Merge commit '8e134e5104e99a69cd4cea10540a7ce9c3682a2c'

* commit '8e134e5104e99a69cd4cea10540a7ce9c3682a2c':
  lavc: clarify get_buffer() documentation
  mpegaudiodec: use planar sample format for output unless packed is requested
  x86: h264 qpel: use the correct number of utilized xmm regs in cglobal

Merged-by: Michael Niedermayer <michaelni@gmx.at>

1 files changed, 6 insertions, 1 deletions

diff --git a/libavcodec/avcodec.h b/libavcodec/avcodec.h
index 5ebad92604..b6a4b0ec24 100644
--- a/libavcodec/avcodec.h
+++ b/libavcodec/avcodec.h
@@ -2406,7 +2406,12 @@ typedef struct AVCodecContext {
      *
      * Decoders cannot use the buffer after returning from
      * avcodec_decode_audio4(), so they will not call release_buffer(), as it
-     * is assumed to be released immediately upon return.
+     * is assumed to be released immediately upon return. In some rare cases,
+     * a decoder may need to call get_buffer() more than once in a single
+     * call to avcodec_decode_audio4(). In that case, when get_buffer() is
+     * called again after it has already been called once, the previously
+     * acquired buffer is assumed to be released at that time and may not be
+     * reused by the decoder.
      *
      * As a convenience, av_samples_get_buffer_size() and
      * av_samples_fill_arrays() in libavutil may be used by custom get_buffer()