248 lines
12 KiB
C++
248 lines
12 KiB
C++
//( {file_desc: "Thread safe audio buffer class." kw:[rt audio]}
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//
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// This file defines an audio buffer class which handles
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// buffering incoming (recording) and outgoing (playback)
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// samples in a thread-safe manner.
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//
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// Usage example and testing code:
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// See audio::device::test()
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// \snippet cwAudioBuf.c cwAudioBufExample
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//
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// Notes on channel flags:
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// Disabled channels: kChFl is cleared
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// get()
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// in - return NULL buffer pointers
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// out - return NULL buffer points
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//
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// update()
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// in - incoming samples are set to 0.
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// out - outgoing samples are set to 0.
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//
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// Muted channels: kMuteFl is set
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// update()
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// in - incoming samples are set to 0.
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// out - outgoing samples are set to 0.
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//
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// Tone channels: kToneFl is set
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// update()
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// in - incoming samples are filled with a 1k sine tone
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// out - outgoing samples are filled with a 1k sine tone
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//)
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#ifndef cwAudioBuf_H
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#define cwAudioBuf_H
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#include "cwAudioBufDecls.h"
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namespace cw
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{
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namespace audio
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{
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namespace buf
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{
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//(
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typedef device::sample_t sample_t;
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typedef handle<struct audioBuf_str> handle_t;
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// Channel flags
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enum
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{
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kInFl = 0x01, //< Identify an input channel
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kOutFl = 0x02, //< Identify an output channel
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kEnableFl = 0x04, //< Set to enable a channel, Clear to disable.
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kChFl = 0x08, //< Used to enable/disable a channel
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kMuteFl = 0x10, //< Mute this channel
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kToneFl = 0x20, //< Generate a tone on this channel
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kMeterFl = 0x40, //< Turn meter's on/off
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kPassFl = 0x80 //< Pass input channels throught to the output. Must use getIO() to implement this functionality.
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};
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// Allocate and initialize an audio buffer.
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// devCnt - count of devices this buffer will handle.
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// meterMs - length of the meter buffers in milliseconds (automatically limit to the range:10 to 1000)
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rc_t create( handle_t& hRef, unsigned devCnt, unsigned meterMs );
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// Deallocate and release any resource held by an audio buffer allocated via initialize().
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rc_t destroy( handle_t& hRef );
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// Configure a buffer for a given device.
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rc_t setup(
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handle_t h,
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unsigned devIdx, //< device to setup
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double srate, //< device sample rate (only required for synthesizing the correct test-tone frequency)
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unsigned dspFrameCnt, //< dspFrameCnt - count of samples in channel buffers returned via get()
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unsigned cycleCnt, //< number of audio port cycles to store
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unsigned inChCnt, //< input channel count on this device
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unsigned inFramesPerCycle, //< maximum number of incoming sample frames on an audio port cycle
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unsigned outChCnt, //< output channel count on this device
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unsigned outFramesPerCycle //< maximum number of outgoing sample frames in an audio port cycle
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);
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// Prime the buffer with 'audioCycleCnt' * outFramesPerCycle samples ready to be played
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rc_t primeOutput( handle_t h, unsigned devIdx, unsigned audioCycleCnt );
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// Notify the audio buffer that a device is being enabled or disabled.
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void onPortEnable( handle_t h, unsigned devIdx, bool enabelFl );
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// This function is called asynchronously by the audio device driver to transfer incoming samples to the
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// the buffer and to send outgoing samples to the DAC. This function is
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// intended to be called from the audio port callback function (\see auido::device::cbFunc_t).
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// This function is thread-safe under the condition that the audio device uses
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// different threads for input and output.
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//
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// Enable Flag:
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// Input: If an input channel is disabled then the incoming samples are replaced with zeros.
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// Output: If an output channel is disabled then the packet samples are set to zeros.
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//
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// Tone Flag:
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// Input: If the tone flag is set on an input channel then the incoming samples are set to a sine tone.
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// Output: If the tone flag is set on an output channel then the packet samples are set to a sine tone.
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//
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// The enable flag has higher precedence than the tone flag therefore disabled channels
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// will be set to zero even if the tone flag is set.
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rc_t update(
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handle_t h,
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device::audioPacket_t* inPktArray, //< full audio packets from incoming audio (from ADC)
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unsigned inPktCnt, //< count of incoming audio packets
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device::audioPacket_t* outPktArray, //< empty audio packet for outgoing audio (to DAC)
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unsigned outPktCnt); //< count of outgoing audio packets
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// Return the meter window period as set by initialize()
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unsigned meterMs(handle_t h);
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// Set the meter update period. This function limits the value to between 10 and 1000.
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void setMeterMs( handle_t h, unsigned meterMs );
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// Returns the channel count set via setup().
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unsigned channelCount( handle_t h, unsigned devIdx, unsigned flags );
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// Set chIdx to -1 to enable all channels on this device.
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// Set flags to kInFl | kOutFl | {kChFl | kToneFl | kMeterFl} | { kEnableFl=on | 0=off }
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void setFlag( handle_t h, unsigned devIdx, unsigned chIdx, unsigned flags );
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// Return true if the the flags is set.
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bool isFlag( handle_t h, unsigned devIdx, unsigned chIdx, unsigned flags );
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// Set chIdx to -1 to enable all channels on this device.
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void enableChannel( handle_t h, unsigned devIdx, unsigned chIdx, unsigned flags );
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// Returns true if an input/output channel is enabled on the specified device.
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bool isChannelEnabled(handle_t h, unsigned devIdx, unsigned chIdx, unsigned flags );
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// Set the state of the tone generator on the specified channel.
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// Set chIdx to -1 to apply the change to all channels on this device.
