#include "config_components.h"
#include "avcodec.h"
#include "codec_internal.h"
#include "encode.h"
#include "put_bits.h"
#include "audio_frame_queue.h"
#include "libavutil/channel_layout.h"
#include "libavutil/crc.h"
#include "libavutil/avstring.h"
#include "libavutil/intmath.h"
#include "libavutil/samplefmt.h"
#include "libavutil/thread.h"
#include "mlp.h"
#include "lpc.h"

Data Structures
struct	RestartHeader

struct	MatrixParams

struct	DecodingParams

struct	BestOffset

struct	MLPEncodeContext

struct	PathCounter

Macros
#define	MAJOR_HEADER_INTERVAL 16
	MLP encoder Copyright (c) 2008 Ramiro Polla Copyright (c) 2016-2019 Jai Luthra. More...

#define	MLP_MIN_LPC_ORDER 1

#define	MLP_MAX_LPC_ORDER 8

#define	MLP_MIN_LPC_SHIFT 8

#define	MLP_MAX_LPC_SHIFT 15

#define	HUFF_OFFSET_MIN (-16384)

#define	HUFF_OFFSET_MAX ( 16383)

#define	NUM_CODEBOOKS 4
	Number of possible codebooks (counting "no codebooks") More...

#define	SYNC_MAJOR 0xf8726f

#define	MAJOR_SYNC_INFO_SIGNATURE 0xB752

#define	FLAGS_DVDA 0x4000

#define	FLAGS_CONST 0x8000

#define	SUBSTREAM_INFO_MAX_2_CHAN 0x01

#define	SUBSTREAM_INFO_HIGH_RATE 0x02

#define	SUBSTREAM_INFO_ALWAYS_SET 0x04

#define	SUBSTREAM_INFO_2_SUBSTREAMS 0x08

#define	SAMPLE_MAX(bitdepth) ((1 << (bitdepth - 1)) - 1)

#define	SAMPLE_MIN(bitdepth) (~SAMPLE_MAX(bitdepth))

#define	MSB_MASK(bits) (-(int)(1u << (bits)))

#define	CODEBOOK_CHANGE_BITS 21

Enumerations
enum	ParamFlags { PARAMS_DEFAULT = 0xff, PARAM_PRESENCE_FLAGS = 1 << 8, PARAM_BLOCKSIZE = 1 << 7, PARAM_MATRIX = 1 << 6, PARAM_OUTSHIFT = 1 << 5, PARAM_QUANTSTEP = 1 << 4, PARAM_FIR = 1 << 3, PARAM_IIR = 1 << 2, PARAM_HUFFOFFSET = 1 << 1, PARAM_PRESENT = 1 << 0 }

enum	InputBitDepth { BITS_16, BITS_20, BITS_24 }

enum	MLPChMode { MLP_CHMODE_LEFT_RIGHT, MLP_CHMODE_LEFT_SIDE, MLP_CHMODE_RIGHT_SIDE, MLP_CHMODE_MID_SIDE }

Functions
static int	compare_filter_params (const ChannelParams prev_cp, const ChannelParams cp, int filter)
	Compares two FilterParams structures and returns 1 if anything has changed. More...

static int	compare_matrix_params (MLPEncodeContext ctx, const MatrixParams prev, const MatrixParams *mp)
	Compare two primitive matrices and returns 1 if anything has changed. More...

static int	compare_decoding_params (MLPEncodeContext *ctx)
	Compares two DecodingParams and ChannelParams structures to decide if a new decoding params header has to be written. More...

static void	copy_filter_params (ChannelParams dst_cp, ChannelParams src_cp, int filter)

static void	copy_matrix_params (MatrixParams dst, MatrixParams src)

static void	copy_restart_frame_params (MLPEncodeContext *ctx)

static void	clear_decoding_params (DecodingParams *decoding_params)
	Clears a DecodingParams struct the way it should be after a restart header. More...

static void	clear_channel_params (ChannelParams channel_params[MAX_CHANNELS], int nb_channels)
	Clears a ChannelParams struct the way it should be after a restart header. More...

static void	default_decoding_params (MLPEncodeContext ctx, DecodingParams decoding_params)
	Sets default vales in our encoder for a DecodingParams struct. More...

