avdevice: add decklink input support

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

8 files changed, 678 insertions, 3 deletions

diff --git a/MAINTAINERS b/MAINTAINERS
index 062ff39088..545b71e8f0 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -309,6 +309,7 @@ libavdevice
 
 
   avfoundation.m                        Thilo Borgmann
+  decklink*                             Deti Fliegl
   dshow.c                               Roger Pack (CC rogerdpack@gmail.com)
   fbdev_enc.c                           Lukasz Marek
   gdigrab.c                             Roger Pack (CC rogerdpack@gmail.com)
diff --git a/configure b/configure
index b9707c5638..9b294f861b 100755
--- a/configure
+++ b/configure
@@ -256,7 +256,7 @@ External library support:
   --enable-libzmq          enable message passing via libzmq [no]
   --enable-libzvbi         enable teletext support via libzvbi [no]
   --disable-lzma           disable lzma [autodetect]
-  --enable-decklink        enable Blackmagick DeckLink output [no]
+  --enable-decklink        enable Blackmagick DeckLink I/O support [no]
   --enable-openal          enable OpenAL 1.1 capture support [no]
   --enable-opencl          enable OpenCL code
   --enable-opengl          enable OpenGL rendering [no]
@@ -2455,6 +2455,8 @@ bktr_indev_deps_any="dev_bktr_ioctl_bt848_h machine_ioctl_bt848_h dev_video_bktr
 caca_outdev_deps="libcaca"
 decklink_outdev_deps="decklink pthreads"
 decklink_outdev_extralibs="-lstdc++"
+decklink_indev_deps="decklink pthreads"
+decklink_indev_extralibs="-lstdc++"
 dshow_indev_deps="IBaseFilter"
 dshow_indev_extralibs="-lpsapi -lole32 -lstrmiids -luuid"
 dv1394_indev_deps="dv1394"
diff --git a/doc/indevs.texi b/doc/indevs.texi
index ce409b93fb..99e1112f1f 100644
--- a/doc/indevs.texi
+++ b/doc/indevs.texi
@@ -922,4 +922,58 @@ Use the MIT-SHM extension for shared memory. Default value is @code{1}.
 It may be necessary to disable it for remote displays.
 @end table
 
+@section decklink
+
+The decklink input device provides capture capabilities for Blackmagic
+DeckLink devices.
+
+To enable this input device, you need the Blackmagic DeckLink SDK and you
+need to configure with the appropriate @code{--extra-cflags}
+and @code{--extra-ldflags}.
+On Windows, you need to run the IDL files through @command{widl}.
+
+DeckLink is very picky about the formats it supports. Pixel format is always
+uyvy422, framerate and video size must be determined for your device with
+@command{-list_formats 1}. Audio sample rate is always 48 kHz and the number
+of channels currently is limited to 2 (stereo).
+
+@subsection Options
+
+@table @option
+
+@item list_devices
+If set to @option{true}, print a list of devices and exit.
+Defaults to @option{false}.
+
+@item list_formats
+If set to @option{true}, print a list of supported formats and exit.
+Defaults to @option{false}.
