pcm.h

socle開發板 移植Picture_Wave套件 可在螢幕上顯示照片並利用觸碰螢幕方式移動 kernel-2.6.19 crosstool-gcc-3.4.5

/** \} */

/**
 * \defgroup PCM_Description Description Functions
 * \ingroup PCM
 * See the \ref pcm page for more details.
 * \{
 */

const char *snd_pcm_type_name(snd_pcm_type_t type);
const char *snd_pcm_stream_name(const snd_pcm_stream_t stream);
const char *snd_pcm_access_name(const snd_pcm_access_t _access);
const char *snd_pcm_format_name(const snd_pcm_format_t format);
const char *snd_pcm_format_description(const snd_pcm_format_t format);
const char *snd_pcm_subformat_name(const snd_pcm_subformat_t subformat);
const char *snd_pcm_subformat_description(const snd_pcm_subformat_t subformat);
snd_pcm_format_t snd_pcm_format_value(const char* name);
const char *snd_pcm_tstamp_mode_name(const snd_pcm_tstamp_t mode);
const char *snd_pcm_state_name(const snd_pcm_state_t state);

/** \} */

/**
 * \defgroup PCM_Dump Debug Functions
 * \ingroup PCM
 * See the \ref pcm page for more details.
 * \{
 */

int snd_pcm_dump(snd_pcm_t *pcm, snd_output_t *out);
int snd_pcm_dump_hw_setup(snd_pcm_t *pcm, snd_output_t *out);
int snd_pcm_dump_sw_setup(snd_pcm_t *pcm, snd_output_t *out);
int snd_pcm_dump_setup(snd_pcm_t *pcm, snd_output_t *out);
int snd_pcm_hw_params_dump(snd_pcm_hw_params_t *params, snd_output_t *out);
int snd_pcm_sw_params_dump(snd_pcm_sw_params_t *params, snd_output_t *out);
int snd_pcm_status_dump(snd_pcm_status_t *status, snd_output_t *out);

/** \} */

/**
 * \defgroup PCM_Direct Direct Access (MMAP) Functions
 * \ingroup PCM
 * See the \ref pcm page for more details.
 * \{
 */

int snd_pcm_mmap_begin(snd_pcm_t *pcm,
		       const snd_pcm_channel_area_t **areas,
		       snd_pcm_uframes_t *offset,
		       snd_pcm_uframes_t *frames);
snd_pcm_sframes_t snd_pcm_mmap_commit(snd_pcm_t *pcm,
				      snd_pcm_uframes_t offset,
				      snd_pcm_uframes_t frames);
snd_pcm_sframes_t snd_pcm_mmap_writei(snd_pcm_t *pcm, const void *buffer, snd_pcm_uframes_t size);
snd_pcm_sframes_t snd_pcm_mmap_readi(snd_pcm_t *pcm, void *buffer, snd_pcm_uframes_t size);
snd_pcm_sframes_t snd_pcm_mmap_writen(snd_pcm_t *pcm, void **bufs, snd_pcm_uframes_t size);
snd_pcm_sframes_t snd_pcm_mmap_readn(snd_pcm_t *pcm, void **bufs, snd_pcm_uframes_t size);                                                                

/** \} */

/**
 * \defgroup PCM_Helpers Helper Functions
 * \ingroup PCM
 * See the \ref pcm page for more details.
 * \{
 */

int snd_pcm_format_signed(snd_pcm_format_t format);
int snd_pcm_format_unsigned(snd_pcm_format_t format);
int snd_pcm_format_linear(snd_pcm_format_t format);
int snd_pcm_format_float(snd_pcm_format_t format);
int snd_pcm_format_little_endian(snd_pcm_format_t format);
int snd_pcm_format_big_endian(snd_pcm_format_t format);
int snd_pcm_format_cpu_endian(snd_pcm_format_t format);
int snd_pcm_format_width(snd_pcm_format_t format);			/* in bits */
int snd_pcm_format_physical_width(snd_pcm_format_t format);		/* in bits */
snd_pcm_format_t snd_pcm_build_linear_format(int width, int pwidth, int unsignd, int big_endian);
ssize_t snd_pcm_format_size(snd_pcm_format_t format, size_t samples);
u_int8_t snd_pcm_format_silence(snd_pcm_format_t format);
u_int16_t snd_pcm_format_silence_16(snd_pcm_format_t format);
u_int32_t snd_pcm_format_silence_32(snd_pcm_format_t format);
u_int64_t 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 samples);

