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audio: avoid buffer copy when nothing is clipped

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when nothing is clipped, return the input buffer instead of creating and
returning an identical copy.
This commit is contained in:
Wim Taymans 2012-03-09 16:17:54 +01:00
parent 0b17c3747a
commit 94869bff38
1 changed files with 19 additions and 15 deletions
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10
gst-libs/gst/audio/audio.c
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@ -832,7 +832,7 @@ gst_audio_buffer_clip (GstBuffer * buffer, GstSegment * segment, gint rate,
GstBuffer *ret; GstBuffer *ret;
GstClockTime timestamp = GST_CLOCK_TIME_NONE, duration = GST_CLOCK_TIME_NONE; GstClockTime timestamp = GST_CLOCK_TIME_NONE, duration = GST_CLOCK_TIME_NONE;
guint64 offset = GST_BUFFER_OFFSET_NONE, offset_end = GST_BUFFER_OFFSET_NONE; guint64 offset = GST_BUFFER_OFFSET_NONE, offset_end = GST_BUFFER_OFFSET_NONE;
gsize trim, size; gsize trim, size, osize;
gboolean change_duration = TRUE, change_offset = TRUE, change_offset_end = gboolean change_duration = TRUE, change_offset = TRUE, change_offset_end =
TRUE; TRUE;
@ -849,7 +849,7 @@ gst_audio_buffer_clip (GstBuffer * buffer, GstSegment * segment, gint rate,
* they won't be changed later though. */ * they won't be changed later though. */
trim = 0; trim = 0;
size = gst_buffer_get_size (buffer); osize = size = gst_buffer_get_size (buffer);
timestamp = GST_BUFFER_TIMESTAMP (buffer); timestamp = GST_BUFFER_TIMESTAMP (buffer);
GST_DEBUG ("timestamp %" GST_TIME_FORMAT, GST_TIME_ARGS (timestamp)); GST_DEBUG ("timestamp %" GST_TIME_FORMAT, GST_TIME_ARGS (timestamp));
@ -953,6 +953,10 @@ gst_audio_buffer_clip (GstBuffer * buffer, GstSegment * segment, gint rate,
} }
} }
if (trim == 0 && size == osize) {
/* nothing changed */
ret = buffer;
} else {
/* Get a writable buffer and apply all changes */ /* Get a writable buffer and apply all changes */
GST_DEBUG ("trim %" G_GSIZE_FORMAT " size %" G_GSIZE_FORMAT, trim, size); GST_DEBUG ("trim %" G_GSIZE_FORMAT " size %" G_GSIZE_FORMAT, trim, size);
ret = gst_buffer_copy_region (buffer, GST_BUFFER_COPY_ALL, trim, size); ret = gst_buffer_copy_region (buffer, GST_BUFFER_COPY_ALL, trim, size);
@ -967,7 +971,7 @@ gst_audio_buffer_clip (GstBuffer * buffer, GstSegment * segment, gint rate,
GST_BUFFER_OFFSET (ret) = offset; GST_BUFFER_OFFSET (ret) = offset;
if (change_offset_end) if (change_offset_end)
GST_BUFFER_OFFSET_END (ret) = offset_end; GST_BUFFER_OFFSET_END (ret) = offset_end;
}
return ret; return ret;
} }