static int	number_sbits (int number)
	Calculates the smallest number of bits it takes to encode a given signed value in two's complement. More...

static int	mlp_peak_bitrate (int peak_bitrate, int sample_rate)

static av_cold void	mlp_encode_init_static (void)

static av_cold int	mlp_encode_init (AVCodecContext *avctx)

static void	write_major_sync (MLPEncodeContext ctx, uint8_t buf, int buf_size)
	Writes a major sync header to the bitstream. More...

static void	write_restart_header (MLPEncodeContext ctx, PutBitContext pb)
	Writes a restart header to the bitstream. More...

static void	write_matrix_params (MLPEncodeContext ctx, PutBitContext pb)
	Writes matrix params for all primitive matrices to the bitstream. More...

static void	write_filter_params (MLPEncodeContext ctx, PutBitContext pb, unsigned int channel, unsigned int filter)
	Writes filter parameters for one filter to the bitstream. More...

static void	write_decoding_params (MLPEncodeContext ctx, PutBitContext pb, int params_changed)
	Writes decoding parameters to the bitstream. More...

static void	write_block_data (MLPEncodeContext ctx, PutBitContext pb)
	Writes the residuals to the bitstream. More...

static uint8_t *	write_substr (MLPEncodeContext ctx, uint8_t buf, int buf_size, int restart_frame, uint16_t substream_data_len[MAX_SUBSTREAMS])
	Writes the substream data to the bitstream. More...

static void	write_frame_headers (MLPEncodeContext ctx, uint8_t frame_header, uint8_t *substream_headers, unsigned int length, int restart_frame, uint16_t substream_data_len[1])
	Writes the access unit and substream headers to the bitstream. More...

static int	write_access_unit (MLPEncodeContext ctx, uint8_t buf, int buf_size, int restart_frame)
	Writes an entire access unit to the bitstream. More...

static void	input_data_internal (MLPEncodeContext ctx, const uint8_t samples, int nb_samples, int is24)
	Inputs data from the samples passed by lavc into the context, shifts them appropriately depending on the bit-depth, and calculates the lossless_check_data that will be written to the restart header. More...

static void	input_data (MLPEncodeContext ctx, void samples, int nb_samples)
	Wrapper function for inputting data in two different bit-depths. More...

static void	input_to_sample_buffer (MLPEncodeContext *ctx)

static int	number_trailing_zeroes (int32_t sample)
	Counts the number of trailing zeroes in a value. More...

static void	determine_quant_step_size (MLPEncodeContext *ctx)
	Determines how many bits are zero at the end of all samples so they can be shifted out. More...

static void	code_filter_coeffs (MLPEncodeContext ctx, FilterParams fp, int32_t *fcoeff)
	Determines the smallest number of bits needed to encode the filter coefficients, and if it's possible to right-shift their values without losing any precision. More...

static void	set_filter_params (MLPEncodeContext *ctx, unsigned int channel, unsigned int filter, int clear_filter)
	Determines the best filter parameters for the given data and writes the necessary information to the context. More...

static void	determine_filters (MLPEncodeContext *ctx)
	Tries to determine a good prediction filter, and applies it to the samples buffer if the filter is good enough. More...

static enum MLPChMode	estimate_stereo_mode (MLPEncodeContext *ctx)

static void	code_matrix_coeffs (MLPEncodeContext *ctx, unsigned int mat)
	Determines how many fractional bits are needed to encode matrix coefficients. More...

static void	lossless_matrix_coeffs (MLPEncodeContext *ctx)
	Determines best coefficients to use for the lossless matrix. More...

static void	no_codebook_bits_offset (MLPEncodeContext ctx, unsigned int channel, int16_t offset, int32_t min, int32_t max, BestOffset bo)
	Determines the amount of bits needed to encode the samples using no codebooks and a specified offset. More...

static void	no_codebook_bits (MLPEncodeContext ctx, unsigned int channel, int32_t min, int32_t max, BestOffset bo)
	Determines the least amount of bits needed to encode the samples using no codebooks. More...

static void	codebook_bits_offset (MLPEncodeContext ctx, unsigned int channel, int codebook, int32_t sample_min, int32_t sample_max, int16_t offset, BestOffset bo)
	Determines the least amount of bits needed to encode the samples using a given codebook and a given offset. More...

