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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/memory/scoped_ptr.h"
#include "base/stl_util.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)
H264Parser::H264Parser() {
Reset();
}
H264Parser::~H264Parser() {
STLDeleteValues(&active_SPSes_);
STLDeleteValues(&active_PPSes_);
}
void H264Parser::Reset() {
stream_ = NULL;
bytes_left_ = 0;
}
void H264Parser::SetStream(const uint8* stream, off_t stream_size) {
DCHECK(stream);
DCHECK_GT(stream_size, 0);
stream_ = stream;
bytes_left_ = stream_size;
}
const H264PPS* H264Parser::GetPPS(int pps_id) {
return active_PPSes_[pps_id];
}
const H264SPS* H264Parser::GetSPS(int sps_id) {
return active_SPSes_[sps_id];
}
static inline bool IsStartCode(const uint8* data) {
return data[0] == 0x00 && data[1] == 0x00 && data[2] == 0x01;
}
// Find offset from start of data to next NALU start code
// and size of found start code (3 or 4 bytes).
static bool FindStartCode(const uint8* data, off_t data_size,
off_t* offset,
off_t* start_code_size) {
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.
return false;
}
// Find the next NALU in stream, returning its start offset without the start
// code (i.e. at the beginning of NALU data).
// Size will include trailing zero bits, and will be from start offset to
// before the start code of the next NALU (or end of stream).
static bool LocateNALU(const uint8* stream, off_t stream_size,
off_t* nalu_start_off, off_t* nalu_size) {
off_t start_code_size;
// Find start code of the next NALU.
if (!FindStartCode(stream, stream_size, nalu_start_off, &start_code_size)) {
DVLOG(4) << "Could not find start code, end of stream?";
return false;
}
// Discard its start code.
*nalu_start_off += start_code_size;
// Move the stream to the beginning of it (skip the start code).
stream_size -= *nalu_start_off;
stream += *nalu_start_off;
// Find the start code of next NALU; if successful, NALU size 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 if there
// are still some bytes left after the first start code.
// nalu_size is the offset to the next start code
if (!FindStartCode(stream, stream_size, nalu_size, &start_code_size)) {
// end of stream (no next NALU), but still valid NALU if any bytes left
*nalu_size = stream_size;
if (*nalu_size < 1) {
DVLOG(3) << "End of stream";
return false;
}
}
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) {
int data;
off_t off_to_nalu_start;
if (!LocateNALU(stream_, bytes_left_, &off_to_nalu_start, &nalu->size)) {
DVLOG(4) << "Could not find next NALU, bytes left in stream: "
<< bytes_left_;
return kEOStream;
}
nalu->data = stream_ + off_to_nalu_start;
// Initialize bit reader at the start of found NALU.
if (!br_.Initialize(nalu->data, nalu->size))
return kEOStream;
DVLOG(4) << "Looking for NALU, Stream bytes left: " << bytes_left_
<< " off to next nalu: " << off_to_nalu_start;
// 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_ += off_to_nalu_start + nalu->size;
bytes_left_ -= off_to_nalu_start + nalu->size;
// Read NALU header, skip the forbidden_zero_bit, but check for it.
