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4349 | Serge | 1 | /* |
2 | * Bethsoft VID format Demuxer |
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3 | * Copyright (c) 2007 Nicholas Tung |
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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 | * @brief Bethesda Softworks VID (.vid) file demuxer |
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25 | * @author Nicholas Tung [ntung (at. ntung com] (2007-03) |
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26 | * @see http://wiki.multimedia.cx/index.php?title=Bethsoft_VID |
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27 | * @see http://www.svatopluk.com/andux/docs/dfvid.html |
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28 | */ |
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29 | |||
30 | #include "libavutil/channel_layout.h" |
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31 | #include "libavutil/intreadwrite.h" |
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32 | #include "avformat.h" |
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33 | #include "internal.h" |
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34 | #include "libavcodec/bethsoftvideo.h" |
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35 | |||
36 | #define BVID_PALETTE_SIZE 3 * 256 |
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37 | |||
38 | #define DEFAULT_SAMPLE_RATE 11111 |
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39 | |||
40 | typedef struct BVID_DemuxContext |
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41 | { |
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42 | int nframes; |
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43 | int sample_rate; /**< audio sample rate */ |
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44 | int width; /**< video width */ |
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45 | int height; /**< video height */ |
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46 | /** delay value between frames, added to individual frame delay. |
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47 | * custom units, which will be added to other custom units (~=16ms according |
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48 | * to free, unofficial documentation) */ |
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49 | int bethsoft_global_delay; |
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50 | int video_index; /**< video stream index */ |
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51 | int audio_index; /**< audio stream index */ |
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52 | uint8_t *palette; |
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53 | |||
54 | int is_finished; |
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55 | |||
56 | } BVID_DemuxContext; |
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57 | |||
58 | static int vid_probe(AVProbeData *p) |
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59 | { |
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60 | // little-endian VID tag, file starts with "VID\0" |
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61 | if (AV_RL32(p->buf) != MKTAG('V', 'I', 'D', 0)) |
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62 | return 0; |
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63 | |||
64 | return AVPROBE_SCORE_MAX; |
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65 | } |
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66 | |||
67 | static int vid_read_header(AVFormatContext *s) |
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68 | { |
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69 | BVID_DemuxContext *vid = s->priv_data; |
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70 | AVIOContext *pb = s->pb; |
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71 | |||
72 | /* load main header. Contents: |
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73 | * bytes: 'V' 'I' 'D' |
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74 | * int16s: always_512, nframes, width, height, delay, always_14 |
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75 | */ |
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76 | avio_skip(pb, 5); |
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77 | vid->nframes = avio_rl16(pb); |
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78 | vid->width = avio_rl16(pb); |
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79 | vid->height = avio_rl16(pb); |
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80 | vid->bethsoft_global_delay = avio_rl16(pb); |
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81 | avio_rl16(pb); |
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82 | |||
83 | // wait until the first packet to create each stream |
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84 | vid->video_index = -1; |
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85 | vid->audio_index = -1; |
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86 | vid->sample_rate = DEFAULT_SAMPLE_RATE; |
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87 | s->ctx_flags |= AVFMTCTX_NOHEADER; |
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88 | |||
89 | return 0; |
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90 | } |
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91 | |||
92 | #define BUFFER_PADDING_SIZE 1000 |
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93 | static int read_frame(BVID_DemuxContext *vid, AVIOContext *pb, AVPacket *pkt, |
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94 | uint8_t block_type, AVFormatContext *s) |
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95 | { |
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96 | uint8_t * vidbuf_start = NULL; |
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97 | int vidbuf_nbytes = 0; |
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98 | int code; |
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99 | int bytes_copied = 0; |
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100 | int position, duration, npixels; |
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101 | unsigned int vidbuf_capacity; |
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102 | int ret = 0; |
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103 | AVStream *st; |
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104 | |||
105 | if (vid->video_index < 0) { |
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106 | st = avformat_new_stream(s, NULL); |
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107 | if (!st) |
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108 | return AVERROR(ENOMEM); |
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109 | vid->video_index = st->index; |
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110 | if (vid->audio_index < 0) { |
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111 | avpriv_request_sample(s, "Using default video time base since " |
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112 | "having no audio packet before the first " |
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113 | "video packet"); |
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114 | } |
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115 | avpriv_set_pts_info(st, 64, 185, vid->sample_rate); |
