oggdec: add support for Opus in Ogg demuxing

1 files changed, 142 insertions, 0 deletions

diff --git a/libavformat/oggparseopus.c b/libavformat/oggparseopus.c
new file mode 100644
index 0000000000..babd0f0fa6
--- /dev/null
+++ b/libavformat/oggparseopus.c
@@ -0,0 +1,142 @@
+/*
+ * Opus parser for Ogg
+ * Copyright (c) 2012 Nicolas George
+ *
+ * This file is part of Libav.
+ *
+ * Libav 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.
+ *
+ * Libav 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 Libav; 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;
+    unsigned pre_skip;
+    int64_t cur_dts;
+};
+
+#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;
+    uint8_t *extradata;
+
+    if (!priv) {
+        priv = os->private = av_mallocz(sizeof(*priv));
+        if (!priv)
+            return AVERROR(ENOMEM);
+    }
+    if (os->flags & OGG_FLAG_BOS) {
+        if (os->psize < OPUS_HEAD_SIZE || (AV_RL8(packet + 8) & 0xF0) != 0)
+            return AVERROR_INVALIDDATA;
+
+        st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
+        st->codec->codec_id   = AV_CODEC_ID_OPUS;
+        st->codec->channels   = AV_RL8(packet + 9);
+        priv->pre_skip        = AV_RL16(packet + 10);
+
+        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];
+    AVStream *st                 = avf->streams[idx];
+    struct oggopus_private *priv = os->private;
+    uint8_t *packet              = os->buf + os->pstart;
+    unsigned toc, toc_config, toc_count, frame_size, nb_frames = 1;
+
+    if (!os->psize)
+        return AVERROR_INVALIDDATA;
+
+    toc        = *packet;
+    toc_config = toc >> 3;
+    toc_count  = toc & 3;
+    frame_size = toc_config < 12 ? FFMAX(480, 960 * (toc_config & 3)) :
+                 toc_config < 16 ? 480 << (toc_config & 1) :
+                                   120 << (toc_config & 3);
+    if (toc_count == 3) {
+        if (os->psize < 2)
+            return AVERROR_INVALIDDATA;
+        nb_frames = packet[1] & 0x3F;
+    } else if (toc_count) {
+        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;
+        priv->cur_dts = os->lastdts = os->lastpts -= priv->pre_skip;
+    }
+
+    priv->cur_dts += os->pduration;
+    if ((os->flags & OGG_FLAG_EOS)) {
+        int64_t skip = priv->cur_dts - os->granule + priv->pre_skip;
+        skip = FFMIN(skip, os->pduration);
+        if (skip > 0) {
+            os->pduration = skip < os->pduration ? os->pduration - skip : 1;
+            av_log(avf, AV_LOG_WARNING,
+                   "Last packet is truncated to %d (because of unimplemented end trim support).\n",
+                   os->pduration);
+            return AVERROR_PATCHWELCOME;
+        }
+    }
+
+    return 0;
+}
+
+const struct ogg_codec ff_opus_codec = {
+    .name             = "Opus",
+    .magic            = "OpusHead",
+    .magicsize        = 8,
+    .header           = opus_header,
+    .packet           = opus_packet,
+    .granule_is_start = 1,
+    .nb_header        = 1,
+};