Statistics
| Branch: | Revision:

ffmpeg / libavformat / jvdec.c @ 57d63d43

History | View | Annotate | Download (6.63 KB)

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/intreadwrite.h"
29
#include "avformat.h"
30

    
31
#define JV_PREAMBLE_SIZE 5
32

    
33
typedef struct {
34
    int audio_size;    /** audio packet size (bytes) */
35
    int video_size;    /** video packet size (bytes) */
36
    int palette_size;  /** palette size (bytes) */
37
    int video_type;    /** per-frame video compression type */
38
} JVFrame;
39

    
40
typedef struct {
41
    JVFrame *frames;
42
    enum {
43
        JV_AUDIO = 0,
44
        JV_VIDEO,
45
        JV_PADDING
46
    } state;
47
    int64_t pts;
48
} JVDemuxContext;
49

    
50
#define MAGIC " Compression by John M Phillips Copyright (C) 1995 The Bitmap Brothers Ltd."
51

    
52
static int read_probe(AVProbeData *pd)
53
{
54
    if (pd->buf[0] == 'J' && pd->buf[1] == 'V' &&
55
        !memcmp(pd->buf + 4, MAGIC, FFMIN(strlen(MAGIC), pd->buf_size - 4)))
56
        return AVPROBE_SCORE_MAX;
57
    return 0;
58
}
59

    
60
static int read_header(AVFormatContext *s,
61
                       AVFormatParameters *ap)
62
{
63
    JVDemuxContext *jv = s->priv_data;
64
    AVIOContext *pb = s->pb;
65
    AVStream *vst, *ast;
66
    int64_t audio_pts = 0;
67
    int64_t offset;
68
    int i;
69

    
70
    avio_skip(pb, 80);
71

    
72
    ast = av_new_stream(s, 0);
73
    vst = av_new_stream(s, 1);
74
    if (!ast || !vst)
75
        return AVERROR(ENOMEM);
76

    
77
    vst->codec->codec_type  = CODEC_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);
82
    vst->nb_frames          =
83
    ast->nb_index_entries   = avio_rl16(pb);
84
    av_set_pts_info(vst, 64, avio_rl16(pb), 1000);
85

    
86
    avio_skip(pb, 4);
87

    
88
    ast->codec->codec_type  = CODEC_TYPE_AUDIO;
89
    ast->codec->codec_id    = CODEC_ID_PCM_U8;
90
    ast->codec->codec_tag   = 0; /* no fourcc */
91
    ast->codec->sample_rate = avio_rl16(pb);
92
    ast->codec->channels    = 1;
93
    av_set_pts_info(ast, 64, 1, ast->codec->sample_rate);
94

    
95
    avio_skip(pb, 10);
96

    
97
    ast->index_entries = av_malloc(ast->nb_index_entries * sizeof(*ast->index_entries));
98
    if (!ast->index_entries)
99
        return AVERROR(ENOMEM);
100

    
101
    jv->frames = av_malloc(ast->nb_index_entries * sizeof(JVFrame));
102
    if (!jv->frames)
103
        return AVERROR(ENOMEM);
104

    
105
    offset = 0x68 + ast->nb_index_entries * 16;
106
    for(i = 0; i < ast->nb_index_entries; i++) {
107
        AVIndexEntry *e   = ast->index_entries + i;
108
        JVFrame      *jvf = jv->frames + i;
109

    
110
        /* total frame size including audio, video, palette data and padding */
111
        e->size         = avio_rl32(pb);
112
        e->timestamp    = i;
113
        e->pos          = offset;
114
        offset         += e->size;
115

    
116
        jvf->audio_size = avio_rl32(pb);
117
        jvf->video_size = avio_rl32(pb);
118
        jvf->palette_size = avio_r8(pb) ? 768 : 0;
119
        if (avio_r8(pb))
120
             av_log(s, AV_LOG_WARNING, "unsupported audio codec\n");
121
        jvf->video_type = avio_r8(pb);
122
        avio_skip(pb, 1);
123

