Introduce max_picture_buffer variable in AVFormatContext,

set by rtbufsize option.

Originally committed as revision 12383 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavformat/avformat.h

@@ -22,7 +22,7 @@
 #define FFMPEG_AVFORMAT_H
 
 #define LIBAVFORMAT_VERSION_MAJOR 52
-#define LIBAVFORMAT_VERSION_MINOR  8
+#define LIBAVFORMAT_VERSION_MINOR  9
 #define LIBAVFORMAT_VERSION_MICRO  0
 
 #define LIBAVFORMAT_VERSION_INT AV_VERSION_INT(LIBAVFORMAT_VERSION_MAJOR, \
@@ -508,6 +508,12 @@ typedef struct AVFormatContext {
      * demuxing: set by user
      */
     unsigned int max_index_size;
+
+    /**
+     * Maximum ammount of memory in bytes to use for buffering frames that are
+     * obtained from real-time capture devices.
+     */
+    unsigned int max_picture_buffer;
 } AVFormatContext;
 
 typedef struct AVPacketList {

libavformat/utils.c

@@ -324,6 +324,7 @@ static const AVOption options[]={
 {"analyzeduration", "how many microseconds are analyzed to estimate duration", OFFSET(max_analyze_duration), FF_OPT_TYPE_INT, 3*AV_TIME_BASE, 0, INT_MAX, D},
 {"cryptokey", "decryption key", OFFSET(key), FF_OPT_TYPE_BINARY, 0, 0, 0, D},
 {"indexmem", "max memory used for timestamp index (per stream)", OFFSET(max_index_size), FF_OPT_TYPE_INT, 1<<20, 0, INT_MAX, D},
+{"rtbufsize", "max memory used for buffering real-time frames", OFFSET(max_picture_buffer), FF_OPT_TYPE_INT, 3041280, 0, INT_MAX, D}, /* defaults to 1s of 15fps 352x288 YUYV422 video */
 {NULL},
 };