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libavformat/avio: Add avio_get_dyn_buf function 

This commit adds the avio_get_dyn_buf function which allows accessing
the
content of a DynBuffer without destroying it.

This is required in matroskaenc for preliminary writing (correct) mkv
headers.

Context for this change is fixing regression bug #5977.

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
softworkz 2017-01-05 01:33:26 +01:00 committed by Michael Niedermayer
parent 90ac9f4094
commit 9488032e10
4 changed files with 33 additions and 1 deletions
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3
doc/APIchanges
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@ -15,6 +15,9 @@ libavutil: 2015-08-28
API changes, most recent first:
2017-01-06 - xxxxxxx - lavf 57.62.100- avio.h
Add avio_get_dyn_buf()
2016-12-10 - xxxxxxx - lavu xx.xx.100- imgutils.h
Add av_image_check_size2()

12
libavformat/avio.h
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@ -703,6 +703,18 @@ int avio_closep(AVIOContext **s);
*/
int avio_open_dyn_buf(AVIOContext **s);
/**
* Return the written size and a pointer to the buffer.
* The AVIOContext stream is left intact.
* The buffer must NOT be freed.
* No padding is added to the buffer.
*
* @param s IO context
* @param pbuffer pointer to a byte buffer
* @return the length of the byte buffer
*/
int avio_get_dyn_buf(AVIOContext *s, uint8_t **pbuffer);
/**
* Return the written size and a pointer to the buffer. The buffer
* must be freed with av_free().

17
libavformat/aviobuf.c
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@ -1277,6 +1277,23 @@ int ffio_open_dyn_packet_buf(AVIOContext **s, int max_packet_size)
return url_open_dyn_buf_internal(s, max_packet_size);
}
int avio_get_dyn_buf(AVIOContext *s, uint8_t **pbuffer)
{
DynBuffer *d;
if (!s) {
*pbuffer = NULL;
return 0;
}
avio_flush(s);
d = s->opaque;
*pbuffer = d->buffer;
return d->size;
}
int avio_close_dyn_buf(AVIOContext *s, uint8_t **pbuffer)
{
DynBuffer *d;

2
libavformat/version.h
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@ -32,7 +32,7 @@
// Major bumping may affect Ticket5467, 5421, 5451(compatibility with Chromium)
// Also please add any ticket numbers that you believe might be affected here
#define LIBAVFORMAT_VERSION_MAJOR 57
#define LIBAVFORMAT_VERSION_MINOR 61
#define LIBAVFORMAT_VERSION_MINOR 62
#define LIBAVFORMAT_VERSION_MICRO 100
#define LIBAVFORMAT_VERSION_INT AV_VERSION_INT(LIBAVFORMAT_VERSION_MAJOR, \