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116 | st->codec->codec_type = AVMEDIA_TYPE_VIDEO; |
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117 | st->codec->codec_id = AV_CODEC_ID_BETHSOFTVID; |
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118 | st->codec->width = vid->width; |
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119 | st->codec->height = vid->height; |
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120 | } |
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121 | st = s->streams[vid->video_index]; |
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122 | npixels = st->codec->width * st->codec->height; |
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123 | |||
124 | vidbuf_start = av_malloc(vidbuf_capacity = BUFFER_PADDING_SIZE); |
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125 | if(!vidbuf_start) |
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126 | return AVERROR(ENOMEM); |
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127 | |||
128 | // save the file position for the packet, include block type |
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129 | position = avio_tell(pb) - 1; |
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130 | |||
131 | vidbuf_start[vidbuf_nbytes++] = block_type; |
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132 | |||
133 | // get the current packet duration |
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134 | duration = vid->bethsoft_global_delay + avio_rl16(pb); |
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135 | |||
136 | // set the y offset if it exists (decoder header data should be in data section) |
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137 | if(block_type == VIDEO_YOFF_P_FRAME){ |
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138 | if (avio_read(pb, &vidbuf_start[vidbuf_nbytes], 2) != 2) { |
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139 | ret = AVERROR(EIO); |
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140 | goto fail; |
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141 | } |
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142 | vidbuf_nbytes += 2; |
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143 | } |
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144 | |||
145 | do{ |
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146 | vidbuf_start = av_fast_realloc(vidbuf_start, &vidbuf_capacity, vidbuf_nbytes + BUFFER_PADDING_SIZE); |
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147 | if(!vidbuf_start) |
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148 | return AVERROR(ENOMEM); |
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149 | |||
150 | code = avio_r8(pb); |
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151 | vidbuf_start[vidbuf_nbytes++] = code; |
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152 | |||
153 | if(code >= 0x80){ // rle sequence |
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154 | if(block_type == VIDEO_I_FRAME) |
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155 | vidbuf_start[vidbuf_nbytes++] = avio_r8(pb); |
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156 | } else if(code){ // plain sequence |
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157 | if (avio_read(pb, &vidbuf_start[vidbuf_nbytes], code) != code) { |
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158 | ret = AVERROR(EIO); |
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159 | goto fail; |
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160 | } |
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161 | vidbuf_nbytes += code; |
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162 | } |
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163 | bytes_copied += code & 0x7F; |
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164 | if(bytes_copied == npixels){ // sometimes no stop character is given, need to keep track of bytes copied |
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165 | // may contain a 0 byte even if read all pixels |
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166 | if(avio_r8(pb)) |
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167 | avio_seek(pb, -1, SEEK_CUR); |
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168 | break; |
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169 | } |
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170 | if (bytes_copied > npixels) { |
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171 | ret = AVERROR_INVALIDDATA; |
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172 | goto fail; |
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173 | } |
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174 | } while(code); |
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175 | |||
176 | // copy data into packet |
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177 | if ((ret = av_new_packet(pkt, vidbuf_nbytes)) < 0) |
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178 | goto fail; |
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179 | memcpy(pkt->data, vidbuf_start, vidbuf_nbytes); |
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180 | av_free(vidbuf_start); |
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181 | |||
182 | pkt->pos = position; |
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183 | pkt->stream_index = vid->video_index; |
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184 | pkt->duration = duration; |
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185 | if (block_type == VIDEO_I_FRAME) |
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186 | pkt->flags |= AV_PKT_FLAG_KEY; |
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187 | |||
188 | /* if there is a new palette available, add it to packet side data */ |
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189 | if (vid->palette) { |
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190 | uint8_t *pdata = av_packet_new_side_data(pkt, AV_PKT_DATA_PALETTE, |
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191 | BVID_PALETTE_SIZE); |
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192 | if (pdata) |
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193 | memcpy(pdata, vid->palette, BVID_PALETTE_SIZE); |
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194 | av_freep(&vid->palette); |
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195 | } |
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196 | |||
197 | vid->nframes--; // used to check if all the frames were read |
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198 | return 0; |
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199 | fail: |
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200 | av_free(vidbuf_start); |
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201 | return ret; |
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202 | } |
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203 | |||
204 | static int vid_read_packet(AVFormatContext *s, |
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205 | AVPacket *pkt) |
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206 | { |
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207 | BVID_DemuxContext *vid = s->priv_data; |
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208 | AVIOContext *pb = s->pb; |
