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Use ?url= for GET or {\\\"url\\\": \\\"...\\\"} for POST\" }),\n {\n status: 400,\n headers: { \"Content-Type\": \"application/json\" },\n },\n );\n }\n\n try {\n // Download the MP3 file\n const response = await fetch(mp3Url);\n if (!response.ok) {\n return new Response(JSON.stringify({ error: \"Failed to download MP3 file\" }), {\n status: 400,\n headers: { \"Content-Type\": \"application/json\" },\n });\n }\n\n // Check content type\n const contentType = response.headers.get(\"content-type\");\n if (contentType && !contentType.startsWith(\"audio/\")) {\n return new Response(JSON.stringify({ error: \"URL does not point to an audio file\" }), {\n status: 400,\n headers: { \"Content-Type\": \"application/json\" },\n });\n }\n\n // Convert to ArrayBuffer\n const arrayBuffer = await response.arrayBuffer();\n const buffer = new Uint8Array(arrayBuffer);\n\n // Parse MP3 duration\n const duration = await getMp3Duration(buffer);\n\n if (duration === null) {\n return new Response(JSON.stringify({ error: \"Could not determine audio duration\" }), {\n status: 400,\n headers: { \"Content-Type\": \"application/json\" },\n });\n }\n\n // Round up to nearest integer\n const roundedDuration = Math.ceil(duration);\n\n return new Response(JSON.stringify({ duration: roundedDuration }), {\n headers: {\n \"Content-Type\": \"application/json\",\n \"Access-Control-Allow-Origin\": \"*\",\n \"Access-Control-Allow-Methods\": \"GET, POST\",\n \"Access-Control-Allow-Headers\": \"Content-Type\",\n },\n });\n } catch (error) {\n return new Response(JSON.stringify({ error: \"Failed to process MP3 file\" }), {\n status: 500,\n headers: { \"Content-Type\": \"application/json\" },\n });\n }\n}\n\n// More robust MP3 duration parser\nasync function getMp3Duration(buffer: Uint8Array): Promise {\n try {\n let offset = 0;\n\n // Skip ID3v2 tag if present\n if (\n buffer.length >= 10\n && buffer[0] === 0x49 && buffer[1] === 0x44 && buffer[2] === 0x33\n ) {\n const tagSize = ((buffer[6] & 0x7f) << 21)\n | ((buffer[7] & 0x7f) << 14)\n | ((buffer[8] & 0x7f) << 7)\n | (buffer[9] & 0x7f);\n offset = tagSize + 10;\n }\n\n // Look for Xing/Info header for VBR files\n const xingOffset = findXingHeader(buffer, offset);\n if (xingOffset !== -1) {\n const duration = parseXingHeader(buffer, xingOffset);\n if (duration > 0) return duration;\n }\n\n // Fallback: Find first valid MP3 frame and estimate\n let frameInfo = null;\n for (let i = offset; i < Math.min(buffer.length - 4, offset + 8192); i++) {\n if (buffer[i] === 0xFF && (buffer[i + 1] & 0xE0) === 0xE0) {\n frameInfo = parseFrameHeader(buffer, i);\n if (frameInfo) {\n offset = i;\n break;\n }\n }\n }\n\n if (!frameInfo) {\n // Ultimate fallback: estimate based on file size\n const fileSizeBytes = buffer.length;\n const estimatedBitrate = 128000; // 128 kbps\n return (fileSizeBytes * 8) / estimatedBitrate;\n }\n\n // Estimate total duration based on file size and frame info\n const dataSize = buffer.length - offset;\n const avgBitrate = frameInfo.bitrate || 128000;\n const duration = (dataSize * 8) / avgBitrate;\n\n return duration > 0 ? duration : null;\n } catch (error) {\n // Final fallback\n const fileSizeBytes = buffer.length;\n const estimatedBitrate = 128000;\n return (fileSizeBytes * 8) / estimatedBitrate;\n }\n}\n\nfunction findXingHeader(buffer: Uint8Array, startOffset: number): number {\n const searchEnd = Math.min(buffer.length - 4, startOffset + 2048);\n for (let i = startOffset; i < searchEnd; i++) {\n if (\n buffer[i] === 0x58 && buffer[i + 1] === 0x69\n && buffer[i + 2] === 0x6E && buffer[i + 3] === 0x67\n ) { // \"Xing\"\n return i;\n }\n if (\n buffer[i] === 0x49 && buffer[i + 1] === 0x6E\n && buffer[i + 2] === 0x66 && buffer[i + 3] === 0x6F\n ) { // \"Info\"\n return i;\n }\n }\n return -1;\n}\n\nfunction parseXingHeader(buffer: Uint8Array, offset: number): number {\n if (offset + 16 > buffer.length) return 0;\n\n const flags = (buffer[offset + 7] << 24) | (buffer[offset + 6] << 16)\n | (buffer[offset + 5] << 8) | buffer[offset + 4];\n\n let pos = offset + 8;\n\n if (flags & 1) { // Frames field present\n const frames = (buffer[pos] << 24) | (buffer[pos + 1] << 16)\n | (buffer[pos + 2] << 8) | buffer[pos + 3];\n pos += 4;\n\n // Assume standard frame duration (26ms for 44.1kHz)\n return frames * 0.026;\n }\n\n return 0;\n}\n\nfunction parseFrameHeader(buffer: Uint8Array, offset: number): any {\n if (offset + 4 > buffer.length) return null;\n\n const header = (buffer[offset] << 24) | (buffer[offset + 1] << 16)\n | (buffer[offset + 2] << 8) | buffer[offset + 3];\n\n const version = (header >> 19) & 3;\n const layer = (header >> 17) & 3;\n const bitrateIndex = (header >> 12) & 15;\n const sampleRateIndex = (header >> 10) & 3;\n\n if (\n version === 1 || layer !== 1 || bitrateIndex === 0\n || bitrateIndex === 15 || sampleRateIndex === 3\n ) {\n return null;\n }\n\n // Bitrate table for MPEG-1 Layer III\n const bitrates = [0, 32, 40, 48, 56, 64, 80, 96, 112, 128, 160, 192, 224, 256, 320];\n const sampleRates = [44100, 48000, 32000];\n\n const bitrate = bitrates[bitrateIndex] * 1000;\n const sampleRate = sampleRates[sampleRateIndex];\n\n return { bitrate, sampleRate };\n}","deleted","label",[99],"permalink","https://www.val.town/x/fab1an/GetAudioLengthInSeconds/code/main.tsx","extension","actionData","errors"]