libavcodec/flacenc.c File Reference

#include "libavutil/crc.h"
#include "libavutil/lls.h"
#include "libavutil/md5.h"
#include "avcodec.h"
#include "bitstream.h"
#include "dsputil.h"
#include "golomb.h"
#include "lpc.h"

Go to the source code of this file.

Data Structures

struct  CompressionOptions
struct  RiceContext
struct  FlacSubframe
struct  FlacFrame
struct  FlacEncodeContext

Defines

#define FLAC_MAX_CH   8
 FLAC audio encoder Copyright (c) 2006 Justin Ruggles <justin.ruggles@gmail.com>.
#define FLAC_MIN_BLOCKSIZE   16
#define FLAC_MAX_BLOCKSIZE   65535
#define FLAC_SUBFRAME_CONSTANT   0
#define FLAC_SUBFRAME_VERBATIM   1
#define FLAC_SUBFRAME_FIXED   8
#define FLAC_SUBFRAME_LPC   32
#define FLAC_CHMODE_NOT_STEREO   0
#define FLAC_CHMODE_LEFT_RIGHT   1
#define FLAC_CHMODE_LEFT_SIDE   8
#define FLAC_CHMODE_RIGHT_SIDE   9
#define FLAC_CHMODE_MID_SIDE   10
#define FLAC_STREAMINFO_SIZE   34
#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)

Functions

static void write_streaminfo (FlacEncodeContext *s, uint8_t *header)
 Writes streaminfo metadata block to byte array.
static int select_blocksize (int samplerate, int block_time_ms)
 Sets blocksize based on samplerate Chooses the closest predefined blocksize >= BLOCK_TIME_MS milliseconds.
static av_cold int flac_encode_init (AVCodecContext *avctx)
static void init_frame (FlacEncodeContext *s)
static void copy_samples (FlacEncodeContext *s, int16_t *samples)
 Copy channel-interleaved input samples into separate subframes.
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 calc_rice_params_fixed (RiceContext *rc, int pmin, int pmax, int32_t *data, int n, int pred_order, int bps)
static uint32_t calc_rice_params_lpc (RiceContext *rc, int pmin, int pmax, int32_t *data, int n, int pred_order, int bps, int precision)
static void apply_welch_window (const int32_t *data, int len, double *w_data)
 Apply Welch window function to audio block.
void ff_flac_compute_autocorr (const int32_t *data, int len, int lag, double *autoc)
 Calculates autocorrelation data from audio samples A Welch window function is applied before calculation.
static void encode_residual_verbatim (int32_t *res, int32_t *smp, int n)
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 (FlacEncodeContext *ctx, int ch)
static int encode_residual_v (FlacEncodeContext *ctx, int ch)
static int estimate_stereo_mode (int32_t *left_ch, int32_t *right_ch, int n)
static void channel_decorrelation (FlacEncodeContext *ctx)
 Perform stereo channel decorrelation.
static void write_utf8 (PutBitContext *pb, uint32_t val)
static void output_frame_header (FlacEncodeContext *s)
static void output_subframe_constant (FlacEncodeContext *s, int ch)
static void output_subframe_verbatim (FlacEncodeContext *s, int ch)
static void output_residual (FlacEncodeContext *ctx, int ch)
static void output_subframe_fixed (FlacEncodeContext *ctx, int ch)
static void output_subframe_lpc (FlacEncodeContext *ctx, int ch)
static void output_subframes (FlacEncodeContext *s)
static void output_frame_footer (FlacEncodeContext *s)
static void update_md5_sum (FlacEncodeContext *s, 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 int flac_samplerates [16]
static const int flac_blocksizes [16]
AVCodec flac_encoder


Define Documentation

#define FLAC_CHMODE_LEFT_RIGHT   1

Definition at line 41 of file flacenc.c.

Referenced by channel_decorrelation(), and estimate_stereo_mode().

#define FLAC_CHMODE_LEFT_SIDE   8

Definition at line 42 of file flacenc.c.

Referenced by channel_decorrelation(), and estimate_stereo_mode().

#define FLAC_CHMODE_MID_SIDE   10

Definition at line 44 of file flacenc.c.

Referenced by channel_decorrelation(), and estimate_stereo_mode().

#define FLAC_CHMODE_NOT_STEREO   0

Definition at line 40 of file flacenc.c.

