X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=libavcodec%2Fflacenc.c;h=c39a721642e1eea96ee5ecc30fd0fe2b6ae74fd0;hb=a43b1e74e2abaac6e63eb001474855bd44335988;hp=ea3dbe8dc2f7e85780e3c27da44bb8852aae5db7;hpb=675eb677c597f2fce0068fc85f5ce7e57fcd5849;p=ffmpeg

diff --git a/libavcodec/flacenc.c b/libavcodec/flacenc.c
index ea3dbe8dc2f..c39a721642e 100644
--- a/libavcodec/flacenc.c
+++ b/libavcodec/flacenc.c
@@ -2,28 +2,28 @@
  * FLAC audio encoder
  * Copyright (c) 2006  Justin Ruggles <justin.ruggles@gmail.com>
  *
- * This file is part of FFmpeg.
+ * This file is part of Libav.
  *
- * FFmpeg is free software; you can redistribute it and/or
+ * Libav 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,
+ * Libav 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
+ * License along with Libav; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include "libavutil/crc.h"
 #include "libavutil/md5.h"
+#include "libavutil/opt.h"
 #include "avcodec.h"
 #include "get_bits.h"
-#include "dsputil.h"
 #include "golomb.h"
 #include "lpc.h"
 #include "flac.h"
@@ -44,7 +44,7 @@
 typedef struct CompressionOptions {
     int compression_level;
     int block_time_ms;
-    enum AVLPCType lpc_type;
+    enum FFLPCType lpc_type;
     int lpc_passes;
     int lpc_coeff_precision;
     int min_prediction_order;
@@ -81,6 +81,7 @@ typedef struct FlacFrame {
 } FlacFrame;
 
 typedef struct FlacEncodeContext {
+    AVClass *class;
     PutBitContext pb;
     int channels;
     int samplerate;
@@ -95,7 +96,7 @@ typedef struct FlacEncodeContext {
     FlacFrame frame;
     CompressionOptions options;
     AVCodecContext *avctx;
-    DSPContext dsp;
+    LPCContext lpc_ctx;
     struct AVMD5 *md5ctx;
 } FlacEncodeContext;
 
@@ -157,16 +158,16 @@ static av_cold void dprint_compression_options(FlacEncodeContext *s)
     av_log(avctx, AV_LOG_DEBUG, " compression: %d\n", opt->compression_level);
 
     switch (opt->lpc_type) {
-    case AV_LPC_TYPE_NONE:
+    case FF_LPC_TYPE_NONE:
         av_log(avctx, AV_LOG_DEBUG, " lpc type: None\n");
         break;
-    case AV_LPC_TYPE_FIXED:
+    case FF_LPC_TYPE_FIXED:
         av_log(avctx, AV_LOG_DEBUG, " lpc type: Fixed pre-defined coefficients\n");
         break;
-    case AV_LPC_TYPE_LEVINSON:
+    case FF_LPC_TYPE_LEVINSON:
         av_log(avctx, AV_LOG_DEBUG, " lpc type: Levinson-Durbin recursion with Welch window\n");
         break;
-    case AV_LPC_TYPE_CHOLESKY:
+    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;
@@ -212,14 +213,12 @@ 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;
+    int i, level, ret;
     uint8_t *streaminfo;
 
     s->avctx = avctx;
 
-    dsputil_init(&s->dsp, avctx);
-
-    if (avctx->sample_fmt != SAMPLE_FMT_S16)
+    if (avctx->sample_fmt != AV_SAMPLE_FMT_S16)
         return -1;
 
     if (channels < 1 || channels > FLAC_MAX_CHANNELS)
@@ -269,43 +268,42 @@ static av_cold int flac_encode_init(AVCodecContext *avctx)
 
     s->options.block_time_ms = ((int[]){ 27, 27, 27,105,105,105,105,105,105,105,105,105,105})[level];
 