+
+@end table
+
+@subsection Examples
+
+@itemize
+
+@item
+List input devices:
+@example
+ffmpeg -f decklink -list_devices 1 -i dummy
+@end example
+
+@item
+List supported formats:
+@example
+ffmpeg -f decklink -list_formats 1 -i 'Intensity Pro'
+@end example
+
+@item
+Capture video clip at 1080i50 (format 11):
+@example
+ffmpeg -f decklink -i 'Intensity Pro@@11' -acodec copy -vcodec copy output.avi
+@end example
+
+@end itemize
+
+
 @c man end INPUT DEVICES
diff --git a/libavdevice/Makefile b/libavdevice/Makefile
index f90c0f73c7..8cf98f0bce 100644
--- a/libavdevice/Makefile
+++ b/libavdevice/Makefile
@@ -17,6 +17,7 @@ OBJS-$(CONFIG_AVFOUNDATION_INDEV)        += avfoundation.o
 OBJS-$(CONFIG_BKTR_INDEV)                += bktr.o
 OBJS-$(CONFIG_CACA_OUTDEV)               += caca.o
 OBJS-$(CONFIG_DECKLINK_OUTDEV)           += decklink_enc.o decklink_enc_c.o decklink_common.o
+OBJS-$(CONFIG_DECKLINK_INDEV)            += decklink_dec.o decklink_dec_c.o decklink_common.o
 OBJS-$(CONFIG_DSHOW_INDEV)               += dshow.o dshow_enummediatypes.o \
                                             dshow_enumpins.o dshow_filter.o \
                                             dshow_pin.o dshow_common.o
@@ -57,7 +58,7 @@ OBJS-$(HAVE_LIBC_MSVCRT)                 += file_open.o
 # Windows resource file
 SLIBOBJS-$(HAVE_GNU_WINDRES)             += avdeviceres.o
 
-SKIPHEADERS-$(CONFIG_DECKLINK)           += decklink_enc.h decklink_common.h
+SKIPHEADERS-$(CONFIG_DECKLINK)           += decklink_enc.h decklink_dec.h decklink_common.h
 SKIPHEADERS-$(CONFIG_DSHOW_INDEV)        += dshow_capture.h
 SKIPHEADERS-$(CONFIG_FBDEV_INDEV)        += fbdev_common.h
 SKIPHEADERS-$(CONFIG_FBDEV_OUTDEV)       += fbdev_common.h
diff --git a/libavdevice/alldevices.c b/libavdevice/alldevices.c
index ca34959eee..b8e7854f47 100644
--- a/libavdevice/alldevices.c
+++ b/libavdevice/alldevices.c
@@ -50,7 +50,7 @@ void avdevice_register_all(void)
     REGISTER_INDEV   (AVFOUNDATION,     avfoundation);
     REGISTER_INDEV   (BKTR,             bktr);
     REGISTER_OUTDEV  (CACA,             caca);
-    REGISTER_OUTDEV  (DECKLINK,         decklink);
+    REGISTER_INOUTDEV(DECKLINK,         decklink);
     REGISTER_INDEV   (DSHOW,            dshow);
     REGISTER_INDEV   (DV1394,           dv1394);
     REGISTER_INOUTDEV(FBDEV,            fbdev);
diff --git a/libavdevice/decklink_dec.cpp b/libavdevice/decklink_dec.cpp
new file mode 100644
index 0000000000..77a0fe588c
--- /dev/null
+++ b/libavdevice/decklink_dec.cpp
@@ -0,0 +1,531 @@
+/*
+ * Blackmagic DeckLink output
+ * Copyright (c) 2013-2014 Luca Barbato, Deti Fliegl
+ *
+ * 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
+ */
+
+#include <DeckLinkAPI.h>
+
+#include <pthread.h>
+#include <semaphore.h>
+
+extern "C" {
+#include "libavformat/avformat.h"
+#include "libavformat/internal.h"
+#include "libavutil/imgutils.h"
+}
+
+#include "decklink_common.h"
+#include "decklink_dec.h"
+
+static void avpacket_queue_init(AVFormatContext *avctx, AVPacketQueue *q)
+{
+    memset(q, 0, sizeof(AVPacketQueue));
+    pthread_mutex_init(&q->mutex, NULL);
+    pthread_cond_init(&q->cond, NULL);
+    q->avctx = avctx;
+}
+
+static void avpacket_queue_flush(AVPacketQueue *q)
+{
+    AVPacketList *pkt, *pkt1;
+
+    pthread_mutex_lock(&q->mutex);
+    for (pkt = q->first_pkt; pkt != NULL; pkt = pkt1) {
