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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 "media/video/h264_parser.h"
- #include <cstring>
- #include <limits>
- #include <memory>
- #include "base/logging.h"
- #include "base/notreached.h"
- #include "base/numerics/safe_math.h"
- #include "media/base/subsample_entry.h"
- #include "ui/gfx/geometry/rect.h"
- #include "ui/gfx/geometry/size.h"
- namespace media {
- namespace {
- // Converts [|start|, |end|) range with |encrypted_ranges| into a vector of
- // SubsampleEntry. |encrypted_ranges| must be with in the range defined by
- // |start| and |end|.
- // It is OK to pass in empty |encrypted_ranges|; this will return a vector
- // with single SubsampleEntry with clear_bytes set to the size of the buffer.
- std::vector<SubsampleEntry> EncryptedRangesToSubsampleEntry(
- const uint8_t* start,
- const uint8_t* end,
- const Ranges<const uint8_t*>& encrypted_ranges) {
- std::vector<SubsampleEntry> subsamples;
- const uint8_t* cur = start;
- for (size_t i = 0; i < encrypted_ranges.size(); ++i) {
- SubsampleEntry subsample = {};
- const uint8_t* encrypted_start = encrypted_ranges.start(i);
- DCHECK_GE(encrypted_start, cur)
- << "Encrypted range started before the current buffer pointer.";
- subsample.clear_bytes = encrypted_start - cur;
- const uint8_t* encrypted_end = encrypted_ranges.end(i);
- subsample.cypher_bytes = encrypted_end - encrypted_start;
- subsamples.push_back(subsample);
- cur = encrypted_end;
- DCHECK_LE(cur, end) << "Encrypted range is outside the buffer range.";
- }
- // If there is more data in the buffer but not covered by encrypted_ranges,
- // then it must be in the clear.
- if (cur < end) {
- SubsampleEntry subsample = {};
- subsample.clear_bytes = end - cur;
- subsamples.push_back(subsample);
- }
- return subsamples;
- }
- } // namespace
- 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));
- }
- // static
- void H264SPS::GetLevelConfigFromProfileLevel(VideoCodecProfile profile,
- uint8_t level,
- int* level_idc,
- bool* constraint_set3_flag) {
- // Spec A.3.1.
- // Note: we always use h264_output_level = 9 to indicate Level 1b in
- // VideoEncodeAccelerator::Config, in order to tell apart from Level 1.1
- // which level IDC is also 11.
- // For Baseline and Main profile, if requested level is Level 1b, set
- // level_idc to 11 and constraint_set3_flag to true. Otherwise, set level_idc
- // to 9 for Level 1b, and ten times level number for others.
- if ((profile == H264PROFILE_BASELINE || profile == H264PROFILE_MAIN) &&
- level == kLevelIDC1B) {
- *level_idc = 11;
- *constraint_set3_flag = true;
- } else {
- *level_idc = level;
- }
- }
- H264SPS::H264SPS() {
- memset(this, 0, sizeof(*this));
- }
- // Based on T-REC-H.264 7.4.2.1.1, "Sequence parameter set data semantics",
- // available from http://www.itu.int/rec/T-REC-H.264.
- absl::optional<gfx::Size> H264SPS::GetCodedSize() const {
- // Interlaced frames are twice the height of each field.
- const int mb_unit = 16;
- int map_unit = frame_mbs_only_flag ? 16 : 32;
- // Verify that the values are not too large before multiplying them.
- // TODO(sandersd): These limits could be much smaller. The currently-largest
- // specified limit (excluding SVC, multiview, etc., which I didn't bother to
- // read) is 543 macroblocks (section A.3.1).
- int max_mb_minus1 = std::numeric_limits<int>::max() / mb_unit - 1;
- int max_map_units_minus1 = std::numeric_limits<int>::max() / map_unit - 1;
- if (pic_width_in_mbs_minus1 > max_mb_minus1 ||
- pic_height_in_map_units_minus1 > max_map_units_minus1) {
- DVLOG(1) << "Coded size is too large.";
- return absl::nullopt;
- }
- return gfx::Size(mb_unit * (pic_width_in_mbs_minus1 + 1),
- map_unit * (pic_height_in_map_units_minus1 + 1));
- }
- // Also based on section 7.4.2.1.1.
