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-rw-r--r--libavformat/wvenc.c143
1 files changed, 143 insertions, 0 deletions
diff --git a/libavformat/wvenc.c b/libavformat/wvenc.c
new file mode 100644
index 0000000000..c33d4309ac
--- /dev/null
+++ b/libavformat/wvenc.c
@@ -0,0 +1,143 @@
+/*
+ * WavPack muxer
+ * Copyright (c) 2012 Paul B Mahol
+ *
+ * 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 "libavutil/intreadwrite.h"
+#include "avformat.h"
+#include "internal.h"
+#include "avio_internal.h"
+#include "apetag.h"
+
+#define WV_EXTRA_SIZE 12
+#define WV_END_BLOCK 0x1000
+
+typedef struct{
+ uint32_t duration;
+} WVMuxContext;
+
+static int write_header(AVFormatContext *s)
+{
+ AVCodecContext *codec = s->streams[0]->codec;
+
+ if (s->nb_streams > 1) {
+ av_log(s, AV_LOG_ERROR, "only one stream is supported\n");
+ return AVERROR(EINVAL);
+ }
+ if (codec->codec_id != AV_CODEC_ID_WAVPACK) {
+ av_log(s, AV_LOG_ERROR, "unsupported codec\n");
+ return AVERROR(EINVAL);
+ }
+ if (codec->extradata_size > 0) {
+ avpriv_report_missing_feature(s, "remuxing from matroska container");
+ return AVERROR_PATCHWELCOME;
+ }
+ avpriv_set_pts_info(s->streams[0], 64, 1, codec->sample_rate);
+
+ return 0;
+}
+
+static int write_packet(AVFormatContext *s, AVPacket *pkt)
+{
+ WVMuxContext *wc = s->priv_data;
+ AVCodecContext *codec = s->streams[0]->codec;
+ AVIOContext *pb = s->pb;
+ uint64_t size;
+ uint32_t flags;
+ uint32_t left = pkt->size;
+ uint8_t *ptr = pkt->data;
+ int off = codec->channels > 2 ? 4 : 0;
+
+ /* FIXME: Simplify decoder/demuxer so bellow code can support midstream
+ * change of stream parameters */
+ wc->duration += pkt->duration;
+ ffio_wfourcc(pb, "wvpk");
+ if (off) {
+ size = AV_RL32(pkt->data);
+ if (size <= 12)
+ return AVERROR_INVALIDDATA;
+ size -= 12;
+ } else {
+ size = pkt->size;
+ }
+
+ if (size + off > left)
+ return AVERROR_INVALIDDATA;
+
+ avio_wl32(pb, size + 12);
+ avio_wl16(pb, 0x410);
+ avio_w8(pb, 0);
+ avio_w8(pb, 0);
+ avio_wl32(pb, -1);
+ avio_wl32(pb, pkt->pts);
+ ptr += off; left -= off;
+ flags = AV_RL32(ptr + 4);
+ avio_write(pb, ptr, size);
+ ptr += size; left -= size;
+
+ while (!(flags & WV_END_BLOCK) &&
+ (left >= 4 + WV_EXTRA_SIZE)) {
+ ffio_wfourcc(pb, "wvpk");
+ size = AV_RL32(ptr);
+ ptr += 4; left -= 4;
+ if (size < 24 || size - 24 > left)
+ return AVERROR_INVALIDDATA;
+ avio_wl32(pb, size);
+ avio_wl16(pb, 0x410);
+ avio_w8(pb, 0);
+ avio_w8(pb, 0);
+ avio_wl32(pb, -1);
+ avio_wl32(pb, pkt->pts);
+ flags = AV_RL32(ptr + 4);
+ avio_write(pb, ptr, WV_EXTRA_SIZE);
+ ptr += WV_EXTRA_SIZE; left -= WV_EXTRA_SIZE;
+ avio_write(pb, ptr, size - 24);
+ ptr += size - 24; left -= size - 24;
+ }
+
+ return 0;
+}
+
+static int write_trailer(AVFormatContext *s)
+{
+ WVMuxContext *wc = s->priv_data;
+ AVIOContext *pb = s->pb;
+
+ ff_ape_write(s);
+
+ if (pb->seekable) {
+ avio_seek(pb, 12, SEEK_SET);
+ avio_wl32(pb, wc->duration);
+ avio_flush(pb);
+ }
+
+ return 0;
+}
+
+AVOutputFormat ff_wv_muxer = {
+ .name = "wv",
+ .long_name = NULL_IF_CONFIG_SMALL("WavPack"),
+ .priv_data_size = sizeof(WVMuxContext),
+ .extensions = "wv",
+ .audio_codec = AV_CODEC_ID_WAVPACK,
+ .video_codec = AV_CODEC_ID_NONE,
+ .write_header = write_header,
+ .write_packet = write_packet,
+ .write_trailer = write_trailer,
+};