static void	codebook_bits (MLPEncodeContext ctx, unsigned int channel, int codebook, int offset, int32_t min, int32_t max, BestOffset bo, int direction)
	Determines the least amount of bits needed to encode the samples using a given codebook. More...

static void	determine_bits (MLPEncodeContext *ctx)
	Determines the least amount of bits needed to encode the samples using any or no codebook. More...

static int	apply_filter (MLPEncodeContext *ctx, unsigned int channel)
	Applies the filter to the current samples, and saves the residual back into the samples buffer. More...

static void	apply_filters (MLPEncodeContext *ctx)

static void	generate_2_noise_channels (MLPEncodeContext *ctx)
	Generates two noise channels worth of data. More...

static void	rematrix_channels (MLPEncodeContext *ctx)
	Rematrixes all channels using chosen coefficients. More...

static void	clear_path_counter (PathCounter *path_counter)

static int	compare_best_offset (const BestOffset prev, const BestOffset cur)

static int	best_codebook_path_cost (MLPEncodeContext ctx, unsigned int channel, PathCounter src, int cur_codebook)

static void	set_best_codebook (MLPEncodeContext *ctx)

static void	set_major_params (MLPEncodeContext *ctx)
	Analyzes all collected bitcounts and selects the best parameters for each individual access unit. More...

static void	analyze_sample_buffer (MLPEncodeContext *ctx)

static void	process_major_frame (MLPEncodeContext *ctx)

static int	mlp_encode_frame (AVCodecContext avctx, AVPacket avpkt, const AVFrame frame, int got_packet)

static av_cold int	mlp_encode_close (AVCodecContext *avctx)

Variables
static ChannelParams	restart_channel_params [MAX_CHANNELS]

static DecodingParams	restart_decoding_params [MAX_SUBSTREAMS]

static const BestOffset	restart_best_offset [NUM_CODEBOOKS] = {{0}}

static const int	codebook_extremes [3][2]
	Min and max values that can be encoded with each codebook. More...

Macro Definition Documentation

◆ MAJOR_HEADER_INTERVAL

#define MAJOR_HEADER_INTERVAL 16

This file is part of FFmpeg.

FFmpeg is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version.

FFmpeg is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public License along with FFmpeg; if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

Definition at line 39 of file mlpenc.c.

◆ MLP_MIN_LPC_ORDER

#define MLP_MIN_LPC_ORDER 1

Definition at line 41 of file mlpenc.c.

◆ MLP_MAX_LPC_ORDER

#define MLP_MAX_LPC_ORDER 8

Definition at line 42 of file mlpenc.c.

◆ MLP_MIN_LPC_SHIFT

#define MLP_MIN_LPC_SHIFT 8

Definition at line 43 of file mlpenc.c.

◆ MLP_MAX_LPC_SHIFT

#define MLP_MAX_LPC_SHIFT 15

Definition at line 44 of file mlpenc.c.

◆ HUFF_OFFSET_MIN

#define HUFF_OFFSET_MIN (-16384)

Definition at line 103 of file mlpenc.c.

◆ HUFF_OFFSET_MAX

#define HUFF_OFFSET_MAX ( 16383)

Definition at line 104 of file mlpenc.c.

◆ NUM_CODEBOOKS

#define NUM_CODEBOOKS 4

Number of possible codebooks (counting "no codebooks")

Definition at line 107 of file mlpenc.c.

◆ SYNC_MAJOR

#define SYNC_MAJOR 0xf8726f

Definition at line 216 of file mlpenc.c.

◆ MAJOR_SYNC_INFO_SIGNATURE

#define MAJOR_SYNC_INFO_SIGNATURE 0xB752

Definition at line 217 of file mlpenc.c.

◆ FLAGS_DVDA

#define FLAGS_DVDA 0x4000

Definition at line 220 of file mlpenc.c.

◆ FLAGS_CONST

#define FLAGS_CONST 0x8000

Definition at line 222 of file mlpenc.c.

◆ SUBSTREAM_INFO_MAX_2_CHAN

#define SUBSTREAM_INFO_MAX_2_CHAN 0x01

Definition at line 224 of file mlpenc.c.

