[FFmpeg-devel] [PATCH v2 2/2] avformat: add SMPTE 337M demuxer
foo86
foobaz86 at gmail.com
Sat Jul 1 17:06:27 EEST 2017
---
Changelog | 1 +
doc/general.texi | 1 +
libavformat/Makefile | 1 +
libavformat/allformats.c | 1 +
libavformat/s337m.c | 206 +++++++++++++++++++++++++++++++++++++++++++++++
libavformat/version.h | 2 +-
6 files changed, 211 insertions(+), 1 deletion(-)
create mode 100644 libavformat/s337m.c
diff --git a/Changelog b/Changelog
index a8726c6736..a909031849 100644
--- a/Changelog
+++ b/Changelog
@@ -26,6 +26,7 @@ version <next>:
--x86asmexe=yasm to configure to restore the old behavior.
- additional frame format support for Interplay MVE movies
- support for decoding through D3D11VA in ffmpeg
+- Dolby E decoder and SMPTE 337M demuxer
version 3.3:
- CrystalHD decoder moved to new decode API
diff --git a/doc/general.texi b/doc/general.texi
index d95ef31fde..036c8c25d4 100644
--- a/doc/general.texi
+++ b/doc/general.texi
@@ -520,6 +520,7 @@ library:
@tab Multimedia format used by many games.
@item SMJPEG @tab X @tab X
@tab Used in certain Loki game ports.
+ at item SMPTE 337M encapsulation @tab @tab X
@item Smush @tab @tab X
@tab Multimedia format used in some LucasArts games.
@item Sony OpenMG (OMA) @tab X @tab X
diff --git a/libavformat/Makefile b/libavformat/Makefile
index 80aeed22c0..b0ef82cdd4 100644
--- a/libavformat/Makefile
+++ b/libavformat/Makefile
@@ -432,6 +432,7 @@ OBJS-$(CONFIG_RTSP_DEMUXER) += rtsp.o rtspdec.o httpauth.o \
urldecode.o
OBJS-$(CONFIG_RTSP_MUXER) += rtsp.o rtspenc.o httpauth.o \
urldecode.o
+OBJS-$(CONFIG_S337M_DEMUXER) += s337m.o spdif.o
OBJS-$(CONFIG_SAMI_DEMUXER) += samidec.o subtitles.o
OBJS-$(CONFIG_SAP_DEMUXER) += sapdec.o
OBJS-$(CONFIG_SAP_MUXER) += sapenc.o
diff --git a/libavformat/allformats.c b/libavformat/allformats.c
index a0e2fb8c85..1ebc14231c 100644
--- a/libavformat/allformats.c
+++ b/libavformat/allformats.c
@@ -267,6 +267,7 @@ static void register_all(void)
REGISTER_MUXDEMUX(RTP, rtp);
REGISTER_MUXER (RTP_MPEGTS, rtp_mpegts);
REGISTER_MUXDEMUX(RTSP, rtsp);
+ REGISTER_DEMUXER (S337M, s337m);
REGISTER_DEMUXER (SAMI, sami);
REGISTER_MUXDEMUX(SAP, sap);
REGISTER_DEMUXER (SBG, sbg);
diff --git a/libavformat/s337m.c b/libavformat/s337m.c
new file mode 100644
index 0000000000..1f4ba5edaf
--- /dev/null
+++ b/libavformat/s337m.c
@@ -0,0 +1,206 @@
+/*
+ * Copyright (C) 2017 foo86
+ *
+ * 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 "spdif.h"
+
+#define MARKER_16LE 0x72F81F4E
+#define MARKER_20LE 0x20876FF0E154
+#define MARKER_24LE 0x72F8961F4EA5
+
+#define IS_16LE_MARKER(state) ((state & 0xFFFFFFFF) == MARKER_16LE)
+#define IS_20LE_MARKER(state) ((state & 0xF0FFFFF0FFFF) == MARKER_20LE)
+#define IS_24LE_MARKER(state) ((state & 0xFFFFFFFFFFFF) == MARKER_24LE)
+#define IS_LE_MARKER(state) (IS_16LE_MARKER(state) || IS_20LE_MARKER(state) || IS_24LE_MARKER(state))
+
+static int s337m_get_offset_and_codec(AVFormatContext *s,
+ uint64_t state,
+ int data_type, int data_size,
+ int *offset, enum AVCodecID *codec)
+{
+ int word_bits;
+
+ if (IS_16LE_MARKER(state)) {
+ word_bits = 16;
+ } else if (IS_20LE_MARKER(state)) {
+ data_type >>= 8;
+ data_size >>= 4;
+ word_bits = 20;
+ } else {
+ data_type >>= 8;
+ word_bits = 24;
+ }
+
+ if ((data_type & 0x1F) != 0x1C) {
+ if (s)
+ avpriv_report_missing_feature(s, "Data type %#x in SMPTE 337M", data_type & 0x1F);
+ return AVERROR_PATCHWELCOME;
+ }
+
+ if (codec)
+ *codec = AV_CODEC_ID_DOLBY_E;
+
+ switch (data_size / word_bits) {
+ case 3648:
+ *offset = 1920;
+ break;
