Extract IVF parser from VP8 parser unittest

media/filters/ivf_parser.cc

+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "base/logging.h"
+#include "base/sys_byteorder.h"
+#include "media/filters/ivf_parser.h"
+
+namespace media {
+
+void IvfFileHeader::ByteSwap() {
+  version = base::ByteSwapToLE16(version);
+  header_size = base::ByteSwapToLE16(header_size);
+  fourcc = base::ByteSwapToLE32(fourcc);
+  width = base::ByteSwapToLE16(width);
+  height = base::ByteSwapToLE16(height);
+  timebase_denum = base::ByteSwapToLE32(timebase_denum);
+  timebase_num = base::ByteSwapToLE32(timebase_num);
+  num_frames = base::ByteSwapToLE32(num_frames);
+  unused = base::ByteSwapToLE32(unused);
+}
+
+void IvfFrameHeader::ByteSwap() {
+  frame_size = base::ByteSwapToLE32(frame_size);
+  timestamp = base::ByteSwapToLE64(timestamp);
+}
+
+IvfParser::IvfParser() : ptr_(nullptr), end_(nullptr) {}
+
+bool IvfParser::Initialize(const uint8_t* stream,
+                           size_t size,
+                           IvfFileHeader* file_header) {
+  DCHECK(stream);
+  DCHECK(file_header);
+  ptr_ = stream;
+  end_ = stream + size;
+
+  if (size < sizeof(IvfFileHeader)) {
+    DLOG(ERROR) << "EOF before file header";
+    return false;
+  }
+
+  memcpy(file_header, ptr_, sizeof(IvfFileHeader));
+  file_header->ByteSwap();
+
+  if (memcmp(file_header->signature, kIvfHeaderSignature,
+             sizeof(file_header->signature)) != 0) {
+    DLOG(ERROR) << "IVF signature mismatch";
+    return false;
+  }
+  DLOG_IF(WARNING, file_header->version != 0)
+      << "IVF version unknown: " << file_header->version
+      << ", the parser may not be able to parse correctly";
+  if (file_header->header_size != sizeof(IvfFileHeader)) {
+    DLOG(ERROR) << "IVF file header size mismatch";
+    return false;
+  }
+
+  ptr_ += sizeof(IvfFileHeader);
+
+  return true;
+}
+
+bool IvfParser::ParseNextFrame(IvfFrameHeader* frame_header,
+                               const uint8_t** payload) {
+  DCHECK(ptr_);
+  DCHECK(payload);
+
+  if (end_ < ptr_ + sizeof(IvfFrameHeader)) {
+    DLOG_IF(ERROR, ptr_ != end_) << "Incomplete frame header";
+    return false;
+  }
+
+  memcpy(frame_header, ptr_, sizeof(IvfFrameHeader));
+  frame_header->ByteSwap();
+  ptr_ += sizeof(IvfFrameHeader);
+
+  if (end_ < ptr_ + frame_header->frame_size) {
+    DLOG(ERROR) << "Not enough frame data";
+    return false;
+  }
+
+  *payload = ptr_;
+  ptr_ += frame_header->frame_size;
+
+  return true;
+}
+
+}  // namespace media