[FFmpeg-devel] iSight camera support
Thilo Borgmann
thilo.borgmann at mail.de
Sat Mar 15 19:34:47 CET 2014
Hi,
Am 31.10.13 09:02, schrieb Stefano Sabatini:
> On date Tuesday 2013-10-29 22:53:11 -0400, Vadim Kalinsky encoded:
>>
tested and improved with Stefano's latest remarks, except...
>> +static int isight_read_header(AVFormatContext *s)
>> +{
>> + NSAutoreleasePool* pool = [[NSAutoreleasePool alloc] init];
>> +
>> + CaptureContext* ctx = (CaptureContext*)s->priv_data;
>> +
>> + ctx->current_frame = NULL;
>> + ctx->capture_session = NULL;
>> + ctx->qt_delegate = NULL;
>> + ctx->video_output = NULL;
>> + ctx->frames_captured = 0;
>> + ctx->first_pts = av_gettime();
>> +
>> + pthread_mutex_init(&ctx->frame_lock, NULL);
>> + pthread_cond_init(&ctx->frame_wait_cond, NULL);
>> +
>> + // Find capture device
>> + QTCaptureDevice *video_device = [QTCaptureDevice defaultInputDeviceWithMediaType:QTMediaTypeMuxed];
>
> Note: no need to specify a device name? What if several video devices
> are available?
..for this, which I cannot do now but maybe in the future.
-Thilo
-------------- next part --------------
>From 095007012146f13bd3dcd129f9668fc77e7aac51 Mon Sep 17 00:00:00 2001
From: Vadim Kalinsky <vadim at kalinsky.ru>
Date: Sat, 15 Mar 2014 19:29:55 +0100
Subject: [PATCH] lavd: Add iSight capturing device.
Signed-off-by: Thilo Borgmann <thilo.borgmann at mail.de>
---
MAINTAINERS | 1 +
common.mak | 3 +
configure | 4 +
doc/indevs.texi | 10 ++
libavdevice/Makefile | 2 +
libavdevice/alldevices.c | 1 +
libavdevice/isight.m | 306 +++++++++++++++++++++++++++++++++++++++++++++++
7 files changed, 327 insertions(+)
create mode 100644 libavdevice/isight.m
diff --git a/MAINTAINERS b/MAINTAINERS
index 6a61eba..b449cd3 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -305,6 +305,7 @@ libavdevice
dshow.c Roger Pack
fbdev_enc.c Lukasz Marek
iec61883.c Georg Lippitsch
+ isight.m Thilo Borgmann
lavfi Stefano Sabatini
libdc1394.c Roman Shaposhnik
opengl_enc.c Lukasz Marek
diff --git a/common.mak b/common.mak
index b557dff..cdad4f3 100644
--- a/common.mak
+++ b/common.mak
@@ -51,6 +51,9 @@ COMPILE_HOSTC = $(call COMPILE,HOSTCC)
%.o: %.cpp
$(COMPILE_CXX)
+%.o: %.m
+ $(COMPILE_C)
+
%.s: %.c
$(CC) $(CPPFLAGS) $(CFLAGS) -S -o $@ $<
diff --git a/configure b/configure
index 34200a3..8bb95e9 100755
--- a/configure
+++ b/configure
@@ -196,6 +196,7 @@ External library support:
--enable-frei0r enable frei0r video filtering
--enable-gnutls enable gnutls [no]
--disable-iconv disable iconv [autodetect]
+ --disable-isight disable iSight camera support [autodetect]
--enable-ladspa enable LADSPA audio filtering
--enable-libaacplus enable AAC+ encoding via libaacplus [no]
--enable-libass enable libass subtitles rendering [no]
@@ -2342,6 +2343,8 @@ dv1394_indev_deps="dv1394"
dv1394_indev_select="dv_demuxer"
fbdev_indev_deps="linux_fb_h"
fbdev_outdev_deps="linux_fb_h"
+isight_indev_extralibs="-framework QTKit -framework Foundation -framework QuartzCore"
+isight_indev_select="isight"
iec61883_indev_deps="libiec61883"
jack_indev_deps="jack_jack_h sem_timedwait"
lavfi_indev_deps="avfilter"
@@ -4533,6 +4536,7 @@ enabled decklink && { check_header DeckLinkAPI.h || die "ERROR: DeckLin
enabled fontconfig && require_pkg_config fontconfig "fontconfig/fontconfig.h" FcInit
enabled frei0r && { check_header frei0r.h || die "ERROR: frei0r.h header not found"; }
enabled gnutls && require_pkg_config gnutls gnutls/gnutls.h gnutls_global_init
+enabled isight_indev && { check_header QTKit/QTKit.h || disable isight_indev; }
enabled ladspa && { check_header ladspa.h || die "ERROR: ladspa.h header not found"; }
enabled libiec61883 && require libiec61883 libiec61883/iec61883.h iec61883_cmp_connect -lraw1394 -lavc1394 -lrom1394 -liec61883
enabled libaacplus && require "libaacplus >= 2.0.0" aacplus.h aacplusEncOpen -laacplus
diff --git a/doc/indevs.texi b/doc/indevs.texi
index 93fbbe8..d6bb8f4 100644
--- a/doc/indevs.texi
+++ b/doc/indevs.texi
@@ -252,6 +252,16 @@ ffmpeg -f iec61883 -i auto -hdvbuffer 100000 out.mpg
@end itemize
+ at section isight
+
+iSight capture input device.
