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baseparse: make GstBaseParseFrame handling more bindings-friendly

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Change semantics of gst_base_parse_push_frame() and make it take
ownership of the whole frame, not just the frame contents. This
is more in line with how gst_pad_push() etc. work. Just transfering
the content, but not the container of something that's not really
known to be a container is hard to annotate properly and probably
won't work. We mark frames allocated on the stack now with a private
flag in gst_base_parse_frame_init(), so gst_base_parse_frame_free()
only frees the contents in that case but not the frame struct itself.

https://bugzilla.gnome.org/show_bug.cgi?id=518857

API: gst_base_parse_frame_new()
This commit is contained in:
Tim-Philipp Müller 2011-04-15 17:41:02 +01:00
parent 37d7857e18
commit e8ccbf4ca9
2 changed files with 74 additions and 38 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

101
libs/gst/base/gstbaseparse.c
View file

@ -199,6 +199,8 @@
#include "gstbaseparse.h"
#define GST_BASE_PARSE_FRAME_PRIVATE_FLAG_NOALLOC (1 << 0)
#define MIN_FRAMES_TO_POST_BITRATE 10
#define TARGET_DIFFERENCE (20 * GST_SECOND)
@ -398,8 +400,6 @@ static GstFlowReturn gst_base_parse_process_fragment (GstBaseParse * parse,
static gboolean gst_base_parse_is_seekable (GstBaseParse * parse);
static void gst_base_parse_frame_free (GstBaseParseFrame * frame);
static GstBaseParseFrame *gst_base_parse_frame_copy_and_clear (GstBaseParseFrame
* frame);
static void
gst_base_parse_clear_queues (GstBaseParse * parse)
@ -545,14 +545,20 @@ gst_base_parse_frame_copy (GstBaseParseFrame * frame)
copy = g_slice_dup (GstBaseParseFrame, frame);
copy->buffer = gst_buffer_ref (frame->buffer);
copy->_private_flags &= ~GST_BASE_PARSE_FRAME_PRIVATE_FLAG_NOALLOC;
return copy;
}
static void
gst_base_parse_frame_free (GstBaseParseFrame * frame)
{
if (frame->buffer)
if (frame->buffer) {
gst_buffer_unref (frame->buffer);
frame->buffer = NULL;
}
if (!(frame->_private_flags & GST_BASE_PARSE_FRAME_PRIVATE_FLAG_NOALLOC))
g_slice_free (GstBaseParseFrame, frame);
}
@ -578,36 +584,48 @@ gst_base_parse_frame_get_type (void)
* @frame: #GstBaseParseFrame.
*
* Sets a #GstBaseParseFrame to initial state. Currently this means
* all fields are zero-ed.
* all public fields are zero-ed and a private flag is set to make
* sure gst_base_parse_frame_free() only frees the contents but not
* the actual frame. Use this function to initialise a #GstBaseParseFrame
* allocated on the stack.
*
* Since: 0.10.33
*/
void
gst_base_parse_frame_init (GstBaseParse * parse, GstBaseParseFrame * frame)
{
memset (frame, 0, sizeof (*frame));
}
/* clear == frame no longer to be used following this */
static void
gst_base_parse_frame_clear (GstBaseParse * parse, GstBaseParseFrame * frame)
{
/* limited for now */
if (frame->buffer) {
gst_buffer_unref (frame->buffer);
frame->buffer = NULL;
}
}
/* copy frame (taking ownership of contents of passed frame) */
static GstBaseParseFrame *
gst_base_parse_frame_copy_and_clear (GstBaseParseFrame * frame)
{
GstBaseParseFrame *copy;
copy = g_slice_dup (GstBaseParseFrame, frame);
memset (frame, 0, sizeof (GstBaseParseFrame));
return copy;
frame->_private_flags = GST_BASE_PARSE_FRAME_PRIVATE_FLAG_NOALLOC;
}
/**
* gst_base_parse_frame_new:
* @buffer: (transfer none): a #GstBuffer
* @flags: the flags
* @overhead: number of bytes in this frame which should be counted as
* metadata overhead, ie. not used to calculate the average bitrate.
* Set to -1 to mark the entire frame as metadata. If in doubt, set to 0.
*
* Allocates a new #GstBaseParseFrame. This function is mainly for bindings,
* elements written in C should usually allocate the frame on the stack and
* then use gst_base_parse_frame_init() to initialise it.
*
* Returns: a newly-allocated #GstBaseParseFrame. Free with
* gst_base_parse_frame_free() when no longer needed, unless you gave
* away ownership to gst_base_parse_push_frame().
*
* Since: 0.10.33
*/
GstBaseParseFrame *
gst_base_parse_frame_new (GstBuffer * buffer, GstBaseParseFrameFlags flags,
gint overhead)
{
GstBaseParseFrame *frame;
frame = g_slice_new0 (GstBaseParseFrame);
frame->buffer = gst_buffer_ref (buffer);
return frame;
}
static inline void
