qtopia2加入aac音频解码功能

板子helper2416    芯片是三星的s3c2416  arm平台   本机系统： opensuse

qtopia2.2中的播放mp4视频没有声音, 后来发现是没有aac音频解码

这就得从ffmpeg的源码中入手了,源码中有带了faac.c(编码), faad.c(解码),但是没有编译进去


进入目录
qtopia/src/3rdparty/libraries/libavcodec
查看版本
avcodec.h
// 可知对应ffmpeg的版本号
#define FFMPEG_VERSION_INT     0x000409
#define FFMPEG_VERSION         "0.4.9-pre1"
#define LIBAVCODEC_BUILD       4757


我们只要解码的,用来播放声音
faad.c
#include "avcodec.h"
#include "faad.h" // 这个头由faad库提供  得另外编译的


allcodecs.c
#ifdef CONFIG_FAAD
#ifdef CONFIG_AAC_DECODER
    register_avcodec(&aac_decoder);
#endif //CONFIG_AAC_DECODER


要使能aad解码就得定义CONFIG_FAAD 与CONFIG_AAC_DECODER 两个宏


libavcodec.pri
CONFIG_VORBIS_DECODER
改成
CONFIG_VORBIS_DECODER \
CONFIG_FAAD \
CONFIG_AAC_DECODER 


libavcodec.pro
contains(DEFINES,CONFIG_VORBIS_DECODER) {
    SOURCES     += vorbis.c
}
的后面加上


#JYX_MODI add
contains(DEFINES,CONFIG_AAC_DECODER) {
    SOURCES     += faad.c
    INCLUDEPATH +=  ../libfaad2 
    PACKAGE_DEPENDS += libfaad2
    LIBS    += -lfaad 
}


现在来把faad整合进去
faac库
http://www.audiocoding.com/faac.html
下载faad2-2.7.tar.bz2
解压faad
tar -xvf faad2-2.7.tar.bz2
cd faad2-2.7
./configure --host=arm-linux
cp include/* config.h libfaad/
修改libfaad/common.h
38行
#ifdef HAVE_CONFIG_H
#  include "../config.h"
#endif
为
#ifdef HAVE_CONFIG_H
#  include "config.h"
#endif


挎贝到qtopia源码目录中
cp libfaad/ ~/workspace/qtopia2.2/qtopia/src/3rdparty/libraries/libfaad2 -r
在libfaad2下新建个libfaad2.pro
TEMPLATE    =   lib
CONFIG      -=  qt
CONFIG      -= warn_on


INCLUDEPATH +=  ./
DEPENDPATH      += ./ 
DEFINES += HAVE_CONFIG_H


SOURCES += bits.c cfft.c decoder.c drc.c \
             drm_dec.c error.c filtbank.c \
             ic_predict.c is.c lt_predict.c \
             mdct.c mp4.c ms.c output.c pns.c \
             ps_dec.c ps_syntax.c \
             pulse.c specrec.c syntax.c tns.c hcr.c huffman.c \
             rvlc.c ssr.c ssr_fb.c ssr_ipqf.c common.c \
             sbr_dct.c sbr_e_nf.c sbr_fbt.c sbr_hfadj.c sbr_hfgen.c \
             sbr_huff.c sbr_qmf.c sbr_syntax.c sbr_tf_grid.c sbr_dec.c


TARGET          =   faad
DESTDIR     =   $$(QPEDIR)/lib
VERSION     =   2.0.0
PACKAGE_NAME    = libfaad2




qtopia/src/general.pri
约187行处
contains(PLUGIN_PROJECTS,3rdparty/plugins/codecs/libffmpeg) {
    LIBRARY_PROJECTS+=\
    3rdparty/libraries/libavcodec\
    3rdparty/libraries/libavformat
}
改成


contains(PLUGIN_PROJECTS,3rdparty/plugins/codecs/libffmpeg) {
    LIBRARY_PROJECTS+=\
    3rdparty/libraries/libfaad2 \
    3rdparty/libraries/libavcodec\
    3rdparty/libraries/libavformat
}


qtopia/src/projects.pri
37行
    LIBRARY_PROJECTS -= 3rdparty/libraries/libavcodec \
        3rdparty/libraries/libavformat \
        3rdparty/libraries/amr


改成
    LIBRARY_PROJECTS -= 3rdparty/libraries/libavcodec \
        3rdparty/libraries/libavformat \
        3rdparty/libraries/libfaad2 \
        3rdparty/libraries/amr


84行处
    # only used with ffmpeg/amr
    !contains(PLUGIN_PROJECTS,3rdparty/plugins/codecs/libffmpeg) {
    !contains(PLUGIN_PROJECTS,3rdparty/plugins/codecs/libamr):LIBRARY_PROJECTS-=3rdparty/libraries/amr
    LIBRARY_PROJECTS-=3rdparty/libraries/libavcodec\
        3rdparty/libraries/libavformat
    }
改成
    # only used with ffmpeg/amr
    !contains(PLUGIN_PROJECTS,3rdparty/plugins/codecs/libffmpeg) {
    !contains(PLUGIN_PROJECTS,3rdparty/plugins/codecs/libamr):LIBRARY_PROJECTS-=3rdparty/libraries/amr
    LIBRARY_PROJECTS-=3rdparty/libraries/libavcodec\
        3rdparty/libraries/libfaad2 \
        3rdparty/libraries/libavformat
    }

重新编译就可以了. 更新了libfaad 与libavcodec, 如果有段错误,则libavcodec工程需要clean后再编译

 作者：帅得不敢出门   c++哈哈堂群：31843264  转载请保留此信息