freeswitch 修改编码协商顺序优先G729

最新推荐文章于 2023-04-24 08:53:48 发布

java_lilin

最新推荐文章于 2023-04-24 08:53:48 发布

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分类专栏： freeswitch 文章标签： freeswitch

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在freeswitch编码协商中一般网关传过来的支持pcma、g729 以下是协商的日志：

2021-02-09 13:21:29.118569 [DEBUG] switch_core_media.c:5592 Audio Codec Compare [PCMA:8:8000:20:64000:1]/[G729:18:8000:20:8000:1]
2021-02-09 13:21:29.118569 [DEBUG] switch_core_media.c:5592 Audio Codec Compare [PCMA:8:8000:20:64000:1]/[G722:9:8000:20:64000:1]
2021-02-09 13:21:29.118569 [DEBUG] switch_core_media.c:5592 Audio Codec Compare [PCMA:8:8000:20:64000:1]/[PCMU:0:8000:20:64000:1]
2021-02-09 13:21:29.118569 [DEBUG] switch_core_media.c:5592 Audio Codec Compare [PCMA:8:8000:20:64000:1]/[PCMA:8:8000:20:64000:1]
2021-02-09 13:21:29.118569 [DEBUG] switch_core_media.c:5647 Audio Codec Compare [PCMA:8:8000:20:64000:1] ++++ is saved as a match
2021-02-09 13:21:29.118569 [DEBUG] switch_core_media.c:5592 Audio Codec Compare [G729:18:8000:20:8000:1]/[G729:18:8000:20:8000:1]
2021-02-09 13:21:29.118569 [DEBUG] switch_core_media.c:5647 Audio Codec Compare [G729:18:8000:20:8000:1] ++++ is saved as a match
2021-02-09 13:21:29.118569 [DEBUG] switch_core_media.c:5592 Audio Codec Compare [G729:18:8000:20:8000:1]/[G722:9:8000:20:64000:1]
2021-02-09 13:21:29.118569 [DEBUG] switch_core_media.c:5592 Audio Codec Compare [G729:18:8000:20:8000:1]/[PCMU:0:8000:20:64000:1]
2021-02-09 13:21:29.118569 [DEBUG] switch_core_media.c:5592 Audio Codec Compare [G729:18:8000:20:8000:1]/[PCMA:8:8000:20:64000:1]

如果freeswitch 装了bcg729 https://github.com/xadhoom/mod_bcg729 就支持729 ，在vars.xml添加729新编码但是协商结果优先使用的是pcma

2021-02-09 13:21:29.118569 [DEBUG] switch_core_media.c:3837 Set Codec sofia/internal/1002@192.168.70.88 PCMA/8000 20 ms 160 samples 8000 bits 1 channels

如果要优先729 在使用pcma怎么处理？

查看源码 switch_core_media.c 默认就是0 所以只要改下就行了

“Audio Codec Compare [%s:%d:%u:%d:%u:%d] ++++ is saved as a match”找到这行的下面

....

if (j == 0) {
                           a_engine->cur_payload_map = pmap;
                           a_engine->cur_payload_map->current = 1;
                           switch_log_printf(SWITCH_CHANNEL_SESSION_LOG(session), SWITCH_LOG_WARNING, "lilin23=%s\n",matches[j].map->rm_encoding);
                           if (a_engine->rtp_session) {
                               switch_rtp_set_default_payload(a_engine->rtp_session, pmap->pt);
                           }
}

默认是0 可以根据自己的逻辑来重新实现就行了当然你的网关确定都支持G729 就直接在vars.xml 删除pcma就行

修改后重新编译就能支持自己想要的编码优先了