avformat: add hca demuxer

1 files changed, 124 insertions, 0 deletions

diff --git a/libavformat/hca.c b/libavformat/hca.c
new file mode 100644
index 0000000000..8f55e07204
--- /dev/null
+++ b/libavformat/hca.c
@@ -0,0 +1,124 @@
+/*
+ * HCA demuxer
+ * Copyright (c) 2020 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 "libavcodec/bytestream.h"
+
+#include "avformat.h"
+#include "internal.h"
+
+static int hca_probe(const AVProbeData *p)
+{
+    if (AV_RL32(p->buf) != MKTAG('H', 'C', 'A', 0))
+        return 0;
+
+    if (AV_RL32(p->buf + 8) != MKTAG('f', 'm', 't', 0))
+        return 0;
+
+    return AVPROBE_SCORE_MAX / 3;
+}
+
+static int hca_read_header(AVFormatContext *s)
+{
+    AVCodecParameters *par;
+    GetByteContext gb;
+    AVIOContext *pb = s->pb;
+    AVStream *st;
+    uint32_t chunk;
+    uint16_t version;
+    uint32_t block_count;
+    uint16_t block_size;
+    int ret;
+
+    avio_skip(pb, 4);
+    version = avio_rb16(pb);
+
+    s->internal->data_offset = avio_rb16(pb);
+    if (s->internal->data_offset <= 8)
+        return AVERROR_INVALIDDATA;
+
+    st = avformat_new_stream(s, NULL);
+    if (!st)
+        return AVERROR(ENOMEM);
+
+    par = st->codecpar;
+    ret = ff_alloc_extradata(par, s->internal->data_offset);
+    if (ret < 0)
+        return ret;
+
+    ret = avio_read(pb, par->extradata + 8, par->extradata_size - 8);
+    if (ret < par->extradata_size - 8)
+        return AVERROR(EIO);
+    AV_WL32(par->extradata, MKTAG('H', 'C', 'A', 0));
+    AV_WB16(par->extradata + 4, version);
+    AV_WB16(par->extradata + 6, s->internal->data_offset);
+
+    bytestream2_init(&gb, par->extradata + 8, par->extradata_size - 8);
+
+    if (bytestream2_get_le32(&gb) != MKTAG('f', 'm', 't', 0))
+        return AVERROR_INVALIDDATA;
+
+    par->codec_type  = AVMEDIA_TYPE_AUDIO;
+    par->codec_id    = AV_CODEC_ID_HCA;
+    par->codec_tag   = 0;
+    par->channels    = bytestream2_get_byte(&gb);
+    par->sample_rate = bytestream2_get_be24(&gb);
+    block_count      = bytestream2_get_be32(&gb);
+    bytestream2_skip(&gb, 4);
+    chunk = bytestream2_get_le32(&gb);
+    if (chunk == MKTAG('c', 'o', 'm', 'p')) {
+        block_size = bytestream2_get_be16(&gb);
+    } else if (chunk == MKTAG('d', 'e', 'c', 0)) {
+        block_size = bytestream2_get_be16(&gb);
+    } else {
+        return AVERROR_INVALIDDATA;
+    }
+
+    if (block_size < 8)
+        return AVERROR_INVALIDDATA;
+    par->block_align = block_size;
+    st->duration = 1024 * block_count;
+
+    avio_seek(pb, s->internal->data_offset, SEEK_SET);
+    avpriv_set_pts_info(st, 64, 1, par->sample_rate);
+
+    return 0;
+}
+
+static int hca_read_packet(AVFormatContext *s, AVPacket *pkt)
+{
+    AVCodecParameters *par = s->streams[0]->codecpar;
+    int ret;
+
+    ret = av_get_packet(s->pb, pkt, par->block_align);
+    pkt->duration = 1024;
+    return ret;
+}
+
+AVInputFormat ff_hca_demuxer = {
+    .name           = "hca",
+    .long_name      = NULL_IF_CONFIG_SMALL("CRI HCA"),
+    .read_probe     = hca_probe,
+    .read_header    = hca_read_header,
+    .read_packet    = hca_read_packet,
+    .extensions     = "hca",
+    .flags          = AVFMT_GENERIC_INDEX,
+};