return AVERROR_INVALIDDATA; |
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84 | size = avio_rb32(pb); /* header size */ |
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85 | data_size = avio_rb32(pb); /* data size in bytes */ |
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86 | |||
87 | if (data_size < 0 && data_size != AU_UNKNOWN_SIZE) { |
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88 | av_log(s, AV_LOG_ERROR, "Invalid negative data size '%d' found\n", data_size); |
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89 | return AVERROR_INVALIDDATA; |
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90 | } |
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91 | |||
92 | id = avio_rb32(pb); |
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93 | rate = avio_rb32(pb); |
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94 | channels = avio_rb32(pb); |
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95 | |||
96 | if (size > 24) { |
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97 | /* skip unused data */ |
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98 | avio_skip(pb, size - 24); |
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99 | } |
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100 | |||
101 | codec = ff_codec_get_id(codec_au_tags, id); |
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102 | |||
103 | if (codec == AV_CODEC_ID_NONE) { |
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104 | avpriv_request_sample(s, "unknown or unsupported codec tag: %u", id); |
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105 | return AVERROR_PATCHWELCOME; |
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106 | } |
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107 | |||
108 | bps = av_get_bits_per_sample(codec); |
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109 | if (codec == AV_CODEC_ID_ADPCM_G726LE) { |
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110 | if (id == MKBETAG('7','2','6','2')) { |
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111 | bps = 2; |
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112 | } else { |
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113 | const uint8_t bpcss[] = {4, 0, 3, 5}; |
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114 | av_assert0(id >= 23 && id < 23 + 4); |
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115 | bps = bpcss[id - 23]; |
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116 | } |
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117 | } else if (!bps) { |
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118 | avpriv_request_sample(s, "Unknown bits per sample"); |
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119 | return AVERROR_PATCHWELCOME; |
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120 | } |
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121 | |||
122 | if (channels == 0 || channels >= INT_MAX / (BLOCK_SIZE * bps >> 3)) { |
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123 | av_log(s, AV_LOG_ERROR, "Invalid number of channels %u\n", channels); |
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124 | return AVERROR_INVALIDDATA; |
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125 | } |
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126 | |||
127 | if (rate == 0 || rate > INT_MAX) { |
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128 | av_log(s, AV_LOG_ERROR, "Invalid sample rate: %u\n", rate); |
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129 | return AVERROR_INVALIDDATA; |
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130 | } |
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131 | |||
132 | st = avformat_new_stream(s, NULL); |
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133 | if (!st) |
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134 | return AVERROR(ENOMEM); |
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135 | st->codec->codec_type = AVMEDIA_TYPE_AUDIO; |
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136 | st->codec->codec_tag = id; |
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137 | st->codec->codec_id = codec; |
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138 | st->codec->channels = channels; |
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139 | st->codec->sample_rate = rate; |
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140 | st->codec->bits_per_coded_sample = bps; |
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141 | st->codec->bit_rate = channels * rate * bps; |
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142 | st->codec->block_align = FFMAX(bps * st->codec->channels / 8, 1); |
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143 | if (data_size != AU_UNKNOWN_SIZE) |
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144 | st->duration = (((int64_t)data_size)<<3) / (st->codec->channels * (int64_t)bps); |
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145 | |||
146 | st->start_time = 0; |
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147 | avpriv_set_pts_info(st, 64, 1, rate); |
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148 | |||
149 | return 0; |
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150 | } |
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151 | |||
152 | AVInputFormat ff_au_demuxer = { |
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153 | .name = "au", |
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154 | .long_name = NULL_IF_CONFIG_SMALL("Sun AU"), |
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155 | .read_probe = au_probe, |
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156 | .read_header = au_read_header, |
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157 | .read_packet = ff_pcm_read_packet, |
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158 | .read_seek = ff_pcm_read_seek, |
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159 | .codec_tag = (const AVCodecTag* const []) { codec_au_tags, 0 }, |
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160 | }; |
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161 | |||
162 | #endif /* CONFIG_AU_DEMUXER */ |
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163 | |||
164 | #if CONFIG_AU_MUXER |
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165 | |||
166 | #include "rawenc.h" |
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167 | |||
168 | static int au_write_header(AVFormatContext *s) |
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169 | { |
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170 | AVIOContext *pb = s->pb; |
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171 | AVCodecContext *enc = s->streams[0]->codec; |
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172 | |||
173 | if (s->nb_streams != 1) { |
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174 | av_log(s, AV_LOG_ERROR, "only one stream is supported\n"); |
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175 | return AVERROR(EINVAL); |
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176 | } |
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177 | |||
178 | enc->codec_tag = ff_codec_get_tag(codec_au_tags, enc->codec_id); |
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179 | if (!enc->codec_tag) { |
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180 | av_log(s, AV_LOG_ERROR, "unsupported codec\n"); |
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181 | return AVERROR(EINVAL); |
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182 | } |
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183 | |||
184 | ffio_wfourcc(pb, ".snd"); /* magic number */ |
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185 | avio_wb32(pb, AU_HEADER_SIZE); /* header size */ |
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186 | avio_wb32(pb, AU_UNKNOWN_SIZE); /* data size */ |
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187 | avio_wb32(pb, enc->codec_tag); /* codec ID */ |
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188 | avio_wb32(pb, enc->sample_rate); |
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189 | avio_wb32(pb, enc->channels); |
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190 | avio_wb64(pb, 0); /* annotation field */ |
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191 | avio_flush(pb); |
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192 | |||
193 | return 0; |
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194 | } |
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195 | |||
196 | static int au_write_trailer(AVFormatContext *s) |
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197 | { |
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198 | AVIOContext *pb = s->pb; |
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199 | int64_t file_size = avio_tell(pb); |
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200 | |||
201 | if (s->pb->seekable && file_size < INT32_MAX) { |
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202 | /* update file size */ |
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203 | avio_seek(pb, 8, SEEK_SET); |
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204 | avio_wb32(pb, (uint32_t)(file_size - AU_HEADER_SIZE)); |
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205 | avio_seek(pb, file_size, SEEK_SET); |
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206 | avio_flush(pb); |
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207 | } |
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208 | |||
209 | return 0; |
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210 | } |
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211 | |||
212 | AVOutputFormat ff_au_muxer = { |
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213 | .name = "au", |
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214 | .long_name = NULL_IF_CONFIG_SMALL("Sun AU"), |
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215 | .mime_type = "audio/basic", |
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216 | .extensions = "au", |
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217 | .audio_codec = AV_CODEC_ID_PCM_S16BE, |
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218 | .video_codec = AV_CODEC_ID_NONE, |
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219 | .write_header = au_write_header, |
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220 | .write_packet = ff_raw_write_packet, |
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221 | .write_trailer = au_write_trailer, |
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222 | .codec_tag = (const AVCodecTag* const []) { codec_au_tags, 0 }, |
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223 | }; |
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224 | |||
225 | #endif /* CONFIG_AU_MUXER */>3)><3)>>> |