static av_cold int g726_init(AVCodecContext * avctx) { AVG726Context* c = (AVG726Context*)avctx->priv_data; unsigned int index= (avctx->bit_rate + avctx->sample_rate/2) / avctx->sample_rate - 2; if ( (avctx->bit_rate != 16000 && avctx->bit_rate != 24000 && avctx->bit_rate != 32000 && avctx->bit_rate != 40000)) { av_log(avctx, AV_LOG_ERROR, "G726: unsupported audio format\n"); return -1; } if (avctx->sample_rate != 8000 && avctx->strict_std_compliance>FF_COMPLIANCE_INOFFICIAL) { av_log(avctx, AV_LOG_ERROR, "G726: unsupported audio format\n"); return -1; } if(avctx->channels != 1){ av_log(avctx, AV_LOG_ERROR, "Only mono is supported\n"); return -1; } if(index>3){ av_log(avctx, AV_LOG_ERROR, "Unsupported number of bits %d\n", index+2); return -1; } g726_reset(&c->c, index); c->code_size = c->c.tbls->bits; c->bit_buffer = 0; c->bits_left = 0; avctx->coded_frame = avcodec_alloc_frame(); if (!avctx->coded_frame) return AVERROR(ENOMEM); avctx->coded_frame->key_frame = 1; return 0; }