mirror of
https://github.com/alsa-project/alsa-lib.git
synced 2025-10-29 05:40:25 -04:00
342 lines
18 KiB
C
342 lines
18 KiB
C
/****************************************************************************
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* *
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* pcm.h *
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* Digital Audio Interface *
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* *
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****************************************************************************/
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typedef struct _snd_pcm_info snd_pcm_info_t;
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typedef struct _snd_pcm_hw_params snd_pcm_hw_params_t;
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typedef struct _snd_pcm_sw_params snd_pcm_sw_params_t;
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typedef struct _snd_pcm_status snd_pcm_status_t;
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typedef struct _snd_pcm_access_mask snd_pcm_access_mask_t;
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typedef struct _snd_pcm_format_mask snd_pcm_format_mask_t;
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typedef struct _snd_pcm_subformat_mask snd_pcm_subformat_mask_t;
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#ifdef SND_ENUM_TYPECHECK
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typedef struct __snd_pcm_class *snd_pcm_class_t;
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typedef struct __snd_pcm_subclass *snd_pcm_subclass_t;
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typedef struct __snd_pcm_stream *snd_pcm_stream_t;
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typedef struct __snd_pcm_access *snd_pcm_access_t;
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typedef struct __snd_pcm_format *snd_pcm_format_t;
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typedef struct __snd_pcm_subformat *snd_pcm_subformat_t;
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typedef struct __snd_pcm_state *snd_pcm_state_t;
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typedef struct __snd_pcm_start *snd_pcm_start_t;
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typedef struct __snd_pcm_xrun *snd_pcm_xrun_t;
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typedef struct __snd_pcm_tstamp *snd_pcm_tstamp_t;
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#else
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typedef enum sndrv_pcm_class snd_pcm_class_t;
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typedef enum sndrv_pcm_subclass snd_pcm_subclass_t;
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typedef enum sndrv_pcm_stream snd_pcm_stream_t;
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typedef enum sndrv_pcm_access snd_pcm_access_t;
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typedef enum sndrv_pcm_format snd_pcm_format_t;
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typedef enum sndrv_pcm_subformat snd_pcm_subformat_t;
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typedef enum sndrv_pcm_state snd_pcm_state_t;
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typedef enum sndrv_pcm_start snd_pcm_start_t;
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typedef enum sndrv_pcm_xrun snd_pcm_xrun_t;
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typedef enum sndrv_pcm_tstamp snd_pcm_tstamp_t;
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#endif
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#define SND_PCM_CLASS_GENERIC ((snd_pcm_class_t) SNDRV_PCM_CLASS_GENERIC)
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#define SND_PCM_CLASS_MULTI ((snd_pcm_class_t) SNDRV_PCM_CLASS_MULTI)
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#define SND_PCM_CLASS_MODEM ((snd_pcm_class_t) SNDRV_PCM_CLASS_MODEM)
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#define SND_PCM_CLASS_DIGITIZER ((snd_pcm_class_t) SNDRV_PCM_CLASS_DIGITIZER)
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#define SND_PCM_SUBCLASS_GENERIC_MIX ((snd_pcm_subclass_t) SNDRV_PCM_SUBCLASS_GENERIC_MIX)
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#define SND_PCM_SUBCLASS_MULTI_MIX ((snd_pcm_subclass_t) SNDRV_PCM_SUBCLASS_MULTI_MIX)
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#define SND_PCM_STREAM_PLAYBACK ((snd_pcm_stream_t) SNDRV_PCM_STREAM_PLAYBACK)
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#define SND_PCM_STREAM_CAPTURE ((snd_pcm_stream_t) SNDRV_PCM_STREAM_CAPTURE)
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#define SND_PCM_STREAM_LAST ((snd_pcm_stream_t) SNDRV_PCM_STREAM_LAST)
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#define SND_PCM_ACCESS_MMAP_INTERLEAVED ((snd_pcm_access_t) SNDRV_PCM_ACCESS_MMAP_INTERLEAVED)
