frame.c

《Visual C++小波变换技术与工程实践》作者：靳济芳。书上的代码。第3章：语音的去噪处理

			hEncoder->overlapBuff[channel],
			MOVERLAPPED);

		if (coderInfo[channel].block_type == ONLY_SHORT_WINDOW) {
			for (k = 0; k < 8; k++) {
				specFilter(hEncoder->freqBuff[channel]+k*BLOCK_LEN_SHORT,
					sampleRate, bandWidth, BLOCK_LEN_SHORT);
			}
		} else {
			specFilter(hEncoder->freqBuff[channel], sampleRate,
				bandWidth, BLOCK_LEN_LONG);
		}
	}

	/* TMP：建立sfb补偿表和其他的数据*/
	for (channel = 0; channel < numChannels; channel++) {
		channelInfo[channel].msInfo.is_present = 0;

		if (coderInfo[channel].block_type == ONLY_SHORT_WINDOW) {
			coderInfo[channel].max_sfb = hEncoder->srInfo->num_cb_short;
			coderInfo[channel].nr_of_sfb = hEncoder->srInfo->num_cb_short;

			coderInfo[channel].num_window_groups = 1;
			coderInfo[channel].window_group_length[0] = 8;
			coderInfo[channel].window_group_length[1] = 0;
			coderInfo[channel].window_group_length[2] = 0;
			coderInfo[channel].window_group_length[3] = 0;
			coderInfo[channel].window_group_length[4] = 0;
			coderInfo[channel].window_group_length[5] = 0;
			coderInfo[channel].window_group_length[6] = 0;
			coderInfo[channel].window_group_length[7] = 0;

			offset = 0;
			for (sb = 0; sb < coderInfo[channel].nr_of_sfb; sb++) {
				coderInfo[channel].sfb_offset[sb] = offset;
				offset += hEncoder->srInfo->cb_width_short[sb];
			}
			coderInfo[channel].sfb_offset[coderInfo[channel].nr_of_sfb] = offset;
		} else {
			coderInfo[channel].max_sfb = hEncoder->srInfo->num_cb_long;
			coderInfo[channel].nr_of_sfb = hEncoder->srInfo->num_cb_long;

			coderInfo[channel].num_window_groups = 1;
			coderInfo[channel].window_group_length[0] = 1;

			offset = 0;
			for (sb = 0; sb < coderInfo[channel].nr_of_sfb; sb++) {
				coderInfo[channel].sfb_offset[sb] = offset;
				offset += hEncoder->srInfo->cb_width_long[sb];
			}
			coderInfo[channel].sfb_offset[coderInfo[channel].nr_of_sfb] = offset;
		}
	}

	/* 完成TNS分析并进行滤波*/
	for (channel = 0; channel < numChannels; channel++) {
		if ((!channelInfo[channel].lfe) && (useTns)) {
			TnsEncode(&(coderInfo[channel].tnsInfo),
				coderInfo[channel].max_sfb,
				coderInfo[channel].max_sfb,
				coderInfo[channel].block_type,
				coderInfo[channel].sfb_offset,
				hEncoder->freqBuff[channel]);
		} else {
			coderInfo[channel].tnsInfo.tnsDataPresent = 0;      /* 对于LFE不应用TNS */
		}
	}

	for(channel = 0; channel < numChannels; channel++)
	{
		if((coderInfo[channel].tnsInfo.tnsDataPresent != 0) && (useTns))
			tnsInfo_for_LTP = &(coderInfo[channel].tnsInfo);
		else
			tnsInfo_for_LTP = NULL;

		if(channelInfo[channel].present && (!channelInfo[channel].lfe) &&
			(coderInfo[channel].block_type != ONLY_SHORT_WINDOW) &&
			(mpegVersion == MPEG4) && (aacObjectType == LTP)) 
		{
			LtpEncode(hEncoder,
				&coderInfo[channel],
				&(coderInfo[channel].ltpInfo),
				tnsInfo_for_LTP,
				hEncoder->freqBuff[channel],
				hEncoder->ltpTimeBuff[channel]);
		} else {
			coderInfo[channel].ltpInfo.global_pred_flag = 0;
		}
	}

	for(channel = 0; channel < numChannels; channel++)
	{
		if ((aacObjectType == MAIN) && (!channelInfo[channel].lfe)) {
			int numPredBands = min(coderInfo[channel].max_pred_sfb, coderInfo[channel].nr_of_sfb);
			PredCalcPrediction(hEncoder->freqBuff[channel], 
				coderInfo[channel].requantFreq,
				coderInfo[channel].block_type,
				numPredBands,
				(coderInfo[channel].block_type==ONLY_SHORT_WINDOW)?
				hEncoder->srInfo->cb_width_short:hEncoder->srInfo->cb_width_long,
				coderInfo,
				channelInfo,
				channel); 
		} else {
			coderInfo[channel].pred_global_flag = 0;
		}
	}

