making act segmenter

1 files changed, 0 insertions, 1358 deletions

diff --git a/ffmpeg1/libavcodec/flacenc.c b/ffmpeg1/libavcodec/flacenc.c
deleted file mode 100644
index dc932c6..0000000
--- a/ffmpeg1/libavcodec/flacenc.c
+++ /dev/null
@@ -1,1358 +0,0 @@
-/*
- * 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
- */
-
-#include "libavutil/avassert.h"
-#include "libavutil/crc.h"
-#include "libavutil/intmath.h"
-#include "libavutil/md5.h"
-#include "libavutil/opt.h"
-#include "avcodec.h"
-#include "dsputil.h"
-#include "put_bits.h"
-#include "golomb.h"
-#include "internal.h"
-#include "lpc.h"
-#include "flac.h"
-#include "flacdata.h"
-#include "flacdsp.h"
-
-#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 MAX_LPC_SHIFT      15
-
-enum CodingMode {
-    CODING_MODE_RICE  = 4,
-    CODING_MODE_RICE2 = 5,
-};
-
-typedef struct CompressionOptions {
-    int compression_level;
-    int block_time_ms;
-    enum FFLPCType lpc_type;
-    int lpc_passes;
-    int lpc_coeff_precision;
-    int min_prediction_order;
-    int max_prediction_order;
-    int prediction_order_method;
-    int min_partition_order;
-    int max_partition_order;
-    int ch_mode;
-} CompressionOptions;
-
-typedef struct RiceContext {
-    enum CodingMode coding_mode;
-    int porder;
-    int params[MAX_PARTITIONS];
-} RiceContext;
-
-typedef struct FlacSubframe {
-    int type;
-    int type_code;
-    int obits;
-    int wasted;
-    int order;
-    int32_t coefs[MAX_LPC_ORDER];
-    int shift;
-    RiceContext rc;
-    int32_t samples[FLAC_MAX_BLOCKSIZE];
-    int32_t residual[FLAC_MAX_BLOCKSIZE+1];
-} FlacSubframe;
-
-typedef struct FlacFrame {
-    FlacSubframe subframes[FLAC_MAX_CHANNELS];
-    int blocksize;
-    int bs_code[2];
-    uint8_t crc8;
-    int ch_mode;
-    int verbatim_only;
-} FlacFrame;
-
-typedef struct FlacEncodeContext {
-    AVClass *class;
-    PutBitContext pb;
-    int channels;
-    int samplerate;
-    int sr_code[2];
-    int bps_code;
-    int max_blocksize;
-    int min_framesize;
-    int max_framesize;
-    int max_encoded_framesize;
-    uint32_t frame_count;
-    uint64_t sample_count;
-    uint8_t md5sum[16];
-    FlacFrame frame;
-    CompressionOptions options;
-    AVCodecContext *avctx;
-    LPCContext lpc_ctx;
-    struct AVMD5 *md5ctx;
-    uint8_t *md5_buffer;
-    unsigned int md5_buffer_size;
-    DSPContext dsp;
-    FLACDSPContext flac_dsp;
-} FlacEncodeContext;
-
-
-/**
- * Write streaminfo metadata block to byte array.
- */
-static void write_streaminfo(FlacEncodeContext *s, uint8_t *header)
-{
-    PutBitContext pb;
-
-    memset(header, 0, FLAC_STREAMINFO_SIZE);
-    init_put_bits(&pb, header, FLAC_STREAMINFO_SIZE);
-
-    /* streaminfo metadata block */
-    put_bits(&pb, 16, s->max_blocksize);
-    put_bits(&pb, 16, s->max_blocksize);
-    put_bits(&pb, 24, s->min_framesize);
-    put_bits(&pb, 24, s->max_framesize);
-    put_bits(&pb, 20, s->samplerate);
-    put_bits(&pb, 3, s->channels-1);
-    put_bits(&pb,  5, s->avctx->bits_per_raw_sample - 1);
-    /* write 36-bit sample count in 2 put_bits() calls */
-    put_bits(&pb, 24, (s->sample_count & 0xFFFFFF000LL) >> 12);
-    put_bits(&pb, 12,  s->sample_count & 0x000000FFFLL);
-    flush_put_bits(&pb);
-    memcpy(&header[18], s->md5sum, 16);
-}
-
-
-/**
- * Set blocksize based on samplerate.
- * Choose the closest predefined blocksize >= BLOCK_TIME_MS milliseconds.
- */
-static int select_blocksize(int samplerate, int block_time_ms)
-{
-    int i;
-    int target;
-    int blocksize;
-
-    av_assert0(samplerate > 0);
-    blocksize = ff_flac_blocksize_table[1];
-    target    = (samplerate * block_time_ms) / 1000;
-    for (i = 0; i < 16; i++) {
-        if (target >= ff_flac_blocksize_table[i] &&
-            ff_flac_blocksize_table[i] > blocksize) {
-            blocksize = ff_flac_blocksize_table[i];
-        }
-    }
-    return blocksize;
-}
-
-
-static av_cold void dprint_compression_options(FlacEncodeContext *s)
-{
-    AVCodecContext     *avctx = s->avctx;
-    CompressionOptions *opt   = &s->options;
-
-    av_log(avctx, AV_LOG_DEBUG, " compression: %d\n", opt->compression_level);
-
-    switch (opt->lpc_type) {
-    case FF_LPC_TYPE_NONE:
-        av_log(avctx, AV_LOG_DEBUG, " lpc type: None\n");
-        break;
-    case FF_LPC_TYPE_FIXED:
-        av_log(avctx, AV_LOG_DEBUG, " lpc type: Fixed pre-defined coefficients\n");
-        break;
-    case FF_LPC_TYPE_LEVINSON:
-        av_log(avctx, AV_LOG_DEBUG, " lpc type: Levinson-Durbin recursion with Welch window\n");
-        break;
-    case FF_LPC_TYPE_CHOLESKY:
-        av_log(avctx, AV_LOG_DEBUG, " lpc type: Cholesky factorization, %d pass%s\n",
-               opt->lpc_passes, opt->lpc_passes == 1 ? "" : "es");
-        break;
-    }
-
-    av_log(avctx, AV_LOG_DEBUG, " prediction order: %d, %d\n",
-           opt->min_prediction_order, opt->max_prediction_order);
-
-    switch (opt->prediction_order_method) {
-    case ORDER_METHOD_EST:
-        av_log(avctx, AV_LOG_DEBUG, " order method: %s\n", "estimate");
-        break;
-    case ORDER_METHOD_2LEVEL:
-        av_log(avctx, AV_LOG_DEBUG, " order method: %s\n", "2-level");
-        break;
-    case ORDER_METHOD_4LEVEL:
-        av_log(avctx, AV_LOG_DEBUG, " order method: %s\n", "4-level");
-        break;
-    case ORDER_METHOD_8LEVEL:
-        av_log(avctx, AV_LOG_DEBUG, " order method: %s\n", "8-level");
