add VipsStreamou
An output stream subclass you can easily connect to other destinations.
This commit is contained in:
parent
6423721951
commit
91b0703921
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@ -273,7 +273,9 @@ VipsStreamiu *vips_streamiu_new( void );
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(G_TYPE_INSTANCE_GET_CLASS( (obj), \
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(G_TYPE_INSTANCE_GET_CLASS( (obj), \
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VIPS_TYPE_STREAMO, VipsStreamoClass ))
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VIPS_TYPE_STREAMO, VipsStreamoClass ))
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#define VIPS_STREAMO_BUFFER_SIZE (4096)
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/* PNG writes in 8kb chunks, so we need to be a little larger than that.
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*/
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#define VIPS_STREAMO_BUFFER_SIZE (8500)
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/* Output to something like a socket, pipe or memory area.
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/* Output to something like a socket, pipe or memory area.
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*/
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*/
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@ -282,13 +284,17 @@ typedef struct _VipsStreamo {
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/*< private >*/
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/*< private >*/
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/* This stream should write to memory.
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*/
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gboolean memory;
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/* The stream has been finished and can no longer be written.
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/* The stream has been finished and can no longer be written.
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*/
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*/
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gboolean finished;
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gboolean finished;
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/* Write memory output here.
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/* Write memory output here.
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*/
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*/
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GByteArray *memory;
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GByteArray *memory_buffer;
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/* And return memory via this blob.
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/* And return memory via this blob.
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*/
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*/
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@ -337,6 +343,45 @@ int vips_streamo_writef( VipsStreamo *streamo, const char *fmt, ... )
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__attribute__((format(printf, 2, 3)));
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__attribute__((format(printf, 2, 3)));
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int vips_streamo_write_amp( VipsStreamo *streamo, const char *str );
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int vips_streamo_write_amp( VipsStreamo *streamo, const char *str );
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#define VIPS_TYPE_STREAMOU (vips_streamou_get_type())
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#define VIPS_STREAMOU( obj ) \
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(G_TYPE_CHECK_INSTANCE_CAST( (obj), \
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VIPS_TYPE_STREAMOU, VipsStreamou ))
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#define VIPS_STREAMOU_CLASS( klass ) \
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(G_TYPE_CHECK_CLASS_CAST( (klass), \
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VIPS_TYPE_STREAMOU, VipsStreamouClass))
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#define VIPS_IS_STREAMOU( obj ) \
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(G_TYPE_CHECK_INSTANCE_TYPE( (obj), VIPS_TYPE_STREAMOU ))
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#define VIPS_IS_STREAMOU_CLASS( klass ) \
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(G_TYPE_CHECK_CLASS_TYPE( (klass), VIPS_TYPE_STREAMOU ))
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#define VIPS_STREAMOU_GET_CLASS( obj ) \
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(G_TYPE_INSTANCE_GET_CLASS( (obj), \
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VIPS_TYPE_STREAMOU, VipsStreamouClass ))
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#define VIPS_STREAMOU_BUFFER_SIZE (4096)
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/* Output to something like a socket, pipe or memory area.
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*/
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typedef struct _VipsStreamou {
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VipsStreamo parent_object;
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} VipsStreamou;
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typedef struct _VipsStreamouClass {
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VipsStreamoClass parent_class;
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/* The action signals clients can use to implement write and finish.
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* We must use gint64 everywhere since there's no G_TYPE_SIZE.
