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mpv/libao2/ao_polyp.c

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#include <assert.h>
#include <polyp/polyplib.h>
#include <polyp/polyplib-error.h>
#include <polyp/mainloop.h>
#include "audio_out.h"
#include "audio_out_internal.h"
#include "libaf/af_format.h"
#include "config.h"
#include "mp_msg.h"
#define POLYP_CLIENT_NAME "MPlayer"
/** General driver info */
static ao_info_t info = {
"Polypaudio audio output",
"polyp",
"Lennart Poettering",
""
};
/** The sink to connect to */
static char *sink = NULL;
/** Polypaudio playback stream object */
static struct pa_stream *stream = NULL;
/** Polypaudio connection context */
static struct pa_context *context = NULL;
/** Main event loop object */
static struct pa_mainloop *mainloop = NULL;
/** Some special libao macro magic */
LIBAO_EXTERN(polyp)
/** Wait until no further actions are pending on the connection context */
static void wait_for_completion(void) {
assert(context && mainloop);
while (pa_context_is_pending(context))
pa_mainloop_iterate(mainloop, 1, NULL);
}
/** Make sure that the connection context doesn't starve to death */
static void keep_alive(void) {
assert(context && mainloop);
while (pa_mainloop_iterate(mainloop, 0, NULL) > 0);
}
/** Wait until the specified operation completes */
static void wait_for_operation(struct pa_operation *o) {
assert(o && context && mainloop);
while (pa_operation_get_state(o) == PA_OPERATION_RUNNING)
pa_mainloop_iterate(mainloop, 1, NULL);
pa_operation_unref(o);
}
/** libao initialization function, arguments are sampling frequency,
* number of channels, sample type and some flags */
static int init(int rate_hz, int channels, int format, int flags) {
struct pa_sample_spec ss;
struct pa_buffer_attr a;
char hn[128];
char *host = NULL;
assert(!context && !stream && !mainloop);
if (ao_subdevice) {
int i = strcspn(ao_subdevice, ":");
if (i >= sizeof(hn))
i = sizeof(hn)-1;
if (i > 0) {
strncpy(host = hn, ao_subdevice, i);
hn[i] = 0;
}
if (ao_subdevice[i] == ':')
sink = ao_subdevice+i+1;
}
mp_msg(MSGT_AO, MSGL_ERR, "AO: [polyp] -%s-%s-\n", host, sink);
ss.channels = channels;
ss.rate = rate_hz;
switch (format) {
case AF_FORMAT_U8:
ss.format = PA_SAMPLE_U8;
break;
case AF_FORMAT_S16_LE:
ss.format = PA_SAMPLE_S16LE;
break;
case AF_FORMAT_S16_BE:
ss.format = PA_SAMPLE_S16BE;
break;
case AF_FORMAT_FLOAT_NE:
ss.format = PA_SAMPLE_FLOAT32;
break;
default:
mp_msg(MSGT_AO, MSGL_ERR, "AO: [polyp] Unsupported sample spec\n");
goto fail;
}
if (!pa_sample_spec_valid(&ss)) {
mp_msg(MSGT_AO, MSGL_ERR, "AO: [polyp] Invalid sample spec\n");
goto fail;
}
mainloop = pa_mainloop_new();
assert(mainloop);
context = pa_context_new(pa_mainloop_get_api(mainloop), POLYP_CLIENT_NAME);
assert(context);
pa_context_connect(context, host, 1, NULL);
wait_for_completion();
if (pa_context_get_state(context) != PA_CONTEXT_READY) {
mp_msg(MSGT_AO, MSGL_ERR, "AO: [polyp] Failed to connect to server: %s\n", pa_strerror(pa_context_errno(context)));
goto fail;
}
stream = pa_stream_new(context, "audio stream", &ss);
assert(stream);
a.maxlength = pa_bytes_per_second(&ss)*1;
a.tlength = a.maxlength*9/10;
a.prebuf = a.tlength/2;
a.minreq = a.tlength/10;
pa_stream_connect_playback(stream, sink, &a, PA_STREAM_INTERPOLATE_LATENCY, PA_VOLUME_NORM);
wait_for_completion();
if (pa_stream_get_state(stream) != PA_STREAM_READY) {
mp_msg(MSGT_AO, MSGL_ERR, "AO: [polyp] Failed to connect to server: %s\n", pa_strerror(pa_context_errno(context)));
goto fail;
}
return 1;
fail:
uninit(1);
return 0;
}
/** Destroy libao driver */
static void uninit(int immed) {
if (stream) {
if (!immed && pa_stream_get_state(stream) == PA_STREAM_READY)
wait_for_operation(pa_stream_drain(stream, NULL, NULL));
pa_stream_unref(stream);
stream = NULL;
}
if (context) {
pa_context_unref(context);
context = NULL;
}
if (mainloop) {
pa_mainloop_free(mainloop);
mainloop = NULL;
}
}
/** Play the specified data to the polypaudio server */
