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63 lines
2.3 KiB
C
63 lines
2.3 KiB
C
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#ifndef foopulsesrbchannelhfoo
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#define foopulsesrbchannelhfoo
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/***
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This file is part of PulseAudio.
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Copyright 2014 David Henningsson, Canonical Ltd.
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PulseAudio 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
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published by the Free Software Foundation; either version 2.1 of the
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License, or (at your option) any later version.
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PulseAudio is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with PulseAudio; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
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USA.
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***/
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#include <pulse/mainloop-api.h>
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#include <pulsecore/fdsem.h>
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#include <pulsecore/memblock.h>
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/* An shm ringbuffer that is used for low overhead server-client communication.
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Signaling is done through eventfd semaphores (pa_fdsem). */
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typedef struct pa_srbchannel pa_srbchannel;
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typedef struct pa_srbchannel_template {
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int readfd, writefd;
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pa_memblock *memblock;
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} pa_srbchannel_template;
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pa_srbchannel* pa_srbchannel_new(pa_mainloop_api *m, pa_mempool *p);
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/* Note: this creates a srbchannel with swapped read and write. */
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pa_srbchannel* pa_srbchannel_new_from_template(pa_mainloop_api *m, pa_srbchannel_template *t);
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void pa_srbchannel_free(pa_srbchannel *sr);
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void pa_srbchannel_export(pa_srbchannel *sr, pa_srbchannel_template *t);
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size_t pa_srbchannel_write(pa_srbchannel *sr, const void *data, size_t l);
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size_t pa_srbchannel_read(pa_srbchannel *sr, void *data, size_t l);
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/* Set the callback function that is called whenever data becomes available for reading.
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It can also be called if the output buffer was full and can now be written to.
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Return false to abort all processing (e g if the srbchannel has been freed during the callback).
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Otherwise return true.
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Note that the callback will be called immediately, to be able to process stuff that
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might already be in the buffer.
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*/
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typedef bool (*pa_srbchannel_cb_t)(pa_srbchannel *sr, void *userdata);
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void pa_srbchannel_set_callback(pa_srbchannel *sr, pa_srbchannel_cb_t callback, void *userdata);
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#endif
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