[deb_ffmpeg.git] / ffmpeg / libavdevice / avfoundation.m

/*
 * AVFoundation input device
 * Copyright (c) 2014 Thilo Borgmann <thilo.borgmann@mail.de>
 *
 * 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
 * AVFoundation input device
 * @author Thilo Borgmann <thilo.borgmann@mail.de>
 */

#import <AVFoundation/AVFoundation.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"

static const int avf_time_base = 100;

static const AVRational avf_time_base_q = {
    .num = 1,
    .den = avf_time_base
};

struct AVFPixelFormatSpec {
    enum AVPixelFormat ff_id;
    OSType avf_id;
};

static const struct AVFPixelFormatSpec avf_pixel_formats[] = {
    { AV_PIX_FMT_MONOBLACK,    kCVPixelFormatType_1Monochrome },
    { 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_RGB24,        kCVPixelFormatType_24RGB },
    { AV_PIX_FMT_BGR24,        kCVPixelFormatType_24BGR },
    { AV_PIX_FMT_0RGB,         kCVPixelFormatType_32ARGB },
    { AV_PIX_FMT_BGR0,         kCVPixelFormatType_32BGRA },
    { AV_PIX_FMT_0BGR,         kCVPixelFormatType_32ABGR },
    { AV_PIX_FMT_RGB0,         kCVPixelFormatType_32RGBA },
    { AV_PIX_FMT_BGR48BE,      kCVPixelFormatType_48RGB },
    { AV_PIX_FMT_UYVY422,      kCVPixelFormatType_422YpCbCr8 },
    { AV_PIX_FMT_YUVA444P,     kCVPixelFormatType_4444YpCbCrA8R },
    { AV_PIX_FMT_YUVA444P16LE, kCVPixelFormatType_4444AYpCbCr16 },
    { AV_PIX_FMT_YUV444P,      kCVPixelFormatType_444YpCbCr8 },
    { AV_PIX_FMT_YUV422P16,    kCVPixelFormatType_422YpCbCr16 },
    { AV_PIX_FMT_YUV422P10,    kCVPixelFormatType_422YpCbCr10 },
    { AV_PIX_FMT_YUV444P10,    kCVPixelFormatType_444YpCbCr10 },
    { AV_PIX_FMT_YUV420P,      kCVPixelFormatType_420YpCbCr8Planar },
    { AV_PIX_FMT_NV12,         kCVPixelFormatType_420YpCbCr8BiPlanarVideoRange },
    { 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 }
};

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              avf_delegate;

    int             list_devices;
    int             video_device_index;
    enum AVPixelFormat pixel_format;

    AVCaptureSession         *capture_session;
    AVCaptureVideoDataOutput *video_output;
    CMSampleBufferRef         current_frame;
} AVFContext;

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

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

/** FrameReciever class - delegate for AVCaptureSession
 */
@interface AVFFrameReceiver : NSObject
{
    AVFContext* _context;
}

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

- (void)  captureOutput:(AVCaptureOutput *)captureOutput
  didOutputSampleBuffer:(CMSampleBufferRef)videoFrame
         fromConnection:(AVCaptureConnection *)connection;

@end

@implementation AVFFrameReceiver

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

- (void)  captureOutput:(AVCaptureOutput *)captureOutput
  didOutputSampleBuffer:(CMSampleBufferRef)videoFrame
         fromConnection:(AVCaptureConnection *)connection
{
    lock_frames(_context);

    if (_context->current_frame != nil) {
        CFRelease(_context->current_frame);
    }

    _context->current_frame = (CMSampleBufferRef)CFRetain(videoFrame);

    pthread_cond_signal(&_context->frame_wait_cond);

    unlock_frames(_context);

