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Diffstat (limited to 'libavcodec/dvd_nav_parser.c')
-rw-r--r--libavcodec/dvd_nav_parser.c116
1 files changed, 116 insertions, 0 deletions
diff --git a/libavcodec/dvd_nav_parser.c b/libavcodec/dvd_nav_parser.c
new file mode 100644
index 0000000000..4b03e399f3
--- /dev/null
+++ b/libavcodec/dvd_nav_parser.c
@@ -0,0 +1,116 @@
+/*
+ * DVD navigation block parser for FFmpeg
+ * Copyright (c) 2013 The FFmpeg Project
+ *
+ * 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 "avcodec.h"
+#include "dsputil.h"
+#include "get_bits.h"
+#include "parser.h"
+
+#define PCI_SIZE 980
+#define DSI_SIZE 1018
+
+/* parser definition */
+typedef struct DVDNavParseContext {
+ uint32_t lba;
+ uint8_t buffer[PCI_SIZE+DSI_SIZE];
+ int copied;
+} DVDNavParseContext;
+
+static av_cold int dvd_nav_parse_init(AVCodecParserContext *s)
+{
+ DVDNavParseContext *pc = s->priv_data;
+
+ pc->lba = 0xFFFFFFFF;
+ pc->copied = 0;
+ return 0;
+}
+
+static int dvd_nav_parse(AVCodecParserContext *s,
+ AVCodecContext *avctx,
+ const uint8_t **poutbuf, int *poutbuf_size,
+ const uint8_t *buf, int buf_size)
+{
+ DVDNavParseContext *pc1 = s->priv_data;
+ int lastPacket = 0;
+ int valid = 0;
+
+ s->pict_type = AV_PICTURE_TYPE_NONE;
+
+ avctx->time_base.num = 1;
+ avctx->time_base.den = 90000;
+
+ if (buf && buf_size) {
+ switch(buf[0]) {
+ case 0x00:
+ if (buf_size == PCI_SIZE) {
+ /* PCI */
+ uint32_t lba = AV_RB32(&buf[0x01]);
+ uint32_t startpts = AV_RB32(&buf[0x0D]);
+ uint32_t endpts = AV_RB32(&buf[0x11]);
+
+ if (endpts > startpts) {
+ pc1->lba = lba;
+ s->pts = (int64_t)startpts;
+ s->duration = endpts - startpts;
+
+ memcpy(pc1->buffer, buf, PCI_SIZE);
+ pc1->copied = PCI_SIZE;
+ valid = 1;
+ }
+ }
+ break;
+
+ case 0x01:
+ if ((buf_size == DSI_SIZE) && (pc1->copied == PCI_SIZE)) {
+ /* DSI */
+ uint32_t lba = AV_RB32(&buf[0x05]);
+
+ if (lba == pc1->lba) {
+ memcpy(pc1->buffer + pc1->copied, buf, DSI_SIZE);
+ lastPacket = 1;
+ valid = 1;
+ }
+ }
+ break;
+ }
+ }
+
+ if (!valid || lastPacket) {
+ pc1->copied = 0;
+ pc1->lba = 0xFFFFFFFF;
+ }
+
+ if (lastPacket) {
+ *poutbuf = pc1->buffer;
+ *poutbuf_size = sizeof(pc1->buffer);
+ } else {
+ *poutbuf = NULL;
+ *poutbuf_size = 0;
+ }
+
+ return buf_size;
+}
+
+AVCodecParser ff_dvd_nav_parser = {
+ .codec_ids = { AV_CODEC_ID_DVD_NAV },
+ .priv_data_size = sizeof(DVDNavParseContext),
+ .parser_init = dvd_nav_parse_init,
+ .parser_parse = dvd_nav_parse,
+};