[FFmpeg-devel] [PATCH v3 03/03] libavdevice/avfoundation.m: Allow to select devices by unique ID.
Romain Beauxis
toots at rastageeks.org
Wed Dec 15 02:20:19 EET 2021
This is the third patch of a series of 3 that cleanup and enhance the
avfoundation implementation for libavdevice.
Changes since last version:
* Switched unique ID to use system-prodvided unique ID
* Implemented unique IDs for screen capture
This patch adds a unique ID to avfoundation devices. This
is needed because device index can change while the machine is running when
devices are plugged or unplugged and device names can be tricky to use with localization
and etc.
Signed-off-by: Romain Beauxis <toots at rastageeks.org>
---
doc/indevs.texi | 6 ++--
libavdevice/avfoundation.m | 73 +++++++++++++++++++++++++++++---------
2 files changed, 61 insertions(+), 18 deletions(-)
diff --git a/doc/indevs.texi b/doc/indevs.texi
index 5be647f70a..2b55399c8c 100644
--- a/doc/indevs.texi
+++ b/doc/indevs.texi
@@ -114,7 +114,7 @@ The input filename has to be given in the following syntax:
-i "[[VIDEO]:[AUDIO]]"
@end example
The first entry selects the video input while the latter selects the audio input.
-The stream has to be specified by the device name or the device index as shown by the device list.
+The stream has to be specified by the device name, index or ID as shown by the device list.
Alternatively, the video and/or audio input device can be chosen by index using the
@option{
-video_device_index <INDEX>
@@ -127,7 +127,9 @@ and/or
device name or index given in the input filename.
All available devices can be enumerated by using @option{-list_devices true}, listing
-all device names and corresponding indices.
+all device names, corresponding indices and IDs, when available. Device name can be
+tricky to use when localized and device index can change when devices are plugged or unplugged. A device
+hash, when available, uniquely identifies a device and should not change over time.
There are two device name aliases:
@table @code
diff --git a/libavdevice/avfoundation.m b/libavdevice/avfoundation.m
index b602cfbe95..036fb57568 100644
--- a/libavdevice/avfoundation.m
+++ b/libavdevice/avfoundation.m
@@ -39,6 +39,8 @@
#include "libavutil/imgutils.h"
#include "avdevice.h"
+#define CLEANUP_DEVICE_ID(s) [[s stringByReplacingOccurrencesOfString:@":" withString:@"."] UTF8String]
+
static const int avf_time_base = 1000000;
static const AVRational avf_time_base_q = {
@@ -797,21 +799,23 @@ static int avf_read_header(AVFormatContext *s)
int index = 0;
av_log(ctx, AV_LOG_INFO, "AVFoundation video devices:\n");
for (AVCaptureDevice *device in devices) {
- const char *name = [[device localizedName] UTF8String];
- index = [devices indexOfObject:device];
- av_log(ctx, AV_LOG_INFO, "[%d] %s\n", index, name);
+ const char *name = [[device localizedName] UTF8String];
+ const char *uniqueId = CLEANUP_DEVICE_ID([device uniqueID]);
+ index = [devices indexOfObject:device];
+ av_log(ctx, AV_LOG_INFO, "[%d] %s (ID: %s)\n", index, name, uniqueId);
}
for (AVCaptureDevice *device in devices_muxed) {
- const char *name = [[device localizedName] UTF8String];
- index = [devices count] + [devices_muxed indexOfObject:device];
- av_log(ctx, AV_LOG_INFO, "[%d] %s\n", index, name);
+ const char *name = [[device localizedName] UTF8String];
+ const char *uniqueId = CLEANUP_DEVICE_ID([device uniqueID]);
+ index = [devices count] + [devices_muxed indexOfObject:device];
+ av_log(ctx, AV_LOG_INFO, "[%d] %s (ID: %s)\n", index, name, uniqueId);
}
#if !TARGET_OS_IPHONE && __MAC_OS_X_VERSION_MIN_REQUIRED >= 1070
if (num_screens > 0) {
CGDirectDisplayID screens[num_screens];
CGGetActiveDisplayList(num_screens, screens, &num_screens);
for (int i = 0; i < num_screens; i++) {
- av_log(ctx, AV_LOG_INFO, "[%d] Capture screen %d\n", ctx->num_video_devices + i, i);