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#define SND_PCM_ACCESS_MMAP_NONINTERLEAVED ((snd_pcm_access_t) SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED)
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#define SND_PCM_ACCESS_MMAP_COMPLEX ((snd_pcm_access_t) SNDRV_PCM_ACCESS_MMAP_COMPLEX)
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#define SND_PCM_ACCESS_RW_INTERLEAVED ((snd_pcm_access_t) SNDRV_PCM_ACCESS_RW_INTERLEAVED)
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#define SND_PCM_ACCESS_RW_NONINTERLEAVED ((snd_pcm_access_t) SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
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#define SND_PCM_ACCESS_LAST ((snd_pcm_access_t) SNDRV_PCM_ACCESS_LAST)
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#define SND_PCM_FORMAT_UNKNOWN ((snd_pcm_format_t) -1)
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#define SND_PCM_FORMAT_S8 ((snd_pcm_format_t) SNDRV_PCM_FORMAT_S8)
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#define SND_PCM_FORMAT_U8 ((snd_pcm_format_t) SNDRV_PCM_FORMAT_U8)
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#define SND_PCM_FORMAT_S16_LE ((snd_pcm_format_t) SNDRV_PCM_FORMAT_S16_LE)
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#define SND_PCM_FORMAT_S16_BE ((snd_pcm_format_t) SNDRV_PCM_FORMAT_S16_BE)
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#define SND_PCM_FORMAT_U16_LE ((snd_pcm_format_t) SNDRV_PCM_FORMAT_U16_LE)
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#define SND_PCM_FORMAT_U16_BE ((snd_pcm_format_t) SNDRV_PCM_FORMAT_U16_BE)
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#define SND_PCM_FORMAT_S24_LE ((snd_pcm_format_t) SNDRV_PCM_FORMAT_S24_LE)
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#define SND_PCM_FORMAT_S24_BE ((snd_pcm_format_t) SNDRV_PCM_FORMAT_S24_BE)
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#define SND_PCM_FORMAT_U24_LE ((snd_pcm_format_t) SNDRV_PCM_FORMAT_U24_LE)
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#define SND_PCM_FORMAT_U24_BE ((snd_pcm_format_t) SNDRV_PCM_FORMAT_U24_BE)
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#define SND_PCM_FORMAT_S32_LE ((snd_pcm_format_t) SNDRV_PCM_FORMAT_S32_LE)
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#define SND_PCM_FORMAT_S32_BE ((snd_pcm_format_t) SNDRV_PCM_FORMAT_S32_BE)
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#define SND_PCM_FORMAT_U32_LE ((snd_pcm_format_t) SNDRV_PCM_FORMAT_U32_LE)
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#define SND_PCM_FORMAT_U32_BE ((snd_pcm_format_t) SNDRV_PCM_FORMAT_U32_BE)
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#define SND_PCM_FORMAT_FLOAT_LE ((snd_pcm_format_t) SNDRV_PCM_FORMAT_FLOAT_LE)
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#define SND_PCM_FORMAT_FLOAT_BE ((snd_pcm_format_t) SNDRV_PCM_FORMAT_FLOAT_BE)
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#define SND_PCM_FORMAT_FLOAT64_LE ((snd_pcm_format_t) SNDRV_PCM_FORMAT_FLOAT64_LE)
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#define SND_PCM_FORMAT_FLOAT64_BE ((snd_pcm_format_t) SNDRV_PCM_FORMAT_FLOAT64_BE)
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#define SND_PCM_FORMAT_IEC958_SUBFRAME_LE ((snd_pcm_format_t) SNDRV_PCM_FORMAT_IEC958_SUBFRAME_LE)
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#define SND_PCM_FORMAT_IEC958_SUBFRAME_BE ((snd_pcm_format_t) SNDRV_PCM_FORMAT_IEC958_SUBFRAME_BE)
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#define SND_PCM_FORMAT_MU_LAW ((snd_pcm_format_t) SNDRV_PCM_FORMAT_MU_LAW)
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#define SND_PCM_FORMAT_A_LAW ((snd_pcm_format_t) SNDRV_PCM_FORMAT_A_LAW)
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#define SND_PCM_FORMAT_IMA_ADPCM ((snd_pcm_format_t) SNDRV_PCM_FORMAT_IMA_ADPCM)
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#define SND_PCM_FORMAT_MPEG ((snd_pcm_format_t) SNDRV_PCM_FORMAT_MPEG)
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#define SND_PCM_FORMAT_GSM ((snd_pcm_format_t) SNDRV_PCM_FORMAT_GSM)
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#define SND_PCM_FORMAT_SPECIAL ((snd_pcm_format_t) SNDRV_PCM_FORMAT_SPECIAL)
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#define SND_PCM_FORMAT_LAST ((snd_pcm_format_t) SNDRV_PCM_FORMAT_LAST)
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#define SND_PCM_FORMAT_S16 ((snd_pcm_format_t) SNDRV_PCM_FORMAT_S16)
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#define SND_PCM_FORMAT_U16 ((snd_pcm_format_t) SNDRV_PCM_FORMAT_U16)
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#define SND_PCM_FORMAT_S24 ((snd_pcm_format_t) SNDRV_PCM_FORMAT_S24)
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#define SND_PCM_FORMAT_U24 ((snd_pcm_format_t) SNDRV_PCM_FORMAT_U24)
