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shaka-packager/packager/media/codecs/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 "packager/media/codecs/h264_parser.h"
#include <memory>
#include "packager/base/logging.h"
#include "packager/media/base/buffer_reader.h"
namespace shaka {
namespace media {
// Implemented according to ISO/IEC 14496-10:2005 7.4.2.1 Sequence parameter set
// RBSP semantics.
bool ExtractResolutionFromSps(const H264Sps& sps,
uint32_t* coded_width,
uint32_t* coded_height,
uint32_t* pixel_width,
uint32_t* pixel_height) {
int crop_x = 0;
int crop_y = 0;
if (sps.frame_cropping_flag) {
int sub_width_c = 0;
int sub_height_c = 0;
// Table 6-1.
switch (sps.chroma_format_idc) {
case 0: // monochrome
// SubWidthC and SubHeightC are not defined for monochrome. For ease of
// computation afterwards, assign both to 1.
sub_width_c = 1;
sub_height_c = 1;
break;
case 1: // 4:2:0
sub_width_c = 2;
sub_height_c = 2;
break;
case 2: // 4:2:2
sub_width_c = 2;
sub_height_c = 1;
break;
case 3: // 4:4:4
sub_width_c = 1;
sub_height_c = 1;
break;
default:
LOG(ERROR) << "Unexpected chroma_format_idc " << sps.chroma_format_idc;
return false;
}
// Formula 7-16, 7-17, 7-18, 7-19.
int crop_unit_x = sub_width_c;
int crop_unit_y = sub_height_c * (2 - (sps.frame_mbs_only_flag ? 1 : 0));
crop_x = crop_unit_x *
(sps.frame_crop_left_offset + sps.frame_crop_right_offset);
crop_y = crop_unit_y *
(sps.frame_crop_top_offset + sps.frame_crop_bottom_offset);
}
// Formula 7-10, 7-11.
int pic_width_in_mbs = sps.pic_width_in_mbs_minus1 + 1;
*coded_width = pic_width_in_mbs * 16 - crop_x;
// Formula 7-13, 7-15.
int pic_height_in_mbs = (2 - (sps.frame_mbs_only_flag ? 1 : 0)) *
(sps.pic_height_in_map_units_minus1 + 1);
*coded_height = pic_height_in_mbs * 16 - crop_y;
// 0 means it wasn't in the SPS and therefore assume 1.
*pixel_width = sps.sar_width == 0 ? 1 : sps.sar_width;
*pixel_height = sps.sar_height == 0 ? 1 : sps.sar_height;
DVLOG(2) << "Found coded_width: " << *coded_width
<< " coded_height: " << *coded_height
<< " pixel_width: " << *pixel_width
<< " pixel_height: " << *pixel_height;
return true;
}
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);
}
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 { \
if (!br->ReadBits(num_bits, (out))) { \
DVLOG(1) \
<< "Error in stream: unexpected EOS while trying to read " #out; \
return kInvalidStream; \
} \
} 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 (!br->ReadUE(out)) { \
DVLOG(1) << "Error in stream: invalid value while trying to read " #out; \
return kInvalidStream; \
} \
} while (0)
#define READ_SE_OR_RETURN(out) \
do { \
if (!br->ReadSE(out)) { \
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)
enum AspectRatioIdc {
kExtendedSar = 255,
};
// 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_same_size");
H264Parser::H264Parser() {}
H264Parser::~H264Parser() {}
const H264Pps* H264Parser::GetPps(int pps_id) {
return active_PPSes_[pps_id].get();
}
const H264Sps* H264Parser::GetSps(int sps_id) {
return active_SPSes_[sps_id].get();
}
// 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(H26xBitReader* br,
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(H26xBitReader* br,
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(br,
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(br,
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(H26xBitReader* br,
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(br,
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(br,
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(
H26xBitReader* br, 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(H26xBitReader* br,
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 == 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(br, &hrd_parameters_present);
if (res != kOk)
return res;
// Read and ignore VCL HRD parameters, if present.
res = ParseAndIgnoreHRDParameters(br, &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(const Nalu& nalu, int* sps_id) {
// See 7.4.2.1.
int data;
Result res;
H26xBitReader reader;
reader.Initialize(nalu.data() + nalu.header_size(), nalu.payload_size());
H26xBitReader* br = &reader;
*sps_id = -1;
std::unique_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(br, 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(br, 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;
active_SPSes_[*sps_id] = std::move(sps);
return kOk;
}
H264Parser::Result H264Parser::ParsePps(const Nalu& nalu, int* pps_id) {
// See 7.4.2.2.
const H264Sps* sps;
Result res;
H26xBitReader reader;
reader.Initialize(nalu.data() + nalu.header_size(), nalu.payload_size());
H26xBitReader* br = &reader;
*pps_id = -1;
std::unique_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(br, *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;
active_PPSes_[*pps_id] = std::move(pps);
return kOk;
}
H264Parser::Result H264Parser::ParseRefPicListModification(
H26xBitReader* br,
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(
H26xBitReader* br, 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(br, 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(br, shdr->num_ref_idx_l1_active_minus1,
shdr->ref_list_l1_modifications);
if (res != kOk)
return res;
}
}
return kOk;
}
H264Parser::Result H264Parser::ParseWeightingFactors(
H26xBitReader* br,
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[i]);
if (w_facts->luma_weight_flag[i]) {
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[i]);
if (w_facts->chroma_weight_flag[i]) {
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(H26xBitReader* br,
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(br,
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(br,
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(H26xBitReader* br,
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 Nalu& nalu,
H264SliceHeader* shdr) {
// See 7.4.3.
