#include <jni.h>
#include <math.h>
#include <libavcodec/avcodec.h>
#include <libavformat/avformat.h>
#include <libavutil/channel_layout.h>
#include <libavutil/opt.h>
#include <libavutil/timestamp.h>
#include <libswresample/swresample.h>

Data Structures
struct	FFAudioIO
	Central context representing the native peer to the Java FFNativePeerInputStream object. More...

Functions
void	logWarning (FFAudioIO , int, const char )
	Log a warning.
void	logFine (FFAudioIO , int, const char )
	Log a debug message.
void	throwUnsupportedAudioFileExceptionIfError (JNIEnv , int, const char )
	Throws an UnsupportedAudioFileException.
void	throwIOExceptionIfError (JNIEnv , int, const char )
	Throws an IOException.
void	throwIndexOutOfBoundsExceptionIfError (JNIEnv *, int, int)
	Throws an IndexOutOfBoundsException.
void	throwFileNotFoundExceptionIfError (JNIEnv , int, const char )
	Throws a FileNotFoundException.
int	ff_open_stream (JNIEnv , AVStream , AVCodecContext **)
	Opens the given stream, i.e.
int	ff_open_format_context (JNIEnv , AVFormatContext , const char , int)
	Opens the input file/url and allocates a AVFormatContext for it, but does not open the audio stream with an appropriate decoder.
int	ff_open_file (JNIEnv , AVFormatContext , AVStream , AVCodecContext , int , const char *, int)
	Opens the input file/url, allocates a AVFormatContext for it and opens the audio stream with an appropriate decoder.
int	ff_init_audioio (JNIEnv , FFAudioIO )
	Initialize our main context FFAudioIO, so that SwrContext, decode buffers and the encoder are set to reasonable values.
void	ff_audioio_free (FFAudioIO *)
	Free all resources held by aio and then itself.
int	ff_fill_buffer (FFAudioIO *)
	Reads frames via `av_read_frame`, decodes them, and writes the result to the Java-side `nativeBuffer`.
AVCodec *	ff_find_encoder (enum AVSampleFormat, int, int, int)
	Finds an AVCodec encoder for the given sample format, bits per sample, byte order and signed/unsigned encoding.
int	ff_init_encoder (JNIEnv , FFAudioIO , AVCodec *)
	Allocates and initializes the encoder context and frame in FFAudioIO.
int	ff_big_endian (enum AVCodecID)
	Indicates whether the given id belongs to a big endian codec.

Variables
const uint32_t	CODEC_TAG_DRMS

Function Documentation

◆ ff_audioio_free()

void ff_audioio_free ( FFAudioIO * aio )

Free all resources held by aio and then itself.

Definition at line 1169 of file FFUtils.c.

◆ ff_big_endian()

int ff_big_endian ( enum AVCodecID codec_id )

Indicates whether the given id belongs to a big endian codec.

Parameters

codec_id codec id

Returns: true if the codec id belongs to a big endian codec.

Definition at line 1221 of file FFUtils.c.

◆ ff_fill_buffer()

int ff_fill_buffer ( FFAudioIO * aio )

Reads frames via av_read_frame, decodes them, and writes the result to the Java-side nativeBuffer.

Parameters

aio	current FFAudioIO

Returns: a negative number, if something went wrong

Definition at line 1107 of file FFUtils.c.

◆ ff_find_encoder()

AVCodec * ff_find_encoder	(	enum AVSampleFormat	sampleFormat,
		int	bits,
		int	big_endian,
		int	signedSamples )

Finds an AVCodec encoder for the given sample format, bits per sample, byte order and signed/unsigned encoding.

This method never returns a planar, but always a packed codec.

Parameters

sampleFormat	AVSampleFormat
bits	bits per sample
big_endian	true or false
signedSamples	true, if the samples are signed

Returns: an appropriate encoder or NULL, if none can be found

Definition at line 528 of file FFUtils.c.

◆ ff_init_audioio()

int ff_init_audioio	(	JNIEnv *	env,
		FFAudioIO *	aio )

Initialize our main context FFAudioIO, so that SwrContext, decode buffers and the encoder are set to reasonable values.

Parameters

JNIEnv	env
aio	our context, FFAudioIO

Returns: a negative value, if something went wrong

Definition at line 663 of file FFUtils.c.

