lavd: add decklink output device

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

8 files changed, 756 insertions, 1 deletions

diff --git a/configure b/configure
index a211975cc3..6f572f6acf 100755
--- a/configure
+++ b/configure
@@ -249,6 +249,7 @@ External library support:
                            native MPEG-4/Xvid encoder exists [no]
   --enable-libzmq          enable message passing via libzmq [no]
   --enable-libzvbi         enable teletext support via libzvbi [no]
+  --enable-decklink        enable Blackmagick DeckLink output [no]
   --enable-openal          enable OpenAL 1.1 capture support [no]
   --enable-opencl          enable OpenCL code
   --enable-opengl          enable OpenGL rendering [no]
@@ -1258,6 +1259,7 @@ EXTERNAL_LIBRARY_LIST="
     avisynth
     bzlib
     crystalhd
+    decklink
     fontconfig
     frei0r
     gnutls
@@ -2258,6 +2260,8 @@ alsa_indev_deps="alsa_asoundlib_h snd_pcm_htimestamp"
 alsa_outdev_deps="alsa_asoundlib_h"
 bktr_indev_deps_any="dev_bktr_ioctl_bt848_h machine_ioctl_bt848_h dev_video_bktr_ioctl_bt848_h dev_ic_bt8xx_h"
 caca_outdev_deps="libcaca"
+decklink_outdev_deps="decklink pthreads"
+decklink_outdev_extralibs="-lstdc++"
 dshow_indev_deps="IBaseFilter"
 dshow_indev_extralibs="-lpsapi -lole32 -lstrmiids -luuid"
 dv1394_indev_deps="dv1394"
@@ -4426,6 +4430,7 @@ done
 enabled avisynth          && { { check_lib2 "windows.h" LoadLibrary; } ||
                                { check_lib2 "dlfcn.h" dlopen -ldl; } ||
                                die "ERROR: LoadLibrary/dlopen not found for avisynth"; }
+enabled decklink          && { check_header DeckLinkAPI.h || die "ERROR: DeckLinkAPI.h header not found"; }
 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
diff --git a/doc/outdevs.texi b/doc/outdevs.texi
index d2ccef216a..5eba26fab0 100644
--- a/doc/outdevs.texi
+++ b/doc/outdevs.texi
@@ -120,6 +120,68 @@ ffmpeg -i INPUT -pix_fmt rgb24 -f caca -list_dither colors -
 @end example
 @end itemize
 
+@section decklink
+
+The decklink output device provides playback capabilities for Blackmagic
+DeckLink devices.
+
+To enable this output 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.
+
+@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}.
+
+@item preroll
+Amount of time to preroll video in seconds.
+Defaults to @option{0.5}.
+
+@end table
+
+@subsection Examples
+
+@itemize
+
+@item
+List output devices:
+@example
+ffmpeg -i test.avi -f decklink -list_devices 1 dummy
+@end example
+
+@item
+List supported formats:
+@example
+ffmpeg -i test.avi -f decklink -list_formats 1 'DeckLink Mini Monitor'
+@end example
+
+@item
+Play video clip:
+@example
+ffmpeg -i test.avi -f decklink -pix_fmt uyvy422 'DeckLink Mini Monitor'
+@end example
+
+@item
+Play video clip with non-standard framerate or video size:
+@example
+ffmpeg -i test.avi -f decklink -pix_fmt uyvy422 -s 720x486 -r 24000/1001 'DeckLink Mini Monitor'
+@end example
+
+@end itemize
+
 @section fbdev
 
 Linux framebuffer output device.
