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Merge commit '3627ce2f1dab1d33b7f99d78907a3e4d86b7d847'

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* commit '3627ce2f1dab1d33b7f99d78907a3e4d86b7d847':
  aviobuf: Add functions for null buffers

Merged-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2013-09-20 12:25:58 +02:00
commit 2ad8056c5e
2 changed files with 51 additions and 0 deletions
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18
libavformat/avio_internal.h
View File

@ -130,4 +130,22 @@ int ffio_open_dyn_packet_buf(AVIOContext **s, int max_packet_size);
*/
int ffio_fdopen(AVIOContext **s, URLContext *h);
/**
* Open a write-only fake memory stream. The written data is not stored
* anywhere - this is only used for measuring the amount of data
* written.
*
* @param s new IO context
* @return zero if no error.
*/
int ffio_open_null_buf(AVIOContext **s);
/**
* Close a null buffer.
*
* @param s an IO context opened by ffio_open_null_buf
* @return the number of bytes written to the null buffer
*/
int ffio_close_null_buf(AVIOContext *s);
#endif /* AVFORMAT_AVIO_INTERNAL_H */

33
libavformat/aviobuf.c
View File

@ -1045,3 +1045,36 @@ int avio_close_dyn_buf(AVIOContext *s, uint8_t **pbuffer)
av_free(s);
return size - padding;
}
static int null_buf_write(void *opaque, uint8_t *buf, int buf_size)
{
DynBuffer *d = opaque;
d->pos += buf_size;
if (d->pos > d->size)
d->size = d->pos;
return buf_size;
}
int ffio_open_null_buf(AVIOContext **s)
{
int ret = url_open_dyn_buf_internal(s, 0);
if (ret >= 0) {
AVIOContext *pb = *s;
pb->write_packet = null_buf_write;
}
return ret;
}
int ffio_close_null_buf(AVIOContext *s)
{
DynBuffer *d = s->opaque;
int size;
avio_flush(s);
size = d->size;
av_free(d);
av_free(s);
return size;
}