OBS/obs-studio
OBS/obs-studio
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obs-studio/libobs/CMakeLists.txt
jp9000 c1dd156db8 libobs: Implement new audio subsystem 
The new audio subsystem fixes two issues:

- First Primary issue it fixes is the ability for parent sources to
  intercept the audio of child sources, and do custom processing on
  them.  The main reason for this was the ability to do custom
  cross-fading in transitions, but it's also useful for things such as
  side-chain effects, applying audio effects to entire scenes, applying
  scene-specific audio filters on sub-sources, and other such
  possibilities.

- The secondary issue that needed fixing was audio buffering.
  Previously, audio buffering was always a fixed buffer size, so it
  would always have exactly a certain number of milliseconds of audio
  buffering (and thus output delay).  Instead, it now dynamically
  increases audio buffering only as necessary, minimizing output delay,
  and removing the need for users to have to worry about an audio
  buffering setting.

The new design makes it so that audio from the leaves of the scene graph
flow to the root nodes, and can be intercepted by parent sources.  Each
audio source handles its own buffering, and each audio tick a specific
number of audio frames are popped from the front of the circular buffer
on each audio source.  Composite sources (such as scenes) can access the
audio for child sources and do custom processing or mixing on that
audio.  Composite sources use the audio_render callback of sources to do
synchronous or deferred audio processing per audio tick.  Things like
scenes now mix audio from their sub-sources.
2016-01-26 11:49:34 -08:00

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CMake
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project(libobs)
find_package(Threads REQUIRED)
find_package(FFmpeg REQUIRED
COMPONENTS avformat avutil swscale swresample
OPTIONAL_COMPONENTS avcodec)
include_directories(${FFMPEG_INCLUDE_DIRS})
if (NOT "${FFMPEG_AVCODEC_LIBRARIES}" STREQUAL "")
list(REMOVE_ITEM FFMPEG_LIBRARIES ${FFMPEG_AVCODEC_LIBRARIES})
endif()
if(UNIX)
find_package(DBus QUIET)
else()
set(HAVE_DBUS "0")
endif()
find_package(ImageMagick QUIET COMPONENTS MagickCore)
if(NOT ImageMagick_MagickCore_FOUND AND NOT FFMPEG_AVCODEC_FOUND)
message(FATAL_ERROR "Either MagickCore or Libavcodec is required, but both were not found")
endif()
option(LIBOBS_PREFER_IMAGEMAGICK "Prefer ImageMagick over ffmpeg for image loading" OFF)
if(NOT FFMPEG_AVCODEC_FOUND OR (ImageMagick_MagickCore_FOUND AND LIBOBS_PREFER_IMAGEMAGICK))
message(STATUS "Using ImageMagick for image loading in libobs")
set(libobs_image_loading_SOURCES
graphics/graphics-magick.c)
set(libobs_image_loading_LIBRARIES
${ImageMagick_LIBRARIES})
include_directories(${ImageMagick_INCLUDE_DIRS})
else()
message(STATUS "Using libavcodec for image loading in libobs")
set(libobs_image_loading_SOURCES
graphics/graphics-ffmpeg.c)
set(libobs_image_loading_LIBRARIES
${FFMPEG_AVCODEC_LIBRARIES})
endif()
find_package(ZLIB REQUIRED)
include_directories(SYSTEM ${ZLIB_INCLUDE_DIR})
add_definitions(-DLIBOBS_EXPORTS)
include_directories(${OBS_JANSSON_INCLUDE_DIRS})
if(WIN32)
set(libobs_PLATFORM_SOURCES
obs-win-crash-handler.c
obs-windows.c
util/threading-windows.c
util/pipe-windows.c
util/platform-windows.c)
set(libobs_PLATFORM_HEADERS
util/threading-windows.h
