| @@ -0,0 +1,109 @@ |
| 1 | +#include <u.h> |
| 2 | +#include <libc.h> |
| 3 | +#include <bio.h> |
| 4 | + |
| 5 | +static int |
| 6 | +Bu16le(Biobuf *b, u16int *o) |
| 7 | +{ |
| 8 | + int x; |
| 9 | + |
| 10 | + x = Bgetc(b); |
| 11 | + x |= Bgetc(b)<<8; |
| 12 | + *o = x; |
| 13 | + if(x < 0) |
| 14 | + werrstr("failed to read 2 bytes"); |
| 15 | + |
| 16 | + return x < 0 ? -1 : 0; |
| 17 | +} |
| 18 | + |
| 19 | +static int |
| 20 | +Bu32le(Biobuf *b, u32int *o) |
| 21 | +{ |
| 22 | + int x, i; |
| 23 | + |
| 24 | + *o = 0; |
| 25 | + for(i = 0; i < 4; *o |= x<<(i*8), i++){ |
| 26 | + if((x = Bgetc(b)) < 0){ |
| 27 | + werrstr("failed to read 4 bytes"); |
| 28 | + return -1; |
| 29 | + } |
| 30 | + } |
| 31 | + |
| 32 | + return 0; |
| 33 | +} |
| 34 | + |
| 35 | +static int |
| 36 | +Bu64le(Biobuf *b, u64int *o) |
| 37 | +{ |
| 38 | + int x, i; |
| 39 | + |
| 40 | + *o = 0; |
| 41 | + for(i = 0; i < 8; *o |= x<<(i*8), i++){ |
| 42 | + if((x = Bgetc(b)) < 0){ |
| 43 | + werrstr("failed to read 8 bytes"); |
| 44 | + return -1; |
| 45 | + } |
| 46 | + } |
| 47 | + |
| 48 | + return 0; |
| 49 | +} |
| 50 | + |
| 51 | +static void |
| 52 | +usage(void) |
| 53 | +{ |
| 54 | + fprint(2, "usage: %s <file.ivf >file.raw\n", argv0); |
| 55 | + exits("usage"); |
| 56 | +} |
| 57 | + |
| 58 | +void |
| 59 | +main(int argc, char **argv) |
| 60 | +{ |
| 61 | + int n, bufsz, framenum; |
| 62 | + u32int tbnum, tbdenum; |
| 63 | + u16int w, h, hlen; |
| 64 | + u64int timestamp; |
| 65 | + Biobuf in, out; |
| 66 | + char tmp[6]; |
| 67 | + u8int *buf; |
| 68 | + u32int sz; |
| 69 | + |
| 70 | + ARGBEGIN{ |
| 71 | + }ARGEND |
| 72 | + |
| 73 | + if(argc != 0) |
| 74 | + usage(); |
| 75 | + |
| 76 | + Binit(&in, 0, OREAD); |
| 77 | + Binit(&out, 1, OWRITE); |
| 78 | + |
| 79 | + if(Bread(&in, tmp, 6) != 6 || Bu16le(&in, &hlen) < 0) |
| 80 | + sysfatal("header read failed"); |
| 81 | + if(memcmp(tmp, "DKIF", 4) != 0) |
| 82 | + sysfatal("expected DKIF, got %02x%02x%02x%02x", tmp[0], tmp[1], tmp[2], tmp[3]); |
| 83 | + if(hlen < 0x20 || Bread(&in, tmp, 4) != 4) |
| 84 | + sysfatal("invalid header: hlen=%d", hlen); |
| 85 | + if(Bu16le(&in, &w) < 0 || Bu16le(&in, &h) < 0 || Bu32le(&in, &tbdenum) < 0 || Bu32le(&in, &tbnum) < 0) |
| 86 | + sysfatal("invalid header: %r"); |
| 87 | + if(Bseek(&in, hlen, 0) != hlen) |
| 88 | + sysfatal("invalid IVF stream"); |
| 89 | + |
| 90 | + bufsz = 0; |
| 91 | + buf = nil; |
| 92 | + for(framenum = 0;; framenum++){ |
| 93 | + if(Bu32le(&in, &sz) < 0 || Bu64le(&in, ×tamp) || (int)sz < 0) |
| 94 | + break; |
| 95 | + if(bufsz < sz){ |
| 96 | + bufsz = sz; |
| 97 | + if((buf = realloc(buf, bufsz)) == nil) |
| 98 | + sysfatal("frame %d is too big: %d bytes", framenum, bufsz); |
| 99 | + } |
| 100 | + if((n = Bread(&in, buf, sz)) != sz) |
| 101 | + sysfatal("short read (%d < %d)", n, sz); |
| 102 | + Bwrite(&out, buf, sz); |
| 103 | + } |
| 104 | + |
| 105 | + Bterm(&in); |
| 106 | + Bterm(&out); |
| 107 | + |
| 108 | + exits(nil); |
| 109 | +} |