+ av_log(ctx, AV_LOG_INFO, "[%d] Capture screen %d (ID: AvfilterAvfoundationCptureScreen%d)\n", ctx->num_video_devices + i, i, screens[i]);
}
}
#endif
@@ -819,9 +823,10 @@ static int avf_read_header(AVFormatContext *s)
av_log(ctx, AV_LOG_INFO, "AVFoundation audio devices:\n");
devices = [AVCaptureDevice devicesWithMediaType:AVMediaTypeAudio];
for (AVCaptureDevice *device in devices) {
- const char *name = [[device localizedName] UTF8String];
- int index = [devices indexOfObject:device];
- av_log(ctx, AV_LOG_INFO, "[%d] %s\n", index, name);
+ const char *name = [[device localizedName] UTF8String];
+ const char *uniqueId = CLEANUP_DEVICE_ID([device uniqueID]);
+ int index = [devices indexOfObject:device];
+ av_log(ctx, AV_LOG_INFO, "[%d] %s (ID: %s)\n", index, name, uniqueId);
}
goto fail;
}
@@ -883,14 +888,30 @@ static int avf_read_header(AVFormatContext *s)
} else {
// looking for video inputs
for (AVCaptureDevice *device in devices) {
- if (!strncmp(ctx->video_filename, [[device localizedName] UTF8String], strlen(ctx->video_filename))) {
+ const char *name = [[device localizedName] UTF8String];
+ if (!strncmp(ctx->video_filename, name, strlen(ctx->video_filename))) {
+ video_device = device;
+ break;
+ }
+
+ const char *uniqueId = CLEANUP_DEVICE_ID([device uniqueID]);
+printf("uniqueID: %s, filename: %s\n", uniqueId, ctx->video_filename);
+ if (!strncmp(ctx->video_filename, uniqueId, strlen(ctx->video_filename))) {
video_device = device;
break;
}
}
// looking for muxed inputs
for (AVCaptureDevice *device in devices_muxed) {
- if (!strncmp(ctx->video_filename, [[device localizedName] UTF8String], strlen(ctx->video_filename))) {
+ const char *name = [[device localizedName] UTF8String];
+ if (!strncmp(ctx->video_filename, name, strlen(ctx->video_filename))) {
+ video_device = device;
+ ctx->video_is_muxed = 1;
+ break;
+ }
+
+ const char *uniqueId = CLEANUP_DEVICE_ID([device uniqueID]);
+ if (!strncmp(ctx->video_filename, uniqueId, strlen(ctx->video_filename))) {
video_device = device;
ctx->video_is_muxed = 1;
break;
@@ -901,10 +922,23 @@ static int avf_read_header(AVFormatContext *s)
// looking for screen inputs
if (!video_device) {
int idx;
+ CGDirectDisplayID screens[num_screens];
+ CGGetActiveDisplayList(num_screens, screens, &num_screens);
+ AVCaptureScreenInput* capture_screen_input = NULL;
+
if(sscanf(ctx->video_filename, "Capture screen %d", &idx) && idx < num_screens) {
- CGDirectDisplayID screens[num_screens];
- CGGetActiveDisplayList(num_screens, screens, &num_screens);
- AVCaptureScreenInput* capture_screen_input = [[[AVCaptureScreenInput alloc] initWithDisplayID:screens[idx]] autorelease];
+ capture_screen_input = [[[AVCaptureScreenInput alloc] initWithDisplayID:screens[idx]] autorelease];
+ }
+
+ if(sscanf(ctx->video_filename, "AvfilterAvfoundationCptureScreen%d", &idx)) {
+ for (int i = 0; i < num_screens; i++) {
+ if (screens[i] == idx) {
+ capture_screen_input = [[[AVCaptureScreenInput alloc] initWithDisplayID:idx] autorelease];
+ }
+ }
+ }
+
+ if (capture_screen_input) {
video_device = (AVCaptureDevice*) capture_screen_input;
ctx->video_device_index = ctx->num_video_devices + idx;
ctx->video_is_screen = 1;
@@ -955,7 +989,14 @@ static int avf_read_header(AVFormatContext *s)
NSArray *devices = [AVCaptureDevice devicesWithMediaType:AVMediaTypeAudio];
for (AVCaptureDevice *device in devices) {
- if (!strncmp(ctx->audio_filename, [[device localizedName] UTF8String], strlen(ctx->audio_filename))) {
+ const char *name = [[device localizedName] UTF8String];
+ if (!strncmp(ctx->audio_filename, name, strlen(ctx->audio_filename))) {
+ audio_device = device;
+ break;
+ }
+
+ const char *uniqueId = CLEANUP_DEVICE_ID([device uniqueID]);
+ if (!strncmp(ctx->audio_filename, uniqueId, strlen(ctx->audio_filename))) {
audio_device = device;
break;
}
--
2.30.1 (Apple Git-130)
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