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vp8.rs
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vp8.rs
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//! An implementation of the VP8 Video Codec
//!
//! This module contains a partial implementation of the
//! VP8 video format as defined in RFC-6386.
//!
//! It decodes Keyframes only.
//! VP8 is the underpinning of the WebP image format
//!
//! # Related Links
//! * [rfc-6386](http://tools.ietf.org/html/rfc6386) - The VP8 Data Format and Decoding Guide
//! * [VP8.pdf](http://static.googleusercontent.com/media/research.google.com/en//pubs/archive/37073.pdf) - An overview of
//! of the VP8 format
//!
use byteorder_lite::BigEndian;
use byteorder_lite::{LittleEndian, ReadBytesExt};
use std::cmp;
use std::default::Default;
use std::io::Read;
use std::io::{Cursor, ErrorKind};
use crate::decoder::DecodingError;
use super::loop_filter;
use super::transform;
const MAX_SEGMENTS: usize = 4;
const NUM_DCT_TOKENS: usize = 12;
// Prediction modes
const DC_PRED: i8 = 0;
const V_PRED: i8 = 1;
const H_PRED: i8 = 2;
const TM_PRED: i8 = 3;
const B_PRED: i8 = 4;
const B_DC_PRED: i8 = 0;
const B_TM_PRED: i8 = 1;
const B_VE_PRED: i8 = 2;
const B_HE_PRED: i8 = 3;
const B_LD_PRED: i8 = 4;
const B_RD_PRED: i8 = 5;
const B_VR_PRED: i8 = 6;
const B_VL_PRED: i8 = 7;
const B_HD_PRED: i8 = 8;
const B_HU_PRED: i8 = 9;
// Prediction mode enum
#[repr(i8)]
#[derive(Clone, Copy, Debug, PartialEq, Eq, Default)]
enum LumaMode {
/// Predict DC using row above and column to the left.
#[default]
DC = DC_PRED,
/// Predict rows using row above.
V = V_PRED,
/// Predict columns using column to the left.
H = H_PRED,
/// Propagate second differences.
TM = TM_PRED,
/// Each Y subblock is independently predicted.
B = B_PRED,
}
#[repr(i8)]
#[derive(Clone, Copy, Debug, PartialEq, Eq, Default)]
enum ChromaMode {
/// Predict DC using row above and column to the left.
#[default]
DC = DC_PRED,
/// Predict rows using row above.
V = V_PRED,
/// Predict columns using column to the left.
H = H_PRED,
/// Propagate second differences.
TM = TM_PRED,
}
#[repr(i8)]
#[derive(Clone, Copy, Debug, PartialEq, Eq, Default)]
enum IntraMode {
#[default]
DC = B_DC_PRED,
TM = B_TM_PRED,
VE = B_VE_PRED,
HE = B_HE_PRED,
LD = B_LD_PRED,
RD = B_RD_PRED,
VR = B_VR_PRED,
VL = B_VL_PRED,
HD = B_HD_PRED,
HU = B_HU_PRED,
}
type Prob = u8;
static SEGMENT_ID_TREE: [i8; 6] = [2, 4, -0, -1, -2, -3];
// Section 11.2
// Tree for determining the keyframe luma intra prediction modes:
static KEYFRAME_YMODE_TREE: [i8; 8] = [-B_PRED, 2, 4, 6, -DC_PRED, -V_PRED, -H_PRED, -TM_PRED];
// Default probabilities for decoding the keyframe luma modes
static KEYFRAME_YMODE_PROBS: [Prob; 4] = [145, 156, 163, 128];
// Tree for determining the keyframe B_PRED mode:
static KEYFRAME_BPRED_MODE_TREE: [i8; 18] = [
-B_DC_PRED, 2, -B_TM_PRED, 4, -B_VE_PRED, 6, 8, 12, -B_HE_PRED, 10, -B_RD_PRED, -B_VR_PRED,
-B_LD_PRED, 14, -B_VL_PRED, 16, -B_HD_PRED, -B_HU_PRED,
];
// Probabilities for the BPRED_MODE_TREE
static KEYFRAME_BPRED_MODE_PROBS: [[[u8; 9]; 10]; 10] = [
[
[231, 120, 48, 89, 115, 113, 120, 152, 112],
[152, 179, 64, 126, 170, 118, 46, 70, 95],
[175, 69, 143, 80, 85, 82, 72, 155, 103],
[56, 58, 10, 171, 218, 189, 17, 13, 152],
[144, 71, 10, 38, 171, 213, 144, 34, 26],
[114, 26, 17, 163, 44, 195, 21, 10, 173],
[121, 24, 80, 195, 26, 62, 44, 64, 85],
[170, 46, 55, 19, 136, 160, 33, 206, 71],
[63, 20, 8, 114, 114, 208, 12, 9, 226],
[81, 40, 11, 96, 182, 84, 29, 16, 36],
],
[
[134, 183, 89, 137, 98, 101, 106, 165, 148],
[72, 187, 100, 130, 157, 111, 32, 75, 80],
[66, 102, 167, 99, 74, 62, 40, 234, 128],
[41, 53, 9, 178, 241, 141, 26, 8, 107],
[104, 79, 12, 27, 217, 255, 87, 17, 7],
