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
231
232
233
234
|
// Y4M file parser by Rik Snel (using yuv4mpeg*.[ch] from
// mjpeg.sourceforge.net) (derived from demux_viv.c)
// older YUV4MPEG (used by xawtv) support by Alex Beregszaszi
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h> /* strtok */
#include "config.h"
#include "mp_msg.h"
#include "help_mp.h"
#include "yuv4mpeg.h"
//#include "stream.h"
#include "demuxer.h"
#include "stheader.h"
#include "bswap.h"
typedef struct {
int framenum;
y4m_stream_info_t* si;
int is_older;
} y4m_priv_t;
int y4m_check_file(demuxer_t* demuxer){
int orig_pos = stream_tell(demuxer->stream);
char buf[10];
y4m_priv_t* priv;
mp_msg(MSGT_DEMUX, MSGL_V, "Checking for YUV4MPEG2\n");
stream_read(demuxer->stream, buf, 9);
buf[9] = 0;
if (strncmp("YUV4MPEG2", buf, 9) && strncmp("YUV4MPEG ", buf, 9)) {
mp_msg(MSGT_DEMUX, MSGL_DBG2, "Failed: YUV4MPEG2\n");
return 0;
}
demuxer->priv = malloc(sizeof(y4m_priv_t));
priv = demuxer->priv;
priv->is_older = 0;
if (!strncmp("YUV4MPEG ", buf, 9))
{
mp_msg(MSGT_DEMUX, MSGL_V, "Found older YUV4MPEG format (used by xawtv)\n");
priv->is_older = 1;
}
mp_msg(MSGT_DEMUX,MSGL_DBG2,"Success: YUV4MPEG2\n");
stream_seek(demuxer->stream, orig_pos);
return 1;
}
// return value:
// 0 = EOF or no stream found
// 1 = successfully read a packet
int demux_y4m_fill_buffer(demuxer_t *demux) {
demux_stream_t *ds=demux->video;
demux_packet_t *dp;
y4m_priv_t *priv=demux->priv;
y4m_frame_info_t fi;
unsigned char *buf[3];
int err, size;
demux->filepos=stream_tell(demux->stream);
size = ((sh_video_t*)ds->sh)->disp_w*((sh_video_t*)ds->sh)->disp_h;
dp = new_demux_packet(3*size/2);
/* swap U and V components */
buf[0] = dp->buffer;
buf[1] = dp->buffer + 5*size/4;
buf[2] = dp->buffer + size;
if (priv->is_older)
{
int c;
c = stream_read_char(demux->stream); /* F */
if (c == -256)
return 0; /* EOF */
if (c != 'F')
{
printf("Bad frame at %p\n", stream_tell(demux->stream)-1);
return 0;
}
stream_skip(demux->stream, 5); /* RAME\n */
stream_read(demux->stream, buf[0], size);
stream_read(demux->stream, buf[1], size/4);
stream_read(demux->stream, buf[2], size/4);
}
else
{
if ((err=y4m_read_frame(demux->stream, priv->si, &fi, buf)) != Y4M_OK) {
mp_msg(MSGT_DEMUX, MSGL_V, "error reading frame %s\n", y4m_strerr(err));
return 0;
}
}
/* This seems to be the right way to calculate the presentation time stamp */
dp->pts=(float)priv->framenum/((sh_video_t*)ds->sh)->fps;
priv->framenum++;
dp->pos=demux->filepos;
dp->flags=0;
ds_add_packet(ds, dp);
return 1;
}
void demux_open_y4m(demuxer_t* demuxer){
y4m_priv_t* priv = demuxer->priv;
y4m_ratio_t framerate;
sh_video_t* sh=new_sh_video(demuxer,0);
int err;
priv->framenum = 0;
priv->si = malloc(sizeof(y4m_stream_info_t));
if (priv->is_older)
{
char buf[4];
int frame_rate_code;
priv->framenum = 1;
stream_skip(demuxer->stream, 8); /* YUV4MPEG */
stream_skip(demuxer->stream, 1); /* space */
stream_read(demuxer->stream, (char *)&buf[0], 3);
buf[3] = 0;
sh->disp_w = atoi(buf);
stream_skip(demuxer->stream, 1); /* space */
stream_read(demuxer->stream, (char *)&buf[0], 3);
buf[3] = 0;
sh->disp_h = atoi(buf);
stream_skip(demuxer->stream, 1); /* space */
stream_read(demuxer->stream, (char *)&buf[0], 1);
buf[1] = 0;
frame_rate_code = atoi(buf);
stream_skip(demuxer->stream, 1); /* new-line */
if (!sh->fps)
{
/* values from xawtv */
switch(frame_rate_code)
{
case 1:
sh->fps = 23.976f;
break;
case 2:
sh->fps = 24.0f;
break;
case 3:
sh->fps = 25.0f;
break;
case 4:
sh->fps = 29.97f;
break;
case 5:
sh->fps = 30.0f;
break;
case 6:
sh->fps = 50.0f;
break;
case 7:
sh->fps = 59.94f;
break;
case 8:
sh->fps = 60.0f;
break;
default:
sh->fps = 25.0f;
}
}
sh->frametime = 1.0f/sh->fps;
}
else
{
y4m_init_stream_info(priv->si);
if ((err=y4m_read_stream_header(demuxer->stream, priv->si)) != Y4M_OK)
mp_msg(MSGT_DEMUXER, MSGL_FATAL, "error parsing YUV4MPEG header: %s\n", y4m_strerr(err));
if(!sh->fps) {
framerate = y4m_si_get_framerate(priv->si);
if (framerate.d != 0)
sh->fps=(float)framerate.n/(float)framerate.d;
else
sh->fps=15.0f;
}
sh->frametime=1.0f/sh->fps;
sh->disp_w = y4m_si_get_width(priv->si);
sh->disp_h = y4m_si_get_height(priv->si);
}
sh->format = mmioFOURCC('Y', 'V', '1', '2');
sh->bih=malloc(sizeof(BITMAPINFOHEADER));
memset(sh->bih,0,sizeof(BITMAPINFOHEADER));
sh->bih->biSize=40;
sh->bih->biWidth = sh->disp_w;
sh->bih->biHeight = sh->disp_h;
sh->bih->biPlanes=3;
sh->bih->biBitCount=12;
sh->bih->biCompression=sh->format;
sh->bih->biSizeImage=sh->bih->biWidth*sh->bih->biHeight*3/2; /* YV12 */
demuxer->video->sh=sh;
sh->ds=demuxer->video;
demuxer->video->id=0;
/* disable seeking, lazy */
demuxer->seekable = 0;
printf("YUV4MPEG2 Video stream %d size: display: %dx%d, codec: %ux%u\n",
demuxer->video->id, sh->disp_w, sh->disp_h, sh->bih->biWidth,
sh->bih->biHeight);
}
void demux_close_y4m(demuxer_t *demuxer)
{
y4m_priv_t* priv;
if (!priv->is_older)
y4m_fini_stream_info(((y4m_priv_t*)demuxer->priv)->si);
free(((y4m_priv_t*)demuxer->priv)->si);
free(demuxer->priv);
return;
}
|
