videoplayer/src/audiodec.rs

   1 use std::time::Duration;
   2 use std::thread::JoinHandle;
   3 use std::sync::{Arc, Mutex};
   4 use std::sync::atomic::{AtomicBool, AtomicUsize, Ordering};
   5 use std::sync::mpsc::{Receiver, SyncSender, TrySendError};
   6 use std::str::FromStr;
   7
   8 use sdl2::AudioSubsystem;
   9 use sdl2::audio::{AudioDevice, AudioCallback, AudioSpecDesired};
  10
  11 use nihav_core::formats::*;
  12 use nihav_core::codecs::*;
  13 use nihav_core::soundcvt::*;
  14
  15 use super::{DecoderStuff, DecoderType, PktSendEvent};
  16
  17 static SKIP_ADECODING: AtomicBool = AtomicBool::new(false);
  18 static AUDIO_VOLUME: AtomicUsize = AtomicUsize::new(100);
  19 static AUDIO_END: AtomicBool = AtomicBool::new(false);
  20 static CUR_QUEUE_FILL: AtomicUsize = AtomicUsize::new(0);
  21 static SAMPLE_RATE: AtomicUsize = AtomicUsize::new(0);
  22 static CHANNELS: AtomicUsize = AtomicUsize::new(0);
  23
  24 static CURRENT_TIME: AtomicUsize = AtomicUsize::new(0);
  25 static CURRENT_TIME_SET: AtomicBool = AtomicBool::new(false);
  26
  27 const QUEUE_INITIAL_SIZE: usize = 16384;
  28 const QUEUE_REFILL_LIMIT: usize = 262144;
  29
  30 struct AudioQueue {
  31     queue:  Vec<i16>,
  32     start:  usize,
  33     end:    usize,
  34     srate:  usize,
  35     chans:  usize,
  36     spos:   usize,
  37 }
  38
  39 impl AudioQueue {
  40     fn new(srate: usize, chans: usize) -> Self {
  41         SAMPLE_RATE.store(srate, Ordering::Relaxed);
  42         CHANNELS.store(chans, Ordering::Relaxed);
  43         CUR_QUEUE_FILL.store(0, Ordering::Relaxed);
  44         Self {
  45             queue:  Vec::with_capacity(QUEUE_INITIAL_SIZE),
  46             start:  0,
  47             end:    0,
  48             srate, chans,
  49             spos:   0,
  50         }
  51     }
  52     fn home(&mut self) {
  53         if self.start == 0 { return; }
  54         let fill = self.fill();
  55         if fill > 0 {
  56             if fill < self.start {
  57                 let (dst, src) = self.queue.split_at_mut(self.start);
  58                 dst[..fill].copy_from_slice(&src[..fill]);
  59             } else {
  60                 for i in 0..fill {
  61                     self.queue[i] = self.queue[self.start + i];
  62                 }
  63             }
  64         }
  65         self.start = 0;
  66         self.end = fill;
  67     }
  68     fn set_time(&mut self) {
  69         let fill = self.fill();
  70         let samp_time = self.spos.saturating_sub(fill / self.chans);
  71         CURRENT_TIME.store(samp_time * 1000 / self.srate, Ordering::Relaxed);
  72         CURRENT_TIME_SET.store(true, Ordering::Relaxed);
  73         CUR_QUEUE_FILL.store(self.fill(), Ordering::Relaxed);
  74     }
  75     fn add(&mut self, src: &[i16], samplepos: usize) {
  76         if self.end + src.len() > self.queue.len() {
  77             self.home();
  78         }
  79         if self.end + src.len() > self.queue.len() {
  80             self.queue.resize(self.end + src.len(), 0);
  81         }
  82         self.queue[self.end..][..src.len()].copy_from_slice(&src);
  83         self.end += src.len();
  84         self.spos = samplepos;
  85         self.set_time();
  86     }
  87     fn add_bytes(&mut self, src: &[u8], samplepos: usize) {
  88         let srclen = src.len() / 2;
  89         if self.end + srclen > self.queue.len() {
  90             self.home();
  91         }
  92         if self.end + srclen > self.queue.len() {
  93             self.queue.resize(self.end + srclen, 0);
  94         }
  95         for (dst, src) in self.queue[self.end..][..srclen].iter_mut().zip(src.chunks_exact(2)) {
  96             *dst = (u16::from(src[0]) + u16::from(src[1]) * 256) as i16;
  97         }
  98         self.end += srclen;
  99         self.spos = samplepos;
 100         self.set_time();
 101     }
 102     fn drain(&mut self, size: usize) {
 103         let fill = self.fill();
 104         if size >= fill {
 105             self.flush();
 106         } else {
 107             self.start += size;
 108         }
 109         self.set_time();
 110     }
 111     fn fill(&self) -> usize { self.end - self.start }
 112     fn flush(&mut self) {
 113         self.start  = 0;
 114         self.end    = 0;
 115     }
 116 }
 117
 118 pub struct AudioOutput {
 119     queue:      Arc<Mutex<AudioQueue>>,
 120 }
 121
 122 impl AudioCallback for AudioOutput {
 123     type Channel = i16;
 124
 125     fn callback(&mut self, out: &mut [Self::Channel]) {
 126         let mut queue = self.queue.lock().unwrap();
 127         let dstlen = out.len();
 128         let copylen = queue.fill().min(dstlen);
 129         let volume = AUDIO_VOLUME.load(Ordering::Relaxed) as i32;
 130         if volume == 100 {
 131             out[..copylen].copy_from_slice(&queue.queue[queue.start..][..copylen]);
 132         } else {
