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Add av_append_packet function, to be used in code that merges packets

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to allow palette handling without using PaletteControl.

Originally committed as revision 25777 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Reimar Döffinger 2010-11-21 10:24:48 +00:00
parent a08d918e68
commit 6bfc268305
2 changed files with 31 additions and 1 deletions
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17
libavformat/avformat.h
View File

@ -22,7 +22,7 @@
#define AVFORMAT_AVFORMAT_H
#define LIBAVFORMAT_VERSION_MAJOR 52
#define LIBAVFORMAT_VERSION_MINOR 84
#define LIBAVFORMAT_VERSION_MINOR 85
#define LIBAVFORMAT_VERSION_MICRO 0
#define LIBAVFORMAT_VERSION_INT AV_VERSION_INT(LIBAVFORMAT_VERSION_MAJOR, \
@ -245,6 +245,21 @@ void av_metadata_free(AVMetadata **m);
int av_get_packet(ByteIOContext *s, AVPacket *pkt, int size);
/**
* Reads data and appends it to the current content of the AVPacket.
* If pkt->size is 0 it behaves like av_get_packet.
* Note that this uses av_grow_packet and thus involves a realloc
* which is inefficient. Thus this function should only be used
* when there is no reasonable way to know (an upper bound of)
* the final size.
*
* @param pkt packet
* @param size amount of data to read
* @return >0 (read size) if OK, AVERROR_xxx otherwise, previous data
* will not be lost even if an error occurs.
*/
int av_append_packet(ByteIOContext *s, AVPacket *pkt, int size);
/*************************************************/
/* fractional numbers for exact pts handling */

15
libavformat/utils.c
View File

@ -339,6 +339,21 @@ int av_get_packet(ByteIOContext *s, AVPacket *pkt, int size)
return ret;
}
int av_append_packet(ByteIOContext *s, AVPacket *pkt, int size)
{
int ret;
int old_size;
if (!pkt->size)
return av_get_packet(s, pkt, size);
old_size = pkt->size;
ret = av_grow_packet(pkt, size);
if (ret < 0)
return ret;
ret = get_buffer(s, pkt->data + old_size, size);
av_shrink_packet(pkt, old_size + FFMAX(ret, 0));
return ret;
}
int av_filename_number_test(const char *filename)
{