Improve granularity of format selection for S32/U32 formats by adding constants representing 20, 24 and 32 most significant bits.
To make it easy for drivers to utilize those constants, introduce snd_pcm_subformat_width() and params_bps(). While the former is self-explanatory, the latter returns the bit-per-sample value based on format, subformat and msbits characteristics of the provided hw_params.
Signed-off-by: Cezary Rojewski cezary.rojewski@intel.com --- include/sound/pcm.h | 8 ++++++++ include/sound/pcm_params.h | 2 ++ include/uapi/sound/asound.h | 5 ++++- sound/core/pcm_lib.c | 30 ++++++++++++++++++++++++++++++ sound/core/pcm_misc.c | 23 +++++++++++++++++++++++ tools/include/uapi/sound/asound.h | 5 ++++- 6 files changed, 71 insertions(+), 2 deletions(-)
diff --git a/include/sound/pcm.h b/include/sound/pcm.h index 19f564606ac4..f78441ff9d85 100644 --- a/include/sound/pcm.h +++ b/include/sound/pcm.h @@ -31,6 +31,7 @@ struct snd_pcm_hardware { unsigned int info; /* SNDRV_PCM_INFO_* */ u64 formats; /* SNDRV_PCM_FMTBIT_* */ + u64 subformats; /* SNDRV_PCM_SUBFMTBIT_* */ unsigned int rates; /* SNDRV_PCM_RATE_* */ unsigned int rate_min; /* min rate */ unsigned int rate_max; /* max rate */ @@ -219,6 +220,12 @@ struct snd_pcm_ops { #define SNDRV_PCM_FMTBIT_U20 SNDRV_PCM_FMTBIT_U20_BE #endif
+#define _SNDRV_PCM_SUBFMTBIT(fmt) BIT((__force int)SNDRV_PCM_SUBFORMAT_##fmt) +#define SNDRV_PCM_SUBFMTBIT_STD _SNDRV_PCM_SUBFMTBIT(STD) +#define SNDRV_PCM_SUBFMTBIT_MSBITS_20 _SNDRV_PCM_SUBFMTBIT(MSBITS_20) +#define SNDRV_PCM_SUBFMTBIT_MSBITS_24 _SNDRV_PCM_SUBFMTBIT(MSBITS_24) +#define SNDRV_PCM_SUBFMTBIT_MSBITS_32 _SNDRV_PCM_SUBFMTBIT(MSBITS_32) + struct snd_pcm_file { struct snd_pcm_substream *substream; int no_compat_mmap; @@ -1130,6 +1137,7 @@ int snd_pcm_format_physical_width(snd_pcm_format_t format); /* in bits */ ssize_t snd_pcm_format_size(snd_pcm_format_t format, size_t samples); const unsigned char *snd_pcm_format_silence_64(snd_pcm_format_t format); int snd_pcm_format_set_silence(snd_pcm_format_t format, void *buf, unsigned int frames); +int snd_pcm_subformat_width(snd_pcm_subformat_t subformat);
void snd_pcm_set_ops(struct snd_pcm * pcm, int direction, const struct snd_pcm_ops *ops); diff --git a/include/sound/pcm_params.h b/include/sound/pcm_params.h index ba184f49f7e1..f09ae37ed44d 100644 --- a/include/sound/pcm_params.h +++ b/include/sound/pcm_params.h @@ -362,6 +362,8 @@ static inline int params_physical_width(const struct snd_pcm_hw_params *p) return snd_pcm_format_physical_width(params_format(p)); }
+int params_bps(const struct snd_pcm_hw_params *p); + static inline void params_set_format(struct snd_pcm_hw_params *p, snd_pcm_format_t fmt) { diff --git a/include/uapi/sound/asound.h b/include/uapi/sound/asound.h index d6864f672630..27db9f3558fd 100644 --- a/include/uapi/sound/asound.h +++ b/include/uapi/sound/asound.h @@ -268,7 +268,10 @@ typedef int __bitwise snd_pcm_format_t;
typedef int __bitwise snd_pcm_subformat_t; #define SNDRV_PCM_SUBFORMAT_STD ((__force snd_pcm_subformat_t) 0) -#define SNDRV_PCM_SUBFORMAT_LAST SNDRV_PCM_SUBFORMAT_STD +#define SNDRV_PCM_SUBFORMAT_MSBITS_20 ((__force snd_pcm_subformat_t) 1) +#define SNDRV_PCM_SUBFORMAT_MSBITS_24 ((__force snd_pcm_subformat_t) 2) +#define SNDRV_PCM_SUBFORMAT_MSBITS_32 ((__force snd_pcm_subformat_t) 3) +#define SNDRV_PCM_SUBFORMAT_LAST SNDRV_PCM_SUBFORMAT_MSBITS_32