diff --git a/libavdevice/Makefile b/libavdevice/Makefile
index fb57c33a80..56db451025 100644
--- a/libavdevice/Makefile
+++ b/libavdevice/Makefile
@@ -17,6 +17,7 @@ OBJS-$(CONFIG_ALSA_OUTDEV)               += alsa-audio-common.o \
                                             alsa-audio-enc.o
 OBJS-$(CONFIG_BKTR_INDEV)                += bktr.o
 OBJS-$(CONFIG_CACA_OUTDEV)               += caca.o
+OBJS-$(CONFIG_DECKLINK_OUTDEV)           += decklink_enc.o decklink_enc_c.o
 OBJS-$(CONFIG_DSHOW_INDEV)               += dshow.o dshow_enummediatypes.o \
                                             dshow_enumpins.o dshow_filter.o \
                                             dshow_pin.o dshow_common.o
diff --git a/libavdevice/alldevices.c b/libavdevice/alldevices.c
index 63bff11b8d..005bbc8e0d 100644
--- a/libavdevice/alldevices.c
+++ b/libavdevice/alldevices.c
@@ -49,6 +49,7 @@ void avdevice_register_all(void)
     REGISTER_INOUTDEV(ALSA,             alsa);
     REGISTER_INDEV   (BKTR,             bktr);
     REGISTER_OUTDEV  (CACA,             caca);
+    REGISTER_OUTDEV  (DECKLINK,         decklink);
     REGISTER_INDEV   (DSHOW,            dshow);
     REGISTER_INDEV   (DV1394,           dv1394);
     REGISTER_INOUTDEV(FBDEV,            fbdev);
diff --git a/libavdevice/decklink_enc.cpp b/libavdevice/decklink_enc.cpp
new file mode 100644
index 0000000000..3d7cbe237c
--- /dev/null
+++ b/libavdevice/decklink_enc.cpp
@@ -0,0 +1,588 @@
+/*
+ * 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
+ */
+
+#include <DeckLinkAPI.h>
+#ifdef _WIN32
+#include <DeckLinkAPI_i.c>
+typedef unsigned long buffercount_type;
+#else
+#include <DeckLinkAPIDispatch.cpp>
+typedef uint32_t buffercount_type;
+#endif
+
+#include <pthread.h>
+#include <semaphore.h>
+
+extern "C" {
+#include "libavformat/avformat.h"
+#include "libavformat/internal.h"
+#include "libavutil/imgutils.h"
+}
+
+#include "decklink_enc.h"
+
+class decklink_callback;
+
+struct decklink_ctx {
+    /* DeckLink SDK interfaces */
+    IDeckLink *dl;
+    IDeckLinkOutput *dlo;
+    decklink_callback *callback;
+
+    /* DeckLink mode information */
+    IDeckLinkDisplayModeIterator *itermode;
+    BMDTimeValue bmd_tb_den;
+    BMDTimeValue bmd_tb_num;
+    BMDDisplayMode bmd_mode;
+    int bmd_width;
+    int bmd_height;
+
+    /* Streams present */
+    int audio;
+    int video;
+
+    /* Status */
+    int playback_started;
+    int64_t last_pts;
+
+    /* Options */
+    int list_devices;
+    int list_formats;
+    double preroll;
+
+    int frames_preroll;
+    int frames_buffer;
+
+    sem_t semaphore;
+
+    int channels;
+};
+
+/* DeckLink callback class declaration */
+class decklink_frame : public IDeckLinkVideoFrame
+{
+public:
+    decklink_frame(struct decklink_ctx *ctx, AVFrame *avframe, long width,
+                   long height, void *buffer) :
+                   _ctx(ctx), _avframe(avframe), _width(width),
+                   _height(height), _buffer(buffer), _refs(0) { }
+
+    virtual long           STDMETHODCALLTYPE GetWidth      (void)          { return _width; }
+    virtual long           STDMETHODCALLTYPE GetHeight     (void)          { return _height; }
+    virtual long           STDMETHODCALLTYPE GetRowBytes   (void)          { return _width<<1; }
+    virtual BMDPixelFormat STDMETHODCALLTYPE GetPixelFormat(void)          { return bmdFormat8BitYUV; }
+    virtual BMDFrameFlags  STDMETHODCALLTYPE GetFlags      (void)          { return bmdVideoOutputFlagDefault; }
