[FFmpeg-devel] [PATCH 2/2] avformat: add IPU demuxer

[Paul B Mahol]

Signed-off-by: Paul B Mahol <onemda at gmail.com>
---
 libavformat/Makefile     |  1 +
 libavformat/allformats.c |  1 +
 libavformat/ipudec.c     | 89 ++++++++++++++++++++++++++++++++++++++++
 3 files changed, 91 insertions(+)
 create mode 100644 libavformat/ipudec.c

diff --git a/libavformat/Makefile b/libavformat/Makefile
index 992d89a45f..213004cb45 100644
--- a/libavformat/Makefile
+++ b/libavformat/Makefile
@@ -278,6 +278,7 @@ OBJS-$(CONFIG_IMAGE_XPM_PIPE_DEMUXER)     += img2dec.o img2.o
 OBJS-$(CONFIG_IMAGE_XWD_PIPE_DEMUXER)     += img2dec.o img2.o
 OBJS-$(CONFIG_INGENIENT_DEMUXER)         += ingenientdec.o rawdec.o
 OBJS-$(CONFIG_IPMOVIE_DEMUXER)           += ipmovie.o
+OBJS-$(CONFIG_IPU_DEMUXER)               += ipudec.o
 OBJS-$(CONFIG_IRCAM_DEMUXER)             += ircamdec.o ircam.o pcm.o
 OBJS-$(CONFIG_IRCAM_MUXER)               += ircamenc.o ircam.o rawenc.o
 OBJS-$(CONFIG_ISS_DEMUXER)               += iss.o
diff --git a/libavformat/allformats.c b/libavformat/allformats.c
index ac154a3f31..2946a80dd7 100644
--- a/libavformat/allformats.c
+++ b/libavformat/allformats.c
@@ -210,6 +210,7 @@ extern AVInputFormat  ff_image2_alias_pix_demuxer;
 extern AVInputFormat  ff_image2_brender_pix_demuxer;
 extern AVInputFormat  ff_ingenient_demuxer;
 extern AVInputFormat  ff_ipmovie_demuxer;
+extern AVInputFormat  ff_ipu_demuxer;
 extern AVOutputFormat ff_ipod_muxer;
 extern AVInputFormat  ff_ircam_demuxer;
 extern AVOutputFormat ff_ircam_muxer;
diff --git a/libavformat/ipudec.c b/libavformat/ipudec.c
new file mode 100644
index 0000000000..df53df00d9
--- /dev/null
+++ 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,
+};
-- 
2.17.1