--- /dev/null
+/*
+ * Copyright (C) 2016 "IoT.bzh"
+ * Author "Manuel Bachmann"
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#define _GNU_SOURCE
+#include <stdio.h>
+
+#include "audio-api.h"
+#include "audio-pulse.h"
+
+static struct alsa_info **alsa_info = NULL;
+static struct dev_ctx_pulse **dev_ctx_p = NULL;
+static unsigned int client_count = 0;
+
+
+unsigned char _pulse_init (const char *name, audioCtxHandleT *ctx) {
+
+ pa_mainloop *pa_loop;
+ pa_mainloop_api *pa_api;
+ pa_context *pa_context;
+ pa_simple *pa;
+ pa_sample_spec *pa_spec;
+ struct timeval tv_start, tv_now;
+ int ret, error, i;
+
+ pa_loop = pa_mainloop_new ();
+ pa_api = pa_mainloop_get_api (pa_loop);
+ pa_context = pa_context_new (pa_api, "afb-audio-plugin");
+
+ /* allocate the global array if it hasn't been done */
+ if (!dev_ctx_p)
+ dev_ctx_p = (dev_ctx_pulse_T**) malloc (sizeof(dev_ctx_pulse_T*));
+
+ /* create a temporary device, to be held until sink gets discovered */
+ dev_ctx_pulse_T *dev_ctx_p_t = (dev_ctx_pulse_T*) malloc (sizeof(dev_ctx_pulse_T));
+ dev_ctx_p_t->sink_name = NULL;
+ dev_ctx_p_t->card_name = (char**) malloc (sizeof(char*));
+ dev_ctx_p_t->card_name[0] = strdup (name);
+ dev_ctx_p_t->pa_loop = pa_loop;
+ dev_ctx_p_t->pa_context = pa_context;
+
+ pa_context_set_state_callback (pa_context, _pulse_context_cb, (void*)dev_ctx_p_t);
+ pa_context_connect (pa_context, NULL, 0, NULL);
+
+ /* 1 second should be sufficient to retrieve sink info */
+ gettimeofday (&tv_start, NULL);
+ gettimeofday (&tv_now, NULL);
+ while (tv_now.tv_sec - tv_start.tv_sec <= 2) {
+ pa_mainloop_iterate (pa_loop, 0, &ret);
+
+ if (ret == -1) { /* generic error */
+ fprintf (stderr, "Stopping PulseAudio backend...\n");
+ return 0;
+ }
+
+ if ((ret > 0)&&(ret < 100)) { /* 0 and >100 are PulseAudio codes */
+ /* found a matching sink from callback */
+ fprintf (stderr, "Success : using sink n.%d\n", ret-1);
+ ctx->audio_dev = (void*)dev_ctx_p[ret-1];
+ break;
+ }
+ gettimeofday (&tv_now, NULL);
+ }
+ /* fail if we found no matching sink */
+ if (!ctx->audio_dev)
+ return 0;
+
+ /* make the client context aware of current card state */
+ ctx->mute = (unsigned char)dev_ctx_p[ret-1]->mute;
+ ctx->channels = (unsigned int)dev_ctx_p[ret-1]->volume.channels;
+ for (i = 0; i < ctx->channels; i++)
+ ctx->volume[i] = dev_ctx_p[ret-1]->volume.values[i];
+ ctx->idx = ret-1;
+
+ /* open matching sink for playback */
+ pa_spec = (pa_sample_spec*) malloc (sizeof(pa_sample_spec));
+ pa_spec->format = PA_SAMPLE_S16LE;
+ pa_spec->rate = 22050;
+ pa_spec->channels = (uint8_t)ctx->channels;
+
+ if (!(pa = pa_simple_new (NULL, "afb-audio-plugin", PA_STREAM_PLAYBACK, dev_ctx_p[ret-1]->sink_name,
+ "afb-audio-output", pa_spec, NULL, NULL, &error))) {
+ fprintf (stderr, "Error opening PulseAudio sink %s : %s\n",
