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vp8_parser.cc
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// Copyright 2015 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
//
// This file contains an implementation of a VP8 raw stream parser,
// as defined in RFC 6386.
#include "media/parsers/vp8_parser.h"
#include "base/logging.h"
namespace media {
#define ERROR_RETURN(what) \
do { \
DVLOG(1) << "Error while trying to read " #what; \
return false; \
} while (0)
#define BD_READ_BOOL_OR_RETURN(out) \
do { \
if (!bd_.ReadBool(out)) \
ERROR_RETURN(out); \
} while (0)
#define BD_READ_BOOL_WITH_PROB_OR_RETURN(out, prob) \
do { \
if (!bd_.ReadBool(out, prob)) \
ERROR_RETURN(out); \
} while (0)
#define BD_READ_UNSIGNED_OR_RETURN(num_bits, out) \
do { \
int _out; \
if (!bd_.ReadLiteral(num_bits, &_out)) \
ERROR_RETURN(out); \
*out = _out; \
} while (0)
#define BD_READ_SIGNED_OR_RETURN(num_bits, out) \
do { \
int _out; \
if (!bd_.ReadLiteralWithSign(num_bits, &_out)) \
ERROR_RETURN(out); \
*out = _out; \
} while (0)
Vp8FrameHeader::Vp8FrameHeader() {
memset(this, 0, sizeof(*this));
}
Vp8Parser::Vp8Parser() : stream_(nullptr), bytes_left_(0) {
}
Vp8Parser::~Vp8Parser() = default;
bool Vp8Parser::ParseFrame(const uint8_t* ptr,
size_t frame_size,
Vp8FrameHeader* fhdr) {
stream_ = ptr;
bytes_left_ = frame_size;
memset(fhdr, 0, sizeof(*fhdr));
fhdr->data = stream_;
fhdr->frame_size = bytes_left_;
if (!ParseFrameTag(fhdr))
return false;
fhdr->first_part_offset = stream_ - fhdr->data;
if (!ParseFrameHeader(fhdr))
return false;
if (!ParsePartitions(fhdr))
return false;
DVLOG(4) << "Frame parsed, start: " << static_cast<const void*>(ptr)
<< ", size: " << frame_size
<< ", offsets: to first_part=" << fhdr->first_part_offset
<< ", to macroblock data (in bits)=" << fhdr->macroblock_bit_offset;
return true;
}
static inline uint32_t GetBitsAt(uint32_t data, size_t shift, size_t num_bits) {
return ((data >> shift) & ((1 << num_bits) - 1));
}
bool Vp8Parser::ParseFrameTag(Vp8FrameHeader* fhdr) {
const size_t kFrameTagSize = 3;
if (bytes_left_ < kFrameTagSize)
return false;
uint32_t frame_tag = (stream_[2] << 16) | (stream_[1] << 8) | stream_[0];
fhdr->frame_type =
static_cast<Vp8FrameHeader::FrameType>(GetBitsAt(frame_tag, 0, 1));
fhdr->version = GetBitsAt(frame_tag, 1, 2);
fhdr->is_experimental = !!GetBitsAt(frame_tag, 3, 1);
fhdr->show_frame =!!GetBitsAt(frame_tag, 4, 1);
fhdr->first_part_size = GetBitsAt(frame_tag, 5, 19);
stream_ += kFrameTagSize;
bytes_left_ -= kFrameTagSize;
if (fhdr->IsKeyframe()) {
const size_t kKeyframeTagSize = 7;
if (bytes_left_ < kKeyframeTagSize)
return false;
static const uint8_t kVp8StartCode[] = {0x9d, 0x01, 0x2a};
if (memcmp(stream_, kVp8StartCode, sizeof(kVp8StartCode)) != 0)
return false;
stream_ += sizeof(kVp8StartCode);
bytes_left_ -= sizeof(kVp8StartCode);
uint16_t data = (stream_[1] << 8) | stream_[0];
