static av_cold int vorbis_encode_init(AVCodecContext *avccontext) { vorbis_enc_context *venc = avccontext->priv_data; if (avccontext->channels != 2) { av_log(avccontext, AV_LOG_ERROR, "Current Libav Vorbis encoder only supports 2 channels.\n"); return -1; } create_vorbis_context(venc, avccontext); if (avccontext->flags & CODEC_FLAG_QSCALE) venc->quality = avccontext->global_quality / (float)FF_QP2LAMBDA / 10.; else venc->quality = 0.03; venc->quality *= venc->quality; avccontext->extradata_size = put_main_header(venc, (uint8_t**)&avccontext->extradata); avccontext->frame_size = 1 << (venc->log2_blocksize[0] - 1); avccontext->coded_frame = avcodec_alloc_frame(); avccontext->coded_frame->key_frame = 1; return 0; }