- absl::optional<gfx::Rect> H264SPS::GetVisibleRect() const {
- absl::optional<gfx::Size> coded_size = GetCodedSize();
- if (!coded_size)
- return absl::nullopt;
- if (!frame_cropping_flag)
- return gfx::Rect(coded_size.value());
- int crop_unit_x;
- int crop_unit_y;
- if (chroma_array_type == 0) {
- crop_unit_x = 1;
- crop_unit_y = frame_mbs_only_flag ? 1 : 2;
- } else {
- // Section 6.2.
- // |chroma_format_idc| may be:
- // 1 => 4:2:0
- // 2 => 4:2:2
- // 3 => 4:4:4
- // Everything else has |chroma_array_type| == 0.
- int sub_width_c = chroma_format_idc > 2 ? 1 : 2;
- int sub_height_c = chroma_format_idc > 1 ? 1 : 2;
- crop_unit_x = sub_width_c;
- crop_unit_y = sub_height_c * (frame_mbs_only_flag ? 1 : 2);
- }
- // Verify that the values are not too large before multiplying.
- if (coded_size->width() / crop_unit_x < frame_crop_left_offset ||
- coded_size->width() / crop_unit_x < frame_crop_right_offset ||
- coded_size->height() / crop_unit_y < frame_crop_top_offset ||
- coded_size->height() / crop_unit_y < frame_crop_bottom_offset) {
- DVLOG(1) << "Frame cropping exceeds coded size.";
- return absl::nullopt;
- }
- int crop_left = crop_unit_x * frame_crop_left_offset;
- int crop_right = crop_unit_x * frame_crop_right_offset;
- int crop_top = crop_unit_y * frame_crop_top_offset;
- int crop_bottom = crop_unit_y * frame_crop_bottom_offset;
- // Verify that the values are sane. Note that some decoders also require that
- // crops are smaller than a macroblock and/or that crops must be adjacent to
- // at least one corner of the coded frame.
- if (coded_size->width() - crop_left <= crop_right ||
- coded_size->height() - crop_top <= crop_bottom) {
- DVLOG(1) << "Frame cropping excludes entire frame.";
- return absl::nullopt;
- }
- return gfx::Rect(crop_left, crop_top,
- coded_size->width() - crop_left - crop_right,
- coded_size->height() - crop_top - crop_bottom);
- }
- // Based on T-REC-H.264 E.2.1, "VUI parameters semantics",
- // available from http://www.itu.int/rec/T-REC-H.264.
- VideoColorSpace H264SPS::GetColorSpace() const {
- if (colour_description_present_flag) {
- return VideoColorSpace(
- colour_primaries, transfer_characteristics, matrix_coefficients,
- video_full_range_flag ? gfx::ColorSpace::RangeID::FULL
- : gfx::ColorSpace::RangeID::LIMITED);
- } else {
- return VideoColorSpace();
- }
- }
- VideoChromaSampling H264SPS::GetChromaSampling() const {
- // Spec section 6.2
- switch (chroma_format_idc) {
- case 0:
- return VideoChromaSampling::k400;
- case 1:
- return VideoChromaSampling::k420;
- case 2:
- return VideoChromaSampling::k422;
- case 3:
- return VideoChromaSampling::k444;
- default:
- DVLOG(1) << "Unknown chroma subsampling format.";
- return VideoChromaSampling::kUnknown;
- }
- }
- uint8_t H264SPS::GetIndicatedLevel() const {
- // Spec A.3.1 and A.3.2
- // For Baseline, Constrained Baseline and Main profile, the indicated level is
- // Level 1b if level_idc is equal to 11 and constraint_set3_flag is true.
- if ((profile_idc == H264SPS::kProfileIDCBaseline ||
- profile_idc == H264SPS::kProfileIDCConstrainedBaseline ||
- profile_idc == H264SPS::kProfileIDCMain) &&
- level_idc == 11 && constraint_set3_flag) {
- return kLevelIDC1B; // Level 1b
- }
- // Otherwise, the level_idc is equal to 9 for Level 1b, and others are equal
- // to values of ten times the level numbers.
- return base::checked_cast<uint8_t>(level_idc);
- }
- bool H264SPS::CheckIndicatedLevelWithinTarget(uint8_t target_level) const {
- // See table A-1 in spec.
- // Level 1.0 < 1b < 1.1 < 1.2 .... (in numeric order).