 133             for (dst, &src) in out[..copylen].iter_mut().zip(queue.queue[queue.start..].iter()) {
 134                 *dst = (i32::from(src) * volume / 100).max(-32768).min(32767) as i16;
 135             }
 136         }
 137         queue.drain(copylen);
 138         for el in out[copylen..].iter_mut() { *el = 0; }
 139     }
 140 }
 141
 142 fn dummy_audio_thread(aprecv: Receiver<PktSendEvent>) -> JoinHandle<()> {
 143     std::thread::Builder::new().name("acontrol-dummy".to_string()).spawn(move ||{
 144                     loop {
 145                         match aprecv.recv() {
 146                             Ok(PktSendEvent::End) => break,
 147                             Ok(PktSendEvent::ImmediateEnd) => break,
 148                             Err(_) => {
 149                                 break;
 150                             },
 151                             _ => {},
 152                         };
 153                     }
 154                 }).unwrap()
 155 }
 156
 157 type AudioPlaybackType = Option<AudioDevice<AudioOutput>>;
 158
 159 fn start_audio_decoding(asystem: &AudioSubsystem, ainfo: NAAudioInfo, mut audio_dec: DecoderStuff, aprecv: Receiver<PktSendEvent>) -> (AudioPlaybackType, JoinHandle<()>) {
 160     let ch = ainfo.channels.max(2);
 161     let desired_spec = AudioSpecDesired {
 162         freq:       Some(ainfo.sample_rate as i32),
 163         channels:   Some(ch),
 164         samples:    None
 165     };
 166     let dst_info = NAAudioInfo {
 167             sample_rate:    ainfo.sample_rate,
 168             channels:       ch,
 169             format:         SND_S16_FORMAT,
 170             block_len:      0,
 171         };
 172     let queue = Arc::new(Mutex::new(AudioQueue::new(ainfo.sample_rate as usize, ch as usize)));
 173     let qclone = queue.clone();
 174     let ret = asystem.open_playback(None, &desired_spec, |_spec| {
 175             AudioOutput {
 176                 queue:      qclone,
 177             }
 178         });
 179     if ret.is_err() {
 180         return (None, dummy_audio_thread(aprecv))
 181     }
 182     let adevice = ret.unwrap();
 183     (Some(adevice), std::thread::Builder::new().name("acontrol".to_string()).spawn(move ||{
 184             let adec = if let DecoderType::Audio(ref mut dec) = audio_dec.dec { dec } else { panic!("not an audio decoder!"); };
 185             let mut samplepos = 0usize;
 186             let dst_chmap = if dst_info.channels == 2 {
 187                     NAChannelMap::from_str("L,R").unwrap()
 188                 } else {
 189                     NAChannelMap::from_str("C").unwrap()
 190                 };
 191             SKIP_ADECODING.store(false, Ordering::Relaxed);
 192             loop {
 193                 match aprecv.recv() {
 194                     Ok(PktSendEvent::Packet(pkt)) => {
 195                         loop {
 196                             if CUR_QUEUE_FILL.load(Ordering::Relaxed)
 197  < QUEUE_REFILL_LIMIT || SKIP_ADECODING.load(Ordering::Relaxed) {
 198                                 break;
 199                             }
 200                             std::thread::sleep(Duration::from_millis(100));
 201                         }
 202                         if !SKIP_ADECODING.load(Ordering::Relaxed) {
 203                             if let Ok(frm) = adec.decode(&mut audio_dec.dsupp, &pkt) {
 204                                 let buf = frm.get_buffer();
 205                                 if let Some(pts) = frm.get_pts() {
 206                                     samplepos = NATimeInfo::ts_to_time(pts, u64::from(dst_info.sample_rate), frm.ts.tb_num, frm.ts.tb_den) as usize;
 207                                 }
 208                                 samplepos += buf.get_audio_length();
 209                                 if let Ok(out_buf) = convert_audio_frame(&buf, &dst_info, &dst_chmap) {
 210                                     match out_buf {
 211                                         NABufferType::AudioI16(abuf) => {
 212                                             let mut qdata = queue.lock().unwrap();
 213                                             qdata.add(abuf.get_data(), samplepos);
 214                                             drop(qdata);
 215                                         },
 216                                         NABufferType::AudioPacked(abuf) => {
 217                                             let mut qdata = queue.lock().unwrap();
 218                                             qdata.add_bytes(abuf.get_data(), samplepos);
 219                                             drop(qdata);
 220                                         },
 221                                         _ => {},
 222                                     };
 223                                 }
 224                             }
 225                         }
 226                     },
 227                     Ok(PktSendEvent::GetFrames) => {},
