pulseaudio/src/pulsecore/source-output.h

#ifndef foopulsesourceoutputhfoo
#define foopulsesourceoutputhfoo

/***
  This file is part of PulseAudio.

  Copyright 2004-2006 Lennart Poettering

  PulseAudio 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.

  PulseAudio 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 PulseAudio; if not, write to the Free Software
  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  USA.
***/

#include <inttypes.h>

typedef struct pa_source_output pa_source_output;

#include <pulse/sample.h>
#include <pulsecore/source.h>
#include <pulsecore/memblockq.h>
#include <pulsecore/resampler.h>
#include <pulsecore/module.h>
#include <pulsecore/client.h>
#include <pulsecore/sink-input.h>

typedef enum pa_source_output_state {
    PA_SOURCE_OUTPUT_INIT,
    PA_SOURCE_OUTPUT_RUNNING,
    PA_SOURCE_OUTPUT_CORKED,
    PA_SOURCE_OUTPUT_UNLINKED
} pa_source_output_state_t;

static inline pa_bool_t PA_SOURCE_OUTPUT_IS_LINKED(pa_source_output_state_t x) {
    return x == PA_SOURCE_OUTPUT_RUNNING || x == PA_SOURCE_OUTPUT_CORKED;
}

typedef enum pa_source_output_flags {
    PA_SOURCE_OUTPUT_VARIABLE_RATE = 1,
    PA_SOURCE_OUTPUT_DONT_MOVE = 2,
    PA_SOURCE_OUTPUT_START_CORKED = 4,
    PA_SOURCE_OUTPUT_NO_REMAP = 8,
    PA_SOURCE_OUTPUT_NO_REMIX = 16,
    PA_SOURCE_OUTPUT_FIX_FORMAT = 32,
    PA_SOURCE_OUTPUT_FIX_RATE = 64,
    PA_SOURCE_OUTPUT_FIX_CHANNELS = 128,
    PA_SOURCE_OUTPUT_DONT_INHIBIT_AUTO_SUSPEND = 256
} pa_source_output_flags_t;

struct pa_source_output {
    pa_msgobject parent;

    uint32_t index;
    pa_core *core;

    pa_source_output_state_t state;
    pa_source_output_flags_t flags;

    char *driver;                         /* may be NULL */
    pa_proplist *proplist;

    pa_module *module;                    /* may be NULL */
    pa_client *client;                    /* may be NULL */

    pa_source *source; /* NULL while being moved */

    /* A source output can monitor just a single input of a sink, in which case we find it here */
    pa_sink_input *direct_on_input;       /* may be NULL */

    pa_sample_spec sample_spec;
    pa_channel_map channel_map;

    /* if TRUE then the source we are connected to is worth
     * remembering, i.e. was explicitly chosen by the user and not
     * automatically. module-stream-restore looks for this.*/
    pa_bool_t save_source:1;

    pa_resample_method_t requested_resample_method, actual_resample_method;

    /* Pushes a new memchunk into the output. Called from IO thread
     * context. */
    void (*push)(pa_source_output *o, const pa_memchunk *chunk); /* may NOT be NULL */

    /* Only relevant for monitor sources right now: called when the
     * recorded stream is rewound. Called from IO context */
    void (*process_rewind)(pa_source_output *o, size_t nbytes); /* may be NULL */

    /* Called whenever the maximum rewindable size of the source
     * changes. Called from IO thread context. */
    void (*update_max_rewind) (pa_source_output *o, size_t nbytes); /* may be NULL */

    /* Called whenever the configured latency of the source
     * changes. Called from IO context. */
    void (*update_source_requested_latency) (pa_source_output *o); /* may be NULL */

    /* Called whenver the latency range of the source changes. Called
     * from IO context. */
    void (*update_source_latency_range) (pa_source_output *o); /* may be NULL */

    /* If non-NULL this function is called when the output is first
     * connected to a source. Called from IO thread context */
    void (*attach) (pa_source_output *o);           /* may be NULL */

    /* If non-NULL this function is called when the output is
     * disconnected from its source. Called from IO thread context */
    void (*detach) (pa_source_output *o);           /* may be NULL */

    /* If non-NULL called whenever the the source this output is attached
     * to suspends or resumes. Called from main context */
    void (*suspend) (pa_source_output *o, pa_bool_t b);   /* may be NULL */

    /* If non-NULL called whenever the the source this output is attached
     * to changes. Called from main context */
    void (*moved) (pa_source_output *o);   /* may be NULL */

    /* Supposed to unlink and destroy this stream. Called from main
     * context. */
    void (*kill)(pa_source_output* o);              /* may NOT be NULL */

    /* Return the current latency (i.e. length of bufferd audio) of
    this stream. Called from main context. This is added to what the
    PA_SOURCE_OUTPUT_MESSAGE_GET_LATENCY message sent to the IO thread
    returns */
    pa_usec_t (*get_latency) (pa_source_output *o); /* may be NULL */

