mirror of https://github.com/odrling/Aegisub
Merge rewritten ALSA player from 2.1.9. Closes #1106.
Not tested for compileability, and should probably also have printf's converted to logging statements. Originally committed to SVN as r5421.
This commit is contained in:
Niels Martin Hansen
parent
a98cfb7685
commit
9d1cdab638
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@ -1,4 +1,4 @@
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// Copyright (c) 2007, Niels Martin Hansen
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// Copyright (c) 2011, Niels Martin Hansen
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// All rights reserved.
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//
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// Redistribution and use in source and binary forms, with or without
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@ -41,365 +41,507 @@
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#include <libaegisub/log.h>
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#include "audio_player_alsa.h"
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#include "main.h"
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#include "compat.h"
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#include "frame_main.h"
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#include "utils.h"
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#include "options.h"
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#include <algorithm>
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/// @brief Constructor
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///
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AlsaPlayer::AlsaPlayer()
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class PthreadMutexLocker {
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pthread_mutex_t &mutex;
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PthreadMutexLocker(const PthreadMutexLocker &); // uncopyable
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PthreadMutexLocker(); // no default
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public:
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explicit PthreadMutexLocker(pthread_mutex_t &mutex) : mutex(mutex)
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{
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pthread_mutex_lock(&mutex);
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}
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~PthreadMutexLocker()
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{
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pthread_mutex_unlock(&mutex);
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}
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int WaitCondition(pthread_cond_t &cond)
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{
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return pthread_cond_wait(&cond, &mutex);
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}
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int WaitConditionTimeout(pthread_cond_t &cond, int ms)
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{
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timespec abstime;
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clock_gettime(CLOCK_REALTIME, &abstime);
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abstime.tv_nsec += ms * 1000000;
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return pthread_cond_timedwait(&cond, &mutex, &abstime);
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}
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};
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class ScopedAliveFlag {
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volatile bool &flag;
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ScopedAliveFlag(const ScopedAliveFlag &); // uncopyable
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ScopedAliveFlag(); // no default
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public:
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explicit ScopedAliveFlag(volatile bool &var) : flag(var) { flag = true; }
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~ScopedAliveFlag() { flag = false; }
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};
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struct PlaybackState {
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pthread_mutex_t mutex;
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pthread_cond_t cond;
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volatile bool playing;
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volatile bool alive;
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volatile bool signal_start;
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volatile bool signal_stop;
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volatile bool signal_close;
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volatile bool signal_volume;
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volatile double volume;
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volatile int64_t start_position;
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volatile int64_t end_position;
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AudioProvider *provider;
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std::string device_name;
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int64_t last_position;
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timespec last_position_time;
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PlaybackState()
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{
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pthread_mutex_init(&mutex, 0);
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pthread_cond_init(&cond, 0);
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Reset();
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volume = 1.0;
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}
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~PlaybackState()
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{
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pthread_cond_destroy(&cond);
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pthread_mutex_destroy(&mutex);
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}
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void Reset()
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{
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playing = false;
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alive = false;
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signal_start = false;
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signal_stop = false;
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signal_close = false;
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signal_volume = false;
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start_position = 0;
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end_position = 0;
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last_position = 0;
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provider = 0;
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}
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};
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class AlsaPlayer : public AudioPlayer {
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private:
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PlaybackState ps;
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pthread_t thread;
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bool open;
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public:
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AlsaPlayer();
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~AlsaPlayer();
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void OpenStream();
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void CloseStream();
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void Play(int64_t start, int64_t count);
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void Stop(bool timerToo=true);
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bool IsPlaying();
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int64_t GetStartPosition();
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int64_t GetEndPosition();
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int64_t GetCurrentPosition();
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void SetEndPosition(int64_t pos);
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void SetCurrentPosition(int64_t pos);
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void SetVolume(double vol);
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double GetVolume();
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};
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void *playback_thread(void *arg)
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{
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volume = 1.0f;
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open = false;
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playing = false;
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start_frame = cur_frame = end_frame = bpf = 0;
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provider = 0;
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// This is exception-free territory!
