flacenc.c File Reference

#include "libavutil/avassert.h"
#include "libavutil/channel_layout.h"
#include "libavutil/crc.h"
#include "libavutil/intmath.h"
#include "libavutil/md5.h"
#include "libavutil/opt.h"
#include "avcodec.h"
#include "bswapdsp.h"
#include "codec_internal.h"
#include "encode.h"
#include "put_bits.h"
#include "lpc.h"
#include "flac.h"
#include "flacdata.h"
#include "flacencdsp.h"

Go to the source code of this file.

Data Structures
struct	CompressionOptions
struct	RiceContext
struct	FlacSubframe
struct	FlacFrame
struct	FlacEncodeContext

Macros
#define	FLAC_SUBFRAME_CONSTANT   0
#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	MIN_LPC_SHIFT   0
#define	MAX_LPC_SHIFT   15
#define	COPY_SAMPLES(bits)
#define	rice_encode_count(sum, n, k)   (((n)*((k)+1))+((sum-(n>>1))>>(k)))
#define	ENCODE_RESIDUAL_FIXED_WITH_RESIDUAL_LIMIT()
#define	LPC_ENCODE_WITH_RESIDUAL_LIMIT()
#define	DEFAULT_TO_VERBATIM()
#define	FLAGS   AV_OPT_FLAG_ENCODING_PARAM | AV_OPT_FLAG_AUDIO_PARAM

Enumerations
enum	CodingMode { CODING_MODE_RICE = 4, CODING_MODE_RICE2 = 5 }

Functions
static void	write_streaminfo (FlacEncodeContext *s, uint8_t *header)
	Write streaminfo metadata block to byte array. More...
static int	flac_get_max_frame_size (int blocksize, int ch, int bps)
	Calculate an estimate for the maximum frame size based on verbatim mode. More...
static int	select_blocksize (int samplerate, int block_time_ms)
	Set blocksize based on samplerate. More...
static av_cold void	dprint_compression_options (FlacEncodeContext *s)
static av_cold int	flac_encode_init (AVCodecContext *avctx)
static void	init_frame (FlacEncodeContext *s, int nb_samples)
static void	copy_samples (FlacEncodeContext *s, const void *samples)
	Copy channel-interleaved input samples into separate subframes. More...
static uint64_t	rice_count_exact (const int32_t *res, int n, int k)
static uint64_t	subframe_count_exact (FlacEncodeContext *s, FlacSubframe *sub, int pred_order)
static int	find_optimal_param (uint64_t sum, int n, int max_param)
	Solve for d/dk(rice_encode_count) = n-((sum-(n>>1))>>(k+1)) = 0. More...
static int	find_optimal_param_exact (uint64_t sums[32][MAX_PARTITIONS], int i, int max_param)
static uint64_t	calc_optimal_rice_params (RiceContext *rc, int porder, uint64_t sums[32][MAX_PARTITIONS], int n, int pred_order, int max_param, int exact)
static void	calc_sum_top (int pmax, int kmax, const uint32_t *data, int n, int pred_order, uint64_t sums[32][MAX_PARTITIONS])
static void	calc_sum_next (int level, uint64_t sums[32][MAX_PARTITIONS], int kmax)
static uint64_t	calc_rice_params (RiceContext *rc, uint32_t udata[FLAC_MAX_BLOCKSIZE], uint64_t sums[32][MAX_PARTITIONS], int pmin, int pmax, const int32_t *data, int n, int pred_order, int exact)
static int	get_max_p_order (int max_porder, int n, int order)
static uint64_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 int	encode_residual_fixed_with_residual_limit (int32_t *res, const int32_t *smp, int n, int order)
static int	encode_residual_fixed_with_residual_limit_33bps (int32_t *res, const int64_t *smp, int n, int order)
static int	lpc_encode_with_residual_limit (int32_t *res, const int32_t *smp, int len, int order, int32_t *coefs, int shift)
static int	lpc_encode_with_residual_limit_33bps (int32_t *res, const int64_t *smp, int len, int order, int32_t *coefs, int shift)
static int	lpc_encode_choose_datapath (FlacEncodeContext *s, int32_t bps, int32_t *res, const int32_t *smp, const int64_t *smp_33bps, int len, int order, 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 void	remove_wasted_bits (FlacEncodeContext *s)
static int	estimate_stereo_mode (const int32_t *left_ch, const int32_t *right_ch, int n, int max_rice_param, int bps)
static void	channel_decorrelation (FlacEncodeContext *s)
	Perform stereo channel decorrelation. More...
static void	write_utf8 (PutBitContext *pb, uint32_t val)
static void	write_frame_header (FlacEncodeContext *s)
static void	set_sr_golomb_flac (PutBitContext *pb, int i, int k)
static void	write_subframes (FlacEncodeContext *s)
static void	write_frame_footer (FlacEncodeContext *s)
static int	write_frame (FlacEncodeContext *s, AVPacket *avpkt)
static int	update_md5_sum (FlacEncodeContext *s, const void *samples)
static int	flac_encode_frame (AVCodecContext *avctx, AVPacket *avpkt, const AVFrame *frame, int *got_packet_ptr)
static av_cold int	flac_encode_close (AVCodecContext *avctx)