    ++_context->frames_captured;
}

@end

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

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

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

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

    if (ctx->current_frame) {
        CFRelease(ctx->current_frame);
    }
}

static int avf_read_header(AVFormatContext *s)
{
    NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
    AVFContext *ctx         = (AVFContext*)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, "AVFoundation video devices:\n");
        NSArray *devices = [AVCaptureDevice devicesWithMediaType:AVMediaTypeVideo];
        for (AVCaptureDevice *device in devices) {
            const char *name = [[device localizedName] UTF8String];
            int index  = [devices indexOfObject:device];
            av_log(ctx, AV_LOG_INFO, "[%d] %s\n", index, name);
        }
        goto fail;
    }

    // Find capture device
    AVCaptureDevice *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 = [AVCaptureDevice devicesWithMediaType:AVMediaTypeVideo];

        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 = [AVCaptureDevice devicesWithMediaType:AVMediaTypeVideo];

        for (AVCaptureDevice *device in devices) {
            if (!strncmp(s->filename, [[device localizedName] 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 = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeMuxed];
    }

    // Video capture device not found, looking for AVMediaTypeVideo
    if (!video_device) {
        video_device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];

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

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

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

    NSError *error = nil;
    AVCaptureDeviceInput* capture_dev_input = [[[AVCaptureDeviceInput alloc] initWithDevice:video_device error:&error] autorelease];

    if (!capture_dev_input) {
        av_log(s, AV_LOG_ERROR, "Failed to create AV capture input device: %s\n",
               [[error localizedDescription] UTF8String]);
        goto fail;
    }

    if (!capture_dev_input) {
        av_log(s, AV_LOG_ERROR, "Failed to add AV capture input device to session: %s\n",
               [[error localizedDescription] UTF8String]);
        goto fail;
    }

    if ([ctx->capture_session canAddInput:capture_dev_input]) {
        [ctx->capture_session addInput:capture_dev_input];
    } else {
        av_log(s, AV_LOG_ERROR, "can't add video input to capture session\n");
        goto fail;
    }

    // Attaching output
    ctx->video_output = [[AVCaptureVideoDataOutput alloc] init];

    if (!ctx->video_output) {
        av_log(s, AV_LOG_ERROR, "Failed to init AV video output\n");
        goto fail;
    }

    // select pixel format
    struct AVFPixelFormatSpec pxl_fmt_spec;
    pxl_fmt_spec.ff_id = AV_PIX_FMT_NONE;

    for (int i = 0; avf_pixel_formats[i].ff_id != AV_PIX_FMT_NONE; i++) {
        if (ctx->pixel_format == avf_pixel_formats[i].ff_id) {
            pxl_fmt_spec = avf_pixel_formats[i];
            break;
        }
    }

    // check if selected pixel format is supported by AVFoundation
    if (pxl_fmt_spec.ff_id == AV_PIX_FMT_NONE) {
        av_log(s, AV_LOG_ERROR, "Selected pixel format (%s) is not supported by AVFoundation.\n",
               av_get_pix_fmt_name(pxl_fmt_spec.ff_id));
        goto fail;
    }

    // check if the pixel format is available for this device
    if ([[ctx->video_output availableVideoCVPixelFormatTypes] indexOfObject:[NSNumber numberWithInt:pxl_fmt_spec.avf_id]] == NSNotFound) {
        av_log(s, AV_LOG_ERROR, "Selected pixel format (%s) is not supported by the input device.\n",
               av_get_pix_fmt_name(pxl_fmt_spec.ff_id));

        pxl_fmt_spec.ff_id = AV_PIX_FMT_NONE;

        av_log(s, AV_LOG_ERROR, "Supported pixel formats:\n");
        for (NSNumber *pxl_fmt in [ctx->video_output availableVideoCVPixelFormatTypes]) {
            struct AVFPixelFormatSpec pxl_fmt_dummy;
            pxl_fmt_dummy.ff_id = AV_PIX_FMT_NONE;
            for (int i = 0; avf_pixel_formats[i].ff_id != AV_PIX_FMT_NONE; i++) {
                if ([pxl_fmt intValue] == avf_pixel_formats[i].avf_id) {
                    pxl_fmt_dummy = avf_pixel_formats[i];
                    break;
                }
            }

            if (pxl_fmt_dummy.ff_id != AV_PIX_FMT_NONE) {
                av_log(s, AV_LOG_ERROR, "  %s\n", av_get_pix_fmt_name(pxl_fmt_dummy.ff_id));