◆ SUBSTREAM_INFO_HIGH_RATE

#define SUBSTREAM_INFO_HIGH_RATE 0x02

Definition at line 225 of file mlpenc.c.

◆ SUBSTREAM_INFO_ALWAYS_SET

#define SUBSTREAM_INFO_ALWAYS_SET 0x04

Definition at line 226 of file mlpenc.c.

◆ SUBSTREAM_INFO_2_SUBSTREAMS

#define SUBSTREAM_INFO_2_SUBSTREAMS 0x08

Definition at line 227 of file mlpenc.c.

◆ SAMPLE_MAX

#define SAMPLE_MAX ( bitdepth ) ((1 << (bitdepth - 1)) - 1)

Definition at line 1706 of file mlpenc.c.

◆ SAMPLE_MIN

#define SAMPLE_MIN ( bitdepth ) (~SAMPLE_MAX(bitdepth))

Definition at line 1707 of file mlpenc.c.

◆ MSB_MASK

#define MSB_MASK ( bits ) (-(int)(1u << (bits)))

Definition at line 1709 of file mlpenc.c.

◆ CODEBOOK_CHANGE_BITS

#define CODEBOOK_CHANGE_BITS 21

Definition at line 1842 of file mlpenc.c.

Enumeration Type Documentation

◆ ParamFlags

enum ParamFlags

Enumerator
PARAMS_DEFAULT
PARAM_PRESENCE_FLAGS
PARAM_BLOCKSIZE
PARAM_MATRIX
PARAM_OUTSHIFT
PARAM_QUANTSTEP
PARAM_FIR
PARAM_IIR
PARAM_HUFFOFFSET
PARAM_PRESENT

Definition at line 73 of file mlpenc.c.

◆ InputBitDepth

enum InputBitDepth

Enumerator
BITS_16
BITS_20
BITS_24

Definition at line 459 of file mlpenc.c.

◆ MLPChMode

enum MLPChMode

Enumerator
MLP_CHMODE_LEFT_RIGHT
MLP_CHMODE_LEFT_SIDE
MLP_CHMODE_RIGHT_SIDE
MLP_CHMODE_MID_SIDE

Definition at line 1358 of file mlpenc.c.

Function Documentation

◆ compare_filter_params()

static int compare_filter_params	(	const ChannelParams *	prev_cp,
		const ChannelParams *	cp,
		int	filter
	)

static

Compares two FilterParams structures and returns 1 if anything has changed.

Returns 0 if they are both equal.

Definition at line 236 of file mlpenc.c.

Referenced by compare_decoding_params().

◆ compare_matrix_params()

static int compare_matrix_params	(	MLPEncodeContext *	ctx,
		const MatrixParams *	prev,
		const MatrixParams *	mp
	)

static

Compare two primitive matrices and returns 1 if anything has changed.

Returns 0 if they are both equal.

Definition at line 260 of file mlpenc.c.

Referenced by compare_decoding_params().

◆ compare_decoding_params()

static int compare_decoding_params ( MLPEncodeContext * ctx )

static

Compares two DecodingParams and ChannelParams structures to decide if a new decoding params header has to be written.

Definition at line 289 of file mlpenc.c.

Referenced by set_major_params().

◆ copy_filter_params()

static void copy_filter_params	(	ChannelParams *	dst_cp,
		ChannelParams *	src_cp,
		int	filter
	)

static

Definition at line 342 of file mlpenc.c.

Referenced by copy_restart_frame_params().

◆ copy_matrix_params()

static void copy_matrix_params	(	MatrixParams *	dst,
		MatrixParams *	src
	)

static

Definition at line 360 of file mlpenc.c.

Referenced by copy_restart_frame_params().

◆ copy_restart_frame_params()

static void copy_restart_frame_params ( MLPEncodeContext * ctx )

static

Definition at line 379 of file mlpenc.c.

Referenced by analyze_sample_buffer().

◆ clear_decoding_params()

static void clear_decoding_params ( DecodingParams * decoding_params )

static

Clears a DecodingParams struct the way it should be after a restart header.

Definition at line 400 of file mlpenc.c.

Referenced by default_decoding_params(), and mlp_encode_init_static().

