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gst/elements/gstfilesink.c (gst_file_sink_start)
Original commit message from CVS: 2005-11-09 Andy Wingo <wingo@pobox.com> * gst/elements/gstfilesink.c (gst_file_sink_start) (gst_file_sink_stop): New functions, replace the state change handler. (gst_file_sink_class_init): Hook up the start and stop functions. (gst_file_sink_base_init): Don't set the state change handler any more. It was a bit ugly too, being set from here... (gst_file_sink_get_property, gst_file_sink_set_property): Cleanups... (gst_file_sink_set_location): More robust check that doesn't call GST_STATE. Ugggggg.
This commit is contained in:
Andy Wingo
parent
2d000e0460
commit
0ae7675f7e
5 changed files with 140 additions and 60 deletions
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@ -1,5 +1,7 @@
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2005-11-09 Andy Wingo <wingo@pobox.com>
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* gst/base/gstadapter.c: More adapter docs.
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* gst/elements/gstfilesink.c (gst_file_sink_start)
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(gst_file_sink_stop): New functions, replace the state change
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handler.
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@ -19,8 +19,7 @@
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/**
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* SECTION:gstadapter
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* @short_description: object to splice and merge buffers to desired size
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* @see_also: #GstBytestream, #GstFilePad
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* @short_description: adapts incoming data on a sink pad into chunks of N bytes
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*
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* This class is for elements that receive buffers in an undesired size.
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* While for example raw video contains one image per buffer, the same is not
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@ -31,31 +30,55 @@
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* The theory of operation is like this: All buffers received are put
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* into the adapter using gst_adapter_push() and the data is then read back
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* in chunks of the desired size using gst_adapter_peek(). After the data is
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* processed, it is freed using gst_adapter_flush(). An example function that
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* needs to process data in 10 byte chunks could look like this:
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* processed, it is freed using gst_adapter_flush().
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*
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* For example, a sink pad's chain function that needs to pass data to a library
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* in 512-byte chunks could be implemented like this:
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* <programlisting>
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* void
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* process_buffer (GstAdapter *adapter, GstBuffer *buffer)
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* static GstFlowReturn
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* sink_pad_chain (GstPad *pad, GstBuffer *buffer)
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* {
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* guint8 *data;
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* MyElement *this;
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* GstAdapter *adapter;
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* GstFlowReturn ret = GST_FLOW_OK;
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*
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* // will give the element an extra ref; remember to drop it
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* this = MY_ELEMENT (gst_pad_get_parent (pad));
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* adapter = this->adapter;
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*
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* // put buffer into adapter
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* #gst_adapter_push (adapter, buffer);
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* // while we can read out 10 bytes, process them
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* while ((data = #gst_adapter_peek (adapter, 10))) {
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* // process the 10 bytes here
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* // after processing the data, flush it
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* #gst_adapter_flush (adapter, 10);
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* // while we can read out 512 bytes, process them
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* while (#gst_adapter_available (adapter) >= 512 && fret == GST_FLOW_OK) {
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* // use flowreturn as an error value
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* ret = my_library_foo (#gst_adapter_peek (adapter, 512));
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* #gst_adapter_flush (adapter, 512);
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* }
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*
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* gst_object_unref (this);
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* return ret;
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* }
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* </programlisting>
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* For another example, a simple element inside GStreamer that uses GstAdapter
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* is the libvisual element.
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*
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* An element using GstAdapter in its sink pad chain function should ensure that
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* when the FLUSH_STOP event is received, that any queued data is cleared using
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* gst_adapter_clear(). Data should also be cleared or processed on EOS and
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* when changing state from #GST_STATE_PAUSED to #GST_STATE_READY.
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*
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* A last thing to note is that while GstAdapter is pretty optimized,
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* merging buffers still might be an operation that requires a memcpy()
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* operation, and this operation is not the fastest. Because of this, some
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* functions like gst_adapter_available_fast() are provided to help speed up
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* such cases should you want to.
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*
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* GstAdapter is not MT safe. All operations on an adapter must be serialized by
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* the caller. This is not normally a problem, however, as the normal use case
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* of GstAdapter is inside one pad's chain function, in which case access is
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* serialized via the pad's stream lock.
