audio - Multimedia-Audio#

Adapted Air780E Air780EP Air780EPS

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Tip

This library has its own demo,click this link to view audio’s demo example

Constant#

constant

type

explanation

audio.RESUME

number

PM Mode Working Mode

audio.STANDBY

number

PM Mode standby mode, PA power off, codec standby state, system cannot enter low power consumption state, if PA is not controllable, codec enters silent mode

audio.SHUTDOWN

number

PM Mode shutdown mode, PA power off, configurable codec power off state, unconfigurable codec power off, system can enter low power consumption state

audio.POWEROFF

number

PM Mode power-off mode, PA power-off, codec power-off, system can enter low power consumption state

audio.PCM

number

PCM format, I .e. raw ADC data

audio.MP3

number

MP3 Format

audio.WAV

number

WAV Format

audio.AMR

number

AMR_NB Format

audio.AMR_NB

number

AMR_NB Format

audio.AMR_WB

number

AMR_WB Format

audio.MORE_DATA

number

audio.on The value of the parameter passed in the callback function, indicating that after a piece of data is played at the bottom layer, more data can be passed in.

audio.DONE

number

audio.on The value of the parameter passed in by the callback function indicates that the bottom layer has played all the data.

audio.RECORD_DATA

number

audio.on The value of the parameter passed in the callback function, which represents the recording data.

audio.RECORD_DONE

number

audio.on The value of the parameter passed in the callback function, indicating that the recording is complete.

audio.BUS_DAC

number

Hardware output bus, DAC type

audio.BUS_I2S

number

Hardware output bus, I2S type

audio.BUS_SOFT_DAC

number

Hardware output bus, software mode DAC type

audio.VOLTAGE_1800

number

Configurable codec operating voltage，1.8V

audio.VOLTAGE_3300

number

Configurable codec operating voltage，3.3V

audio.start(id, audio_format, num_channels, sample_rate, bits_per_sample, is_signed)#

Start a multimedia channel ready to play audio

Parameters

Incoming Value Type

Explanation

int

Multimedia playback channel number

int

Audio Format

int

Number of sound channels

int

Sampling frequency

int

Number of sampling bits

boolean

Symbols, default true

Return Value

return value type

explanation

boolean

Success true, failure false

Examples

audio.start(0, audio.PCM, 1, 16000, 16)

audio.record(id, record_type, record_time, amr_quailty, path)#

Recording

Parameters

Incoming Value Type

Explanation

int

id Multimedia playback channel number

int

record_type Recording audio format, supporting audio.AMR audio.PCM (some platforms support audio.AMR_WB)

int

record_time Recording duration in seconds. Optional. The default value is 0.

int

amr_quailty Quality, effective under audio.AMR

string

path The path of the recording file, which is optional. If it is not specified, it will not be saved. The original PCM data can be processed in the audio.on callback function.

int

record_callback_time If the recording file path is not specified, the callback duration of a single recording is 100ms. Default 1, both 100ms

Return Value

return value type

explanation

boolean

Returns true on success, otherwise false

Examples

err,info = audio.record(id, type, record_time, quailty, path)

audio.recordStop(id)#

Recording Stop

Parameters

Incoming Value Type

Explanation

int

id Multimedia playback channel number

Return Value

return value type

explanation

boolean

Returns true on success, otherwise false

Examples

audio.recordStop(0)

audio.write(id, data)#

Write audio data to a multimedia channel

Parameters

Incoming Value Type

Explanation

string

or zbuff Audio Data

Return Value

return value type

explanation

boolean

Returns true on success, otherwise false

Examples

audio.write(0, "xxxxxx")

audio.stop(id)#

Stop the specified multimedia channel

Parameters

Incoming Value Type

Explanation

int

audio id,For example 0

Return Value

return value type

explanation

boolean

Returns true on success, otherwise false

Examples

audio.stop(0)

audio.pause(id, pause)#

Pause/resume specified multimedia channel

Parameters

Incoming Value Type

Explanation

int

audio id,For example 0

boolean

onoff true Pause, false resume

Return Value

return value type

explanation

boolean

Returns true on success, otherwise false

Examples

audio.pause(0, true) --Pause channel 0
audio.pause(0, false) --Recovery channel 0

audio.on(audio_id, func)#

Register audio playback event callback

Parameters

Incoming Value Type

Explanation

int

audio id, audio 0 Write 0, write audio 1 1

function

callback method, the parameters passed in during callback are 1, int channel ID 2, int message value, only audio.MORE_DATA and audio.DONE

Return Value

return value type

explanation

nil

No return value

Examples

audio.on(0, function(audio_id, msg)
    log.info("msg", audio_id, msg)
end)

audio.play(id, path, errStop)#

Play or stop playing a file. After the play is completed, an audio.DONE message will be called back. pause can be used to pause or resume. Other API is not available. Considering the slow speed of reading SD card and slowing down the speed of luavm process, try to use this API

Parameters

Incoming Value Type

Explanation

int

Audio Channel

string/table

The file name. If it is empty, the playback is stopped. If it is table, multiple files are played continuously. It is mainly used for cloud speakers. Currently, only EC618 is supported and errStop parameters are used.

boolean

Indicates whether to stop decoding after a file fails to be decoded. This is only useful when multiple files are played continuously. The default value is true. If a decoding error occurs, the decoding is automatically stopped.