◆ clear_channel_params()

static void clear_channel_params	(	ChannelParams	channel_params[MAX_CHANNELS],
		int	nb_channels
	)

static

Clears a ChannelParams struct the way it should be after a restart header.

Definition at line 412 of file mlpenc.c.

Referenced by mlp_encode_frame(), and mlp_encode_init_static().

◆ default_decoding_params()

static void default_decoding_params	(	MLPEncodeContext *	ctx,
		DecodingParams *	decoding_params
	)

static

Sets default vales in our encoder for a DecodingParams struct.

Definition at line 427 of file mlpenc.c.

Referenced by mlp_encode_frame().

◆ number_sbits()

static int number_sbits ( int number )

inlinestatic

Calculates the smallest number of bits it takes to encode a given signed value in two's complement.

Definition at line 451 of file mlpenc.c.

Referenced by code_filter_coeffs(), input_data_internal(), no_codebook_bits(), and no_codebook_bits_offset().

◆ mlp_peak_bitrate()

static int mlp_peak_bitrate	(	int	peak_bitrate,
		int	sample_rate
	)

static

Definition at line 465 of file mlpenc.c.

Referenced by mlp_encode_init().

◆ mlp_encode_init_static()

static av_cold void mlp_encode_init_static ( void )

static

Definition at line 470 of file mlpenc.c.

Referenced by mlp_encode_init().

◆ mlp_encode_init()

static av_cold int mlp_encode_init ( AVCodecContext * avctx )

static

Definition at line 477 of file mlpenc.c.

◆ write_major_sync()

static void write_major_sync	(	MLPEncodeContext *	ctx,
		uint8_t *	buf,
		int	buf_size
	)

static

Writes a major sync header to the bitstream.

Definition at line 700 of file mlpenc.c.

Referenced by write_access_unit().

◆ write_restart_header()

static void write_restart_header	(	MLPEncodeContext *	ctx,
		PutBitContext *	pb
	)

static

Writes a restart header to the bitstream.

Damaged streams can start being decoded losslessly again after such a header and the subsequent decoding params header.

Definition at line 759 of file mlpenc.c.

Referenced by write_substr().

◆ write_matrix_params()

static void write_matrix_params	(	MLPEncodeContext *	ctx,
		PutBitContext *	pb
	)

static

Writes matrix params for all primitive matrices to the bitstream.

Definition at line 795 of file mlpenc.c.

Referenced by write_decoding_params().

◆ write_filter_params()

static void write_filter_params	(	MLPEncodeContext *	ctx,
		PutBitContext *	pb,
		unsigned int	channel,
		unsigned int	filter
	)

static

Writes filter parameters for one filter to the bitstream.

Definition at line 824 of file mlpenc.c.

Referenced by write_decoding_params().

◆ write_decoding_params()

static void write_decoding_params	(	MLPEncodeContext *	ctx,
		PutBitContext *	pb,
		int	params_changed
	)

static

Writes decoding parameters to the bitstream.

These change very often, usually at almost every frame.

Definition at line 850 of file mlpenc.c.

Referenced by write_substr().

◆ write_block_data()

static void write_block_data	(	MLPEncodeContext *	ctx,
		PutBitContext *	pb
	)

static

Writes the residuals to the bitstream.

That is, the VLC codes from the codebooks (if any is used), and then the residual.

Definition at line 950 of file mlpenc.c.

Referenced by write_substr().

◆ write_substr()

static uint8_t* write_substr	(	MLPEncodeContext *	ctx,
		uint8_t *	buf,
		int	buf_size,
		int	restart_frame,
		uint16_t	substream_data_len[MAX_SUBSTREAMS]
	)

static

Writes the substream data to the bitstream.

Definition at line 997 of file mlpenc.c.

Referenced by write_access_unit().

◆ write_frame_headers()

static void write_frame_headers	(	MLPEncodeContext *	ctx,
		uint8_t *	frame_header,
		uint8_t *	substream_headers,
		unsigned int	length,
		int	restart_frame,
		uint16_t	substream_data_len[1]
	)

static

Writes the access unit and substream headers to the bitstream.

Definition at line 1087 of file mlpenc.c.

Referenced by write_access_unit().

◆ write_access_unit()

static int write_access_unit	(	MLPEncodeContext *	ctx,
		uint8_t *	buf,
		int	buf_size,
		int	restart_frame
	)

static

Writes an entire access unit to the bitstream.