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*
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* Last reviewed on 2005-11-08 (0.9.5).
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*/
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#include <string.h>
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@ -70,13 +93,16 @@ GST_DEBUG_CATEGORY_STATIC (gst_adapter_debug);
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#define _do_init(thing) \
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GST_DEBUG_CATEGORY_INIT (gst_adapter_debug, "adapter", 0, "object to splice and merge buffers to desired size")
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GST_BOILERPLATE_FULL (GstAdapter, gst_adapter, GObject, G_TYPE_OBJECT, _do_init)
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GST_BOILERPLATE_FULL (GstAdapter, gst_adapter, GObject, G_TYPE_OBJECT,
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_do_init);
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static void gst_adapter_dispose (GObject * object);
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static void gst_adapter_finalize (GObject * object);
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static void gst_adapter_dispose (GObject * object);
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static void gst_adapter_finalize (GObject * object);
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static void gst_adapter_base_init (gpointer g_class)
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static void
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gst_adapter_base_init (gpointer g_class)
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{
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/* nop */
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}
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static void
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@ -130,9 +156,9 @@ gst_adapter_new (void)
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/**
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* gst_adapter_clear:
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* @adapter: the #GstAdapter to clear
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* @adapter: a #GstAdapter
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*
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* Removes all buffers from the @adapter.
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* Removes all buffers from @adapter.
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*/
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void
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gst_adapter_clear (GstAdapter * adapter)
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@ -168,13 +194,22 @@ gst_adapter_push (GstAdapter * adapter, GstBuffer * buf)
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/**
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* gst_adapter_peek:
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* @adapter: a #GstAdapter
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* @size: number of bytes to peek
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* @size: the number of bytes to peek
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*
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* Gets the first @size bytes stored in the @adapter. If this many bytes are
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* not available, it returns NULL. The returned pointer is valid until the next
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* function is called on the adapter.
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* Gets the first @size bytes stored in the @adapter. The returned pointer is
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* valid until the next function is called on the adapter.
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*
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* Returns: a pointer to the first @size bytes of data or NULL
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* Note that setting the returned pointer as the data of a #GstBuffer is
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* incorrect for general-purpose plugins. The reason is that if a downstream
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* element stores the buffer so that it has access to it outside of the bounds
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* of its chain function, the buffer will have an invalid data pointer after
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* your element flushes the bytes. In that case you should use
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* gst_adapter_take(), which returns a freshly-allocated buffer that you can set
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* as #GstBuffer malloc_data.
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*
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* Returns #NULL if @size bytes are not available.
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*
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* Returns: a pointer to the first @size bytes of data, or NULL.
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*/
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const guint8 *
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gst_adapter_peek (GstAdapter * adapter, guint size)
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@ -226,9 +261,11 @@ gst_adapter_peek (GstAdapter * adapter, guint size)
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/**
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* gst_adapter_flush:
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* @adapter: a #GstAdapter
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* @flush: number of bytes to flush
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* @flush: the number of bytes to flush
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*
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* Flushes the first @flush bytes of the @adapter.
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* Flushes the first @flush bytes out of @adapter.
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*
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* See also: gst_adapter_peek().
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*/
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void
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gst_adapter_flush (GstAdapter * adapter, guint flush)
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@ -260,12 +297,14 @@ gst_adapter_flush (GstAdapter * adapter, guint flush)
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/**
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* gst_adapter_take:
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* @adapter: a #GstAdapter
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* @nbytes: number of bytes to take
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* @nbytes: the number of bytes to take
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*
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* Returns a freshly allocated buffer containing the first @nbytes bytes of the
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* @adapter. g_free() the return value after use.
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* @adapter.
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*
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* Returns: oven-fresh hot data, or NULL if @nbytes bytes are not available
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* Caller owns returned value.
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*
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* Returns: oven-fresh hot data, or #NULL if @nbytes bytes are not available
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*/
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guint8 *
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gst_adapter_take (GstAdapter * adapter, guint nbytes)
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@ -299,7 +338,7 @@ gst_adapter_take (GstAdapter * adapter, guint nbytes)
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* value that can be supplied to gst_adapter_peek() without that function
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* returning NULL.
