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Code Issues Releases Activity

avformat/aviobuf: Add ffio_ensure_seekback()

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Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2013-06-30 18:18:13 +02:00
parent 2ca48e4666
commit 186ec17843
2 changed files with 34 additions and 0 deletions
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9
libavformat/avio_internal.h
View File

@ -71,6 +71,15 @@ uint64_t ffio_read_varlen(AVIOContext *bc);
/** @warning must be called before any I/O */
int ffio_set_buf_size(AVIOContext *s, int buf_size);
/**
* Ensures that the requested seekback buffer size will be available
*
* Will ensure that when reading sequentially up to buf_size, seeking
* within the current pos and pos+buf_size is possible.
* Once the stream position moves outside this window this gurantee is lost.
*/
int ffio_ensure_seekback(AVIOContext *s, int buf_size);
int ffio_limit(AVIOContext *s, int size);
void ffio_init_checksum(AVIOContext *s,

25
libavformat/aviobuf.c
View File

@ -725,6 +725,31 @@ int ffio_fdopen(AVIOContext **s, URLContext *h)
return 0;
}
int ffio_ensure_seekback(AVIOContext *s, int buf_size)
{
uint8_t *buffer;
int max_buffer_size = s->max_packet_size ?
s->max_packet_size : IO_BUFFER_SIZE;
buf_size += s->buf_ptr - s->buffer + max_buffer_size;
if (buf_size < s->buffer_size || s->seekable)
return 0;
av_assert0(!s->write_flag);
buffer = av_malloc(buf_size);
if (!buffer)
return AVERROR(ENOMEM);
memcpy(buffer, s->buffer, s->buffer_size);
av_free(s->buffer);
s->buf_ptr = buffer + (s->buf_ptr - s->buffer);
s->buf_end = buffer + (s->buf_end - s->buffer);
s->buffer = buffer;
s->buffer_size = buf_size;
return 0;
}
int ffio_set_buf_size(AVIOContext *s, int buf_size)
{
uint8_t *buffer;