avfoundation: Simple capture
authorAlexandre Lision <alexandre.lision@savoirfairelinux.com>
Mon, 23 Nov 2015 22:08:50 +0000 (17:08 -0500)
committerLuca Barbato <lu_zero@gentoo.org>
Thu, 26 Nov 2015 09:55:28 +0000 (10:55 +0100)
Originally based on the capture written by
Thilo Borgmann <thilo.borgmann@mail.de>.

Signed-off-by: Luca Barbato <lu_zero@gentoo.org>
Changelog
configure
libavdevice/Makefile
libavdevice/alldevices.c
libavdevice/avfoundation_dec.m [new file with mode: 0644]
libavdevice/version.h

index daba119..d37d5d9 100644 (file)
--- a/Changelog
+++ b/Changelog
@@ -48,6 +48,7 @@ version <next>:
 - libkvazaar HEVC encoder
 - innoHeim/Rsupport Screen Capture Codec decoder
 - support encoding 16-bit RLE SGI images
+- support Apple AVFoundation video capture
 
 
 version 11:
index 4ad9a2b..16ad102 100755 (executable)
--- a/configure
+++ b/configure
@@ -1453,6 +1453,7 @@ HAVE_LIST_PUB="
 "
 
 HEADERS_LIST="
+    AVFoundation_AVFoundation_h
     alsa_asoundlib_h
     altivec_h
     arpa_inet_h
@@ -2264,6 +2265,7 @@ xwma_demuxer_select="riffdec"
 # indevs / outdevs
 alsa_indev_deps="alsa_asoundlib_h snd_pcm_htimestamp"
 alsa_outdev_deps="alsa_asoundlib_h"
+avfoundation_indev_deps="AVFoundation_AVFoundation_h"
 bktr_indev_deps_any="dev_bktr_ioctl_bt848_h machine_ioctl_bt848_h dev_video_bktr_ioctl_bt848_h dev_ic_bt8xx_h"
 dv1394_indev_deps="dv1394"
 dv1394_indev_select="dv_demuxer"
@@ -4560,6 +4562,11 @@ check_header linux/fb.h
 check_header linux/videodev2.h
 check_struct linux/videodev2.h "struct v4l2_frmivalenum" discrete
 
+check_header AVFoundation/AVFoundation.h &&
+    check_objcflags -fobjc-arc &&
+    add_extralibs -framework Foundation -framework AVFoundation -framework CoreMedia || \
+    disable AVFoundation_AVFoundation_h
+
 check_header sys/videoio.h
 
 check_func_headers "windows.h vfw.h" capCreateCaptureWindow "$vfwcap_indev_extralibs"
index dfd56be..e93d1ec 100644 (file)
@@ -9,6 +9,7 @@ OBJS    = alldevices.o                                                  \
 # input/output devices
 OBJS-$(CONFIG_ALSA_INDEV)                += alsa_dec.o alsa.o
 OBJS-$(CONFIG_ALSA_OUTDEV)               += alsa_enc.o alsa.o
+OBJS-$(CONFIG_AVFOUNDATION_INDEV)        += avfoundation_dec.o
 OBJS-$(CONFIG_BKTR_INDEV)                += bktr.o
 OBJS-$(CONFIG_DV1394_INDEV)              += dv1394.o
 OBJS-$(CONFIG_FBDEV_INDEV)               += fbdev.o
index 5dbe277..8439b5b 100644 (file)
@@ -48,6 +48,7 @@ void avdevice_register_all(void)
 
     /* devices */
     REGISTER_INOUTDEV(ALSA,             alsa);
+    REGISTER_INDEV   (AVFOUNDATION,     avfoundation);
     REGISTER_INDEV   (BKTR,             bktr);
     REGISTER_INDEV   (DV1394,           dv1394);
     REGISTER_INDEV   (FBDEV,            fbdev);
diff --git a/libavdevice/avfoundation_dec.m b/libavdevice/avfoundation_dec.m
new file mode 100644 (file)
index 0000000..f01484c
--- /dev/null
@@ -0,0 +1,686 @@
+/*
+ * AVFoundation input device
+ * Copyright (c) 2015 Luca Barbato
+ *                    Alexandre Lision
+ *
+ * This file is part of Libav.