+
+The filename passed as input is the capture driver number.
+
+ at example
+ffmpeg -f isight -i 0 out.mpg
+ at end example
+
@section jack
JACK input device.
diff --git a/libavdevice/Makefile b/libavdevice/Makefile
index 7d07216..e64212e 100644
--- a/libavdevice/Makefile
+++ b/libavdevice/Makefile
@@ -27,6 +27,7 @@ OBJS-$(CONFIG_FBDEV_INDEV) += fbdev_dec.o \
OBJS-$(CONFIG_FBDEV_OUTDEV) += fbdev_enc.o \
fbdev_common.o
OBJS-$(CONFIG_IEC61883_INDEV) += iec61883.o
+OBJS-$(CONFIG_ISIGHT_INDEV) += isight.o
OBJS-$(CONFIG_JACK_INDEV) += jack_audio.o timefilter.o
OBJS-$(CONFIG_LAVFI_INDEV) += lavfi.o
OBJS-$(CONFIG_OPENAL_INDEV) += openal-dec.o
@@ -47,6 +48,7 @@ OBJS-$(CONFIG_VFWCAP_INDEV) += vfwcap.o
OBJS-$(CONFIG_X11GRAB_INDEV) += x11grab.o
OBJS-$(CONFIG_XV_OUTDEV) += xv.o
+
# external libraries
OBJS-$(CONFIG_LIBCDIO_INDEV) += libcdio.o
OBJS-$(CONFIG_LIBDC1394_INDEV) += libdc1394.o
diff --git a/libavdevice/alldevices.c b/libavdevice/alldevices.c
index 005bbc8..fc412cc 100644
--- a/libavdevice/alldevices.c
+++ b/libavdevice/alldevices.c
@@ -54,6 +54,7 @@ void avdevice_register_all(void)
REGISTER_INDEV (DV1394, dv1394);
REGISTER_INOUTDEV(FBDEV, fbdev);
REGISTER_INDEV (IEC61883, iec61883);
+ REGISTER_INDEV (ISIGHT, isight);
REGISTER_INDEV (JACK, jack);
REGISTER_INDEV (LAVFI, lavfi);
REGISTER_INDEV (OPENAL, openal);
diff --git a/libavdevice/isight.m b/libavdevice/isight.m
new file mode 100644
index 0000000..65a42a0
--- /dev/null
+++ b/libavdevice/isight.m
@@ -0,0 +1,306 @@
+/*
+ * iSight capture device
+ * Copyright (c) 2013 Vadim Kalinsky <vadim at kalinsky.ru>
+ *
+ * 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
+ */
+
+#import <QTKit/QTkit.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"
+
+const int kISightTimeBase = 100;
+
+const AVRational kISightTimeBase_q = {
+ .num = 1,
+ .den = kISightTimeBase
+};
+
+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 qt_delegate;
+
+ QTCaptureSession* capture_session;
+ QTCaptureDecompressedVideoOutput* video_output;
+ CVImageBufferRef current_frame;
+} CaptureContext;
+
+
+static void lock_frames(CaptureContext* ctx)
+{
+ pthread_mutex_lock(&ctx->frame_lock);
+}
+
+static void unlock_frames(CaptureContext* ctx)
+{
+ pthread_mutex_unlock(&ctx->frame_lock);
+}
+
+
+// FrameReciever class - delegate for QTCaptureSession
+ at interface FFMPEG_FrameReceiver : NSObject
+{
+ CaptureContext* _context;
+}
+
+- (id)initWithContext:(CaptureContext*)context;
+
+- (void)captureOutput:(QTCaptureOutput *)captureOutput
+ didOutputVideoFrame:(CVImageBufferRef)videoFrame
+ withSampleBuffer:(QTSampleBuffer *)sampleBuffer
+ fromConnection:(QTCaptureConnection *)connection;
+
+ at end
+
+ at implementation FFMPEG_FrameReceiver
+
+- (id)initWithContext:(CaptureContext*)context
+{
+ if (self = [super init]) {
+ _context = context;
+ }
+ return self;
+}
+