[74, 43, 26, 146, 73, 166, 49, 23, 157],
[65, 38, 105, 160, 51, 52, 31, 115, 128],
[87, 68, 71, 44, 114, 51, 15, 186, 23],
[47, 41, 14, 110, 182, 183, 21, 17, 194],
[66, 45, 25, 102, 197, 189, 23, 18, 22],
],
[
[88, 88, 147, 150, 42, 46, 45, 196, 205],
[43, 97, 183, 117, 85, 38, 35, 179, 61],
[39, 53, 200, 87, 26, 21, 43, 232, 171],
[56, 34, 51, 104, 114, 102, 29, 93, 77],
[107, 54, 32, 26, 51, 1, 81, 43, 31],
[39, 28, 85, 171, 58, 165, 90, 98, 64],
[34, 22, 116, 206, 23, 34, 43, 166, 73],
[68, 25, 106, 22, 64, 171, 36, 225, 114],
[34, 19, 21, 102, 132, 188, 16, 76, 124],
[62, 18, 78, 95, 85, 57, 50, 48, 51],
],
[
[193, 101, 35, 159, 215, 111, 89, 46, 111],
[60, 148, 31, 172, 219, 228, 21, 18, 111],
[112, 113, 77, 85, 179, 255, 38, 120, 114],
[40, 42, 1, 196, 245, 209, 10, 25, 109],
[100, 80, 8, 43, 154, 1, 51, 26, 71],
[88, 43, 29, 140, 166, 213, 37, 43, 154],
[61, 63, 30, 155, 67, 45, 68, 1, 209],
[142, 78, 78, 16, 255, 128, 34, 197, 171],
[41, 40, 5, 102, 211, 183, 4, 1, 221],
[51, 50, 17, 168, 209, 192, 23, 25, 82],
],
[
[125, 98, 42, 88, 104, 85, 117, 175, 82],
[95, 84, 53, 89, 128, 100, 113, 101, 45],
[75, 79, 123, 47, 51, 128, 81, 171, 1],
[57, 17, 5, 71, 102, 57, 53, 41, 49],
[115, 21, 2, 10, 102, 255, 166, 23, 6],
[38, 33, 13, 121, 57, 73, 26, 1, 85],
[41, 10, 67, 138, 77, 110, 90, 47, 114],
[101, 29, 16, 10, 85, 128, 101, 196, 26],
[57, 18, 10, 102, 102, 213, 34, 20, 43],
[117, 20, 15, 36, 163, 128, 68, 1, 26],
],
[
[138, 31, 36, 171, 27, 166, 38, 44, 229],
[67, 87, 58, 169, 82, 115, 26, 59, 179],
[63, 59, 90, 180, 59, 166, 93, 73, 154],
[40, 40, 21, 116, 143, 209, 34, 39, 175],
[57, 46, 22, 24, 128, 1, 54, 17, 37],
[47, 15, 16, 183, 34, 223, 49, 45, 183],
[46, 17, 33, 183, 6, 98, 15, 32, 183],
[65, 32, 73, 115, 28, 128, 23, 128, 205],
[40, 3, 9, 115, 51, 192, 18, 6, 223],
[87, 37, 9, 115, 59, 77, 64, 21, 47],
],
[
[104, 55, 44, 218, 9, 54, 53, 130, 226],
[64, 90, 70, 205, 40, 41, 23, 26, 57],
[54, 57, 112, 184, 5, 41, 38, 166, 213],
[30, 34, 26, 133, 152, 116, 10, 32, 134],
[75, 32, 12, 51, 192, 255, 160, 43, 51],
[39, 19, 53, 221, 26, 114, 32, 73, 255],
[31, 9, 65, 234, 2, 15, 1, 118, 73],
[88, 31, 35, 67, 102, 85, 55, 186, 85],
[56, 21, 23, 111, 59, 205, 45, 37, 192],
[55, 38, 70, 124, 73, 102, 1, 34, 98],
],
[
[102, 61, 71, 37, 34, 53, 31, 243, 192],
[69, 60, 71, 38, 73, 119, 28, 222, 37],
[68, 45, 128, 34, 1, 47, 11, 245, 171],
[62, 17, 19, 70, 146, 85, 55, 62, 70],
[75, 15, 9, 9, 64, 255, 184, 119, 16],
[37, 43, 37, 154, 100, 163, 85, 160, 1],
[63, 9, 92, 136, 28, 64, 32, 201, 85],
[86, 6, 28, 5, 64, 255, 25, 248, 1],
[56, 8, 17, 132, 137, 255, 55, 116, 128],
[58, 15, 20, 82, 135, 57, 26, 121, 40],
],
[
[164, 50, 31, 137, 154, 133, 25, 35, 218],
[51, 103, 44, 131, 131, 123, 31, 6, 158],
[86, 40, 64, 135, 148, 224, 45, 183, 128],
[22, 26, 17, 131, 240, 154, 14, 1, 209],
[83, 12, 13, 54, 192, 255, 68, 47, 28],
[45, 16, 21, 91, 64, 222, 7, 1, 197],
[56, 21, 39, 155, 60, 138, 23, 102, 213],
[85, 26, 85, 85, 128, 128, 32, 146, 171],
[18, 11, 7, 63, 144, 171, 4, 4, 246],
[35, 27, 10, 146, 174, 171, 12, 26, 128],
],
[
[190, 80, 35, 99, 180, 80, 126, 54, 45],
[85, 126, 47, 87, 176, 51, 41, 20, 32],
[101, 75, 128, 139, 118, 146, 116, 128, 85],
[56, 41, 15, 176, 236, 85, 37, 9, 62],
[146, 36, 19, 30, 171, 255, 97, 27, 20],
[71, 30, 17, 119, 118, 255, 17, 18, 138],
[101, 38, 60, 138, 55, 70, 43, 26, 142],
[138, 45, 61, 62, 219, 1, 81, 188, 64],
[32, 41, 20, 117, 151, 142, 20, 21, 163],
[112, 19, 12, 61, 195, 128, 48, 4, 24],
],
];
// Section 11.4 Tree for determining macroblock the chroma mode
static KEYFRAME_UV_MODE_TREE: [i8; 6] = [-DC_PRED, 2, -V_PRED, 4, -H_PRED, -TM_PRED];
// Probabilities for determining macroblock mode