+    virtual HRESULT        STDMETHODCALLTYPE GetBytes      (void **buffer) { *buffer = _buffer; return S_OK; }
+
+    virtual HRESULT STDMETHODCALLTYPE GetTimecode     (BMDTimecodeFormat format, IDeckLinkTimecode **timecode) { return S_FALSE; }
+    virtual HRESULT STDMETHODCALLTYPE GetAncillaryData(IDeckLinkVideoFrameAncillary **ancillary)               { return S_FALSE; }
+
+    virtual HRESULT STDMETHODCALLTYPE QueryInterface(REFIID iid, LPVOID *ppv) { return E_NOINTERFACE; }
+    virtual ULONG   STDMETHODCALLTYPE AddRef(void)                            { return ++_refs; }
+    virtual ULONG   STDMETHODCALLTYPE Release(void)                           { if (!--_refs) delete this; return _refs; }
+
+    struct decklink_ctx *_ctx;
+    AVFrame *_avframe;
+
+private:
+    long  _width;
+    long  _height;
+    void *_buffer;
+    int   _refs;
+};
+
+class decklink_callback : public IDeckLinkVideoOutputCallback
+{
+public:
+    virtual HRESULT STDMETHODCALLTYPE ScheduledFrameCompleted(IDeckLinkVideoFrame *_frame, BMDOutputFrameCompletionResult result)
+    {
+        decklink_frame *frame = static_cast<decklink_frame *>(_frame);
+        struct decklink_ctx *ctx = frame->_ctx;
+        AVFrame *avframe = frame->_avframe;
+
+        av_frame_free(&avframe);
+
+        sem_post(&ctx->semaphore);
+
+        return S_OK;
+    }
+    virtual HRESULT STDMETHODCALLTYPE ScheduledPlaybackHasStopped(void)       { return S_OK; }
+    virtual HRESULT STDMETHODCALLTYPE QueryInterface(REFIID iid, LPVOID *ppv) { return E_NOINTERFACE; }
+    virtual ULONG   STDMETHODCALLTYPE AddRef(void)                            { return 1; }
+    virtual ULONG   STDMETHODCALLTYPE Release(void)                           { return 1; }
+};
+
+#ifdef _WIN32
+static IDeckLinkIterator *CreateDeckLinkIteratorInstance(void)
+{
+    IDeckLinkIterator *iter;
+
+    if (CoInitialize(NULL) != S_OK) {
+        av_log(NULL, AV_LOG_ERROR, "COM initialization failed.\n");
+        return NULL;
+    }
+
+    if (CoCreateInstance(CLSID_CDeckLinkIterator, NULL, CLSCTX_ALL,
+                         IID_IDeckLinkIterator, (void**) &iter) != S_OK) {
+        av_log(NULL, AV_LOG_ERROR, "DeckLink drivers not installed.\n");
+        return NULL;
+    }
+
+    return iter;
+}
+#endif
+
+/* free() is needed for a string returned by the DeckLink SDL. */
+#undef free
+
+#ifdef _WIN32
+static char *dup_wchar_to_utf8(wchar_t *w)
+{
+    char *s = NULL;
+    int l = WideCharToMultiByte(CP_UTF8, 0, w, -1, 0, 0, 0, 0);
+    s = (char *) av_malloc(l);
+    if (s)
+        WideCharToMultiByte(CP_UTF8, 0, w, -1, s, l, 0, 0);
+    return s;
+}
+#define DECKLINK_STR    OLECHAR *
+#define DECKLINK_STRDUP dup_wchar_to_utf8
+#else
+#define DECKLINK_STR    const char *
+#define DECKLINK_STRDUP av_strdup
+#endif
+
+static HRESULT IDeckLink_GetDisplayName(IDeckLink *This, const char **displayName)
+{
+    DECKLINK_STR tmpDisplayName;
+    HRESULT hr = This->GetDisplayName(&tmpDisplayName);
+    if (hr != S_OK)
+        return hr;
+    *displayName = DECKLINK_STRDUP(tmpDisplayName);
+    free((void *) tmpDisplayName);
+    return hr;
+}
+
+static int decklink_set_format(struct decklink_ctx *ctx,
+                               int width, int height,
+                               int tb_num, int tb_den)
+{
+    BMDDisplayModeSupport support;
+    IDeckLinkDisplayMode *mode;
+
+    if (tb_num == 1) {
