Re: [Qemu-devel] [PATCH v3 15/50] audio: reduce glob_audio_state usage

["Zoltán Kővágó" <dirty.ice.hu@gmail.com>]

On 2019-01-17 10:22, Gerd Hoffmann wrote:
> On Thu, Jan 17, 2019 at 12:36:48AM +0100, Kővágó, Zoltán wrote:
>> Remove glob_audio_state from functions, where possible without breaking
>> the API.  This means that most static functions in audio.c now take an
>> AudioState pointer instead of implicitly using glob_audio_state.  Also
>> included a pointer in SWVoice*, HWVoice* structs, so that functions
>> dealing them can know the audio state without having to pass it around
>> separately.
>>
>> This is required in order to support multiple simultaneous audio
>> backends (added in a later commit).
> 
> I think it makes sense to split the series into smaller pieces, here
> would be a good place for the split (i.e. patches 1-14 which introduce
> -audiodev will be the first batch, this patch starts the next batch).

Alright, I think this series is pretty useless without at least the
multiple simultaneous backends part, but if it's easier to review in
smaller chunks, let's do it.

> 
>>
>> Signed-off-by: Kővágó, Zoltán <DirtY.iCE.hu@gmail.com>
>> ---
>>  audio/audio_int.h      |  7 +++++
>>  audio/audio_template.h | 46 ++++++++++++++++----------------
>>  audio/audio.c          | 59 +++++++++++++++++++-----------------------
>>  3 files changed, 56 insertions(+), 56 deletions(-)
>>
>> diff --git a/audio/audio_int.h b/audio/audio_int.h
>> index 66214199f0..2a7556d113 100644
>> --- a/audio/audio_int.h
>> +++ b/audio/audio_int.h
>> @@ -52,6 +52,7 @@ struct audio_pcm_info {
>>  typedef struct SWVoiceCap SWVoiceCap;
>>  
>>  typedef struct HWVoiceOut {
>> +    AudioState *s;
>>      int enabled;
>>      int poll_mode;
>>      int pending_disable;
>> @@ -73,6 +74,7 @@ typedef struct HWVoiceOut {
>>  } HWVoiceOut;
>>  
>>  typedef struct HWVoiceIn {
>> +    AudioState *s;
>>      int enabled;
>>      int poll_mode;
>>      struct audio_pcm_info info;
>> @@ -94,6 +96,7 @@ typedef struct HWVoiceIn {
>>  
>>  struct SWVoiceOut {
>>      QEMUSoundCard *card;
>> +    AudioState *s;
>>      struct audio_pcm_info info;
>>      t_sample *conv;
>>      int64_t ratio;
>> @@ -111,6 +114,7 @@ struct SWVoiceOut {
>>  
>>  struct SWVoiceIn {
>>      QEMUSoundCard *card;
>> +    AudioState *s;
>>      int active;
>>      struct audio_pcm_info info;
>>      int64_t ratio;
>> @@ -188,6 +192,9 @@ struct AudioState {
>>      int nb_hw_voices_in;
>>      int vm_running;
>>      int64_t period_ticks;
>> +
>> +    bool timer_running;
>> +    uint64_t timer_last;
>>  };
>>  
>>  extern const struct mixeng_volume nominal_volume;
>> diff --git a/audio/audio_template.h b/audio/audio_template.h
>> index c1d7207abd..ccf6d810f7 100644
>> --- a/audio/audio_template.h
>> +++ b/audio/audio_template.h
>> @@ -36,9 +36,9 @@
>>  #define HWBUF hw->conv_buf
>>  #endif
>>  
>> -static void glue (audio_init_nb_voices_, TYPE) (struct audio_driver *drv)
>> +static void glue(audio_init_nb_voices_, TYPE)(AudioState *s,
