early-access version 1432

externals/ffmpeg/libavformat/dtshddec.c

@@ -0,0 +1,172 @@
+/*
+ * Raw DTS-HD demuxer
+ * Copyright (c) 2012 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 "libavutil/dict.h"
+#include "libavcodec/dca.h"
+#include "avformat.h"
+#include "internal.h"
+
+#define AUPR_HDR 0x415550522D484452
+#define AUPRINFO 0x41555052494E464F
+#define BITSHVTB 0x4249545348565442
+#define BLACKOUT 0x424C41434B4F5554
+#define BRANCHPT 0x4252414E43485054
+#define BUILDVER 0x4255494C44564552
+#define CORESSMD 0x434F524553534D44
+#define DTSHDHDR 0x4454534844484452
+#define EXTSS_MD 0x45585453535f4d44
+#define FILEINFO 0x46494C45494E464F
+#define NAVI_TBL 0x4E4156492D54424C
+#define STRMDATA 0x5354524D44415441
+#define TIMECODE 0x54494D45434F4445
+
+typedef struct DTSHDDemuxContext {
+    uint64_t    data_end;
+} DTSHDDemuxContext;
+
+static int dtshd_probe(const AVProbeData *p)
+{
+    if (AV_RB64(p->buf) == DTSHDHDR)
+        return AVPROBE_SCORE_MAX;
+    return 0;
+}
+
+static int dtshd_read_header(AVFormatContext *s)
+{
+    DTSHDDemuxContext *dtshd = s->priv_data;
+    AVIOContext *pb = s->pb;
+    uint64_t chunk_type, chunk_size;
+    int64_t duration, data_start;
+    AVStream *st;
+    int ret;
+    char *value;
+
+    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_DTS;
+    st->need_parsing         = AVSTREAM_PARSE_FULL_RAW;
+
+    for (;;) {
+        chunk_type = avio_rb64(pb);
+        chunk_size = avio_rb64(pb);
+
+        if (avio_feof(pb))
+            break;
+
+        if (chunk_size < 4) {
+            av_log(s, AV_LOG_ERROR, "chunk size too small\n");
+            return AVERROR_INVALIDDATA;
+        }
+        if (chunk_size > ((uint64_t)1 << 61)) {
+            av_log(s, AV_LOG_ERROR, "chunk size too big\n");
+            return AVERROR_INVALIDDATA;
+        }
+
+        switch (chunk_type) {
+        case STRMDATA:
+            data_start = avio_tell(pb);
+            dtshd->data_end = data_start + chunk_size;
+            if (dtshd->data_end <= chunk_size)
+                return AVERROR_INVALIDDATA;
+            if (!(pb->seekable & AVIO_SEEKABLE_NORMAL))
+                goto break_loop;
+            goto skip;
+            break;
+        case AUPR_HDR:
+            if (chunk_size < 21)
+                return AVERROR_INVALIDDATA;
+            avio_skip(pb, 3);
+            st->codecpar->sample_rate = avio_rb24(pb);
+            if (!st->codecpar->sample_rate)
+                return AVERROR_INVALIDDATA;
+            duration  = avio_rb32(pb); // num_frames
+            duration *= avio_rb16(pb); // samples_per_frames
+            st->duration = duration;
+            avio_skip(pb, 5);
+            st->codecpar->channels = ff_dca_count_chs_for_mask(avio_rb16(pb));
+            st->codecpar->initial_padding = avio_rb16(pb);
+            avio_skip(pb, chunk_size - 21);
+            break;
+        case FILEINFO:
+            if (chunk_size > INT_MAX)
+                goto skip;
+            value = av_malloc(chunk_size);
+            if (!value)
+                goto skip;
+            avio_read(pb, value, chunk_size);
+            value[chunk_size - 1] = 0;
+            av_dict_set(&s->metadata, "fileinfo", value,
+                        AV_DICT_DONT_STRDUP_VAL);
+            break;
+        default:
+skip:
+            ret = avio_skip(pb, chunk_size);
+            if (ret < 0)
+                return ret;
+        };
+    }
+
+    if (!dtshd->data_end)
+        return AVERROR_EOF;
+
+    avio_seek(pb, data_start, SEEK_SET);
+
+break_loop:
+    if (st->codecpar->sample_rate)
+        avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);
+
+    return 0;
+}
+
+static int raw_read_packet(AVFormatContext *s, AVPacket *pkt)
+{
+    DTSHDDemuxContext *dtshd = s->priv_data;
+    int64_t size, left;
+    int ret;
+
+    left = dtshd->data_end - avio_tell(s->pb);
+    size = FFMIN(left, 1024);
+    if (size <= 0)
+        return AVERROR_EOF;
+
+    ret = av_get_packet(s->pb, pkt, size);
+    if (ret < 0)
+        return ret;
+
+    pkt->stream_index = 0;
+
+    return ret;
+}
+
+AVInputFormat ff_dtshd_demuxer = {
+    .name           = "dtshd",
+    .long_name      = NULL_IF_CONFIG_SMALL("raw DTS-HD"),
+    .priv_data_size = sizeof(DTSHDDemuxContext),
+    .read_probe     = dtshd_probe,
+    .read_header    = dtshd_read_header,
+    .read_packet    = raw_read_packet,
+    .flags          = AVFMT_GENERIC_INDEX,
+    .extensions     = "dtshd",
+    .raw_codec_id   = AV_CODEC_ID_DTS,
+};