+        tb_num *= 1000;
+        tb_den *= 1000;
+    }
+    ctx->bmd_mode = bmdModeUnknown;
+    while ((ctx->bmd_mode == bmdModeUnknown) && ctx->itermode->Next(&mode) == S_OK) {
+        BMDTimeValue bmd_tb_num, bmd_tb_den;
+        int bmd_width  = mode->GetWidth();
+        int bmd_height = mode->GetHeight();
+
+        mode->GetFrameRate(&bmd_tb_num, &bmd_tb_den);
+
+        if (bmd_width == width && bmd_height == height &&
+            bmd_tb_num == tb_num && bmd_tb_den == tb_den) {
+            ctx->bmd_mode   = mode->GetDisplayMode();
+            ctx->bmd_width  = bmd_width;
+            ctx->bmd_height = bmd_height;
+            ctx->bmd_tb_den = bmd_tb_den;
+            ctx->bmd_tb_num = bmd_tb_num;
+        }
+
+        mode->Release();
+    }
+    if (ctx->bmd_mode == bmdModeUnknown)
+        return -1;
+    if (ctx->dlo->DoesSupportVideoMode(ctx->bmd_mode, bmdFormat8BitYUV,
+                                       bmdVideoOutputFlagDefault,
+                                       &support, NULL) != S_OK)
+        return -1;
+    if (support == bmdDisplayModeSupported)
+        return 0;
+
+    return -1;
+}
+
+static int decklink_setup_video(AVFormatContext *avctx, AVStream *st)
+{
+    struct decklink_cctx *cctx = (struct decklink_cctx *) avctx->priv_data;
+    struct decklink_ctx *ctx = (struct decklink_ctx *) cctx->ctx;
+    AVCodecContext *c = st->codec;
+
+    if (ctx->video) {
+        av_log(avctx, AV_LOG_ERROR, "Only one video stream is supported!\n");
+        return -1;
+    }
+
+    if (c->pix_fmt != AV_PIX_FMT_UYVY422) {
+        av_log(avctx, AV_LOG_ERROR, "Unsupported pixel format!"
+               " Only AV_PIX_FMT_UYVY422 is supported.\n");
+        return -1;
+    }
+    if (decklink_set_format(ctx, c->width, c->height,
+                            c->time_base.num, c->time_base.den)) {
+        av_log(avctx, AV_LOG_ERROR, "Unsupported video size or framerate!"
+               " Check available formats with -list_formats 1.\n");
+        return -1;
+    }
+    if (ctx->dlo->EnableVideoOutput(ctx->bmd_mode,
+                                    bmdVideoOutputFlagDefault) != S_OK) {
+        av_log(avctx, AV_LOG_ERROR, "Could not enable video output!\n");
+        return -1;
+    }
+
+    /* Set callback. */
+    ctx->callback = new decklink_callback();
+    ctx->dlo->SetScheduledFrameCompletionCallback(ctx->callback);
+
+    /* Start video semaphore. */
+    ctx->frames_preroll = c->time_base.den * ctx->preroll;
+    if (c->time_base.den > 1000)
+        ctx->frames_preroll /= 1000;
+
+    /* Buffer twice as many frames as the preroll. */
+    ctx->frames_buffer = ctx->frames_preroll * 2;
+    ctx->frames_buffer = FFMIN(ctx->frames_buffer, 60);
+    sem_init(&ctx->semaphore, 0, ctx->frames_buffer);
+
+    /* The device expects the framerate to be fixed. */
+    avpriv_set_pts_info(st, 64, c->time_base.num, c->time_base.den);
+
+    ctx->video = 1;
+
+    return 0;
+}
+
+static int decklink_setup_audio(AVFormatContext *avctx, AVStream *st)
+{
+    struct decklink_cctx *cctx = (struct decklink_cctx *) avctx->priv_data;
+    struct decklink_ctx *ctx = (struct decklink_ctx *) cctx->ctx;
+    AVCodecContext *c = st->codec;
+
+    if (ctx->audio) {
+        av_log(avctx, AV_LOG_ERROR, "Only one audio stream is supported!\n");
+        return -1;
+    }
+    if (c->sample_rate != 48000) {
+        av_log(avctx, AV_LOG_ERROR, "Unsupported sample rate!"
