[vlc-devel] [PATCH 11/11] demux/mkv: Reimplemented MkvTree and moved it to Util.hpp
Filip Roséen
filip at videolabs.io
Wed Mar 2 18:04:52 CET 2016
`MkvTree` can be used all across the module, meaning that it better
belongs in `Util.hpp` than with static linkage in `matroska_segment_parse.cpp`.
- A helper function `MkvTree_va` has been introduced so that one can
easily call the function from functions that accepts a variadic
number of arguments (using va_list).
- The implementation has been optimized so that we do not need to
allocate storage for the format string on every invocation if it
would fit inside a fixed length buffer.
- An error check has been added to signal if we run out of memory.
---
modules/demux/mkv/matroska_segment_parse.cpp | 25 -----------------
modules/demux/mkv/mkv.cpp | 1 -
modules/demux/mkv/util.cpp | 42 ++++++++++++++++++++++++++++
modules/demux/mkv/util.hpp | 4 +++
4 files changed, 46 insertions(+), 26 deletions(-)
diff --git a/modules/demux/mkv/matroska_segment_parse.cpp b/modules/demux/mkv/matroska_segment_parse.cpp
index be1d967..bb590b5 100644
--- a/modules/demux/mkv/matroska_segment_parse.cpp
+++ b/modules/demux/mkv/matroska_segment_parse.cpp
@@ -187,31 +187,6 @@ void matroska_segment_c::ParseSeekHead( KaxSeekHead *seekhead )
}
}
-
-/**
- * Helper function to print the mkv parse tree
- */
-static void MkvTree( demux_t & demuxer, int i_level, const char *psz_format, ... )
-{
- va_list args;
- if( i_level > 9 )
- {
- msg_Err( &demuxer, "MKV tree is too deep" );
- return;
- }
- va_start( args, psz_format );
- static const char psz_foo[] = "| | | | | | | | | |";
- char *psz_foo2 = (char*)malloc( i_level * 4 + 3 + strlen( psz_format ) );
- strncpy( psz_foo2, psz_foo, 4 * i_level );
- psz_foo2[ 4 * i_level ] = '+';
- psz_foo2[ 4 * i_level + 1 ] = ' ';
- strcpy( &psz_foo2[ 4 * i_level + 2 ], psz_format );
- msg_GenericVa( &demuxer,VLC_MSG_DBG, psz_foo2, args );
- free( psz_foo2 );
- va_end( args );
-}
-
-
/*****************************************************************************
* ParseTrackEntry:
*****************************************************************************/
diff --git a/modules/demux/mkv/mkv.cpp b/modules/demux/mkv/mkv.cpp
index bb55ad7..0459176 100644
--- a/modules/demux/mkv/mkv.cpp
+++ b/modules/demux/mkv/mkv.cpp
@@ -794,4 +794,3 @@ static int Demux( demux_t *p_demux)
return i_return;
}
-
diff --git a/modules/demux/mkv/util.cpp b/modules/demux/mkv/util.cpp
index acb2d29..96ba128 100644
--- a/modules/demux/mkv/util.cpp
+++ b/modules/demux/mkv/util.cpp
@@ -415,3 +415,45 @@ block_t * packetize_wavpack( mkv_track_t * p_tk, uint8_t * buffer, size_t size)
return p_block;
}
+
+void MkvTree_va( demux_t& demuxer, int i_level, const char* fmt, va_list args)
+{
+ static char const * indent = "| ";
+ static char const * prefix = "+ ";
+ static int const indent_len = strlen( indent );
+ static int const prefix_len = strlen( prefix );
+
+ char fixed_buffer[256] = {};
+ size_t const static_len = sizeof( fixed_buffer );
+ char * buffer = fixed_buffer;
+ size_t total_len = indent_len * i_level + prefix_len + strlen( fmt );
+
+ if( total_len >= static_len ) {
+ buffer = new (std::nothrow) char[total_len] ();
+
+ if (buffer == NULL) {
+ msg_Err (&demuxer, "Unable to allocate memory for format string");
+ return;
+ }
+ }
+
+ char * dst = buffer;
+
+ for (int i = 0; i < i_level; ++i, dst += indent_len)
+ memcpy( dst, indent, indent_len );
+
+ strcat( dst, prefix );
+ strcat( dst, fmt );
+
+ msg_GenericVa( &demuxer, VLC_MSG_DBG, buffer, args );
+
+ if (buffer != fixed_buffer)
+ delete [] buffer;
+}
+
+void MkvTree( demux_t & demuxer, int i_level, const char *psz_format, ... )
+{
+ va_list args; va_start( args, psz_format );
+ MkvTree_va( demuxer, i_level, psz_format, args );
+ va_end( args );
+}
diff --git a/modules/demux/mkv/util.hpp b/modules/demux/mkv/util.hpp
index 8c6cc6a..5867d1d 100644
--- a/modules/demux/mkv/util.hpp
+++ b/modules/demux/mkv/util.hpp
@@ -90,3 +90,7 @@ public:
};
block_t * packetize_wavpack( mkv_track_t *, uint8_t *, size_t);
+
+/* helper functions to print the mkv parse tree */
+void MkvTree_va( demux_t& demuxer, int i_level, const char* fmt, va_list args);
+void MkvTree( demux_t & demuxer, int i_level, const char *psz_format, ... );
--
2.7.2
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