-        break;
-    case ORDER_METHOD_SEARCH:
-        av_log(avctx, AV_LOG_DEBUG, " order method: %s\n", "full search");
-        break;
-    case ORDER_METHOD_LOG:
-        av_log(avctx, AV_LOG_DEBUG, " order method: %s\n", "log search");
-        break;
-    }
-
-
-    av_log(avctx, AV_LOG_DEBUG, " partition order: %d, %d\n",
-           opt->min_partition_order, opt->max_partition_order);
-
-    av_log(avctx, AV_LOG_DEBUG, " block size: %d\n", avctx->frame_size);
-
-    av_log(avctx, AV_LOG_DEBUG, " lpc precision: %d\n",
-           opt->lpc_coeff_precision);
-}
-
-
-static av_cold int flac_encode_init(AVCodecContext *avctx)
-{
-    int freq = avctx->sample_rate;
-    int channels = avctx->channels;
-    FlacEncodeContext *s = avctx->priv_data;
-    int i, level, ret;
-    uint8_t *streaminfo;
-
-    s->avctx = avctx;
-
-    switch (avctx->sample_fmt) {
-    case AV_SAMPLE_FMT_S16:
-        avctx->bits_per_raw_sample = 16;
-        s->bps_code                = 4;
-        break;
-    case AV_SAMPLE_FMT_S32:
-        if (avctx->bits_per_raw_sample != 24)
-            av_log(avctx, AV_LOG_WARNING, "encoding as 24 bits-per-sample\n");
-        avctx->bits_per_raw_sample = 24;
-        s->bps_code                = 6;
-        break;
-    }
-
-    if (channels < 1 || channels > FLAC_MAX_CHANNELS) {
-        av_log(avctx, AV_LOG_ERROR, "%d channels not supported (max %d)\n",
-               channels, FLAC_MAX_CHANNELS);
-        return AVERROR(EINVAL);
-    }
-    s->channels = channels;
-
-    /* find samplerate in table */
-    if (freq < 1)
-        return -1;
-    for (i = 4; i < 12; i++) {
-        if (freq == ff_flac_sample_rate_table[i]) {
-            s->samplerate = ff_flac_sample_rate_table[i];
-            s->sr_code[0] = i;
-            s->sr_code[1] = 0;
-            break;
-        }
-    }
-    /* if not in table, samplerate is non-standard */
-    if (i == 12) {
-        if (freq % 1000 == 0 && freq < 255000) {
-            s->sr_code[0] = 12;
-            s->sr_code[1] = freq / 1000;
-        } else if (freq % 10 == 0 && freq < 655350) {
-            s->sr_code[0] = 14;
-            s->sr_code[1] = freq / 10;
-        } else if (freq < 65535) {
-            s->sr_code[0] = 13;
-            s->sr_code[1] = freq;
-        } else {
-            av_log(avctx, AV_LOG_ERROR, "%d Hz not supported\n", freq);
-            return AVERROR(EINVAL);
-        }
-        s->samplerate = freq;
-    }
-
-    /* set compression option defaults based on avctx->compression_level */
-    if (avctx->compression_level < 0)
-        s->options.compression_level = 5;
-    else
-        s->options.compression_level = avctx->compression_level;
-
-    level = s->options.compression_level;
-    if (level > 12) {
-        av_log(avctx, AV_LOG_ERROR, "invalid compression level: %d\n",
-               s->options.compression_level);
-        return AVERROR(EINVAL);
-    }
-
-    s->options.block_time_ms = ((int[]){ 27, 27, 27,105,105,105,105,105,105,105,105,105,105})[level];
-
-    if (s->options.lpc_type == FF_LPC_TYPE_DEFAULT)
-        s->options.lpc_type  = ((int[]){ FF_LPC_TYPE_FIXED,    FF_LPC_TYPE_FIXED,    FF_LPC_TYPE_FIXED,
-                                         FF_LPC_TYPE_LEVINSON, FF_LPC_TYPE_LEVINSON, FF_LPC_TYPE_LEVINSON,
-                                         FF_LPC_TYPE_LEVINSON, FF_LPC_TYPE_LEVINSON, FF_LPC_TYPE_LEVINSON,
-                                         FF_LPC_TYPE_LEVINSON, FF_LPC_TYPE_LEVINSON, FF_LPC_TYPE_LEVINSON,
-                                         FF_LPC_TYPE_LEVINSON})[level];
-
-    s->options.min_prediction_order = ((int[]){  2,  0,  0,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1})[level];
-    s->options.max_prediction_order = ((int[]){  3,  4,  4,  6,  8,  8,  8,  8, 12, 12, 12, 32, 32})[level];
-
-    if (s->options.prediction_order_method < 0)
-        s->options.prediction_order_method = ((int[]){ ORDER_METHOD_EST,    ORDER_METHOD_EST,    ORDER_METHOD_EST,
-                                                       ORDER_METHOD_EST,    ORDER_METHOD_EST,    ORDER_METHOD_EST,
-                                                       ORDER_METHOD_4LEVEL, ORDER_METHOD_LOG,    ORDER_METHOD_4LEVEL,
-                                                       ORDER_METHOD_LOG,    ORDER_METHOD_SEARCH, ORDER_METHOD_LOG,
-                                                       ORDER_METHOD_SEARCH})[level];
-
-    if (s->options.min_partition_order > s->options.max_partition_order) {
-        av_log(avctx, AV_LOG_ERROR, "invalid partition orders: min=%d max=%d\n",
-               s->options.min_partition_order, s->options.max_partition_order);
-        return AVERROR(EINVAL);
-    }
-    if (s->options.min_partition_order < 0)
-        s->options.min_partition_order = ((int[]){  2,  2,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0})[level];
-    if (s->options.max_partition_order < 0)
-        s->options.max_partition_order = ((int[]){  2,  2,  3,  3,  3,  8,  8,  8,  8,  8,  8,  8,  8})[level];
-
-    if (s->options.lpc_type == FF_LPC_TYPE_NONE) {
-        s->options.min_prediction_order = 0;
-    } else if (avctx->min_prediction_order >= 0) {
-        if (s->options.lpc_type == FF_LPC_TYPE_FIXED) {
-            if (avctx->min_prediction_order > MAX_FIXED_ORDER) {
-                av_log(avctx, AV_LOG_ERROR, "invalid min prediction order: %d\n",
-                       avctx->min_prediction_order);