                // select first supported pixel format instead of user selected (or default) pixel format
                if (pxl_fmt_spec.ff_id == AV_PIX_FMT_NONE) {
                    pxl_fmt_spec = pxl_fmt_dummy;
                }
            }
        }

        // fail if there is no appropriate pixel format or print a warning about overriding the pixel format
        if (pxl_fmt_spec.ff_id == AV_PIX_FMT_NONE) {
            goto fail;
        } else {
            av_log(s, AV_LOG_WARNING, "Overriding selected pixel format to use %s instead.\n",
                   av_get_pix_fmt_name(pxl_fmt_spec.ff_id));
        }
    }


    NSNumber     *pixel_format = [NSNumber numberWithUnsignedInt:pxl_fmt_spec.avf_id];
    NSDictionary *capture_dict = [NSDictionary dictionaryWithObject:pixel_format
                                               forKey:(id)kCVPixelBufferPixelFormatTypeKey];

    [ctx->video_output setVideoSettings:capture_dict];
    [ctx->video_output setAlwaysDiscardsLateVideoFrames:YES];

    ctx->avf_delegate = [[AVFFrameReceiver alloc] initWithContext:ctx];

    dispatch_queue_t queue = dispatch_queue_create("avf_queue", NULL);
    [ctx->video_output setSampleBufferDelegate:ctx->avf_delegate queue:queue];
    dispatch_release(queue);

    if ([ctx->capture_session canAddOutput:ctx->video_output]) {
        [ctx->capture_session addOutput:ctx->video_output];
    } else {
        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, avf_time_base);

    CVImageBufferRef image_buffer = CMSampleBufferGetImageBuffer(ctx->current_frame);
    CGSize 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    = pxl_fmt_spec.ff_id;

    CFRelease(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 avf_read_packet(AVFormatContext *s, AVPacket *pkt)
{
    AVFContext* ctx = (AVFContext*)s->priv_data;

    do {
        lock_frames(ctx);

        CVImageBufferRef image_buffer = CMSampleBufferGetImageBuffer(ctx->current_frame);

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

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

            CVPixelBufferLockBaseAddress(image_buffer, 0);

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

            CVPixelBufferUnlockBaseAddress(image_buffer, 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 avf_close(AVFormatContext *s)
{
    AVFContext* ctx = (AVFContext*)s->priv_data;
    destroy_context(ctx);
    return 0;
}

static const AVOption options[] = {
    { "frame_rate", "set frame rate", offsetof(AVFContext, 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(AVFContext, 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(AVFContext, video_device_index), AV_OPT_TYPE_INT, {.i64 = -1}, -1, INT_MAX, AV_OPT_FLAG_DECODING_PARAM },
    { "pixel_format", "set pixel format", offsetof(AVFContext, pixel_format), AV_OPT_TYPE_PIXEL_FMT, {.i64 = AV_PIX_FMT_YUV420P}, 0, INT_MAX, AV_OPT_FLAG_DECODING_PARAM},
    { NULL },
};

