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-rw-r--r--cmake/FindG729.cmake36
1 files changed, 36 insertions, 0 deletions
diff --git a/cmake/FindG729.cmake b/cmake/FindG729.cmake
index 4a30ba0..1fbfeeb 100644
--- a/cmake/FindG729.cmake
+++ b/cmake/FindG729.cmake
@@ -1,14 +1,50 @@
+INCLUDE(CMakePushCheckState)
+INCLUDE(CheckCSourceCompiles)
+
FIND_PATH(G729_INCLUDE_DIR bcg729/decoder.h)
FIND_LIBRARY(G729_LIBRARY NAMES bcg729)
IF(G729_INCLUDE_DIR AND G729_LIBRARY)
SET(G729_FOUND TRUE)
+
+ # The bcg729 API was changed in 1.0.2 to add support for G.729 Annex B.
+ # This checks whether we are dealing with the old or new API.
+ CMAKE_PUSH_CHECK_STATE()
+ SET(CMAKE_REQUIRED_INCLUDES "${INCLUDE_DIRECTORIES}" "${G729_INCLUDE_DIR}")
+ SET(CMAKE_REQUIRED_LIBRARIES "${G729_LIBRARY}")
+ SET(CMAKE_REQUIRED_QUIET TRUE)
+ # Try to compile something using the old (pre-1.0.2) API.
+ #
+ # We cannot do it the other way around, as initBcg729EncoderChannel()
+ # did not have a prototype before 1.0.2, thus compilation would not fail
+ # when passing it an extra argument.
+ CHECK_C_SOURCE_COMPILES("
+ #include <bcg729/encoder.h>
+
+ int main() {
+ /* This function requires an argument since 1.0.2 */
+ initBcg729EncoderChannel();
+ return 0;
+ }
+ " G729_OLD_API)
+ CMAKE_POP_CHECK_STATE()
+
+ IF (G729_OLD_API)
+ SET(G729_ANNEX_B FALSE)
+ ELSE (G729_OLD_API)
+ SET(G729_ANNEX_B TRUE)
+ ENDIF (G729_OLD_API)
ENDIF(G729_INCLUDE_DIR AND G729_LIBRARY)
IF(G729_FOUND)
IF (NOT G729_FIND_QUIETLY)
MESSAGE(STATUS "Found bcg729 includes: ${G729_INCLUDE_DIR}/bcg729/decoder.h")
MESSAGE(STATUS "Found bcg729 library: ${G729_LIBRARY}")
+ IF (G729_ANNEX_B)
+ MESSAGE(STATUS "bcg729 supports Annex B; using the new (1.0.2) API")
+ ELSE (G729_ANNEX_B)
+ MESSAGE(STATUS "bcg729 does not support Annex B; using the old (pre-1.0.2) API")
+ ENDIF (G729_ANNEX_B)
ENDIF (NOT G729_FIND_QUIETLY)
ELSE(G729_FOUND)
IF (G729_FIND_REQUIRED)