+ case 3644:
+ *offset = 2002;
+ break;
+ case 3640:
+ *offset = 2000;
+ break;
+ case 3040:
+ *offset = 1601;
+ break;
+ default:
+ if (s)
+ avpriv_report_missing_feature(s, "Dolby E data size %d in SMPTE 337M", data_size);
+ return AVERROR_PATCHWELCOME;
+ }
+
+ *offset -= 4;
+ *offset *= (word_bits + 7 >> 3) * 2;
+ return 0;
+}
+
+static int s337m_probe(AVProbeData *p)
+{
+ uint64_t state = 0;
+ int markers[3] = { 0 };
+ int i, sum, max, data_type, data_size, offset;
+ uint8_t *buf;
+
+ for (buf = p->buf; buf < p->buf + p->buf_size; buf++) {
+ state = (state << 8) | *buf;
+ if (!IS_LE_MARKER(state))
+ continue;
+
+ if (IS_16LE_MARKER(state)) {
+ data_type = AV_RL16(buf + 1);
+ data_size = AV_RL16(buf + 3);
+ buf += 4;
+ } else {
+ data_type = AV_RL24(buf + 1);
+ data_size = AV_RL24(buf + 4);
+ buf += 6;
+ }
+
+ if (s337m_get_offset_and_codec(NULL, state, data_type, data_size, &offset, NULL))
+ continue;
+
+ i = IS_16LE_MARKER(state) ? 0 : IS_20LE_MARKER(state) ? 1 : 2;
+ markers[i]++;
+
+ buf += offset;
+ state = 0;
+ }
+
+ 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 && markers[max] * 4 > sum * 3)
+ return AVPROBE_SCORE_EXTENSION + 1;
+
+ return 0;
+}
+
+static int s337m_read_header(AVFormatContext *s)
+{
+ s->ctx_flags |= AVFMTCTX_NOHEADER;
+ return 0;
+}
+
+static void bswap_buf24(uint8_t *data, int size)
+{
+ int i;
+
+ for (i = 0; i < size / 3; i++, data += 3)
+ FFSWAP(uint8_t, data[0], data[2]);
+}
+
+static int s337m_read_packet(AVFormatContext *s, AVPacket *pkt)
+{
+ AVIOContext *pb = s->pb;
+ uint64_t state = 0;
+ int ret, data_type, data_size, offset;
+ enum AVCodecID codec;
+ int64_t pos;
+
+ while (!IS_LE_MARKER(state)) {
+ state = (state << 8) | avio_r8(pb);
+ if (avio_feof(pb))
+ return AVERROR_EOF;
+ }
+
+ if (IS_16LE_MARKER(state)) {
+ data_type = avio_rl16(pb);
+ data_size = avio_rl16(pb);
+ } else {
+ data_type = avio_rl24(pb);
+ data_size = avio_rl24(pb);
+ }
+
+ pos = avio_tell(pb);
+
+ if ((ret = s337m_get_offset_and_codec(s, state, data_type, data_size, &offset, &codec)) < 0)
+ return ret;
+
+ if ((ret = av_new_packet(pkt, offset)) < 0)
+ return ret;
+
+ pkt->pos = pos;
+
+ if (avio_read(pb, pkt->data, pkt->size) < pkt->size) {
+ av_packet_unref(pkt);
+ return AVERROR_EOF;
+ }
+
+ if (IS_16LE_MARKER(state))
+ ff_spdif_bswap_buf16((uint16_t *)pkt->data, (uint16_t *)pkt->data, pkt->size >> 1);
+ else
+ bswap_buf24(pkt->data, pkt->size);
+
+ if (!s->nb_streams) {
+ AVStream *st = avformat_new_stream(s, NULL);
+ if (!st) {
+ av_packet_unref(pkt);
+ return AVERROR(ENOMEM);
+ }
+ st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
+ st->codecpar->codec_id = codec;
+ }
+
+ return 0;
+}
+
+AVInputFormat ff_s337m_demuxer = {
+ .name = "s337m",
+ .long_name = NULL_IF_CONFIG_SMALL("SMPTE 337M"),
+ .read_probe = s337m_probe,
+ .read_header = s337m_read_header,
+ .read_packet = s337m_read_packet,
+ .flags = AVFMT_GENERIC_INDEX,
+};
diff --git a/libavformat/version.h b/libavformat/version.h
index 44c16ac75a..48b81f2e48 100644
--- a/libavformat/version.h
+++ b/libavformat/version.h
@@ -32,7 +32,7 @@
// Major bumping may affect Ticket5467, 5421, 5451(compatibility with Chromium)
// Also please add any ticket numbers that you believe might be affected here
#define LIBAVFORMAT_VERSION_MAJOR 57
-#define LIBAVFORMAT_VERSION_MINOR 75
+#define LIBAVFORMAT_VERSION_MINOR 76
#define LIBAVFORMAT_VERSION_MICRO 100
#define LIBAVFORMAT_VERSION_INT AV_VERSION_INT(LIBAVFORMAT_VERSION_MAJOR, \
--
2.11.0
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