[FFmpeg-devel] [PATCH] avformat: add 3dostr demuxer
Paul B Mahol
onemda at gmail.com
Wed Oct 28 09:11:28 CET 2015
Signed-off-by: Paul B Mahol <onemda at gmail.com>
---
libavformat/3dostr.c | 169 +++++++++++++++++++++++++++++++++++++++++++++++
libavformat/Makefile | 1 +
libavformat/allformats.c | 1 +
3 files changed, 171 insertions(+)
create mode 100644 libavformat/3dostr.c
diff --git a/libavformat/3dostr.c b/libavformat/3dostr.c
new file mode 100644
index 0000000..7df36b9
--- /dev/null
+++ b/libavformat/3dostr.c
@@ -0,0 +1,169 @@
+/*
+ * 3DO STR demuxer
+ * Copyright (c) 2015 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/bswap.h"
+#include "avformat.h"
+#include "internal.h"
+
+static int threedostr_probe(AVProbeData *p)
+{
+ if (memcmp(p->buf, "CTRL", 4) &&
+ memcmp(p->buf, "SHDR", 4) &&
+ memcmp(p->buf, "SNDS", 4))
+ return 0;
+
+ return AVPROBE_SCORE_MAX / 3 * 2;
+}
+
+static int threedostr_read_header(AVFormatContext *s)
+{
+ unsigned chunk, codec = 0, size, ctrl_size = -1, found_shdr = 0;
+ AVStream *st;
+
+ st = avformat_new_stream(s, NULL);
+ if (!st)
+ return AVERROR(ENOMEM);
+
+ st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
+
+ while (!avio_feof(s->pb) && !found_shdr) {
+ chunk = avio_rl32(s->pb);
+ size = avio_rb32(s->pb);
+
+ if (size < 8)
+ return AVERROR_INVALIDDATA;
+ size -= 8;
+
+ switch (chunk) {
+ case MKTAG('C','T','R','L'):
+ ctrl_size = size;
+ break;
+ case MKTAG('S','N','D','S'):
+ if (size < 56)
+ return AVERROR_INVALIDDATA;
+ avio_skip(s->pb, 8);
+ if (avio_rl32(s->pb) != MKTAG('S','H','D','R'))
+ return AVERROR_INVALIDDATA;
+ avio_skip(s->pb, 24);
+ st->codec->sample_rate = avio_rb32(s->pb);
+ st->codec->channels = avio_rb32(s->pb);
+ if (st->codec->channels <= 0)
+ return AVERROR_INVALIDDATA;
+ codec = avio_rl32(s->pb);
+ avio_skip(s->pb, 4);
+ if (ctrl_size == 20 || ctrl_size == 3 || ctrl_size == -1)
+ st->duration = (avio_rb32(s->pb) - 1) / st->codec->channels;
+ else
+ st->duration = avio_rb32(s->pb) * 16 / st->codec->channels;
+ size -= 56;
+ found_shdr = 1;
+ break;
+ case MKTAG('S','H','D','R'):
+ if (size > 0x78) {
+ avio_skip(s->pb, 0x74);
+ size -= 0x78;
+ if (avio_rl32(s->pb) == MKTAG('C','T','R','L') && size > 4) {
+ ctrl_size = avio_rb32(s->pb);
+ size -= 4;;
+ }
+ }
+ break;
+ default:
+ av_log(s, AV_LOG_DEBUG, "skipping unknown chunk: %X\n", chunk);
+ break;
+ }
+
+ avio_skip(s->pb, size);
+ }
+
+ switch (codec) {
+ case MKTAG('S','D','X','2'):
+ st->codec->codec_id = AV_CODEC_ID_SDX2_DPCM;
+ st->codec->block_align = 1 * st->codec->channels;
+ break;
+ default:
+ avpriv_request_sample(s, "codec %X", codec);
+ return AVERROR_PATCHWELCOME;
+ }
+
+ avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate);
+
+ return 0;
+}
+
+static int threedostr_read_packet(AVFormatContext *s, AVPacket *pkt)
+{
+ unsigned chunk, size, found_ssmp = 0;
+ AVStream *st = s->streams[0];
+ int64_t pos;
+ int ret = 0;
+
+ while (!found_ssmp) {
+ if (avio_feof(s->pb))
+ return AVERROR_EOF;
+
+ pos = avio_tell(s->pb);
+ chunk = avio_rl32(s->pb);
+ size = avio_rb32(s->pb);
+
+ if (!size)
+ continue;
+
+ if (size < 8)
+ return AVERROR_INVALIDDATA;
+ size -= 8;
+
+ switch (chunk) {
+ case MKTAG('S','N','D','S'):
+ if (size <= 16)
+ return AVERROR_INVALIDDATA;
+ avio_skip(s->pb, 8);
+ if (avio_rl32(s->pb) != MKTAG('S','S','M','P'))
+ return AVERROR_INVALIDDATA;
+ avio_skip(s->pb, 4);
+ size -= 16;
+ ret = av_get_packet(s->pb, pkt, size);
+ pkt->pos = pos;
+ pkt->stream_index = 0;
+ pkt->duration = size / st->codec->channels;
+ size = 0;
+ found_ssmp = 1;
+ break;
+ default:
+ av_log(s, AV_LOG_DEBUG, "skipping unknown chunk: %X\n", chunk);
+ break;
+ }
+
+ avio_skip(s->pb, size);
+ }
+
+ return ret;
+}
+
+AVInputFormat ff_threedostr_demuxer = {
+ .name = "3dostr",
+ .long_name = NULL_IF_CONFIG_SMALL("3DO STR"),
+ .read_probe = threedostr_probe,
+ .read_header = threedostr_read_header,
+ .read_packet = threedostr_read_packet,
+ .extensions = "str",
+ .flags = AVFMT_GENERIC_INDEX,
+};
diff --git a/libavformat/Makefile b/libavformat/Makefile
index 5ca2843..c3d9e18 100644
--- a/libavformat/Makefile
+++ b/libavformat/Makefile
@@ -435,6 +435,7 @@ OBJS-$(CONFIG_TAK_DEMUXER) += takdec.o apetag.o img2.o rawdec.o
OBJS-$(CONFIG_TEDCAPTIONS_DEMUXER) += tedcaptionsdec.o subtitles.o
OBJS-$(CONFIG_TEE_MUXER) += tee.o
OBJS-$(CONFIG_THP_DEMUXER) += thp.o
+OBJS-$(CONFIG_THREEDOSTR_DEMUXER) += 3dostr.o
OBJS-$(CONFIG_TIERTEXSEQ_DEMUXER) += tiertexseq.o
OBJS-$(CONFIG_MKVTIMESTAMP_V2_MUXER) += mkvtimestamp_v2.o
OBJS-$(CONFIG_TMV_DEMUXER) += tmv.o
diff --git a/libavformat/allformats.c b/libavformat/allformats.c
index 69c02b1..a67a226 100644
--- a/libavformat/allformats.c
+++ b/libavformat/allformats.c
@@ -303,6 +303,7 @@ void av_register_all(void)
REGISTER_MUXER (TG2, tg2);
REGISTER_MUXER (TGP, tgp);
REGISTER_DEMUXER (THP, thp);
+ REGISTER_DEMUXER (THREEDOSTR, threedostr);
REGISTER_DEMUXER (TIERTEXSEQ, tiertexseq);
REGISTER_MUXER (MKVTIMESTAMP_V2, mkvtimestamp_v2);
REGISTER_DEMUXER (TMV, tmv);
--
1.9.1
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