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path: root/libavdevice/qtkit.m (plain)
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1/*
2 * QTKit input device
3 * Copyright (c) 2013 Vadim Kalinsky <vadim@kalinsky.ru>
4 *
5 * This file is part of FFmpeg.
6 *
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
11 *
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
22/**
23 * @file
24 * QTKit input device
25 * @author Vadim Kalinsky <vadim@kalinsky.ru>
26 */
27
28#if defined(__clang__)
29#pragma clang diagnostic ignored "-Wdeprecated-declarations"
30#endif
31
32#import <QTKit/QTKit.h>
33#include <pthread.h>
34
35#include "libavutil/pixdesc.h"
36#include "libavutil/opt.h"
37#include "libavformat/internal.h"
38#include "libavutil/internal.h"
39#include "libavutil/time.h"
40#include "avdevice.h"
41
42#define QTKIT_TIMEBASE 100
43
44static const AVRational kQTKitTimeBase_q = {
45 .num = 1,
46 .den = QTKIT_TIMEBASE
47};
48
49typedef struct
50{
51 AVClass* class;
52
53 float frame_rate;
54 int frames_captured;
55 int64_t first_pts;
56 pthread_mutex_t frame_lock;
57 pthread_cond_t frame_wait_cond;
58 id qt_delegate;
59
60 int list_devices;
61 int video_device_index;
62
63 QTCaptureSession* capture_session;
64 QTCaptureDecompressedVideoOutput* video_output;
65 CVImageBufferRef current_frame;
66} CaptureContext;
67
68static void lock_frames(CaptureContext* ctx)
69{
70 pthread_mutex_lock(&ctx->frame_lock);
71}
72
73static void unlock_frames(CaptureContext* ctx)
74{
75 pthread_mutex_unlock(&ctx->frame_lock);
76}
77
78/** FrameReciever class - delegate for QTCaptureSession
79 */
80@interface FFMPEG_FrameReceiver : NSObject
81{
82 CaptureContext* _context;
83}
84
85- (id)initWithContext:(CaptureContext*)context;
86
87- (void)captureOutput:(QTCaptureOutput *)captureOutput
88 didOutputVideoFrame:(CVImageBufferRef)videoFrame
89 withSampleBuffer:(QTSampleBuffer *)sampleBuffer
90 fromConnection:(QTCaptureConnection *)connection;
91
92@end
93
94@implementation FFMPEG_FrameReceiver
95
96- (id)initWithContext:(CaptureContext*)context
97{
98 if (self = [super init]) {
99 _context = context;
100 }
101 return self;
102}
103
104- (void)captureOutput:(QTCaptureOutput *)captureOutput
105 didOutputVideoFrame:(CVImageBufferRef)videoFrame
106 withSampleBuffer:(QTSampleBuffer *)sampleBuffer
107 fromConnection:(QTCaptureConnection *)connection
108{
109 lock_frames(_context);
110 if (_context->current_frame != nil) {
111 CVBufferRelease(_context->current_frame);
112 }
113
114 _context->current_frame = CVBufferRetain(videoFrame);
115
116 pthread_cond_signal(&_context->frame_wait_cond);
117
118 unlock_frames(_context);
119
120 ++_context->frames_captured;
121}
122
123@end
124
125static void destroy_context(CaptureContext* ctx)
126{
127 [ctx->capture_session stopRunning];
128
129 [ctx->capture_session release];
130 [ctx->video_output release];
131 [ctx->qt_delegate release];
132
133 ctx->capture_session = NULL;
134 ctx->video_output = NULL;
135 ctx->qt_delegate = NULL;
136
137 pthread_mutex_destroy(&ctx->frame_lock);
138 pthread_cond_destroy(&ctx->frame_wait_cond);
139
140 if (ctx->current_frame)
141 CVBufferRelease(ctx->current_frame);
142}
143
144static int qtkit_read_header(AVFormatContext *s)
145{
146 NSAutoreleasePool* pool = [[NSAutoreleasePool alloc] init];
147
148 CaptureContext* ctx = (CaptureContext*)s->priv_data;
149
150 ctx->first_pts = av_gettime();
151
152 pthread_mutex_init(&ctx->frame_lock, NULL);
153 pthread_cond_init(&ctx->frame_wait_cond, NULL);
154
