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Add av_fifo_reset function to completely reset fifo state, which makes 

it easier to reuse the fifo.

Originally committed as revision 17901 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Reimar Döffinger 2009-03-09 09:26:32 +00:00
parent aa033b1ed7
commit 32b936d0c3
2 changed files with 13 additions and 1 deletions
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8
libavutil/fifo.c
View File

@ -27,9 +27,9 @@ AVFifoBuffer *av_fifo_alloc(unsigned int size)
AVFifoBuffer *f= av_mallocz(sizeof(AVFifoBuffer));
if(!f)
return NULL;
f->wptr = f->rptr =
f->buffer = av_malloc(size);
f->end = f->buffer + size;
av_fifo_reset(f);
if (!f->buffer)
av_freep(&f);
return f;
@ -43,6 +43,12 @@ void av_fifo_free(AVFifoBuffer *f)
}
}
void av_fifo_reset(AVFifoBuffer *f)
{
f->wptr = f->rptr = f->buffer;
f->wndx = f->rndx = 0;
}
int av_fifo_size(AVFifoBuffer *f)
{
return (uint32_t)(f->wndx - f->rndx);

6
libavutil/fifo.h
View File

@ -47,6 +47,12 @@ AVFifoBuffer *av_fifo_alloc(unsigned int size);
*/
void av_fifo_free(AVFifoBuffer *f);
/**
* Resets the AVFifoBuffer to the state right after av_fifo_alloc, in particular it is emptied.
* @param *f AVFifoBuffer to reset
*/
void av_fifo_reset(AVFifoBuffer *f);
/**
* Returns the amount of data in bytes in the AVFifoBuffer, that is the
* amount of data you can read from it.