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4349 | Serge | 1 | /* |
2 | * THP Demuxer |
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3 | * Copyright (c) 2007 Marco Gerards |
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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/intreadwrite.h" |
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23 | #include "libavutil/intfloat.h" |
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24 | #include "avformat.h" |
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25 | #include "internal.h" |
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26 | |||
27 | typedef struct ThpDemuxContext { |
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28 | int version; |
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29 | unsigned first_frame; |
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30 | unsigned first_framesz; |
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31 | unsigned last_frame; |
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32 | int compoff; |
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33 | unsigned framecnt; |
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34 | AVRational fps; |
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35 | unsigned frame; |
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36 | int64_t next_frame; |
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37 | unsigned next_framesz; |
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38 | int video_stream_index; |
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39 | int audio_stream_index; |
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40 | int compcount; |
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41 | unsigned char components[16]; |
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42 | AVStream* vst; |
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43 | int has_audio; |
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44 | unsigned audiosize; |
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45 | } ThpDemuxContext; |
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46 | |||
47 | |||
48 | static int thp_probe(AVProbeData *p) |
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49 | { |
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50 | /* check file header */ |
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51 | if (AV_RL32(p->buf) == MKTAG('T', 'H', 'P', '\0')) |
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52 | return AVPROBE_SCORE_MAX; |
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53 | else |
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54 | return 0; |
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55 | } |
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56 | |||
57 | static int thp_read_header(AVFormatContext *s) |
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58 | { |
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59 | ThpDemuxContext *thp = s->priv_data; |
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60 | AVStream *st; |
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61 | AVIOContext *pb = s->pb; |
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62 | int64_t fsize= avio_size(pb); |
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63 | int i; |
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64 | |||
65 | /* Read the file header. */ |
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66 | avio_rb32(pb); /* Skip Magic. */ |
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67 | thp->version = avio_rb32(pb); |
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68 | |||
69 | avio_rb32(pb); /* Max buf size. */ |
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70 | avio_rb32(pb); /* Max samples. */ |
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71 | |||
72 | thp->fps = av_d2q(av_int2float(avio_rb32(pb)), INT_MAX); |
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73 | thp->framecnt = avio_rb32(pb); |
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74 | thp->first_framesz = avio_rb32(pb); |
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75 | pb->maxsize = avio_rb32(pb); |
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76 | if(fsize>0 && (!pb->maxsize || fsize < pb->maxsize)) |
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77 | pb->maxsize= fsize; |
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78 | |||
79 | thp->compoff = avio_rb32(pb); |
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80 | avio_rb32(pb); /* offsetDataOffset. */ |
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81 | thp->first_frame = avio_rb32(pb); |
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82 | thp->last_frame = avio_rb32(pb); |
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83 | |||
84 | thp->next_framesz = thp->first_framesz; |
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85 | thp->next_frame = thp->first_frame; |
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86 | |||
87 | /* Read the component structure. */ |
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88 | avio_seek (pb, thp->compoff, SEEK_SET); |
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89 | thp->compcount = avio_rb32(pb); |
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90 | |||
91 | /* Read the list of component types. */ |
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92 | avio_read(pb, thp->components, 16); |
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93 | |||
94 | for (i = 0; i < thp->compcount; i++) { |
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95 | if (thp->components[i] == 0) { |
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96 | if (thp->vst != 0) |
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97 | break; |
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98 | |||
99 | /* Video component. */ |
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100 | st = avformat_new_stream(s, NULL); |
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101 | if (!st) |
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102 | return AVERROR(ENOMEM); |
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103 | |||
104 | /* The denominator and numerator are switched because 1/fps |
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105 | is required. */ |
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106 | avpriv_set_pts_info(st, 64, thp->fps.den, thp->fps.num); |
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107 | st->codec->codec_type = AVMEDIA_TYPE_VIDEO; |
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108 | st->codec->codec_id = AV_CODEC_ID_THP; |
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109 | st->codec->codec_tag = 0; /* no fourcc */ |
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110 | st->codec->width = avio_rb32(pb); |
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111 | st->codec->height = avio_rb32(pb); |