    /* If non-NULL this function is called from thread context if the
     * state changes. The old state is found in thread_info.state.  */
    void (*state_change) (pa_source_output *o, pa_source_output_state_t state); /* may be NULL */

    /* If non-NULL this function is called before this source output
     * is moved to a source and if it returns FALSE the move
     * will not be allowed */
    pa_bool_t (*may_move_to) (pa_source_output *o, pa_source *s); /* may be NULL */

    struct {
        pa_source_output_state_t state;

        pa_bool_t attached:1; /* True only between ->attach() and ->detach() calls */

        pa_sample_spec sample_spec;

        pa_resampler* resampler;              /* may be NULL */

        /* We maintain a delay memblockq here for source outputs that
         * don't implement rewind() */
        pa_memblockq *delay_memblockq;

        /* The requested latency for the source */
        pa_usec_t requested_source_latency;

        pa_sink_input *direct_on_input;       /* may be NULL */
    } thread_info;

    void *userdata;
};

PA_DECLARE_CLASS(pa_source_output);
#define PA_SOURCE_OUTPUT(o) pa_source_output_cast(o)

enum {
    PA_SOURCE_OUTPUT_MESSAGE_GET_LATENCY,
    PA_SOURCE_OUTPUT_MESSAGE_SET_RATE,
    PA_SOURCE_OUTPUT_MESSAGE_SET_STATE,
    PA_SOURCE_OUTPUT_MESSAGE_SET_REQUESTED_LATENCY,
    PA_SOURCE_OUTPUT_MESSAGE_GET_REQUESTED_LATENCY,
    PA_SOURCE_OUTPUT_MESSAGE_MAX
};

typedef struct pa_source_output_new_data {
    pa_proplist *proplist;
    pa_sink_input *direct_on_input;

    const char *driver;
    pa_module *module;
    pa_client *client;

    pa_source *source;

    pa_resample_method_t resample_method;

    pa_sample_spec sample_spec;
    pa_channel_map channel_map;

    pa_bool_t sample_spec_is_set:1;
    pa_bool_t channel_map_is_set:1;

    pa_bool_t save_source:1;
} pa_source_output_new_data;

pa_source_output_new_data* pa_source_output_new_data_init(pa_source_output_new_data *data);
void pa_source_output_new_data_set_sample_spec(pa_source_output_new_data *data, const pa_sample_spec *spec);
void pa_source_output_new_data_set_channel_map(pa_source_output_new_data *data, const pa_channel_map *map);
void pa_source_output_new_data_done(pa_source_output_new_data *data);

/* To be called by the implementing module only */

pa_source_output* pa_source_output_new(
        pa_core *core,
        pa_source_output_new_data *data,
        pa_source_output_flags_t flags);

void pa_source_output_put(pa_source_output *o);
void pa_source_output_unlink(pa_source_output*o);

void pa_source_output_set_name(pa_source_output *o, const char *name);

pa_usec_t pa_source_output_set_requested_latency(pa_source_output *o, pa_usec_t usec);

void pa_source_output_cork(pa_source_output *o, pa_bool_t b);

int pa_source_output_set_rate(pa_source_output *o, uint32_t rate);

/* Callable by everyone */

/* External code may request disconnection with this funcion */
void pa_source_output_kill(pa_source_output*o);

pa_usec_t pa_source_output_get_latency(pa_source_output *o, pa_usec_t *source_latency);

pa_bool_t pa_source_output_update_proplist(pa_source_output *o, pa_update_mode_t mode, pa_proplist *p);

pa_resample_method_t pa_source_output_get_resample_method(pa_source_output *o);

pa_bool_t pa_source_output_may_move(pa_source_output *o);
pa_bool_t pa_source_output_may_move_to(pa_source_output *o, pa_source *dest);
int pa_source_output_move_to(pa_source_output *o, pa_source *dest, pa_bool_t save);

/* The same as pa_source_output_move_to() but in two seperate steps,
 * first the detaching from the old source, then the attaching to the
 * new source */
int pa_source_output_start_move(pa_source_output *o);
int pa_source_output_finish_move(pa_source_output *o, pa_source *dest, pa_bool_t save);

#define pa_source_output_get_state(o) ((o)->state)

pa_usec_t pa_source_output_get_requested_latency(pa_source_output *o);

/* To be used exclusively by the source driver thread */

void pa_source_output_push(pa_source_output *o, const pa_memchunk *chunk);
void pa_source_output_process_rewind(pa_source_output *o, size_t nbytes);
void pa_source_output_update_max_rewind(pa_source_output *o, size_t nbytes);

void pa_source_output_set_state_within_thread(pa_source_output *o, pa_source_output_state_t state);

int pa_source_output_process_msg(pa_msgobject *mo, int code, void *userdata, int64_t offset, pa_memchunk *chunk);

pa_usec_t pa_source_output_set_requested_latency_within_thread(pa_source_output *o, pa_usec_t usec);

#endif