Analyzes .wav file structure, reports any inconsistencies.<\/p>\n\n\n\n
<\/code><\/pre>\n\n\n\n# ======================================\n# .WAV file structure integrity test\n# Alex Radzishevsky\n# www.radzishevsky.com\n# February 2026\n# ======================================\n\nimport struct\nimport os\nimport sys\n\ndef get_audio_format(code):\n formats = {\n 0x0001: \"PCM (Integer)\",\n 0x0003: \"IEEE Float\",\n 0x0006: \"ALAW\",\n 0x0007: \"MULAW\",\n 0xFFFE: \"WAVE_FORMAT_EXTENSIBLE\"\n }\n return formats.get(code, f\"Unknown\/Compressed (0x{code:04x})\")\n\ndef hex_dump(data, length=64):\n res = []\n for i in range(0, min(len(data), length), 16):\n chunk = data[i:i+16]\n hex_str = \" \".join(f\"{b:02x}\" for b in chunk)\n ascii_str = \"\".join(chr(b) if 32 <= b <= 126 else \".\" for b in chunk)\n res.append(f\" {i:04x}: {hex_str:<48} |{ascii_str}|\")\n return \"\\n\".join(res)\n\ndef inspect_wav_comprehensive(file_path):\n if not os.path.exists(file_path):\n print(f\"Error: File '{file_path}' not found.\")\n return\n\n file_size = os.path.getsize(file_path)\n print(f\"\\n{'='*85}\")\n print(f\" ANALYSIS REPORT: {os.path.basename(file_path)}\")\n print(f\" SYSTEM FILE SIZE: {file_size} bytes\")\n print(f\"{'='*85}\\n\")\n\n with open(file_path, 'rb') as f:\n # --- 1. INITIAL HEX DUMP ---\n print(\"[01] HEADER HEX PREVIEW (First 64 Bytes)\")\n print(hex_dump(f.read(64)))\n f.seek(0)\n print(\"-\" * 85)\n\n # --- 2. GLOBAL RIFF HEADER ---\n header = f.read(12)\n if len(header) < 12:\n print(\"[CRITICAL ERROR] File is smaller than a 12-byte RIFF header. Investigation aborted.\")\n return\n\n tag, r_size, w_tag = struct.unpack('<4sI4s', header)\n expected_riff_end = 8 + r_size\n \n print(f\"[02] GLOBAL CONTAINER\")\n print(f\" Container ID: {tag.decode(errors='ignore')} (Expected: RIFF)\")\n print(f\" Declared Size: {r_size} bytes\")\n print(f\" Format Type: {w_tag.decode(errors='ignore')} (Expected: WAVE)\")\n \n if r_size != file_size - 8:\n diff = (file_size - 8) - r_size\n status = \"TRAILING DATA\" if diff > 0 else \"TRUNCATED\"\n print(f\" !! INTEGRITY ALERT: Size mismatch. System reports {file_size-8}, Header reports {r_size}.\")\n print(f\" File status appears: {status} by {abs(diff)} bytes.\")\n else:\n print(\" Structure: Global header matches system file size.\")\n print(\"-\" * 85)\n\n # --- 3. CHUNK ITERATOR ---\n print(\"[03] CHUNK EXPLORER\")\n mandatory = {'fmt ': False, 'data': False}\n audio_params = {}\n\n while f.tell() < file_size:\n pos = f.tell()\n \n # Boundary Check\n if file_size - pos < 8:\n print(f\"\\n [!] TRAILING DATA: Found {file_size - pos} unexplained bytes at offset {pos}.\")\n break\n\n c_id_raw, c_size = struct.unpack('<4sI', f.read(8))\n c_id = c_id_raw.decode('ascii', errors='ignore').strip()\n \n print(f\"\\n CHUNK: [{c_id:<4}] | Offset: {pos:<8} | Size: {c_size} bytes\")\n\n # Validate chunk doesn't overrun file\n if f.tell() + c_size > file_size:\n missing = (f.tell() + c_size) - file_size\n print(f\" [CRITICAL] Error: Chunk [{c_id}] is truncated. {missing} bytes are missing from the file.\")\n break\n\n # Process Specific Chunks\n if c_id == 'fmt':\n mandatory['fmt '] = True\n fmt_data = f.read(c_size)\n a_fmt, n_ch, s_rate, b_rate, b_align, bps = struct.unpack('<HHIIHH', fmt_data[:16])\n audio_params = {'s_rate': s_rate, 'n_ch': n_ch, 'bps': bps}\n \n print(f\" > Format Category: {get_audio_format(a_fmt)}\")\n print(f\" > Channels: {n_ch}\")\n print(f\" > Sample Rate: {s_rate} Hz\")\n print(f\" > Bits Per Sample: {bps} bit\")\n print(f\" > Byte Rate: {b_rate} (Calculated: {s_rate * n_ch * (bps \/\/ 8)})\")\n print(f\" > Block Align: {b_align} (Calculated: {n_ch * (bps \/\/ 8)})\")\n \n if b_rate != s_rate * n_ch * (bps \/\/ 8):\n print(\" !! ERROR: Byte Rate calculation is incorrect.