+ dev_ctx_p[ret-1]->sink_name, pa_strerror(error));
+ return 0;
+ }
+ dev_ctx_p[ret-1]->pa = pa;
+ free (pa_spec);
+
+ client_count++;
+
+ fprintf (stderr, "Successfully initialized PulseAudio backend.\n");
+
+ return 1;
+}
+
+void _pulse_free (audioCtxHandleT *ctx) {
+
+ int num, i;
+
+ client_count--;
+ if (client_count > 0) return;
+
+ for (num = 0; num < (sizeof(dev_ctx_p)/sizeof(dev_ctx_pulse_T*)); num++) {
+
+ for (i = 0; num < (sizeof(dev_ctx_p[num]->card_name)/sizeof(char*)); i++) {
+ free (dev_ctx_p[num]->card_name[i]);
+ dev_ctx_p[num]->card_name[i] = NULL;
+ }
+ pa_context_disconnect (dev_ctx_p[num]->pa_context);
+ pa_context_unref (dev_ctx_p[num]->pa_context);
+ pa_mainloop_free (dev_ctx_p[num]->pa_loop);
+ pa_simple_free (dev_ctx_p[num]->pa);
+ free (dev_ctx_p[num]->sink_name);
+ dev_ctx_p[num]->pa_context = NULL;
+ dev_ctx_p[num]->pa_loop = NULL;
+ dev_ctx_p[num]->pa = NULL;
+ dev_ctx_p[num]->sink_name = NULL;
+ free (dev_ctx_p[num]);
+ }
+}
+
+void _pulse_play (audioCtxHandleT *ctx) {
+
+ dev_ctx_pulse_T* dev_ctx_p_c = (dev_ctx_pulse_T*)ctx->audio_dev;
+
+ if (!dev_ctx_p_c || dev_ctx_p_c->thr_should_run || access (AUDIO_BUFFER, F_OK) == -1)
+ return;
+
+ dev_ctx_p_c->thr_should_run = 1;
+ dev_ctx_p_c->thr_finished = 0;
+ pthread_create (&dev_ctx_p_c->thr, NULL, _pulse_play_thread_fn, (void*)dev_ctx_p_c);
+}
+
+void _pulse_stop (audioCtxHandleT *ctx) {
+
+ dev_ctx_pulse_T* dev_ctx_p_c = (dev_ctx_pulse_T*)ctx->audio_dev;
+
+ if (!dev_ctx_p_c || !dev_ctx_p_c->thr_should_run)
+ return;
+
+ dev_ctx_p_c->thr_should_run = 0;
+ while (!dev_ctx_p_c->thr_finished)
+ usleep(100000);
+ pthread_join (dev_ctx_p_c->thr, NULL);
+}
+
+unsigned int _pulse_get_volume (audioCtxHandleT *ctx, unsigned int channel) {
+
+ dev_ctx_pulse_T* dev_ctx_p_c = (dev_ctx_pulse_T*)ctx->audio_dev;
+
+ if (!dev_ctx_p_c)
+ return 0;
+
+ _pulse_refresh_sink (dev_ctx_p_c);
+
+ return (dev_ctx_p_c->volume.values[channel]*100)/PA_VOLUME_NORM;
+}
+
+void _pulse_set_volume (audioCtxHandleT *ctx, unsigned int channel, unsigned int vol) {
+
+ dev_ctx_pulse_T* dev_ctx_p_c = (dev_ctx_pulse_T*)ctx->audio_dev;
+ struct pa_cvolume volume;
+
+ if (!dev_ctx_p_c)
+ return;
+
+ volume = dev_ctx_p_c->volume;
+ volume.values[channel] = (vol*PA_VOLUME_NORM)/100;
+
+ pa_context_set_sink_volume_by_name (dev_ctx_p_c->pa_context, dev_ctx_p_c->sink_name,
+ &volume, NULL, NULL);
+ _pulse_refresh_sink (dev_ctx_p_c);
+}
+
+void _pulse_set_volume_all (audioCtxHandleT *ctx, unsigned int vol) {
+
+ dev_ctx_pulse_T* dev_ctx_p_c = (dev_ctx_pulse_T*)ctx->audio_dev;
+ struct pa_cvolume volume;
+
+ if (!dev_ctx_p_c)
+ return;
+
+ pa_cvolume_init (&volume);
+ pa_cvolume_set (&volume, dev_ctx_p_c->volume.channels, vol);
+
+ pa_context_set_sink_volume_by_name (dev_ctx_p_c->pa_context, dev_ctx_p_c->sink_name,
