[WebM] Use system temp directory if temp_dir is not specified

The original code creates temporary file in the current directory,
which may not always be writable.

Change-Id: Icc278dd5db6be6206ae29defbb7423bae39cc978

packager/media/file/file.gyp

@@ -15,6 +15,8 @@
       'sources': [
         'file.cc',
         'file.h',
+        'file_util.cc',
+        'file_util.h',
         'file_closer.h',
         'io_cache.cc',
         'io_cache.h',
@@ -48,6 +50,7 @@
       'type': '<(gtest_target_type)',
       'sources': [
         'file_unittest.cc',
+        'file_util_unittest.cc',
         'io_cache_unittest.cc',
         'memory_file_unittest.cc',
       ],

packager/media/file/file_util.cc

@@ -0,0 +1,44 @@
+// Copyright 2016 Google Inc. All rights reserved.
+//
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file or at
+// https://developers.google.com/open-source/licenses/bsd
+
+#include "packager/media/file/file_util.h"
+
+#include <inttypes.h>
+
+#include "packager/base/files/file_path.h"
+#include "packager/base/files/file_util.h"
+#include "packager/base/strings/stringprintf.h"
+#include "packager/base/threading/platform_thread.h"
+#include "packager/base/time/time.h"
+
+namespace shaka {
+namespace {
+// Create a temp file name using process/thread id and current time.
+std::string TempFileName() {
+  const int32_t tid = static_cast<int32_t>(base::PlatformThread::CurrentId());
+  const int64_t current_time = base::Time::Now().ToInternalValue();
+  return base::StringPrintf("packager-tempfile-%x-%" PRIx64, tid, current_time);
+}
+}  // namespace
+
+bool TempFilePath(const std::string& temp_dir, std::string* temp_file_path) {
+  if (temp_dir.empty()) {
+    base::FilePath file_path;
+    if (!base::CreateTemporaryFile(&file_path)) {
+      LOG(ERROR) << "Failed to create temporary file.";
+      return false;
+    }
+    *temp_file_path = file_path.AsUTF8Unsafe();
+  } else {
+    *temp_file_path =
+        base::FilePath::FromUTF8Unsafe(temp_dir)
+            .Append(base::FilePath::FromUTF8Unsafe(TempFileName()))
+            .AsUTF8Unsafe();
+  }
+  return true;
+}
+
+}  // namespace shaka

packager/media/file/file_util.h

@@ -0,0 +1,18 @@
+// Copyright 2016 Google Inc. All rights reserved.
+//
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file or at
+// https://developers.google.com/open-source/licenses/bsd
+
+#include <string>
+
+namespace shaka {
+
+/// Create a temp file name in directory @a temp_dir. Generate the temp file
+/// in os specific temporary directory if @a temp_dir is empty.
+/// @param temp_dir specifies the directory where the file should go.
+/// @param temp_file_path is the result temp file path on success.
+/// @returns true on success, false otherwise.
+bool TempFilePath(const std::string& temp_dir, std::string* temp_file_path);
+
+}  // namespace shaka

packager/media/file/file_util_unittest.cc

@@ -0,0 +1,22 @@
+// Copyright 2016 Google Inc. All rights reserved.
+//
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file or at
+// https://developers.google.com/open-source/licenses/bsd
+
+#include "packager/media/file/file_util.h"
+
+#include <gtest/gtest.h>
+
+namespace shaka {
+
+TEST(FileUtilTest, Basic) {
+  std::string temp_file_path;
+  EXPECT_TRUE(TempFilePath("test", &temp_file_path));
+  EXPECT_EQ(temp_file_path.find("test"), 0u);
+
+  EXPECT_TRUE(TempFilePath("", &temp_file_path));
+  // temp_file_path should be created in a system specific temp directory.
+}
+
+}  // namespace shaka

packager/media/formats/mp4/single_segment_segmenter.cc

@@ -6,38 +6,18 @@
 
 #include "packager/media/formats/mp4/single_segment_segmenter.h"
 
-#include <inttypes.h>
-#include <openssl/err.h>
-#include <openssl/rand.h>
-
-#include "packager/base/files/file_util.h"
-#include "packager/base/strings/stringprintf.h"
-#include "packager/base/threading/platform_thread.h"
-#include "packager/base/time/time.h"
 #include "packager/media/base/buffer_writer.h"
 #include "packager/media/base/media_stream.h"
 #include "packager/media/base/muxer_options.h"
 #include "packager/media/event/muxer_listener.h"
 #include "packager/media/event/progress_listener.h"
 #include "packager/media/file/file.h"
+#include "packager/media/file/file_util.h"
 #include "packager/media/formats/mp4/box_definitions.h"
 
 namespace shaka {
 namespace media {
 namespace mp4 {
-namespace {
-// Create a temp file name using process/thread id and current time.
-std::string TempFileName() {
-  int32_t tid = static_cast<int32_t>(base::PlatformThread::CurrentId());
-  int64_t rand = 0;
-  if (RAND_bytes(reinterpret_cast<uint8_t*>(&rand), sizeof(rand)) != 1) {
-    LOG(WARNING) << "RAND_bytes failed with error: "
-                 << ERR_error_string(ERR_get_error(), NULL);
-    rand = base::Time::Now().ToInternalValue();
-  }
-  return base::StringPrintf("packager-tempfile-%x-%" PRIx64, tid, rand);
-}
-}  // namespace
 
