summaryrefslogtreecommitdiff
path: root/libavdevice/qtkit.m
blob: aa8fa167878dc70c6124b363ced795c9c68f00e1 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
/*
 * QTKit input device
 * Copyright (c) 2013 Vadim Kalinsky <vadim@kalinsky.ru>
 *
 * This file is part of FFmpeg.
 *
 * FFmpeg is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * FFmpeg is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with FFmpeg; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

/**
 * @file
 * QTKit input device
 * @author Vadim Kalinsky <vadim@kalinsky.ru>
 */

#import <QTKit/QTKit.h>
#include <pthread.h>

#include "libavutil/pixdesc.h"
#include "libavutil/opt.h"
#include "libavformat/internal.h"
#include "libavutil/internal.h"
#include "libavutil/time.h"
#include "avdevice.h"

#define QTKIT_TIMEBASE 100

static const AVRational kQTKitTimeBase_q = {
    .num = 1,
    .den = QTKIT_TIMEBASE
};

typedef struct
{
    AVClass*        class;

    float           frame_rate;
    int             frames_captured;
    int64_t         first_pts;
    pthread_mutex_t frame_lock;
    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;
} CaptureContext;

static void lock_frames(CaptureContext* ctx)
{
    pthread_mutex_lock(&ctx->frame_lock);
}

static void unlock_frames(CaptureContext* ctx)
{
    pthread_mutex_unlock(&ctx->frame_lock);
}

/** FrameReciever class - delegate for QTCaptureSession
 */
@interface FFMPEG_FrameReceiver : NSObject
{
    CaptureContext* _context;
}

- (id)initWithContext:(CaptureContext*)context;

- (void)captureOutput:(QTCaptureOutput *)captureOutput
  didOutputVideoFrame:(CVImageBufferRef)videoFrame
     withSampleBuffer:(QTSampleBuffer *)sampleBuffer
       fromConnection:(QTCaptureConnection *)connection;

@end

@implementation FFMPEG_FrameReceiver

- (id)initWithContext:(CaptureContext*)context
{
    if (self = [super init]) {
        _context = context;
    }
    return self;
}

- (void)captureOutput:(QTCaptureOutput *)captureOutput
  didOutputVideoFrame:(CVImageBufferRef)videoFrame
     withSampleBuffer:(QTSampleBuffer *)sampleBuffer
       fromConnection:(QTCaptureConnection *)connection
{
    lock_frames(_context);
    if (_context->current_frame != nil) {
        CVBufferRelease(_context->current_frame);
    }

    _context->current_frame = CVBufferRetain(videoFrame);

    pthread_cond_signal(&_context->frame_wait_cond);

    unlock_frames(_context);

    ++_context->frames_captured;
}

@end

static void destroy_context(CaptureContext* ctx)
{
    [ctx->capture_session stopRunning];

    [ctx->capture_session release];
    [ctx->video_output    release];
    [ctx->qt_delegate     release];

    ctx->capture_session = NULL;
    ctx->video_output    = NULL;
    ctx->qt_delegate     = NULL;

    pthread_mutex_destroy(&ctx->frame_lock);
    pthread_cond_destroy(&ctx->frame_wait_cond);

    if (ctx->current_frame)
        CVBufferRelease(ctx->current_frame);
}

static int qtkit_read_header(AVFormatContext *s)
{
    NSAutoreleasePool* pool = [[NSAutoreleasePool alloc] init];

    CaptureContext* ctx = (CaptureContext*)s->priv_data;

    ctx->first_pts = av_gettime();

    pthread_mutex_init(&ctx->frame_lock, NULL);
    pthread_cond_init(&ctx->frame_wait_cond, NULL);

    // 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];

    // Video capture device not found, looking for QTMediaTypeVideo
    if (!success) {
        video_device = [QTCaptureDevice defaultInputDeviceWithMediaType:QTMediaTypeVideo];
        success      = [video_device open:nil];

        if (!success) {
            av_log(s, AV_LOG_ERROR, "No QT capture device found\n");
            goto fail;
        }
    }

    NSString* dev_display_name = [video_device localizedDisplayName];
    av_log (s, AV_LOG_DEBUG, "'%s' opened\n", [dev_display_name UTF8String]);

    // Initialize capture session
    ctx->capture_session = [[QTCaptureSession alloc] init];

    QTCaptureDeviceInput* capture_dev_input = [[[QTCaptureDeviceInput alloc] initWithDevice:video_device] autorelease];
    success = [ctx->capture_session addInput:capture_dev_input error:nil];

    if (!success) {
        av_log (s, AV_LOG_ERROR, "Failed to add QT capture device to session\n");
        goto fail;
    }

