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gst/elements/gstfilesink.c (gst_file_sink_start)

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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 2005-11-09 09:48:16 +00:00
parent 2d000e0460
commit 0ae7675f7e
5 changed files with 140 additions and 60 deletions
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2
ChangeLog
View file

@ -1,5 +1,7 @@
2005-11-09 Andy Wingo <wingo@pobox.com> 2005-11-09 Andy Wingo <wingo@pobox.com>
* gst/base/gstadapter.c: More adapter docs.
* gst/elements/gstfilesink.c (gst_file_sink_start) * gst/elements/gstfilesink.c (gst_file_sink_start)
(gst_file_sink_stop): New functions, replace the state change (gst_file_sink_stop): New functions, replace the state change
handler. handler.

97
gst/base/gstadapter.c
View file

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

2
gst/base/gstadapter.h
View file

@ -45,6 +45,7 @@ typedef struct _GstAdapterClass GstAdapterClass;
struct _GstAdapter { struct _GstAdapter {
GObject object; GObject object;
/*< private >*/
GSList * buflist; GSList * buflist;
guint size; guint size;
guint skip; guint skip;
@ -54,7 +55,6 @@ struct _GstAdapter {
guint assembled_size; guint assembled_size;
guint assembled_len; guint assembled_len;
/*< private >*/
gpointer _gst_reserved[GST_PADDING]; gpointer _gst_reserved[GST_PADDING];
}; };

97
libs/gst/base/gstadapter.c
View file

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

2
libs/gst/base/gstadapter.h
View file

@ -45,6 +45,7 @@ typedef struct _GstAdapterClass GstAdapterClass;
struct _GstAdapter { struct _GstAdapter {
GObject object; GObject object;
/*< private >*/
GSList * buflist; GSList * buflist;
guint size; guint size;
guint skip; guint skip;
@ -54,7 +55,6 @@ struct _GstAdapter {
guint assembled_size; guint assembled_size;
guint assembled_len; guint assembled_len;
/*< private >*/
gpointer _gst_reserved[GST_PADDING]; gpointer _gst_reserved[GST_PADDING];
}; };