1/* 2 * Bitmap Brothers JV demuxer 3 * Copyright (c) 2005, 2011 Peter Ross <pross@xvid.org> 4 * 5 * This file is part of FFmpeg. 6 * 7 * FFmpeg is free software; you can redistribute it and/or 8 * modify it under the terms of the GNU Lesser General Public 9 * License as published by the Free Software Foundation; either 10 * version 2.1 of the License, or (at your option) any later version. 11 * 12 * FFmpeg is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 15 * Lesser General Public License for more details. 16 * 17 * You should have received a copy of the GNU Lesser General Public 18 * License along with FFmpeg; if not, write to the Free Software 19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 20 */ 21 22/** 23 * @file 24 * Bitmap Brothers JV demuxer 25 * @author Peter Ross <pross@xvid.org> 26 */ 27 28#include "libavutil/channel_layout.h" 29#include "libavutil/intreadwrite.h" 30 31#include "avformat.h" 32#include "internal.h" 33 34#define JV_PREAMBLE_SIZE 5 35 36typedef struct { 37 int audio_size; /**< audio packet size (bytes) */ 38 int video_size; /**< video packet size (bytes) */ 39 int palette_size; /**< palette size (bytes) */ 40 int video_type; /**< per-frame video compression type */ 41} JVFrame; 42 43typedef struct { 44 JVFrame *frames; 45 enum { 46 JV_AUDIO = 0, 47 JV_VIDEO, 48 JV_PADDING 49 } state; 50 int64_t pts; 51} JVDemuxContext; 52 53#define MAGIC " Compression by John M Phillips Copyright (C) 1995 The Bitmap Brothers Ltd." 54 55static int read_probe(AVProbeData *pd) 56{ 57 if (pd->buf[0] == 'J' && pd->buf[1] == 'V' && strlen(MAGIC) <= pd->buf_size - 4 && 58 !memcmp(pd->buf + 4, MAGIC, strlen(MAGIC))) 59 return AVPROBE_SCORE_MAX; 60 return 0; 61} 62 63static int read_close(AVFormatContext *s) 64{ 65 JVDemuxContext *jv = s->priv_data; 66 67 av_freep(&jv->frames); 68 69 return 0; 70} 71 72static int read_header(AVFormatContext *s) 73{ 74 JVDemuxContext *jv = s->priv_data; 75 AVIOContext *pb = s->pb; 76 AVStream *vst, *ast; 77 int64_t audio_pts = 0; 78 int64_t offset; 79 int i; 80 81 avio_skip(pb, 80); 82 83 ast = avformat_new_stream(s, NULL); 84 vst = avformat_new_stream(s, NULL); 85 if (!ast || !vst) 86 return AVERROR(ENOMEM); 87 88 vst->codec->codec_type = AVMEDIA_TYPE_VIDEO; 89 vst->codec->codec_id = AV_CODEC_ID_JV; 90 vst->codec->codec_tag = 0; /* no fourcc */ 91 vst->codec->width = avio_rl16(pb); 92 vst->codec->height = avio_rl16(pb); 93 vst->duration = 94 vst->nb_frames = 95 ast->nb_index_entries = avio_rl16(pb); 96 avpriv_set_pts_info(vst, 64, avio_rl16(pb), 1000); 97 98 avio_skip(pb, 4); 99 100 ast->codec->codec_type = AVMEDIA_TYPE_AUDIO; 101 ast->codec->codec_id = AV_CODEC_ID_PCM_U8; 102 ast->codec->codec_tag = 0; /* no fourcc */ 103 ast->codec->sample_rate = avio_rl16(pb); 104 ast->codec->channels = 1; 105 ast->codec->channel_layout = AV_CH_LAYOUT_MONO; 106 avpriv_set_pts_info(ast, 64, 1, ast->codec->sample_rate); 107 108 avio_skip(pb, 10); 109 110 ast->index_entries = av_malloc(ast->nb_index_entries * 111 sizeof(*ast->index_entries)); 112 if (!ast->index_entries) 113 return AVERROR(ENOMEM); 114 115 jv->frames = av_malloc(ast->nb_index_entries * sizeof(JVFrame)); 116 if (!jv->frames) 117 return AVERROR(ENOMEM); 118 119 offset = 0x68 + ast->nb_index_entries * 16; 120 for (i = 0; i < ast->nb_index_entries; i++) { 121 AVIndexEntry *e = ast->index_entries + i; 122 JVFrame *jvf = jv->frames + i; 123 124 /* total frame size including audio, video, palette data and padding */ 125 e->size = avio_rl32(pb); 126 e->timestamp = i; 127 e->pos = offset; 128 offset += e->size; 129 130 jvf->audio_size = avio_rl32(pb); 131 jvf->video_size = avio_rl32(pb); 132 jvf->palette_size = avio_r8(pb) ? 