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*
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* Returns: amount of bytes available in @adapter
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* Returns: number of bytes available in @adapter
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*/
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guint
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gst_adapter_available (GstAdapter * adapter)
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@ -45,6 +45,7 @@ typedef struct _GstAdapterClass GstAdapterClass;
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struct _GstAdapter {
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GObject object;
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/*< private >*/
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GSList * buflist;
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guint size;
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guint skip;
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@ -54,7 +55,6 @@ struct _GstAdapter {
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guint assembled_size;
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guint assembled_len;
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/*< private >*/
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gpointer _gst_reserved[GST_PADDING];
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};
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@ -19,8 +19,7 @@
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/**
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* SECTION:gstadapter
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* @short_description: object to splice and merge buffers to desired size
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* @see_also: #GstBytestream, #GstFilePad
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* @short_description: adapts incoming data on a sink pad into chunks of N bytes
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*
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* This class is for elements that receive buffers in an undesired size.
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* While for example raw video contains one image per buffer, the same is not
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@ -31,31 +30,55 @@
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* The theory of operation is like this: All buffers received are put
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* into the adapter using gst_adapter_push() and the data is then read back
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* in chunks of the desired size using gst_adapter_peek(). After the data is
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* processed, it is freed using gst_adapter_flush(). An example function that
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* needs to process data in 10 byte chunks could look like this:
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* processed, it is freed using gst_adapter_flush().
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*
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* For example, a sink pad's chain function that needs to pass data to a library
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* in 512-byte chunks could be implemented like this:
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* <programlisting>
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* void
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* process_buffer (GstAdapter *adapter, GstBuffer *buffer)
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* static GstFlowReturn
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* sink_pad_chain (GstPad *pad, GstBuffer *buffer)
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* {
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* guint8 *data;
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* MyElement *this;
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* GstAdapter *adapter;
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* GstFlowReturn ret = GST_FLOW_OK;
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*
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* // will give the element an extra ref; remember to drop it
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* this = MY_ELEMENT (gst_pad_get_parent (pad));
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* adapter = this->adapter;
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*
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* // put buffer into adapter
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* #gst_adapter_push (adapter, buffer);
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* // while we can read out 10 bytes, process them
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* while ((data = #gst_adapter_peek (adapter, 10))) {
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* // process the 10 bytes here
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* // after processing the data, flush it
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* #gst_adapter_flush (adapter, 10);
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* // while we can read out 512 bytes, process them
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* while (#gst_adapter_available (adapter) >= 512 && fret == GST_FLOW_OK) {
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* // use flowreturn as an error value
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* ret = my_library_foo (#gst_adapter_peek (adapter, 512));
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* #gst_adapter_flush (adapter, 512);
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* }
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*
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* gst_object_unref (this);
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* return ret;
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* }
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* </programlisting>
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* For another example, a simple element inside GStreamer that uses GstAdapter
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* is the libvisual element.
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*
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* An element using GstAdapter in its sink pad chain function should ensure that
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* when the FLUSH_STOP event is received, that any queued data is cleared using
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* gst_adapter_clear(). Data should also be cleared or processed on EOS and
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* when changing state from #GST_STATE_PAUSED to #GST_STATE_READY.
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*
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* A last thing to note is that while GstAdapter is pretty optimized,
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* merging buffers still might be an operation that requires a memcpy()
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* operation, and this operation is not the fastest. Because of this, some
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* functions like gst_adapter_available_fast() are provided to help speed up
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* such cases should you want to.
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*
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* GstAdapter is not MT safe. All operations on an adapter must be serialized by
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* the caller. This is not normally a problem, however, as the normal use case
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* of GstAdapter is inside one pad's chain function, in which case access is
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* serialized via the pad's stream lock.
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*
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* Last reviewed on 2005-11-08 (0.9.5).
