97 lines
3.0 KiB
C++
97 lines
3.0 KiB
C++
// Copyright 2019 The libgav1 Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include "examples/ivf_parser.h"
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#include <cstdio>
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#include <cstring>
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#include "examples/file_reader_constants.h"
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#include "examples/logging.h"
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namespace libgav1 {
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namespace {
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size_t ReadLittleEndian16(const uint8_t* const buffer) {
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size_t value = buffer[1] << 8;
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value |= buffer[0];
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return value;
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}
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size_t ReadLittleEndian32(const uint8_t* const buffer) {
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size_t value = buffer[3] << 24;
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value |= buffer[2] << 16;
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value |= buffer[1] << 8;
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value |= buffer[0];
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return value;
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}
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} // namespace
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bool ParseIvfFileHeader(const uint8_t* const header_buffer,
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IvfFileHeader* const ivf_file_header) {
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if (header_buffer == nullptr || ivf_file_header == nullptr) return false;
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if (memcmp(kIvfSignature, header_buffer, 4) != 0) {
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return false;
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}
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// Verify header version and length.
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const size_t ivf_header_version = ReadLittleEndian16(&header_buffer[4]);
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if (ivf_header_version != kIvfHeaderVersion) {
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LIBGAV1_EXAMPLES_LOG_ERROR("Unexpected IVF version");
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}
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const size_t ivf_header_size = ReadLittleEndian16(&header_buffer[6]);
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if (ivf_header_size != kIvfFileHeaderSize) {
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LIBGAV1_EXAMPLES_LOG_ERROR("Invalid IVF file header size");
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return false;
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}
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if (memcmp(kAv1FourCcLower, &header_buffer[8], 4) != 0 &&
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memcmp(kAv1FourCcUpper, &header_buffer[8], 4) != 0) {
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LIBGAV1_EXAMPLES_LOG_ERROR("Unsupported codec 4CC");
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return false;
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}
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ivf_file_header->width = ReadLittleEndian16(&header_buffer[12]);
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ivf_file_header->height = ReadLittleEndian16(&header_buffer[14]);
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ivf_file_header->frame_rate_numerator =
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ReadLittleEndian32(&header_buffer[16]);
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ivf_file_header->frame_rate_denominator =
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ReadLittleEndian32(&header_buffer[20]);
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return true;
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}
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bool ParseIvfFrameHeader(const uint8_t* const header_buffer,
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IvfFrameHeader* const ivf_frame_header) {
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if (header_buffer == nullptr || ivf_frame_header == nullptr) return false;
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ivf_frame_header->frame_size = ReadLittleEndian32(header_buffer);
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if (ivf_frame_header->frame_size > kMaxTemporalUnitSize) {
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LIBGAV1_EXAMPLES_LOG_ERROR("Temporal Unit size exceeds maximum");
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return false;
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}
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ivf_frame_header->timestamp = ReadLittleEndian32(&header_buffer[4]);
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const uint64_t timestamp_hi =
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static_cast<uint64_t>(ReadLittleEndian32(&header_buffer[8])) << 32;
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ivf_frame_header->timestamp |= timestamp_hi;
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return true;
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}
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} // namespace libgav1
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