util/windows/win-version.h
util/windows/ComPtr.hpp
util/windows/CoTaskMemPtr.hpp
util/windows/HRError.hpp
util/windows/WinHandle.hpp)
set(libobs_PLATFORM_DEPS winmm)
if(MSVC)
set(libobs_PLATFORM_DEPS
${libobs_PLATFORM_DEPS}
w32-pthreads)
endif()
elseif(APPLE)
set(libobs_PLATFORM_SOURCES
obs-cocoa.c
util/threading-posix.c
util/pipe-posix.c
util/platform-nix.c
util/platform-cocoa.m)
set(libobs_PLATFORM_HEADERS
util/threading-posix.h)
set_source_files_properties(${libobs_PLATFORM_SOURCES}
PROPERTIES
LANGUAGE C
COMPILE_FLAGS "-fobjc-arc")
find_library(COCOA Cocoa)
mark_as_advanced(COCOA)
include_directories(${COCOA})
find_library(APPKIT AppKit)
mark_as_advanced(APPKIT)
include_directories(${APPKIT})
find_library(IOKIT IOKit)
mark_as_advanced(IOKIT)
include_directories(${IOKIT})
find_library(CARBON Carbon)
mark_as_advanced(CARBON)
include_directories(${CARBON})
set(libobs_PLATFORM_DEPS
${COCOA}
${APPKIT}
${IOKIT}
${CARBON})
elseif(UNIX)
set(libobs_PLATFORM_SOURCES
obs-nix.c
util/threading-posix.c
util/pipe-posix.c
util/platform-nix.c)
set(libobs_PLATFORM_HEADERS
util/threading-posix.h)
if(DBUS_FOUND)
set(libobs_PLATFORM_SOURCES ${libobs_PLATFORM_SOURCES}
util/platform-nix-dbus.c)
include_directories(${DBUS_INCLUDE_DIRS})
set(libobs_PLATFORM_DEPS
${libobs_PLATFORM_DEPS}
${DBUS_LIBRARIES})
endif()
if(${CMAKE_SYSTEM_NAME} MATCHES "FreeBSD")
# use the sysinfo compatibility library on bsd
find_package(Libsysinfo REQUIRED)
include_directories(${SYSINFO_INCLUDE_DIRS})
set(libobs_PLATFORM_DEPS
${libobs_PLATFORM_DEPS}
${SYSINFO_LIBRARIES})
endif()
endif()
if(MSVC)
set(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} /SAFESEH:NO")
set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} /EHc-")
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /EHc-")
endif()
configure_file(
"${CMAKE_CURRENT_SOURCE_DIR}/obsconfig.h.in"
"${CMAKE_BINARY_DIR}/config/obsconfig.h")
set(libobs_config_HEADERS
"${CMAKE_BINARY_DIR}/config/obsconfig.h"
obs-config.h)
set(libobs_callback_SOURCES
callback/calldata.c
callback/decl.c
callback/signal.c
callback/proc.c)
set(libobs_callback_HEADERS
callback/calldata.h
callback/decl.h
callback/proc.h
callback/signal.h)
set(libobs_graphics_SOURCES
${libobs_image_loading_SOURCES}
graphics/quat.c
graphics/effect-parser.c
graphics/axisang.c
graphics/vec4.c
graphics/vec2.c
graphics/libnsgif/libnsgif.c
graphics/texture-render.c
graphics/image-file.c
graphics/bounds.c
graphics/matrix3.c
graphics/matrix4.c
graphics/vec3.c
graphics/graphics.c
graphics/shader-parser.c
graphics/plane.c
graphics/effect.c
graphics/math-extra.c
graphics/graphics-imports.c)
set(libobs_graphics_HEADERS
graphics/plane.h
graphics/quat.h
graphics/input.h
graphics/axisang.h
graphics/shader-parser.h
graphics/effect.h
graphics/math-defs.h
graphics/matrix4.h
graphics/graphics.h
graphics/graphics-internal.h
graphics/libnsgif/libnsgif.h
graphics/device-exports.h
graphics/image-file.h
graphics/vec2.h
graphics/vec4.h
graphics/matrix3.h
graphics/vec3.h
graphics/math-extra.h
graphics/bounds.h
graphics/effect-parser.h)
set(libobs_mediaio_SOURCES
media-io/video-io.c
media-io/video-fourcc.c
media-io/video-matrices.c
media-io/audio-io.c
media-io/video-frame.c
media-io/format-conversion.c
media-io/audio-resampler-ffmpeg.c
media-io/video-scaler-ffmpeg.c
media-io/media-remux.c)
set(libobs_mediaio_HEADERS
media-io/media-io-defs.h
media-io/video-io.h
media-io/audio-io.h
media-io/audio-math.h