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*/
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gint64 (*write)( VipsStreamou *, const void *, gint64 );
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void (*finish)( VipsStreamou * );
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} VipsStreamouClass;
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GType vips_streamou_get_type( void );
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VipsStreamou *vips_streamou_new( void );
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#ifdef __cplusplus
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#ifdef __cplusplus
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}
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}
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#endif /*__cplusplus*/
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#endif /*__cplusplus*/
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@ -5,6 +5,7 @@ libiofuncs_la_SOURCES = \
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streami.c \
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streami.c \
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streamiu.c \
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streamiu.c \
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streamo.c \
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streamo.c \
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streamou.c \
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bufis.c \
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bufis.c \
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dbuf.c \
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dbuf.c \
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reorder.c \
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reorder.c \
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@ -333,6 +333,7 @@ vips_init( const char *argv0 )
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extern GType vips_streami_get_type( void );
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extern GType vips_streami_get_type( void );
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extern GType vips_streamiu_get_type( void );
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extern GType vips_streamiu_get_type( void );
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extern GType vips_streamo_get_type( void );
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extern GType vips_streamo_get_type( void );
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extern GType vips_streamou_get_type( void );
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static gboolean started = FALSE;
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static gboolean started = FALSE;
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static gboolean done = FALSE;
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static gboolean done = FALSE;
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@ -450,6 +451,7 @@ vips_init( const char *argv0 )
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(void) vips_streami_get_type();
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(void) vips_streami_get_type();
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(void) vips_streamiu_get_type();
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(void) vips_streamiu_get_type();
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(void) vips_streamo_get_type();
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(void) vips_streamo_get_type();
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(void) vips_streamou_get_type();
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vips__meta_init_types();
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vips__meta_init_types();
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vips__interpolate_init();
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vips__interpolate_init();
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im__format_init();
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im__format_init();
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@ -1,4 +1,4 @@
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/* A Streamiu subclass with signals you can easily hook up to other input
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/* A Streami subclass with signals you can easily hook up to other input
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* sources.
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* sources.
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*
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*
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* J.Cupitt, 21/11/19
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* J.Cupitt, 21/11/19
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@ -31,11 +31,6 @@
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*/
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*/
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/* TODO
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*
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* - can we map and then close the fd? how about on Windows?
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*/
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/*
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/*
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#define VIPS_DEBUG
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#define VIPS_DEBUG
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*/
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*/
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@ -77,9 +72,9 @@ static guint vips_streamiu_signals[SIG_LAST] = { 0 };
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static ssize_t
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static ssize_t
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vips_streamiu_read_real( VipsStreami *streami,
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vips_streamiu_read_real( VipsStreami *streami,
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void *data, size_t length )
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void *buffer, size_t length )
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{
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{
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ssize_t bytes_read;
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gint64 bytes_read;
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VIPS_DEBUG_MSG( "vips_streamiu_read_real:\n" );
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VIPS_DEBUG_MSG( "vips_streamiu_read_real:\n" );
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@ -88,7 +83,7 @@ vips_streamiu_read_real( VipsStreami *streami,
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bytes_read = 0;
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bytes_read = 0;
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g_signal_emit( streami, vips_streamiu_signals[SIG_READ], 0,
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g_signal_emit( streami, vips_streamiu_signals[SIG_READ], 0,
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data, length, &bytes_read );
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buffer, length, &bytes_read );
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VIPS_DEBUG_MSG( " %zd\n", bytes_read );
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VIPS_DEBUG_MSG( " %zd\n", bytes_read );
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@ -151,13 +146,12 @@ vips_streamiu_class_init( VipsStreamiuClass *class )
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/**
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/**
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* VipsStreamiu::read:
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* VipsStreamiu::read:
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* @streamiu: the stream being operated on
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* @streamiu: the stream being operated on
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* @buffer: %gint64, seek offset
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* @buffer: %gpointer, buffer to fill
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* @size: %gint, seek origin
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* @size: %gint64, size of buffer
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*
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*
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* This signal is emitted to seek the stream. The handler should
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* This signal is emitted to read bytes from the source into @buffer.
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* change the stream position appropriately.
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*
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*
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* Returns: the new seek position.
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* Returns: the number of bytes read.