fhdr->width = data & 0x3fff;
fhdr->horizontal_scale = data >> 14;
data = (stream_[3] << 8) | stream_[2];
fhdr->height = data & 0x3fff;
fhdr->vertical_scale = data >> 14;
stream_ += 4;
bytes_left_ -= 4;
}
return true;
}
bool Vp8Parser::ParseFrameHeader(Vp8FrameHeader* fhdr) {
if (!bd_.Initialize(stream_, bytes_left_))
return false;
bool keyframe = fhdr->IsKeyframe();
if (keyframe) {
unsigned int data;
BD_READ_UNSIGNED_OR_RETURN(1, &data); // color_space
BD_READ_UNSIGNED_OR_RETURN(1, &data); // clamping_type
}
if (!ParseSegmentationHeader(keyframe))
return false;
fhdr->segmentation_hdr = curr_segmentation_hdr_;
if (!ParseLoopFilterHeader(keyframe))
return false;
fhdr->loopfilter_hdr = curr_loopfilter_hdr_;
int log2_nbr_of_dct_partitions;
BD_READ_UNSIGNED_OR_RETURN(2, &log2_nbr_of_dct_partitions);
fhdr->num_of_dct_partitions = static_cast<size_t>(1)
<< log2_nbr_of_dct_partitions;
if (!ParseQuantizationHeader(&fhdr->quantization_hdr))
return false;
if (keyframe) {
BD_READ_BOOL_OR_RETURN(&fhdr->refresh_entropy_probs);
} else {
BD_READ_BOOL_OR_RETURN(&fhdr->refresh_golden_frame);
BD_READ_BOOL_OR_RETURN(&fhdr->refresh_alternate_frame);
int refresh_mode;
if (!fhdr->refresh_golden_frame) {
BD_READ_UNSIGNED_OR_RETURN(2, &refresh_mode);
fhdr->copy_buffer_to_golden =
static_cast<Vp8FrameHeader::GoldenRefreshMode>(refresh_mode);
}
if (!fhdr->refresh_alternate_frame) {
BD_READ_UNSIGNED_OR_RETURN(2, &refresh_mode);
fhdr->copy_buffer_to_alternate =
static_cast<Vp8FrameHeader::AltRefreshMode>(refresh_mode);
}
BD_READ_UNSIGNED_OR_RETURN(1, &fhdr->sign_bias_golden);
BD_READ_UNSIGNED_OR_RETURN(1, &fhdr->sign_bias_alternate);
BD_READ_BOOL_OR_RETURN(&fhdr->refresh_entropy_probs);
BD_READ_BOOL_OR_RETURN(&fhdr->refresh_last);
}
if (keyframe)
ResetProbs();
fhdr->entropy_hdr = curr_entropy_hdr_;
if (!ParseTokenProbs(&fhdr->entropy_hdr, fhdr->refresh_entropy_probs))
return false;
BD_READ_BOOL_OR_RETURN(&fhdr->mb_no_skip_coeff);
if (fhdr->mb_no_skip_coeff)
BD_READ_UNSIGNED_OR_RETURN(8, &fhdr->prob_skip_false);
if (!keyframe) {
BD_READ_UNSIGNED_OR_RETURN(8, &fhdr->prob_intra);
BD_READ_UNSIGNED_OR_RETURN(8, &fhdr->prob_last);
BD_READ_UNSIGNED_OR_RETURN(8, &fhdr->prob_gf);
}
if (!ParseIntraProbs(&fhdr->entropy_hdr, fhdr->refresh_entropy_probs,
keyframe))
return false;
if (!keyframe) {
if (!ParseMVProbs(&fhdr->entropy_hdr, fhdr->refresh_entropy_probs))
return false;
}
fhdr->macroblock_bit_offset = bd_.BitOffset();
fhdr->bool_dec_range = bd_.GetRange();
fhdr->bool_dec_value = bd_.GetBottom();
fhdr->bool_dec_count = 7 - (bd_.BitOffset() + 7) % 8;
return true;
}
bool Vp8Parser::ParseSegmentationHeader(bool keyframe) {
Vp8SegmentationHeader* shdr = &curr_segmentation_hdr_;
if (keyframe)
memset(shdr, 0, sizeof(*shdr));
BD_READ_BOOL_OR_RETURN(&shdr->segmentation_enabled);
if (!shdr->segmentation_enabled)
return true;
BD_READ_BOOL_OR_RETURN(&shdr->update_mb_segmentation_map);
