Ensoniq Paris Audio File demuxer

Signed-off-by: Paul B Mahol <onemda@gmail.com>

1 files changed, 104 insertions, 0 deletions

diff --git a/libavformat/epafdec.c b/libavformat/epafdec.c
new file mode 100644
index 0000000000..ffb8b95ec4
--- /dev/null
+++ b/libavformat/epafdec.c
@@ -0,0 +1,104 @@
+/*
+ * 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"
+#include "pcm.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 int epaf_read_header(AVFormatContext *s)
+{
+    int le, sample_rate, codec, channels;
+    AVStream *st;
+
+    avio_skip(s->pb, 4);
+    if (avio_rl32(s->pb))
+        return AVERROR_INVALIDDATA;
+
+    le = avio_rl32(s->pb);
+    if (le && le != 1)
+        return AVERROR_INVALIDDATA;
+
+    if (le) {
+        sample_rate = avio_rl32(s->pb);
+        codec       = avio_rl32(s->pb);
+        channels    = avio_rl32(s->pb);
+    } else {
+        sample_rate = avio_rb32(s->pb);
+        codec       = avio_rb32(s->pb);
+        channels    = avio_rb32(s->pb);
+    }
+
+    if (!channels || !sample_rate)
+        return AVERROR_INVALIDDATA;
+
+    st = avformat_new_stream(s, NULL);
+    if (!st)
+        return AVERROR(ENOMEM);
+
+    st->codec->codec_type  = AVMEDIA_TYPE_AUDIO;
+    st->codec->channels    = channels;
+    st->codec->sample_rate = sample_rate;
+    switch (codec) {
+    case 0:
+        st->codec->codec_id = le ? AV_CODEC_ID_PCM_S16LE : AV_CODEC_ID_PCM_S16BE;
+        break;
+    case 2:
+        st->codec->codec_id = AV_CODEC_ID_PCM_S8;
+        break;
+    case 1:
+        av_log_missing_feature(s, "24-bit Paris PCM format", 1);
+    default:
+        return AVERROR_INVALIDDATA;
+    }
+
+    st->codec->bits_per_coded_sample = av_get_bits_per_sample(st->codec->codec_id);
+    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;
+}
+
+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    = ff_pcm_read_packet,
+    .read_seek      = ff_pcm_read_seek,
+    .extensions     = "paf,fap",
+    .flags          = AVFMT_GENERIC_INDEX,
+};