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#ifndef foopolyplibstreamhfoo
#define foopolyplibstreamhfoo
/* $Id$ */
/***
This file is part of polypaudio.
polypaudio is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published
by the Free Software Foundation; either version 2 of the License,
or (at your option) any later version.
polypaudio is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with polypaudio; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
USA.
***/
#include <sys/types.h>
#include <polyp/sample.h>
#include <polyp/channelmap.h>
#include <polyp/volume.h>
#include <polyp/polyplib-def.h>
#include <polyp/cdecl.h>
#include <polyp/polyplib-operation.h>
/** \file
* Audio streams for input, output and sample upload */
PA_C_DECL_BEGIN
/** \pa_stream
* An opaque stream for playback or recording */
typedef struct pa_stream pa_stream;
/** Create a new, unconnected stream with the specified name and sample type */
pa_stream* pa_stream_new(pa_context *c, const char *name, const pa_sample_spec *ss, const pa_channel_map *map);
/** Decrease the reference counter by one */
void pa_stream_unref(pa_stream *s);
/** Increase the reference counter by one */
pa_stream *pa_stream_ref(pa_stream *s);
/** Return the current state of the stream */
pa_stream_state_t pa_stream_get_state(pa_stream *p);
/** Return the context this stream is attached to */
pa_context* pa_stream_get_context(pa_stream *p);
/** Return the device (sink input or source output) index this stream is connected to */
uint32_t pa_stream_get_index(pa_stream *s);
/** Connect the stream to a sink */
void pa_stream_connect_playback(
pa_stream *s,
const char *dev,
const pa_buffer_attr *attr,
pa_stream_flags_t flags,
pa_cvolume *volume);
/** Connect the stream to a source */
void pa_stream_connect_record(
pa_stream *s,
const char *dev,
const pa_buffer_attr *attr,
pa_stream_flags_t flags);
/** Disconnect a stream from a source/sink */
void pa_stream_disconnect(pa_stream *s);
/** Write some data to the server (for playback sinks), if free_cb is
* non-NULL this routine is called when all data has been written out
* and an internal reference to the specified data is kept, the data
* is not copied. If NULL, the data is copied into an internal
* buffer. */
void pa_stream_write(pa_stream *p /**< The stream to use */,
const void *data /**< The data to write */,
size_t length /**< The length of the data to write */,
void (*free_cb)(void *p) /**< A cleanup routine for the data or NULL to request an internal copy */,
size_t delta /**< Drop this many
bytes in the playback
buffer before writing
this data. Use
(size_t) -1 for
clearing the whole
playback
buffer. Normally you
will specify 0 here,
i.e. append to the
playback buffer. If
the value given here
is greater than the
buffered data length
the buffer is cleared
and the data is
written to the
buffer's start. This
value is ignored on
upload streams. */);
/** Return the amount of bytes that may be written using pa_stream_write() */
size_t pa_stream_writable_size(pa_stream *p);
/** Drain a playback stream */
pa_operation* pa_stream_drain(pa_stream *s, void (*cb) (pa_stream*s, int success, void *userdata), void *userdata);
/** Get the playback latency of a stream */
pa_operation* pa_stream_get_latency_info(pa_stream *p, void (*cb)(pa_stream *p, const pa_latency_info *i, void *userdata), void *userdata);
/** Set the callback function that is called whenever the state of the stream changes */
void pa_stream_set_state_callback(pa_stream *s, void (*cb)(pa_stream *s, void *userdata), void *userdata);
/** Set the callback function that is called when new data may be
* written to the stream. */
void pa_stream_set_write_callback(pa_stream *p, void (*cb)(pa_stream *p, size_t length, void *userdata), void *userdata);
/** Set the callback function that is called when new data is available from the stream */
void pa_stream_set_read_callback(pa_stream *p, void (*cb)(pa_stream *p, const void*data, size_t length, void *userdata), void *userdata);
/** Pause (or resume) playback of this stream temporarily. Available on both playback and recording streams. \since 0.3 */
pa_operation* pa_stream_cork(pa_stream *s, int b, void (*cb) (pa_stream*s, int success, void *userdata), void *userdata);
/** Flush the playback buffer of this stream. Most of the time you're
* better off using the parameter delta of pa_stream_write() instead of this
* function. Available on both playback and recording streams. \since 0.3 */
pa_operation* pa_stream_flush(pa_stream *s, void (*cb)(pa_stream *s, int success, void *userdata), void *userdata);
/** Reenable prebuffering. Available for playback streams only. \since 0.6 */
pa_operation* pa_stream_prebuf(pa_stream *s, void (*cb)(pa_stream *s, int success, void *userdata), void *userdata);
/** Request immediate start of playback on this stream. This disables
* prebuffering as specified in the pa_buffer_attr structure. Available for playback streams only. \since
* 0.3 */
pa_operation* pa_stream_trigger(pa_stream *s, void (*cb)(pa_stream *s, int success, void *userdata), void *userdata);
/** Rename the stream. \since 0.5 */
pa_operation* pa_stream_set_name(pa_stream *s, const char *name, void(*cb)(pa_stream*c, int success, void *userdata), void *userdata);
/** Return the total number of bytes written to/read from the
* stream. This counter is not reset on pa_stream_flush(), you may do
* this yourself using pa_stream_reset_counter(). \since 0.6 */
uint64_t pa_stream_get_counter(pa_stream *s);
/** Return the current playback/recording time. This is based on the
* counter accessible with pa_stream_get_counter(). This function
* requires a pa_latency_info structure as argument, which should be
* acquired using pa_stream_get_latency(). \since 0.6 */
pa_usec_t pa_stream_get_time(pa_stream *s, const pa_latency_info *i);
/** Return the total stream latency. Thus function requires a
* pa_latency_info structure as argument, which should be aquired
* using pa_stream_get_latency(). In case the stream is a monitoring
* stream the result can be negative, i.e. the captured samples are
* not yet played. In this case *negative is set to 1. \since 0.6 */
pa_usec_t pa_stream_get_latency(pa_stream *s, const pa_latency_info *i, int *negative);
/** Return the interpolated playback/recording time. Requires the
* PA_STREAM_INTERPOLATE_LATENCY bit set when creating the stream. In
* contrast to pa_stream_get_latency() this function doesn't require
* a whole roundtrip for response. \since 0.6 */
pa_usec_t pa_stream_get_interpolated_time(pa_stream *s);
/** Return the interpolated playback/recording latency. Requires the
* PA_STREAM_INTERPOLATE_LATENCY bit set when creating the
* stream. \since 0.6 */
pa_usec_t pa_stream_get_interpolated_latency(pa_stream *s, int *negative);
/** Return a pointer to the streams sample specification. \since 0.6 */
const pa_sample_spec* pa_stream_get_sample_spec(pa_stream *s);
PA_C_DECL_END
#endif
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