Variables
static const AVOption	options []
static const AVClass	flac_encoder_class
const FFCodec	ff_flac_encoder

Macro Definition Documentation

FLAC_SUBFRAME_CONSTANT

#define FLAC_SUBFRAME_CONSTANT   0

Definition at line 39 of file flacenc.c.

FLAC_SUBFRAME_VERBATIM

#define FLAC_SUBFRAME_VERBATIM   1

Definition at line 40 of file flacenc.c.

FLAC_SUBFRAME_FIXED

#define FLAC_SUBFRAME_FIXED   8

Definition at line 41 of file flacenc.c.

FLAC_SUBFRAME_LPC

#define FLAC_SUBFRAME_LPC   32

Definition at line 42 of file flacenc.c.

MAX_FIXED_ORDER

#define MAX_FIXED_ORDER   4

Definition at line 44 of file flacenc.c.

MAX_PARTITION_ORDER

#define MAX_PARTITION_ORDER   8

Definition at line 45 of file flacenc.c.

MAX_PARTITIONS

#define MAX_PARTITIONS   (1 << MAX_PARTITION_ORDER)

Definition at line 46 of file flacenc.c.

MAX_LPC_PRECISION

#define MAX_LPC_PRECISION   15

Definition at line 47 of file flacenc.c.

MIN_LPC_SHIFT

#define MIN_LPC_SHIFT   0

Definition at line 48 of file flacenc.c.

MAX_LPC_SHIFT

#define MAX_LPC_SHIFT   15

Definition at line 49 of file flacenc.c.

COPY_SAMPLES

#define COPY_SAMPLES

(

bits

)

Value:

    do {                                     \
    const int ## bits ## _t *samples0 = samples;                    \
    frame = &s->frame;                                              \
    for (i = 0, j = 0; i < frame->blocksize; i++)                   \
        for (ch = 0; ch < s->channels; ch++, j++)                   \
            frame->subframes[ch].samples[i] = samples0[j] >> shift; \
} while (0)

rice_encode_count

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

Definition at line 608 of file flacenc.c.

ENCODE_RESIDUAL_FIXED_WITH_RESIDUAL_LIMIT

#define ENCODE_RESIDUAL_FIXED_WITH_RESIDUAL_LIMIT

(

)

Definition at line 834 of file flacenc.c.

LPC_ENCODE_WITH_RESIDUAL_LIMIT

#define LPC_ENCODE_WITH_RESIDUAL_LIMIT

(

)

Value:

{                                                        \
   for (int i = 0; i < order; i++)                       \
        res[i] = smp[i];                                 \
    for (int i = order; i < len; i++) {                  \
        int64_t p = 0, tmp;                              \
        for (int j = 0; j < order; j++)                  \
            p += (int64_t)coefs[j]*smp[(i-1)-j];         \
        p >>= shift;                                     \
        tmp = smp[i] - p;                                \
        if (tmp <= INT32_MIN || tmp > INT32_MAX)         \
            return 1;                                    \
        res[i] = tmp;                                    \
    }                                                    \
    return 0;                                            \
}

Definition at line 889 of file flacenc.c.