>> +                                              struct audio_driver *drv)
>>  {
>> -    AudioState *s = &glob_audio_state;
>>      int max_voices = glue (drv->max_voices_, TYPE);
>>      int voice_size = glue (drv->voice_size_, TYPE);
>>  
>> @@ -183,8 +183,8 @@ static void glue (audio_pcm_hw_del_sw_, TYPE) (SW *sw)
>>  
>>  static void glue (audio_pcm_hw_gc_, TYPE) (HW **hwp)
>>  {
>> -    AudioState *s = &glob_audio_state;
>>      HW *hw = *hwp;
>> +    AudioState *s = hw->s;
>>  
>>      if (!hw->sw_head.lh_first) {
>>  #ifdef DAC
>> @@ -199,15 +199,14 @@ static void glue (audio_pcm_hw_gc_, TYPE) (HW **hwp)
>>      }
>>  }
>>  
>> -static HW *glue (audio_pcm_hw_find_any_, TYPE) (HW *hw)
>> +static HW *glue(audio_pcm_hw_find_any_, TYPE)(AudioState *s, HW *hw)
>>  {
>> -    AudioState *s = &glob_audio_state;
>>      return hw ? hw->entries.le_next : glue (s->hw_head_, TYPE).lh_first;
>>  }
>>  
>> -static HW *glue (audio_pcm_hw_find_any_enabled_, TYPE) (HW *hw)
>> +static HW *glue(audio_pcm_hw_find_any_enabled_, TYPE)(AudioState *s, HW *hw)
>>  {
>> -    while ((hw = glue (audio_pcm_hw_find_any_, TYPE) (hw))) {
>> +    while ((hw = glue(audio_pcm_hw_find_any_, TYPE)(s, hw))) {
>>          if (hw->enabled) {
>>              return hw;
>>          }
>> @@ -215,12 +214,10 @@ static HW *glue (audio_pcm_hw_find_any_enabled_, TYPE) (HW *hw)
>>      return NULL;
>>  }
>>  
>> -static HW *glue (audio_pcm_hw_find_specific_, TYPE) (
>> -    HW *hw,
>> -    struct audsettings *as
>> -    )
>> +static HW *glue(audio_pcm_hw_find_specific_, TYPE)(AudioState *s, HW *hw,
>> +                                                   struct audsettings *as)
>>  {
>> -    while ((hw = glue (audio_pcm_hw_find_any_, TYPE) (hw))) {
>> +    while ((hw = glue(audio_pcm_hw_find_any_, TYPE)(s, hw))) {
>>          if (audio_pcm_info_eq (&hw->info, as)) {
>>              return hw;
>>          }
>> @@ -228,10 +225,10 @@ static HW *glue (audio_pcm_hw_find_specific_, TYPE) (
>>      return NULL;
>>  }
>>  
>> -static HW *glue (audio_pcm_hw_add_new_, TYPE) (struct audsettings *as)
>> +static HW *glue(audio_pcm_hw_add_new_, TYPE)(AudioState *s,
>> +                                             struct audsettings *as)
>>  {
>>      HW *hw;
>> -    AudioState *s = &glob_audio_state;
>>      struct audio_driver *drv = s->drv;
>>  
>>      if (!glue (s->nb_hw_voices_, TYPE)) {
>> @@ -255,6 +252,7 @@ static HW *glue (audio_pcm_hw_add_new_, TYPE) (struct audsettings *as)
>>          return NULL;
>>      }
>>  
>> +    hw->s = s;
>>      hw->pcm_ops = drv->pcm_ops;
>>      hw->ctl_caps = drv->ctl_caps;
>>  
>> @@ -299,33 +297,33 @@ static HW *glue (audio_pcm_hw_add_new_, TYPE) (struct audsettings *as)
>>      return NULL;
>>  }
>>  
>> -static HW *glue (audio_pcm_hw_add_, TYPE) (struct audsettings *as)
>> +static HW *glue(audio_pcm_hw_add_, TYPE)(AudioState *s, struct audsettings *as)
>>  {
>>      HW *hw;
>> -    AudioState *s = &glob_audio_state;
>>      AudiodevPerDirectionOptions *pdo = s->dev->TYPE;
>>  