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

AVInputFormat ff_avfoundation_demuxer = {
    .name           = "avfoundation",
    .long_name      = NULL_IF_CONFIG_SMALL("AVFoundation input device"),
    .priv_data_size = sizeof(AVFContext),
    .read_header    = avf_read_header,
    .read_packet    = avf_read_packet,
    .read_close     = avf_close,
    .flags          = AVFMT_NOFILE,
    .priv_class     = &avf_class,
};
Commit	Line	Data
2ba45a60 DM	1	/*
	2	* AVFoundation input device
	3	* Copyright (c) 2014 Thilo Borgmann <thilo.borgmann@mail.de>
	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	* AVFoundation input device
	25	* @author Thilo Borgmann <thilo.borgmann@mail.de>
	26	*/
	27
	28	#import <AVFoundation/AVFoundation.h>
	29	#include <pthread.h>
	30
	31	#include "libavutil/pixdesc.h"
	32	#include "libavutil/opt.h"
	33	#include "libavformat/internal.h"
	34	#include "libavutil/internal.h"
	35	#include "libavutil/time.h"
	36	#include "avdevice.h"
	37
	38	static const int avf_time_base = 100;
	39
	40	static const AVRational avf_time_base_q = {
	41	.num = 1,
	42	.den = avf_time_base
	43	};
	44
	45	struct AVFPixelFormatSpec {
	46	enum AVPixelFormat ff_id;
	47	OSType avf_id;
	48	};
	49
	50	static const struct AVFPixelFormatSpec avf_pixel_formats[] = {
	51	{ AV_PIX_FMT_MONOBLACK, kCVPixelFormatType_1Monochrome },
	52	{ AV_PIX_FMT_RGB555BE, kCVPixelFormatType_16BE555 },
	53	{ AV_PIX_FMT_RGB555LE, kCVPixelFormatType_16LE555 },
	54	{ AV_PIX_FMT_RGB565BE, kCVPixelFormatType_16BE565 },
	55	{ AV_PIX_FMT_RGB565LE, kCVPixelFormatType_16LE565 },
	56	{ AV_PIX_FMT_RGB24, kCVPixelFormatType_24RGB },
	57	{ AV_PIX_FMT_BGR24, kCVPixelFormatType_24BGR },
	58	{ AV_PIX_FMT_0RGB, kCVPixelFormatType_32ARGB },
	59	{ AV_PIX_FMT_BGR0, kCVPixelFormatType_32BGRA },
	60	{ AV_PIX_FMT_0BGR, kCVPixelFormatType_32ABGR },
	61	{ AV_PIX_FMT_RGB0, kCVPixelFormatType_32RGBA },
	62	{ AV_PIX_FMT_BGR48BE, kCVPixelFormatType_48RGB },
	63	{ AV_PIX_FMT_UYVY422, kCVPixelFormatType_422YpCbCr8 },
	64	{ AV_PIX_FMT_YUVA444P, kCVPixelFormatType_4444YpCbCrA8R },
65	{ AV_PIX_FMT_YUVA444P16LE, kCVPixelFormatType_4444AYpCbCr16 },
66	{ AV_PIX_FMT_YUV444P, kCVPixelFormatType_444YpCbCr8 },
67	{ AV_PIX_FMT_YUV422P16, kCVPixelFormatType_422YpCbCr16 },
68	{ AV_PIX_FMT_YUV422P10, kCVPixelFormatType_422YpCbCr10 },
69	{ AV_PIX_FMT_YUV444P10, kCVPixelFormatType_444YpCbCr10 },
70	{ AV_PIX_FMT_YUV420P, kCVPixelFormatType_420YpCbCr8Planar },
71	{ AV_PIX_FMT_NV12, kCVPixelFormatType_420YpCbCr8BiPlanarVideoRange },
72	{ AV_PIX_FMT_YUYV422, kCVPixelFormatType_422YpCbCr8_yuvs },
73	#if __MAC_OS_X_VERSION_MIN_REQUIRED >= 1080
74	{ AV_PIX_FMT_GRAY8, kCVPixelFormatType_OneComponent8 },
75	#endif
76	{ AV_PIX_FMT_NONE, 0 }
77	};
78
79	typedef struct
80	{
81	AVClass* class;
82
83	float frame_rate;
84	int frames_captured;
85	int64_t first_pts;
86	pthread_mutex_t frame_lock;
87	pthread_cond_t frame_wait_cond;
88	id avf_delegate;
89
90	int list_devices;
91	int video_device_index;
92	enum AVPixelFormat pixel_format;
93
