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h264_parser.cc
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// Copyright 2014 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.
#include "base/logging.h"
#include "base/macros.h"
#include "base/memory/scoped_ptr.h"
#include "base/stl_util.h"
#include "media/base/decrypt_config.h"
#include "media/filters/h264_parser.h"
namespace media {
bool H264SliceHeader::IsPSlice() const {
return (slice_type % 5 == kPSlice);
}
bool H264SliceHeader::IsBSlice() const {
return (slice_type % 5 == kBSlice);
}
bool H264SliceHeader::IsISlice() const {
return (slice_type % 5 == kISlice);
}
bool H264SliceHeader::IsSPSlice() const {
return (slice_type % 5 == kSPSlice);
}
bool H264SliceHeader::IsSISlice() const {
return (slice_type % 5 == kSISlice);
}
H264NALU::H264NALU() {
memset(this, 0, sizeof(*this));
}
H264SPS::H264SPS() {
memset(this, 0, sizeof(*this));
}
H264PPS::H264PPS() {
memset(this, 0, sizeof(*this));
}
H264SliceHeader::H264SliceHeader() {
memset(this, 0, sizeof(*this));
}
H264SEIMessage::H264SEIMessage() {
memset(this, 0, sizeof(*this));
}
#define READ_BITS_OR_RETURN(num_bits, out) \
do { \
int _out; \
if (!br_.ReadBits(num_bits, &_out)) { \
DVLOG(1) \
<< "Error in stream: unexpected EOS while trying to read " #out; \
return kInvalidStream; \
} \
*out = _out; \
} while (0)
#define READ_BOOL_OR_RETURN(out) \
do { \
int _out; \
if (!br_.ReadBits(1, &_out)) { \
DVLOG(1) \
<< "Error in stream: unexpected EOS while trying to read " #out; \
return kInvalidStream; \
} \
*out = _out != 0; \
} while (0)
#define READ_UE_OR_RETURN(out) \
do { \
if (ReadUE(out) != kOk) { \
DVLOG(1) << "Error in stream: invalid value while trying to read " #out; \
return kInvalidStream; \
} \
} while (0)
#define READ_SE_OR_RETURN(out) \
do { \
if (ReadSE(out) != kOk) { \
DVLOG(1) << "Error in stream: invalid value while trying to read " #out; \
return kInvalidStream; \
} \
} while (0)
#define IN_RANGE_OR_RETURN(val, min, max) \
do { \
if ((val) < (min) || (val) > (max)) { \
DVLOG(1) << "Error in stream: invalid value, expected " #val " to be" \
<< " in range [" << (min) << ":" << (max) << "]" \
<< " found " << (val) << " instead"; \
return kInvalidStream; \
} \
} while (0)
#define TRUE_OR_RETURN(a) \
do { \
if (!(a)) { \
DVLOG(1) << "Error in stream: invalid value, expected " << #a; \
return kInvalidStream; \
} \
} while (0)
// ISO 14496 part 10
// VUI parameters: Table E-1 "Meaning of sample aspect ratio indicator"
static const int kTableSarWidth[] = {
0, 1, 12, 10, 16, 40, 24, 20, 32, 80, 18, 15, 64, 160, 4, 3, 2
};
static const int kTableSarHeight[] = {
0, 1, 11, 11, 11, 33, 11, 11, 11, 33, 11, 11, 33, 99, 3, 2, 1
};
static_assert(arraysize(kTableSarWidth) == arraysize(kTableSarHeight),
"sar tables must have the same size");
H264Parser::H264Parser() {
Reset();
}
H264Parser::~H264Parser() {
STLDeleteValues(&active_SPSes_);
STLDeleteValues(&active_PPSes_);
}
void H264Parser::Reset() {
stream_ = NULL;
bytes_left_ = 0;
encrypted_ranges_.clear();
}
void H264Parser::SetStream(const uint8_t* stream, off_t stream_size) {
std::vector<SubsampleEntry> subsamples;
SetEncryptedStream(stream, stream_size, subsamples);
}
void H264Parser::SetEncryptedStream(
const uint8_t* stream,
off_t stream_size,
const std::vector<SubsampleEntry>& subsamples) {
DCHECK(stream);
DCHECK_GT(stream_size, 0);
stream_ = stream;
bytes_left_ = stream_size;
encrypted_ranges_.clear();
const uint8_t* start = stream;
const uint8_t* stream_end = stream_ + bytes_left_;
for (size_t i = 0; i < subsamples.size() && start < stream_end; ++i) {
start += subsamples[i].clear_bytes;
const uint8_t* end =
std::min(start + subsamples[i].cypher_bytes, stream_end);
encrypted_ranges_.Add(start, end);
start = end;
}
}
const H264PPS* H264Parser::GetPPS(int pps_id) const {
auto it = active_PPSes_.find(pps_id);
if (it == active_PPSes_.end()) {
DVLOG(1) << "Requested a nonexistent PPS id " << pps_id;
return nullptr;
}
return it->second;
}
const H264SPS* H264Parser::GetSPS(int sps_id) const {
auto it = active_SPSes_.find(sps_id);
if (it == active_SPSes_.end()) {
DVLOG(1) << "Requested a nonexistent SPS id " << sps_id;
return nullptr;
}
return it->second;
}
static inline bool IsStartCode(const uint8_t* data) {
return data[0] == 0x00 && data[1] == 0x00 && data[2] == 0x01;
}
// static
bool H264Parser::FindStartCode(const uint8_t* data,
off_t data_size,
off_t* offset,
off_t* start_code_size) {
DCHECK_GE(data_size, 0);
off_t bytes_left = data_size;
while (bytes_left >= 3) {
if (IsStartCode(data)) {
// Found three-byte start code, set pointer at its beginning.