+ *
+ * Libav 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.
+ *
+ * Libav 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 Libav; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#import <AVFoundation/AVFoundation.h>
+#include <pthread.h>
+
+#include "libavformat/avformat.h"
+#include "libavformat/internal.h"
+
+#include "libavutil/log.h"
+#include "libavutil/mathematics.h"
+#include "libavutil/opt.h"
+#include "libavutil/parseutils.h"
+#include "libavutil/pixdesc.h"
+#include "libavutil/time.h"
+
+#include "avdevice.h"
+
+struct AVPixelFormatMap {
+    enum AVPixelFormat pix_fmt;
+    OSType core_video_fmt;
+};
+
+static const struct AVPixelFormatMap pixel_format_map[] = {
+    { AV_PIX_FMT_ABGR,         kCVPixelFormatType_32ABGR                       },
+    { AV_PIX_FMT_ARGB,         kCVPixelFormatType_32ARGB                       },
+    { AV_PIX_FMT_BGR24,        kCVPixelFormatType_24BGR                        },
+    { AV_PIX_FMT_BGR48BE,      kCVPixelFormatType_48RGB                        },
+    { AV_PIX_FMT_BGRA,         kCVPixelFormatType_32BGRA                       },
+    { AV_PIX_FMT_MONOBLACK,    kCVPixelFormatType_1Monochrome                  },
+    { AV_PIX_FMT_NV12,         kCVPixelFormatType_420YpCbCr8BiPlanarVideoRange },
+    { AV_PIX_FMT_RGB24,        kCVPixelFormatType_24RGB                        },
+    { AV_PIX_FMT_RGB555BE,     kCVPixelFormatType_16BE555                      },
+    { AV_PIX_FMT_RGB555LE,     kCVPixelFormatType_16LE555                      },
+    { AV_PIX_FMT_RGB565BE,     kCVPixelFormatType_16BE565                      },
+    { AV_PIX_FMT_RGB565LE,     kCVPixelFormatType_16LE565                      },
+    { AV_PIX_FMT_RGBA,         kCVPixelFormatType_32RGBA                       },
+    { AV_PIX_FMT_UYVY422,      kCVPixelFormatType_422YpCbCr8                   },
+    { AV_PIX_FMT_YUV420P,      kCVPixelFormatType_420YpCbCr8Planar             },
+    { AV_PIX_FMT_YUV422P10,    kCVPixelFormatType_422YpCbCr10                  },
+    { AV_PIX_FMT_YUV422P16,    kCVPixelFormatType_422YpCbCr16                  },
+    { AV_PIX_FMT_YUV444P,      kCVPixelFormatType_444YpCbCr8                   },
+    { AV_PIX_FMT_YUV444P10,    kCVPixelFormatType_444YpCbCr10                  },
+    { AV_PIX_FMT_YUVA444P,     kCVPixelFormatType_4444YpCbCrA8R                },
+    { AV_PIX_FMT_YUVA444P16LE, kCVPixelFormatType_4444AYpCbCr16                },
+    { AV_PIX_FMT_YUYV422,      kCVPixelFormatType_422YpCbCr8_yuvs              },
+#if __MAC_OS_X_VERSION_MIN_REQUIRED >= 1080
+    { AV_PIX_FMT_GRAY8,        kCVPixelFormatType_OneComponent8                },
+#endif
+    { AV_PIX_FMT_NONE,                                                       0 }
+};
+
+static enum AVPixelFormat core_video_to_pix_fmt(OSType core_video_fmt)
+{
+    int i;
+    for (i = 0; pixel_format_map[i].pix_fmt != AV_PIX_FMT_NONE; i++)
+        if (core_video_fmt == pixel_format_map[i].core_video_fmt)