+        pkt1 = pkt->next;
+        av_free_packet(&pkt->pkt);
+        av_freep(&pkt);
+    }
+    q->last_pkt   = NULL;
+    q->first_pkt  = NULL;
+    q->nb_packets = 0;
+    q->size       = 0;
+    pthread_mutex_unlock(&q->mutex);
+}
+
+static void avpacket_queue_end(AVPacketQueue *q)
+{
+    avpacket_queue_flush(q);
+    pthread_mutex_destroy(&q->mutex);
+    pthread_cond_destroy(&q->cond);
+}
+
+static unsigned long long avpacket_queue_size(AVPacketQueue *q)
+{
+    unsigned long long size;
+    pthread_mutex_lock(&q->mutex);
+    size = q->size;
+    pthread_mutex_unlock(&q->mutex);
+    return size;
+}
+
+static int avpacket_queue_put(AVPacketQueue *q, AVPacket *pkt)
+{
+    AVPacketList *pkt1;
+
+    // Drop Packet if queue size is > 1GB
+    if (avpacket_queue_size(q) >  1024 * 1024 * 1024 ) {
+        av_log(q->avctx, AV_LOG_WARNING,  "Decklink input buffer overrun!\n");
+        return -1;
+    }
+    /* duplicate the packet */
+    if (av_dup_packet(pkt) < 0) {
+        return -1;
+    }
+
+    pkt1 = (AVPacketList *)av_malloc(sizeof(AVPacketList));
+    if (!pkt1) {
+        return -1;
+    }
+    pkt1->pkt  = *pkt;
+    pkt1->next = NULL;
+
+    pthread_mutex_lock(&q->mutex);
+
+    if (!q->last_pkt) {
+        q->first_pkt = pkt1;
+    } else {
+        q->last_pkt->next = pkt1;
+    }
+
+    q->last_pkt = pkt1;
+    q->nb_packets++;
+    q->size += pkt1->pkt.size + sizeof(*pkt1);
+
+    pthread_cond_signal(&q->cond);
+
+    pthread_mutex_unlock(&q->mutex);
+    return 0;
+}
+
+static int avpacket_queue_get(AVPacketQueue *q, AVPacket *pkt, int block)
+{
+    AVPacketList *pkt1;
+    int ret;
+
+    pthread_mutex_lock(&q->mutex);
+
+    for (;; ) {
+        pkt1 = q->first_pkt;
+        if (pkt1) {
+            q->first_pkt = pkt1->next;
+            if (!q->first_pkt) {
+                q->last_pkt = NULL;
+            }
+            q->nb_packets--;
+            q->size -= pkt1->pkt.size + sizeof(*pkt1);
+            *pkt     = pkt1->pkt;
+            av_free(pkt1);
+            ret = 1;
+            break;
+        } else if (!block) {
+            ret = 0;
+            break;
+        } else {
+            pthread_cond_wait(&q->cond, &q->mutex);
+        }
+    }
+    pthread_mutex_unlock(&q->mutex);
+    return ret;
+}
+
+class decklink_input_callback : public IDeckLinkInputCallback
+{
+public:
+        decklink_input_callback(AVFormatContext *_avctx);
+        ~decklink_input_callback();
+
+        virtual HRESULT STDMETHODCALLTYPE QueryInterface(REFIID iid, LPVOID *ppv) { return E_NOINTERFACE; }
+        virtual ULONG STDMETHODCALLTYPE AddRef(void);
+        virtual ULONG STDMETHODCALLTYPE  Release(void);
+        virtual HRESULT STDMETHODCALLTYPE VideoInputFormatChanged(BMDVideoInputFormatChangedEvents, IDeckLinkDisplayMode*, BMDDetectedVideoInputFormatFlags);
+        virtual HRESULT STDMETHODCALLTYPE VideoInputFrameArrived(IDeckLinkVideoInputFrame*, IDeckLinkAudioInputPacket*);
+
+private:
+        ULONG           m_refCount;
+        pthread_mutex_t m_mutex;
+        AVFormatContext *avctx;
+        decklink_ctx    *ctx;
+        int no_video;
+        int64_t initial_video_pts;
+        int64_t initial_audio_pts;
+};
+
+decklink_input_callback::decklink_input_callback(AVFormatContext *_avctx) : m_refCount(0)
+{
+    avctx = _avctx;