\")\n \n if a_fmt == 0xFFFE and len(fmt_data) >= 40:\n v_bps, mask = struct.unpack('<HI', fmt_data[18:24])\n print(f\" > Extensible Info: Valid Bits: {v_bps}, Channel Mask: {hex(mask)}\")\n\n elif c_id == 'data':\n mandatory['data'] = True\n print(f\" > Content: Raw Audio Payload.\")\n if audio_params:\n duration = c_size \/ (audio_params['s_rate'] * audio_params['n_ch'] * (audio_params['bps'] \/ 8))\n print(f\" > Calculated Audio Length: {duration:.3f} seconds\")\n f.seek(c_size, 1)\n\n elif c_id == 'LIST':\n l_type = f.read(4).decode(errors='ignore')\n print(f\" > List Type: {l_type}\")\n if l_type == 'INFO':\n rem = c_size - 4\n while rem > 8:\n m_id, m_sz = struct.unpack('<4sI', f.read(8))\n m_val = f.read(m_sz).decode('ascii', errors='ignore').strip('\\x00')\n print(f\" - {m_id.decode(errors='ignore')}: {m_val}\")\n rem -= (8 + m_sz)\n if m_sz % 2 != 0: \n f.read(1); rem -= 1\n else:\n f.seek(c_size - 4, 1)\n\n else:\n print(f\" > Action: Skipping unhandled chunk.\")\n f.seek(c_size, 1)\n\n # Padding Verification\n if c_size % 2 != 0:\n if f.tell() < file_size:\n pad = f.read(1)\n if pad != b'\\x00':\n print(f\" [!] Warning: Padding byte at {f.tell()-1} is non-zero (0x{pad.hex()}).\")\n else:\n print(f\" [!] Warning: Missing padding byte for odd-sized chunk at end of file.\")\n\n # --- 4. FINAL SUMMARY ---\n print(\"\\n\" + \"-\" * 85)\n print(\"[04] FINAL VERDICT\")\n missing_mandatory = [k for k, v in mandatory.items() if not v]\n if missing_mandatory:\n print(f\" FAILED: Missing mandatory chunks: {missing_mandatory}\")\n elif f.tell() == file_size:\n print(\" SUCCESS: RIFF structure is clean and perfectly aligned.\")\n else:\n print(f\" COMPLETE: Structure parsed, but identified integrity warnings (see above).\")\n print(\"=\" * 85 + \"\\n\")\n\nif __name__ == \"__main__\":\n if len(sys.argv) < 2:\n print(\"Usage: python inspect_wav.py <filename.wav>\")\n else:\n inspect_wav_comprehensive(sys.argv[1])<\/code><\/pre>\n\n\n\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"Analyzes .wav file structure, reports any inconsistencies.<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[143,145,127],"tags":[],"class_list":["post-1616","post","type-post","status-publish","format-standard","hentry","category-programming","category-tech_hacks","category-technology"],"_links":{"self":[{"href":"https:\/\/radzishevsky.com\/blog\/wp-json\/wp\/v2\/posts\/1616","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/radzishevsky.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/radzishevsky.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/radzishevsky.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/radzishevsky.com\/blog\/wp-json\/wp\/v2\/comments?post=1616"}],"version-history":[{"count":1,"href":"https:\/\/radzishevsky.com\/blog\/wp-json\/wp\/v2\/posts\/1616\/revisions"}],"predecessor-version":[{"id":1617,"href":"https:\/\/radzishevsky.com\/blog\/wp-json\/wp\/v2\/posts\/1616\/revisions\/1617"}],"wp:attachment":[{"href":"https:\/\/radzishevsky.com\/blog\/wp-json\/wp\/v2\/media?parent=1616"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/radzishevsky.com\/blog\/wp-json\/wp\/v2\/categories?post=1616"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/radzishevsky.com\/blog\/wp-json\/wp\/v2\/tags?post=1616"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}