-                return AVERROR(EINVAL);
-            }
-        } else if (avctx->min_prediction_order < MIN_LPC_ORDER ||
-                   avctx->min_prediction_order > MAX_LPC_ORDER) {
-            av_log(avctx, AV_LOG_ERROR, "invalid min prediction order: %d\n",
-                   avctx->min_prediction_order);
-            return AVERROR(EINVAL);
-        }
-        s->options.min_prediction_order = avctx->min_prediction_order;
-    }
-    if (s->options.lpc_type == FF_LPC_TYPE_NONE) {
-        s->options.max_prediction_order = 0;
-    } else if (avctx->max_prediction_order >= 0) {
-        if (s->options.lpc_type == FF_LPC_TYPE_FIXED) {
-            if (avctx->max_prediction_order > MAX_FIXED_ORDER) {
-                av_log(avctx, AV_LOG_ERROR, "invalid max prediction order: %d\n",
-                       avctx->max_prediction_order);
-                return AVERROR(EINVAL);
-            }
-        } else if (avctx->max_prediction_order < MIN_LPC_ORDER ||
-                   avctx->max_prediction_order > MAX_LPC_ORDER) {
-            av_log(avctx, AV_LOG_ERROR, "invalid max prediction order: %d\n",
-                   avctx->max_prediction_order);
-            return AVERROR(EINVAL);
-        }
-        s->options.max_prediction_order = avctx->max_prediction_order;
-    }
-    if (s->options.max_prediction_order < s->options.min_prediction_order) {
-        av_log(avctx, AV_LOG_ERROR, "invalid prediction orders: min=%d max=%d\n",
-               s->options.min_prediction_order, s->options.max_prediction_order);
-        return AVERROR(EINVAL);
-    }
-
-    if (avctx->frame_size > 0) {
-        if (avctx->frame_size < FLAC_MIN_BLOCKSIZE ||
-                avctx->frame_size > FLAC_MAX_BLOCKSIZE) {
-            av_log(avctx, AV_LOG_ERROR, "invalid block size: %d\n",
-                   avctx->frame_size);
-            return AVERROR(EINVAL);
-        }
-    } else {
-        s->avctx->frame_size = select_blocksize(s->samplerate, s->options.block_time_ms);
-    }
-    s->max_blocksize = s->avctx->frame_size;
-
-    /* set maximum encoded frame size in verbatim mode */
-    s->max_framesize = ff_flac_get_max_frame_size(s->avctx->frame_size,
-                                                  s->channels,
-                                                  s->avctx->bits_per_raw_sample);
-
-    /* initialize MD5 context */
-    s->md5ctx = av_md5_alloc();
-    if (!s->md5ctx)
-        return AVERROR(ENOMEM);
-    av_md5_init(s->md5ctx);
-
-    streaminfo = av_malloc(FLAC_STREAMINFO_SIZE);
-    if (!streaminfo)
-        return AVERROR(ENOMEM);
-    write_streaminfo(s, streaminfo);
-    avctx->extradata = streaminfo;
-    avctx->extradata_size = FLAC_STREAMINFO_SIZE;
-
-    s->frame_count   = 0;
-    s->min_framesize = s->max_framesize;
-
-    if (channels == 3 &&
-            avctx->channel_layout != (AV_CH_LAYOUT_STEREO|AV_CH_FRONT_CENTER) ||
-        channels == 4 &&
-            avctx->channel_layout != AV_CH_LAYOUT_2_2 &&
-            avctx->channel_layout != AV_CH_LAYOUT_QUAD ||
-        channels == 5 &&
-            avctx->channel_layout != AV_CH_LAYOUT_5POINT0 &&
-            avctx->channel_layout != AV_CH_LAYOUT_5POINT0_BACK ||
-        channels == 6 &&
-            avctx->channel_layout != AV_CH_LAYOUT_5POINT1 &&
-            avctx->channel_layout != AV_CH_LAYOUT_5POINT1_BACK) {
-        if (avctx->channel_layout) {
-            av_log(avctx, AV_LOG_ERROR, "Channel layout not supported by Flac, "
-                                             "output stream will have incorrect "
-                                             "channel layout.\n");
-        } else {
-            av_log(avctx, AV_LOG_WARNING, "No channel layout specified. The encoder "
-                                               "will use Flac channel layout for "
-                                               "%d channels.\n", channels);
-        }
-    }
-
-    ret = ff_lpc_init(&s->lpc_ctx, avctx->frame_size,
-                      s->options.max_prediction_order, FF_LPC_TYPE_LEVINSON);
-
-    ff_dsputil_init(&s->dsp, avctx);
-    ff_flacdsp_init(&s->flac_dsp, avctx->sample_fmt,
-                    avctx->bits_per_raw_sample);
-
-    dprint_compression_options(s);
-
-    return ret;
-}
-
-
-static void init_frame(FlacEncodeContext *s, int nb_samples)
-{
-    int i, ch;
-    FlacFrame *frame;
-
-    frame = &s->frame;
-
-    for (i = 0; i < 16; i++) {
-        if (nb_samples == ff_flac_blocksize_table[i]) {
-            frame->blocksize  = ff_flac_blocksize_table[i];
-            frame->bs_code[0] = i;
-            frame->bs_code[1] = 0;
-            break;
-        }
-    }
-    if (i == 16) {
-        frame->blocksize = nb_samples;
-        if (frame->blocksize <= 256) {
-            frame->bs_code[0] = 6;
-            frame->bs_code[1] = frame->blocksize-1;
-        } else {
-            frame->bs_code[0] = 7;
-            frame->bs_code[1] = frame->blocksize-1;
-        }
-    }
-
-    for (ch = 0; ch < s->channels; ch++) {
-        FlacSubframe *sub = &frame->subframes[ch];
-
-        sub->wasted = 0;
-        sub->obits  = s->avctx->bits_per_raw_sample;
-
-        if (sub->obits > 16)
-            sub->rc.coding_mode = CODING_MODE_RICE2;
-        else
-            sub->rc.coding_mode = CODING_MODE_RICE;
-    }
-
-    frame->verbatim_only = 0;
-}
-
-
-/**
- * Copy channel-interleaved input samples into separate subframes.