+    decklink_cctx       *cctx = (struct decklink_cctx *) avctx->priv_data;
+    ctx = (struct decklink_ctx *) cctx->ctx;
+    initial_audio_pts = initial_video_pts = AV_NOPTS_VALUE;
+    pthread_mutex_init(&m_mutex, NULL);
+}
+
+decklink_input_callback::~decklink_input_callback()
+{
+    pthread_mutex_destroy(&m_mutex);
+}
+
+ULONG decklink_input_callback::AddRef(void)
+{
+    pthread_mutex_lock(&m_mutex);
+    m_refCount++;
+    pthread_mutex_unlock(&m_mutex);
+
+    return (ULONG)m_refCount;
+}
+
+ULONG decklink_input_callback::Release(void)
+{
+    pthread_mutex_lock(&m_mutex);
+    m_refCount--;
+    pthread_mutex_unlock(&m_mutex);
+
+    if (m_refCount == 0) {
+        delete this;
+        return 0;
+    }
+
+    return (ULONG)m_refCount;
+}
+
+HRESULT decklink_input_callback::VideoInputFrameArrived(
+    IDeckLinkVideoInputFrame *videoFrame, IDeckLinkAudioInputPacket *audioFrame)
+{
+    void *frameBytes;
+    void *audioFrameBytes;
+    BMDTimeValue frameTime;
+    BMDTimeValue frameDuration;
+
+    ctx->frameCount++;
+
+    // Handle Video Frame
+    if (videoFrame) {
+        AVPacket pkt;
+        AVCodecContext *c;
+        av_init_packet(&pkt);
+        c = ctx->video_st->codec;
+        if (ctx->frameCount % 25 == 0) {
+            unsigned long long qsize = avpacket_queue_size(&ctx->queue);
+            av_log(avctx, AV_LOG_DEBUG,
+                    "Frame received (#%lu) - Valid (%liB) - QSize %fMB\n",
+                    ctx->frameCount,
+                    videoFrame->GetRowBytes() * videoFrame->GetHeight(),
+                    (double)qsize / 1024 / 1024);
+        }
+
+        videoFrame->GetBytes(&frameBytes);
+        videoFrame->GetStreamTime(&frameTime, &frameDuration,
+                                  ctx->video_st->time_base.den);
+
+        if (videoFrame->GetFlags() & bmdFrameHasNoInputSource) {
+            unsigned bars[8] = {
+                0xEA80EA80, 0xD292D210, 0xA910A9A5, 0x90229035,
+                0x6ADD6ACA, 0x51EF515A, 0x286D28EF, 0x10801080 };
+            int width  = videoFrame->GetWidth();
+            int height = videoFrame->GetHeight();
+            unsigned *p = (unsigned *)frameBytes;
+
+            for (int y = 0; y < height; y++) {
+                for (int x = 0; x < width; x += 2)
+                    *p++ = bars[(x * 8) / width];
+            }
+
+            if (!no_video) {
+                av_log(avctx, AV_LOG_WARNING, "Frame received (#%lu) - No input signal detected "
+                        "- Frames dropped %u\n", ctx->frameCount, ++ctx->dropped);
+            }
+            no_video = 1;
+        } else {
+            if (no_video) {
+                av_log(avctx, AV_LOG_WARNING, "Frame received (#%lu) - Input returned "
+                        "- Frames dropped %u\n", ctx->frameCount, ++ctx->dropped);
+            }
+            no_video = 0;
+        }
+
+        pkt.pts = frameTime / ctx->video_st->time_base.num;
+
+        if (initial_video_pts == AV_NOPTS_VALUE) {
+            initial_video_pts = pkt.pts;
+        }
+
+        pkt.pts -= initial_video_pts;
+        pkt.dts = pkt.pts;
+
+        pkt.duration = frameDuration;
+        //To be made sure it still applies
+        pkt.flags       |= AV_PKT_FLAG_KEY;
+        pkt.stream_index = ctx->video_st->index;
+        pkt.data         = (uint8_t *)frameBytes;