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// Set flags to {kInFl | kOutFl} | { kEnableFl=on | 0=off }
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void enableTone( handle_t h, unsigned devIdx, unsigned chIdx, unsigned flags );
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// Returns true if an input/output tone is enabled on the specified device.
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bool isToneEnabled(handle_t h, unsigned devIdx, unsigned chIdx, unsigned flags );
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void toneFlags( handle_t h, unsigned devIdx, unsigned flags, bool* enableFlA, unsigned enableFlN );
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// Mute a specified channel.
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// Set chIdx to -1 to apply the change to all channels on this device.
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// Set flags to {kInFl | kOutFl} | { kEnableFl=on | 0=off }
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void enableMute( handle_t h, unsigned devIdx, unsigned chIdx, unsigned flags );
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// Returns true if an input/output channel is muted on the specified device.
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bool isMuteEnabled(handle_t h, unsigned devIdx, unsigned chIdx, unsigned flags );
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void muteFlags( handle_t h, unsigned devIdx, unsigned flags, bool* muteFlA, unsigned muteFlN );
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// Set the specified channel to pass through.
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// Set chIdx to -1 to apply the change to all channels on this device.
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// Set flags to {kInFl | kOutFl} | { kEnableFl=on | 0=off }
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void enablePass( handle_t h, unsigned devIdx, unsigned chIdx, unsigned flags );
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// Returns true if pass through is enabled on the specified channel.
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bool isPassEnabled(handle_t h, unsigned devIdx, unsigned chIdx, unsigned flags );
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// Turn meter data collection on and off.
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// Set chIdx to -1 to apply the change to all channels on this device.
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// Set flags to {kInFl | kOutFl} | { kEnableFl=on | 0=off }
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void enableMeter( handle_t h, unsigned devIdx, unsigned chIdx, unsigned flags );
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// Returns true if an input/output tone is enabled on the specified device.
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bool isMeterEnabled(handle_t h, unsigned devIdx, unsigned chIdx, unsigned flags );
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// Return the meter value for the requested channel.
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// Set flags to kInFl | kOutFl.
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sample_t meter(handle_t h, unsigned devIdx, unsigned chIdx, unsigned flags );
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void meter(handle_t h, unsigned devIdx, unsigned flags, sample_t* meterA, unsigned meterN );
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// Set chIdx to -1 to apply the gain to all channels on the specified device.
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void setGain( handle_t h, unsigned devIdx, unsigned chIdx, unsigned flags, double gain );
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// Return the current gain seting for the specified channel.
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double gain( handle_t h, unsigned devIdx, unsigned chIdx, unsigned flags );
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void gain( handle_t h, unsigned devIdx, unsigned flags, double* gainA, unsigned gainN );
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// Get the meter and fault status of the channel input or output channel array of a device.
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// Set 'flags' to { kInFl | kOutFl }.
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// The returns value is the count of channels actually written to meterArray.
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// If 'faultCntPtr' is non-NULL then it is set to the faultCnt of the associated devices input or output buffer.
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unsigned getStatus( handle_t h, unsigned devIdx, unsigned flags, double* meterArray, unsigned meterCnt, unsigned* faultCntPtr );
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// Do all enabled input/output channels on this device have samples available?
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// 'flags' can be set to either or both kInFl and kOutFl
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bool isDeviceReady( handle_t h, unsigned devIdx, unsigned flags );
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// This function is called by the application to get full incoming sample buffers and
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// to fill empty outgoing sample buffers.
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// Upon return each element in bufArray[bufChCnt] holds a pointer to a buffer assoicated
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// with an audio channel or to NULL if the channel is disabled.
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// 'flags' can be set to kInFl or kOutFl but not both.
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// The buffers pointed to by bufArray[] each contain 'dspFrameCnt' samples. Where
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// 'dspFrameCnt' was set in the earlier call to setup() for this device.
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// (see initialize()).
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// Note that this function just returns audio information it does not
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// change any internal states.
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void get( handle_t h, unsigned devIdx, unsigned flags, sample_t* bufArray[], unsigned bufChCnt );
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// This function replaces calls to get() and implements pass-through and output
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// buffer zeroing:
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//
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// 1) get(in);
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// 2) get(out);
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// 3) Copy through channels marked for 'pass' and set the associated oBufArray[i] channel to NULL.
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// 4) Zero all other enabled output channels.
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//
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// Notes:
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// 1) The oBufArray[] channels that are disabled or marked for pass-through will
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// be set to NULL.
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// 2) The client is required to use this function to implement pass-through internally.
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// 3) This function just returns audio information it does not
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// change any internal states.
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// 4) The timestamp pointers are optional.
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void getIO( handle_t h,
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unsigned iDevIdx, sample_t* iBufArray[], unsigned iBufChCnt, time::spec_t* iTimeStampPtr,
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unsigned oDevIdx, sample_t* oBufArray[], unsigned oBufChCnt, time::spec_t* oTimeStampPtr );
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// The application calls this function each time it completes processing of a bufArray[]
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// returned from get(). 'flags' can be set to either or both kInFl and kOutFl.
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// This function should only be called from the client thread.
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void advance( handle_t h, unsigned devIdx, unsigned flags );
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// Copy all available samples incoming samples from an input device to an output device.
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// The source code for this example is a good example of how an application should use get()
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// and advance().
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void inputToOutput( handle_t h, unsigned inDevIdx, unsigned outDevIdx );
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// Print the current buffer state.
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void report( handle_t h );
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// Run a buffer usage simulation to test the class. cmAudioPortTest.c calls this function.
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rc_t test(const test::test_args_t& args);
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//)
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}
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}
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}
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#endif
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