Referenced by channel_decorrelation(), and output_frame_header().

#define FLAC_CHMODE_RIGHT_SIDE   9

Definition at line 43 of file flacenc.c.

Referenced by estimate_stereo_mode().

#define FLAC_MAX_BLOCKSIZE   65535

Definition at line 33 of file flacenc.c.

Referenced by flac_encode_init().

#define FLAC_MAX_CH   8

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

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 31 of file flacenc.c.

Referenced by flac_encode_init().

#define FLAC_MIN_BLOCKSIZE   16

Definition at line 32 of file flacenc.c.

Referenced by flac_encode_init().

#define FLAC_STREAMINFO_SIZE   34

Definition at line 46 of file flacenc.c.

#define FLAC_SUBFRAME_CONSTANT   0

Definition at line 35 of file flacenc.c.

Referenced by encode_residual(), encode_residual_v(), and output_subframes().

#define FLAC_SUBFRAME_FIXED   8

Definition at line 37 of file flacenc.c.

Referenced by encode_residual(), and output_subframes().

#define FLAC_SUBFRAME_LPC   32

Definition at line 38 of file flacenc.c.

Referenced by encode_residual(), and output_subframes().

#define FLAC_SUBFRAME_VERBATIM   1

Definition at line 36 of file flacenc.c.

Referenced by encode_residual(), encode_residual_v(), and output_subframes().

#define LPC1 (  ) 

Value:

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

Definition at line 704 of file flacenc.c.

Referenced by encode_residual_lpc_unrolled().

#define MAX_FIXED_ORDER   4

Definition at line 48 of file flacenc.c.

Referenced by encode_residual(), and flac_encode_init().

#define MAX_LPC_PRECISION   15

Definition at line 51 of file flacenc.c.

Referenced by flac_encode_init().

#define MAX_LPC_SHIFT   15

Definition at line 52 of file flacenc.c.

Referenced by encode_residual().

#define MAX_PARTITION_ORDER   8

Definition at line 49 of file flacenc.c.

Referenced by calc_rice_params(), and flac_encode_init().

#define MAX_PARTITIONS   (1 << MAX_PARTITION_ORDER)

Definition at line 50 of file flacenc.c.

Referenced by calc_rice_params().

#define MAX_RICE_PARAM   14

Definition at line 53 of file flacenc.c.

Referenced by find_optimal_param().

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

Definition at line 449 of file flacenc.c.

Referenced by calc_optimal_rice_params(), and estimate_stereo_mode().


Function Documentation

static void apply_welch_window ( const int32_t *  data,
int  len,
double *  w_data 
) [static]

Apply Welch window function to audio block.

Definition at line 587 of file flacenc.c.

Referenced by ff_flac_compute_autocorr().

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

Definition at line 466 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 517 of file flacenc.c.

Referenced by calc_rice_params_fixed(), and calc_rice_params_lpc().

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

Definition at line 560 of file flacenc.c.

Referenced by encode_residual().

static uint32_t calc_rice_params_lpc ( RiceContext rc,
int  pmin,
int  pmax,
int32_t *  data,
int  n,
int  pred_order,
int  bps,
int  precision 
) [static]

Definition at line 572 of file flacenc.c.

Referenced by encode_residual().

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 489 of file flacenc.c.

Referenced by calc_rice_params().

static void channel_decorrelation ( FlacEncodeContext ctx  )  [static]

Perform stereo channel decorrelation.

Definition at line 1027 of file flacenc.c.

Referenced by flac_encode_frame().

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

Copy channel-interleaved input samples into separate subframes.

Definition at line 435 of file flacenc.c.

Referenced by flac_encode_frame().

static int encode_residual ( FlacEncodeContext ctx,
int  ch 
) [static]

Definition at line 807 of file flacenc.c.

Referenced by flac_encode_frame().

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

Definition at line 653 of file flacenc.c.

Referenced by encode_residual().

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 771 of file flacenc.c.

Referenced by encode_residual().

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 711 of file flacenc.c.

Referenced by encode_residual_lpc().

static int encode_residual_v ( FlacEncodeContext ctx,
int  ch 
) [static]

Definition at line 947 of file flacenc.c.

Referenced by flac_encode_frame().

static void encode_residual_verbatim ( int32_t *  res,
int32_t *  smp,
int  n 
) [static]

Definition at line 647 of file flacenc.c.