+               " Only 48kHz is supported.\n");
+        return -1;
+    }
+    if (c->channels != 2 && c->channels != 8) {
+        av_log(avctx, AV_LOG_ERROR, "Unsupported number of channels!"
+               " Only stereo and 7.1 are supported.\n");
+        return -1;
+    }
+    if (ctx->dlo->EnableAudioOutput(bmdAudioSampleRate48kHz,
+                                    bmdAudioSampleType16bitInteger,
+                                    c->channels,
+                                    bmdAudioOutputStreamTimestamped) != S_OK) {
+        av_log(avctx, AV_LOG_ERROR, "Could not enable audio output!\n");
+        return -1;
+    }
+    if (ctx->dlo->BeginAudioPreroll() != S_OK) {
+        av_log(avctx, AV_LOG_ERROR, "Could not begin audio preroll!\n");
+        return -1;
+    }
+
+    /* The device expects the sample rate to be fixed. */
+    avpriv_set_pts_info(st, 64, 1, c->sample_rate);
+    ctx->channels = c->channels;
+
+    ctx->audio = 1;
+
+    return 0;
+}
+
+av_cold int ff_decklink_write_trailer(AVFormatContext *avctx)
+{
+    struct decklink_cctx *cctx = (struct decklink_cctx *) avctx->priv_data;
+    struct decklink_ctx *ctx = (struct decklink_ctx *) cctx->ctx;
+
+    if (ctx->playback_started) {
+        BMDTimeValue actual;
+        ctx->dlo->StopScheduledPlayback(ctx->last_pts * ctx->bmd_tb_num,
+                                        &actual, ctx->bmd_tb_den);
+        ctx->dlo->DisableVideoOutput();
+        if (ctx->audio)
+            ctx->dlo->DisableAudioOutput();
+    }
+
+    if (ctx->dlo)
+        ctx->dlo->Release();
+    if (ctx->dl)
+        ctx->dl->Release();
+
+    if (ctx->callback)
+        delete ctx->callback;
+
+    sem_destroy(&ctx->semaphore);
+
+    av_freep(&cctx->ctx);
+
+    return 0;
+}
+
+static int decklink_write_video_packet(AVFormatContext *avctx, AVPacket *pkt)
+{
+    struct decklink_cctx *cctx = (struct decklink_cctx *) avctx->priv_data;
+    struct decklink_ctx *ctx = (struct decklink_ctx *) cctx->ctx;
+    AVPicture *avpicture = (AVPicture *) pkt->data;
+    AVFrame *avframe, *tmp;
+    decklink_frame *frame;
+    buffercount_type buffered;
+    HRESULT hr;
+
+    /* HACK while av_uncoded_frame() isn't implemented */
+    int ret;
+
+    tmp = av_frame_alloc();
+    if (!tmp)
+        return AVERROR(ENOMEM);
+    tmp->format = AV_PIX_FMT_UYVY422;
+    tmp->width  = ctx->bmd_width;
+    tmp->height = ctx->bmd_height;
+    ret = av_frame_get_buffer(tmp, 32);
+    if (ret < 0) {
+        av_frame_free(&tmp);
+        return ret;
+    }
+    av_image_copy(tmp->data, tmp->linesize, (const uint8_t **) avpicture->data,
+                  avpicture->linesize, (AVPixelFormat) tmp->format, tmp->width,
+                  tmp->height);
+    avframe = av_frame_clone(tmp);
+    av_frame_free(&tmp);
+    if (!avframe) {
+        av_log(avctx, AV_LOG_ERROR, "Could not clone video frame.\n");
+        return AVERROR(EIO);
+    }
+    /* end HACK */
+
+    frame = new decklink_frame(ctx, avframe, ctx->bmd_width, ctx->bmd_height,
+                               (void *) avframe->data[0]);
+    if (!frame) {
+        av_log(avctx, AV_LOG_ERROR, "Could not create new frame.\n");
+        return AVERROR(EIO);
+    }
+
+    /* Always keep at most one second of frames buffered. */
+    sem_wait(&ctx->semaphore);
+
+    /* Schedule frame for playback. */
+    hr = ctx->dlo->ScheduleVideoFrame((struct IDeckLinkVideoFrame *) frame,
+                                      pkt->pts * ctx->bmd_tb_num,
+                                      ctx->bmd_tb_num, ctx->bmd_tb_den);
+    if (hr != S_OK) {
+        av_log(avctx, AV_LOG_ERROR, "Could not schedule video frame."
