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avcodec: attempt to clarify the CODEC_CAP_DELAY documentation

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This commit is contained in:
Justin Ruggles 2012-01-07 11:25:04 -05:00
parent 07837e4158
commit 3f6aa85ed4
1 changed files with 15 additions and 3 deletions
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18
libavcodec/avcodec.h
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@ -725,10 +725,22 @@ typedef struct RcOverride{
/* Codec can export data for HW decoding (XvMC). */ /* Codec can export data for HW decoding (XvMC). */
#define CODEC_CAP_HWACCEL 0x0010 #define CODEC_CAP_HWACCEL 0x0010
/** /**
* Codec has a nonzero delay and needs to be fed with avpkt->data=NULL, * Encoder or decoder requires flushing with NULL input at the end in order to
* give the complete and correct output.
*
* NOTE: If this flag is not set, the codec is guaranteed to never be fed with
* with NULL data. The user can still send NULL data to the public encode
* or decode function, but libavcodec will not pass it along to the codec
* unless this flag is set.
*
* Decoders:
* The decoder has a non-zero delay and needs to be fed with avpkt->data=NULL,
* avpkt->size=0 at the end to get the delayed data until the decoder no longer * avpkt->size=0 at the end to get the delayed data until the decoder no longer
* returns frames. If this is not set, the codec is guaranteed to never be fed * returns frames.
* with NULL data. *
* Encoders:
* The encoder needs to be fed with NULL data at the end of encoding until the
* encoder no longer returns data.
*/ */
#define CODEC_CAP_DELAY 0x0020 #define CODEC_CAP_DELAY 0x0020
/** /**