libavcodec/flacenc.c File Reference

#include "libavutil/crc.h"
#include "libavutil/md5.h"
#include "libavutil/opt.h"
#include "avcodec.h"
#include "get_bits.h"
#include "golomb.h"
#include "lpc.h"
#include "flac.h"
#include "flacdata.h"

Go to the source code of this file.

Data Structures

struct CompressionOptions

struct RiceContext

struct FlacSubframe

struct FlacFrame

struct FlacEncodeContext

Defines

#define FLAC_SUBFRAME_CONSTANT   0

FLAC audio encoder Copyright (c) 2006 Justin Ruggles <justin.ruggles@gmail.com>.

#define FLAC_SUBFRAME_VERBATIM   1

#define FLAC_SUBFRAME_FIXED   8

#define FLAC_SUBFRAME_LPC   32

#define MAX_FIXED_ORDER   4

#define MAX_PARTITION_ORDER   8

#define MAX_PARTITIONS   (1 << MAX_PARTITION_ORDER)

#define MAX_LPC_PRECISION   15

#define MAX_LPC_SHIFT   15

#define MAX_RICE_PARAM   14

#define rice_encode_count(sum, n, k)   (((n)*((k)+1))+((sum-(n>>1))>>(k)))

#define LPC1(x)

#define FLAGS   AV_OPT_FLAG_ENCODING_PARAM | AV_OPT_FLAG_AUDIO_PARAM

Functions

static void write_streaminfo (FlacEncodeContext *s, uint8_t *header)

Write streaminfo metadata block to byte array.

static int select_blocksize (int samplerate, int block_time_ms)

Set blocksize based on samplerate.

static av_cold void dprint_compression_options (FlacEncodeContext *s)

static av_cold int flac_encode_init (AVCodecContext *avctx)

static void init_frame (FlacEncodeContext *s)

static void copy_samples (FlacEncodeContext *s, const int16_t *samples)

Copy channel-interleaved input samples into separate subframes.

static int rice_count_exact (int32_t *res, int n, int k)

static int subframe_count_exact (FlacEncodeContext *s, FlacSubframe *sub, int pred_order)

static int find_optimal_param (uint32_t sum, int n)

Solve for d/dk(rice_encode_count) = n-((sum-(n>>1))>>(k+1)) = 0.

static uint32_t calc_optimal_rice_params (RiceContext *rc, int porder, uint32_t *sums, int n, int pred_order)

static void calc_sums (int pmin, int pmax, uint32_t *data, int n, int pred_order, uint32_t sums[][MAX_PARTITIONS])

static uint32_t calc_rice_params (RiceContext *rc, int pmin, int pmax, int32_t *data, int n, int pred_order)

static int get_max_p_order (int max_porder, int n, int order)

static uint32_t find_subframe_rice_params (FlacEncodeContext *s, FlacSubframe *sub, int pred_order)

static void encode_residual_fixed (int32_t *res, const int32_t *smp, int n, int order)

static av_always_inline void encode_residual_lpc_unrolled (int32_t *res, const int32_t *smp, int n, int order, const int32_t *coefs, int shift, int big)

static void encode_residual_lpc (int32_t *res, const int32_t *smp, int n, int order, const int32_t *coefs, int shift)

static int encode_residual_ch (FlacEncodeContext *s, int ch)

static int count_frame_header (FlacEncodeContext *s)

static int encode_frame (FlacEncodeContext *s)

static int estimate_stereo_mode (int32_t *left_ch, int32_t *right_ch, int n)

static void channel_decorrelation (FlacEncodeContext *s)

Perform stereo channel decorrelation.

static void write_utf8 (PutBitContext *pb, uint32_t val)

static void write_frame_header (FlacEncodeContext *s)

static void write_subframes (FlacEncodeContext *s)

static void write_frame_footer (FlacEncodeContext *s)

static int write_frame (FlacEncodeContext *s, uint8_t *frame, int buf_size)

static void update_md5_sum (FlacEncodeContext *s, const int16_t *samples)

static int flac_encode_frame (AVCodecContext *avctx, uint8_t *frame, int buf_size, void *data)

static av_cold int flac_encode_close (AVCodecContext *avctx)

Variables

static const AVOption options []

static const AVClass flac_encoder_class

AVCodec ff_flac_encoder

Define Documentation

#define FLAC_SUBFRAME_CONSTANT 0

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 32 of file flacenc.c.

