mirror of
https://git.videolan.org/git/ffmpeg.git
synced 2024-09-12 18:25:57 +02:00
485 lines
16 KiB
Objective-C
485 lines
16 KiB
Objective-C
/*
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* AVFoundation input device
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* Copyright (c) 2014 Thilo Borgmann <thilo.borgmann@mail.de>
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file
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* AVFoundation input device
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* @author Thilo Borgmann <thilo.borgmann@mail.de>
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*/
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#import <AVFoundation/AVFoundation.h>
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#include <pthread.h>
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#include "libavutil/pixdesc.h"
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#include "libavutil/opt.h"
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#include "libavformat/internal.h"
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#include "libavutil/internal.h"
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#include "libavutil/time.h"
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#include "avdevice.h"
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static const int avf_time_base = 100;
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static const AVRational avf_time_base_q = {
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.num = 1,
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.den = avf_time_base
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};
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struct AVFPixelFormatSpec {
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enum AVPixelFormat ff_id;
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OSType avf_id;
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};
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static const struct AVFPixelFormatSpec avf_pixel_formats[] = {
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{ AV_PIX_FMT_MONOBLACK, kCVPixelFormatType_1Monochrome },
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{ AV_PIX_FMT_RGB555BE, kCVPixelFormatType_16BE555 },
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{ AV_PIX_FMT_RGB555LE, kCVPixelFormatType_16LE555 },
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{ AV_PIX_FMT_RGB565BE, kCVPixelFormatType_16BE565 },
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{ AV_PIX_FMT_RGB565LE, kCVPixelFormatType_16LE565 },
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{ AV_PIX_FMT_RGB24, kCVPixelFormatType_24RGB },
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{ AV_PIX_FMT_BGR24, kCVPixelFormatType_24BGR },
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{ AV_PIX_FMT_0RGB, kCVPixelFormatType_32ARGB },
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{ AV_PIX_FMT_BGR0, kCVPixelFormatType_32BGRA },
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{ AV_PIX_FMT_0BGR, kCVPixelFormatType_32ABGR },
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{ AV_PIX_FMT_RGB0, kCVPixelFormatType_32RGBA },
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{ AV_PIX_FMT_BGR48BE, kCVPixelFormatType_48RGB },
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{ AV_PIX_FMT_UYVY422, kCVPixelFormatType_422YpCbCr8 },
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{ AV_PIX_FMT_YUVA444P, kCVPixelFormatType_4444YpCbCrA8R },
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{ AV_PIX_FMT_YUVA444P16LE, kCVPixelFormatType_4444AYpCbCr16 },
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{ AV_PIX_FMT_YUV444P, kCVPixelFormatType_444YpCbCr8 },
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{ AV_PIX_FMT_YUV422P16, kCVPixelFormatType_422YpCbCr16 },
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{ AV_PIX_FMT_YUV422P10, kCVPixelFormatType_422YpCbCr10 },
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{ AV_PIX_FMT_YUV444P10, kCVPixelFormatType_444YpCbCr10 },
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{ AV_PIX_FMT_YUV420P, kCVPixelFormatType_420YpCbCr8Planar },
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{ AV_PIX_FMT_NV12, kCVPixelFormatType_420YpCbCr8BiPlanarVideoRange },
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{ AV_PIX_FMT_YUYV422, kCVPixelFormatType_422YpCbCr8_yuvs },
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#if __MAC_OS_X_VERSION_MIN_REQUIRED >= 1080
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{ AV_PIX_FMT_GRAY8, kCVPixelFormatType_OneComponent8 },
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#endif
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{ AV_PIX_FMT_NONE, 0 }
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};
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typedef struct
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{
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AVClass* class;
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float frame_rate;
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int frames_captured;
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int64_t first_pts;
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pthread_mutex_t frame_lock;
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pthread_cond_t frame_wait_cond;
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id avf_delegate;
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int list_devices;
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int video_device_index;
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int video_stream_index;
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enum AVPixelFormat pixel_format;
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AVCaptureSession *capture_session;
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AVCaptureVideoDataOutput *video_output;
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CMSampleBufferRef current_frame;
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} AVFContext;
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static void lock_frames(AVFContext* ctx)
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{
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pthread_mutex_lock(&ctx->frame_lock);
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}
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static void unlock_frames(AVFContext* ctx)
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{
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pthread_mutex_unlock(&ctx->frame_lock);
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}
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/** FrameReciever class - delegate for AVCaptureSession
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*/
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@interface AVFFrameReceiver : NSObject
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{
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AVFContext* _context;
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}
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- (id)initWithContext:(AVFContext*)context;
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- (void) captureOutput:(AVCaptureOutput *)captureOutput
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didOutputSampleBuffer:(CMSampleBufferRef)videoFrame
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fromConnection:(AVCaptureConnection *)connection;
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@end
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@implementation AVFFrameReceiver
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- (id)initWithContext:(AVFContext*)context
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{
