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authorDiego Biurrun <diego@biurrun.de>2007-05-06 08:41:24 +0000
committerDiego Biurrun <diego@biurrun.de>2007-05-06 08:41:24 +0000
commit027f43f095c923843270da022f020737ab49511b (patch)
treec6fba4065afcaa0e1cf0f3e4392f7d6aea0bdeae /libavcodec/dvbsub_parser.c
parentcd66ddb6b00a9f7eae2e414cc54d9e9ab39dba6e (diff)
downloadffmpeg-027f43f095c923843270da022f020737ab49511b.tar.gz
Rename dvbsubdec_parser.c to dvbsub_parser.c.
Originally committed as revision 8909 to svn://svn.ffmpeg.org/ffmpeg/trunk
Diffstat (limited to 'libavcodec/dvbsub_parser.c')
-rw-r--r--libavcodec/dvbsub_parser.c196
1 files changed, 196 insertions, 0 deletions
diff --git a/libavcodec/dvbsub_parser.c b/libavcodec/dvbsub_parser.c
new file mode 100644
index 0000000000..a327a4ba1d
--- /dev/null
+++ b/libavcodec/dvbsub_parser.c
@@ -0,0 +1,196 @@
+/*
+ * DVB subtitle parser for FFmpeg
+ * Copyright (c) 2005 Ian Caulfield.
+ *
+ * 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 "bitstream.h"
+
+//#define DEBUG
+//#define DEBUG_PACKET_CONTENTS
+
+/* Parser (mostly) copied from dvdsub.c */
+
+#define PARSE_BUF_SIZE (65536)
+
+
+/* parser definition */
+typedef struct DVBSubParseContext {
+ uint8_t *packet_buf;
+ int packet_start;
+ int packet_index;
+ int in_packet;
+} DVBSubParseContext;
+
+static int dvbsub_parse_init(AVCodecParserContext *s)
+{
+ DVBSubParseContext *pc = s->priv_data;
+ pc->packet_buf = av_malloc(PARSE_BUF_SIZE);
+
+ return 0;
+}
+
+static int dvbsub_parse(AVCodecParserContext *s,
+ AVCodecContext *avctx,
+ uint8_t **poutbuf, int *poutbuf_size,
+ const uint8_t *buf, int buf_size)
+{
+ DVBSubParseContext *pc = s->priv_data;
+ uint8_t *p, *p_end;
+ int len, buf_pos = 0;
+
+#ifdef DEBUG
+ av_log(avctx, AV_LOG_INFO, "DVB parse packet pts=%"PRIx64", lpts=%"PRIx64", cpts=%"PRIx64":\n",
+ s->pts, s->last_pts, s->cur_frame_pts[s->cur_frame_start_index]);
+#endif
+
+#ifdef DEBUG_PACKET_CONTENTS
+ int i;
+
+ for (i=0; i < buf_size; i++)
+ {
+ av_log(avctx, AV_LOG_INFO, "%02x ", buf[i]);
+ if (i % 16 == 15)
+ av_log(avctx, AV_LOG_INFO, "\n");
+ }
+
+ if (i % 16 != 0)
+ av_log(avctx, AV_LOG_INFO, "\n");
+
+#endif
+
+ *poutbuf = NULL;
+ *poutbuf_size = 0;
+
+ s->fetch_timestamp = 1;
+
+ if (s->last_pts != s->pts && s->last_pts != AV_NOPTS_VALUE) /* Start of a new packet */
+ {
+ if (pc->packet_index != pc->packet_start)
+ {
+#ifdef DEBUG
+ av_log(avctx, AV_LOG_INFO, "Discarding %d bytes\n",
+ pc->packet_index - pc->packet_start);
+#endif
+ }
+
+ pc->packet_start = 0;
+ pc->packet_index = 0;
+
+ if (buf_size < 2 || buf[0] != 0x20 || buf[1] != 0x00) {
+#ifdef DEBUG
+ av_log(avctx, AV_LOG_INFO, "Bad packet header\n");
+#endif
+ return -1;
+ }
+
+ buf_pos = 2;
+
+ pc->in_packet = 1;
+ } else {
+ if (pc->packet_start != 0)
+ {
+ if (pc->packet_index != pc->packet_start)
+ {
+ memmove(pc->packet_buf, pc->packet_buf + pc->packet_start,
+ pc->packet_index - pc->packet_start);
+
+ pc->packet_index -= pc->packet_start;
+ pc->packet_start = 0;
+ } else {
+ pc->packet_start = 0;
+ pc->packet_index = 0;
+ }
+ }
+ }
+
+ if (buf_size - buf_pos + pc->packet_index > PARSE_BUF_SIZE)
+ return -1;
+
+/* if not currently in a packet, discard data */
+ if (pc->in_packet == 0)
+ return buf_size;
+
+ memcpy(pc->packet_buf + pc->packet_index, buf + buf_pos, buf_size - buf_pos);
+ pc->packet_index += buf_size - buf_pos;
+
+ p = pc->packet_buf;
+ p_end = pc->packet_buf + pc->packet_index;
+
+ while (p < p_end)
+ {
+ if (*p == 0x0f)
+ {
+ if (p + 6 <= p_end)
+ {
+ len = AV_RB16(p + 4);
+
+ if (p + len + 6 <= p_end)
+ {
+ *poutbuf_size += len + 6;
+
+ p += len + 6;
+ } else
+ break;
+ } else
+ break;
+ } else if (*p == 0xff) {
+ if (p + 1 < p_end)
+ {
+#ifdef DEBUG
+ av_log(avctx, AV_LOG_INFO, "Junk at end of packet\n");
+#endif
+ }
+ pc->packet_index = p - pc->packet_buf;
+ pc->in_packet = 0;
+ break;
+ } else {
+ av_log(avctx, AV_LOG_ERROR, "Junk in packet\n");
+
+ pc->packet_index = p - pc->packet_buf;
+ pc->in_packet = 0;
+ break;
+ }
+ }
+
+ if (*poutbuf_size > 0)
+ {
+ *poutbuf = pc->packet_buf;
+ pc->packet_start = *poutbuf_size;
+ }
+
+ if (s->last_pts == AV_NOPTS_VALUE)
+ s->last_pts = s->pts;
+
+ return buf_size;
+}
+
+static void dvbsub_parse_close(AVCodecParserContext *s)
+{
+ DVBSubParseContext *pc = s->priv_data;
+ av_freep(&pc->packet_buf);
+}
+
+AVCodecParser dvbsub_parser = {
+ { CODEC_ID_DVB_SUBTITLE },
+ sizeof(DVBSubParseContext),
+ dvbsub_parse_init,
+ dvbsub_parse,
+ dvbsub_parse_close,
+};