lavf: add a raw WavPack muxer.

Changelog

@@ -22,6 +22,7 @@ version 10:
 - Escape 130 video decoder
 - support for slice multithreading in libavfilter
 - VC-1 interlaced B-frame support
+- support for WavPack muxing (raw and in Matroska)
 
 
 version 9:

libavformat/Makefile

@@ -335,6 +335,7 @@ OBJS-$(CONFIG_WSVQA_DEMUXER)             += westwood_vqa.o
 OBJS-$(CONFIG_WTV_DEMUXER)               += wtv.o asfdec.o asf.o asfcrypt.o \
                                             avlanguage.o mpegts.o isom.o
 OBJS-$(CONFIG_WV_DEMUXER)                += wvdec.o wv.o apetag.o img2.o
+OBJS-$(CONFIG_WV_MUXER)                  += wvenc.o wv.o apetag.o
 OBJS-$(CONFIG_XA_DEMUXER)                += xa.o
 OBJS-$(CONFIG_XMV_DEMUXER)               += xmv.o
 OBJS-$(CONFIG_XWMA_DEMUXER)              += xwma.o

libavformat/allformats.c

@@ -247,7 +247,7 @@ void av_register_all(void)
     REGISTER_DEMUXER (WSAUD,            wsaud);
     REGISTER_DEMUXER (WSVQA,            wsvqa);
     REGISTER_DEMUXER (WTV,              wtv);
-    REGISTER_DEMUXER (WV,               wv);
+    REGISTER_MUXDEMUX(WV,               wv);
     REGISTER_DEMUXER (XA,               xa);
     REGISTER_DEMUXER (XMV,              xmv);
     REGISTER_DEMUXER (XWMA,             xwma);

libavformat/version.h

@@ -30,8 +30,8 @@
 #include "libavutil/avutil.h"
 
 #define LIBAVFORMAT_VERSION_MAJOR 55
-#define LIBAVFORMAT_VERSION_MINOR  0
-#define LIBAVFORMAT_VERSION_MICRO  1
+#define LIBAVFORMAT_VERSION_MINOR  1
+#define LIBAVFORMAT_VERSION_MICRO  0
 
 #define LIBAVFORMAT_VERSION_INT AV_VERSION_INT(LIBAVFORMAT_VERSION_MAJOR, \
                                                LIBAVFORMAT_VERSION_MINOR, \

libavformat/wvenc.c

@@ -0,0 +1,88 @@
+/*
+ * 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 "libavutil/attributes.h"
+
+#include "apetag.h"
+#include "avformat.h"
+#include "wv.h"
+
+typedef struct WvMuxContext {
+    int64_t samples;
+} WvMuxContext;
+
+static av_cold int wv_write_header(AVFormatContext *ctx)
+{
+    if (ctx->nb_streams > 1 ||
+        ctx->streams[0]->codec->codec_id != AV_CODEC_ID_WAVPACK) {
+        av_log(ctx, AV_LOG_ERROR, "This muxer only supports a single WavPack stream.\n");
+        return AVERROR(EINVAL);
+    }
+
+    return 0;
+}
+
+static int wv_write_packet(AVFormatContext *ctx, AVPacket *pkt)
+{
+    WvMuxContext *s = ctx->priv_data;
+    WvHeader header;
+    int ret;
+
+    if (pkt->size < WV_HEADER_SIZE ||
+        (ret = ff_wv_parse_header(&header, pkt->data)) < 0) {
+        av_log(ctx, AV_LOG_ERROR, "Invalid WavPack packet.\n");
+        return AVERROR(EINVAL);
+    }
+    s->samples += header.samples;
+
+    avio_write(ctx->pb, pkt->data, pkt->size);
+    avio_flush(ctx->pb);
+
+    return 0;
+}
+
+static av_cold int wv_write_trailer(AVFormatContext *ctx)
+{
+    WvMuxContext *s = ctx->priv_data;
+
+    /* update total number of samples in the first block */
+    if (ctx->pb->seekable && s->samples &&
+        s->samples < UINT32_MAX) {
+        int64_t pos = avio_tell(ctx->pb);
+        avio_seek(ctx->pb, 12, SEEK_SET);
+        avio_wl32(ctx->pb, s->samples);
+        avio_seek(ctx->pb, pos, SEEK_SET);
+    }
+
+    ff_ape_write_tag(ctx);
+    return 0;
+}
+
+AVOutputFormat ff_wv_muxer = {
+    .name              = "wv",
+    .long_name         = NULL_IF_CONFIG_SMALL("raw WavPack"),
+    .mime_type         = "audio/x-wavpack",
+    .extensions        = "wv",
+    .priv_data_size    = sizeof(WvMuxContext),
+    .audio_codec       = AV_CODEC_ID_WAVPACK,
+    .video_codec       = AV_CODEC_ID_NONE,
+    .write_header      = wv_write_header,
+    .write_packet      = wv_write_packet,
+    .write_trailer     = wv_write_trailer,
+    .flags             = AVFMT_NOTIMESTAMPS,
+};