2 * Bitmap Brothers JV demuxer
3 * Copyright (c) 2005, 2011 Peter Ross <pross@xvid.org>
5 * This file is part of FFmpeg.
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.
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.
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
24 * Bitmap Brothers JV demuxer
25 * @author Peter Ross <pross@xvid.org>
28 #include "libavutil/channel_layout.h"
29 #include "libavutil/intreadwrite.h"
34 #define JV_PREAMBLE_SIZE 5
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 */
53 #define MAGIC " Compression by John M Phillips Copyright (C) 1995 The Bitmap Brothers Ltd."
55 static int read_probe(AVProbeData *pd)
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;
63 static int read_close(AVFormatContext *s)
65 JVDemuxContext *jv = s->priv_data;
67 av_freep(&jv->frames);
72 static int read_header(AVFormatContext *s)
74 JVDemuxContext *jv = s->priv_data;
75 AVIOContext *pb = s->pb;
77 int64_t audio_pts = 0;
83 ast = avformat_new_stream(s, NULL);
84 vst = avformat_new_stream(s, NULL);
86 return AVERROR(ENOMEM);
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);
95 ast->nb_index_entries = avio_rl16(pb);
96 avpriv_set_pts_info(vst, 64, avio_rl16(pb), 1000);
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);
110 ast->index_entries = av_malloc(ast->nb_index_entries *
111 sizeof(*ast->index_entries));
112 if (!ast->index_entries)
113 return AVERROR(ENOMEM);
115 jv->frames = av_malloc(ast->nb_index_entries * sizeof(JVFrame));
117 return AVERROR(ENOMEM);
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;
124 /* total frame size including audio, video, palette data and padding */
125 e->size = avio_rl32(pb);
130 jvf->audio_size = avio_rl32(pb);
131 jvf->video_size = avio_rl32(pb);
132 jvf->palette_size = avio_r8(pb) ? 768 : 0;
134 if ((jvf->video_size | jvf->audio_size) & ~0xFFFFFF ||
135 e->size - jvf->audio_size
137 - jvf->palette_size < 0) {
138 if (s->error_recognition & AV_EF_EXPLODE) {
140 return AVERROR_INVALIDDATA;
144 jvf->palette_size = 0;
148 av_log(s, AV_LOG_WARNING, "unsupported audio codec\n");
150 jvf->video_type = avio_r8(pb);
153 e->timestamp = jvf->audio_size ? audio_pts : AV_NOPTS_VALUE;
154 audio_pts += jvf->audio_size;
156 e->flags = jvf->video_type != 1 ? AVINDEX_KEYFRAME : 0;
159 jv->state = JV_AUDIO;
163 static int read_packet(AVFormatContext *s, AVPacket *pkt)
165 JVDemuxContext *jv = s->priv_data;
166 AVIOContext *pb = s->pb;
167 AVStream *ast = s->streams[0];
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;
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;
186 if (jvf->video_size || jvf->palette_size) {
188 int size = jvf->video_size + jvf->palette_size;
189 if (av_new_packet(pkt, size + JV_PREAMBLE_SIZE))
190 return AVERROR(ENOMEM);
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);
198 memset(pkt->data + JV_PREAMBLE_SIZE + ret, 0,
199 FF_INPUT_BUFFER_PADDING_SIZE);
200 pkt->flags |= AV_PKT_FLAG_CORRUPT;
202 pkt->size = ret + JV_PREAMBLE_SIZE;
203 pkt->stream_index = 1;
205 if (jvf->video_type != 1)
206 pkt->flags |= AV_PKT_FLAG_KEY;
210 avio_skip(pb, FFMAX(e->size - jvf->audio_size - jvf->video_size
211 - jvf->palette_size, 0));
212 jv->state = JV_AUDIO;
217 if (s->pb->eof_reached)
223 static int read_seek(AVFormatContext *s, int stream_index,
224 int64_t ts, int flags)
226 JVDemuxContext *jv = s->priv_data;
227 AVStream *ast = s->streams[0];
230 if (flags & (AVSEEK_FLAG_BYTE | AVSEEK_FLAG_FRAME))
231 return AVERROR(ENOSYS);
233 switch (stream_index) {
235 i = av_index_search_timestamp(ast, ts, flags);
244 if (i < 0 || i >= ast->nb_index_entries)
246 if (avio_seek(s->pb, ast->index_entries[i].pos, SEEK_SET) < 0)
249 jv->state = JV_AUDIO;
254 AVInputFormat ff_jv_demuxer = {
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,