lavc: add a libwavpack encoder wrapper

Changelog

@@ -24,6 +24,7 @@ version 10:
 - VC-1 interlaced B-frame support
 - support for WavPack muxing (raw and in Matroska)
 - Go2Webinar decoder
+- WavPack encoding through libwavpack
 
 
 version 9:

configure

@@ -200,6 +200,7 @@ External library support:
   --enable-libvo-amrwbenc  enable AMR-WB encoding via libvo-amrwbenc [no]
   --enable-libvorbis       enable Vorbis encoding via libvorbis [no]
   --enable-libvpx          enable VP8 and VP9 de/encoding via libvpx [no]
+  --enable-libwavpack      enable wavpack encoding via libwavpack [no]
   --enable-libx264         enable H.264 encoding via x264 [no]
   --enable-libxavs         enable AVS encoding via xavs [no]
   --enable-libxvid         enable Xvid encoding via xvidcore,
@@ -1060,6 +1061,7 @@ EXTERNAL_LIBRARY_LIST="
     libvo_amrwbenc
     libvorbis
     libvpx
+    libwavpack
     libx264
     libxavs
     libxvid
@@ -1790,6 +1792,7 @@ libvpx_vp8_decoder_deps="libvpx"
 libvpx_vp8_encoder_deps="libvpx"
 libvpx_vp9_decoder_deps="libvpx"
 libvpx_vp9_encoder_deps="libvpx"
+libwavpack_encoder_deps="libwavpack"
 libx264_encoder_deps="libx264"
 libxavs_encoder_deps="libxavs"
 libxvid_encoder_deps="libxvid"
@@ -3735,6 +3738,7 @@ enabled libvpx     && {
                                 die "ERROR: libvpx encoder version must be >=0.9.6"; }
     enabled libvpx_vp9_decoder && { check_lib2 "vpx/vpx_decoder.h vpx/vp8dx.h" "vpx_codec_vp9_dx" -lvpx || disable libvpx_vp9_decoder;  }
     enabled libvpx_vp9_encoder && { check_lib2 "vpx/vpx_encoder.h vpx/vp8cx.h" "vpx_codec_vp9_cx" -lvpx || disable libvpx_vp9_encoder; } }
+enabled libwavpack && require libwavpack wavpack/wavpack.h WavpackOpenFileOutput  -lwavpack
 enabled libx264    && require  libx264 x264.h x264_encoder_encode -lx264 &&
                       { check_cpp_condition x264.h "X264_BUILD >= 118" ||
                         die "ERROR: libx264 version must be >= 0.118."; }

doc/encoders.texi

@@ -412,6 +412,35 @@ Selected by Encoder (default)
 
 @end table
 
+@section libwavpack
+
+A wrapper providing WavPack encoding through libwavpack.
+
+Only lossless mode using 32-bit integer samples is supported currently.
+The @option{compression_level} option can be used to control speed vs.
+compression tradeoff, with the values mapped to libwavpack as follows:
+
+@table @option
+
+@item 0
+Fast mode - corresponding to the wavpack @option{-f} option.
+
+@item 1
+Normal (default) settings.
+
+@item 2
+High quality - corresponding to the wavpack @option{-h} option.
+
+@item 3
+Very high quality - corresponding to the wavpack @option{-hh} option.
+
+@item 4-8
+Same as 3, but with extra processing enabled - corresponding to the wavpack
+@option{-x} option. I.e. 4 is the same as @option{-x2} and 8 is the same as
+@option{-x6}.
+
+@end table
+
 @c man end AUDIO ENCODERS
 
 @chapter Video Encoders

doc/general.texi

@@ -79,6 +79,14 @@ Go to @url{http://www.webmproject.org/} and follow the instructions for
 installing the library. Then pass @code{--enable-libvpx} to configure to
 enable it.
 
+@section libwavpack
+
+Libav 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
 
 Libav can make use of the x264 library for H.264 encoding.
@@ -810,7 +818,8 @@ following image formats are supported:
 @item TwinVQ (VQF flavor)    @tab     @tab  X
 @item Vorbis                 @tab  E  @tab  X
     @tab A native but very primitive encoder exists.
-@item WavPack                @tab     @tab  X
+@item WavPack                @tab  E  @tab  X
+    @tab supported through external library libwavpack
 @item Westwood Audio (SND1)  @tab     @tab  X
 @item Windows Media Audio 1  @tab  X  @tab  X
 @item Windows Media Audio 2  @tab  X  @tab  X

libavcodec/Makefile

@@ -599,6 +599,7 @@ OBJS-$(CONFIG_LIBVPX_VP8_DECODER)         += libvpxdec.o
 OBJS-$(CONFIG_LIBVPX_VP8_ENCODER)         += libvpxenc.o
 OBJS-$(CONFIG_LIBVPX_VP9_DECODER)         += libvpxdec.o
 OBJS-$(CONFIG_LIBVPX_VP9_ENCODER)         += libvpxenc.o
+OBJS-$(CONFIG_LIBWAVPACK_ENCODER)         += libwavpackenc.o
 OBJS-$(CONFIG_LIBX264_ENCODER)            += libx264.o
 OBJS-$(CONFIG_LIBXAVS_ENCODER)            += libxavs.o
 OBJS-$(CONFIG_LIBXVID_ENCODER)            += libxvid.o

libavcodec/allcodecs.c

@@ -432,6 +432,7 @@ void avcodec_register_all(void)
     REGISTER_ENCODER(LIBVORBIS,         libvorbis);
     REGISTER_ENCDEC (LIBVPX_VP8,        libvpx_vp8);
     REGISTER_ENCDEC (LIBVPX_VP9,        libvpx_vp9);
+    REGISTER_ENCODER(LIBWAVPACK,        libwavpack);
     REGISTER_ENCODER(LIBX264,           libx264);
     REGISTER_ENCODER(LIBXAVS,           libxavs);
     REGISTER_ENCODER(LIBXVID,           libxvid);

libavcodec/libwavpackenc.c

@@ -0,0 +1,194 @@
+/*
+ * This file is part of Libav.
+ *
+ * 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.
+ *
+ * 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 Libav; 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   = CODEC_CAP_DELAY | CODEC_CAP_SMALL_LAST_FRAME,
+    .sample_fmts    = (const enum AVSampleFormat[]){ AV_SAMPLE_FMT_S32,
+                                                     AV_SAMPLE_FMT_NONE },
+};

libavcodec/version.h

@@ -27,7 +27,7 @@
  */
 
 #define LIBAVCODEC_VERSION_MAJOR 55
-#define LIBAVCODEC_VERSION_MINOR  8
+#define LIBAVCODEC_VERSION_MINOR  9
 #define LIBAVCODEC_VERSION_MICRO  0
 
 #define LIBAVCODEC_VERSION_INT  AV_VERSION_INT(LIBAVCODEC_VERSION_MAJOR, \