>>      if (pdo->fixed_settings) {
>> -        hw = glue (audio_pcm_hw_add_new_, TYPE) (as);
>> +        hw = glue(audio_pcm_hw_add_new_, TYPE)(s, as);
>>          if (hw) {
>>              return hw;
>>          }
>>      }
>>  
>> -    hw = glue (audio_pcm_hw_find_specific_, TYPE) (NULL, as);
>> +    hw = glue(audio_pcm_hw_find_specific_, TYPE)(s, NULL, as);
>>      if (hw) {
>>          return hw;
>>      }
>>  
>> -    hw = glue (audio_pcm_hw_add_new_, TYPE) (as);
>> +    hw = glue(audio_pcm_hw_add_new_, TYPE)(s, as);
>>      if (hw) {
>>          return hw;
>>      }
>>  
>> -    return glue (audio_pcm_hw_find_any_, TYPE) (NULL);
>> +    return glue(audio_pcm_hw_find_any_, TYPE)(s, NULL);
>>  }
>>  
>> -static SW *glue (audio_pcm_create_voice_pair_, TYPE) (
>> +static SW *glue(audio_pcm_create_voice_pair_, TYPE)(
>> +    AudioState *s,
>>      const char *sw_name,
>>      struct audsettings *as
>>      )
>> @@ -333,7 +331,6 @@ static SW *glue (audio_pcm_create_voice_pair_, TYPE) (
>>      SW *sw;
>>      HW *hw;
>>      struct audsettings hw_as;
>> -    AudioState *s = &glob_audio_state;
>>      AudiodevPerDirectionOptions *pdo = s->dev->TYPE;
>>  
>>      if (pdo->fixed_settings) {
>> @@ -349,8 +346,9 @@ static SW *glue (audio_pcm_create_voice_pair_, TYPE) (
>>                 sw_name ? sw_name : "unknown", sizeof (*sw));
>>          goto err1;
>>      }
>> +    sw->s = s;
>>  
>> -    hw = glue (audio_pcm_hw_add_, TYPE) (&hw_as);
>> +    hw = glue(audio_pcm_hw_add_, TYPE)(s, &hw_as);
>>      if (!hw) {
>>          goto err2;
>>      }
>> @@ -447,7 +445,7 @@ SW *glue (AUD_open_, TYPE) (
>>          }
>>      }
>>      else {
>> -        sw = glue (audio_pcm_create_voice_pair_, TYPE) (name, as);
>> +        sw = glue(audio_pcm_create_voice_pair_, TYPE)(s, name, as);
>>          if (!sw) {
>>              dolog ("Failed to create voice `%s'\n", name);
>>              return NULL;
>> diff --git a/audio/audio.c b/audio/audio.c
>> index 77bd8386d0..ef8ce3b91d 100644
>> --- a/audio/audio.c
>> +++ b/audio/audio.c
>> @@ -397,12 +397,10 @@ static void noop_conv (struct st_sample *dst, const void *src, int samples)
>>      (void) samples;
>>  }
>>  
>> -static CaptureVoiceOut *audio_pcm_capture_find_specific (
>> -    struct audsettings *as
>> -    )
>> +static CaptureVoiceOut *audio_pcm_capture_find_specific(AudioState *s,
>> +                                                        struct audsettings *as)
>>  {
>>      CaptureVoiceOut *cap;
>> -    AudioState *s = &glob_audio_state;
>>  
>>      for (cap = s->cap_head.lh_first; cap; cap = cap->entries.le_next) {
>>          if (audio_pcm_info_eq (&cap->hw.info, as)) {
>> @@ -479,7 +477,7 @@ static void audio_detach_capture (HWVoiceOut *hw)
>>  
>>  static int audio_attach_capture (HWVoiceOut *hw)
>>  {
>> -    AudioState *s = &glob_audio_state;
>> +    AudioState *s = hw->s;
>>      CaptureVoiceOut *cap;
>>  
>>      audio_detach_capture (hw);
>> @@ -792,19 +790,15 @@ static void audio_pcm_print_info (const char *cap, struct audio_pcm_info *info)
