bulgarian: Change some USB-related voice strings

Change-Id: I4c129b3672b6ffa21a8f11ca1146ffa4933474d5

apps/beep.c

@@ -97,7 +97,7 @@ void beep_play(unsigned int frequency, unsigned int duration,
     beep_get_more(&start, &size);
 
     mixer_channel_set_amplitude(PCM_MIXER_CHAN_BEEP, MIX_AMP_UNITY);
-    mixer_channel_play_data(PCM_MIXER_CHAN_BEEP,
-                            beep_count ? beep_get_more : NULL,
-                            start, size);
+    static struct mixer_play_cbs cbs;
+    cbs.get_more = beep_count ? beep_get_more : NULL;
+    mixer_channel_play_data(PCM_MIXER_CHAN_BEEP, &cbs, start, size);
 }

apps/codec_thread.c

@@ -26,6 +26,7 @@
 #include "kernel.h"
 #include "codecs.h"
 #include "codec_thread.h"
+#include "pcm_mixer.h"
 #include "pcmbuf.h"
 #include "audio_thread.h"
 #include "playback.h"
@@ -518,7 +519,7 @@ static void run_codec(void)
     codec_queue_ack(Q_CODEC_RUN);
 
     trigger_cpu_boost();
-    dsp_configure(ci.dsp, DSP_SET_OUT_FREQUENCY, pcmbuf_get_frequency());
+    dsp_configure(ci.dsp, DSP_SET_OUT_FREQUENCY, mixer_get_frequency());
 
     if (!encoder)
     {

apps/lang/bulgarian.lang

@@ -5902,7 +5902,7 @@
   </dest>
   <voice>
     *: none
-    hibylinux: "~U S B"
+    hibylinux: "Ю Ес Би"
     multivolume: "~H D 1"
     sansac200*,sansaclipplus,sansae200*,sansafuze*: "микро S D"
     xduoox3: "микро S D 2"
@@ -7004,7 +7004,7 @@
   </dest>
   <voice>
     *: none
-    usb_charging_enable: "Зареждане по време на USB връзка"
+    usb_charging_enable: "Зареждане по време на Ю Ес Би връзка"
   </voice>
 </phrase>
 <phrase>
@@ -10103,7 +10103,7 @@
   </dest>
   <voice>
     *: none
-    usb_hid: "Режим USB клавиатура"
+    usb_hid: "Режим Ю Ес Би клавиатура"
   </voice>
 </phrase>
 <phrase>
@@ -10490,11 +10490,11 @@
   </source>
   <dest>
     *: none
-    usb_hid: "USB УЧИ"
+    usb_hid: "USB у-во за човешки интерфейс"
   </dest>
   <voice>
     *: none
-    usb_hid: "USB устройство за човешки интерфейс"
+    usb_hid: "Ю Ес Би устройство за човешки интерфейс"
   </voice>
 </phrase>
 <phrase>
@@ -11230,7 +11230,7 @@
   </dest>
   <voice>
     *: none
-    multidrive_usb: "USB скриване на вътрешната памет"
+    multidrive_usb: "Ю Ес Би скриване на вътрешната памет"
   </voice>
 </phrase>
 <phrase>
@@ -15080,7 +15080,7 @@
     *: "Влез в режим USB памет?"
   </dest>
   <voice>
-    *: "Влез в режим USB памет?"
+    *: "Влез в режим Ю Ес Би памет?"
   </voice>
 </phrase>
 <phrase>
@@ -16873,11 +16873,11 @@
   </source>
   <dest>
     *: none
-    usbdac: "USB-ЦАП"
+    usbdac: "USB ЦАП"
   </dest>
   <voice>
     *: none
-    usbdac: "USB ЦАП"
+    usbdac: "Ю Ес Би цифрово-аналогов преобразувател"
   </voice>
 </phrase>
 <phrase>
@@ -16894,7 +16894,7 @@
   </dest>
   <voice>
     *: none
-    usbdac: "В режим USB само зареждане"
+    usbdac: "В режим Ю Ес Би само зареждане"
   </voice>
 </phrase>
 <phrase>
@@ -16911,7 +16911,7 @@
   </dest>
   <voice>
     *: none
-    usbdac: "В режим USB памет"
+    usbdac: "В режим Ю Ес Би памет"
   </voice>
 </phrase>
 <phrase>
@@ -16924,11 +16924,11 @@
   </source>
   <dest>
     *: none
-    usbdac: "USB-ЦАП е активен"
+    usbdac: "USB ЦАП е активен"
   </dest>
   <voice>
     *: none
-    usbdac: "USB ЦАП е активен"
+    usbdac: "Ю Ес Би цифрово-аналогов преобразувател е активен"
   </voice>
 </phrase>
 <phrase>

apps/pcmbuf.c

@@ -29,6 +29,7 @@
 #include "pcmbuf.h"
 #include "dsp-util.h"
 #include "playback.h"
+#include "dsp_core.h"
 #include "codec_thread.h"
 