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*/
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*/
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vips_streamiu_signals[SIG_READ] = g_signal_new( "read",
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vips_streamiu_signals[SIG_READ] = g_signal_new( "read",
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G_TYPE_FROM_CLASS( class ),
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G_TYPE_FROM_CLASS( class ),
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@ -31,12 +31,6 @@
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*/
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*/
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/* TODO
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*
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* - test we can really change all behaviour in the subclass ... add callbacks
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* as well to make it simpler for language bindings
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*/
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/*
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/*
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#define VIPS_DEBUG
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#define VIPS_DEBUG
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*/
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*/
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@ -93,7 +87,7 @@ vips_streamo_finalize( GObject *gobject )
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VIPS_DEBUG_MSG( "vips_streamo_finalize:\n" );
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VIPS_DEBUG_MSG( "vips_streamo_finalize:\n" );
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VIPS_FREEF( g_byte_array_unref, streamo->memory );
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VIPS_FREEF( g_byte_array_unref, streamo->memory_buffer );
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if( streamo->blob ) {
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if( streamo->blob ) {
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vips_area_unref( VIPS_AREA( streamo->blob ) );
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vips_area_unref( VIPS_AREA( streamo->blob ) );
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streamo->blob = NULL;
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streamo->blob = NULL;
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@ -120,7 +114,7 @@ vips_streamo_build( VipsObject *object )
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return( -1 );
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return( -1 );
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}
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}
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if( vips_object_argument_isset( object, "filename" ) ) {
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if( stream->filename ) {
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const char *filename = stream->filename;
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const char *filename = stream->filename;
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int fd;
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int fd;
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@ -141,8 +135,8 @@ vips_streamo_build( VipsObject *object )
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stream->descriptor = dup( stream->descriptor );
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stream->descriptor = dup( stream->descriptor );
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stream->close_descriptor = stream->descriptor;
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stream->close_descriptor = stream->descriptor;
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}
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}
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else {
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else if( streamo->memory ) {
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streamo->memory = g_byte_array_new();
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streamo->memory_buffer = g_byte_array_new();
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}
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}
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return( 0 );
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return( 0 );
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@ -182,10 +176,17 @@ vips_streamo_class_init( VipsStreamoClass *class )
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class->write = vips_streamo_write_real;
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class->write = vips_streamo_write_real;
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class->finish = vips_streamo_finish_real;
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class->finish = vips_streamo_finish_real;
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VIPS_ARG_BOOL( class, "memory", 3,
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_( "Memory" ),
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_( "File descriptor should output to memory" ),
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VIPS_ARGUMENT_OPTIONAL_INPUT,
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G_STRUCT_OFFSET( VipsStreamo, memory ),
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FALSE );
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/* SET_ALWAYS means that blob is set by C and the obj system is not
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/* SET_ALWAYS means that blob is set by C and the obj system is not
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* involved in creation or destruction. It can be read at any time.
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* involved in creation or destruction. It can be read at any time.
