This allows to (re)mux Sony ATRAC1 files.
Patch attached
>From fd2c5b70c202fd11d48efc5ed4366093351eb0de Mon Sep 17 00:00:00 2001
From: Lynne <d...@lynne.ee>
Date: Fri, 26 Feb 2021 06:25:41 +0100
Subject: [PATCH 2/2] aeaenc: add an aea muxer
This allows to (re)mux Sony ATRAC1 files.
---
libavformat/Makefile | 1 +
libavformat/aeaenc.c | 107 +++++++++++++++++++++++++++++++++++++++
libavformat/allformats.c | 1 +
3 files changed, 109 insertions(+)
create mode 100644 libavformat/aeaenc.c
diff --git a/libavformat/Makefile b/libavformat/Makefile
index 10fee749c8..aced6edba5 100644
--- a/libavformat/Makefile
+++ b/libavformat/Makefile
@@ -80,6 +80,7 @@ OBJS-$(CONFIG_ADTS_MUXER) += adtsenc.o apetag.o img2.o \
OBJS-$(CONFIG_ADX_DEMUXER) += adxdec.o
OBJS-$(CONFIG_ADX_MUXER) += rawenc.o
OBJS-$(CONFIG_AEA_DEMUXER) += aea.o pcm.o
+OBJS-$(CONFIG_AEA_MUXER) += aeaenc.o rawenc.o
OBJS-$(CONFIG_AFC_DEMUXER) += afc.o
OBJS-$(CONFIG_AIFF_DEMUXER) += aiffdec.o pcm.o isom.o \
mov_chan.o replaygain.o
diff --git a/libavformat/aeaenc.c b/libavformat/aeaenc.c
new file mode 100644
index 0000000000..c25adc15d4
--- /dev/null
+++ b/libavformat/aeaenc.c
@@ -0,0 +1,107 @@
+/*
+ * 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 "libavutil/intreadwrite.h"
+#include "avformat.h"
+#include "rawenc.h"
+
+#define AT1_SU_SIZE 212
+
+typedef struct AEAEncContext {
+ uint32_t frame_cnt;
+} AEAEncContext;
+
+static int aea_write_header(AVFormatContext *s)
+{
+ AVDictionaryEntry *dtmp;
+ AVCodecParameters *par = s->streams[0]->codecpar;
+ AVIOContext *pb = s->pb;
+
+ if (par->channels != 1 && par->channels != 2) {
+ av_log(s, AV_LOG_ERROR, "Unsupported number of channels %i!\n", par->channels);
+ return AVERROR(EINVAL);
+ }
+
+ if (par->sample_rate != 44100) {
+ av_log(s, AV_LOG_ERROR, "Unsupported samplerate %i!\n", par->sample_rate);
+ return AVERROR(EINVAL);
+ }
+
+ if (par->block_align != (AT1_SU_SIZE * par->channels)) {
+ av_log(s, AV_LOG_ERROR, "Unsupported block align %i!\n", par->block_align);
+ return AVERROR(EINVAL);
+ }
+
+ avio_wl32(pb, 0x800); // magic
+
+ dtmp = av_dict_get(s->metadata, "title", NULL, 0);
+ if (dtmp) {
+ int len = FFMIN(strlen(dtmp->value), 15);
+ avio_write(pb, dtmp->value, len);
+ for (int i = 0; i < (16 - len); i++)
+ avio_w8(pb, 0);
+ } else {
+ avio_wl64(pb, 0);
+ avio_wl64(pb, 0);
+ }
+
+ avio_skip(pb, 240); // not needed
+
+ avio_wl32(pb, 0); // #frames field overwritten when closing
+ avio_w8 (pb, par->channels); // Number of channels
+
+ /* Skip to 2048 */
+ avio_skip(pb, 2048 - avio_tell(pb));
+
+ return 0;
+}
+
+static int aea_write_packet(AVFormatContext *s, AVPacket *pkt)
+{
+ AEAEncContext *ctx = s->priv_data;
+ ctx->frame_cnt++;
+ return ff_raw_write_packet(s, pkt);
+}
+
+static int aea_write_trailer(AVFormatContext *s)
+{
+ AVIOContext *pb = s->pb;
+ AEAEncContext *ctx = s->priv_data;
+
+ if ((pb->seekable & AVIO_SEEKABLE_NORMAL) && ctx->frame_cnt > 1) {
+ int64_t end = avio_tell(pb);
+
+ avio_seek(pb, 260, SEEK_SET);
+ avio_wl32(pb, ctx->frame_cnt);
+ avio_seek(pb, end, SEEK_SET);
+ }
+
+ return 0;
+}
+
+AVOutputFormat ff_aea_muxer = {
+ .name = "aea",
+ .long_name = NULL_IF_CONFIG_SMALL("MD STUDIO audio"),
+ .priv_data_size = sizeof(AEAEncContext),
+ .extensions = "aea",
+ .audio_codec = AV_CODEC_ID_ATRAC1,
+ .write_header = aea_write_header,
+ .write_packet = aea_write_packet,
+ .write_trailer = aea_write_trailer,
+ .flags = AVFMT_NOTIMESTAMPS,
+};
diff --git a/libavformat/allformats.c b/libavformat/allformats.c
index f837ddabc8..6501a5d2f5 100644
--- a/libavformat/allformats.c
+++ b/libavformat/allformats.c
@@ -44,6 +44,7 @@ extern AVOutputFormat ff_adts_muxer;
extern AVInputFormat ff_adx_demuxer;
extern AVOutputFormat ff_adx_muxer;
extern AVInputFormat ff_aea_demuxer;
+extern AVOutputFormat ff_aea_muxer;
extern AVInputFormat ff_afc_demuxer;
extern AVInputFormat ff_aiff_demuxer;
extern AVOutputFormat ff_aiff_muxer;
--
2.30.1
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