lavf: add a raw WavPack muxer.

1 files changed, 88 insertions, 0 deletions

diff --git a/libavformat/wvenc.c b/libavformat/wvenc.c
new file mode 100644
index 0000000000..0ce08e884c
--- /dev/null
+++ b/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,
+};