 /* Define LOGF_ENABLE to enable logf output in this file */
@@ -68,17 +69,20 @@
    chunks */
 
 /* Return data level in 1/4-second increments */
-#define DATA_LEVEL(quarter_secs) (pcmbuf_sampr * (quarter_secs))
+static inline unsigned int data_level(int quarter_secs)
+{
+    return mixer_get_frequency() * quarter_secs;
+}
 
 /* Number of bytes played per second */
-#define BYTERATE            (pcmbuf_sampr * PCMBUF_SAMPLE_SIZE)
+#define BYTERATE            (mixer_get_frequency() * PCMBUF_SAMPLE_SIZE)
 
 #if MEMORYSIZE > 2
 /* Keep watermark high for large memory target - at least (2s) */
 #define PCMBUF_WATERMARK    (BYTERATE * 2)
 #define MIN_BUFFER_SIZE     (BYTERATE * 3)
 /* 1 seconds of buffer is low data */
-#define LOW_DATA            DATA_LEVEL(4)
+#define LOW_DATA            data_level(4)
 #else
 #define PCMBUF_WATERMARK    (BYTERATE / 4)  /* 0.25 seconds */
 #define MIN_BUFFER_SIZE     (BYTERATE * 1)
@@ -108,7 +112,6 @@ static size_t pcmbuf_size;
 static struct chunkdesc *pcmbuf_descriptors;
 static unsigned int pcmbuf_desc_count;
 static unsigned int position_key = 1;
-static unsigned int pcmbuf_sampr = 0;
 
 static size_t chunk_ridx;
 static size_t chunk_widx;
@@ -481,7 +484,7 @@ void * pcmbuf_request_buffer(int *count)
         if (low_latency_mode)
         {
             /* 1/4s latency. */
-            if (remaining > DATA_LEVEL(1))
+            if (remaining > data_level(1))
                 return NULL;
         }
 
@@ -723,7 +726,7 @@ void pcmbuf_start_track_change(enum pcm_track_change_type type)
     else if (crossfade_setting != CROSSFADE_ENABLE_OFF)
     {
         if (crossfade_status == CROSSFADE_INACTIVE &&
-            pcmbuf_unplayed_bytes() >= DATA_LEVEL(2) &&
+            pcmbuf_unplayed_bytes() >= data_level(2) &&
             !low_latency_mode)
         {
             switch (crossfade_setting)
@@ -836,6 +839,12 @@ static void pcmbuf_pcm_callback(const void **start, size_t *size)
     }
 }
 
+static void pcmbuf_sampr_callback(uint32_t sampr)
+{
+    struct dsp_config* dsp = dsp_get_config(CODEC_IDX_AUDIO);
+    dsp_configure(dsp, DSP_SET_OUT_FREQUENCY, sampr);
+}
+
 /* Force playback */
 void pcmbuf_play_start(void)
 {
@@ -845,8 +854,11 @@ void pcmbuf_play_start(void)
         chunk_widx != chunk_ridx)
     {
         current_desc = NULL;
-        mixer_channel_play_data(PCM_MIXER_CHAN_PLAYBACK, pcmbuf_pcm_callback,
-                                NULL, 0);
+        static const struct mixer_play_cbs cbs = {
+            .get_more = pcmbuf_pcm_callback,
+            .sampr_changed = pcmbuf_sampr_callback,
+        };
+        mixer_channel_play_data(PCM_MIXER_CHAN_PLAYBACK, &cbs, NULL, 0);
     }
 }
 
@@ -1141,7 +1153,7 @@ static void crossfade_start(void)
     size_t unplayed = pcmbuf_unplayed_bytes();
 
     /* Reject crossfade if less than .5s of data */
-    if (unplayed < DATA_LEVEL(2))
+    if (unplayed < data_level(2))
     {
         logf("crossfade rejected");
         crossfade_cancel();
@@ -1437,13 +1449,3 @@ void pcmbuf_set_low_latency(bool state)
 {
     low_latency_mode = state;
 }
-
-void pcmbuf_update_frequency(void)
-{
-    pcmbuf_sampr = mixer_get_frequency();
-}
-
-unsigned int pcmbuf_get_frequency(void)
-{
-    return pcmbuf_sampr;
-}

apps/pcmbuf.h

@@ -80,7 +80,5 @@ void pcmbuf_sync_position_update(void);
 /* Misc */
 bool pcmbuf_is_lowdata(void);
 void pcmbuf_set_low_latency(bool state);
-void pcmbuf_update_frequency(void);
-unsigned int pcmbuf_get_frequency(void);
 
