[FFmpeg-cvslog] AVR demuxer
Paul B Mahol
git at videolan.org
Mon Nov 5 18:32:46 CET 2012
ffmpeg | branch: master | Paul B Mahol <onemda at gmail.com> | Sat Nov 3 18:09:46 2012 +0000| [962314fe2769dcc4eb6b950a671c30252331487a] | committer: Paul B Mahol
AVR demuxer
Signed-off-by: Paul B Mahol <onemda at gmail.com>
> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=962314fe2769dcc4eb6b950a671c30252331487a
---
Changelog | 1 +
doc/general.texi | 2 +
libavformat/Makefile | 1 +
libavformat/allformats.c | 1 +
libavformat/avr.c | 95 ++++++++++++++++++++++++++++++++++++++++++++++
libavformat/version.h | 2 +-
6 files changed, 101 insertions(+), 1 deletion(-)
diff --git a/Changelog b/Changelog
index 6c63ad6..b6bff7b 100644
--- a/Changelog
+++ b/Changelog
@@ -20,6 +20,7 @@ version <next>:
- ffescape tool
- metadata (info chunk) support in CAF muxer
- field filter ported from libmpcodecs
+- AVR demuxer
version 1.0:
diff --git a/doc/general.texi b/doc/general.texi
index 8ec1d28..9768339 100644
--- a/doc/general.texi
+++ b/doc/general.texi
@@ -150,6 +150,8 @@ library:
@item ASF @tab X @tab X
@item AVI @tab X @tab X
@item AVISynth @tab @tab X
+ at item AVR @tab @tab X
+ @tab Audio format used on Mac.
@item AVS @tab @tab X
@tab Multimedia format used by the Creature Shock game.
@item Beam Software SIFF @tab @tab X
diff --git a/libavformat/Makefile b/libavformat/Makefile
index ff16b3b..5176c4f 100644
--- a/libavformat/Makefile
+++ b/libavformat/Makefile
@@ -56,6 +56,7 @@ OBJS-$(CONFIG_AVI_DEMUXER) += avidec.o
OBJS-$(CONFIG_AVI_MUXER) += avienc.o
OBJS-$(CONFIG_AVISYNTH) += avisynth.o
OBJS-$(CONFIG_AVM2_MUXER) += swfenc.o swf.o
+OBJS-$(CONFIG_AVR_DEMUXER) += avr.o
OBJS-$(CONFIG_AVS_DEMUXER) += avs.o vocdec.o voc.o
OBJS-$(CONFIG_BETHSOFTVID_DEMUXER) += bethsoftvid.o
OBJS-$(CONFIG_BFI_DEMUXER) += bfi.o
diff --git a/libavformat/allformats.c b/libavformat/allformats.c
index 3551394..ea345e5 100644
--- a/libavformat/allformats.c
+++ b/libavformat/allformats.c
@@ -69,6 +69,7 @@ void av_register_all(void)
REGISTER_MUXDEMUX (AVI, avi);
REGISTER_DEMUXER (AVISYNTH, avisynth);
REGISTER_MUXER (AVM2, avm2);
+ REGISTER_DEMUXER (AVR, avr);
REGISTER_DEMUXER (AVS, avs);
REGISTER_DEMUXER (BETHSOFTVID, bethsoftvid);
REGISTER_DEMUXER (BFI, bfi);
diff --git a/libavformat/avr.c b/libavformat/avr.c
new file mode 100644
index 0000000..1e212fc
--- /dev/null
+++ b/libavformat/avr.c
@@ -0,0 +1,95 @@
+/*
+ * AVR demuxer
+ * Copyright (c) 2012 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 "internal.h"
+#include "rawdec.h"
+
+static int avr_probe(AVProbeData *p)
+{
+ if (AV_RL32(p->buf) == MKTAG('2', 'B', 'I', 'T'))
+ return AVPROBE_SCORE_MAX / 2;
+ return 0;
+}
+
+static int avr_read_header(AVFormatContext *s)
+{
+ uint16_t chan, sign, bps;
+ AVStream *st;
+
+ st = avformat_new_stream(s, NULL);
+ if (!st)
+ return AVERROR(ENOMEM);
+
+ st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
+
+ avio_skip(s->pb, 4); // magic
+ avio_skip(s->pb, 8); // sample_name
+
+ chan = avio_rb16(s->pb);
+ if (!chan) {
+ st->codec->channels = 1;
+ } else if (chan == 0xFFFFu) {
+ st->codec->channels = 2;
+ } else {
+ av_log_ask_for_sample(s, "unknown number of channels\n");
+ return AVERROR_PATCHWELCOME;
+ }
+
+ st->codec->bits_per_coded_sample = bps = avio_rb16(s->pb);
+
+ sign = avio_rb16(s->pb);
+
+ avio_skip(s->pb, 2); // loop
+ avio_skip(s->pb, 2); // midi
+
+ st->codec->sample_rate = avio_rb32(s->pb);
+ avio_skip(s->pb, 4 * 3);
+ avio_skip(s->pb, 2 * 3);
+ avio_skip(s->pb, 20);
+ avio_skip(s->pb, 64);
+
+ if (!sign && bps == 8) {
+ st->codec->codec_id = AV_CODEC_ID_PCM_U8;
+ } else if (!sign && bps == 16) {
+ st->codec->codec_id = AV_CODEC_ID_PCM_U16BE;
+ } else if (sign == 0xFFFFu && bps == 8) {
+ st->codec->codec_id = AV_CODEC_ID_PCM_S8;
+ } else if (sign == 0xFFFFu && bps == 16) {
+ st->codec->codec_id = AV_CODEC_ID_PCM_S16BE;
+ } else {
+ av_log_ask_for_sample(s, "unknown bits per sample\n");
+ return AVERROR_PATCHWELCOME;
+ }
+
+ avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate);
+ return 0;
+}
+
+AVInputFormat ff_avr_demuxer = {
+ .name = "avr",
+ .long_name = NULL_IF_CONFIG_SMALL("Audio Visual Resarch (AVR)"),
+ .read_probe = avr_probe,
+ .read_header = avr_read_header,
+ .read_packet = ff_raw_read_partial_packet,
+ .extensions = "avr",
+};
diff --git a/libavformat/version.h b/libavformat/version.h
index bab294c..73085e0 100644
--- a/libavformat/version.h
+++ b/libavformat/version.h
@@ -30,7 +30,7 @@
#include "libavutil/avutil.h"
#define LIBAVFORMAT_VERSION_MAJOR 54
-#define LIBAVFORMAT_VERSION_MINOR 35
+#define LIBAVFORMAT_VERSION_MINOR 36
#define LIBAVFORMAT_VERSION_MICRO 100
#define LIBAVFORMAT_VERSION_INT AV_VERSION_INT(LIBAVFORMAT_VERSION_MAJOR, \
More information about the ffmpeg-cvslog
mailing list