avcapture.m 15.4 KB
Newer Older
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
/*****************************************************************************
 * avcapture.m: AVFoundation (Mac OS X) based video capture module
 *****************************************************************************
 * Copyright © 2008-2013 VLC authors and VideoLAN
 *
 * Authors: Michael Feurstein <michael.feurstein@gmail.com>
 *
 ****************************************************************************
 * This program 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.
 *
 * This program 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 this program; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
 *****************************************************************************/

/*****************************************************************************
 * Preamble
 *****************************************************************************/

#ifdef HAVE_CONFIG_H
# include "config.h"
#endif

#include <vlc_common.h>
#include <vlc_plugin.h>
#include <vlc_input.h>
#include <vlc_demux.h>
#include <vlc_interface.h>
#include <vlc_dialog.h>
#include <vlc_access.h>

#import <AVFoundation/AVFoundation.h>
#import <CoreMedia/CoreMedia.h>

/*****************************************************************************
* Local prototypes
*****************************************************************************/
static int Open(vlc_object_t *p_this);
static void Close(vlc_object_t *p_this);
static int Demux(demux_t *p_demux);
static int Control(demux_t *, int, va_list);

/*****************************************************************************
* Module descriptor
*****************************************************************************/
vlc_module_begin ()
   set_shortname(N_("AVFoundation Video Capture"))
   set_description(N_("AVFoundation video capture module."))
   set_category(CAT_INPUT)
   set_subcategory(SUBCAT_INPUT_ACCESS)
   add_shortcut("avcapture")
   set_capability("access_demux", 10)
   set_callbacks(Open, Close)
vlc_module_end ()


/*****************************************************************************
* AVFoundation Bridge
*****************************************************************************/
@interface VLCAVDecompressedVideoOutput : AVCaptureVideoDataOutput
{
    demux_t             *p_avcapture;

    CVImageBufferRef    currentImageBuffer;

    mtime_t             currentPts;
    mtime_t             previousPts;
    size_t              bytesPerRow;

    long                timeScale;
    BOOL                videoDimensionsReady;
}

@property (readwrite) CMVideoDimensions videoDimensions;

- (id)initWithDemux:(demux_t *)p_demux;
- (int)width;
- (int)height;
- (void)getVideoDimensions:(CMSampleBufferRef)sampleBuffer;
- (mtime_t)currentPts;
- (void)captureOutput:(AVCaptureOutput *)captureOutput didOutputSampleBuffer:(CMSampleBufferRef)sampleBuffer fromConnection:(AVCaptureConnection *)connection;
- (mtime_t)copyCurrentFrameToBuffer:(void *)buffer;
@end

@implementation VLCAVDecompressedVideoOutput : AVCaptureVideoDataOutput

- (id)initWithDemux:(demux_t *)p_demux
{
    if (self = [super init])
    {
        p_avcapture = p_demux;
        currentImageBuffer = nil;
        currentPts = 0;
        previousPts = 0;
        bytesPerRow = 0;
        timeScale = 0;
        videoDimensionsReady = NO;
    }
    return self;
}

- (void)dealloc
{
    @synchronized (self)
    {
        CVBufferRelease(currentImageBuffer);
        currentImageBuffer = nil;
        bytesPerRow = 0;
        videoDimensionsReady = NO;
    }
    [super dealloc];
}

- (long)timeScale
{
    return timeScale;
}

- (int)width
{
    return self.videoDimensions.width;
}

- (int)height
{
    return self.videoDimensions.height;
}

- (size_t)bytesPerRow
{
    return bytesPerRow;
}

- (void)getVideoDimensions:(CMSampleBufferRef)sampleBuffer
{
    if (!videoDimensionsReady)
    {
        CMFormatDescriptionRef formatDescription = CMSampleBufferGetFormatDescription(sampleBuffer);
        self.videoDimensions = CMVideoFormatDescriptionGetDimensions(formatDescription);
        bytesPerRow = CVPixelBufferGetBytesPerRow(CMSampleBufferGetImageBuffer(sampleBuffer));
        videoDimensionsReady = YES;
        msg_Dbg(p_avcapture, "Dimensionns obtained height:%i width:%i bytesPerRow:%lu", [self height], [self width], bytesPerRow);
    }
}

