avcodec: add a cook parser to get subpacket duration

Fixes jittery video playback of rm files with cook audio.

1 files changed, 59 insertions, 0 deletions

diff --git a/libavcodec/cook_parser.c b/libavcodec/cook_parser.c
new file mode 100644
index 0000000000..c16f7c8a5f
--- /dev/null
+++ b/libavcodec/cook_parser.c
@@ -0,0 +1,59 @@
+/*
+ * Copyright (c) 2012 Justin Ruggles <justin.ruggles@gmail.com>
+ *
+ * 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
+ * Cook audio parser
+ *
+ * Determines subpacket duration from extradata.
+ */
+
+#include <stdint.h>
+
+#include "libavutil/intreadwrite.h"
+#include "parser.h"
+
+typedef struct CookParseContext {
+    int duration;
+} CookParseContext;
+
+static int cook_parse(AVCodecParserContext *s1, AVCodecContext *avctx,
+                      const uint8_t **poutbuf, int *poutbuf_size,
+                      const uint8_t *buf, int buf_size)
+{
+    CookParseContext *s = s1->priv_data;
+
+    if (s->duration)
+        s1->duration = s->duration;
+    else if (avctx->extradata && avctx->extradata_size >= 8 && avctx->channels)
+        s->duration = AV_RB16(avctx->extradata + 4) / avctx->channels;
+
+    /* always return the full packet. this parser isn't doing any splitting or
+       combining, only setting packet duration */
+    *poutbuf      = buf;
+    *poutbuf_size = buf_size;
+    return buf_size;
+}
+
+AVCodecParser ff_cook_parser = {
+    .codec_ids      = { CODEC_ID_COOK },
+    .priv_data_size = sizeof(CookParseContext),
+    .parser_parse   = cook_parse,
+};