Aegisub/aegisub/audio_player_pulse.cpp

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// Copyright (c) 2007, Niels Martin Hansen
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// * Redistributions of source code must retain the above copyright notice,
// this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above copyright notice,
// this list of conditions and the following disclaimer in the documentation
// and/or other materials provided with the distribution.
// * Neither the name of the Aegisub Group nor the names of its contributors
// may be used to endorse or promote products derived from this software
// without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
// POSSIBILITY OF SUCH DAMAGE.
//
// -----------------------------------------------------------------------------
//
// AEGISUB
//
// Website: http://aegisub.cellosoft.com
// Contact: mailto:jiifurusu@gmail.com
//
///////////
// Headers
#include <wx/wxprec.h>
#include <stdio.h>
#include "audio_player.h"
#include "audio_provider.h"
#include "utils.h"
#include "options.h"
#include <pulse/pulseaudio.h>
//////////////
// Prototypes
class PulseAudioPlayer;
//////////////////////
// Pulse Audio player
class PulseAudioPlayer : public AudioPlayer {
private:
float volume;
bool open;
bool is_playing;
// Audio data info
volatile unsigned long start_frame;
volatile unsigned long cur_frame;
volatile unsigned long end_frame;
unsigned long bpf; // bytes per frame
// Used for synchronising with async events
wxSemaphore context_notify;
wxSemaphore context_success;
volatile int context_success_val;
wxSemaphore stream_notify;
wxSemaphore stream_success;
volatile int stream_success_val;
// PulseAudio data
pa_threaded_mainloop *mainloop; // pulseaudio mainloop handle
pa_context *context; // connection context
volatile pa_context_state_t cstate;
pa_stream *stream;
volatile pa_stream_state_t sstate;
volatile pa_usec_t play_start_time; // timestamp when playback was started
int paerror;
// Called by PA to notify about contetxt operation completion
static void pa_context_success(pa_context *c, int success, PulseAudioPlayer *thread);
// Called by PA to notify about other context-related stuff
static void pa_context_notify(pa_context *c, PulseAudioPlayer *thread);
// Called by PA when a stream operation completes
static void pa_stream_success(pa_stream *p, int success, PulseAudioPlayer *thread);
// Called by PA to request more data written to stream
static void pa_stream_write(pa_stream *p, size_t length, PulseAudioPlayer *thread);
// Called by PA to notify about other stream-related stuff
static void pa_stream_notify(pa_stream *p, PulseAudioPlayer *thread);
public:
PulseAudioPlayer();
~PulseAudioPlayer();
void OpenStream();
void CloseStream();
void Play(long long start,long long count);
void Stop(bool timerToo=true);
bool IsPlaying();
long long GetStartPosition();
long long GetEndPosition();
long long GetCurrentPosition();
void SetEndPosition(long long pos);
void SetCurrentPosition(long long pos);
void SetVolume(double vol) { volume = vol; }
double GetVolume() { return volume; }
};
///////////
// Factory
class PulseAudioPlayerFactory : public AudioPlayerFactory {
public:
AudioPlayer *CreatePlayer() { return new PulseAudioPlayer(); }
PulseAudioPlayerFactory() : AudioPlayerFactory(_T("pulse")) {}
} registerPulsePlayer;
///////////////
// Constructor
PulseAudioPlayer::PulseAudioPlayer()
: context_notify(0, 1)
, context_success(0, 1)
, stream_notify(0, 1)
, stream_success(0, 1)
{
volume = 1.0f;
paerror = 0;
open = false;
is_playing = false;
}
//////////////
// Destructor
PulseAudioPlayer::~PulseAudioPlayer()
{
if (open) CloseStream();
}
///////////////
// Open stream
void PulseAudioPlayer::OpenStream()
{
//printf("Opening PulseAudio stream\n");
if (open) CloseStream();
// Get provider
AudioProvider *provider = GetProvider();
// Initialise a mainloop
//printf("Initialising threaded main loop\n");
mainloop = pa_threaded_mainloop_new();
if (!mainloop) {
throw _T("Failed to initialise PulseAudio threaded mainloop object");
}
//printf("Starting main loop\n");
pa_threaded_mainloop_start(mainloop);
// Create context
//printf("Creating context\n");
context = pa_context_new(pa_threaded_mainloop_get_api(mainloop), "Aegisub");
if (!context) {
pa_threaded_mainloop_free(mainloop);
throw _T("Failed to create PulseAudio context");
}
pa_context_set_state_callback(context, (pa_context_notify_cb_t)pa_context_notify, this);
// Connect the context
//printf("Connecting context\n");
pa_context_connect(context, NULL, 0, NULL);
// Wait for connection
while (true) {
context_notify.Wait();
if (cstate == PA_CONTEXT_READY) {
break;
} else if (cstate == PA_CONTEXT_FAILED) {
// eww
paerror = pa_context_errno(context);
pa_context_unref(context);
pa_threaded_mainloop_stop(mainloop);
pa_threaded_mainloop_free(mainloop);
wxString s(pa_strerror(paerror), wxConvUTF8);
s.Prepend(_T("PulseAudio reported error: "));
throw s.c_str();
}
// otherwise loop once more
}
//printf("Context connected\n");
// Set up stream
bpf = provider->GetChannels() * provider->GetBytesPerSample();
pa_sample_spec ss;
ss.format = PA_SAMPLE_S16LE; // FIXME
ss.rate = provider->GetSampleRate();
ss.channels = provider->GetChannels();
pa_channel_map map;
pa_channel_map_init_auto(&map, ss.channels, PA_CHANNEL_MAP_DEFAULT);
//printf("Creating stream\n");
stream = pa_stream_new(context, "Sound", &ss, &map);
if (!stream) {
// argh!