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*/
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*/
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VIPS_ARG_BOXED( class, "blob", 3,
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VIPS_ARG_BOXED( class, "blob", 4,
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_( "Blob" ),
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_( "Blob" ),
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_( "Blob to save to" ),
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_( "Blob to save to" ),
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VIPS_ARGUMENT_SET_ALWAYS,
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VIPS_ARGUMENT_SET_ALWAYS,
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@ -277,7 +278,9 @@ vips_streamo_new_to_memory( void )
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VIPS_DEBUG_MSG( "vips_streamo_new_to_memory:\n" );
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VIPS_DEBUG_MSG( "vips_streamo_new_to_memory:\n" );
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streamo = VIPS_STREAMO( g_object_new( VIPS_TYPE_STREAMO, NULL ) );
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streamo = VIPS_STREAMO( g_object_new( VIPS_TYPE_STREAMO,
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"memory", TRUE,
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NULL ) );
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if( vips_object_build( VIPS_OBJECT( streamo ) ) ) {
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if( vips_object_build( VIPS_OBJECT( streamo ) ) ) {
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VIPS_UNREF( streamo );
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VIPS_UNREF( streamo );
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@ -293,11 +296,13 @@ vips_streamo_write_unbuffered( VipsStreamo *streamo,
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{
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{
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VipsStreamoClass *class = VIPS_STREAMO_GET_CLASS( streamo );
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VipsStreamoClass *class = VIPS_STREAMO_GET_CLASS( streamo );
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VIPS_DEBUG_MSG( "vips_streamo_write_unbuffered:\n" );
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if( streamo->finished )
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if( streamo->finished )
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return( 0 );
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return( 0 );
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if( streamo->memory )
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if( streamo->memory_buffer )
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g_byte_array_append( streamo->memory, data, length );
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g_byte_array_append( streamo->memory_buffer, data, length );
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else
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else
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while( length > 0 ) {
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while( length > 0 ) {
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ssize_t n;
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ssize_t n;
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@ -328,6 +333,8 @@ vips_streamo_flush( VipsStreamo *streamo )
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g_assert( streamo->write_point >= 0 );
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g_assert( streamo->write_point >= 0 );
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g_assert( streamo->write_point <= VIPS_STREAMO_BUFFER_SIZE );
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g_assert( streamo->write_point <= VIPS_STREAMO_BUFFER_SIZE );
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VIPS_DEBUG_MSG( "vips_streamo_flush:\n" );
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if( streamo->write_point > 0 ) {
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if( streamo->write_point > 0 ) {
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if( vips_streamo_write_unbuffered( streamo,
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if( vips_streamo_write_unbuffered( streamo,
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streamo->output_buffer, streamo->write_point ) )
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streamo->output_buffer, streamo->write_point ) )
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@ -397,13 +404,13 @@ vips_streamo_finish( VipsStreamo *streamo )
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/* Move the stream buffer into the blob so it can be read out.
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/* Move the stream buffer into the blob so it can be read out.
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*/
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*/
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if( streamo->memory ) {
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if( streamo->memory_buffer ) {
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unsigned char *data;
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unsigned char *data;
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size_t length;
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size_t length;
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length = streamo->memory->len;
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length = streamo->memory_buffer->len;
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data = g_byte_array_free( streamo->memory, FALSE );
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data = g_byte_array_free( streamo->memory_buffer, FALSE );
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streamo->memory = NULL;
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streamo->memory_buffer = NULL;
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vips_blob_set( streamo->blob,
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vips_blob_set( streamo->blob,
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(VipsCallbackFn) g_free, data, length );
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(VipsCallbackFn) g_free, data, length );
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}
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}
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@ -436,22 +443,22 @@ vips_streamo_steal( VipsStreamo *streamo, size_t *length )
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(void) vips_streamo_flush( streamo );
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(void) vips_streamo_flush( streamo );
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if( !streamo->memory ||
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if( !streamo->memory_buffer ||
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streamo->finished ) {
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streamo->finished ) {
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if( length )
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if( length )
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*length = streamo->memory->len;
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*length = streamo->memory_buffer->len;
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return( NULL );
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return( NULL );
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}
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}
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if( length )
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if( length )
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*length = streamo->memory->len;
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*length = streamo->memory_buffer->len;
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data = g_byte_array_free( streamo->memory, FALSE );
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data = g_byte_array_free( streamo->memory_buffer, FALSE );
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streamo->memory = NULL;
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streamo->memory_buffer = NULL;
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/* We must have a valid byte array or finish will fail.
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/* We must have a valid byte array or finish will fail.
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*/
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*/
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streamo->memory = g_byte_array_new();
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streamo->memory_buffer = g_byte_array_new();
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vips_streamo_finish( streamo );
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vips_streamo_finish( streamo );
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@ -0,0 +1,194 @@
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/* A Streamo subclass with signals you can easily hook up to other output
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* sources.
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*
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* J.Cupitt, 21/11/19
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*/
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/*
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This file is part of VIPS.