-(mtime_t)currentPts
{
    mtime_t pts;

    if ( !currentImageBuffer || currentPts == previousPts )
        return 0;

    @synchronized (self)
    {
        pts = previousPts = currentPts;
    }

    return currentPts;
}

169 170 171
- (void)captureOutput:(AVCaptureOutput *)captureOutput
didOutputSampleBuffer:(CMSampleBufferRef)sampleBuffer
       fromConnection:(AVCaptureConnection *)connection
172
{
173 174 175 176 177 178 179 180 181 182 183 184 185 186 187
    @autoreleasepool {
        CVImageBufferRef imageBufferToRelease;
        CMTime presentationtimestamp = CMSampleBufferGetPresentationTimeStamp(sampleBuffer);
        CVImageBufferRef videoFrame = CMSampleBufferGetImageBuffer(sampleBuffer);
        CVBufferRetain(videoFrame);
        [self getVideoDimensions:sampleBuffer];

        @synchronized (self) {
            imageBufferToRelease = currentImageBuffer;
            currentImageBuffer = videoFrame;
            currentPts = (mtime_t)presentationtimestamp.value;
            timeScale = (long)presentationtimestamp.timescale;
        }
        
        CVBufferRelease(imageBufferToRelease);
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
    }
}

- (mtime_t)copyCurrentFrameToBuffer:(void *)buffer
{
    CVImageBufferRef imageBuffer;
    mtime_t pts;

    void *pixels;

    if ( !currentImageBuffer || currentPts == previousPts )
        return 0;

    @synchronized (self)
    {
        imageBuffer = CVBufferRetain(currentImageBuffer);
        if (imageBuffer)
        {
            pts = previousPts = currentPts;
            CVPixelBufferLockBaseAddress(imageBuffer, 0);
            pixels = CVPixelBufferGetBaseAddress(imageBuffer);
            if (pixels)
            {
                memcpy(buffer, pixels, CVPixelBufferGetHeight(imageBuffer) * CVPixelBufferGetBytesPerRow(imageBuffer));
            }
            CVPixelBufferUnlockBaseAddress(imageBuffer, 0);
        }
    }
    CVBufferRelease(imageBuffer);

    if (pixels)
        return currentPts;
    else
        return 0;
}

@end

/*****************************************************************************
* Struct
*****************************************************************************/

struct demux_sys_t
{
    AVCaptureSession                *session;
    AVCaptureDevice                 *device;
    VLCAVDecompressedVideoOutput    *output;
    es_out_id_t                     *p_es_video;
    es_format_t                     fmt;
    int                             height, width;
    BOOL                            b_es_setup;
};

/*****************************************************************************
* Open:
*****************************************************************************/
static int Open(vlc_object_t *p_this)
{
    demux_t                 *p_demux = (demux_t*)p_this;
    demux_sys_t             *p_sys = NULL;

    NSString                *avf_currdevice_uid;
    NSArray                 *myVideoDevices;
    NSError                 *o_returnedError;

    AVCaptureDeviceInput    *input = nil;

    int                     i, i_width, i_height, deviceCount, ivideo;

    char                    *psz_uid = NULL;

    /* Only when selected */
    if ( *p_demux->psz_access == '\0' )
        return VLC_EGENERIC;

263 264 265
    @autoreleasepool {
        if (p_demux->psz_location && *p_demux->psz_location)
            psz_uid = strdup(p_demux->psz_location);
266

267 268
        msg_Dbg(p_demux, "avcapture uid = %s", psz_uid);
        avf_currdevice_uid = [[NSString alloc] initWithFormat:@"%s", psz_uid];
269