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// Return a pointer to a static string constant describing the error, or 0 on no error
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PlaybackState &ps = *(PlaybackState*)arg;
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PthreadMutexLocker ml(ps.mutex);
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ScopedAliveFlag alive_flag(ps.alive);
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snd_pcm_t *pcm = 0;
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if (snd_pcm_open(&pcm, ps.device_name.c_str(), SND_PCM_STREAM_PLAYBACK, 0) != 0)
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return "snd_pcm_open";
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printf("alsa_player: opened pcm\n");
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do_setup:
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snd_pcm_format_t pcm_format;
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switch (ps.provider->GetBytesPerSample())
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{
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case 1:
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printf("alsa_player: format U8\n");
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pcm_format = SND_PCM_FORMAT_U8;
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break;
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case 2:
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printf("alsa_player: format S16_LE\n");
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pcm_format = SND_PCM_FORMAT_S16_LE;
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break;
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default:
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snd_pcm_close(pcm);
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return "snd_pcm_format_t";
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}
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if (snd_pcm_set_params(pcm,
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pcm_format,
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SND_PCM_ACCESS_RW_INTERLEAVED,
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ps.provider->GetChannels(),
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ps.provider->GetSampleRate(),
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1, // allow resample
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100*1000 // 100 milliseconds latency
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) != 0)
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return "snd_pcm_set_params";
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printf("alsa_player: set pcm params\n");
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size_t framesize = ps.provider->GetChannels() * ps.provider->GetBytesPerSample();
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ps.signal_close = false;
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while (ps.signal_close == false)
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{
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// Wait for condition to trigger
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if (!ps.signal_start)
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ml.WaitCondition(ps.cond);
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printf("alsa_player: outer loop, condition happened\n");
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if (ps.signal_start == false || ps.end_position <= ps.start_position)
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{
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continue;
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}
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printf("alsa_player: starting playback\n");
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int64_t position = ps.start_position;
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// Playback position
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ps.last_position = position;
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clock_gettime(CLOCK_REALTIME, &ps.last_position_time);
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// Initial buffer-fill
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snd_pcm_sframes_t avail = std::min(snd_pcm_avail(pcm), (snd_pcm_sframes_t)(ps.end_position-position));
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char *buf = new char[avail*framesize];
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ps.provider->GetAudioWithVolume(buf, position, avail, ps.volume);
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snd_pcm_sframes_t written = 0;
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while (written <= 0)
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{
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written = snd_pcm_writei(pcm, buf, avail);
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if (written == -ESTRPIPE)
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{
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snd_pcm_recover(pcm, written, 0);
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}
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else if (written <= 0)
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{
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delete[] buf;
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snd_pcm_close(pcm);
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printf("alsa_player: error filling buffer\n");
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return "snd_pcm_writei";
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}
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}
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delete[] buf;
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position += written;
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// Start playback
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printf("alsa_player: initial buffer filled, hitting start\n");
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snd_pcm_start(pcm);
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ps.signal_start = false;
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ps.signal_stop = false;
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while (ps.signal_stop == false)
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{
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ScopedAliveFlag playing_flag(ps.playing);
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// Sleep a bit, or until an event
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ml.WaitConditionTimeout(ps.cond, 50);
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//printf("alsa_player: playback loop, out of wait\n");
