|
| 1 | +package m3u8 |
| 2 | + |
| 3 | +import ( |
| 4 | + "bufio" |
| 5 | + "fmt" |
| 6 | + "io" |
| 7 | + "net/http" |
| 8 | + "net/url" |
| 9 | + "os" |
| 10 | + "os/exec" |
| 11 | + "path/filepath" |
| 12 | + "strings" |
| 13 | + |
| 14 | + "github.com/tanq16/danzo/utils" |
| 15 | +) |
| 16 | + |
| 17 | +func parseM3U8URL(rawURL string) (string, error) { |
| 18 | + actualURL := rawURL[7:] |
| 19 | + _, err := url.Parse(actualURL) |
| 20 | + if err != nil { |
| 21 | + return "", fmt.Errorf("invalid URL after m3u8:// prefix: %v", err) |
| 22 | + } |
| 23 | + return actualURL, nil |
| 24 | +} |
| 25 | + |
| 26 | +func getM3U8Contents(manifestURL string, client *http.Client) (string, error) { |
| 27 | + req, err := http.NewRequest("GET", manifestURL, nil) |
| 28 | + if err != nil { |
| 29 | + return "", fmt.Errorf("error creating request: %v", err) |
| 30 | + } |
| 31 | + resp, err := client.Do(req) |
| 32 | + if err != nil { |
| 33 | + return "", fmt.Errorf("error fetching m3u8 manifest: %v", err) |
| 34 | + } |
| 35 | + defer resp.Body.Close() |
| 36 | + if resp.StatusCode != http.StatusOK { |
| 37 | + return "", fmt.Errorf("server returned status code %d", resp.StatusCode) |
| 38 | + } |
| 39 | + content, err := io.ReadAll(resp.Body) |
| 40 | + if err != nil { |
| 41 | + return "", fmt.Errorf("error reading manifest content: %v", err) |
| 42 | + } |
| 43 | + return string(content), nil |
| 44 | +} |
| 45 | + |
| 46 | +func processM3U8Content(content, manifestURL string, client *http.Client) ([]string, error) { |
| 47 | + baseURL, err := url.Parse(manifestURL) |
| 48 | + if err != nil { |
| 49 | + return nil, fmt.Errorf("error parsing manifest URL: %v", err) |
| 50 | + } |
| 51 | + scanner := bufio.NewScanner(strings.NewReader(content)) |
| 52 | + var segmentURLs []string |
| 53 | + var masterPlaylistURLs []string |
| 54 | + var isMasterPlaylist bool |
| 55 | + for scanner.Scan() { |
| 56 | + line := strings.TrimSpace(scanner.Text()) |
| 57 | + // Skip empty lines and comments (except EXT-X-STREAM-INF) |
| 58 | + if line == "" || (strings.HasPrefix(line, "#") && !strings.Contains(line, "#EXT-X-STREAM-INF")) { |
| 59 | + continue |
| 60 | + } |
| 61 | + if strings.Contains(line, "#EXT-X-STREAM-INF") { |
| 62 | + isMasterPlaylist = true |
| 63 | + continue |
| 64 | + } |
| 65 | + // If not a comment, consider it a URL |
| 66 | + if !strings.HasPrefix(line, "#") { |
| 67 | + segmentURL, err := resolveURL(baseURL, line) |
| 68 | + if err != nil { |
| 69 | + return nil, fmt.Errorf("error resolving URL: %v", err) |
| 70 | + } |
| 71 | + if isMasterPlaylist { |
| 72 | + masterPlaylistURLs = append(masterPlaylistURLs, segmentURL) |
| 73 | + } else { |
| 74 | + segmentURLs = append(segmentURLs, segmentURL) |
| 75 | + } |
| 76 | + } |
| 77 | + } |
| 78 | + if err := scanner.Err(); err != nil { |
| 79 | + return nil, fmt.Errorf("error scanning m3u8 content: %v", err) |
| 80 | + } |
| 81 | + |
| 82 | + // For a master playlist, fetch the first playlist for highest quality |
| 83 | + if isMasterPlaylist && len(masterPlaylistURLs) > 0 { |
| 84 | + subContent, err := getM3U8Contents(masterPlaylistURLs[0], client) |
| 85 | + if err != nil { |
| 86 | + return nil, fmt.Errorf("error fetching sub-playlist: %v", err) |
| 87 | + } |
| 88 | + // Recursively process the sub-playlist |
| 89 | + return processM3U8Content(subContent, masterPlaylistURLs[0], client) |
| 90 | + } |
| 91 | + return segmentURLs, nil |
| 92 | +} |
| 93 | + |
| 94 | +func resolveURL(baseURL *url.URL, urlStr string) (string, error) { |
| 95 | + if strings.HasPrefix(urlStr, "http://") || strings.HasPrefix(urlStr, "https://") { |
| 96 | + return urlStr, nil // Already an absolute URL |
| 97 | + } |
| 98 | + relURL, err := url.Parse(urlStr) |
| 99 | + if err != nil { |
| 100 | + return "", err |
| 101 | + } |
| 102 | + absURL := baseURL.ResolveReference(relURL) |
| 103 | + return absURL.String(), nil |
| 104 | +} |
| 105 | + |
| 106 | +func downloadM3U8Segments(segmentURLs []string, outputDir string, client *http.Client, streamCh chan<- string) ([]string, error) { |
| 107 | + if err := os.MkdirAll(outputDir, 0755); err != nil { |
| 108 | + return nil, fmt.Errorf("error creating output directory: %v", err) |
| 109 | + } |
