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4349 | Serge | 1 | /* |
2 | * RL2 Format Demuxer |
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3 | * Copyright (c) 2008 Sascha Sommer (saschasommer@freenet.de) |
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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 | /** |
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23 | * RL2 file demuxer |
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24 | * @file |
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25 | * @author Sascha Sommer (saschasommer@freenet.de) |
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26 | * @see http://wiki.multimedia.cx/index.php?title=RL2 |
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27 | * |
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28 | * extradata: |
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29 | * 2 byte le initial drawing offset within 320x200 viewport |
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30 | * 4 byte le number of used colors |
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31 | * 256 * 3 bytes rgb palette |
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32 | * optional background_frame |
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33 | */ |
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34 | |||
35 | #include "libavutil/intreadwrite.h" |
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36 | #include "libavutil/mathematics.h" |
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37 | #include "avformat.h" |
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38 | #include "internal.h" |
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39 | |||
40 | #define EXTRADATA1_SIZE (6 + 256 * 3) ///< video base, clr, palette |
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41 | |||
42 | #define FORM_TAG MKBETAG('F', 'O', 'R', 'M') |
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43 | #define RLV2_TAG MKBETAG('R', 'L', 'V', '2') |
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44 | #define RLV3_TAG MKBETAG('R', 'L', 'V', '3') |
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45 | |||
46 | typedef struct Rl2DemuxContext { |
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47 | unsigned int index_pos[2]; ///< indexes in the sample tables |
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48 | } Rl2DemuxContext; |
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49 | |||
50 | |||
51 | /** |
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52 | * check if the file is in rl2 format |
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53 | * @param p probe buffer |
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54 | * @return 0 when the probe buffer does not contain rl2 data, > 0 otherwise |
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55 | */ |
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56 | static int rl2_probe(AVProbeData *p) |
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57 | { |
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58 | |||
59 | if(AV_RB32(&p->buf[0]) != FORM_TAG) |
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60 | return 0; |
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61 | |||
62 | if(AV_RB32(&p->buf[8]) != RLV2_TAG && |
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63 | AV_RB32(&p->buf[8]) != RLV3_TAG) |
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64 | return 0; |
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65 | |||
66 | return AVPROBE_SCORE_MAX; |
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67 | } |
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68 | |||
69 | /** |
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70 | * read rl2 header data and setup the avstreams |
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71 | * @param s demuxer context |
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72 | * @return 0 on success, AVERROR otherwise |
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73 | */ |
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74 | static av_cold int rl2_read_header(AVFormatContext *s) |
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75 | { |
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76 | AVIOContext *pb = s->pb; |
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77 | AVStream *st; |
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78 | unsigned int frame_count; |
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79 | unsigned int audio_frame_counter = 0; |
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80 | unsigned int video_frame_counter = 0; |
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81 | unsigned int back_size; |
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82 | unsigned short sound_rate; |
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83 | unsigned short rate; |
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84 | unsigned short channels; |
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85 | unsigned short def_sound_size; |
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86 | unsigned int signature; |
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87 | unsigned int pts_den = 11025; /* video only case */ |
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88 | unsigned int pts_num = 1103; |
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89 | unsigned int* chunk_offset = NULL; |
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90 | int* chunk_size = NULL; |
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91 | int* audio_size = NULL; |
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92 | int i; |
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93 | int ret = 0; |
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94 | |||
95 | avio_skip(pb,4); /* skip FORM tag */ |
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96 | back_size = avio_rl32(pb); /**< get size of the background frame */ |
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97 | signature = avio_rb32(pb); |
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98 | avio_skip(pb, 4); /* data size */ |
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99 | frame_count = avio_rl32(pb); |
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100 | |||
101 | /* disallow back_sizes and frame_counts that may lead to overflows later */ |
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102 | if(back_size > INT_MAX/2 || frame_count > INT_MAX / sizeof(uint32_t)) |
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103 | return AVERROR_INVALIDDATA; |
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104 | |||
105 | avio_skip(pb, 2); /* encoding mentod */ |
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106 | sound_rate = avio_rl16(pb); |
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107 | rate = avio_rl16(pb); |
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108 | channels = avio_rl16(pb); |
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109 | def_sound_size = avio_rl16(pb); |
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110 | |||
111 | /** setup video stream */ |
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112 | st = avformat_new_stream(s, NULL); |
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113 | if(!st) |
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114 | return AVERROR(ENOMEM); |
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115 | |||
116 | st->codec->codec_type = AVMEDIA_TYPE_VIDEO; |
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117 | st->codec->codec_id = AV_CODEC_ID_RL2; |
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118 | st->codec->codec_tag = 0; /* no fourcc */ |
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119 | st->codec->width = 320; |
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120 | st->codec->height = 200; |
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121 | |||
122 | /** allocate and fill extradata */ |
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123 | st->codec->extradata_size = EXTRADATA1_SIZE; |
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124 | |||
125 | if(signature == RLV3_TAG && back_size > 0) |
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126 | st->codec->extradata_size += back_size; |
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127 | |||
128 | if(ff_alloc_extradata(st->codec, st->codec->extradata_size)) |
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129 | return AVERROR(ENOMEM); |
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130 | |||
131 | if(avio_read(pb,st->codec->extradata,st->codec->extradata_size) != |
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132 | st->codec->extradata_size) |
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133 | return AVERROR(EIO); |
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134 | |||
135 | /** setup audio stream if present */ |
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136 | if(sound_rate){ |
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137 | if (!channels || channels > 42) { |
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138 | av_log(s, AV_LOG_ERROR, "Invalid number of channels: %d\n", channels); |
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139 | return AVERROR_INVALIDDATA; |
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140 | } |
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141 | |||
142 | pts_num = def_sound_size; |
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143 | pts_den = rate; |
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144 | |||
145 | st = avformat_new_stream(s, NULL); |
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146 | if (!st) |
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147 | return AVERROR(ENOMEM); |
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148 | st->codec->codec_type = AVMEDIA_TYPE_AUDIO; |
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149 | st->codec->codec_id = AV_CODEC_ID_PCM_U8; |
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150 | st->codec->codec_tag = 1; |
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151 | st->codec->channels = channels; |
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152 | st->codec->bits_per_coded_sample = 8; |
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153 | st->codec->sample_rate = rate; |
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154 | st->codec->bit_rate = st->codec->channels * st->codec->sample_rate * |
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155 | st->codec->bits_per_coded_sample; |
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156 | st->codec->block_align = st->codec->channels * |
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157 | st->codec->bits_per_coded_sample / 8; |
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158 | avpriv_set_pts_info(st,32,1,rate); |
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159 | } |
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160 | |||
161 | avpriv_set_pts_info(s->streams[0], 32, pts_num, pts_den); |
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162 | |||
163 | chunk_size = av_malloc(frame_count * sizeof(uint32_t)); |
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164 | audio_size = av_malloc(frame_count * sizeof(uint32_t)); |
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165 | chunk_offset = av_malloc(frame_count * sizeof(uint32_t)); |
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166 | |||
167 | if(!chunk_size || !audio_size || !chunk_offset){ |
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168 | av_free(chunk_size); |
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169 | av_free(audio_size); |
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170 | av_free(chunk_offset); |
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171 | return AVERROR(ENOMEM); |
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172 | } |
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173 | |||
174 | /** read offset and size tables */ |
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175 | for(i=0; i < frame_count;i++) |
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176 | chunk_size[i] = avio_rl32(pb); |
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177 | for(i=0; i < frame_count;i++) |
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178 | chunk_offset[i] = avio_rl32(pb); |
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179 | for(i=0; i < frame_count;i++) |
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180 | audio_size[i] = avio_rl32(pb) & 0xFFFF; |
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181 | |||
182 | /** build the sample index */ |
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183 | for(i=0;i |
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184 | if(chunk_size[i] < 0 || audio_size[i] > chunk_size[i]){ |
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185 | ret = AVERROR_INVALIDDATA; |
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186 | break; |
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187 | } |
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188 | |||
189 | if(sound_rate && audio_size[i]){ |
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190 | av_add_index_entry(s->streams[1], chunk_offset[i], |
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191 | audio_frame_counter,audio_size[i], 0, AVINDEX_KEYFRAME); |
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192 | audio_frame_counter += audio_size[i] / channels; |
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193 | } |
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194 | av_add_index_entry(s->streams[0], chunk_offset[i] + audio_size[i], |
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195 | video_frame_counter,chunk_size[i]-audio_size[i],0,AVINDEX_KEYFRAME); |
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196 | ++video_frame_counter; |
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197 | } |
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198 | |||
199 | |||
200 | av_free(chunk_size); |
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201 | av_free(audio_size); |
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202 | av_free(chunk_offset); |