Referenced by encode_residual_ch(), subframe_count_exact(), and write_subframes().

#define FLAC_SUBFRAME_FIXED 8

Definition at line 34 of file flacenc.c.

Referenced by encode_residual_ch().

#define FLAC_SUBFRAME_LPC 32

Definition at line 35 of file flacenc.c.

Referenced by encode_residual_ch(), find_subframe_rice_params(), subframe_count_exact(), and write_subframes().

#define FLAC_SUBFRAME_VERBATIM 1

Definition at line 33 of file flacenc.c.

Referenced by encode_residual_ch(), subframe_count_exact(), and write_subframes().

#define FLAGS AV_OPT_FLAG_ENCODING_PARAM | AV_OPT_FLAG_AUDIO_PARAM

Definition at line 1353 of file flacenc.c.

#define LPC1 ( x )

Value:

{\
    int c = coefs[(x)-1];\
    p0   += c * s;\
    s     = smp[i-(x)+1];\
    p1   += c * s;\
}

Definition at line 763 of file flacenc.c.

Referenced by encode_residual_lpc_unrolled().

#define MAX_FIXED_ORDER 4

Definition at line 37 of file flacenc.c.

Referenced by encode_residual_ch(), and flac_encode_init().

#define MAX_LPC_PRECISION 15

Definition at line 40 of file flacenc.c.

Referenced by flac_encode_init().

#define MAX_LPC_SHIFT 15

Definition at line 41 of file flacenc.c.

Referenced by encode_residual_ch().

#define MAX_PARTITION_ORDER 8

Definition at line 38 of file flacenc.c.

Referenced by calc_rice_params(), and flac_encode_init().

#define MAX_PARTITIONS (1 << MAX_PARTITION_ORDER)

Definition at line 39 of file flacenc.c.

Referenced by calc_rice_params().

#define MAX_RICE_PARAM 14

Definition at line 42 of file flacenc.c.

Referenced by find_optimal_param().

#define rice_encode_count	(	sum,
		n,
		k	)	(((n)*((k)+1))+((sum-(n>>1))>>(k)))

Definition at line 582 of file flacenc.c.

Referenced by calc_optimal_rice_params(), and estimate_stereo_mode().

Function Documentation

static uint32_t calc_optimal_rice_params	(	RiceContext *	rc,
		int	porder,
		uint32_t *	sums,
		int	n,
		int	pred_order
	)			`[static]`

Definition at line 600 of file flacenc.c.

Referenced by calc_rice_params().

static uint32_t calc_rice_params	(	RiceContext *	rc,
		int	pmin,
		int	pmax,
		int32_t *	data,
		int	n,
		int	pred_order
	)			`[static]`

Definition at line 651 of file flacenc.c.

Referenced by find_subframe_rice_params().

static void calc_sums	(	int	pmin,
		int	pmax,
		uint32_t *	data,
		int	n,
		int	pred_order,
		uint32_t	sums[][MAX_PARTITIONS]
	)			`[static]`

Definition at line 624 of file flacenc.c.

Referenced by calc_rice_params().

static void channel_decorrelation ( FlacEncodeContext * s ) [static]

Perform stereo channel decorrelation.

Definition at line 1105 of file flacenc.c.

Referenced by flac_encode_frame().

static void copy_samples	(	FlacEncodeContext *	s,
		const int16_t *	samples
	)			`[static]`

Copy channel-interleaved input samples into separate subframes.

Definition at line 509 of file flacenc.c.

Referenced by flac_encode_frame().

static int count_frame_header ( FlacEncodeContext * s ) [static]

Definition at line 1003 of file flacenc.c.

Referenced by encode_frame().

static av_cold void dprint_compression_options ( FlacEncodeContext * s ) [static]

Definition at line 153 of file flacenc.c.

Referenced by flac_encode_init().

static int encode_frame ( FlacEncodeContext * s ) [static]

Definition at line 1039 of file flacenc.c.

static int encode_residual_ch	(	FlacEncodeContext *	s,
		int	ch
	)			`[static]`

Definition at line 867 of file flacenc.c.