+            return pixel_format_map[i].pix_fmt;
+    return AV_PIX_FMT_NONE;
+}
+
+static OSType pix_fmt_to_core_video(enum AVPixelFormat pix_fmt)
+{
+    int i;
+    for (i = 0; pixel_format_map[i].pix_fmt != AV_PIX_FMT_NONE; i++)
+        if (pix_fmt == pixel_format_map[i].pix_fmt)
+            return pixel_format_map[i].core_video_fmt;
+    return 0;
+}
+
+typedef struct AVFoundationCaptureContext {
+    AVClass *class;
+    /* AVOptions */
+    int list_devices;
+    int list_formats;
+    char *pixel_format;
+    char *video_size;   /* String describing video size */
+    char *framerate;    /* String describing the framerate */
+
+    int video_stream_index;
+    int width, height;
+    AVRational internal_framerate;
+
+    int64_t first_pts;
+    int frames_captured;
+    pthread_mutex_t frame_lock;
+    pthread_cond_t frame_wait_cond;
+
+    /* ARC-compatible pointers to ObjC objects */
+    CFTypeRef session;                  /* AVCaptureSession */
+    CFTypeRef video_output;
+    CFTypeRef video_delegate;
+    CVImageBufferRef current_frame;
+} AVFoundationCaptureContext;
+
+#define AUDIO_DEVICES 1
+#define VIDEO_DEVICES 2
+#define ALL_DEVICES   AUDIO_DEVICES | VIDEO_DEVICES
+
+#define OFFSET(x) offsetof(AVFoundationCaptureContext, x)
+#define DEC AV_OPT_FLAG_DECODING_PARAM
+static const AVOption options[] = {
+    { "list_devices", "List available devices and exit",                           OFFSET(list_devices), AV_OPT_TYPE_INT,    { .i64 =             0 }, 0, INT_MAX, DEC, "list_devices" },
+    { "all",          "Show all the supported devices",                            OFFSET(list_devices), AV_OPT_TYPE_CONST,  { .i64 = ALL_DEVICES   }, 0, INT_MAX, DEC, "list_devices" },
+    { "audio",        "Show only the audio devices",                               OFFSET(list_devices), AV_OPT_TYPE_CONST,  { .i64 = AUDIO_DEVICES }, 0, INT_MAX, DEC, "list_devices" },
+    { "video",        "Show only the video devices",                               OFFSET(list_devices), AV_OPT_TYPE_CONST,  { .i64 = VIDEO_DEVICES }, 0, INT_MAX, DEC, "list_devices" },
+    { "list_formats", "List available formats and exit",                           OFFSET(list_formats), AV_OPT_TYPE_INT,    { .i64 =             0 }, 0, INT_MAX, DEC, "list_formats" },
+    { "pixel_format", "Preferred pixel format",                                    OFFSET(pixel_format), AV_OPT_TYPE_STRING, { .str = NULL          }, 0,       0, DEC },
+    { "video_size",   "A string describing frame size, such as 640x480 or hd720.", OFFSET(video_size),   AV_OPT_TYPE_STRING, { .str = NULL          }, 0,       0, DEC },
+    { "framerate",    "A string representing desired framerate",                   OFFSET(framerate),    AV_OPT_TYPE_STRING, { .str = NULL          }, 0,       0, DEC },
+    { NULL },
+};
+
+static void list_capture_devices_by_type(AVFormatContext *s, NSString *type)
+{
+    NSArray *devices = [AVCaptureDevice devicesWithMediaType:type];