- */
-static void copy_samples(FlacEncodeContext *s, const void *samples)
-{
-    int i, j, ch;
-    FlacFrame *frame;
-    int shift = av_get_bytes_per_sample(s->avctx->sample_fmt) * 8 -
-                s->avctx->bits_per_raw_sample;
-
-#define COPY_SAMPLES(bits) 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)
-
-    if (s->avctx->sample_fmt == AV_SAMPLE_FMT_S16)
-        COPY_SAMPLES(16);
-    else
-        COPY_SAMPLES(32);
-}
-
-
-static uint64_t rice_count_exact(int32_t *res, int n, int k)
-{
-    int i;
-    uint64_t count = 0;
-
-    for (i = 0; i < n; i++) {
-        int32_t v = -2 * res[i] - 1;
-        v ^= v >> 31;
-        count += (v >> k) + 1 + k;
-    }
-    return count;
-}
-
-
-static uint64_t subframe_count_exact(FlacEncodeContext *s, FlacSubframe *sub,
-                                     int pred_order)
-{
-    int p, porder, psize;
-    int i, part_end;
-    uint64_t count = 0;
-
-    /* subframe header */
-    count += 8;
-
-    /* subframe */
-    if (sub->type == FLAC_SUBFRAME_CONSTANT) {
-        count += sub->obits;
-    } else if (sub->type == FLAC_SUBFRAME_VERBATIM) {
-        count += s->frame.blocksize * sub->obits;
-    } else {
-        /* warm-up samples */
-        count += pred_order * sub->obits;
-
-        /* LPC coefficients */
-        if (sub->type == FLAC_SUBFRAME_LPC)
-            count += 4 + 5 + pred_order * s->options.lpc_coeff_precision;
-
-        /* rice-encoded block */
-        count += 2;
-
-        /* partition order */
-        porder = sub->rc.porder;
-        psize  = s->frame.blocksize >> porder;
-        count += 4;
-
-        /* residual */
-        i        = pred_order;
-        part_end = psize;
-        for (p = 0; p < 1 << porder; p++) {
-            int k = sub->rc.params[p];
-            count += sub->rc.coding_mode;
-            count += rice_count_exact(&sub->residual[i], part_end - i, k);
-            i = part_end;
-            part_end = FFMIN(s->frame.blocksize, part_end + psize);
-        }
-    }
-
-    return count;
-}
-
-
-#define rice_encode_count(sum, n, k) (((n)*((k)+1))+((sum-(n>>1))>>(k)))
-
-/**
- * Solve for d/dk(rice_encode_count) = n-((sum-(n>>1))>>(k+1)) = 0.
- */
-static int find_optimal_param(uint64_t sum, int n, int max_param)
-{
-    int k;
-    uint64_t sum2;
-
-    if (sum <= n >> 1)
-        return 0;
-    sum2 = sum - (n >> 1);
-    k    = av_log2(av_clipl_int32(sum2 / n));
-    return FFMIN(k, max_param);
-}
-
-
-static uint64_t calc_optimal_rice_params(RiceContext *rc, int porder,
-                                         uint64_t *sums, int n, int pred_order)
-{
-    int i;
-    int k, cnt, part, max_param;
-    uint64_t all_bits;
-
-    max_param = (1 << rc->coding_mode) - 2;
-
-    part     = (1 << porder);
-    all_bits = 4 * part;
-
-    cnt = (n >> porder) - pred_order;
-    for (i = 0; i < part; i++) {
-        k = find_optimal_param(sums[i], cnt, max_param);
-        rc->params[i] = k;
-        all_bits += rice_encode_count(sums[i], cnt, k);
-        cnt = n >> porder;
-    }
-
-    rc->porder = porder;
-
-    return all_bits;
-}
-
-
-static void calc_sums(int pmin, int pmax, uint32_t *data, int n, int pred_order,
-                      uint64_t sums[][MAX_PARTITIONS])
-{
-    int i, j;
-    int parts;
-    uint32_t *res, *res_end;
-
-    /* sums for highest level */
-    parts   = (1 << pmax);
-    res     = &data[pred_order];
-    res_end = &data[n >> pmax];
-    for (i = 0; i < parts; i++) {
-        uint64_t sum = 0;
-        while (res < res_end)
-            sum += *(res++);
-        sums[pmax][i] = sum;
-        res_end += n >> pmax;
-    }
-    /* sums for lower levels */
-    for (i = pmax - 1; i >= pmin; i--) {
-        parts = (1 << i);
-        for (j = 0; j < parts; j++)
-            sums[i][j] = sums[i+1][2*j] + sums[i+1][2*j+1];
-    }
-}
-
-
-static uint64_t calc_rice_params(RiceContext *rc, int pmin, int pmax,
-                                 int32_t *data, int n, int pred_order)
-{
-    int i;
-    uint64_t bits[MAX_PARTITION_ORDER+1];
-    int opt_porder;
-    RiceContext tmp_rc;
-    uint32_t *udata;
-    uint64_t sums[MAX_PARTITION_ORDER+1][MAX_PARTITIONS];
-
-    av_assert1(pmin >= 0 && pmin <= MAX_PARTITION_ORDER);
-    av_assert1(pmax >= 0 && pmax <= MAX_PARTITION_ORDER);
-    av_assert1(pmin <= pmax);
-
-    tmp_rc.coding_mode = rc->coding_mode;
-
-    udata = av_malloc(n * sizeof(uint32_t));
-    for (i = 0; i < n; i++)
-        udata[i] = (2*data[i]) ^ (data[i]>>31);
-
-    calc_sums(pmin, pmax, udata, n, pred_order, sums);
-
-    opt_porder = pmin;
-    bits[pmin] = UINT32_MAX;
-    for (i = pmin; i <= pmax; i++) {
-        bits[i] = calc_optimal_rice_params(&tmp_rc, i, sums[i], n, pred_order);
-        if (bits[i] <= bits[opt_porder]) {
-            opt_porder = i;
-            *rc = tmp_rc;
-        }
-    }
-
-    av_freep(&udata);
-    return bits[opt_porder];
-}
-
-
-static int get_max_p_order(int max_porder, int n, int order)
-{
-    int porder = FFMIN(max_porder, av_log2(n^(n-1)));
-    if (order > 0)
-        porder = FFMIN(porder, av_log2(n/order));
-    return porder;
-}
-
-
-static uint64_t find_subframe_rice_params(FlacEncodeContext *s,
-                                          FlacSubframe *sub, int pred_order)
-{
-    int pmin = get_max_p_order(s->options.min_partition_order,
-                               s->frame.blocksize, pred_order);
-    int pmax = get_max_p_order(s->options.max_partition_order,
-                               s->frame.blocksize, pred_order);
-
-    uint64_t bits = 8 + pred_order * sub->obits + 2 + sub->rc.coding_mode;
-    if (sub->type == FLAC_SUBFRAME_LPC)
-        bits += 4 + 5 + pred_order * s->options.lpc_coeff_precision;