static KEYFRAME_UV_MODE_PROBS: [Prob; 3] = [142, 114, 183];
// Section 13.4
type TokenProbTables = [[[[Prob; NUM_DCT_TOKENS - 1]; 3]; 8]; 4];
// Probabilities that a token's probability will be updated
static COEFF_UPDATE_PROBS: TokenProbTables = [
[
[
[255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255],
[255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255],
[255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255],
],
[
[176, 246, 255, 255, 255, 255, 255, 255, 255, 255, 255],
[223, 241, 252, 255, 255, 255, 255, 255, 255, 255, 255],
[249, 253, 253, 255, 255, 255, 255, 255, 255, 255, 255],
],
[
[255, 244, 252, 255, 255, 255, 255, 255, 255, 255, 255],
[234, 254, 254, 255, 255, 255, 255, 255, 255, 255, 255],
[253, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255],
],
[
[255, 246, 254, 255, 255, 255, 255, 255, 255, 255, 255],
[239, 253, 254, 255, 255, 255, 255, 255, 255, 255, 255],
[254, 255, 254, 255, 255, 255, 255, 255, 255, 255, 255],
],
[
[255, 248, 254, 255, 255, 255, 255, 255, 255, 255, 255],
[251, 255, 254, 255, 255, 255, 255, 255, 255, 255, 255],
[255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255],
],
[
[255, 253, 254, 255, 255, 255, 255, 255, 255, 255, 255],
[251, 254, 254, 255, 255, 255, 255, 255, 255, 255, 255],
[254, 255, 254, 255, 255, 255, 255, 255, 255, 255, 255],
],
[
[255, 254, 253, 255, 254, 255, 255, 255, 255, 255, 255],
[250, 255, 254, 255, 254, 255, 255, 255, 255, 255, 255],
[254, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255],
],
[
[255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255],
[255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255],
[255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255],
],
],
[
[
[217, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255],
[225, 252, 241, 253, 255, 255, 254, 255, 255, 255, 255],
[234, 250, 241, 250, 253, 255, 253, 254, 255, 255, 255],
],
[
[255, 254, 255, 255, 255, 255, 255, 255, 255, 255, 255],
[223, 254, 254, 255, 255, 255, 255, 255, 255, 255, 255],
[238, 253, 254, 254, 255, 255, 255, 255, 255, 255, 255],
],
[
[255, 248, 254, 255, 255, 255, 255, 255, 255, 255, 255],
[249, 254, 255, 255, 255, 255, 255, 255, 255, 255, 255],
[255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255],
],
[
[255, 253, 255, 255, 255, 255, 255, 255, 255, 255, 255],
[247, 254, 255, 255, 255, 255, 255, 255, 255, 255, 255],
[255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255],
],
[
[255, 253, 254, 255, 255, 255, 255, 255, 255, 255, 255],
[252, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255],
[255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255],
],
[
[255, 254, 254, 255, 255, 255, 255, 255, 255, 255, 255],
[253, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255],
[255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255],
],
[
[255, 254, 253, 255, 255, 255, 255, 255, 255, 255, 255],
[250, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255],
[254, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255],
],
[
[255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255],
[255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255],
[255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255],
],
],
[
[
[186, 251, 250, 255, 255, 255, 255, 255, 255, 255, 255],
[234, 251, 244, 254, 255, 255, 255, 255, 255, 255, 255],
[251, 251, 243, 253, 254, 255, 254, 255, 255, 255, 255],
],
[
[255, 253, 254, 255, 255, 255, 255, 255, 255, 255, 255],
[236, 253, 254, 255, 255, 255, 255, 255, 255, 255, 255],
[251, 253, 253, 254, 254, 255, 255, 255, 255, 255, 255],
],
[
[255, 254, 254, 255, 255, 255, 255, 255, 255, 255, 255],
[254, 254, 254, 255, 255, 255, 255, 255, 255, 255, 255],
