libwavpackenc: remove libwavpackenc wrapper

The manual states "there is virtually no reason to use that encoder.".

It supports less sample formats than the native encoder, is less efficient
than the native encoder and is also slower and pretty much remains untested.
libwavpack also isn't being fuzzed, which given that we plug the parameters
without any sanitizing them looks concerning.

Changelog

@@ -30,6 +30,7 @@ version <next>:
 - IPU decoder, parser and demuxer
 - Intel QSV-accelerated AV1 decoding
 - Argonaut Games Video decoder
+- libwavpack encoder removed
 
 
 version 4.3:

configure

@@ -190,9 +190,9 @@ External library support:
   Using any of the following switches will allow FFmpeg to link to the
   corresponding external library. All the components depending on that library
   will become enabled, if all their other dependencies are met and they are not
-  explicitly disabled. E.g. --enable-libwavpack will enable linking to
-  libwavpack and allow the libwavpack encoder to be built, unless it is
-  specifically disabled with --disable-encoder=libwavpack.
+  explicitly disabled. E.g. --enable-libopus will enable linking to
+  libopus and allow the libopus encoder to be built, unless it is
+  specifically disabled with --disable-encoder=libopus.
 
   Note that only the system libraries are auto-detected. All the other external
   libraries must be explicitly enabled.
@@ -284,7 +284,6 @@ External library support:
   --enable-libvorbis       enable Vorbis en/decoding via libvorbis,
                            native implementation exists [no]
   --enable-libvpx          enable VP8 and VP9 de/encoding via libvpx [no]
-  --enable-libwavpack      enable wavpack encoding via libwavpack [no]
   --enable-libwebp         enable WebP encoding via libwebp [no]
   --enable-libx264         enable H.264 encoding via x264 [no]
   --enable-libx265         enable HEVC encoding via x265 [no]
@@ -1815,7 +1814,6 @@ EXTERNAL_LIBRARY_LIST="
     libvmaf
     libvorbis
     libvpx
-    libwavpack
     libwebp
     libxml2
     libzimg
@@ -3265,8 +3263,6 @@ libvpx_vp8_decoder_deps="libvpx"
 libvpx_vp8_encoder_deps="libvpx"
 libvpx_vp9_decoder_deps="libvpx"
 libvpx_vp9_encoder_deps="libvpx"
-libwavpack_encoder_deps="libwavpack"
-libwavpack_encoder_select="audio_frame_queue"
 libwebp_encoder_deps="libwebp"
 libwebp_anim_encoder_deps="libwebp"
 libx262_encoder_deps="libx262"
@@ -6439,7 +6435,6 @@ enabled libvpx            && {
     fi
 }
 
-enabled libwavpack        && require libwavpack wavpack/wavpack.h WavpackOpenFileOutput  -lwavpack
 enabled libwebp           && {
     enabled libwebp_encoder      && require_pkg_config libwebp "libwebp >= 0.2.0" webp/encode.h WebPGetEncoderVersion
     enabled libwebp_anim_encoder && check_pkg_config libwebp_anim_encoder "libwebpmux >= 0.4.0" webp/mux.h WebPAnimEncoderOptionsInit; }

doc/encoders.texi

@@ -1185,53 +1185,6 @@ transient response is a higher bitrate.
 
 @end table
 
-@anchor{libwavpack}
-@section libwavpack
-
-A wrapper providing WavPack encoding through libwavpack.
-
-Only lossless mode using 32-bit integer samples is supported currently.
-
-Requires the presence of the libwavpack headers and library during
-configuration. You need to explicitly configure the build with
-@code{--enable-libwavpack}.
-
-Note that a libavcodec-native encoder for the WavPack codec exists so users can
-encode audios with this codec without using this encoder. See @ref{wavpackenc}.
-
-@subsection Options
-
-@command{wavpack} command line utility's corresponding options are listed in
-parentheses, if any.
-
-@table @option
-@item frame_size (@emph{--blocksize})
-Default is 32768.
-
-@item compression_level
-Set speed vs. compression tradeoff. Acceptable arguments are listed below:
-
-@table @samp
-@item 0 (@emph{-f})
-Fast mode.
-
-@item 1
-Normal (default) settings.
-
-@item 2 (@emph{-h})
-High quality.
-
-@item 3 (@emph{-hh})
-Very high quality.
-
-@item 4-8 (@emph{-hh -x}@var{EXTRAPROC})
-Same as @samp{3}, but with extra processing enabled.
-
-@samp{4} is the same as @option{-x2} and @samp{8} is the same as @option{-x6}.
-
-@end table
-@end table
-
 @anchor{mjpegenc}
 @section mjpeg
 
@@ -1258,11 +1211,6 @@ Compute and use optimal huffman tables.
 