155 // List devices if requested
156 if (ctx->list_devices) {
157 av_log(ctx, AV_LOG_INFO, "QTKit video devices:\n");
158 NSArray *devices = [QTCaptureDevice inputDevicesWithMediaType:QTMediaTypeVideo];
159 for (QTCaptureDevice *device in devices) {
160 const char *name = [[device localizedDisplayName] UTF8String];
161 int index = [devices indexOfObject:device];
162 av_log(ctx, AV_LOG_INFO, "[%d] %s\n", index, name);
163 }
164 goto fail;
165 }
166
167 // Find capture device
168 QTCaptureDevice *video_device = nil;
169
170 // check for device index given in filename
171 if (ctx->video_device_index == -1) {
172 sscanf(s->filename, "%d", &ctx->video_device_index);
173 }
174
175 if (ctx->video_device_index >= 0) {
176 NSArray *devices = [QTCaptureDevice inputDevicesWithMediaType:QTMediaTypeVideo];
177
178 if (ctx->video_device_index >= [devices count]) {
179 av_log(ctx, AV_LOG_ERROR, "Invalid device index\n");
180 goto fail;
181 }
182
183 video_device = [devices objectAtIndex:ctx->video_device_index];
184 } else if (strncmp(s->filename, "", 1) &&
185 strncmp(s->filename, "default", 7)) {
186 NSArray *devices = [QTCaptureDevice inputDevicesWithMediaType:QTMediaTypeVideo];
187
188 for (QTCaptureDevice *device in devices) {
189 if (!strncmp(s->filename, [[device localizedDisplayName] UTF8String], strlen(s->filename))) {
190 video_device = device;
191 break;
192 }
193 }
194 if (!video_device) {
195 av_log(ctx, AV_LOG_ERROR, "Video device not found\n");
196 goto fail;
197 }
198 } else {
199 video_device = [QTCaptureDevice defaultInputDeviceWithMediaType:QTMediaTypeMuxed];
200 }
201
202 BOOL success = [video_device open:nil];
203
204 // Video capture device not found, looking for QTMediaTypeVideo
205 if (!success) {
206 video_device = [QTCaptureDevice defaultInputDeviceWithMediaType:QTMediaTypeVideo];
207 success = [video_device open:nil];
208
209 if (!success) {
210 av_log(s, AV_LOG_ERROR, "No QT capture device found\n");
211 goto fail;
212 }
213 }
214
215 NSString* dev_display_name = [video_device localizedDisplayName];
216 av_log (s, AV_LOG_DEBUG, "'%s' opened\n", [dev_display_name UTF8String]);
217
218 // Initialize capture session
219 ctx->capture_session = [[QTCaptureSession alloc] init];
220
221 QTCaptureDeviceInput* capture_dev_input = [[[QTCaptureDeviceInput alloc] initWithDevice:video_device] autorelease];
222 success = [ctx->capture_session addInput:capture_dev_input error:nil];
223
224 if (!success) {
225 av_log (s, AV_LOG_ERROR, "Failed to add QT capture device to session\n");
226 goto fail;
227 }
228
229 // Attaching output
230 // FIXME: Allow for a user defined pixel format
231 ctx->video_output = [[QTCaptureDecompressedVideoOutput alloc] init];
232
233 NSDictionary *captureDictionary = [NSDictionary dictionaryWithObject:
234 [NSNumber numberWithUnsignedInt:kCVPixelFormatType_24RGB]
235 forKey:(id)kCVPixelBufferPixelFormatTypeKey];
236
237 [ctx->video_output setPixelBufferAttributes:captureDictionary];
238
239 ctx->qt_delegate = [[FFMPEG_FrameReceiver alloc] initWithContext:ctx];
240
241 [ctx->video_output setDelegate:ctx->qt_delegate];
242 [ctx->video_output setAutomaticallyDropsLateVideoFrames:YES];
243 [ctx->video_output setMinimumVideoFrameInterval:1.0/ctx->frame_rate];
244
245 success = [ctx->capture_session addOutput:ctx->video_output error:nil];
246
247 if (!success) {
248 av_log (s, AV_LOG_ERROR, "can't add video output to capture session\n");
249 goto fail;
250 }
251
252 [ctx->capture_session startRunning];
253
254 // Take stream info from the first frame.