*offset = data_size - bytes_left;
*start_code_size = 3;
// If there is a zero byte before this start code,
// then it's actually a four-byte start code, so backtrack one byte.
if (*offset > 0 && *(data - 1) == 0x00) {
--(*offset);
++(*start_code_size);
}
return true;
}
++data;
--bytes_left;
}
// End of data: offset is pointing to the first byte that was not considered
// as a possible start of a start code.
// Note: there is no security issue when receiving a negative |data_size|
// since in this case, |bytes_left| is equal to |data_size| and thus
// |*offset| is equal to 0 (valid offset).
*offset = data_size - bytes_left;
*start_code_size = 0;
return false;
}
bool H264Parser::LocateNALU(off_t* nalu_size, off_t* start_code_size) {
// Find the start code of next NALU.
off_t nalu_start_off = 0;
off_t annexb_start_code_size = 0;
if (!FindStartCodeInClearRanges(stream_, bytes_left_,
encrypted_ranges_,
&nalu_start_off, &annexb_start_code_size)) {
DVLOG(4) << "Could not find start code, end of stream?";
return false;
}
// Move the stream to the beginning of the NALU (pointing at the start code).
stream_ += nalu_start_off;
bytes_left_ -= nalu_start_off;
const uint8_t* nalu_data = stream_ + annexb_start_code_size;
off_t max_nalu_data_size = bytes_left_ - annexb_start_code_size;
if (max_nalu_data_size <= 0) {
DVLOG(3) << "End of stream";
return false;
}
// Find the start code of next NALU;
// if successful, |nalu_size_without_start_code| is the number of bytes from
// after previous start code to before this one;
// if next start code is not found, it is still a valid NALU since there
// are some bytes left after the first start code: all the remaining bytes
// belong to the current NALU.
off_t next_start_code_size = 0;
off_t nalu_size_without_start_code = 0;
if (!FindStartCodeInClearRanges(nalu_data, max_nalu_data_size,
encrypted_ranges_,
&nalu_size_without_start_code,
&next_start_code_size)) {
nalu_size_without_start_code = max_nalu_data_size;
}
*nalu_size = nalu_size_without_start_code + annexb_start_code_size;
*start_code_size = annexb_start_code_size;
return true;
}
bool H264Parser::FindStartCodeInClearRanges(
const uint8_t* data,
off_t data_size,
const Ranges<const uint8_t*>& encrypted_ranges,
off_t* offset,
off_t* start_code_size) {
if (encrypted_ranges.size() == 0)
return FindStartCode(data, data_size, offset, start_code_size);
DCHECK_GE(data_size, 0);
const uint8_t* start = data;
do {
off_t bytes_left = data_size - (start - data);
if (!FindStartCode(start, bytes_left, offset, start_code_size))
return false;
// Construct a Ranges object that represents the region occupied
// by the start code and the 1 byte needed to read the NAL unit type.
const uint8_t* start_code = start + *offset;
const uint8_t* start_code_end = start_code + *start_code_size;
Ranges<const uint8_t*> start_code_range;
start_code_range.Add(start_code, start_code_end + 1);
if (encrypted_ranges.IntersectionWith(start_code_range).size() > 0) {
// The start code is inside an encrypted section so we need to scan
// for another start code.
*start_code_size = 0;
start += std::min(*offset + 1, bytes_left);
}
} while (*start_code_size == 0);
// Update |*offset| to include the data we skipped over.
*offset += start - data;
return true;
}
H264Parser::Result H264Parser::ReadUE(int* val) {
int num_bits = -1;
int bit;
int rest;
// Count the number of contiguous zero bits.
do {
READ_BITS_OR_RETURN(1, &bit);
num_bits++;
} while (bit == 0);
if (num_bits > 31)
return kInvalidStream;
// Calculate exp-Golomb code value of size num_bits.
*val = (1 << num_bits) - 1;
if (num_bits > 0) {
READ_BITS_OR_RETURN(num_bits, &rest);
*val += rest;
}
return kOk;
}
H264Parser::Result H264Parser::ReadSE(int* val) {
int ue;
Result res;
// See Chapter 9 in the spec.
res = ReadUE(&ue);
if (res != kOk)
return res;
if (ue % 2 == 0)
*val = -(ue / 2);
else
*val = ue / 2 + 1;
return kOk;
}
H264Parser::Result H264Parser::AdvanceToNextNALU(H264NALU* nalu) {
off_t start_code_size;
off_t nalu_size_with_start_code;
if (!LocateNALU(&nalu_size_with_start_code, &start_code_size)) {
DVLOG(4) << "Could not find next NALU, bytes left in stream: "
<< bytes_left_;
return kEOStream;
}
nalu->data = stream_ + start_code_size;
nalu->size = nalu_size_with_start_code - start_code_size;
DVLOG(4) << "NALU found: size=" << nalu_size_with_start_code;
// Initialize bit reader at the start of found NALU.
if (!br_.Initialize(nalu->data, nalu->size))
return kEOStream;
// Move parser state to after this NALU, so next time AdvanceToNextNALU
// is called, we will effectively be skipping it;
// other parsing functions will use the position saved
// in bit reader for parsing, so we don't have to remember it here.
stream_ += nalu_size_with_start_code;
bytes_left_ -= nalu_size_with_start_code;
// Read NALU header, skip the forbidden_zero_bit, but check for it.
int data;
READ_BITS_OR_RETURN(1, &data);
TRUE_OR_RETURN(data == 0);
READ_BITS_OR_RETURN(2, &nalu->nal_ref_idc);
READ_BITS_OR_RETURN(5, &nalu->nal_unit_type);
DVLOG(4) << "NALU type: " << static_cast<int>(nalu->nal_unit_type)
<< " at: " << reinterpret_cast<const void*>(nalu->data)
<< " size: " << nalu->size
<< " ref: " << static_cast<int>(nalu->nal_ref_idc);
return kOk;
}
// Default scaling lists (per spec).
static const int kDefault4x4Intra[kH264ScalingList4x4Length] = {
6, 13, 13, 20, 20, 20, 28, 28, 28, 28, 32, 32, 32, 37, 37, 42, };
static const int kDefault4x4Inter[kH264ScalingList4x4Length] = {
10, 14, 14, 20, 20, 20, 24, 24, 24, 24, 27, 27, 27, 30, 30, 34, };
static const int kDefault8x8Intra[kH264ScalingList8x8Length] = {
6, 10, 10, 13, 11, 13, 16, 16, 16, 16, 18, 18, 18, 18, 18, 23,
23, 23, 23, 23, 23, 25, 25, 25, 25, 25, 25, 25, 27, 27, 27, 27,
27, 27, 27, 27, 29, 29, 29, 29, 29, 29, 29, 31, 31, 31, 31, 31,
31, 33, 33, 33, 33, 33, 36, 36, 36, 36, 38, 38, 38, 40, 40, 42, };
static const int kDefault8x8Inter[kH264ScalingList8x8Length] = {
9, 13, 13, 15, 13, 15, 17, 17, 17, 17, 19, 19, 19, 19, 19, 21,
21, 21, 21, 21, 21, 22, 22, 22, 22, 22, 22, 22, 24, 24, 24, 24,
24, 24, 24, 24, 25, 25, 25, 25, 25, 25, 25, 27, 27, 27, 27, 27,
27, 28, 28, 28, 28, 28, 30, 30, 30, 30, 32, 32, 32, 33, 33, 35, };
static inline void DefaultScalingList4x4(
int i,
int scaling_list4x4[][kH264ScalingList4x4Length]) {
DCHECK_LT(i, 6);
if (i < 3)
memcpy(scaling_list4x4[i], kDefault4x4Intra, sizeof(kDefault4x4Intra));
else if (i < 6)
memcpy(scaling_list4x4[i], kDefault4x4Inter, sizeof(kDefault4x4Inter));
}
static inline void DefaultScalingList8x8(
int i,
int scaling_list8x8[][kH264ScalingList8x8Length]) {
DCHECK_LT(i, 6);
if (i % 2 == 0)
memcpy(scaling_list8x8[i], kDefault8x8Intra, sizeof(kDefault8x8Intra));
else
memcpy(scaling_list8x8[i], kDefault8x8Inter, sizeof(kDefault8x8Inter));
}
static void FallbackScalingList4x4(
int i,
const int default_scaling_list_intra[],
const int default_scaling_list_inter[],
int scaling_list4x4[][kH264ScalingList4x4Length]) {
static const int kScalingList4x4ByteSize =
sizeof(scaling_list4x4[0][0]) * kH264ScalingList4x4Length;
switch (i) {
case 0:
memcpy(scaling_list4x4[i], default_scaling_list_intra,
kScalingList4x4ByteSize);
break;
case 1:
memcpy(scaling_list4x4[i], scaling_list4x4[0], kScalingList4x4ByteSize);
break;
case 2:
memcpy(scaling_list4x4[i], scaling_list4x4[1], kScalingList4x4ByteSize);
break;
case 3:
memcpy(scaling_list4x4[i], default_scaling_list_inter,
kScalingList4x4ByteSize);
break;
case 4:
memcpy(scaling_list4x4[i], scaling_list4x4[3], kScalingList4x4ByteSize);
break;
case 5:
memcpy(scaling_list4x4[i], scaling_list4x4[4], kScalingList4x4ByteSize);
break;
default:
NOTREACHED();
break;
}
}
static void FallbackScalingList8x8(
int i,
const int default_scaling_list_intra[],
const int default_scaling_list_inter[],
int scaling_list8x8[][kH264ScalingList8x8Length]) {
static const int kScalingList8x8ByteSize =
sizeof(scaling_list8x8[0][0]) * kH264ScalingList8x8Length;
switch (i) {
case 0:
memcpy(scaling_list8x8[i], default_scaling_list_intra,
kScalingList8x8ByteSize);
break;
case 1:
memcpy(scaling_list8x8[i], default_scaling_list_inter,
kScalingList8x8ByteSize);
break;
case 2:
memcpy(scaling_list8x8[i], scaling_list8x8[0], kScalingList8x8ByteSize);
break;
case 3:
memcpy(scaling_list8x8[i], scaling_list8x8[1], kScalingList8x8ByteSize);
break;
case 4:
memcpy(scaling_list8x8[i], scaling_list8x8[2], kScalingList8x8ByteSize);
break;
case 5:
memcpy(scaling_list8x8[i], scaling_list8x8[3], kScalingList8x8ByteSize);
break;
default:
NOTREACHED();
break;
}
}
H264Parser::Result H264Parser::ParseScalingList(int size,
int* scaling_list,
bool* use_default) {
// See chapter 7.3.2.1.1.1.
int last_scale = 8;
int next_scale = 8;
int delta_scale;
*use_default = false;
for (int j = 0; j < size; ++j) {
if (next_scale != 0) {
READ_SE_OR_RETURN(&delta_scale);
IN_RANGE_OR_RETURN(delta_scale, -128, 127);
next_scale = (last_scale + delta_scale + 256) & 0xff;
if (j == 0 && next_scale == 0) {
*use_default = true;
return kOk;
}
}
scaling_list[j] = (next_scale == 0) ? last_scale : next_scale;
last_scale = scaling_list[j];
}
return kOk;
}
H264Parser::Result H264Parser::ParseSPSScalingLists(H264SPS* sps) {
// See 7.4.2.1.1.
bool seq_scaling_list_present_flag;
bool use_default;
Result res;
// Parse scaling_list4x4.
for (int i = 0; i < 6; ++i) {
READ_BOOL_OR_RETURN(&seq_scaling_list_present_flag);
if (seq_scaling_list_present_flag) {
res = ParseScalingList(arraysize(sps->scaling_list4x4[i]),
sps->scaling_list4x4[i],
&use_default);
if (res != kOk)
return res;
if (use_default)
DefaultScalingList4x4(i, sps->scaling_list4x4);
} else {
FallbackScalingList4x4(
i, kDefault4x4Intra, kDefault4x4Inter, sps->scaling_list4x4);
}
}
// Parse scaling_list8x8.
