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GstBuffer: Inline fast-path for merged memory

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Edward Hervey 2018-11-21 16:13:48 +01:00 committed by Edward Hervey
parent 6c2dfe5ebe
commit e3d2eb1f16
1 changed files with 57 additions and 50 deletions
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107
gst/gstbuffer.c
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@ -234,72 +234,79 @@ _is_span (GstMemory ** mem, gsize len, gsize * poffset, GstMemory ** parent)
}
static GstMemory *
_get_merged_memory (GstBuffer * buffer, guint idx, guint length)
_actual_merged_memory (GstBuffer * buffer, guint idx, guint length)
{
GstMemory **mem, *result = NULL;
GST_CAT_LOG (GST_CAT_BUFFER, "buffer %p, idx %u, length %u", buffer, idx,
length);
GstMemory *parent = NULL;
gsize size, poffset = 0;
mem = GST_BUFFER_MEM_ARRAY (buffer);
if (G_UNLIKELY (length == 0)) {
result = NULL;
} else if (G_LIKELY (length == 1)) {
result = gst_memory_ref (mem[idx]);
size = gst_buffer_get_sizes_range (buffer, idx, length, NULL, NULL);
if (G_UNLIKELY (_is_span (mem + idx, length, &poffset, &parent))) {
if (!GST_MEMORY_IS_NO_SHARE (parent))
result = gst_memory_share (parent, poffset, size);
if (!result) {
GST_CAT_DEBUG (GST_CAT_PERFORMANCE, "copy for merge %p", parent);
result = gst_memory_copy (parent, poffset, size);
}
} else {
GstMemory *parent = NULL;
gsize size, poffset = 0;
gsize i, tocopy, left;
GstMapInfo sinfo, dinfo;
guint8 *ptr;
size = gst_buffer_get_sizes_range (buffer, idx, length, NULL, NULL);
result = gst_allocator_alloc (NULL, size, NULL);
if (result == NULL || !gst_memory_map (result, &dinfo, GST_MAP_WRITE)) {
GST_CAT_ERROR (GST_CAT_BUFFER, "Failed to map memory writable");
if (result)
gst_memory_unref (result);
return NULL;
}
if (G_UNLIKELY (_is_span (mem + idx, length, &poffset, &parent))) {
if (!GST_MEMORY_IS_NO_SHARE (parent))
result = gst_memory_share (parent, poffset, size);
if (!result) {
GST_CAT_DEBUG (GST_CAT_PERFORMANCE, "copy for merge %p", parent);
result = gst_memory_copy (parent, poffset, size);
}
} else {
gsize i, tocopy, left;
GstMapInfo sinfo, dinfo;
guint8 *ptr;
ptr = dinfo.data;
left = size;
result = gst_allocator_alloc (NULL, size, NULL);
if (result == NULL || !gst_memory_map (result, &dinfo, GST_MAP_WRITE)) {
GST_CAT_ERROR (GST_CAT_BUFFER, "Failed to map memory writable");
if (result)
gst_memory_unref (result);
for (i = idx; i < (idx + length) && left > 0; i++) {
if (!gst_memory_map (mem[i], &sinfo, GST_MAP_READ)) {
GST_CAT_ERROR (GST_CAT_BUFFER,
"buffer %p, idx %u, length %u failed to map readable", buffer,
idx, length);
gst_memory_unmap (result, &dinfo);
gst_memory_unref (result);
return NULL;
}
ptr = dinfo.data;
left = size;
for (i = idx; i < (idx + length) && left > 0; i++) {
if (!gst_memory_map (mem[i], &sinfo, GST_MAP_READ)) {
GST_CAT_ERROR (GST_CAT_BUFFER,
"buffer %p, idx %u, length %u failed to map readable", buffer,
idx, length);
gst_memory_unmap (result, &dinfo);
gst_memory_unref (result);
return NULL;
}
tocopy = MIN (sinfo.size, left);
GST_CAT_DEBUG (GST_CAT_PERFORMANCE,
"memcpy %" G_GSIZE_FORMAT " bytes for merge %p from memory %p",
tocopy, result, mem[i]);
memcpy (ptr, (guint8 *) sinfo.data, tocopy);
left -= tocopy;
ptr += tocopy;
gst_memory_unmap (mem[i], &sinfo);
}
gst_memory_unmap (result, &dinfo);
tocopy = MIN (sinfo.size, left);
GST_CAT_DEBUG (GST_CAT_PERFORMANCE,
"memcpy %" G_GSIZE_FORMAT " bytes for merge %p from memory %p",
tocopy, result, mem[i]);
memcpy (ptr, (guint8 *) sinfo.data, tocopy);
left -= tocopy;
ptr += tocopy;
gst_memory_unmap (mem[i], &sinfo);
}
gst_memory_unmap (result, &dinfo);
}
return result;
}
static inline GstMemory *
_get_merged_memory (GstBuffer * buffer, guint idx, guint length)
{
GST_CAT_LOG (GST_CAT_BUFFER, "buffer %p, idx %u, length %u", buffer, idx,
length);
if (G_UNLIKELY (length == 0))
return NULL;
if (G_LIKELY (length == 1))
return gst_memory_ref (GST_BUFFER_MEM_PTR (buffer, idx));
return _actual_merged_memory (buffer, idx, length);
}
static void
_replace_memory (GstBuffer * buffer, guint len, guint idx, guint length,
GstMemory * mem)