const H264Sps* sps;
const H264Pps* pps;
Result res;
H26xBitReader reader;
reader.Initialize(nalu.data() + nalu.header_size(), nalu.payload_size());
H26xBitReader* br = &reader;
memset(shdr, 0, sizeof(*shdr));
shdr->idr_pic_flag = (nalu.type() == 5);
shdr->nal_ref_idc = nalu.ref_idc();
shdr->nalu_data = nalu.data();
shdr->nalu_size = nalu.header_size() + nalu.payload_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 &&
!shdr->field_pic_flag)
READ_SE_OR_RETURN(&shdr->delta_pic_order_cnt[1]);
}
if (pps->redundant_pic_cnt_present_flag) {
READ_UE_OR_RETURN(&shdr->redundant_pic_cnt);
TRUE_OR_RETURN(shdr->redundant_pic_cnt < 128);
}
if (shdr->IsBSlice())
READ_BOOL_OR_RETURN(&shdr->direct_spatial_mv_pred_flag);
if (shdr->IsPSlice() || shdr->IsSPSlice() || shdr->IsBSlice()) {
READ_BOOL_OR_RETURN(&shdr->num_ref_idx_active_override_flag);
if (shdr->num_ref_idx_active_override_flag) {
READ_UE_OR_RETURN(&shdr->num_ref_idx_l0_active_minus1);
if (shdr->IsBSlice())
READ_UE_OR_RETURN(&shdr->num_ref_idx_l1_active_minus1);
} else {
shdr->num_ref_idx_l0_active_minus1 =
pps->num_ref_idx_l0_default_active_minus1;
if (shdr->IsBSlice()) {
shdr->num_ref_idx_l1_active_minus1 =
pps->num_ref_idx_l1_default_active_minus1;
}
}
}
if (shdr->field_pic_flag) {
TRUE_OR_RETURN(shdr->num_ref_idx_l0_active_minus1 < 32);
TRUE_OR_RETURN(shdr->num_ref_idx_l1_active_minus1 < 32);
} else {
TRUE_OR_RETURN(shdr->num_ref_idx_l0_active_minus1 < 16);
TRUE_OR_RETURN(shdr->num_ref_idx_l1_active_minus1 < 16);
}
if (nalu.type() == Nalu::H264_CodedSliceExtension) {
return kUnsupportedStream;
} else {
res = ParseRefPicListModifications(br, shdr);
if (res != kOk)
return res;
}
if ((pps->weighted_pred_flag && (shdr->IsPSlice() || shdr->IsSPSlice())) ||
(pps->weighted_bipred_idc == 1 && shdr->IsBSlice())) {
res = ParsePredWeightTable(br, *sps, shdr);
if (res != kOk)
return res;
}
if (nalu.ref_idc() != 0) {
res = ParseDecRefPicMarking(br, shdr);
if (res != kOk)
return res;
}
if (pps->entropy_coding_mode_flag && !shdr->IsISlice() &&
!shdr->IsSISlice()) {
READ_UE_OR_RETURN(&shdr->cabac_init_idc);
TRUE_OR_RETURN(shdr->cabac_init_idc < 3);
}
READ_SE_OR_RETURN(&shdr->slice_qp_delta);
if (shdr->IsSPSlice() || shdr->IsSISlice()) {
if (shdr->IsSPSlice())
READ_BOOL_OR_RETURN(&shdr->sp_for_switch_flag);
READ_SE_OR_RETURN(&shdr->slice_qs_delta);
}
if (pps->deblocking_filter_control_present_flag) {
READ_UE_OR_RETURN(&shdr->disable_deblocking_filter_idc);
TRUE_OR_RETURN(shdr->disable_deblocking_filter_idc < 3);
if (shdr->disable_deblocking_filter_idc != 1) {
READ_SE_OR_RETURN(&shdr->slice_alpha_c0_offset_div2);
IN_RANGE_OR_RETURN(shdr->slice_alpha_c0_offset_div2, -6, 6);
READ_SE_OR_RETURN(&shdr->slice_beta_offset_div2);
IN_RANGE_OR_RETURN(shdr->slice_beta_offset_div2, -6, 6);
}
}
if (pps->num_slice_groups_minus1 > 0) {
DVLOG(1) << "Slice groups not supported";
return kUnsupportedStream;
}
shdr->header_bit_size = nalu.payload_size() * 8 - br->NumBitsLeft();
return kOk;
}
H264Parser::Result H264Parser::ParseSEI(const Nalu& nalu,
H264SEIMessage* sei_msg) {
int byte;
H26xBitReader reader;
reader.Initialize(nalu.data() + nalu.header_size(), nalu.payload_size());
H26xBitReader* br = &reader;
memset(sei_msg, 0, sizeof(*sei_msg));
READ_BITS_OR_RETURN(8, &byte);
while (byte == 0xff) {
sei_msg->type += 255;
READ_BITS_OR_RETURN(8, &byte);
}
sei_msg->type += byte;
READ_BITS_OR_RETURN(8, &byte);
while (byte == 0xff) {
sei_msg->payload_size += 255;
READ_BITS_OR_RETURN(8, &byte);
}
sei_msg->payload_size += byte;
DVLOG(4) << "Found SEI message type: " << sei_msg->type
<< " payload size: " << sei_msg->payload_size;
switch (sei_msg->type) {
case H264SEIMessage::kSEIRecoveryPoint:
READ_UE_OR_RETURN(&sei_msg->recovery_point.recovery_frame_cnt);
READ_BOOL_OR_RETURN(&sei_msg->recovery_point.exact_match_flag);
READ_BOOL_OR_RETURN(&sei_msg->recovery_point.broken_link_flag);
READ_BITS_OR_RETURN(2, &sei_msg->recovery_point.changing_slice_group_idc);
break;
default:
DVLOG(4) << "Unsupported SEI message";
break;
}
return kOk;
}
} // namespace media
} // namespace shaka
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