- uint8_t level = GetIndicatedLevel();
- if (target_level == kLevelIDC1p0)
- return level == kLevelIDC1p0;
- if (target_level == kLevelIDC1B)
- return level == kLevelIDC1p0 || level == kLevelIDC1B;
- return level <= target_level;
- }
- 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(std::size(kTableSarWidth) == std::size(kTableSarHeight),
- "sar tables must have the same size");
- H264Parser::H264Parser() {
- Reset();
- }
- H264Parser::~H264Parser() = default;
- void H264Parser::Reset() {
- stream_ = nullptr;
- bytes_left_ = 0;
- encrypted_ranges_.clear();
- previous_nalu_range_.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;
- previous_nalu_range_.clear();
- 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.get();
- }
- 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.get();
- }
- 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) {
- // The start code is "\0\0\1", ones are more unusual than zeroes, so let's
- // search for it first.
- const uint8_t* tmp =
- reinterpret_cast<const uint8_t*>(memchr(data + 2, 1, bytes_left - 2));
- if (!tmp) {
- data += bytes_left - 2;
- bytes_left = 2;
- break;
- }
- tmp -= 2;
- bytes_left -= tmp - data;
- data = tmp;
- 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;
- }
- // static
- 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;
- }
- // static
- VideoCodecProfile H264Parser::ProfileIDCToVideoCodecProfile(int profile_idc) {
- switch (profile_idc) {
- case H264SPS::kProfileIDCBaseline:
- return H264PROFILE_BASELINE;
- case H264SPS::kProfileIDCMain:
- return H264PROFILE_MAIN;
- case H264SPS::kProfileIDCHigh:
- return H264PROFILE_HIGH;
- case H264SPS::kProfileIDHigh10:
- return H264PROFILE_HIGH10PROFILE;
- case H264SPS::kProfileIDHigh422:
- return H264PROFILE_HIGH422PROFILE;
- case H264SPS::kProfileIDHigh444Predictive:
- return H264PROFILE_HIGH444PREDICTIVEPROFILE;
- case H264SPS::kProfileIDScalableBaseline:
- return H264PROFILE_SCALABLEBASELINE;
- case H264SPS::kProfileIDScalableHigh:
- return H264PROFILE_SCALABLEHIGH;
- case H264SPS::kProfileIDStereoHigh:
- return H264PROFILE_STEREOHIGH;
- case H264SPS::kProfileIDSMultiviewHigh:
- return H264PROFILE_MULTIVIEWHIGH;
- }
- DVLOG(1) << "unknown video profile: " << profile_idc;
- return VIDEO_CODEC_PROFILE_UNKNOWN;
- }
- // static
- bool H264Parser::ParseNALUs(const uint8_t* stream,
- size_t stream_size,
- std::vector<H264NALU>* nalus) {
- DCHECK(nalus);
- H264Parser parser;
- parser.SetStream(stream, stream_size);
- while (true) {
- H264NALU nalu;
- const H264Parser::Result result = parser.AdvanceToNextNALU(&nalu);
- if (result == H264Parser::kOk) {
- nalus->push_back(nalu);
- } else if (result == media::H264Parser::kEOStream) {
- return true;
- } else {
- DLOG(ERROR) << "Unexpected H264 parser result";
- return false;
- }
- }
- NOTREACHED();
- return false;
- }
- 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.
- // Special case for |num_bits| == 31 to avoid integer overflow. The only
- // valid representation as an int is 2^31 - 1, so the remaining bits must
- // be 0 or else the number is too large.