>>  /*
>>   * Timer
>>   */
>> -
>> -static bool audio_timer_running;
>> -static uint64_t audio_timer_last;
>> -
>> -static int audio_is_timer_needed (void)
>> +static int audio_is_timer_needed(AudioState *s)
>>  {
>>      HWVoiceIn *hwi = NULL;
>>      HWVoiceOut *hwo = NULL;
>>  
>> -    while ((hwo = audio_pcm_hw_find_any_enabled_out (hwo))) {
>> +    while ((hwo = audio_pcm_hw_find_any_enabled_out(s, hwo))) {
>>          if (!hwo->poll_mode) return 1;
>>      }
>> -    while ((hwi = audio_pcm_hw_find_any_enabled_in (hwi))) {
>> +    while ((hwi = audio_pcm_hw_find_any_enabled_in(s, hwi))) {
>>          if (!hwi->poll_mode) return 1;
>>      }
>>      return 0;
>> @@ -812,18 +806,18 @@ static int audio_is_timer_needed (void)
>>  
>>  static void audio_reset_timer (AudioState *s)
>>  {
>> -    if (audio_is_timer_needed ()) {
>> +    if (audio_is_timer_needed(s)) {
>>          timer_mod_anticipate_ns(s->ts,
>>              qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + s->period_ticks);
>> -        if (!audio_timer_running) {
>> -            audio_timer_running = true;
>> -            audio_timer_last = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
>> +        if (!s->timer_running) {
>> +            s->timer_running = true;
>> +            s->timer_last = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
>>              trace_audio_timer_start(s->period_ticks / SCALE_MS);
>>          }
>>      } else {
>>          timer_del(s->ts);
>> -        if (audio_timer_running) {
>> -            audio_timer_running = false;
>> +        if (s->timer_running) {
>> +            s->timer_running = false;
>>              trace_audio_timer_stop();
>>          }
>>      }
>> @@ -835,11 +829,11 @@ static void audio_timer (void *opaque)
>>      AudioState *s = opaque;
>>  
>>      now = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
>> -    diff = now - audio_timer_last;
>> +    diff = now - s->timer_last;
>>      if (diff > s->period_ticks * 3 / 2) {
>>          trace_audio_timer_delayed(diff / SCALE_MS);
>>      }
>> -    audio_timer_last = now;
>> +    s->timer_last = now;
>>  
>>      audio_run("timer");
>>      audio_reset_timer(s);
>> @@ -893,7 +887,7 @@ void AUD_set_active_out (SWVoiceOut *sw, int on)
>>  
>>      hw = sw->hw;
>>      if (sw->active != on) {
>> -        AudioState *s = &glob_audio_state;
>> +        AudioState *s = sw->s;
>>          SWVoiceOut *temp_sw;
>>          SWVoiceCap *sc;
>>  
>> @@ -940,7 +934,7 @@ void AUD_set_active_in (SWVoiceIn *sw, int on)
>>  
>>      hw = sw->hw;
>>      if (sw->active != on) {
>> -        AudioState *s = &glob_audio_state;
>> +        AudioState *s = sw->s;
>>          SWVoiceIn *temp_sw;
>>  
>>          if (on) {
>> @@ -1063,7 +1057,7 @@ static void audio_run_out (AudioState *s)
>>      HWVoiceOut *hw = NULL;
>>      SWVoiceOut *sw;
>>  
>> -    while ((hw = audio_pcm_hw_find_any_enabled_out (hw))) {
>> +    while ((hw = audio_pcm_hw_find_any_enabled_out(s, hw))) {
>>          int played;