[255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255],
],
[
[255, 254, 255, 255, 255, 255, 255, 255, 255, 255, 255],
[254, 254, 255, 255, 255, 255, 255, 255, 255, 255, 255],
[254, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255],
],
[
[255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255],
[254, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255],
[255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255],
],
[
[255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255],
[255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255],
[255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255],
],
[
[255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255],
[255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255],
[255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255],
],
[
[255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255],
[255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255],
[255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255],
],
],
[
[
[248, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255],
[250, 254, 252, 254, 255, 255, 255, 255, 255, 255, 255],
[248, 254, 249, 253, 255, 255, 255, 255, 255, 255, 255],
],
[
[255, 253, 253, 255, 255, 255, 255, 255, 255, 255, 255],
[246, 253, 253, 255, 255, 255, 255, 255, 255, 255, 255],
[252, 254, 251, 254, 254, 255, 255, 255, 255, 255, 255],
],
[
[255, 254, 252, 255, 255, 255, 255, 255, 255, 255, 255],
[248, 254, 253, 255, 255, 255, 255, 255, 255, 255, 255],
[253, 255, 254, 254, 255, 255, 255, 255, 255, 255, 255],
],
[
[255, 251, 254, 255, 255, 255, 255, 255, 255, 255, 255],
[245, 251, 254, 255, 255, 255, 255, 255, 255, 255, 255],
[253, 253, 254, 255, 255, 255, 255, 255, 255, 255, 255],
],
[
[255, 251, 253, 255, 255, 255, 255, 255, 255, 255, 255],
[252, 253, 254, 255, 255, 255, 255, 255, 255, 255, 255],
[255, 254, 255, 255, 255, 255, 255, 255, 255, 255, 255],
],
[
[255, 252, 255, 255, 255, 255, 255, 255, 255, 255, 255],
[249, 255, 254, 255, 255, 255, 255, 255, 255, 255, 255],
[255, 255, 254, 255, 255, 255, 255, 255, 255, 255, 255],
],
[
[255, 255, 253, 255, 255, 255, 255, 255, 255, 255, 255],
[250, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255],
[255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255],
],
[
[255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255],
[254, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255],
[255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255],
],
],
];
// Section 13.5
// Default Probabilities for tokens
static COEFF_PROBS: TokenProbTables = [
[
[
[128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128],
[128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128],
[128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128],
],
[
[253, 136, 254, 255, 228, 219, 128, 128, 128, 128, 128],
[189, 129, 242, 255, 227, 213, 255, 219, 128, 128, 128],
[106, 126, 227, 252, 214, 209, 255, 255, 128, 128, 128],
],
[
[1, 98, 248, 255, 236, 226, 255, 255, 128, 128, 128],
[181, 133, 238, 254, 221, 234, 255, 154, 128, 128, 128],
[78, 134, 202, 247, 198, 180, 255, 219, 128, 128, 128],
],
[
[1, 185, 249, 255, 243, 255, 128, 128, 128, 128, 128],
[184, 150, 247, 255, 236, 224, 128, 128, 128, 128, 128],
[77, 110, 216, 255, 236, 230, 128, 128, 128, 128, 128],
],
[
[1, 101, 251, 255, 241, 255, 128, 128, 128, 128, 128],
[170, 139, 241, 252, 236, 209, 255, 255, 128, 128, 128],
[37, 116, 196, 243, 228, 255, 255, 255, 128, 128, 128],
],
[
[1, 204, 254, 255, 245, 255, 128, 128, 128, 128, 128],
[207, 160, 250, 255, 238, 128, 128, 128, 128, 128, 128],
[102, 103, 231, 255, 211, 171, 128, 128, 128, 128, 128],
],
[
[1, 152, 252, 255, 240, 255, 128, 128, 128, 128, 128],