-    bits += calc_rice_params(&sub->rc, pmin, pmax, sub->residual,
-                             s->frame.blocksize, pred_order);
-    return bits;
-}
-
-
-static void encode_residual_fixed(int32_t *res, const int32_t *smp, int n,
-                                  int order)
-{
-    int i;
-
-    for (i = 0; i < order; i++)
-        res[i] = smp[i];
-
-    if (order == 0) {
-        for (i = order; i < n; i++)
-            res[i] = smp[i];
-    } else if (order == 1) {
-        for (i = order; i < n; i++)
-            res[i] = smp[i] - smp[i-1];
-    } else if (order == 2) {
-        int a = smp[order-1] - smp[order-2];
-        for (i = order; i < n; i += 2) {
-            int b    = smp[i  ] - smp[i-1];
-            res[i]   = b - a;
-            a        = smp[i+1] - smp[i  ];
-            res[i+1] = a - b;
-        }
-    } else if (order == 3) {
-        int a = smp[order-1] -   smp[order-2];
-        int c = smp[order-1] - 2*smp[order-2] + smp[order-3];
-        for (i = order; i < n; i += 2) {
-            int b    = smp[i  ] - smp[i-1];
-            int d    = b - a;
-            res[i]   = d - c;
-            a        = smp[i+1] - smp[i  ];
-            c        = a - b;
-            res[i+1] = c - d;
-        }
-    } else {
-        int a = smp[order-1] -   smp[order-2];
-        int c = smp[order-1] - 2*smp[order-2] +   smp[order-3];
-        int e = smp[order-1] - 3*smp[order-2] + 3*smp[order-3] - smp[order-4];
-        for (i = order; i < n; i += 2) {
-            int b    = smp[i  ] - smp[i-1];
-            int d    = b - a;
-            int f    = d - c;
-            res[i  ] = f - e;
-            a        = smp[i+1] - smp[i  ];
-            c        = a - b;
-            e        = c - d;
-            res[i+1] = e - f;
-        }
-    }
-}
-
-
-static int encode_residual_ch(FlacEncodeContext *s, int ch)
-{
-    int i, n;
-    int min_order, max_order, opt_order, omethod;
-    FlacFrame *frame;
-    FlacSubframe *sub;
-    int32_t coefs[MAX_LPC_ORDER][MAX_LPC_ORDER];
-    int shift[MAX_LPC_ORDER];
-    int32_t *res, *smp;
-
-    frame = &s->frame;
-    sub   = &frame->subframes[ch];
-    res   = sub->residual;
-    smp   = sub->samples;
-    n     = frame->blocksize;
-
-    /* CONSTANT */
-    for (i = 1; i < n; i++)
-        if(smp[i] != smp[0])
-            break;
-    if (i == n) {
-        sub->type = sub->type_code = FLAC_SUBFRAME_CONSTANT;
-        res[0] = smp[0];
-        return subframe_count_exact(s, sub, 0);
-    }
-
-    /* VERBATIM */
-    if (frame->verbatim_only || n < 5) {
-        sub->type = sub->type_code = FLAC_SUBFRAME_VERBATIM;
-        memcpy(res, smp, n * sizeof(int32_t));
-        return subframe_count_exact(s, sub, 0);
-    }
-
-    min_order  = s->options.min_prediction_order;
-    max_order  = s->options.max_prediction_order;
-    omethod    = s->options.prediction_order_method;
-
-    /* FIXED */
-    sub->type = FLAC_SUBFRAME_FIXED;
-    if (s->options.lpc_type == FF_LPC_TYPE_NONE  ||
-        s->options.lpc_type == FF_LPC_TYPE_FIXED || n <= max_order) {
-        uint64_t bits[MAX_FIXED_ORDER+1];
-        if (max_order > MAX_FIXED_ORDER)
-            max_order = MAX_FIXED_ORDER;
-        opt_order = 0;
-        bits[0]   = UINT32_MAX;
-        for (i = min_order; i <= max_order; i++) {
-            encode_residual_fixed(res, smp, n, i);
-            bits[i] = find_subframe_rice_params(s, sub, i);
-            if (bits[i] < bits[opt_order])
-                opt_order = i;
-        }
-        sub->order     = opt_order;
-        sub->type_code = sub->type | sub->order;
-        if (sub->order != max_order) {
-            encode_residual_fixed(res, smp, n, sub->order);
-            find_subframe_rice_params(s, sub, sub->order);
-        }
-        return subframe_count_exact(s, sub, sub->order);
-    }
-
-    /* LPC */
-    sub->type = FLAC_SUBFRAME_LPC;
-    opt_order = ff_lpc_calc_coefs(&s->lpc_ctx, smp, n, min_order, max_order,
-                                  s->options.lpc_coeff_precision, coefs, shift, s->options.lpc_type,
-                                  s->options.lpc_passes, omethod,
-                                  MAX_LPC_SHIFT, 0);
-
-    if (omethod == ORDER_METHOD_2LEVEL ||
-        omethod == ORDER_METHOD_4LEVEL ||
-        omethod == ORDER_METHOD_8LEVEL) {
-        int levels = 1 << omethod;
-        uint64_t bits[1 << ORDER_METHOD_8LEVEL];
-        int order       = -1;
-        int opt_index   = levels-1;
-        opt_order       = max_order-1;
-        bits[opt_index] = UINT32_MAX;
-        for (i = levels-1; i >= 0; i--) {
-            int last_order = order;
-            order = min_order + (((max_order-min_order+1) * (i+1)) / levels)-1;
-            order = av_clip(order, min_order - 1, max_order - 1);
-            if (order == last_order)
-                continue;
-            s->flac_dsp.lpc_encode(res, smp, n, order+1, coefs[order],
-                                   shift[order]);
-            bits[i] = find_subframe_rice_params(s, sub, order+1);
-            if (bits[i] < bits[opt_index]) {
-                opt_index = i;
-                opt_order = order;
-            }
-        }
-        opt_order++;
-    } else if (omethod == ORDER_METHOD_SEARCH) {
-        // brute-force optimal order search
-        uint64_t bits[MAX_LPC_ORDER];
-        opt_order = 0;
-        bits[0]   = UINT32_MAX;
-        for (i = min_order-1; i < max_order; i++) {
-            s->flac_dsp.lpc_encode(res, smp, n, i+1, coefs[i], shift[i]);
-            bits[i] = find_subframe_rice_params(s, sub, i+1);
-            if (bits[i] < bits[opt_order])
-                opt_order = i;
-        }
-        opt_order++;
-    } else if (omethod == ORDER_METHOD_LOG) {
