20 /* ulaw[unsigned char] -> signed 16-bit */
21 s32 dsp_audio_ulaw_to_s32[256];
22 /* alaw[unsigned char] -> signed 16-bit */
23 s32 dsp_audio_alaw_to_s32[256];
28 /* signed 16-bit -> law */
32 /* alaw -> ulaw */
33 u8 dsp_audio_alaw_to_ulaw[256];
34 /* ulaw -> alaw */
35 static u8 dsp_audio_ulaw_to_alaw[256];
61 		pcm_val = -pcm_val;  in linear2alaw()
84 		i = (i + 0x100) << (seg - 1);  in alaw2linear()
85 	return (short int) ((alaw & 0x80)  ?  i  :  -i);  in alaw2linear()
93 	mu = 255 - ulaw;  in ulaw2linear()
99 		y = -y;  in ulaw2linear()
103 #define BIAS 0x84   /*!< define the add-in bias for 16 bit samples */
107 	static int exp_lut[256] = {  in linear2ulaw()
127 	/* Get the sample into sign-magnitude. */  in linear2ulaw()
130 		sample = -sample;	      /* get magnitude */  in linear2ulaw()
144 	for (i = 0; i < 256; i++)  in dsp_audio_generate_law_tables()
147 	for (i = 0; i < 256; i++)  in dsp_audio_generate_law_tables()
150 	for (i = 0; i < 256; i++) {  in dsp_audio_generate_law_tables()
164 		/* generating ulaw-table */  in dsp_audio_generate_s2law_table()
165 		for (i = -32768; i < 32768; i++) {  in dsp_audio_generate_s2law_table()
170 		/* generating alaw-table */  in dsp_audio_generate_s2law_table()
171 		for (i = -32768; i < 32768; i++) {  in dsp_audio_generate_s2law_table()
180  * the seven bit sample is the number of every second alaw-sample ordered by
184 u8 dsp_audio_law2seven[256];
187  * generate table for conversion law from/to 7-bit alaw-like sample *
195 	u8 sorted_alaw[256];  in dsp_audio_generate_seven()
198 	for (i = 0; i < 256; i++) {  in dsp_audio_generate_seven()
200 		for (k = 0; k < 256; k++) {  in dsp_audio_generate_seven()
209 	for (i = 0; i < 256; i++) {  in dsp_audio_generate_seven()
210 		/* spl is the source: the law-sample (converted to alaw) */  in dsp_audio_generate_seven()
214 		/* find the 7-bit-sample */  in dsp_audio_generate_seven()
215 		for (j = 0; j < 256; j++) {  in dsp_audio_generate_seven()
219 		/* write 7-bit audio value */  in dsp_audio_generate_seven()
231 /* mix 2*law -> law */
245 	while (i < 256) {  in dsp_audio_generate_mix_table()
247 		while (j < 256) {  in dsp_audio_generate_mix_table()
252 			if (sample < -32768)  in dsp_audio_generate_mix_table()
253 				sample = -32768;  in dsp_audio_generate_mix_table()
267 static u8 dsp_audio_reduce8[256];
268 static u8 dsp_audio_reduce7[256];
269 static u8 dsp_audio_reduce6[256];
270 static u8 dsp_audio_reduce5[256];
271 static u8 dsp_audio_reduce4[256];
272 static u8 dsp_audio_reduce3[256];
273 static u8 dsp_audio_reduce2[256];
274 static u8 dsp_audio_reduce1[256];
275 static u8 dsp_audio_increase1[256];
276 static u8 dsp_audio_increase2[256];
277 static u8 dsp_audio_increase3[256];
278 static u8 dsp_audio_increase4[256];
279 static u8 dsp_audio_increase5[256];
280 static u8 dsp_audio_increase6[256];
281 static u8 dsp_audio_increase7[256];
282 static u8 dsp_audio_increase8[256];
312 	while (i < 256) {  in dsp_audio_generate_volume_changes()
330 		if (sample < -32768)  in dsp_audio_generate_volume_changes()
331 			sample = -32768;  in dsp_audio_generate_volume_changes()
336 		if (sample < -32768)  in dsp_audio_generate_volume_changes()
337 			sample = -32768;  in dsp_audio_generate_volume_changes()
342 		if (sample < -32768)  in dsp_audio_generate_volume_changes()
343 			sample = -32768;  in dsp_audio_generate_volume_changes()
348 		if (sample < -32768)  in dsp_audio_generate_volume_changes()
349 			sample = -32768;  in dsp_audio_generate_volume_changes()
354 		if (sample < -32768)  in dsp_audio_generate_volume_changes()
355 			sample = -32768;  in dsp_audio_generate_volume_changes()
360 		if (sample < -32768)  in dsp_audio_generate_volume_changes()
361 			sample = -32768;  in dsp_audio_generate_volume_changes()
366 		if (sample < -32768)  in dsp_audio_generate_volume_changes()
367 			sample = -32768;  in dsp_audio_generate_volume_changes()
372 		if (sample < -32768)  in dsp_audio_generate_volume_changes()
373 			sample = -32768;  in dsp_audio_generate_volume_changes()
388  * -8 to 8, which is a shift to the power of 2. 0 == no volume, 3 == volume*8
395 	u8 *p;  in dsp_change_volume()  local
413 	ii = skb->len;  in dsp_change_volume()
414 	p = skb->data;  in dsp_change_volume()
417 		*p = volume_change[*p];  in dsp_change_volume()
418 		p++;  in dsp_change_volume()