+
+    av_log(s, AV_LOG_INFO, "Type: %s\n", [type UTF8String]);
+    for (AVCaptureDevice *device in devices) {
+        av_log(s, AV_LOG_INFO, "uniqueID: %s\nname: %s\nformat:\n",
+               [[device uniqueID] UTF8String],
+               [[device localizedName] UTF8String]);
+
+        for (AVCaptureDeviceFormat *format in device.formats)
+            av_log(s, AV_LOG_INFO, "\t%s\n",
+                   [[NSString stringWithFormat: @ "%@", format] UTF8String]);
+    }
+}
+
+static int avfoundation_list_capture_devices(AVFormatContext *s)
+{
+    AVFoundationCaptureContext *ctx = s->priv_data;
+
+    if (ctx->list_devices & AUDIO_DEVICES)
+        list_capture_devices_by_type(s, AVMediaTypeAudio);
+
+    if (ctx->list_devices & VIDEO_DEVICES)
+        list_capture_devices_by_type(s, AVMediaTypeVideo);
+
+    return AVERROR_EXIT;
+}
+
+static int list_formats(AVFormatContext *s)
+{
+    av_log(s, AV_LOG_VERBOSE, "Supported pixel formats (first is more efficient):\n");
+    AVCaptureVideoDataOutput *out = [[AVCaptureVideoDataOutput alloc] init];
+
+    for (NSNumber *cv_pixel_format in[out availableVideoCVPixelFormatTypes]) {
+        OSType cv_fmt              = [cv_pixel_format intValue];
+        enum AVPixelFormat pix_fmt = core_video_to_pix_fmt(cv_fmt);
+        if (pix_fmt != AV_PIX_FMT_NONE) {
+            av_log(s, AV_LOG_VERBOSE, "  %s: %d\n",
+                   av_get_pix_fmt_name(pix_fmt),
+                   cv_fmt);
+        }
+    }
+    return AVERROR_EXIT;
+}
+
+static void lock_frames(AVFoundationCaptureContext *ctx)
+{
+    pthread_mutex_lock(&ctx->frame_lock);
+}
+
+static void unlock_frames(AVFoundationCaptureContext *ctx)
+{
+    pthread_mutex_unlock(&ctx->frame_lock);
+}
+
+@interface VideoCapture : NSObject <AVCaptureVideoDataOutputSampleBufferDelegate>
+{
+    AVFoundationCaptureContext *_context;
+}
+
+- (id)initWithContext:(AVFoundationCaptureContext *)context;
+
+- (void)captureOutput:(AVCaptureOutput *)captureOutput
+    didOutputSampleBuffer:(CMSampleBufferRef)videoFrame
+    fromConnection:(AVCaptureConnection *)connection;
+
+@end
+
+@implementation VideoCapture
+
+- (id)initWithContext:(AVFoundationCaptureContext *)context
+{
+    if (self = [super init]) {
+        _context = context;
+    }
+    return self;
+}
+
+- (void)captureOutput:(AVCaptureOutput *)captureOutput
+    didOutputSampleBuffer:(CMSampleBufferRef)videoFrame
+    fromConnection:(AVCaptureConnection *)connection
+{
+    CVImageBufferRef buf;
+    lock_frames(_context);
+
+    if (_context->current_frame != nil) {
+        CFRelease(_context->current_frame);
+    }
+
+    buf = CMSampleBufferGetImageBuffer(videoFrame);
+    if (!buf)
+        return;
+
+    CFRetain(buf);
+
+    _context->current_frame = buf;
+
+    pthread_cond_signal(&_context->frame_wait_cond);
+
+    unlock_frames(_context);
+
+    ++_context->frames_captured;
+}
+
+@end
+
+/**
+ * Configure the video device.