+ &volume, NULL, NULL);
+ _pulse_refresh_sink (dev_ctx_p_c);
+}
+
+unsigned char _pulse_get_mute (audioCtxHandleT *ctx) {
+
+ dev_ctx_pulse_T* dev_ctx_p_c = (dev_ctx_pulse_T*)ctx->audio_dev;
+
+ if (!dev_ctx_p_c)
+ return 0;
+
+ _pulse_refresh_sink (dev_ctx_p_c);
+
+ return (unsigned char)dev_ctx_p_c->mute;
+}
+
+void _pulse_set_mute (audioCtxHandleT *ctx, unsigned char mute) {
+
+ dev_ctx_pulse_T* dev_ctx_p_c = (dev_ctx_pulse_T*)ctx->audio_dev;
+
+ if (!dev_ctx_p_c)
+ return;
+
+ pa_context_set_sink_mute_by_name (dev_ctx_p_c->pa_context, dev_ctx_p_c->sink_name,
+ (int)mute, NULL, NULL);
+ _pulse_refresh_sink (dev_ctx_p_c);
+}
+
+ /* ---- LOCAL HELPER FUNCTIONS ---- */
+
+void _pulse_refresh_sink (dev_ctx_pulse_T* dev_ctx_p_c) {
+
+ pa_mainloop_api *pa_api;
+
+ dev_ctx_p_c->pa_loop = pa_mainloop_new ();
+ pa_api = pa_mainloop_get_api (dev_ctx_p_c->pa_loop);
+ dev_ctx_p_c->pa_context = pa_context_new (pa_api, "afb-audio-plugin");
+
+ dev_ctx_p_c->refresh = 1;
+
+ switch (pa_context_get_state (dev_ctx_p_c->pa_context)) {
+ case PA_CONTEXT_READY:
+ pa_context_get_sink_info_by_name (dev_ctx_p_c->pa_context,
+ dev_ctx_p_c->sink_name,
+ _pulse_sink_info_cb, (void*)dev_ctx_p_c);
+ break;
+ default:
+ return;
+ }
+
+ while (dev_ctx_p_c->refresh)
+ pa_mainloop_iterate (dev_ctx_p_c->pa_loop, 0, NULL);
+}
+
+void _pulse_enumerate_cards () {
+
+ void **cards, **card;
+ char *name, *found, *alsa_name, *card_name;
+ int new_info, i, num = 0;
+
+ /* allocate the global alsa array */
+ alsa_info = (alsa_info_T**) malloc (sizeof(alsa_info_T*));
+ alsa_info[0] = (alsa_info_T*) malloc (sizeof(alsa_info_T));
+ alsa_info[0]->device = NULL;
+ alsa_info[0]->synonyms = NULL;
+
+ /* we use ALSA to enumerate cards */
+ snd_device_name_hint (-1, "pcm", &cards);
+ card = cards;
+
+ for (; *card != NULL; card++) {
+ name = snd_device_name_get_hint (*card, "NAME");
+ new_info = 1;
+
+ /* alsa name is before ':' (if ':' misses, then it has no card) */
+ found = strstr (name, ":");
+ if (!found) continue;
+ /* */
+ alsa_name = (char*) malloc (found-name+1);
+ strncpy (alsa_name, name, found-name);
+ alsa_name[found-name] = '\0';
+
+ /* card name is the invariant between "CARD=" and ',' */
+ found = strstr (name, "CARD=");
+ if (!found) continue;
+ /* */
+ found += 5;
+ card_name = strdup (found);
+ found = strstr (card_name, ",");
+ if (found) card_name[found-card_name] = '\0';
+
+ /* was the card name already listed in the global alsa array ? */
+ for (i = 0; i < (sizeof(alsa_info)/sizeof(alsa_info_T*)); i++) {
+
+ if (alsa_info[i]->device &&
+ !strcmp (alsa_info[i]->device, card_name)) {
+ /* it was ; add the alsa name as a new synonym */
+ asprintf (&alsa_info[i]->synonyms, "%s:%s", alsa_info[i]->synonyms, alsa_name);
+ new_info = 0;