media-io/video-frame.h
media-io/format-conversion.h
media-io/audio-resampler.h
media-io/video-scaler.h
media-io/media-remux.h
media-io/frame-rate.h)
set(libobs_util_SOURCES
util/array-serializer.c
util/file-serializer.c
util/base.c
util/platform.c
util/cf-lexer.c
util/bmem.c
util/config-file.c
util/lexer.c
util/dstr.c
util/utf8.c
util/crc32.c
util/text-lookup.c
util/cf-parser.c
util/profiler.c)
set(libobs_util_HEADERS
util/array-serializer.h
util/file-serializer.h
util/utf8.h
util/crc32.h
util/base.h
util/text-lookup.h
util/vc/vc_inttypes.h
util/vc/vc_stdbool.h
util/vc/vc_stdint.h
util/bmem.h
util/c99defs.h
util/util_uint128.h
util/cf-parser.h
util/threading.h
util/pipe.h
util/cf-lexer.h
util/darray.h
util/circlebuf.h
util/dstr.h
util/serializer.h
util/config-file.h
util/lexer.h
util/platform.h
util/profiler.h
util/profiler.hpp)
set(libobs_libobs_SOURCES
${libobs_PLATFORM_SOURCES}
obs-audio-controls.c
obs-avc.c
obs-encoder.c
obs-service.c
obs-source.c
obs-output.c
obs-output-delay.c
obs.c
obs-properties.c
obs-data.c
obs-hotkey.c
obs-hotkey-name-map.c
obs-module.c
obs-display.c
obs-view.c
obs-scene.c
obs-audio.c
obs-video.c)
set(libobs_libobs_HEADERS
${libobs_PLATFORM_HEADERS}
obs-audio-controls.h
obs-defs.h
obs-avc.h
obs-encoder.h
obs-service.h
obs-internal.h
obs.h
obs-ui.h
obs-properties.h
obs-data.h
obs-interaction.h
obs-hotkey.h
obs-hotkeys.h
obs-module.h
obs-scene.h
obs-source.h
obs-output.h
obs-ffmpeg-compat.h
obs.hpp)
set(libobs_SOURCES
${libobs_callback_SOURCES}
${libobs_graphics_SOURCES}
${libobs_mediaio_SOURCES}
${libobs_util_SOURCES}
${libobs_libobs_SOURCES})
set(libobs_HEADERS
${libobs_config_HEADERS}
${libobs_callback_HEADERS}
${libobs_graphics_HEADERS}
${libobs_mediaio_HEADERS}
${libobs_util_HEADERS}
${libobs_libobs_HEADERS})
source_group("callback\\Source Files" FILES ${libobs_callback_SOURCES})
source_group("callback\\Header Files" FILES ${libobs_callback_HEADERS})
source_group("graphics\\Source Files" FILES ${libobs_graphics_SOURCES})
source_group("graphics\\Header Files" FILES ${libobs_graphics_HEADERS})
source_group("libobs\\Source Files" FILES ${libobs_libobs_SOURCES})
source_group("libobs\\Header Files" FILES ${libobs_libobs_HEADERS})
source_group("media-io\\Source Files" FILES ${libobs_mediaio_SOURCES})
source_group("media-io\\Header Files" FILES ${libobs_mediaio_HEADERS})
source_group("util\\Source Files" FILES ${libobs_util_SOURCES})
source_group("util\\Header Files" FILES ${libobs_util_HEADERS})
add_library(libobs SHARED ${libobs_SOURCES} ${libobs_HEADERS})
set_target_properties(libobs PROPERTIES
OUTPUT_NAME obs
VERSION "0"
SOVERSION "0")
target_compile_definitions(libobs
PUBLIC
HAVE_OBSCONFIG_H)
if(NOT MSVC)
target_compile_options(libobs
PUBLIC
-mmmx
-msse
-msse2)
endif()
target_compile_options(libobs
PUBLIC
"${THREADS_DEFINITIONS}")
target_include_directories(libobs
PUBLIC
"$<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}>"
"$<BUILD_INTERFACE:${CMAKE_BINARY_DIR}/config>"
"$<INSTALL_INTERFACE:${OBS_INCLUDE_DESTINATION}>")
target_link_libraries(libobs
PRIVATE
${libobs_PLATFORM_DEPS}
${libobs_image_loading_LIBRARIES}
${OBS_JANSSON_IMPORT}
${FFMPEG_LIBRARIES}
${ZLIB_LIBRARIES}
PUBLIC
${THREADS_LIBRARIES})
install_obs_core(libobs EXPORT LibObs)
install_obs_data(libobs data libobs)
install_obs_headers(${libobs_HEADERS})
obs_install_additional(libobs)
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