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// Check for stop signal
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if (ps.signal_stop == true)
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{
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printf("alsa_player: playback loop, stop signal\n");
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snd_pcm_drop(pcm);
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break;
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}
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// Playback position
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snd_pcm_sframes_t delay;
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if (snd_pcm_delay(pcm, &delay) == 0)
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{
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ps.last_position = position - delay;
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clock_gettime(CLOCK_REALTIME, &ps.last_position_time);
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}
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// Fill buffer
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avail = std::min(snd_pcm_avail(pcm), (snd_pcm_sframes_t)(ps.end_position-position));
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buf = new char[avail*framesize];
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ps.provider->GetAudioWithVolume(buf, position, avail, ps.volume);
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written = 0;
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while (written <= 0)
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{
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written = snd_pcm_writei(pcm, buf, avail);
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if (written == -ESTRPIPE || written == -EPIPE)
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{
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snd_pcm_recover(pcm, written, 0);
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}
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else if (written == 0)
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{
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break;
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}
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else if (written < 0)
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{
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delete[] buf;
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snd_pcm_close(pcm);
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printf("alsa_player: error filling buffer, written=%d\n", written);
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return "snd_pcm_writei";
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}
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}
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delete[] buf;
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position += written;
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//printf("alsa_player: playback loop, filled buffer\n");
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// Check for end of playback
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if (position >= ps.end_position)
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{
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printf("alsa_player: playback loop, past end, draining\n");
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snd_pcm_drain(pcm);
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break;
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}
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}
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ps.signal_stop = false;
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printf("alsa_player: out of playback loop\n");
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switch (snd_pcm_state(pcm))
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{
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case SND_PCM_STATE_OPEN:
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// no clue what could have happened here, but start over
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ps.signal_start = false;
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ps.signal_stop = false;
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goto do_setup;
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case SND_PCM_STATE_SETUP:
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// we lost the preparedness?
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snd_pcm_prepare(pcm);
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break;
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case SND_PCM_STATE_DISCONNECTED:
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// lost device, close the handle and return error
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snd_pcm_close(pcm);
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return "SND_PCM_STATE_DISCONNECTED";
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default:
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// everything else should either be fine or impossible (here)
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break;
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}
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}
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ps.signal_close = false;
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printf("alsa_player: out of outer loop\n");
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snd_pcm_close(pcm);
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return 0;
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}
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/// @brief Destructor
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///
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AlsaPlayer::AlsaPlayer()
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{
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ps.Reset();
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open = false;
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}
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AlsaPlayer::~AlsaPlayer()
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{
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CloseStream();
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}
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/// @brief Open stream
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///
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void AlsaPlayer::OpenStream()
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{
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if (open) return;
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CloseStream();