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#define SND_PCM_FORMAT_S32 ((snd_pcm_format_t) SNDRV_PCM_FORMAT_S32)
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#define SND_PCM_FORMAT_U32 ((snd_pcm_format_t) SNDRV_PCM_FORMAT_U32)
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#define SND_PCM_FORMAT_FLOAT ((snd_pcm_format_t) SNDRV_PCM_FORMAT_FLOAT)
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#define SND_PCM_FORMAT_FLOAT64 ((snd_pcm_format_t) SNDRV_PCM_FORMAT_FLOAT64)
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#define SND_PCM_FORMAT_IEC958_SUBFRAME ((snd_pcm_format_t) SNDRV_PCM_FORMAT_IEC958_SUBFRAME)
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#define SND_PCM_FORMAT_S16 ((snd_pcm_format_t) SNDRV_PCM_FORMAT_S16)
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#define SND_PCM_FORMAT_U16 ((snd_pcm_format_t) SNDRV_PCM_FORMAT_U16)
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#define SND_PCM_FORMAT_S24 ((snd_pcm_format_t) SNDRV_PCM_FORMAT_S24)
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#define SND_PCM_FORMAT_U24 ((snd_pcm_format_t) SNDRV_PCM_FORMAT_U24)
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#define SND_PCM_FORMAT_S32 ((snd_pcm_format_t) SNDRV_PCM_FORMAT_S32)
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#define SND_PCM_FORMAT_U32 ((snd_pcm_format_t) SNDRV_PCM_FORMAT_U32)
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#define SND_PCM_FORMAT_FLOAT ((snd_pcm_format_t) SNDRV_PCM_FORMAT_FLOAT)
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#define SND_PCM_FORMAT_FLOAT64 ((snd_pcm_format_t) SNDRV_PCM_FORMAT_FLOAT64)
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#define SND_PCM_FORMAT_IEC958_SUBFRAME ((snd_pcm_format_t) SNDRV_PCM_FORMAT_IEC958_SUBFRAME)
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#define SND_PCM_SUBFORMAT_STD ((snd_pcm_subformat_t) SNDRV_PCM_SUBFORMAT_STD)
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#define SND_PCM_SUBFORMAT_LAST ((snd_pcm_subformat_t) SNDRV_PCM_SUBFORMAT_LAST)
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#define SND_PCM_STATE_OPEN ((snd_pcm_state_t) SNDRV_PCM_STATE_OPEN)
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#define SND_PCM_STATE_SETUP ((snd_pcm_state_t) SNDRV_PCM_STATE_SETUP)
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#define SND_PCM_STATE_PREPARED ((snd_pcm_state_t) SNDRV_PCM_STATE_PREPARED)
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#define SND_PCM_STATE_RUNNING ((snd_pcm_state_t) SNDRV_PCM_STATE_RUNNING)
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#define SND_PCM_STATE_XRUN ((snd_pcm_state_t) SNDRV_PCM_STATE_XRUN)
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#define SND_PCM_STATE_DRAINING ((snd_pcm_state_t) SNDRV_PCM_STATE_DRAINING)
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#define SND_PCM_STATE_PAUSED ((snd_pcm_state_t) SNDRV_PCM_STATE_PAUSED)
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#define SND_PCM_STATE_LAST ((snd_pcm_state_t) SNDRV_PCM_STATE_LAST)
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#define SND_PCM_START_DATA ((snd_pcm_start_t) SNDRV_PCM_START_DATA)
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#define SND_PCM_START_EXPLICIT ((snd_pcm_start_t) SNDRV_PCM_START_EXPLICIT)
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#define SND_PCM_START_LAST ((snd_pcm_start_t) SNDRV_PCM_START_LAST)
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#define SND_PCM_XRUN_NONE ((snd_pcm_xrun_t) SNDRV_PCM_XRUN_NONE)
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#define SND_PCM_XRUN_STOP ((snd_pcm_xrun_t) SNDRV_PCM_XRUN_STOP)
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#define SND_PCM_XRUN_LAST ((snd_pcm_xrun_t) SNDRV_PCM_XRUN_LAST)
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#define SND_PCM_TSTAMP_NONE ((snd_pcm_tstamp_t) SNDRV_PCM_TSTAMP_NONE)
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#define SND_PCM_TSTAMP_MMAP ((snd_pcm_tstamp_t) SNDRV_PCM_TSTAMP_MMAP)
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#define SND_PCM_TSTAMP_LAST ((snd_pcm_tstamp_t) SNDRV_PCM_TSTAMP_LAST)
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typedef sndrv_pcm_uframes_t snd_pcm_uframes_t;
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typedef sndrv_pcm_sframes_t snd_pcm_sframes_t;
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typedef struct timeval snd_timestamp_t;
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#define SND_PCM_INFO_MMAP SNDRV_PCM_INFO_MMAP
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#define SND_PCM_INFO_MMAP_VALID SNDRV_PCM_INFO_MMAP_VALID
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#define SND_PCM_INFO_DOUBLE SNDRV_PCM_INFO_DOUBLE
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#define SND_PCM_INFO_BATCH SNDRV_PCM_INFO_BATCH
