mirror of
https://github.com/alsa-project/alsa-lib.git
synced 2025-11-03 09:01:52 -05:00
458 lines
18 KiB
C
458 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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/** PCM generic info container */
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typedef struct _snd_pcm_info snd_pcm_info_t;
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/** PCM hardware configuration space container */
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typedef struct _snd_pcm_hw_params snd_pcm_hw_params_t;
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/** PCM software configuration container */
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typedef struct _snd_pcm_sw_params snd_pcm_sw_params_t;
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/** PCM status container */
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typedef struct _snd_pcm_status snd_pcm_status_t;
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/** PCM access types mask */
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typedef struct _snd_pcm_access_mask snd_pcm_access_mask_t;
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/** PCM formats mask */
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typedef struct _snd_pcm_format_mask snd_pcm_format_mask_t;
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/** PCM subformats mask */
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typedef struct _snd_pcm_subformat_mask snd_pcm_subformat_mask_t;
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/** PCM class */
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typedef enum _snd_pcm_class {
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/** standard device */
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SND_PCM_CLASS_GENERIC = SNDRV_PCM_CLASS_GENERIC,
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/** multichannel device */
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SND_PCM_CLASS_MULTI = SNDRV_PCM_CLASS_MULTI,
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/** software modem device */
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SND_PCM_CLASS_MODEM = SNDRV_PCM_CLASS_MODEM,
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/** digitizer device */
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SND_PCM_CLASS_DIGITIZER = SNDRV_PCM_CLASS_DIGITIZER,
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SND_PCM_CLASS_LAST = SNDRV_PCM_CLASS_LAST,
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} snd_pcm_class_t;
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/** PCM subclass */
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typedef enum _snd_pcm_subclass {
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/** subdevices are mixed together */
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SND_PCM_SUBCLASS_GENERIC_MIX = SNDRV_PCM_SUBCLASS_GENERIC_MIX,
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/** multichannel subdevices are mixed together */
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SND_PCM_SUBCLASS_MULTI_MIX = SNDRV_PCM_SUBCLASS_MULTI_MIX,
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SND_PCM_SUBCLASS_LAST = SNDRV_PCM_SUBCLASS_LAST,
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} snd_pcm_subclass_t;
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/** PCM stream (direction) */
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typedef enum _snd_pcm_stream {
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/** Playback stream */
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SND_PCM_STREAM_PLAYBACK = SNDRV_PCM_STREAM_PLAYBACK,
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/** Capture stream */
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SND_PCM_STREAM_CAPTURE = SNDRV_PCM_STREAM_CAPTURE,
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SND_PCM_STREAM_LAST = SNDRV_PCM_STREAM_LAST,
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} snd_pcm_stream_t;
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/** PCM access type */
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typedef enum _snd_pcm_access {
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/** mmap access with simple interleaved channels */
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SND_PCM_ACCESS_MMAP_INTERLEAVED = SNDRV_PCM_ACCESS_MMAP_INTERLEAVED,
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/** mmap access with simple non interleaved channels */
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SND_PCM_ACCESS_MMAP_NONINTERLEAVED = SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED,
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/** mmap access with complex placement */
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SND_PCM_ACCESS_MMAP_COMPLEX = SNDRV_PCM_ACCESS_MMAP_COMPLEX,
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/** snd_pcm_readi/snd_pcm_writei access */
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SND_PCM_ACCESS_RW_INTERLEAVED = SNDRV_PCM_ACCESS_RW_INTERLEAVED,
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/** snd_pcm_readn/snd_pcm_writen access */
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SND_PCM_ACCESS_RW_NONINTERLEAVED = SNDRV_PCM_ACCESS_RW_NONINTERLEAVED,
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SND_PCM_ACCESS_LAST = SNDRV_PCM_ACCESS_LAST,
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} snd_pcm_access_t;
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/** PCM sample format */
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typedef enum _snd_pcm_format {
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/** Unknown */
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SND_PCM_FORMAT_UNKNOWN = -1,
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/** Signed 8 bit */
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SND_PCM_FORMAT_S8 = SNDRV_PCM_FORMAT_S8,
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/** Unsigned 8 bit */
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SND_PCM_FORMAT_U8 = SNDRV_PCM_FORMAT_U8,
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/** Signed 16 bit Little Endian */
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SND_PCM_FORMAT_S16_LE = SNDRV_PCM_FORMAT_S16_LE,
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/** Signed 16 bit Big Endian */
