diff options
Diffstat (limited to 'libavdevice/qtkit.m')
-rw-r--r-- | libavdevice/qtkit.m | 358 |
1 files changed, 358 insertions, 0 deletions
diff --git a/libavdevice/qtkit.m b/libavdevice/qtkit.m new file mode 100644 index 0000000..aa8fa16 --- /dev/null +++ b/libavdevice/qtkit.m @@ -0,0 +1,358 @@ +/* + * QTKit input device + * Copyright (c) 2013 Vadim Kalinsky <vadim@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 + */ + +/** + * @file + * QTKit input device + * @author Vadim Kalinsky <vadim@kalinsky.ru> + */ + +#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" + +#define QTKIT_TIMEBASE 100 + +static const AVRational kQTKitTimeBase_q = { + .num = 1, + .den = QTKIT_TIMEBASE +}; + +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; + + int list_devices; + int video_device_index; + + 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 + */ +@interface FFMPEG_FrameReceiver : NSObject +{ + CaptureContext* _context; +} + +- (id)initWithContext:(CaptureContext*)context; + +- (void)captureOutput:(QTCaptureOutput *)captureOutput + didOutputVideoFrame:(CVImageBufferRef)videoFrame + withSampleBuffer:(QTSampleBuffer *)sampleBuffer + fromConnection:(QTCaptureConnection *)connection; + +@end + +@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; +} + +@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 qtkit_read_header(AVFormatContext *s) +{ + NSAutoreleasePool* pool = [[NSAutoreleasePool alloc] init]; + + CaptureContext* ctx = (CaptureContext*)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, "QTKit video devices:\n"); + NSArray *devices = [QTCaptureDevice inputDevicesWithMediaType:QTMediaTypeVideo]; + for (QTCaptureDevice *device in devices) { + const char *name = [[device localizedDisplayName] UTF8String]; + int index = [devices indexOfObject:device]; + av_log(ctx, AV_LOG_INFO, "[%d] %s\n", index, name); + } + goto fail; + } + + // Find capture device + QTCaptureDevice *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 = [QTCaptureDevice inputDevicesWithMediaType:QTMediaTypeVideo]; + + 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 = [QTCaptureDevice inputDevicesWithMediaType:QTMediaTypeVideo]; + + for (QTCaptureDevice *device in devices) { + if (!strncmp(s->filename, [[device localizedDisplayName] 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 = [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 + // FIXME: Allow for a user defined pixel format + 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); + + AVStream* stream = avformat_new_stream(s, NULL); + + if (!stream) { + goto fail; + } + + avpriv_set_pts_info(stream, 64, 1, QTKIT_TIMEBASE); + + stream->codec->codec_id = AV_CODEC_ID_RAWVIDEO; + stream->codec->codec_type = AVMEDIA_TYPE_VIDEO; + stream->codec->width = (int)CVPixelBufferGetWidth (ctx->current_frame); + stream->codec->height = (int)CVPixelBufferGetHeight(ctx->current_frame); + stream->codec->pix_fmt = AV_PIX_FMT_RGB24; + + CVBufferRelease(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 qtkit_read_packet(AVFormatContext *s, AVPacket *pkt) +{ + CaptureContext* ctx = (CaptureContext*)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, kQTKitTimeBase_q); + pkt->stream_index = 0; + 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); + CVBufferRelease(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 qtkit_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 }, + { "list_devices", "list available devices", offsetof(CaptureContext, 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(CaptureContext, video_device_index), AV_OPT_TYPE_INT, {.i64 = -1}, -1, INT_MAX, AV_OPT_FLAG_DECODING_PARAM }, + { NULL }, +}; + +static const AVClass qtkit_class = { + .class_name = "QTKit input device", + .item_name = av_default_item_name, + .option = options, + .version = LIBAVUTIL_VERSION_INT, + .category = AV_CLASS_CATEGORY_DEVICE_VIDEO_INPUT, +}; + +AVInputFormat ff_qtkit_demuxer = { + .name = "qtkit", + .long_name = NULL_IF_CONFIG_SMALL("QTKit input device"), + .priv_data_size = sizeof(CaptureContext), + .read_header = qtkit_read_header, + .read_packet = qtkit_read_packet, + .read_close = qtkit_close, + .flags = AVFMT_NOFILE, + .priv_class = &qtkit_class, +}; |