for (int i = 0; i < ((sps->chroma_format_idc != 3) ? 2 : 6); ++i) {
READ_BOOL_OR_RETURN(&seq_scaling_list_present_flag);
if (seq_scaling_list_present_flag) {
res = ParseScalingList(arraysize(sps->scaling_list8x8[i]),
sps->scaling_list8x8[i],
&use_default);
if (res != kOk)
return res;
if (use_default)
DefaultScalingList8x8(i, sps->scaling_list8x8);
} else {
FallbackScalingList8x8(
i, kDefault8x8Intra, kDefault8x8Inter, sps->scaling_list8x8);
}
}
return kOk;
}
H264Parser::Result H264Parser::ParsePPSScalingLists(const H264SPS& sps,
H264PPS* pps) {
// See 7.4.2.2.
bool pic_scaling_list_present_flag;
bool use_default;
Result res;
for (int i = 0; i < 6; ++i) {
READ_BOOL_OR_RETURN(&pic_scaling_list_present_flag);
if (pic_scaling_list_present_flag) {
res = ParseScalingList(arraysize(pps->scaling_list4x4[i]),
pps->scaling_list4x4[i],
&use_default);
if (res != kOk)
return res;
if (use_default)
DefaultScalingList4x4(i, pps->scaling_list4x4);
} else {
if (sps.seq_scaling_matrix_present_flag) {
// Table 7-2 fallback rule A in spec.
FallbackScalingList4x4(
i, kDefault4x4Intra, kDefault4x4Inter, pps->scaling_list4x4);
} else {
// Table 7-2 fallback rule B in spec.
FallbackScalingList4x4(i,
sps.scaling_list4x4[0],
sps.scaling_list4x4[3],
pps->scaling_list4x4);
}
}
}
if (pps->transform_8x8_mode_flag) {
for (int i = 0; i < ((sps.chroma_format_idc != 3) ? 2 : 6); ++i) {
READ_BOOL_OR_RETURN(&pic_scaling_list_present_flag);
if (pic_scaling_list_present_flag) {
res = ParseScalingList(arraysize(pps->scaling_list8x8[i]),
pps->scaling_list8x8[i],
&use_default);
if (res != kOk)
return res;
if (use_default)
DefaultScalingList8x8(i, pps->scaling_list8x8);
} else {
if (sps.seq_scaling_matrix_present_flag) {
// Table 7-2 fallback rule A in spec.
FallbackScalingList8x8(
i, kDefault8x8Intra, kDefault8x8Inter, pps->scaling_list8x8);
} else {
// Table 7-2 fallback rule B in spec.
FallbackScalingList8x8(i,
sps.scaling_list8x8[0],
sps.scaling_list8x8[1],
pps->scaling_list8x8);
}
}
}
}
return kOk;
}
H264Parser::Result H264Parser::ParseAndIgnoreHRDParameters(
bool* hrd_parameters_present) {
int data;
READ_BOOL_OR_RETURN(&data); // {nal,vcl}_hrd_parameters_present_flag
if (!data)
return kOk;
*hrd_parameters_present = true;
int cpb_cnt_minus1;
READ_UE_OR_RETURN(&cpb_cnt_minus1);
IN_RANGE_OR_RETURN(cpb_cnt_minus1, 0, 31);
READ_BITS_OR_RETURN(8, &data); // bit_rate_scale, cpb_size_scale
for (int i = 0; i <= cpb_cnt_minus1; ++i) {
READ_UE_OR_RETURN(&data); // bit_rate_value_minus1[i]
READ_UE_OR_RETURN(&data); // cpb_size_value_minus1[i]
READ_BOOL_OR_RETURN(&data); // cbr_flag
}
READ_BITS_OR_RETURN(20, &data); // cpb/dpb delays, etc.
return kOk;
}
H264Parser::Result H264Parser::ParseVUIParameters(H264SPS* sps) {
bool aspect_ratio_info_present_flag;
READ_BOOL_OR_RETURN(&aspect_ratio_info_present_flag);
if (aspect_ratio_info_present_flag) {
int aspect_ratio_idc;
READ_BITS_OR_RETURN(8, &aspect_ratio_idc);
if (aspect_ratio_idc == H264SPS::kExtendedSar) {
READ_BITS_OR_RETURN(16, &sps->sar_width);
READ_BITS_OR_RETURN(16, &sps->sar_height);
} else {
const int max_aspect_ratio_idc = arraysize(kTableSarWidth) - 1;
IN_RANGE_OR_RETURN(aspect_ratio_idc, 0, max_aspect_ratio_idc);
sps->sar_width = kTableSarWidth[aspect_ratio_idc];
sps->sar_height = kTableSarHeight[aspect_ratio_idc];
}
}
int data;
// Read and ignore overscan and video signal type info.
