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avformat/aviobuf: Add function to reset dynamic buffer 

Resetting a dynamic buffer means to keep the AVIOContext and the
internal buffer used by the dynamic buffer. This is done in order to
save (re)allocations when one has a workflow where one opens and closes
dynamic buffers in sequence.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
This commit is contained in:
Andreas Rheinhardt 2019-11-26 07:53:52 +01:00
parent 5cdd2ebb55
commit 639728f51a
2 changed files with 18 additions and 0 deletions
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7
libavformat/avio_internal.h
View File

@ -171,6 +171,13 @@ int ffio_open_whitelist(AVIOContext **s, const char *url, int flags,
*/
int ffio_close_null_buf(AVIOContext *s);
/**
* Reset a dynamic buffer.
*
* Resets everything, but keeps the allocated buffer for later use.
*/
void ffio_reset_dyn_buf(AVIOContext *s);
/**
* Free a dynamic buffer.
*

11
libavformat/aviobuf.c
View File

@ -1407,6 +1407,17 @@ int avio_get_dyn_buf(AVIOContext *s, uint8_t **pbuffer)
return d->size;
}
void ffio_reset_dyn_buf(AVIOContext *s)
{
DynBuffer *d = s->opaque;
int max_packet_size = s->max_packet_size;
ffio_init_context(s, d->io_buffer, d->io_buffer_size, 1, d, NULL,
s->write_packet, s->seek);
s->max_packet_size = max_packet_size;
d->pos = d->size = 0;
}
int avio_close_dyn_buf(AVIOContext *s, uint8_t **pbuffer)
{
DynBuffer *d;