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Unified Diff: webrtc/modules/video_coding/utility/h264_bitstream_parser.cc

Issue 2370853005: Move bitstream parser to more appropriate directory. (Closed)
Patch Set: remove moved files from gyp file Created 4 years, 2 months ago
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Index: webrtc/modules/video_coding/utility/h264_bitstream_parser.cc
diff --git a/webrtc/modules/video_coding/utility/h264_bitstream_parser.cc b/webrtc/modules/video_coding/utility/h264_bitstream_parser.cc
deleted file mode 100644
index 97cd0038695ca5f30fe4bccb48b32b1392b02b67..0000000000000000000000000000000000000000
--- a/webrtc/modules/video_coding/utility/h264_bitstream_parser.cc
+++ /dev/null
@@ -1,293 +0,0 @@
-/*
- * Copyright (c) 2015 The WebRTC project authors. All Rights Reserved.
- *
- * Use of this source code is governed by a BSD-style license
- * that can be found in the LICENSE file in the root of the source
- * tree. An additional intellectual property rights grant can be found
- * in the file PATENTS. All contributing project authors may
- * be found in the AUTHORS file in the root of the source tree.
- */
-#include "webrtc/modules/video_coding/utility/h264_bitstream_parser.h"
-
-#include <memory>
-#include <vector>
-
-#include "webrtc/base/bitbuffer.h"
-#include "webrtc/base/bytebuffer.h"
-#include "webrtc/base/checks.h"
-
-#include "webrtc/common_video/h264/h264_common.h"
-#include "webrtc/base/logging.h"
-
-namespace webrtc {
-
-#define RETURN_FALSE_ON_FAIL(x) \
- if (!(x)) { \
- LOG_F(LS_ERROR) << "FAILED: " #x; \
- return false; \
- }
-
-H264BitstreamParser::H264BitstreamParser() {}
-H264BitstreamParser::~H264BitstreamParser() {}
-
-bool H264BitstreamParser::ParseNonParameterSetNalu(const uint8_t* source,
- size_t source_length,
- uint8_t nalu_type) {
- RTC_CHECK(sps_);
- RTC_CHECK(pps_);
- last_slice_qp_delta_ = rtc::Optional<int32_t>();
- std::unique_ptr<rtc::Buffer> slice_rbsp(
- H264::ParseRbsp(source, source_length));
- rtc::BitBuffer slice_reader(slice_rbsp->data() + H264::kNaluTypeSize,
- slice_rbsp->size() - H264::kNaluTypeSize);
- // Check to see if this is an IDR slice, which has an extra field to parse
- // out.
- bool is_idr = (source[0] & 0x0F) == H264::NaluType::kIdr;
- uint8_t nal_ref_idc = (source[0] & 0x60) >> 5;
- uint32_t golomb_tmp;
- uint32_t bits_tmp;
-
- // first_mb_in_slice: ue(v)
- RETURN_FALSE_ON_FAIL(slice_reader.ReadExponentialGolomb(&golomb_tmp));
- // slice_type: ue(v)
- uint32_t slice_type;
- RETURN_FALSE_ON_FAIL(slice_reader.ReadExponentialGolomb(&slice_type));
- // slice_type's 5..9 range is used to indicate that all slices of a picture
- // have the same value of slice_type % 5, we don't care about that, so we map
- // to the corresponding 0..4 range.
- slice_type %= 5;
- // pic_parameter_set_id: ue(v)
- RETURN_FALSE_ON_FAIL(slice_reader.ReadExponentialGolomb(&golomb_tmp));
- if (sps_->separate_colour_plane_flag == 1) {
- // colour_plane_id
- RETURN_FALSE_ON_FAIL(slice_reader.ReadBits(&bits_tmp, 2));
- }
- // frame_num: u(v)
- // Represented by log2_max_frame_num_minus4 + 4 bits.
- RETURN_FALSE_ON_FAIL(
- slice_reader.ReadBits(&bits_tmp, sps_->log2_max_frame_num_minus4 + 4));
- uint32_t field_pic_flag = 0;
- if (sps_->frame_mbs_only_flag == 0) {
- // field_pic_flag: u(1)
- RETURN_FALSE_ON_FAIL(slice_reader.ReadBits(&field_pic_flag, 1));
- if (field_pic_flag != 0) {
- // bottom_field_flag: u(1)
- RETURN_FALSE_ON_FAIL(slice_reader.ReadBits(&bits_tmp, 1));
- }
- }
- if (is_idr) {
- // idr_pic_id: ue(v)
- RETURN_FALSE_ON_FAIL(slice_reader.ReadExponentialGolomb(&golomb_tmp));
- }
- // pic_order_cnt_lsb: u(v)
- // Represented by sps_.log2_max_pic_order_cnt_lsb_minus4 + 4 bits.