 #endif /* PCMBUF_H */

apps/playback.c

@@ -3036,7 +3036,6 @@ static void audio_start_playback(const struct audio_resume_info *resume_info,
             skip_resume_adjustments = id3_get(PLAYING_ID3)->skip_resume_adjustments;
 
             track_list_clear(TRACK_LIST_CLEAR_ALL);
-            pcmbuf_update_frequency();
         }
         else
         {
@@ -3049,7 +3048,6 @@ static void audio_start_playback(const struct audio_resume_info *resume_info,
             pcmbuf_start_track_change(TRACK_CHANGE_MANUAL);
             wipe_track_metadata(true);
         }
-        pcmbuf_update_frequency();
 
         /* Set after track finish event in case skip was in progress */
         skip_pending = TRACK_SKIP_NONE;
@@ -3071,7 +3069,6 @@ static void audio_start_playback(const struct audio_resume_info *resume_info,
 #ifndef PLATFORM_HAS_VOLUME_CHANGE
         sound_set_volume(global_status.volume);
 #endif
-        pcmbuf_update_frequency();
 
         /* Be sure channel is audible */
         pcmbuf_fade(false, true);
@@ -4315,7 +4312,6 @@ void INIT_ATTR playback_init(void)
     mutex_init(&id3_mutex);
     track_list_init();
     buffering_init();
-    pcmbuf_update_frequency();
 #ifdef HAVE_CROSSFADE
     /* Set crossfade setting for next buffer init which should be about... */
     pcmbuf_request_crossfade_enable(global_settings.crossfade);

apps/plugin.h

@@ -179,7 +179,7 @@ int plugin_open(const char *plugin, const char *parameter);
  * when this happens please take the opportunity to sort in
  * any new functions "waiting" at the end of the list.
  */
-#define PLUGIN_API_VERSION 281
+#define PLUGIN_API_VERSION 282
 
 /* 239 Marks the removal of ARCHOS HWCODEC and CHARCELL */
 
@@ -782,7 +782,7 @@ struct plugin_api {
     void (*mixer_channel_calculate_peaks)(enum pcm_mixer_channel channel,
                                           struct pcm_peaks *peaks);
     void (*mixer_channel_play_data)(enum pcm_mixer_channel channel,
-                                    pcm_play_callback_type get_more,
+                                    const struct mixer_play_cbs* cbs,
                                     const void *start, size_t size);
     void (*mixer_channel_play_pause)(enum pcm_mixer_channel channel, bool play);
     void (*mixer_channel_stop)(enum pcm_mixer_channel channel);
@@ -790,7 +790,7 @@ struct plugin_api {
                                         unsigned int amplitude);
     size_t (*mixer_channel_get_bytes_waiting)(enum pcm_mixer_channel channel);
     void (*mixer_channel_set_buffer_hook)(enum pcm_mixer_channel channel,
-                                          chan_buffer_hook_fn_type fn);
+                                          const struct mixer_buffer_cbs* cbs);
     void (*mixer_set_frequency)(unsigned int samplerate);
     unsigned int (*mixer_get_frequency)(void);
     void (*pcmbuf_fade)(bool fade, bool in);

apps/plugins/doom/i_sound.c

@@ -466,7 +466,10 @@ void I_SubmitSound(void)
    if (!enable_sound)
       return;
 
-   rb->mixer_channel_play_data(PCM_MIXER_CHAN_PLAYBACK, &get_more, NULL, 0);
+   static const struct mixer_play_cbs cbs = {
+       .get_more = get_more,
+   };
+   rb->mixer_channel_play_data(PCM_MIXER_CHAN_PLAYBACK, &cbs, NULL, 0);
 }
 
 void I_ShutdownSound(void)

apps/plugins/midi/midiplay.c

@@ -507,6 +507,10 @@ UNUSED_ATTR static int find_min_sampr_ge_22(void)
     return ret;
 }
 