+                " error %08x.\n", (uint32_t) hr);
+        frame->Release();
+        return AVERROR(EIO);
+    }
+
+    ctx->dlo->GetBufferedVideoFrameCount(&buffered);
+    av_log(avctx, AV_LOG_DEBUG, "Buffered video frames: %d.\n", (int) buffered);
+    if (pkt->pts > 2 && buffered <= 2)
+        av_log(avctx, AV_LOG_WARNING, "There are not enough buffered video frames."
+               " Video may misbehave!\n");
+
+    /* Preroll video frames. */
+    if (!ctx->playback_started && pkt->pts > ctx->frames_preroll) {
+        av_log(avctx, AV_LOG_DEBUG, "Ending audio preroll.\n");
+        if (ctx->audio && ctx->dlo->EndAudioPreroll() != S_OK) {
+            av_log(avctx, AV_LOG_ERROR, "Could not end audio preroll!\n");
+            return AVERROR(EIO);
+        }
+        av_log(avctx, AV_LOG_DEBUG, "Starting scheduled playback.\n");
+        if (ctx->dlo->StartScheduledPlayback(0, ctx->bmd_tb_den, 1.0) != S_OK) {
+            av_log(avctx, AV_LOG_ERROR, "Could not start scheduled playback!\n");
+            return AVERROR(EIO);
+        }
+        ctx->playback_started = 1;
+    }
+
+    return 0;
+}
+
+static int decklink_write_audio_packet(AVFormatContext *avctx, AVPacket *pkt)
+{
+    struct decklink_cctx *cctx = (struct decklink_cctx *) avctx->priv_data;
+    struct decklink_ctx *ctx = (struct decklink_ctx *) cctx->ctx;
+    int sample_count = pkt->size / (ctx->channels << 1);
+    buffercount_type buffered;
+
+    ctx->dlo->GetBufferedAudioSampleFrameCount(&buffered);
+    if (pkt->pts > 1 && !buffered)
+        av_log(avctx, AV_LOG_WARNING, "There's no buffered audio."
