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Rev | Author | Line No. | Line |
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6148 | serge | 1 | /* |
2 | * Interplay C93 demuxer |
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3 | * Copyright (c) 2007 Anssi Hannula |
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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 "avformat.h" |
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23 | #include "internal.h" |
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24 | #include "voc.h" |
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25 | #include "libavutil/intreadwrite.h" |
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26 | |||
27 | typedef struct { |
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28 | uint16_t index; |
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29 | uint8_t length; |
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30 | uint8_t frames; |
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31 | } C93BlockRecord; |
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32 | |||
33 | typedef struct { |
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34 | VocDecContext voc; |
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35 | |||
36 | C93BlockRecord block_records[512]; |
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37 | int current_block; |
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38 | |||
39 | uint32_t frame_offsets[32]; |
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40 | int current_frame; |
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41 | int next_pkt_is_audio; |
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42 | |||
43 | AVStream *audio; |
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44 | } C93DemuxContext; |
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45 | |||
46 | static int probe(AVProbeData *p) |
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47 | { |
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48 | int i; |
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49 | int index = 1; |
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50 | if (p->buf_size < 16) |
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51 | return 0; |
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52 | for (i = 0; i < 16; i += 4) { |
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53 | if (AV_RL16(p->buf + i) != index || !p->buf[i + 2] || !p->buf[i + 3]) |
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54 | return 0; |
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55 | index += p->buf[i + 2]; |
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56 | } |
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57 | return AVPROBE_SCORE_MAX; |
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58 | } |
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59 | |||
60 | static int read_header(AVFormatContext *s) |
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61 | { |
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62 | AVStream *video; |
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63 | AVIOContext *pb = s->pb; |
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64 | C93DemuxContext *c93 = s->priv_data; |
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65 | int i; |
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66 | int framecount = 0; |
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67 | |||
68 | for (i = 0; i < 512; i++) { |
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69 | c93->block_records[i].index = avio_rl16(pb); |
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70 | c93->block_records[i].length = avio_r8(pb); |
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71 | c93->block_records[i].frames = avio_r8(pb); |
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72 | if (c93->block_records[i].frames > 32) { |
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73 | av_log(s, AV_LOG_ERROR, "too many frames in block\n"); |
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74 | return AVERROR_INVALIDDATA; |
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75 | } |
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76 | framecount += c93->block_records[i].frames; |
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77 | } |
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78 | |||
79 | /* Audio streams are added if audio packets are found */ |
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80 | s->ctx_flags |= AVFMTCTX_NOHEADER; |
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81 | |||
82 | video = avformat_new_stream(s, NULL); |
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83 | if (!video) |
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84 | return AVERROR(ENOMEM); |
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85 | |||
86 | video->codec->codec_type = AVMEDIA_TYPE_VIDEO; |
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87 | video->codec->codec_id = AV_CODEC_ID_C93; |
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88 | video->codec->width = 320; |
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89 | video->codec->height = 192; |
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90 | /* 4:3 320x200 with 8 empty lines */ |
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91 | video->sample_aspect_ratio = (AVRational) { 5, 6 }; |
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92 | avpriv_set_pts_info(video, 64, 2, 25); |
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93 | video->nb_frames = framecount; |
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94 | video->duration = framecount; |
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95 | video->start_time = 0; |
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96 | |||
97 | c93->current_block = 0; |
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98 | c93->current_frame = 0; |
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99 | c93->next_pkt_is_audio = 0; |
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100 | return 0; |
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101 | } |
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102 | |||
103 | #define C93_HAS_PALETTE 0x01 |
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104 | #define C93_FIRST_FRAME 0x02 |
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105 | |||
106 | static int read_packet(AVFormatContext *s, AVPacket *pkt) |
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107 | { |
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108 | AVIOContext *pb = s->pb; |
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109 | C93DemuxContext *c93 = s->priv_data; |
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110 | C93BlockRecord *br = &c93->block_records[c93->current_block]; |
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111 | int datasize; |
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112 | int ret, i; |