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;
}
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_BITS_OR_RETURN(6, &sps->constraint_setx_flag);
READ_BITS_OR_RETURN(2, &data);
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);
if (sps->gaps_in_frame_num_value_allowed_flag)
return kUnsupportedStream;
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(1) << "VUI parameters present in SPS, ignoring";
}
// 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);
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;
READ_UE_OR_RETURN(&modification_of_pic_nums_idc);
TRUE_OR_RETURN(modification_of_pic_nums_idc == 3);
return kOk;
}
H264Parser::Result H264Parser::ParseRefPicListModifications(
H264SliceHeader* shdr) {
Result res;
if (!shdr->IsISlice() && !shdr->IsSISlice()) {
READ_BOOL_OR_RETURN(&shdr->ref_pic_list_modification_flag_l0);
if (shdr->ref_pic_list_modification_flag_l0) {
res = ParseRefPicListModification(shdr->num_ref_idx_l0_active_minus1,
shdr->ref_list_l0_modifications);
if (res != kOk)
return res;
}
}
if (shdr->IsBSlice()) {
READ_BOOL_OR_RETURN(&shdr->ref_pic_list_modification_flag_l1);
if (shdr->ref_pic_list_modification_flag_l1) {
res = ParseRefPicListModification(shdr->num_ref_idx_l1_active_minus1,
shdr->ref_list_l1_modifications);
if (res != kOk)
return res;
}
}
return kOk;
}
H264Parser::Result H264Parser::ParseWeightingFactors(
int num_ref_idx_active_minus1,
int chroma_array_type,
int luma_log2_weight_denom,
int chroma_log2_weight_denom,
H264WeightingFactors* w_facts) {
int def_luma_weight = 1 << luma_log2_weight_denom;
int def_chroma_weight = 1 << chroma_log2_weight_denom;
for (int i = 0; i < num_ref_idx_active_minus1 + 1; ++i) {
READ_BOOL_OR_RETURN(&w_facts->luma_weight_flag);
if (w_facts->luma_weight_flag) {
READ_SE_OR_RETURN(&w_facts->luma_weight[i]);
IN_RANGE_OR_RETURN(w_facts->luma_weight[i], -128, 127);
READ_SE_OR_RETURN(&w_facts->luma_offset[i]);
IN_RANGE_OR_RETURN(w_facts->luma_offset[i], -128, 127);
} else {
w_facts->luma_weight[i] = def_luma_weight;
w_facts->luma_offset[i] = 0;
}
if (chroma_array_type != 0) {
READ_BOOL_OR_RETURN(&w_facts->chroma_weight_flag);
if (w_facts->chroma_weight_flag) {
for (int j = 0; j < 2; ++j) {
READ_SE_OR_RETURN(&w_facts->chroma_weight[i][j]);
IN_RANGE_OR_RETURN(w_facts->chroma_weight[i][j], -128, 127);
READ_SE_OR_RETURN(&w_facts->chroma_offset[i][j]);
IN_RANGE_OR_RETURN(w_facts->chroma_offset[i][j], -128, 127);
}
} else {
for (int j = 0; j < 2; ++j) {
w_facts->chroma_weight[i][j] = def_chroma_weight;
w_facts->chroma_offset[i][j] = 0;
}
}
}
}
return kOk;
}
H264Parser::Result H264Parser::ParsePredWeightTable(const H264SPS& sps,
H264SliceHeader* shdr) {
READ_UE_OR_RETURN(&shdr->luma_log2_weight_denom);
TRUE_OR_RETURN(shdr->luma_log2_weight_denom < 8);
if (sps.chroma_array_type != 0)
READ_UE_OR_RETURN(&shdr->chroma_log2_weight_denom);
TRUE_OR_RETURN(shdr->chroma_log2_weight_denom < 8);
Result res = ParseWeightingFactors(shdr->num_ref_idx_l0_active_minus1,
sps.chroma_array_type,
shdr->luma_log2_weight_denom,
shdr->chroma_log2_weight_denom,
&shdr->pred_weight_table_l0);
if (res != kOk)