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if (self = [super init]) {
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_context = context;
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}
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return self;
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}
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- (void) captureOutput:(AVCaptureOutput *)captureOutput
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didOutputSampleBuffer:(CMSampleBufferRef)videoFrame
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fromConnection:(AVCaptureConnection *)connection
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{
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lock_frames(_context);
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if (_context->current_frame != nil) {
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CFRelease(_context->current_frame);
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}
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_context->current_frame = (CMSampleBufferRef)CFRetain(videoFrame);
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pthread_cond_signal(&_context->frame_wait_cond);
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unlock_frames(_context);
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++_context->frames_captured;
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}
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@end
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static void destroy_context(AVFContext* ctx)
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{
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[ctx->capture_session stopRunning];
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[ctx->capture_session release];
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[ctx->video_output release];
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[ctx->avf_delegate release];
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ctx->capture_session = NULL;
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ctx->video_output = NULL;
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ctx->avf_delegate = NULL;
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pthread_mutex_destroy(&ctx->frame_lock);
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pthread_cond_destroy(&ctx->frame_wait_cond);
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if (ctx->current_frame) {
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CFRelease(ctx->current_frame);
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}
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}
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static int add_video_device(AVFormatContext *s, AVCaptureDevice *video_device)
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{
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AVFContext *ctx = (AVFContext*)s->priv_data;
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NSError *error = nil;
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AVCaptureDeviceInput* capture_dev_input = [[[AVCaptureDeviceInput alloc] initWithDevice:video_device error:&error] autorelease];
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if (!capture_dev_input) {
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av_log(s, AV_LOG_ERROR, "Failed to create AV capture input device: %s\n",
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[[error localizedDescription] UTF8String]);
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return 1;
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}
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if ([ctx->capture_session canAddInput:capture_dev_input]) {
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[ctx->capture_session addInput:capture_dev_input];
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} else {
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av_log(s, AV_LOG_ERROR, "can't add video input to capture session\n");
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return 1;
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}
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// Attaching output
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ctx->video_output = [[AVCaptureVideoDataOutput alloc] init];
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if (!ctx->video_output) {
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av_log(s, AV_LOG_ERROR, "Failed to init AV video output\n");
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return 1;
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}
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// select pixel format
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struct AVFPixelFormatSpec pxl_fmt_spec;
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pxl_fmt_spec.ff_id = AV_PIX_FMT_NONE;
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for (int i = 0; avf_pixel_formats[i].ff_id != AV_PIX_FMT_NONE; i++) {
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if (ctx->pixel_format == avf_pixel_formats[i].ff_id) {
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pxl_fmt_spec = avf_pixel_formats[i];
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break;
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}
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}
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// check if selected pixel format is supported by AVFoundation
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if (pxl_fmt_spec.ff_id == AV_PIX_FMT_NONE) {
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av_log(s, AV_LOG_ERROR, "Selected pixel format (%s) is not supported by AVFoundation.\n",
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av_get_pix_fmt_name(pxl_fmt_spec.ff_id));
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return 1;
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}
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// check if the pixel format is available for this device
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if ([[ctx->video_output availableVideoCVPixelFormatTypes] indexOfObject:[NSNumber numberWithInt:pxl_fmt_spec.avf_id]] == NSNotFound) {
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av_log(s, AV_LOG_ERROR, "Selected pixel format (%s) is not supported by the input device.\n",
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av_get_pix_fmt_name(pxl_fmt_spec.ff_id));
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pxl_fmt_spec.ff_id = AV_PIX_FMT_NONE;
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av_log(s, AV_LOG_ERROR, "Supported pixel formats:\n");
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for (NSNumber *pxl_fmt in [ctx->video_output availableVideoCVPixelFormatTypes]) {
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struct AVFPixelFormatSpec pxl_fmt_dummy;
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pxl_fmt_dummy.ff_id = AV_PIX_FMT_NONE;
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for (int i = 0; avf_pixel_formats[i].ff_id != AV_PIX_FMT_NONE; i++) {
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if ([pxl_fmt intValue] == avf_pixel_formats[i].avf_id) {
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pxl_fmt_dummy = avf_pixel_formats[i];
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break;
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}
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}
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if (pxl_fmt_dummy.ff_id != AV_PIX_FMT_NONE) {
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av_log(s, AV_LOG_ERROR, " %s\n", av_get_pix_fmt_name(pxl_fmt_dummy.ff_id));
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// select first supported pixel format instead of user selected (or default) pixel format
