[FFmpeg-devel] [PATCH 2/2] Ensoniq Paris Audio File demuxer
Paul B Mahol
onemda at gmail.com
Wed Nov 28 03:09:02 CET 2012
Signed-off-by: Paul B Mahol <onemda at gmail.com>
---
doc/general.texi | 1 +
libavformat/Makefile | 1 +
libavformat/allformats.c | 1 +
libavformat/epafdec.c | 120 +++++++++++++++++++++++++++++++++++++++++++++++
4 files changed, 123 insertions(+)
create mode 100644 libavformat/epafdec.c
diff --git a/doc/general.texi b/doc/general.texi
index 0e10d30..d421e45 100644
--- a/doc/general.texi
+++ b/doc/general.texi
@@ -199,6 +199,7 @@ library:
@item Electronic Arts cdata @tab @tab X
@item Electronic Arts Multimedia @tab @tab X
@tab Used in various EA games; files have extensions like WVE and UV2.
+ at item Ensoniq Paris Audio File @tab @tab X
@item FFM (FFserver live feed) @tab X @tab X
@item Flash (SWF) @tab X @tab X
@item Flash 9 (AVM2) @tab X @tab X
diff --git a/libavformat/Makefile b/libavformat/Makefile
index 463ce32..7d7207a 100644
--- a/libavformat/Makefile
+++ b/libavformat/Makefile
@@ -94,6 +94,7 @@ OBJS-$(CONFIG_EA_CDATA_DEMUXER) += eacdata.o
OBJS-$(CONFIG_EA_DEMUXER) += electronicarts.o
OBJS-$(CONFIG_EAC3_DEMUXER) += ac3dec.o rawdec.o
OBJS-$(CONFIG_EAC3_MUXER) += rawenc.o
+OBJS-$(CONFIG_EPAF_DEMUXER) += epafdec.o
OBJS-$(CONFIG_FFM_DEMUXER) += ffmdec.o
OBJS-$(CONFIG_FFM_MUXER) += ffmenc.o
OBJS-$(CONFIG_FFMETADATA_DEMUXER) += ffmetadec.o
diff --git a/libavformat/allformats.c b/libavformat/allformats.c
index 6c721c4..df1dc70 100644
--- a/libavformat/allformats.c
+++ b/libavformat/allformats.c
@@ -97,6 +97,7 @@ void av_register_all(void)
REGISTER_DEMUXER (EA, ea);
REGISTER_DEMUXER (EA_CDATA, ea_cdata);
REGISTER_MUXDEMUX (EAC3, eac3);
+ REGISTER_DEMUXER (EPAF, epaf);
REGISTER_MUXER (F4V, f4v);
REGISTER_MUXDEMUX (FFM, ffm);
REGISTER_MUXDEMUX (FFMETADATA, ffmetadata);
diff --git a/libavformat/epafdec.c b/libavformat/epafdec.c
new file mode 100644
index 0000000..0b2fedc
--- /dev/null
+++ b/libavformat/epafdec.c
@@ -0,0 +1,120 @@
+/*
+ * Ensoniq Paris Audio File 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"
+
+static int epaf_probe(AVProbeData *p)
+{
+ if (((AV_RL32(p->buf) == MKTAG('f','a','p',' ') &&
+ AV_RL32(p->buf + 8) == 1) ||
+ (AV_RL32(p->buf) == MKTAG(' ','p','a','f') &&
+ AV_RN32(p->buf + 8) == 0)) &&
+ !AV_RN32(p->buf + 4) &&
+ AV_RN32(p->buf + 12) &&
+ AV_RN32(p->buf + 20))
+ return AVPROBE_SCORE_MAX / 4 * 3;
+ return 0;
+}
+
+static unsigned int get_long(AVFormatContext *s, int le)
+{
+ unsigned v = le ? avio_rl32(s->pb) : avio_rb32(s->pb);
+ return v;
+}
+
+static int epaf_read_header(AVFormatContext *s)
+{
+ AVStream *st;
+ int le;
+
+ avio_skip(s->pb, 4);
+ if (avio_rb32(s->pb)) {
+ av_log(s, AV_LOG_ERROR, "unknown version\n");
+ return AVERROR_INVALIDDATA;
+ }
+
+ le = avio_rl32(s->pb);
+ if (le && le != 1) {
+ av_log(s, AV_LOG_ERROR, "invalid byte order\n");
+ return AVERROR_INVALIDDATA;
+ }
+
+ st = avformat_new_stream(s, NULL);
+ if (!st)
+ return AVERROR(ENOMEM);
+
+ st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
+ st->codec->sample_rate = get_long(s, le);
+ if (!st->codec->sample_rate)
+ return AVERROR_INVALIDDATA;
+
+ switch (get_long(s, le)) {
+ case 0:
+ st->codec->codec_id = le ? AV_CODEC_ID_PCM_S16LE : AV_CODEC_ID_PCM_S16BE;
+ break;
+ case 1:
+ st->codec->codec_id = AV_CODEC_ID_PCM_S24PARIS;
+ break;
+ case 2:
+ st->codec->codec_id = AV_CODEC_ID_PCM_S8;
+ break;
+ }
+
+ st->codec->channels = get_long(s, le);
+ if (!st->codec->channels)
+ return AVERROR_INVALIDDATA;
+
+ if (!(st->codec->bits_per_coded_sample = av_get_bits_per_sample(st->codec->codec_id))) {
+ st->codec->block_align = 32 * st->codec->channels;
+ st->codec->bit_rate = st->codec->sample_rate * st->codec->channels * 128 / 5;
+ } else {
+ st->codec->block_align = st->codec->bits_per_coded_sample * st->codec->channels / 8;
+ }
+
+ avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate);
+
+ if (avio_skip(s->pb, 2024) < 0)
+ return AVERROR_INVALIDDATA;
+ return 0;
+}
+
+static int epaf_read_packet(AVFormatContext *s, AVPacket *pkt)
+{
+ int ret;
+
+ ret = av_get_packet(s->pb, pkt, 256 * s->streams[0]->codec->block_align);
+ pkt->flags &= ~AV_PKT_FLAG_CORRUPT;
+ pkt->stream_index = 0;
+
+ return ret;
+}
+
+AVInputFormat ff_epaf_demuxer = {
+ .name = "epaf",
+ .long_name = NULL_IF_CONFIG_SMALL("Ensoniq Paris Audio File"),
+ .read_probe = epaf_probe,
+ .read_header = epaf_read_header,
+ .read_packet = epaf_read_packet,
+ .extensions = "paf,fap",
+ .flags = AVFMT_GENERIC_INDEX,
+};
--
1.7.11.4
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