94	AVCaptureSession *capture_session;
95	AVCaptureVideoDataOutput *video_output;
96	CMSampleBufferRef current_frame;
97	} AVFContext;
98
99	static void lock_frames(AVFContext* ctx)
100	{
101	pthread_mutex_lock(&ctx->frame_lock);
102	}
103
104	static void unlock_frames(AVFContext* ctx)
105	{
106	pthread_mutex_unlock(&ctx->frame_lock);
107	}
108
109	/** FrameReciever class - delegate for AVCaptureSession
110	*/
111	@interface AVFFrameReceiver : NSObject
112	{
113	AVFContext* _context;
114	}
115
116	- (id)initWithContext:(AVFContext*)context;
117
118	- (void) captureOutput:(AVCaptureOutput *)captureOutput
119	didOutputSampleBuffer:(CMSampleBufferRef)videoFrame
120	fromConnection:(AVCaptureConnection *)connection;
121
122	@end
123
124	@implementation AVFFrameReceiver
125
126	- (id)initWithContext:(AVFContext*)context
127	{
128	if (self = [super init]) {
129	_context = context;
130	}
131	return self;
132	}
133
134	- (void) captureOutput:(AVCaptureOutput *)captureOutput
135	didOutputSampleBuffer:(CMSampleBufferRef)videoFrame
136	fromConnection:(AVCaptureConnection *)connection
137	{
138	lock_frames(_context);
139
140	if (_context->current_frame != nil) {
141	CFRelease(_context->current_frame);
142	}
143
144	_context->current_frame = (CMSampleBufferRef)CFRetain(videoFrame);
145
146	pthread_cond_signal(&_context->frame_wait_cond);
147
148	unlock_frames(_context);
149
150	++_context->frames_captured;
151	}
152
153	@end
154
155	static void destroy_context(AVFContext* ctx)
156	{
157	[ctx->capture_session stopRunning];
158
159	[ctx->capture_session release];
160	[ctx->video_output release];
161	[ctx->avf_delegate release];
162
163	ctx->capture_session = NULL;
164	ctx->video_output = NULL;
165	ctx->avf_delegate = NULL;
166
167	pthread_mutex_destroy(&ctx->frame_lock);
168	pthread_cond_destroy(&ctx->frame_wait_cond);
169
170	if (ctx->current_frame) {
171	CFRelease(ctx->current_frame);
172	}
173	}
174
175	static int avf_read_header(AVFormatContext *s)
176	{
177	NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
178	AVFContext ctx = (AVFContext)s->priv_data;
179	ctx->first_pts = av_gettime();
180
181	pthread_mutex_init(&ctx->frame_lock, NULL);
182	pthread_cond_init(&ctx->frame_wait_cond, NULL);
183
184	// List devices if requested
185	if (ctx->list_devices) {
186	av_log(ctx, AV_LOG_INFO, "AVFoundation video devices:\n");
187	NSArray *devices = [AVCaptureDevice devicesWithMediaType:AVMediaTypeVideo];
188	for (AVCaptureDevice *device in devices) {
189	const char *name = [[device localizedName] UTF8String];
190	int index = [devices indexOfObject:device];
191	av_log(ctx, AV_LOG_INFO, "[%d] %s\n", index, name);
192	}
193	goto fail;
194	}
195
196	// Find capture device
197	AVCaptureDevice *video_device = nil;
198
199	// check for device index given in filename
200	if (ctx->video_device_index == -1) {
201	sscanf(s->filename, "%d", &ctx->video_device_index);
202	}
203
204	if (ctx->video_device_index >= 0) {
205	NSArray *devices = [AVCaptureDevice devicesWithMediaType:AVMediaTypeVideo];
