avformat: add bonk demuxer

2025-12-18 21:10:10 +01:00 · 2022-09-07 14:01:42 +02:00
parent 88170070c4
commit 3ce6fa6b6d
5 changed files with 103 additions and 3 deletions
--- a/libavformat/bonk.c
+++ b/libavformat/bonk.c
@@ -0,0 +1,98 @@
+/*
+ * Bonk demuxer
+ * Copyright (c) 2016 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 "demux.h"
+#include "internal.h"
+#include "rawdec.h"
+
+static int bonk_probe(const AVProbeData *p)
+{
+    for (int i = 0; i < p->buf_size - 22; i++) {
+        if (!p->buf[i] && AV_RL32(p->buf + i + 1) == MKTAG('B','O','N','K')) {
+            if (p->buf[i + 5])
+                return 0;
+            if (AV_RL32(p->buf + i + 6) == 0)
+                return 0;
+            if (AV_RL32(p->buf + i + 10) == 0)
+                return 0;
+            if (p->buf[i + 14] == 0)
+                return 0;
+            if (AV_RL16(p->buf + i + 17) == 0 ||
+                AV_RL16(p->buf + i + 17) > 2048)
+                return 0;
+            if (p->buf[i + 19] == 0)
+                return 0;
+            if (AV_RL16(p->buf + i + 20) == 0)
+                return 0;
+            return AVPROBE_SCORE_MAX;
+        } else if (!p->buf[i]) {
+            break;
+        }
+    }
+
+    return 0;
+}
+
+static int bonk_read_header(AVFormatContext *s)
+{
+    AVStream *st;
+    int ret;
+
+    for (int i = 0; !avio_feof(s->pb); i++) {
+        int b = avio_r8(s->pb);
+        if (!b && avio_rl32(s->pb) == MKTAG('B','O','N','K'))
+            break;
+        else if (!b)
+            return AVERROR_INVALIDDATA;
+    }
+
+    st = avformat_new_stream(s, NULL);
+    if (!st)
+        return AVERROR(ENOMEM);
+    if ((ret = ff_get_extradata(s, st->codecpar, s->pb, 17)) < 0)
+        return ret;
+    st->codecpar->codec_type  = AVMEDIA_TYPE_AUDIO;
+    st->codecpar->codec_id    = AV_CODEC_ID_BONK;
+    st->codecpar->sample_rate = AV_RL32(st->codecpar->extradata + 5);
+    st->codecpar->ch_layout.nb_channels = st->codecpar->extradata[9];
+    if (st->codecpar->ch_layout.nb_channels == 0)
+        return AVERROR_INVALIDDATA;
+    st->duration              = AV_RL32(st->codecpar->extradata + 1) / st->codecpar->ch_layout.nb_channels;
+    avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);
+    ffformatcontext(s)->data_offset = avio_tell(s->pb);
+
+    return 0;
+}
+
+const AVInputFormat ff_bonk_demuxer = {
+    .name           = "bonk",
+    .long_name      = NULL_IF_CONFIG_SMALL("raw Bonk"),
+    .read_probe     = bonk_probe,
+    .read_header    = bonk_read_header,
+    .read_packet    = ff_raw_read_partial_packet,
+    .extensions     = "bonk",
+    .flags          = AVFMT_NOBINSEARCH | AVFMT_NOGENSEARCH | AVFMT_NO_BYTE_SEEK | AVFMT_NOTIMESTAMPS,
+    .raw_codec_id   = AV_CODEC_ID_BONK,
+    .priv_data_size = sizeof(FFRawDemuxerContext),
+    .priv_class     = &ff_raw_demuxer_class,
+};