768 : 0; 133 134 if ((jvf->video_size | jvf->audio_size) & ~0xFFFFFF || 135 e->size - jvf->audio_size 136 - jvf->video_size 137 - jvf->palette_size < 0) { 138 if (s->error_recognition & AV_EF_EXPLODE) { 139 read_close(s); 140 return AVERROR_INVALIDDATA; 141 } 142 jvf->audio_size = 143 jvf->video_size = 144 jvf->palette_size = 0; 145 } 146 147 if (avio_r8(pb)) 148 av_log(s, AV_LOG_WARNING, "unsupported audio codec\n"); 149 150 jvf->video_type = avio_r8(pb); 151 avio_skip(pb, 1); 152 153 e->timestamp = jvf->audio_size ? audio_pts : AV_NOPTS_VALUE; 154 audio_pts += jvf->audio_size; 155 156 e->flags = jvf->video_type != 1 ? AVINDEX_KEYFRAME : 0; 157 } 158 159 jv->state = JV_AUDIO; 160 return 0; 161} 162 163static int read_packet(AVFormatContext *s, AVPacket *pkt) 164{ 165 JVDemuxContext *jv = s->priv_data; 166 AVIOContext *pb = s->pb; 167 AVStream *ast = s->streams[0]; 168 169 while (!url_feof(s->pb) && jv->pts < ast->nb_index_entries) { 170 const AVIndexEntry *e = ast->index_entries + jv->pts; 171 const JVFrame *jvf = jv->frames + jv->pts; 172 173 switch (jv->state) { 174 case JV_AUDIO: 175 jv->state++; 176 if (jvf->audio_size) { 177 if (av_get_packet(s->pb, pkt, jvf->audio_size) < 0) 178 return AVERROR(ENOMEM); 179 pkt->stream_index = 0; 180 pkt->pts = e->timestamp; 181 pkt->flags |= AV_PKT_FLAG_KEY; 182 return 0; 183 } 184 case JV_VIDEO: 185 jv->state++; 186 if (jvf->video_size || jvf->palette_size) { 187 int ret; 188 int size = jvf->video_size + jvf->palette_size; 189 if (av_new_packet(pkt, size + JV_PREAMBLE_SIZE)) 190 return AVERROR(ENOMEM); 191 192 AV_WL32(pkt->data, jvf->video_size); 193 pkt->data[4] = jvf->video_type; 194 ret = avio_read(pb, pkt->data + JV_PREAMBLE_SIZE, size); 195 if (ret < 0) 196 return ret; 197 if (ret < size) { 198 memset(pkt->data + JV_PREAMBLE_SIZE + ret, 0, 199 FF_INPUT_BUFFER_PADDING_SIZE); 200 pkt->flags |= AV_PKT_FLAG_CORRUPT; 201 } 202 pkt->size = ret + JV_PREAMBLE_SIZE; 203 pkt->stream_index = 1; 204 pkt->pts = jv->pts; 205 if (jvf->video_type != 1) 206 pkt->flags |= AV_PKT_FLAG_KEY; 207 return 0; 208 } 209 case JV_PADDING: 210 avio_skip(pb, FFMAX(e->size - jvf->audio_size - jvf->video_size 211 - jvf->palette_size, 0)); 212 jv->state = JV_AUDIO; 213 jv->pts++; 214 } 215 } 216 217 if (s->pb->eof_reached) 218 return AVERROR_EOF; 219 220 return AVERROR(EIO); 221} 222 223static int read_seek(AVFormatContext *s, int stream_index, 224 int64_t ts, int flags) 225{ 226 JVDemuxContext *jv = s->priv_data; 227 AVStream *ast = s->streams[0]; 228 int i; 229 230 if (flags & (AVSEEK_FLAG_BYTE | AVSEEK_FLAG_FRAME)) 231 return AVERROR(ENOSYS); 232 233 switch (stream_index) { 234 case 0: 235 i = av_index_search_timestamp(ast, ts, flags); 236 break; 237 case 1: 238 i = ts; 239 break; 240 default: 241 return 0; 242 } 243 244 if (i < 0 || i >= ast->nb_index_entries) 245 return 0; 246 if (avio_seek(s->pb, ast->index_entries[i].pos, SEEK_SET) < 0) 247 return -1; 248 249 jv->state = JV_AUDIO; 250 jv->pts = i; 251 return 0; 252} 253 254AVInputFormat ff_jv_demuxer = { 255 .name = "jv", 256 .long_name = NULL_IF_CONFIG_SMALL("Bitmap Brothers JV"), 257 .priv_data_size = sizeof(JVDemuxContext), 258 .read_probe = read_probe, 259 .read_header = read_header, 260 .read_packet = read_packet, 261 .read_seek = read_seek, 262 .read_close = read_close, 263}; 264