+ break;
+ }
+ }
+ /* it was not ; create it */
+ if (new_info) {
+ alsa_info = (alsa_info_T**) realloc (alsa_info, (num+1)*sizeof(alsa_info_T*));
+ alsa_info[num] = (alsa_info_T*) malloc (sizeof(alsa_info_T));
+ alsa_info[num]->device = strdup (card_name);
+ asprintf (&alsa_info[num]->synonyms, ":%s", alsa_name);
+ num++;
+ }
+ free (alsa_name);
+ free (card_name);
+ }
+}
+
+char** _pulse_find_cards (const char *name) {
+
+ char **cards = NULL;
+ char *needle, *found, *next;
+ int num, i = 0;
+
+ if (!alsa_info)
+ _pulse_enumerate_cards ();
+
+ asprintf (&needle, ":%s", name);
+
+ for (num = 0; num < (sizeof(alsa_info)/sizeof(alsa_info_T*)); num++) {
+
+ found = strstr (alsa_info[num]->synonyms, needle);
+ while (found) {
+ /* if next character is not ':' or '\0', we are wrong */
+ if ((found[strlen(name)+1] != ':') && (found[strlen(name)+1] != '\0')) {
+ found = strstr (found+1, needle);
+ continue;
+ }
+ /* found it ; now return all the "synonym" cards */
+ found = strstr (alsa_info[num]->synonyms, ":");
+ while (found) {
+ next = strstr (found+1, ":");
+ if (!next) break;
+ cards = (char**) realloc (cards, (i+1)*sizeof(char*));
+ cards[i] = (char*) malloc (next-found+1);
+ strncpy (cards[i], found+1, next-found);
+ cards[i][next-found-1] = '\0';
+ found = next; i++;
+ }
+ }
+ }
+ free (needle);
+
+ return cards;
+}
+
+ /* ---- LOCAL CALLBACK FUNCTIONS ---- */
+
+void _pulse_context_cb (pa_context *context, void *data) {
+
+ pa_context_state_t state = pa_context_get_state (context);
+ dev_ctx_pulse_T *dev_ctx_p_t = (dev_ctx_pulse_T *)data;
+
+ if (state == PA_CONTEXT_FAILED) {
+ fprintf (stderr, "Could not connect to PulseAudio !\n");
+ pa_mainloop_quit (dev_ctx_p_t->pa_loop, -1);
+ pa_context_disconnect (dev_ctx_p_t->pa_context);
+ pa_context_unref (dev_ctx_p_t->pa_context);
+ pa_mainloop_free (dev_ctx_p_t->pa_loop);
+ }
+
+ if (state == PA_CONTEXT_READY)
+ pa_context_get_sink_info_list (context, _pulse_sink_list_cb, (void*)dev_ctx_p_t);
+}
+
+void _pulse_sink_list_cb (pa_context *context, const pa_sink_info *info,
+ int eol, void *data) {
+
+ dev_ctx_pulse_T *dev_ctx_p_t = (dev_ctx_pulse_T *)data;
+ const char *device_string;
+ char *device, *found;
+ char **cards;
+ int num, i;
+
+ if (eol != 0)
+ return;
+
+ device_string = pa_proplist_gets (info->proplist, "device.string");
+ /* ignore sinks with no cards */
+ if (!device_string)
+ return;
+
+ /* was a sink with similar name already found ? */
+ for (num = 0; num < (sizeof(dev_ctx_p)/sizeof(dev_ctx_pulse_T*)); num++) {
+ if (dev_ctx_p[num]->sink_name &&
+ !strcmp (dev_ctx_p[num]->sink_name, info->name)) {
+
+ /* yet it was, did it have the required card ? */
+ cards = dev_ctx_p[num]->card_name;
+ for (i = 0; i < (sizeof(cards)/sizeof(char*)); i++) {