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113 | |||
114 | if (c93->next_pkt_is_audio) { |
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115 | c93->current_frame++; |
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116 | c93->next_pkt_is_audio = 0; |
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117 | datasize = avio_rl16(pb); |
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118 | if (datasize > 42) { |
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119 | if (!c93->audio) { |
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120 | c93->audio = avformat_new_stream(s, NULL); |
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121 | if (!c93->audio) |
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122 | return AVERROR(ENOMEM); |
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123 | c93->audio->codec->codec_type = AVMEDIA_TYPE_AUDIO; |
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124 | } |
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125 | avio_skip(pb, 26); /* VOC header */ |
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126 | ret = ff_voc_get_packet(s, pkt, c93->audio, datasize - 26); |
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127 | if (ret > 0) { |
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128 | pkt->stream_index = 1; |
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129 | pkt->flags |= AV_PKT_FLAG_KEY; |
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130 | return ret; |
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131 | } |
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132 | } |
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133 | } |
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134 | if (c93->current_frame >= br->frames) { |
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135 | if (c93->current_block >= 511 || !br[1].length) |
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136 | return AVERROR_EOF; |
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137 | br++; |
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138 | c93->current_block++; |
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139 | c93->current_frame = 0; |
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140 | } |
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141 | |||
142 | if (c93->current_frame == 0) { |
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143 | avio_seek(pb, br->index * 2048, SEEK_SET); |
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144 | for (i = 0; i < 32; i++) { |
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145 | c93->frame_offsets[i] = avio_rl32(pb); |
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146 | } |
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147 | } |
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148 | |||
149 | avio_seek(pb,br->index * 2048 + |
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150 | c93->frame_offsets[c93->current_frame], SEEK_SET); |
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151 | datasize = avio_rl16(pb); /* video frame size */ |
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152 | |||
153 | ret = av_new_packet(pkt, datasize + 768 + 1); |
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154 | if (ret < 0) |
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155 | return ret; |
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156 | pkt->data[0] = 0; |
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157 | pkt->size = datasize + 1; |
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158 | |||
159 | ret = avio_read(pb, pkt->data + 1, datasize); |
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160 | if (ret < datasize) { |
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161 | ret = AVERROR(EIO); |
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162 | goto fail; |
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163 | } |
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164 | |||
165 | datasize = avio_rl16(pb); /* palette size */ |
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166 | if (datasize) { |
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167 | if (datasize != 768) { |
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168 | av_log(s, AV_LOG_ERROR, "invalid palette size %u\n", datasize); |
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169 | ret = AVERROR_INVALIDDATA; |
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170 | goto fail; |
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171 | } |
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172 | pkt->data[0] |= C93_HAS_PALETTE; |
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173 | ret = avio_read(pb, pkt->data + pkt->size, datasize); |
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174 | if (ret < datasize) { |
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175 | ret = AVERROR(EIO); |
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176 | goto fail; |
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177 | } |
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178 | pkt->size += 768; |
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179 | } |
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180 | pkt->stream_index = 0; |
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181 | c93->next_pkt_is_audio = 1; |
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182 | |||
183 | /* only the first frame is guaranteed to not reference previous frames */ |
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184 | if (c93->current_block == 0 && c93->current_frame == 0) { |
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185 | pkt->flags |= AV_PKT_FLAG_KEY; |
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186 | pkt->data[0] |= C93_FIRST_FRAME; |
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187 | } |
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188 | return 0; |
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189 | |||
190 | fail: |
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191 | av_free_packet(pkt); |
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192 | return ret; |
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193 | } |
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194 | |||
195 | AVInputFormat ff_c93_demuxer = { |
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196 | .name = "c93", |
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197 | .long_name = NULL_IF_CONFIG_SMALL("Interplay C93"), |
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198 | .priv_data_size = sizeof(C93DemuxContext), |
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199 | .read_probe = probe, |
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200 | .read_header = read_header, |
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201 | .read_packet = read_packet, |
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202 | };>>>>>>> |