    
124
        e->timestamp = jvf->audio_size ? audio_pts : AV_NOPTS_VALUE;
125
        audio_pts += jvf->audio_size;
126

    
127
        e->flags = jvf->video_type != 1 ? AVINDEX_KEYFRAME : 0;
128
    }
129

    
130
    jv->state = JV_AUDIO;
131
    return 0;
132
}
133

    
134
static int read_packet(AVFormatContext *s, AVPacket *pkt)
135
{
136
    JVDemuxContext *jv = s->priv_data;
137
    AVIOContext *pb = s->pb;
138
    AVStream *ast = s->streams[0];
139

    
140
    while (!url_feof(s->pb) && jv->pts < ast->nb_index_entries) {
141
        const AVIndexEntry *e   = ast->index_entries + jv->pts;
142
        const JVFrame      *jvf = jv->frames + jv->pts;
143

    
144
        switch(jv->state) {
145
        case JV_AUDIO:
146
            jv->state++;
147
            if (jvf->audio_size ) {
148
                if (av_get_packet(s->pb, pkt, jvf->audio_size) < 0)
149
                    return AVERROR(ENOMEM);
150
                pkt->stream_index = 0;
151
                pkt->pts          = e->timestamp;
152
                pkt->flags       |= PKT_FLAG_KEY;
153
                return 0;
154
            }
155
        case JV_VIDEO:
156
            jv->state++;
157
            if (jvf->video_size || jvf->palette_size) {
158
                int size = jvf->video_size + jvf->palette_size;
159
                if (av_new_packet(pkt, size + JV_PREAMBLE_SIZE))
160
                    return AVERROR(ENOMEM);
161

    
162
                AV_WL32(pkt->data, jvf->video_size);
163
                pkt->data[4]      = jvf->video_type;
164
                if (avio_read(pb, pkt->data + JV_PREAMBLE_SIZE, size) < 0)
165
                    return AVERROR(EIO);
166

    
167
                pkt->size         = size + JV_PREAMBLE_SIZE;
168
                pkt->stream_index = 1;
169
                pkt->pts          = jv->pts;
170
                if (jvf->video_type != 1)
171
                    pkt->flags |= PKT_FLAG_KEY;
172
                return 0;
173
            }
174
        case JV_PADDING:
175
            avio_skip(pb, FFMAX(e->size - jvf->audio_size - jvf->video_size
176
                                        - jvf->palette_size, 0));
177
            jv->state = JV_AUDIO;
178
            jv->pts++;
179
        }
180
    }
181

    
182
    return AVERROR(EIO);
183
}
184

    
185
static int read_seek(AVFormatContext *s, int stream_index,
186
                     int64_t ts, int flags)
187
{
188
    JVDemuxContext *jv = s->priv_data;
189
    AVStream *ast = s->streams[0];
190
    int i;
191

    
192
    if (flags & (AVSEEK_FLAG_BYTE|AVSEEK_FLAG_FRAME))
193
        return AVERROR_NOTSUPP;
194

    
195
    switch(stream_index) {
196
    case 0:
197
        i = av_index_search_timestamp(ast, ts, flags);
198
        break;
199
    case 1:
200
        i = ts;
201
        break;
202
    default:
203
        return 0;
204
    }
205

    
206
    if (i < 0 || i >= ast->nb_index_entries)
207
        return 0;
208

    
209
    jv->state = JV_AUDIO;
210
    jv->pts   = i;
211
    avio_seek(s->pb, ast->index_entries[i].pos, SEEK_SET);
212
    return 0;
213
}
214

    
215
AVInputFormat ff_jv_demuxer = {
216
    .name           = "jv",
217
    .long_name      = NULL_IF_CONFIG_SMALL("Bitmap Brothers JV"),
218
    .priv_data_size = sizeof(JVDemuxContext),
219
    .read_probe     = read_probe,
220
    .read_header    = read_header,
221
    .read_packet    = read_packet,
222
    .read_seek      = read_seek,
223
};