DEFAULT_TO_VERBATIM

#define DEFAULT_TO_VERBATIM

(

)

Value:

{                                                           \
    sub->type = sub->type_code = FLAC_SUBFRAME_VERBATIM;    \
    if (sub->obits <= 32)                                   \
        memcpy(res, smp, n * sizeof(int32_t));              \
    return subframe_count_exact(s, sub, 0);                 \
}

Definition at line 945 of file flacenc.c.

FLAGS

#define FLAGS   AV_OPT_FLAG_ENCODING_PARAM | AV_OPT_FLAG_AUDIO_PARAM

Definition at line 1712 of file flacenc.c.

Enumeration Type Documentation

CodingMode

enum CodingMode

Enumerator
CODING_MODE_RICE
CODING_MODE_RICE2

Definition at line 51 of file flacenc.c.

Function Documentation

write_streaminfo()

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

static

Write streaminfo metadata block to byte array.

Definition at line 137 of file flacenc.c.

Referenced by flac_encode_frame(), and flac_encode_init().

flac_get_max_frame_size()

static int flac_get_max_frame_size ( int  blocksize, int  ch, int  bps  )

static

Calculate an estimate for the maximum frame size based on verbatim mode.

Parameters

blocksize	block size, in samples
ch	number of channels
bps	bits-per-sample

Definition at line 166 of file flacenc.c.

Referenced by flac_encode_frame(), and flac_encode_init().

select_blocksize()

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 192 of file flacenc.c.

Referenced by flac_encode_init().

dprint_compression_options()

static av_cold void dprint_compression_options ( FlacEncodeContext *  s )

static

Definition at line 211 of file flacenc.c.

Referenced by flac_encode_init().

flac_encode_init()

static av_cold int flac_encode_init ( AVCodecContext *  avctx )

static

Definition at line 269 of file flacenc.c.

init_frame()

static void init_frame ( FlacEncodeContext *  s, int  nb_samples  )

static

Definition at line 478 of file flacenc.c.

Referenced by decode_frame(), and flac_encode_frame().

copy_samples()

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

static

Copy channel-interleaved input samples into separate subframes.

Definition at line 523 of file flacenc.c.

Referenced by flac_encode_frame().

rice_count_exact()

static uint64_t rice_count_exact ( const int32_t *  res, int  n, int  k  )

static

Definition at line 545 of file flacenc.c.

Referenced by subframe_count_exact().

subframe_count_exact()

static uint64_t subframe_count_exact ( FlacEncodeContext *  s, FlacSubframe *  sub, int  pred_order  )

static

Definition at line 558 of file flacenc.c.

Referenced by encode_residual_ch().

find_optimal_param()

static int find_optimal_param ( uint64_t  sum, int  n, int  max_param  )

static

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

Definition at line 613 of file flacenc.c.

Referenced by calc_optimal_rice_params(), and estimate_stereo_mode().

find_optimal_param_exact()

static int find_optimal_param_exact ( uint64_t  sums[32][MAX_PARTITIONS], int  i, int  max_param  )

static

Definition at line 625 of file flacenc.c.

Referenced by calc_optimal_rice_params().

calc_optimal_rice_params()

static uint64_t calc_optimal_rice_params ( RiceContext *  rc, int  porder, uint64_t  sums[32][MAX_PARTITIONS], int  n, int  pred_order, int  max_param, int  exact  )

static

Definition at line 642 of file flacenc.c.

Referenced by calc_rice_params().

calc_sum_top()

static void calc_sum_top ( int  pmax, int  kmax, const uint32_t *  data, int  n, int  pred_order, uint64_t  sums[32][MAX_PARTITIONS]  )

static

Definition at line 672 of file flacenc.c.