206
207	if (ctx->video_device_index >= [devices count]) {
208	av_log(ctx, AV_LOG_ERROR, "Invalid device index\n");
209	goto fail;
210	}
211
212	video_device = [devices objectAtIndex:ctx->video_device_index];
213	} else if (strncmp(s->filename, "", 1) &&
214	strncmp(s->filename, "default", 7)) {
215	NSArray *devices = [AVCaptureDevice devicesWithMediaType:AVMediaTypeVideo];
216
217	for (AVCaptureDevice *device in devices) {
218	if (!strncmp(s->filename, [[device localizedName] UTF8String], strlen(s->filename))) {
219	video_device = device;
220	break;
221	}
222	}
223
224	if (!video_device) {
225	av_log(ctx, AV_LOG_ERROR, "Video device not found\n");
226	goto fail;
227	}
228	} else {
229	video_device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeMuxed];
230	}
231
232	// Video capture device not found, looking for AVMediaTypeVideo
233	if (!video_device) {
234	video_device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];
235
236	if (!video_device) {
237	av_log(s, AV_LOG_ERROR, "No AV capture device found\n");
238	goto fail;
239	}
240	}
241
242	NSString* dev_display_name = [video_device localizedName];
243	av_log(s, AV_LOG_DEBUG, "'%s' opened\n", [dev_display_name UTF8String]);
244
245	// Initialize capture session
246	ctx->capture_session = [[AVCaptureSession alloc] init];
247
248	NSError *error = nil;
249	AVCaptureDeviceInput* capture_dev_input = [[[AVCaptureDeviceInput alloc] initWithDevice:video_device error:&error] autorelease];
250
251	if (!capture_dev_input) {
252	av_log(s, AV_LOG_ERROR, "Failed to create AV capture input device: %s\n",
253	[[error localizedDescription] UTF8String]);
254	goto fail;
255	}
256
257	if (!capture_dev_input) {
258	av_log(s, AV_LOG_ERROR, "Failed to add AV capture input device to session: %s\n",
259	[[error localizedDescription] UTF8String]);
260	goto fail;
261	}
262
263	if ([ctx->capture_session canAddInput:capture_dev_input]) {
264	[ctx->capture_session addInput:capture_dev_input];
265	} else {
266	av_log(s, AV_LOG_ERROR, "can't add video input to capture session\n");
267	goto fail;
268	}
269
270	// Attaching output
271	ctx->video_output = [[AVCaptureVideoDataOutput alloc] init];
272
273	if (!ctx->video_output) {
274	av_log(s, AV_LOG_ERROR, "Failed to init AV video output\n");
275	goto fail;
276	}
277
278	// select pixel format
279	struct AVFPixelFormatSpec pxl_fmt_spec;
280	pxl_fmt_spec.ff_id = AV_PIX_FMT_NONE;
281
282	for (int i = 0; avf_pixel_formats[i].ff_id != AV_PIX_FMT_NONE; i++) {
283	if (ctx->pixel_format == avf_pixel_formats[i].ff_id) {
284	pxl_fmt_spec = avf_pixel_formats[i];
285	break;
286	}
287	}
288
289	// check if selected pixel format is supported by AVFoundation
290	if (pxl_fmt_spec.ff_id == AV_PIX_FMT_NONE) {
291	av_log(s, AV_LOG_ERROR, "Selected pixel format (%s) is not supported by AVFoundation.\n",
292	av_get_pix_fmt_name(pxl_fmt_spec.ff_id));
293	goto fail;
294	}
295
296	// check if the pixel format is available for this device