Referenced by encode_residual(), and encode_residual_v().

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

Definition at line 976 of file flacenc.c.

void ff_flac_compute_autocorr ( const int32_t *  data,
int  len,
int  lag,
double *  autoc 
)

Calculates autocorrelation data from audio samples A Welch window function is applied before calculation.

Definition at line 613 of file flacenc.c.

Referenced by dsputil_init().

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 454 of file flacenc.c.

Referenced by calc_optimal_rice_params(), and estimate_stereo_mode().

static av_cold int flac_encode_close ( AVCodecContext avctx  )  [static]

Definition at line 1335 of file flacenc.c.

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

Definition at line 1267 of file flacenc.c.

static av_cold int flac_encode_init ( AVCodecContext avctx  )  [static]

Definition at line 172 of file flacenc.c.

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

Definition at line 552 of file flacenc.c.

Referenced by calc_rice_params_fixed(), and calc_rice_params_lpc().

static void init_frame ( FlacEncodeContext s  )  [static]

Definition at line 401 of file flacenc.c.

Referenced by flac_encode_frame(), and vp3_decode_frame().

static void output_frame_footer ( FlacEncodeContext s  )  [static]

Definition at line 1244 of file flacenc.c.

Referenced by flac_encode_frame().

static void output_frame_header ( FlacEncodeContext s  )  [static]

Definition at line 1076 of file flacenc.c.

static void output_residual ( FlacEncodeContext ctx,
int  ch 
) [static]

Definition at line 1136 of file flacenc.c.

Referenced by output_subframe_fixed(), and output_subframe_lpc().

static void output_subframe_constant ( FlacEncodeContext s,
int  ch 
) [static]

Definition at line 1110 of file flacenc.c.

Referenced by output_subframes().

static void output_subframe_fixed ( FlacEncodeContext ctx,
int  ch 
) [static]

Definition at line 1171 of file flacenc.c.

Referenced by output_subframes().

static void output_subframe_lpc ( FlacEncodeContext ctx,
int  ch 
) [static]

Definition at line 1189 of file flacenc.c.

Referenced by output_subframes().

static void output_subframe_verbatim ( FlacEncodeContext s,
int  ch 
) [static]

Definition at line 1120 of file flacenc.c.

Referenced by output_subframes().

static void output_subframes ( FlacEncodeContext s  )  [static]

Definition at line 1215 of file flacenc.c.

Referenced by flac_encode_frame().

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

Sets blocksize based on samplerate Chooses the closest predefined blocksize >= BLOCK_TIME_MS milliseconds.

Definition at line 155 of file flacenc.c.

Referenced by flac_encode_init().

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

Definition at line 1254 of file flacenc.c.

Referenced by flac_encode_frame().

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

Writes streaminfo metadata block to byte array.

Definition at line 129 of file flacenc.c.

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

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

Definition at line 1070 of file flacenc.c.

Referenced by output_frame_header().


Variable Documentation

const int flac_blocksizes[16] [static]

Initial value:

 {
    0,
    192,
    576, 1152, 2304, 4608,
    0, 0,
    256, 512, 1024, 2048, 4096, 8192, 16384, 32768
}

Definition at line 118 of file flacenc.c.

Referenced by init_frame(), and select_blocksize().

Initial value:

 {
    "flac",
    CODEC_TYPE_AUDIO,
    CODEC_ID_FLAC,
    sizeof(FlacEncodeContext),
    flac_encode_init,
    flac_encode_frame,
    flac_encode_close,
    NULL,
    .capabilities = CODEC_CAP_SMALL_LAST_FRAME | CODEC_CAP_DELAY,
    .sample_fmts = (enum SampleFormat[]){SAMPLE_FMT_S16,SAMPLE_FMT_NONE},
    .long_name = NULL_IF_CONFIG_SMALL("FLAC (Free Lossless Audio Codec)"),
}

Definition at line 1347 of file flacenc.c.

const int flac_samplerates[16] [static]

Initial value:

 {
    0, 0, 0, 0,
    8000, 16000, 22050, 24000, 32000, 44100, 48000, 96000,
    0, 0, 0, 0
}

Definition at line 112 of file flacenc.c.

Referenced by flac_encode_init().


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