	MSEncode(coderInfo, channelInfo, hEncoder->freqBuff, numChannels, allowMidside);

	/* 进行量化并完成信号的编码*/
	bitsToUse = (int)(bitRate*FRAME_LEN/sampleRate+0.5);
	for (channel = 0; channel < numChannels; channel++) {
		if (coderInfo[channel].block_type == ONLY_SHORT_WINDOW) {
			AACQuantize(&coderInfo[channel], &hEncoder->psyInfo[channel],
				&channelInfo[channel], hEncoder->srInfo->cb_width_short,
				hEncoder->srInfo->num_cb_short,	hEncoder->freqBuff[channel], bitsToUse);
		} else {
			AACQuantize(&coderInfo[channel], &hEncoder->psyInfo[channel],
				&channelInfo[channel], hEncoder->srInfo->cb_width_long,
				hEncoder->srInfo->num_cb_long, hEncoder->freqBuff[channel], bitsToUse);
		}
	}

	MSReconstruct(coderInfo, channelInfo, numChannels);

	for (channel = 0; channel < numChannels; channel++) 
	{
		/* 如果是短窗滤波，信号重建不需要应用预测*/
		if ((coderInfo[channel].block_type == ONLY_SHORT_WINDOW)) {
			int sind;
			for (sind = 0; sind < 1024; sind++) {
				coderInfo[channel].requantFreq[sind] = 0.0;
			}
		} else {

			if((coderInfo[channel].tnsInfo.tnsDataPresent != 0) && (useTns))
				tnsDecInfo = &(coderInfo[channel].tnsInfo);
			else
				tnsDecInfo = NULL;
			
			if ((!channelInfo[channel].lfe) && (aacObjectType == LTP))
{  /* 对于LFE信道不需要应用重建技术*/

				LtpReconstruct(&coderInfo[channel], &(coderInfo[channel].ltpInfo),
					coderInfo[channel].requantFreq);

				if(tnsDecInfo != NULL)
					TnsDecodeFilterOnly(&(coderInfo[channel].tnsInfo), coderInfo[channel].nr_of_sfb,
					coderInfo[channel].max_sfb, coderInfo[channel].block_type,
					coderInfo[channel].sfb_offset, coderInfo[channel].requantFreq);

				IFilterBank(hEncoder, &coderInfo[channel],
					coderInfo[channel].requantFreq,
					coderInfo[channel].ltpInfo.time_buffer,
					coderInfo[channel].ltpInfo.ltp_overlap_buffer,
					MOVERLAPPED);

				LtpUpdate(&(coderInfo[channel].ltpInfo),
					coderInfo[channel].ltpInfo.time_buffer,
					coderInfo[channel].ltpInfo.ltp_overlap_buffer,
					BLOCK_LEN_LONG);
			}
		}
	}
	/*写入AAC比特流   */
	bitStream = OpenBitStream(bufferSize, outputBuffer);
	WriteBitstream(hEncoder, coderInfo, channelInfo, bitStream, numChannels);
	/*关闭比特流，并返回实际写入的字节数目*/
	frameBytes = CloseBitStream(bitStream);

#ifdef _DEBUG
	printf("%4d %4d\n", hEncoder->frameNum-1, frameBytes);
#endif
	return frameBytes;
}