297	if ([[ctx->video_output availableVideoCVPixelFormatTypes] indexOfObject:[NSNumber numberWithInt:pxl_fmt_spec.avf_id]] == NSNotFound) {
298	av_log(s, AV_LOG_ERROR, "Selected pixel format (%s) is not supported by the input device.\n",
299	av_get_pix_fmt_name(pxl_fmt_spec.ff_id));
300
301	pxl_fmt_spec.ff_id = AV_PIX_FMT_NONE;
302
303	av_log(s, AV_LOG_ERROR, "Supported pixel formats:\n");
304	for (NSNumber *pxl_fmt in [ctx->video_output availableVideoCVPixelFormatTypes]) {
305	struct AVFPixelFormatSpec pxl_fmt_dummy;
306	pxl_fmt_dummy.ff_id = AV_PIX_FMT_NONE;
307	for (int i = 0; avf_pixel_formats[i].ff_id != AV_PIX_FMT_NONE; i++) {
308	if ([pxl_fmt intValue] == avf_pixel_formats[i].avf_id) {
309	pxl_fmt_dummy = avf_pixel_formats[i];
310	break;
311	}
312	}
313
314	if (pxl_fmt_dummy.ff_id != AV_PIX_FMT_NONE) {
315	av_log(s, AV_LOG_ERROR, " %s\n", av_get_pix_fmt_name(pxl_fmt_dummy.ff_id));
316
317	// select first supported pixel format instead of user selected (or default) pixel format
318	if (pxl_fmt_spec.ff_id == AV_PIX_FMT_NONE) {
319	pxl_fmt_spec = pxl_fmt_dummy;
320	}
321	}
322	}
323
324	// fail if there is no appropriate pixel format or print a warning about overriding the pixel format
325	if (pxl_fmt_spec.ff_id == AV_PIX_FMT_NONE) {
326	goto fail;
327	} else {
328	av_log(s, AV_LOG_WARNING, "Overriding selected pixel format to use %s instead.\n",
329	av_get_pix_fmt_name(pxl_fmt_spec.ff_id));
330	}
331	}
332
333
334	NSNumber *pixel_format = [NSNumber numberWithUnsignedInt:pxl_fmt_spec.avf_id];
335	NSDictionary *capture_dict = [NSDictionary dictionaryWithObject:pixel_format
336	forKey:(id)kCVPixelBufferPixelFormatTypeKey];
337
338	[ctx->video_output setVideoSettings:capture_dict];
339	[ctx->video_output setAlwaysDiscardsLateVideoFrames:YES];
340
341	ctx->avf_delegate = [[AVFFrameReceiver alloc] initWithContext:ctx];
342
343	dispatch_queue_t queue = dispatch_queue_create("avf_queue", NULL);
344	[ctx->video_output setSampleBufferDelegate:ctx->avf_delegate queue:queue];
345	dispatch_release(queue);
346
347	if ([ctx->capture_session canAddOutput:ctx->video_output]) {
348	[ctx->capture_session addOutput:ctx->video_output];
349	} else {
350	av_log(s, AV_LOG_ERROR, "can't add video output to capture session\n");
351	goto fail;
352	}
353
354	[ctx->capture_session startRunning];
355
356	// Take stream info from the first frame.
357	while (ctx->frames_captured < 1) {
358	CFRunLoopRunInMode(kCFRunLoopDefaultMode, 0.1, YES);
359	}
360
361	lock_frames(ctx);
362
363	AVStream* stream = avformat_new_stream(s, NULL);
364
365	if (!stream) {
366	goto fail;
367	}
368
369	avpriv_set_pts_info(stream, 64, 1, avf_time_base);
370
371	CVImageBufferRef image_buffer = CMSampleBufferGetImageBuffer(ctx->current_frame);
372	CGSize image_buffer_size = CVImageBufferGetEncodedSize(image_buffer);
373
374	stream->codec->codec_id = AV_CODEC_ID_RAWVIDEO;
375	stream->codec->codec_type = AVMEDIA_TYPE_VIDEO;
376	stream->codec->width = (int)image_buffer_size.width;
377	stream->codec->height = (int)image_buffer_size.height;
378	stream->codec->pix_fmt = pxl_fmt_spec.ff_id;