READ_BOOL_OR_RETURN(&data); // overscan_info_present_flag
if (data)
READ_BOOL_OR_RETURN(&data); // overscan_appropriate_flag
READ_BOOL_OR_RETURN(&data); // video_signal_type_present_flag
if (data) {
READ_BITS_OR_RETURN(3, &data); // video_format
READ_BOOL_OR_RETURN(&data); // video_full_range_flag
READ_BOOL_OR_RETURN(&data); // colour_description_present_flag
if (data)
READ_BITS_OR_RETURN(24, &data); // color description syntax elements
}
READ_BOOL_OR_RETURN(&data); // chroma_loc_info_present_flag
if (data) {
READ_UE_OR_RETURN(&data); // chroma_sample_loc_type_top_field
READ_UE_OR_RETURN(&data); // chroma_sample_loc_type_bottom_field
}
// Read and ignore timing info.
READ_BOOL_OR_RETURN(&data); // timing_info_present_flag
if (data) {
READ_BITS_OR_RETURN(16, &data); // num_units_in_tick
READ_BITS_OR_RETURN(16, &data); // num_units_in_tick
READ_BITS_OR_RETURN(16, &data); // time_scale
READ_BITS_OR_RETURN(16, &data); // time_scale
READ_BOOL_OR_RETURN(&data); // fixed_frame_rate_flag
}
// Read and ignore NAL HRD parameters, if present.
bool hrd_parameters_present = false;
Result res = ParseAndIgnoreHRDParameters(&hrd_parameters_present);
if (res != kOk)
return res;
// Read and ignore VCL HRD parameters, if present.
res = ParseAndIgnoreHRDParameters(&hrd_parameters_present);
if (res != kOk)
return res;
if (hrd_parameters_present) // One of NAL or VCL params present is enough.
READ_BOOL_OR_RETURN(&data); // low_delay_hrd_flag
READ_BOOL_OR_RETURN(&data); // pic_struct_present_flag
READ_BOOL_OR_RETURN(&sps->bitstream_restriction_flag);
if (sps->bitstream_restriction_flag) {
READ_BOOL_OR_RETURN(&data); // motion_vectors_over_pic_boundaries_flag
READ_UE_OR_RETURN(&data); // max_bytes_per_pic_denom
READ_UE_OR_RETURN(&data); // max_bits_per_mb_denom
READ_UE_OR_RETURN(&data); // log2_max_mv_length_horizontal
READ_UE_OR_RETURN(&data); // log2_max_mv_length_vertical
READ_UE_OR_RETURN(&sps->max_num_reorder_frames);
READ_UE_OR_RETURN(&sps->max_dec_frame_buffering);
TRUE_OR_RETURN(sps->max_dec_frame_buffering >= sps->max_num_ref_frames);
IN_RANGE_OR_RETURN(
sps->max_num_reorder_frames, 0, sps->max_dec_frame_buffering);
}
return kOk;
}
static void FillDefaultSeqScalingLists(H264SPS* sps) {
for (int i = 0; i < 6; ++i)
for (int j = 0; j < kH264ScalingList4x4Length; ++j)
sps->scaling_list4x4[i][j] = 16;
for (int i = 0; i < 6; ++i)
for (int j = 0; j < kH264ScalingList8x8Length; ++j)
sps->scaling_list8x8[i][j] = 16;
}
H264Parser::Result H264Parser::ParseSPS(int* sps_id) {
// See 7.4.2.1.