[177, 135, 243, 255, 234, 225, 128, 128, 128, 128, 128],
[80, 129, 211, 255, 194, 224, 128, 128, 128, 128, 128],
],
[
[1, 1, 255, 128, 128, 128, 128, 128, 128, 128, 128],
[246, 1, 255, 128, 128, 128, 128, 128, 128, 128, 128],
[255, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128],
],
],
[
[
[198, 35, 237, 223, 193, 187, 162, 160, 145, 155, 62],
[131, 45, 198, 221, 172, 176, 220, 157, 252, 221, 1],
[68, 47, 146, 208, 149, 167, 221, 162, 255, 223, 128],
],
[
[1, 149, 241, 255, 221, 224, 255, 255, 128, 128, 128],
[184, 141, 234, 253, 222, 220, 255, 199, 128, 128, 128],
[81, 99, 181, 242, 176, 190, 249, 202, 255, 255, 128],
],
[
[1, 129, 232, 253, 214, 197, 242, 196, 255, 255, 128],
[99, 121, 210, 250, 201, 198, 255, 202, 128, 128, 128],
[23, 91, 163, 242, 170, 187, 247, 210, 255, 255, 128],
],
[
[1, 200, 246, 255, 234, 255, 128, 128, 128, 128, 128],
[109, 178, 241, 255, 231, 245, 255, 255, 128, 128, 128],
[44, 130, 201, 253, 205, 192, 255, 255, 128, 128, 128],
],
[
[1, 132, 239, 251, 219, 209, 255, 165, 128, 128, 128],
[94, 136, 225, 251, 218, 190, 255, 255, 128, 128, 128],
[22, 100, 174, 245, 186, 161, 255, 199, 128, 128, 128],
],
[
[1, 182, 249, 255, 232, 235, 128, 128, 128, 128, 128],
[124, 143, 241, 255, 227, 234, 128, 128, 128, 128, 128],
[35, 77, 181, 251, 193, 211, 255, 205, 128, 128, 128],
],
[
[1, 157, 247, 255, 236, 231, 255, 255, 128, 128, 128],
[121, 141, 235, 255, 225, 227, 255, 255, 128, 128, 128],
[45, 99, 188, 251, 195, 217, 255, 224, 128, 128, 128],
],
[
[1, 1, 251, 255, 213, 255, 128, 128, 128, 128, 128],
[203, 1, 248, 255, 255, 128, 128, 128, 128, 128, 128],
[137, 1, 177, 255, 224, 255, 128, 128, 128, 128, 128],
],
],
[
[
[253, 9, 248, 251, 207, 208, 255, 192, 128, 128, 128],
[175, 13, 224, 243, 193, 185, 249, 198, 255, 255, 128],
[73, 17, 171, 221, 161, 179, 236, 167, 255, 234, 128],
],
[
[1, 95, 247, 253, 212, 183, 255, 255, 128, 128, 128],
[239, 90, 244, 250, 211, 209, 255, 255, 128, 128, 128],
[155, 77, 195, 248, 188, 195, 255, 255, 128, 128, 128],
],
[
[1, 24, 239, 251, 218, 219, 255, 205, 128, 128, 128],
[201, 51, 219, 255, 196, 186, 128, 128, 128, 128, 128],
[69, 46, 190, 239, 201, 218, 255, 228, 128, 128, 128],
],
[
[1, 191, 251, 255, 255, 128, 128, 128, 128, 128, 128],
[223, 165, 249, 255, 213, 255, 128, 128, 128, 128, 128],
[141, 124, 248, 255, 255, 128, 128, 128, 128, 128, 128],
],
[
[1, 16, 248, 255, 255, 128, 128, 128, 128, 128, 128],
[190, 36, 230, 255, 236, 255, 128, 128, 128, 128, 128],
[149, 1, 255, 128, 128, 128, 128, 128, 128, 128, 128],
],
[
[1, 226, 255, 128, 128, 128, 128, 128, 128, 128, 128],
[247, 192, 255, 128, 128, 128, 128, 128, 128, 128, 128],
[240, 128, 255, 128, 128, 128, 128, 128, 128, 128, 128],
],
[
[1, 134, 252, 255, 255, 128, 128, 128, 128, 128, 128],
[213, 62, 250, 255, 255, 128, 128, 128, 128, 128, 128],
[55, 93, 255, 128, 128, 128, 128, 128, 128, 128, 128],
],
[
[128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128],
[128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128],
[128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128],
],
],
[
[
[202, 24, 213, 235, 186, 191, 220, 160, 240, 175, 255],
[126, 38, 182, 232, 169, 184, 228, 174, 255, 187, 128],
[61, 46, 138, 219, 151, 178, 240, 170, 255, 216, 128],
],
[
[1, 112, 230, 250, 199, 191, 247, 159, 255, 255, 128],
[166, 109, 228, 252, 211, 215, 255, 174, 128, 128, 128],
[39, 77, 162, 232, 172, 180, 245, 178, 255, 255, 128],
],
[
[1, 52, 220, 246, 198, 199, 249, 220, 255, 255, 128],
[124, 74, 191, 243, 183, 193, 250, 221, 255, 255, 128],
[24, 71, 130, 219, 154, 170, 243, 182, 255, 255, 128],
],
[
[1, 182, 225, 249, 219, 240, 255, 224, 128, 128, 128],
[149, 150, 226, 252, 216, 205, 255, 171, 128, 128, 128],
