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buffer: fix resize function some more

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Don't remove memory blocks from the buffer when we clip and resize, instead set
the memory offset and size to 0. This allows us to make the buffer larger again
later.
This commit is contained in:
Wim Taymans 2011-07-12 14:07:57 +02:00
parent a19baf77e7
commit 1a3f48f427
1 changed files with 38 additions and 37 deletions
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75
gst/gstbuffer.c
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@ -817,7 +817,7 @@ void
gst_buffer_resize (GstBuffer * buffer, gssize offset, gsize size)
{
guint len;
guint si, di;
guint i;
gsize bsize, bufsize, bufoffs, bufmax;
GstMemory *mem;
@ -842,46 +842,47 @@ gst_buffer_resize (GstBuffer * buffer, gssize offset, gsize size)
len = GST_BUFFER_MEM_LEN (buffer);
/* copy and trim */
for (di = si = 0; si < len; si++) {
mem = GST_BUFFER_MEM_PTR (buffer, si);
for (i = 0; i < len; i++) {
gsize left, noffs;
mem = GST_BUFFER_MEM_PTR (buffer, i);
bsize = gst_memory_get_sizes (mem, NULL, NULL);
if ((gssize) bsize <= offset) {
/* remove buffer */
GST_CAT_LOG (GST_CAT_BUFFER, "remove memory %p", mem);
gst_memory_unref (mem);
offset -= bsize;
} else {
gsize left;
/* last buffer always gets resized to the remaining size */
if (si + 1 == len)
left = size;
else
left = MIN (bsize - offset, size);
if (offset != 0 || left != bsize) {
/* we need to clip something */
if (GST_MEMORY_IS_WRITABLE (mem)) {
gst_memory_resize (mem, offset, left);
} else {
GstMemory *tmp;
if (mem->flags & GST_MEMORY_FLAG_NO_SHARE)
tmp = gst_memory_copy (mem, offset, left);
else
tmp = gst_memory_share (mem, offset, left);
gst_memory_unref (mem);
mem = tmp;
}
offset = 0;
}
GST_BUFFER_MEM_PTR (buffer, di++) = mem;
size -= left;
noffs = 0;
/* last buffer always gets resized to the remaining size */
if (i + 1 == len)
left = size;
/* shrink buffers before the offset */
else if ((gssize) bsize <= offset) {
left = 0;
noffs = offset - bsize;
offset = 0;
}
/* clip other buffers */
else
left = MIN (bsize - offset, size);
if (offset != 0 || left != bsize) {
/* we need to clip something */
if (GST_MEMORY_IS_WRITABLE (mem)) {
gst_memory_resize (mem, offset, left);
} else {
GstMemory *tmp;
if (mem->flags & GST_MEMORY_FLAG_NO_SHARE)
tmp = gst_memory_copy (mem, offset, left);
else
tmp = gst_memory_share (mem, offset, left);
gst_memory_unref (mem);
mem = tmp;
}
}
offset = noffs;
size -= left;
GST_BUFFER_MEM_PTR (buffer, i) = mem;
}
GST_BUFFER_MEM_LEN (buffer) = di;
}
/**