- *val = (1u << num_bits) - 1u;
- if (num_bits == 31) {
- READ_BITS_OR_RETURN(num_bits, &rest);
- return (rest == 0) ? kOk : kInvalidStream;
- }
- 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_;
- stream_ = nullptr;
- bytes_left_ = 0;
- 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)) {
- stream_ = nullptr;
- bytes_left_ = 0;
- 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);
- previous_nalu_range_.clear();
- previous_nalu_range_.Add(nalu->data, nalu->data + nalu->size);
- 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(std::size(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(std::size(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(std::size(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(std::size(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 = std::size(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(&sps->video_signal_type_present_flag);
- if (sps->video_signal_type_present_flag) {
- READ_BITS_OR_RETURN(3, &sps->video_format);
- READ_BOOL_OR_RETURN(&sps->video_full_range_flag);
- READ_BOOL_OR_RETURN(&sps->colour_description_present_flag);
- if (sps->colour_description_present_flag) {
- // color description syntax elements
- READ_BITS_OR_RETURN(8, &sps->colour_primaries);
- READ_BITS_OR_RETURN(8, &sps->transfer_characteristics);
- READ_BITS_OR_RETURN(8, &sps->matrix_coefficients);
- }
- }
- 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;
- 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(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);
- 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);
- sps->expected_delta_per_pic_order_cnt_cycle = 0;
- } 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);
- base::CheckedNumeric<int> offset_acc = 0;
- 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]);
- offset_acc += sps->offset_for_ref_frame[i];
- }
- if (!offset_acc.IsValid())
- return kInvalidStream;
- sps->expected_delta_per_pic_order_cnt_cycle = offset_acc.ValueOrDefault(0);
- }
- 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;
- active_SPSes_[*sps_id] = std::move(sps);
- return kOk;
- }
- H264Parser::Result H264Parser::ParsePPS(int* pps_id) {
- // See 7.4.2.2.
- const H264SPS* sps;
- Result res;
- *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);
- 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);
- bool pps_remainder_unencrypted = true;
- if (encrypted_ranges_.size()) {
- Ranges<const uint8_t*> pps_range;
- // Only check that the next byte is unencrypted, not the rest of the NALU.
- const uint8_t* next_byte =
- previous_nalu_range_.end(0) - br_.NumBitsLeft() / 8;
- pps_range.Add(next_byte, next_byte + 1);
- pps_remainder_unencrypted =
- (encrypted_ranges_.IntersectionWith(pps_range).size() == 0);
- }
- if (pps_remainder_unencrypted && 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;
- active_PPSes_[*pps_id] = std::move(pps);
- return kOk;
- }
- H264Parser::Result H264Parser::ParseSPSExt(int* sps_id) {
- // See 7.4.2.1.
- int local_sps_id = -1;
- *sps_id = -1;
- READ_UE_OR_RETURN(&local_sps_id);
- TRUE_OR_RETURN(local_sps_id < 32);
- *sps_id = local_sps_id;
- 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) {
- size_t bits_left_at_start = br_.NumBitsLeft();
- 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 < std::size(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 == std::size(shdr->ref_pic_marking)) {
- DVLOG(1) << "Ran out of dec ref pic marking fields";
- return kUnsupportedStream;
- }
- }
- }
- shdr->dec_ref_pic_marking_bit_size = bits_left_at_start - br_.NumBitsLeft();
- 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);
- size_t bits_left_at_pic_order_cnt_start = br_.NumBitsLeft();
- 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_cnt0);
- if (pps->bottom_field_pic_order_in_frame_present_flag &&
- !shdr->field_pic_flag)
- READ_SE_OR_RETURN(&shdr->delta_pic_order_cnt1);
- }
- shdr->pic_order_cnt_bit_size =
- bits_left_at_pic_order_cnt_start - br_.NumBitsLeft();
- 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.nal_unit_type == H264NALU::kCodedSliceExtension) {
- return kUnsupportedStream;
- } else {
- res = ParseRefPicListModifications(shdr);
- if (res != kOk)
- return res;
- }
- if ((pps->weighted_pred_flag && (shdr->IsPSlice() || shdr->IsSPSlice())) ||
- (pps->weighted_bipred_idc == 1 && shdr->IsBSlice())) {
- res = ParsePredWeightTable(*sps, shdr);
- if (res != kOk)
- return res;
- }
- if (nalu.nal_ref_idc != 0) {
- res = ParseDecRefPicMarking(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;
- }
- size_t epb = br_.NumEmulationPreventionBytesRead();
- shdr->header_bit_size = (shdr->nalu_size - epb) * 8 - br_.NumBitsLeft();
- return kOk;
- }
- H264Parser::Result H264Parser::ParseSEI(H264SEIMessage* sei_msg) {
- int byte;
- 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;
- }
- std::vector<SubsampleEntry> H264Parser::GetCurrentSubsamples() {
- DCHECK_EQ(previous_nalu_range_.size(), 1u)
- << "This should only be called after a "
- "successful call to AdvanceToNextNalu()";
- auto intersection = encrypted_ranges_.IntersectionWith(previous_nalu_range_);
- return EncryptedRangesToSubsampleEntry(
- previous_nalu_range_.start(0), previous_nalu_range_.end(0), intersection);
- }
- } // namespace media
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