avcodec: add dvaudio parser

Signed-off-by: Paul B Mahol <onemda@gmail.com>

1 files changed, 46 insertions, 0 deletions

diff --git a/libavcodec/dvaudio_parser.c b/libavcodec/dvaudio_parser.c
new file mode 100644
index 0000000000..160faafdb7
--- /dev/null
+++ b/libavcodec/dvaudio_parser.c
@@ -0,0 +1,46 @@
+/*
+ * 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
+ */
+
+/**
+ * @file
+ * Ulead DV audio parser
+ *
+ * Determines the duration for each packet.
+ */
+
+#include "parser.h"
+#include "dvaudio.h"
+
+static int dvaudio_parse(AVCodecParserContext *s1, AVCodecContext *avctx,
+                        const uint8_t **poutbuf, int *poutbuf_size,
+                        const uint8_t *buf, int buf_size)
+{
+    if (buf_size >= 248)
+        s1->duration = dv_get_audio_sample_count(buf + 244, avctx->block_align == 8640);
+
+    /* always return the full packet. this parser isn't doing any splitting or
+       combining, only packet analysis */
+    *poutbuf      = buf;
+    *poutbuf_size = buf_size;
+    return buf_size;
+}
+
+AVCodecParser ff_dvaudio_parser = {
+    .codec_ids      = { AV_CODEC_ID_DVAUDIO },
+    .parser_parse   = dvaudio_parse,
+};