+static const struct mixer_play_cbs mixer_cbs = {
+    .get_more = get_more,
+};
+
 static int midimain(const void * filename)
 {
     int a, notes_used, vol;
@@ -625,7 +629,7 @@ static int midimain(const void * filename)
 #endif
 
     rb->pcmbuf_fade(false, true);
-    rb->mixer_channel_play_data(PCM_MIXER_CHAN_PLAYBACK, get_more, NULL, 0);
+    rb->mixer_channel_play_data(PCM_MIXER_CHAN_PLAYBACK, &mixer_cbs, NULL, 0);
 
     while (!quit)
     {
@@ -684,7 +688,7 @@ static int midimain(const void * filename)
 #endif
                 midi_debug("Rewind to %d:%02d\n", playing_time/60, playing_time%60);
                 if (is_playing)
-                    rb->mixer_channel_play_data(PCM_MIXER_CHAN_PLAYBACK, get_more, NULL, 0);
+                    rb->mixer_channel_play_data(PCM_MIXER_CHAN_PLAYBACK, &mixer_cbs, NULL, 0);
                 break;
             }
 
@@ -706,7 +710,7 @@ static int midimain(const void * filename)
 #endif
                 midi_debug("Skip to %d:%02d\n", playing_time/60, playing_time%60);
                 if (is_playing)
-                    rb->mixer_channel_play_data(PCM_MIXER_CHAN_PLAYBACK, get_more, NULL, 0);
+                    rb->mixer_channel_play_data(PCM_MIXER_CHAN_PLAYBACK, &mixer_cbs, NULL, 0);
                 break;
             }
 

apps/plugins/mikmod/mikmod.c

@@ -292,6 +292,10 @@ static void get_more(const void** start, size_t* size)
 #endif
 }
 
+static const struct mixer_play_cbs mixer_cbs = {
+    .get_more = get_more,
+};
+
 static void showinfo(void)
 {
     char statustext[LINE_LENGTH];
@@ -600,10 +604,9 @@ static void applysettings(void)
         }
 
         // MikMod_Reset("");  BROKEN!
-
         rb->mixer_channel_stop(PCM_MIXER_CHAN_PLAYBACK);
         rb->mixer_set_frequency(md_mixfreq);
-	rb->mixer_channel_play_data(PCM_MIXER_CHAN_PLAYBACK, get_more, NULL, 0);
+        rb->mixer_channel_play_data(PCM_MIXER_CHAN_PLAYBACK, &mixer_cbs, NULL, 0);
     }
 
 #ifdef HAVE_ADJUSTABLE_CPU_FREQ
@@ -810,7 +813,7 @@ static int playfile(char* filename)
         display = DISPLAY_INFO;
         Player_Start(module);
         rb->pcmbuf_fade(false, true);
-        rb->mixer_channel_play_data(PCM_MIXER_CHAN_PLAYBACK, get_more, NULL, 0);
+        rb->mixer_channel_play_data(PCM_MIXER_CHAN_PLAYBACK, &mixer_cbs, NULL, 0);
     }
 
 #ifdef HAVE_ADJUSTABLE_CPU_FREQ

apps/plugins/mpegplayer/pcm_output.c

@@ -173,6 +173,10 @@ static void get_more(const void **start, size_t *size)
         pcmbuf_read = pcmbuf_written;
 }
 
+static const struct mixer_play_cbs mixer_cbs = {
+    .get_more = get_more,
+};
+
 /** Public interface **/
 
 /* Return a buffer pointer if at least size bytes are available and if so,
@@ -236,8 +240,7 @@ void pcm_output_flush(void)
 
     /* Restart if playing state was current */
     if (status == CHANNEL_PLAYING)
-        rb->mixer_channel_play_data(MPEG_PCM_CHANNEL,
-                                    get_more, NULL, 0);
+        rb->mixer_channel_play_data(MPEG_PCM_CHANNEL, &mixer_cbs, NULL, 0);
 }
 
 /* Seek the reference clock to the specified time - next audio data ready to
@@ -318,8 +321,7 @@ void pcm_output_play_pause(bool play)
         if (play)
         {
             rb->mixer_channel_set_amplitude(MPEG_PCM_CHANNEL, MIX_AMP_UNITY);
-            rb->mixer_channel_play_data(MPEG_PCM_CHANNEL,
-                                        get_more, NULL, 0);
+            rb->mixer_channel_play_data(MPEG_PCM_CHANNEL, &mixer_cbs, NULL, 0);
         }
     }
 }

apps/plugins/oscilloscope.c

@@ -1441,6 +1441,10 @@ static void waveform_buffer_callback(const void *start, size_t size)
     waveform_buffer_have = have + copy;
 }
 
