Rename dvbsubdec_parser.c to dvbsub_parser.c.

Originally committed as revision 8909 to svn://svn.ffmpeg.org/ffmpeg/trunk

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,
+};