src/starboard/stub/configuration_constants.cc - cobalt - Git at Google

 // Copyright 2019 The Cobalt Authors. All Rights Reserved.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
 // You may obtain a copy of the License at
 //
 //     http://www.apache.org/licenses/LICENSE-2.0
 //
 // Unless required by applicable law or agreed to in writing, software
 // distributed under the License is distributed on an "AS IS" BASIS,
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.

 // This file defines all configuration constants for a platform.

 #include "starboard/configuration_constants.h"

 // Determines the threshhold of allocation size that should be done with mmap
 // (if available), rather than allocated within the core heap.
 const size_t kSbDefaultMmapThreshold = 256 * 1024U;

 // The current platform's maximum length of the name of a single directory
 // entry, not including the absolute path.
 const int32_t kSbFileMaxName = 64;

 // The current platform's maximum number of files that can be opened at the
 // same time by one process.
 const uint32_t kSbFileMaxOpen = 64;

 // The current platform's alternate file path component separator character.
 // This is like SB_FILE_SEP_CHAR, except if your platform supports an alternate
 // character, then you can place that here. For example, on windows machines,
 // the primary separator character is probably '\', but the alternate is '/'.
 const char kSbFileAltSepChar = '/';

 // The string form of SB_FILE_ALT_SEP_CHAR.
 const char* kSbFileAltSepString = "/";

 // The current platform's maximum length of an absolute path.
 const uint32_t kSbFileMaxPath = 4096;

 // The current platform's file path component separator character. This is the
 // character that appears after a directory in a file path. For example, the
 // absolute canonical path of the file "/path/to/a/file.txt" uses '/' as a path
 // component separator character.
 const char kSbFileSepChar = '/';

 // The string form of SB_FILE_SEP_CHAR.
 const char* kSbFileSepString = "/";

 // Allow ac3 and ec3 support
 const bool kSbHasAc3Audio = true;

 // Specifies whether this platform updates audio frames asynchronously.
 const bool kSbHasAsyncAudioFramesReporting = false;

 // Allow playing audioless video.
 const bool kSbHasAudiolessVideo = true;

 // Specifies whether this platform has webm/vp9 support.  This should be set to
 // non-zero on platforms with webm/vp9 support.
 const bool kSbHasMediaWebmVp9Support = false;

 // Whether the current platform supports thread priorities.
 const bool kSbHasThreadPrioritySupport = false;

 // Determines the alignment that allocations should have on this platform.
 const size_t kSbMallocAlignment = 16;

 // The maximum number of thread local storage keys supported by this platform.
 const uint32_t kSbMaxThreadLocalKeys = 512;

 // The maximum length of a name for a thread, including the NULL-terminator.
 const int32_t kSbMaxThreadNameLength = 16;

 // Defines the path where memory debugging logs should be written to.
 const char* kSbMemoryLogPath = "/tmp/starboard";

 // The maximum audio bitrate the platform can decode.  The following value
 // equals to 5M bytes per seconds which is more than enough for compressed
 // audio.
 const uint32_t kSbMediaMaxAudioBitrateInBitsPerSecond = 40 * 1024 * 1024;

 // The maximum video bitrate the platform can decode.  The following value
 // equals to 25M bytes per seconds which is more than enough for compressed
 // video.
 const uint32_t kSbMediaMaxVideoBitrateInBitsPerSecond = 200 * 1024 * 1024;

 // Specify the number of video frames to be cached during playback.  A large
 // value leads to more stable fps but also causes the app to use more memory.
 const uint32_t kSbMediaMaximumVideoFrames = 12;

 // The encoded video frames are compressed in different ways, so their decoding
 // time can vary a lot.  Occasionally a single frame can take longer time to
 // decode than the average time per frame.  The player has to cache some frames
 // to account for such inconsistency.  The number of frames being cached are
 // controlled by SB_MEDIA_MAXIMUM_VIDEO_PREROLL_FRAMES and
 // SB_MEDIA_MAXIMUM_VIDEO_FRAMES.
 //
 // Specify the number of video frames to be cached before the playback starts.
 // Note that setting this value too large may increase the playback start delay.
 const uint32_t kSbMediaMaximumVideoPrerollFrames = 4;