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if (pxl_fmt_spec.ff_id == AV_PIX_FMT_NONE) {
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pxl_fmt_spec = pxl_fmt_dummy;
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}
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}
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}
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// fail if there is no appropriate pixel format or print a warning about overriding the pixel format
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if (pxl_fmt_spec.ff_id == AV_PIX_FMT_NONE) {
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return 1;
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} else {
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av_log(s, AV_LOG_WARNING, "Overriding selected pixel format to use %s instead.\n",
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av_get_pix_fmt_name(pxl_fmt_spec.ff_id));
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}
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}
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ctx->pixel_format = pxl_fmt_spec.ff_id;
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NSNumber *pixel_format = [NSNumber numberWithUnsignedInt:pxl_fmt_spec.avf_id];
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NSDictionary *capture_dict = [NSDictionary dictionaryWithObject:pixel_format
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forKey:(id)kCVPixelBufferPixelFormatTypeKey];
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[ctx->video_output setVideoSettings:capture_dict];
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[ctx->video_output setAlwaysDiscardsLateVideoFrames:YES];
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ctx->avf_delegate = [[AVFFrameReceiver alloc] initWithContext:ctx];
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dispatch_queue_t queue = dispatch_queue_create("avf_queue", NULL);
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[ctx->video_output setSampleBufferDelegate:ctx->avf_delegate queue:queue];
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dispatch_release(queue);
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if ([ctx->capture_session canAddOutput:ctx->video_output]) {
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[ctx->capture_session addOutput:ctx->video_output];
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} else {
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av_log(s, AV_LOG_ERROR, "can't add video output to capture session\n");
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return 1;
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}
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return 0;
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}
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static int get_video_config(AVFormatContext *s)
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{
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AVFContext *ctx = (AVFContext*)s->priv_data;
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// Take stream info from the first frame.
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while (ctx->frames_captured < 1) {
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CFRunLoopRunInMode(kCFRunLoopDefaultMode, 0.1, YES);
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}
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lock_frames(ctx);
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AVStream* stream = avformat_new_stream(s, NULL);
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if (!stream) {
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return 1;
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}
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ctx->video_stream_index = stream->index;
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avpriv_set_pts_info(stream, 64, 1, avf_time_base);
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CVImageBufferRef image_buffer = CMSampleBufferGetImageBuffer(ctx->current_frame);
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CGSize image_buffer_size = CVImageBufferGetEncodedSize(image_buffer);
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stream->codec->codec_id = AV_CODEC_ID_RAWVIDEO;
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stream->codec->codec_type = AVMEDIA_TYPE_VIDEO;
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stream->codec->width = (int)image_buffer_size.width;
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stream->codec->height = (int)image_buffer_size.height;
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stream->codec->pix_fmt = ctx->pixel_format;
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CFRelease(ctx->current_frame);
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ctx->current_frame = nil;
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unlock_frames(ctx);
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return 0;
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}
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static int avf_read_header(AVFormatContext *s)
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{
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NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
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AVFContext *ctx = (AVFContext*)s->priv_data;
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ctx->first_pts = av_gettime();
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pthread_mutex_init(&ctx->frame_lock, NULL);
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pthread_cond_init(&ctx->frame_wait_cond, NULL);
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// List devices if requested
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if (ctx->list_devices) {
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av_log(ctx, AV_LOG_INFO, "AVFoundation video devices:\n");
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NSArray *devices = [AVCaptureDevice devicesWithMediaType:AVMediaTypeVideo];
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for (AVCaptureDevice *device in devices) {
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const char *name = [[device localizedName] UTF8String];
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int index = [devices indexOfObject:device];
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av_log(ctx, AV_LOG_INFO, "[%d] %s\n", index, name);
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}
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goto fail;
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}
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// Find capture device
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AVCaptureDevice *video_device = nil;
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// check for device index given in filename
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if (ctx->video_device_index == -1) {
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sscanf(s->filename, "%d", &ctx->video_device_index);
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}
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if (ctx->video_device_index >= 0) {
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NSArray *devices = [AVCaptureDevice devicesWithMediaType:AVMediaTypeVideo];
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if (ctx->video_device_index >= [devices count]) {
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av_log(ctx, AV_LOG_ERROR, "Invalid device index\n");
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goto fail;
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}
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video_device = [devices objectAtIndex:ctx->video_device_index];
