early-access version 1432

2021-02-09 04:25:58 +01:00
parent de64eab4b4
commit 3d5a9d908a
7336 changed files with 1773492 additions and 111 deletions
--- a/externals/ffmpeg/libavformat/dtsdec.c
+++ b/externals/ffmpeg/libavformat/dtsdec.c
@@ -0,0 +1,146 @@
+/*
+ * RAW DTS demuxer
+ * Copyright (c) 2008 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/crc.h"
+
+#include "libavcodec/bytestream.h"
+#include "libavcodec/dca.h"
+#include "libavcodec/dca_syncwords.h"
+#include "libavcodec/get_bits.h"
+
+#include "avformat.h"
+#include "rawdec.h"
+
+static int dts_probe(const AVProbeData *p)
+{
+    const uint8_t *buf, *bufp;
+    uint32_t state = -1;
+    int markers[4*16] = {0};
+    int exss_markers = 0, exss_nextpos = 0;
+    int sum, max, pos, ret, i;
+    int64_t diff = 0;
+    int diffcount = 1;
+    uint8_t hdr[DCA_CORE_FRAME_HEADER_SIZE + AV_INPUT_BUFFER_PADDING_SIZE] = { 0 };
+
+    for (pos = FFMIN(4096, p->buf_size); pos < p->buf_size - 2; pos += 2) {
+        int marker, wide_hdr, hdr_size, framesize;
+        DCACoreFrameHeader h;
+        GetBitContext gb;
+
+        bufp = buf = p->buf + pos;
+        state = (state << 16) | bytestream_get_be16(&bufp);
+
+        if (pos >= 4) {
+            if (AV_RL16(buf) || AV_RL16(buf-4)) {
+                diff += FFABS(((int16_t)AV_RL16(buf)) - (int16_t)AV_RL16(buf-4));
+                diffcount ++;
+            }
+        }
+
+        /* extension substream (EXSS) */
+        if (state == DCA_SYNCWORD_SUBSTREAM) {
+            if (pos < exss_nextpos)
+                continue;
+
+            init_get_bits(&gb, buf - 2, 96);
+            skip_bits_long(&gb, 42);
+
+            wide_hdr  = get_bits1(&gb);
+            hdr_size  = get_bits(&gb,  8 + 4 * wide_hdr) + 1;
+            framesize = get_bits(&gb, 16 + 4 * wide_hdr) + 1;
+            if (hdr_size & 3 || framesize & 3)
+                continue;
+            if (hdr_size < 16 || framesize < hdr_size)
+                continue;
+            if (pos - 2 + hdr_size > p->buf_size)
+                continue;
+            if (av_crc(av_crc_get_table(AV_CRC_16_CCITT), 0xffff, buf + 3, hdr_size - 5))
+                continue;
+
+            if (pos == exss_nextpos)
+                exss_markers++;
+            else
+                exss_markers = FFMAX(1, exss_markers - 1);
+            exss_nextpos = pos + framesize;
+            continue;
+        }
+
+        /* regular bitstream */
+        if (state == DCA_SYNCWORD_CORE_BE &&
+            (bytestream_get_be16(&bufp) & 0xFC00) == 0xFC00)
+            marker = 0;
+        else if (state == DCA_SYNCWORD_CORE_LE &&
+                 (bytestream_get_be16(&bufp) & 0x00FC) == 0x00FC)
+            marker = 1;
+
+        /* 14 bits big-endian bitstream */
+        else if (state == DCA_SYNCWORD_CORE_14B_BE &&
+                 (bytestream_get_be16(&bufp) & 0xFFF0) == 0x07F0)
+            marker = 2;
+
+        /* 14 bits little-endian bitstream */
+        else if (state == DCA_SYNCWORD_CORE_14B_LE &&
+                 (bytestream_get_be16(&bufp) & 0xF0FF) == 0xF007)
+            marker = 3;
+        else
+            continue;
+
+        if ((ret = avpriv_dca_convert_bitstream(buf - 2, DCA_CORE_FRAME_HEADER_SIZE,
+                                                hdr,     DCA_CORE_FRAME_HEADER_SIZE)) < 0)
+            continue;
+        if (avpriv_dca_parse_core_frame_header(&h, hdr, ret) < 0)
+            continue;
+
+        marker += 4 * h.sr_code;
+
+        markers[marker] ++;
+    }
+
+    if (exss_markers > 3)
+        return AVPROBE_SCORE_EXTENSION + 1;
+
+    sum = max = 0;
+    for (i=0; i<FF_ARRAY_ELEMS(markers); i++) {
+        sum += markers[i];
+        if (markers[max] < markers[i])
+            max = i;
+    }
+
+    if (markers[max] > 3 && p->buf_size / markers[max] < 32*1024 &&
+        markers[max] * 4 > sum * 3 &&
+        diff / diffcount > 600)
+        return AVPROBE_SCORE_EXTENSION + 1;
+
+    return 0;
+}
+
+FF_RAW_DEMUXER_CLASS(dts)
+AVInputFormat ff_dts_demuxer = {
+    .name           = "dts",
+    .long_name      = NULL_IF_CONFIG_SMALL("raw DTS"),
+    .read_probe     = dts_probe,
+    .read_header    = ff_raw_audio_read_header,
+    .read_packet    = ff_raw_read_partial_packet,
+    .flags          = AVFMT_GENERIC_INDEX,
+    .extensions     = "dts",
+    .raw_codec_id   = AV_CODEC_ID_DTS,
+    .priv_data_size = sizeof(FFRawDemuxerContext),
+    .priv_class     = &dts_demuxer_class,};