avformat: add IPU demuxer

2025-12-13 10:30:05 +01:00 · 2020-09-14 12:02:50 +02:00
parent 5c2d7acb4f
commit 14d6838638
5 changed files with 93 additions and 1 deletions
--- a/libavformat/ipudec.c
+++ b/libavformat/ipudec.c
@@ -0,0 +1,89 @@
+/*
+ * IPU video demuxer
+ * Copyright (c) 2020 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 "avformat.h"
+#include "internal.h"
+#include "avio_internal.h"
+#include "rawdec.h"
+
+#include "libavutil/intreadwrite.h"
+#include "libavcodec/internal.h"
+
+static int ipu_read_probe(const AVProbeData *p)
+{
+    if (AV_RB32(p->buf) != MKBETAG('i', 'p', 'u', 'm'))
+        return 0;
+
+    if (AV_RL32(p->buf + 4) == 0)
+        return 0;
+
+    if (AV_RL16(p->buf + 8) == 0)
+        return 0;
+
+    if (AV_RL16(p->buf + 10) == 0)
+        return 0;
+
+    if (AV_RL32(p->buf + 12) == 0)
+        return 0;
+
+    return AVPROBE_SCORE_MAX;
+}
+
+static int ipu_read_header(AVFormatContext *s)
+{
+    AVIOContext *pb = s->pb;
+    AVStream *st = avformat_new_stream(s, NULL);
+
+    if (!st)
+        return AVERROR(ENOMEM);
+    avio_skip(pb, 8);
+    st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
+    st->codecpar->codec_id = AV_CODEC_ID_IPU;
+    st->codecpar->width    = avio_rl16(pb);
+    st->codecpar->height   = avio_rl16(pb);
+    st->start_time         = 0;
+    st->duration           =
+    st->nb_frames          = avio_rl32(pb);
+    st->need_parsing       = AVSTREAM_PARSE_FULL_RAW;
+    avpriv_set_pts_info(st, 64, 1, 25);
+
+    return 0;
+}
+
+static const AVClass ipu_demuxer_class = {
+    .class_name = "ipu demuxer",
+    .item_name  = av_default_item_name,
+    .option     = ff_raw_options,
+    .version    = LIBAVUTIL_VERSION_INT,
+};
+
+AVInputFormat ff_ipu_demuxer = {
+    .name           = "ipu",
+    .long_name      = NULL_IF_CONFIG_SMALL("raw IPU Video"),
+    .read_probe     = ipu_read_probe,
+    .read_header    = ipu_read_header,
+    .read_packet    = ff_raw_read_partial_packet,
+    .extensions     = "ipu",
+    .flags          = AVFMT_GENERIC_INDEX,
+    .raw_codec_id   = AV_CODEC_ID_IPU,
+    .priv_data_size = sizeof(FFRawDemuxerContext),
+    .priv_class     = &ipu_demuxer_class,
+};