[28, 108, 170, 242, 183, 194, 254, 223, 255, 255, 128],
],
[
[1, 81, 230, 252, 204, 203, 255, 192, 128, 128, 128],
[123, 102, 209, 247, 188, 196, 255, 233, 128, 128, 128],
[20, 95, 153, 243, 164, 173, 255, 203, 128, 128, 128],
],
[
[1, 222, 248, 255, 216, 213, 128, 128, 128, 128, 128],
[168, 175, 246, 252, 235, 205, 255, 255, 128, 128, 128],
[47, 116, 215, 255, 211, 212, 255, 255, 128, 128, 128],
],
[
[1, 121, 236, 253, 212, 214, 255, 255, 128, 128, 128],
[141, 84, 213, 252, 201, 202, 255, 219, 128, 128, 128],
[42, 80, 160, 240, 162, 185, 255, 205, 128, 128, 128],
],
[
[1, 1, 255, 128, 128, 128, 128, 128, 128, 128, 128],
[244, 1, 255, 128, 128, 128, 128, 128, 128, 128, 128],
[238, 1, 255, 128, 128, 128, 128, 128, 128, 128, 128],
],
],
];
// DCT Tokens
const DCT_0: i8 = 0;
const DCT_1: i8 = 1;
const DCT_2: i8 = 2;
const DCT_3: i8 = 3;
const DCT_4: i8 = 4;
const DCT_CAT1: i8 = 5;
const DCT_CAT2: i8 = 6;
const DCT_CAT3: i8 = 7;
const DCT_CAT4: i8 = 8;
const DCT_CAT5: i8 = 9;
const DCT_CAT6: i8 = 10;
const DCT_EOB: i8 = 11;
static DCT_TOKEN_TREE: [i8; 22] = [
-DCT_EOB, 2, -DCT_0, 4, -DCT_1, 6, 8, 12, -DCT_2, 10, -DCT_3, -DCT_4, 14, 16, -DCT_CAT1,
-DCT_CAT2, 18, 20, -DCT_CAT3, -DCT_CAT4, -DCT_CAT5, -DCT_CAT6,
];
static PROB_DCT_CAT: [[Prob; 12]; 6] = [
[159, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0],
[165, 145, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0],
[173, 148, 140, 0, 0, 0, 0, 0, 0, 0, 0, 0],
[176, 155, 140, 135, 0, 0, 0, 0, 0, 0, 0, 0],
[180, 157, 141, 134, 130, 0, 0, 0, 0, 0, 0, 0],
[254, 254, 243, 230, 196, 177, 153, 140, 133, 130, 129, 0],
];
static DCT_CAT_BASE: [u8; 6] = [5, 7, 11, 19, 35, 67];
static COEFF_BANDS: [u8; 16] = [0, 1, 2, 3, 6, 4, 5, 6, 6, 6, 6, 6, 6, 6, 6, 7];
#[rustfmt::skip]
static DC_QUANT: [i16; 128] = [
4, 5, 6, 7, 8, 9, 10, 10,
11, 12, 13, 14, 15, 16, 17, 17,
18, 19, 20, 20, 21, 21, 22, 22,
23, 23, 24, 25, 25, 26, 27, 28,
29, 30, 31, 32, 33, 34, 35, 36,
37, 37, 38, 39, 40, 41, 42, 43,
44, 45, 46, 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, 76, 77, 78, 79, 80, 81,
82, 83, 84, 85, 86, 87, 88, 89,
91, 93, 95, 96, 98, 100, 101, 102,
104, 106, 108, 110, 112, 114, 116, 118,
122, 124, 126, 128, 130, 132, 134, 136,
138, 140, 143, 145, 148, 151, 154, 157,
];
#[rustfmt::skip]
static AC_QUANT: [i16; 128] = [
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, 60,
62, 64, 66, 68, 70, 72, 74, 76,
78, 80, 82, 84, 86, 88, 90, 92,
94, 96, 98, 100, 102, 104, 106, 108,
110, 112, 114, 116, 119, 122, 125, 128,
131, 134, 137, 140, 143, 146, 149, 152,
155, 158, 161, 164, 167, 170, 173, 177,
181, 185, 189, 193, 197, 201, 205, 209,
213, 217, 221, 225, 229, 234, 239, 245,
249, 254, 259, 264, 269, 274, 279, 284,
];
static ZIGZAG: [u8; 16] = [0, 1, 4, 8, 5, 2, 3, 6, 9, 12, 13, 10, 7, 11, 14, 15];
struct BoolReader {
reader: Cursor<Vec<u8>>,
range: u32,
value: u32,
bit_count: u8,
eof: bool,
}
impl BoolReader {
pub(crate) fn new() -> BoolReader {
BoolReader {
reader: Default::default(),
range: 0,
value: 0,
bit_count: 0,
eof: false,
}
}
pub(crate) fn init(&mut self, buf: Vec<u8>) -> Result<(), DecodingError> {
if buf.len() < 2 {
return Err(DecodingError::NotEnoughInitData);
}
self.reader = Cursor::new(buf);
self.value = self.reader.read_u16::<BigEndian>()? as u32;
self.range = 255;
self.bit_count = 0;
Ok(())
}
pub(crate) fn read_bool(&mut self, probability: u8) -> Result<bool, DecodingError> {
let split = 1 + (((self.range - 1) * u32::from(probability)) >> 8);
let bigsplit = split << 8;
let retval = if self.value >= bigsplit {
self.range -= split;
self.value -= bigsplit;
true
} else {
self.range = split;
false
};
if self.range < 128 {
// Compute shift required to satisfy `self.range >= 128`.
