From d2d7ed7a0539424fe3dd72fdc68a95840d54123b Mon Sep 17 00:00:00 2001
From: Paul B Mahol <onemda@gmail.com>
Date: Mon, 19 Sep 2022 22:05:20 +0200
Subject: [PATCH 2/2] avformat: add APAC demuxer
Signed-off-by: Paul B Mahol <onemda@gmail.com>
---
libavformat/Makefile | 1 +
libavformat/allformats.c | 1 +
libavformat/apac.c | 85 ++++++++++++++++++++++++++++++++++++++++
3 files changed, 87 insertions(+)
create mode 100644 libavformat/apac.c
@@ -101,6 +101,7 @@ OBJS-$(CONFIG_AMRNB_DEMUXER) += amr.o rawdec.o
OBJS-$(CONFIG_AMRWB_DEMUXER) += amr.o rawdec.o
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-$(CONFIG_APE_DEMUXER) += ape.o apetag.o img2.o
OBJS-$(CONFIG_APM_DEMUXER) += apm.o
@@ -52,6 +52,7 @@ extern const AVInputFormat ff_amrnb_demuxer;
extern const AVInputFormat ff_amrwb_demuxer;
extern const AVOutputFormat ff_amv_muxer;
extern const AVInputFormat ff_anm_demuxer;
+extern const AVInputFormat ff_apac_demuxer;
extern const AVInputFormat ff_apc_demuxer;
extern const AVInputFormat ff_ape_demuxer;
extern const AVInputFormat ff_apm_demuxer;
new file mode 100644
@@ -0,0 +1,85 @@
+/*
+ * APAC demuxer
+ * Copyright (c) 2022 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 "libavutil/intreadwrite.h"
+#include "avformat.h"
+#include "demux.h"
+#include "internal.h"
+#include "rawdec.h"
+
+static int apac_probe(const AVProbeData *p)
+{
+ if (AV_RB32(p->buf) == MKBETAG('A','P','A','C') &&
+ AV_RB32(p->buf + 8) == MKBETAG('P','R','O','F') &&
+ AV_RB32(p->buf + 12) == MKBETAG('N','A','D',' '))
+ return AVPROBE_SCORE_MAX;
+
+ return 0;
+}
+
+static int apac_read_header(AVFormatContext *s)
+{
+ AVIOContext *pb = s->pb;
+ uint32_t chunk_size;
+ AVStream *st;
+ int64_t pos;
+
+ avio_skip(pb, 16);
+ chunk_size = avio_rl32(pb);
+ avio_skip(pb, chunk_size);
+ if (avio_rb32(pb) != MKBETAG('P','F','M','T'))
+ return AVERROR_INVALIDDATA;
+ chunk_size = avio_rl32(pb);
+ pos = avio_tell(pb);
+ avio_skip(pb, 2);
+ st = avformat_new_stream(s, NULL);
+ if (!st)
+ return AVERROR(ENOMEM);
+ st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
+ st->codecpar->codec_id = AV_CODEC_ID_APAC;
+ st->codecpar->ch_layout.nb_channels = avio_rl16(pb);
+ st->codecpar->sample_rate = avio_rl32(pb);
+ if (st->codecpar->ch_layout.nb_channels <= 0 ||
+ st->codecpar->sample_rate <= 0)
+ return AVERROR_INVALIDDATA;
+ avio_skip(pb, 2);
+ st->codecpar->bits_per_coded_sample = avio_rl16(pb);
+ avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);
+ avio_skip(pb, (chunk_size + pos) - avio_tell(pb) + (chunk_size & 1));
+ if (avio_rb32(pb) != MKBETAG('P','A','D',' '))
+ return AVERROR_INVALIDDATA;
+ avio_skip(pb, 4);
+
+ return 0;
+}
+
+const AVInputFormat ff_apac_demuxer = {
+ .name = "apac",
+ .long_name = NULL_IF_CONFIG_SMALL("raw APAC"),
+ .read_probe = apac_probe,
+ .read_header = apac_read_header,
+ .read_packet = ff_raw_read_partial_packet,
+ .extensions = "apc",
+ .flags = AVFMT_NOBINSEARCH | AVFMT_NOGENSEARCH | AVFMT_NO_BYTE_SEEK | AVFMT_NOTIMESTAMPS,
+ .raw_codec_id = AV_CODEC_ID_APAC,
+ .priv_data_size = sizeof(FFRawDemuxerContext),
+ .priv_class = &ff_raw_demuxer_class,
+};
--
2.37.2