mirror of
https://github.com/pion/mediadevices.git
synced 2026-04-22 15:57:27 +08:00
sean yu
03900dcb1b
* wip * wip * Organize * Remove unnecessary change in camera_darwin.go filtering * wip * Make observer stop safe during startup * wip IsAvailable impl * Fix non-darwin builds * Lock bg loop to main thread and add comment * Remove fmt prints * Simplify isAvailable; Add timeout for Read darwin * Match comment with code * Change to singleton pattern; Add clearer safer state machine states; Change language from Stop to Destroy; Add new error for when observer is unavailable; * Add stubs for linux * Move cancel() up so its not dead code sometimes * Add stubs for Windows too * Remove StopObserver usage * Add camera tests * Add device observer tests * Fix multiple destroy calls bug; Call setup in start * Improve isAvailable * Improve string handling in device observer c * Add error handling in example * Add comment about setup vs start * Rename and organize device observer darwin * Explicitly case initial state for setup * Fix potential destroy goroutine leak; Use only modern build tag; Return err not nil for stubs; Improve comments * Close startDone channel on device observer stop not wait
71 lines
1.6 KiB
Go
71 lines
1.6 KiB
Go
package main
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import (
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"bufio"
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"fmt"
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"os"
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"strings"
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"github.com/pion/mediadevices/pkg/driver"
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"github.com/pion/mediadevices/pkg/driver/camera"
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)
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func main() {
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fmt.Println("This example demonstrates query-based camera device discovery on Darwin.")
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fmt.Println("The background observer automatically updates the manager's device list")
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fmt.Println("when cameras are connected or disconnected.")
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// Calling StartObserver without calling SetupObserver prior implicitly calls SetupObserver
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// due to state machine internals. We make SetupObserver and StartObserver distinct because
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// not all downstream programs will want to start pumping the NSRunLoop to handle events immediately.
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err := camera.StartObserver()
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if err != nil {
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fmt.Printf("failed to start observer: %v\n", err)
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}
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defer func() {
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err := camera.DestroyObserver()
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if err != nil {
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fmt.Printf("failed to destroy observer: %v\n", err)
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}
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}()
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scanner := bufio.NewScanner(os.Stdin)
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queryCount := 0
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queryDevices(0)
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for {
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fmt.Print("\nPress Enter to query (or 'q' to exit): ")
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if !scanner.Scan() {
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break
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}
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input := strings.TrimSpace(scanner.Text())
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if strings.ToLower(input) == "q" {
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break
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}
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queryCount++
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queryDevices(queryCount)
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}
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}
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func queryDevices(count int) {
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if count > 0 {
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fmt.Printf("Query #%d\n", count)
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}
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devices := driver.GetManager().Query(driver.FilterVideoRecorder())
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if len(devices) == 0 {
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fmt.Println("No video devices found.")
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} else {
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fmt.Printf("Found %d video device(s):\n", len(devices))
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for i, d := range devices {
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info := d.Info()
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fmt.Printf(" %d. %s [%s]\n", i+1, info.Name, info.Label)
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}
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}
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}
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