New upstream version 19.0.3+dfsg1

UI/frontend-plugins/frontend-tools/captions-handler.hpp

@@ -0,0 +1,67 @@
+#pragma once
+
+#include <media-io/audio-resampler.h>
+#include <obs-module.h>
+#include <functional>
+#include <string>
+
+class resampler_obj {
+	audio_resampler_t *resampler = nullptr;
+
+public:
+	inline ~resampler_obj()
+	{
+		audio_resampler_destroy(resampler);
+	}
+
+	inline bool reset(const resample_info &dst, const resample_info &src)
+	{
+		audio_resampler_destroy(resampler);
+		resampler = audio_resampler_create(&dst, &src);
+		return !!resampler;
+	}
+
+	inline operator audio_resampler_t*() {return resampler;}
+};
+
+/* ------------------------------------------------------------------------- */
+
+typedef std::function<void (const std::string &)> captions_cb;
+
+#define captions_error(s) std::string(obs_module_text("Captions.Error." ## s))
+#define CAPTIONS_ERROR_GENERIC_FAIL     captions_error("GenericFail")
+
+/* ------------------------------------------------------------------------- */
+
+class captions_handler {
+	captions_cb cb;
+	resampler_obj resampler;
+
+protected:
+	inline void callback(const std::string &text)
+	{
+		cb(text);
+	}
+
+	virtual void pcm_data(const void *data, size_t frames)=0;
+
+	/* always resamples to 1 channel */
+	bool reset_resampler(enum audio_format format, uint32_t sample_rate);
+
+public:
+	/* throw std::string for errors shown to users */
+	captions_handler(
+			captions_cb       callback,
+			enum audio_format format,
+			uint32_t          sample_rate);
+	virtual ~captions_handler() {}
+
+	void push_audio(const audio_data *audio);
+};
+
+/* ------------------------------------------------------------------------- */
+
+struct captions_handler_info {
+	std::string       (*name)(void);
+	captions_handler *(*create)(captions_cb cb, const std::string &lang);
+};