+        pkt.size         = videoFrame->GetRowBytes() *
+                           videoFrame->GetHeight();
+        //fprintf(stderr,"Video Frame size %d ts %d\n", pkt.size, pkt.pts);
+        c->frame_number++;
+        if (avpacket_queue_put(&ctx->queue, &pkt) < 0) {
+            ++ctx->dropped;
+        }
+    }
+
+    // Handle Audio Frame
+    if (audioFrame) {
+        AVCodecContext *c;
+        AVPacket pkt;
+        BMDTimeValue audio_pts;
+        av_init_packet(&pkt);
+
+        c = ctx->audio_st->codec;
+        //hack among hacks
+        pkt.size = audioFrame->GetSampleFrameCount() * ctx->audio_st->codec->channels * (16 / 8);
+        audioFrame->GetBytes(&audioFrameBytes);
+        audioFrame->GetPacketTime(&audio_pts, ctx->audio_st->time_base.den);
+        pkt.pts = audio_pts / ctx->audio_st->time_base.num;
+
+        if (initial_audio_pts == AV_NOPTS_VALUE) {
+            initial_audio_pts = pkt.pts;
+        }
+
+        pkt.pts -= initial_audio_pts;
+        pkt.dts = pkt.pts;
+
+        //fprintf(stderr,"Audio Frame size %d ts %d\n", pkt.size, pkt.pts);
+        pkt.flags       |= AV_PKT_FLAG_KEY;
+        pkt.stream_index = ctx->audio_st->index;
+        pkt.data         = (uint8_t *)audioFrameBytes;
+
+        c->frame_number++;
+        if (avpacket_queue_put(&ctx->queue, &pkt) < 0) {
+            ++ctx->dropped;
+        }
+    }
+
+    return S_OK;
+}
+
+HRESULT decklink_input_callback::VideoInputFormatChanged(
+    BMDVideoInputFormatChangedEvents events, IDeckLinkDisplayMode *mode,
+    BMDDetectedVideoInputFormatFlags)
+{
+    return S_OK;
+}
+
+static HRESULT decklink_start_input(AVFormatContext *avctx)
+{
+    struct decklink_cctx *cctx = (struct decklink_cctx *) avctx->priv_data;
+    struct decklink_ctx *ctx = (struct decklink_ctx *) cctx->ctx;
+
+    ctx->input_callback = new decklink_input_callback(avctx);
+    ctx->dli->SetCallback(ctx->input_callback);
+    return ctx->dli->StartStreams();
+}
+
+extern "C" {
+
+av_cold int ff_decklink_read_close(AVFormatContext *avctx)
+{
+    struct decklink_cctx *cctx = (struct decklink_cctx *) avctx->priv_data;
+    struct decklink_ctx *ctx = (struct decklink_ctx *) cctx->ctx;
+
+    if (ctx->capture_started) {
+        ctx->dli->StopStreams();
+        ctx->dli->DisableVideoInput();
+        ctx->dli->DisableAudioInput();
+    }
+
+    if (ctx->dli)
+        ctx->dli->Release();
+    if (ctx->dl)
+        ctx->dl->Release();
+
+    avpacket_queue_end(&ctx->queue);
+
+    av_freep(&cctx->ctx);
+
+    return 0;
+}
+
+av_cold int ff_decklink_read_header(AVFormatContext *avctx)
+{
+    struct decklink_cctx *cctx = (struct decklink_cctx *) avctx->priv_data;
+    struct decklink_ctx *ctx;
+    IDeckLinkDisplayModeIterator *itermode;
+    IDeckLinkIterator *iter;
+    IDeckLink *dl = NULL;
+    AVStream *st;
+    HRESULT result;
+    char fname[1024];
+    char *tmp;
+    int mode_num = 0;
+
+    ctx = (struct decklink_ctx *) av_mallocz(sizeof(struct decklink_ctx));
+    if (!ctx)
+        return AVERROR(ENOMEM);
+    ctx->list_devices = cctx->list_devices;
+    ctx->list_formats = cctx->list_formats;
+    ctx->preroll      = cctx->preroll;
+    cctx->ctx = ctx;
+
+    iter = CreateDeckLinkIteratorInstance();
+    if (!iter) {
+        av_log(avctx, AV_LOG_ERROR, "Could not create DeckLink iterator\n");
+        return AVERROR(EIO);
