Newer
Older
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
/*
* YUV4MPEG format
* Copyright (c) 2001, 2002, 2003 Fabrice Bellard.
*
* This library 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 of the License, or (at your option) any later version.
*
* This library 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 this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "avformat.h"
#define Y4M_MAGIC "YUV4MPEG2"
#define Y4M_FRAME_MAGIC "FRAME"
#define Y4M_LINE_MAX 256
static int yuv4_write_header(AVFormatContext *s)
{
AVStream *st;
int width, height;
int raten, rated, aspectn, aspectd, fps, fps1, n;
char buf[Y4M_LINE_MAX+1];
if (s->nb_streams != 1)
return -EIO;
st = s->streams[0];
width = st->codec.width;
height = st->codec.height;
fps = st->codec.frame_rate;
fps1 = (((float)fps / FRAME_RATE_BASE) * 1000);
/* Sorry about this messy code, but mpeg2enc is very picky about
* the framerates it accepts. */
switch(fps1) {
case 23976:
raten = 24000; /* turn the framerate into a ratio */
rated = 1001;
break;
case 29970:
raten = 30000;
rated = 1001;
break;
case 25000:
raten = 25;
rated = 1;
break;
case 30000:
raten = 30;
rated = 1;
break;
case 24000:
raten = 24;
rated = 1;
break;
case 50000:
raten = 50;
rated = 1;
break;
case 59940:
raten = 60000;
rated = 1001;
break;
case 60000:
raten = 60;
rated = 1;
break;
default:
raten = fps1; /* this setting should work, but often doesn't */
rated = 1000;
break;
}
aspectn = 1;
aspectd = 1; /* ffmpeg always uses a 1:1 aspect ratio */
/* construct stream header, if this is the first frame */
n = snprintf(buf, sizeof(buf), "%s W%d H%d F%d:%d I%s A%d:%d\n",
Y4M_MAGIC,
width,
height,
raten, rated,
"p", /* ffmpeg seems to only output progressive video */
aspectn, aspectd);
if (n < 0) {
fprintf(stderr, "Error. YUV4MPEG stream header write failed.\n");
return -EIO;
} else {
put_buffer(&s->pb, buf, strlen(buf));
}
return 0;
}
static int yuv4_write_packet(AVFormatContext *s, int stream_index,
UINT8 *buf, int size, int force_pts)
{
AVStream *st = s->streams[stream_index];
ByteIOContext *pb = &s->pb;
AVPicture *picture;
int width, height;
int i, m;
char buf1[20];
UINT8 *ptr, *ptr1, *ptr2;
picture = (AVPicture *)buf;
/* construct frame header */
m = snprintf(buf1, sizeof(buf1), "%s \n", Y4M_FRAME_MAGIC);
put_buffer(pb, buf1, strlen(buf1));
width = st->codec.width;
height = st->codec.height;
ptr = picture->data[0];
for(i=0;i<height;i++) {
put_buffer(pb, ptr, width);
ptr += picture->linesize[0];
}
height >>= 1;
width >>= 1;
ptr1 = picture->data[1];
ptr2 = picture->data[2];
for(i=0;i<height;i++) { /* Cb */
put_buffer(pb, ptr1, width);
ptr1 += picture->linesize[1];
}
for(i=0;i<height;i++) { /* Cr */
put_buffer(pb, ptr2, width);
ptr2 += picture->linesize[2];
}
put_flush_packet(pb);
return 0;
}
static int yuv4_write_trailer(AVFormatContext *s)
{
return 0;
}
AVOutputFormat yuv4mpegpipe_oformat = {
"yuv4mpegpipe",
"YUV4MPEG pipe format",
"",
"yuv4mpeg",
0,
CODEC_ID_NONE,
CODEC_ID_RAWVIDEO,
yuv4_write_header,
yuv4_write_packet,
yuv4_write_trailer,
.flags = AVFMT_RAWPICTURE,
};