From a17c3c7d15a841ce330e142966b9420fb64cf299 Mon Sep 17 00:00:00 2001
From: Justin Ruggles <justin.ruggles@gmail.com>
Date: Mon, 21 Nov 2011 02:34:18 -0500
Subject: avformat: add CRI ADX format demuxer

---
 libavformat/adxdec.c | 110 +++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 110 insertions(+)
 create mode 100644 libavformat/adxdec.c

(limited to 'libavformat/adxdec.c')

diff --git a/libavformat/adxdec.c b/libavformat/adxdec.c
new file mode 100644
index 0000000000..76b3728b1e
--- /dev/null
+++ b/libavformat/adxdec.c
@@ -0,0 +1,110 @@
+/*
+ * Copyright (c) 2011 Justin Ruggles
+ *
+ * This file is part of Libav.
+ *
+ * Libav 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.
+ *
+ * Libav 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 Libav; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/**
+ * @file
+ * CRI ADX demuxer
+ */
+
+#include "libavutil/intreadwrite.h"
+#include "libavcodec/adx.h"
+#include "avformat.h"
+
+#define BLOCK_SIZE    18
+#define BLOCK_SAMPLES 32
+
+typedef struct ADXDemuxerContext {
+    int header_size;
+} ADXDemuxerContext;
+
+static int adx_read_packet(AVFormatContext *s, AVPacket *pkt)
+{
+    ADXDemuxerContext *c = s->priv_data;
+    AVCodecContext *avctx = s->streams[0]->codec;
+    int ret, size;
+
+    size = BLOCK_SIZE * avctx->channels;
+
+    pkt->pos = avio_tell(s->pb);
+    pkt->stream_index = 0;
+
+    ret = av_get_packet(s->pb, pkt, size);
+    if (ret != size) {
+        av_free_packet(pkt);
+        return ret < 0 ? ret : AVERROR(EIO);
+    }
+    if (AV_RB16(pkt->data) & 0x8000) {
+        av_free_packet(pkt);
+        return AVERROR_EOF;
+    }
+    pkt->size     = size;
+    pkt->duration = 1;
+    pkt->pts      = (pkt->pos - c->header_size) / size;
+
+    return 0;
+}
+
+static int adx_read_header(AVFormatContext *s, AVFormatParameters *ap)
+{
+    ADXDemuxerContext *c = s->priv_data;
+    AVCodecContext *avctx;
+    int ret;
+
+    AVStream *st = avformat_new_stream(s, NULL);
+    if (!st)
+        return AVERROR(ENOMEM);
+    avctx = s->streams[0]->codec;
+
+    if (avio_rb16(s->pb) != 0x8000)
+        return AVERROR_INVALIDDATA;
+    c->header_size = avio_rb16(s->pb) + 4;
+    avio_seek(s->pb, -4, SEEK_CUR);
+
+    avctx->extradata = av_mallocz(c->header_size + FF_INPUT_BUFFER_PADDING_SIZE);
+    if (!avctx->extradata)
+        return AVERROR(ENOMEM);
+    if (avio_read(s->pb, avctx->extradata, c->header_size) < c->header_size) {
+        av_freep(&avctx->extradata);
+        return AVERROR(EIO);
+    }
+    avctx->extradata_size = c->header_size;
+
+    ret = ff_adx_decode_header(avctx, avctx->extradata, avctx->extradata_size,
+                               &c->header_size, NULL);
+    if (ret)
+        return ret;
+
+    st->codec->codec_type  = AVMEDIA_TYPE_AUDIO;
+    st->codec->codec_id    = s->iformat->value;
+
+    av_set_pts_info(st, 64, BLOCK_SAMPLES, avctx->sample_rate);
+
+    return 0;
+}
+
+AVInputFormat ff_adx_demuxer = {
+    .name           = "adx",
+    .long_name      = NULL_IF_CONFIG_SMALL("CRI ADX"),
+    .priv_data_size = sizeof(ADXDemuxerContext),
+    .read_header    = adx_read_header,
+    .read_packet    = adx_read_packet,
+    .extensions     = "adx",
+    .value          = CODEC_ID_ADPCM_ADX,
+};
-- 
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