-    s->options.lpc_type      = ((int[]){ AV_LPC_TYPE_FIXED,    AV_LPC_TYPE_FIXED,    AV_LPC_TYPE_FIXED,
-                                         AV_LPC_TYPE_LEVINSON, AV_LPC_TYPE_LEVINSON, AV_LPC_TYPE_LEVINSON,
-                                         AV_LPC_TYPE_LEVINSON, AV_LPC_TYPE_LEVINSON, AV_LPC_TYPE_LEVINSON,
-                                         AV_LPC_TYPE_LEVINSON, AV_LPC_TYPE_LEVINSON, AV_LPC_TYPE_LEVINSON,
-                                         AV_LPC_TYPE_LEVINSON})[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];
 
-    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.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];
 
-    s->options.min_partition_order = ((int[]){  2,  2,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0})[level];
-    s->options.max_partition_order = ((int[]){  2,  2,  3,  3,  3,  8,  8,  8,  8,  8,  8,  8,  8})[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];
 
     /* set compression option overrides from AVCodecContext */
-#if LIBAVCODEC_VERSION_MAJOR < 53
-    /* for compatibility with deprecated AVCodecContext.use_lpc */
-    if (avctx->use_lpc == 0) {
-        s->options.lpc_type = AV_LPC_TYPE_FIXED;
-    } else if (avctx->use_lpc == 1) {
-        s->options.lpc_type = AV_LPC_TYPE_LEVINSON;
-    } else if (avctx->use_lpc > 1) {
-        s->options.lpc_type   = AV_LPC_TYPE_CHOLESKY;
-        s->options.lpc_passes = avctx->use_lpc - 1;
-    }
-#endif
-    if (avctx->lpc_type > AV_LPC_TYPE_DEFAULT) {
-        if (avctx->lpc_type > AV_LPC_TYPE_CHOLESKY) {
+#if FF_API_FLAC_GLOBAL_OPTS
+    if (avctx->lpc_type > FF_LPC_TYPE_DEFAULT) {
+        if (avctx->lpc_type > FF_LPC_TYPE_CHOLESKY) {
             av_log(avctx, AV_LOG_ERROR, "unknown lpc type: %d\n", avctx->lpc_type);
             return -1;
         }
         s->options.lpc_type = avctx->lpc_type;
-        if (s->options.lpc_type == AV_LPC_TYPE_CHOLESKY) {
+        if (s->options.lpc_type == FF_LPC_TYPE_CHOLESKY) {
             if (avctx->lpc_passes < 0) {
                 // default number of passes for Cholesky
                 s->options.lpc_passes = 2;
@@ -318,11 +316,12 @@ static av_cold int flac_encode_init(AVCodecContext *avctx)
             }
         }
     }
+#endif
 
-    if (s->options.lpc_type == AV_LPC_TYPE_NONE) {
+    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 == AV_LPC_TYPE_FIXED) {
+        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);
@@ -336,10 +335,10 @@ static av_cold int flac_encode_init(AVCodecContext *avctx)
         }
         s->options.min_prediction_order = avctx->min_prediction_order;
     }
-    if (s->options.lpc_type == AV_LPC_TYPE_NONE) {
+    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 == AV_LPC_TYPE_FIXED) {
+        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);
@@ -359,6 +358,7 @@ static av_cold int flac_encode_init(AVCodecContext *avctx)
         return -1;
     }
 
+#if FF_API_FLAC_GLOBAL_OPTS
     if (avctx->prediction_order_method >= 0) {
         if (avctx->prediction_order_method > ORDER_METHOD_LOG) {
             av_log(avctx, AV_LOG_ERROR, "invalid prediction order method: %d\n",
@@ -389,6 +389,7 @@ static av_cold int flac_encode_init(AVCodecContext *avctx)
                s->options.min_partition_order, s->options.max_partition_order);
         return -1;
     }
+#endif
 
     if (avctx->frame_size > 0) {
         if (avctx->frame_size < FLAC_MIN_BLOCKSIZE ||
@@ -402,6 +403,7 @@ static av_cold int flac_encode_init(AVCodecContext *avctx)
     }
     s->max_blocksize = s->avctx->frame_size;
 
