flacenc.c File Reference

Go to the source code of this file.

Classes

struct  CompressionOptions
struct  RiceContext
struct  FlacSubframe
struct  FlacFrame
struct  FlacEncodeContext

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 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 compute_lpc_coefs (const double *autoc, int max_order, double lpc[][MAX_LPC_ORDER], double *ref)
 Levinson-Durbin recursion.
static void quantize_lpc_coefs (double *lpc_in, int order, int precision, int32_t *lpc_out, int *shift)
 Quantize LPC coefficients.
static int estimate_best_order (double *ref, int max_order)
static int lpc_calc_coefs (FlacEncodeContext *s, const int32_t *samples, int blocksize, int max_order, int precision, int32_t coefs[][MAX_LPC_ORDER], int *shift, int use_lpc, int omethod)
 Calculate LPC coefficients for multiple orders.
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 put_sbits (PutBitContext *pb, int bits, int32_t val)
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 int flac_encode_frame (AVCodecContext *avctx, uint8_t *frame, int buf_size, void *data)
static int flac_encode_close (AVCodecContext *avctx)

Variables

static const int flac_samplerates [16]
static const int flac_blocksizes [16]
AVCodec flac_encoder

Function Documentation

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

Writes streaminfo metadata block to byte array.

Definition at line 131 of file flacenc.c.

Referenced by flac_encode_init().

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 int flac_encode_init ( AVCodecContext *  avctx  )  [static]

Definition at line 172 of file flacenc.c.

static void init_frame ( FlacEncodeContext *  s  )  [static]

Definition at line 404 of file flacenc.c.

Referenced by flac_encode_frame(), and vp3_decode_frame().

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

Copy channel-interleaved input samples into separate subframes.

Definition at line 438 of file flacenc.c.

Referenced by AudioOutputBase::_AddSamples(), and flac_encode_frame().

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 457 of file flacenc.c.

Referenced by calc_optimal_rice_params(), and estimate_stereo_mode().

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

Definition at line 469 of file flacenc.c.

Referenced by calc_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 492 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 520 of file flacenc.c.

Referenced by calc_rice_params_fixed(), and calc_rice_params_lpc().

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

Definition at line 555 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 563 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 575 of file flacenc.c.

Referenced by encode_residual().

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 590 of file flacenc.c.

Referenced by ff_flac_compute_autocorr().

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 610 of file flacenc.c.

Referenced by dsputil_init().

static void compute_lpc_coefs ( const double *  autoc,
int  max_order,
double  lpc[][MAX_LPC_ORDER],
double *  ref 
) [static]

Levinson-Durbin recursion.

Produces LPC coefficients from autocorrelation data.

Definition at line 647 of file flacenc.c.

Referenced by lpc_calc_coefs().

static void quantize_lpc_coefs ( double *  lpc_in,
int  order,
int  precision,
int32_t *  lpc_out,
int *  shift 
) [static]

Quantize LPC coefficients.

Definition at line 687 of file flacenc.c.

Referenced by lpc_calc_coefs().

static int estimate_best_order ( double *  ref,
int  max_order 
) [static]

Definition at line 736 of file flacenc.c.

Referenced by lpc_calc_coefs().

static int lpc_calc_coefs ( FlacEncodeContext *  s,
const int32_t *  samples,
int  blocksize,
int  max_order,
int  precision,
int32_t  coefs[][MAX_LPC_ORDER],
int *  shift,
int  use_lpc,
int  omethod 
) [static]

Calculate LPC coefficients for multiple orders.

Definition at line 753 of file flacenc.c.

Referenced by encode_residual().

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

Definition at line 823 of file flacenc.c.

Referenced by encode_residual(), and encode_residual_v().

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

Definition at line 829 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 887 of file flacenc.c.

Referenced by encode_residual_lpc().

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 947 of file flacenc.c.

Referenced by encode_residual().

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

Definition at line 983 of file flacenc.c.

Referenced by flac_encode_frame().

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

Definition at line 1121 of file flacenc.c.

Referenced by flac_encode_frame().

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

Definition at line 1150 of file flacenc.c.

Referenced by channel_decorrelation().

static void channel_decorrelation ( FlacEncodeContext *  ctx  )  [static]

Perform stereo channel decorrelation.

Definition at line 1201 of file flacenc.c.

Referenced by flac_encode_frame().

static void put_sbits ( PutBitContext *  pb,
int  bits,
int32_t  val 
) [static]

Definition at line 1244 of file flacenc.c.

Referenced by output_subframe_constant(), output_subframe_fixed(), output_subframe_lpc(), and output_subframe_verbatim().

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

Definition at line 1251 of file flacenc.c.

Referenced by output_frame_header().

static void output_frame_header ( FlacEncodeContext *  s  )  [static]

Definition at line 1257 of file flacenc.c.

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

Definition at line 1290 of file flacenc.c.

Referenced by output_subframes().

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

Definition at line 1300 of file flacenc.c.

Referenced by output_subframes().

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

Definition at line 1316 of file flacenc.c.

Referenced by output_subframe_fixed(), and output_subframe_lpc().

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

Definition at line 1351 of file flacenc.c.

Referenced by output_subframes().

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

Definition at line 1369 of file flacenc.c.

Referenced by output_subframes().

static void output_subframes ( FlacEncodeContext *  s  )  [static]

Definition at line 1395 of file flacenc.c.

Referenced by flac_encode_frame().

static void output_frame_footer ( FlacEncodeContext *  s  )  [static]

Definition at line 1424 of file flacenc.c.

Referenced by flac_encode_frame().

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

Definition at line 1433 of file flacenc.c.

static int flac_encode_close ( AVCodecContext *  avctx  )  [static]

Definition at line 1481 of file flacenc.c.

Variable Documentation

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 114 of file flacenc.c.

Referenced by flac_encode_init().

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 120 of file flacenc.c.

Referenced by init_frame(), and select_blocksize().

AVCodec flac_encoder

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,
}

Definition at line 1489 of file flacenc.c.

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