snd_pcm_sframes_t snd_pcm_bytes_to_frames(snd_pcm_t *pcm, ssize_t bytes);
ssize_t snd_pcm_frames_to_bytes(snd_pcm_t *pcm, snd_pcm_sframes_t frames);
long snd_pcm_bytes_to_samples(snd_pcm_t *pcm, ssize_t bytes);
ssize_t snd_pcm_samples_to_bytes(snd_pcm_t *pcm, long samples);

int snd_pcm_area_silence(const snd_pcm_channel_area_t *dst_channel, snd_pcm_uframes_t dst_offset,
			 unsigned int samples, snd_pcm_format_t format);
int snd_pcm_areas_silence(const snd_pcm_channel_area_t *dst_channels, snd_pcm_uframes_t dst_offset,
			  unsigned int channels, snd_pcm_uframes_t frames, snd_pcm_format_t format);
int snd_pcm_area_copy(const snd_pcm_channel_area_t *dst_channel, snd_pcm_uframes_t dst_offset,
		      const snd_pcm_channel_area_t *src_channel, snd_pcm_uframes_t src_offset,
		      unsigned int samples, snd_pcm_format_t format);
int snd_pcm_areas_copy(const snd_pcm_channel_area_t *dst_channels, snd_pcm_uframes_t dst_offset,
		       const snd_pcm_channel_area_t *src_channels, snd_pcm_uframes_t src_offset,
		       unsigned int channels, snd_pcm_uframes_t frames, snd_pcm_format_t format);

/** \} */

/**
 * \defgroup PCM_Hook Hook Extension
 * \ingroup PCM
 * See the \ref pcm page for more details.
 * \{
 */

/** type of pcm hook */
typedef enum _snd_pcm_hook_type {
	SND_PCM_HOOK_TYPE_HW_PARAMS = 0,
	SND_PCM_HOOK_TYPE_HW_FREE,
	SND_PCM_HOOK_TYPE_CLOSE,
	SND_PCM_HOOK_TYPE_LAST = SND_PCM_HOOK_TYPE_CLOSE
} snd_pcm_hook_type_t;

/** PCM hook container */
typedef struct _snd_pcm_hook snd_pcm_hook_t;
/** PCM hook callback function */
typedef int (*snd_pcm_hook_func_t)(snd_pcm_hook_t *hook);
snd_pcm_t *snd_pcm_hook_get_pcm(snd_pcm_hook_t *hook);
void *snd_pcm_hook_get_private(snd_pcm_hook_t *hook);
void snd_pcm_hook_set_private(snd_pcm_hook_t *hook, void *private_data);
int snd_pcm_hook_add(snd_pcm_hook_t **hookp, snd_pcm_t *pcm,
		     snd_pcm_hook_type_t type,
		     snd_pcm_hook_func_t func, void *private_data);
int snd_pcm_hook_remove(snd_pcm_hook_t *hook);

/** \} */

/**
 * \defgroup PCM_Scope Scope Plugin Extension
 * \ingroup PCM
 * See the \ref pcm page for more details.
 * \{
 */

/** #SND_PCM_TYPE_METER scope functions */
typedef struct _snd_pcm_scope_ops {
	/** \brief Enable and prepare it using current params
	 * \param scope scope handle
	 */
	int (*enable)(snd_pcm_scope_t *scope);
	/** \brief Disable
	 * \param scope scope handle
	 */
	void (*disable)(snd_pcm_scope_t *scope);
	/** \brief PCM has been started
	 * \param scope scope handle
	 */
	void (*start)(snd_pcm_scope_t *scope);
	/** \brief PCM has been stopped
	 * \param scope scope handle
	 */
	void (*stop)(snd_pcm_scope_t *scope);
	/** \brief New frames are present
	 * \param scope scope handle
	 */
	void (*update)(snd_pcm_scope_t *scope);
	/** \brief Reset status
	 * \param scope scope handle
	 */
	void (*reset)(snd_pcm_scope_t *scope);
	/** \brief PCM is closing
	 * \param scope scope handle
	 */
	void (*close)(snd_pcm_scope_t *scope);
} snd_pcm_scope_ops_t;