+#if FF_API_FLAC_GLOBAL_OPTS
     /* set LPC precision */
     if (avctx->lpc_coeff_precision > 0) {
         if (avctx->lpc_coeff_precision > MAX_LPC_PRECISION) {
@@ -410,10 +412,8 @@ static av_cold int flac_encode_init(AVCodecContext *avctx)
             return -1;
         }
         s->options.lpc_coeff_precision = avctx->lpc_coeff_precision;
-    } else {
-        /* default LPC precision */
-        s->options.lpc_coeff_precision = 15;
     }
+#endif
 
     /* set maximum encoded frame size in verbatim mode */
     s->max_framesize = ff_flac_get_max_frame_size(s->avctx->frame_size,
@@ -439,9 +439,12 @@ static av_cold int flac_encode_init(AVCodecContext *avctx)
     if (!avctx->coded_frame)
         return AVERROR(ENOMEM);
 
+    ret = ff_lpc_init(&s->lpc_ctx, avctx->frame_size,
+                      s->options.max_prediction_order, FF_LPC_TYPE_LEVINSON);
+
     dprint_compression_options(s);
 
-    return 0;
+    return ret;
 }
 
 
@@ -493,6 +496,67 @@ static void copy_samples(FlacEncodeContext *s, const int16_t *samples)
 }
 
 
+static int rice_count_exact(int32_t *res, int n, int k)
+{
+    int i;
+    int 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 int subframe_count_exact(FlacEncodeContext *s, FlacSubframe *sub,
+                                int pred_order)
+{
+    int p, porder, psize;
+    int i, part_end;
+    int 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 += 4;
+            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)))
 
 /**
@@ -801,14 +865,14 @@ static int encode_residual_ch(FlacEncodeContext *s, int ch)
     if (i == n) {
         sub->type = sub->type_code = FLAC_SUBFRAME_CONSTANT;
         res[0] = smp[0];
-        return sub->obits;
+        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 sub->obits * n;
+        return subframe_count_exact(s, sub, 0);
     }
 
     min_order  = s->options.min_prediction_order;
@@ -817,8 +881,8 @@ static int encode_residual_ch(FlacEncodeContext *s, int ch)
 
     /* FIXED */
     sub->type = FLAC_SUBFRAME_FIXED;
-    if (s->options.lpc_type == AV_LPC_TYPE_NONE  ||
-        s->options.lpc_type == AV_LPC_TYPE_FIXED || n <= max_order) {
+    if (s->options.lpc_type == FF_LPC_TYPE_NONE  ||
+        s->options.lpc_type == FF_LPC_TYPE_FIXED || n <= max_order) {
         uint32_t bits[MAX_FIXED_ORDER+1];
         if (max_order > MAX_FIXED_ORDER)
             max_order = MAX_FIXED_ORDER;
@@ -834,14 +898,14 @@ static int encode_residual_ch(FlacEncodeContext *s, int ch)
         sub->type_code = sub->type | sub->order;
         if (sub->order != max_order) {
             encode_residual_fixed(res, smp, n, sub->order);
-            return find_subframe_rice_params(s, sub, sub->order);
+            find_subframe_rice_params(s, sub, sub->order);
         }
-        return bits[sub->order];
+        return subframe_count_exact(s, sub, sub->order);
     }
 
     /* LPC */
     sub->type = FLAC_SUBFRAME_LPC;
-    opt_order = ff_lpc_calc_coefs(&s->dsp, smp, n, min_order, max_order,
+    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);
@@ -908,13 +972,15 @@ static int encode_residual_ch(FlacEncodeContext *s, int ch)
 
     encode_residual_lpc(res, smp, n, sub->order, sub->coefs, sub->shift);
 
-    return find_subframe_rice_params(s, sub, sub->order);
+    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 tmp;
+    uint8_t av_unused tmp;
     int count;
 
     /*
@@ -1062,7 +1128,7 @@ static void write_utf8(PutBitContext *pb, uint32_t val)
 }
 
 
-static void output_frame_header(FlacEncodeContext *s)
+static void write_frame_header(FlacEncodeContext *s)
 {
     FlacFrame *frame;
     int crc;
@@ -1099,7 +1165,7 @@ static void output_frame_header(FlacEncodeContext *s)
 }
 