+               " Audio will misbehave!\n");
+
+    if (ctx->dlo->ScheduleAudioSamples(pkt->data, sample_count, pkt->pts,
+                                       bmdAudioSampleRate48kHz, NULL) != S_OK) {
+        av_log(avctx, AV_LOG_ERROR, "Could not schedule audio samples.\n");
+        return AVERROR(EIO);
+    }
+
+    return 0;
+}
+
+extern "C" {
+
+av_cold int ff_decklink_write_header(AVFormatContext *avctx)
+{
+    struct decklink_cctx *cctx = (struct decklink_cctx *) avctx->priv_data;
+    struct decklink_ctx *ctx;
+    IDeckLinkIterator *iter;
+    IDeckLink *dl = NULL;
+    unsigned int n;
+
+    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) {
+        av_log(avctx, AV_LOG_INFO, "Blackmagic DeckLink devices:\n");
+        while (iter->Next(&dl) == S_OK) {
+            const char *displayName;
+            IDeckLink_GetDisplayName(dl, &displayName);
+            av_log(avctx, AV_LOG_INFO, "\t'%s'\n", displayName);
+            av_free((void *) displayName);
+            dl->Release();
+        }
+        iter->Release();
+        return AVERROR_EXIT;
+    }
+
+    /* Open device. */
+    while (iter->Next(&dl) == S_OK) {
+        const char *displayName;
+        IDeckLink_GetDisplayName(dl, &displayName);
+        if (!strcmp(avctx->filename, 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", avctx->filename);
+        return AVERROR(EIO);
+    }
+
+    /* Get output device. */
+    if (ctx->dl->QueryInterface(IID_IDeckLinkOutput, (void **) &ctx->dlo) != S_OK) {
+        av_log(avctx, AV_LOG_ERROR, "Could not open output device from '%s'\n",
+               avctx->filename);
+        ctx->dl->Release();
+        return AVERROR(EIO);
+    }
+
+    if (ctx->dlo->GetDisplayModeIterator(&ctx->itermode) != S_OK) {
+        av_log(avctx, AV_LOG_ERROR, "Could not get Display Mode Iterator\n");
+        ctx->dl->Release();
+        return AVERROR(EIO);
+    }
+
+    /* List supported formats. */
+    if (ctx->list_formats) {
+        IDeckLinkDisplayMode *mode;
+
+        av_log(avctx, AV_LOG_INFO, "Supported formats for '%s':\n",
+               avctx->filename);
+        while (ctx->itermode->Next(&mode) == S_OK) {
+            BMDTimeValue tb_num, tb_den;
+            mode->GetFrameRate(&tb_num, &tb_den);
+            av_log(avctx, AV_LOG_INFO, "\t%ldx%ld at %d/%d fps",
+                   mode->GetWidth(), mode->GetHeight(),
+                   (int) tb_den, (int) tb_num);
+            switch (mode->GetFieldDominance()) {
+            case bmdLowerFieldFirst:
+            av_log(avctx, AV_LOG_INFO, " (interlaced, lower field first)"); break;
+            case bmdUpperFieldFirst:
+            av_log(avctx, AV_LOG_INFO, " (interlaced, upper field first)"); break;
+            }
+            av_log(avctx, AV_LOG_INFO, "\n");
+            mode->Release();
+        }
+
+        ctx->itermode->Release();
+        ctx->dlo->Release();
+        ctx->dl->Release();
+        return AVERROR_EXIT;
+    }
+
+    /* Setup streams. */
+    for (n = 0; n < avctx->nb_streams; n++) {
+        AVStream *st = avctx->streams[n];
+        AVCodecContext *c = st->codec;
+        if        (c->codec_type == AVMEDIA_TYPE_AUDIO) {
+            if (decklink_setup_audio(avctx, st))
+                goto error;
+        } else if (c->codec_type == AVMEDIA_TYPE_VIDEO) {
+            if (decklink_setup_video(avctx, st))
+                goto error;
+        } else {
+            av_log(avctx, AV_LOG_ERROR, "Unsupported stream type.\n");
+            goto error;
+        }
+    }
+    ctx->itermode->Release();
