[FFmpeg-devel] [PATCH 7/7] avformat: add hca demuxer
Paul B Mahol
onemda at gmail.com
Sun Mar 15 20:22:06 EET 2020
Signed-off-by: Paul B Mahol <onemda at gmail.com>
---
libavformat/Makefile | 1 +
libavformat/allformats.c | 1 +
libavformat/hca.c | 144 +++++++++++++++++++++++++++++++++++++++
3 files changed, 146 insertions(+)
create mode 100644 libavformat/hca.c
diff --git a/libavformat/Makefile b/libavformat/Makefile
index 27615cd746..5196f998ed 100644
--- a/libavformat/Makefile
+++ b/libavformat/Makefile
@@ -224,6 +224,7 @@ OBJS-$(CONFIG_H263_MUXER) += rawenc.o
OBJS-$(CONFIG_H264_DEMUXER) += h264dec.o rawdec.o
OBJS-$(CONFIG_H264_MUXER) += rawenc.o
OBJS-$(CONFIG_HASH_MUXER) += hashenc.o
+OBJS-$(CONFIG_HCA_DEMUXER) += hca.o
OBJS-$(CONFIG_HCOM_DEMUXER) += hcom.o pcm.o
OBJS-$(CONFIG_HDS_MUXER) += hdsenc.o
OBJS-$(CONFIG_HEVC_DEMUXER) += hevcdec.o rawdec.o
diff --git a/libavformat/allformats.c b/libavformat/allformats.c
index af10def88b..39d2c352f5 100644
--- a/libavformat/allformats.c
+++ b/libavformat/allformats.c
@@ -182,6 +182,7 @@ extern AVOutputFormat ff_h263_muxer;
extern AVInputFormat ff_h264_demuxer;
extern AVOutputFormat ff_h264_muxer;
extern AVOutputFormat ff_hash_muxer;
+extern AVInputFormat ff_hca_demuxer;
extern AVInputFormat ff_hcom_demuxer;
extern AVOutputFormat ff_hds_muxer;
extern AVInputFormat ff_hevc_demuxer;
diff --git a/libavformat/hca.c b/libavformat/hca.c
new file mode 100644
index 0000000000..000833f55d
--- /dev/null
+++ b/libavformat/hca.c
@@ -0,0 +1,144 @@
+/*
+ * HCA demuxer
+ * Copyright (c) 2016 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 "internal.h"
+
+static int hca_probe(const AVProbeData *p)
+{
+ if (AV_RL32(p->buf) != MKTAG('H', 'C', 'A', 0))
+ return 0;
+
+ return AVPROBE_SCORE_MAX / 3;
+}
+
+static int hca_read_header(AVFormatContext *s)
+{
+ AVCodecParameters *par;
+ AVIOContext *pb = s->pb;
+ AVStream *st;
+ uint32_t chunk;
+ uint16_t version;
+ uint32_t block_count;
+ uint16_t block_size;
+ int ath_type;
+
+ avio_skip(pb, 4);
+ version = avio_rb16(pb);
+ ath_type = version < 0x200 ? 1 : 0;
+ s->internal->data_offset = avio_rb16(pb);
+
+ if (avio_rl32(pb) != MKTAG('f', 'm', 't', 0))
+ return AVERROR_INVALIDDATA;
+
+ st = avformat_new_stream(s, NULL);
+ if (!st)
+ return AVERROR(ENOMEM);
+
+ par = st->codecpar;
+ par->codec_type = AVMEDIA_TYPE_AUDIO;
+ par->codec_id = AV_CODEC_ID_HCA;
+ par->codec_tag = 0;
+ par->channels = avio_r8(pb);
+ par->sample_rate = avio_rb24(pb);
+ block_count = avio_rb32(pb);
+ avio_skip(pb, 4);
+ if (ff_alloc_extradata(par, 12) < 0)
+ return AVERROR(ENOMEM);
+ memset(par->extradata, 0, 12);
+
+ chunk = avio_rl32(pb);
+ if (chunk == MKTAG('c', 'o', 'm', 'p')) {
+ block_size = avio_rb16(pb);
+ avio_read(pb, par->extradata, 8);
+ avio_skip(pb, 2);
+ } else if (chunk == MKTAG('d', 'e', 'c', 0)) {
+ int count1, count2, count3, enable;
+
+ block_size = avio_rb16(pb);
+ par->extradata[0] = avio_r8(pb);
+ par->extradata[1] = avio_r8(pb);
+ count1 = avio_r8(pb);
+ count2 = avio_r8(pb);
+ count3 = avio_r8(pb);
+ enable = avio_r8(pb);
+ par->extradata[2] = FFMAX(count3 >> 4, 1);
+ par->extradata[3] = count3 & 0xf;
+ par->extradata[4] = count1 + 1;
+ par->extradata[5] = (enable ? count2 : count1) + 1;
+ par->extradata[6] = par->extradata[4] - par->extradata[5];
+ } else {
+ return AVERROR_INVALIDDATA;
+ }
+
+ if (block_size < 8) {
+ return AVERROR_INVALIDDATA;
+ }
+ par->block_align = block_size;
+ st->duration = 1024 * block_count;
+
+ while (avio_tell(pb) < s->internal->data_offset && !avio_feof(pb)) {
+ chunk = avio_rl32(pb) & 0x7f7f7f7f;
+
+ if (chunk == MKTAG('v', 'b', 'r', 0)) {
+ avio_skip(pb, 4);
+ } else if (chunk == MKTAG('a', 't', 'h', 0)) {
+ ath_type = avio_rb16(pb);
+ } else if (chunk == MKTAG('l', 'o', 'o', 'p')) {
+ avio_skip(pb, 12);
+ } else if (chunk == MKTAG('c', 'i', 'p', 'h')) {
+ par->extradata[8] = avio_r8(pb);
+ par->extradata[9] = avio_r8(pb);
+ } else if (chunk == MKTAG('r', 'v', 'a', 0)) {
+ avio_skip(pb, 4);
+ } else if (chunk == MKTAG('c', 'o', 'm', 'm')) {
+ avio_skip(pb, avio_r8(pb));
+ } else if (chunk == MKTAG('p', 'a', 'd', 0)) {
+ break;
+ }
+ }
+
+ 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)
+{
+ AVCodecContext *codec = s->streams[0]->codec;
+ int ret;
+
+ ret = av_get_packet(s->pb, pkt, codec->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,
+};
--
2.17.1
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