mirror of
https://github.com/libretro/RetroArch.git
synced 2024-12-02 21:37:14 +00:00
324 lines
8.2 KiB
C
324 lines
8.2 KiB
C
/* RetroArch - A frontend for libretro.
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* Copyright (C) 2010-2014 - Hans-Kristian Arntzen
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*
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* RetroArch is free software: you can redistribute it and/or modify it under the terms
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* of the GNU General Public License as published by the Free Software Found-
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* ation, either version 3 of the License, or (at your option) any later version.
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*
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* RetroArch is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
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* without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
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* PURPOSE. See the GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along with RetroArch.
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* If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "driver.h"
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#include "general.h"
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#include <pulse/pulseaudio.h>
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#include <boolean.h>
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#include <string.h>
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#include <stdint.h>
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typedef struct
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{
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pa_threaded_mainloop *mainloop;
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pa_context *context;
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pa_stream *stream;
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size_t buffer_size;
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bool nonblock;
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bool success;
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bool is_paused;
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} pa_t;
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static void pulse_free(void *data)
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{
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pa_t *pa = (pa_t*)data;
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if (pa)
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{
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if (pa->mainloop)
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pa_threaded_mainloop_stop(pa->mainloop);
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if (pa->stream)
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{
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pa_stream_disconnect(pa->stream);
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pa_stream_unref(pa->stream);
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}
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if (pa->context)
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{
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pa_context_disconnect(pa->context);
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pa_context_unref(pa->context);
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}
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if (pa->mainloop)
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pa_threaded_mainloop_free(pa->mainloop);
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free(pa);
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}
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}
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static void stream_success_cb(pa_stream *s, int success, void *data)
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{
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(void)s;
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pa_t *pa = (pa_t*)data;
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pa->success = success;
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pa_threaded_mainloop_signal(pa->mainloop, 0);
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}
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static void context_state_cb(pa_context *c, void *data)
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{
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pa_t *pa = (pa_t*)data;
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switch (pa_context_get_state(c))
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{
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case PA_CONTEXT_READY:
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case PA_CONTEXT_TERMINATED:
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case PA_CONTEXT_FAILED:
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pa_threaded_mainloop_signal(pa->mainloop, 0);
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break;
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default:
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break;
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}
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}
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static void stream_state_cb(pa_stream *s, void *data)
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{
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pa_t *pa = (pa_t*)data;
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switch (pa_stream_get_state(s))
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{
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case PA_STREAM_READY:
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case PA_STREAM_FAILED:
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case PA_STREAM_TERMINATED:
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pa_threaded_mainloop_signal(pa->mainloop, 0);
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break;
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default:
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break;
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}
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}
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static void stream_request_cb(pa_stream *s, size_t length, void *data)
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{
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(void)length;
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(void)s;
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pa_t *pa = (pa_t*)data;
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pa_threaded_mainloop_signal(pa->mainloop, 0);
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}
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static void stream_latency_update_cb(pa_stream *s, void *data)
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{
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(void)s;
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pa_t *pa = (pa_t*)data;
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pa_threaded_mainloop_signal(pa->mainloop, 0);
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}
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static void underrun_update_cb(pa_stream *s, void *data)
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{
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(void)s;
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pa_t *pa = (pa_t*)data;
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RARCH_LOG("[PulseAudio]: Underrun (Buffer: %u, Writable size: %u).\n",
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(unsigned)pa->buffer_size,
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(unsigned)pa_stream_writable_size(pa->stream));
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}
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static void buffer_attr_cb(pa_stream *s, void *data)
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{
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pa_t *pa = (pa_t*)data;
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const pa_buffer_attr *server_attr = pa_stream_get_buffer_attr(s);
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if (server_attr)
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pa->buffer_size = server_attr->tlength;
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RARCH_LOG("[PulseAudio]: Got new buffer size %u.\n", (unsigned)pa->buffer_size);
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}
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static void *pulse_init(const char *device, unsigned rate, unsigned latency)
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{
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const pa_buffer_attr *server_attr = NULL;
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pa_sample_spec spec;
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memset(&spec, 0, sizeof(spec));
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pa_buffer_attr buffer_attr = {0};
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pa_t *pa = (pa_t*)calloc(1, sizeof(*pa));
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if (!pa)
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goto error;
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pa->mainloop = pa_threaded_mainloop_new();
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if (!pa->mainloop)
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goto error;
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pa->context = pa_context_new(pa_threaded_mainloop_get_api(pa->mainloop), "RetroArch");
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if (!pa->context)
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goto error;
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pa_context_set_state_callback(pa->context, context_state_cb, pa);
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if (pa_context_connect(pa->context, device, PA_CONTEXT_NOFLAGS, NULL) < 0)
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goto error;
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pa_threaded_mainloop_lock(pa->mainloop);
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if (pa_threaded_mainloop_start(pa->mainloop) < 0)
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goto error;
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pa_threaded_mainloop_wait(pa->mainloop);
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if (pa_context_get_state(pa->context) != PA_CONTEXT_READY)
