78 lines
2.7 KiB
C
78 lines
2.7 KiB
C
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#ifndef SS_SOUND_H
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#define SS_SOUND_H
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/*
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* ss_sound.h: definition for SpiceStream that handle the capture from
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* the sound card : a 2 column data.
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*
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* include LICENSE
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*/
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typedef struct _SoundParams SoundParams;
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#ifdef HAVE_LIBASOUND
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#include <alsa/asoundlib.h>
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#define SS_DEFAULT_FORMAT SND_PCM_FORMAT_U8
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#define SS_DEFAULT_SPEED 8000
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enum _VuMeterInfo {
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VUMETER_NONE,
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VUMETER_MONO,
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VUMETER_STEREO
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};
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struct _SoundParams {
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/* requested options */
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unsigned int rate; /* sampling rate */
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snd_pcm_format_t format; /* stream format */
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char *indexstr; /* string index for card */
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char *device_name; /* ASCII identifier of the PCM handle */
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int firstcard; /* first card number */
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unsigned int input; /* input number on card */
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unsigned int channels;
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char *control_name; /* mixer control name */
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/* length options */
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unsigned int numsamples; /* number of samples per channel to capture */
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double duration; /* durationt is # seconds */
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int start_delay; /* delay for automatic PCM start is # microseconds */
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int stop_delay; /* delay for automatic PCM stop is # microseconds from xrun */
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/* internal options */
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snd_pcm_stream_t stream; /* Wanted stream */
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int open_mode; /* Open mode (see SND_PCM_NONBLOCK, SND_PCM_ASYNC) */
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snd_output_t *fdlog; /* log desc for snd */
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unsigned int buffer_time; /* buffer duration is # microseconds */
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unsigned int period_time ; /* distance between interrupts is # microseconds */
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snd_pcm_uframes_t buffer_frames;
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snd_pcm_uframes_t period_frames;
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int avail_min; /* min available space for wakeup is # microseconds */
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/* internal variables */
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snd_pcm_t *handle;
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snd_pcm_uframes_t chunk_size; /* chunk size in frames */
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size_t chunk_bytes; /* audiobuf size in bytes */
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size_t bits_per_sample; /* bits_per_sample depend on format */
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size_t bits_per_frame; /* bits_per_sample * channels */
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size_t count; /* requested count chunk to read */
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int vumeter;
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u_char *audiobuf; /* the read buffer */
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u_char *bufp; /* pointer on the buffer */
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size_t nleft; /* bytes remaining in buffer */
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};
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int sound_init_soundCard(SoundParams *params);
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int sound_getval_sound(SoundParams *params, double *val);
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int sound_close_soundCard(SoundParams *params);
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snd_mixer_t *sound_open_mixer(char *device_name);
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int sound_mixer_set( char *device_name, char *mixer_control, char *item);
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#else /* HAVE_LIBASOUND */
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struct _SoundParams {
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};
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#endif /* HAVE_LIBASOUND */
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#endif /* SS_SOUND_H */
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