+    }
+
+    /* List available devices. */
+    if (ctx->list_devices) {
+        ff_decklink_list_devices(avctx);
+        return AVERROR_EXIT;
+    }
+
+    strcpy (fname, avctx->filename);
+    tmp=strchr (fname, '@');
+    if (tmp != NULL) {
+        mode_num = atoi (tmp+1);
+        *tmp = 0;
+    }
+
+    /* Open device. */
+    while (iter->Next(&dl) == S_OK) {
+        const char *displayName;
+        ff_decklink_get_display_name(dl, &displayName);
+        if (!strcmp(fname, displayName)) {
+            av_free((void *) displayName);
+            ctx->dl = dl;
+            break;
+        }
+        av_free((void *) displayName);
+        dl->Release();
+    }
+    iter->Release();
+    if (!ctx->dl) {
+        av_log(avctx, AV_LOG_ERROR, "Could not open '%s'\n", fname);
+        return AVERROR(EIO);
+    }
+
+    /* Get input device. */
+    if (ctx->dl->QueryInterface(IID_IDeckLinkInput, (void **) &ctx->dli) != S_OK) {
+        av_log(avctx, AV_LOG_ERROR, "Could not open output device from '%s'\n",
+               avctx->filename);
+        ctx->dl->Release();
+        return AVERROR(EIO);
+    }
+
+    /* List supported formats. */
+    if (ctx->list_formats) {
+        ff_decklink_list_formats(avctx, DIRECTION_IN);
+        ctx->dli->Release();
+        ctx->dl->Release();
+        return AVERROR_EXIT;
+    }
+
+    if (ctx->dli->GetDisplayModeIterator(&itermode) != S_OK) {
+        av_log(avctx, AV_LOG_ERROR, "Could not get Display Mode Iterator\n");
+        ctx->dl->Release();
+        return AVERROR(EIO);
+    }
+
+    if (mode_num > 0) {
+        if (ff_decklink_set_format(avctx, DIRECTION_IN, mode_num) < 0) {
+            av_log(avctx, AV_LOG_ERROR, "Could not set mode %d for %s\n", mode_num, fname);
+            goto error;
+        }
+    }
+
+    itermode->Release();
+
+    /* Setup streams. */
+    st = avformat_new_stream(avctx, NULL);
+    if (!st) {
+        av_log(avctx, AV_LOG_ERROR, "Cannot add stream\n");
+        goto error;
+    }
+    st->codec->codec_type  = AVMEDIA_TYPE_AUDIO;
+    st->codec->codec_id    = AV_CODEC_ID_PCM_S16LE;
+    st->codec->sample_rate = bmdAudioSampleRate48kHz;
+    st->codec->channels    = 2;
+    avpriv_set_pts_info(st, 64, 1, 1000000);  /* 64 bits pts in us */
+    ctx->audio_st=st;
+
+    st = avformat_new_stream(avctx, NULL);
+    if (!st) {
+        av_log(avctx, AV_LOG_ERROR, "Cannot add stream\n");
+        goto error;
+    }
+    st->codec->codec_type  = AVMEDIA_TYPE_VIDEO;
+    st->codec->codec_id    = AV_CODEC_ID_RAWVIDEO;
+    st->codec->width       = ctx->bmd_width;
+    st->codec->height      = ctx->bmd_height;
+
+    st->codec->pix_fmt     = AV_PIX_FMT_UYVY422;
+    st->codec->time_base.den      = ctx->bmd_tb_den;
+    st->codec->time_base.num      = ctx->bmd_tb_num;
+    st->codec->bit_rate    = avpicture_get_size(st->codec->pix_fmt, ctx->bmd_width, ctx->bmd_height) * 1/av_q2d(st->codec->time_base) * 8;
+    st->codec->codec_tag   = MKTAG('U', 'Y', 'V', 'Y');
+
+    avpriv_set_pts_info(st, 64, 1, 1000000);  /* 64 bits pts in us */
+
+    ctx->video_st=st;
+
+    result = ctx->dli->EnableAudioInput(bmdAudioSampleRate48kHz, bmdAudioSampleType16bitInteger, 2);
+
+    if (result != S_OK) {
+        av_log(avctx, AV_LOG_ERROR, "Cannot enable audio input\n");
+        goto error;
+    }
+