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*/
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#include <string.h>
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@ -70,13 +93,16 @@ GST_DEBUG_CATEGORY_STATIC (gst_adapter_debug);
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#define _do_init(thing) \
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GST_DEBUG_CATEGORY_INIT (gst_adapter_debug, "adapter", 0, "object to splice and merge buffers to desired size")
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GST_BOILERPLATE_FULL (GstAdapter, gst_adapter, GObject, G_TYPE_OBJECT, _do_init)
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GST_BOILERPLATE_FULL (GstAdapter, gst_adapter, GObject, G_TYPE_OBJECT,
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_do_init);
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static void gst_adapter_dispose (GObject * object);
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static void gst_adapter_finalize (GObject * object);
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static void gst_adapter_dispose (GObject * object);
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static void gst_adapter_finalize (GObject * object);
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static void gst_adapter_base_init (gpointer g_class)
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static void
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gst_adapter_base_init (gpointer g_class)
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{
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/* nop */
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}
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static void
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@ -130,9 +156,9 @@ gst_adapter_new (void)
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/**
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* gst_adapter_clear:
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* @adapter: the #GstAdapter to clear
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* @adapter: a #GstAdapter
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*
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* Removes all buffers from the @adapter.
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* Removes all buffers from @adapter.
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*/
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void
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gst_adapter_clear (GstAdapter * adapter)
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@ -168,13 +194,22 @@ gst_adapter_push (GstAdapter * adapter, GstBuffer * buf)
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/**
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* gst_adapter_peek:
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* @adapter: a #GstAdapter
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* @size: number of bytes to peek
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* @size: the number of bytes to peek
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*
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* Gets the first @size bytes stored in the @adapter. If this many bytes are
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* not available, it returns NULL. The returned pointer is valid until the next
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* function is called on the adapter.
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* Gets the first @size bytes stored in the @adapter. The returned pointer is
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* valid until the next function is called on the adapter.
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*
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* Returns: a pointer to the first @size bytes of data or NULL
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* Note that setting the returned pointer as the data of a #GstBuffer is
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* incorrect for general-purpose plugins. The reason is that if a downstream
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* element stores the buffer so that it has access to it outside of the bounds
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* of its chain function, the buffer will have an invalid data pointer after
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* your element flushes the bytes. In that case you should use
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* gst_adapter_take(), which returns a freshly-allocated buffer that you can set
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* as #GstBuffer malloc_data.
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*
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* Returns #NULL if @size bytes are not available.
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*
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* Returns: a pointer to the first @size bytes of data, or NULL.
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*/
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const guint8 *
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gst_adapter_peek (GstAdapter * adapter, guint size)
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@ -226,9 +261,11 @@ gst_adapter_peek (GstAdapter * adapter, guint size)
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/**
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* gst_adapter_flush:
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* @adapter: a #GstAdapter
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* @flush: number of bytes to flush
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* @flush: the number of bytes to flush
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*
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* Flushes the first @flush bytes of the @adapter.
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* Flushes the first @flush bytes out of @adapter.
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*
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* See also: gst_adapter_peek().
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*/
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void
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gst_adapter_flush (GstAdapter * adapter, guint flush)
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@ -260,12 +297,14 @@ gst_adapter_flush (GstAdapter * adapter, guint flush)
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/**
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* gst_adapter_take:
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* @adapter: a #GstAdapter
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* @nbytes: number of bytes to take
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* @nbytes: the number of bytes to take
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*
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* Returns a freshly allocated buffer containing the first @nbytes bytes of the
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* @adapter. g_free() the return value after use.
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* @adapter.
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*
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* Returns: oven-fresh hot data, or NULL if @nbytes bytes are not available
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* Caller owns returned value.
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*
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* Returns: oven-fresh hot data, or #NULL if @nbytes bytes are not available
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*/
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guint8 *
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gst_adapter_take (GstAdapter * adapter, guint nbytes)
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@ -299,7 +338,7 @@ gst_adapter_take (GstAdapter * adapter, guint nbytes)
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* value that can be supplied to gst_adapter_peek() without that function
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* returning NULL.
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*
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* Returns: amount of bytes available in @adapter
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* Returns: number of bytes available in @adapter
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*/
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guint
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gst_adapter_available (GstAdapter * adapter)
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@ -45,6 +45,7 @@ typedef struct _GstAdapterClass GstAdapterClass;
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struct _GstAdapter {
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GObject object;
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/*< private >*/
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GSList * buflist;
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guint size;
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guint skip;
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@ -54,7 +55,6 @@ struct _GstAdapter {
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guint assembled_size;
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guint assembled_len;
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/*< private >*/
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gpointer _gst_reserved[GST_PADDING];
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};
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