+static const struct mixer_buffer_cbs buf_cbs = {
+    .next_buffer = waveform_buffer_callback,
+};
+
 static void waveform_buffer_reset(void)
 {
     /* only called when callback is off */
@@ -1909,7 +1913,7 @@ static void graphmode_setup(void)
     if (osc.graphmode == GRAPH_WAVEFORM)
     {
         rb->mixer_channel_set_buffer_hook(channel,
-                                          waveform_buffer_callback);
+                                          &buf_cbs);
 #ifdef HAVE_SCHEDULER_BOOSTCTRL
         rb->trigger_cpu_boost(); /* Just looks better */
 #endif
@@ -2013,7 +2017,7 @@ void switch_channel(enum pcm_mixer_channel new_channel)
 
 #ifdef OSCILLOSCOPE_GRAPHMODE
     if (osc.graphmode == GRAPH_WAVEFORM)
-        rb->mixer_channel_set_buffer_hook(channel, waveform_buffer_callback);
+        rb->mixer_channel_set_buffer_hook(channel, &buf_cbs);
 #endif
 }
 #endif /* USB_ENABLE_AUDIO */

apps/plugins/pacbox/pacbox.c

@@ -407,8 +407,11 @@ static void start_sound(void)
 
     wsg3_set_sampling_rate(caps->samprs[sr_index]);
 
+    static const struct mixer_play_cbs cbs = {
+        .get_more = get_more,
+    };
     rb->mixer_set_frequency(caps->samprs[sr_index]);
-    rb->mixer_channel_play_data(PCM_MIXER_CHAN_PLAYBACK, get_more, NULL, 0);
+    rb->mixer_channel_play_data(PCM_MIXER_CHAN_PLAYBACK, &cbs, NULL, 0);
 
     sound_playing = true;
 }

apps/plugins/pdbox/PDa/src/s_audio_rockbox.c

@@ -181,7 +181,10 @@ int rockbox_send_dacs(void)
     if(!playing && outbuf_fill > 0)
     {
         /* Start playing. */
-        rb->mixer_channel_play_data(PCM_MIXER_CHAN_PLAYBACK, pdbox_get_more, NULL, 0);
+        static const struct mixer_play_cbs cbs = {
+            .get_more = pdbox_get_more,
+        };
+        rb->mixer_channel_play_data(PCM_MIXER_CHAN_PLAYBACK, &cbs, NULL, 0);
 
         /* Set status flag. */
         playing = true;

apps/plugins/rockboy/rbsound.c

@@ -73,7 +73,10 @@ int rockboy_pcm_submit(void)
 
     if(newly_started)
     {
-        rb->mixer_channel_play_data(PCM_MIXER_CHAN_PLAYBACK, &get_more, NULL, 0);
+        static const struct mixer_play_cbs cbs = {
+            .get_more = get_more,
+        };
+        rb->mixer_channel_play_data(PCM_MIXER_CHAN_PLAYBACK, &cbs, NULL, 0);
         newly_started = false;
     }
 

apps/plugins/sdl/src/audio/rockbox/SDL_rockboxaudio.c

@@ -288,7 +288,10 @@ static int ROCKBOXAUD_OpenAudio(_THIS, SDL_AudioSpec *spec)
 
     rbaud_underruns = 0;
 
-    rb->mixer_channel_play_data(PCM_MIXER_CHAN_PLAYBACK, get_more, NULL, 0);
+    static const struct mixer_play_cbs cbs = {
+        .get_more = get_more,
+    };
+    rb->mixer_channel_play_data(PCM_MIXER_CHAN_PLAYBACK, &cbs, NULL, 0);
 
     /* We're ready to rock and roll. :-) */
     return(0);

apps/plugins/test_sampr.c

@@ -237,7 +237,10 @@ static void play_tone(bool volume_set)
                                       IF_PRIO(, PRIORITY_PLAYBACK)
                                       IF_COP(, CPU));
 
-    rb->mixer_channel_play_data(PCM_MIXER_CHAN_PLAYBACK, get_more, NULL, 0);
+    static const struct mixer_play_cbs cbs = {
+        .get_more = get_more,
+    };
+    rb->mixer_channel_play_data(PCM_MIXER_CHAN_PLAYBACK, &cbs, NULL, 0);
 
 #ifndef HAVE_VOLUME_IN_LIST
     if (volume_set)

apps/plugins/xrick/system/syssnd_rockbox.c

@@ -222,8 +222,11 @@ void syssnd_update(void)
 
         if (!isAudioPlaying && fillCount > 0)
         {
+            static const struct mixer_play_cbs cbs = {
+                .get_more = get_more,
+            };
             isAudioPlaying = true;
-            rb->mixer_channel_play_data(PCM_MIXER_CHAN_PLAYBACK, get_more, NULL, 0);
+            rb->mixer_channel_play_data(PCM_MIXER_CHAN_PLAYBACK, &cbs, NULL, 0);
         }
     }
 }

apps/plugins/xworld/sys.c

@@ -1029,7 +1029,10 @@ void sys_startAudio(struct System* sys, AudioCallback callback, void *param)
     audio_param = param;
     audio_sys = sys;
 