-        uint64_t bits[MAX_LPC_ORDER];
-        int step;
-
-        opt_order = min_order - 1 + (max_order-min_order)/3;
-        memset(bits, -1, sizeof(bits));
-
-        for (step = 16; step; step >>= 1) {
-            int last = opt_order;
-            for (i = last-step; i <= last+step; i += step) {
-                if (i < min_order-1 || i >= max_order || bits[i] < UINT32_MAX)
-                    continue;
-                s->flac_dsp.lpc_encode(res, smp, n, i+1, coefs[i], shift[i]);
-                bits[i] = find_subframe_rice_params(s, sub, i+1);
-                if (bits[i] < bits[opt_order])
-                    opt_order = i;
-            }
-        }
-        opt_order++;
-    }
-
-    sub->order     = opt_order;
-    sub->type_code = sub->type | (sub->order-1);
-    sub->shift     = shift[sub->order-1];
-    for (i = 0; i < sub->order; i++)
-        sub->coefs[i] = coefs[sub->order-1][i];
-
-    s->flac_dsp.lpc_encode(res, smp, n, sub->order, sub->coefs, sub->shift);
-
-    find_subframe_rice_params(s, sub, sub->order);
-
-    return subframe_count_exact(s, sub, sub->order);
-}
-
-
-static int count_frame_header(FlacEncodeContext *s)
-{
-    uint8_t av_unused tmp;
-    int count;
-
-    /*
-    <14> Sync code
-    <1>  Reserved
-    <1>  Blocking strategy
-    <4>  Block size in inter-channel samples
-    <4>  Sample rate
-    <4>  Channel assignment
-    <3>  Sample size in bits
-    <1>  Reserved
-    */
-    count = 32;
-
-    /* coded frame number */
-    PUT_UTF8(s->frame_count, tmp, count += 8;)
-
-    /* explicit block size */
-    if (s->frame.bs_code[0] == 6)
-        count += 8;
-    else if (s->frame.bs_code[0] == 7)
-        count += 16;
-
-    /* explicit sample rate */
-    count += ((s->sr_code[0] == 12) + (s->sr_code[0] > 12)) * 8;
-
-    /* frame header CRC-8 */
-    count += 8;
-
-    return count;
-}
-
-
-static int encode_frame(FlacEncodeContext *s)
-{
-    int ch;
-    uint64_t count;
-
-    count = count_frame_header(s);
-
-    for (ch = 0; ch < s->channels; ch++)
-        count += encode_residual_ch(s, ch);
-
-    count += (8 - (count & 7)) & 7; // byte alignment
-    count += 16;                    // CRC-16
-
-    count >>= 3;
-    if (count > INT_MAX)
-        return AVERROR_BUG;
-    return count;
-}
-
-
-static void remove_wasted_bits(FlacEncodeContext *s)
-{
-    int ch, i;
-
-    for (ch = 0; ch < s->channels; ch++) {
-        FlacSubframe *sub = &s->frame.subframes[ch];
-        int32_t v         = 0;
-
-        for (i = 0; i < s->frame.blocksize; i++) {
-            v |= sub->samples[i];
-            if (v & 1)
-                break;
-        }
-
-        if (v && !(v & 1)) {
-            v = av_ctz(v);
-
-            for (i = 0; i < s->frame.blocksize; i++)
-                sub->samples[i] >>= v;
-
-            sub->wasted = v;
-            sub->obits -= v;
-
-            /* for 24-bit, check if removing wasted bits makes the range better
-               suited for using RICE instead of RICE2 for entropy coding */
-            if (sub->obits <= 17)
-                sub->rc.coding_mode = CODING_MODE_RICE;
-        }
-    }
-}
-
-
-static int estimate_stereo_mode(int32_t *left_ch, int32_t *right_ch, int n,
-                                int max_rice_param)
-{
-    int i, best;
-    int32_t lt, rt;
-    uint64_t sum[4];
-    uint64_t score[4];
-    int k;
-
-    /* calculate sum of 2nd order residual for each channel */
-    sum[0] = sum[1] = sum[2] = sum[3] = 0;
-    for (i = 2; i < n; i++) {
-        lt = left_ch[i]  - 2*left_ch[i-1]  + left_ch[i-2];
-        rt = right_ch[i] - 2*right_ch[i-1] + right_ch[i-2];
-        sum[2] += FFABS((lt + rt) >> 1);
-        sum[3] += FFABS(lt - rt);
-        sum[0] += FFABS(lt);
-        sum[1] += FFABS(rt);
-    }
-    /* estimate bit counts */
-    for (i = 0; i < 4; i++) {
-        k      = find_optimal_param(2 * sum[i], n, max_rice_param);
-        sum[i] = rice_encode_count( 2 * sum[i], n, k);
-    }
-
-    /* calculate score for each mode */
-    score[0] = sum[0] + sum[1];
-    score[1] = sum[0] + sum[3];
-    score[2] = sum[1] + sum[3];
-    score[3] = sum[2] + sum[3];
-
-    /* return mode with lowest score */
-    best = 0;
-    for (i = 1; i < 4; i++)
-        if (score[i] < score[best])
-            best = i;
-
-    return best;
-}
-
-
-/**
- * Perform stereo channel decorrelation.
- */
-static void channel_decorrelation(FlacEncodeContext *s)
-{
-    FlacFrame *frame;
-    int32_t *left, *right;
-    int i, n;
-
-    frame = &s->frame;
-    n     = frame->blocksize;
-    left  = frame->subframes[0].samples;
-    right = frame->subframes[1].samples;
-
-    if (s->channels != 2) {
-        frame->ch_mode = FLAC_CHMODE_INDEPENDENT;
-        return;
-    }
-
-    if (s->options.ch_mode < 0) {
-        int max_rice_param = (1 << frame->subframes[0].rc.coding_mode) - 2;
-        frame->ch_mode = estimate_stereo_mode(left, right, n, max_rice_param);
-    } else
-        frame->ch_mode = s->options.ch_mode;
-
-    /* perform decorrelation and adjust bits-per-sample */
-    if (frame->ch_mode == FLAC_CHMODE_INDEPENDENT)
-        return;
-    if (frame->ch_mode == FLAC_CHMODE_MID_SIDE) {
-        int32_t tmp;
-        for (i = 0; i < n; i++) {
-            tmp      = left[i];
-            left[i]  = (tmp + right[i]) >> 1;
-            right[i] =  tmp - right[i];
-        }
-        frame->subframes[1].obits++;
-    } else if (frame->ch_mode == FLAC_CHMODE_LEFT_SIDE) {
-        for (i = 0; i < n; i++)
-            right[i] = left[i] - right[i];
-        frame->subframes[1].obits++;
-    } else {
-        for (i = 0; i < n; i++)
-            left[i] -= right[i];
-        frame->subframes[0].obits++;
-    }
