lavd/pulse_audio_common: add device detecting code

Signed-off-by: Lukasz Marek <lukasz.m.luki@gmail.com>

libavdevice/pulse_audio_common.c

 /*
- * Pulseaudio input
+ * Pulseaudio common
+ * Copyright (c) 2014 Lukasz Marek
  * Copyright (c) 2011 Luca Barbato <lu_zero@gentoo.org>
  *
  * This file is part of FFmpeg.
@@ -21,6 +22,8 @@
 
 #include "pulse_audio_common.h"
 #include "libavutil/attributes.h"
+#include "libavutil/avstring.h"
+#include "libavutil/mem.h"
 
 pa_sample_format_t av_cold ff_codec_id_to_pulse_format(enum AVCodecID codec_id)
 {
@@ -39,3 +42,175 @@ pa_sample_format_t av_cold ff_codec_id_to_pulse_format(enum AVCodecID codec_id)
     default:                    return PA_SAMPLE_INVALID;
     }
 }
+
+enum PulseAudioLoopState {
+    PA_LOOP_INITIALIZING,
+    PA_LOOP_READY,
+    PA_LOOP_FINISHED
+};
+
+typedef struct PulseAudioDeviceList {
+    AVDeviceInfoList *devices;
+    int error_code;
+    int output;
+    char *default_device;
+} PulseAudioDeviceList;
+
+static void pa_state_cb(pa_context *c, void *userdata)
+{
+    enum PulseAudioLoopState *loop_status = userdata;
+
+    switch  (pa_context_get_state(c)) {
+    case PA_CONTEXT_FAILED:
+    case PA_CONTEXT_TERMINATED:
+        *loop_status = PA_LOOP_FINISHED;
+        break;
+    case PA_CONTEXT_READY:
+        *loop_status = PA_LOOP_READY;
+        break;
+    default:
+        break;
+    }
+}
+
+static void pulse_add_detected_device(PulseAudioDeviceList *info,
+                                      const char *name, const char *description)
+{
+    int ret;
+    AVDeviceInfo *new_device = NULL;
+
+    if (info->error_code)
+        return;
+
+    new_device = av_mallocz(sizeof(AVDeviceInfo));
+    if (!new_device) {
+        info->error_code = AVERROR(ENOMEM);
+        return;
+    }
+
+    new_device->device_description = av_strdup(description);
+    new_device->device_name = av_strdup(name);
+
+    if (!new_device->device_description || !new_device->device_name) {
+        info->error_code = AVERROR(ENOMEM);
+        goto fail;
+    }
+
+    if ((ret = av_dynarray_add_nofree(&info->devices->devices,
+                                      &info->devices->nb_devices, new_device)) < 0) {
+        info->error_code = ret;
+        goto fail;
+    }
+    return;
+
+  fail:
+    av_free(new_device->device_description);
+    av_free(new_device->device_name);
+    av_free(new_device);
+
+}
+
+static void pulse_audio_source_device_cb(pa_context *c, const pa_source_info *dev,
+                                         int eol, void *userdata)
+{
+    if (!eol)
+        pulse_add_detected_device(userdata, dev->name, dev->description);
+}
+
+static void pulse_audio_sink_device_cb(pa_context *c, const pa_sink_info *dev,
+                                       int eol, void *userdata)
+{
+    if (!eol)
+        pulse_add_detected_device(userdata, dev->name, dev->description);
+}
+
+static void pulse_server_info_cb(pa_context *c, const pa_server_info *i, void *userdata)
+{
+    PulseAudioDeviceList *info = userdata;
+    if (info->output)
+        info->default_device = av_strdup(i->default_sink_name);
+    else
+        info->default_device = av_strdup(i->default_source_name);
+    if (!info->default_device)
