Mike Brady
54cb9de183
Tidy up some error messages about which backend is selected.
Tighten up memory allocatons in DACP.c.
Add a default name for the pipe backend: /tmp/shairport-sync-audio
Ensure the metadata pipe is created, if necessary, when the --with-metadata option is chosen without dbus or mpris
Make the first output backend in the list of backends the default and make its name the default output_name. Clang-format everything
Add the word 'jack' to the version string if Jack Audio support is compiled in.
Fix a flaw in resyncing -- a flush is set up but not triggered.
Open metadata and audio pipes with 666 permissions.
Ensure metadata and cover art are enabled if metadata support is included at compilation.
Reword some misleading error messages.
Set convolution defaults even if no configuration file is found.
62 lines
1.8 KiB
C
62 lines
1.8 KiB
C
#ifndef _AUDIO_H
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#define _AUDIO_H
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#include <libconfig.h>
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#include <stdint.h>
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typedef struct {
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double current_volume_dB;
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int32_t minimum_volume_dB;
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int32_t maximum_volume_dB;
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} audio_parameters;
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typedef struct {
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void (*help)(void);
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char *name;
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// start of program
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int (*init)(int argc, char **argv);
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// at end of program
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void (*deinit)(void);
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int (*prepare)(void); // looks and sets stuff in the config data structure
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void (*start)(int sample_rate, int sample_format);
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// block of samples
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int (*play)(void *buf, int samples);
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void (*stop)(void);
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// may be null if no implemented
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int (*is_running)(
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void); // if implemented, will return 0 if everything is okay, non-zero otherwise
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// may be null if not implemented
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void (*flush)(void);
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// returns the delay before the next frame to be sent to the device would actually be audible.
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// almost certainly wrong if the buffer is empty, so put silent buffers into it to make it busy.
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// will change dynamically, so keep watching it. Implemented in ALSA only.
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// returns a negative error code if there's a problem
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int (*delay)(long *the_delay); // snd_pcm_sframes_t is a signed long
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int (*rate_info)(uint64_t *elapsed_time,
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uint64_t *frames_played); // use this to get the true rate of the DAC
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// may be NULL, in which case soft volume is applied
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void (*volume)(double vol);
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// may be NULL, in which case soft volume parameters are used
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void (*parameters)(audio_parameters *info);
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// may be NULL, in which case software muting is used.
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// also, will return a 1 if it is actually using the mute facility, 0 otherwise
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int (*mute)(int do_mute);
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} audio_output;
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audio_output *audio_get_output(const char *name);
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void audio_ls_outputs(void);
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void parse_general_audio_options(void);
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#endif //_AUDIO_H
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