AudioDecoder Class Reference

Decodes and plays audio streams using FFmpeg and SDL. More...

#include <audio_decoder.h>

Collaboration diagram for AudioDecoder:

Public Member Functions
	AudioDecoder (FFmpegPlayer *player)
	Constructs an AudioDecoder instance.
	~AudioDecoder ()
	Destroys the AudioDecoder instance and cleans up resources.
bool	setup (AVFormatContext *formatContext)
	Sets up the audio decoder with a format context.
void	play ()
	Starts audio playback.
void	stop ()
	Stops audio playback.
void	update ()
	Updates the audio buffer by decoding frames.
bool	decodeAudioFrame ()
	Decodes the next audio frame.
void	fillAudioStream (Uint8 *stream, int len)
	Fills the SDL audio stream buffer with decoded audio.
void	setVolume (float volume)
	Sets the audio volume.
void	setMute (bool mute)
	Toggles the mute state.
void	flush ()
	Flushes the decoder buffers.

Static Public Member Functions
static void	SDLAudioCallback (void *userdata, Uint8 *stream, int len)
	SDL audio callback function.

Friends
class	FFmpegPlayer

Detailed Description

Decodes and plays audio streams using FFmpeg and SDL.

This class manages the decoding of audio streams from an AVFormatContext, resamples audio to a compatible format, and buffers it for playback via SDL audio callbacks. It works with FFmpegPlayer and handles volume and mute settings.

Constructor & Destructor Documentation

AudioDecoder()

AudioDecoder::AudioDecoder

(

FFmpegPlayer *

player

)

Constructs an AudioDecoder instance.

Initializes the decoder with a reference to the parent FFmpegPlayer.

Parameters

player

Pointer to the FFmpegPlayer instance.

~AudioDecoder()

AudioDecoder::~AudioDecoder

(

)

Destroys the AudioDecoder instance and cleans up resources.

Ensures all allocated FFmpeg and SDL resources are properly freed.

Member Function Documentation

decodeAudioFrame()

bool AudioDecoder::decodeAudioFrame

(

)

Decodes the next audio frame.

Attempts to read and decode an audio packet into a frame.

Returns

True if a valid frame was decoded, false otherwise.

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fillAudioStream()

void AudioDecoder::fillAudioStream	(	Uint8 *	stream,
		int	len
	)

Fills the SDL audio stream buffer with decoded audio.

Applies volume and mute settings to the audio data.

Parameters

stream	Pointer to the audio buffer.
len	Length of the audio buffer in bytes.

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flush()

void AudioDecoder::flush

(

)

Flushes the decoder buffers.

Clears any pending frames in the codec context.

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play()

void AudioDecoder::play

(

)

Starts audio playback.

Unpauses the SDL audio device to begin playback.

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SDLAudioCallback()

void AudioDecoder::SDLAudioCallback ( void *  userdata, Uint8 *  stream, int  len  )

static

SDL audio callback function.

Static callback invoked by SDL to fill the audio buffer.

Parameters

userdata	Pointer to the AudioDecoder instance.
stream	Pointer to the audio buffer.
len	Length of the audio buffer in bytes.

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setMute()

void AudioDecoder::setMute

(

bool

mute

)

Toggles the mute state.

Parameters

mute	True to mute, false to unmute.

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setup()

bool AudioDecoder::setup

(

AVFormatContext *

formatContext

)

Sets up the audio decoder with a format context.

Configures the decoder with the audio stream and initializes SDL audio device.

Parameters

formatContext

Pointer to the AVFormatContext containing the audio stream.

Returns

True on successful setup, false otherwise.

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setVolume()

void AudioDecoder::setVolume

(

float

volume

)

Sets the audio volume.

Applies a logarithmic scale to the input volume (0-100) and updates the current volume.

Parameters

volume

Volume level (0-100).

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stop()

void AudioDecoder::stop

(

)

Stops audio playback.

Pauses the SDL audio device and flushes the audio FIFO.

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update()

void AudioDecoder::update

(

)

Updates the audio buffer by decoding frames.

Ensures the audio FIFO has sufficient samples for continuous playback.

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

• src/render/video_players/ffmpeg/audio_decoder.h
• src/render/video_players/ffmpeg/audio_decoder.cpp