Introducing DecoderBuffer and general Buffer cleanup.

media/base/decoder_buffer.cc

Index: media/base/decoder_buffer.cc
diff --git a/media/base/decoder_buffer.cc b/media/base/decoder_buffer.cc
new file mode 100644
index 0000000000000000000000000000000000000000..527fb65ec945c550fc673aca5501aed16ec79fe3
--- /dev/null
+++ b/media/base/decoder_buffer.cc
@@ -0,0 +1,87 @@
+// Copyright (c) 2012 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/base/decoder_buffer.h"
+
+#include "base/logging.h"
+#include "media/base/decrypt_config.h"
+#if !defined(OS_ANDROID)
+#include "media/ffmpeg/ffmpeg_common.h"
+#endif
+
+namespace media {
+
+DecoderBuffer::DecoderBuffer(int buffer_size)
+    : Buffer(base::TimeDelta(), base::TimeDelta()),
+      buffer_size_(buffer_size) {
+  Initialize();
+}
+
+DecoderBuffer::DecoderBuffer(const uint8* data, int buffer_size)
+    : Buffer(base::TimeDelta(), base::TimeDelta()),
+      buffer_size_(buffer_size) {
+  // Prevent invalid allocations.  Also used to create end of stream buffers.
+  if (!data) {
+    buffer_size_ = 0;
+    data_ = NULL;
+    return;
+  }
+
+  Initialize();
+  memcpy(data_, data, buffer_size_);
+}
+
+DecoderBuffer::~DecoderBuffer() {
+#if !defined(OS_ANDROID)
+  av_free(data_);
+#else
+  delete[] data_;
+#endif
+}
+
+void DecoderBuffer::Initialize() {
+  DCHECK_GE(buffer_size_, 0);
+#if !defined(OS_ANDROID)
+  // Why FF_INPUT_BUFFER_PADDING_SIZE?  FFmpeg assumes all input buffers are
+  // padded.  Using av_malloc with padding ensures FFmpeg only recieves data
+  // padded and aligned to its specifications.
+  data_ = reinterpret_cast<uint8*>(
+      av_malloc(buffer_size_ + FF_INPUT_BUFFER_PADDING_SIZE));
+  memset(data_ + buffer_size_, 0, FF_INPUT_BUFFER_PADDING_SIZE);
+#else
+  data_ = new uint8[buffer_size_];
+#endif
+}
+
+scoped_refptr<DecoderBuffer> DecoderBuffer::CopyFrom(const uint8* data,
+                                                     int data_size) {
+  DCHECK(data);
+  return make_scoped_refptr(new DecoderBuffer(data, data_size));
+}
+
+scoped_refptr<DecoderBuffer> DecoderBuffer::CreateEOSBuffer() {
+  return make_scoped_refptr(new DecoderBuffer(NULL, 0));
+}
+
+const uint8* DecoderBuffer::GetData() const {
+  return data_;
+}
+
+int DecoderBuffer::GetDataSize() const {
+  return buffer_size_;
+}
+
+uint8* DecoderBuffer::GetWritableData() {
+  return data_;
+}
+
+const DecryptConfig* DecoderBuffer::GetDecryptConfig() const {
+  return decrypt_config_.get();
+}
+
+void DecoderBuffer::SetDecryptConfig(scoped_ptr<DecryptConfig> decrypt_config) {
+  decrypt_config_ = decrypt_config.Pass();
+}
+
+}  // namespace media