+- (void)captureOutput:(QTCaptureOutput *)captureOutput
+ didOutputVideoFrame:(CVImageBufferRef)videoFrame
+ withSampleBuffer:(QTSampleBuffer *)sampleBuffer
+ fromConnection:(QTCaptureConnection *)connection
+{
+ lock_frames(_context);
+ if (_context->current_frame != nil) {
+ CVBufferRelease(_context->current_frame);
+ }
+
+ _context->current_frame = CVBufferRetain(videoFrame);
+
+ pthread_cond_signal(&_context->frame_wait_cond);
+
+ unlock_frames(_context);
+
+ ++_context->frames_captured;
+}
+
+ at end
+
+
+static void destroy_context(CaptureContext* ctx)
+{
+ [ctx->capture_session stopRunning];
+
+ [ctx->capture_session release];
+ [ctx->video_output release];
+ [ctx->qt_delegate release];
+
+ ctx->capture_session = NULL;
+ ctx->video_output = NULL;
+ ctx->qt_delegate = NULL;
+
+ pthread_mutex_destroy(&ctx->frame_lock);
+ pthread_cond_destroy(&ctx->frame_wait_cond);
+
+ if (ctx->current_frame)
+ CVBufferRelease(ctx->current_frame);
+}
+
+static int isight_read_header(AVFormatContext *s)
+{
+ NSAutoreleasePool* pool = [[NSAutoreleasePool alloc] init];
+
+ CaptureContext* ctx = (CaptureContext*)s->priv_data;
+
+ ctx->current_frame = NULL;
+ ctx->capture_session = NULL;
+ ctx->qt_delegate = NULL;
+ ctx->video_output = NULL;
+ ctx->frames_captured = 0;
+ ctx->first_pts = av_gettime();
+
+ pthread_mutex_init(&ctx->frame_lock, NULL);
+ pthread_cond_init(&ctx->frame_wait_cond, NULL);
+
+ // Find capture device
+ QTCaptureDevice *video_device = [QTCaptureDevice defaultInputDeviceWithMediaType:QTMediaTypeMuxed];
+
+ BOOL success = [video_device open:nil];
+
+ // Video capture device not found, looking for QTMediaTypeVideo
+ if (!success) {
+ video_device = [QTCaptureDevice defaultInputDeviceWithMediaType:QTMediaTypeVideo];
+ success = [video_device open:nil];
+ }
+
+ if (!success) {
+ av_log(s, AV_LOG_ERROR, "No QT capture device found\n");
+ goto fail;
+ }
+
+ NSString* dev_display_name = [video_device localizedDisplayName];
+ av_log (s, AV_LOG_DEBUG, "'%s' opened\n", [dev_display_name UTF8String]);
+
+ // Initialize capture session
+ ctx->capture_session = [[QTCaptureSession alloc] init];
+
+ QTCaptureDeviceInput* capture_dev_input = [[[QTCaptureDeviceInput alloc] initWithDevice:video_device] autorelease];
+ success = [ctx->capture_session addInput:capture_dev_input error:nil];
+ if (!success) {
+ av_log (s, AV_LOG_ERROR, "Failed to add QT capture device to session\n");
+ goto fail;
+ }
+
+ // Attaching output
+ ctx->video_output = [[QTCaptureDecompressedVideoOutput alloc] init];
+
+ NSDictionary *captureDictionary = [NSDictionary dictionaryWithObject:
+ [NSNumber numberWithUnsignedInt:kCVPixelFormatType_24RGB]
+ forKey:(id)kCVPixelBufferPixelFormatTypeKey];
+
+ [ctx->video_output setPixelBufferAttributes:captureDictionary];
+
+ ctx->qt_delegate = [[FFMPEG_FrameReceiver alloc] initWithContext:ctx];
+ [ctx->video_output setDelegate:ctx->qt_delegate];