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VIPS is free software; you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301 USA
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*/
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/*
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These files are distributed with VIPS - http://www.vips.ecs.soton.ac.uk
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*/
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/*
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#define VIPS_DEBUG
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*/
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#ifdef HAVE_CONFIG_H
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||||||
|
#include <config.h>
|
||||||
|
#endif /*HAVE_CONFIG_H*/
|
||||||
|
#include <vips/intl.h>
|
||||||
|
|
||||||
|
#include <stdio.h>
|
||||||
|
#include <stdlib.h>
|
||||||
|
#ifdef HAVE_UNISTD_H
|
||||||
|
#include <unistd.h>
|
||||||
|
#endif /*HAVE_UNISTD_H*/
|
||||||
|
#include <string.h>
|
||||||
|
#include <errno.h>
|
||||||
|
#include <sys/types.h>
|
||||||
|
#include <sys/stat.h>
|
||||||
|
#include <fcntl.h>
|
||||||
|
#include <unistd.h>
|
||||||
|
|
||||||
|
#include <vips/vips.h>
|
||||||
|
#include <vips/internal.h>
|
||||||
|
#include <vips/debug.h>
|
||||||
|
|
||||||
|
#include "vipsmarshal.h"
|
||||||
|
|
||||||
|
G_DEFINE_TYPE( VipsStreamou, vips_streamou, VIPS_TYPE_STREAMO );
|
||||||
|
|
||||||
|
/* Our signals.
|
||||||
|
*/
|
||||||
|
enum {
|
||||||
|
SIG_WRITE,
|
||||||
|
SIG_FINISH,
|
||||||
|
SIG_LAST
|
||||||
|
};
|
||||||
|
|
||||||
|
static guint vips_streamou_signals[SIG_LAST] = { 0 };
|
||||||
|
|
||||||
|
static ssize_t
|
||||||
|
vips_streamou_write_real( VipsStreamo *streamo,
|
||||||
|
const void *data, size_t length )
|
||||||
|
{
|
||||||
|
gint64 bytes_written;
|
||||||
|
|
||||||
|
VIPS_DEBUG_MSG( "vips_streamou_write_real:\n" );
|
||||||
|
|
||||||
|
/* Return value if no attached handler.
|
||||||
|
*/
|
||||||
|
bytes_written = 0;
|
||||||
|
|
||||||
|
g_signal_emit( streamo, vips_streamou_signals[SIG_WRITE], 0,
|
||||||
|
data, length, &bytes_written );
|
||||||
|
|
||||||
|
VIPS_DEBUG_MSG( " %zd\n", bytes_written );
|
||||||
|
|
||||||
|
return( bytes_written );
|
||||||
|
}
|
||||||
|
|
||||||
|
static void
|
||||||
|
vips_streamou_finish_real( VipsStreamo *streamo )
|
||||||
|
{
|
||||||
|
VIPS_DEBUG_MSG( "vips_streamou_seek_real:\n" );
|
||||||
|
|
||||||
|
g_signal_emit( streamo, vips_streamou_signals[SIG_FINISH], 0 );
|
||||||
|
}
|
||||||
|
|
||||||
|
static gint64
|
||||||
|
vips_streamou_write_signal_real( VipsStreamou *streamou,
|
||||||
|
const void *data, gint64 length )
|
||||||
|
{
|
||||||
|
VIPS_DEBUG_MSG( "vips_streamou_write_signal_real:\n" );
|
||||||
|
|
||||||
|
return( 0 );
|
||||||
|
}
|
||||||
|
|
||||||
|
static void
|
||||||
|
vips_streamou_finish_signal_real( VipsStreamou *streamou )
|
||||||
|
{
|
||||||
|
VIPS_DEBUG_MSG( "vips_streamou_finish_signal_real:\n" );
|
||||||
|
}
|
||||||
|
|
||||||
|
static void
|
||||||
|
vips_streamou_class_init( VipsStreamouClass *class )
|
||||||
|
{
|
||||||
|
VipsObjectClass *object_class = VIPS_OBJECT_CLASS( class );
|
||||||
|
VipsStreamoClass *streamo_class = VIPS_STREAMO_CLASS( class );
|
||||||
|
|
||||||
|
object_class->nickname = "streamou";
|
||||||
|
object_class->description = _( "input stream" );
|
||||||
|
|
||||||
|
streamo_class->write = vips_streamou_write_real;
|
||||||
|
streamo_class->finish = vips_streamou_finish_real;
|
||||||
|
|
||||||
|
class->write = vips_streamou_write_signal_real;
|
||||||
|
class->finish = vips_streamou_finish_signal_real;
|
||||||
|
|
||||||
|
/**
|
||||||
|
* VipsStreamou::write:
|
||||||
|
* @streamou: the stream being operated on
|
||||||
|
* @data: %pointer, bytes to write
|
||||||
|
* @length: %gint64, number of bytes
|
||||||
|
*
|
||||||
|
* This signal is emitted to write bytes to the stream.