-    rb->mixer_channel_play_data(PCM_MIXER_CHAN_PLAYBACK, get_more, NULL, 0);
+    static const struct mixer_play_cbs cbs = {
+        .get_more = get_more,
+    };
+    rb->mixer_channel_play_data(PCM_MIXER_CHAN_PLAYBACK, &cbs, NULL, 0);
 }
 
 void sys_stopAudio(struct System* sys)

apps/plugins/zxbox/spsound.c

@@ -212,7 +212,10 @@ static void write_buf(void){
                     = my_buf[j+10] = my_buf[j+11] \
                     = (((byte)sp_sound_buf[i])<<8) >> settings.volume;
 
-    rb->mixer_channel_play_data(PCM_MIXER_CHAN_PLAYBACK, get_more, (unsigned char*)(my_buf),TMNUM*4*3*2);
+    static const struct mixer_play_cbs cbs = {
+        .get_more = get_more,
+    };
+    rb->mixer_channel_play_data(PCM_MIXER_CHAN_PLAYBACK, &cbs, (unsigned char*)(my_buf),TMNUM*4*3*2);
 
 #if 0
     /* can use to save and later analyze what we produce */

apps/voice_thread.c

@@ -245,8 +245,10 @@ static void voice_start_playback(void)
     struct voice_pcm_frame *frame =
         &voice_buf->frames[voice_buf->frame_out % VOICE_FRAMES];
 
-    mixer_channel_play_data(PCM_MIXER_CHAN_VOICE, voice_pcm_callback,
-                            frame->pcm, frame->size);
+    static const struct mixer_play_cbs cbs = {
+        .get_more = voice_pcm_callback,
+    };
+    mixer_channel_play_data(PCM_MIXER_CHAN_VOICE, &cbs, frame->pcm, frame->size);
 }
 
 /* Stop the voice channel */

docs/PLUGIN_API

@@ -1607,9 +1607,9 @@ size_t mixer_channel_get_bytes_waiting(enum pcm_mixer_channel channel)
     \return
     \description
 
-void mixer_channel_play_data(enum pcm_mixer_channel channel, pcm_play_callback_type get_more, const void *start, size_t size)
+void mixer_channel_play_data(enum pcm_mixer_channel channel, const struct mixer_play_cbs* cbs, const void *start, size_t size)
     \param channel
-    \param get_more
+    \param cbs
     \param start
     \param size
     \description
@@ -1624,7 +1624,7 @@ void mixer_channel_set_amplitude(enum pcm_mixer_channel channel, unsigned int am
     \param amplitude
     \description
 
-void mixer_channel_set_buffer_hook(enum pcm_mixer_channel channel, chan_buffer_hook_fn_type fn)
+void mixer_channel_set_buffer_hook(enum pcm_mixer_channel channel, const struct mixer_buffer_cbs* cbs)
     \param channel
     \param fn
     \description

firmware/export/pcm_mixer.h

@@ -96,8 +96,13 @@ enum channel_status
 /** Public interfaces **/
 
 /* Start playback on a channel */
+struct mixer_play_cbs {
+    void (*get_more)(const void **start, size_t *size);
+    void (*sampr_changed)(uint32_t sampr);
+};
+
 void mixer_channel_play_data(enum pcm_mixer_channel channel,
-                             pcm_play_callback_type get_more,
+                             const struct mixer_play_cbs* cbs,
                              const void *start, size_t size);
 
 /* Pause or resume a channel (when started) */
@@ -128,12 +133,15 @@ void mixer_channel_calculate_peaks(enum pcm_mixer_channel channel,
 void mixer_adjust_channel_address(enum pcm_mixer_channel channel,
                                   off_t offset);
 
-/* Set a hook that is called upon getting a new source buffer for a channel
-   NOTE: Called for each buffer, not each mixer chunk */
-typedef void (*chan_buffer_hook_fn_type)(const void *start, size_t size);
+struct mixer_buffer_cbs {
+    /* Called for each buffer, not each mixer chunk */
+    void (*next_buffer)(const void *start, size_t size);
+    void (*sampr_changed)(uint32_t sampr);
+};
 
+/* Set a hook that is called upon getting a new source buffer for a channel */
 void mixer_channel_set_buffer_hook(enum pcm_mixer_channel channel,
-                                   chan_buffer_hook_fn_type fn);
+                                   const struct mixer_buffer_cbs* cbs);
 
