| 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 | |
| 36 | typedef 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 | |
| 43 | typedef 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 | |
| 55 | static 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 | |
| 63 | static int read_close(AVFormatContext *s) |
| 64 | { |
| 65 | JVDemuxContext *jv = s->priv_data; |
| 66 | |
| 67 | av_freep(&jv->frames); |
| 68 | |
| 69 | return 0; |
| 70 | } |
| 71 | |
| 72 | static 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 | |
| 163 | static 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 (!avio_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 | |
| 223 | static 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 | |
| 254 | AVInputFormat 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 | }; |