270 271 272 273 274 275
        /* Set up p_demux */
        p_demux->pf_demux = Demux;
        p_demux->pf_control = Control;
        p_demux->info.i_update = 0;
        p_demux->info.i_title = 0;
        p_demux->info.i_seekpoint = 0;
276

277 278 279
        p_demux->p_sys = p_sys = calloc(1, sizeof(demux_sys_t));
        if ( !p_sys )
            return VLC_ENOMEM;
280

281 282 283 284
        myVideoDevices = [[[AVCaptureDevice devicesWithMediaType:AVMediaTypeVideo]
                           arrayByAddingObjectsFromArray:[AVCaptureDevice devicesWithMediaType:AVMediaTypeMuxed]] retain];
        if ( [myVideoDevices count] == 0 )
        {
285
            dialog_Fatal(p_demux, _("No video devices found"),
286 287 288 289
                             _("Your Mac does not seem to be equipped with a suitable video input device. "
                               "Please check your connectors and drivers."));
            msg_Err(p_demux, "Can't find any suitable video device");
            goto error;
290 291
        }

292 293 294 295 296 297 298 299 300 301
        deviceCount = [myVideoDevices count];
        for ( ivideo = 0; ivideo < deviceCount; ivideo++ )
        {
            AVCaptureDevice *avf_device;
            avf_device = [myVideoDevices objectAtIndex:ivideo];
            msg_Dbg(p_demux, "avcapture %i/%i %s %s", ivideo, deviceCount, [[avf_device modelID] UTF8String], [[avf_device uniqueID] UTF8String]);
            if ([[[avf_device uniqueID]stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceCharacterSet]] isEqualToString:avf_currdevice_uid]) {
                break;
            }
        }
302

303 304 305 306 307 308 309 310 311 312 313
        if ( ivideo < [myVideoDevices count] )
        {
            p_sys->device = [myVideoDevices objectAtIndex:ivideo];
        }
        else
        {
            msg_Dbg(p_demux, "Cannot find designated device as %s, falling back to default.", [avf_currdevice_uid UTF8String]);
            p_sys->device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];
        }
        if ( !p_sys->device )
        {
314
            dialog_Fatal(p_demux, _("No video devices found"),
315 316 317 318 319
                             _("Your Mac does not seem to be equipped with a suitable input device. "
                               "Please check your connectors and drivers."));
            msg_Err(p_demux, "Can't find any suitable video device");
            goto error;
        }
320

321 322 323 324 325
        if ( [p_sys->device isInUseByAnotherApplication] == YES )
        {
            msg_Err(p_demux, "default capture device is exclusively in use by another application");
            goto error;
        }
326

327
        input = [AVCaptureDeviceInput deviceInputWithDevice:p_sys->device error:&o_returnedError];
328

329 330 331 332 333
        if ( !input )
        {
            msg_Err(p_demux, "can't create a valid capture input facility (%ld)", [o_returnedError code]);
            goto error;
        }
334

335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365
        int chroma = VLC_CODEC_RGB32;

        memset(&p_sys->fmt, 0, sizeof(es_format_t));
        es_format_Init(&p_sys->fmt, VIDEO_ES, chroma);

        p_sys->session = [[AVCaptureSession alloc] init];
        [p_sys->session addInput:input];

        p_sys->output = [[VLCAVDecompressedVideoOutput alloc] initWithDemux:p_demux];
        [p_sys->session addOutput:p_sys->output];

        dispatch_queue_t queue = dispatch_queue_create("avCaptureQueue", NULL);
        [p_sys->output setSampleBufferDelegate:(id)p_sys->output queue:queue];
        dispatch_release(queue);

        p_sys->output.videoSettings = [NSDictionary dictionaryWithObject:[NSNumber numberWithInt:kCVPixelFormatType_32BGRA] forKey:(id)kCVPixelBufferPixelFormatTypeKey];
        [p_sys->session startRunning];
        
