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/*

 * QTKit input device

 * Copyright (c) 2013 Vadim Kalinsky 

 *

 * 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 

 */

#if defined(__clang__)

#pragma clang diagnostic ignored "-Wdeprecated-declarations"

#endif

#import 

#include 

#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,

};