+ [ctx->video_output setAutomaticallyDropsLateVideoFrames:YES];
+ [ctx->video_output setMinimumVideoFrameInterval:1.0/ctx->frame_rate];
+
+ success = [ctx->capture_session addOutput:ctx->video_output error:nil];
+
+ if (!success) {
+ 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);
+
+ size_t frame_width = CVPixelBufferGetWidth(ctx->current_frame);
+ size_t frame_height = CVPixelBufferGetHeight(ctx->current_frame);
+
+ CVBufferRelease(ctx->current_frame);
+ ctx->current_frame = nil;
+
+ unlock_frames(ctx);
+
+ AVStream* stream = avformat_new_stream(s, NULL);
+ avpriv_set_pts_info(stream, 64, 1, kISightTimeBase);
+
+ stream->codec->codec_id = AV_CODEC_ID_RAWVIDEO;
+ stream->codec->codec_type = AVMEDIA_TYPE_VIDEO;
+ stream->codec->width = (int)frame_width;
+ stream->codec->height = (int)frame_height;
+ stream->codec->pix_fmt = AV_PIX_FMT_RGB24;
+
+ s->start_time = 0;
+
+ [pool release];
+
+ return 0;
+
+fail:
+ [pool release];
+
+ destroy_context(ctx);
+
+ return AVERROR(EIO);
+}
+
+static int isight_read_packet(AVFormatContext *s, AVPacket *pkt)
+{
+ CaptureContext* ctx = (CaptureContext*)s->priv_data;
+
+ do {
+ lock_frames(ctx);
+
+ if (ctx->current_frame != nil) {
+ CVPixelBufferLockBaseAddress(ctx->current_frame, 0);
+
+ av_new_packet(pkt, (int)CVPixelBufferGetDataSize(ctx->current_frame));
+ pkt->pts = pkt->dts = av_rescale_q(av_gettime() - ctx->first_pts, AV_TIME_BASE_Q, kISightTimeBase_q);
+ pkt->stream_index = 0;
+ pkt->flags |= AV_PKT_FLAG_KEY;
+
+ void* data = CVPixelBufferGetBaseAddress(ctx->current_frame);
+ memcpy(pkt->data, data, pkt->size);
+
+ CVPixelBufferUnlockBaseAddress(ctx->current_frame, 0);
+ CVBufferRelease(ctx->current_frame);
+ ctx->current_frame = nil;
+ } else {
+ pkt->data = NULL;
+ }
+
+ if (!pkt->data) {
+ pthread_cond_wait(&ctx->frame_wait_cond, &ctx->frame_lock);
+ }
+
+ unlock_frames(ctx);
+ } while (!pkt->data);
+
+ return 0;
+}
+
+static int isight_close(AVFormatContext *s)
+{
+ CaptureContext* ctx = (CaptureContext*)s->priv_data;
+
+ destroy_context(ctx);
+
+ return 0;
+}
+
+static const AVOption options[] = {
+ { "frame_rate", "set frame rate", offsetof(CaptureContext, frame_rate), AV_OPT_TYPE_FLOAT, { .dbl = 30.0 }, 0.1, 30.0, AV_OPT_TYPE_VIDEO_RATE, NULL },
+ { NULL },
+};
+
+static const AVClass isight_class = {
+ .class_name = "iSight camera",
+ .item_name = av_default_item_name,
+ .option = options,
+ .version = LIBAVUTIL_VERSION_INT,
+};
+
+AVInputFormat ff_isight_demuxer = {
+ .name = "isight",
+ .long_name = NULL_IF_CONFIG_SMALL("MacBook/iMac embedded camera capture"),
+ .priv_data_size = sizeof(CaptureContext),
+ .read_header = isight_read_header,
+ .read_packet = isight_read_packet,
+ .read_close = isight_close,
+ .flags = AVFMT_NOFILE,
+ .priv_class = &isight_class,
+};
--
1.8.3.2
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