- if (sps_->pic_order_cnt_type == 0) {
- RETURN_FALSE_ON_FAIL(slice_reader.ReadBits(
- &bits_tmp, sps_->log2_max_pic_order_cnt_lsb_minus4 + 4));
- if (pps_->bottom_field_pic_order_in_frame_present_flag &&
- field_pic_flag == 0) {
- // delta_pic_order_cnt_bottom: se(v)
- RETURN_FALSE_ON_FAIL(slice_reader.ReadExponentialGolomb(&golomb_tmp));
- }
- }
- if (sps_->pic_order_cnt_type == 1 &&
- !sps_->delta_pic_order_always_zero_flag) {
- // delta_pic_order_cnt[0]: se(v)
- RETURN_FALSE_ON_FAIL(slice_reader.ReadExponentialGolomb(&golomb_tmp));
- if (pps_->bottom_field_pic_order_in_frame_present_flag && !field_pic_flag) {
- // delta_pic_order_cnt[1]: se(v)
- RETURN_FALSE_ON_FAIL(slice_reader.ReadExponentialGolomb(&golomb_tmp));
- }
- }
- if (pps_->redundant_pic_cnt_present_flag) {
- // redundant_pic_cnt: ue(v)
- RETURN_FALSE_ON_FAIL(slice_reader.ReadExponentialGolomb(&golomb_tmp));
- }
- if (slice_type == H264::SliceType::kB) {
- // direct_spatial_mv_pred_flag: u(1)
- RETURN_FALSE_ON_FAIL(slice_reader.ReadBits(&bits_tmp, 1));
- }
- switch (slice_type) {
- case H264::SliceType::kP:
- case H264::SliceType::kB:
- case H264::SliceType::kSp:
- uint32_t num_ref_idx_active_override_flag;
- // num_ref_idx_active_override_flag: u(1)
- RETURN_FALSE_ON_FAIL(
- slice_reader.ReadBits(&num_ref_idx_active_override_flag, 1));
- if (num_ref_idx_active_override_flag != 0) {
- // num_ref_idx_l0_active_minus1: ue(v)
- RETURN_FALSE_ON_FAIL(slice_reader.ReadExponentialGolomb(&golomb_tmp));
- if (slice_type == H264::SliceType::kB) {
- // num_ref_idx_l1_active_minus1: ue(v)
- RETURN_FALSE_ON_FAIL(slice_reader.ReadExponentialGolomb(&golomb_tmp));
- }
- }
- break;
- default:
- break;
- }
- // assume nal_unit_type != 20 && nal_unit_type != 21:
- RTC_CHECK_NE(nalu_type, 20);
- RTC_CHECK_NE(nalu_type, 21);
- // if (nal_unit_type == 20 || nal_unit_type == 21)
- // ref_pic_list_mvc_modification()
- // else
- {
- // ref_pic_list_modification():
- // |slice_type| checks here don't use named constants as they aren't named
- // in the spec for this segment. Keeping them consistent makes it easier to
- // verify that they are both the same.
- if (slice_type % 5 != 2 && slice_type % 5 != 4) {
- // ref_pic_list_modification_flag_l0: u(1)
- uint32_t ref_pic_list_modification_flag_l0;
- RETURN_FALSE_ON_FAIL(
- slice_reader.ReadBits(&ref_pic_list_modification_flag_l0, 1));
- if (ref_pic_list_modification_flag_l0) {
- uint32_t modification_of_pic_nums_idc;
- do {
- // modification_of_pic_nums_idc: ue(v)
- RETURN_FALSE_ON_FAIL(slice_reader.ReadExponentialGolomb(
- &modification_of_pic_nums_idc));
- if (modification_of_pic_nums_idc == 0 ||
- modification_of_pic_nums_idc == 1) {
- // abs_diff_pic_num_minus1: ue(v)
- RETURN_FALSE_ON_FAIL(
- slice_reader.ReadExponentialGolomb(&golomb_tmp));
- } else if (modification_of_pic_nums_idc == 2) {
- // long_term_pic_num: ue(v)
- RETURN_FALSE_ON_FAIL(
- slice_reader.ReadExponentialGolomb(&golomb_tmp));
- }
- } while (modification_of_pic_nums_idc != 3);
- }
- }
- if (slice_type % 5 == 1) {
- // ref_pic_list_modification_flag_l1: u(1)
- uint32_t ref_pic_list_modification_flag_l1;
- RETURN_FALSE_ON_FAIL(
- slice_reader.ReadBits(&ref_pic_list_modification_flag_l1, 1));
- if (ref_pic_list_modification_flag_l1) {
- uint32_t modification_of_pic_nums_idc;
- do {
- // modification_of_pic_nums_idc: ue(v)
- RETURN_FALSE_ON_FAIL(slice_reader.ReadExponentialGolomb(
- &modification_of_pic_nums_idc));
- if (modification_of_pic_nums_idc == 0 ||
- modification_of_pic_nums_idc == 1) {
- // abs_diff_pic_num_minus1: ue(v)
- RETURN_FALSE_ON_FAIL(
- slice_reader.ReadExponentialGolomb(&golomb_tmp));
- } else if (modification_of_pic_nums_idc == 2) {
- // long_term_pic_num: ue(v)
- RETURN_FALSE_ON_FAIL(
- slice_reader.ReadExponentialGolomb(&golomb_tmp));
- }
- } while (modification_of_pic_nums_idc != 3);
- }
- }
- }
- // TODO(pbos): Do we need support for pred_weight_table()?