        [input release];
        
        msg_Dbg(p_demux, "AVCapture: Video device ready!");
        
        return VLC_SUCCESS;
    error:
        msg_Err(p_demux, "Error");
        [input release];
        
        free(p_sys);
        
        return VLC_EGENERIC;
    }
366 367 368 369 370 371 372 373 374 375
}

/*****************************************************************************
* Close:
*****************************************************************************/
static void Close(vlc_object_t *p_this)
{
    demux_t             *p_demux = (demux_t*)p_this;
    demux_sys_t         *p_sys = p_demux->p_sys;

376 377
    @autoreleasepool {
        msg_Dbg(p_demux,"Close AVCapture");
378

379 380 381 382 383 384 385 386
        // Perform this on main thread, as the framework itself will sometimes try to synchronously
        // work on main thread. And this will create a dead lock.
        [p_sys->session performSelectorOnMainThread:@selector(stopRunning) withObject:nil waitUntilDone:NO];
        [p_sys->output performSelectorOnMainThread:@selector(release) withObject:nil waitUntilDone:NO];
        [p_sys->session performSelectorOnMainThread:@selector(release) withObject:nil waitUntilDone:NO];
        
        free(p_sys);
    }
387 388 389 390 391 392 393 394 395 396
}

/*****************************************************************************
* Demux:
*****************************************************************************/
static int Demux(demux_t *p_demux)
{
    demux_sys_t *p_sys = p_demux->p_sys;
    block_t     *p_block;

397 398
    @autoreleasepool {
        @synchronized ( p_sys->output )
399
        {
400
            p_block = block_Alloc([p_sys->output width] * [p_sys->output bytesPerRow]);
401

402 403 404 405 406
            if ( !p_block )
            {
                msg_Err(p_demux, "cannot get block");
                return 0;
            }
407

408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426
            p_block->i_pts = [p_sys->output copyCurrentFrameToBuffer: p_block->p_buffer];

            if ( !p_block->i_pts )
            {
                /* Nothing to display yet, just forget */
                block_Release(p_block);
                msleep(10000);
                return 1;
            }
            else if ( !p_sys->b_es_setup )
            {
                p_sys->fmt.video.i_frame_rate_base = [p_sys->output timeScale];
                msg_Dbg(p_demux, "using frame rate base: %i", p_sys->fmt.video.i_frame_rate_base);
                p_sys->width = p_sys->fmt.video.i_width = [p_sys->output width];
                p_sys->height = p_sys->fmt.video.i_height = [p_sys->output height];
                p_sys->p_es_video = es_out_Add(p_demux->out, &p_sys->fmt);
                msg_Dbg(p_demux, "added new video es %4.4s %dx%d", (char*)&p_sys->fmt.i_codec, p_sys->width, p_sys->height);
                p_sys->b_es_setup = YES;
            }
427
        }
428 429 430 431
        
        es_out_Control(p_demux->out, ES_OUT_SET_PCR, p_block->i_pts);
        es_out_Send(p_demux->out, p_sys->p_es_video, p_block);
        
432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469
    }
    return 1;
}

/*****************************************************************************
* Control:
*****************************************************************************/
static int Control(demux_t *p_demux, int i_query, va_list args)
{
    bool        *pb;
    int64_t     *pi64;

    switch( i_query )
    {
        /* Special for access_demux */
        case DEMUX_CAN_PAUSE:
        case DEMUX_CAN_SEEK:
        case DEMUX_SET_PAUSE_STATE:
        case DEMUX_CAN_CONTROL_PACE:
           pb = (bool*)va_arg(args, bool *);
           *pb = false;
           return VLC_SUCCESS;

        case DEMUX_GET_PTS_DELAY:
           pi64 = (int64_t*)va_arg(args, int64_t *);
           *pi64 = INT64_C(1000) * var_InheritInteger(p_demux, "live-caching");
           return VLC_SUCCESS;

        case DEMUX_GET_TIME:
            pi64 = (int64_t*)va_arg(args, int64_t *);
            *pi64 = mdate();
            return VLC_SUCCESS;

        default:
           return VLC_EGENERIC;
    }
    return VLC_EGENERIC;
}