ffmpeg pcm 编码aac问题急/。。。。。。。。。。。。。。。

ykmao10 2013-03-22 10:21:30

我现在有段pcm数据，数据是完好的，没问题，现在转成aac文件，可是不知为什么转出来的都不对代码很简单请大牛帮忙看看

int main(int argc, char **argv)

{

	if(argc < 3)

	{

		printf("argc number is error\n");

		return 0;

	}



	av_register_all();

	AVCodecContext *encodecCtx = NULL;

	AVCodec *encodec;

	AVPacket enpacket;

	AVFrame avframe;

	int gotframeptr;



	int frame_size = 0;

	int *samples = 0;

	int SAMPLESIZE = 0;

	encodec = avcodec_find_encoder(CODEC_ID_AAC);

	if(!encodec)

	{

		fprintf(stderr, "Unsupported encodec!\n");

		return -1;

	}

	encodecCtx= avcodec_alloc_context3(encodec);



	encodecCtx->channels = 2;

	encodecCtx->sample_fmt = AV_SAMPLE_FMT_S16;

	encodecCtx->sample_rate = 44100;

	encodecCtx->bit_rate = 128000;

	encodecCtx->profile = FF_PROFILE_AAC_LOW;

	encodecCtx->strict_std_compliance = FF_COMPLIANCE_EXPERIMENTAL;





	if((avcodec_open2(encodecCtx, encodec, NULL) < 0))

	{

		fprintf(stderr, "can't open  encodec!\n");

		return -1;

	}



	frame_size = encodecCtx->frame_size;

	samples = malloc(frame_size * 2 * encodecCtx->channels);

	SAMPLESIZE = frame_size * 2 * encodecCtx->channels;



	FILE *fin = NULL;

	fin = fopen(argv[1],"rb");

	if(!fin)

	{

		printf("open fin file error\n");

		return 0;

	}



	FILE *fout = NULL;

	fout = fopen(argv[2],"a+");

	if(!fout)

	{

		printf("open fout file error\n");

		return 0;

	}



	uint8_t *out_buf = (uint8_t*)malloc(encodecCtx->frame_size*8);

	memset(out_buf,0,encodecCtx->frame_size*8);

	int size;

	int len;

	while(1)

	{

		size = fread(samples,1,SAMPLESIZE,fin);

		if(size == 0)

		{

			printf("read elf\n");

			break;

		}

		avframe.data[0] = (uint8_t*)samples;

		avframe.linesize[0] =  SAMPLESIZE;

		avframe.extended_data = &avframe.data[0];

		avframe.nb_samples = encodecCtx->frame_size;

		av_init_packet(&enpacket);

		enpacket.data = NULL;

		enpacket.size = 0;

		len = avcodec_encode_audio(encodecCtx,out_buf,FF_MIN_BUFFER_SIZE,(short*)avframe.data[0]);

		int num = fwrite(out_buf,1,len,fout);

		if(num == 0)

		{

			printf("write error\n");

			sleep(1);

		}

		memset(out_buf,0,FF_MIN_BUFFER_SIZE);

	}

	av_free_packet(&enpacket);

	fclose(fout);

	fclose(fin);

	return 0;

}