/* Scalefactorband data table */
static SR_INFO srInfo[12+1] =
{
	{ 96000, 41, 12,
		{
			4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 
			8, 8, 8, 8, 8, 12, 12, 12, 12, 12, 16, 16, 24, 28, 
			36, 44, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64
		},{
			4, 4, 4, 4, 4, 4, 8, 8, 8, 16, 28, 36
		}
	}, { 88200, 41, 12,
		{
			4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 
			8, 8, 8, 8, 8, 12, 12, 12, 12, 12, 16, 16, 24, 28, 
			36, 44, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64
		},{
			4, 4, 4, 4, 4, 4, 8, 8, 8, 16, 28, 36
		}
	}, { 64000, 47, 12,
		{
			4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
			8, 8, 8, 8, 12, 12, 12, 16, 16, 16, 20, 24, 24, 28,
			36, 40, 40, 40, 40, 40, 40, 40, 40, 40, 40, 40, 40, 40,
			40, 40, 40, 40, 40
		},{
			4, 4, 4, 4, 4, 4, 8, 8, 8, 16, 28, 32
		}
	}, { 48000, 49, 14,
		{
			4,  4,  4,  4,  4,  4,  4,  4,  4,  4,  8,  8,  8,  8,  8,  8,  8, 
			12, 12, 12, 12, 16, 16, 20, 20, 24, 24, 28, 28, 32, 32, 32, 32, 32, 32,
			32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 96
		}, {
			4,  4,  4,  4,  4,  8,  8,  8, 12, 12, 12, 16, 16, 16 
		}
	}, { 44100, 49, 14,
		{
			4,  4,  4,  4,  4,  4,  4,  4,  4,  4,  8,  8,  8,  8,  8,  8,  8, 
			12, 12, 12, 12, 16, 16, 20, 20, 24, 24, 28, 28, 32, 32, 32, 32, 32, 32,
			32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 96
		}, {
			4,  4,  4,  4,  4,  8,  8,  8, 12, 12, 12, 16, 16, 16 
		}
	}, { 32000, 51, 14,
		{
			4,	4,	4,	4,	4,	4,	4,	4,	4,	4,	8,	8,	8,	8,	
			8,	8,	8,	12,	12,	12,	12,	16,	16,	20,	20,	24,	24,	28,	
			28,	32,	32,	32,	32,	32,	32,	32,	32,	32,	32,	32,	32,	32,
			32,	32,	32,	32,	32,	32,	32,	32,	32
		},{
			4,	4,	4,	4,	4,	8,	8,	8,	12,	12,	12,	16,	16,	16
		}
	}, { 24000, 47, 15,
		{
			4,  4,  4,  4,  4,  4,  4,  4,  4,  4,  4,  8,  8,  8,  8,  8,  8,  8,
			8,  8,  8,  12, 12, 12, 12, 16, 16, 16, 20, 20, 24, 24, 28, 28, 32,
			36, 36, 40, 44, 48, 52, 52, 64, 64, 64, 64, 64
		}, {
			4,  4,  4,  4,  4,  4,  4,  8,  8,  8, 12, 12, 16, 16, 20
		}
	}, { 22050, 47, 15,
		{
			4,  4,  4,  4,  4,  4,  4,  4,  4,  4,  4,  8,  8,  8,  8,  8,  8,  8,
			8,  8,  8,  12, 12, 12, 12, 16, 16, 16, 20, 20, 24, 24, 28, 28, 32,
			36, 36, 40, 44, 48, 52, 52, 64, 64, 64, 64, 64
		}, {
			4,  4,  4,  4,  4,  4,  4,  8,  8,  8, 12, 12, 16, 16, 20
		}
	}, { 16000, 43, 15,
		{
			8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 12, 12, 12, 
			12, 12, 12, 12, 12, 12, 16, 16, 16, 16, 20, 20, 20, 24, 
			24, 28, 28, 32, 36, 40, 40, 44, 48, 52, 56, 60, 64, 64, 64
		}, {
			4, 4, 4, 4, 4, 4, 4, 4, 8, 8, 12, 12, 16, 20, 20
		}
	}, { 12000, 43, 15,
		{
			8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 12, 12, 12, 
			12, 12, 12, 12, 12, 12, 16, 16, 16, 16, 20, 20, 20, 24, 
			24, 28, 28, 32, 36, 40, 40, 44, 48, 52, 56, 60, 64, 64, 64
		}, {
			4, 4, 4, 4, 4, 4, 4, 4, 8, 8, 12, 12, 16, 20, 20
		}
	}, { 11025, 43, 15,
		{
			8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 12, 12, 12, 
			12, 12, 12, 12, 12, 12, 16, 16, 16, 16, 20, 20, 20, 24,
			24, 28, 28, 32, 36, 40, 40, 44, 48, 52, 56, 60, 64, 64, 64
		}, {
			4, 4, 4, 4, 4, 4, 4, 4, 8, 8, 12, 12, 16, 20, 20
		}
	}, { 8000, 40, 15,
		{
			12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 16, 
			16, 16, 16, 16, 16, 16, 20, 20, 20, 20, 24, 24, 24, 28, 
			28, 32, 36, 36, 40, 44, 48, 52, 56, 60, 64, 80
		}, {
			4, 4, 4, 4, 4, 4, 4, 8, 8, 8, 8, 12, 16, 20, 20
		}
	},
	{ -1 }
};