Referenced by encode_frame().

static void encode_residual_fixed	(	int32_t *	res,
		const int32_t *	smp,
		int	n,
		int	order
	)			`[static]`

Definition at line 712 of file flacenc.c.

Referenced by encode_residual_ch().

static void encode_residual_lpc	(	int32_t *	res,
		const int32_t *	smp,
		int	n,
		int	order,
		const int32_t *	coefs,
		int	shift
	)			`[static]`

Definition at line 831 of file flacenc.c.

Referenced by encode_residual_ch().

static av_always_inline void encode_residual_lpc_unrolled	(	int32_t *	res,
		const int32_t *	smp,
		int	n,
		int	order,
		const int32_t *	coefs,
		int	shift,
		int	big
	)			`[static]`

Definition at line 770 of file flacenc.c.

Referenced by encode_residual_lpc().

static int estimate_stereo_mode	(	int32_t *	left_ch,
		int32_t *	right_ch,
		int	n
	)			`[static]`

Definition at line 1055 of file flacenc.c.

static int find_optimal_param	(	uint32_t	sum,
		int	n
	)			`[static]`

Solve for d/dk(rice_encode_count) = n-((sum-(n>>1))>>(k+1)) = 0.

Definition at line 587 of file flacenc.c.

Referenced by calc_optimal_rice_params(), and estimate_stereo_mode().

static uint32_t find_subframe_rice_params	(	FlacEncodeContext *	s,
		FlacSubframe *	sub,
		int	pred_order
	)			`[static]`

Definition at line 695 of file flacenc.c.

Referenced by encode_residual_ch().

static av_cold int flac_encode_close ( AVCodecContext * avctx ) [static]

Definition at line 1340 of file flacenc.c.

static int flac_encode_frame	(	AVCodecContext *	avctx,
		uint8_t *	frame,
		int	buf_size,
		void *	data
	)			`[static]`

Definition at line 1283 of file flacenc.c.

static av_cold int flac_encode_init ( AVCodecContext * avctx ) [static]

Definition at line 211 of file flacenc.c.

static int get_max_p_order	(	int	max_porder,
		int	n,
		int	order
	)			`[static]`

Definition at line 686 of file flacenc.c.

Referenced by find_subframe_rice_params().

static void init_frame ( FlacEncodeContext * s ) [static]

Definition at line 473 of file flacenc.c.

Referenced by flac_encode_frame().

static int rice_count_exact	(	int32_t *	res,
		int	n,
		int	k
	)			`[static]`

Definition at line 521 of file flacenc.c.

Referenced by subframe_count_exact().

static int select_blocksize	(	int	samplerate,
		int	block_time_ms
	)			`[static]`

Set blocksize based on samplerate.

Choose the closest predefined blocksize >= BLOCK_TIME_MS milliseconds.

Definition at line 134 of file flacenc.c.

Referenced by flac_encode_init().

static int subframe_count_exact	(	FlacEncodeContext *	s,
		FlacSubframe *	sub,
		int	pred_order
	)			`[static]`

Definition at line 535 of file flacenc.c.

Referenced by encode_residual_ch().

static void update_md5_sum	(	FlacEncodeContext *	s,
		const int16_t *	samples
	)			`[static]`

Definition at line 1269 of file flacenc.c.

Referenced by flac_encode_frame().

static int write_frame	(	FlacEncodeContext *	s,
		uint8_t *	frame,
		int	buf_size
	)			`[static]`

Definition at line 1259 of file flacenc.c.

static void write_frame_footer ( FlacEncodeContext * s ) [static]

Definition at line 1248 of file flacenc.c.

Referenced by write_frame().

static void write_frame_header ( FlacEncodeContext * s ) [static]

Definition at line 1153 of file flacenc.c.

static void write_streaminfo	(	FlacEncodeContext *	s,
		uint8_t *	header
	)			`[static]`

Write streaminfo metadata block to byte array.

Definition at line 107 of file flacenc.c.

Referenced by flac_encode_frame(), flac_encode_init(), and write_headers().

static void write_subframes ( FlacEncodeContext * s ) [static]

Definition at line 1190 of file flacenc.c.

Referenced by write_frame().

static void write_utf8	(	PutBitContext *	pb,
		uint32_t	val
	)			`[static]`

Definition at line 1146 of file flacenc.c.

Referenced by write_frame_header().