BD_READ_BOOL_OR_RETURN(&shdr->update_segment_feature_data);
if (shdr->update_segment_feature_data) {
int mode;
BD_READ_UNSIGNED_OR_RETURN(1, &mode);
shdr->segment_feature_mode =
static_cast<Vp8SegmentationHeader::SegmentFeatureMode>(mode);
for (size_t i = 0; i < kMaxMBSegments; ++i) {
bool quantizer_update;
BD_READ_BOOL_OR_RETURN(&quantizer_update);
if (quantizer_update)
BD_READ_SIGNED_OR_RETURN(7, &shdr->quantizer_update_value[i]);
else
shdr->quantizer_update_value[i] = 0;
}
for (size_t i = 0; i < kMaxMBSegments; ++i) {
bool loop_filter_update;
BD_READ_BOOL_OR_RETURN(&loop_filter_update);
if (loop_filter_update)
BD_READ_SIGNED_OR_RETURN(6, &shdr->lf_update_value[i]);
else
shdr->lf_update_value[i] = 0;
}
}
if (shdr->update_mb_segmentation_map) {
for (size_t i = 0; i < kNumMBFeatureTreeProbs; ++i) {
bool segment_prob_update;
BD_READ_BOOL_OR_RETURN(&segment_prob_update);
if (segment_prob_update)
BD_READ_UNSIGNED_OR_RETURN(8, &shdr->segment_prob[i]);
else
shdr->segment_prob[i] = Vp8SegmentationHeader::kDefaultSegmentProb;
}
}
return true;
}
bool Vp8Parser::ParseLoopFilterHeader(bool keyframe) {
Vp8LoopFilterHeader* lfhdr = &curr_loopfilter_hdr_;
if (keyframe)
memset(lfhdr, 0, sizeof(*lfhdr));
int type;
BD_READ_UNSIGNED_OR_RETURN(1, &type);
lfhdr->type = static_cast<Vp8LoopFilterHeader::Type>(type);
BD_READ_UNSIGNED_OR_RETURN(6, &lfhdr->level);
BD_READ_UNSIGNED_OR_RETURN(3, &lfhdr->sharpness_level);
BD_READ_BOOL_OR_RETURN(&lfhdr->loop_filter_adj_enable);
if (lfhdr->loop_filter_adj_enable) {
BD_READ_BOOL_OR_RETURN(&lfhdr->mode_ref_lf_delta_update);
if (lfhdr->mode_ref_lf_delta_update) {
for (size_t i = 0; i < kNumBlockContexts; ++i) {
bool ref_frame_delta_update_flag;
BD_READ_BOOL_OR_RETURN(&ref_frame_delta_update_flag);
if (ref_frame_delta_update_flag)
BD_READ_SIGNED_OR_RETURN(6, &lfhdr->ref_frame_delta[i]);
}
for (size_t i = 0; i < kNumBlockContexts; ++i) {
bool mb_mode_delta_update_flag;
BD_READ_BOOL_OR_RETURN(&mb_mode_delta_update_flag);
if (mb_mode_delta_update_flag)
BD_READ_SIGNED_OR_RETURN(6, &lfhdr->mb_mode_delta[i]);
}
}
}
return true;
}
bool Vp8Parser::ParseQuantizationHeader(Vp8QuantizationHeader* qhdr) {
// If any of the delta values is not present, the delta should be zero.
memset(qhdr, 0, sizeof(*qhdr));
BD_READ_UNSIGNED_OR_RETURN(7, &qhdr->y_ac_qi);
bool delta_present;
BD_READ_BOOL_OR_RETURN(&delta_present);
if (delta_present)
BD_READ_SIGNED_OR_RETURN(4, &qhdr->y_dc_delta);
BD_READ_BOOL_OR_RETURN(&delta_present);
if (delta_present)
BD_READ_SIGNED_OR_RETURN(4, &qhdr->y2_dc_delta);
BD_READ_BOOL_OR_RETURN(&delta_present);
if (delta_present)
BD_READ_SIGNED_OR_RETURN(4, &qhdr->y2_ac_delta);
BD_READ_BOOL_OR_RETURN(&delta_present);
if (delta_present)
BD_READ_SIGNED_OR_RETURN(4, &qhdr->uv_dc_delta);
BD_READ_BOOL_OR_RETURN(&delta_present);
if (delta_present)
BD_READ_SIGNED_OR_RETURN(4, &qhdr->uv_ac_delta);
return true;
}
// See spec for details on these values.
