CmaRenderer is dead. Long live MojoRenderer.

chromecast/media/cma/ipc/media_message.cc

-// 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 "chromecast/media/cma/ipc/media_message.h"
-
-#include <limits>
-#include <utility>
-
-#include "base/logging.h"
-#include "chromecast/media/cma/ipc/media_memory_chunk.h"
-
-namespace chromecast {
-namespace media {
-
-// static
-std::unique_ptr<MediaMessage> MediaMessage::CreateDummyMessage(uint32_t type) {
-  return std::unique_ptr<MediaMessage>(
-      new MediaMessage(type, std::numeric_limits<size_t>::max()));
-}
-
-// static
-std::unique_ptr<MediaMessage> MediaMessage::CreateMessage(
-    uint32_t type,
-    const MemoryAllocatorCB& memory_allocator,
-    size_t msg_content_capacity) {
-  size_t msg_size = minimum_msg_size() + msg_content_capacity;
-
-  // Make the message size a multiple of the alignment
-  // so that if we have proper alignment for array of messages.
-  size_t end_alignment = msg_size % ALIGNOF(SerializedMsg);
-  if (end_alignment != 0)
-    msg_size += ALIGNOF(SerializedMsg) - end_alignment;
-
-  std::unique_ptr<MediaMemoryChunk> memory(memory_allocator.Run(msg_size));
-  if (!memory)
-    return std::unique_ptr<MediaMessage>();
-
-  return std::unique_ptr<MediaMessage>(
-      new MediaMessage(type, std::move(memory)));
-}
-
-// static
-std::unique_ptr<MediaMessage> MediaMessage::CreateMessage(
-    uint32_t type,
-    std::unique_ptr<MediaMemoryChunk> memory) {
-  return std::unique_ptr<MediaMessage>(
-      new MediaMessage(type, std::move(memory)));
-}
-
-// static
-std::unique_ptr<MediaMessage> MediaMessage::MapMessage(
-    std::unique_ptr<MediaMemoryChunk> memory) {
-  return std::unique_ptr<MediaMessage>(new MediaMessage(std::move(memory)));
-}
-
-MediaMessage::MediaMessage(uint32_t type, size_t msg_size)
-    : is_dummy_msg_(true),
-      cached_header_(&cached_msg_.header),
-      msg_(&cached_msg_),
-      msg_read_only_(&cached_msg_),
-      rd_offset_(0) {
-  cached_header_->size = msg_size;
-  cached_header_->type = type;
-  cached_header_->content_size = 0;
-}
-
-MediaMessage::MediaMessage(uint32_t type,
-                           std::unique_ptr<MediaMemoryChunk> memory)
-    : is_dummy_msg_(false),
-      cached_header_(&cached_msg_.header),
-      msg_(static_cast<SerializedMsg*>(memory->data())),
-      msg_read_only_(msg_),
-      mem_(std::move(memory)),
-      rd_offset_(0) {
-  CHECK(mem_->valid());
-  CHECK_GE(mem_->size(), minimum_msg_size());
-
-  // Check memory alignment:
-  // needed to cast properly |msg_dst| to a SerializedMsg.
-  CHECK_EQ(
-      reinterpret_cast<uintptr_t>(mem_->data()) % ALIGNOF(SerializedMsg), 0u);
-
-  // Make sure that |mem_->data()| + |mem_->size()| is also aligned correctly.
-  // This is needed if we append a second serialized message next to this one.
-  // The second serialized message must be aligned correctly.
-  // It is similar to what a compiler is doing for arrays of structures.
-  CHECK_EQ(mem_->size() % ALIGNOF(SerializedMsg), 0u);
-
-  cached_header_->size = mem_->size();
-  cached_header_->type = type;
-  cached_header_->content_size = 0;
-  msg_->header = *cached_header_;
-}
-
-MediaMessage::MediaMessage(std::unique_ptr<MediaMemoryChunk> memory)
-    : is_dummy_msg_(false),
-      cached_header_(&cached_msg_.header),
-      msg_(NULL),
-      msg_read_only_(static_cast<SerializedMsg*>(memory->data())),
-      mem_(std::move(memory)),
-      rd_offset_(0) {
-  CHECK(mem_->valid());
-
-  // Check memory alignment.
-  CHECK_EQ(
-      reinterpret_cast<uintptr_t>(mem_->data()) % ALIGNOF(SerializedMsg), 0u);
-
-  // Cache the message header which cannot be modified while reading.
-  CHECK_GE(mem_->size(), minimum_msg_size());
-  *cached_header_ = msg_read_only_->header;
-  CHECK_GE(cached_header_->size, minimum_msg_size());
-
-  // Make sure if we have 2 consecutive serialized messages in memory,
-  // the 2nd message is also aligned correctly.
-  CHECK_EQ(cached_header_->size % ALIGNOF(SerializedMsg), 0u);
-
-  size_t max_content_size = cached_header_->size - minimum_msg_size();
-  CHECK_LE(cached_header_->content_size, max_content_size);
-}
-
-MediaMessage::~MediaMessage() {
-}
-
-bool MediaMessage::IsSerializedMsgAvailable() const {
-  return !is_dummy_msg_ && mem_->valid();
-}
-
-bool MediaMessage::WriteBuffer(const void* src, size_t size) {
-  // No message to write into.
-  if (!msg_)
-    return false;
-
-  // The underlying memory was invalidated.
-  if (!is_dummy_msg_ && !mem_->valid())
-    return false;
-
-  size_t max_content_size = cached_header_->size - minimum_msg_size();
-  if (cached_header_->content_size + size > max_content_size) {
-    cached_header_->content_size = max_content_size;
-    msg_->header.content_size = cached_header_->content_size;
-    return false;
-  }
-
-  // Write the message only for non-dummy messages.
-  if (!is_dummy_msg_) {
-    uint8_t* wr_ptr = &msg_->content + cached_header_->content_size;
-    memcpy(wr_ptr, src, size);
-  }
-
-  cached_header_->content_size += size;
-  msg_->header.content_size = cached_header_->content_size;
-  return true;
-}
-
-bool MediaMessage::ReadBuffer(void* dst, size_t size) {
-  // No read possible for a dummy message.
-  if (is_dummy_msg_)
-    return false;
-
-  // The underlying memory was invalidated.
-  if (!mem_->valid())
-    return false;
-
-  if (rd_offset_ + size > cached_header_->content_size) {
-    rd_offset_ = cached_header_->content_size;
-    return false;
-  }
-
-  const uint8_t* rd_ptr = &msg_read_only_->content + rd_offset_;
-  memcpy(dst, rd_ptr, size);
-  rd_offset_ += size;
-  return true;
-}
-
-void* MediaMessage::GetWritableBuffer(size_t size) {
-  // No read possible for a dummy message.
-  if (is_dummy_msg_)
-    return NULL;
-
-  // The underlying memory was invalidated.
-  if (!mem_->valid())
-    return NULL;
-
-  if (rd_offset_ + size > cached_header_->content_size) {
-    rd_offset_ = cached_header_->content_size;
-    return NULL;
-  }
-
-  uint8_t* rd_ptr = &msg_read_only_->content + rd_offset_;
-  rd_offset_ += size;
-  return rd_ptr;
-}
-
-const void* MediaMessage::GetBuffer(size_t size) {
-  return GetWritableBuffer(size);
-}
-
-}  // namespace media
-}  // namespace chromecast