239 line
11 KiB
C
239 line
11 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 cmApBufTest() and cmAudioSysTest().
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// \snippet cmApBuf.c cmApBufExample
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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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// cmApBufGet()
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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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// cmApBufUpdate()
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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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// cmApBufUpdate()
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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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// cmApBufUpdate()
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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 cmApBuf_h
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#define cmApBuf_h
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#ifdef __cplusplus
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extern "C" {
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#endif
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//(
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typedef cmRC_t cmAbRC_t; //< Result code type
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enum
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{
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kOkAbRC = 0
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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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cmAbRC_t cmApBufInitialize( unsigned devCnt, unsigned meterMs );
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// Deallocate and release any resource held by an audio buffer allocated via cmApBufInitialize().
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cmAbRC_t cmApBufFinalize();
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// Configure a buffer for a given device.
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cmAbRC_t cmApBufSetup(
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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 cmApBufGet()
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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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cmAbRC_t cmApBufPrimeOutput( 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 cmApBufOnPortEnable( 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 cmApCallbackPtr_t).
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// This function is thread-safe under the condition where 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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cmAbRC_t cmApBufUpdate(
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cmApAudioPacket_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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cmApAudioPacket_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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);
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// Channel flags
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enum
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{
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kInApFl = 0x01, //< Identify an input channel
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kOutApFl = 0x02, //< Identify an output channel
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kEnableApFl = 0x04, //< Set to enable a channel, Clear to disable.
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kChApFl = 0x08, //< Used to enable/disable a channel
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kMuteApFl = 0x10, //< Mute this channel
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kToneApFl = 0x20, //< Generate a tone on this channel
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kMeterApFl = 0x40, //< Turn meter's on/off
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kPassApFl = 0x80 //< Pass input channels throught to the output. Must use cmApBufGetIO() to implement this functionality.
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};
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// Return the meter window period as set by cmApBufInitialize()
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unsigned cmApBufMeterMs();
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// Set the meter update period. THis function limits the value to between 10 and 1000.
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void cmApBufSetMeterMs( unsigned meterMs );
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// Returns the channel count set via cmApBufSetup().
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unsigned cmApBufChannelCount( 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 {kInApFl | kOutApFl} | {kChApFl | kToneApFl | kMeterFl} | { kEnableApFl=on | 0=off }
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void cmApBufSetFlag( unsigned devIdx, unsigned chIdx, unsigned flags );
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// Return true if the the flags is set.
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bool cmApBufIsFlag( 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 cmApBufEnableChannel( 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 cmApBufIsChannelEnabled(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 {kInApFl | kOutApFl} | { kEnableApFl=on | 0=off }
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void cmApBufEnableTone( 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 cmApBufIsToneEnabled(unsigned devIdx, unsigned chIdx, unsigned flags );
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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 {kInApFl | kOutApFl} | { kEnableApFl=on | 0=off }
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void cmApBufEnableMute( 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 cmApBufIsMuteEnabled(unsigned devIdx, unsigned chIdx, unsigned flags );
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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 {kInApFl | kOutApFl} | { kEnableApFl=on | 0=off }
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void cmApBufEnablePass( 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 cmApBufIsPassEnabled(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 {kInApFl | kOutApFl} | { kEnableApFl=on | 0=off }
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void cmApBufEnableMeter( 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 cmApBufIsMeterEnabled(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 kInApFl | kOutApFl.
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cmApSample_t cmApBufMeter(unsigned devIdx, unsigned chIdx, unsigned flags );
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// Set chIdx to -1 to apply the gain to all channels on the specified device.
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void cmApBufSetGain( 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 cmApBufGain( unsigned devIdx, unsigned chIdx, unsigned flags );
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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 { kInApFl | kOutApFl }.
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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 cmApBufGetStatus( 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 kInApFl and kOutApFl
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bool cmApBufIsDeviceReady( 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 kInApFl or kOutApFl 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 cmApBufSetup() for this device.
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// (see cmApBufInitialize()).
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// Note that this function just returns audio information it does not
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// change any cmApBuf() internal states.
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void cmApBufGet( unsigned devIdx, unsigned flags, cmApSample_t* bufArray[], unsigned bufChCnt );
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// This function replaces calls to cmApBufGet() and implements pass-through and output
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// buffer zeroing:
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//
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// 1) cmApBufGet(in);
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// 2) cmApBufGet(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 cmApBuf() internal states.
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// 4) The timestamp pointers are optional.
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void cmApBufGetIO( unsigned iDevIdx, cmApSample_t* iBufArray[], unsigned iBufChCnt, cmTimeSpec_t* iTimeStampPtr,
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unsigned oDevIdx, cmApSample_t* oBufArray[], unsigned oBufChCnt, cmTimeSpec_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 cmApBufGet(). 'flags' can be set to either or both kInApFl and kOutApFl.
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// This function should only be called from the client thread.
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void cmApBufAdvance( 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 cmApBufGet()
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// and cmApBufAdvance().
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void cmApBufInputToOutput( unsigned inDevIdx, unsigned outDevIdx );
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// Print the current buffer state.
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void cmApBufReport( cmRpt_t* rpt );
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// Run a buffer usage simulation to test the class. cmAudioPortTest.c calls this function.
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void cmApBufTest( cmRpt_t* rpt );
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//)
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#ifdef __cplusplus
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}
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#endif
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#endif
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