The Tor Browser: media/libcubeb/src/cubeb_sndio.c@b8a032363ba2 (annotated)

media/libcubeb/src/cubeb_sndio.c@b8a032363ba2 (annotated)

media/libcubeb/src/cubeb_sndio.c

Thu, 22 Jan 2015 13:21:57 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Thu, 22 Jan 2015 13:21:57 +0100
branch: TOR_BUG_9701
changeset 15: b8a032363ba2
permissions: -rw-r--r--

Incorporate requested changes from Mozilla in review:
https://bugzilla.mozilla.org/show_bug.cgi?id=1123480#c6

 /*
  * Copyright (c) 2011 Alexandre Ratchov <alex@caoua.org>
  *
  * This program is made available under an ISC-style license.  See the
  * accompanying file LICENSE for details.
  */
 #include <poll.h>
 #include <pthread.h>
 #include <sndio.h>
 #include <stdlib.h>
 #include <stdio.h>
 #include <assert.h>
 #include "cubeb/cubeb.h"
 #include "cubeb-internal.h"
 #if defined(CUBEB_SNDIO_DEBUG)
 #define DPR(...) fprintf(stderr, __VA_ARGS__);
 #else
 #define DPR(...) do {} while(0)
 #endif
 static struct cubeb_ops const sndio_ops;
 struct cubeb {
   struct cubeb_ops const * ops;
 };
 struct cubeb_stream {
   cubeb * context;
   pthread_t th;			  /* to run real-time audio i/o */
   pthread_mutex_t mtx;		  /* protects hdl and pos */
   struct sio_hdl *hdl;		  /* link us to sndio */
   int active;			  /* cubec_start() called */
   int conv;			  /* need float->s16 conversion */
   unsigned char *buf;		  /* data is prepared here */
   unsigned int nfr;		  /* number of frames in buf */
   unsigned int bpf;		  /* bytes per frame */
   unsigned int pchan;		  /* number of play channels */
   uint64_t rdpos;		  /* frame number Joe hears right now */
   uint64_t wrpos;		  /* number of written frames */
   cubeb_data_callback data_cb;    /* cb to preapare data */
   cubeb_state_callback state_cb;  /* cb to notify about state changes */
   void *arg;			  /* user arg to {data,state}_cb */
 };
 static void
 float_to_s16(void *ptr, long nsamp)
 {
   int16_t *dst = ptr;
   float *src = ptr;
   while (nsamp-- > 0)
     *(dst++) = *(src++) * 32767;
 }
 static void
 sndio_onmove(void *arg, int delta)
 {
   cubeb_stream *s = (cubeb_stream *)arg;
   s->rdpos += delta;
 }
 static void *
 sndio_mainloop(void *arg)
 {
 #define MAXFDS 8
   struct pollfd pfds[MAXFDS];
   cubeb_stream *s = arg;
   int n, nfds, revents, state;
   size_t start = 0, end = 0;
   long nfr;
   DPR("sndio_mainloop()\n");
   s->state_cb(s, s->arg, CUBEB_STATE_STARTED);
   pthread_mutex_lock(&s->mtx);
   if (!sio_start(s->hdl)) {
     pthread_mutex_unlock(&s->mtx);
     return NULL;
   }
   DPR("sndio_mainloop(), started\n");
   start = end = s->nfr;
   for (;;) {
     if (!s->active) {
       DPR("sndio_mainloop() stopped\n");
       state = CUBEB_STATE_STOPPED;
       break;
     }
     if (start == end) {
       if (end < s->nfr) {
         DPR("sndio_mainloop() drained\n");
         state = CUBEB_STATE_DRAINED;
         break;
       }
       pthread_mutex_unlock(&s->mtx);
       nfr = s->data_cb(s, s->arg, s->buf, s->nfr);
       pthread_mutex_lock(&s->mtx);
       if (nfr < 0) {
         DPR("sndio_mainloop() cb err\n");
         state = CUBEB_STATE_ERROR;
         break;
       }
