[FFmpeg-devel] [PATCH 1/3] oggdec: add support for Opus codec.
Nicolas George
nicolas.george at normalesup.org
Wed Jul 4 16:43:48 CEST 2012
This patch also introduces CODEC_ID_OPUS.
Signed-off-by: Nicolas George <nicolas.george at normalesup.org>
---
libavcodec/avcodec.h | 1 +
libavformat/Makefile | 1 +
libavformat/oggdec.c | 1 +
libavformat/oggdec.h | 1 +
libavformat/oggparseopus.c | 121 ++++++++++++++++++++++++++++++++++++++++++++
5 files changed, 125 insertions(+)
create mode 100644 libavformat/oggparseopus.c
Changes since previous version:
codec->extradata now holds the whole OpusHead packet, as mandated by the
MatroskaOpus draft.
codec->sample_rate is set to 48000 unconditionnally.
diff --git a/libavcodec/avcodec.h b/libavcodec/avcodec.h
index 9748ba6..71e9e9e 100644
--- a/libavcodec/avcodec.h
+++ b/libavcodec/avcodec.h
@@ -416,6 +416,7 @@ enum CodecID {
CODEC_ID_8SVX_RAW = MKBETAG('8','S','V','X'),
CODEC_ID_SONIC = MKBETAG('S','O','N','C'),
CODEC_ID_SONIC_LS = MKBETAG('S','O','N','L'),
+ CODEC_ID_OPUS = MKBETAG('O','P','U','S'),
/* subtitle codecs */
CODEC_ID_FIRST_SUBTITLE = 0x17000, ///< A dummy ID pointing at the start of subtitle codecs.
diff --git a/libavformat/Makefile b/libavformat/Makefile
index 9eaf28a..69eec0c 100644
--- a/libavformat/Makefile
+++ b/libavformat/Makefile
@@ -200,6 +200,7 @@ OBJS-$(CONFIG_OGG_DEMUXER) += oggdec.o \
oggparsedirac.o \
oggparseflac.o \
oggparseogm.o \
+ oggparseopus.o \
oggparseskeleton.o \
oggparsespeex.o \
oggparsetheora.o \
diff --git a/libavformat/oggdec.c b/libavformat/oggdec.c
index d30c17c..b2d734a 100644
--- a/libavformat/oggdec.c
+++ b/libavformat/oggdec.c
@@ -46,6 +46,7 @@ static const struct ogg_codec * const ogg_codecs[] = {
&ff_theora_codec,
&ff_flac_codec,
&ff_celt_codec,
+ &ff_opus_codec,
&ff_old_dirac_codec,
&ff_old_flac_codec,
&ff_ogm_video_codec,
diff --git a/libavformat/oggdec.h b/libavformat/oggdec.h
index 7f5452f..aa94db5 100644
--- a/libavformat/oggdec.h
+++ b/libavformat/oggdec.h
@@ -108,6 +108,7 @@ extern const struct ogg_codec ff_ogm_text_codec;
extern const struct ogg_codec ff_ogm_video_codec;
extern const struct ogg_codec ff_old_dirac_codec;
extern const struct ogg_codec ff_old_flac_codec;
+extern const struct ogg_codec ff_opus_codec;
extern const struct ogg_codec ff_skeleton_codec;
extern const struct ogg_codec ff_speex_codec;
extern const struct ogg_codec ff_theora_codec;
diff --git a/libavformat/oggparseopus.c b/libavformat/oggparseopus.c
new file mode 100644
index 0000000..861bddd
--- /dev/null
+++ b/libavformat/oggparseopus.c
@@ -0,0 +1,121 @@
+/*
+ * Opus parser for Ogg
+ * Copyright (c) 2012 Nicolas George
+ *
+ * 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 <string.h>
+
+#include "libavutil/intreadwrite.h"
+#include "avformat.h"
+#include "internal.h"
+#include "oggdec.h"
+
+struct oggopus_private {
+ int need_comments;
+};
+
+#define OPUS_HEAD_SIZE 19
+
+static int opus_header(AVFormatContext *avf, int idx)
+{
+ struct ogg *ogg = avf->priv_data;
+ struct ogg_stream *os = &ogg->streams[idx];
+ AVStream *st = avf->streams[idx];
+ struct oggopus_private *priv = os->private;
+ uint8_t *packet = os->buf + os->pstart;
+
+ if (!priv) {
+ priv = os->private = av_mallocz(sizeof(struct oggopus_private));
+ if (!priv)
+ return AVERROR(ENOMEM);
+ }
+ if (os->flags & OGG_FLAG_BOS) {
+ if (os->psize < OPUS_HEAD_SIZE || AV_RL8(packet + 8) != 1)
+ return AVERROR_INVALIDDATA;
+ st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
+ st->codec->codec_id = CODEC_ID_OPUS;
+ st->codec->channels = AV_RL8 (packet + 9);
+ /*pre_skip = AV_RL16(packet + 10);*/
+ /*orig_sample_rate = AV_RL32(packet + 12);*/
+ /*gain = AV_RL16(packet + 16);*/
+ /*channel_map = AV_RL8 (packet + 18);*/
+ if (os->psize > OPUS_HEAD_SIZE) {
+ uint8_t *extradata = av_malloc(os->psize +
+ FF_INPUT_BUFFER_PADDING_SIZE);
+ if (!extradata)
+ return AVERROR(ENOMEM);
+ memcpy(extradata, packet, os->psize);
+ st->codec->extradata = extradata;
+ st->codec->extradata_size = os->psize;
+ }
+
+ st->codec->sample_rate = 48000;
+ avpriv_set_pts_info(st, 64, 1, 48000);
+ priv->need_comments = 1;
+ return 1;
+ }
+
+ if (priv->need_comments) {
+ if (os->psize < 8 || memcmp(packet, "OpusTags", 8))
+ return AVERROR_INVALIDDATA;
+ ff_vorbis_comment(avf, &st->metadata, packet + 8, os->psize - 8);
+ priv->need_comments--;
+ return 1;
+ }
+ return 0;
+}
+
+static int opus_packet(AVFormatContext *avf, int idx)
+{
+ struct ogg *ogg = avf->priv_data;
+ struct ogg_stream *os = &ogg->streams[idx];
+ uint8_t *packet = os->buf + os->pstart;
+ unsigned toc, toc_config, frame_size, nb_frames = 1;
+
+ if (!os->psize)
+ return AVERROR_INVALIDDATA;
+ toc = *packet;
+ toc_config = toc >> 2;
+ frame_size = toc_config < 12 ? FFMAX(480, 960 * (toc_config & 3)) :
+ toc_config < 16 ? 480 << (toc_config & 1) :
+ 120 << (toc_config & 3);
+ if ((toc & 3) == 3) {
+ if (os->psize < 2)
+ return AVERROR_INVALIDDATA;
+ nb_frames = packet[1] & 0x3F;
+ } else if ((toc & 3)) {
+ nb_frames = 2;
+ }
+ os->pduration = frame_size * nb_frames;
+ /*if (os->lastpts != AV_NOPTS_VALUE) {
+ if (st->start_time == AV_NOPTS_VALUE)
+ st->start_time = os->lastpts;
+ os->lastdts = os->lastpts -= st->codec->skip_data;
+ }*/
+ return 0;
+}
+
+const struct ogg_codec ff_opus_codec = {
+ .name = "Opus",
+ .magic = "OpusHead",
+ .magicsize = 8,
+ .header = opus_header,
+ .packet = opus_packet,
+};
+
--
1.7.10
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