vpx.txt

1000010010010000000000100000000111100001100000000001000
122234444444444444444444
00000000
0000000000000000
000000000000000000000000
000000000000000000000000000000000000000000000000


Start code byte 0 0x9d
Start code byte 1 0x01
Start code byte 2 0x2a

42480100f0c0099d012a000a8007050708858588
              [    ]    [  ]
        [    ]      [  ]
[      ]
At the highest level, every compressed frame has three or more pieces. It begins with an uncompressed data
chunk comprising 10 bytes in the case of key frames and 3-bytes for inter frames. This is followed by two or
more blocks of compressed data (called partitions). These compressed data partitions begin and end on byte
boundaries.

frame_tag f(24)
if (key_frame) {
start_code f(24)
horizontal_size_code f(16)
vertical_size_code f(16)
}

unsigned char *c = pbi->Source;
unsigned int tmp;
tmp = (c[2] << 16) | (c[1] << 8) | c[0];
key_frame = tmp & 0x1;
version = (tmp >> 1) & 0x7;
show_frame = (tmp >> 4) & 0x1;
first_part_size = (tmp >> 5) & 0x7FFFF;
16383


9d 01 2a 00 0a 80 07 

05 07 08 85 85 88


unsigned char *c = pbi->Source + 6;
unsigned int tmp;
tmp = (c[1] << 8) | c[0];
width = tmp & 0x3FFF;
horizontal_scale = tmp >> 14;
tmp = (c[3] << 8) | c[2];
height = tmp & 0x3FFF;
vertical_scale = tmp >> 14;

"000a8007050708858588"