avformat: add NSP demuxer

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

1 files changed, 108 insertions, 0 deletions

diff --git a/libavformat/nspdec.c b/libavformat/nspdec.c
new file mode 100644
index 0000000000..34c747b65e
--- /dev/null
+++ b/libavformat/nspdec.c
@@ -0,0 +1,108 @@
+/*
+ * NSP demuxer
+ * Copyright (c) 2017 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/avstring.h"
+#include "libavutil/intreadwrite.h"
+#include "avformat.h"
+#include "internal.h"
+#include "pcm.h"
+
+static int nsp_probe(AVProbeData *p)
+{
+    if (AV_RB32(p->buf) == AV_RB32("FORM") &&
+        AV_RB32(p->buf + 4) == AV_RB32("DS16"))
+        return AVPROBE_SCORE_MAX;
+    return 0;
+}
+
+static int nsp_read_header(AVFormatContext *s)
+{
+    int channels = 0, rate = 0;
+    uint32_t chunk, size;
+    AVStream *st;
+    int64_t pos;
+
+    avio_skip(s->pb, 12);
+    st = avformat_new_stream(s, NULL);
+    if (!st)
+        return AVERROR(ENOMEM);
+
+    while (!avio_feof(s->pb)) {
+        char value[1024];
+
+        chunk = avio_rb32(s->pb);
+        size  = avio_rl32(s->pb);
+        pos   = avio_tell(s->pb);
+
+        switch (chunk) {
+        case MKBETAG('H', 'E', 'D', 'R'):
+        case MKBETAG('H', 'D', 'R', '8'):
+            if (size < 32)
+                return AVERROR_INVALIDDATA;
+            avio_skip(s->pb, 20);
+            rate = avio_rl32(s->pb);
+            avio_skip(s->pb, size - (avio_tell(s->pb) - pos));
+            break;
+        case MKBETAG('N', 'O', 'T', 'E'):
+            avio_get_str(s->pb, size, value, sizeof(value));
+            av_dict_set(&s->metadata, "Comment", value, 0);
+            avio_skip(s->pb, size & 1);
+            break;
+        case MKBETAG('S', 'D', 'A', 'B'):
+            channels = 2;
+            break;
+        case MKBETAG('S', 'D', '_', '2'):
+        case MKBETAG('S', 'D', '_', '3'):
+        case MKBETAG('S', 'D', '_', '4'):
+        case MKBETAG('S', 'D', '_', '5'):
+        case MKBETAG('S', 'D', '_', '6'):
+        case MKBETAG('S', 'D', '_', '7'):
+        case MKBETAG('S', 'D', '_', '8'):
+            av_log(s, AV_LOG_WARNING, "Unsupported chunk!\n");
+        case MKBETAG('S', 'D', 'A', '_'):
+        case MKBETAG('S', 'D', '_', 'A'):
+            channels = 1;
+            break;
+        }
+
+        if (channels)
+            break;
+    }
+
+    st->codecpar->codec_type  = AVMEDIA_TYPE_AUDIO;
+    st->codecpar->channels    = channels;
+    st->codecpar->sample_rate = rate;
+    st->codecpar->codec_id    = AV_CODEC_ID_PCM_S16LE;
+    st->codecpar->block_align = 2 * channels;
+
+    return 0;
+}
+
+AVInputFormat ff_nsp_demuxer = {
+    .name           = "nsp",
+    .long_name      = NULL_IF_CONFIG_SMALL("Computerized Speech Lab NSP"),
+    .read_probe     = nsp_probe,
+    .read_header    = nsp_read_header,
+    .read_packet    = ff_pcm_read_packet,
+    .read_seek      = ff_pcm_read_seek,
+    .extensions     = "nsp",
+    .flags          = AVFMT_GENERIC_INDEX,
+};