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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.  
  44. static const AVRational kQTKitTimeBase_q = {
  45.     .num = 1,
  46.     .den = QTKIT_TIMEBASE
  47. };
  48.  
  49. typedef 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.  
  68. static void lock_frames(CaptureContext* ctx)
  69. {
  70.     pthread_mutex_lock(&ctx->frame_lock);
  71. }
  72.  
  73. static 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.  
  125. static 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.  
  144. static 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.  
  284. fail:
  285.     [pool release];
  286.  
  287.     destroy_context(ctx);
  288.  
  289.     return AVERROR(EIO);
  290. }
  291.  
  292. static 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.  
  327. static int qtkit_close(AVFormatContext *s)
  328. {
  329.     CaptureContext* ctx = (CaptureContext*)s->priv_data;
  330.  
  331.     destroy_context(ctx);
  332.  
  333.     return 0;
  334. }
  335.  
  336. static 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.  
  345. static 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.  
  353. AVInputFormat 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.