libavcodec/flacenc.c File Reference

#include "libavutil/crc.h"
#include "libavutil/md5.h"
#include "avcodec.h"
#include "get_bits.h"
#include "dsputil.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)

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 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

AVCodec flac_encoder

Define Documentation

#define FLAC_SUBFRAME_CONSTANT   0

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 32 of file flacenc.c.

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

#define FLAC_SUBFRAME_FIXED   8

Definition at line 34 of file flacenc.c.

Referenced by encode_residual(), and output_subframes().

#define FLAC_SUBFRAME_LPC   32

Definition at line 35 of file flacenc.c.

Referenced by encode_residual(), and output_subframes().

#define FLAC_SUBFRAME_VERBATIM   1

Definition at line 33 of file flacenc.c.

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

#define LPC1 ( x   ) 

Value:

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

Definition at line 612 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(), 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().

#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 420 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 437 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 488 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 531 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 543 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 460 of file flacenc.c.

Referenced by calc_rice_params().

static void channel_decorrelation ( FlacEncodeContext *  ctx  )  [static]

Perform stereo channel decorrelation.

Definition at line 935 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 406 of file flacenc.c.

Referenced by flac_encode_frame().

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

Definition at line 715 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 561 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 679 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 619 of file flacenc.c.

Referenced by encode_residual_lpc().

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

Definition at line 855 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 555 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 884 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 425 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 1242 of file flacenc.c.

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

Definition at line 1175 of file flacenc.c.

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

Definition at line 146 of file flacenc.c.

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

Definition at line 523 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 372 of file flacenc.c.

Referenced by flac_encode_frame().

static void output_frame_footer ( FlacEncodeContext *  s  )  [static]

Definition at line 1152 of file flacenc.c.

Referenced by flac_encode_frame().

static void output_frame_header ( FlacEncodeContext *  s  )  [static]

Definition at line 984 of file flacenc.c.

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

Definition at line 1044 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 1018 of file flacenc.c.

Referenced by output_subframes().

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

Definition at line 1079 of file flacenc.c.

Referenced by output_subframes().

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

Definition at line 1097 of file flacenc.c.

Referenced by output_subframes().

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

Definition at line 1028 of file flacenc.c.

Referenced by output_subframes().

static void output_subframes ( FlacEncodeContext *  s  )  [static]

Definition at line 1123 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 129 of file flacenc.c.

Referenced by flac_encode_init().

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

Definition at line 1162 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 103 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 978 of file flacenc.c.

Referenced by output_frame_header().

Variable Documentation

AVCodec flac_encoder

Initial value:

 {
    "flac",
    AVMEDIA_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 = (const enum SampleFormat[]){SAMPLE_FMT_S16,SAMPLE_FMT_NONE},
    .long_name = NULL_IF_CONFIG_SMALL("FLAC (Free Lossless Audio Codec)"),
}

Definition at line 1254 of file flacenc.c.

Generated on Fri Oct 26 02:36:51 2012 for FFmpeg by  doxygen 1.5.8