 // Specifies how video frame buffers must be aligned on this platform.
 const uint32_t kSbMediaVideoFrameAlignment = 256;

 // The memory page size, which controls the size of chunks on memory that
 // allocators deal with, and the alignment of those chunks. This doesn't have to
 // be the hardware-defined physical page size, but it should be a multiple of
 // it.
 const size_t kSbMemoryPageSize = 4096;

 // Specifies the network receive buffer size in bytes, set via
 // SbSocketSetReceiveBufferSize().
 //
 // Setting this to 0 indicates that SbSocketSetReceiveBufferSize() should
 // not be called. Use this for OSs (such as Linux) where receive buffer
 // auto-tuning is better.
 //
 // On some platforms, this may affect max TCP window size which may
 // dramatically affect throughput in the presence of latency.
 //
 // If your platform does not have a good TCP auto-tuning mechanism,
 // a setting of (128 * 1024) here is recommended.
 const uint32_t kSbNetworkReceiveBufferSize = 0;

 // Defines the maximum number of simultaneous threads for this platform. Some
 // platforms require sharing thread handles with other kinds of system handles,
 // like mutexes, so we want to keep this managable.
 const uint32_t kSbMaxThreads = 90;

 // The current platform's search path component separator character. When
 // specifying an ordered list of absolute paths of directories to search for a
 // given reason, this is the character that appears between entries. For
 // example, the search path of "/etc/search/first:/etc/search/second" uses ':'
 // as a search path component separator character.
 const char kSbPathSepChar = ':';

 // The string form of SB_PATH_SEP_CHAR.
 const char* kSbPathSepString = ":";

 // The maximum number of users that can be signed in at the same time.
 const uint32_t kSbUserMaxSignedIn = 1;
	// Copyright 2019 The Cobalt Authors. All Rights Reserved.
	//
	// Licensed under the Apache License, Version 2.0 (the "License");
	// you may not use this file except in compliance with the License.
	// You may obtain a copy of the License at
	//
	// http://www.apache.org/licenses/LICENSE-2.0
	//
	// Unless required by applicable law or agreed to in writing, software
	// distributed under the License is distributed on an "AS IS" BASIS,
	// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	// See the License for the specific language governing permissions and
	// limitations under the License.

	// This file defines all configuration constants for a platform.

	#include "starboard/configuration_constants.h"

	// Determines the threshhold of allocation size that should be done with mmap
	// (if available), rather than allocated within the core heap.
	const size_t kSbDefaultMmapThreshold = 256 * 1024U;

	// The current platform's maximum length of the name of a single directory
	// entry, not including the absolute path.
	const int32_t kSbFileMaxName = 64;

	// The current platform's maximum number of files that can be opened at the
	// same time by one process.
	const uint32_t kSbFileMaxOpen = 64;

	// The current platform's alternate file path component separator character.
	// This is like SB_FILE_SEP_CHAR, except if your platform supports an alternate
	// character, then you can place that here. For example, on windows machines,
	// the primary separator character is probably '\', but the alternate is '/'.
	const char kSbFileAltSepChar = '/';

	// The string form of SB_FILE_ALT_SEP_CHAR.
	const char* kSbFileAltSepString = "/";

	// The current platform's maximum length of an absolute path.
	const uint32_t kSbFileMaxPath = 4096;

	// The current platform's file path component separator character. This is the
	// character that appears after a directory in a file path. For example, the
	// absolute canonical path of the file "/path/to/a/file.txt" uses '/' as a path
	// component separator character.
	const char kSbFileSepChar = '/';

	// The string form of SB_FILE_SEP_CHAR.
	const char* kSbFileSepString = "/";

	// Allow ac3 and ec3 support
	const bool kSbHasAc3Audio = true;