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SND_PCM_FORMAT_S16_BE = SNDRV_PCM_FORMAT_S16_BE,
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/** Unsigned 16 bit Little Endian */
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SND_PCM_FORMAT_U16_LE = SNDRV_PCM_FORMAT_U16_LE,
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/** Unsigned 16 bit Big Endian */
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SND_PCM_FORMAT_U16_BE = SNDRV_PCM_FORMAT_U16_BE,
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/** Signed 24 bit Little Endian */
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SND_PCM_FORMAT_S24_LE = SNDRV_PCM_FORMAT_S24_LE,
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/** Signed 24 bit Big Endian */
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SND_PCM_FORMAT_S24_BE = SNDRV_PCM_FORMAT_S24_BE,
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/** Unsigned 24 bit Little Endian */
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SND_PCM_FORMAT_U24_LE = SNDRV_PCM_FORMAT_U24_LE,
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/** Unsigned 24 bit Big Endian */
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SND_PCM_FORMAT_U24_BE = SNDRV_PCM_FORMAT_U24_BE,
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/** Signed 32 bit Little Endian */
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SND_PCM_FORMAT_S32_LE = SNDRV_PCM_FORMAT_S32_LE,
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/** Signed 32 bit Big Endian */
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SND_PCM_FORMAT_S32_BE = SNDRV_PCM_FORMAT_S32_BE,
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/** Unsigned 32 bit Little Endian */
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SND_PCM_FORMAT_U32_LE = SNDRV_PCM_FORMAT_U32_LE,
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/** Unsigned 32 bit Big Endian */
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SND_PCM_FORMAT_U32_BE = SNDRV_PCM_FORMAT_U32_BE,
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/** Float 32 bit Little Endian */
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SND_PCM_FORMAT_FLOAT_LE = SNDRV_PCM_FORMAT_FLOAT_LE,
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/** Float 32 bit Big Endian */
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SND_PCM_FORMAT_FLOAT_BE = SNDRV_PCM_FORMAT_FLOAT_BE,
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/** Float 64 bit Little Endian */
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SND_PCM_FORMAT_FLOAT64_LE = SNDRV_PCM_FORMAT_FLOAT64_LE,
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/** Float 64 bit Big Endian */
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SND_PCM_FORMAT_FLOAT64_BE = SNDRV_PCM_FORMAT_FLOAT64_BE,
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/** IEC-958 Little Endian */
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SND_PCM_FORMAT_IEC958_SUBFRAME_LE = SNDRV_PCM_FORMAT_IEC958_SUBFRAME_LE,
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/** IEC-958 Big Endian */
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SND_PCM_FORMAT_IEC958_SUBFRAME_BE = SNDRV_PCM_FORMAT_IEC958_SUBFRAME_BE,
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/** Mu-Law */
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SND_PCM_FORMAT_MU_LAW = SNDRV_PCM_FORMAT_MU_LAW,
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/** A-Law */
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SND_PCM_FORMAT_A_LAW = SNDRV_PCM_FORMAT_A_LAW,
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/** Ima-ADPCM */
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SND_PCM_FORMAT_IMA_ADPCM = SNDRV_PCM_FORMAT_IMA_ADPCM,
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/** MPEG */
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SND_PCM_FORMAT_MPEG = SNDRV_PCM_FORMAT_MPEG,
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/** GSM */
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SND_PCM_FORMAT_GSM = SNDRV_PCM_FORMAT_GSM,
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/** Special */
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SND_PCM_FORMAT_SPECIAL = SNDRV_PCM_FORMAT_SPECIAL,
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SND_PCM_FORMAT_LAST = SNDRV_PCM_FORMAT_LAST,
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/** Signed 16 bit CPU endian */
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SND_PCM_FORMAT_S16 = SNDRV_PCM_FORMAT_S16,
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/** Unsigned 16 bit CPU endian */
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SND_PCM_FORMAT_U16 = SNDRV_PCM_FORMAT_U16,
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/** Signed 24 bit CPU endian */
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SND_PCM_FORMAT_S24 = SNDRV_PCM_FORMAT_S24,
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/** Unsigned 24 bit CPU endian */
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SND_PCM_FORMAT_U24 = SNDRV_PCM_FORMAT_U24,
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/** Signed 32 bit CPU endian */
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SND_PCM_FORMAT_S32 = SNDRV_PCM_FORMAT_S32,
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/** Unsigned 32 bit CPU endian */
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SND_PCM_FORMAT_U32 = SNDRV_PCM_FORMAT_U32,
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/** Float 32 bit CPU endian */
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SND_PCM_FORMAT_FLOAT = SNDRV_PCM_FORMAT_FLOAT,
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/** Float 64 bit CPU endian */
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SND_PCM_FORMAT_FLOAT64 = SNDRV_PCM_FORMAT_FLOAT64,
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/** IEC-958 CPU Endian */
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SND_PCM_FORMAT_IEC958_SUBFRAME = SNDRV_PCM_FORMAT_IEC958_SUBFRAME,
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} snd_pcm_format_t;
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/** PCM sample subformat */
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typedef enum _snd_pcm_subformat {
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/** Standard */
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SND_PCM_SUBFORMAT_STD = SNDRV_PCM_SUBFORMAT_STD,