+ */
+static bool configure_video_device(AVFormatContext *s, AVCaptureDevice *video_device)
+{
+    AVFoundationCaptureContext *ctx        = s->priv_data;
+    AVCaptureDeviceFormat *selected_format = nil;
+    AVFrameRateRange *selected_range       = nil;
+    double framerate                       = av_q2d(ctx->internal_framerate);
+    double epsilon                         = 0.00000001;
+
+    for (AVCaptureDeviceFormat *format in[video_device formats]) {
+        CMFormatDescriptionRef formatDescription;
+        CMVideoDimensions dimensions;
+
+        formatDescription = (CMFormatDescriptionRef)format.formatDescription;
+        dimensions        = CMVideoFormatDescriptionGetDimensions(formatDescription);
+
+        if ((ctx->width == 0 && ctx->height == 0) ||
+            (dimensions.width == ctx->width && dimensions.height == ctx->height)) {
+            av_log(s, AV_LOG_VERBOSE, "Trying video size %dx%d\n",
+                   dimensions.width, dimensions.height);
+            ctx->width      = dimensions.width;
+            ctx->height     = dimensions.height;
+            selected_format = format;
+            if (framerate) {
+                av_log(s, AV_LOG_VERBOSE, "Checking support for framerate %f\n",
+                       framerate);
+                for (AVFrameRateRange *range in format.videoSupportedFrameRateRanges)
+                    if (range.minFrameRate <= (framerate + epsilon) &&
+                        range.maxFrameRate >= (framerate - epsilon)) {
+                        selected_range = range;
+                        break;
+                    }
+            } else {
+                selected_range = format.videoSupportedFrameRateRanges[0];
+                framerate      = selected_range.maxFrameRate;
+                break;
+            }
+
+            if (selected_format && selected_range)
+                break;
+        }
+    }
+
+    if (!selected_format) {
+        av_log(s, AV_LOG_ERROR, "Selected video size (%dx%d) is not supported by the device\n",
+               ctx->width, ctx->height);
+        return false;
+    } else {
+        av_log(s, AV_LOG_VERBOSE, "Setting video size to %dx%d\n",
+               ctx->width, ctx->height);
+    }
+
+    if (framerate && !selected_range) {
+        av_log(s, AV_LOG_ERROR, "Selected framerate (%f) is not supported by the device\n",
+               framerate);
+        return false;
+    } else {
+        av_log(s, AV_LOG_VERBOSE, "Setting framerate to %f\n",
+               framerate);
+    }
+
+    if ([video_device lockForConfiguration : NULL] == YES) {
+        [video_device setActiveFormat : selected_format];
+        [video_device setActiveVideoMinFrameDuration : CMTimeMake(1, framerate)];
+        [video_device setActiveVideoMaxFrameDuration : CMTimeMake(1, framerate)];
+    } else {
+        av_log(s, AV_LOG_ERROR, "Could not lock device for configuration\n");
+        return false;
+    }
+    return true;
+}
+
+static void print_supported_formats(AVFormatContext *s, AVCaptureDevice *device)
+{
+    av_log(s, AV_LOG_WARNING, "Supported modes:\n");
+    for (AVCaptureDeviceFormat *format in[device formats]) {
+        CMFormatDescriptionRef formatDescription;
+        CMVideoDimensions dimensions;
+
+        formatDescription = (CMFormatDescriptionRef)format.formatDescription;
+        dimensions        = CMVideoFormatDescriptionGetDimensions(formatDescription);
+
+        for (AVFrameRateRange *range in format.videoSupportedFrameRateRanges)
+            av_log(s, AV_LOG_WARNING, "  %dx%d@[%f %f]fps\n",
+                   dimensions.width, dimensions.height,
+                   range.minFrameRate, range.maxFrameRate);
+    }
+}
+
+static int setup_stream(AVFormatContext *s, AVCaptureDevice *device)
+{
+    AVFoundationCaptureContext *ctx = s->priv_data;
+    NSError *__autoreleasing error  = nil;
+    AVCaptureDeviceInput *input;
+    AVCaptureSession *session = (__bridge AVCaptureSession *)ctx->session;
+