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// Get provider
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provider = GetProvider();
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bpf = provider->GetChannels() * provider->GetBytesPerSample();
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ps.Reset();
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ps.provider = GetProvider();
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// We want playback
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stream = SND_PCM_STREAM_PLAYBACK;
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// And get a device name
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wxString device = lagi_wxString(OPT_GET("Player/Audio/ALSA/Device")->GetString());
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wxString device_name = lagi_wxString(OPT_GET("Player/Audio/ALSA/Device")->GetString());
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ps.device_name = std::string(device_name.utf8_str());
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// Open device for blocking access
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if (snd_pcm_open(&pcm_handle, device.mb_str(wxConvUTF8), stream, 0) < 0) { // supposedly we don't want SND_PCM_ASYNC even for async playback
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throw _T("ALSA player: Error opening specified PCM device");
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if (pthread_create(&thread, 0, &playback_thread, &ps) == 0)
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{
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open = true;
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}
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SetUpHardware();
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// Register async handler
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SetUpAsync();
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// Now ready
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open = true;
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}
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/// @brief DOCME
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///
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void AlsaPlayer::SetUpHardware()
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{
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int dir;
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// Allocate params structure
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snd_pcm_hw_params_t *hwparams;
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snd_pcm_hw_params_malloc(&hwparams);
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// Get hardware params
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if (snd_pcm_hw_params_any(pcm_handle, hwparams) < 0) {
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throw _T("ALSA player: Error setting up default PCM device");
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}
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// Set stream format
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if (snd_pcm_hw_params_set_access(pcm_handle, hwparams, SND_PCM_ACCESS_RW_INTERLEAVED) < 0) {
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throw _T("ALSA player: Could not set interleaved stream format");
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}
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// Set sample format
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switch (provider->GetBytesPerSample()) {
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case 1:
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sample_format = SND_PCM_FORMAT_S8;
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break;
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case 2:
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sample_format = SND_PCM_FORMAT_S16_LE;
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break;
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default:
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throw _T("ALSA player: Can only handle 8 and 16 bit sound");
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}
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if (snd_pcm_hw_params_set_format(pcm_handle, hwparams, sample_format) < 0) {
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throw _T("ALSA player: Could not set sample format");
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}
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// Ask for resampling
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if (snd_pcm_hw_params_set_rate_resample(pcm_handle, hwparams, 1) < 0) {
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throw _T("ALSA player: Couldn't enable resampling");
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}
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// Set sample rate
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rate = provider->GetSampleRate();
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real_rate = rate;
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if (snd_pcm_hw_params_set_rate_near(pcm_handle, hwparams, &real_rate, 0) < 0) {
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throw _T("ALSA player: Could not set sample rate");
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}
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LOG_D_IF(rate != real_rate, "player/audio/alsa") << "ALSA player: Could not set ideal sample rate " << rate << "using " << real_rate << "instead";
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// Set number of channels
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if (snd_pcm_hw_params_set_channels(pcm_handle, hwparams, provider->GetChannels()) < 0) {
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LOG_E("player/audio/alsa") << "Could not set number of channels";
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throw _T("ALSA player: Could not set number of channels");
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}
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printf("ALSA player: Set sample rate %u (wanted %u)\n", real_rate, rate);
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// Set buffer size
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unsigned int wanted_buflen = 1000000; // microseconds
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buflen = wanted_buflen;
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if (snd_pcm_hw_params_set_buffer_time_near(pcm_handle, hwparams, &buflen, &dir) < 0) {
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LOG_E("player/audio/alsa") << "Couldn't set buffer length";
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throw _T("ALSA player: Couldn't set buffer length");
