From 14f3dd40a49ebf5ea020465732511e9d79a2e14a Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Tomas=20H=C3=A4rdin?= <g...@haerdin.se>
Date: Tue, 26 Dec 2023 14:32:10 +0100
Subject: [PATCH 3/6] Add CRYO APC muxer
---
Changelog | 1 +
doc/general_contents.texi | 2 +-
libavformat/Makefile | 1 +
libavformat/allformats.c | 1 +
libavformat/apcenc.c | 125 ++++++++++++++++++++++++++++++++++++++
libavformat/version.h | 2 +-
6 files changed, 130 insertions(+), 2 deletions(-)
create mode 100644 libavformat/apcenc.c
diff --git a/Changelog b/Changelog
index ca38546262..344bf4d1cf 100644
--- a/Changelog
+++ b/Changelog
@@ -3,6 +3,7 @@ releases are sorted from youngest to oldest.
version <next>:
- LEAD MCMP decoder
+- CRYO APC muxer
version 6.1:
- libaribcaption decoder
diff --git a/doc/general_contents.texi b/doc/general_contents.texi
index 3328753acb..a43736e3a8 100644
--- a/doc/general_contents.texi
+++ b/doc/general_contents.texi
@@ -448,7 +448,7 @@ library:
@item CRC testing format @tab X @tab
@item Creative Voice @tab X @tab X
@tab Created for the Sound Blaster Pro.
-@item CRYO APC @tab @tab X
+@item CRYO APC @tab X @tab X
@tab Audio format used in some games by CRYO Interactive Entertainment.
@item D-Cinema audio @tab X @tab X
@item Deluxe Paint Animation @tab @tab X
diff --git a/libavformat/Makefile b/libavformat/Makefile
index 329055ccfd..d88a65d713 100644
--- a/libavformat/Makefile
+++ b/libavformat/Makefile
@@ -105,6 +105,7 @@ OBJS-$(CONFIG_AMV_MUXER) += amvenc.o
OBJS-$(CONFIG_ANM_DEMUXER) += anm.o
OBJS-$(CONFIG_APAC_DEMUXER) += apac.o rawdec.o
OBJS-$(CONFIG_APC_DEMUXER) += apc.o
+OBJS-$(CONFIG_APC_MUXER) += apcenc.o
OBJS-$(CONFIG_APE_DEMUXER) += ape.o apetag.o img2.o
OBJS-$(CONFIG_APM_DEMUXER) += apm.o
OBJS-$(CONFIG_APM_MUXER) += apm.o rawenc.o
diff --git a/libavformat/allformats.c b/libavformat/allformats.c
index d4b505a5a3..ab74c2028f 100644
--- a/libavformat/allformats.c
+++ b/libavformat/allformats.c
@@ -60,6 +60,7 @@ extern const FFOutputFormat ff_amv_muxer;
extern const AVInputFormat ff_anm_demuxer;
extern const AVInputFormat ff_apac_demuxer;
extern const AVInputFormat ff_apc_demuxer;
+extern const FFOutputFormat ff_apc_muxer;
extern const AVInputFormat ff_ape_demuxer;
extern const AVInputFormat ff_apm_demuxer;
extern const FFOutputFormat ff_apm_muxer;
diff --git a/libavformat/apcenc.c b/libavformat/apcenc.c
new file mode 100644
index 0000000000..ba024ead50
--- /dev/null
+++ b/libavformat/apcenc.c
@@ -0,0 +1,125 @@
+/*
+ * CRYO APC audio format muxer
+ * Copyright (c) 2023 Tomas Härdin <g...@haerdin.se>
+ *
+ * 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 "avio_internal.h"
+#include "internal.h"
+#include "mux.h"
+
+#define APC_HEADER_SIZE (8*4)
+
+static int apc_write_header(AVFormatContext *s)
+{
+ AVIOContext *pb = s->pb;
+ AVCodecParameters *par;
+ AVStream *st;
+
+ if (s->nb_streams != 1) {
+ av_log(s, AV_LOG_ERROR, "Must have exactly one stream\n");
+ return AVERROR(EINVAL);
+ }
+
+ st = s->streams[0];