int data;
Result res;
*sps_id = -1;
scoped_ptr<H264SPS> sps(new H264SPS());
READ_BITS_OR_RETURN(8, &sps->profile_idc);
READ_BOOL_OR_RETURN(&sps->constraint_set0_flag);
READ_BOOL_OR_RETURN(&sps->constraint_set1_flag);
READ_BOOL_OR_RETURN(&sps->constraint_set2_flag);
READ_BOOL_OR_RETURN(&sps->constraint_set3_flag);
READ_BOOL_OR_RETURN(&sps->constraint_set4_flag);
READ_BOOL_OR_RETURN(&sps->constraint_set5_flag);
READ_BITS_OR_RETURN(2, &data); // reserved_zero_2bits
READ_BITS_OR_RETURN(8, &sps->level_idc);
READ_UE_OR_RETURN(&sps->seq_parameter_set_id);
TRUE_OR_RETURN(sps->seq_parameter_set_id < 32);
if (sps->profile_idc == 100 || sps->profile_idc == 110 ||
sps->profile_idc == 122 || sps->profile_idc == 244 ||
sps->profile_idc == 44 || sps->profile_idc == 83 ||
sps->profile_idc == 86 || sps->profile_idc == 118 ||
sps->profile_idc == 128) {
READ_UE_OR_RETURN(&sps->chroma_format_idc);
TRUE_OR_RETURN(sps->chroma_format_idc < 4);
if (sps->chroma_format_idc == 3)
READ_BOOL_OR_RETURN(&sps->separate_colour_plane_flag);
READ_UE_OR_RETURN(&sps->bit_depth_luma_minus8);
TRUE_OR_RETURN(sps->bit_depth_luma_minus8 < 7);
READ_UE_OR_RETURN(&sps->bit_depth_chroma_minus8);
TRUE_OR_RETURN(sps->bit_depth_chroma_minus8 < 7);
READ_BOOL_OR_RETURN(&sps->qpprime_y_zero_transform_bypass_flag);
READ_BOOL_OR_RETURN(&sps->seq_scaling_matrix_present_flag);
if (sps->seq_scaling_matrix_present_flag) {
DVLOG(4) << "Scaling matrix present";
res = ParseSPSScalingLists(sps.get());
if (res != kOk)
return res;
} else {
FillDefaultSeqScalingLists(sps.get());
}
} else {
sps->chroma_format_idc = 1;
FillDefaultSeqScalingLists(sps.get());
}
if (sps->separate_colour_plane_flag)
sps->chroma_array_type = 0;
else
sps->chroma_array_type = sps->chroma_format_idc;
READ_UE_OR_RETURN(&sps->log2_max_frame_num_minus4);
TRUE_OR_RETURN(sps->log2_max_frame_num_minus4 < 13);
READ_UE_OR_RETURN(&sps->pic_order_cnt_type);
TRUE_OR_RETURN(sps->pic_order_cnt_type < 3);
sps->expected_delta_per_pic_order_cnt_cycle = 0;
if (sps->pic_order_cnt_type == 0) {
READ_UE_OR_RETURN(&sps->log2_max_pic_order_cnt_lsb_minus4);
TRUE_OR_RETURN(sps->log2_max_pic_order_cnt_lsb_minus4 < 13);
} else if (sps->pic_order_cnt_type == 1) {
READ_BOOL_OR_RETURN(&sps->delta_pic_order_always_zero_flag);
READ_SE_OR_RETURN(&sps->offset_for_non_ref_pic);
READ_SE_OR_RETURN(&sps->offset_for_top_to_bottom_field);
READ_UE_OR_RETURN(&sps->num_ref_frames_in_pic_order_cnt_cycle);
TRUE_OR_RETURN(sps->num_ref_frames_in_pic_order_cnt_cycle < 255);
for (int i = 0; i < sps->num_ref_frames_in_pic_order_cnt_cycle; ++i) {
READ_SE_OR_RETURN(&sps->offset_for_ref_frame[i]);
sps->expected_delta_per_pic_order_cnt_cycle +=
sps->offset_for_ref_frame[i];
}
}
READ_UE_OR_RETURN(&sps->max_num_ref_frames);
READ_BOOL_OR_RETURN(&sps->gaps_in_frame_num_value_allowed_flag);
READ_UE_OR_RETURN(&sps->pic_width_in_mbs_minus1);
READ_UE_OR_RETURN(&sps->pic_height_in_map_units_minus1);
READ_BOOL_OR_RETURN(&sps->frame_mbs_only_flag);
if (!sps->frame_mbs_only_flag)
READ_BOOL_OR_RETURN(&sps->mb_adaptive_frame_field_flag);
READ_BOOL_OR_RETURN(&sps->direct_8x8_inference_flag);
READ_BOOL_OR_RETURN(&sps->frame_cropping_flag);
if (sps->frame_cropping_flag) {
READ_UE_OR_RETURN(&sps->frame_crop_left_offset);
READ_UE_OR_RETURN(&sps->frame_crop_right_offset);
READ_UE_OR_RETURN(&sps->frame_crop_top_offset);
READ_UE_OR_RETURN(&sps->frame_crop_bottom_offset);
}
READ_BOOL_OR_RETURN(&sps->vui_parameters_present_flag);
if (sps->vui_parameters_present_flag) {
DVLOG(4) << "VUI parameters present";
res = ParseVUIParameters(sps.get());
if (res != kOk)
return res;
}
// If an SPS with the same id already exists, replace it.