Variable Documentation

AVCodec ff_flac_encoder

Initial value:

 {
    .name           = "flac",
    .type           = AVMEDIA_TYPE_AUDIO,
    .id             = CODEC_ID_FLAC,
    .priv_data_size = sizeof(FlacEncodeContext),
    .init           = flac_encode_init,
    .encode         = flac_encode_frame,
    .close          = flac_encode_close,
    .capabilities = CODEC_CAP_SMALL_LAST_FRAME | CODEC_CAP_DELAY | CODEC_CAP_LOSSLESS,
    .sample_fmts = (const enum AVSampleFormat[]){AV_SAMPLE_FMT_S16,AV_SAMPLE_FMT_NONE},
    .long_name = NULL_IF_CONFIG_SMALL("FLAC (Free Lossless Audio Codec)"),
    .priv_class = &flac_encoder_class,
}

Definition at line 1381 of file flacenc.c.

const AVClass flac_encoder_class [static]

Initial value:

 {
    "FLAC encoder",
    av_default_item_name,
    options,
    LIBAVUTIL_VERSION_INT,
}

Definition at line 1374 of file flacenc.c.

const AVOption options[] [static]

Initial value:

 {
{ "lpc_coeff_precision", "LPC coefficient precision", 0x42, AV_OPT_TYPE_INT, {.dbl = 15 }, 0, MAX_LPC_PRECISION, FLAGS },
{ "lpc_type", "LPC algorithm", 0x42, AV_OPT_TYPE_INT, {.dbl = FF_LPC_TYPE_DEFAULT }, FF_LPC_TYPE_DEFAULT, FF_LPC_TYPE_NB-1, FLAGS, "lpc_type" },
{ "none",     NULL, 0, AV_OPT_TYPE_CONST, {.dbl = FF_LPC_TYPE_NONE },     INT_MIN, INT_MAX, FLAGS, "lpc_type" },
{ "fixed",    NULL, 0, AV_OPT_TYPE_CONST, {.dbl = FF_LPC_TYPE_FIXED },    INT_MIN, INT_MAX, FLAGS, "lpc_type" },
{ "levinson", NULL, 0, AV_OPT_TYPE_CONST, {.dbl = FF_LPC_TYPE_LEVINSON }, INT_MIN, INT_MAX, FLAGS, "lpc_type" },
{ "cholesky", NULL, 0, AV_OPT_TYPE_CONST, {.dbl = FF_LPC_TYPE_CHOLESKY }, INT_MIN, INT_MAX, FLAGS, "lpc_type" },
{ "lpc_passes", "Number of passes to use for Cholesky factorization during LPC analysis", 0x42,  AV_OPT_TYPE_INT, {.dbl = -1 }, INT_MIN, INT_MAX, FLAGS },
{ "min_partition_order",  NULL, 0x42,  AV_OPT_TYPE_INT, {.dbl = -1 },      -1, MAX_PARTITION_ORDER, FLAGS },
{ "max_partition_order",  NULL, 0x42,  AV_OPT_TYPE_INT, {.dbl = -1 },      -1, MAX_PARTITION_ORDER, FLAGS },
{ "prediction_order_method", "Search method for selecting prediction order", 0x42, AV_OPT_TYPE_INT, {.dbl = -1 }, -1, ORDER_METHOD_LOG, FLAGS, "predm" },
{ "estimation", NULL, 0, AV_OPT_TYPE_CONST, {.dbl = ORDER_METHOD_EST },    INT_MIN, INT_MAX, FLAGS, "predm" },
{ "2level",     NULL, 0, AV_OPT_TYPE_CONST, {.dbl = ORDER_METHOD_2LEVEL }, INT_MIN, INT_MAX, FLAGS, "predm" },
{ "4level",     NULL, 0, AV_OPT_TYPE_CONST, {.dbl = ORDER_METHOD_4LEVEL }, INT_MIN, INT_MAX, FLAGS, "predm" },
{ "8level",     NULL, 0, AV_OPT_TYPE_CONST, {.dbl = ORDER_METHOD_8LEVEL }, INT_MIN, INT_MAX, FLAGS, "predm" },
{ "search",     NULL, 0, AV_OPT_TYPE_CONST, {.dbl = ORDER_METHOD_SEARCH }, INT_MIN, INT_MAX, FLAGS, "predm" },
{ "log",        NULL, 0, AV_OPT_TYPE_CONST, {.dbl = ORDER_METHOD_LOG },    INT_MIN, INT_MAX, FLAGS, "predm" },
{ NULL },
}

Definition at line 1354 of file flacenc.c.