static int play(void* data, int len, int flags) {
assert(stream && context);
if (pa_stream_get_state(stream) != PA_STREAM_READY)
return -1;
if (!len)
wait_for_operation(pa_stream_trigger(stream, NULL, NULL));
else
pa_stream_write(stream, data, len, NULL, 0);
wait_for_completion();
if (pa_stream_get_state(stream) != PA_STREAM_READY)
return -1;
return len;
}
/** Pause the audio stream by corking it on the server */
static void audio_pause() {
assert(stream && context && pa_stream_get_state(stream) == PA_STREAM_READY);
wait_for_operation(pa_stream_cork(stream, 1, NULL, NULL));
}
/** Resume the audio stream by uncorking it on the server */
static void audio_resume() {
assert(stream && context && pa_stream_get_state(stream) == PA_STREAM_READY);
wait_for_operation(pa_stream_cork(stream, 0, NULL, NULL));
}
/** Reset the audio stream, i.e. flush the playback buffer on the server side */
static void reset() {
assert(stream && context && pa_stream_get_state(stream) == PA_STREAM_READY);
wait_for_operation(pa_stream_flush(stream, NULL, NULL));
}
/** Return number of bytes that may be written to the server without blocking */
static int get_space(void) {
uint32_t l;
assert(stream && context && pa_stream_get_state(stream) == PA_STREAM_READY);
keep_alive();
l = pa_stream_writable_size(stream);
return l;
}
/* A temporary latency variable */
/* static pa_usec_t latency = 0; */
/* static void latency_func(struct pa_stream *s, const struct pa_latency_info *l, void *userdata) { */
/* int negative = 0; */
/* if (!l) { */
/* mp_msg(MSGT_AO, MSGL_ERR, "AO: [polyp] Invalid sample spec: %s\n", pa_strerror(pa_context_errno(context))); */
/* return; */
/* } */
/* latency = pa_stream_get_latency(s, l, &negative); */
/* /\* Nor really required *\/ */
/* if (negative) */
/* latency = 0; */
/* } */
/** Return the current latency in seconds */
static float get_delay(void) {
assert(stream && context && pa_stream_get_state(stream) == PA_STREAM_READY);
pa_usec_t latency;
/* latency = 0; */
/* wait_for_operation(pa_stream_get_latency(stream, latency_func, NULL)); */
/* pa_operation_unref(pa_stream_get_latency(stream, latency_func, NULL)); */
latency = pa_stream_get_interpolated_latency(stream, NULL);
return (float) latency/1000000;
}
/** A temporary variable to store the current volume */
static pa_volume_t volume = PA_VOLUME_NORM;
/** A callback function that is called when the
* pa_context_get_sink_input_info() operation completes. Saves the
* volume field of the specified structure to the global variable volume. */
static void info_func(struct pa_context *c, const struct pa_sink_input_info *i, int is_last, void *userdata) {
if (is_last < 0) {
mp_msg(MSGT_AO, MSGL_ERR, "AO: [polyp] Failed to get sink input info: %s\n", pa_strerror(pa_context_errno(context)));
return;
}
if (!i)
return;
volume = i->volume;
}
/** Issue special libao controls on the device */
static int control(int cmd, void *arg) {
if (!context || !stream)
return CONTROL_ERROR;
switch (cmd) {
case AOCONTROL_SET_DEVICE:
/* Change the playback device */
sink = (char*)arg;
return CONTROL_OK;
case AOCONTROL_GET_DEVICE:
/* Return the playback device */
*(char**)arg = sink;
return CONTROL_OK;
case AOCONTROL_GET_VOLUME: {
/* Return the current volume of the playback stream */
ao_control_vol_t *vol = (ao_control_vol_t*) arg;
volume = PA_VOLUME_NORM;
wait_for_operation(pa_context_get_sink_input_info(context, pa_stream_get_index(stream), info_func, NULL));
vol->left = vol->right = (int) (pa_volume_to_user(volume)*100);
return CONTROL_OK;
}
case AOCONTROL_SET_VOLUME: {
/* Set the playback volume of the stream */
const ao_control_vol_t *vol = (ao_control_vol_t*) arg;
int v = vol->left;
if (vol->right > v)
v = vol->left;
wait_for_operation(pa_context_set_sink_input_volume(context, pa_stream_get_index(stream), pa_volume_from_user((double)v/100), NULL, NULL));
return CONTROL_OK;
}
default:
/* Unknown CONTROL command */
return CONTROL_UNKNOWN;
}
}
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