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goto unlock_error;
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spec.format = is_little_endian() ? PA_SAMPLE_FLOAT32LE : PA_SAMPLE_FLOAT32BE;
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spec.channels = 2;
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spec.rate = rate;
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pa->stream = pa_stream_new(pa->context, "audio", &spec, NULL);
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if (!pa->stream)
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goto unlock_error;
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pa_stream_set_state_callback(pa->stream, stream_state_cb, pa);
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pa_stream_set_write_callback(pa->stream, stream_request_cb, pa);
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pa_stream_set_latency_update_callback(pa->stream, stream_latency_update_cb, pa);
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pa_stream_set_underflow_callback(pa->stream, underrun_update_cb, pa);
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pa_stream_set_buffer_attr_callback(pa->stream, buffer_attr_cb, pa);
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buffer_attr.maxlength = -1;
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buffer_attr.tlength = pa_usec_to_bytes(latency * PA_USEC_PER_MSEC, &spec);
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buffer_attr.prebuf = -1;
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buffer_attr.minreq = -1;
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buffer_attr.fragsize = -1;
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if (pa_stream_connect_playback(pa->stream, NULL, &buffer_attr, PA_STREAM_ADJUST_LATENCY, NULL, NULL) < 0)
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goto error;
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pa_threaded_mainloop_wait(pa->mainloop);
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if (pa_stream_get_state(pa->stream) != PA_STREAM_READY)
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goto unlock_error;
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server_attr = pa_stream_get_buffer_attr(pa->stream);
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if (server_attr)
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{
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pa->buffer_size = server_attr->tlength;
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RARCH_LOG("[PulseAudio]: Requested %u bytes buffer, got %u.\n",
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(unsigned)buffer_attr.tlength,
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(unsigned)pa->buffer_size);
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}
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else
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pa->buffer_size = buffer_attr.tlength;
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pa_threaded_mainloop_unlock(pa->mainloop);
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return pa;
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unlock_error:
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pa_threaded_mainloop_unlock(pa->mainloop);
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error:
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pulse_free(pa);
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return NULL;
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}
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static ssize_t pulse_write(void *data, const void *buf_, size_t size)
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{
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pa_t *pa = (pa_t*)data;
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const uint8_t *buf = (const uint8_t*)buf_;
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size_t written = 0;
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pa_threaded_mainloop_lock(pa->mainloop);
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while (size)
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{
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size_t writable = pa_stream_writable_size(pa->stream);
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writable = min(size, writable);
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if (writable)
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{
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pa_stream_write(pa->stream, buf, writable, NULL, 0, PA_SEEK_RELATIVE);
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buf += writable;
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size -= writable;
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written += writable;
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}
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else if (!pa->nonblock)
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pa_threaded_mainloop_wait(pa->mainloop);
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else
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break;
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}
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pa_threaded_mainloop_unlock(pa->mainloop);
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return written;
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}
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static bool pulse_stop(void *data)
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{
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RARCH_LOG("[PulseAudio]: Pausing.\n");
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pa_t *pa = (pa_t*)data;
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pa->success = true; // In case of spurious wakeup. Not critical.
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pa_threaded_mainloop_lock(pa->mainloop);
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pa_stream_cork(pa->stream, true, stream_success_cb, pa);
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pa_threaded_mainloop_wait(pa->mainloop);
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bool ret = pa->success;
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pa_threaded_mainloop_unlock(pa->mainloop);
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pa->is_paused = true;
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return ret;
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}
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static bool pulse_alive(void *data)
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{
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pa_t *pa = (pa_t*)data;
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if (pa)
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return !pa->is_paused;
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return false;
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}
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static bool pulse_start(void *data)
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{
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RARCH_LOG("[PulseAudio]: Unpausing.\n");
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pa_t *pa = (pa_t*)data;
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pa->success = true; // In case of spurious wakeup. Not critical.
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pa_threaded_mainloop_lock(pa->mainloop);
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pa_stream_cork(pa->stream, false, stream_success_cb, pa);
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pa_threaded_mainloop_wait(pa->mainloop);
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bool ret = pa->success;
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pa_threaded_mainloop_unlock(pa->mainloop);
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pa->is_paused = false;
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return ret;
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}
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static void pulse_set_nonblock_state(void *data, bool state)
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{
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pa_t *pa = (pa_t*)data;
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pa->nonblock = state;
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}
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static bool pulse_use_float(void *data)
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{
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(void)data;
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return true;
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}
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static size_t pulse_write_avail(void *data)
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{
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pa_t *pa = (pa_t*)data;
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pa_threaded_mainloop_lock(pa->mainloop);
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size_t length = pa_stream_writable_size(pa->stream);
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g_extern.audio_data.driver_buffer_size = pa->buffer_size; // Can change spuriously.
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pa_threaded_mainloop_unlock(pa->mainloop);
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return length;
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}
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static size_t pulse_buffer_size(void *data)
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{
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pa_t *pa = (pa_t*)data;
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return pa->buffer_size;
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}
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audio_driver_t audio_pulse = {
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pulse_init,
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pulse_write,
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pulse_stop,
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pulse_start,
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pulse_alive,
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pulse_set_nonblock_state,
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pulse_free,
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pulse_use_float,
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"pulse",
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pulse_write_avail,
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pulse_buffer_size,
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};
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