// Apply that shift to `self.range`, `self.value`, and `self.bitcount`.
//
// Subtract 24 because we only care about leading zeros in the
// lowest byte of `self.range` which is a `u32`.
let shift = self.range.leading_zeros() - 24;
self.value <<= shift;
self.range <<= shift;
self.bit_count += shift as u8;
if self.bit_count >= 8 {
self.bit_count %= 8;
// libwebp seems to (sometimes?) allow bitstreams that read one byte past the end.
// This match statement replicates that logic.
let v = match self.reader.read_u8() {
Ok(v) => v,
Err(e) if e.kind() == ErrorKind::UnexpectedEof && !self.eof => {
self.eof = true;
0
}
Err(e) => return Err(DecodingError::IoError(e)),
};
self.value |= u32::from(v) << self.bit_count;
}
}
Ok(retval)
}
pub(crate) fn read_literal(&mut self, n: u8) -> Result<u8, DecodingError> {
let mut v = 0u8;
let mut n = n;
while n != 0 {
v = (v << 1) + self.read_bool(128u8)? as u8;
n -= 1;
}
Ok(v)
}
pub(crate) fn read_magnitude_and_sign(&mut self, n: u8) -> Result<i32, DecodingError> {
let magnitude = self.read_literal(n)?;
let sign = self.read_literal(1)?;
if sign == 1 {
Ok(-i32::from(magnitude))
} else {
Ok(i32::from(magnitude))
}
}
pub(crate) fn read_with_tree(
&mut self,
tree: &[i8],
probs: &[Prob],
start: isize,
) -> Result<i8, DecodingError> {
let mut index = start;
loop {
let a = self.read_bool(probs[index as usize >> 1])?;
let b = index + a as isize;
index = tree[b as usize] as isize;
if index <= 0 {
break;
}
}
Ok(-index as i8)
}
pub(crate) fn read_flag(&mut self) -> Result<bool, DecodingError> {
Ok(0 != self.read_literal(1)?)
}
}
#[derive(Default, Clone, Copy)]
struct MacroBlock {
bpred: [IntraMode; 16],
complexity: [u8; 9],
luma_mode: LumaMode,
chroma_mode: ChromaMode,
segmentid: u8,
coeffs_skipped: bool,
}
/// A Representation of the last decoded video frame
#[derive(Default, Debug, Clone)]
pub struct Frame {
/// The width of the luma plane
pub width: u16,
/// The height of the luma plane
pub height: u16,
/// The luma plane of the frame
pub ybuf: Vec<u8>,
/// The blue plane of the frame
pub ubuf: Vec<u8>,
/// The red plane of the frame
pub vbuf: Vec<u8>,
/// Indicates whether this frame is a keyframe
pub keyframe: bool,
version: u8,
/// Indicates whether this frame is intended for display
pub for_display: bool,
// Section 9.2
/// The pixel type of the frame as defined by Section 9.2
/// of the VP8 Specification
pub pixel_type: u8,
// Section 9.4 and 15
filter_type: bool, //if true uses simple filter // if false uses normal filter
filter_level: u8,
sharpness_level: u8,
}
impl Frame {
/// Chroma plane is half the size of the Luma plane
fn chroma_width(&self) -> u16 {
(self.width + 1) / 2
}
fn chroma_height(&self) -> u16 {
(self.height + 1) / 2
}
/// Fills an rgb buffer with the image
pub(crate) fn fill_rgb(&self, buf: &mut [u8]) {
const BPP: usize = 3;
let mut index = 0_usize;
for (y, row) in buf
.chunks_exact_mut(usize::from(self.width) * BPP)
.enumerate()
{
let chroma_index = usize::from(self.chroma_width()) * (y / 2);
let next_index = index + usize::from(self.width);
Frame::fill_rgb_row(
&self.ybuf[index..next_index],
&self.ubuf[chroma_index..],
&self.vbuf[chroma_index..],
row,
);
index = next_index;
}
}
fn fill_rgb_row(y_vec: &[u8], u_vec: &[u8], v_vec: &[u8], rgb: &mut [u8]) {
