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
|
/*
* AVS demuxer.
* Copyright (c) 2006 Aurelien Jacobs <aurel@gnuage.org>
*
* 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 St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "avformat.h"
#include "voc.h"
typedef struct avs_format {
voc_dec_context_t voc;
AVStream *st_video;
AVStream *st_audio;
int width;
int height;
int bits_per_sample;
int fps;
int nb_frames;
int remaining_frame_size;
int remaining_audio_size;
} avs_format_t;
typedef enum avs_block_type {
AVS_VIDEO = 0x01,
AVS_AUDIO = 0x02,
AVS_PALETTE = 0x03,
AVS_GAME_DATA = 0x04,
} avs_block_type_t;
static int avs_probe(AVProbeData * p)
{
const uint8_t *d;
if (p->buf_size < 2)
return 0;
d = p->buf;
if (d[0] == 'w' && d[1] == 'W' && d[2] == 0x10 && d[3] == 0)
return 50;
return 0;
}
static int avs_read_header(AVFormatContext * s, AVFormatParameters * ap)
{
avs_format_t *avs = s->priv_data;
s->ctx_flags |= AVFMTCTX_NOHEADER;
url_fskip(&s->pb, 4);
avs->width = get_le16(&s->pb);
avs->height = get_le16(&s->pb);
avs->bits_per_sample = get_le16(&s->pb);
avs->fps = get_le16(&s->pb);
avs->nb_frames = get_le32(&s->pb);
avs->remaining_frame_size = 0;
avs->remaining_audio_size = 0;
avs->st_video = avs->st_audio = NULL;
if (avs->width != 318 || avs->height != 198)
av_log(s, AV_LOG_ERROR, "This avs pretend to be %dx%d "
"when the avs format is supposed to be 318x198 only.\n",
avs->width, avs->height);
return 0;
}
static int
avs_read_video_packet(AVFormatContext * s, AVPacket * pkt,
avs_block_type_t type, int sub_type, int size,
uint8_t * palette, int palette_size)
{
avs_format_t *avs = s->priv_data;
int ret;
ret = av_new_packet(pkt, size + palette_size);
if (ret < 0)
return ret;
if (palette_size) {
pkt->data[0] = 0x00;
pkt->data[1] = 0x03;
pkt->data[2] = palette_size & 0xFF;
pkt->data[3] = (palette_size >> 8) & 0xFF;
memcpy(pkt->data + 4, palette, palette_size - 4);
}
pkt->data[palette_size + 0] = sub_type;
pkt->data[palette_size + 1] = type;
pkt->data[palette_size + 2] = size & 0xFF;
pkt->data[palette_size + 3] = (size >> 8) & 0xFF;
ret = get_buffer(&s->pb, pkt->data + palette_size + 4, size - 4) + 4;
if (ret < size) {
av_free_packet(pkt);
return AVERROR_IO;
}
pkt->size = ret + palette_size;
pkt->stream_index = avs->st_video->index;
if (sub_type == 0)
pkt->flags |= PKT_FLAG_KEY;
return 0;
}
static int avs_read_audio_packet(AVFormatContext * s, AVPacket * pkt)
{
avs_format_t *avs = s->priv_data;
int ret, size;
size = url_ftell(&s->pb);
ret = voc_get_packet(s, pkt, avs->st_audio, avs->remaining_audio_size);
size = url_ftell(&s->pb) - size;
avs->remaining_audio_size -= size;
if (ret == AVERROR_IO)
return 0; /* this indicate EOS */
if (ret < 0)
return ret;
pkt->stream_index = avs->st_audio->index;
pkt->flags |= PKT_FLAG_KEY;
return size;
}
static int avs_read_packet(AVFormatContext * s, AVPacket * pkt)
{
avs_format_t *avs = s->priv_data;
int sub_type = 0, size = 0;
avs_block_type_t type = 0;
int palette_size = 0;
uint8_t palette[4 + 3 * 256];
int ret;
if (avs->remaining_audio_size > 0)
if (avs_read_audio_packet(s, pkt) > 0)
return 0;
while (1) {
if (avs->remaining_frame_size <= 0) {
if (!get_le16(&s->pb)) /* found EOF */
return AVERROR_IO;
avs->remaining_frame_size = get_le16(&s->pb) - 4;
}
while (avs->remaining_frame_size > 0) {
sub_type = get_byte(&s->pb);
type = get_byte(&s->pb);
size = get_le16(&s->pb);
avs->remaining_frame_size -= size;
switch (type) {
case AVS_PALETTE:
ret = get_buffer(&s->pb, palette, size - 4);
if (ret < size - 4)
return AVERROR_IO;
palette_size = size;
break;
case AVS_VIDEO:
if (!avs->st_video) {
avs->st_video = av_new_stream(s, AVS_VIDEO);
if (avs->st_video == NULL)
return AVERROR_NOMEM;
avs->st_video->codec->codec_type = CODEC_TYPE_VIDEO;
avs->st_video->codec->codec_id = CODEC_ID_AVS;
avs->st_video->codec->width = avs->width;
avs->st_video->codec->height = avs->height;
avs->st_video->codec->bits_per_sample=avs->bits_per_sample;
avs->st_video->nb_frames = avs->nb_frames;
avs->st_video->codec->time_base = (AVRational) {
1, avs->fps};
}
return avs_read_video_packet(s, pkt, type, sub_type, size,
palette, palette_size);
case AVS_AUDIO:
if (!avs->st_audio) {
avs->st_audio = av_new_stream(s, AVS_AUDIO);
if (avs->st_audio == NULL)
return AVERROR_NOMEM;
avs->st_audio->codec->codec_type = CODEC_TYPE_AUDIO;
}
avs->remaining_audio_size = size - 4;
size = avs_read_audio_packet(s, pkt);
if (size != 0)
return size;
break;
default:
url_fskip(&s->pb, size - 4);
}
}
}
}
static int avs_read_close(AVFormatContext * s)
{
return 0;
}
AVInputFormat avs_demuxer = {
"avs",
"avs format",
sizeof(avs_format_t),
avs_probe,
avs_read_header,
avs_read_packet,
avs_read_close,
};
|