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}
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LOG_D_IF(buflen != wanted_buflen, "player/audio/alsa") << "Couldn't get wanted buffer size of " << wanted_buflen << ", got " << buflen << "instead";
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if (snd_pcm_hw_params_get_buffer_size(hwparams, &bufsize) < 0) {
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LOG_E("player/audio/alsa") << "Couldn't get buffer size";
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throw _T("ALSA player: Couldn't get buffer size");
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}
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printf("ALSA player: Buffer size: %lu\n", bufsize);
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// Set period (number of frames ideally written at a time)
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// Somewhat arbitrary for now
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unsigned int wanted_period = bufsize / 4;
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period_len = wanted_period; // microseconds
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if (snd_pcm_hw_params_set_period_time_near(pcm_handle, hwparams, &period_len, &dir) < 0) {
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throw _T("ALSA player: Couldn't set period length");
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}
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LOG_D_IF(period_len != wanted_period, "player/audio/alsa") << "Couldn't get wanted period size of " << wanted_period << ", got " << period_len << " instead";
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if (snd_pcm_hw_params_get_period_size(hwparams, &period, &dir) < 0) {
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LOG_E("player/audio/alsa") << "Couldn't get period size";
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throw _T("ALSA player: Couldn't get period size");
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}
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printf("ALSA player: Period size: %lu\n", period);
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// Apply parameters
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if (snd_pcm_hw_params(pcm_handle, hwparams) < 0) {
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LOG_E("player/audio/alsa") << "Failed applying sound hardware settings";
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throw _T("ALSA player: Failed applying sound hardware settings");
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}
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// And free memory again
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snd_pcm_hw_params_free(hwparams);
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}
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/// @brief DOCME
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///
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void AlsaPlayer::SetUpAsync()
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{
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// Prepare software params struct
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snd_pcm_sw_params_t *sw_params;
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snd_pcm_sw_params_malloc (&sw_params);
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// Get current parameters
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if (snd_pcm_sw_params_current(pcm_handle, sw_params) < 0) {
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LOG_E("player/audio/alsa") << "Couldn't get current SW params";
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throw _T("ALSA player: Couldn't get current SW params");
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}
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// How full the buffer must be before playback begins
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if (snd_pcm_sw_params_set_start_threshold(pcm_handle, sw_params, bufsize - period) < 0) {
|
||||
LOG_E("player/audio/alsa") << "Failed setting start threshold";
|
||||
throw _T("ALSA player: Failed setting start threshold");
|
||||
}
|
||||
|
||||
// The the largest write guaranteed never to block
|
||||
if (snd_pcm_sw_params_set_avail_min(pcm_handle, sw_params, period) < 0) {
|
||||
LOG_E("player/audio/alsa") << "Failed setting min available buffer";
|
||||
throw _T("ALSA player: Failed setting min available buffer");
|
||||
}
|
||||
|
||||
// Apply settings
|
||||
if (snd_pcm_sw_params(pcm_handle, sw_params) < 0) {
|
||||
LOG_E("player/audio/alsa") << "Failed applying SW params";
|
||||
throw _T("ALSA player: Failed applying SW params");
|
||||
}
|
||||
|
||||
// And free struct again
|
||||
snd_pcm_sw_params_free(sw_params);
|
||||
|
||||
// Prepare for playback
|
||||
snd_pcm_prepare(pcm_handle);
|
||||
|
||||
// Attach async handler
|
||||
if (snd_async_add_pcm_handler(&pcm_callback, pcm_handle, async_write_handler, this) < 0) {
|
||||
LOG_E("player/audio/alsa") << "Failed attaching async handler";
|
||||
throw _T("ALSA player: Failed attaching async handler");
|
||||
else
|
||||
{
|
||||
throw 1; // FIXME
|
||||
}
|
||||
}
|
||||
|
||||
/// @brief Close stream
|
||||
/// @return
|
||||
///
|
||||
|
||||
void AlsaPlayer::CloseStream()
|
||||
{
|
||||
if (!open) return;
|
||||
|
||||
Stop();
|
||||
{
|
||||
PthreadMutexLocker ml(ps.mutex);
|
||||
ps.signal_stop = true;
|
||||
ps.signal_close = true;
|
||||
printf("AlsaPlayer: close stream, stop+close signal\n");
|
||||
pthread_cond_signal(&ps.cond);
|
||||
}
|
||||
|
||||
// Remove async handler
|
||||
snd_async_del_handler(pcm_callback);
|
||||
pthread_join(thread, 0); // FIXME: check for errors
|
||||
|
||||
// Close device
|
||||
snd_pcm_close(pcm_handle);
|
||||
|
||||
// No longer working
|
||||
open = false;
|
||||
}
|
||||
|
||||
/// @brief Play
|
||||
/// @param start
|
||||
/// @param count
|
||||
///
|
||||
void AlsaPlayer::Play(int64_t start,int64_t count)
|
||||
|
||||
void AlsaPlayer::Play(int64_t start, int64_t count)
|
||||
{
|
||||
if (playing) {
|
||||
// Quick reset
|
||||
playing = false;
|
||||
snd_pcm_drop(pcm_handle);
|
||||
OpenStream();
|
||||
|
||||
{
|
||||
PthreadMutexLocker ml(ps.mutex);
|
||||
ps.signal_start = true;
|
||||
ps.signal_stop = true; // make sure to stop any ongoing playback first
|
||||
ps.start_position = start;
|
||||
ps.end_position = start + count;
|
||||
pthread_cond_signal(&ps.cond);
|
||||
}
|
||||
|
||||
// Set params
|
||||
start_frame = start;
|
||||
cur_frame = start;
|
||||
end_frame = start + count;
|
||||
playing = true;
|
||||
|
||||
// Prepare a bit
|
||||
snd_pcm_prepare (pcm_handle);
|
||||
async_write_handler(pcm_callback);
|
||||
|
||||
// And go!