Referenced by calc_rice_params().

calc_sum_next()

static void calc_sum_next ( int  level, uint64_t  sums[32][MAX_PARTITIONS], int  kmax  )

static

Definition at line 702 of file flacenc.c.

Referenced by calc_rice_params().

calc_rice_params()

static uint64_t calc_rice_params ( RiceContext *  rc, uint32_t  udata[FLAC_MAX_BLOCKSIZE], uint64_t  sums[32][MAX_PARTITIONS], int  pmin, int  pmax, const int32_t *  data, int  n, int  pred_order, int  exact  )

static

Definition at line 712 of file flacenc.c.

Referenced by find_subframe_rice_params().

get_max_p_order()

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

static

Definition at line 752 of file flacenc.c.

Referenced by find_subframe_rice_params().

find_subframe_rice_params()

static uint64_t find_subframe_rice_params ( FlacEncodeContext *  s, FlacSubframe *  sub, int  pred_order  )

static

Definition at line 761 of file flacenc.c.

Referenced by encode_residual_ch().

encode_residual_fixed()

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

static

Definition at line 778 of file flacenc.c.

Referenced by encode_residual_ch().

encode_residual_fixed_with_residual_limit()

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

static

Definition at line 876 of file flacenc.c.

Referenced by encode_residual_ch().

encode_residual_fixed_with_residual_limit_33bps()

static int encode_residual_fixed_with_residual_limit_33bps ( int32_t *  res, const int64_t *  smp, int  n, int  order  )

static

Definition at line 883 of file flacenc.c.

Referenced by encode_residual_ch().

lpc_encode_with_residual_limit()

static int lpc_encode_with_residual_limit ( int32_t *  res, const int32_t *  smp, int  len, int  order, int32_t *  coefs, int  shift  )

static

Definition at line 906 of file flacenc.c.

Referenced by lpc_encode_choose_datapath().

lpc_encode_with_residual_limit_33bps()

static int lpc_encode_with_residual_limit_33bps ( int32_t *  res, const int64_t *  smp, int  len, int  order, int32_t *  coefs, int  shift  )

static

Definition at line 912 of file flacenc.c.

Referenced by lpc_encode_choose_datapath().

lpc_encode_choose_datapath()

static int lpc_encode_choose_datapath ( FlacEncodeContext *  s, int32_t  bps, int32_t *  res, const int32_t *  smp, const int64_t *  smp_33bps, int  len, int  order, int32_t *  coefs, int  shift  )

static

Definition at line 918 of file flacenc.c.

Referenced by encode_residual_ch().

encode_residual_ch()

static int encode_residual_ch ( FlacEncodeContext *  s, int  ch  )

static

Definition at line 953 of file flacenc.c.

Referenced by encode_frame().

count_frame_header()

static int count_frame_header ( FlacEncodeContext *  s )

static

Definition at line 1173 of file flacenc.c.

Referenced by encode_frame().

encode_frame()

static int encode_frame ( FlacEncodeContext *  s )

static

Definition at line 1209 of file flacenc.c.

Referenced by flac_encode_frame().

remove_wasted_bits()

static void remove_wasted_bits ( FlacEncodeContext *  s )

static

Definition at line 1229 of file flacenc.c.

Referenced by flac_encode_frame().

estimate_stereo_mode()

static int estimate_stereo_mode ( const int32_t *  left_ch, const int32_t *  right_ch, int  n, int  max_rice_param, int  bps  )

static

Definition at line 1283 of file flacenc.c.

Referenced by channel_decorrelation().

channel_decorrelation()

static void channel_decorrelation ( FlacEncodeContext *  s )

static

Perform stereo channel decorrelation.

Definition at line 1339 of file flacenc.c.

Referenced by flac_encode_frame().

write_utf8()

static void write_utf8 ( PutBitContext *  pb, uint32_t  val  )

static

Definition at line 1406 of file flacenc.c.