◆ ff_init_encoder()

int ff_init_encoder	(	JNIEnv *	env,
		FFAudioIO *	aio,
		AVCodec *	encoder )

Allocates and initializes the encoder context and frame in FFAudioIO.

As parameters serve the output parameters of the SwrContext from FFAudioIO. Therefore the SwrContext must be setup first for this to be successful.

Parameters

env	JNIEnv
aio	FFAudioIO (our context)
encoder	AVCodec to use to setup the encoder AVCodecContext

Returns: a negative value, if something goes wrong

Definition at line 591 of file FFUtils.c.

◆ ff_open_file()

int ff_open_file	(	JNIEnv *	env,
		AVFormatContext **	format_context,
		AVStream **	openedStream,
		AVCodecContext **	context,
		int *	stream_index,
		const char *	url,
		int	io_buffer_size )

Opens the input file/url, allocates a AVFormatContext for it and opens the audio stream with an appropriate decoder.

Parameters

env	JNIEnv
format_context	AVFormatContext
openedStream	opened audio AVStream
stream_index[in]	index of the desired audio stream
stream_index[out]	index of the selected stream (index of all streams)
url	URL to open

Returns: negative value, if something went wrong

Definition at line 378 of file FFUtils.c.

◆ ff_open_format_context()

int ff_open_format_context	(	JNIEnv *	env,
		AVFormatContext **	format_context,
		const char *	url,
		int	io_buffer_size )

Opens the input file/url and allocates a AVFormatContext for it, but does not open the audio stream with an appropriate decoder.

Parameters

env	JNIEnv
format_context	AVFormatContext
url	URL to open

Returns: negative value, if something went wrong

Definition at line 297 of file FFUtils.c.

◆ ff_open_stream()

int ff_open_stream	(	JNIEnv *	env,
		AVStream *	stream,
		AVCodecContext **	context )

Opens the given stream, i.e.

sets up a decoder.

Parameters

env	JNIEnv
stream	AVStream

Definition at line 93 of file FFUtils.c.

◆ logFine()

void logFine	(	FFAudioIO *	aio,
		int	err,
		const char *	message )

Log a debug message.

Definition at line 284 of file FFUtils.c.

◆ logWarning()

void logWarning	(	FFAudioIO *	aio,
		int	err,
		const char *	message )

Log a warning.

Definition at line 277 of file FFUtils.c.

◆ throwFileNotFoundExceptionIfError()

void throwFileNotFoundExceptionIfError	(	JNIEnv *	env,
		int	err,
		const char *	message )

Throws a FileNotFoundException.

Definition at line 228 of file FFUtils.c.

◆ throwIndexOutOfBoundsExceptionIfError()

void throwIndexOutOfBoundsExceptionIfError	(	JNIEnv *	env,
		int	err,
		int	index )

Throws an IndexOutOfBoundsException.

Definition at line 199 of file FFUtils.c.

◆ throwIOExceptionIfError()

void throwIOExceptionIfError	(	JNIEnv *	env,
		int	err,
		const char *	message )

Throws an IOException.

Definition at line 213 of file FFUtils.c.

◆ throwUnsupportedAudioFileExceptionIfError()

void throwUnsupportedAudioFileExceptionIfError	(	JNIEnv *	env,
		int	err,
		const char *	message )

Throws an UnsupportedAudioFileException.

Definition at line 182 of file FFUtils.c.

Variable Documentation

◆ CODEC_TAG_DRMS

const uint32_t CODEC_TAG_DRMS

extern

Definition at line 27 of file FFUtils.c.

Data Structures

Functions

Variables

Function Documentation

◆ ff_audioio_free()

◆ ff_big_endian()

◆ ff_fill_buffer()

◆ ff_find_encoder()

◆ ff_init_audioio()

◆ ff_init_encoder()

◆ ff_open_file()

◆ ff_open_format_context()

◆ ff_open_stream()

◆ logFine()

◆ logWarning()

◆ throwFileNotFoundExceptionIfError()

◆ throwIndexOutOfBoundsExceptionIfError()

◆ throwIOExceptionIfError()

◆ throwUnsupportedAudioFileExceptionIfError()

Variable Documentation

◆ CODEC_TAG_DRMS