*sps_id = sps->seq_parameter_set_id;
delete active_SPSes_[*sps_id];
active_SPSes_[*sps_id] = sps.release();
return kOk;
}
H264Parser::Result H264Parser::ParsePPS(int* pps_id) {
// See 7.4.2.2.
const H264SPS* sps;
Result res;
*pps_id = -1;
scoped_ptr<H264PPS> pps(new H264PPS());
READ_UE_OR_RETURN(&pps->pic_parameter_set_id);
READ_UE_OR_RETURN(&pps->seq_parameter_set_id);
TRUE_OR_RETURN(pps->seq_parameter_set_id < 32);
if (active_SPSes_.find(pps->seq_parameter_set_id) == active_SPSes_.end()) {
DVLOG(1) << "Invalid stream, no SPS id: " << pps->seq_parameter_set_id;
return kInvalidStream;
}
sps = GetSPS(pps->seq_parameter_set_id);
TRUE_OR_RETURN(sps);
READ_BOOL_OR_RETURN(&pps->entropy_coding_mode_flag);
READ_BOOL_OR_RETURN(&pps->bottom_field_pic_order_in_frame_present_flag);
READ_UE_OR_RETURN(&pps->num_slice_groups_minus1);
if (pps->num_slice_groups_minus1 > 1) {
DVLOG(1) << "Slice groups not supported";
return kUnsupportedStream;
}
READ_UE_OR_RETURN(&pps->num_ref_idx_l0_default_active_minus1);
TRUE_OR_RETURN(pps->num_ref_idx_l0_default_active_minus1 < 32);
READ_UE_OR_RETURN(&pps->num_ref_idx_l1_default_active_minus1);
TRUE_OR_RETURN(pps->num_ref_idx_l1_default_active_minus1 < 32);
READ_BOOL_OR_RETURN(&pps->weighted_pred_flag);
READ_BITS_OR_RETURN(2, &pps->weighted_bipred_idc);
TRUE_OR_RETURN(pps->weighted_bipred_idc < 3);
READ_SE_OR_RETURN(&pps->pic_init_qp_minus26);
IN_RANGE_OR_RETURN(pps->pic_init_qp_minus26, -26, 25);
READ_SE_OR_RETURN(&pps->pic_init_qs_minus26);
IN_RANGE_OR_RETURN(pps->pic_init_qs_minus26, -26, 25);
READ_SE_OR_RETURN(&pps->chroma_qp_index_offset);
IN_RANGE_OR_RETURN(pps->chroma_qp_index_offset, -12, 12);
pps->second_chroma_qp_index_offset = pps->chroma_qp_index_offset;
READ_BOOL_OR_RETURN(&pps->deblocking_filter_control_present_flag);
READ_BOOL_OR_RETURN(&pps->constrained_intra_pred_flag);
READ_BOOL_OR_RETURN(&pps->redundant_pic_cnt_present_flag);
if (br_.HasMoreRBSPData()) {
READ_BOOL_OR_RETURN(&pps->transform_8x8_mode_flag);
READ_BOOL_OR_RETURN(&pps->pic_scaling_matrix_present_flag);
if (pps->pic_scaling_matrix_present_flag) {
DVLOG(4) << "Picture scaling matrix present";
res = ParsePPSScalingLists(*sps, pps.get());
if (res != kOk)
return res;
}
READ_SE_OR_RETURN(&pps->second_chroma_qp_index_offset);
}
// If a PPS with the same id already exists, replace it.
*pps_id = pps->pic_parameter_set_id;
delete active_PPSes_[*pps_id];
active_PPSes_[*pps_id] = pps.release();
return kOk;
}
H264Parser::Result H264Parser::ParseRefPicListModification(
int num_ref_idx_active_minus1,
H264ModificationOfPicNum* ref_list_mods) {
H264ModificationOfPicNum* pic_num_mod;
if (num_ref_idx_active_minus1 >= 32)
return kInvalidStream;
for (int i = 0; i < 32; ++i) {
pic_num_mod = &ref_list_mods[i];
READ_UE_OR_RETURN(&pic_num_mod->modification_of_pic_nums_idc);
TRUE_OR_RETURN(pic_num_mod->modification_of_pic_nums_idc < 4);
switch (pic_num_mod->modification_of_pic_nums_idc) {
case 0:
case 1:
READ_UE_OR_RETURN(&pic_num_mod->abs_diff_pic_num_minus1);
break;
case 2:
READ_UE_OR_RETURN(&pic_num_mod->long_term_pic_num);
break;
case 3:
// Per spec, list cannot be empty.
if (i == 0)
return kInvalidStream;
return kOk;
default:
return kInvalidStream;
}
}
// If we got here, we didn't get loop end marker prematurely,
// so make sure it is there for our client.
int modification_of_pic_nums_idc;