#define SNDRV_PCM_INFO_MMAP 0x00000001 /* hardware supports mmap */ #define SNDRV_PCM_INFO_MMAP_VALID 0x00000002 /* period data are valid during transfer */ diff --git a/sound/core/pcm_lib.c b/sound/core/pcm_lib.c index 9c121a921b04..4a60632220c2 100644 --- a/sound/core/pcm_lib.c +++ b/sound/core/pcm_lib.c @@ -1706,6 +1706,36 @@ int snd_pcm_hw_param_last(struct snd_pcm_substream *pcm, } EXPORT_SYMBOL(snd_pcm_hw_param_last);
+/** + * params_bps - Get the number of bits per the sample. + * @p: hardware parameters + * + * Return: The number of bits per sample based on the format, + * subformat and msbits the specified hw params has. + */ +int params_bps(const struct snd_pcm_hw_params *p) +{ + snd_pcm_subformat_t subformat = params_subformat(p); + snd_pcm_format_t format = params_format(p); + int width; + + switch (format) { + case SNDRV_PCM_FORMAT_S32_LE: + case SNDRV_PCM_FORMAT_U32_LE: + case SNDRV_PCM_FORMAT_S32_BE: + case SNDRV_PCM_FORMAT_U32_BE: + width = snd_pcm_subformat_width(subformat); + if (width) + return width; + if (p->msbits) + return (int)p->msbits; + fallthrough; + default: + return snd_pcm_format_width(format); + } +} +EXPORT_SYMBOL(params_bps); + static int snd_pcm_lib_ioctl_reset(struct snd_pcm_substream *substream, void *arg) { diff --git a/sound/core/pcm_misc.c b/sound/core/pcm_misc.c index 5588b6a1ee8b..127bb36fd2e4 100644 --- a/sound/core/pcm_misc.c +++ b/sound/core/pcm_misc.c @@ -482,6 +482,29 @@ int snd_pcm_format_set_silence(snd_pcm_format_t format, void *data, unsigned int } EXPORT_SYMBOL(snd_pcm_format_set_silence);
+/** + * snd_pcm_subformat_width - return the bit-width of the subformat + * @subformat: the subformat to check + * + * Return: The bit-width of the subformat, or a negative error code + * otherwise. + */ +int snd_pcm_subformat_width(snd_pcm_subformat_t subformat) +{ + switch (subformat) { + case SNDRV_PCM_SUBFORMAT_MSBITS_20: + return 20; + case SNDRV_PCM_SUBFORMAT_MSBITS_24: + return 24; + case SNDRV_PCM_SUBFORMAT_MSBITS_32: + return 32; + case SNDRV_PCM_SUBFORMAT_STD: + default: + return 0; + } +} +EXPORT_SYMBOL(snd_pcm_subformat_width); + /** * snd_pcm_hw_limit_rates - determine rate_min/rate_max fields * @hw: the pcm hw instance diff --git a/tools/include/uapi/sound/asound.h b/tools/include/uapi/sound/asound.h index 0aa955aa8246..eb45a698767f 100644 --- a/tools/include/uapi/sound/asound.h +++ b/tools/include/uapi/sound/asound.h @@ -267,7 +267,10 @@ typedef int __bitwise snd_pcm_format_t;
typedef int __bitwise snd_pcm_subformat_t; #define SNDRV_PCM_SUBFORMAT_STD ((__force snd_pcm_subformat_t) 0) -#define SNDRV_PCM_SUBFORMAT_LAST SNDRV_PCM_SUBFORMAT_STD +#define SNDRV_PCM_SUBFORMAT_MSBITS_20 ((__force snd_pcm_subformat_t) 1) +#define SNDRV_PCM_SUBFORMAT_MSBITS_24 ((__force snd_pcm_subformat_t) 2) +#define SNDRV_PCM_SUBFORMAT_MSBITS_32 ((__force snd_pcm_subformat_t) 3) +#define SNDRV_PCM_SUBFORMAT_LAST SNDRV_PCM_SUBFORMAT_MSBITS_32
#define SNDRV_PCM_INFO_MMAP 0x00000001 /* hardware supports mmap */ #define SNDRV_PCM_INFO_MMAP_VALID 0x00000002 /* period data are valid during transfer */