making act segmenter

1 files changed, 110 insertions, 0 deletions

diff --git a/ffmpeg/libavformat/vocenc.c b/ffmpeg/libavformat/vocenc.c
new file mode 100644
index 0000000..29e9363
--- /dev/null
+++ b/ffmpeg/libavformat/vocenc.c
@@ -0,0 +1,110 @@
+/*
+ * Creative Voice File muxer.
+ * Copyright (c) 2006  Aurelien Jacobs <aurel@gnuage.org>
+ *
+ * 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 "voc.h"
+#include "internal.h"
+
+
+typedef struct voc_enc_context {
+    int param_written;
+} VocEncContext;
+
+static int voc_write_header(AVFormatContext *s)
+{
+    AVIOContext *pb = s->pb;
+    AVCodecContext *enc = s->streams[0]->codec;
+    const int header_size = 26;
+    const int version = 0x0114;
+
+    if (s->nb_streams != 1
+        || s->streams[0]->codec->codec_type != AVMEDIA_TYPE_AUDIO)
+        return AVERROR_PATCHWELCOME;
+
+    if (!enc->codec_tag && enc->codec_id != AV_CODEC_ID_PCM_U8) {
+        av_log(s, AV_LOG_ERROR, "unsupported codec\n");
+        return AVERROR(EINVAL);
+    }
+
+    avio_write(pb, ff_voc_magic, sizeof(ff_voc_magic) - 1);
+    avio_wl16(pb, header_size);
+    avio_wl16(pb, version);
+    avio_wl16(pb, ~version + 0x1234);
+
+    return 0;
+}
+
+static int voc_write_packet(AVFormatContext *s, AVPacket *pkt)
+{
+    VocEncContext *voc = s->priv_data;
+    AVCodecContext *enc = s->streams[0]->codec;
+    AVIOContext *pb = s->pb;
+
+    if (!voc->param_written) {
+        if (enc->codec_tag > 3) {
+            avio_w8(pb, VOC_TYPE_NEW_VOICE_DATA);
+            avio_wl24(pb, pkt->size + 12);
+            avio_wl32(pb, enc->sample_rate);
+            avio_w8(pb, enc->bits_per_coded_sample);
+            avio_w8(pb, enc->channels);
+            avio_wl16(pb, enc->codec_tag);
+            avio_wl32(pb, 0);
+        } else {
+            if (s->streams[0]->codec->channels > 1) {
+                avio_w8(pb, VOC_TYPE_EXTENDED);
+                avio_wl24(pb, 4);
+                avio_wl16(pb, 65536-(256000000 + enc->sample_rate*enc->channels/2)/(enc->sample_rate*enc->channels));
+                avio_w8(pb, enc->codec_tag);
+                avio_w8(pb, enc->channels - 1);
+            }
+            avio_w8(pb, VOC_TYPE_VOICE_DATA);
+            avio_wl24(pb, pkt->size + 2);
+            avio_w8(pb, 256 - (1000000 + enc->sample_rate/2) / enc->sample_rate);
+            avio_w8(pb, enc->codec_tag);
+        }
+        voc->param_written = 1;
+    } else {
+        avio_w8(pb, VOC_TYPE_VOICE_DATA_CONT);
+        avio_wl24(pb, pkt->size);
+    }
+
+    avio_write(pb, pkt->data, pkt->size);
+    return 0;
+}
+
+static int voc_write_trailer(AVFormatContext *s)
+{
+    avio_w8(s->pb, 0);
+    return 0;
+}
+
+AVOutputFormat ff_voc_muxer = {
+    .name              = "voc",
+    .long_name         = NULL_IF_CONFIG_SMALL("Creative Voice"),
+    .mime_type         = "audio/x-voc",
+    .extensions        = "voc",
+    .priv_data_size    = sizeof(VocEncContext),
+    .audio_codec       = AV_CODEC_ID_PCM_S16LE,
+    .video_codec       = AV_CODEC_ID_NONE,
+    .write_header      = voc_write_header,
+    .write_packet      = voc_write_packet,
+    .write_trailer     = voc_write_trailer,
+    .codec_tag         = (const AVCodecTag* const []){ ff_voc_codec_tags, 0 },
+};