/* * Interface to libfaac for aac encoding * Copyright (c) 2002 Gildas Bazin <gbazin@netcourrier.com> * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2 of the License, or (at your option) any later version. * * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ /** * @file faacaudio.c * Interface to libfaac for aac encoding. */ #include "avcodec.h" #include <faac.h> typedef struct FaacAudioContext { faacEncHandle faac_handle; } FaacAudioContext; static int Faac_encode_init(AVCodecContext *avctx) { FaacAudioContext *s = avctx->priv_data; faacEncConfigurationPtr faac_cfg; unsigned long samples_input, max_bytes_output; /* number of channels */ if (avctx->channels < 1 || avctx->channels > 6) return -1; s->faac_handle = faacEncOpen(avctx->sample_rate, avctx->channels, &samples_input, &max_bytes_output); /* check faac version */ faac_cfg = faacEncGetCurrentConfiguration(s->faac_handle); if (faac_cfg->version != FAAC_CFG_VERSION) { av_log(avctx, AV_LOG_ERROR, "wrong libfaac version (compiled for: %d, using %d)\n", FAAC_CFG_VERSION, faac_cfg->version); faacEncClose(s->faac_handle); return -1; } /* put the options in the configuration struct */ faac_cfg->aacObjectType = LOW; faac_cfg->mpegVersion = MPEG4; faac_cfg->useTns = 0; faac_cfg->allowMidside = 1; faac_cfg->bitRate = avctx->bit_rate / avctx->channels; if(avctx->flags & CODEC_FLAG_QSCALE) { faac_cfg->bitRate = 0; faac_cfg->quantqual = avctx->global_quality / FF_QP2LAMBDA; } faac_cfg->outputFormat = 0; faac_cfg->inputFormat = FAAC_INPUT_16BIT; if (!faacEncSetConfiguration(s->faac_handle, faac_cfg)) { av_log(avctx, AV_LOG_ERROR, "libfaac doesn't support this output format!\n"); return -1; } avctx->frame_size = samples_input / avctx->channels; avctx->coded_frame= avcodec_alloc_frame(); avctx->coded_frame->key_frame= 1; /* Set decoder specific info */ avctx->extradata_size = 0; if (avctx->flags & CODEC_FLAG_GLOBAL_HEADER) { unsigned char *buffer; unsigned long decoder_specific_info_size; if (!faacEncGetDecoderSpecificInfo(s->faac_handle, &buffer, &decoder_specific_info_size)) { avctx->extradata = buffer; avctx->extradata_size = decoder_specific_info_size; } } return 0; } int Faac_encode_frame(AVCodecContext *avctx, unsigned char *frame, int buf_size, void *data) { FaacAudioContext *s = avctx->priv_data; int bytes_written; bytes_written = faacEncEncode(s->faac_handle, data, avctx->frame_size * avctx->channels, frame, buf_size); return bytes_written; } int Faac_encode_close(AVCodecContext *avctx) { FaacAudioContext *s = avctx->priv_data; av_freep(&avctx->coded_frame); //if (avctx->extradata_size) free(avctx->extradata); faacEncClose(s->faac_handle); return 0; } AVCodec faac_encoder = { "aac", CODEC_TYPE_AUDIO, CODEC_ID_AAC, sizeof(FaacAudioContext), Faac_encode_init, Faac_encode_frame, Faac_encode_close };