1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
|
/*
* Delphine Software International CIN File Demuxer
* Copyright (c) 2006 Gregory Montoir (cyx@users.sourceforge.net)
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* @file
* Delphine Software International CIN file demuxer
*/
#include "libavutil/intreadwrite.h"
#include "avformat.h"
#include "internal.h"
#include "avio_internal.h"
typedef struct CinFileHeader {
int video_frame_size;
int video_frame_width;
int video_frame_height;
int audio_frequency;
int audio_bits;
int audio_stereo;
int audio_frame_size;
} CinFileHeader;
typedef struct CinFrameHeader {
int audio_frame_type;
int video_frame_type;
int pal_colors_count;
int audio_frame_size;
int video_frame_size;
} CinFrameHeader;
typedef struct CinDemuxContext {
int audio_stream_index;
int video_stream_index;
CinFileHeader file_header;
int64_t audio_stream_pts;
int64_t video_stream_pts;
CinFrameHeader frame_header;
int audio_buffer_size;
} CinDemuxContext;
static int cin_probe(AVProbeData *p)
{
/* header starts with this special marker */
if (AV_RL32(&p->buf[0]) != 0x55AA0000)
return 0;
/* for accuracy, check some header field values */
if (AV_RL32(&p->buf[12]) != 22050 || p->buf[16] != 16 || p->buf[17] != 0)
return 0;
return AVPROBE_SCORE_MAX;
}
static int cin_read_file_header(CinDemuxContext *cin, AVIOContext *pb) {
CinFileHeader *hdr = &cin->file_header;
if (avio_rl32(pb) != 0x55AA0000)
return AVERROR_INVALIDDATA;
hdr->video_frame_size = avio_rl32(pb);
hdr->video_frame_width = avio_rl16(pb);
hdr->video_frame_height = avio_rl16(pb);
hdr->audio_frequency = avio_rl32(pb);
hdr->audio_bits = avio_r8(pb);
hdr->audio_stereo = avio_r8(pb);
hdr->audio_frame_size = avio_rl16(pb);
if (hdr->audio_frequency != 22050 || hdr->audio_bits != 16 || hdr->audio_stereo != 0)
return AVERROR_INVALIDDATA;
return 0;
}
static int cin_read_header(AVFormatContext *s)
{
int rc;
CinDemuxContext *cin = s->priv_data;
CinFileHeader *hdr = &cin->file_header;
AVIOContext *pb = s->pb;
AVStream *st;
rc = cin_read_file_header(cin, pb);
if (rc)
return rc;
cin->video_stream_pts = 0;
cin->audio_stream_pts = 0;
cin->audio_buffer_size = 0;
/* initialize the video decoder stream */
st = avformat_new_stream(s, NULL);
if (!st)
return AVERROR(ENOMEM);
avpriv_set_pts_info(st, 32, 1, 12);
cin->video_stream_index = st->index;
st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
st->codec->codec_id = CODEC_ID_DSICINVIDEO;
st->codec->codec_tag = 0; /* no fourcc */
st->codec->width = hdr->video_frame_width;
st->codec->height = hdr->video_frame_height;
/* initialize the audio decoder stream */
st = avformat_new_stream(s, NULL);
if (!st)
return AVERROR(ENOMEM);
avpriv_set_pts_info(st, 32, 1, 22050);
cin->audio_stream_index = st->index;
st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
st->codec->codec_id = CODEC_ID_DSICINAUDIO;
st->codec->codec_tag = 0; /* no tag */
st->codec->channels = 1;
st->codec->sample_rate = 22050;
st->codec->bits_per_coded_sample = 8;
st->codec->bit_rate = st->codec->sample_rate * st->codec->bits_per_coded_sample * st->codec->channels;
return 0;
}
static int cin_read_frame_header(CinDemuxContext *cin, AVIOContext *pb) {
CinFrameHeader *hdr = &cin->frame_header;
hdr->video_frame_type = avio_r8(pb);
hdr->audio_frame_type = avio_r8(pb);
hdr->pal_colors_count = avio_rl16(pb);
hdr->video_frame_size = avio_rl32(pb);
hdr->audio_frame_size = avio_rl32(pb);
if (url_feof(pb) || pb->error)
return AVERROR(EIO);
if (avio_rl32(pb) != 0xAA55AA55)
return AVERROR_INVALIDDATA;
return 0;
}
static int cin_read_packet(AVFormatContext *s, AVPacket *pkt)
{
CinDemuxContext *cin = s->priv_data;
AVIOContext *pb = s->pb;
CinFrameHeader *hdr = &cin->frame_header;
int rc, palette_type, pkt_size;
int ret;
if (cin->audio_buffer_size == 0) {
rc = cin_read_frame_header(cin, pb);
if (rc)
return rc;
if ((int16_t)hdr->pal_colors_count < 0) {
hdr->pal_colors_count = -(int16_t)hdr->pal_colors_count;
palette_type = 1;
} else {
palette_type = 0;
}
/* palette and video packet */
pkt_size = (palette_type + 3) * hdr->pal_colors_count + hdr->video_frame_size;
pkt_size = ffio_limit(pb, pkt_size);
ret = av_new_packet(pkt, 4 + pkt_size);
if (ret < 0)
return ret;
pkt->stream_index = cin->video_stream_index;
pkt->pts = cin->video_stream_pts++;
pkt->data[0] = palette_type;
pkt->data[1] = hdr->pal_colors_count & 0xFF;
pkt->data[2] = hdr->pal_colors_count >> 8;
pkt->data[3] = hdr->video_frame_type;
ret = avio_read(pb, &pkt->data[4], pkt_size);
if (ret < 0) {
av_free_packet(pkt);
return ret;
}
if (ret < pkt_size)
av_shrink_packet(pkt, 4 + ret);
/* sound buffer will be processed on next read_packet() call */
cin->audio_buffer_size = hdr->audio_frame_size;
return 0;
}
/* audio packet */
ret = av_get_packet(pb, pkt, cin->audio_buffer_size);
if (ret < 0)
return ret;
pkt->stream_index = cin->audio_stream_index;
pkt->pts = cin->audio_stream_pts;
pkt->duration = cin->audio_buffer_size - (pkt->pts == 0);
cin->audio_stream_pts += pkt->duration;
cin->audio_buffer_size = 0;
return 0;
}
AVInputFormat ff_dsicin_demuxer = {
.name = "dsicin",
.long_name = NULL_IF_CONFIG_SMALL("Delphine Software International CIN"),
.priv_data_size = sizeof(CinDemuxContext),
.read_probe = cin_probe,
.read_header = cin_read_header,
.read_packet = cin_read_packet,
};
|