return res;
if (shdr->IsBSlice()) {
res = ParseWeightingFactors(shdr->num_ref_idx_l1_active_minus1,
sps.chroma_array_type,
shdr->luma_log2_weight_denom,
shdr->chroma_log2_weight_denom,
&shdr->pred_weight_table_l1);
if (res != kOk)
return res;
}
return kOk;
}
H264Parser::Result H264Parser::ParseDecRefPicMarking(H264SliceHeader* shdr) {
if (shdr->idr_pic_flag) {
READ_BOOL_OR_RETURN(&shdr->no_output_of_prior_pics_flag);
READ_BOOL_OR_RETURN(&shdr->long_term_reference_flag);
} else {
READ_BOOL_OR_RETURN(&shdr->adaptive_ref_pic_marking_mode_flag);
H264DecRefPicMarking* marking;
if (shdr->adaptive_ref_pic_marking_mode_flag) {
size_t i;
for (i = 0; i < arraysize(shdr->ref_pic_marking); ++i) {
marking = &shdr->ref_pic_marking[i];
READ_UE_OR_RETURN(&marking->memory_mgmnt_control_operation);
if (marking->memory_mgmnt_control_operation == 0)
break;
if (marking->memory_mgmnt_control_operation == 1 ||
marking->memory_mgmnt_control_operation == 3)
READ_UE_OR_RETURN(&marking->difference_of_pic_nums_minus1);
if (marking->memory_mgmnt_control_operation == 2)
READ_UE_OR_RETURN(&marking->long_term_pic_num);
if (marking->memory_mgmnt_control_operation == 3 ||
marking->memory_mgmnt_control_operation == 6)
READ_UE_OR_RETURN(&marking->long_term_frame_idx);
if (marking->memory_mgmnt_control_operation == 4)
READ_UE_OR_RETURN(&marking->max_long_term_frame_idx_plus1);
if (marking->memory_mgmnt_control_operation > 6)
return kInvalidStream;
}
if (i == arraysize(shdr->ref_pic_marking)) {
DVLOG(1) << "Ran out of dec ref pic marking fields";
return kUnsupportedStream;
}
}
}
return kOk;
}
H264Parser::Result H264Parser::ParseSliceHeader(const H264NALU& nalu,
H264SliceHeader* shdr) {
// See 7.4.3.
const H264SPS* sps;
const H264PPS* pps;
Result res;
memset(shdr, 0, sizeof(*shdr));
shdr->idr_pic_flag = (nalu.nal_unit_type == 5);
shdr->nal_ref_idc = nalu.nal_ref_idc;
shdr->nalu_data = nalu.data;
shdr->nalu_size = nalu.size;
READ_UE_OR_RETURN(&shdr->first_mb_in_slice);
READ_UE_OR_RETURN(&shdr->slice_type);
TRUE_OR_RETURN(shdr->slice_type < 10);
READ_UE_OR_RETURN(&shdr->pic_parameter_set_id);
pps = GetPPS(shdr->pic_parameter_set_id);
TRUE_OR_RETURN(pps);
sps = GetSPS(pps->seq_parameter_set_id);
TRUE_OR_RETURN(sps);
if (sps->separate_colour_plane_flag) {
DVLOG(1) << "Interlaced streams not supported";
return kUnsupportedStream;
}
READ_BITS_OR_RETURN(sps->log2_max_frame_num_minus4 + 4, &shdr->frame_num);
if (!sps->frame_mbs_only_flag) {
READ_BOOL_OR_RETURN(&shdr->field_pic_flag);
if (shdr->field_pic_flag) {
DVLOG(1) << "Interlaced streams not supported";
return kUnsupportedStream;
}
}
if (shdr->idr_pic_flag)
READ_UE_OR_RETURN(&shdr->idr_pic_id);
if (sps->pic_order_cnt_type == 0) {
READ_BITS_OR_RETURN(sps->log2_max_pic_order_cnt_lsb_minus4 + 4,
&shdr->pic_order_cnt_lsb);
if (pps->bottom_field_pic_order_in_frame_present_flag &&
!shdr->field_pic_flag)
READ_SE_OR_RETURN(&shdr->delta_pic_order_cnt_bottom);
}
if (sps->pic_order_cnt_type == 1 && !sps->delta_pic_order_always_zero_flag) {
READ_SE_OR_RETURN(&shdr->delta_pic_order_cnt[0]);
if (pps->bottom_field_pic_order_in_frame_present_flag &&