2 * Bitmap Brothers JV demuxer
3 * Copyright (c) 2005, 2011 Peter Ross <pross@xvid.org>
5 * This file is part of Libav.
7 * Libav 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.
12 * Libav 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.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with Libav; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
24 * Bitmap Brothers JV demuxer
25 * @author Peter Ross <pross@xvid.org>
28 #include "libavutil/intreadwrite.h"
32 #define JV_PREAMBLE_SIZE 5
35 int audio_size; /** audio packet size (bytes) */
36 int video_size; /** video packet size (bytes) */
37 int palette_size; /** palette size (bytes) */
38 int video_type; /** per-frame video compression type */
51 #define MAGIC " Compression by John M Phillips Copyright (C) 1995 The Bitmap Brothers Ltd."
53 static int read_probe(AVProbeData *pd)
55 if (pd->buf[0] == 'J' && pd->buf[1] == 'V' &&
56 !memcmp(pd->buf + 4, MAGIC, FFMIN(strlen(MAGIC), pd->buf_size - 4)))
57 return AVPROBE_SCORE_MAX;
61 static int read_header(AVFormatContext *s)
63 JVDemuxContext *jv = s->priv_data;
64 AVIOContext *pb = s->pb;
66 int64_t audio_pts = 0;
72 ast = avformat_new_stream(s, NULL);
73 vst = avformat_new_stream(s, NULL);
75 return AVERROR(ENOMEM);
77 vst->codec->codec_type = AVMEDIA_TYPE_VIDEO;
78 vst->codec->codec_id = CODEC_ID_JV;
79 vst->codec->codec_tag = 0; /* no fourcc */
80 vst->codec->width = avio_rl16(pb);
81 vst->codec->height = avio_rl16(pb);
84 ast->nb_index_entries = avio_rl16(pb);
85 avpriv_set_pts_info(vst, 64, avio_rl16(pb), 1000);
89 ast->codec->codec_type = AVMEDIA_TYPE_AUDIO;
90 ast->codec->codec_id = CODEC_ID_PCM_U8;
91 ast->codec->codec_tag = 0; /* no fourcc */
92 ast->codec->sample_rate = avio_rl16(pb);
93 ast->codec->channels = 1;
94 avpriv_set_pts_info(ast, 64, 1, ast->codec->sample_rate);
98 ast->index_entries = av_malloc(ast->nb_index_entries * sizeof(*ast->index_entries));
99 if (!ast->index_entries)
100 return AVERROR(ENOMEM);
102 jv->frames = av_malloc(ast->nb_index_entries * sizeof(JVFrame));
104 return AVERROR(ENOMEM);
106 offset = 0x68 + ast->nb_index_entries * 16;
107 for(i = 0; i < ast->nb_index_entries; i++) {
108 AVIndexEntry *e = ast->index_entries + i;
109 JVFrame *jvf = jv->frames + i;
111 /* total frame size including audio, video, palette data and padding */
112 e->size = avio_rl32(pb);
117 jvf->audio_size = avio_rl32(pb);
118 jvf->video_size = avio_rl32(pb);
119 jvf->palette_size = avio_r8(pb) ? 768 : 0;
120 jvf->video_size = FFMIN(FFMAX(jvf->video_size, 0),
121 INT_MAX - JV_PREAMBLE_SIZE - jvf->palette_size);
123 av_log(s, AV_LOG_WARNING, "unsupported audio codec\n");
124 jvf->video_type = avio_r8(pb);
127 e->timestamp = jvf->audio_size ? audio_pts : AV_NOPTS_VALUE;
128 audio_pts += jvf->audio_size;
130 e->flags = jvf->video_type != 1 ? AVINDEX_KEYFRAME : 0;
133 jv->state = JV_AUDIO;
137 static int read_packet(AVFormatContext *s, AVPacket *pkt)
139 JVDemuxContext *jv = s->priv_data;
140 AVIOContext *pb = s->pb;
141 AVStream *ast = s->streams[0];
143 while (!s->pb->eof_reached && jv->pts < ast->nb_index_entries) {
144 const AVIndexEntry *e = ast->index_entries + jv->pts;
145 const JVFrame *jvf = jv->frames + jv->pts;
150 if (jvf->audio_size ) {
151 if (av_get_packet(s->pb, pkt, jvf->audio_size) < 0)
152 return AVERROR(ENOMEM);
153 pkt->stream_index = 0;
154 pkt->pts = e->timestamp;
155 pkt->flags |= AV_PKT_FLAG_KEY;
160 if (jvf->video_size || jvf->palette_size) {
161 int size = jvf->video_size + jvf->palette_size;
162 if (av_new_packet(pkt, size + JV_PREAMBLE_SIZE))
163 return AVERROR(ENOMEM);
165 AV_WL32(pkt->data, jvf->video_size);
166 pkt->data[4] = jvf->video_type;
167 if (avio_read(pb, pkt->data + JV_PREAMBLE_SIZE, size) < 0)
170 pkt->size = size + JV_PREAMBLE_SIZE;
171 pkt->stream_index = 1;
173 if (jvf->video_type != 1)
174 pkt->flags |= AV_PKT_FLAG_KEY;
178 avio_skip(pb, FFMAX(e->size - jvf->audio_size - jvf->video_size
179 - jvf->palette_size, 0));
180 jv->state = JV_AUDIO;
188 static int read_seek(AVFormatContext *s, int stream_index,
189 int64_t ts, int flags)
191 JVDemuxContext *jv = s->priv_data;
192 AVStream *ast = s->streams[0];
195 if (flags & (AVSEEK_FLAG_BYTE|AVSEEK_FLAG_FRAME))
196 return AVERROR(ENOSYS);
198 switch(stream_index) {
200 i = av_index_search_timestamp(ast, ts, flags);
209 if (i < 0 || i >= ast->nb_index_entries)
211 if (avio_seek(s->pb, ast->index_entries[i].pos, SEEK_SET) < 0)
214 jv->state = JV_AUDIO;
219 AVInputFormat ff_jv_demuxer = {
221 .long_name = NULL_IF_CONFIG_SMALL("Bitmap Brothers JV"),
222 .priv_data_size = sizeof(JVDemuxContext),
223 .read_probe = read_probe,
224 .read_header = read_header,
225 .read_packet = read_packet,
226 .read_seek = read_seek,