+
+    return 0;
+
+error:
+
+    ctx->dlo->Release();
+    ctx->dl->Release();
+
+    return AVERROR(EIO);
+}
+
+int ff_decklink_write_packet(AVFormatContext *avctx, AVPacket *pkt)
+{
+    struct decklink_cctx *cctx = (struct decklink_cctx *) avctx->priv_data;
+    struct decklink_ctx *ctx = (struct decklink_ctx *) cctx->ctx;
+    AVStream *st = avctx->streams[pkt->stream_index];
+
+    ctx->last_pts = FFMAX(ctx->last_pts, pkt->pts);
+
+    if      (st->codec->codec_type == AVMEDIA_TYPE_VIDEO)
+        return decklink_write_video_packet(avctx, pkt);
+    else if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO)
+        return decklink_write_audio_packet(avctx, pkt);
+
+    return AVERROR(EIO);
+}
+
+} /* extern "C" */
diff --git a/libavdevice/decklink_enc.h b/libavdevice/decklink_enc.h
new file mode 100644
index 0000000000..0b9ad8f79e
--- /dev/null
+++ b/libavdevice/decklink_enc.h
@@ -0,0 +1,43 @@
+/*
+ * 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
+ */
+
+struct decklink_cctx {
+    const AVClass *cclass;
+
+    void *ctx;
+
+    /* Options */
+    int list_devices;
+    int list_formats;
+    double preroll;
+};
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+int ff_decklink_write_header(AVFormatContext *avctx);
+int ff_decklink_write_packet(AVFormatContext *avctx, AVPacket *pkt);
+int ff_decklink_write_trailer(AVFormatContext *avctx);
+
+#ifdef __cplusplus
+} /* extern "C" */
+#endif
diff --git a/libavdevice/decklink_enc_c.c b/libavdevice/decklink_enc_c.c
new file mode 100644
index 0000000000..b98e0b4fa4
--- /dev/null
+++ b/libavdevice/decklink_enc_c.c
@@ -0,0 +1,55 @@
+/*
+ * 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
+ */
+
+#include "libavformat/avformat.h"
+#include "libavutil/opt.h"
+
+#include "decklink_enc.h"
+
+#define OFFSET(x) offsetof(struct decklink_cctx, x)
+#define ENC AV_OPT_FLAG_ENCODING_PARAM
+static const AVOption options[] = {
+    { "list_devices", "list available devices"  , OFFSET(list_devices), AV_OPT_TYPE_INT   , { .i64 = 0   }, 0, 1, ENC },
+    { "list_formats", "list supported formats"  , OFFSET(list_formats), AV_OPT_TYPE_INT   , { .i64 = 0   }, 0, 1, ENC },
+    { "preroll"     , "video preroll in seconds", OFFSET(preroll     ), AV_OPT_TYPE_DOUBLE, { .dbl = 0.5 }, 0, 5, ENC },
+    { NULL },
+};
+
+static const AVClass decklink_muxer_class = {
+    .class_name = "Blackmagic DeckLink muxer",
+    .item_name  = av_default_item_name,
+    .option     = options,
+    .version    = LIBAVUTIL_VERSION_INT,
+};
+
+AVOutputFormat ff_decklink_muxer = {
+    .name           = "decklink",
+    .long_name      = NULL_IF_CONFIG_SMALL("Blackmagic DeckLink output"),
+    .audio_codec    = AV_CODEC_ID_PCM_S16LE,
+    .video_codec    = AV_CODEC_ID_RAWVIDEO,
+    .subtitle_codec = AV_CODEC_ID_NONE,
+    .flags          = AVFMT_NOFILE | AVFMT_RAWPICTURE,
+    .priv_class     = &decklink_muxer_class,
+    .priv_data_size = sizeof(struct decklink_cctx),
+    .write_header   = ff_decklink_write_header,
+    .write_packet   = ff_decklink_write_packet,
+    .write_trailer  = ff_decklink_write_trailer,
+};
diff --git a/libavdevice/version.h b/libavdevice/version.h
index a62177518f..0dedc73551 100644
--- a/libavdevice/version.h
+++ b/libavdevice/version.h
@@ -28,7 +28,7 @@
 #include "libavutil/version.h"
 
 #define LIBAVDEVICE_VERSION_MAJOR  55
-#define LIBAVDEVICE_VERSION_MINOR   7
+#define LIBAVDEVICE_VERSION_MINOR   8
 #define LIBAVDEVICE_VERSION_MICRO 100
 
 #define LIBAVDEVICE_VERSION_INT AV_VERSION_INT(LIBAVDEVICE_VERSION_MAJOR, \