2  *  PCM Interface - misc routines
18  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
29 #define SND_PCM_FORMAT_UNKNOWN (-1)
37 	signed char le;	/* 0 = big-endian, 1 = little-endian, -1 = others */
38 	signed char signd;	/* 0 = unsigned, 1 = signed, -1 = others */
42 /* we do lots of calculations on snd_pcm_format_t; shut up sparse */
52 		.width = 8, .phys = 8, .le = -1, .signd = 1,
56 		.width = 8, .phys = 8, .le = -1, .signd = 0,
108 		.width = 32, .phys = 32, .le = 1, .signd = -1,
112 		.width = 32, .phys = 32, .le = 0, .signd = -1,
116 		.width = 64, .phys = 64, .le = 1, .signd = -1,
120 		.width = 64, .phys = 64, .le = 0, .signd = -1,
124 		.width = 32, .phys = 32, .le = 1, .signd = -1,
128 		.width = 32, .phys = 32, .le = 0, .signd = -1,
132 		.width = 8, .phys = 8, .le = -1, .signd = -1,
136 		.width = 8, .phys = 8, .le = -1, .signd = -1,
140 		.width = 4, .phys = 4, .le = -1, .signd = -1,
144 		.width = 3, .phys = 3, .le = -1, .signd = -1,
148 		.width = 5, .phys = 5, .le = -1, .signd = -1,
173 		.le = -1, .signd = -1,
176 		.le = -1, .signd = -1,
196 		.le = -1, .signd = -1,
247 		.width = 3, .phys = 8, .le = -1, .signd = -1,
251 		.width = 5, .phys = 8, .le = -1, .signd = -1,
258  * snd_pcm_format_signed - Check the PCM format is signed linear
262  * linear, and a negative error code for non-linear formats.
268 		return -EINVAL;  in snd_pcm_format_signed()
270 		return -EINVAL;  in snd_pcm_format_signed()
276  * snd_pcm_format_unsigned - Check the PCM format is unsigned linear
280  * linear, and a negative error code for non-linear formats.
294  * snd_pcm_format_linear - Check the PCM format is linear
306  * snd_pcm_format_little_endian - Check the PCM format is little-endian
309  * Return: 1 if the given PCM format is little-endian, 0 if
310  * big-endian, or a negative error code if endian not specified.
316 		return -EINVAL;  in snd_pcm_format_little_endian()
318 		return -EINVAL;  in snd_pcm_format_little_endian()
324  * snd_pcm_format_big_endian - Check the PCM format is big-endian
327  * Return: 1 if the given PCM format is big-endian, 0 if
328  * little-endian, or a negative error code if endian not specified.
342  * snd_pcm_format_width - return the bit-width of the format
345  * Return: The bit-width of the format, or a negative error code
352 		return -EINVAL;  in snd_pcm_format_width()
354 		return -EINVAL;  in snd_pcm_format_width()
360  * snd_pcm_format_physical_width - return the physical bit-width of the format
363  * Return: The physical bit-width of the format, or a negative error code
370 		return -EINVAL;  in snd_pcm_format_physical_width()
372 		return -EINVAL;  in snd_pcm_format_physical_width()
378  * snd_pcm_format_size - return the byte size of samples on the given format
380  * @samples: sampling rate
382  * Return: The byte size of the given samples for the format, or a
385 ssize_t snd_pcm_format_size(snd_pcm_format_t format, size_t samples)  in snd_pcm_format_size()  argument
389 		return -EINVAL;  in snd_pcm_format_size()
390 	return samples * phys_width / 8;  in snd_pcm_format_size()
395  * snd_pcm_format_silence_64 - return the silent data in 8 bytes array
411  * snd_pcm_format_set_silence - set the silence data on the buffer
414  * @samples: the number of samples to set silence
416  * Sets the silence data on the buffer for the given samples.
420 int snd_pcm_format_set_silence(snd_pcm_format_t format, void *data, unsigned int samples)  in snd_pcm_format_set_silence()  argument
427 		return -EINVAL;  in snd_pcm_format_set_silence()
428 	if (samples == 0)  in snd_pcm_format_set_silence()
433 		return -EINVAL;  in snd_pcm_format_set_silence()
436 		unsigned int bytes = samples * width / 8;  in snd_pcm_format_set_silence()
440 	/* non-zero samples, fill using a loop */  in snd_pcm_format_set_silence()
444 	while (samples--) {  in snd_pcm_format_set_silence()
452 		while (samples--) {  in snd_pcm_format_set_silence()
458 		while (samples--) {  in snd_pcm_format_set_silence()
464 		while (samples--) {  in snd_pcm_format_set_silence()
470 		while (samples--) {  in snd_pcm_format_set_silence()
482  * snd_pcm_hw_limit_rates - determine rate_min/rate_max fields
494 		if (hw->rates & (1 << i)) {  in snd_pcm_hw_limit_rates()
495 			hw->rate_min = snd_pcm_known_rates.list[i];  in snd_pcm_hw_limit_rates()
499 	for (i = (int)snd_pcm_known_rates.count - 1; i >= 0; i--) {  in snd_pcm_hw_limit_rates()
500 		if (hw->rates & (1 << i)) {  in snd_pcm_hw_limit_rates()
501 			hw->rate_max = snd_pcm_known_rates.list[i];  in snd_pcm_hw_limit_rates()
510  * snd_pcm_rate_to_rate_bit - converts sample rate to SNDRV_PCM_RATE_xxx bit
528  * snd_pcm_rate_bit_to_rate - converts SNDRV_PCM_RATE_xxx bit to sample rate
555  * snd_pcm_rate_mask_intersect - computes the intersection between two rate masks
585  * snd_pcm_rate_range_to_bits - converts rate range to SNDRV_PCM_RATE_xxx bit
590  * only the pre-defined rates like 44100 or 16000.