	// Specifies whether this platform updates audio frames asynchronously.
	const bool kSbHasAsyncAudioFramesReporting = false;

	// Allow playing audioless video.
	const bool kSbHasAudiolessVideo = true;

	// Specifies whether this platform has webm/vp9 support. This should be set to
	// non-zero on platforms with webm/vp9 support.
	const bool kSbHasMediaWebmVp9Support = false;

	// Whether the current platform supports thread priorities.
	const bool kSbHasThreadPrioritySupport = false;

	// Determines the alignment that allocations should have on this platform.
	const size_t kSbMallocAlignment = 16;

	// The maximum number of thread local storage keys supported by this platform.
	const uint32_t kSbMaxThreadLocalKeys = 512;

	// The maximum length of a name for a thread, including the NULL-terminator.
	const int32_t kSbMaxThreadNameLength = 16;

	// Defines the path where memory debugging logs should be written to.
	const char* kSbMemoryLogPath = "/tmp/starboard";

	// The maximum audio bitrate the platform can decode. The following value
	// equals to 5M bytes per seconds which is more than enough for compressed
	// audio.
	const uint32_t kSbMediaMaxAudioBitrateInBitsPerSecond = 40 * 1024 * 1024;

	// The maximum video bitrate the platform can decode. The following value
	// equals to 25M bytes per seconds which is more than enough for compressed
	// video.
	const uint32_t kSbMediaMaxVideoBitrateInBitsPerSecond = 200 * 1024 * 1024;

	// Specify the number of video frames to be cached during playback. A large
	// value leads to more stable fps but also causes the app to use more memory.
	const uint32_t kSbMediaMaximumVideoFrames = 12;

	// The encoded video frames are compressed in different ways, so their decoding
	// time can vary a lot. Occasionally a single frame can take longer time to
	// decode than the average time per frame. The player has to cache some frames
	// to account for such inconsistency. The number of frames being cached are
	// controlled by SB_MEDIA_MAXIMUM_VIDEO_PREROLL_FRAMES and
	// SB_MEDIA_MAXIMUM_VIDEO_FRAMES.
	//
	// Specify the number of video frames to be cached before the playback starts.
	// Note that setting this value too large may increase the playback start delay.
	const uint32_t kSbMediaMaximumVideoPrerollFrames = 4;

	// Specifies how video frame buffers must be aligned on this platform.
	const uint32_t kSbMediaVideoFrameAlignment = 256;

	// The memory page size, which controls the size of chunks on memory that
	// allocators deal with, and the alignment of those chunks. This doesn't have to
	// be the hardware-defined physical page size, but it should be a multiple of
	// it.
	const size_t kSbMemoryPageSize = 4096;

	// Specifies the network receive buffer size in bytes, set via
	// SbSocketSetReceiveBufferSize().
	//
	// Setting this to 0 indicates that SbSocketSetReceiveBufferSize() should
	// not be called. Use this for OSs (such as Linux) where receive buffer
	// auto-tuning is better.
	//
	// On some platforms, this may affect max TCP window size which may
	// dramatically affect throughput in the presence of latency.
	//
	// If your platform does not have a good TCP auto-tuning mechanism,
	// a setting of (128 * 1024) here is recommended.
	const uint32_t kSbNetworkReceiveBufferSize = 0;

	// Defines the maximum number of simultaneous threads for this platform. Some
	// platforms require sharing thread handles with other kinds of system handles,
	// like mutexes, so we want to keep this managable.
	const uint32_t kSbMaxThreads = 90;

	// The current platform's search path component separator character. When
	// specifying an ordered list of absolute paths of directories to search for a
	// given reason, this is the character that appears between entries. For
	// example, the search path of "/etc/search/first:/etc/search/second" uses ':'
	// as a search path component separator character.
	const char kSbPathSepChar = ':';

	// The string form of SB_PATH_SEP_CHAR.
	const char* kSbPathSepString = ":";

	// The maximum number of users that can be signed in at the same time.
	const uint32_t kSbUserMaxSignedIn = 1;