[FFmpeg-devel] [PATCH 2/2] avformat: add acm demuxer

[Paul B Mahol]

Signed-off-by: Paul B Mahol <onemda at gmail.com>
---
 libavformat/Makefile     |  1 +
 libavformat/acm.c        | 71 ++++++++++++++++++++++++++++++++++++++++++++++++
 libavformat/allformats.c |  1 +
 3 files changed, 73 insertions(+)
 create mode 100644 libavformat/acm.c

diff --git a/libavformat/Makefile b/libavformat/Makefile
index 27aefcb..f2326df 100644
--- a/libavformat/Makefile
+++ b/libavformat/Makefile
@@ -63,6 +63,7 @@ OBJS-$(CONFIG_AA_DEMUXER)                += aadec.o
 OBJS-$(CONFIG_AAC_DEMUXER)               += aacdec.o apetag.o img2.o rawdec.o
 OBJS-$(CONFIG_AC3_DEMUXER)               += ac3dec.o rawdec.o
 OBJS-$(CONFIG_AC3_MUXER)                 += rawenc.o
+OBJS-$(CONFIG_ACM_DEMUXER)               += acm.o rawdec.o
 OBJS-$(CONFIG_ACT_DEMUXER)               += act.o
 OBJS-$(CONFIG_ADF_DEMUXER)               += bintext.o sauce.o
 OBJS-$(CONFIG_ADP_DEMUXER)               += adp.o
diff --git a/libavformat/acm.c b/libavformat/acm.c
new file mode 100644
index 0000000..a2e0a12
--- /dev/null
+++ b/libavformat/acm.c
@@ -0,0 +1,71 @@
+/*
+ * ACM demuxer
+ * Copyright (c) 2015 Paul B Mahol
+ *
+ * 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 "libavutil/intreadwrite.h"
+#include "avformat.h"
+#include "rawdec.h"
+#include "internal.h"
+
+static int acm_probe(AVProbeData *p)
+{
+    if (AV_RB32(p->buf) != 0x97280301)
+        return 0;
+
+    return AVPROBE_SCORE_MAX / 3 * 2;
+}
+
+static int acm_read_header(AVFormatContext *s)
+{
+    AVStream *st;
+    int ret;
+
+    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_INTERPLAY_ACM;
+
+    ff_alloc_extradata(st->codec, 14);
+    if (!st->codec->extradata)
+        return AVERROR(ENOMEM);
+    ret = avio_read(s->pb, st->codec->extradata, 14);
+    if (ret < 10)
+        return ret < 0 ? ret : AVERROR_EOF;
+
+    st->codec->channels    = AV_RL16(st->codec->extradata +  8);
+    st->codec->sample_rate = AV_RL16(st->codec->extradata + 10);
+    if (st->codec->channels <= 0 || st->codec->sample_rate <= 0)
+        return AVERROR_INVALIDDATA;
+    st->duration           = AV_RL32(st->codec->extradata +  4) / st->codec->channels;
+    avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate);
+
+    return 0;
+}
+
+AVInputFormat ff_acm_demuxer = {
+    .name           = "acm",
+    .long_name      = NULL_IF_CONFIG_SMALL("Interplay ACM"),
+    .read_probe     = acm_probe,
+    .read_header    = acm_read_header,
+    .read_packet    = ff_raw_read_partial_packet,
+    .extensions     = "acm",
+};
diff --git a/libavformat/allformats.c b/libavformat/allformats.c
index fc42cb7..92e321c 100644
--- a/libavformat/allformats.c
+++ b/libavformat/allformats.c
@@ -63,6 +63,7 @@ void av_register_all(void)
     REGISTER_DEMUXER (AA,               aa);
     REGISTER_DEMUXER (AAC,              aac);
     REGISTER_MUXDEMUX(AC3,              ac3);
+    REGISTER_DEMUXER (ACM,              acm);
     REGISTER_DEMUXER (ACT,              act);
     REGISTER_DEMUXER (ADF,              adf);
     REGISTER_DEMUXER (ADP,              adp);
-- 
1.9.1