    // Attaching output
    // FIXME: Allow for a user defined pixel format
    ctx->video_output = [[QTCaptureDecompressedVideoOutput alloc] init];

    NSDictionary *captureDictionary = [NSDictionary dictionaryWithObject:
                                       [NSNumber numberWithUnsignedInt:kCVPixelFormatType_24RGB]
                                       forKey:(id)kCVPixelBufferPixelFormatTypeKey];

    [ctx->video_output setPixelBufferAttributes:captureDictionary];

    ctx->qt_delegate = [[FFMPEG_FrameReceiver alloc] initWithContext:ctx];

    [ctx->video_output setDelegate:ctx->qt_delegate];
    [ctx->video_output setAutomaticallyDropsLateVideoFrames:YES];
    [ctx->video_output setMinimumVideoFrameInterval:1.0/ctx->frame_rate];

    success = [ctx->capture_session addOutput:ctx->video_output error:nil];

    if (!success) {
        av_log (s, AV_LOG_ERROR, "can't add video output to capture session\n");
        goto fail;
    }

    [ctx->capture_session startRunning];

    // Take stream info from the first frame.
    while (ctx->frames_captured < 1) {
        CFRunLoopRunInMode(kCFRunLoopDefaultMode, 0.1, YES);
    }

    lock_frames(ctx);

    AVStream* stream = avformat_new_stream(s, NULL);

    if (!stream) {
        goto fail;
    }

    avpriv_set_pts_info(stream, 64, 1, QTKIT_TIMEBASE);

    stream->codec->codec_id   = AV_CODEC_ID_RAWVIDEO;
    stream->codec->codec_type = AVMEDIA_TYPE_VIDEO;
    stream->codec->width      = (int)CVPixelBufferGetWidth (ctx->current_frame);
    stream->codec->height     = (int)CVPixelBufferGetHeight(ctx->current_frame);
    stream->codec->pix_fmt    = AV_PIX_FMT_RGB24;

    CVBufferRelease(ctx->current_frame);
    ctx->current_frame = nil;

    unlock_frames(ctx);

    [pool release];

    return 0;

fail:
    [pool release];

    destroy_context(ctx);

    return AVERROR(EIO);
}

static int qtkit_read_packet(AVFormatContext *s, AVPacket *pkt)
{
    CaptureContext* ctx = (CaptureContext*)s->priv_data;

    do {
        lock_frames(ctx);

        if (ctx->current_frame != nil) {
            if (av_new_packet(pkt, (int)CVPixelBufferGetDataSize(ctx->current_frame)) < 0) {
                return AVERROR(EIO);
            }

            pkt->pts = pkt->dts = av_rescale_q(av_gettime() - ctx->first_pts, AV_TIME_BASE_Q, kQTKitTimeBase_q);
            pkt->stream_index = 0;
            pkt->flags |= AV_PKT_FLAG_KEY;

            CVPixelBufferLockBaseAddress(ctx->current_frame, 0);

            void* data = CVPixelBufferGetBaseAddress(ctx->current_frame);
            memcpy(pkt->data, data, pkt->size);

            CVPixelBufferUnlockBaseAddress(ctx->current_frame, 0);
            CVBufferRelease(ctx->current_frame);
            ctx->current_frame = nil;
        } else {
            pkt->data = NULL;
            pthread_cond_wait(&ctx->frame_wait_cond, &ctx->frame_lock);
        }

        unlock_frames(ctx);
    } while (!pkt->data);

    return 0;
}

static int qtkit_close(AVFormatContext *s)
{
    CaptureContext* ctx = (CaptureContext*)s->priv_data;

    destroy_context(ctx);

    return 0;
}

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 },
};

static const AVClass qtkit_class = {
    .class_name = "QTKit input device",
    .item_name  = av_default_item_name,
    .option     = options,
    .version    = LIBAVUTIL_VERSION_INT,
    .category   = AV_CLASS_CATEGORY_DEVICE_VIDEO_INPUT,
};

AVInputFormat ff_qtkit_demuxer = {
    .name           = "qtkit",
    .long_name      = NULL_IF_CONFIG_SMALL("QTKit input device"),
    .priv_data_size = sizeof(CaptureContext),
    .read_header    = qtkit_read_header,
    .read_packet    = qtkit_read_packet,
    .read_close     = qtkit_close,
    .flags          = AVFMT_NOFILE,
    .priv_class     = &qtkit_class,
};