       if (s->conv)
         float_to_s16(s->buf, nfr * s->pchan);
       start = 0;
       end = nfr * s->bpf;
     }
     if (end == 0)
       continue;
     nfds = sio_pollfd(s->hdl, pfds, POLLOUT);
     if (nfds > 0) {
       pthread_mutex_unlock(&s->mtx);
       n = poll(pfds, nfds, -1);
       pthread_mutex_lock(&s->mtx);
       if (n < 0)
         continue;
     }
     revents = sio_revents(s->hdl, pfds);
     if (revents & POLLHUP)
       break;
     if (revents & POLLOUT) {
       n = sio_write(s->hdl, s->buf + start, end - start);
       if (n == 0) {
         DPR("sndio_mainloop() werr\n");
         state = CUBEB_STATE_ERROR;
         break;
       }
       s->wrpos = 0;
       start += n;
     }
   }
   sio_stop(s->hdl);
   s->rdpos = s->wrpos;
   pthread_mutex_unlock(&s->mtx);
   s->state_cb(s, s->arg, state);
   return NULL;
 }
 /*static*/ int
 sndio_init(cubeb **context, char const *context_name)
 {
   DPR("sndio_init(%s)\n", context_name);
   *context = malloc(sizeof(*context));
   (*context)->ops = &sndio_ops;
   (void)context_name;
   return CUBEB_OK;
 }
 static char const *
 sndio_get_backend_id(cubeb *context)
 {
   return "sndio";
 }
 static void
 sndio_destroy(cubeb *context)
 {
   DPR("sndio_destroy()\n");
   free(context);
 }
 static int
 sndio_stream_init(cubeb *context,
                   cubeb_stream **stream,
                   char const *stream_name,
                   cubeb_stream_params stream_params, unsigned int latency,
                   cubeb_data_callback data_callback,
                   cubeb_state_callback state_callback,
                   void *user_ptr)
 {
   cubeb_stream *s;
   struct sio_par wpar, rpar;
   DPR("sndio_stream_init(%s)\n", stream_name);
   size_t size;
   s = malloc(sizeof(cubeb_stream));
   if (s == NULL)
     return CUBEB_ERROR;
   s->context = context;
   s->hdl = sio_open(NULL, SIO_PLAY, 0);
   if (s->hdl == NULL) {
     free(s);
     DPR("sndio_stream_init(), sio_open() failed\n");
     return CUBEB_ERROR;
   }
   sio_initpar(&wpar);
   wpar.sig = 1;
   wpar.bits = 16;
   switch (stream_params.format) {
   case CUBEB_SAMPLE_S16LE:
     wpar.le = 1;
     break;
   case CUBEB_SAMPLE_S16BE:
     wpar.le = 0;
     break;
   case CUBEB_SAMPLE_FLOAT32NE:
     wpar.le = SIO_LE_NATIVE;
     break;
   default:
     DPR("sndio_stream_init() unsupported format\n");
     return CUBEB_ERROR_INVALID_FORMAT;
   }
   wpar.rate = stream_params.rate;
   wpar.pchan = stream_params.channels;
   wpar.appbufsz = latency * wpar.rate / 1000;
   if (!sio_setpar(s->hdl, &wpar) || !sio_getpar(s->hdl, &rpar)) {
     sio_close(s->hdl);
     free(s);
     DPR("sndio_stream_init(), sio_setpar() failed\n");
     return CUBEB_ERROR;
   }
   if (rpar.bits != wpar.bits || rpar.le != wpar.le ||
       rpar.sig != wpar.sig || rpar.rate != wpar.rate ||
       rpar.pchan != wpar.pchan) {
     sio_close(s->hdl);
     free(s);
     DPR("sndio_stream_init() unsupported params\n");
     return CUBEB_ERROR_INVALID_FORMAT;
   }
   sio_onmove(s->hdl, sndio_onmove, s);
   s->active = 0;
   s->nfr = rpar.round;
   s->bpf = rpar.bps * rpar.pchan;
   s->pchan = rpar.pchan;
