diff options
Diffstat (limited to 'sound/core/pcm_misc.c')
| -rw-r--r-- | sound/core/pcm_misc.c | 90 |
1 files changed, 78 insertions, 12 deletions
diff --git a/sound/core/pcm_misc.c b/sound/core/pcm_misc.c index 88f02e3866e..4560ca0e565 100644 --- a/sound/core/pcm_misc.c +++ b/sound/core/pcm_misc.c @@ -20,6 +20,7 @@ */ #include <linux/time.h> +#include <linux/export.h> #include <sound/core.h> #include <sound/pcm.h> #define SND_PCM_FORMAT_UNKNOWN (-1) @@ -139,6 +140,14 @@ static struct pcm_format_data pcm_formats[(INT)SNDRV_PCM_FORMAT_LAST+1] = { .width = 5, .phys = 5, .le = -1, .signd = -1, .silence = {}, }, + [SNDRV_PCM_FORMAT_DSD_U8] = { + .width = 8, .phys = 8, .le = 1, .signd = 0, + .silence = {}, + }, + [SNDRV_PCM_FORMAT_DSD_U16_LE] = { + .width = 16, .phys = 16, .le = 1, .signd = 0, + .silence = {}, + }, /* FIXME: the following three formats are not defined properly yet */ [SNDRV_PCM_FORMAT_MPEG] = { .le = -1, .signd = -1, @@ -212,7 +221,7 @@ static struct pcm_format_data pcm_formats[(INT)SNDRV_PCM_FORMAT_LAST+1] = { * snd_pcm_format_signed - Check the PCM format is signed linear * @format: the format to check * - * Returns 1 if the given PCM format is signed linear, 0 if unsigned + * Return: 1 if the given PCM format is signed linear, 0 if unsigned * linear, and a negative error code for non-linear formats. */ int snd_pcm_format_signed(snd_pcm_format_t format) @@ -231,7 +240,7 @@ EXPORT_SYMBOL(snd_pcm_format_signed); * snd_pcm_format_unsigned - Check the PCM format is unsigned linear * @format: the format to check * - * Returns 1 if the given PCM format is unsigned linear, 0 if signed + * Return: 1 if the given PCM format is unsigned linear, 0 if signed * linear, and a negative error code for non-linear formats. */ int snd_pcm_format_unsigned(snd_pcm_format_t format) @@ -250,7 +259,7 @@ EXPORT_SYMBOL(snd_pcm_format_unsigned); * snd_pcm_format_linear - Check the PCM format is linear * @format: the format to check * - * Returns 1 if the given PCM format is linear, 0 if not. + * Return: 1 if the given PCM format is linear, 0 if not. */ int snd_pcm_format_linear(snd_pcm_format_t format) { @@ -263,7 +272,7 @@ EXPORT_SYMBOL(snd_pcm_format_linear); * snd_pcm_format_little_endian - Check the PCM format is little-endian * @format: the format to check * - * Returns 1 if the given PCM format is little-endian, 0 if + * Return: 1 if the given PCM format is little-endian, 0 if * big-endian, or a negative error code if endian not specified. */ int snd_pcm_format_little_endian(snd_pcm_format_t format) @@ -282,7 +291,7 @@ EXPORT_SYMBOL(snd_pcm_format_little_endian); * snd_pcm_format_big_endian - Check the PCM format is big-endian * @format: the format to check * - * Returns 1 if the given PCM format is big-endian, 0 if + * Return: 1 if the given PCM format is big-endian, 0 if * little-endian, or a negative error code if endian not specified. */ int snd_pcm_format_big_endian(snd_pcm_format_t format) @@ -301,7 +310,7 @@ EXPORT_SYMBOL(snd_pcm_format_big_endian); * snd_pcm_format_width - return the bit-width of the format * @format: the format to check * - * Returns the bit-width of the format, or a negative error code + * Return: The bit-width of the format, or a negative error code * if unknown format. */ int snd_pcm_format_width(snd_pcm_format_t format) @@ -320,7 +329,7 @@ EXPORT_SYMBOL(snd_pcm_format_width); * snd_pcm_format_physical_width - return the physical bit-width of the format * @format: the format to check * - * Returns the physical bit-width of the format, or a negative error code + * Return: The physical bit-width of the format, or a negative error code * if unknown format. */ int snd_pcm_format_physical_width(snd_pcm_format_t