tts cpp cli builds and runs fine.

otherarch/ttscpp/cli/playback.cpp

@@ -0,0 +1,62 @@
+#include <cstdint>
+#include "playback.h"
+
+#ifndef SDL2_INSTALL
+void register_play_tts_response_args(arg_list & args) {
+    // Hide --play
+}
+
+bool play_tts_response(arg_list & args, const tts_response & data, float sample_rate) {
+    return false;
+}
+#else
+#include "SDL.h"
+void register_play_tts_response_args(arg_list & args) {
+    args.add_argument(bool_arg("--play", "(OPTIONAL) Whether to play back the audio immediately instead of saving it to file."));
+}
+
+bool play_tts_response(arg_list & args, const tts_response & data, float sample_rate) {
+    if (!args.get_bool_param("--play")) {
+        return false;
+    }
+
+    if (SDL_Init(SDL_INIT_AUDIO)) {
+        fprintf(stderr, "SDL_INIT failed\n");
+        exit(1);
+    }
+
+    const SDL_AudioSpec desired{
+        .freq = static_cast<int>(sample_rate),
+        .format = AUDIO_F32,
+        .channels = 1,
+        .silence = 0,
+        .padding = 0,
+        .size = static_cast<unsigned>(data.n_outputs),
+        .callback = nullptr,
+        .userdata = nullptr,
+    };
+    const SDL_AudioDeviceID dev = SDL_OpenAudioDevice(nullptr, false, &desired, nullptr, 0);
+    if (!dev) {
+        fprintf(stderr, "SDL_OpenAudioDevice failed\n");
+        exit(1);
+    }
+
+    SDL_PauseAudioDevice(dev, false);
+    fprintf(stdout, "Playing %ld samples of audio\n", data.n_outputs);
+    if (SDL_QueueAudio(dev, data.data, data.n_outputs * sizeof(data.data[0]))) {
+        fprintf(stderr, "SDL_QueueAudio failed\n");
+        exit(1);
+    }
+
+    SDL_Event event;
+    while (SDL_GetQueuedAudioSize(dev)) {
+        if (SDL_PollEvent(&event) && event.type == SDL_QUIT) break;
+        SDL_Delay(100);
+    }
+
+    SDL_CloseAudioDevice(dev);
+    SDL_Quit();
+
+    return true;
+}
+#endif