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Rev | Author | Line No. | Line |
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4349 | Serge | 1 | /* |
2 | * Bitmap Brothers JV demuxer |
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3 | * Copyright (c) 2005, 2011 Peter Ross |
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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 | * Bitmap Brothers JV demuxer |
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25 | * @author Peter Ross |
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26 | */ |
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27 | |||
28 | #include "libavutil/channel_layout.h" |
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29 | #include "libavutil/intreadwrite.h" |
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30 | #include "avformat.h" |
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31 | #include "internal.h" |
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32 | |||
33 | #define JV_PREAMBLE_SIZE 5 |
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34 | |||
35 | typedef struct { |
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36 | int audio_size; /**< audio packet size (bytes) */ |
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37 | int video_size; /**< video packet size (bytes) */ |
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38 | int palette_size; /**< palette size (bytes) */ |
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39 | int video_type; /**< per-frame video compression type */ |
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40 | } JVFrame; |
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41 | |||
42 | typedef struct { |
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43 | JVFrame *frames; |
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44 | enum { |
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45 | JV_AUDIO = 0, |
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46 | JV_VIDEO, |
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47 | JV_PADDING |
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48 | } state; |
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49 | int64_t pts; |
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50 | } JVDemuxContext; |
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51 | |||
52 | #define MAGIC " Compression by John M Phillips Copyright (C) 1995 The Bitmap Brothers Ltd." |
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53 | |||
54 | static int read_probe(AVProbeData *pd) |
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55 | { |
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56 | if (pd->buf[0] == 'J' && pd->buf[1] == 'V' && strlen(MAGIC) <= pd->buf_size - 4 && |
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57 | !memcmp(pd->buf + 4, MAGIC, strlen(MAGIC))) |
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58 | return AVPROBE_SCORE_MAX; |
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59 | return 0; |
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60 | } |
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61 | |||
62 | static int read_header(AVFormatContext *s) |
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63 | { |
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64 | JVDemuxContext *jv = s->priv_data; |
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65 | AVIOContext *pb = s->pb; |
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66 | AVStream *vst, *ast; |
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67 | int64_t audio_pts = 0; |
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68 | int64_t offset; |
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69 | int i; |
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70 | |||
71 | avio_skip(pb, 80); |
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72 | |||
73 | ast = avformat_new_stream(s, NULL); |
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74 | vst = avformat_new_stream(s, NULL); |
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75 | if (!ast || !vst) |
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76 | return AVERROR(ENOMEM); |
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77 | |||
78 | vst->codec->codec_type = AVMEDIA_TYPE_VIDEO; |
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79 | vst->codec->codec_id = AV_CODEC_ID_JV; |
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80 | vst->codec->codec_tag = 0; /* no fourcc */ |
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81 | vst->codec->width = avio_rl16(pb); |
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82 | vst->codec->height = avio_rl16(pb); |
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83 | vst->duration = |
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84 | vst->nb_frames = |
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85 | ast->nb_index_entries = avio_rl16(pb); |
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86 | avpriv_set_pts_info(vst, 64, avio_rl16(pb), 1000); |
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87 | |||
88 | avio_skip(pb, 4); |
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89 | |||
90 | ast->codec->codec_type = AVMEDIA_TYPE_AUDIO; |
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91 | ast->codec->codec_id = AV_CODEC_ID_PCM_U8; |
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92 | ast->codec->codec_tag = 0; /* no fourcc */ |
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93 | ast->codec->sample_rate = avio_rl16(pb); |
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94 | ast->codec->channels = 1; |
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95 | ast->codec->channel_layout = AV_CH_LAYOUT_MONO; |
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96 | avpriv_set_pts_info(ast, 64, 1, ast->codec->sample_rate); |
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97 | |||
98 | avio_skip(pb, 10); |
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99 | |||
100 | ast->index_entries = av_malloc(ast->nb_index_entries * sizeof(*ast->index_entries)); |
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101 | if (!ast->index_entries) |
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102 | return AVERROR(ENOMEM); |
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103 | |||
104 | jv->frames = av_malloc(ast->nb_index_entries * sizeof(JVFrame)); |
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105 | if (!jv->frames) |
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106 | return AVERROR(ENOMEM); |
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107 | |||
108 | offset = 0x68 + ast->nb_index_entries * 16; |
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109 | for(i = 0; i < ast->nb_index_entries; i++) { |
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110 | AVIndexEntry *e = ast->index_entries + i; |
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111 | JVFrame *jvf = jv->frames + i; |
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112 | |||
113 | /* total frame size including audio, video, palette data and padding */ |
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114 | e->size = avio_rl32(pb); |
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115 | e->timestamp = i; |
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116 | e->pos = offset; |
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117 | offset += e->size; |
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118 | |||
119 | jvf->audio_size = avio_rl32(pb); |
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120 | jvf->video_size = avio_rl32(pb); |
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121 | jvf->palette_size = avio_r8(pb) ? 768 : 0; |
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122 | jvf->video_size = FFMIN(FFMAX(jvf->video_size, 0), |
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123 | INT_MAX - JV_PREAMBLE_SIZE - jvf->palette_size); |
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124 | if (avio_r8(pb)) |
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125 | av_log(s, AV_LOG_WARNING, "unsupported audio codec\n"); |
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126 | jvf->video_type = avio_r8(pb); |
