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ffmpeg / libavcodec / faac.c @ 5509bffa

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/*
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 * Interface to libfaac for aac encoding
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 * Copyright (c) 2002 Gildas Bazin <gbazin@netcourrier.com>
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 *
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 * This library is free software; you can redistribute it and/or
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 * modify it under the terms of the GNU Lesser General Public
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 * License as published by the Free Software Foundation; either
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 * version 2 of the License, or (at your option) any later version.
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 *
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 * This library is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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 * Lesser General Public License for more details.
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 *
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 * You should have received a copy of the GNU Lesser General Public
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 * License along with this library; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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 */
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/**
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 * @file faacaudio.c
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 * Interface to libfaac for aac encoding.
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 */
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#include "avcodec.h"
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#include <faac.h>
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typedef struct FaacAudioContext {
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    faacEncHandle faac_handle;
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} FaacAudioContext;
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static int Faac_encode_init(AVCodecContext *avctx)
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{
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    FaacAudioContext *s = avctx->priv_data;
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    faacEncConfigurationPtr faac_cfg;
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    unsigned long samples_input, max_bytes_output;
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    /* number of channels */
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    if (avctx->channels < 1 || avctx->channels > 6)
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        return -1;
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    s->faac_handle = faacEncOpen(avctx->sample_rate,
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                                 avctx->channels,
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                                 &samples_input, &max_bytes_output);
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    /* check faac version */
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    faac_cfg = faacEncGetCurrentConfiguration(s->faac_handle);
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    if (faac_cfg->version != FAAC_CFG_VERSION) {
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        av_log(avctx, AV_LOG_ERROR, "wrong libfaac version (compiled for: %d, using %d)\n", FAAC_CFG_VERSION, faac_cfg->version);
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        faacEncClose(s->faac_handle);
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        return -1;
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    }
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    /* put the options in the configuration struct */
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    faac_cfg->aacObjectType = LOW;
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    faac_cfg->mpegVersion = MPEG4;
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    faac_cfg->useTns = 0;
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    faac_cfg->allowMidside = 1;
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    faac_cfg->bitRate = avctx->bit_rate / avctx->channels;
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    faac_cfg->bandWidth = avctx->cutoff;
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    if(avctx->flags & CODEC_FLAG_QSCALE) {
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        faac_cfg->bitRate = 0;
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        faac_cfg->quantqual = avctx->global_quality / FF_QP2LAMBDA;
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    }
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    faac_cfg->outputFormat = 0;
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    faac_cfg->inputFormat = FAAC_INPUT_16BIT;
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    if (!faacEncSetConfiguration(s->faac_handle, faac_cfg)) {
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        av_log(avctx, AV_LOG_ERROR, "libfaac doesn't support this output format!\n");
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        return -1;
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    }
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    avctx->frame_size = samples_input / avctx->channels;
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    avctx->coded_frame= avcodec_alloc_frame();
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    avctx->coded_frame->key_frame= 1;
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    /* Set decoder specific info */
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    avctx->extradata_size = 0;
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    if (avctx->flags & CODEC_FLAG_GLOBAL_HEADER) {
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        unsigned char *buffer;
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        unsigned long decoder_specific_info_size;
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        if (!faacEncGetDecoderSpecificInfo(s->faac_handle, &buffer,
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                                           &decoder_specific_info_size)) {
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            avctx->extradata = buffer;
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            avctx->extradata_size = decoder_specific_info_size;
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        }
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    }
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    return 0;
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}
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int Faac_encode_frame(AVCodecContext *avctx,
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                      unsigned char *frame, int buf_size, void *data)
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{
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    FaacAudioContext *s = avctx->priv_data;
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    int bytes_written;
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    bytes_written = faacEncEncode(s->faac_handle,
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                                  data,
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                                  avctx->frame_size * avctx->channels,
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                                  frame,
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                                  buf_size);
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    return bytes_written;
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}
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int Faac_encode_close(AVCodecContext *avctx)
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{
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    FaacAudioContext *s = avctx->priv_data;
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    av_freep(&avctx->coded_frame);
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    //if (avctx->extradata_size) free(avctx->extradata);
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    faacEncClose(s->faac_handle);
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    return 0;
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}
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AVCodec faac_encoder = {
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    "aac",
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    CODEC_TYPE_AUDIO,
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    CODEC_ID_AAC,
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    sizeof(FaacAudioContext),
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    Faac_encode_init,
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    Faac_encode_frame,
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    Faac_encode_close
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};