+    av_log(s, AV_LOG_VERBOSE, "Setting up stream for device %s\n", [[device uniqueID] UTF8String]);
+
+    if (!configure_video_device(s, device)) {
+        av_log(s, AV_LOG_ERROR, "device configuration failed\n");
+        print_supported_formats(s, device);
+        return AVERROR(EINVAL);
+    }
+
+    // add the input devices
+    input = [AVCaptureDeviceInput deviceInputWithDevice:device
+             error:&error];
+    if (!input) {
+        av_log(s, AV_LOG_ERROR, "%s\n",
+               [[error localizedDescription] UTF8String]);
+        return AVERROR_UNKNOWN;
+    }
+
+    if ([session canAddInput : input]) {
+        [session addInput : input];
+    } else {
+        av_log(s, AV_LOG_ERROR, "Cannot add video input to capture session\n");
+        return AVERROR(EINVAL);
+    }
+
+    // add the output devices
+    if ([device hasMediaType : AVMediaTypeVideo]) {
+        AVCaptureVideoDataOutput *out = [[AVCaptureVideoDataOutput alloc] init];
+        NSNumber *core_video_fmt      = nil;
+        if (!out) {
+            av_log(s, AV_LOG_ERROR, "Failed to init AV video output\n");
+            return AVERROR(EINVAL);
+        }
+
+        [out setAlwaysDiscardsLateVideoFrames : YES];
+
+        if (ctx->pixel_format) {
+            // Try to use specified pixel format
+            core_video_fmt = [NSNumber numberWithInt:pix_fmt_to_core_video(av_get_pix_fmt(ctx->pixel_format))];
+            if ([[out availableVideoCVPixelFormatTypes] indexOfObject : core_video_fmt] != NSNotFound) {
+                av_log(s, AV_LOG_VERBOSE, "Pixel format %s supported!\n", ctx->pixel_format);
+            } else {
+                core_video_fmt = nil;
+            }
+        }
+
+        if (!ctx->pixel_format || !core_video_fmt) {
+            av_log(s, AV_LOG_VERBOSE, "Pixel format not supported or not provided, overriding...\n");
+            for (NSNumber *cv_pixel_format in[out availableVideoCVPixelFormatTypes]) {
+                OSType cv_fmt              = [cv_pixel_format intValue];
+                enum AVPixelFormat pix_fmt = core_video_to_pix_fmt(cv_fmt);
+                // Use the first one in the list, it will be the most effective
+                if (pix_fmt != AV_PIX_FMT_NONE) {
+                    core_video_fmt    = cv_pixel_format;
+                    ctx->pixel_format = av_strdup(av_get_pix_fmt_name(pix_fmt));
+                    break;
+                }
+            }
+        }
+
+        // fail if there is no appropriate pixel format
+        if (!core_video_fmt) {
+            return AVERROR(EINVAL);
+        } else {
+            av_log(s, AV_LOG_VERBOSE, "Using %s.\n",
+                   ctx->pixel_format);
+        }
+
+        NSDictionary *capture_dict = [NSDictionary dictionaryWithObject:core_video_fmt
+                                      forKey:(const NSString *)kCVPixelBufferPixelFormatTypeKey];
+        [out setVideoSettings : capture_dict];
+
+        VideoCapture *delegate = [[VideoCapture alloc] initWithContext:ctx];
+
+        dispatch_queue_t queue = dispatch_queue_create("avf_queue", NULL);
+        [out setSampleBufferDelegate : delegate queue : queue];
+
+        if ([session canAddOutput : out]) {
+            [session addOutput : out];
+            ctx->video_output   = (__bridge_retained CFTypeRef)out;
+            ctx->video_delegate = (__bridge_retained CFTypeRef)delegate;
+        } else {
+            av_log(s, AV_LOG_ERROR, "can't add video output to capture session\n");
+            return AVERROR(EINVAL);
+        }
+    }
+
+    return 0;
+}
+
+static int get_video_config(AVFormatContext *s)
+{
+    AVFoundationCaptureContext *ctx = (AVFoundationCaptureContext *)s->priv_data;
+    CVImageBufferRef image_buffer;
+    CGSize image_buffer_size;
+    AVStream *stream = avformat_new_stream(s, NULL);
+
+    if (!stream) {
+        av_log(s, AV_LOG_ERROR, "Failed to create AVStream\n");
+        return AVERROR(EINVAL);
+    }
+
+    // Take stream info from the first frame.
