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lavd/qtkit: Support choosing the input device by index or by name. 

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Thilo Borgmann 2014-04-02 22:24:36 +02:00 committed by Michael Niedermayer
parent 23d1c75efa
commit 4654774aaf
2 changed files with 71 additions and 3 deletions
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19
doc/indevs.texi
View File

@ -535,12 +535,29 @@ ffmpeg -f pulse -i default /tmp/pulse.wav
QTKit input device.
The filename passed as input is unused. The default device will be chosen.
The filename passed as input is parsed to contain either a device name or index.
The device index can also be given by using -video_device_index.
A given device index will override any given device name.
If the desired device consists of numbers only, use -video_device_index to identify it.
The default device will be chosen if an empty string or the device name "default" is given.
The available devices can be enumerated by using -list_devices.
@example
ffmpeg -f qtkit -i "0" out.mpg
@end example
@example
ffmpeg -f qtkit -video_device_index 0 -i "" out.mpg
@end example
@example
ffmpeg -f qtkit -i "default" out.mpg
@end example
@example
ffmpeg -f qtkit -list_devices true -i ""
@end example
@section sndio
sndio input device.

55
libavdevice/qtkit.m
View File

@ -53,6 +53,9 @@ typedef struct
pthread_cond_t frame_wait_cond;
id qt_delegate;
int list_devices;
int video_device_index;
QTCaptureSession* capture_session;
QTCaptureDecompressedVideoOutput* video_output;
CVImageBufferRef current_frame;
@ -145,8 +148,52 @@ static int qtkit_read_header(AVFormatContext *s)
pthread_mutex_init(&ctx->frame_lock, NULL);
pthread_cond_init(&ctx->frame_wait_cond, NULL);
// Find default capture device
QTCaptureDevice *video_device = [QTCaptureDevice defaultInputDeviceWithMediaType:QTMediaTypeMuxed];
// List devices if requested
if (ctx->list_devices) {
av_log(ctx, AV_LOG_INFO, "QTKit video devices:\n");
NSArray *devices = [QTCaptureDevice inputDevicesWithMediaType:QTMediaTypeVideo];
for (QTCaptureDevice *device in devices) {
const char *name = [[device localizedDisplayName] UTF8String];
int index = [devices indexOfObject:device];
av_log(ctx, AV_LOG_INFO, "[%d] %s\n", index, name);
}
goto fail;
}
// Find capture device
QTCaptureDevice *video_device = nil;
// check for device index given in filename
if (ctx->video_device_index == -1) {
sscanf(s->filename, "%d", &ctx->video_device_index);
}
if (ctx->video_device_index >= 0) {
NSArray *devices = [QTCaptureDevice inputDevicesWithMediaType:QTMediaTypeVideo];
if (ctx->video_device_index >= [devices count]) {
av_log(ctx, AV_LOG_ERROR, "Invalid device index\n");
goto fail;
}
video_device = [devices objectAtIndex:ctx->video_device_index];
} else if (strncmp(s->filename, "", 1) &&
strncmp(s->filename, "default", 7)) {
NSArray *devices = [QTCaptureDevice inputDevicesWithMediaType:QTMediaTypeVideo];
for (QTCaptureDevice *device in devices) {
if (!strncmp(s->filename, [[device localizedDisplayName] UTF8String], strlen(s->filename))) {
video_device = device;
break;
}
}
if (!video_device) {
av_log(ctx, AV_LOG_ERROR, "Video device not found\n");
goto fail;
}
} else {
video_device = [QTCaptureDevice defaultInputDeviceWithMediaType:QTMediaTypeMuxed];
}
BOOL success = [video_device open:nil];
@ -284,6 +331,10 @@ static int qtkit_close(AVFormatContext *s)
static const AVOption options[] = {
{ "frame_rate", "set frame rate", offsetof(CaptureContext, frame_rate), AV_OPT_TYPE_FLOAT, { .dbl = 30.0 }, 0.1, 30.0, AV_OPT_TYPE_VIDEO_RATE, NULL },
{ "list_devices", "list available devices", offsetof(CaptureContext, list_devices), AV_OPT_TYPE_INT, {.i64=0}, 0, 1, AV_OPT_FLAG_DECODING_PARAM, "list_devices" },
{ "true", "", 0, AV_OPT_TYPE_CONST, {.i64=1}, 0, 0, AV_OPT_FLAG_DECODING_PARAM, "list_devices" },
{ "false", "", 0, AV_OPT_TYPE_CONST, {.i64=0}, 0, 0, AV_OPT_FLAG_DECODING_PARAM, "list_devices" },
{ "video_device_index", "select video device by index for devices with same name (starts at 0)", offsetof(CaptureContext, video_device_index), AV_OPT_TYPE_INT, {.i64 = -1}, -1, INT_MAX, AV_OPT_FLAG_DECODING_PARAM },
{ NULL },
};