 /* Stop ALL channels and PCM and reset state */
 void mixer_reset(void);

firmware/pcm_mixer.c

@@ -33,7 +33,6 @@
    before the last samples are sent to the codec and so things are done in
    parallel (as much as possible) with sending-out data. */
 
-static unsigned int mixer_sampr = -1U;
 static unsigned int mix_frame_size = MIX_FRAME_SAMPLES*4;
 
 /* Define this to nonzero to add a marker pulse at each frame start */
@@ -45,10 +44,10 @@ struct mixer_channel
     const void *start;                      /* Buffer pointer */
     size_t size;                            /* Bytes remaining */
     size_t last_size;                       /* Size of consumed data in prev. cycle */
-    pcm_play_callback_type get_more; /* Registered callback */
+    const struct mixer_play_cbs* play_cbs;  /* Registered callbacks */
     enum channel_status status;             /* Playback status */
     uint32_t amplitude;                     /* Amp. factor: 0x0000 = mute, 0x10000 = unity */
-    chan_buffer_hook_fn_type buffer_hook; /* Callback for new buffer */
+    const struct mixer_buffer_cbs* buf_cbs; /* Callback for new buffer */
 };
 
 #if (defined(HW_HAVE_192) || defined(HW_HAVE_176))
@@ -75,9 +74,19 @@ static struct mixer_channel channels[PCM_MIXER_NUM_CHANNELS] IBSS_ATTR;
 static struct mixer_channel * active_channels[PCM_MIXER_NUM_CHANNELS+1] IBSS_ATTR;
 
 /* Number of silence frames to play after all data has played */
-#define MAX_IDLE_FRAMES     (mixer_sampr*3 / (mix_frame_size / 4))
 static unsigned int idle_counter = 0;
 
+#ifdef CONFIG_SAMPR_TYPES
+#define SAMPR_NUM(sampr) (sampr & ~SAMPR_TYPE_MASK)
+#else
+#define SAMPR_NUM(sampr) (sampr)
+#endif
+
+static inline unsigned int max_idle_frames(void)
+{
+    return SAMPR_NUM(pcm_get_frequency()) * 3 / (mix_frame_size / 4);
+}
+
 /** Mixing routines, CPU optmized **/
 #include "asm/pcm-mixer.c"
 
@@ -119,8 +128,8 @@ static void mixer_pcm_callback(const void **addr, size_t *size)
 
 static inline void chan_call_buffer_hook(struct mixer_channel *chan)
 {
-    if (UNLIKELY(chan->buffer_hook))
-        chan->buffer_hook(chan->start, chan->size);
+    if (UNLIKELY(chan->buf_cbs && chan->buf_cbs->next_buffer))
+        chan->buf_cbs->next_buffer(chan->start, chan->size);
 }
 
 /* Buffering callback - calls sub-callbacks and mixes the data for next
@@ -154,9 +163,9 @@ fill_frame:
 
         if (chan->size == 0)
         {
-            if (chan->get_more)
+            if (chan->play_cbs->get_more)
             {
-                chan->get_more(&chan->start, &chan->size);
+                chan->play_cbs->get_more(&chan->start, &chan->size);
                 ALIGN_AUDIOBUF(chan->start, chan->size);
             }
 
@@ -233,7 +242,7 @@ fill_frame:
             goto fill_frame;
         }
     }
-    else if (idle_counter++ < MAX_IDLE_FRAMES)
+    else if (idle_counter++ < max_idle_frames())
     {
         /* Pad incomplete frames with silence */
         if (idle_counter <= 3)
@@ -265,12 +274,6 @@ static void mixer_start_pcm(void)
         return;
 #endif
 
-    /* Requires a shared global sample rate for all channels */
-    if (mixer_sampr == -1U)
-        mixer_sampr = pcm_get_frequency();
-    else
-        pcm_set_frequency(mixer_sampr);
-
     /* Prepare initial frames and set up the double buffer */
     mixer_buffer_callback(PCM_DMAST_STARTED);
 
@@ -287,14 +290,14 @@ static void mixer_start_pcm(void)
 
 /* Start playback on a channel */
 void mixer_channel_play_data(enum pcm_mixer_channel channel,
-                             pcm_play_callback_type get_more,
+                             const struct mixer_play_cbs* cbs,
                              const void *start, size_t size)
 {
     struct mixer_channel *chan = &channels[channel];
 
     ALIGN_AUDIOBUF(start, size);
 
