faac.c
资源名称:tcpmp.rar [点击查看]
上传用户:wstnjxml
上传日期:2014-04-03
资源大小:7248k
文件大小:4k
源码类别:
Windows CE
开发平台:
C/C++
- /*
- * 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
- };