[FFmpeg-devel] [PATCH] avformat: Add black ops audio demuxer
Michael Niedermayer
michaelni at gmx.at
Mon Apr 22 23:42:01 CEST 2013
Fixes Ticket2064
Signed-off-by: Michael Niedermayer <michaelni at gmx.at>
---
libavformat/Makefile | 1 +
libavformat/allformats.c | 1 +
libavformat/boadec.c | 78 ++++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 80 insertions(+)
create mode 100644 libavformat/boadec.c
diff --git a/libavformat/Makefile b/libavformat/Makefile
index 470e7f3..ca74102 100644
--- a/libavformat/Makefile
+++ b/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 \
diff --git a/libavformat/allformats.c b/libavformat/allformats.c
index 80c53f6..f29843a 100644
--- a/libavformat/allformats.c
+++ b/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);
diff --git a/libavformat/boadec.c b/libavformat/boadec.c
new file mode 100644
index 0000000..459ae74
--- /dev/null
+++ b/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,
+};
--
1.7.9.5
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