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 {
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
43typedef 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
55static 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
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    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
163static 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 (!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;
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
223static 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
254AVInputFormat 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};
264