|
||||
snd_pcm_start(pcm_handle);
|
||||
|
||||
// Update timer
|
||||
if (displayTimer && !displayTimer->IsRunning()) displayTimer->Start(15);
|
||||
}
|
||||
|
||||
/// @brief Stop
|
||||
/// @param timerToo
|
||||
/// @return
|
||||
///
|
||||
|
||||
void AlsaPlayer::Stop(bool timerToo)
|
||||
{
|
||||
if (!open) return;
|
||||
if (!playing) return;
|
||||
|
||||
// Reset data
|
||||
playing = false;
|
||||
start_frame = 0;
|
||||
cur_frame = 0;
|
||||
end_frame = 0;
|
||||
{
|
||||
PthreadMutexLocker ml(ps.mutex);
|
||||
ps.signal_stop = true;
|
||||
printf("AlsaPlayer: stop stream, stop signal\n");
|
||||
pthread_cond_signal(&ps.cond);
|
||||
}
|
||||
|
||||
// Then drop the playback
|
||||
snd_pcm_drop(pcm_handle);
|
||||
|
||||
if (timerToo && displayTimer) {
|
||||
displayTimer->Stop();
|
||||
}
|
||||
if (timerToo && displayTimer) {
|
||||
displayTimer->Stop();
|
||||
}
|
||||
}
|
||||
|
||||
/// @brief DOCME
|
||||
/// @return
|
||||
///
|
||||
bool AlsaPlayer::IsPlaying()
|
||||
{
|
||||
return playing;
|
||||
return open && ps.playing;
|
||||
}
|
||||
|
||||
/// @brief Set end
|
||||
/// @param pos
|
||||
///
|
||||
|
||||
void AlsaPlayer::SetEndPosition(int64_t pos)
|
||||
{
|
||||
end_frame = pos;
|
||||
if (!open) return;
|
||||
PthreadMutexLocker ml(ps.mutex);
|
||||
ps.end_position = pos;
|
||||
}
|
||||
|
||||
/// @brief Set current position
|
||||
/// @param pos
|
||||
///
|
||||
|
||||
void AlsaPlayer::SetCurrentPosition(int64_t pos)
|
||||
{
|
||||
cur_frame = pos;
|
||||
if (!open) return;
|
||||
|
||||
PthreadMutexLocker ml(ps.mutex);
|
||||
|
||||
if (!ps.playing) return;
|
||||
|
||||
ps.start_position = pos;
|
||||
ps.signal_start = true;
|
||||
ps.signal_stop = true;
|
||||
printf("AlsaPlayer: set position, stop+start signal\n");
|
||||
pthread_cond_signal(&ps.cond);
|
||||
}
|
||||
|
||||
/// @brief DOCME
|
||||
/// @return
|
||||
///
|
||||
int64_t AlsaPlayer::GetStartPosition()
|
||||
{
|
||||
return start_frame;
|
||||
if (!open) return 0;
|
||||
return ps.start_position;
|
||||
}
|
||||
|
||||
/// @brief DOCME
|
||||
/// @return
|
||||
///
|
||||
int64_t AlsaPlayer::GetEndPosition()
|
||||
{
|
||||
return end_frame;
|
||||
if (!open) return 0;
|
||||
return ps.end_position;
|
||||
}
|
||||
|
||||
/// @brief Get current position
|
||||
/// @return
|
||||
///
|
||||
|
||||
int64_t AlsaPlayer::GetCurrentPosition()
|
||||
{
|
||||
// FIXME: this should be based on not duration played but actual sample being heard
|
||||
// (during vidoeo playback, cur_frame might get changed to resync)
|
||||
snd_pcm_sframes_t delay = 0;
|
||||
snd_pcm_delay(pcm_handle, &delay); // don't bother catching errors here
|
||||
return cur_frame - delay;
|
||||
if (!open) return 0;
|
||||
|
||||
int64_t lastpos;
|
||||
timespec lasttime;
|
||||
int64_t samplerate;
|
||||
|
||||
{
|
||||
//PthreadMutexLocker ml(ps.mutex);
|
||||