pa_context_disconnect(context);
pa_context_unref(context);
pa_threaded_mainloop_stop(mainloop);
pa_threaded_mainloop_free(mainloop);
throw _T("PulseAudio could not create stream");
}
pa_stream_set_state_callback(stream, (pa_stream_notify_cb_t)pa_stream_notify, this);
pa_stream_set_write_callback(stream, (pa_stream_request_cb_t)pa_stream_write, this);
// Connect stream
//printf("Connecting playback stream\n");
paerror = pa_stream_connect_playback(stream, NULL, NULL, PA_STREAM_INTERPOLATE_TIMING|PA_STREAM_NOT_MONOTONOUS|PA_STREAM_AUTO_TIMING_UPDATE, NULL, NULL);
if (paerror) {
printf("PulseAudio reported error: %s (%d)\n", pa_strerror(paerror), paerror);
wxString s(pa_strerror(paerror), wxConvUTF8);
s.Prepend(_T("PulseAudio reported error: "));
throw s.c_str();
}
while (true) {
stream_notify.Wait();
if (sstate == PA_STREAM_READY) {
break;
} else if (sstate == PA_STREAM_FAILED) {
paerror = pa_context_errno(context);
printf("PulseAudio player: Stream connection failed: %s (%d)\n", pa_strerror(paerror), paerror);
throw _T("PulseAudio player: Something went wrong connecting the stream");
}
}
//printf("Connected playback stream, now playing\n\n");
// Hopefully this marks success
//printf("Finished opening PulseAudio\n\n");
open = true;
}
////////////////
// Close stream
void PulseAudioPlayer::CloseStream()
{
if (!open) return;
//printf("Closing PuseAudio\n");
if (is_playing) Stop();
// Hope for the best and just do things as quickly as possible
pa_stream_disconnect(stream);
pa_stream_unref(stream);
pa_context_disconnect(context);
pa_context_unref(context);
pa_threaded_mainloop_stop(mainloop);
pa_threaded_mainloop_free(mainloop);
//printf("Closed PulseAudio\n");
open = false;
}
////////
// Play
void PulseAudioPlayer::Play(long long start,long long count)
{
//printf("Starting PulseAudio playback\n");
if (!open) OpenStream();
if (is_playing) {
// If we're already playing, do a quick "reset"
is_playing = false;
pa_threaded_mainloop_lock(mainloop);
pa_operation *op = pa_stream_flush(stream, (pa_stream_success_cb_t)pa_stream_success, this);
pa_threaded_mainloop_unlock(mainloop);
stream_success.Wait();
pa_operation_unref(op);
if (!stream_success_val) {
paerror = pa_context_errno(context);
printf("PulseAudio player: Error flushing stream: %s (%d)\n", pa_strerror(paerror), paerror);
}
}
start_frame = start;
cur_frame = start;
end_frame = start + count;
//printf("start=%lu end=%lu\n", start_frame, end_frame);
is_playing = true;
play_start_time = 0;
pa_threaded_mainloop_lock(mainloop);
paerror = pa_stream_get_time(stream, &play_start_time);
pa_threaded_mainloop_unlock(mainloop);
if (paerror) {
printf("PulseAudio player: Error getting stream time: %s (%d)\n", pa_strerror(paerror), paerror);
}
PulseAudioPlayer::pa_stream_write(stream, pa_stream_writable_size(stream), this);
pa_threaded_mainloop_lock(mainloop);
pa_operation *op = pa_stream_trigger(stream, (pa_stream_success_cb_t)pa_stream_success, this);
pa_threaded_mainloop_unlock(mainloop);
stream_success.Wait();
pa_operation_unref(op);
if (!stream_success_val) {
paerror = pa_context_errno(context);
printf("PulseAudio player: Error triggering stream: %s (%d)\n", pa_strerror(paerror), paerror);
}
// Update timer
if (displayTimer && !displayTimer->IsRunning()) displayTimer->Start(15);
}
////////
// Stop
void PulseAudioPlayer::Stop(bool timerToo)
{
if (!is_playing) return;
//printf("Stopping PulseAudio\n");
is_playing = false;
start_frame = 0;
cur_frame = 0;
end_frame = 0;
// Flush the stream of data
//printf("Flushing stream\n");
pa_threaded_mainloop_lock(mainloop);