+ par = st->codecpar;
+
+ if (par->ch_layout.nb_channels <= 0 || par->ch_layout.nb_channels > 2) {
+ av_log(s, AV_LOG_ERROR, "Must be mono or stereo\n");
+ return AVERROR(EINVAL);
+ }
+
+ if (par->extradata_size != 0 && par->extradata_size != 8) {
+ av_log(s, AV_LOG_ERROR,
+ "Must have exactly 0 or 8 bytes of extradata, got %i\n",
+ par->extradata_size);
+ return AVERROR(EINVAL);
+ }
+
+ ffio_wfourcc(pb, "CRYO");
+ ffio_wfourcc(pb, "_APC");
+ ffio_wfourcc(pb, "1.20");
+ avio_wl32(pb, 0); // number or samples
+ avio_wl32(pb, par->sample_rate);
+
+ // write extradata if we have it (remuxing)
+ // else write dummy values and wait for AV_PKT_DATA_NEW_EXTRADATA (encoding)
+ if (par->extradata_size) {
+ avio_write(pb, par->extradata, par->extradata_size);
+ } else {
+ avio_wl64(pb, 0);
+ }
+
+ avio_wl32(pb, par->ch_layout.nb_channels - 1);
+ avpriv_set_pts_info(st, 64, 1, par->sample_rate);
+ return 0;
+}
+
+static int apc_write_packet(AVFormatContext *s, AVPacket *pkt)
+{
+ size_t extradata_size = 0;
+ const uint8_t *extradata = av_packet_get_side_data(
+ pkt, AV_PKT_DATA_NEW_EXTRADATA, &extradata_size);
+
+ if (extradata_size == 8) {
+ // we got predictors from encoder
+ // try to seek back end write them
+ int64_t pos = avio_tell(s->pb), err;
+ if ((err = avio_seek(s->pb, 20, SEEK_SET)) >= 0) {
+ avio_write(s->pb, extradata, extradata_size);
+ avio_seek(s->pb, pos, SEEK_SET);
+ } else {
+ av_log(s, AV_LOG_ERROR, "Got predictors from encoder but couldn't seek back to write them\n");
+ // fail since we should always be able to do this within the avio cache
+ // unless the encoder gave us predictors way too late for some reason
+ return err;
+ }
+ }
+
+ avio_write(s->pb, pkt->data, pkt->size);
+ return 0;
+}
+
+static int apc_write_trailer(AVFormatContext *s)
+{
+ int64_t file_size = avio_tell(s->pb);
+
+ // write length, if we're able to seek back
+ if (avio_seek(s->pb, 12, SEEK_SET) >= 0) {
+ if (file_size - APC_HEADER_SIZE >
+ UINT32_MAX * s->streams[0]->codecpar->ch_layout.nb_channels / 2) {
+ av_log(s, AV_LOG_ERROR, "File too large\n");
+ return AVERROR(EINVAL);
+ }
+
+ avio_wl32(s->pb, (file_size - APC_HEADER_SIZE) *
+ 2 / s->streams[0]->codecpar->ch_layout.nb_channels);
+ }
+ return 0;
+}
+
+const FFOutputFormat ff_apc_muxer = {
+ .p.name = "apc",
+ .p.long_name = NULL_IF_CONFIG_SMALL("CRYO APC"),
+ .p.extensions = "apc",
+ .p.audio_codec = AV_CODEC_ID_ADPCM_IMA_APC,
+ .write_header = apc_write_header,
+ .write_packet = apc_write_packet,
+ .write_trailer = apc_write_trailer,
+};
+
diff --git a/libavformat/version.h b/libavformat/version.h
index 2a28a3bf40..6a80f3ac4e 100644
--- a/libavformat/version.h
+++ b/libavformat/version.h
@@ -31,7 +31,7 @@
#include "version_major.h"
-#define LIBAVFORMAT_VERSION_MINOR 17
+#define LIBAVFORMAT_VERSION_MINOR 18
#define LIBAVFORMAT_VERSION_MICRO 100
#define LIBAVFORMAT_VERSION_INT AV_VERSION_INT(LIBAVFORMAT_VERSION_MAJOR, \
--
2.39.2
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