const uint8_t kCoeffUpdateProbs[kNumBlockTypes][kNumCoeffBands]
[kNumPrevCoeffContexts][kNumEntropyNodes] = {
{
{
{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},
},
},
};
const uint8_t kKeyframeYModeProbs[kNumYModeProbs] = {145, 156, 163, 128};
const uint8_t kKeyframeUVModeProbs[kNumUVModeProbs] = {142, 114, 183};
const uint8_t kDefaultYModeProbs[kNumYModeProbs] = {112, 86, 140, 37};
const uint8_t kDefaultUVModeProbs[kNumUVModeProbs] = {162, 101, 204};
const uint8_t kDefaultCoeffProbs[kNumBlockTypes][kNumCoeffBands]
[kNumPrevCoeffContexts][kNumEntropyNodes] = {
{
{
{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},
},
},
};
const uint8_t kMVUpdateProbs[kNumMVContexts][kNumMVProbs] =
{
{
237, 246, 253, 253, 254, 254, 254, 254, 254,
254, 254, 254, 254, 254, 250, 250, 252, 254, 254,
},
{
231, 243, 245, 253, 254, 254, 254, 254, 254,
254, 254, 254, 254, 254, 251, 251, 254, 254, 254,
},
};
const uint8_t kDefaultMVProbs[kNumMVContexts][kNumMVProbs] = {
{
162, 128, 225, 146, 172, 147, 214, 39, 156,
128, 129, 132, 75, 145, 178, 206, 239, 254, 254,
},
{
164, 128, 204, 170, 119, 235, 140, 230, 228,
128, 130, 130, 74, 148, 180, 203, 236, 254, 254,
},
};
void Vp8Parser::ResetProbs() {
static_assert(
sizeof(curr_entropy_hdr_.coeff_probs) == sizeof(kDefaultCoeffProbs),
"coeff_probs_arrays_must_be_of_correct_size");
memcpy(curr_entropy_hdr_.coeff_probs, kDefaultCoeffProbs,
sizeof(curr_entropy_hdr_.coeff_probs));
static_assert(sizeof(curr_entropy_hdr_.mv_probs) == sizeof(kDefaultMVProbs),
"mv_probs_arrays_must_be_of_correct_size");
memcpy(curr_entropy_hdr_.mv_probs, kDefaultMVProbs,
sizeof(curr_entropy_hdr_.mv_probs));
static_assert(
sizeof(curr_entropy_hdr_.y_mode_probs) == sizeof(kDefaultYModeProbs),
"y_probs_arrays_must_be_of_correct_size");
memcpy(curr_entropy_hdr_.y_mode_probs, kDefaultYModeProbs,
sizeof(curr_entropy_hdr_.y_mode_probs));
static_assert(
sizeof(curr_entropy_hdr_.uv_mode_probs) == sizeof(kDefaultUVModeProbs),
"uv_probs_arrays_must_be_of_correct_size");
memcpy(curr_entropy_hdr_.uv_mode_probs, kDefaultUVModeProbs,
sizeof(curr_entropy_hdr_.uv_mode_probs));
}
bool Vp8Parser::ParseTokenProbs(Vp8EntropyHeader* ehdr,
bool update_curr_probs) {
for (size_t i = 0; i < kNumBlockTypes; ++i) {
for (size_t j = 0; j < kNumCoeffBands; ++j) {
for (size_t k = 0; k < kNumPrevCoeffContexts; ++k) {
for (size_t l = 0; l < kNumEntropyNodes; ++l) {
bool coeff_prob_update_flag;
BD_READ_BOOL_WITH_PROB_OR_RETURN(&coeff_prob_update_flag,
kCoeffUpdateProbs[i][j][k][l]);
if (coeff_prob_update_flag)
BD_READ_UNSIGNED_OR_RETURN(8, &ehdr->coeff_probs[i][j][k][l]);
}
}
}
}
if (update_curr_probs) {
memcpy(curr_entropy_hdr_.coeff_probs, ehdr->coeff_probs,
sizeof(curr_entropy_hdr_.coeff_probs));
}
return true;
}
bool Vp8Parser::ParseIntraProbs(Vp8EntropyHeader* ehdr,
bool update_curr_probs,
bool keyframe) {
if (keyframe) {
static_assert(
sizeof(ehdr->y_mode_probs) == sizeof(kKeyframeYModeProbs),
"y_probs_arrays_must_be_of_correct_size");
memcpy(ehdr->y_mode_probs, kKeyframeYModeProbs,
sizeof(ehdr->y_mode_probs));
static_assert(
sizeof(ehdr->uv_mode_probs) == sizeof(kKeyframeUVModeProbs),
"uv_probs_arrays_must_be_of_correct_size");