Data Structures
struct	CompressionOptions
struct	RiceContext
struct	FlacSubframe
struct	FlacFrame
struct	FlacEncodeContext
Defines
#define	FLAC_SUBFRAME_CONSTANT 0
	FLAC audio encoder Copyright (c) 2006 Justin Ruggles <justin.ruggles@gmail.com>.
#define	FLAC_SUBFRAME_VERBATIM 1
#define	FLAC_SUBFRAME_FIXED 8
#define	FLAC_SUBFRAME_LPC 32
#define	MAX_FIXED_ORDER 4
#define	MAX_PARTITION_ORDER 8
#define	MAX_PARTITIONS (1 << MAX_PARTITION_ORDER)
#define	MAX_LPC_PRECISION 15
#define	MAX_LPC_SHIFT 15
#define	MAX_RICE_PARAM 14
#define	rice_encode_count(sum, n, k) (((n)*((k)+1))+((sum-(n>>1))>>(k)))
#define	LPC1(x)
#define	FLAGS AV_OPT_FLAG_ENCODING_PARAM \| AV_OPT_FLAG_AUDIO_PARAM
Functions
static void	write_streaminfo (FlacEncodeContext s, uint8_t header)
	Write streaminfo metadata block to byte array.
static int	select_blocksize (int samplerate, int block_time_ms)
	Set blocksize based on samplerate.
static av_cold void	dprint_compression_options (FlacEncodeContext *s)
static av_cold int	flac_encode_init (AVCodecContext *avctx)
static void	init_frame (FlacEncodeContext *s)
static void	copy_samples (FlacEncodeContext s, const int16_t samples)
	Copy channel-interleaved input samples into separate subframes.
static int	rice_count_exact (int32_t *res, int n, int k)
static int	subframe_count_exact (FlacEncodeContext s, FlacSubframe sub, int pred_order)
static int	find_optimal_param (uint32_t sum, int n)
	Solve for d/dk(rice_encode_count) = n-((sum-(n>>1))>>(k+1)) = 0.
static uint32_t	calc_optimal_rice_params (RiceContext rc, int porder, uint32_t sums, int n, int pred_order)
static void	calc_sums (int pmin, int pmax, uint32_t *data, int n, int pred_order, uint32_t sums[][MAX_PARTITIONS])
static uint32_t	calc_rice_params (RiceContext rc, int pmin, int pmax, int32_t data, int n, int pred_order)
static int	get_max_p_order (int max_porder, int n, int order)
static uint32_t	find_subframe_rice_params (FlacEncodeContext s, FlacSubframe sub, int pred_order)
static void	encode_residual_fixed (int32_t res, const int32_t smp, int n, int order)
static av_always_inline void	encode_residual_lpc_unrolled (int32_t res, const int32_t smp, int n, int order, const int32_t *coefs, int shift, int big)
static void	encode_residual_lpc (int32_t res, const int32_t smp, int n, int order, const int32_t *coefs, int shift)
static int	encode_residual_ch (FlacEncodeContext *s, int ch)
static int	count_frame_header (FlacEncodeContext *s)
static int	encode_frame (FlacEncodeContext *s)
static int	estimate_stereo_mode (int32_t left_ch, int32_t right_ch, int n)
static void	channel_decorrelation (FlacEncodeContext *s)
	Perform stereo channel decorrelation.
static void	write_utf8 (PutBitContext *pb, uint32_t val)
static void	write_frame_header (FlacEncodeContext *s)
static void	write_subframes (FlacEncodeContext *s)
static void	write_frame_footer (FlacEncodeContext *s)
static int	write_frame (FlacEncodeContext s, uint8_t frame, int buf_size)
static void	update_md5_sum (FlacEncodeContext s, const int16_t samples)
static int	flac_encode_frame (AVCodecContext avctx, uint8_t frame, int buf_size, void *data)
static av_cold int	flac_encode_close (AVCodecContext *avctx)
Variables
static const AVOption	options []
static const AVClass	flac_encoder_class
AVCodec	ff_flac_encoder