初版

[SPRESENSE 2026]AudioHack漢字に対応したにょ[CVBS]

製作品

(MIT) The MIT License

@[x](https://x.com/chrmlinux03/status/2066786621954101501) ``` import struct import sys import os from misaki_font8x12L import get_glyph as _get_glyph # horizontal punctuation correction (move to bottom of glyph) HORI_PUNCT = { '。': [0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x60, 0xA0, 0xA0, 0x60], '、': [0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x80, 0x40, 0x40, 0x00], '・': [0x00, 0x00, 0x00, 0x00, 0x00, 0x60, 0x60, 0x00, 0x00, 0x00, 0x00, 0x00], } def get_glyph(char): if char in HORI_PUNCT: return HORI_PUNCT[char] return _get_glyph(char) # constants SAMPLE_RATE = 188811 NTSC_H_FREQ = 15734.26 NTSC_H = 262 NTSC_W = round(SAMPLE_RATE / NTSC_H_FREQ) # 12 SYNC_W = 2 BLANK_W = 3 VIDEO_W = NTSC_W - SYNC_W - BLANK_W # 9 dots (1 sample = 1 dot) FONT_W = 8 # font width FONT_H = 12 # font height (8x12L) CHAR_SPACE = 1 # space between characters LINE_REPEAT = 16 # scanlines per font row PCM_SYNC = 0x000000 # sync level PCM_BLACK = 0x100000 # black level PCM_WHITE = 0x7FFFFF # white level SCROLL_SPEED = 6 # frames per 1 dot scroll (lower = faster) def build_scroll_buffer(string): """Render full string into a wide scroll buffer""" padding = VIDEO_W # leading/trailing blank total_w = padding + len(string) * (FONT_W + CHAR_SPACE) + padding buf = [[0] * total_w for _ in range(FONT_H)] x = padding for char in string: glyph = get_glyph(char) for row in range(FONT_H): for col in range(FONT_W): bit = (glyph[row] >> (7 - col)) & 1 if bit and (x + col) < total_w: buf[row][x + col] = 1 x += FONT_W + CHAR_SPACE return buf, total_w def generate_ntsc_scroll(string, scroll_speed=SCROLL_SPEED): fname = "kanji.raw" fps = SAMPLE_RATE / (NTSC_W * NTSC_H) buf, total_w = build_scroll_buffer(string) scroll_steps = total_w - VIDEO_W total_frames = scroll_steps * scroll_speed print(f"String : {string}") print(f"VIDEO_W : {VIDEO_W} dots") print(f"FONT : {FONT_W}x{FONT_H}L") print(f"FPS : {fps:.3f}") print(f"Frames : {total_frames}") print(f"Duration : {total_frames / fps:.1f} sec") print(f"Generating {fname}...") with open(fname, "wb") as f: for frame in range(total_frames): if frame % 100 == 0: pct = frame / total_frames * 100 sys.stdout.write(f"\r{pct:.1f}% ({frame}/{total_frames})") sys.stdout.flush() offset = frame // scroll_speed # current scroll position (dots) for y in range(NTSC_H): if y < 9: # vertical sync period for s in range(NTSC_W): f.write(struct.pack("<i", PCM_SYNC)[:3]) # L: sync f.write(struct.pack("<i", PCM_SYNC)[:3]) # R: sync continue elif y >= 240: # blanking area for s in range(NTSC_W): f.write(struct.pack("<i", PCM_BLACK)[:3]) # L: black f.write(struct.pack("<i", PCM_BLACK)[:3]) # R: black continue start_y = (240 - LINE_REPEAT * FONT_H) // 2 + 9 # vertical centering v_row = (y - start_y) // LINE_REPEAT # font row index (0~11) for s in range(NTSC_W): if s < SYNC_W: l = PCM_SYNC # L: horizontal sync r = PCM_BLACK # R: black elif s < SYNC_W + BLANK_W: l = PCM_BLACK # L: blanking r = PCM_BLACK # R: black else: v_col = s - (SYNC_W + BLANK_W) # 0~8 dot_x = offset + v_col # position in scroll buffer if 0 <= v_row < FONT_H and 0 <= dot_x < total_w: pixel = buf[v_row][dot_x] else: pixel = 0 l = PCM_WHITE if pixel else PCM_BLACK # L: video r = PCM_BLACK # R: black f.write(struct.pack("<i", l)[:3]) f.write(struct.pack("<i", r)[:3]) size = os.path.getsize(fname) sys.stdout.write(f"\r100.0% ({total_frames}/{total_frames})\n") print(f"Done: {fname} ({size:,} bytes)") if __name__ == "__main__": user_input = input("Enter string (hiragana/katakana/kanji OK): ") if user_input: generate_ntsc_scroll(user_input) else: print("No input provided.") ```