multithreaded/SMP motion estimation

multithreaded/SMP encoding for MPEG1/MPEG2/MPEG4/H263
all pthread specific code is in pthread.c
to try it, run configure --enable-pthreads and ffmpeg ... -threads <num>
the internal thread API is a simple AVCodecContext.execute() callback which executes a given function pointer with different arguments and returns after finishing all, that way no mutexes or other thread-mess is needed outside pthread.c

Originally committed as revision 2772 to svn://svn.ffmpeg.org/ffmpeg/trunk

1 files changed, 12 insertions, 0 deletions

diff --git a/libavcodec/utils.c b/libavcodec/utils.c
index d04c2faaf0..e49ddd07f0 100644
--- a/libavcodec/utils.c
+++ b/libavcodec/utils.c
@@ -324,6 +324,16 @@ int avcodec_default_reget_buffer(AVCodecContext *s, AVFrame *pic){
     return 0;
 }
 
+int avcodec_default_execute(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2),void **arg, int *ret, int count){
+    int i;
+
+    for(i=0; i<count; i++){
+        int r= func(c, arg[i]);
+        if(ret) ret[i]= r;
+    }
+    return 0;
+}
+
 enum PixelFormat avcodec_default_get_format(struct AVCodecContext *s, enum PixelFormat * fmt){
     return fmt[0];
 }
@@ -352,6 +362,8 @@ void avcodec_get_context_defaults(AVCodecContext *s){
     s->get_buffer= avcodec_default_get_buffer;
     s->release_buffer= avcodec_default_release_buffer;
     s->get_format= avcodec_default_get_format;
+    s->execute= avcodec_default_execute;
+    s->thread_count=1;
     s->me_subpel_quality=8;
     s->lmin= FF_QP2LAMBDA * s->qmin;
     s->lmax= FF_QP2LAMBDA * s->qmax;