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#define SND_PCM_INFO_INTERLEAVED SNDRV_PCM_INFO_INTERLEAVED
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#define SND_PCM_INFO_NONINTERLEAVED SNDRV_PCM_INFO_NONINTERLEAVED
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#define SND_PCM_INFO_COMPLEX SNDRV_PCM_INFO_COMPLEX
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#define SND_PCM_INFO_BLOCK_TRANSFER SNDRV_PCM_INFO_BLOCK_TRANSFER
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#define SND_PCM_INFO_OVERRANGE SNDRV_PCM_INFO_OVERRANGE
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#define SND_PCM_INFO_PAUSE SNDRV_PCM_INFO_PAUSE
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#define SND_PCM_INFO_HALF_DUPLEX SNDRV_PCM_INFO_HALF_DUPLEX
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#define SND_PCM_INFO_JOINT_DUPLEX SNDRV_PCM_INFO_JOINT_DUPLEX
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#define SND_PCM_INFO_SYNC_START SNDRV_PCM_INFO_SYNC_START
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#define SND_PCM_MMAP_OFFSET_DATA SNDRV_PCM_MMAP_OFFSET_DATA
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#define SND_PCM_MMAP_OFFSET_STATUS SNDRV_PCM_MMAP_OFFSET_STATUS
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#define SND_PCM_MMAP_OFFSET_CONTROL SNDRV_PCM_MMAP_OFFSET_CONTROL
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#define SND_PCM_NONBLOCK 0x0001
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#define SND_PCM_ASYNC 0x0002
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typedef struct _snd_pcm snd_pcm_t;
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enum _snd_pcm_type {
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SND_PCM_TYPE_HW,
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SND_PCM_TYPE_MULTI,
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SND_PCM_TYPE_FILE,
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SND_PCM_TYPE_NULL,
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SND_PCM_TYPE_SHM,
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SND_PCM_TYPE_INET,
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SND_PCM_TYPE_COPY,
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SND_PCM_TYPE_LINEAR,
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SND_PCM_TYPE_ALAW,
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SND_PCM_TYPE_MULAW,
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SND_PCM_TYPE_ADPCM,
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SND_PCM_TYPE_RATE,
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SND_PCM_TYPE_ROUTE,
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SND_PCM_TYPE_PLUG,
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SND_PCM_TYPE_SHARE,
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SND_PCM_TYPE_MIX,
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SND_PCM_TYPE_DROUTE,
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SND_PCM_TYPE_LBSERVER,
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};
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#ifdef SND_ENUM_TYPECHECK
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typedef struct __snd_pcm_type *snd_pcm_type_t;
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#else
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typedef enum _snd_pcm_type snd_pcm_type_t;
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#endif
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#define SND_PCM_TYPE_HW ((snd_pcm_type_t) SND_PCM_TYPE_HW)
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#define SND_PCM_TYPE_MULTI ((snd_pcm_type_t) SND_PCM_TYPE_MULTI)
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#define SND_PCM_TYPE_FILE ((snd_pcm_type_t) SND_PCM_TYPE_FILE)
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#define SND_PCM_TYPE_NULL ((snd_pcm_type_t) SND_PCM_TYPE_NULL)
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#define SND_PCM_TYPE_SHM ((snd_pcm_type_t) SND_PCM_TYPE_SHM)
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#define SND_PCM_TYPE_INET ((snd_pcm_type_t) SND_PCM_TYPE_INET)
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#define SND_PCM_TYPE_COPY ((snd_pcm_type_t) SND_PCM_TYPE_COPY)
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#define SND_PCM_TYPE_LINEAR ((snd_pcm_type_t) SND_PCM_TYPE_LINEAR)
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#define SND_PCM_TYPE_ALAW ((snd_pcm_type_t) SND_PCM_TYPE_ALAW)
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#define SND_PCM_TYPE_MULAW ((snd_pcm_type_t) SND_PCM_TYPE_MULAW)
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#define SND_PCM_TYPE_ADPCM ((snd_pcm_type_t) SND_PCM_TYPE_ADPCM)
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#define SND_PCM_TYPE_RATE ((snd_pcm_type_t) SND_PCM_TYPE_RATE)
