out_audio.c

linux环境下用纯c写的RTP协议的通用开发库

#include        "common.h"
#include        "decoder.h"
#include        "huffman.h"

#define THRESHHOLD 16000 /* samples */

void out_audio(audiodev, pcm_sample, num, fr_ps, psampFrames)
int audiodev;
short FAR pcm_sample[2][SSLIMIT][SBLIMIT];
int num;
frame_params *fr_ps;
unsigned long *psampFrames;
{
	int i,j,l;
	int stereo;
	int sblimit;
	static short int outsamp16[THRESHHOLD];
	static long k = 0;

	/*
	 * Check for flush signal (num < 0).
	 */
	if (num < 0) {
		k = 0;
		return;
	}

	stereo = fr_ps->stereo;
	sblimit = fr_ps->sblimit;

	for (i=0;i<num;i++) for (j=0;j<SBLIMIT;j++) {
		(*psampFrames)++;
		for (l=0;l<stereo;l++) {
			outsamp16[k++] = pcm_sample[l][i][j];

			if (k % THRESHHOLD == 0) {
				write(audiodev, outsamp16, k*2);
				k = 0;
			}
		}
	}
}