making act segmenter

1 files changed, 105 insertions, 0 deletions

diff --git a/ffmpeg/libavformat/eacdata.c b/ffmpeg/libavformat/eacdata.c
new file mode 100644
index 0000000..57e5145
--- /dev/null
+++ b/ffmpeg/libavformat/eacdata.c
@@ -0,0 +1,105 @@
+/*
+ * Electronic Arts .cdata file Demuxer
+ * Copyright (c) 2007 Peter Ross
+ *
+ * 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
+ */
+
+/**
+ * @file
+ * Electronic Arts cdata Format Demuxer
+ * by Peter Ross (pross@xvid.org)
+ *
+ * Technical details here:
+ *  http://wiki.multimedia.cx/index.php?title=EA_Command_And_Conquer_3_Audio_Codec
+ */
+
+#include "avformat.h"
+#include "internal.h"
+
+typedef struct {
+  unsigned int channels;
+  unsigned int audio_pts;
+} CdataDemuxContext;
+
+static int cdata_probe(AVProbeData *p)
+{
+    const uint8_t *b = p->buf;
+
+    if (b[0] == 0x04 && (b[1] == 0x00 || b[1] == 0x04 || b[1] == 0x0C || b[1] == 0x14))
+        return AVPROBE_SCORE_MAX/8;
+    return 0;
+}
+
+static int cdata_read_header(AVFormatContext *s)
+{
+    CdataDemuxContext *cdata = s->priv_data;
+    AVIOContext *pb = s->pb;
+    unsigned int sample_rate, header;
+    AVStream *st;
+    int64_t channel_layout = 0;
+
+    header = avio_rb16(pb);
+    switch (header) {
+        case 0x0400: cdata->channels = 1; break;
+        case 0x0404: cdata->channels = 2; break;
+        case 0x040C: cdata->channels = 4; channel_layout = AV_CH_LAYOUT_QUAD;         break;
+        case 0x0414: cdata->channels = 6; channel_layout = AV_CH_LAYOUT_5POINT1_BACK; break;
+        default:
+            av_log(s, AV_LOG_INFO, "unknown header 0x%04x\n", header);
+            return -1;
+    };
+
+    sample_rate = avio_rb16(pb);
+    avio_skip(pb, (avio_r8(pb) & 0x20) ? 15 : 11);
+
+    st = avformat_new_stream(s, NULL);
+    if (!st)
+        return AVERROR(ENOMEM);
+    st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
+    st->codec->codec_tag = 0; /* no fourcc */
+    st->codec->codec_id = AV_CODEC_ID_ADPCM_EA_XAS;
+    st->codec->channels = cdata->channels;
+    st->codec->channel_layout = channel_layout;
+    st->codec->sample_rate = sample_rate;
+    avpriv_set_pts_info(st, 64, 1, sample_rate);
+
+    cdata->audio_pts = 0;
+    return 0;
+}
+
+static int cdata_read_packet(AVFormatContext *s, AVPacket *pkt)
+{
+    CdataDemuxContext *cdata = s->priv_data;
+    int packet_size = 76*cdata->channels;
+
+    int ret = av_get_packet(s->pb, pkt, packet_size);
+    if (ret < 0)
+        return ret;
+    pkt->pts = cdata->audio_pts++;
+    return 0;
+}
+
+AVInputFormat ff_ea_cdata_demuxer = {
+    .name           = "ea_cdata",
+    .long_name      = NULL_IF_CONFIG_SMALL("Electronic Arts cdata"),
+    .priv_data_size = sizeof(CdataDemuxContext),
+    .read_probe     = cdata_probe,
+    .read_header    = cdata_read_header,
+    .read_packet    = cdata_read_packet,
+    .extensions = "cdata",
+};