1 files changed, 96 insertions, 0 deletions
diff --git a/ffmpeg1/libavformat/apc.c b/ffmpeg1/libavformat/apc.c
new file mode 100644
index 0000000..bb28a62
--- /dev/null
+++ b/ffmpeg1/libavformat/apc.c
@@ -0,0 +1,96 @@
+/*
+ * CRYO APC audio format demuxer
+ * Copyright (c) 2007 Anssi Hannula <anssi.hannula@gmail.com>
+ *
+ * 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 <string.h>
+
+#include "libavutil/channel_layout.h"
+#include "avformat.h"
+
+static int apc_probe(AVProbeData *p)
+{
+    if (!strncmp(p->buf, "CRYO_APC", 8))
+        return AVPROBE_SCORE_MAX;
+
+    return 0;
+}
+
+static int apc_read_header(AVFormatContext *s)
+{
+    AVIOContext *pb = s->pb;
+    AVStream *st;
+
+    avio_rl32(pb); /* CRYO */
+    avio_rl32(pb); /* _APC */
+    avio_rl32(pb); /* 1.20 */
+
+    st = avformat_new_stream(s, NULL);
+    if (!st)
+        return AVERROR(ENOMEM);
+
+    st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
+    st->codec->codec_id = AV_CODEC_ID_ADPCM_IMA_APC;
+
+    avio_rl32(pb); /* number of samples */
+    st->codec->sample_rate = avio_rl32(pb);
+
+    st->codec->extradata_size = 2 * 4;
+    st->codec->extradata = av_malloc(st->codec->extradata_size +
+                                     FF_INPUT_BUFFER_PADDING_SIZE);
+    if (!st->codec->extradata)
+        return AVERROR(ENOMEM);
+
+    /* initial predictor values for adpcm decoder */
+    avio_read(pb, st->codec->extradata, 2 * 4);
+
+    if (avio_rl32(pb)) {
+        st->codec->channels       = 2;
+        st->codec->channel_layout = AV_CH_LAYOUT_STEREO;
+    } else {
+        st->codec->channels       = 1;
+        st->codec->channel_layout = AV_CH_LAYOUT_MONO;
+    }
+
+    st->codec->bits_per_coded_sample = 4;
+    st->codec->bit_rate = st->codec->bits_per_coded_sample * st->codec->channels
+                          * st->codec->sample_rate;
+    st->codec->block_align = 1;
+
+    return 0;
+}
+
+#define MAX_READ_SIZE 4096
+
+static int apc_read_packet(AVFormatContext *s, AVPacket *pkt)
+{
+    if (av_get_packet(s->pb, pkt, MAX_READ_SIZE) <= 0)
+        return AVERROR(EIO);
+    pkt->flags &= ~AV_PKT_FLAG_CORRUPT;
+    pkt->stream_index = 0;
+    return 0;
+}
+
+AVInputFormat ff_apc_demuxer = {
+    .name           = "apc",
+    .long_name      = NULL_IF_CONFIG_SMALL("CRYO APC"),
+    .read_probe     = apc_probe,
+    .read_header    = apc_read_header,
+    .read_packet    = apc_read_packet,
+};