Referenced by write_frame_header().

write_frame_header()

static void write_frame_header ( FlacEncodeContext *  s )

static

Definition at line 1413 of file flacenc.c.

Referenced by write_frame().

set_sr_golomb_flac()

static void set_sr_golomb_flac ( PutBitContext *  pb, int  i, int  k  )

inlinestatic

Definition at line 1450 of file flacenc.c.

Referenced by write_subframes().

write_subframes()

static void write_subframes ( FlacEncodeContext *  s )

static

Definition at line 1469 of file flacenc.c.

Referenced by write_frame().

write_frame_footer()

static void write_frame_footer ( FlacEncodeContext *  s )

static

Definition at line 1553 of file flacenc.c.

Referenced by write_frame().

write_frame()

static int write_frame ( FlacEncodeContext *  s, AVPacket *  avpkt  )

static

Definition at line 1564 of file flacenc.c.

Referenced by flac_encode_frame().

update_md5_sum()

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

static

Definition at line 1574 of file flacenc.c.

Referenced by flac_encode_frame().

flac_encode_frame()

static int flac_encode_frame ( AVCodecContext *  avctx, AVPacket *  avpkt, const AVFrame *  frame, int *  got_packet_ptr  )

static

Definition at line 1619 of file flacenc.c.

flac_encode_close()

static av_cold int flac_encode_close ( AVCodecContext *  avctx )

static

Definition at line 1702 of file flacenc.c.

Variable Documentation

options

const AVOption options[]

static

Initial value:

= {
{ "lpc_coeff_precision", "LPC coefficient precision", 0x42, AV_OPT_TYPE_INT, {.i64 = 15 }, 0, MAX_LPC_PRECISION, FLAGS },
{ "lpc_type", "LPC algorithm", 0x42, AV_OPT_TYPE_INT, {.i64 = FF_LPC_TYPE_DEFAULT }, FF_LPC_TYPE_DEFAULT, FF_LPC_TYPE_NB-1, FLAGS, .unit = "lpc_type" },
{ "none",     NULL, 0, AV_OPT_TYPE_CONST, {.i64 = FF_LPC_TYPE_NONE },     INT_MIN, INT_MAX, FLAGS, .unit = "lpc_type" },
{ "fixed",    NULL, 0, AV_OPT_TYPE_CONST, {.i64 = FF_LPC_TYPE_FIXED },    INT_MIN, INT_MAX, FLAGS, .unit = "lpc_type" },
{ "levinson", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = FF_LPC_TYPE_LEVINSON }, INT_MIN, INT_MAX, FLAGS, .unit = "lpc_type" },
{ "cholesky", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = FF_LPC_TYPE_CHOLESKY }, INT_MIN, INT_MAX, FLAGS, .unit = "lpc_type" },
{ "lpc_passes", "Number of passes to use for Cholesky factorization during LPC analysis", 0x42,  AV_OPT_TYPE_INT, {.i64 = 2 }, 1, INT_MAX, FLAGS },
{ "min_partition_order",  NULL, 0x42,  AV_OPT_TYPE_INT, {.i64 = -1 },      -1, MAX_PARTITION_ORDER, FLAGS },
{ "max_partition_order",  NULL, 0x42,  AV_OPT_TYPE_INT, {.i64 = -1 },      -1, MAX_PARTITION_ORDER, FLAGS },
{ "prediction_order_method", "Search method for selecting prediction order", 0x42, AV_OPT_TYPE_INT, {.i64 = -1 }, -1, ORDER_METHOD_LOG, FLAGS, .unit = "predm" },
{ "estimation", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = ORDER_METHOD_EST },    INT_MIN, INT_MAX, FLAGS, .unit = "predm" },
{ "2level",     NULL, 0, AV_OPT_TYPE_CONST, {.i64 = ORDER_METHOD_2LEVEL }, INT_MIN, INT_MAX, FLAGS, .unit = "predm" },
{ "4level",     NULL, 0, AV_OPT_TYPE_CONST, {.i64 = ORDER_METHOD_4LEVEL }, INT_MIN, INT_MAX, FLAGS, .unit = "predm" },
{ "8level",     NULL, 0, AV_OPT_TYPE_CONST, {.i64 = ORDER_METHOD_8LEVEL }, INT_MIN, INT_MAX, FLAGS, .unit = "predm" },
{ "search",     NULL, 0, AV_OPT_TYPE_CONST, {.i64 = ORDER_METHOD_SEARCH }, INT_MIN, INT_MAX, FLAGS, .unit = "predm" },
{ "log",        NULL, 0, AV_OPT_TYPE_CONST, {.i64 = ORDER_METHOD_LOG },    INT_MIN, INT_MAX, FLAGS, .unit = "predm" },
{ "ch_mode", "Stereo decorrelation mode", 0x42, AV_OPT_TYPE_INT, { .i64 = -1 }, -1, FLAC_CHMODE_MID_SIDE, FLAGS, .unit = "ch_mode" },
{ "auto",       NULL, 0, AV_OPT_TYPE_CONST, { .i64 = -1                      }, INT_MIN, INT_MAX, FLAGS, .unit = "ch_mode" },
{ "indep",      NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FLAC_CHMODE_INDEPENDENT }, INT_MIN, INT_MAX, FLAGS, .unit = "ch_mode" },
{ "left_side",  NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FLAC_CHMODE_LEFT_SIDE   }, INT_MIN, INT_MAX, FLAGS, .unit = "ch_mode" },
{ "right_side", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FLAC_CHMODE_RIGHT_SIDE  }, INT_MIN, INT_MAX, FLAGS, .unit = "ch_mode" },
{ "mid_side",   NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FLAC_CHMODE_MID_SIDE    }, INT_MIN, INT_MAX, FLAGS, .unit = "ch_mode" },
{ "exact_rice_parameters", "Calculate rice parameters exactly", 0x42, AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, FLAGS },
{ "multi_dim_quant",       "Multi-dimensional quantization",    0x42,       AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, FLAGS },
{ "min_prediction_order", NULL, 0x42, AV_OPT_TYPE_INT, { .i64 = -1 }, -1, MAX_LPC_ORDER, FLAGS },
{ "max_prediction_order", NULL, 0x42, AV_OPT_TYPE_INT, { .i64 = -1 }, -1, MAX_LPC_ORDER, FLAGS },
 
