lavc: add a native Opus decoder.

Initial implementation by Andrew D'Addesio <modchipv12@gmail.com> during
GSoC 2012.

Completion by Anton Khirnov <anton@khirnov.net>, sponsored by the
Mozilla Corporation.

Further contributions by:
Christophe Gisquet <christophe.gisquet@gmail.com>
Janne Grunau <janne-libav@jannau.net>
Luca Barbato <lu_zero@gentoo.org>

1 files changed, 75 insertions, 0 deletions

diff --git a/libavcodec/opus_parser.c b/libavcodec/opus_parser.c
new file mode 100644
index 0000000000..8a2bc22043
--- /dev/null
+++ b/libavcodec/opus_parser.c
@@ -0,0 +1,75 @@
+/*
+ * Copyright (c) 2013-2014 Mozilla Corporation
+ *
+ * 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
+ */
+
+/**
+ * @file
+ * Opus parser
+ *
+ * Determines the duration for each packet.
+ */
+
+#include "avcodec.h"
+#include "opus.h"
+
+typedef struct OpusParseContext {
+    OpusContext ctx;
+    OpusPacket pkt;
+    int extradata_parsed;
+} OpusParseContext;
+
+static int opus_parse(AVCodecParserContext *ctx, AVCodecContext *avctx,
+                      const uint8_t **poutbuf, int *poutbuf_size,
+                      const uint8_t *buf, int buf_size)
+{
+    OpusParseContext *s = ctx->priv_data;
+    int ret;
+
+    if (!buf_size)
+        return 0;
+
+    if (avctx->extradata && !s->extradata_parsed) {
+        ret = ff_opus_parse_extradata(avctx, &s->ctx);
+        if (ret < 0) {
+            av_log(avctx, AV_LOG_ERROR, "Error parsing Ogg extradata.\n");
+            goto fail;
+        }
+        av_freep(&s->ctx.channel_maps);
+        s->extradata_parsed = 1;
+    }
+
+    ret = ff_opus_parse_packet(&s->pkt, buf, buf_size, s->ctx.nb_streams > 1);
+    if (ret < 0) {
+        av_log(avctx, AV_LOG_ERROR, "Error parsing Opus packet header.\n");
+        goto fail;
+    }
+
+    ctx->duration = s->pkt.frame_count * s->pkt.frame_duration;
+
+fail:
+    *poutbuf = buf;
+    *poutbuf_size = buf_size;
+    return buf_size;
+}
+
+AVCodecParser ff_opus_parser = {
+    .codec_ids      = { AV_CODEC_ID_OPUS },
+    .priv_data_size = sizeof(OpusParseContext),
+    .parser_parse   = opus_parse,
+};