Definition at line 1125 of file mlpenc.c.

Referenced by mlp_encode_frame().

◆ input_data_internal()

static void input_data_internal	(	MLPEncodeContext *	ctx,
		const uint8_t *	samples,
		int	nb_samples,
		int	is24
	)

static

Inputs data from the samples passed by lavc into the context, shifts them appropriately depending on the bit-depth, and calculates the lossless_check_data that will be written to the restart header.

Definition at line 1167 of file mlpenc.c.

Referenced by input_data().

◆ input_data()

static void input_data	(	MLPEncodeContext *	ctx,
		void *	samples,
		int	nb_samples
	)

static

Wrapper function for inputting data in two different bit-depths.

Examples: transcode_aac.c.

Definition at line 1205 of file mlpenc.c.

Referenced by apng_do_inverse_blend(), convert_samples(), mlp_encode_frame(), and write_picture().

◆ input_to_sample_buffer()

static void input_to_sample_buffer ( MLPEncodeContext * ctx )

static

Definition at line 1210 of file mlpenc.c.

Referenced by mlp_encode_frame().

◆ number_trailing_zeroes()

static int number_trailing_zeroes ( int32_t sample )

static

Counts the number of trailing zeroes in a value.

Definition at line 1232 of file mlpenc.c.

Referenced by determine_quant_step_size().

◆ determine_quant_step_size()

static void determine_quant_step_size ( MLPEncodeContext * ctx )

static

Determines how many bits are zero at the end of all samples so they can be shifted out.

Definition at line 1247 of file mlpenc.c.

Referenced by analyze_sample_buffer().

◆ code_filter_coeffs()

static void code_filter_coeffs	(	MLPEncodeContext *	ctx,
		FilterParams *	fp,
		int32_t *	fcoeff
	)

static

Determines the smallest number of bits needed to encode the filter coefficients, and if it's possible to right-shift their values without losing any precision.

Definition at line 1272 of file mlpenc.c.

Referenced by set_filter_params().

◆ set_filter_params()

static void set_filter_params	(	MLPEncodeContext *	ctx,
		unsigned int	channel,
		unsigned int	filter,
		int	clear_filter
	)

static

Determines the best filter parameters for the given data and writes the necessary information to the context.

TODO Add IIR filter predictor!

Definition at line 1301 of file mlpenc.c.

Referenced by apply_filters(), and determine_filters().

◆ determine_filters()

static void determine_filters ( MLPEncodeContext * ctx )

static

Tries to determine a good prediction filter, and applies it to the samples buffer if the filter is good enough.

Sets the filter data to be cleared if no good filter was found.

Definition at line 1348 of file mlpenc.c.

Referenced by analyze_sample_buffer().

◆ estimate_stereo_mode()

static enum MLPChMode estimate_stereo_mode ( MLPEncodeContext * ctx )

static

Definition at line 1365 of file mlpenc.c.

Referenced by lossless_matrix_coeffs().

◆ code_matrix_coeffs()

static void code_matrix_coeffs	(	MLPEncodeContext *	ctx,
		unsigned int	mat
	)

static

Determines how many fractional bits are needed to encode matrix coefficients.

Also shifts the coefficients to fit within 2.14 bits.

Definition at line 1398 of file mlpenc.c.

Referenced by lossless_matrix_coeffs().

◆ lossless_matrix_coeffs()

static void lossless_matrix_coeffs ( MLPEncodeContext * ctx )

static

Determines best coefficients to use for the lossless matrix.

Definition at line 1416 of file mlpenc.c.

Referenced by analyze_sample_buffer().

◆ no_codebook_bits_offset()

static void no_codebook_bits_offset	(	MLPEncodeContext *	ctx,
		unsigned int	channel,
		int16_t	offset,
		int32_t	min,
		int32_t	max,
		BestOffset *	bo
	)

static

Determines the amount of bits needed to encode the samples using no codebooks and a specified offset.

Definition at line 1474 of file mlpenc.c.

Referenced by determine_bits().