lastpos = ps.last_position;
|
||||
lasttime = ps.last_position_time;
|
||||
samplerate = ps.provider->GetSampleRate();
|
||||
}
|
||||
|
||||
timespec now;
|
||||
clock_gettime(CLOCK_REALTIME, &now);
|
||||
|
||||
const double NANO = 1000000000; // nano- is 10^-9
|
||||
|
||||
double now_sec = now.tv_sec + now.tv_nsec/NANO;
|
||||
double last_sec = lasttime.tv_sec + lasttime.tv_nsec/NANO;
|
||||
double diff_sec = now_sec - last_sec;
|
||||
|
||||
int64_t pos = lastpos + (int64_t)(diff_sec * samplerate);
|
||||
//printf("AlsaPlayer: current position = %lld\n", pos);
|
||||
|
||||
return pos;
|
||||
}
|
||||
|
||||
/// @brief DOCME
|
||||
/// @param pcm_callback
|
||||
///
|
||||
void AlsaPlayer::async_write_handler(snd_async_handler_t *pcm_callback)
|
||||
void AlsaPlayer::SetVolume(double vol)
|
||||
{
|
||||
// TODO: check for broken pipes in here and restore as needed
|
||||
AlsaPlayer *player = (AlsaPlayer*)snd_async_handler_get_callback_private(pcm_callback);
|
||||
if (!open) return;
|
||||
PthreadMutexLocker ml(ps.mutex);
|
||||
ps.volume = vol;
|
||||
ps.signal_volume = true;
|
||||
pthread_cond_signal(&ps.cond);
|
||||
}
|
||||
|
||||
if (player->cur_frame >= player->end_frame + player->rate) {
|
||||
// More than a second past end of stream
|
||||
snd_pcm_drain(player->pcm_handle);
|
||||
player->playing = false;
|
||||
return;
|
||||
}
|
||||
|
||||
snd_pcm_sframes_t frames = snd_pcm_avail_update(player->pcm_handle);
|
||||
|
||||
if (frames == -EPIPE) {
|
||||
snd_pcm_prepare(player->pcm_handle);
|
||||
frames = snd_pcm_avail_update(player->pcm_handle);
|
||||
}
|
||||
double AlsaPlayer::GetVolume()
|
||||
{
|
||||
if (!open) return 1.0;
|
||||
PthreadMutexLocker ml(ps.mutex);
|
||||
return ps.volume;
|
||||
}
|
||||
|
||||
// TODO: handle underrun
|
||||
|
||||
if (player->cur_frame >= player->end_frame) {
|
||||
// Past end of stream, add some silence
|
||||
void *buf = calloc(frames, player->bpf);
|
||||
snd_pcm_writei(player->pcm_handle, buf, frames);
|
||||
free(buf);
|
||||
player->cur_frame += frames;
|
||||
return;
|
||||
}
|
||||
|
||||
void *buf = malloc(player->period * player->bpf);
|
||||
while (frames >= player->period) {
|
||||
player->provider->GetAudioWithVolume(buf, player->cur_frame, player->period, player->volume);
|
||||
int err = snd_pcm_writei(player->pcm_handle, buf, player->period);
|
||||
if(err == -EPIPE) {
|
||||
snd_pcm_prepare(player->pcm_handle);
|
||||
}
|
||||
player->cur_frame += player->period;
|
||||
frames = snd_pcm_avail_update(player->pcm_handle);
|
||||
}
|
||||
free(buf);
|
||||
// The factory method
|
||||
AudioPlayer * AlsaPlayerFactory::CreatePlayer()
|
||||
{
|
||||
return new AlsaPlayer();
|
||||
}
|
||||
|
||||
#endif // WITH_ALSA
|
||||
|
||||
|
|
|
|||
|
|
@ -1,4 +1,4 @@
|
|||
// Copyright (c) 2007, Niels Martin Hansen
|
||||
// Copyright (c) 2011, Niels Martin Hansen
|
||||
// All rights reserved.