-    if (!(start && size) && get_more)
+    if (!(start && size) && cbs && cbs->get_more)
     {
         /* Initial buffer not passed - call the callback now */
         pcm_play_lock();
@@ -304,7 +307,7 @@ void mixer_channel_play_data(enum pcm_mixer_channel channel,
         pcm_play_unlock(); /* Allow playback while doing callback */
 
         size = 0;
-        get_more(&start, &size);
+        cbs->get_more(&start, &size);
         ALIGN_AUDIOBUF(start, size);
     }
 
@@ -317,7 +320,7 @@ void mixer_channel_play_data(enum pcm_mixer_channel channel,
         chan->start = start;
         chan->size = size;
         chan->last_size = 0;
-        chan->get_more = get_more;
+        chan->play_cbs = cbs;
 
         mixer_activate_channel(chan);
         chan_call_buffer_hook(chan);
@@ -429,15 +432,14 @@ void mixer_adjust_channel_address(enum pcm_mixer_channel channel,
     pcm_play_unlock();
 }
 
-/* Set a hook that is called upon getting a new source buffer for a channel
-   NOTE: Called for each buffer, not each mixer chunk */
+/* Set a hook that is called upon getting a new source buffer for a channel */
 void mixer_channel_set_buffer_hook(enum pcm_mixer_channel channel,
-                                   chan_buffer_hook_fn_type fn)
+                                   const struct mixer_buffer_cbs* cbs)
 {
     struct mixer_channel *chan = &channels[channel];
 
     pcm_play_lock();
-    chan->buffer_hook = fn;
+    chan->buf_cbs = cbs;
     pcm_play_unlock();
 }
 
@@ -455,24 +457,51 @@ void mixer_reset(void)
 /* Set output samplerate */
 void mixer_set_frequency(unsigned int samplerate)
 {
-    pcm_set_frequency(samplerate);
-    samplerate = pcm_get_frequency();
-
-#ifdef CONFIG_SAMPR_TYPES
-    samplerate &= ~SAMPR_TYPE_MASK;
-#endif
-
-    if (samplerate == mixer_sampr)
+    if(pcm_get_frequency() == samplerate)
         return;
 
-    /* All data is now invalid */
-    mixer_reset();
-    mixer_sampr = samplerate;
+    pcm_set_frequency(samplerate);
+
+    for (size_t i = 0; i < ARRAYLEN(active_channels) && active_channels[i]; i += 1)
+    {
+        struct mixer_channel* chan = active_channels[i];
+
+        /* Notify upstreams */
+        if (chan->play_cbs)
+        {
+            if (chan->play_cbs->sampr_changed)
+            {
+                chan->play_cbs->sampr_changed(SAMPR_NUM(samplerate));
+            }
+            if (chan->play_cbs->get_more)
+            {
+                /* Remake buffer */
+                const void *start = NULL;
+                size_t size;
+                chan->play_cbs->get_more(&start, &size);
+                if (start && size) {
+                    chan->start = start;
+                    chan->size = size;
+                    chan->last_size = 0;
+                } else {
+                    channel_stopped(chan);
+                }
+            }
+        }
+        /* Notify buffer monitor */
+        if (chan->buf_cbs)
+        {
+            if (chan->buf_cbs->sampr_changed)
+            {
+                chan->buf_cbs->sampr_changed(SAMPR_NUM(samplerate));
+            }
+        }
+    }
 
     /* Work out how much space we really need */
-    if (samplerate > SAMPR_96)
+    if (SAMPR_NUM(samplerate) > SAMPR_96)
         mix_frame_size = 4;
-    else if (samplerate > SAMPR_48)
+    else if (SAMPR_NUM(samplerate) > SAMPR_48)
         mix_frame_size = 2;
     else
         mix_frame_size = 1;
@@ -486,5 +515,5 @@ void mixer_set_frequency(unsigned int samplerate)
 /* Get output samplerate */
 unsigned int mixer_get_frequency(void)
 {
-    return mixer_sampr;
+    return pcm_get_frequency();
 }

firmware/usbstack/usb_audio.c

@@ -1337,7 +1337,10 @@ bool usb_audio_fast_transfer_complete(int ep, int dir, int status, int length)
             logf("usbaudio: prebuffering done");
             playback_audio_underflow = false;
             usb_rx_overflow = false;
-            mixer_channel_play_data(PCM_MIXER_CHAN_USBAUDIO, playback_audio_get_more, NULL, 0);
+            static const struct mixer_play_cbs cbs = {
+                .get_more = playback_audio_get_more,
+            };
+            mixer_channel_play_data(PCM_MIXER_CHAN_USBAUDIO, &cbs, NULL, 0);
         }
         restore_irq(oldlevel);
         retval =  true;