 
-static void output_subframes(FlacEncodeContext *s)
+static void write_subframes(FlacEncodeContext *s)
 {
     int ch;
 
@@ -1157,7 +1223,7 @@ static void output_subframes(FlacEncodeContext *s)
 }
 
 
-static void output_frame_footer(FlacEncodeContext *s)
+static void write_frame_footer(FlacEncodeContext *s)
 {
     int crc;
     flush_put_bits(&s->pb);
@@ -1171,9 +1237,9 @@ static void output_frame_footer(FlacEncodeContext *s)
 static int write_frame(FlacEncodeContext *s, uint8_t *frame, int buf_size)
 {
     init_put_bits(&s->pb, frame, buf_size);
-    output_frame_header(s);
-    output_subframes(s);
-    output_frame_footer(s);
+    write_frame_header(s);
+    write_subframes(s);
+    write_frame_footer(s);
     return put_bits_count(&s->pb) >> 3;
 }
 
@@ -1197,15 +1263,10 @@ static int flac_encode_frame(AVCodecContext *avctx, uint8_t *frame,
 {
     FlacEncodeContext *s;
     const int16_t *samples = data;
-    int out_bytes;
+    int frame_bytes, out_bytes;
 
     s = avctx->priv_data;
 
-    if (buf_size < s->max_framesize * 2) {
-        av_log(avctx, AV_LOG_ERROR, "output buffer too small\n");
-        return 0;
-    }
-
     /* when the last block is reached, update the header in extradata */
     if (!data) {
         s->max_framesize = s->max_encoded_framesize;
@@ -1214,23 +1275,32 @@ static int flac_encode_frame(AVCodecContext *avctx, uint8_t *frame,
         return 0;
     }
 
+    /* change max_framesize for small final frame */
+    if (avctx->frame_size < s->frame.blocksize) {
+        s->max_framesize = ff_flac_get_max_frame_size(avctx->frame_size,
+                                                      s->channels, 16);
+    }
+
     init_frame(s);
 
     copy_samples(s, samples);
 
     channel_decorrelation(s);
 
-    encode_frame(s);
-
-    out_bytes = write_frame(s, frame, buf_size);
+    frame_bytes = encode_frame(s);
 
     /* fallback to verbatim mode if the compressed frame is larger than it
        would be if encoded uncompressed. */
-    if (out_bytes > s->max_framesize) {
+    if (frame_bytes > s->max_framesize) {
         s->frame.verbatim_only = 1;
-        encode_frame(s);
-        out_bytes = write_frame(s, frame, buf_size);
+        frame_bytes = encode_frame(s);
+    }
+
+    if (buf_size < frame_bytes) {
+        av_log(avctx, AV_LOG_ERROR, "output buffer too small\n");
+        return 0;
     }
+    out_bytes = write_frame(s, frame, buf_size);
 