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SND_PCM_SUBFORMAT_LAST = SNDRV_PCM_SUBFORMAT_LAST,
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} snd_pcm_subformat_t;
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/** PCM state */
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typedef enum _snd_pcm_state {
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/** Open */
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SND_PCM_STATE_OPEN = SNDRV_PCM_STATE_OPEN,
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/** Setup installed */
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SND_PCM_STATE_SETUP = SNDRV_PCM_STATE_SETUP,
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/** Ready to start */
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SND_PCM_STATE_PREPARED = SNDRV_PCM_STATE_PREPARED,
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/** Running */
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SND_PCM_STATE_RUNNING = SNDRV_PCM_STATE_RUNNING,
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/** Stopped: underrun (playback) or overrun (capture) detected */
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SND_PCM_STATE_XRUN = SNDRV_PCM_STATE_XRUN,
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/** Draining: running (playback) or stopped (capture) */
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SND_PCM_STATE_DRAINING = SNDRV_PCM_STATE_DRAINING,
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/** Paused */
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SND_PCM_STATE_PAUSED = SNDRV_PCM_STATE_PAUSED,
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SND_PCM_STATE_LAST = SNDRV_PCM_STATE_LAST,
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} snd_pcm_state_t;
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/** PCM start mode */
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typedef enum _snd_pcm_start {
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/** Automatic start on data read/write */
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SND_PCM_START_DATA = SNDRV_PCM_START_DATA,
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/** Explicit start */
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SND_PCM_START_EXPLICIT = SNDRV_PCM_START_EXPLICIT,
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SND_PCM_START_LAST = SNDRV_PCM_START_LAST,
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} snd_pcm_start_t;
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/** PCM xrun mode */
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typedef enum _snd_pcm_xrun {
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/** Xrun detection disabled */
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SND_PCM_XRUN_NONE = SNDRV_PCM_XRUN_NONE,
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/** Stop on xrun detection */
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SND_PCM_XRUN_STOP = SNDRV_PCM_XRUN_STOP,
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SND_PCM_XRUN_LAST = SNDRV_PCM_XRUN_LAST,
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} snd_pcm_xrun_t;
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/** PCM timestamp mode */
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typedef enum _snd_pcm_tstamp {
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/** No timestamp */
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SND_PCM_TSTAMP_NONE = SNDRV_PCM_TSTAMP_NONE,
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/** Update mmap'ed timestamp */
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SND_PCM_TSTAMP_MMAP = SNDRV_PCM_TSTAMP_MMAP,
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SND_PCM_TSTAMP_LAST = SNDRV_PCM_TSTAMP_LAST,
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} snd_pcm_tstamp_t;
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/** Unsigned frames quantity */
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typedef sndrv_pcm_uframes_t snd_pcm_uframes_t;
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/** Signed frames quantity */
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typedef sndrv_pcm_sframes_t snd_pcm_sframes_t;
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/** Timestamp */
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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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/** Non blocking mode \hideinitializer */
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#define SND_PCM_NONBLOCK 0x0001
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/** Async notification \hideinitializer */
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#define SND_PCM_ASYNC 0x0002
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/** PCM handle */
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typedef struct _snd_pcm snd_pcm_t;
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/** PCM type */
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enum _snd_pcm_type {
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/** Kernel level PCM */
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SND_PCM_TYPE_HW,
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/** One ore more linked PCM with exclusive access to selected
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channels */
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SND_PCM_TYPE_MULTI,
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/** File writing plugin */
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SND_PCM_TYPE_FILE,
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/** Null endpoint PCM */
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SND_PCM_TYPE_NULL,
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/** Shared memory client PCM */
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SND_PCM_TYPE_SHM,
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/** INET client PCM (not yet implemented) */
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SND_PCM_TYPE_INET,
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/** Copying plugin */
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SND_PCM_TYPE_COPY,
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/** Linear format conversion PCM */
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SND_PCM_TYPE_LINEAR,
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/** A-Law format conversion PCM */
