run demo

build-demo-mp3.sh

+#!/bin/bash
+
+#set -eo pipefail
+
+WORKPATH=$(cd $(dirname $0); pwd)
+
+DEMO_PATH=$WORKPATH/demo_transcode_mp3
+
+echo "WORKPATH"=$WORKPATH
+
+rm -rf ${WORKPATH}/demo_transcode_mp3/transcode_mp3.js ${WORKPATH}/demo_transcode_mp3/transcode_mp3.wasm
+
+FFMPEG_ST=yes
+
+EMSDK=/emsdk
+
+THIRD_DIR=${WORKPATH}/lib/third/build
+
+DEBUG=""
+DEBUG="-g -fno-inline -gseparate-dwarf=/code/demo/temp.debug.wasm -s SEPARATE_DWARF_URL=http://localhost:5000/temp.debug.wasm"
+
+#--closure 压缩胶水代码，有可能会造成变量重复定义。生产发布可设为1
+OPTIM_FLAGS="-O1 $DEBUG --closure 0"
+
+if [[ "$FFMPEG_ST" != "yes" ]]; then
+  EXTRA_FLAGS=(
+    -pthread
+    -s USE_PTHREADS=1                             # enable pthreads support
+    -s PROXY_TO_PTHREAD=1                         # detach main() from browser/UI main thread
+    -o ${DEMO_PATH}/transcode_mp3.js
+  )
+else
+  EXTRA_FLAGS=(
+    -o ${DEMO_PATH}/transcode_mp3.js
+  )
+fi
+
+FLAGS=(
+  -I$WORKPATH/lib/ffmpeg-emcc/include -L$WORKPATH/lib/ffmpeg-emcc/lib -I$THIRD_DIR/include -L$THIRD_DIR/lib
+  -Wno-deprecated-declarations -Wno-pointer-sign -Wno-implicit-int-float-conversion -Wno-switch -Wno-parentheses -Qunused-arguments
+  -lavdevice -lavfilter -lavformat -lavcodec -lswresample -lswscale -lavutil -lpostproc 
+  -lm -lharfbuzz -lfribidi -lass -lx264 -lx265 -lvpx -lwavpack -lmp3lame -lfdk-aac -lvorbis -lvorbisenc -lvorbisfile -logg -ltheora -ltheoraenc -ltheoradec -lz -lfreetype -lopus -lwebp
+  $DEMO_PATH/audio/FFAudioDecoder.cpp $DEMO_PATH/audio/FFAudioEncoder.cpp $DEMO_PATH/ffmbase/FFMBase.cpp $DEMO_PATH/main.cpp -I $DEMO_PATH/audio -I $DEMO_PATH/ffmbase -I $DEMO_PATH
+  
+  -s FORCE_FILESYSTEM=1
+  -s WASM=1
+  -s USE_SDL=2                                  # use SDL2
+  -s INVOKE_RUN=0                               # not to run the main() in the beginning
+  -s EXIT_RUNTIME=1                             # exit runtime after execution
+  -s MODULARIZE=1                               # 延迟加载 use modularized version to be more flexible
+  -s EXPORT_NAME="createTranscodeMp3"             # assign export name for browser
+  -s EXPORTED_FUNCTIONS="[_main,_malloc,_free]"  # export main and proxy_main funcs
+  -s EXPORTED_RUNTIME_METHODS="[FS, cwrap, ccall, setValue, writeAsciiToMemory]"   # export preamble funcs
+  -s INITIAL_MEMORY=134217728                   # 64 KB * 1024 * 16 * 2047 = 2146435072 bytes ~= 2 GB
+  -s ALLOW_MEMORY_GROWTH=1
+  --pre-js $WORKPATH/pre.js
+  --post-js $WORKPATH/post.js
+  $OPTIM_FLAGS
+  ${EXTRA_FLAGS[@]}
+)
+echo "FFMPEG_EM_FLAGS=${FLAGS[@]}"
+
+em++ "${FLAGS[@]}"
+
+cp  ${WORKPATH}/demo_transcode_mp3/transcode_mp3.*  ${WORKPATH}/demo_transcode_mp3/build

demo_transcode_mp3/CMakeLists.txt

@@ -3,11 +3,11 @@ project(transcode_mp3)
 
 set(CMAKE_CXX_STANDARD 17)
 
-set(CMAKE_EXECUTABLE_SUFFIX ".html") # 编译生成.html
-
-#pre.js and pro.js path
-# set(PRE_PATH "/code")
-# set(POST_PATH "/code")
+# set(CMAKE_EXECUTABLE_SUFFIX ".html") # 编译生成.html
+set( CMAKE_VERBOSE_MAKEFILE on )
+# pre.js and pro.js path
+set(PRE_PATH "/code")
+set(POST_PATH "/code")
 
 include_directories("../lib/ffmpeg-emcc/include")
 link_directories("../lib/ffmpeg-emcc/lib")
@@ -23,21 +23,26 @@ add_executable(${PROJECT_NAME} ${DIR})
 add_subdirectory(audio)
 add_subdirectory(ffmbase)
 