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209 | unsigned char block_type; |
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210 | int audio_length; |
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211 | int ret_value; |
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212 | |||
213 | if(vid->is_finished || url_feof(pb)) |
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214 | return AVERROR_EOF; |
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215 | |||
216 | block_type = avio_r8(pb); |
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217 | switch(block_type){ |
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218 | case PALETTE_BLOCK: |
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219 | if (vid->palette) { |
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220 | av_log(s, AV_LOG_WARNING, "discarding unused palette\n"); |
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221 | av_freep(&vid->palette); |
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222 | } |
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223 | vid->palette = av_malloc(BVID_PALETTE_SIZE); |
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224 | if (!vid->palette) |
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225 | return AVERROR(ENOMEM); |
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226 | if (avio_read(pb, vid->palette, BVID_PALETTE_SIZE) != BVID_PALETTE_SIZE) { |
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227 | av_freep(&vid->palette); |
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228 | return AVERROR(EIO); |
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229 | } |
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230 | return vid_read_packet(s, pkt); |
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231 | |||
232 | case FIRST_AUDIO_BLOCK: |
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233 | avio_rl16(pb); |
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234 | // soundblaster DAC used for sample rate, as on specification page (link above) |
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235 | vid->sample_rate = 1000000 / (256 - avio_r8(pb)); |
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236 | case AUDIO_BLOCK: |
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237 | if (vid->audio_index < 0) { |
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238 | AVStream *st = avformat_new_stream(s, NULL); |
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239 | if (!st) |
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240 | return AVERROR(ENOMEM); |
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241 | vid->audio_index = st->index; |
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242 | st->codec->codec_type = AVMEDIA_TYPE_AUDIO; |
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243 | st->codec->codec_id = AV_CODEC_ID_PCM_U8; |
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244 | st->codec->channels = 1; |
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245 | st->codec->channel_layout = AV_CH_LAYOUT_MONO; |
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246 | st->codec->bits_per_coded_sample = 8; |
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247 | st->codec->sample_rate = vid->sample_rate; |
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248 | st->codec->bit_rate = 8 * st->codec->sample_rate; |
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249 | st->start_time = 0; |
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250 | avpriv_set_pts_info(st, 64, 1, vid->sample_rate); |
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251 | } |
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252 | audio_length = avio_rl16(pb); |
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253 | if ((ret_value = av_get_packet(pb, pkt, audio_length)) != audio_length) { |
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254 | if (ret_value < 0) |
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255 | return ret_value; |
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256 | av_log(s, AV_LOG_ERROR, "incomplete audio block\n"); |
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257 | return AVERROR(EIO); |
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258 | } |
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259 | pkt->stream_index = vid->audio_index; |
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260 | pkt->duration = audio_length; |
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261 | pkt->flags |= AV_PKT_FLAG_KEY; |
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262 | return 0; |
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263 | |||
264 | case VIDEO_P_FRAME: |
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265 | case VIDEO_YOFF_P_FRAME: |
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266 | case VIDEO_I_FRAME: |
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267 | return read_frame(vid, pb, pkt, block_type, s); |
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268 | |||
269 | case EOF_BLOCK: |
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270 | if(vid->nframes != 0) |
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271 | av_log(s, AV_LOG_VERBOSE, "reached terminating character but not all frames read.\n"); |
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272 | vid->is_finished = 1; |
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273 | return AVERROR(EIO); |
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274 | default: |
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275 | av_log(s, AV_LOG_ERROR, "unknown block (character = %c, decimal = %d, hex = %x)!!!\n", |
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276 | block_type, block_type, block_type); |
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277 | return AVERROR_INVALIDDATA; |
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278 | } |
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279 | } |
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280 | |||
281 | static int vid_read_close(AVFormatContext *s) |
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282 | { |
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283 | BVID_DemuxContext *vid = s->priv_data; |
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284 | av_freep(&vid->palette); |
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285 | return 0; |
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286 | } |
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287 | |||
288 | AVInputFormat ff_bethsoftvid_demuxer = { |
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289 | .name = "bethsoftvid", |
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290 | .long_name = NULL_IF_CONFIG_SMALL("Bethesda Softworks VID"), |
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291 | .priv_data_size = sizeof(BVID_DemuxContext), |
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292 | .read_probe = vid_probe, |
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293 | .read_header = vid_read_header, |
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294 | .read_packet = vid_read_packet, |
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295 | .read_close = vid_read_close, |
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296 | };>>>>>>>>>> |