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 JVFrame { 37 int audio_size; /**< audio packet size (bytes) */ 38 int video_size; /**< video packet size (bytes) */ 39 uint16_t palette_size; /**< palette size (bytes) */ 40 uint8_t video_type; /**< per-frame video compression type */ 41} JVFrame; 42 43typedef struct JVDemuxContext { 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(const AVProbeData *pd) 56{ 57 if (pd->buf[0] == 'J' && pd->buf[1] == 'V' && strlen(MAGIC) + 4 <= pd->buf_size && 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 FFStream *asti; 78 int64_t audio_pts = 0; 79 int64_t offset; 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 asti = ffstream(ast); 88 89 vst->codecpar->codec_type = AVMEDIA_TYPE_VIDEO; 90 vst->codecpar->codec_id = AV_CODEC_ID_JV; 91 vst->codecpar->codec_tag = 0; /* no fourcc */ 92 vst->codecpar->width = avio_rl16(pb); 93 vst->codecpar->height = avio_rl16(pb); 94 vst->duration = 95 vst->nb_frames = 96 asti->nb_index_entries = avio_rl16(pb); 97 avpriv_set_pts_info(vst, 64, avio_rl16(pb), 1000); 98 99 avio_skip(pb, 4); 100 101 ast->codecpar->codec_type = AVMEDIA_TYPE_AUDIO; 102 ast->codecpar->codec_id = AV_CODEC_ID_PCM_U8; 103 ast->codecpar->codec_tag = 0; /* no fourcc */ 104 ast->codecpar->sample_rate = avio_rl16(pb); 105 ast->codecpar->ch_layout = (AVChannelLayout)AV_CHANNEL_LAYOUT_MONO; 106 avpriv_set_pts_info(ast, 64, 1, ast->codecpar->sample_rate); 107 108 avio_skip(pb, 10); 109 110 asti->index_entries = av_malloc(asti->nb_index_entries * 111 sizeof(*asti->index_entries)); 112 if (!asti->index_entries) 113 return AVERROR(ENOMEM); 114 115 jv->frames = av_malloc(asti->nb_index_entries * sizeof(*jv->frames)); 116 if (!jv->frames) 117 return AVERROR(ENOMEM); 118 offset = 0x68 + asti->nb_index_entries * 16; 119 for (int i = 0; i < asti->nb_index_entries; i++) { 120 AVIndexEntry *e = asti->index_entries + i; 121 JVFrame *jvf = jv->frames + i; 122 123 /* total frame size including audio, video, palette data and padding */ 124 e->size = avio_rl32(pb); 125 e->timestamp = i; 126 e->pos = offset; 127 offset += e->size; 128 129 jvf->audio_size = avio_rl32(pb); 130 jvf->video_size = avio_rl32(pb); 131 jvf->palette_size = avio_r8(pb) ? 768 : 0; 132 133 if ((jvf->video_size | jvf->audio_size) & ~0xFFFFFF || 134 e->size - jvf->audio_size 135 - jvf->video_size 136 - jvf->palette_size < 0) { 137 if (s->error_recognition & AV_EF_EXPLODE) 138 return AVERROR_INVALIDDATA; 139 jvf->audio_size = 140 jvf->video_size = 141 jvf->palette_size = 0; 142 } 143 144 if (avio_r8(pb)) 145 av_log(s, AV_LOG_WARNING, "unsupported audio codec\n"); 146 147 jvf->video_type = avio_r8(pb); 148 avio_skip(pb, 1); 149 150 e->timestamp = jvf->audio_size ? audio_pts : AV_NOPTS_VALUE; 151 audio_pts += jvf->audio_size; 152 153 e->flags = jvf->video_type != 1 ? AVINDEX_KEYFRAME : 0; 154 } 155 156 jv->state = JV_AUDIO; 157 return 0; 158} 159 160static int read_packet(AVFormatContext *s, AVPacket *pkt) 161{ 162 JVDemuxContext *jv = s->priv_data; 163 AVIOContext *pb = s->pb; 164 AVStream *ast = s->streams[0]; 165 FFStream *const asti = ffstream(ast); 166 int ret; 167 168 while (!avio_feof(s->pb) && jv->pts < asti->nb_index_entries) { 169 const AVIndexEntry *const e = asti->index_entries + jv->pts; 170 const JVFrame *jvf = jv->frames + jv->pts; 171 172 switch (jv->state) { 173 case JV_AUDIO: 174 jv->state++; 175 if (jvf->audio_size) { 176 if ((ret = av_get_packet(s->pb, pkt, jvf->audio_size)) < 0) 177 return ret; 178 pkt->stream_index = 0; 179 pkt->pts = e->timestamp; 180 pkt->flags |= AV_PKT_FLAG_KEY; 181 return 0; 182 } 183 case JV_VIDEO: 184 jv->state++; 185 if (jvf->video_size || jvf->palette_size) { 186 int size = jvf->video_size + jvf->palette_size; 187 if ((ret = av_new_packet(pkt, size + JV_PREAMBLE_SIZE)) < 0) 188 return ret; 189 190 AV_WL32(pkt->data, jvf->video_size); 191 pkt->data[4] = jvf->video_type; 192 ret = avio_read(pb, pkt->data + JV_PREAMBLE_SIZE, size); 193 if (ret < 0) 194 return ret; 195 if (ret < size) { 196 memset(pkt->data + JV_PREAMBLE_SIZE + ret, 0, 197 AV_INPUT_BUFFER_PADDING_SIZE); 198 pkt->flags |= AV_PKT_FLAG_CORRUPT; 199 } 200 pkt->size = ret + JV_PREAMBLE_SIZE; 201 pkt->stream_index = 1; 202 pkt->pts = jv->pts; 203 if (jvf->video_type != 1) 204 pkt->flags |= AV_PKT_FLAG_KEY; 205 return 0; 206 } 207 case JV_PADDING: 208 avio_skip(pb, FFMAX(e->size - jvf->audio_size - jvf->video_size 209 - jvf->palette_size, 0)); 210 jv->state = JV_AUDIO; 211 jv->pts++; 212 } 213 } 214 215 if (s->pb->eof_reached) 216 return AVERROR_EOF; 217 218 return AVERROR(EIO); 219} 220 221static int read_seek(AVFormatContext *s, int stream_index, 222 int64_t ts, int flags) 223{ 224 JVDemuxContext *jv = s->priv_data; 225 AVStream *ast = s->streams[0]; 226 FFStream *const asti = ffstream(ast); 227 int i; 228 229 if (flags & (AVSEEK_FLAG_BYTE | AVSEEK_FLAG_FRAME)) 230 return AVERROR(ENOSYS); 231 232 switch (stream_index) { 233 case 0: 234 i = av_index_search_timestamp(ast, ts, flags); 235 break; 236 case 1: 237 i = ts; 238 break; 239 default: 240 return 0; 241 } 242 243 if (i < 0 || i >= asti->nb_index_entries) 244 return 0; 245 if (avio_seek(s->pb, asti->index_entries[i].pos, SEEK_SET) < 0) 246 return -1; 247 248 jv->state = JV_AUDIO; 249 jv->pts = i; 250 return 0; 251} 252 253const AVInputFormat ff_jv_demuxer = { 254 .name = "jv", 255 .long_name = NULL_IF_CONFIG_SMALL("Bitmap Brothers JV"), 256 .priv_data_size = sizeof(JVDemuxContext), 257 .flags_internal = FF_FMT_INIT_CLEANUP, 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