@ -1507,7 +1525,7 @@ gst_base_parse_check_media (GstBaseParse * parse)
/* gst_base_parse_handle_and_push_buffer:
* @parse: #GstBaseParse.
* @klass: #GstBaseParseClass.
* @buffer: #GstBuffer.
* @frame: (transfer full): a #GstBaseParseFrame
*
* Parses the frame from given buffer and pushes it forward. Also performs
* timestamp handling and checks the segment limits.
@ -1607,11 +1625,18 @@ gst_base_parse_handle_and_push_frame (GstBaseParse * parse,
* frames to decide on the format and queues them internally */
/* convert internal flow to OK and mark discont for the next buffer. */
if (ret == GST_BASE_PARSE_FLOW_DROPPED) {
gst_base_parse_frame_clear (parse, frame);
gst_base_parse_frame_free (frame);
return GST_FLOW_OK;
} else if (ret == GST_BASE_PARSE_FLOW_QUEUED) {
if (!(frame->_private_flags & GST_BASE_PARSE_FRAME_PRIVATE_FLAG_NOALLOC)) {
/* frame allocated on the heap, we can just take ownership */
g_queue_push_tail (&parse->priv->queued_frames, frame);
} else {
/* probably allocated on the stack, must make a proper copy */
g_queue_push_tail (&parse->priv->queued_frames,
gst_base_parse_frame_copy_and_clear (frame));
gst_base_parse_frame_copy (frame));
gst_base_parse_frame_free (frame);
}
return GST_FLOW_OK;
} else if (ret != GST_FLOW_OK) {
return ret;
@ -1637,10 +1662,12 @@ gst_base_parse_handle_and_push_frame (GstBaseParse * parse,
/**
* gst_base_parse_push_frame:
* @parse: #GstBaseParse.
* @frame: #GstBaseParseFrame.
* @frame: (transfer full): a #GstBaseParseFrame
*
* Pushes the frame downstream, sends any pending events and
* does some timestamp and segment handling.
* does some timestamp and segment handling. Takes ownership
* of @frame and will clear it (if it was initialised with
* gst_base_parse_frame_init()) or free it.
*
* This must be called with sinkpad STREAM_LOCK held.
*
@ -1871,7 +1898,7 @@ gst_base_parse_push_frame (GstBaseParse * parse, GstBaseParseFrame * frame)
parse->segment.last_stop < last_stop)
gst_segment_set_last_stop (&parse->segment, GST_FORMAT_TIME, last_stop);
gst_base_parse_frame_clear (parse, frame);
gst_base_parse_frame_free (frame);
return ret;
}
@ -2541,7 +2568,7 @@ gst_base_parse_loop (GstPad * pad)
GstBaseParse *parse;
GstBaseParseClass *klass;
GstFlowReturn ret = GST_FLOW_OK;
GstBaseParseFrame frame = { 0, };
GstBaseParseFrame frame;
parse = GST_BASE_PARSE (gst_pad_get_parent (pad));
klass = GST_BASE_PARSE_GET_CLASS (parse);
@ -2558,6 +2585,7 @@ gst_base_parse_loop (GstPad * pad)
}
}
gst_base_parse_frame_init (parse, &frame);
ret = gst_base_parse_scan_frame (parse, klass, &frame, TRUE);
if (ret != GST_FLOW_OK)
goto done;
@ -3131,7 +3159,7 @@ gst_base_parse_find_frame (GstBaseParse * parse, gint64 * pos,
gboolean orig_drain, orig_discont;
GstFlowReturn ret = GST_FLOW_OK;
GstBuffer *buf = NULL;
GstBaseParseFrame frame = { 0, };
GstBaseParseFrame frame;
g_return_val_if_fail (GST_FLOW_ERROR, pos != NULL);
g_return_val_if_fail (GST_FLOW_ERROR, time != NULL);
@ -3150,6 +3178,8 @@ gst_base_parse_find_frame (GstBaseParse * parse, gint64 * pos,
GST_DEBUG_OBJECT (parse, "scanning for frame starting at %" G_GINT64_FORMAT
" (%#" G_GINT64_MODIFIER "x)", *pos, *pos);
gst_base_parse_frame_init (parse, &frame);
/* jump elsewhere and locate next frame */
parse->priv->offset = *pos;
ret = gst_base_parse_scan_frame (parse, klass, &frame, FALSE);
@ -3170,7 +3200,8 @@ gst_base_parse_find_frame (GstBaseParse * parse, gint64 * pos,
/* but it should provide proper time */
*time = GST_BUFFER_TIMESTAMP (buf);
*duration = GST_BUFFER_DURATION (buf);
gst_base_parse_frame_clear (parse, &frame);
gst_base_parse_frame_free (&frame);
GST_LOG_OBJECT (parse,
"frame with time %" GST_TIME_FORMAT " at offset %" G_GINT64_FORMAT,

7
libs/gst/base/gstbaseparse.h
View file

@ -148,8 +148,9 @@ typedef struct {
guint flags;
gint overhead;
/*< private >*/
gint _gst_reserved_i[2];
guint _gst_reserved_i[2];
gpointer _gst_reserved_p[2];
guint _private_flags;
} GstBaseParseFrame;
typedef struct _GstBaseParse GstBaseParse;
@ -259,6 +260,10 @@ GType gst_base_parse_get_type (void);
GType gst_base_parse_frame_get_type (void);
GstBaseParseFrame * gst_base_parse_frame_new (GstBuffer * buffer,
GstBaseParseFrameFlags flags,
gint overhead);
void gst_base_parse_frame_init (GstBaseParse * parse,
GstBaseParseFrame * frame);