-}
-
-
-static void write_utf8(PutBitContext *pb, uint32_t val)
-{
-    uint8_t tmp;
-    PUT_UTF8(val, tmp, put_bits(pb, 8, tmp);)
-}
-
-
-static void write_frame_header(FlacEncodeContext *s)
-{
-    FlacFrame *frame;
-    int crc;
-
-    frame = &s->frame;
-
-    put_bits(&s->pb, 16, 0xFFF8);
-    put_bits(&s->pb, 4, frame->bs_code[0]);
-    put_bits(&s->pb, 4, s->sr_code[0]);
-
-    if (frame->ch_mode == FLAC_CHMODE_INDEPENDENT)
-        put_bits(&s->pb, 4, s->channels-1);
-    else
-        put_bits(&s->pb, 4, frame->ch_mode + FLAC_MAX_CHANNELS - 1);
-
-    put_bits(&s->pb, 3, s->bps_code);
-    put_bits(&s->pb, 1, 0);
-    write_utf8(&s->pb, s->frame_count);
-
-    if (frame->bs_code[0] == 6)
-        put_bits(&s->pb, 8, frame->bs_code[1]);
-    else if (frame->bs_code[0] == 7)
-        put_bits(&s->pb, 16, frame->bs_code[1]);
-
-    if (s->sr_code[0] == 12)
-        put_bits(&s->pb, 8, s->sr_code[1]);
-    else if (s->sr_code[0] > 12)
-        put_bits(&s->pb, 16, s->sr_code[1]);
-
-    flush_put_bits(&s->pb);
-    crc = av_crc(av_crc_get_table(AV_CRC_8_ATM), 0, s->pb.buf,
-                 put_bits_count(&s->pb) >> 3);
-    put_bits(&s->pb, 8, crc);
-}
-
-
-static void write_subframes(FlacEncodeContext *s)
-{
-    int ch;
-
-    for (ch = 0; ch < s->channels; ch++) {
-        FlacSubframe *sub = &s->frame.subframes[ch];
-        int i, p, porder, psize;
-        int32_t *part_end;
-        int32_t *res       =  sub->residual;
-        int32_t *frame_end = &sub->residual[s->frame.blocksize];
-
-        /* subframe header */
-        put_bits(&s->pb, 1, 0);
-        put_bits(&s->pb, 6, sub->type_code);
-        put_bits(&s->pb, 1, !!sub->wasted);
-        if (sub->wasted)
-            put_bits(&s->pb, sub->wasted, 1);
-
-        /* subframe */
-        if (sub->type == FLAC_SUBFRAME_CONSTANT) {
-            put_sbits(&s->pb, sub->obits, res[0]);
-        } else if (sub->type == FLAC_SUBFRAME_VERBATIM) {
-            while (res < frame_end)
-                put_sbits(&s->pb, sub->obits, *res++);
-        } else {
-            /* warm-up samples */
-            for (i = 0; i < sub->order; i++)
-                put_sbits(&s->pb, sub->obits, *res++);
-
-            /* LPC coefficients */
-            if (sub->type == FLAC_SUBFRAME_LPC) {
-                int cbits = s->options.lpc_coeff_precision;
-                put_bits( &s->pb, 4, cbits-1);
-                put_sbits(&s->pb, 5, sub->shift);
-                for (i = 0; i < sub->order; i++)
-                    put_sbits(&s->pb, cbits, sub->coefs[i]);
-            }
-
-            /* rice-encoded block */
-            put_bits(&s->pb, 2, sub->rc.coding_mode - 4);
-
-            /* partition order */
-            porder  = sub->rc.porder;
-            psize   = s->frame.blocksize >> porder;
-            put_bits(&s->pb, 4, porder);
-
-            /* residual */
-            part_end  = &sub->residual[psize];
-            for (p = 0; p < 1 << porder; p++) {
-                int k = sub->rc.params[p];
-                put_bits(&s->pb, sub->rc.coding_mode, k);
-                while (res < part_end)
-                    set_sr_golomb_flac(&s->pb, *res++, k, INT32_MAX, 0);
-                part_end = FFMIN(frame_end, part_end + psize);
-            }
-        }
-    }
-}
-
-
-static void write_frame_footer(FlacEncodeContext *s)
-{
-    int crc;
-    flush_put_bits(&s->pb);
-    crc = av_bswap16(av_crc(av_crc_get_table(AV_CRC_16_ANSI), 0, s->pb.buf,
-                            put_bits_count(&s->pb)>>3));
-    put_bits(&s->pb, 16, crc);
-    flush_put_bits(&s->pb);
-}
-
-
-static int write_frame(FlacEncodeContext *s, AVPacket *avpkt)
-{
-    init_put_bits(&s->pb, avpkt->data, avpkt->size);
-    write_frame_header(s);
-    write_subframes(s);
-    write_frame_footer(s);
-    return put_bits_count(&s->pb) >> 3;
-}
-
-
-static int update_md5_sum(FlacEncodeContext *s, const void *samples)
-{
-    const uint8_t *buf;
-    int buf_size = s->frame.blocksize * s->channels *
-                   ((s->avctx->bits_per_raw_sample + 7) / 8);
-
-    if (s->avctx->bits_per_raw_sample > 16 || HAVE_BIGENDIAN) {
-        av_fast_malloc(&s->md5_buffer, &s->md5_buffer_size, buf_size);
-        if (!s->md5_buffer)
-            return AVERROR(ENOMEM);
-    }
-
-    if (s->avctx->bits_per_raw_sample <= 16) {
-        buf = (const uint8_t *)samples;
-#if HAVE_BIGENDIAN
-        s->dsp.bswap16_buf((uint16_t *)s->md5_buffer,
-                           (const uint16_t *)samples, buf_size / 2);
-        buf = s->md5_buffer;
-#endif
-    } else {
-        int i;
-        const int32_t *samples0 = samples;
-        uint8_t *tmp            = s->md5_buffer;
-
-        for (i = 0; i < s->frame.blocksize * s->channels; i++) {
-            int32_t v = samples0[i] >> 8;
-            *tmp++    = (v      ) & 0xFF;
-            *tmp++    = (v >>  8) & 0xFF;
-            *tmp++    = (v >> 16) & 0xFF;
-        }
-        buf = s->md5_buffer;
-    }
-    av_md5_update(s->md5ctx, buf, buf_size);
-
-    return 0;
-}
-
-
-static int flac_encode_frame(AVCodecContext *avctx, AVPacket *avpkt,
-                             const AVFrame *frame, int *got_packet_ptr)
-{
-    FlacEncodeContext *s;
-    int frame_bytes, out_bytes, ret;
-
-    s = avctx->priv_data;
-
-    /* when the last block is reached, update the header in extradata */
-    if (!frame) {
-        s->max_framesize = s->max_encoded_framesize;
-        av_md5_final(s->md5ctx, s->md5sum);
-        write_streaminfo(s, avctx->extradata);
-        return 0;
-    }
-
-    /* change max_framesize for small final frame */
-    if (frame->nb_samples < s->frame.blocksize) {
-        s->max_framesize = ff_flac_get_max_frame_size(frame->nb_samples,
