source: roaraudio/libroarpulse/stream.c @ 3428:44989588ad5a

//stream.c:

/*
 *      Copyright (C) Philipp 'ph3-der-loewe' Schafft - 2010
 *  The code (may) include prototypes and comments (and maybe
 *  other code fragements) from libpulse*. They are mostly copyrighted by:
 *  Lennart Poettering <poettering@users.sourceforge.net> and
 *  Pierre Ossman <drzeus@drzeus.cx>
 *
 *  This file is part of libroarpulse a part of RoarAudio,
 *  a cross-platform sound system for both, home and professional use.
 *  See README for details.
 *
 *  This file is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License version 3
 *  as published by the Free Software Foundation.
 *
 *  RoarAudio 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 General Public License
 *  along with this software; see the file COPYING.  If not, write to
 *  the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 *  NOTE for everyone want's to change something and send patches:
 *  read README and HACKING! There a addition information on
 *  the license of this document you need to read before you send
 *  any patches.
 *
 *  NOTE for uses of non-GPL (LGPL,...) software using libesd, libartsc
 *  or libpulse*:
 *  The libs libroaresd, libroararts and libroarpulse link this libroar
 *  and are therefore GPL. Because of this it may be illigal to use
 *  them with any software that uses libesd, libartsc or libpulse*.
 */

#include <libroarpulse/libroarpulse.h>

struct _roar_pa_stream_cb {
 union {
  pa_stream_notify_cb_t  ncb;
  pa_stream_request_cb_t rcb;
  pa_stream_success_cb_t scb;
 } cb;
 void * userdata;
};

struct pa_stream {
 size_t refc;
 pa_context * c;
 struct roar_vio_calls vio;
 struct roar_stream stream;
 pa_stream_state_t state;
 pa_sample_spec    sspec;
 struct {
  struct _roar_pa_stream_cb change_state;
 } cb;
};

typedef void pa_proplist;
void pa_stream_set_state(pa_stream *s, pa_stream_state_t st);

pa_stream* pa_stream_new_with_proplist(
        pa_context *c                     ,
        const char *name                  ,
        const pa_sample_spec *ss          ,
        const pa_channel_map *map         ,
        pa_proplist *p                    );

/** Create a new, unconnected stream with the specified name and sample type */
pa_stream* pa_stream_new(
        pa_context *c                     /**< The context to create this stream in */,
        const char *name                  /**< A name for this stream */,
        const pa_sample_spec *ss          /**< The desired sample format */,
        const pa_channel_map *map         /**< The desired channel map, or NULL for default */) {
 return pa_stream_new_with_proplist(c, name, ss, map, NULL);
}

pa_stream* pa_stream_new_with_proplist(
        pa_context *c                     ,
        const char *name                  ,
        const pa_sample_spec *ss          ,
        const pa_channel_map *map         ,
        pa_proplist *p                    ) {
 pa_stream * s;

 if ( p != NULL )
  return NULL;

 if ( (s = roar_mm_malloc(sizeof(pa_stream))) == NULL )
  return NULL;

 memset(s, 0, sizeof(pa_stream));

 memcpy(&(s->sspec), ss, sizeof(pa_sample_spec));

 if ( roar_pa_sspec2auinfo(&(s->stream.info), ss) == -1 ) {
  roar_mm_free(s);
  return NULL;
 }

 s->state = PA_STREAM_UNCONNECTED;
 s->c     = c;
 pa_context_ref(c);

 return s;
}

static void _pa_stream_free(pa_stream * s) {
 pa_stream_disconnect(s);
 pa_context_unref(s->c);
 roar_mm_free(s);
}

/** Decrease the reference counter by one */
void pa_stream_unref(pa_stream *s) {
 if ( s == NULL )
  return;

 s->refc--;

 if (s->refc < 1 )
  _pa_stream_free(s);
}

/** Increase the reference counter by one */
pa_stream *pa_stream_ref(pa_stream *s) {
 if ( s == NULL )
  return NULL;

 s->refc++;

 return s;
}

/** Return the current state of the stream */
pa_stream_state_t pa_stream_get_state(pa_stream *p) {
 if ( p == NULL )
  return PA_STREAM_FAILED;

 return p->state;
}

/** Return the context this stream is attached to */
pa_context* pa_stream_get_context(pa_stream *p) {
 if ( p == NULL )
  return NULL;

 return p->c;
}

/** Return the device (sink input or source output) index this stream is connected to */
uint32_t pa_stream_get_index(pa_stream *s) {
 return 0;
}