   s->data_cb = data_callback;
   s->state_cb = state_callback;
   s->arg = user_ptr;
   s->mtx = PTHREAD_MUTEX_INITIALIZER;
   s->rdpos = s->wrpos = 0;
   if (stream_params.format == CUBEB_SAMPLE_FLOAT32LE) {
     s->conv = 1;
     size = rpar.round * rpar.pchan * sizeof(float);
   } else {
     s->conv = 0;
     size = rpar.round * rpar.pchan * rpar.bps;
   }
   s->buf = malloc(size);
   if (s->buf == NULL) {
     sio_close(s->hdl);
     free(s);
     return CUBEB_ERROR;
   }
   *stream = s;
   DPR("sndio_stream_init() end, ok\n");
   (void)context;
   (void)stream_name;
   return CUBEB_OK;
 }
 static int
 sndio_get_max_channel_count(cubeb * ctx, uint32_t * max_channels)
 {
   assert(ctx && max_channels);
   *max_channels = 8;
   return CUBEB_OK;
 }
 static int
 sndio_get_preferred_sample_rate(cubeb * ctx, uint32_t * rate)
 {
   // XXX Not yet implemented.
   *rate = 44100;
   return CUBEB_OK;
 }
 static int
 sndio_get_min_latency(cubeb * ctx, cubeb_stream_params params, uint32_t * latency_ms)
 {
   // XXX Not yet implemented.
   latency_ms = 40;
   return CUBEB_OK;
 }
 static void
 sndio_stream_destroy(cubeb_stream *s)
 {
   DPR("sndio_stream_destroy()\n");
   sio_close(s->hdl);
   free(s);
 }
 static int
 sndio_stream_start(cubeb_stream *s)
 {
   int err;
   DPR("sndio_stream_start()\n");
   s->active = 1;
   err = pthread_create(&s->th, NULL, sndio_mainloop, s);
   if (err) {
     s->active = 0;
     return CUBEB_ERROR;
   }
   return CUBEB_OK;
 }
 static int
 sndio_stream_stop(cubeb_stream *s)
 {
   void *dummy;
   DPR("sndio_stream_stop()\n");
   if (s->active) {
     s->active = 0;
     pthread_join(s->th, &dummy);
   }
   return CUBEB_OK;
 }
 static int
 sndio_stream_get_position(cubeb_stream *s, uint64_t *p)
 {
   pthread_mutex_lock(&s->mtx);
   DPR("sndio_stream_get_position() %lld\n", s->rdpos);
   *p = s->rdpos;
   pthread_mutex_unlock(&s->mtx);
   return CUBEB_OK;
 }
 static int
 sndio_stream_set_volume(cubeb_stream *s, float volume)
 {
   DPR("sndio_stream_set_volume(%f)\n", volume);
   pthread_mutex_lock(&s->mtx);
   sio_setvol(s->hdl, SIO_MAXVOL * volume);
   pthread_mutex_unlock(&s->mtx);
   return CUBEB_OK;
 }
 int
 sndio_stream_get_latency(cubeb_stream * stm, uint32_t * latency)
 {
   // http://www.openbsd.org/cgi-bin/man.cgi?query=sio_open
   // in the "Measuring the latency and buffers usage" paragraph.
   *latency = stm->wrpos - stm->rdpos;
   return CUBEB_OK;
 }
 static struct cubeb_ops const sndio_ops = {
   .init = sndio_init,
   .get_backend_id = sndio_get_backend_id,
   .get_max_channel_count = sndio_get_max_channel_count,
   .get_min_latency = sndio_get_min_latency,
   .get_preferred_sample_rate = sndio_get_preferred_sample_rate,
   .destroy = sndio_destroy,
   .stream_init = sndio_stream_init,
   .stream_destroy = sndio_stream_destroy,
   .stream_start = sndio_stream_start,
   .stream_stop = sndio_stream_stop,
   .stream_get_position = sndio_stream_get_position,
   .stream_get_latency = sndio_stream_get_latency
 };

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media/libcubeb/src/cubeb_sndio.c@b8a032363ba2 (annotated)

media/libcubeb/src/cubeb_sndio.c