+ if (!strcmp (cards[i], dev_ctx_p_t->card_name[0])) {
+ /* it did : stop there and succeed */
+ fprintf (stderr, "Found matching sink : %s\n", info->name);
+ /* we return num+1 because '0' is already used */
+ pa_mainloop_quit (dev_ctx_p_t->pa_loop, num+1);
+ pa_context_disconnect (dev_ctx_p_t->pa_context);
+ pa_context_unref (dev_ctx_p_t->pa_context);
+ pa_mainloop_free (dev_ctx_p_t->pa_loop);
+ }
+ }
+ /* it did not, ignore and return */
+ return;
+ }
+ }
+ num++;
+
+ /* remove ending ":0",":1"... in device name */
+ device = strdup (device_string);
+ found = strstr (device, ":");
+ if (found) device[found-device] = '\0';
+
+ /* new sink, find all the cards it manages, fail if none */
+ cards = _pulse_find_cards (device);
+ free (device);
+ if (!cards)
+ return;
+
+ /* everything is well, register it in global array */
+ dev_ctx_p_t->sink_name = strdup (info->name);
+ dev_ctx_p_t->card_name = cards;
+ dev_ctx_p_t->mute = info->mute;
+ dev_ctx_p_t->volume = info->volume;
+ dev_ctx_p_t->thr_should_run = 0;
+ dev_ctx_p_t->thr_finished = 0;
+ dev_ctx_p[num] = dev_ctx_p_t;
+
+ /* does this new sink have the card we are looking for ? */ /* TODO : factorize this */
+ for (i = 0; i < (sizeof(cards)/sizeof(char*)); i++) {
+ if (!strcmp (cards[i], dev_ctx_p_t->card_name[0])) {
+ /* it did : stop there and succeed */
+ fprintf (stderr, "Found matching sink : %s\n", info->name);
+ /* we return num+1 because '0' is already used */
+ pa_mainloop_quit (dev_ctx_p_t->pa_loop, num+1);
+ pa_context_disconnect (dev_ctx_p_t->pa_context);
+ pa_context_unref (dev_ctx_p_t->pa_context);
+ pa_mainloop_free (dev_ctx_p_t->pa_loop);
+ }
+ }
+}
+
+void _pulse_sink_info_cb (pa_context *context, const pa_sink_info *info,
+ int eol, void *data) {
+
+ dev_ctx_pulse_T *dev_ctx_p_c = (dev_ctx_pulse_T *)data;
+
+ if (eol != 0)
+ return;
+
+ dev_ctx_p_c->refresh = 0;
+ dev_ctx_p_c->mute = info->mute;
+ dev_ctx_p_c->volume = info->volume;
+}
+
+ /* ---- LOCAL THREADED FUNCTIONS ---- */
+
+void* _pulse_play_thread_fn (void *ctx) {
+
+ dev_ctx_pulse_T *dev_ctx_p_c = (dev_ctx_pulse_T *)ctx;
+ FILE *file = NULL;
+ char *buf = NULL;
+ long size;
+ int error;
+
+ file = fopen (AUDIO_BUFFER, "rb");
+
+ while (dev_ctx_p_c->thr_should_run && file && (access (AUDIO_BUFFER, F_OK) != -1) ) {
+ fseek (file, 0, SEEK_END);
+ size = ftell (file);
+ buf = (char*) realloc (buf, size * sizeof(char));
+
+ fseek (file, 0, SEEK_SET);
+ fread (buf, 1, size, file);
+ fflush (file);
+
+ if (pa_simple_write (dev_ctx_p_c->pa, buf, size*2, &error) < 0)
+ fprintf (stderr, "Error writing to PulseAudio : %s\n", pa_strerror (error));
+ /* pa_simple_drain (dev_ctx_p_c->pa); */
+ }
+ if (buf) free(buf);
+ if (file) fclose(file);
+
+ dev_ctx_p_c->thr_finished = 1;
+ return 0;
+}
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