-
-set_target_properties(transcode_mp3 PROPERTIES LINK_FLAGS "-s FORCE_FILESYSTEM=1")
-set_target_properties(transcode_mp3 PROPERTIES LINK_FLAGS "-s WASM=1")
-set_target_properties(transcode_mp3 PROPERTIES LINK_FLAGS "-s USE_SDL=2")
-set_target_properties(transcode_mp3 PROPERTIES LINK_FLAGS "-s INVOKE_RUN=0")
-set_target_properties(transcode_mp3 PROPERTIES LINK_FLAGS "-s EXIT_RUNTIME=1")
-set_target_properties(transcode_mp3 PROPERTIES LINK_FLAGS "-s MODULARIZE=1")
-set_target_properties(transcode_mp3 PROPERTIES LINK_FLAGS "-s EXPORT_NAME=${PROJECT_NAME}")
-set_target_properties(transcode_mp3 PROPERTIES LINK_FLAGS "-s EXPORTED_FUNCTIONS=[_main,_malloc,_free]")
-set_target_properties(transcode_mp3 PROPERTIES LINK_FLAGS "-s EXPORTED_RUNTIME_METHODS=[FS, cwrap, ccall, setValue, writeAsciiToMemory]")
-set_target_properties(transcode_mp3 PROPERTIES LINK_FLAGS "-s INITIAL_MEMORY=134217728")
-# set_target_properties(transcode_mp3 PROPERTIES LINK_FLAGS "-s TOTAL_MEMORY=134217728")
-# set_target_properties(transcode_mp3 PROPERTIES LINK_FLAGS "-s ALLOW_MEMORY_GROWTH=1")
-# set_target_properties(transcode_mp3 PROPERTIES LINK_FLAGS "--pre-js ${PRE_PATH}/pre.js")
-# set_target_properties(transcode_mp3 PROPERTIES LINK_FLAGS "--post-js ${POST_PATH}/post.js")
+set_target_properties(transcode_mp3 PROPERTIES LINK_FLAGS "\
+    -Wno-deprecated-declarations \
+    -Wno-pointer-sign \
+    -Wno-implicit-int-float-conversion \
+    -Wno-switch -Wno-parentheses\
+    -Qunused-arguments \
+    -s FORCE_FILESYSTEM=1 \
+    -s WASM=1 \
+    -s USE_SDL=2 \
+    -s INVOKE_RUN=0 \
+    -s EXIT_RUNTIME=1 \
+    -s MODULARIZE=1 \
+    -s EXPORT_NAME=\"createTrancodeMp3\" \
+    -s EXPORTED_FUNCTIONS=\"[_main,_malloc,_free]\" \
+    -s EXPORTED_RUNTIME_METHODS=\"[FS, cwrap, ccall, setValue, writeAsciiToMemory]\" \
+    -s INITIAL_MEMORY=134217728 \
+    -s ALLOW_MEMORY_GROWTH=1 \
+    --pre-js ${PRE_PATH}/pre.js \
+    --post-js ${POST_PATH}/post.js \
+    ")
 
 target_link_libraries(${PROJECT_NAME} PRIVATE audio)
 target_link_libraries(${PROJECT_NAME} PRIVATE ffmbase)

demo_transcode_mp3/audio/FFAudioDecoder.cpp

@@ -16,7 +16,7 @@ namespace FFM {
 		avformat_free_context(pFormatCtx);
 
 		AVFormatContext *_pFormatCtx = avformat_alloc_context();
-		// AVDictionary ò key =rtbufsize , value = 18432000
+		// ����AVDictionary ������ key =rtbufsize , value = 18432000
 		AVDictionary *format_opts = nullptr;
 		//av_dict_set_int(&format_opts, "video_device_number", 0, 0);
 
@@ -56,10 +56,11 @@ namespace FFM {
 
 	void FFAudioDecoder::startDecoder()
 	{
-		std::thread t([this]() {
-			decodeAudio();
-		});
-		t.join();
+		// std::thread t([this]() {
+		// 	decodeAudio();
+		// });
+		// t.join();
+		decodeAudio();
 	}
 
 	int FFAudioDecoder::decode(int *gotframe)
@@ -82,10 +83,10 @@ namespace FFM {
 
 			*gotframe = 1;
 
-			if (m_pPkt->pts == AV_NOPTS_VALUE)
-			{
-				printf("AV_NOPTS_VALUE\n");
-
+			if (m_pPkt->pts == AV_NOPTS_VALUE)
+			{
+				printf("AV_NOPTS_VALUE\n");
+
 				if (m_pPkt->pts == AV_NOPTS_VALUE) {
 					//Write PTS  
 					AVRational time_base1 = m_pCodecCtx->time_base;
@@ -97,7 +98,7 @@ namespace FFM {
 					m_pPkt->dts = m_pPkt->pts;
 					m_pPkt->duration = (double)calc_duration / (double)(av_q2d(time_base1)*AV_TIME_BASE);
 					m_frameIndex++;
-				}
+				}
 			}
 		}
 

demo_transcode_mp3/main.cpp

@@ -29,6 +29,7 @@ using namespace FFM;
 
 EM_PORT_API(int) tanscode_mp3(std::string &in_file, std::string &out_file)
 {
+	printf("in_file: %s, out_file: %s\n", in_file.c_str(), out_file.c_str());
 	FFAudioDecoder decoder(in_file); 
 	FFAudioEncoder encoder(out_file, decoder.getInSream());
 
@@ -42,6 +43,7 @@ EM_PORT_API(int) tanscode_mp3(std::string &in_file, std::string &out_file)
 	decoder.setFrameCallBack(audio_frame_callBack);
 	decoder.startDecoder();
 
+	return 0;
 }
 
 int main(int argc, char *argv[])