+        info->error_code = AVERROR(ENOMEM);
+}
+
+int ff_pulse_audio_get_devices(AVDeviceInfoList *devices, const char *server, int output)
+{
+    pa_mainloop *pa_ml = NULL;
+    pa_mainloop_api *pa_mlapi = NULL;
+    pa_operation *pa_op = NULL;
+    pa_context *pa_ctx = NULL;
+    enum pa_operation_state op_state;
+    enum PulseAudioLoopState loop_state = PA_LOOP_INITIALIZING;
+    PulseAudioDeviceList dev_list = { 0 };
+    int i;
+
+    dev_list.output = output;
+    dev_list.devices = devices;
+    devices->nb_devices = 0;
+    devices->devices = NULL;
+    if (!devices)
+        return AVERROR(EINVAL);
+    if (!(pa_ml = pa_mainloop_new()))
+        return AVERROR(ENOMEM);
+    if (!(pa_mlapi = pa_mainloop_get_api(pa_ml))) {
+        dev_list.error_code = AVERROR_EXTERNAL;
+        goto fail;
+    }
+    if (!(pa_ctx = pa_context_new(pa_mlapi, "Query devices"))) {
+        dev_list.error_code = AVERROR(ENOMEM);
+        goto fail;
+    }
+    pa_context_set_state_callback(pa_ctx, pa_state_cb, &loop_state);
+    if (pa_context_connect(pa_ctx, server, 0, NULL) < 0) {
+        dev_list.error_code = AVERROR_EXTERNAL;
+        goto fail;
+    }
+
+    while (loop_state == PA_LOOP_INITIALIZING)
+        pa_mainloop_iterate(pa_ml, 1, NULL);
+    if (loop_state == PA_LOOP_FINISHED) {
+        dev_list.error_code = AVERROR_EXTERNAL;
+        goto fail;
+    }
+
+    if (output)
+        pa_op = pa_context_get_sink_info_list(pa_ctx, pulse_audio_sink_device_cb, &dev_list);
+    else
+        pa_op = pa_context_get_source_info_list(pa_ctx, pulse_audio_source_device_cb, &dev_list);
+    while ((op_state = pa_operation_get_state(pa_op)) == PA_OPERATION_RUNNING)
+        pa_mainloop_iterate(pa_ml, 1, NULL);
+    if (op_state != PA_OPERATION_DONE)
+        dev_list.error_code = AVERROR_EXTERNAL;
+    pa_operation_unref(pa_op);
+    if (dev_list.error_code < 0)
+        goto fail;
+
+    pa_op = pa_context_get_server_info(pa_ctx, pulse_server_info_cb, &dev_list);
+    while ((op_state = pa_operation_get_state(pa_op)) == PA_OPERATION_RUNNING)
+        pa_mainloop_iterate(pa_ml, 1, NULL);
+    if (op_state != PA_OPERATION_DONE)
+        dev_list.error_code = AVERROR_EXTERNAL;
+    pa_operation_unref(pa_op);
+    if (dev_list.error_code < 0)
+        goto fail;
+
+    devices->default_device = -1;
+    for (i = 0; i < devices->nb_devices; i++) {
+        if (!strcmp(devices->devices[i]->device_name, dev_list.default_device)) {
+            devices->default_device = i;
+            break;
+        }
+    }
+
+  fail:
+    av_free(dev_list.default_device);
+    if(pa_ctx)
+        pa_context_disconnect(pa_ctx);
+    if (pa_ctx)
+        pa_context_unref(pa_ctx);
+    if (pa_ml)
+        pa_mainloop_free(pa_ml);
+    return dev_list.error_code;
+}

libavdevice/pulse_audio_common.h

@@ -22,9 +22,12 @@
 #ifndef AVDEVICE_PULSE_AUDIO_COMMON_H
 #define AVDEVICE_PULSE_AUDIO_COMMON_H
 
-#include <pulse/simple.h>
+#include <pulse/pulseaudio.h>
 #include "libavcodec/avcodec.h"
+#include "avdevice.h"
 
 pa_sample_format_t ff_codec_id_to_pulse_format(enum AVCodecID codec_id);
 
+int ff_pulse_audio_get_devices(AVDeviceInfoList *devices, const char *server, int output);
+
 #endif /* AVDEVICE_PULSE_AUDIO_COMMON_H */