mirror of
https://github.com/FFmpeg/FFmpeg.git
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134 lines
4.0 KiB
C
134 lines
4.0 KiB
C
/*
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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 file is part of FFmpeg.
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*
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* FFmpeg 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 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg 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 FFmpeg; 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 = 1;
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faac_cfg->inputFormat = FAAC_INPUT_16BIT;
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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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faac_cfg->outputFormat = 0;
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}
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}
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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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return 0;
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}
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static 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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static 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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};
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