-                                                      s->channels,
-                                                      avctx->bits_per_raw_sample);
-    }
-
-    init_frame(s, frame->nb_samples);
-
-    copy_samples(s, frame->data[0]);
-
-    channel_decorrelation(s);
-
-    remove_wasted_bits(s);
-
-    frame_bytes = encode_frame(s);
-
-    /* fallback to verbatim mode if the compressed frame is larger than it
-       would be if encoded uncompressed. */
-    if (frame_bytes < 0 || frame_bytes > s->max_framesize) {
-        s->frame.verbatim_only = 1;
-        frame_bytes = encode_frame(s);
-        if (frame_bytes < 0) {
-            av_log(avctx, AV_LOG_ERROR, "Bad frame count\n");
-            return frame_bytes;
-        }
-    }
-
-    if ((ret = ff_alloc_packet2(avctx, avpkt, frame_bytes)) < 0)
-        return ret;
-
-    out_bytes = write_frame(s, avpkt);
-
-    s->frame_count++;
-    s->sample_count += frame->nb_samples;
-    if ((ret = update_md5_sum(s, frame->data[0])) < 0) {
-        av_log(avctx, AV_LOG_ERROR, "Error updating MD5 checksum\n");
-        return ret;
-    }
-    if (out_bytes > s->max_encoded_framesize)
-        s->max_encoded_framesize = out_bytes;
-    if (out_bytes < s->min_framesize)
-        s->min_framesize = out_bytes;
-
-    avpkt->pts      = frame->pts;
-    avpkt->duration = ff_samples_to_time_base(avctx, frame->nb_samples);
-    avpkt->size     = out_bytes;
-    *got_packet_ptr = 1;
-    return 0;
-}
-
-
-static av_cold int flac_encode_close(AVCodecContext *avctx)
-{
-    if (avctx->priv_data) {
-        FlacEncodeContext *s = avctx->priv_data;
-        av_freep(&s->md5ctx);
-        av_freep(&s->md5_buffer);
-        ff_lpc_end(&s->lpc_ctx);
-    }
-    av_freep(&avctx->extradata);
-    avctx->extradata_size = 0;
-    return 0;
-}
-
-#define FLAGS AV_OPT_FLAG_ENCODING_PARAM | AV_OPT_FLAG_AUDIO_PARAM
-static const AVOption options[] = {
-{ "lpc_coeff_precision", "LPC coefficient precision", offsetof(FlacEncodeContext, options.lpc_coeff_precision), AV_OPT_TYPE_INT, {.i64 = 15 }, 0, MAX_LPC_PRECISION, FLAGS },
-{ "lpc_type", "LPC algorithm", offsetof(FlacEncodeContext, options.lpc_type), AV_OPT_TYPE_INT, {.i64 = FF_LPC_TYPE_DEFAULT }, FF_LPC_TYPE_DEFAULT, FF_LPC_TYPE_NB-1, FLAGS, "lpc_type" },
-{ "none",     NULL, 0, AV_OPT_TYPE_CONST, {.i64 = FF_LPC_TYPE_NONE },     INT_MIN, INT_MAX, FLAGS, "lpc_type" },
-{ "fixed",    NULL, 0, AV_OPT_TYPE_CONST, {.i64 = FF_LPC_TYPE_FIXED },    INT_MIN, INT_MAX, FLAGS, "lpc_type" },
-{ "levinson", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = FF_LPC_TYPE_LEVINSON }, INT_MIN, INT_MAX, FLAGS, "lpc_type" },
-{ "cholesky", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = FF_LPC_TYPE_CHOLESKY }, INT_MIN, INT_MAX, FLAGS, "lpc_type" },
-{ "lpc_passes", "Number of passes to use for Cholesky factorization during LPC analysis", offsetof(FlacEncodeContext, options.lpc_passes),  AV_OPT_TYPE_INT, {.i64 = 2 }, 1, INT_MAX, FLAGS },
-{ "min_partition_order",  NULL, offsetof(FlacEncodeContext, options.min_partition_order),  AV_OPT_TYPE_INT, {.i64 = -1 },      -1, MAX_PARTITION_ORDER, FLAGS },
-{ "max_partition_order",  NULL, offsetof(FlacEncodeContext, options.max_partition_order),  AV_OPT_TYPE_INT, {.i64 = -1 },      -1, MAX_PARTITION_ORDER, FLAGS },
-{ "prediction_order_method", "Search method for selecting prediction order", offsetof(FlacEncodeContext, options.prediction_order_method), AV_OPT_TYPE_INT, {.i64 = -1 }, -1, ORDER_METHOD_LOG, FLAGS, "predm" },
-{ "estimation", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = ORDER_METHOD_EST },    INT_MIN, INT_MAX, FLAGS, "predm" },
-{ "2level",     NULL, 0, AV_OPT_TYPE_CONST, {.i64 = ORDER_METHOD_2LEVEL }, INT_MIN, INT_MAX, FLAGS, "predm" },
-{ "4level",     NULL, 0, AV_OPT_TYPE_CONST, {.i64 = ORDER_METHOD_4LEVEL }, INT_MIN, INT_MAX, FLAGS, "predm" },
-{ "8level",     NULL, 0, AV_OPT_TYPE_CONST, {.i64 = ORDER_METHOD_8LEVEL }, INT_MIN, INT_MAX, FLAGS, "predm" },
-{ "search",     NULL, 0, AV_OPT_TYPE_CONST, {.i64 = ORDER_METHOD_SEARCH }, INT_MIN, INT_MAX, FLAGS, "predm" },
-{ "log",        NULL, 0, AV_OPT_TYPE_CONST, {.i64 = ORDER_METHOD_LOG },    INT_MIN, INT_MAX, FLAGS, "predm" },
-{ "ch_mode", "Stereo decorrelation mode", offsetof(FlacEncodeContext, options.ch_mode), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, FLAC_CHMODE_MID_SIDE, FLAGS, "ch_mode" },
-{ "auto",       NULL, 0, AV_OPT_TYPE_CONST, { .i64 = -1                      }, INT_MIN, INT_MAX, FLAGS, "ch_mode" },
-{ "indep",      NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FLAC_CHMODE_INDEPENDENT }, INT_MIN, INT_MAX, FLAGS, "ch_mode" },
-{ "left_side",  NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FLAC_CHMODE_LEFT_SIDE   }, INT_MIN, INT_MAX, FLAGS, "ch_mode" },
-{ "right_side", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FLAC_CHMODE_RIGHT_SIDE  }, INT_MIN, INT_MAX, FLAGS, "ch_mode" },
-{ "mid_side",   NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FLAC_CHMODE_MID_SIDE    }, INT_MIN, INT_MAX, FLAGS, "ch_mode" },
-{ NULL },
-};
-
-static const AVClass flac_encoder_class = {
-    "FLAC encoder",
-    av_default_item_name,
-    options,
-    LIBAVUTIL_VERSION_INT,
-};
-
-AVCodec ff_flac_encoder = {
-    .name           = "flac",
-    .type           = AVMEDIA_TYPE_AUDIO,
-    .id             = AV_CODEC_ID_FLAC,
-    .priv_data_size = sizeof(FlacEncodeContext),
-    .init           = flac_encode_init,
-    .encode2        = 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_S32,
-                                                     AV_SAMPLE_FMT_NONE },
-    .long_name      = NULL_IF_CONFIG_SMALL("FLAC (Free Lossless Audio Codec)"),
-    .priv_class     = &flac_encoder_class,
-};