 WavPack lossless audio encoder.
 
-This is a libavcodec-native WavPack encoder. There is also an encoder based on
-libwavpack, but there is virtually no reason to use that encoder.
-
-See also @ref{libwavpack}.
-
 @subsection Options
 
 The equivalent options for @command{wavpack} command line utility are listed in
@@ -1283,7 +1231,6 @@ For the complete formula of calculating default, see
 @file{libavcodec/wavpackenc.c}.
 
 @item compression_level (@emph{-f}, @emph{-h}, @emph{-hh}, and @emph{-x})
-This option's syntax is consistent with @ref{libwavpack}'s.
 @end table
 
 @subsubsection Private options

doc/general_contents.texi

@@ -278,14 +278,6 @@ Due to security concerns, Vapoursynth scripts will not
 be autodetected so the input format has to be forced. For ff* CLI tools,
 add @code{-f vapoursynth} before the input @code{-i yourscript.vpy}.
 
-@section WavPack
-
-FFmpeg can make use of the libwavpack library for WavPack encoding.
-
-Go to @url{http://www.wavpack.com/} and follow the instructions for
-installing the library. Then pass @code{--enable-libwavpack} to configure to
-enable it.
-
 @section x264
 
 FFmpeg can make use of the x264 library for H.264 encoding.

libavcodec/Makefile

@@ -1048,7 +1048,6 @@ OBJS-$(CONFIG_LIBVPX_VP8_DECODER)         += libvpxdec.o
 OBJS-$(CONFIG_LIBVPX_VP8_ENCODER)         += libvpxenc.o
 OBJS-$(CONFIG_LIBVPX_VP9_DECODER)         += libvpxdec.o libvpx.o
 OBJS-$(CONFIG_LIBVPX_VP9_ENCODER)         += libvpxenc.o libvpx.o
-OBJS-$(CONFIG_LIBWAVPACK_ENCODER)         += libwavpackenc.o
 OBJS-$(CONFIG_LIBWEBP_ENCODER)            += libwebpenc_common.o libwebpenc.o
 OBJS-$(CONFIG_LIBWEBP_ANIM_ENCODER)       += libwebpenc_common.o libwebpenc_animencoder.o
 OBJS-$(CONFIG_LIBX262_ENCODER)            += libx264.o

libavcodec/allcodecs.c

@@ -746,7 +746,6 @@ extern AVCodec ff_libvpx_vp8_encoder;
 extern AVCodec ff_libvpx_vp8_decoder;
 extern AVCodec ff_libvpx_vp9_encoder;
 extern AVCodec ff_libvpx_vp9_decoder;
-extern AVCodec ff_libwavpack_encoder;
 /* preferred over libwebp */
 extern AVCodec ff_libwebp_anim_encoder;
 extern AVCodec ff_libwebp_encoder;