◆ no_codebook_bits()

static void no_codebook_bits	(	MLPEncodeContext *	ctx,
		unsigned int	channel,
		int32_t	min,
		int32_t	max,
		BestOffset *	bo
	)

static

Determines the least amount of bits needed to encode the samples using no codebooks.

Definition at line 1503 of file mlpenc.c.

Referenced by determine_bits().

◆ codebook_bits_offset()

static void codebook_bits_offset	(	MLPEncodeContext *	ctx,
		unsigned int	channel,
		int	codebook,
		int32_t	sample_min,
		int32_t	sample_max,
		int16_t	offset,
		BestOffset *	bo
	)

inlinestatic

Determines the least amount of bits needed to encode the samples using a given codebook and a given offset.

Definition at line 1543 of file mlpenc.c.

Referenced by codebook_bits(), and determine_bits().

◆ codebook_bits()

static void codebook_bits	(	MLPEncodeContext *	ctx,
		unsigned int	channel,
		int	codebook,
		int	offset,
		int32_t	min,
		int32_t	max,
		BestOffset *	bo,
		int	direction
	)

inlinestatic

Determines the least amount of bits needed to encode the samples using a given codebook.

Searches for the best offset to minimize the bits.

Definition at line 1606 of file mlpenc.c.

Referenced by determine_bits().

◆ determine_bits()

static void determine_bits ( MLPEncodeContext * ctx )

static

Determines the least amount of bits needed to encode the samples using any or no codebook.

Definition at line 1646 of file mlpenc.c.

Referenced by analyze_sample_buffer().

◆ apply_filter()

static int apply_filter	(	MLPEncodeContext *	ctx,
		unsigned int	channel
	)

static

Applies the filter to the current samples, and saves the residual back into the samples buffer.

If the filter is too bad and overflows the maximum amount of bits allowed (24), the samples buffer is left as is and the function returns -1.

Definition at line 1716 of file mlpenc.c.

Referenced by apply_filters().

◆ apply_filters()

static void apply_filters ( MLPEncodeContext * ctx )

static

Definition at line 1769 of file mlpenc.c.

Referenced by analyze_sample_buffer(), and process_major_frame().

◆ generate_2_noise_channels()

static void generate_2_noise_channels ( MLPEncodeContext * ctx )

static

Generates two noise channels worth of data.

Definition at line 1785 of file mlpenc.c.

Referenced by analyze_sample_buffer(), and process_major_frame().

◆ rematrix_channels()

static void rematrix_channels ( MLPEncodeContext * ctx )

static

Rematrixes all channels using chosen coefficients.

Definition at line 1805 of file mlpenc.c.

Referenced by analyze_sample_buffer(), and process_major_frame().

◆ clear_path_counter()

static void clear_path_counter ( PathCounter * path_counter )

static

Definition at line 1844 of file mlpenc.c.

Referenced by set_best_codebook().

◆ compare_best_offset()

static int compare_best_offset	(	const BestOffset *	prev,
		const BestOffset *	cur
	)

static

Definition at line 1849 of file mlpenc.c.

Referenced by best_codebook_path_cost(), and set_best_codebook().

◆ best_codebook_path_cost()

static int best_codebook_path_cost	(	MLPEncodeContext *	ctx,
		unsigned int	channel,
		PathCounter *	src,
		int	cur_codebook
	)

static

Definition at line 1854 of file mlpenc.c.

Referenced by set_best_codebook().

◆ set_best_codebook()

static void set_best_codebook ( MLPEncodeContext * ctx )

static

Definition at line 1873 of file mlpenc.c.

Referenced by analyze_sample_buffer().

◆ set_major_params()

static void set_major_params ( MLPEncodeContext * ctx )

static

Analyzes all collected bitcounts and selects the best parameters for each individual access unit.

TODO This is just a stub!

Definition at line 1954 of file mlpenc.c.

Referenced by mlp_encode_frame().

◆ analyze_sample_buffer()

static void analyze_sample_buffer ( MLPEncodeContext * ctx )

static

Definition at line 2002 of file mlpenc.c.

Referenced by mlp_encode_frame().

◆ process_major_frame()

static void process_major_frame ( MLPEncodeContext * ctx )

static

Definition at line 2045 of file mlpenc.c.

Referenced by mlp_encode_frame().