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SND_PCM_TYPE_ALAW,
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/** Mu-Law format conversion PCM */
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SND_PCM_TYPE_MULAW,
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/** IMA-ADPCM format conversion PCM */
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SND_PCM_TYPE_ADPCM,
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/** Rate conversion PCM */
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SND_PCM_TYPE_RATE,
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/** Attenuated static route PCM */
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SND_PCM_TYPE_ROUTE,
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/** Format adjusted PCM */
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SND_PCM_TYPE_PLUG,
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/** Sharing PCM */
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SND_PCM_TYPE_SHARE,
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/** Meter plugin */
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SND_PCM_TYPE_METER,
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/** Mixing PCM */
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SND_PCM_TYPE_MIX,
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/** Attenuated dynamic route PCM (not yet implemented) */
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SND_PCM_TYPE_DROUTE,
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/** Loopback server plugin (not yet implemented) */
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SND_PCM_TYPE_LBSERVER,
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};
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/** PCM type */
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typedef enum _snd_pcm_type snd_pcm_type_t;
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/** PCM area specification */
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typedef struct _snd_pcm_channel_area {
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/** base address of channel samples */
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void *addr;
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/** offset to first sample in bits */
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unsigned int first;
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/** samples distance in bits */
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unsigned int step;
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} snd_pcm_channel_area_t;
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typedef struct _snd_pcm_scope snd_pcm_scope_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, const 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_descriptors_count(snd_pcm_t *pcm);
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int snd_pcm_poll_descriptors(snd_pcm_t *pcm, struct pollfd *pfds, unsigned int space);
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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_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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const char *snd_pcm_name(snd_pcm_t *pcm);
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snd_pcm_type_t snd_pcm_type(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_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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/* meter */
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typedef struct _snd_pcm_scope_ops {
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int (*enable)(snd_pcm_scope_t *scope);
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void (*disable)(snd_pcm_scope_t *scope);
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void (*start)(snd_pcm_scope_t *scope);
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void (*stop)(snd_pcm_scope_t *scope);
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void (*update)(snd_pcm_scope_t *scope);
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void (*reset)(snd_pcm_scope_t *scope);
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void (*close)(snd_pcm_scope_t *scope);
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} snd_pcm_scope_ops_t;
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snd_pcm_uframes_t snd_pcm_meter_get_bufsize(snd_pcm_t *pcm);
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unsigned int snd_pcm_meter_get_channels(snd_pcm_t *pcm);
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unsigned int snd_pcm_meter_get_rate(snd_pcm_t *pcm);
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snd_pcm_uframes_t snd_pcm_meter_get_now(snd_pcm_t *pcm);
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snd_pcm_uframes_t snd_pcm_meter_get_boundary(snd_pcm_t *pcm);
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int snd_pcm_meter_add_scope(snd_pcm_t *pcm, snd_pcm_scope_t *scope);
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snd_pcm_scope_t *snd_pcm_meter_search_scope(snd_pcm_t *pcm, const char *name);
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int snd_pcm_scope_malloc(snd_pcm_scope_t **ptr);
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void snd_pcm_scope_set_ops(snd_pcm_scope_t *scope, snd_pcm_scope_ops_t *val);
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void snd_pcm_scope_set_name(snd_pcm_scope_t *scope, const char *val);
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const char *snd_pcm_scope_get_name(snd_pcm_scope_t *scope);
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void *snd_pcm_scope_get_callback_private(snd_pcm_scope_t *scope);
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void snd_pcm_scope_set_callback_private(snd_pcm_scope_t *scope, void *val);
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int snd_pcm_scope_s16_open(snd_pcm_t *pcm, const char *name,
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snd_pcm_scope_t **scopep);
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int16_t *snd_pcm_scope_s16_get_channel_buffer(snd_pcm_scope_t *scope,
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unsigned int channel);
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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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