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127 | avio_skip(pb, 1); |
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128 | |||
129 | e->timestamp = jvf->audio_size ? audio_pts : AV_NOPTS_VALUE; |
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130 | audio_pts += jvf->audio_size; |
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131 | |||
132 | e->flags = jvf->video_type != 1 ? AVINDEX_KEYFRAME : 0; |
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133 | } |
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134 | |||
135 | jv->state = JV_AUDIO; |
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136 | return 0; |
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137 | } |
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138 | |||
139 | static int read_packet(AVFormatContext *s, AVPacket *pkt) |
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140 | { |
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141 | JVDemuxContext *jv = s->priv_data; |
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142 | AVIOContext *pb = s->pb; |
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143 | AVStream *ast = s->streams[0]; |
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144 | |||
145 | while (!url_feof(s->pb) && jv->pts < ast->nb_index_entries) { |
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146 | const AVIndexEntry *e = ast->index_entries + jv->pts; |
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147 | const JVFrame *jvf = jv->frames + jv->pts; |
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148 | |||
149 | switch(jv->state) { |
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150 | case JV_AUDIO: |
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151 | jv->state++; |
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152 | if (jvf->audio_size ) { |
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153 | if (av_get_packet(s->pb, pkt, jvf->audio_size) < 0) |
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154 | return AVERROR(ENOMEM); |
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155 | pkt->stream_index = 0; |
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156 | pkt->pts = e->timestamp; |
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157 | pkt->flags |= AV_PKT_FLAG_KEY; |
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158 | return 0; |
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159 | } |
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160 | case JV_VIDEO: |
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161 | jv->state++; |
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162 | if (jvf->video_size || jvf->palette_size) { |
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163 | int size = jvf->video_size + jvf->palette_size; |
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164 | if (av_new_packet(pkt, size + JV_PREAMBLE_SIZE)) |
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165 | return AVERROR(ENOMEM); |
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166 | |||
167 | AV_WL32(pkt->data, jvf->video_size); |
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168 | pkt->data[4] = jvf->video_type; |
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169 | if ((size = avio_read(pb, pkt->data + JV_PREAMBLE_SIZE, size)) < 0) |
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170 | return AVERROR(EIO); |
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171 | |||
172 | pkt->size = size + JV_PREAMBLE_SIZE; |
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173 | pkt->stream_index = 1; |
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174 | pkt->pts = jv->pts; |
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175 | if (jvf->video_type != 1) |
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176 | pkt->flags |= AV_PKT_FLAG_KEY; |
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177 | return 0; |
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178 | } |
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179 | case JV_PADDING: |
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180 | avio_skip(pb, FFMAX(e->size - jvf->audio_size - jvf->video_size |
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181 | - jvf->palette_size, 0)); |
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182 | jv->state = JV_AUDIO; |
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183 | jv->pts++; |
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184 | } |
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185 | } |
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186 | |||
187 | return AVERROR(EIO); |
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188 | } |
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189 | |||
190 | static int read_seek(AVFormatContext *s, int stream_index, |
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191 | int64_t ts, int flags) |
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192 | { |
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193 | JVDemuxContext *jv = s->priv_data; |
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194 | AVStream *ast = s->streams[0]; |
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195 | int i; |
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196 | |||
197 | if (flags & (AVSEEK_FLAG_BYTE|AVSEEK_FLAG_FRAME)) |
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198 | return AVERROR(ENOSYS); |
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199 | |||
200 | switch(stream_index) { |
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201 | case 0: |
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202 | i = av_index_search_timestamp(ast, ts, flags); |
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203 | break; |
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204 | case 1: |
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205 | i = ts; |
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206 | break; |
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207 | default: |
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208 | return 0; |
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209 | } |
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210 | |||
211 | if (i < 0 || i >= ast->nb_index_entries) |
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212 | return 0; |
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213 | if (avio_seek(s->pb, ast->index_entries[i].pos, SEEK_SET) < 0) |
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214 | return -1; |
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215 | |||
216 | jv->state = JV_AUDIO; |
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217 | jv->pts = i; |
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218 | return 0; |
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219 | } |
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220 | |||
221 | static int read_close(AVFormatContext *s) |
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222 | { |
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223 | JVDemuxContext *jv = s->priv_data; |
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224 | |||
225 | av_freep(&jv->frames); |
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226 | |||
227 | return 0; |
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228 | } |
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229 | |||
230 | AVInputFormat ff_jv_demuxer = { |
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231 | .name = "jv", |
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232 | .long_name = NULL_IF_CONFIG_SMALL("Bitmap Brothers JV"), |
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233 | .priv_data_size = sizeof(JVDemuxContext), |
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234 | .read_probe = read_probe, |
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235 | .read_header = read_header, |
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236 | .read_packet = read_packet, |
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237 | .read_seek = read_seek, |
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238 | .read_close = read_close, |
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239 | };>>>>>>=>>>>> |