const YUV_FIX2: i32 = 6;
/// _mm_mulhi_epu16 emulation
fn mulhi(v: u8, coeff: u16) -> i32 {
((u32::from(v) * u32::from(coeff)) >> 8) as i32
}
fn clip(v: i32) -> u8 {
(v.max(0) >> YUV_FIX2).min(255) as u8
}
// Fill 2 pixels per iteration: these pixels share `u` and `v` components
let mut rgb_chunks = rgb.chunks_exact_mut(6);
let mut y_chunks = y_vec.chunks_exact(2);
let mut u_iter = u_vec.iter();
let mut v_iter = v_vec.iter();
for (((rgb, y), &u), &v) in (&mut rgb_chunks)
.zip(&mut y_chunks)
.zip(&mut u_iter)
.zip(&mut v_iter)
{
let coeffs = [
mulhi(v, 26149),
mulhi(u, 6419),
mulhi(v, 13320),
mulhi(u, 33050),
];
rgb[0] = clip(mulhi(y[0], 19077) + coeffs[0] - 14234);
rgb[1] = clip(mulhi(y[0], 19077) - coeffs[1] - coeffs[2] + 8708);
rgb[2] = clip(mulhi(y[0], 19077) + coeffs[3] - 17685);
rgb[3] = clip(mulhi(y[1], 19077) + coeffs[0] - 14234);
rgb[4] = clip(mulhi(y[1], 19077) - coeffs[1] - coeffs[2] + 8708);
rgb[5] = clip(mulhi(y[1], 19077) + coeffs[3] - 17685);
}
let remainder = rgb_chunks.into_remainder();
if remainder.len() >= 3 {
if let (Some(&y), Some(&u), Some(&v)) = (
y_chunks.remainder().iter().next(),
u_iter.next(),
v_iter.next(),
) {
let coeffs = [
mulhi(v, 26149),
mulhi(u, 6419),
mulhi(v, 13320),
mulhi(u, 33050),
];
remainder[0] = clip(mulhi(y, 19077) + coeffs[0] - 14234);
remainder[1] = clip(mulhi(y, 19077) - coeffs[1] - coeffs[2] + 8708);
remainder[2] = clip(mulhi(y, 19077) + coeffs[3] - 17685);
}
}
}
/// Fills an rgba buffer by skipping the alpha values
pub(crate) fn fill_rgba(&self, buf: &mut [u8]) {
let mut index = 0_usize;
for (y, row) in buf
.chunks_exact_mut(usize::from(self.width) * 4)
.enumerate()
{
let chroma_index_row = usize::from(self.chroma_width()) * (y / 2);
for (x, rgb_chunk) in row.chunks_exact_mut(4).enumerate() {
let chroma_index = chroma_index_row + x / 2;
Frame::fill_single(
self.ybuf[index],
self.ubuf[chroma_index],
self.vbuf[chroma_index],
rgb_chunk,
);
index += 1;
}
}
}
fn fill_single(y: u8, u: u8, v: u8, rgb: &mut [u8]) {
// // Conversion values from https://docs.microsoft.com/en-us/windows/win32/medfound/recommended-8-bit-yuv-formats-for-video-rendering#converting-8-bit-yuv-to-rgb888
// let c: i32 = i32::from(y) - 16;
// let d: i32 = i32::from(u) - 128;
// let e: i32 = i32::from(v) - 128;
// let r: u8 = clamp((298 * c + 409 * e + 128) >> 8, 0, 255)
// .try_into()
// .unwrap();
// let g: u8 = clamp((298 * c - 100 * d - 208 * e + 128) >> 8, 0, 255)
// .try_into()
// .unwrap();
// let b: u8 = clamp((298 * c + 516 * d + 128) >> 8, 0, 255)
// .try_into()
// .unwrap();
// Based on [src/dsp/yuv.h](https://github.com/webmproject/libwebp/blob/8534f53960befac04c9631e6e50d21dcb42dfeaf/src/dsp/yuv.h#L79)
// from the libwebp source.
const YUV_FIX2: i32 = 6;
const YUV_MASK2: i32 = (256 << YUV_FIX2) - 1;
/// _mm_mulhi_epu16 emulation
fn mulhi(v: u8, coeff: u16) -> i32 {
((u32::from(v) * u32::from(coeff)) >> 8) as i32
}
fn clip(v: i32) -> u8 {
if (v & !YUV_MASK2) == 0 {
(v >> YUV_FIX2) as u8
} else if v < 0 {
0
} else {
255
}
}
rgb[0] = clip(mulhi(y, 19077) + mulhi(v, 26149) - 14234);
rgb[1] = clip(mulhi(y, 19077) - mulhi(u, 6419) - mulhi(v, 13320) + 8708);
rgb[2] = clip(mulhi(y, 19077) + mulhi(u, 33050) - 17685);
}
/// Gets the buffer size