Manages the set of A2DPEncoder instances registered via BluetoothA2DPSource::add_encoder(), delegates encode operations to whichever one matches the codec negotiated with the connected sink and packs the encoded frames into A2DP media packets that are sent with esp_a2d_source_audio_data_send(). More...

#include <A2DPEncoder.h>

Inheritance diagram for A2DPAudioEncoder:

Public Member Functions
bool	add_encoder (A2DPEncoder &encoder)

std::vector< A2DPEncoder * > &	all_encoders ()

bool	apply_mcc (const esp_a2d_mcc_t *mcc)

void	close ()
	Closes the active encoder (if any) and drops any unsent data.

audio_tools::AudioInfo	get_audio_info ()
	Negotiated sample rate/channels of the active encoder.

bool	has_encoders ()
	True if at least one encoder has been registered.

bool	is_active ()
	True if an encoder has been selected and opened.

const char *	mime ()
	MIME type of the currently active encoder ("" if none is active)

size_t	process (const uint8_t *pcm, size_t len)

void	reset ()
	Restarts the media packet timestamp and drops any unsent data.

int	sample_rate ()

void	set_connection_handle (esp_a2d_conn_hdl_t hdl)
	Defines the connection handle used for sending.

void	set_mtu (uint16_t mtu)
	Defines the MTU of the audio connection.

void	write_frame (const uint8_t *data, size_t len, uint32_t samples) override

Protected Member Functions
A2DPEncoder *	find (esp_a2d_mct_t type)

void	free_pending ()

uint16_t	max_payload ()
	max payload of a media packet

void	send_pending ()
	sends the pending media packet

Protected Attributes
A2DPEncoder *	active = nullptr

esp_a2d_conn_hdl_t	conn_hdl = 0

std::vector< A2DPEncoder * >	encoders

bool	is_mtu_warning_logged = false

uint16_t	mtu = 0

esp_a2d_audio_buff_t *	pending = nullptr

uint32_t	timestamp = 0

Detailed Description

Manages the set of A2DPEncoder instances registered via BluetoothA2DPSource::add_encoder(), delegates encode operations to whichever one matches the codec negotiated with the connected sink and packs the encoded frames into A2DP media packets that are sent with esp_a2d_source_audio_data_send().

Author: Phil Schatzmann

Copyright: Apache License Version 2

Member Function Documentation

◆ add_encoder()

bool A2DPAudioEncoder::add_encoder ( A2DPEncoder & encoder )

Registers an encoder for its codec_type(); returns false if an encoder for that codec type is already registered

◆ all_encoders()

std::vector< A2DPEncoder * > & A2DPAudioEncoder::all_encoders ( )

inline

All registered encoders, in registration order - used to drive SEP registration (one stream endpoint per entry)

◆ apply_mcc()

bool A2DPAudioEncoder::apply_mcc ( const esp_a2d_mcc_t * mcc )

Selects and opens the encoder matching mcc->type. Returns false if no matching encoder is registered or it failed to open.

◆ process()

size_t A2DPAudioEncoder::process	(	const uint8_t *	pcm,
		size_t	len
	)

Encodes 16 bit stereo PCM with the active encoder (no-op if none is active) and sends the resulting media packets

◆ sample_rate()

int A2DPAudioEncoder::sample_rate ( )

Sample rate of the PCM expected by the active (or else first registered) encoder

◆ write_frame()

void A2DPAudioEncoder::write_frame	(	const uint8_t *	data,
		size_t	len,
		uint32_t	samples
	)

overridevirtual

one complete encoded frame covering the indicated number of samples (per channel)

Implements A2DPFrameSink.

The documentation for this class was generated from the following files:

src/A2DPEncoder.h
src/A2DPEncoder.cpp

Public Member Functions

Protected Member Functions

Protected Attributes