PJSIP添加G729编码

1.第一步

config_site中添加支持G729

#define PJMEDIA_HAS_BCG729 1

2.第二步

下载BCG729源代码到本地（git clone git://git.linphone.org/bcg729.git）

3.第三步

运行PJSIP的configure命令时设置bcg729的源代码位置，参考：https://trac.pjsip.org/repos/ticket/2029

./configure --with-bcg729

4.第四步

编译g729，参考：https://github.com/BelledonneCommunications/bcg729

cmake . -DCMAKE_INSTALL_PREFIX=/Users/xx/Documents/ThirdParty/bcg729/Output/lib

make

make install

5.第五步

复制编译好的libbcg729.a和BCG729源代码中的include中的decoder.h   encoder.h到项目中就可以了

6.检查是否支持

const unsigned kCodecInfoSize = 64;    pjsua_codec_info codecInfo[kCodecInfoSize];    unsigned codecCount = kCodecInfoSize;    pj_status_t status = pjsua_enum_codecs(codecInfo, &codecCount);    if (status != PJ_SUCCESS) {        NSLog(@"Error getting list of codecs");    } else {        for (NSUInteger i = 0; i < codecCount; i++) {            NSString *codecIdentifier = [NSString stringWithPJString:codecInfo[i].codec_id];             NSLog(@"codec = %@",codecIdentifier);                }

    }

+ (NSString *)stringWithPJString:(pj_str_t)pjString {    NSString *result = [[NSString alloc] initWithBytes:pjString.ptr length:(NSUInteger)pjString.slen encoding:NSUTF8StringEncoding];    return result ?: @"";

}

7.第七步 PJSIP priorityForCodec方法中添加@"G729/8000/1": @(133)