isdn/mISDN/dsp_audio.c

105 static unsigned char linear2ulaw(short sample)
127 	/* Get the sample into sign-magnitude. */
128 	sign = (sample >> 8) & 0x80;	  /* set aside the sign */
130 		sample = -sample;	      /* get magnitude */
133 	sample = sample + BIAS;
134 	exponent = exp_lut[(sample >> 7) & 0xFF];
135 	mantissa = (sample >> (exponent + 3)) & 0x0F;
180  * the seven bit sample is the number of every second alaw-sample ordered by
187  * generate table for conversion law from/to 7-bit alaw-like sample *
210 		/* spl is the source: the law-sample (converted to alaw) */
214 		/* find the 7-bit-sample */
242 	s32 sample;
248 			sample = dsp_audio_law_to_s32[i];
249 			sample += dsp_audio_law_to_s32[j];
250 			if (sample > 32767)
251 				sample = 32767;
252 			if (sample < -32768)
253 				sample = -32768;
255 				dsp_audio_s16_to_law[sample & 0xffff];
306 	register s32 sample;
329 		sample = dsp_audio_law_to_s32[i] * num[0] / denum[0];
330 		if (sample < -32768)
331 			sample = -32768;
332 		else if (sample > 32767)
333 			sample = 32767;
334 		dsp_audio_increase1[i] = dsp_audio_s16_to_law[sample & 0xffff];
335 		sample = dsp_audio_law_to_s32[i] * num[1] / denum[1];
336 		if (sample < -32768)
337 			sample = -32768;
338 		else if (sample > 32767)
339 			sample = 32767;
340 		dsp_audio_increase2[i] = dsp_audio_s16_to_law[sample & 0xffff];
341 		sample = dsp_audio_law_to_s32[i] * num[2] / denum[2];
342 		if (sample < -32768)
343 			sample = -32768;
344 		else if (sample > 32767)
345 			sample = 32767;
346 		dsp_audio_increase3[i] = dsp_audio_s16_to_law[sample & 0xffff];
347 		sample = dsp_audio_law_to_s32[i] * num[3] / denum[3];
348 		if (sample < -32768)
349 			sample = -32768;
350 		else if (sample > 32767)
351 			sample = 32767;
352 		dsp_audio_increase4[i] = dsp_audio_s16_to_law[sample & 0xffff];
353 		sample = dsp_audio_law_to_s32[i] * num[4] / denum[4];
354 		if (sample < -32768)
355 			sample = -32768;
356 		else if (sample > 32767)
357 			sample = 32767;
358 		dsp_audio_increase5[i] = dsp_audio_s16_to_law[sample & 0xffff];
359 		sample = dsp_audio_law_to_s32[i] * num[5] / denum[5];
360 		if (sample < -32768)
361 			sample = -32768;
362 		else if (sample > 32767)
363 			sample = 32767;
364 		dsp_audio_increase6[i] = dsp_audio_s16_to_law[sample & 0xffff];
365 		sample = dsp_audio_law_to_s32[i] * num[6] / denum[6];
366 		if (sample < -32768)
367 			sample = -32768;
368 		else if (sample > 32767)
369 			sample = 32767;
370 		dsp_audio_increase7[i] = dsp_audio_s16_to_law[sample & 0xffff];
371 		sample = dsp_audio_law_to_s32[i] * num[7] / denum[7];
372 		if (sample < -32768)
373 			sample = -32768;
374 		else if (sample > 32767)
375 			sample = 32767;
376 		dsp_audio_increase8[i] = dsp_audio_s16_to_law[sample & 0xffff];