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aviobuf: Add functions for null buffers

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Null buffers are useful for simulating writing to a real buffer
for the sake of measuring how many bytes are written.

Signed-off-by: Martin Storsjö <martin@martin.st>
This commit is contained in:
Martin Storsjö 2013-09-18 21:50:50 +03:00
parent bb461370e3
commit 3627ce2f1d
2 changed files with 51 additions and 0 deletions
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18
libavformat/avio_internal.h
View File

@ -119,4 +119,22 @@ 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

@ -975,3 +975,36 @@ 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;
}