+    while (ctx->frames_captured < 1)
+        CFRunLoopRunInMode(kCFRunLoopDefaultMode, 0.1, YES);
+
+    lock_frames(ctx);
+
+    ctx->video_stream_index = stream->index;
+
+    avpriv_set_pts_info(stream, 64, 1, 1000000);
+
+    image_buffer      = ctx->current_frame;
+    image_buffer_size = CVImageBufferGetEncodedSize(image_buffer);
+
+    stream->codec->codec_id   = AV_CODEC_ID_RAWVIDEO;
+    stream->codec->codec_type = AVMEDIA_TYPE_VIDEO;
+    stream->codec->width      = (int)image_buffer_size.width;
+    stream->codec->height     = (int)image_buffer_size.height;
+    stream->codec->pix_fmt    = av_get_pix_fmt(ctx->pixel_format);
+
+    CFRelease(ctx->current_frame);
+    ctx->current_frame = nil;
+
+    unlock_frames(ctx);
+
+    return 0;
+}
+
+static void destroy_context(AVFoundationCaptureContext *ctx)
+{
+    AVCaptureSession *session = (__bridge AVCaptureSession *)ctx->session;
+    [session stopRunning];
+
+    ctx->session = NULL;
+
+    pthread_mutex_destroy(&ctx->frame_lock);
+    pthread_cond_destroy(&ctx->frame_wait_cond);
+
+    if (ctx->current_frame) {
+        CFRelease(ctx->current_frame);
+    }
+}
+
+static int setup_default_stream(AVFormatContext *s)
+{
+    AVCaptureDevice *device;
+    for (NSString *type in @[AVMediaTypeVideo]) {
+        device = [AVCaptureDevice defaultDeviceWithMediaType:type];
+        if (device) {
+            av_log(s, AV_LOG_VERBOSE, "Using default device %s\n",
+                   [[device uniqueID] UTF8String]);
+            return setup_stream(s, device);
+        }
+    }
+    return AVERROR(EINVAL);
+}
+
+/**
+ * Try to open device given in filename
+ * Two supported formats: "device_unique_id" or "[device_unique_id]"
+ */
+static AVCaptureDevice *create_device(AVFormatContext *s)
+{
+    NSString *filename;
+    NSError *__autoreleasing error = nil;
+    NSRegularExpression *exp;
+    NSArray *matches;
+    AVCaptureDevice *device;
+
+    filename = [NSString stringWithFormat:@ "%s", s->filename];
+
+    if ((device = [AVCaptureDevice deviceWithUniqueID:filename])) {
+        av_log(s, AV_LOG_VERBOSE, "Device with name %s found\n", [filename UTF8String]);
+        return device;
+    }
+
+    // Remove '[]' from the device name
+    NSString *pat = @"(?<=\\[).*?(?=\\])";
+    exp = [NSRegularExpression regularExpressionWithPattern:pat
+           options:0
+           error:&error];
+    if (!exp) {
+        av_log(s, AV_LOG_ERROR, "%s\n",
+               [[error localizedDescription] UTF8String]);
+        return NULL;
+    }
+
+    matches = [exp matchesInString:filename options:0
+               range:NSMakeRange(0, [filename length])];
+
+    if (matches.count > 0) {
+        for (NSTextCheckingResult *match in matches) {
+            NSRange range      = [match rangeAtIndex:0];
+            NSString *uniqueID = [filename substringWithRange:NSMakeRange(range.location, range.length)];
+            av_log(s, AV_LOG_VERBOSE, "opening device with ID: %s\n", [uniqueID UTF8String]);
+            if (!(device = [AVCaptureDevice deviceWithUniqueID:uniqueID])) {
+                av_log(s, AV_LOG_ERROR, "Device with name %s not found", [filename UTF8String]);
+                return NULL;
+            }
+            return device;
+        }
+    }
+    return NULL;
+}
+
+static int setup_streams(AVFormatContext *s)
+{
+    AVFoundationCaptureContext *ctx = s->priv_data;
+    int ret;
+    AVCaptureDevice *device;
+
+    pthread_mutex_init(&ctx->frame_lock, NULL);
+    pthread_cond_init(&ctx->frame_wait_cond, NULL);
+
+    ctx->session = (__bridge_retained CFTypeRef)[[AVCaptureSession alloc] init];
+
+    if (!strncmp(s->filename, "default", 7)) {