libavcodec/libwavpackenc.c

@@ -1,195 +0,0 @@
-/*
- * 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 <wavpack/wavpack.h>
-#include <string.h>
-
-#include "libavutil/attributes.h"
-#include "libavutil/opt.h"
-#include "libavutil/samplefmt.h"
-
-#include "audio_frame_queue.h"
-#include "avcodec.h"
-#include "internal.h"
-
-#define WV_DEFAULT_BLOCK_SIZE 32768
-
-typedef struct LibWavpackContext {
-    const AVClass *class;
-    WavpackContext *wv;
-    AudioFrameQueue afq;
-
-    AVPacket *pkt;
-    int user_size;
-
-    int got_output;
-} LibWavpackContext;
-
-static int wavpack_encode_frame(AVCodecContext *avctx, AVPacket *pkt,
-                                const AVFrame *frame, int *got_output)
-{
-    LibWavpackContext *s = avctx->priv_data;
-    int ret;
-
-    s->got_output = 0;
-    s->pkt        = pkt;
-    s->user_size  = pkt->size;
-
-    if (frame) {
-        ret = ff_af_queue_add(&s->afq, frame);
-        if (ret < 0)
-            return ret;
-
-        ret = WavpackPackSamples(s->wv, (int32_t*)frame->data[0], frame->nb_samples);
-        if (!ret) {
-            av_log(avctx, AV_LOG_ERROR, "Error encoding a frame: %s\n",
-                   WavpackGetErrorMessage(s->wv));
-            return AVERROR_UNKNOWN;
-        }
-    }
-
-    if (!s->got_output &&
-        (!frame || frame->nb_samples < avctx->frame_size)) {
-        ret = WavpackFlushSamples(s->wv);
-        if (!ret) {
-            av_log(avctx, AV_LOG_ERROR, "Error flushing the encoder: %s\n",
-                   WavpackGetErrorMessage(s->wv));
-            return AVERROR_UNKNOWN;
-        }
-    }
-
-    if (s->got_output) {
-        ff_af_queue_remove(&s->afq, avctx->frame_size, &pkt->pts, &pkt->duration);
-        *got_output = 1;
-    }
-
-    return 0;
-}
-
-static int encode_callback(void *id, void *data, int32_t count)
-{
-    AVCodecContext *avctx = id;
-    LibWavpackContext *s  = avctx->priv_data;
-    int ret, offset = s->pkt->size;
-
-    if (s->user_size) {
-        if (s->user_size - count < s->pkt->size) {
-            av_log(avctx, AV_LOG_ERROR, "Provided packet too small.\n");
-            return 0;
-        }
-        s->pkt->size += count;
-    } else {
-        ret = av_grow_packet(s->pkt, count);
-        if (ret < 0) {
-            av_log(avctx, AV_LOG_ERROR, "Error allocating output packet.\n");
-            return 0;
-        }
-    }
-
-    memcpy(s->pkt->data + offset, data, count);
-
-    s->got_output = 1;
-
-    return 1;
-}
-
-static av_cold int wavpack_encode_init(AVCodecContext *avctx)
-{
-    LibWavpackContext *s = avctx->priv_data;
-    WavpackConfig config = { 0 };
-    int ret;
-
-    s->wv = WavpackOpenFileOutput(encode_callback, avctx, NULL);
-    if (!s->wv) {
-        av_log(avctx, AV_LOG_ERROR, "Error allocating the encoder.\n");
-        return AVERROR(ENOMEM);
-    }
-
-    if (!avctx->frame_size)
-        avctx->frame_size = WV_DEFAULT_BLOCK_SIZE;
-
-    config.bytes_per_sample = 4;
-    config.bits_per_sample  = 32;
-    config.block_samples    = avctx->frame_size;
-    config.channel_mask     = avctx->channel_layout;
-    config.num_channels     = avctx->channels;
-    config.sample_rate      = avctx->sample_rate;
-
-    if (avctx->compression_level != FF_COMPRESSION_DEFAULT) {
-        if (avctx->compression_level >= 3) {
-            config.flags |= CONFIG_VERY_HIGH_FLAG;
-
-            if      (avctx->compression_level >= 8)
-                config.xmode = 6;
-            else if (avctx->compression_level >= 7)
-                config.xmode = 5;
-            else if (avctx->compression_level >= 6)
-                config.xmode = 4;
-            else if (avctx->compression_level >= 5)
-                config.xmode = 3;
-            else if (avctx->compression_level >= 4)
-                config.xmode = 2;
-        } else if (avctx->compression_level >= 2)
-            config.flags |= CONFIG_HIGH_FLAG;
-        else if (avctx->compression_level < 1)
-            config.flags |= CONFIG_FAST_FLAG;
-    }
-
-    ret = WavpackSetConfiguration(s->wv, &config, -1);
-    if (!ret)
-        goto fail;
-
-    ret = WavpackPackInit(s->wv);
-    if (!ret)
-        goto fail;
-
-    ff_af_queue_init(avctx, &s->afq);
-
-    return 0;
-
-fail:
-    av_log(avctx, AV_LOG_ERROR, "Error configuring the encoder: %s.\n",
-           WavpackGetErrorMessage(s->wv));
-    WavpackCloseFile(s->wv);
-    return AVERROR_UNKNOWN;
-}
-
-static av_cold int wavpack_encode_close(AVCodecContext *avctx)
-{
-    LibWavpackContext *s = avctx->priv_data;
-
-    WavpackCloseFile(s->wv);
-
-    ff_af_queue_close(&s->afq);
-
-    return 0;
-}
-
-AVCodec ff_libwavpack_encoder = {
-    .name           = "libwavpack",
-    .type           = AVMEDIA_TYPE_AUDIO,
-    .id             = AV_CODEC_ID_WAVPACK,
-    .priv_data_size = sizeof(LibWavpackContext),
-    .init           = wavpack_encode_init,
-    .encode2        = wavpack_encode_frame,
-    .close          = wavpack_encode_close,
-    .capabilities   = AV_CODEC_CAP_DELAY | AV_CODEC_CAP_SMALL_LAST_FRAME,
-    .sample_fmts    = (const enum AVSampleFormat[]){ AV_SAMPLE_FMT_S32,
-                                                     AV_SAMPLE_FMT_NONE },
-    .wrapper_name   = "libwavpack",
-};