Add slice-based parallel H.264 decoding

Patch by Andreas Öman % andreas A olebyn P nu %
NB: depends on having a thread library activated at config time, and on
having a source encoded with multiple slices
Original threads:
date: May 18, 2007 11:00 PM
subject: [FFmpeg-devel] Parallelized h264 proof-of-concept
date: Jun 15, 2007 10:10 PM
subject: [FFmpeg-devel] [PATCH] h264 parallelized, (was: Parallelized h264 proof-of-concept)
date: Jun 25, 2007 7:02 PM
subject: Re: [FFmpeg-devel] [PATCH] h264 parallelized

Originally committed as revision 10407 to svn://svn.ffmpeg.org/ffmpeg/trunk

1 files changed, 29 insertions, 0 deletions

diff --git a/libavcodec/h264.h b/libavcodec/h264.h
index d06bb33a42..8dd6cdd1af 100644
--- a/libavcodec/h264.h
+++ b/libavcodec/h264.h
@@ -380,6 +380,35 @@ typedef struct H264Context{
     const uint8_t *field_scan8x8_cavlc_q0;
 
     int x264_build;
+
+    /**
+     * @defgroup multithreading Members for slice based multithreading
+     * @{
+     */
+    struct H264Context *thread_context[MAX_THREADS];
+
+    /**
+     * current slice number, used to initalize slice_num of each thread/context
+     */
+    int current_slice;
+
+    /**
+     * Max number of threads / contexts.
+     * This is equal to AVCodecContext.thread_count unless
+     * multithreaded decoding is impossible, in which case it is
+     * reduced to 1.
+     */
+    int max_contexts;
+
+    /**
+     *  1 if the single thread fallback warning has already been
+     *  displayed, 0 otherwise.
+     */
+    int single_decode_warning;
+
+    int last_slice_type;
+    /** @} */
+
 }H264Context;
 
 #endif /* H264_H */