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#define SND_PCM_TYPE_ROUTE ((snd_pcm_type_t) SND_PCM_TYPE_ROUTE)
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#define SND_PCM_TYPE_PLUG ((snd_pcm_type_t) SND_PCM_TYPE_PLUG)
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#define SND_PCM_TYPE_SHARE ((snd_pcm_type_t) SND_PCM_TYPE_SHARE)
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#define SND_PCM_TYPE_MIX ((snd_pcm_type_t) SND_PCM_TYPE_MIX)
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#define SND_PCM_TYPE_DROUTE ((snd_pcm_type_t) SND_PCM_TYPE_DROUTE)
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#define SND_PCM_TYPE_LBSERVER ((snd_pcm_type_t) SND_PCM_TYPE_LBSERVER)
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typedef struct _snd_pcm_channel_area {
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void *addr; /* base address of channel samples */
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unsigned int first; /* offset to first sample in bits */
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unsigned int step; /* samples distance in bits */
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} snd_pcm_channel_area_t;
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#ifdef __cplusplus
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extern "C" {
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#endif
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int snd_pcm_open(snd_pcm_t **pcm, char *name,
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snd_pcm_stream_t stream, int mode);
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snd_pcm_type_t snd_pcm_type(snd_pcm_t *pcm);
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int snd_pcm_close(snd_pcm_t *pcm);
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int snd_pcm_poll_descriptor(snd_pcm_t *pcm);
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int snd_pcm_nonblock(snd_pcm_t *pcm, int nonblock);
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int snd_pcm_async(snd_pcm_t *pcm, int sig, pid_t pid);
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int snd_pcm_info(snd_pcm_t *pcm, snd_pcm_info_t *info);
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int snd_pcm_hw_refine(snd_pcm_t *pcm, snd_pcm_hw_params_t *params);
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int snd_pcm_hw_params(snd_pcm_t *pcm, snd_pcm_hw_params_t *params);
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int snd_pcm_hw_free(snd_pcm_t *pcm);
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int snd_pcm_sw_params(snd_pcm_t *pcm, snd_pcm_sw_params_t *params);
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int snd_pcm_prepare(snd_pcm_t *pcm);
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int snd_pcm_reset(snd_pcm_t *pcm);
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int snd_pcm_status(snd_pcm_t *pcm, snd_pcm_status_t *status);
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int snd_pcm_start(snd_pcm_t *pcm);
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int snd_pcm_drop(snd_pcm_t *pcm);
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int snd_pcm_drain(snd_pcm_t *pcm);
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int snd_pcm_pause(snd_pcm_t *pcm, int enable);
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snd_pcm_state_t snd_pcm_state(snd_pcm_t *pcm);
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int snd_pcm_delay(snd_pcm_t *pcm, snd_pcm_sframes_t *delayp);
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snd_pcm_sframes_t snd_pcm_rewind(snd_pcm_t *pcm, snd_pcm_uframes_t frames);
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snd_pcm_sframes_t snd_pcm_writei(snd_pcm_t *pcm, const void *buffer, snd_pcm_uframes_t size);
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snd_pcm_sframes_t snd_pcm_readi(snd_pcm_t *pcm, void *buffer, snd_pcm_uframes_t size);
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snd_pcm_sframes_t snd_pcm_writen(snd_pcm_t *pcm, void **bufs, snd_pcm_uframes_t size);
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snd_pcm_sframes_t snd_pcm_readn(snd_pcm_t *pcm, void **bufs, snd_pcm_uframes_t size);
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int snd_pcm_dump_hw_setup(snd_pcm_t *pcm, snd_output_t *out);
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int snd_pcm_dump_sw_setup(snd_pcm_t *pcm, snd_output_t *out);
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int snd_pcm_dump_setup(snd_pcm_t *pcm, snd_output_t *out);
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int snd_pcm_dump(snd_pcm_t *pcm, snd_output_t *out);
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int snd_pcm_link(snd_pcm_t *pcm1, snd_pcm_t *pcm2);
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int snd_pcm_unlink(snd_pcm_t *pcm);
