[FFmpeg-devel] [PATCH 2/2] avformat: add Simbiosis IMX demuxer
Paul B Mahol
onemda at gmail.com
Wed Feb 17 21:42:37 EET 2021
Signed-off-by: Paul B Mahol <onemda at gmail.com>
---
libavformat/Makefile | 1 +
libavformat/allformats.c | 1 +
libavformat/imx.c | 160 +++++++++++++++++++++++++++++++++++++++
3 files changed, 162 insertions(+)
create mode 100644 libavformat/imx.c
diff --git a/libavformat/Makefile b/libavformat/Makefile
index 7bbf000cdc..e4d1f82c78 100644
--- a/libavformat/Makefile
+++ b/libavformat/Makefile
@@ -504,6 +504,7 @@ OBJS-$(CONFIG_SEGMENT_MUXER) += segment.o
OBJS-$(CONFIG_SER_DEMUXER) += serdec.o
OBJS-$(CONFIG_SHORTEN_DEMUXER) += shortendec.o rawdec.o
OBJS-$(CONFIG_SIFF_DEMUXER) += siff.o
+OBJS-$(CONFIG_SIMBIOSIS_IMX_DEMUXER) += imx.o
OBJS-$(CONFIG_SINGLEJPEG_MUXER) += rawenc.o
OBJS-$(CONFIG_SLN_DEMUXER) += pcmdec.o pcm.o
OBJS-$(CONFIG_SMACKER_DEMUXER) += smacker.o
diff --git a/libavformat/allformats.c b/libavformat/allformats.c
index f837ddabc8..3b69423508 100644
--- a/libavformat/allformats.c
+++ b/libavformat/allformats.c
@@ -403,6 +403,7 @@ extern AVOutputFormat ff_stream_segment_muxer;
extern AVInputFormat ff_ser_demuxer;
extern AVInputFormat ff_shorten_demuxer;
extern AVInputFormat ff_siff_demuxer;
+extern AVInputFormat ff_simbiosis_imx_demuxer;
extern AVOutputFormat ff_singlejpeg_muxer;
extern AVInputFormat ff_sln_demuxer;
extern AVInputFormat ff_smacker_demuxer;
diff --git a/libavformat/imx.c b/libavformat/imx.c
new file mode 100644
index 0000000000..66f18177a5
--- /dev/null
+++ b/libavformat/imx.c
@@ -0,0 +1,160 @@
+/*
+ * Simbiosis game demuxer
+ *
+ * Copyright (C) 2021 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 "libavutil/intreadwrite.h"
+#include "libavutil/avassert.h"
+#include "libavutil/internal.h"
+#include "argo_asf.h"
+
+#define IMX_TAG MKTAG('I', 'M', 'A', 'X')
+
+typedef struct SimbiosisIMXDemuxContext {
+ uint8_t pal[AVPALETTE_SIZE];
+ int pal_changed;
+} SimbiosisIMXDemuxContext;
+
+static int simbiosis_imx_probe(const AVProbeData *p)
+{
+ if (AV_RL32(p->buf) != IMX_TAG)
+ return 0;
+ if (AV_RN32(p->buf+4) == 0)
+ return 0;
+ if (AV_RN16(p->buf+8) == 0)
+ return 0;
+ if (AV_RL16(p->buf+10) != 0x102)
+ return 0;
+
+ return AVPROBE_SCORE_EXTENSION + 10;
+}
+
+static int simbiosis_imx_read_header(AVFormatContext *s)
+{
+ AVIOContext *pb = s->pb;
+ AVStream *vst, *ast;
+ int rate;
+
+ vst = avformat_new_stream(s, NULL);
+ ast = avformat_new_stream(s, NULL);
+ if (!vst || !ast)
+ return AVERROR(ENOMEM);
+
+ avio_skip(pb, 4);
+
+ vst->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
+ vst->codecpar->codec_tag = 0;
+ vst->codecpar->format = AV_PIX_FMT_PAL8;
+ vst->codecpar->codec_id = AV_CODEC_ID_SIMBIOSIS_IMX;
+ vst->start_time = 0;
+ vst->nb_frames = avio_rl32(pb);
+ rate = avio_rl16(pb);
+ avio_skip(pb, 12);
+
+ avpriv_set_pts_info(vst, 64, 1, rate);
+
+ ast->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
+ ast->codecpar->codec_tag = 0;
+ ast->codecpar->codec_id = AV_CODEC_ID_PCM_U8;
+ ast->codecpar->channels = 1;
+ ast->codecpar->channel_layout = AV_CH_LAYOUT_MONO;
+ ast->codecpar->sample_rate = 22050;
+ ast->start_time = 0;
+
+ avpriv_set_pts_info(ast, 64, 1, 22050);
+
+ return 0;
+}
+
+static int simbiosis_imx_read_packet(AVFormatContext *s, AVPacket *pkt)
+{
+ AVIOContext *pb = s->pb;
+ SimbiosisIMXDemuxContext *imx = s->priv_data;
+ uint32_t chunk_size, chunk_type;
+ int64_t pos = avio_tell(pb);
+ int ret, idx = -1;
+
+retry:
+ if (avio_feof(pb))
+ return AVERROR_EOF;
+
+ chunk_size = avio_rl32(pb);
+ chunk_type = avio_rl32(pb);
+
+ switch (chunk_type) {
+ case 0xAAFF:
+ return AVERROR_EOF;
+ case 0xAA99:
+ idx = 1;
+ break;
+ case 0xAA97:
+ idx = 0;
+ break;
+ case 0xAA98:
+ for (int i = 0; i < chunk_size / 3; i++) {
+ unsigned r = avio_r8(pb) << 18;
+ unsigned g = avio_r8(pb) << 10;
+ unsigned b = avio_r8(pb) << 2;
+
+ AV_WL32(imx->pal + i * 4, (0xFFU << 24) | r | g | b);
+ }
+ imx->pal_changed = 1;
+ idx = -1;
+ break;
+ default:
+ return AVERROR_INVALIDDATA;
+ }
+
+ if (idx == -1)
+ goto retry;
+
+ ret = av_get_packet(pb, pkt, chunk_size);
+ if (ret < 0)
+ return ret;
+
+ if (imx->pal_changed && idx == 0) {
+ uint8_t *pal = av_packet_new_side_data(pkt, AV_PKT_DATA_PALETTE,
+ AVPALETTE_SIZE);
+ if (!pal)
+ return AVERROR(ENOMEM);
+ memcpy(pal, imx->pal, AVPALETTE_SIZE);
+ imx->pal_changed = 0;
+ pkt->flags |= AV_PKT_FLAG_KEY;
+ }
+
+ pkt->pos = pos;
+ pkt->stream_index = idx;
+ pkt->duration = idx ? chunk_size : 1;
+
+ return ret;
+}
+
+AVInputFormat ff_simbiosis_imx_demuxer = {
+ .name = "simbiosis_imx",
+ .long_name = NULL_IF_CONFIG_SMALL("Simbiosis Interactive IMX"),
+ .priv_data_size = sizeof(SimbiosisIMXDemuxContext),
+ .read_probe = simbiosis_imx_probe,
+ .read_header = simbiosis_imx_read_header,
+ .read_packet = simbiosis_imx_read_packet,
+ .extensions = "imx",
+ .flags = AVFMT_GENERIC_INDEX,
+};
--
2.17.1
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