{ NULL },
}

Definition at line 1713 of file flacenc.c.

flac_encoder_class

const AVClass flac_encoder_class

static

Initial value:

= {
    .class_name = "FLAC encoder",
    .item_name  = av_default_item_name,
    .option     = options,
    .version    = LIBAVUTIL_VERSION_INT,
}

Definition at line 1744 of file flacenc.c.

ff_flac_encoder

const FFCodec ff_flac_encoder

Initial value:

= {
    .p.name         = "flac",
    CODEC_LONG_NAME("FLAC (Free Lossless Audio Codec)"),
    .p.type         = AVMEDIA_TYPE_AUDIO,
    .p.id           = AV_CODEC_ID_FLAC,
    .p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_DELAY |
                      AV_CODEC_CAP_SMALL_LAST_FRAME |
                      AV_CODEC_CAP_ENCODER_REORDERED_OPAQUE,
    .priv_data_size = sizeof(FlacEncodeContext),
    .init           = flac_encode_init,
    FF_CODEC_ENCODE_CB(flac_encode_frame),
    .close          = flac_encode_close,
    .p.sample_fmts  = (const enum AVSampleFormat[]){ AV_SAMPLE_FMT_S16,
                                                     AV_SAMPLE_FMT_S32,
                                                     AV_SAMPLE_FMT_NONE },
    .p.priv_class   = &flac_encoder_class,
    .caps_internal  = FF_CODEC_CAP_INIT_CLEANUP | FF_CODEC_CAP_EOF_FLUSH,
}

Definition at line 1751 of file flacenc.c.