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6148 | serge | 1 | /* |
2 | * FLI/FLC Animation File Demuxer |
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3 | * Copyright (c) 2003 The ffmpeg Project |
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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 | * @file |
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24 | * FLI/FLC file demuxer |
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25 | * by Mike Melanson (melanson@pcisys.net) |
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26 | * for more information on the .fli/.flc file format and all of its many |
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27 | * variations, visit: |
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28 | * http://www.compuphase.com/flic.htm |
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29 | * |
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30 | * This demuxer handles standard 0xAF11- and 0xAF12-type FLIs. It also handles |
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31 | * special FLIs from the PC games "Magic Carpet" and "X-COM: Terror from the Deep". |
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32 | */ |
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33 | |||
34 | #include "libavutil/channel_layout.h" |
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35 | #include "libavutil/intreadwrite.h" |
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36 | #include "avformat.h" |
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37 | #include "internal.h" |
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38 | |||
39 | #define FLIC_FILE_MAGIC_1 0xAF11 |
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40 | #define FLIC_FILE_MAGIC_2 0xAF12 |
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41 | #define FLIC_FILE_MAGIC_3 0xAF44 /* Flic Type for Extended FLX Format which |
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42 | originated in Dave's Targa Animator (DTA) */ |
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43 | #define FLIC_CHUNK_MAGIC_1 0xF1FA |
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44 | #define FLIC_CHUNK_MAGIC_2 0xF5FA |
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45 | #define FLIC_MC_SPEED 5 /* speed for Magic Carpet game FLIs */ |
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46 | #define FLIC_DEFAULT_SPEED 5 /* for FLIs that have 0 speed */ |
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47 | #define FLIC_TFTD_CHUNK_AUDIO 0xAAAA /* Audio chunk. Used in Terror from the Deep. |
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48 | Has 10 B extra header not accounted for in the chunk header */ |
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49 | #define FLIC_TFTD_SAMPLE_RATE 22050 |
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50 | |||
51 | #define FLIC_HEADER_SIZE 128 |
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52 | #define FLIC_PREAMBLE_SIZE 6 |
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53 | |||
54 | typedef struct FlicDemuxContext { |
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55 | int video_stream_index; |
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56 | int audio_stream_index; |
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57 | int frame_number; |
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58 | } FlicDemuxContext; |
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59 | |||
60 | static int flic_probe(AVProbeData *p) |
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61 | { |
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62 | int magic_number; |
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63 | |||
64 | if(p->buf_size < FLIC_HEADER_SIZE) |
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65 | return 0; |
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66 | |||
67 | magic_number = AV_RL16(&p->buf[4]); |
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68 | if ((magic_number != FLIC_FILE_MAGIC_1) && |
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69 | (magic_number != FLIC_FILE_MAGIC_2) && |
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70 | (magic_number != FLIC_FILE_MAGIC_3)) |
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71 | return 0; |
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72 | |||
73 | if(AV_RL16(&p->buf[0x10]) != FLIC_CHUNK_MAGIC_1){ |
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74 | if(AV_RL32(&p->buf[0x10]) > 2000) |
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75 | return 0; |
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76 | } |
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77 | |||
78 | if( AV_RL16(&p->buf[0x08]) > 4096 |
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79 | || AV_RL16(&p->buf[0x0A]) > 4096) |
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80 | return 0; |
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81 | |||
82 | |||
83 | return AVPROBE_SCORE_MAX - 1; |
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84 | } |
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85 | |||
86 | static int flic_read_header(AVFormatContext *s) |
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87 | { |
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88 | FlicDemuxContext *flic = s->priv_data; |
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89 | AVIOContext *pb = s->pb; |
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90 | unsigned char header[FLIC_HEADER_SIZE]; |
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91 | AVStream *st, *ast; |
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92 | int speed; |
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93 | int magic_number; |
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94 | unsigned char preamble[FLIC_PREAMBLE_SIZE]; |
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95 | |||
96 | flic->frame_number = 0; |
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97 | |||
98 | /* load the whole header and pull out the width and height */ |
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99 | if (avio_read(pb, header, FLIC_HEADER_SIZE) != FLIC_HEADER_SIZE) |
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100 | return AVERROR(EIO); |
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101 | |||
102 | magic_number = AV_RL16(&header[4]); |
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103 | speed = AV_RL32(&header[0x10]); |
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104 | if (speed == 0) |
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105 | speed = FLIC_DEFAULT_SPEED; |
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106 | |||
107 | /* initialize the decoder streams */ |
