[FFmpeg-devel] [PATCH 2/2] avformat: add av_register_one() to register one codec/parser/bsf/hwaccel/muxer/demuxer by its char* name

[Michael Niedermayer]

Signed-off-by: Michael Niedermayer <michaelni at gmx.at>
---
 libavformat/allformats.c |   44 +++++++++++++++++++++++++++++++-------------
 libavformat/avformat.h   |    5 +++++
 2 files changed, 36 insertions(+), 13 deletions(-)

diff --git a/libavformat/allformats.c b/libavformat/allformats.c
index d54ed9b..b613bed 100644
--- a/libavformat/allformats.c
+++ b/libavformat/allformats.c
@@ -26,37 +26,42 @@
 #include "version.h"
 
 #define REGISTER_MUXER(X, x)                                            \
-    {                                                                   \
+    if (!name || !strcmp(name, AV_STRINGIFY(x##_muxer))) {              \
         extern AVOutputFormat ff_##x##_muxer;                           \
-        if (CONFIG_##X##_MUXER)                                         \
+        if (CONFIG_##X##_MUXER) {                                       \
             av_register_output_format(&ff_##x##_muxer);                 \
+            found++;                                                    \
+        }                                                               \
     }
 
 #define REGISTER_DEMUXER(X, x)                                          \
-    {                                                                   \
+    if (!name || !strcmp(name, AV_STRINGIFY(x##_demuxer))) {            \
         extern AVInputFormat ff_##x##_demuxer;                          \
-        if (CONFIG_##X##_DEMUXER)                                       \
+        if (CONFIG_##X##_DEMUXER) {                                     \
             av_register_input_format(&ff_##x##_demuxer);                \
+            found++;                                                    \
+        }                                                               \
     }
 
 #define REGISTER_MUXDEMUX(X, x) REGISTER_MUXER(X, x); REGISTER_DEMUXER(X, x)
 
 #define REGISTER_PROTOCOL(X, x)                                         \
-    {                                                                   \
+    if (!name || !strcmp(name, AV_STRINGIFY(x##_protocol))) {           \
         extern URLProtocol ff_##x##_protocol;                           \
-        if (CONFIG_##X##_PROTOCOL)                                      \
+        if (CONFIG_##X##_PROTOCOL) {                                    \
             ffurl_register_protocol(&ff_##x##_protocol);                \
+            found++;                                                    \
+        }                                                               \
     }
 
-void av_register_all(void)
+int av_register_one(const char *name)
 {
-    static int initialized;
-
-    if (initialized)
-        return;
-    initialized = 1;
+    int found = 0;
 
-    avcodec_register_all();
+    if (name) {
+        found = avcodec_register_one(name);
+    } else
+        avcodec_register_all();
 
     /* (de)muxers */
     REGISTER_MUXER   (A64,              a64);
@@ -383,4 +388,17 @@ void av_register_all(void)
     REGISTER_PROTOCOL(LIBRTMPTE,        librtmpte);
     REGISTER_PROTOCOL(LIBSSH,           libssh);
     REGISTER_PROTOCOL(LIBSMBCLIENT,     libsmbclient);
+
+    return found;
 }
+
+void av_register_all(void)
+{
+    static int initialized;
+
+    if (initialized)
+        return;
+    initialized = 1;
+
+    av_register_one(NULL);
+}
\ No newline at end of file
diff --git a/libavformat/avformat.h b/libavformat/avformat.h
index 78054de..902a329 100644
--- a/libavformat/avformat.h
+++ b/libavformat/avformat.h
@@ -1782,6 +1782,11 @@ const char *avformat_license(void);
  */
 void av_register_all(void);
 
+/**
+ * @returns the number of newly registered entities
+ */
+int av_register_one(const char *name);
+
 void av_register_input_format(AVInputFormat *format);
 void av_register_output_format(AVOutputFormat *format);
 
-- 
1.7.9.5