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int snd_pcm_wait(snd_pcm_t *pcm, int timeout);
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snd_pcm_sframes_t snd_pcm_avail_update(snd_pcm_t *pcm);
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/* HW params */
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int snd_pcm_hw_params_any(snd_pcm_t *pcm, snd_pcm_hw_params_t *params);
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int snd_pcm_hw_params_try_explain_failure(snd_pcm_t *pcm,
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snd_pcm_hw_params_t *fail,
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snd_pcm_hw_params_t *success,
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unsigned int depth,
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snd_output_t *out);
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int snd_pcm_hw_params_get_rate_numden(const snd_pcm_hw_params_t *params,
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unsigned int *rate_num,
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unsigned int *rate_den);
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int snd_pcm_hw_params_get_sbits(const snd_pcm_hw_params_t *params);
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int snd_pcm_hw_params_get_flags(const snd_pcm_hw_params_t *params);
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int snd_pcm_hw_params_get_fifo_size(const snd_pcm_hw_params_t *params);
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int snd_pcm_hw_params_dump(snd_pcm_hw_params_t *params, snd_output_t *out);
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typedef struct _snd_pcm_hw_strategy snd_pcm_hw_strategy_t;
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/* choices need to be sorted on ascending badness */
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typedef struct _snd_pcm_hw_strategy_simple_choices_list {
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unsigned int value;
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unsigned int badness;
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} snd_pcm_hw_strategy_simple_choices_list_t;
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int snd_pcm_hw_params_strategy(snd_pcm_t *pcm, snd_pcm_hw_params_t *params,
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const snd_pcm_hw_strategy_t *strategy,
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unsigned int badness_min,
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unsigned int badness_max);
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void snd_pcm_hw_strategy_free(snd_pcm_hw_strategy_t *strategy);
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int snd_pcm_hw_strategy_simple(snd_pcm_hw_strategy_t **strategyp,
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unsigned int badness_min,
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unsigned int badness_max);
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int snd_pcm_sw_params_current(snd_pcm_t *pcm, snd_pcm_sw_params_t *params);
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int snd_pcm_sw_params_dump(snd_pcm_sw_params_t *params, snd_output_t *out);
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int snd_pcm_status_dump(snd_pcm_status_t *status, snd_output_t *out);
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/* mmap */
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const snd_pcm_channel_area_t *snd_pcm_mmap_areas(snd_pcm_t *pcm);
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const snd_pcm_channel_area_t *snd_pcm_mmap_running_areas(snd_pcm_t *pcm);
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const snd_pcm_channel_area_t *snd_pcm_mmap_stopped_areas(snd_pcm_t *pcm);
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snd_pcm_sframes_t snd_pcm_mmap_forward(snd_pcm_t *pcm, snd_pcm_uframes_t size);
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snd_pcm_uframes_t snd_pcm_mmap_offset(snd_pcm_t *pcm);
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snd_pcm_uframes_t snd_pcm_mmap_xfer(snd_pcm_t *pcm, snd_pcm_uframes_t size);
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snd_pcm_sframes_t snd_pcm_mmap_writei(snd_pcm_t *pcm, const void *buffer, snd_pcm_uframes_t size);
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snd_pcm_sframes_t snd_pcm_mmap_readi(snd_pcm_t *pcm, void *buffer, snd_pcm_uframes_t size);
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snd_pcm_sframes_t snd_pcm_mmap_writen(snd_pcm_t *pcm, void **bufs, snd_pcm_uframes_t size);
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snd_pcm_sframes_t snd_pcm_mmap_readn(snd_pcm_t *pcm, void **bufs, snd_pcm_uframes_t size);
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const char *snd_pcm_stream_name(snd_pcm_stream_t stream);