+        ret = setup_default_stream(s);
+    } else {
+        device = create_device(s);
+        if (device) {
+            ret = setup_stream(s, device);
+        } else {
+            av_log(s, AV_LOG_ERROR, "No matches for %s\n", s->filename);
+            ret = setup_default_stream(s);
+        }
+    }
+
+    if (ret < 0) {
+        av_log(s, AV_LOG_ERROR, "No device could be added\n");
+        return ret;
+    }
+
+    av_log(s, AV_LOG_VERBOSE, "Starting session!\n");
+    [(__bridge AVCaptureSession *)ctx->session startRunning];
+
+    // Session is started, unlock device
+    [device unlockForConfiguration];
+
+    av_log(s, AV_LOG_VERBOSE, "Checking video config\n");
+    if (get_video_config(s)) {
+        destroy_context(ctx);
+        return AVERROR(EIO);
+    }
+
+    return 0;
+}
+
+static int avfoundation_read_header(AVFormatContext *s)
+{
+    AVFoundationCaptureContext *ctx = s->priv_data;
+    ctx->first_pts = av_gettime();
+
+    AVRational framerate_q = { 0, 1 };
+    ctx->internal_framerate = framerate_q;
+
+    if (ctx->list_devices)
+        return avfoundation_list_capture_devices(s);
+    if (ctx->list_formats) {
+        return list_formats(s);
+    }
+
+    if (ctx->pixel_format) {
+        if (av_get_pix_fmt(ctx->pixel_format) == AV_PIX_FMT_NONE) {
+            av_log(s, AV_LOG_ERROR, "No such input format: %s.\n",
+                   ctx->pixel_format);
+            return AVERROR(EINVAL);
+        }
+    }
+
+    if (ctx->video_size &&
+        (av_parse_video_size(&ctx->width, &ctx->height, ctx->video_size)) < 0) {
+        av_log(s, AV_LOG_ERROR, "Could not parse video size '%s'.\n",
+               ctx->video_size);
+        return AVERROR(EINVAL);
+    }
+
+    if (ctx->framerate &&
+        (av_parse_video_rate(&ctx->internal_framerate, ctx->framerate)) < 0) {
+        av_log(s, AV_LOG_ERROR, "Could not parse framerate '%s'.\n",
+               ctx->framerate);
+        return AVERROR(EINVAL);
+    }
+
+    return setup_streams(s);
+}
+
+static int avfoundation_read_packet(AVFormatContext *s, AVPacket *pkt)
+{
+    AVFoundationCaptureContext *ctx = (AVFoundationCaptureContext *)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,
+                                               (AVRational) {1, 1000000 });
+            pkt->stream_index = ctx->video_stream_index;
+            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);
+            CFRelease(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 avfoundation_read_close(AVFormatContext *s)
+{
+    av_log(s, AV_LOG_VERBOSE, "Closing session...\n");
+    AVFoundationCaptureContext *ctx = s->priv_data;
+    destroy_context(ctx);
+    return 0;
+}
+
+static const AVClass avfoundation_class = {
+    .class_name = "AVFoundation AVCaptureDevice indev",
+    .item_name  = av_default_item_name,
+    .option     = options,
+    .version    = LIBAVUTIL_VERSION_INT,
+};
+
+AVInputFormat ff_avfoundation_demuxer = {
+    .name           = "avfoundation",
+    .long_name      = NULL_IF_CONFIG_SMALL("AVFoundation AVCaptureDevice grab"),
+    .priv_data_size = sizeof(AVFoundationCaptureContext),
+    .read_header    = avfoundation_read_header,
+    .read_packet    = avfoundation_read_packet,
+    .read_close     = avfoundation_read_close,
+    .flags          = AVFMT_NOFILE,
+    .priv_class     = &avfoundation_class,
+};
index 0e047f7..a529732 100644 (file)
@@ -28,7 +28,7 @@
 #include "libavutil/version.h"
 
 #define LIBAVDEVICE_VERSION_MAJOR 56
-#define LIBAVDEVICE_VERSION_MINOR  0
+#define LIBAVDEVICE_VERSION_MINOR  1
 #define LIBAVDEVICE_VERSION_MICRO  0
 
 #define LIBAVDEVICE_VERSION_INT AV_VERSION_INT(LIBAVDEVICE_VERSION_MAJOR, \