memcpy(ehdr->uv_mode_probs, kKeyframeUVModeProbs,
sizeof(ehdr->uv_mode_probs));
} else {
bool intra_16x16_prob_update_flag;
BD_READ_BOOL_OR_RETURN(&intra_16x16_prob_update_flag);
if (intra_16x16_prob_update_flag) {
for (size_t i = 0; i < kNumYModeProbs; ++i)
BD_READ_UNSIGNED_OR_RETURN(8, &ehdr->y_mode_probs[i]);
if (update_curr_probs) {
memcpy(curr_entropy_hdr_.y_mode_probs, ehdr->y_mode_probs,
sizeof(curr_entropy_hdr_.y_mode_probs));
}
}
bool intra_chroma_prob_update_flag;
BD_READ_BOOL_OR_RETURN(&intra_chroma_prob_update_flag);
if (intra_chroma_prob_update_flag) {
for (size_t i = 0; i < kNumUVModeProbs; ++i)
BD_READ_UNSIGNED_OR_RETURN(8, &ehdr->uv_mode_probs[i]);
if (update_curr_probs) {
memcpy(curr_entropy_hdr_.uv_mode_probs, ehdr->uv_mode_probs,
sizeof(curr_entropy_hdr_.uv_mode_probs));
}
}
}
return true;
}
bool Vp8Parser::ParseMVProbs(Vp8EntropyHeader* ehdr, bool update_curr_probs) {
for (size_t mv_ctx = 0; mv_ctx < kNumMVContexts; ++mv_ctx) {
for (size_t p = 0; p < kNumMVProbs; ++p) {
bool mv_prob_update_flag;
BD_READ_BOOL_WITH_PROB_OR_RETURN(&mv_prob_update_flag,
kMVUpdateProbs[mv_ctx][p]);
if (mv_prob_update_flag) {
uint8_t prob;
BD_READ_UNSIGNED_OR_RETURN(7, &prob);
ehdr->mv_probs[mv_ctx][p] = prob ? (prob << 1) : 1;
}
}
}
if (update_curr_probs) {
memcpy(curr_entropy_hdr_.mv_probs, ehdr->mv_probs,
sizeof(curr_entropy_hdr_.mv_probs));
}
return true;
}
bool Vp8Parser::ParsePartitions(Vp8FrameHeader* fhdr) {
CHECK_GE(fhdr->num_of_dct_partitions, 1u);
CHECK_LE(fhdr->num_of_dct_partitions, kMaxDCTPartitions);
// DCT partitions start after the first partition and partition size values
// that follow it. There are num_of_dct_partitions - 1 sizes stored in the
// stream after the first partition, each 3 bytes long. The size of last
// DCT partition is not stored in the stream, but is instead calculated by
// taking the remainder of the frame size after the penultimate DCT partition.
size_t first_dct_pos = fhdr->first_part_offset + fhdr->first_part_size +
(fhdr->num_of_dct_partitions - 1) * 3;
// Make sure we have enough data for the first partition and partition sizes.
if (fhdr->frame_size < first_dct_pos)
return false;
// Total size of all DCT partitions.
size_t bytes_left = fhdr->frame_size - first_dct_pos;
// Position ourselves at the beginning of partition size values.
const uint8_t* ptr =
fhdr->data + fhdr->first_part_offset + fhdr->first_part_size;
// Read sizes from the stream (if present).
for (size_t i = 0; i < fhdr->num_of_dct_partitions - 1; ++i) {
fhdr->dct_partition_sizes[i] = (ptr[2] << 16) | (ptr[1] << 8) | ptr[0];
// Make sure we have enough data in the stream for ith partition and
// subtract its size from total.
if (bytes_left < fhdr->dct_partition_sizes[i])
return false;
bytes_left -= fhdr->dct_partition_sizes[i];
// Move to the position of the next partition size value.
ptr += 3;
}
// The remainder of the data belongs to the last DCT partition.
fhdr->dct_partition_sizes[fhdr->num_of_dct_partitions - 1] = bytes_left;
DVLOG(4) << "Control part size: " << fhdr->first_part_size;
for (size_t i = 0; i < fhdr->num_of_dct_partitions; ++i)
DVLOG(4) << "DCT part " << i << " size: " << fhdr->dct_partition_sizes[i];
return true;
}
} // namespace media