avformat: Add black ops audio demuxer

Fixes Ticket2064

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

libavformat/Makefile

@@ -91,6 +91,7 @@ OBJS-$(CONFIG_BINTEXT_DEMUXER)           += bintext.o sauce.o
 OBJS-$(CONFIG_BIT_DEMUXER)               += bit.o
 OBJS-$(CONFIG_BIT_MUXER)                 += bit.o
 OBJS-$(CONFIG_BMV_DEMUXER)               += bmv.o
+OBJS-$(CONFIG_BOA_DEMUXER)               += boadec.o
 OBJS-$(CONFIG_BRSTM_DEMUXER)             += brstm.o
 OBJS-$(CONFIG_C93_DEMUXER)               += c93.o vocdec.o voc.o
 OBJS-$(CONFIG_CAF_DEMUXER)               += cafdec.o caf.o mov.o mov_chan.o \

libavformat/allformats.c

@@ -92,6 +92,7 @@ void av_register_all(void)
     REGISTER_MUXDEMUX(BIT,              bit);
     REGISTER_DEMUXER (BMV,              bmv);
     REGISTER_DEMUXER (BRSTM,            brstm);
+    REGISTER_DEMUXER (BOA,              boa);
     REGISTER_DEMUXER (C93,              c93);
     REGISTER_MUXDEMUX(CAF,              caf);
     REGISTER_MUXDEMUX(CAVSVIDEO,        cavsvideo);

libavformat/boadec.c

@@ -0,0 +1,78 @@
+/*
+ * Black ops audio demuxer
+ * Copyright (c) 2013 Michael Niedermayer
+ *
+ * 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"
+
+static int probe(AVProbeData *p)
+{
+    if (p->buf_size < 2096)
+        return 0;
+    if (   AV_RL32(p->buf     ) != 1
+        || AV_RL32(p->buf +  8) > 100000
+        || AV_RL32(p->buf + 12) > 8
+        || AV_RL32(p->buf + 16) != 2096
+        ||!AV_RL32(p->buf + 21)
+        || AV_RL16(p->buf + 25) != 2096
+        || AV_RL32(p->buf + 48) % AV_RL32(p->buf + 21)
+        )
+        return 0;
+    return AVPROBE_SCORE_MAX / 2;
+}
+
+
+static int read_header(AVFormatContext *s)
+{
+    AVStream *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_MS;
+
+    avio_rl32(s->pb);
+    avio_rl32(s->pb);
+    st->codec->sample_rate = avio_rl32(s->pb);
+    st->codec->channels    = avio_rl32(s->pb);
+    s->data_offset         = avio_rl32(s->pb);
+    avio_r8(s->pb);
+    st->codec->block_align = st->codec->channels * avio_rl32(s->pb);
+
+    avio_seek(s->pb, s->data_offset, SEEK_SET);
+
+    return 0;
+}
+
+static int read_packet(AVFormatContext *s, AVPacket *pkt)
+{
+    AVStream *st = s->streams[0];
+
+    return av_get_packet(s->pb, pkt, st->codec->block_align);
+}
+
+AVInputFormat ff_boa_demuxer = {
+    .name           = "boa",
+    .long_name      = NULL_IF_CONFIG_SMALL("Black Ops Audio"),
+    .read_probe     = probe,
+    .read_header    = read_header,
+    .read_packet    = read_packet,
+    .flags          = AVFMT_GENERIC_INDEX,
+};