- RTC_CHECK(
- !((pps_->weighted_pred_flag && (slice_type == H264::SliceType::kP ||
- slice_type == H264::SliceType::kSp)) ||
- (pps_->weighted_bipred_idc != 0 && slice_type == H264::SliceType::kB)))
- << "Missing support for pred_weight_table().";
- // if ((weighted_pred_flag && (slice_type == P || slice_type == SP)) ||
- // (weighted_bipred_idc == 1 && slice_type == B)) {
- // pred_weight_table()
- // }
- if (nal_ref_idc != 0) {
- // dec_ref_pic_marking():
- if (is_idr) {
- // no_output_of_prior_pics_flag: u(1)
- // long_term_reference_flag: u(1)
- RETURN_FALSE_ON_FAIL(slice_reader.ReadBits(&bits_tmp, 2));
- } else {
- // adaptive_ref_pic_marking_mode_flag: u(1)
- uint32_t adaptive_ref_pic_marking_mode_flag;
- RETURN_FALSE_ON_FAIL(
- slice_reader.ReadBits(&adaptive_ref_pic_marking_mode_flag, 1));
- if (adaptive_ref_pic_marking_mode_flag) {
- uint32_t memory_management_control_operation;
- do {
- // memory_management_control_operation: ue(v)
- RETURN_FALSE_ON_FAIL(slice_reader.ReadExponentialGolomb(
- &memory_management_control_operation));
- if (memory_management_control_operation == 1 ||
- memory_management_control_operation == 3) {
- // difference_of_pic_nums_minus1: ue(v)
- RETURN_FALSE_ON_FAIL(
- slice_reader.ReadExponentialGolomb(&golomb_tmp));
- }
- if (memory_management_control_operation == 2) {
- // long_term_pic_num: ue(v)
- RETURN_FALSE_ON_FAIL(
- slice_reader.ReadExponentialGolomb(&golomb_tmp));
- }
- if (memory_management_control_operation == 3 ||
- memory_management_control_operation == 6) {
- // long_term_frame_idx: ue(v)
- RETURN_FALSE_ON_FAIL(
- slice_reader.ReadExponentialGolomb(&golomb_tmp));
- }
- if (memory_management_control_operation == 4) {
- // max_long_term_frame_idx_plus1: ue(v)
- RETURN_FALSE_ON_FAIL(
- slice_reader.ReadExponentialGolomb(&golomb_tmp));
- }
- } while (memory_management_control_operation != 0);
- }
- }
- }
- // cabac not supported: entropy_coding_mode_flag == 0 asserted above.
- // if (entropy_coding_mode_flag && slice_type != I && slice_type != SI)
- // cabac_init_idc
- int32_t last_slice_qp_delta;
- RETURN_FALSE_ON_FAIL(
- slice_reader.ReadSignedExponentialGolomb(&last_slice_qp_delta));
- last_slice_qp_delta_ = rtc::Optional<int32_t>(last_slice_qp_delta);
- return true;
-}
-
-void H264BitstreamParser::ParseSlice(const uint8_t* slice, size_t length) {
- H264::NaluType nalu_type = H264::ParseNaluType(slice[0]);
- switch (nalu_type) {
- case H264::NaluType::kSps: {
- sps_ = SpsParser::ParseSps(slice + H264::kNaluTypeSize,
- length - H264::kNaluTypeSize);
- if (!sps_)
- FATAL() << "Unable to parse SPS from H264 bitstream.";
- break;
- }
- case H264::NaluType::kPps: {
- pps_ = PpsParser::ParsePps(slice + H264::kNaluTypeSize,
- length - H264::kNaluTypeSize);
- if (!pps_)
- FATAL() << "Unable to parse PPS from H264 bitstream.";
- break;
- }
- default:
- RTC_CHECK(ParseNonParameterSetNalu(slice, length, nalu_type))
- << "Failed to parse picture slice.";
- break;
- }
-}
-
-void H264BitstreamParser::ParseBitstream(const uint8_t* bitstream,
- size_t length) {
- std::vector<H264::NaluIndex> nalu_indices =
- H264::FindNaluIndices(bitstream, length);
- RTC_CHECK(!nalu_indices.empty());
- for (const H264::NaluIndex& index : nalu_indices)
- ParseSlice(&bitstream[index.payload_start_offset], index.payload_size);
-}
-
-bool H264BitstreamParser::GetLastSliceQp(int* qp) const {
- if (!last_slice_qp_delta_ || !pps_)
- return false;
- *qp = 26 + pps_->pic_init_qp_minus26 + *last_slice_qp_delta_;
- return true;
-}
-
-} // namespace webrtc
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