+    result = ctx->dli->EnableVideoInput(ctx->bmd_mode, bmdFormat8BitYUV, bmdVideoInputFlagDefault);
+
+    if (result != S_OK) {
+        av_log(avctx, AV_LOG_ERROR, "Cannot enable video input\n");
+        goto error;
+    }
+
+    avpacket_queue_init (avctx, &ctx->queue);
+
+    if (decklink_start_input (avctx) != S_OK) {
+        av_log(avctx, AV_LOG_ERROR, "Cannot start input stream\n");
+        goto error;
+    }
+
+    return 0;
+
+error:
+
+    ctx->dli->Release();
+    ctx->dl->Release();
+
+    return AVERROR(EIO);
+}
+
+int ff_decklink_read_packet(AVFormatContext *avctx, AVPacket *pkt)
+{
+    struct decklink_cctx *cctx = (struct decklink_cctx *) avctx->priv_data;
+    struct decklink_ctx *ctx = (struct decklink_ctx *) cctx->ctx;
+    AVFrame *frame = ctx->video_st->codec->coded_frame;
+
+    avpacket_queue_get(&ctx->queue, pkt, 1);
+    if (frame && (ctx->bmd_field_dominance == bmdUpperFieldFirst || ctx->bmd_field_dominance == bmdLowerFieldFirst)) {
+        frame->interlaced_frame = 1;
+        if (ctx->bmd_field_dominance == bmdUpperFieldFirst) {
+            frame->top_field_first = 1;
+        }
+    }
+
+    return 0;
+}
+
+} /* extern "C" */
diff --git a/libavdevice/decklink_dec.h b/libavdevice/decklink_dec.h
new file mode 100644
index 0000000000..6bd9226cd0
--- /dev/null
+++ b/libavdevice/decklink_dec.h
@@ -0,0 +1,32 @@
+/*
+ * Blackmagic DeckLink output
+ * Copyright (c) 2013-2014 Ramiro Polla
+ *
+ * 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
+ */
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+int ff_decklink_read_header(AVFormatContext *avctx);
+int ff_decklink_read_packet(AVFormatContext *avctx, AVPacket *pkt);
+int ff_decklink_read_close(AVFormatContext *avctx);
+
+#ifdef __cplusplus
+} /* extern "C" */
+#endif
diff --git a/libavdevice/decklink_dec_c.c b/libavdevice/decklink_dec_c.c
new file mode 100644
index 0000000000..2aea2770e2
--- /dev/null
+++ b/libavdevice/decklink_dec_c.c
@@ -0,0 +1,54 @@
+/*
+ * Blackmagic DeckLink output
+ * Copyright (c) 2014 Deti Fliegl
+ *
+ * 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
+ */
+
+#include "libavformat/avformat.h"
+#include "libavutil/opt.h"
+
+#include "decklink_common_c.h"
+#include "decklink_dec.h"
+
+#define OFFSET(x) offsetof(struct decklink_cctx, x)
+#define DEC AV_OPT_FLAG_DECODING_PARAM
+
+static const AVOption options[] = {
+    { "list_devices", "list available devices"  , OFFSET(list_devices), AV_OPT_TYPE_INT   , { .i64 = 0   }, 0, 1, DEC },
+    { "list_formats", "list supported formats"  , OFFSET(list_formats), AV_OPT_TYPE_INT   , { .i64 = 0   }, 0, 1, DEC },
+    { NULL },
+};
+
+static const AVClass decklink_demuxer_class = {
+    .class_name = "Blackmagic DeckLink demuxer",
+    .item_name  = av_default_item_name,
+    .option     = options,
+    .version    = LIBAVUTIL_VERSION_INT,
+    .category   = AV_CLASS_CATEGORY_DEVICE_VIDEO_INPUT,
+};
+
+AVInputFormat ff_decklink_demuxer = {
+    .name           = "decklink",
+    .long_name      = NULL_IF_CONFIG_SMALL("Blackmagic DeckLink input"),
+    .flags          = AVFMT_NOFILE | AVFMT_RAWPICTURE,
+    .priv_class     = &decklink_demuxer_class,
+    .priv_data_size = sizeof(struct decklink_cctx),
+    .read_header   = ff_decklink_read_header,
+    .read_packet   = ff_decklink_read_packet,
+    .read_close    = ff_decklink_read_close,
+};