godot/servers/movie_writer/movie_writer_pngwav.cpp

/**************************************************************************/
/*  movie_writer_pngwav.cpp                                               */
/**************************************************************************/
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/* Copyright (c) 2014-present Godot Engine contributors (see AUTHORS.md). */
/* Copyright (c) 2007-2014 Juan Linietsky, Ariel Manzur.                  */
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#include "movie_writer_pngwav.h"
#include "core/config/project_settings.h"
#include "core/io/dir_access.h"

uint32_t MovieWriterPNGWAV::get_audio_mix_rate() const {
	return mix_rate;
}
AudioServer::SpeakerMode MovieWriterPNGWAV::get_audio_speaker_mode() const {
	return speaker_mode;
}

void MovieWriterPNGWAV::get_supported_extensions(List<String> *r_extensions) const {
	r_extensions->push_back("png");
}

bool MovieWriterPNGWAV::handles_file(const String &p_path) const {
	return p_path.get_extension().to_lower() == "png";
}

String MovieWriterPNGWAV::zeros_str(uint32_t p_index) {
	char zeros[MAX_TRAILING_ZEROS + 1];
	for (uint32_t i = 0; i < MAX_TRAILING_ZEROS; i++) {
		uint32_t idx = MAX_TRAILING_ZEROS - i - 1;
		uint32_t digit = (p_index / uint32_t(Math::pow(double(10), double(idx)))) % 10;
		zeros[i] = '0' + digit;
	}
	zeros[MAX_TRAILING_ZEROS] = 0;
	return zeros;
}

Error MovieWriterPNGWAV::write_begin(const Size2i &p_movie_size, uint32_t p_fps, const String &p_base_path) {
	// Quick & Dirty PNGWAV Code based on - https://docs.microsoft.com/en-us/windows/win32/directshow/avi-riff-file-reference

	base_path = p_base_path.get_basename();
	if (base_path.is_relative_path()) {
		base_path = "res://" + base_path;
	}

	{
		//Remove existing files before writing anew
		uint32_t idx = 0;
		Ref<DirAccess> d = DirAccess::open(base_path.get_base_dir());
		String file = base_path.get_file();
		while (true) {
			String path = file + zeros_str(idx) + ".png";
			if (d->remove(path) != OK) {
				break;
			}
		}
	}

	f_wav = FileAccess::open(base_path + ".wav", FileAccess::WRITE_READ);
	ERR_FAIL_COND_V(f_wav.is_null(), ERR_CANT_OPEN);

	fps = p_fps;

	f_wav->store_buffer((const uint8_t *)"RIFF", 4);
	int total_size = 4 /* WAVE */ + 8 /* fmt+size */ + 16 /* format */ + 8 /* data+size */;
	f_wav->store_32(total_size); //will store final later
	f_wav->store_buffer((const uint8_t *)"WAVE", 4);

	/* FORMAT CHUNK */

	f_wav->store_buffer((const uint8_t *)"fmt ", 4);

	uint32_t channels = 2;
	switch (speaker_mode) {
		case AudioServer::SPEAKER_MODE_STEREO:
			channels = 2;
			break;
		case AudioServer::SPEAKER_SURROUND_31:
			channels = 4;
			break;
		case AudioServer::SPEAKER_SURROUND_51:
			channels = 6;
			break;
		case AudioServer::SPEAKER_SURROUND_71:
			channels = 8;
			break;
	}

	f_wav->store_32(16); //standard format, no extra fields
	f_wav->store_16(1); // compression code, standard PCM
	f_wav->store_16(channels); //CHANNELS: 2

	f_wav->store_32(mix_rate);

	/* useless stuff the format asks for */

	int bits_per_sample = 32;
	int blockalign = bits_per_sample / 8 * channels;
	int bytes_per_sec = mix_rate * blockalign;

	audio_block_size = (mix_rate / fps) * blockalign;

	f_wav->store_32(bytes_per_sec);
	f_wav->store_16(blockalign); // block align (unused)
	f_wav->store_16(bits_per_sample);

	/* DATA CHUNK */

	f_wav->store_buffer((const uint8_t *)"data", 4);

	f_wav->store_32(0); //data size... wooh
	wav_data_size_pos = f_wav->get_position();

	return OK;
}

Error MovieWriterPNGWAV::write_frame(const Ref<Image> &p_image, const int32_t *p_audio_data) {
	ERR_FAIL_COND_V(!f_wav.is_valid(), ERR_UNCONFIGURED);

	Vector<uint8_t> png_buffer = p_image->save_png_to_buffer();

	Ref<FileAccess> fi = FileAccess::open(base_path + zeros_str(frame_count) + ".png", FileAccess::WRITE);
	fi->store_buffer(png_buffer.ptr(), png_buffer.size());
	f_wav->store_buffer((const uint8_t *)p_audio_data, audio_block_size);

	frame_count++;

	return OK;
}

void MovieWriterPNGWAV::write_end() {
	if (f_wav.is_valid()) {
		uint32_t total_size = 4 /* WAVE */ + 8 /* fmt+size */ + 16 /* format */ + 8 /* data+size */;
		uint32_t datasize = f_wav->get_position() - wav_data_size_pos;
		f_wav->seek(4);
		f_wav->store_32(total_size + datasize);
		f_wav->seek(0x28);
		f_wav->store_32(datasize);
	}
}

MovieWriterPNGWAV::MovieWriterPNGWAV() {
	mix_rate = GLOBAL_GET("editor/movie_writer/mix_rate");
	speaker_mode = AudioServer::SpeakerMode(int(GLOBAL_GET("editor/movie_writer/speaker_mode")));
}