Add a second metadata compatibility layer, so that metadata that gets

demuxed with new API is automatically converted to the old API,
allowing old applications to stay functional.

Originally committed as revision 16499 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavformat/Makefile

@@ -5,7 +5,7 @@ FFLIBS = avcodec avutil
 
 HEADERS = avformat.h avio.h rtsp.h rtspcodes.h
 
-OBJS = allformats.o cutils.o metadata.o os_support.o sdp.o utils.o
+OBJS = allformats.o cutils.o metadata.o metadata_compat.o os_support.o sdp.o utils.o
 
 # muxers/demuxers
 OBJS-$(CONFIG_AAC_DEMUXER)               += raw.o

libavformat/metadata.h

@@ -36,6 +36,7 @@ struct AVMetadata{
 };
 
 #if LIBAVFORMAT_VERSION_MAJOR < 53
+void ff_metadata_demux_compat(AVFormatContext *s);
 void ff_metadata_sync_compat(AVFormatContext *s);
 #endif
 

libavformat/metadata_compat.c

+/*
+ * Copyright (c) 2009  Aurelien Jacobs <aurel@gnuage.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
+ */
+
+#if LIBAVFORMAT_VERSION_MAJOR < 53
+
+#include <strings.h>
+#include "metadata.h"
+#include "libavutil/avstring.h"
+
+#define SIZE_OFFSET(x) sizeof(((AVFormatContext*)0)->x),offsetof(AVFormatContext,x)
+
+static const struct {
+    const char name[16];
+    int   size;
+    int   offset;
+} compat_tab[] = {
+    { "title",           SIZE_OFFSET(title)     },
+    { "author",          SIZE_OFFSET(author)    },
+    { "copyright",       SIZE_OFFSET(copyright) },
+    { "comment",         SIZE_OFFSET(comment)   },
+    { "album",           SIZE_OFFSET(album)     },
+    { "year",            SIZE_OFFSET(year)      },
+    { "track",           SIZE_OFFSET(track)     },
+    { "genre",           SIZE_OFFSET(genre)     },
+
+    { "artist",          SIZE_OFFSET(author)    },
+    { "creator",         SIZE_OFFSET(author)    },
+    { "written_by",      SIZE_OFFSET(author)    },
+    { "lead_performer",  SIZE_OFFSET(author)    },
+    { "description",     SIZE_OFFSET(comment)   },
+    { "albumtitle",      SIZE_OFFSET(album)     },
+    { "date_written",    SIZE_OFFSET(year)      },
+    { "date_released",   SIZE_OFFSET(year)      },
+    { "tracknumber",     SIZE_OFFSET(track)     },
+    { "part_number",     SIZE_OFFSET(track)     },
+};
+
+void ff_metadata_demux_compat(AVFormatContext *ctx)
+{
+    AVMetadata *m;
+    int i, j;
+
+    if ((m = ctx->metadata))
+        for (j=0; j<m->count; j++)
+            for (i=0; i<FF_ARRAY_ELEMS(compat_tab); i++)
+                if (!strcasecmp(m->elems[j].key, compat_tab[i].name)) {
+                    int *ptr = (int *)((char *)ctx+compat_tab[i].offset);
+                    if (*ptr)  continue;
+                    if (compat_tab[i].size > sizeof(int))
+                        av_strlcpy((char *)ptr, m->elems[j].value, compat_tab[i].size);
+                    else
+                        *ptr = atoi(m->elems[j].value);
+                }
+
+    for (i=0; i<ctx->nb_chapters; i++)
+        if ((m = ctx->chapters[i]->metadata))
+            for (j=0; j<m->count; j++)
+                if (!strcasecmp(m->elems[j].key, "title")) {
+                    av_free(ctx->chapters[i]->title);
+                    ctx->chapters[i]->title = av_strdup(m->elems[j].value);
+                }
+
+    for (i=0; i<ctx->nb_programs; i++)
+        if ((m = ctx->programs[i]->metadata))
+            for (j=0; j<m->count; j++) {
+                if (!strcasecmp(m->elems[j].key, "name")) {
+                    av_free(ctx->programs[i]->name);
+                    ctx->programs[i]->name = av_strdup(m->elems[j].value);
+                }
+                if (!strcasecmp(m->elems[j].key, "provider_name")) {
+                    av_free(ctx->programs[i]->provider_name);
+                    ctx->programs[i]->provider_name = av_strdup(m->elems[j].value);
+                }
+            }
+
+    for (i=0; i<ctx->nb_streams; i++)
+        if ((m = ctx->streams[i]->metadata))
+            for (j=0; j<m->count; j++) {
+                if (!strcasecmp(m->elems[j].key, "language"))
+                    av_strlcpy(ctx->streams[i]->language, m->elems[j].value, 4);
+                if (!strcasecmp(m->elems[j].key, "filename")) {
+                    av_free(ctx->streams[i]->filename);
+                    ctx->streams[i]->filename= av_strdup(m->elems[j].value);
+                }
+            }
+}
+
+#endif /* LIBAVFORMAT_VERSION_MAJOR < 53 */

libavformat/utils.c

@@ -485,6 +485,10 @@ int av_open_input_stream(AVFormatContext **ic_ptr,
     if (pb && !ic->data_offset)
         ic->data_offset = url_ftell(ic->pb);
 
+#if LIBAVFORMAT_VERSION_MAJOR < 53
+    ff_metadata_demux_compat(ic);
+#endif
+
     *ic_ptr = ic;
     return 0;
  fail: