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Append read data onto the buffer instead of overwriting, this ensures 

that the whole buffer is available for seeking back.
Fixes issue480

Originally committed as revision 15634 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Niedermayer 2008-10-18 17:30:37 +00:00
parent 8ddd280d2d
commit 4589dc5c4d
1 changed files with 10 additions and 5 deletions
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15
libavformat/aviobuf.c
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@ -290,20 +290,25 @@ void put_tag(ByteIOContext *s, const char *tag)
static void fill_buffer(ByteIOContext *s)
{
int len=0;
uint8_t *dst= s->buf_end - s->buffer < s->buffer_size ? s->buf_ptr : s->buffer;
int len= s->buffer_size - (dst - s->buffer);
assert(s->buf_ptr == s->buf_end);
/* no need to do anything if EOF already reached */
if (s->eof_reached)
return;
if(s->update_checksum){
if(s->update_checksum && dst == s->buffer){
if(s->buf_end > s->checksum_ptr)
s->checksum= s->update_checksum(s->checksum, s->checksum_ptr, s->buf_end - s->checksum_ptr);
s->checksum_ptr= s->buffer;
}
if(s->read_packet)
len = s->read_packet(s->opaque, s->buffer, s->buffer_size);
len = s->read_packet(s->opaque, dst, len);
else
len = 0;
if (len <= 0) {
/* do not modify buffer if EOF reached so that a seek back can
be done without rereading data */
@ -312,8 +317,8 @@ static void fill_buffer(ByteIOContext *s)
s->error= len;
} else {
s->pos += len;
s->buf_ptr = s->buffer;
s->buf_end = s->buffer + len;
s->buf_ptr = dst;
s->buf_end = dst + len;
}
}