snd_pcm_uframes_t snd_pcm_meter_get_bufsize(snd_pcm_t *pcm);
unsigned int snd_pcm_meter_get_channels(snd_pcm_t *pcm);
unsigned int snd_pcm_meter_get_rate(snd_pcm_t *pcm);
snd_pcm_uframes_t snd_pcm_meter_get_now(snd_pcm_t *pcm);
snd_pcm_uframes_t snd_pcm_meter_get_boundary(snd_pcm_t *pcm);
int snd_pcm_meter_add_scope(snd_pcm_t *pcm, snd_pcm_scope_t *scope);
snd_pcm_scope_t *snd_pcm_meter_search_scope(snd_pcm_t *pcm, const char *name);
int snd_pcm_scope_malloc(snd_pcm_scope_t **ptr);
void snd_pcm_scope_set_ops(snd_pcm_scope_t *scope, snd_pcm_scope_ops_t *val);
void snd_pcm_scope_set_name(snd_pcm_scope_t *scope, const char *val);
const char *snd_pcm_scope_get_name(snd_pcm_scope_t *scope);
void *snd_pcm_scope_get_callback_private(snd_pcm_scope_t *scope);
void snd_pcm_scope_set_callback_private(snd_pcm_scope_t *scope, void *val);
int snd_pcm_scope_s16_open(snd_pcm_t *pcm, const char *name,
			   snd_pcm_scope_t **scopep);
int16_t *snd_pcm_scope_s16_get_channel_buffer(snd_pcm_scope_t *scope,
					      unsigned int channel);

/** \} */

/**
 * \defgroup PCM_Simple Simple setup functions
 * \ingroup PCM
 * See the \ref pcm page for more details.
 * \{
 */

/** Simple PCM latency type */
typedef enum _snd_spcm_latency {
	/** standard latency - for standard playback or capture
            (estimated latency in one direction 350ms) */
	SND_SPCM_LATENCY_STANDARD = 0,
	/** medium latency - software phones etc.
	    (estimated latency in one direction maximally 25ms */
	SND_SPCM_LATENCY_MEDIUM,
	/** realtime latency - realtime applications (effect processors etc.)
	    (estimated latency in one direction 5ms and better) */
	SND_SPCM_LATENCY_REALTIME
} snd_spcm_latency_t;

/** Simple PCM xrun type */
typedef enum _snd_spcm_xrun_type {
	/** driver / library will ignore all xruns, the stream runs forever */
	SND_SPCM_XRUN_IGNORE = 0,
	/** driver / library stops the stream when an xrun occurs */
	SND_SPCM_XRUN_STOP
} snd_spcm_xrun_type_t;

/** Simple PCM duplex type */
typedef enum _snd_spcm_duplex_type {
	/** liberal duplex - the buffer and period sizes might not match */
	SND_SPCM_DUPLEX_LIBERAL = 0,
	/** pedantic duplex - the buffer and period sizes MUST match */
	SND_SPCM_DUPLEX_PEDANTIC
} snd_spcm_duplex_type_t;

int snd_spcm_init(snd_pcm_t *pcm,
		  unsigned int rate,
		  unsigned int channels,
		  snd_pcm_format_t format,
		  snd_pcm_subformat_t subformat,
		  snd_spcm_latency_t latency,
		  snd_pcm_access_t _access,
		  snd_spcm_xrun_type_t xrun_type);

int snd_spcm_init_duplex(snd_pcm_t *playback_pcm,
			 snd_pcm_t *capture_pcm,
			 unsigned int rate,
			 unsigned int channels,
			 snd_pcm_format_t format,
			 snd_pcm_subformat_t subformat,
			 snd_spcm_latency_t latency,
			 snd_pcm_access_t _access,
			 snd_spcm_xrun_type_t xrun_type,
			 snd_spcm_duplex_type_t duplex_type);

int snd_spcm_init_get_params(snd_pcm_t *pcm,
			     unsigned int *rate,
			     snd_pcm_uframes_t *buffer_size,
			     snd_pcm_uframes_t *period_size);

/** \} */

/**
 * \defgroup PCM_Deprecated Deprecated Functions
 * \ingroup PCM
 * See the \ref pcm page for more details.
 * \{
 */

/* Deprecated functions, for compatibility */
const char *snd_pcm_start_mode_name(snd_pcm_start_t mode);
const char *snd_pcm_xrun_mode_name(snd_pcm_xrun_t mode);
int snd_pcm_sw_params_set_start_mode(snd_pcm_t *pcm, snd_pcm_sw_params_t *params, snd_pcm_start_t val);
snd_pcm_start_t snd_pcm_sw_params_get_start_mode(const snd_pcm_sw_params_t *params);
int snd_pcm_sw_params_set_xrun_mode(snd_pcm_t *pcm, snd_pcm_sw_params_t *params, snd_pcm_xrun_t val);
snd_pcm_xrun_t snd_pcm_sw_params_get_xrun_mode(const snd_pcm_sw_params_t *params);

/** \} */

#ifdef __cplusplus
}
#endif

#endif /* __ALSA_PCM_H */