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const char *snd_pcm_access_name(snd_pcm_access_t access);
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const char *snd_pcm_format_name(snd_pcm_format_t format);
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const char *snd_pcm_subformat_name(snd_pcm_subformat_t subformat);
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const char *snd_pcm_format_description(snd_pcm_format_t format);
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snd_pcm_format_t snd_pcm_format_value(const char* name);
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const char *snd_pcm_start_mode_name(snd_pcm_start_t mode);
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const char *snd_pcm_xrun_mode_name(snd_pcm_xrun_t mode);
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const char *snd_pcm_tstamp_mode_name(snd_pcm_tstamp_t mode);
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const char *snd_pcm_state_name(snd_pcm_state_t state);
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int snd_pcm_area_silence(const snd_pcm_channel_area_t *dst_channel, snd_pcm_uframes_t dst_offset,
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unsigned int samples, snd_pcm_format_t format);
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int snd_pcm_areas_silence(const snd_pcm_channel_area_t *dst_channels, snd_pcm_uframes_t dst_offset,
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unsigned int channels, snd_pcm_uframes_t frames, snd_pcm_format_t format);
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int snd_pcm_area_copy(const snd_pcm_channel_area_t *dst_channel, snd_pcm_uframes_t dst_offset,
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const snd_pcm_channel_area_t *src_channel, snd_pcm_uframes_t src_offset,
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unsigned int samples, snd_pcm_format_t format);
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int snd_pcm_areas_copy(const snd_pcm_channel_area_t *dst_channels, snd_pcm_uframes_t dst_offset,
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const snd_pcm_channel_area_t *src_channels, snd_pcm_uframes_t src_offset,
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unsigned int channels, snd_pcm_uframes_t frames, snd_pcm_format_t format);
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snd_pcm_sframes_t snd_pcm_bytes_to_frames(snd_pcm_t *pcm, ssize_t bytes);
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ssize_t snd_pcm_frames_to_bytes(snd_pcm_t *pcm, snd_pcm_sframes_t frames);
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int snd_pcm_bytes_to_samples(snd_pcm_t *pcm, ssize_t bytes);
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ssize_t snd_pcm_samples_to_bytes(snd_pcm_t *pcm, int samples);
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/* misc */
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int snd_pcm_format_signed(snd_pcm_format_t format);
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int snd_pcm_format_unsigned(snd_pcm_format_t format);
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int snd_pcm_format_linear(snd_pcm_format_t format);
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int snd_pcm_format_little_endian(snd_pcm_format_t format);
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int snd_pcm_format_big_endian(snd_pcm_format_t format);
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int snd_pcm_format_cpu_endian(snd_pcm_format_t format);
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int snd_pcm_format_width(snd_pcm_format_t format); /* in bits */
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int snd_pcm_format_physical_width(snd_pcm_format_t format); /* in bits */
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snd_pcm_format_t snd_pcm_build_linear_format(int width, int unsignd, int big_endian);
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ssize_t snd_pcm_format_size(snd_pcm_format_t format, size_t samples);
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u_int8_t snd_pcm_format_silence(snd_pcm_format_t format);
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u_int16_t snd_pcm_format_silence_16(snd_pcm_format_t format);
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u_int32_t snd_pcm_format_silence_32(snd_pcm_format_t format);
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u_int64_t snd_pcm_format_silence_64(snd_pcm_format_t format);
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int snd_pcm_format_set_silence(snd_pcm_format_t format, void *buf, unsigned int samples);
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#ifdef __cplusplus
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}
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#endif
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