[FFmpeg-devel] [PATCH 3/6] Add CRYO APC muxer

["Tomas Härdin" <git@haerdin.se>]

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From 14f3dd40a49ebf5ea020465732511e9d79a2e14a Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Tomas=20H=C3=A4rdin?= <git@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 <git@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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