format) @@ -340,7 +349,7 @@ EXPORT_SYMBOL(snd_pcm_format_physical_width); * @format: the format to check * @samples: sampling rate * - * Returns the byte size of the given samples for the format, or a + * Return: The byte size of the given samples for the format, or a * negative error code if unknown format. */ ssize_t snd_pcm_format_size(snd_pcm_format_t format, size_t samples) @@ -357,7 +366,7 @@ EXPORT_SYMBOL(snd_pcm_format_size); * snd_pcm_format_silence_64 - return the silent data in 8 bytes array * @format: the format to check * - * Returns the format pattern to fill or NULL if error. + * Return: The format pattern to fill or %NULL if error. */ const unsigned char *snd_pcm_format_silence_64(snd_pcm_format_t format) { @@ -378,7 +387,7 @@ EXPORT_SYMBOL(snd_pcm_format_silence_64); * * Sets the silence data on the buffer for the given samples. * - * Returns zero if successful, or a negative error code on failure. + * Return: Zero if successful, or a negative error code on failure. */ int snd_pcm_format_set_silence(snd_pcm_format_t format, void *data, unsigned int samples) { @@ -448,7 +457,7 @@ EXPORT_SYMBOL(snd_pcm_format_set_silence); * Determines the rate_min and rate_max fields from the rates bits of * the given runtime->hw. * - * Returns zero if successful. + * Return: Zero if successful. */ int snd_pcm_limit_hw_rates(struct snd_pcm_runtime *runtime) { @@ -474,7 +483,7 @@ EXPORT_SYMBOL(snd_pcm_limit_hw_rates); * snd_pcm_rate_to_rate_bit - converts sample rate to SNDRV_PCM_RATE_xxx bit * @rate: the sample rate to convert * - * Returns the SNDRV_PCM_RATE_xxx flag that corresponds to the given rate, or + * Return: The SNDRV_PCM_RATE_xxx flag that corresponds to the given rate, or * SNDRV_PCM_RATE_KNOT for an unknown rate. */ unsigned int snd_pcm_rate_to_rate_bit(unsigned int rate) @@ -487,3 +496,60 @@ unsigned int snd_pcm_rate_to_rate_bit(unsigned int rate) return SNDRV_PCM_RATE_KNOT; } EXPORT_SYMBOL(snd_pcm_rate_to_rate_bit); + +/** + * snd_pcm_rate_bit_to_rate - converts SNDRV_PCM_RATE_xxx bit to sample rate + * @rate_bit: the rate bit to convert + * + * Return: The sample rate that corresponds to the given SNDRV_PCM_RATE_xxx flag + * or 0 for an unknown rate bit. + */ +unsigned int snd_pcm_rate_bit_to_rate(unsigned int rate_bit) +{ + unsigned int i; + + for (i = 0; i < snd_pcm_known_rates.count; i++) + if ((1u << i) == rate_bit) + return snd_pcm_known_rates.list[i]; + return 0; +} +EXPORT_SYMBOL(snd_pcm_rate_bit_to_rate); + +static unsigned int snd_pcm_rate_mask_sanitize(unsigned int rates) +{ + if (rates & SNDRV_PCM_RATE_CONTINUOUS) + return SNDRV_PCM_RATE_CONTINUOUS; + else if (rates & SNDRV_PCM_RATE_KNOT) + return SNDRV_PCM_RATE_KNOT; + return rates; +} + +/** + * snd_pcm_rate_mask_intersect - computes the intersection between two rate masks + * @rates_a: The first rate mask + * @rates_b: The second rate mask + * + * This function computes the rates that are supported by both rate masks passed + * to the function. It will take care of the special handling of + * SNDRV_PCM_RATE_CONTINUOUS and SNDRV_PCM_RATE_KNOT. + * + * Return: A rate mask containing the rates that are supported by both rates_a + * and rates_b. + */ +unsigned int snd_pcm_rate_mask_intersect(unsigned int rates_a, + unsigned int rates_b) +{ + rates_a = snd_pcm_rate_mask_sanitize(rates_a); + rates_b = snd_pcm_rate_mask_sanitize(rates_b); + + if (rates_a & SNDRV_PCM_RATE_CONTINUOUS) + return rates_b; + else if (rates_b & SNDRV_PCM_RATE_CONTINUOUS) + return rates_a; + else if (rates_a & SNDRV_PCM_RATE_KNOT) + return rates_b; + else if (rates_b & SNDRV_PCM_RATE_KNOT) + return rates_a; + return rates_a & rates_b; +} +EXPORT_SYMBOL_GPL(snd_pcm_rate_mask_intersect); |