 SingleSegmentSegmenter::SingleSegmentSegmenter(const MuxerOptions& options,
                                                std::unique_ptr<FileType> ftyp,
@@ -77,18 +57,8 @@ Status SingleSegmentSegmenter::DoInitialize() {
   // progress_target was set for stage 1. Times two to account for stage 2.
   set_progress_target(progress_target() * 2);
 
-  if (options().temp_dir.empty()) {
-    base::FilePath temp_file_path;
-    if (!base::CreateTemporaryFile(&temp_file_path)) {
-      LOG(ERROR) << "Failed to create temporary file.";
-      return Status(error::FILE_FAILURE, "Unable to create temporary file.");
-    }
-    temp_file_name_ = temp_file_path.AsUTF8Unsafe();
-  } else {
-    temp_file_name_ =
-      base::FilePath::FromUTF8Unsafe(options().temp_dir)
-        .Append(base::FilePath::FromUTF8Unsafe(TempFileName())).AsUTF8Unsafe();
-  }
+  if (!TempFilePath(options().temp_dir, &temp_file_name_))
+    return Status(error::FILE_FAILURE, "Unable to create temporary file.");
   temp_file_.reset(File::Open(temp_file_name_.c_str(), "w"));
   return temp_file_
              ? Status::OK

packager/media/formats/webm/seek_head.cc

@@ -52,8 +52,7 @@ bool SeekHead::Write(mkvmuxer::IMkvWriter* writer) {
   uint64_t payload_size = 0;
   for (const SeekHead::SeekElement& seek_element : seek_elements) {
     payload_size +=
-        seek_element.size +
-        EbmlMasterElementSize(mkvmuxer::kMkvSeek, seek_element.size);
+        EbmlMasterElementWithPayloadSize(mkvmuxer::kMkvSeek, seek_element.size);
   }
 
   const int64_t start_pos = writer->Position();

packager/media/formats/webm/two_pass_single_segment_segmenter.cc

@@ -6,20 +6,13 @@
 
 #include "packager/media/formats/webm/two_pass_single_segment_segmenter.h"
 
-#include <inttypes.h>
-#include <openssl/err.h>
-#include <openssl/rand.h>
-
 #include <algorithm>
 
-#include "packager/base/files/file_path.h"
-#include "packager/base/strings/stringprintf.h"
-#include "packager/base/threading/platform_thread.h"
-#include "packager/base/time/time.h"
 #include "packager/media/base/media_sample.h"
 #include "packager/media/base/media_stream.h"
 #include "packager/media/base/muxer_options.h"
 #include "packager/media/base/stream_info.h"
+#include "packager/media/file/file_util.h"
 #include "packager/third_party/libwebm/src/mkvmuxer.hpp"
 #include "packager/third_party/libwebm/src/mkvmuxerutil.hpp"
 #include "packager/third_party/libwebm/src/webmids.hpp"
@@ -48,22 +41,6 @@ uint64_t UpdateCues(mkvmuxer::Cues* cues) {
   return cues_size;
 }
 
-/// Create the temp file name using process/thread id and current time.
-std::string TempFileName(const MuxerOptions& options) {
-  // TODO: Move to a common util function and remove other uses.
-  int32_t tid = static_cast<int32_t>(base::PlatformThread::CurrentId());
-  int64_t rand = 0;
-  if (RAND_bytes(reinterpret_cast<uint8_t*>(&rand), sizeof(rand)) != 1) {
-    LOG(WARNING) << "RAND_bytes failed with error: "
-                 << ERR_error_string(ERR_get_error(), NULL);
-    rand = base::Time::Now().ToInternalValue();
-  }
-  std::string file_prefix =
-      base::StringPrintf("packager-tempfile-%x-%" PRIx64 ".tmp", tid, rand);
-  return base::FilePath::FromUTF8Unsafe(options.temp_dir).Append(
-      base::FilePath::FromUTF8Unsafe(file_prefix)).AsUTF8Unsafe();
-}
-
 // Skips a given number of bytes in a file by reading.  This allows
 // forward-seeking in non-seekable files.
 bool ReadSkip(File* file, int64_t byte_count) {
@@ -100,7 +77,8 @@ Status TwoPassSingleSegmentSegmenter::DoInitialize(
 
   real_writer_ = std::move(writer);
 
-  temp_file_name_ = TempFileName(options());
+  if (!TempFilePath(options().temp_dir, &temp_file_name_))
+    return Status(error::FILE_FAILURE, "Unable to create temporary file.");
   std::unique_ptr<MkvWriter> temp(new MkvWriter);
   Status status = temp->Open(temp_file_name_);
   if (!status.ok())