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buffer: implemet trim and set_size

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This commit is contained in:
Wim Taymans 2011-03-28 16:40:24 +02:00
parent 826a7d83d4
commit 9ff103b3a5
1 changed files with 59 additions and 2 deletions
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61
gst/gstbuffer.c
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@ -577,6 +577,62 @@ gst_buffer_get_size (GstBuffer * buffer)
return size;
}
/**
* gst_buffer_trim:
* @buffer: a #GstBuffer.
* @offset: the new offset
* @size: the new size
*
* Set the total size of the buffer
*/
void
gst_buffer_trim (GstBuffer * buffer, gsize offset, gsize size)
{
GPtrArray *arr;
guint len;
guint si, di;
gsize bsize;
GstMemory *mem;
g_return_if_fail (gst_buffer_is_writable (buffer));
arr = (GPtrArray *) buffer->memory;
len = arr->len;
si = di = 0;
/* copy and trim */
while (size > 0) {
mem = g_ptr_array_index (arr, si);
bsize = gst_memory_get_sizes (mem, NULL);
if (bsize <= offset) {
/* remove buffer */
gst_memory_unref (mem);
offset -= bsize;
} else {
gsize tocopy;
tocopy = MIN (bsize - offset, size);
if (tocopy < bsize) {
/* we need to clip something */
if (GST_MEMORY_IS_WRITABLE (mem)) {
gst_memory_trim (mem, offset, tocopy);
} else {
GstMemory *tmp;
tmp = gst_memory_sub (mem, offset, tocopy);
gst_memory_unref (mem);
mem = tmp;
}
}
g_ptr_array_index (arr, di) = mem;
size -= tocopy;
di++;
}
si++;
}
g_ptr_array_set_size (arr, di);
}
/**
* gst_buffer_set_size:
* @buffer: a #GstBuffer.
@ -587,8 +643,7 @@ gst_buffer_get_size (GstBuffer * buffer)
void
gst_buffer_set_size (GstBuffer * buffer, gsize size)
{
/* FIXME */
g_warning ("gst_buffer_set_size not imlpemented");
gst_buffer_trim (buffer, 0, size);
}
/**
@ -651,6 +706,8 @@ gst_buffer_map (GstBuffer * buffer, gsize * size, gsize * maxsize,
data = gst_memory_map (mem, size, maxsize, flags);
} else {
data = NULL;
if (size)
*size = 0;
}
return data;