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108 | st = avformat_new_stream(s, NULL); |
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109 | if (!st) |
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110 | return AVERROR(ENOMEM); |
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111 | flic->video_stream_index = st->index; |
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112 | st->codec->codec_type = AVMEDIA_TYPE_VIDEO; |
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113 | st->codec->codec_id = AV_CODEC_ID_FLIC; |
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114 | st->codec->codec_tag = 0; /* no fourcc */ |
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115 | st->codec->width = AV_RL16(&header[0x08]); |
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116 | st->codec->height = AV_RL16(&header[0x0A]); |
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117 | |||
118 | if (!st->codec->width || !st->codec->height) { |
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119 | /* Ugly hack needed for the following sample: */ |
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120 | /* http://samples.mplayerhq.hu/fli-flc/fli-bugs/specular.flc */ |
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121 | av_log(s, AV_LOG_WARNING, |
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122 | "File with no specified width/height. Trying 640x480.\n"); |
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123 | st->codec->width = 640; |
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124 | st->codec->height = 480; |
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125 | } |
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126 | |||
127 | /* send over the whole 128-byte FLIC header */ |
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128 | if (ff_alloc_extradata(st->codec, FLIC_HEADER_SIZE)) |
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129 | return AVERROR(ENOMEM); |
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130 | memcpy(st->codec->extradata, header, FLIC_HEADER_SIZE); |
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131 | |||
132 | /* peek at the preamble to detect TFTD videos - they seem to always start with an audio chunk */ |
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133 | if (avio_read(pb, preamble, FLIC_PREAMBLE_SIZE) != FLIC_PREAMBLE_SIZE) { |
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134 | av_log(s, AV_LOG_ERROR, "Failed to peek at preamble\n"); |
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135 | return AVERROR(EIO); |
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136 | } |
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137 | |||
138 | avio_seek(pb, -FLIC_PREAMBLE_SIZE, SEEK_CUR); |
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139 | |||
140 | /* Time to figure out the framerate: |
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141 | * If the first preamble's magic number is 0xAAAA then this file is from |
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142 | * X-COM: Terror from the Deep. If on the other hand there is a FLIC chunk |
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143 | * magic number at offset 0x10 assume this file is from Magic Carpet instead. |
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144 | * If neither of the above is true then this is a normal FLIC file. |
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145 | */ |
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146 | if (AV_RL16(&preamble[4]) == FLIC_TFTD_CHUNK_AUDIO) { |
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147 | /* TFTD videos have an extra 22050 Hz 8-bit mono audio stream */ |
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148 | ast = avformat_new_stream(s, NULL); |
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149 | if (!ast) |
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150 | return AVERROR(ENOMEM); |
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151 | |||
152 | flic->audio_stream_index = ast->index; |
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153 | |||
154 | /* all audio frames are the same size, so use the size of the first chunk for block_align */ |
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155 | ast->codec->block_align = AV_RL32(&preamble[0]); |
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156 | ast->codec->codec_type = AVMEDIA_TYPE_AUDIO; |
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157 | ast->codec->codec_id = AV_CODEC_ID_PCM_U8; |
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158 | ast->codec->codec_tag = 0; |
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159 | ast->codec->sample_rate = FLIC_TFTD_SAMPLE_RATE; |
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160 | ast->codec->channels = 1; |
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161 | ast->codec->bit_rate = st->codec->sample_rate * 8; |
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162 | ast->codec->bits_per_coded_sample = 8; |
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163 | ast->codec->channel_layout = AV_CH_LAYOUT_MONO; |
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164 | ast->codec->extradata_size = 0; |
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165 | |||
166 | /* Since the header information is incorrect we have to figure out the |
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167 | * framerate using block_align and the fact that the audio is 22050 Hz. |
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168 | * We usually have two cases: 2205 -> 10 fps and 1470 -> 15 fps */ |
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169 | avpriv_set_pts_info(st, 64, ast->codec->block_align, FLIC_TFTD_SAMPLE_RATE); |
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170 | avpriv_set_pts_info(ast, 64, 1, FLIC_TFTD_SAMPLE_RATE); |
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171 | } else if (AV_RL16(&header[0x10]) == FLIC_CHUNK_MAGIC_1) { |
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172 | avpriv_set_pts_info(st, 64, FLIC_MC_SPEED, 70); |
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173 | |||
174 | /* rewind the stream since the first chunk is at offset 12 */ |
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175 | avio_seek(pb, 12, SEEK_SET); |
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176 | |||
177 | /* send over abbreviated FLIC header chunk */ |
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178 | av_free(st->codec->extradata); |
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179 | if (ff_alloc_extradata(st->codec, 12)) |
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180 | return AVERROR(ENOMEM); |
