114 lines
3.7 KiB
C
114 lines
3.7 KiB
C
|
// Copyright 2010 Google Inc. All Rights Reserved.
|
||
|
|
//
|
||
|
|
// This code is licensed under the same terms as WebM:
|
||
|
|
// Software License Agreement: http://www.webmproject.org/license/software/
|
||
|
|
// Additional IP Rights Grant: http://www.webmproject.org/license/additional/
|
||
|
|
// -----------------------------------------------------------------------------
|
||
|
|
//
|
||
|
|
// Quantizer initialization
|
||
|
|
//
|
||
|
|
// Author: Skal (pascal.massimino@gmail.com)
|
||
|
|
|
||
|
|
#include "./vp8i.h"
|
||
|
|
|
||
|
|
#if defined(__cplusplus) || defined(c_plusplus)
|
||
|
|
extern "C" {
|
||
|
|
#endif
|
||
|
|
|
||
|
|
static WEBP_INLINE int clip(int v, int M) {
|
||
|
|
return v < 0 ? 0 : v > M ? M : v;
|
||
|
|
}
|
||
|
|
|
||
|
|
// Paragraph 14.1
|
||
|
|
static const uint8_t kDcTable[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
|
||
|
|
};
|
||
|
|
|
||
|
|
static const uint16_t kAcTable[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
|
||
|
|
};
|
||
|
|
|
||
|
|
//------------------------------------------------------------------------------
|
||
|
|
// Paragraph 9.6
|
||
|
|
|
||
|
|
void VP8ParseQuant(VP8Decoder* const dec) {
|
||
|
|
VP8BitReader* const br = &dec->br_;
|
||
|
|
const int base_q0 = VP8GetValue(br, 7);
|
||
|
|
const int dqy1_dc = VP8Get(br) ? VP8GetSignedValue(br, 4) : 0;
|
||
|
|
const int dqy2_dc = VP8Get(br) ? VP8GetSignedValue(br, 4) : 0;
|
||
|
|
const int dqy2_ac = VP8Get(br) ? VP8GetSignedValue(br, 4) : 0;
|
||
|
|
const int dquv_dc = VP8Get(br) ? VP8GetSignedValue(br, 4) : 0;
|
||
|
|
const int dquv_ac = VP8Get(br) ? VP8GetSignedValue(br, 4) : 0;
|
||
|
|
|
||
|
|
const VP8SegmentHeader* const hdr = &dec->segment_hdr_;
|
||
|
|
int i;
|
||
|
|
|
||
|
|
for (i = 0; i < NUM_MB_SEGMENTS; ++i) {
|
||
|
|
int q;
|
||
|
|
if (hdr->use_segment_) {
|
||
|
|
q = hdr->quantizer_[i];
|
||
|
|
if (!hdr->absolute_delta_) {
|
||
|
|
q += base_q0;
|
||
|
|
}
|
||
|
|
} else {
|
||
|
|
if (i > 0) {
|
||
|
|
dec->dqm_[i] = dec->dqm_[0];
|
||
|
|
continue;
|
||
|
|
} else {
|
||
|
|
q = base_q0;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
{
|
||
|
|
VP8QuantMatrix* const m = &dec->dqm_[i];
|
||
|
|
m->y1_mat_[0] = kDcTable[clip(q + dqy1_dc, 127)];
|
||
|
|
m->y1_mat_[1] = kAcTable[clip(q + 0, 127)];
|
||
|
|
|
||
|
|
m->y2_mat_[0] = kDcTable[clip(q + dqy2_dc, 127)] * 2;
|
||
|
|
// For all x in [0..284], x*155/100 is bitwise equal to (x*101581) >> 16.
|
||
|
|
// The smallest precision for that is '(x*6349) >> 12' but 16 is a good
|
||
|
|
// word size.
|
||
|
|
m->y2_mat_[1] = (kAcTable[clip(q + dqy2_ac, 127)] * 101581) >> 16;
|
||
|
|
if (m->y2_mat_[1] < 8) m->y2_mat_[1] = 8;
|
||
|
|
|
||
|
|
m->uv_mat_[0] = kDcTable[clip(q + dquv_dc, 117)];
|
||
|
|
m->uv_mat_[1] = kAcTable[clip(q + dquv_ac, 127)];
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
//------------------------------------------------------------------------------
|
||
|
|
|
||
|
|
#if defined(__cplusplus) || defined(c_plusplus)
|
||
|
|
} // extern "C"
|
||
|
|
#endif
|