255 while (ctx->frames_captured < 1) {
256 CFRunLoopRunInMode(kCFRunLoopDefaultMode, 0.1, YES);
257 }
258
259 lock_frames(ctx);
260
261 AVStream* stream = avformat_new_stream(s, NULL);
262
263 if (!stream) {
264 goto fail;
265 }
266
267 avpriv_set_pts_info(stream, 64, 1, QTKIT_TIMEBASE);
268
269 stream->codec->codec_id = AV_CODEC_ID_RAWVIDEO;
270 stream->codec->codec_type = AVMEDIA_TYPE_VIDEO;
271 stream->codec->width = (int)CVPixelBufferGetWidth (ctx->current_frame);
272 stream->codec->height = (int)CVPixelBufferGetHeight(ctx->current_frame);
273 stream->codec->pix_fmt = AV_PIX_FMT_RGB24;
274
275 CVBufferRelease(ctx->current_frame);
276 ctx->current_frame = nil;
277
278 unlock_frames(ctx);
279
280 [pool release];
281
282 return 0;
283
284fail:
285 [pool release];
286
287 destroy_context(ctx);
288
289 return AVERROR(EIO);
290}
291
292static int qtkit_read_packet(AVFormatContext *s, AVPacket *pkt)
293{
294 CaptureContext* ctx = (CaptureContext*)s->priv_data;
295
296 do {
297 lock_frames(ctx);
298
299 if (ctx->current_frame != nil) {
300 if (av_new_packet(pkt, (int)CVPixelBufferGetDataSize(ctx->current_frame)) < 0) {
301 return AVERROR(EIO);
302 }
303
304 pkt->pts = pkt->dts = av_rescale_q(av_gettime() - ctx->first_pts, AV_TIME_BASE_Q, kQTKitTimeBase_q);
305 pkt->stream_index = 0;
306 pkt->flags |= AV_PKT_FLAG_KEY;
307
308 CVPixelBufferLockBaseAddress(ctx->current_frame, 0);
309
310 void* data = CVPixelBufferGetBaseAddress(ctx->current_frame);
311 memcpy(pkt->data, data, pkt->size);
312
313 CVPixelBufferUnlockBaseAddress(ctx->current_frame, 0);
314 CVBufferRelease(ctx->current_frame);
315 ctx->current_frame = nil;
316 } else {
317 pkt->data = NULL;
318 pthread_cond_wait(&ctx->frame_wait_cond, &ctx->frame_lock);
319 }
320
321 unlock_frames(ctx);
322 } while (!pkt->data);
323
324 return 0;
325}
326
327static int qtkit_close(AVFormatContext *s)
328{
329 CaptureContext* ctx = (CaptureContext*)s->priv_data;
330
331 destroy_context(ctx);
332
333 return 0;
334}
335
336static const AVOption options[] = {
337 { "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 },
338 { "list_devices", "list available devices", offsetof(CaptureContext, list_devices), AV_OPT_TYPE_INT, {.i64=0}, 0, 1, AV_OPT_FLAG_DECODING_PARAM, "list_devices" },
339 { "true", "", 0, AV_OPT_TYPE_CONST, {.i64=1}, 0, 0, AV_OPT_FLAG_DECODING_PARAM, "list_devices" },
340 { "false", "", 0, AV_OPT_TYPE_CONST, {.i64=0}, 0, 0, AV_OPT_FLAG_DECODING_PARAM, "list_devices" },
341 { "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 },
342 { NULL },
343};
344
345static const AVClass qtkit_class = {
346 .class_name = "QTKit input device",
347 .item_name = av_default_item_name,
348 .option = options,
349 .version = LIBAVUTIL_VERSION_INT,
350 .category = AV_CLASS_CATEGORY_DEVICE_VIDEO_INPUT,
351};
352
353AVInputFormat ff_qtkit_demuxer = {
354 .name = "qtkit",
355 .long_name = NULL_IF_CONFIG_SMALL("QTKit input device"),
356 .priv_data_size = sizeof(CaptureContext),
357 .read_header = qtkit_read_header,
358 .read_packet = qtkit_read_packet,
359 .read_close = qtkit_close,
360 .flags = AVFMT_NOFILE,
361 .priv_class = &qtkit_class,
362};
363
generated by cgit at 2024-05-17 05:00:31 (GMT)