>>          int live, free, nb_live, cleanup_required, prev_rpos;
>>  
>> @@ -1168,7 +1162,7 @@ static void audio_run_in (AudioState *s)
>>  {
>>      HWVoiceIn *hw = NULL;
>>  
>> -    while ((hw = audio_pcm_hw_find_any_enabled_in (hw))) {
>> +    while ((hw = audio_pcm_hw_find_any_enabled_in(s, hw))) {
>>          SWVoiceIn *sw;
>>          int captured = 0, min;
>>  
>> @@ -1274,8 +1268,8 @@ static int audio_driver_init(AudioState *s, struct audio_driver *drv,
>>      s->drv_opaque = drv->init(dev);
>>  
>>      if (s->drv_opaque) {
>> -        audio_init_nb_voices_out (drv);
>> -        audio_init_nb_voices_in (drv);
>> +        audio_init_nb_voices_out(s, drv);
>> +        audio_init_nb_voices_in(s, drv);
>>          s->drv = drv;
>>          return 0;
>>      }
>> @@ -1294,11 +1288,11 @@ static void audio_vm_change_state_handler (void *opaque, int running,
>>      int op = running ? VOICE_ENABLE : VOICE_DISABLE;
>>  
>>      s->vm_running = running;
>> -    while ((hwo = audio_pcm_hw_find_any_enabled_out (hwo))) {
>> +    while ((hwo = audio_pcm_hw_find_any_enabled_out(s, hwo))) {
>>          hwo->pcm_ops->ctl_out(hwo, op);
>>      }
>>  
>> -    while ((hwi = audio_pcm_hw_find_any_enabled_in (hwi))) {
>> +    while ((hwi = audio_pcm_hw_find_any_enabled_in(s, hwi))) {
>>          hwi->pcm_ops->ctl_in(hwi, op);
>>      }
>>      audio_reset_timer (s);
>> @@ -1318,7 +1312,7 @@ void audio_cleanup(void)
>>      HWVoiceIn *hwi, *hwin;
>>  
>>      is_cleaning_up = true;
>> -    QLIST_FOREACH_SAFE(hwo, &glob_audio_state.hw_head_out, entries, hwon) {
>> +    QLIST_FOREACH_SAFE(hwo, &s->hw_head_out, entries, hwon) {
>>          SWVoiceCap *sc;
>>  
>>          if (hwo->enabled) {
>> @@ -1337,7 +1331,7 @@ void audio_cleanup(void)
>>          QLIST_REMOVE(hwo, entries);
>>      }
>>  
>> -    QLIST_FOREACH_SAFE(hwi, &glob_audio_state.hw_head_in, entries, hwin) {
>> +    QLIST_FOREACH_SAFE(hwi, &s->hw_head_in, entries, hwin) {
>>          if (hwi->enabled) {
>>              hwi->pcm_ops->ctl_in (hwi, VOICE_DISABLE);
>>          }
>> @@ -1537,7 +1531,7 @@ CaptureVoiceOut *AUD_add_capture (
>>      cb->ops = *ops;
>>      cb->opaque = cb_opaque;
>>  
>> -    cap = audio_pcm_capture_find_specific (as);
>> +    cap = audio_pcm_capture_find_specific(s, as);
>>      if (cap) {
>>          QLIST_INSERT_HEAD (&cap->cb_head, cb, entries);
>>          return cap;
>> @@ -1554,6 +1548,7 @@ CaptureVoiceOut *AUD_add_capture (
>>          }
>>  
>>          hw = &cap->hw;
>> +        hw->s = s;
>>          QLIST_INIT (&hw->sw_head);
>>          QLIST_INIT (&cap->cb_head);
>>  
>> @@ -1586,7 +1581,7 @@ CaptureVoiceOut *AUD_add_capture (
>>          QLIST_INSERT_HEAD (&s->cap_head, cap, entries);
>>          QLIST_INSERT_HEAD (&cap->cb_head, cb, entries);
>>  
>> -        QLIST_FOREACH(hw, &glob_audio_state.hw_head_out, entries) {
>> +        QLIST_FOREACH(hw, &s->hw_head_out, entries) {
>>              audio_attach_capture (hw);
>>          }
>>          return cap;
>> -- 
>> 2.20.1
>>