Merge commit '9f61abc8111c7c43f49ca012e957a108b9cc7610'

This also deprecates our old duplicated callbacks.

* commit '9f61abc8111c7c43f49ca012e957a108b9cc7610':
  lavf: allow custom IO for all files

Merged-by: Derek Buitenhuis <derek.buitenhuis@gmail.com>

1 files changed, 37 insertions, 3 deletions

diff --git a/libavformat/avformat.h b/libavformat/avformat.h
index 273a6ae..34bad43 100644
--- a/libavformat/avformat.h
+++ b/libavformat/avformat.h
@@ -1780,7 +1780,6 @@ typedef struct AVFormatContext {
     /**
      * User data.
      * This is a place for some private data of the user.
-     * Mostly usable with control_message_cb or any future callbacks in device's context.
      */
     void *opaque;
 
@@ -1811,6 +1810,7 @@ typedef struct AVFormatContext {
      */
     enum AVCodecID data_codec_id;
 
+#if FF_API_OLD_OPEN_CALLBACKS
     /**
      * Called to open further IO contexts when needed for demuxing.
      *
@@ -1825,8 +1825,12 @@ typedef struct AVFormatContext {
      * @See av_format_set_open_cb()
      *
      * Demuxing: Set by user.
+     *
+     * @deprecated Use io_open and io_close.
      */
+    attribute_deprecated
     int (*open_cb)(struct AVFormatContext *s, AVIOContext **p, const char *url, int flags, const AVIOInterruptCB *int_cb, AVDictionary **options);
+#endif
 
     /**
      * ',' separated list of allowed protocols.
@@ -1834,6 +1838,34 @@ typedef struct AVFormatContext {
      * - decoding: set by user through AVOptions (NO direct access)
      */
     char *protocol_whitelist;
+
+    /*
+     * A callback for opening new IO streams.
+     *
+     * Certain muxers or demuxers (e.g. for various playlist-based formats) need
+     * to open additional files during muxing or demuxing. This callback allows
+     * the caller to provide custom IO in such cases.
+     *
+     * @param s the format context
+     * @param pb on success, the newly opened IO context should be returned here
+     * @param url the url to open
+     * @param flags a combination of AVIO_FLAG_*
+     * @param options a dictionary of additional options, with the same
+     *                semantics as in avio_open2()
+     * @return 0 on success, a negative AVERROR code on failure
+     *
+     * @note Certain muxers and demuxers do nesting, i.e. they open one or more
+     * additional internal format contexts. Thus the AVFormatContext pointer
+     * passed to this callback may be different from the one facing the caller.
+     * It will, however, have the same 'opaque' field.
+     */
+    int (*io_open)(struct AVFormatContext *s, AVIOContext **pb, const char *url,
+                   int flags, AVDictionary **options);
+
+    /**
+     * A callback for closing the streams opened with AVFormatContext.io_open().
+     */
+    void (*io_close)(struct AVFormatContext *s, AVIOContext *pb);
 } AVFormatContext;
 
 int av_format_get_probe_score(const AVFormatContext *s);
@@ -1851,8 +1883,10 @@ void *    av_format_get_opaque(const AVFormatContext *s);
 void      av_format_set_opaque(AVFormatContext *s, void *opaque);
 av_format_control_message av_format_get_control_message_cb(const AVFormatContext *s);
 void      av_format_set_control_message_cb(AVFormatContext *s, av_format_control_message callback);
-AVOpenCallback av_format_get_open_cb(const AVFormatContext *s);
-void      av_format_set_open_cb(AVFormatContext *s, AVOpenCallback callback);
+#if FF_API_OLD_OPEN_CALLBACKS
+attribute_deprecated AVOpenCallback av_format_get_open_cb(const AVFormatContext *s);
+attribute_deprecated void av_format_set_open_cb(AVFormatContext *s, AVOpenCallback callback);
+#endif
 
 /**
  * This function will cause global side data to be injected in the next packet