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203 | |||
204 | return ret; |
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205 | } |
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206 | |||
207 | /** |
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208 | * read a single audio or video packet |
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209 | * @param s demuxer context |
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210 | * @param pkt the packet to be filled |
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211 | * @return 0 on success, AVERROR otherwise |
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212 | */ |
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213 | static int rl2_read_packet(AVFormatContext *s, |
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214 | AVPacket *pkt) |
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215 | { |
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216 | Rl2DemuxContext *rl2 = s->priv_data; |
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217 | AVIOContext *pb = s->pb; |
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218 | AVIndexEntry *sample = NULL; |
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219 | int i; |
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220 | int ret = 0; |
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221 | int stream_id = -1; |
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222 | int64_t pos = INT64_MAX; |
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223 | |||
224 | /** check if there is a valid video or audio entry that can be used */ |
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225 | for(i=0; i |
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226 | if(rl2->index_pos[i] < s->streams[i]->nb_index_entries |
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227 | && s->streams[i]->index_entries[ rl2->index_pos[i] ].pos < pos){ |
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228 | sample = &s->streams[i]->index_entries[ rl2->index_pos[i] ]; |
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229 | pos= sample->pos; |
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230 | stream_id= i; |
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231 | } |
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232 | } |
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233 | |||
234 | if(stream_id == -1) |
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235 | return AVERROR_EOF; |
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236 | |||
237 | ++rl2->index_pos[stream_id]; |
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238 | |||
239 | /** position the stream (will probably be there anyway) */ |
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240 | avio_seek(pb, sample->pos, SEEK_SET); |
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241 | |||
242 | /** fill the packet */ |
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243 | ret = av_get_packet(pb, pkt, sample->size); |
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244 | if(ret != sample->size){ |
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245 | av_free_packet(pkt); |
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246 | return AVERROR(EIO); |
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247 | } |
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248 | |||
249 | pkt->stream_index = stream_id; |
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250 | pkt->pts = sample->timestamp; |
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251 | |||
252 | return ret; |
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253 | } |
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254 | |||
255 | /** |
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256 | * seek to a new timestamp |
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257 | * @param s demuxer context |
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258 | * @param stream_index index of the stream that should be seeked |
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259 | * @param timestamp wanted timestamp |
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260 | * @param flags direction and seeking mode |
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261 | * @return 0 on success, -1 otherwise |
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262 | */ |
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263 | static int rl2_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags) |
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264 | { |
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265 | AVStream *st = s->streams[stream_index]; |
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266 | Rl2DemuxContext *rl2 = s->priv_data; |
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267 | int i; |
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268 | int index = av_index_search_timestamp(st, timestamp, flags); |
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269 | if(index < 0) |
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270 | return -1; |
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271 | |||
272 | rl2->index_pos[stream_index] = index; |
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273 | timestamp = st->index_entries[index].timestamp; |
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274 | |||
275 | for(i=0; i < s->nb_streams; i++){ |
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276 | AVStream *st2 = s->streams[i]; |
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277 | index = av_index_search_timestamp(st2, |
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278 | av_rescale_q(timestamp, st->time_base, st2->time_base), |
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279 | flags | AVSEEK_FLAG_BACKWARD); |
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280 | |||
281 | if(index < 0) |
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282 | index = 0; |
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283 | |||
284 | rl2->index_pos[i] = index; |
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285 | } |
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286 | |||
287 | return 0; |
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288 | } |
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289 | |||
290 | AVInputFormat ff_rl2_demuxer = { |
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291 | .name = "rl2", |
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292 | .long_name = NULL_IF_CONFIG_SMALL("RL2"), |
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293 | .priv_data_size = sizeof(Rl2DemuxContext), |
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294 | .read_probe = rl2_probe, |
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295 | .read_header = rl2_read_header, |
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296 | .read_packet = rl2_read_packet, |
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297 | .read_seek = rl2_read_seek, |
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298 | };>>>>>> |