| 110 | + var downloadedFiles []string |
| 111 | + for i, segmentURL := range segmentURLs { |
| 112 | + outputPath := filepath.Join(outputDir, fmt.Sprintf("segment_%04d.ts", i)) |
| 113 | + req, err := http.NewRequest("GET", segmentURL, nil) |
| 114 | + if err != nil { |
| 115 | + return downloadedFiles, fmt.Errorf("error creating request for segment %d: %v", i, err) |
| 116 | + } |
| 117 | + resp, err := client.Do(req) |
| 118 | + if err != nil { |
| 119 | + return downloadedFiles, fmt.Errorf("error downloading segment %d: %v", i, err) |
| 120 | + } |
| 121 | + outFile, err := os.Create(outputPath) |
| 122 | + if err != nil { |
| 123 | + resp.Body.Close() |
| 124 | + return downloadedFiles, fmt.Errorf("error creating output file for segment %d: %v", i, err) |
| 125 | + } |
| 126 | + n, err := io.Copy(outFile, resp.Body) |
| 127 | + resp.Body.Close() |
| 128 | + outFile.Close() |
| 129 | + if err != nil { |
| 130 | + return downloadedFiles, fmt.Errorf("error writing segment %d: %v", i, err) |
| 131 | + } |
| 132 | + streamCh <- fmt.Sprintf("Downloaded segment %d of %d", i+1, len(segmentURLs)) |
| 133 | + streamCh <- fmt.Sprintf("Downloaded %s", utils.FormatBytes(uint64(n))) |
| 134 | + downloadedFiles = append(downloadedFiles, outputPath) |
| 135 | + } |
| 136 | + return downloadedFiles, nil |
| 137 | +} |
| 138 | + |
| 139 | +func mergeSegments(segmentFiles []string, outputPath string) error { |
| 140 | + tempListFile := filepath.Join(filepath.Dir(outputPath), ".segment_list.txt") |
| 141 | + f, err := os.Create(tempListFile) |
| 142 | + if err != nil { |
| 143 | + return fmt.Errorf("error creating segment list file: %v", err) |
| 144 | + } |
| 145 | + for _, file := range segmentFiles { |
| 146 | + fmt.Fprintf(f, "file '%s'\n", file) |
| 147 | + } |
| 148 | + f.Close() |
| 149 | + cmd := exec.Command( |
| 150 | + "ffmpeg", |
| 151 | + "-f", "concat", |
| 152 | + "-safe", "0", |
| 153 | + "-i", tempListFile, |
| 154 | + "-c", "copy", |
| 155 | + "-y", // Overwrite output files without asking |
| 156 | + outputPath, |
| 157 | + ) |
| 158 | + output, err := cmd.CombinedOutput() |
| 159 | + if err != nil { |
| 160 | + return fmt.Errorf("ffmpeg error: %v\nOutput: %s", err, string(output)) |
| 161 | + } |
| 162 | + os.Remove(tempListFile) |
| 163 | + return nil |
| 164 | +} |
| 165 | + |
| 166 | +func cleanupSegments(segmentFiles []string) { |
| 167 | + for _, file := range segmentFiles { |
| 168 | + os.Remove(file) |
| 169 | + } |
| 170 | + if len(segmentFiles) > 0 { |
| 171 | + dir := filepath.Dir(segmentFiles[0]) |
| 172 | + os.Remove(dir) // only succeeds if empty |
| 173 | + } |
| 174 | +} |
| 175 | + |
| 176 | +func PerformM3U8Download(config utils.DownloadConfig, client *http.Client, streamCh chan<- string) error { |
| 177 | + manifestURL, err := parseM3U8URL(config.URL) |
| 178 | + if err != nil { |
| 179 | + return fmt.Errorf("error parsing m3u8 URL: %v", err) |
| 180 | + } |
| 181 | + streamCh <- "Fetching M3U8 manifest" |
| 182 | + manifestContent, err := getM3U8Contents(manifestURL, client) |
| 183 | + if err != nil { |
| 184 | + return fmt.Errorf("error getting m3u8 manifest: %v", err) |
| 185 | + } |
| 186 | + streamCh <- "Processing M3U8 manifest..." |
| 187 | + segmentURLs, err := processM3U8Content(manifestContent, manifestURL, client) |
| 188 | + if err != nil { |
| 189 | + return fmt.Errorf("error processing m3u8 content: %v", err) |
| 190 | + } |
| 191 | + streamCh <- fmt.Sprintf("Found %d segments to download", len(segmentURLs)) |
| 192 | + tempDir := filepath.Join(filepath.Dir(config.OutputPath), ".danzo-temp") |
| 193 | + streamCh <- "Downloading segments..." |
| 194 | + segmentFiles, err := downloadM3U8Segments(segmentURLs, tempDir, client, streamCh) |
| 195 | + if err != nil { |
| 196 | + return fmt.Errorf("error downloading segments: %v", err) |
| 197 | + } |
| 198 | + streamCh <- "Merging segments..." |
| 199 | + if err := mergeSegments(segmentFiles, config.OutputPath); err != nil { |
| 200 | + return fmt.Errorf("error merging segments: %v", err) |
| 201 | + } |
| 202 | + streamCh <- "Cleaning up temporary files..." |
| 203 | + cleanupSegments(segmentFiles) |
| 204 | + return nil |
| 205 | +} |
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