/** Connect the stream to a sink */
int pa_stream_connect_playback(
        pa_stream *s                  /**< The stream to connect to a sink */,
        const char *dev               /**< Name of the sink to connect to, or NULL for default */ ,
        const pa_buffer_attr *attr    /**< Buffering attributes, or NULL for default */,
        pa_stream_flags_t flags       /**< Additional flags, or 0 for default */,
        pa_cvolume *volume            /**< Initial volume, or NULL for default */,
        pa_stream *sync_stream        /**< Synchronize this stream with the specified one, or NULL for a standalone stream*/);

/** Connect the stream to a source */
int pa_stream_connect_record(
        pa_stream *s                  /**< The stream to connect to a source */ ,
        const char *dev               /**< Name of the source to connect to, or NULL for default */,
        const pa_buffer_attr *attr    /**< Buffer attributes, or NULL for default */,
        pa_stream_flags_t flags       /**< Additional flags, or 0 for default */);

/** Disconnect a stream from a source/sink */
int pa_stream_disconnect(pa_stream *s) {
 if ( s == NULL )
  return -1;

 if ( s->state != PA_STREAM_READY )
  return -1;

 roar_vio_close(&(s->vio));

 pa_stream_set_state(s, PA_STREAM_TERMINATED);

 return 0;
}

/** 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. The client my freely seek around in the output buffer. For
 * most applications passing 0 and PA_SEEK_RELATIVE as arguments for
 * offset and seek should be useful.*/
int 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 */,
        pa_free_cb_t free_cb     /**< A cleanup routine for the data or NULL to request an internal copy */,
        int64_t offset,          /**< Offset for seeking, must be 0 for upload streams */
        pa_seek_mode_t seek      /**< Seek mode, must be PA_SEEK_RELATIVE for upload streams */);

/** Read the next fragment from the buffer (for recording).
 * data will point to the actual data and length will contain the size
 * of the data in bytes (which can be less than a complete framgnet).
 * Use pa_stream_drop() to actually remove the data from the
 * buffer. If no data is available will return a NULL pointer  \since 0.8 */
int pa_stream_peek(
        pa_stream *p                 /**< The stream to use */,
        const void **data            /**< Pointer to pointer that will point to data */,
        size_t *length              /**< The length of the data read */);

/** Remove the current fragment on record streams. It is invalid to do this without first
 * calling pa_stream_peek(). \since 0.8 */
int pa_stream_drop(pa_stream *p);

/** Return the nember of bytes that may be written using pa_stream_write() */
size_t pa_stream_writable_size(pa_stream *p);

/** Return the number of bytes that may be read using pa_stream_read() \since 0.8 */
size_t pa_stream_readable_size(pa_stream *p);

/** Drain a playback stream. Use this for notification when the buffer is empty */
pa_operation* pa_stream_drain(pa_stream *s, pa_stream_success_cb_t cb, void *userdata);

/** Request a timing info structure update for a stream. Use
 * pa_stream_get_timing_info() to get access to the raw timing data,
 * or pa_stream_get_time() or pa_stream_get_latency() to get cleaned
 * up values. */
pa_operation* pa_stream_update_timing_info(pa_stream *p, pa_stream_success_cb_t cb, 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, pa_stream_notify_cb_t cb, void *userdata) {
 if ( s == NULL )
  return;

 s->cb.change_state.cb.ncb    = cb;
 s->cb.change_state.userdata  = userdata;
}

void pa_stream_set_state(pa_stream *s, pa_stream_state_t st) {
 if ( s == NULL )
  return;

 s->state = st;

 if ( s->cb.change_state.cb.ncb == NULL ) {
  s->cb.change_state.cb.ncb(s, s->cb.change_state.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, pa_stream_request_cb_t cb, void *userdata);

