Add ff_sauce_read()

Originally committed as revision 24300 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavformat/sauce.c

@@ -0,0 +1,99 @@
+/*
+ * @file
+ * SAUCE header parser
+ * Copyright (c) 2010 Peter Ross <pross@xvid.org>
+ *
+ * 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 "libavutil/intreadwrite.h"
+#include "avformat.h"
+#include "sauce.h"
+
+int ff_sauce_read(AVFormatContext *avctx, uint64_t *fsize, int *got_width, int get_height)
+{
+    ByteIOContext *pb = avctx->pb;
+    char buf[36];
+    int datatype, filetype, t1, t2, nb_comments, flags;
+    uint64_t start_pos = url_fsize(pb) - 128;
+
+    url_fseek(pb, start_pos, SEEK_SET);
+    if (get_buffer(pb, buf, 7) != 7)
+        return -1;
+    if (memcmp(buf, "SAUCE00", 7))
+        return -1;
+
+#define GET_SAUCE_META(name,size) \
+    if (get_buffer(pb, buf, size) == size && buf[0]) { \
+        buf[size] = 0; \
+        av_metadata_set2(&avctx->metadata, name, buf, 0); \
+    }
+
+    GET_SAUCE_META("title",     35)
+    GET_SAUCE_META("artist",    20)
+    GET_SAUCE_META("publisher", 20)
+    GET_SAUCE_META("date",      8)
+    url_fskip(pb, 4);
+    datatype    = get_byte(pb);
+    filetype    = get_byte(pb);
+    t1          = get_le16(pb);
+    t2          = get_le16(pb);
+    nb_comments = get_byte(pb);
+    flags       = get_byte(pb);
+    url_fskip(pb, 4);
+    GET_SAUCE_META("encoder",   22);
+
+    if (got_width && datatype && filetype) {
+        if ((datatype == 1 && filetype <=2) || (datatype == 5 && filetype == 255) || datatype == 6) {
+            if (t1) {
+                avctx->streams[0]->codec->width = t1<<3;
+                *got_width = 1;
+            }
+            if (get_height && t2)
+                avctx->streams[0]->codec->height = t2<<4;
+        } else if (datatype == 5) {
+            if (filetype > 1) {
+                avctx->streams[0]->codec->width = (filetype == 1 ? t1 : filetype) << 4;
+                *got_width = 1;
+            }
+            if (get_height && t2)
+                avctx->streams[0]->codec->height = t2<<4;
+        }
+    }
+
+    *fsize -= 128;
+
+    if (nb_comments > 0) {
+        url_fseek(pb, start_pos - 64*nb_comments - 5, SEEK_SET);
+        if (get_buffer(pb, buf, 5) == 5 && !memcmp(buf, "COMNT", 5)) {
+            int i;
+            char *str = av_malloc(65*nb_comments + 1);
+            *fsize -= 64*nb_comments + 5;
+            if (!str)
+                return 0;
+            for (i = 0; i < nb_comments; i++) {
+                if (get_buffer(pb, str + 65*i, 64) != 64)
+                    break;
+                str[65*i + 64] = '\n';
+            }
+            str[65*i] = 0;
+            av_metadata_set2(&avctx->metadata, "comment", str, AV_METADATA_DONT_STRDUP_VAL);
+        }
+    }
+
+    return 0;
+}

libavformat/sauce.h

@@ -0,0 +1,37 @@
+/*
+ * @file
+ * SAUCE header parser
+ * Copyright (c) 2010 Peter Ross <pross@xvid.org>
+ *
+ * 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
+ */
+
+#ifndef AVFORMAT_SAUCE_H
+#define AVFORMAT_SAUCE_H
+
+#include "avformat.h"
+
+/**
+ * @param avctx AVFormatContext
+ * @param fsize[out] return length of file, less SAUCE header
+ * @param got_width[out] set to non-zero if SAUCE header reported height
+ * @param get_height Tell SAUCE header to parse height
+ */
+int ff_sauce_read(AVFormatContext *avctx, uint64_t *fsize, int *got_width, int get_height);
+
+#endif /* AVFORMAT_SAUCE_H */
+