pa_operation *op = pa_stream_flush(stream, (pa_stream_success_cb_t)pa_stream_success, this);
pa_threaded_mainloop_unlock(mainloop);
stream_success.Wait();
pa_operation_unref(op);
if (!stream_success_val) {
paerror = pa_context_errno(context);
printf("PulseAudio player: Error flushing stream: %s (%d)\n", pa_strerror(paerror), paerror);
}
// And unref it
//printf("Stopped stream\n\n");
if (timerToo && displayTimer) {
displayTimer->Stop();
}
}
bool PulseAudioPlayer::IsPlaying()
{
return is_playing;
}
///////////
// Set end
void PulseAudioPlayer::SetEndPosition(long long pos)
{
end_frame = pos;
}
////////////////////////
// Set current position
void PulseAudioPlayer::SetCurrentPosition(long long pos)
{
cur_frame = pos;
}
long long PulseAudioPlayer::GetStartPosition()
{
return start_frame;
}
long long PulseAudioPlayer::GetEndPosition()
{
return end_frame;
}
////////////////////////
// Get current position
long long PulseAudioPlayer::GetCurrentPosition()
{
if (!is_playing) return 0;
// FIXME: this should be based on not duration played but actual sample being heard
// (during vidoeo playback, cur_frame might get changed to resync)
// Calculation duration we have played, in microseconds
pa_usec_t play_cur_time;
pa_stream_get_time(stream, &play_cur_time);
pa_usec_t playtime = play_cur_time - play_start_time;
return start_frame + playtime * provider->GetSampleRate() / (1000*1000);
}
// Called by PA to notify about contetxt operation completion
void PulseAudioPlayer::pa_context_success(pa_context *c, int success, PulseAudioPlayer *thread)
{
thread->context_success_val = success;
thread->context_success.Post();
}
// Called by PA to notify about other context-related stuff
void PulseAudioPlayer::pa_context_notify(pa_context *c, PulseAudioPlayer *thread)
{
thread->cstate = pa_context_get_state(thread->context);
thread->context_notify.Post();
}
// Called by PA when an operation completes
void PulseAudioPlayer::pa_stream_success(pa_stream *p, int success, PulseAudioPlayer *thread)
{
thread->stream_success_val = success;
thread->stream_success.Post();
}
// Called by PA to request more data (and other things?)
void PulseAudioPlayer::pa_stream_write(pa_stream *p, size_t length, PulseAudioPlayer *thread)
{
if (!thread->is_playing) return;
if (thread->cur_frame >= thread->end_frame + thread->provider->GetSampleRate()) {
// More than a second past end of stream
thread->is_playing = false;
pa_operation *op = pa_stream_drain(p, NULL, NULL);
pa_operation_unref(op);
//printf("PA requested more buffer, but no more to stream\n");
return;
} else if (thread->cur_frame >= thread->end_frame) {
// Past end of stream, but not a full second, add some silence
void *buf = calloc(length, 1);
::pa_stream_write(p, buf, length, free, 0, PA_SEEK_RELATIVE);
thread->cur_frame += length / thread->bpf;
return;
}
//printf("PA requested more buffer, %lu bytes\n", (unsigned long)length);
unsigned long bpf = thread->bpf;
unsigned long frames = length / thread->bpf;
unsigned long maxframes = thread->end_frame - thread->cur_frame;
if (frames > maxframes) frames = maxframes;
//printf("Handing it %lu frames\n", frames);
void *buf = malloc(frames * bpf);
thread->provider->GetAudioWithVolume(buf, thread->cur_frame, frames, thread->volume);
::pa_stream_write(p, buf, frames*bpf, free, 0, PA_SEEK_RELATIVE);
thread->cur_frame += frames;
}
// Called by PA to notify about other stuff
void PulseAudioPlayer::pa_stream_notify(pa_stream *p, PulseAudioPlayer *thread)
{
thread->sstate = pa_stream_get_state(thread->stream);
thread->stream_notify.Post();
}