/** Set the callback function that is called when new data is available from the stream.
 * Return the number of bytes read. \since 0.8 */
void pa_stream_set_read_callback(pa_stream *p, pa_stream_request_cb_t cb, void *userdata);

/** Set the callback function that is called when a buffer overflow happens. (Only for playback streams) \since 0.8 */
void pa_stream_set_overflow_callback(pa_stream *p, pa_stream_notify_cb_t cb, void *userdata);

/** Set the callback function that is called when a buffer underflow happens. (Only for playback streams) \since 0.8 */
void pa_stream_set_underflow_callback(pa_stream *p, pa_stream_notify_cb_t cb, void *userdata);

/** Set the callback function that is called whenever a latency information update happens. Useful on PA_STREAM_AUTO_TIMING_UPDATE streams only. (Only for playback streams) \since 0.8.2 */
void pa_stream_set_latency_update_callback(pa_stream *p, pa_stream_notify_cb_t cb, 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, pa_stream_success_cb_t cb, 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, pa_stream_success_cb_t cb, void *userdata);
/** Reenable prebuffering as specified in the pa_buffer_attr
 * structure. Available for playback streams only. \since 0.6 */
pa_operation* pa_stream_prebuf(pa_stream *s, pa_stream_success_cb_t cb, void *userdata);

/** Request immediate start of playback on this stream. This disables
 * prebuffering as specified in the pa_buffer_attr
 * structure, temporarily. Available for playback streams only. \since 0.3 */
pa_operation* pa_stream_trigger(pa_stream *s, pa_stream_success_cb_t cb, void *userdata);

/** Rename the stream. \since 0.5 */
pa_operation* pa_stream_set_name(pa_stream *s, const char *name, pa_stream_success_cb_t cb, void *userdata);

/** Return the current playback/recording time. This is based on the
 * data in the timing info structure returned by
 * pa_stream_get_timing_info(). This function will usually only return
 * new data if a timing info update has been recieved. Only if timing
 * interpolation has been requested (PA_STREAM_INTERPOLATE_TIMING)
 * the data from the last timing update is used for an estimation of
 * the current playback/recording time based on the local time that
 * passed since the timing info structure has been acquired. The time
 * value returned by this function is guaranteed to increase
 * monotonically. (that means: the returned value is always greater or
 * equal to the value returned on the last call) This behaviour can
 * be disabled by using PA_STREAM_NOT_MONOTONOUS. This may be
 * desirable to deal better with bad estimations of transport
 * latencies, but may have strange effects if the application is not
 * able to deal with time going 'backwards'. \since 0.6 */
int pa_stream_get_time(pa_stream *s, pa_usec_t *r_usec);

/** Return the total stream latency. This function is based on
 * pa_stream_get_time(). 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 */
int pa_stream_get_latency(pa_stream *s, pa_usec_t *r_usec, int *negative);

/** Return the latest raw timing data structure. The returned pointer
 * points to an internal read-only instance of the timing
 * structure. The user should make a copy of this structure if he
 * wants to modify it. An in-place update to this data structure may
 * be requested using pa_stream_update_timing_info(). If no
 * pa_stream_update_timing_info() call was issued before, this
 * function will fail with PA_ERR_NODATA. Please note that the
 * write_index member field (and only this field) is updated on each
 * pa_stream_write() call, not just when a timing update has been
 * recieved. \since 0.8 */
const pa_timing_info* pa_stream_get_timing_info(pa_stream *s);

/** Return a pointer to the stream's sample specification. \since 0.6 */
const pa_sample_spec* pa_stream_get_sample_spec(pa_stream *s) {
 if ( s == NULL )
  return NULL;

 return &(s->sspec);
}

/** Return a pointer to the stream's channel map. \since 0.8 */
const pa_channel_map* pa_stream_get_channel_map(pa_stream *s);

/** Return the buffer metrics of the stream. Only valid after the
 * stream has been connected successfuly and if the server is at least
 * PulseAudio 0.9. \since 0.9.0 */
const pa_buffer_attr* pa_stream_get_buffer_attr(pa_stream *s);

//ll