379
380	CFRelease(ctx->current_frame);
381	ctx->current_frame = nil;
382
383	unlock_frames(ctx);
384	[pool release];
385	return 0;
386
387	fail:
388	[pool release];
389	destroy_context(ctx);
390	return AVERROR(EIO);
391	}
392
393	static int avf_read_packet(AVFormatContext s, AVPacket pkt)
394	{
395	AVFContext* ctx = (AVFContext*)s->priv_data;
396
397	do {
398	lock_frames(ctx);
399
400	CVImageBufferRef image_buffer = CMSampleBufferGetImageBuffer(ctx->current_frame);
401
402	if (ctx->current_frame != nil) {
403	if (av_new_packet(pkt, (int)CVPixelBufferGetDataSize(image_buffer)) < 0) {
404	return AVERROR(EIO);
405	}
406
407	pkt->pts = pkt->dts = av_rescale_q(av_gettime() - ctx->first_pts,
408	AV_TIME_BASE_Q,
409	avf_time_base_q);
410	pkt->stream_index = 0;
411	pkt->flags \|= AV_PKT_FLAG_KEY;
412
413	CVPixelBufferLockBaseAddress(image_buffer, 0);
414
415	void* data = CVPixelBufferGetBaseAddress(image_buffer);
416	memcpy(pkt->data, data, pkt->size);
417
418	CVPixelBufferUnlockBaseAddress(image_buffer, 0);
419	CFRelease(ctx->current_frame);
420	ctx->current_frame = nil;
421	} else {
422	pkt->data = NULL;
423	pthread_cond_wait(&ctx->frame_wait_cond, &ctx->frame_lock);
424	}
425
426	unlock_frames(ctx);
427	} while (!pkt->data);
428
429	return 0;
430	}
431
432	static int avf_close(AVFormatContext *s)
433	{
434	AVFContext* ctx = (AVFContext*)s->priv_data;
435	destroy_context(ctx);
436	return 0;
437	}
438
439	static const AVOption options[] = {
440	{ "frame_rate", "set frame rate", offsetof(AVFContext, frame_rate), AV_OPT_TYPE_FLOAT, { .dbl = 30.0 }, 0.1, 30.0, AV_OPT_TYPE_VIDEO_RATE, NULL },
441	{ "list_devices", "list available devices", offsetof(AVFContext, list_devices), AV_OPT_TYPE_INT, {.i64=0}, 0, 1, AV_OPT_FLAG_DECODING_PARAM, "list_devices" },
442	{ "true", "", 0, AV_OPT_TYPE_CONST, {.i64=1}, 0, 0, AV_OPT_FLAG_DECODING_PARAM, "list_devices" },
443	{ "false", "", 0, AV_OPT_TYPE_CONST, {.i64=0}, 0, 0, AV_OPT_FLAG_DECODING_PARAM, "list_devices" },
444	{ "video_device_index", "select video device by index for devices with same name (starts at 0)", offsetof(AVFContext, video_device_index), AV_OPT_TYPE_INT, {.i64 = -1}, -1, INT_MAX, AV_OPT_FLAG_DECODING_PARAM },
445	{ "pixel_format", "set pixel format", offsetof(AVFContext, pixel_format), AV_OPT_TYPE_PIXEL_FMT, {.i64 = AV_PIX_FMT_YUV420P}, 0, INT_MAX, AV_OPT_FLAG_DECODING_PARAM},
446	{ NULL },
447	};
448
449	static const AVClass avf_class = {
450	.class_name = "AVFoundation input device",
451	.item_name = av_default_item_name,
452	.option = options,
453	.version = LIBAVUTIL_VERSION_INT,
454	.category = AV_CLASS_CATEGORY_DEVICE_VIDEO_INPUT,
455	};
456
457	AVInputFormat ff_avfoundation_demuxer = {
458	.name = "avfoundation",
459	.long_name = NULL_IF_CONFIG_SMALL("AVFoundation input device"),
460	.priv_data_size = sizeof(AVFContext),
461	.read_header = avf_read_header,
462	.read_packet = avf_read_packet,
463	.read_close = avf_close,
464	.flags = AVFMT_NOFILE,
465	.priv_class = &avf_class,
466	};