Update ffmpeg to 7.1.1

submodules/ffmpeg/Sources/FFMpeg/ffmpeg-7.1.1/libavformat/aeadec.c

@@ -0,0 +1,113 @@
+/*
+ * MD STUDIO audio demuxer
+ *
+ * Copyright (c) 2009 Benjamin Larsson
+ *
+ * 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/channel_layout.h"
+#include "libavutil/intreadwrite.h"
+#include "avformat.h"
+#include "avio_internal.h"
+#include "demux.h"
+#include "internal.h"
+#include "pcm.h"
+
+#define AT1_SU_SIZE 212
+
+static int aea_read_probe(const AVProbeData *p)
+{
+    if (p->buf_size <= 2048+AT1_SU_SIZE)
+        return 0;
+
+    /* Magic is '00 08 00 00' in little-endian*/
+    if (AV_RL32(p->buf)==0x800) {
+        int ch, block_size, score = 0;
+        ch = p->buf[264];
+
+        if (ch != 1 && ch != 2)
+            return 0;
+
+        block_size = ch * AT1_SU_SIZE;
+        /* Check so that the redundant bsm bytes and info bytes are valid
+         * the block size mode bytes have to be the same
+         * the info bytes have to be the same
+         */
+        for (int i = 2048 + block_size; i + block_size <= p->buf_size; i += block_size) {
+            if (AV_RN16(p->buf+i) != AV_RN16(p->buf+i+AT1_SU_SIZE))
+                return 0;
+            score++;
+        }
+        return FFMIN(AVPROBE_SCORE_MAX / 4 + score, AVPROBE_SCORE_MAX);
+    }
+    return 0;
+}
+
+static int aea_read_header(AVFormatContext *s)
+{
+    AVStream *st = avformat_new_stream(s, NULL);
+    char title[256 + 1];
+    int channels, ret;
+    if (!st)
+        return AVERROR(ENOMEM);
+
+    /* Read the title, parse the number of channels and skip to pos 2048(0x800) */
+    avio_rl32(s->pb); // magic
+    ret = ffio_read_size(s->pb, title, sizeof(title) - 1);
+    if (ret < 0)
+        return ret;
+    title[sizeof(title) - 1] = '\0';
+    if (title[0] != '\0')
+        av_dict_set(&st->metadata, "title", title, 0);
+    avio_rl32(s->pb); // Block count
+    channels = avio_r8(s->pb);
+    avio_skip(s->pb, 1783);
+
+
+    st->codecpar->codec_type     = AVMEDIA_TYPE_AUDIO;
+    st->codecpar->codec_id       = AV_CODEC_ID_ATRAC1;
+    st->codecpar->sample_rate    = 44100;
+    st->codecpar->bit_rate       = 146000 * channels;
+
+    if (channels != 1 && channels != 2) {
+        av_log(s, AV_LOG_ERROR, "Channels %d not supported!\n", channels);
+        return AVERROR_INVALIDDATA;
+    }
+
+    av_channel_layout_default(&st->codecpar->ch_layout, channels);
+
+    st->codecpar->block_align = AT1_SU_SIZE * st->codecpar->ch_layout.nb_channels;
+    avpriv_set_pts_info(st, 64, 1, 44100);
+    return 0;
+}
+
+static int aea_read_packet(AVFormatContext *s, AVPacket *pkt)
+{
+    return av_get_packet(s->pb, pkt, s->streams[0]->codecpar->block_align);
+}
+
+const FFInputFormat ff_aea_demuxer = {
+    .p.name         = "aea",
+    .p.long_name    = NULL_IF_CONFIG_SMALL("MD STUDIO audio"),
+    .p.flags        = AVFMT_GENERIC_INDEX,
+    .p.extensions   = "aea",
+    .read_probe     = aea_read_probe,
+    .read_header    = aea_read_header,
+    .read_packet    = aea_read_packet,
+    .read_seek      = ff_pcm_read_seek,
+};