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181 | memcpy(st->codec->extradata, header, 12); |
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182 | |||
183 | } else if (magic_number == FLIC_FILE_MAGIC_1) { |
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184 | avpriv_set_pts_info(st, 64, speed, 70); |
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185 | } else if ((magic_number == FLIC_FILE_MAGIC_2) || |
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186 | (magic_number == FLIC_FILE_MAGIC_3)) { |
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187 | avpriv_set_pts_info(st, 64, speed, 1000); |
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188 | } else { |
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189 | av_log(s, AV_LOG_ERROR, "Invalid or unsupported magic chunk in file\n"); |
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190 | return AVERROR_INVALIDDATA; |
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191 | } |
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192 | |||
193 | return 0; |
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194 | } |
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195 | |||
196 | static int flic_read_packet(AVFormatContext *s, |
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197 | AVPacket *pkt) |
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198 | { |
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199 | FlicDemuxContext *flic = s->priv_data; |
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200 | AVIOContext *pb = s->pb; |
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201 | int packet_read = 0; |
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202 | unsigned int size; |
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203 | int magic; |
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204 | int ret = 0; |
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205 | unsigned char preamble[FLIC_PREAMBLE_SIZE]; |
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206 | |||
207 | while (!packet_read) { |
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208 | |||
209 | if ((ret = avio_read(pb, preamble, FLIC_PREAMBLE_SIZE)) != |
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210 | FLIC_PREAMBLE_SIZE) { |
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211 | ret = AVERROR(EIO); |
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212 | break; |
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213 | } |
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214 | |||
215 | size = AV_RL32(&preamble[0]); |
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216 | magic = AV_RL16(&preamble[4]); |
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217 | |||
218 | if (((magic == FLIC_CHUNK_MAGIC_1) || (magic == FLIC_CHUNK_MAGIC_2)) && size > FLIC_PREAMBLE_SIZE) { |
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219 | if (av_new_packet(pkt, size)) { |
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220 | ret = AVERROR(EIO); |
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221 | break; |
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222 | } |
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223 | pkt->stream_index = flic->video_stream_index; |
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224 | pkt->pts = flic->frame_number++; |
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225 | pkt->pos = avio_tell(pb); |
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226 | memcpy(pkt->data, preamble, FLIC_PREAMBLE_SIZE); |
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227 | ret = avio_read(pb, pkt->data + FLIC_PREAMBLE_SIZE, |
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228 | size - FLIC_PREAMBLE_SIZE); |
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229 | if (ret != size - FLIC_PREAMBLE_SIZE) { |
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230 | av_free_packet(pkt); |
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231 | ret = AVERROR(EIO); |
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232 | } |
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233 | packet_read = 1; |
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234 | } else if (magic == FLIC_TFTD_CHUNK_AUDIO) { |
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235 | if (av_new_packet(pkt, size)) { |
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236 | ret = AVERROR(EIO); |
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237 | break; |
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238 | } |
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239 | |||
240 | /* skip useless 10B sub-header (yes, it's not accounted for in the chunk header) */ |
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241 | avio_skip(pb, 10); |
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242 | |||
243 | pkt->stream_index = flic->audio_stream_index; |
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244 | pkt->pos = avio_tell(pb); |
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245 | ret = avio_read(pb, pkt->data, size); |
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246 | |||
247 | if (ret != size) { |
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248 | av_free_packet(pkt); |
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249 | ret = AVERROR(EIO); |
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250 | } |
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251 | |||
252 | packet_read = 1; |
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253 | } else { |
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254 | /* not interested in this chunk */ |
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255 | avio_skip(pb, size - 6); |
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256 | } |
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257 | } |
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258 | |||
259 | return ret; |
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260 | } |
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261 | |||
262 | AVInputFormat ff_flic_demuxer = { |
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263 | .name = "flic", |
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264 | .long_name = NULL_IF_CONFIG_SMALL("FLI/FLC/FLX animation"), |
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265 | .priv_data_size = sizeof(FlicDemuxContext), |
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266 | .read_probe = flic_probe, |
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267 | .read_header = flic_read_header, |
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268 | .read_packet = flic_read_packet, |
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269 | };> |