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112 | st->codec->sample_rate = av_q2d(thp->fps); |
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113 | st->nb_frames = |
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114 | st->duration = thp->framecnt; |
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115 | thp->vst = st; |
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116 | thp->video_stream_index = st->index; |
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117 | |||
118 | if (thp->version == 0x11000) |
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119 | avio_rb32(pb); /* Unknown. */ |
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120 | } else if (thp->components[i] == 1) { |
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121 | if (thp->has_audio != 0) |
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122 | break; |
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123 | |||
124 | /* Audio component. */ |
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125 | st = avformat_new_stream(s, NULL); |
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126 | if (!st) |
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127 | return AVERROR(ENOMEM); |
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128 | |||
129 | st->codec->codec_type = AVMEDIA_TYPE_AUDIO; |
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130 | st->codec->codec_id = AV_CODEC_ID_ADPCM_THP; |
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131 | st->codec->codec_tag = 0; /* no fourcc */ |
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132 | st->codec->channels = avio_rb32(pb); /* numChannels. */ |
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133 | st->codec->sample_rate = avio_rb32(pb); /* Frequency. */ |
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134 | |||
135 | avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate); |
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136 | |||
137 | thp->audio_stream_index = st->index; |
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138 | thp->has_audio = 1; |
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139 | } |
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140 | } |
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141 | |||
142 | return 0; |
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143 | } |
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144 | |||
145 | static int thp_read_packet(AVFormatContext *s, |
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146 | AVPacket *pkt) |
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147 | { |
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148 | ThpDemuxContext *thp = s->priv_data; |
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149 | AVIOContext *pb = s->pb; |
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150 | unsigned int size; |
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151 | int ret; |
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152 | |||
153 | if (thp->audiosize == 0) { |
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154 | /* Terminate when last frame is reached. */ |
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155 | if (thp->frame >= thp->framecnt) |
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156 | return AVERROR_EOF; |
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157 | |||
158 | avio_seek(pb, thp->next_frame, SEEK_SET); |
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159 | |||
160 | /* Locate the next frame and read out its size. */ |
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161 | thp->next_frame += FFMAX(thp->next_framesz, 1); |
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162 | thp->next_framesz = avio_rb32(pb); |
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163 | |||
164 | avio_rb32(pb); /* Previous total size. */ |
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165 | size = avio_rb32(pb); /* Total size of this frame. */ |
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166 | |||
167 | /* Store the audiosize so the next time this function is called, |
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168 | the audio can be read. */ |
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169 | if (thp->has_audio) |
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170 | thp->audiosize = avio_rb32(pb); /* Audio size. */ |
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171 | else |
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172 | thp->frame++; |
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173 | |||
174 | ret = av_get_packet(pb, pkt, size); |
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175 | if (ret != size) { |
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176 | av_free_packet(pkt); |
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177 | return AVERROR(EIO); |
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178 | } |
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179 | |||
180 | pkt->stream_index = thp->video_stream_index; |
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181 | } else { |
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182 | ret = av_get_packet(pb, pkt, thp->audiosize); |
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183 | if (ret != thp->audiosize) { |
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184 | av_free_packet(pkt); |
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185 | return AVERROR(EIO); |
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186 | } |
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187 | |||
188 | pkt->stream_index = thp->audio_stream_index; |
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189 | if (thp->audiosize >= 8) |
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190 | pkt->duration = AV_RB32(&pkt->data[4]); |
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191 | |||
192 | thp->audiosize = 0; |
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193 | thp->frame++; |
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194 | } |
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195 | |||
196 | return 0; |
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197 | } |
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198 | |||
199 | AVInputFormat ff_thp_demuxer = { |
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200 | .name = "thp", |
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201 | .long_name = NULL_IF_CONFIG_SMALL("THP"), |
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202 | .priv_data_size = sizeof(ThpDemuxContext), |
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203 | .read_probe = thp_probe, |
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204 | .read_header = thp_read_header, |
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205 | .read_packet = thp_read_packet |
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206 | };>> |