     s->frame_count++;
     avctx->coded_frame->pts = s->sample_count;
@@ -1250,6 +1320,7 @@ static av_cold int flac_encode_close(AVCodecContext *avctx)
     if (avctx->priv_data) {
         FlacEncodeContext *s = avctx->priv_data;
         av_freep(&s->md5ctx);
+        ff_lpc_end(&s->lpc_ctx);
     }
     av_freep(&avctx->extradata);
     avctx->extradata_size = 0;
@@ -1257,17 +1328,44 @@ static av_cold int flac_encode_close(AVCodecContext *avctx)
     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), FF_OPT_TYPE_INT, {.dbl = 15 }, 0, MAX_LPC_PRECISION, FLAGS },
+{ "lpc_type", "LPC algorithm", offsetof(FlacEncodeContext, options.lpc_type), FF_OPT_TYPE_INT, {.dbl = FF_LPC_TYPE_DEFAULT }, FF_LPC_TYPE_DEFAULT, FF_LPC_TYPE_NB-1, FLAGS, "lpc_type" },
+{ "none",     NULL, 0, FF_OPT_TYPE_CONST, {.dbl = FF_LPC_TYPE_NONE },     INT_MIN, INT_MAX, FLAGS, "lpc_type" },
+{ "fixed",    NULL, 0, FF_OPT_TYPE_CONST, {.dbl = FF_LPC_TYPE_FIXED },    INT_MIN, INT_MAX, FLAGS, "lpc_type" },
+{ "levinson", NULL, 0, FF_OPT_TYPE_CONST, {.dbl = FF_LPC_TYPE_LEVINSON }, INT_MIN, INT_MAX, FLAGS, "lpc_type" },
+{ "cholesky", NULL, 0, FF_OPT_TYPE_CONST, {.dbl = 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),  FF_OPT_TYPE_INT, {.dbl = -1 }, INT_MIN, INT_MAX, FLAGS },
+{ "min_partition_order",  NULL, offsetof(FlacEncodeContext, options.min_partition_order),  FF_OPT_TYPE_INT, {.dbl = -1 },      -1, MAX_PARTITION_ORDER, FLAGS },
+{ "max_partition_order",  NULL, offsetof(FlacEncodeContext, options.max_partition_order),  FF_OPT_TYPE_INT, {.dbl = -1 },      -1, MAX_PARTITION_ORDER, FLAGS },
+{ "prediction_order_method", "Search method for selecting prediction order", offsetof(FlacEncodeContext, options.prediction_order_method), FF_OPT_TYPE_INT, {.dbl = -1 }, -1, ORDER_METHOD_LOG, FLAGS, "predm" },
+{ "estimation", NULL, 0, FF_OPT_TYPE_CONST, {.dbl = ORDER_METHOD_EST },    INT_MIN, INT_MAX, FLAGS, "predm" },
+{ "2level",     NULL, 0, FF_OPT_TYPE_CONST, {.dbl = ORDER_METHOD_2LEVEL }, INT_MIN, INT_MAX, FLAGS, "predm" },
+{ "4level",     NULL, 0, FF_OPT_TYPE_CONST, {.dbl = ORDER_METHOD_4LEVEL }, INT_MIN, INT_MAX, FLAGS, "predm" },
+{ "8level",     NULL, 0, FF_OPT_TYPE_CONST, {.dbl = ORDER_METHOD_8LEVEL }, INT_MIN, INT_MAX, FLAGS, "predm" },
+{ "search",     NULL, 0, FF_OPT_TYPE_CONST, {.dbl = ORDER_METHOD_SEARCH }, INT_MIN, INT_MAX, FLAGS, "predm" },
+{ "log",        NULL, 0, FF_OPT_TYPE_CONST, {.dbl = ORDER_METHOD_LOG },    INT_MIN, INT_MAX, FLAGS, "predm" },
+{ NULL },
+};
+
+static const AVClass flac_encoder_class = {
+    "FLAC encoder",
+    av_default_item_name,
+    options,
+    LIBAVUTIL_VERSION_INT,
+};
 
-AVCodec flac_encoder = {
-    "flac",
-    AVMEDIA_TYPE_AUDIO,
-    CODEC_ID_FLAC,
-    sizeof(FlacEncodeContext),
-    flac_encode_init,
-    flac_encode_frame,
-    flac_encode_close,
-    NULL,
+AVCodec ff_flac_encoder = {
+    .name           = "flac",
+    .type           = AVMEDIA_TYPE_AUDIO,
+    .id             = CODEC_ID_FLAC,
+    .priv_data_size = sizeof(FlacEncodeContext),
+    .init           = flac_encode_init,
+    .encode         = flac_encode_frame,
+    .close          = flac_encode_close,
     .capabilities = CODEC_CAP_SMALL_LAST_FRAME | CODEC_CAP_DELAY,
-    .sample_fmts = (const enum SampleFormat[]){SAMPLE_FMT_S16,SAMPLE_FMT_NONE},
+    .sample_fmts = (const enum AVSampleFormat[]){AV_SAMPLE_FMT_S16,AV_SAMPLE_FMT_NONE},
     .long_name = NULL_IF_CONFIG_SMALL("FLAC (Free Lossless Audio Codec)"),
+    .priv_class = &flac_encoder_class,
 };