|
||||
//
|
||||
// Redistribution and use in source and binary forms, with or without
|
||||
|
|
@ -39,102 +39,11 @@
|
|||
#include <alsa/asoundlib.h>
|
||||
|
||||
#include "include/aegisub/audio_player.h"
|
||||
#include "include/aegisub/audio_provider.h"
|
||||
|
||||
/// DOCME
|
||||
/// @class AlsaPlayer
|
||||
/// @brief DOCME
|
||||
///
|
||||
/// DOCME
|
||||
class AlsaPlayer : public AudioPlayer {
|
||||
private:
|
||||
|
||||
/// DOCME
|
||||
bool open;
|
||||
|
||||
/// DOCME
|
||||
volatile bool playing;
|
||||
|
||||
/// DOCME
|
||||
volatile float volume;
|
||||
|
||||
/// DOCME
|
||||
volatile unsigned long start_frame; // first frame of playback
|
||||
|
||||
/// DOCME
|
||||
volatile unsigned long cur_frame; // last written frame + 1
|
||||
|
||||
/// DOCME
|
||||
volatile unsigned long end_frame; // last frame to play
|
||||
|
||||
/// DOCME
|
||||
unsigned long bpf; // bytes per frame
|
||||
|
||||
/// DOCME
|
||||
AudioProvider *provider;
|
||||
|
||||
/// DOCME
|
||||
snd_pcm_t *pcm_handle; // device handle
|
||||
|
||||
/// DOCME
|
||||
snd_pcm_stream_t stream; // stream direction
|
||||
|
||||
/// DOCME
|
||||
snd_async_handler_t *pcm_callback;
|
||||
|
||||
/// DOCME
|
||||
snd_pcm_format_t sample_format;
|
||||
|
||||
/// DOCME
|
||||
unsigned int rate; // sample rate of audio
|
||||
|
||||
/// DOCME
|
||||
unsigned int real_rate; // actual sample rate played back
|
||||
|
||||
/// DOCME
|
||||
unsigned int period_len; // length of period in microseconds
|
||||
|
||||
/// DOCME
|
||||
unsigned int buflen; // length of buffer in microseconds
|
||||
|
||||
/// DOCME
|
||||
snd_pcm_uframes_t period; // size of period in frames
|
||||
|
||||
/// DOCME
|
||||
snd_pcm_uframes_t bufsize; // size of buffer in frames
|
||||
|
||||
void SetUpHardware();
|
||||
void SetUpAsync();
|
||||
|
||||
static void async_write_handler(snd_async_handler_t *pcm_callback);
|
||||
|
||||
class AlsaPlayerFactory : public AudioPlayerFactory {
|
||||
public:
|
||||
AlsaPlayer();
|
||||
~AlsaPlayer();
|
||||
|
||||
void OpenStream();
|
||||
void CloseStream();
|
||||
|
||||
void Play(int64_t start,int64_t count);
|
||||
void Stop(bool timerToo=true);
|
||||
bool IsPlaying();
|
||||
|
||||
int64_t GetStartPosition();
|
||||
int64_t GetEndPosition();
|
||||
int64_t GetCurrentPosition();
|
||||
void SetEndPosition(int64_t pos);
|
||||
void SetCurrentPosition(int64_t pos);
|
||||
|
||||
/// @brief DOCME
|
||||
/// @param vol
|
||||
/// @return
|
||||
///
|
||||
void SetVolume(double vol) { volume = vol; }
|
||||
|
||||
/// @brief DOCME
|
||||
/// @return
|
||||
///
|
||||
double GetVolume() { return volume; }
|
||||
AudioPlayer *CreatePlayer();
|
||||
};
|
||||
|
||||
#endif
|
||||
|
||||
|
|
|
|||
Loading…
Reference in New Issue