avcodec.h: Clarify AVCodecContext::pix_fmt documentation since its value may be set by the demuxer

rawdec.c: Only perform bits_per_coded_sample -> pix_fmt guesswork if pix_fmt hasn't been set

Originally committed as revision 23561 to svn://svn.ffmpeg.org/ffmpeg/trunk

1 files changed, 3 insertions, 1 deletions

diff --git a/libavcodec/avcodec.h b/libavcodec/avcodec.h
index 5e77fb3592..ffc2e07ce8 100644
--- a/libavcodec/avcodec.h
+++ b/libavcodec/avcodec.h
@@ -1121,8 +1121,10 @@ typedef struct AVCodecContext {
 
     /**
      * Pixel format, see PIX_FMT_xxx.
+     * May be set by the demuxer if known from headers.
+     * May be overriden by the decoder if it knows better.
      * - encoding: Set by user.
-     * - decoding: Set by libavcodec.
+     * - decoding: Set by user if known, overridden by libavcodec if known
      */
     enum PixelFormat pix_fmt;