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} else if (strncmp(s->filename, "", 1) &&
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strncmp(s->filename, "default", 7)) {
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NSArray *devices = [AVCaptureDevice devicesWithMediaType:AVMediaTypeVideo];
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for (AVCaptureDevice *device in devices) {
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if (!strncmp(s->filename, [[device localizedName] UTF8String], strlen(s->filename))) {
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video_device = device;
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break;
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}
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}
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if (!video_device) {
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av_log(ctx, AV_LOG_ERROR, "Video device not found\n");
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goto fail;
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}
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} else {
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video_device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];
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}
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// Video capture device not found, looking for AVMediaTypeVideo
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if (!video_device) {
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video_device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];
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if (!video_device) {
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av_log(s, AV_LOG_ERROR, "No AV capture device found\n");
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goto fail;
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}
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}
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av_log(s, AV_LOG_DEBUG, "'%s' opened\n", [[video_device localizedName] UTF8String]);
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// Initialize capture session
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ctx->capture_session = [[AVCaptureSession alloc] init];
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if (add_video_device(s, video_device)) {
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goto fail;
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}
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[ctx->capture_session startRunning];
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if (get_video_config(s)) {
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goto fail;
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}
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[pool release];
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return 0;
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fail:
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[pool release];
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destroy_context(ctx);
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return AVERROR(EIO);
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}
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static int avf_read_packet(AVFormatContext *s, AVPacket *pkt)
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{
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AVFContext* ctx = (AVFContext*)s->priv_data;
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do {
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lock_frames(ctx);
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CVImageBufferRef image_buffer = CMSampleBufferGetImageBuffer(ctx->current_frame);
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if (ctx->current_frame != nil) {
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if (av_new_packet(pkt, (int)CVPixelBufferGetDataSize(image_buffer)) < 0) {
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return AVERROR(EIO);
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}
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pkt->pts = pkt->dts = av_rescale_q(av_gettime() - ctx->first_pts,
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AV_TIME_BASE_Q,
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avf_time_base_q);
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pkt->stream_index = ctx->video_stream_index;
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pkt->flags |= AV_PKT_FLAG_KEY;
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CVPixelBufferLockBaseAddress(image_buffer, 0);
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void* data = CVPixelBufferGetBaseAddress(image_buffer);
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memcpy(pkt->data, data, pkt->size);
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CVPixelBufferUnlockBaseAddress(image_buffer, 0);
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CFRelease(ctx->current_frame);
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ctx->current_frame = nil;
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} else {
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pkt->data = NULL;
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pthread_cond_wait(&ctx->frame_wait_cond, &ctx->frame_lock);
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}
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unlock_frames(ctx);
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} while (!pkt->data);
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return 0;
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}
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static int avf_close(AVFormatContext *s)
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{
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AVFContext* ctx = (AVFContext*)s->priv_data;
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destroy_context(ctx);
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return 0;
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}
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static const AVOption options[] = {
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{ "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 },
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{ "list_devices", "list available devices", offsetof(AVFContext, list_devices), AV_OPT_TYPE_INT, {.i64=0}, 0, 1, AV_OPT_FLAG_DECODING_PARAM, "list_devices" },
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{ "true", "", 0, AV_OPT_TYPE_CONST, {.i64=1}, 0, 0, AV_OPT_FLAG_DECODING_PARAM, "list_devices" },
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{ "false", "", 0, AV_OPT_TYPE_CONST, {.i64=0}, 0, 0, AV_OPT_FLAG_DECODING_PARAM, "list_devices" },
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{ "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 },
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{ "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},
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{ NULL },
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};
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static const AVClass avf_class = {
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.class_name = "AVFoundation input device",
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.item_name = av_default_item_name,
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.option = options,
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.version = LIBAVUTIL_VERSION_INT,
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.category = AV_CLASS_CATEGORY_DEVICE_VIDEO_INPUT,
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};
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|
|
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,
|
|
};
|