|
||||||
|
*
|
||||||
|
* Returns: the number of bytes written.
|
||||||
|
*/
|
||||||
|
vips_streamou_signals[SIG_WRITE] = g_signal_new( "write",
|
||||||
|
G_TYPE_FROM_CLASS( class ),
|
||||||
|
G_SIGNAL_ACTION,
|
||||||
|
G_STRUCT_OFFSET( VipsStreamouClass, write ),
|
||||||
|
NULL, NULL,
|
||||||
|
vips_INT64__POINTER_INT64,
|
||||||
|
G_TYPE_INT64, 2,
|
||||||
|
G_TYPE_POINTER, G_TYPE_INT64 );
|
||||||
|
|
||||||
|
/**
|
||||||
|
* VipsStreamou::finish:
|
||||||
|
* @streamou: the stream being operated on
|
||||||
|
*
|
||||||
|
* This signal is emitted at the end of write. The stream should do
|
||||||
|
* any finishing necessary.
|
||||||
|
*/
|
||||||
|
vips_streamou_signals[SIG_FINISH] = g_signal_new( "finish",
|
||||||
|
G_TYPE_FROM_CLASS( class ),
|
||||||
|
G_SIGNAL_ACTION,
|
||||||
|
G_STRUCT_OFFSET( VipsStreamouClass, finish ),
|
||||||
|
NULL, NULL,
|
||||||
|
g_cclosure_marshal_VOID__VOID,
|
||||||
|
G_TYPE_NONE, 0 );
|
||||||
|
|
||||||
|
}
|
||||||
|
|
||||||
|
static void
|
||||||
|
vips_streamou_init( VipsStreamou *streamou )
|
||||||
|
{
|
||||||
|
}
|
||||||
|
|
||||||
|
/**
|
||||||
|
* vips_streamou_new:
|
||||||
|
*
|
||||||
|
* Create a #VipsStreamou. Attach signals to implement write and finish.
|
||||||
|
*
|
||||||
|
* Returns: a new #VipsStreamou
|
||||||
|
*/
|
||||||
|
VipsStreamou *
|
||||||
|
vips_streamou_new( void )
|
||||||
|
{
|
||||||
|
VipsStreamou *streamou;
|
||||||
|
|
||||||
|
VIPS_DEBUG_MSG( "vips_streamou_new:\n" );
|
||||||
|
|
||||||
|
streamou = VIPS_STREAMOU( g_object_new( VIPS_TYPE_STREAMOU, NULL ) );
|
||||||
|
|
||||||
|
if( vips_object_build( VIPS_OBJECT( streamou ) ) ) {
|
||||||
|
VIPS_UNREF( streamou );
|
||||||
|
return( NULL );
|
||||||
|
}
|
||||||
|
|
||||||
|
return( streamou );
|
||||||
|
}
|
Loading…
Reference in New Issue