Handle tias_btw parameter somehow.

[ekr]

if (desc.mName == "H264") {
h264_config = new VideoCodecConfigH264;
strncpy(h264_config->sprop_parameter_sets,
desc.mSpropParameterSets.c_str(),
sizeof(h264_config->sprop_parameter_sets));
h264_config->packetization_mode = desc.mPacketizationMode;
h264_config->profile_level_id = desc.mProfileLevelId;
h264_config->max_mbps = desc.mMaxMbps;
h264_config->max_fs = desc.mMaxFs;
h264_config->max_cpb = desc.mMaxCpb;
h264_config->max_dpb = desc.mMaxDpb;
h264_config->max_br = desc.mMaxBr;
h264_config->tias_bw = 0; // TODO
}