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comparison pwplib/pvp.c @ 0:acb5694e93d9

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Initial import.
author Matti Hamalainen <ccr@tnsp.org>
date Tue, 18 May 2010 04:25:44 +0300
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-1:000000000000 0:acb5694e93d9
1 /*
2 * PWPlib: PWP Video Phormat
3 *
4 * not very functional yet :)
5 *
6 */
7
8 #include "config.h"
9
10 #ifdef DRIVE_PVP
11
12 #include <stdlib.h>
13 #include <stdio.h>
14 #include <string.h>
15
16 #include "pwplib.h"
17
18 void pvp_calcframe(u8*s,int lgtnew,int flags)
19 {
20
21 static int lgt=0;
22 static u8*prev=NULL;
23
24 TEMPMALL(u8,buf,lgtnew*2),*d=buf;
25
26 int accum=0;
27
28 if(lgtnew!=lgt)
29 {
30 if(prev!=NULL)free(prev);
31 lgt=lgtnew;
32 prev=malloc(lgt*sizeof(u8));
33 flags|=1;
34 }
35
36 if(flags&1)memset(s,0,lgt*sizeof(u8)); /* support other consts as well? */
37
38 {int i=0,skip=0;
39 for(;i<lgt;i++)
40 {
41 if(s[i]!=prev[i])
42 {
43 while(skip>0)
44 {
45 if(skip<128){*d++=128|((skip-1)&127);skip=0;}
46 else {*d++=128|127;skip-=128;}
47 }
48
49 {u8*cntp=d;
50 int gap=0;
51
52 while(gap<2 && i<lgt && (d-cntp<126))
53 {
54 d++;
55 *d=s[i];
56
57 if(s[i]==prev[i])gap++;
58 else gap=0;
59 i++;
60 }
61 d[1]=s[i];
62 d[2]=s[i+1];
63 d+=2-gap;skip+=gap-1;i--;
64 *cntp=(d-cntp-1)&127;
65 }
66 }
67 else skip++;
68 }}
69 memcpy(prev,s,sizeof(u8)*lgt);
70
71 /* header */
72
73 {u8 head[6];
74 head[0]='p';head[1]='V';head[2]='P';
75 if(flags&1)head[3]='R';else head[3]='r';
76 head[4]=(d-buf)&255;
77 head[5]=(d-buf)>>8;
78 write(1,head,6);
79 }
80
81 write(1,buf,d-buf);
82
83 TEMPFREE(buf);
84 }
85
86
87
88 /*
89 pvp (pwp video phormat) stream:
90
91 for each frame:
92 'pVP' signature (used by synch routines etc)
93 u8 frame type
94 u16 frame length, in bytes
95
96 r-frame (lossless rasterdata)
97
98 stored: changes to the previous display frame, rle+huffman compression?
99
100 time delta to the previous frame (in second/256's)
101
102 index=0;
103
104 command
105 - 1xxxxxxx skip 0..127 bytes
106 - 0xxxxxxx 0..127 bytes of data follow
107
108 R-frame (lossless raster keyframe)
109
110 stored as delta to a constant (zero) table
111
112 i/I-frames == like r/R but for ibm char/attribute-pair screendump
113
114 we need some kind of compression for the lossless frames.
115
116 we also need a low-bandwidth lossy compression for longer movies and
117 tv streams.
118
119 g-frame (gsm audio in 8kHz) for moviez
120
121 b-frame (beep audio)
122 (B-frame == update everything? write a B-frame when every channel
123 changes or when above given threshold)
124
125 length of output (in second/256's)
126 chan# (8bit), freq(16bit), vol(8bit), pulsestat(8bit)
127
128 c-frame (commentary)
129
130 first byte==importance level (signed byte, 0==for names, copyrights etc)
131 rest==ascii string
132
133 may also contain things like stupid irclog, subtitles, textual
134 descriptions of the video etc
135
136 */
137
138 void pvp_sound(int ch,int note,int vol,int ratio)
139 {
140
141 }
142
143 void pvp_loopflush()
144 {
145 /*
146 timer_counter();
147 pwplib.player();
148
149 save b-frames
150 */
151 }
152
153 void pvp_dump_rast()
154 {
155 if(pwplib.setup[SETUP_LOSSY])
156 conv_losestuff(pwplib.videobuf.d,
157 pwplib.videobuf.height*pwplib.videobuf.width,1);
158
159 pvp_calcframe(pwplib.videobuf.d,
160 pwplib.videobuf.width*pwplib.videobuf.height,0);
161 }
162
163 void pvp_dump_ibm()
164 {
165 pvp_calcframe(pwplib.videobuf.d,
166 pwplib.videobuf.width*pwplib.videobuf.height*2,0);
167 }
168
169 void pvp_init()
170 {
171 pwplib.videobuf.height=50;
172 pwplib.videobuf.width=80;
173
174 pwplib.dump_attr=&pvp_dump_ibm;
175 pwplib.dump_rast=&pvp_dump_rast;
176 pwplib.sound=pvp_sound;
177 pwplib.loopflush=&pvp_loopflush;
178 }
179
180 #endif