Return Value

return value type

explanation

boolean

Returns true on success, otherwise false

Examples

audio.play(0, "xxxxxx")        --Start playing a file
audio.play(0)                --Stop playing a file

audio.tts(id, data)#

TTS Play or stop

Parameters

Incoming Value Type

Explanation

int

Audio Channel

string/zbuff

Content that needs to be played

Return Value

return value type

explanation

boolean

Returns true on success, otherwise false

Examples

None

audio.playStop(id)#

Stop playing the file, which is the same as audio.play(id).

Parameters

Incoming Value Type

Explanation

int

audio id,For example 0

Return Value

return value type

explanation

boolean

Returns true on success, otherwise false

Examples

audio.playStop(0)

audio.isEnd(id)#

Check whether the current file has finished playing

Parameters

Incoming Value Type

Explanation

int

Audio Channel

Return Value

return value type

explanation

boolean

Returns true on success, otherwise false

Examples

audio.isEnd(0)

audio.getError(id)#

Get the latest playback result. Not all platforms support it. Currently, only EC618 supports it.

Parameters

Incoming Value Type

Explanation

int

Audio Channel

Return Value

return value type

explanation

boolean

Whether all files are played successfully, true successfully, false

boolean

If playback fails, whether the user stops, true is, false is not

int

The first file failed, starting from 1

Examples

local result, user_stop, file_no = audio.getError(0)

audio.config(id, paPin, onLevel, dacDelay, paDelay, dacPin, dacLevel, dacTimeDelay)#

Configure the characteristics of an audio channel, such as automatically controlling the PA switch. Note that this is not necessary. Generally, automatic control is only required when play is called. In other cases, for example, when you manually control the play, you can control the PA switch yourself.

Parameters

Incoming Value Type

Explanation

int

Audio Channel

int

PA Control IO

int

PA Level when on

int

Redundancy time inserted before DAC startup, in 100ms, typically for external DAC

int

How long is the delay in turning on the PA after the DAC is started, unit 1ms

int

The external dac power supply controls IO. If it is not filled in, it means that the platform default IO is used. For example, Air780E uses DACEN pin, air105 is not enabled.

int

When the external dac is turned on, the power control IO level is pulled high by default

int

When audio playback is completed, the time interval between PA and DAC is turned off, in 1ms, default 0ms

Return Value

None

Examples

audio.config(0, pin.PC0, 1)    --PA The control pin is PC0, the high level is turned on, air105 can be used with this configuration
audio.config(0, 25, 1, 6, 200)    --PA The control pin is GPIO25, the high level is turned on, and the Air780E cloud horn board can be used with this configuration.

audio.vol(id, value)#

Configure the volume adjustment of an audio channel to directly enlarge or reduce the original data. Not all platforms support it. It is recommended to use hardware methods to zoom

Parameters

Incoming Value Type

Explanation

int

Audio Channel

int

Volume, percentage, 1% ~ 1000, default 100, is not adjusted

Return Value

return value type

explanation

int

Current Volume

Examples

local result = audio.vol(0, 90)    --The volume of channel 0 is adjusted to 90%,result stores the adjusted volume level, which may still be 100

audio.micVol(id, value)#

configure mic volume adjustment for an audio channel

Parameters

Incoming Value Type

Explanation

int

Audio Channel

int

mic Volume, percentage, 1% ~ 100, default 100, is not adjusted

Return Value

return value type

explanation

int

Current mic volume

Examples

local result = audio.vol(0, 90)    --The volume of channel 0 is adjusted to 90%,result stores the adjusted volume level, which may still be 100

audio.setBus(id, bus_type)#

Configure the hardware output bus of an audio channel, and set the corresponding type only if the corresponding SOC software and hardware platform supports it.

Parameters

Incoming Value Type

Explanation

int

Audio channels, such 0

int

Bus type, such audio.BUS_SOFT_DAC

int

Hardware id, for example, when the bus type is audio.BUS_I2S, the hardware id is i2c id

Return Value

return value type

explanation

nil

No return value

Examples

audio.setBus(0, audio.BUS_SOFT_DAC)    --Hardware output channel for channel 0 is set to software DAC
audio.setBus(0, audio.BUS_I2S)    --The hardware output channel for channel 0 is set I2S

audio.debug(on_off)#

Configuring Debug Information Output

Parameters

Incoming Value Type

Explanation

boolean

true On false off

Return Value

None

Examples

None

audio.pm(id,pm_mode)#

audio Sleep control (usually called automatically without manual execution)

Parameters

Incoming Value Type

Explanation

int

Audio Channel

int

Sleep mode

Return Value

return value type

explanation

boolean

true Success

Examples

audio.pm(multimedia_id,audio.RESUME)