[FFmpeg-cvslog] lavc: Document interaction between avcodec_open2() and decoding routines
Vittorio Giovara
git at videolan.org
Tue Feb 17 21:35:21 CET 2015
ffmpeg | branch: master | Vittorio Giovara <vittorio.giovara at gmail.com> | Thu Dec 4 19:56:38 2014 +0000| [cb70a93ca1e7fae1b5dfb65ad149d311a65206a4] | committer: Vittorio Giovara
lavc: Document interaction between avcodec_open2() and decoding routines
> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=cb70a93ca1e7fae1b5dfb65ad149d311a65206a4
---
libavcodec/avcodec.h | 12 ++++++++++++
1 file changed, 12 insertions(+)
diff --git a/libavcodec/avcodec.h b/libavcodec/avcodec.h
index 87f3a83..231b92b 100644
--- a/libavcodec/avcodec.h
+++ b/libavcodec/avcodec.h
@@ -3285,6 +3285,9 @@ void avcodec_free_frame(AVFrame **frame);
*
* @warning This function is not thread safe!
*
+ * @note Always call this function before using decoding routines (such as
+ * @ref avcodec_decode_video2()).
+ *
* @code
* avcodec_register_all();
* av_dict_set(&opts, "b", "2.5M", 0);
@@ -3614,6 +3617,9 @@ void avcodec_align_dimensions2(AVCodecContext *s, int *width, int *height,
* larger than the actual read bytes because some optimized bitstream
* readers read 32 or 64 bits at once and could read over the end.
*
+ * @note The AVCodecContext MUST have been opened with @ref avcodec_open2()
+ * before packets may be fed to the decoder.
+ *
* @param avctx the codec context
* @param[out] frame The AVFrame in which to store decoded audio samples.
* The decoder will allocate a buffer for the decoded frame by
@@ -3658,6 +3664,9 @@ int avcodec_decode_audio4(AVCodecContext *avctx, AVFrame *frame,
* between input and output, these need to be fed with avpkt->data=NULL,
* avpkt->size=0 at the end to return the remaining frames.
*
+ * @note The AVCodecContext MUST have been opened with @ref avcodec_open2()
+ * before packets may be fed to the decoder.
+ *
* @param avctx the codec context
* @param[out] picture The AVFrame in which the decoded video frame will be stored.
* Use av_frame_alloc() to get an AVFrame. The codec will
@@ -3696,6 +3705,9 @@ int avcodec_decode_video2(AVCodecContext *avctx, AVFrame *picture,
* and reusing a get_buffer written for video codecs would probably perform badly
* due to a potentially very different allocation pattern.
*
+ * @note The AVCodecContext MUST have been opened with @ref avcodec_open2()
+ * before packets may be fed to the decoder.
+ *
* @param avctx the codec context
* @param[out] sub The AVSubtitle in which the decoded subtitle will be stored, must be
freed with avsubtitle_free if *got_sub_ptr is set.
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