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-rw-r--r--libavformat/eacdata.c100
1 files changed, 100 insertions, 0 deletions
diff --git a/libavformat/eacdata.c b/libavformat/eacdata.c
new file mode 100644
index 0000000000..48de32e6ee
--- /dev/null
+++ b/libavformat/eacdata.c
@@ -0,0 +1,100 @@
+/*
+ * 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 eacdata.c
+ * Electronic Arts cdata Format Demuxer
+ * by Peter Ross (suxen_drol at hotmail dot com)
+ *
+ * Technical details here:
+ * http://wiki.multimedia.cx/index.php?title=EA_Command_And_Conquer_3_Audio_Codec
+ */
+
+#include "avformat.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))
+ return AVPROBE_SCORE_MAX/8;
+ return 0;
+}
+
+static int cdata_read_header(AVFormatContext *s, AVFormatParameters *ap)
+{
+ CdataDemuxContext *cdata = s->priv_data;
+ ByteIOContext *pb = &s->pb;
+ unsigned int sample_rate, header;
+ AVStream *st;
+
+ header = get_be16(pb);
+ switch (header) {
+ case 0x0400: cdata->channels = 1; break;
+ case 0x0404: cdata->channels = 2; break;
+ case 0x040C: cdata->channels = 4; break;
+ default:
+ av_log(s, AV_LOG_INFO, "unknown header 0x%04x\n", header);
+ return -1;
+ };
+
+ sample_rate = get_be16(pb);
+ url_fskip(pb, 12);
+
+ st = av_new_stream(s, 0);
+ if (!st)
+ return AVERROR(ENOMEM);
+ st->codec->codec_type = CODEC_TYPE_AUDIO;
+ st->codec->codec_tag = 0; /* no fourcc */
+ st->codec->codec_id = CODEC_ID_ADPCM_EA_XAS;
+ st->codec->channels = cdata->channels;
+ st->codec->sample_rate = sample_rate;
+ av_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;
+
+ if (av_get_packet(&s->pb, pkt, packet_size) != packet_size)
+ return AVERROR(EIO);
+ pkt->pts = cdata->audio_pts++;
+ return 1;
+}
+
+AVInputFormat ea_cdata_demuxer = {
+ "ea_cdata",
+ "Electronic Arts cdata",
+ sizeof(CdataDemuxContext),
+ cdata_probe,
+ cdata_read_header,
+ cdata_read_packet,
+ .extensions = "cdata",
+};