◆ mlp_encode_frame()

static int mlp_encode_frame	(	AVCodecContext *	avctx,
		AVPacket *	avpkt,
		const AVFrame *	frame,
		int *	got_packet
	)

static

Definition at line 2065 of file mlpenc.c.

◆ mlp_encode_close()

static av_cold int mlp_encode_close ( AVCodecContext * avctx )

static

Definition at line 2189 of file mlpenc.c.

Variable Documentation

◆ restart_channel_params

ChannelParams restart_channel_params[MAX_CHANNELS]

static

Definition at line 212 of file mlpenc.c.

Referenced by mlp_encode_init_static(), and set_major_params().

◆ restart_decoding_params

DecodingParams restart_decoding_params[MAX_SUBSTREAMS]

static

Definition at line 213 of file mlpenc.c.

Referenced by mlp_encode_init_static(), and set_major_params().

◆ restart_best_offset

const BestOffset restart_best_offset[NUM_CODEBOOKS] = {{0}}

static

Definition at line 214 of file mlpenc.c.

Referenced by best_codebook_path_cost(), and set_best_codebook().

◆ codebook_extremes

const int codebook_extremes[3][2]

static

Initial value:

= {
    {-9, 8}, {-8, 7}, {-15, 14},
}

Min and max values that can be encoded with each codebook.

The values for the third codebook take into account the fact that the sign shift for this codebook is outside the coded value, so it has one more bit of precision. It should actually be -7 -> 7, shifted down by 0.5.

Definition at line 1467 of file mlpenc.c.

Referenced by codebook_bits_offset().

Data Structures

Macros

Enumerations

Functions

Variables

Macro Definition Documentation

◆ MAJOR_HEADER_INTERVAL

◆ MLP_MIN_LPC_ORDER

◆ MLP_MAX_LPC_ORDER

◆ MLP_MIN_LPC_SHIFT

◆ MLP_MAX_LPC_SHIFT

◆ HUFF_OFFSET_MIN

◆ HUFF_OFFSET_MAX

◆ NUM_CODEBOOKS

◆ SYNC_MAJOR

◆ MAJOR_SYNC_INFO_SIGNATURE

◆ FLAGS_DVDA

◆ FLAGS_CONST

◆ SUBSTREAM_INFO_MAX_2_CHAN

◆ SUBSTREAM_INFO_HIGH_RATE

◆ SUBSTREAM_INFO_ALWAYS_SET

◆ SUBSTREAM_INFO_2_SUBSTREAMS

◆ SAMPLE_MAX

◆ SAMPLE_MIN

◆ MSB_MASK

◆ CODEBOOK_CHANGE_BITS

Enumeration Type Documentation

◆ ParamFlags

◆ InputBitDepth

◆ MLPChMode

Function Documentation

◆ compare_filter_params()

◆ compare_matrix_params()

◆ compare_decoding_params()

◆ copy_filter_params()

◆ copy_matrix_params()

◆ copy_restart_frame_params()

◆ clear_decoding_params()

◆ clear_channel_params()

◆ default_decoding_params()

◆ number_sbits()

◆ mlp_peak_bitrate()

◆ mlp_encode_init_static()

◆ mlp_encode_init()

◆ write_major_sync()

◆ write_restart_header()

◆ write_matrix_params()

◆ write_filter_params()

◆ write_decoding_params()

◆ write_block_data()

◆ write_substr()

◆ write_frame_headers()

◆ write_access_unit()

◆ input_data_internal()

◆ input_data()

◆ input_to_sample_buffer()

◆ number_trailing_zeroes()

◆ determine_quant_step_size()

◆ code_filter_coeffs()

◆ set_filter_params()

◆ determine_filters()

◆ estimate_stereo_mode()

◆ code_matrix_coeffs()

◆ lossless_matrix_coeffs()

◆ no_codebook_bits_offset()

◆ no_codebook_bits()

◆ codebook_bits_offset()

◆ codebook_bits()

◆ determine_bits()

◆ apply_filter()

◆ apply_filters()

◆ generate_2_noise_channels()

◆ rematrix_channels()

◆ clear_path_counter()

◆ compare_best_offset()

◆ best_codebook_path_cost()

◆ set_best_codebook()

◆ set_major_params()

◆ analyze_sample_buffer()

◆ process_major_frame()