 228                     Ok(PktSendEvent::Flush) => {
 229                         adec.flush();
 230                         let mut qdata = queue.lock().unwrap();
 231                         qdata.flush();
 232                         SKIP_ADECODING.store(false, Ordering::Relaxed);
 233                     },
 234                     Ok(PktSendEvent::End) => break,
 235                     Ok(PktSendEvent::ImmediateEnd) => {
 236                         let mut qdata = queue.lock().unwrap();
 237                         qdata.flush();
 238                         break;
 239                     },
 240                     Ok(PktSendEvent::HurryUp) => {},
 241                     Err(_) => {
 242                         break;
 243                     },
 244                 };
 245             }
 246             loop {
 247                 let qdata = queue.lock().unwrap();
 248                 if qdata.fill() == 0 || SKIP_ADECODING.load(Ordering::Relaxed) {
 249                     break;
 250                 }
 251             }
 252             AUDIO_END.store(true, Ordering::Relaxed);
 253         }).unwrap())
 254 }
 255
 256 pub struct AudioControl {
 257     aqueue:         Vec<PktSendEvent>,
 258     apsend:         SyncSender<PktSendEvent>,
 259     adevice:        AudioPlaybackType,
 260     athread:        JoinHandle<()>,
 261 }
 262
 263 impl AudioControl {
 264     pub fn new(audio_dec: Option<DecoderStuff>, ainfo: Option<NAAudioInfo>, asystem: &AudioSubsystem) -> Self {
 265         let (apsend, aprecv) = std::sync::mpsc::sync_channel::<PktSendEvent>(20);
 266         let (adevice, athread) = if let Some(audio_dec) = audio_dec {
 267                 start_audio_decoding(asystem, ainfo.unwrap(), audio_dec, aprecv)
 268             } else {
 269                 (None, dummy_audio_thread(aprecv))
 270             };
 271         AUDIO_END.store(false, Ordering::Relaxed);
 272
 273         Self {
 274             aqueue:     Vec::new(),
 275             apsend,
 276             adevice,
 277             athread,
 278         }
 279     }
 280     pub fn has_audio(&self) -> bool { self.adevice.is_some() }
 281     pub fn pause(&mut self) {
 282         if let Some(ref device) = self.adevice {
 283             device.pause();
 284         }
 285     }
 286     pub fn resume(&mut self) {
 287         if let Some(ref device) = self.adevice {
 288             device.resume();
 289         }
 290     }
 291     pub fn set_volume(&mut self, volume: usize) {
 292         AUDIO_VOLUME.store(volume, Ordering::Relaxed);
 293     }
 294     pub fn get_volume(&self) -> usize {
 295         AUDIO_VOLUME.load(Ordering::Relaxed)
 296     }
 297     pub fn is_audio_end(&self) -> bool {
 298         AUDIO_END.load(Ordering::Relaxed)
 299     }
 300     pub fn get_fill(&self) -> usize { CUR_QUEUE_FILL.load(Ordering::Relaxed) }
 301     pub fn get_time(&self) -> Option<u64> {
 302         if CURRENT_TIME_SET.load(Ordering::Relaxed) {
 303             Some(CURRENT_TIME.load(Ordering::Relaxed) as u64)
 304         } else {
 305             None
 306         }
 307     }
 308     pub fn get_time_left(&self) -> u64 {
 309         let srate = SAMPLE_RATE.load(Ordering::Relaxed);
 310         let chans = CHANNELS.load(Ordering::Relaxed);
 311         if srate != 0 && chans != 0{
 312             let fill = self.get_fill();
 313             (fill * 1000 / srate / chans) as u64
 314         } else {
 315             0
 316         }
 317     }
 318
 319     pub fn get_queue_size(&self) -> usize { self.aqueue.len() }
 320     pub fn try_send_audio(&mut self, evt: PktSendEvent) -> bool {
 321         if self.aqueue.len() > 0 {
 322             self.aqueue.push(evt);
 323             false
 324         } else {
 325             self.try_send_event(evt)
 326         }
 327     }
 328     fn try_send_event(&mut self, evt: PktSendEvent) -> bool {
 329         if let Err(TrySendError::Full(evt)) = self.apsend.try_send(evt) {
 330             self.aqueue.insert(0, evt);
 331             false
 332         } else {
 333             true
 334         }
 335     }
 336     pub fn try_send_queued(&mut self) -> bool {
 337         while !self.aqueue.is_empty() {
 338             let pkt = self.aqueue.remove(0);
 339             if !self.try_send_event(pkt) {
 340                  return false;
 341             }
 342         }
 343         true
 344     }
 345
 346     pub fn flush(&mut self) {
 347         self.pause();
 348         self.aqueue.clear();
 349         SKIP_ADECODING.store(true, Ordering::Release);
 350         CURRENT_TIME_SET.store(false, Ordering::Release);
 351         let _ = self.apsend.send(PktSendEvent::Flush);
 352     }
 353     pub fn finish(self) {
 354         SKIP_ADECODING.store(true, Ordering::Release);
 355         let _ = self.apsend.send(PktSendEvent::ImmediateEnd);
 356         self.athread.join().unwrap();
 357     }
 358 }