/*

  * Blackmagic DeckLink input

  * Copyright (c) 2013-2014 Luca Barbato, Deti Fliegl

  * Copyright (c) 2014 Rafaël Carré

  * Copyright (c) 2017 Akamai Technologies, Inc.

  *
  * 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 internal.h first to avoid conflict between winsock.h (used by
  * DeckLink headers) and winsock2.h (used by libavformat) in MSVC++ builds */
 extern "C" {
 #include "libavformat/internal.h"
 }
 

 #include <DeckLinkAPI.h>
 
 extern "C" {

 #include "config.h"

 #include "libavformat/avformat.h"

 #include "libavutil/avassert.h"

 #include "libavutil/avutil.h"

 #include "libavutil/common.h"

 #include "libavutil/imgutils.h"

 #include "libavutil/intreadwrite.h"

 #include "libavutil/time.h"
 #include "libavutil/mathematics.h"

 #include "libavutil/reverse.h"

 #include "avdevice.h"

 #if CONFIG_LIBZVBI
 #include <libzvbi.h>
 #endif

 }
 
 #include "decklink_common.h"
 #include "decklink_dec.h"
 

 #define MAX_WIDTH_VANC 1920

 const BMDDisplayMode AUTODETECT_DEFAULT_MODE = bmdModeNTSC;

 typedef struct VANCLineNumber {
     BMDDisplayMode mode;
     int vanc_start;
     int field0_vanc_end;
     int field1_vanc_start;
     int vanc_end;
 } VANCLineNumber;
 
 /* These VANC line numbers need not be very accurate. In any case
  * GetBufferForVerticalBlankingLine() will return an error when invalid
  * ancillary line number was requested. We just need to make sure that the
  * entire VANC region is covered, while making sure we don't decode VANC of
  * another source during switching*/
 static VANCLineNumber vanc_line_numbers[] = {
     /* SD Modes */
 
     {bmdModeNTSC, 11, 19, 274, 282},
     {bmdModeNTSC2398, 11, 19, 274, 282},
     {bmdModePAL, 7, 22, 320, 335},
     {bmdModeNTSCp, 11, -1, -1, 39},
     {bmdModePALp, 7, -1, -1, 45},
 
     /* HD 1080 Modes */
 
     {bmdModeHD1080p2398, 8, -1, -1, 42},
     {bmdModeHD1080p24, 8, -1, -1, 42},
     {bmdModeHD1080p25, 8, -1, -1, 42},
     {bmdModeHD1080p2997, 8, -1, -1, 42},
     {bmdModeHD1080p30, 8, -1, -1, 42},
     {bmdModeHD1080i50, 8, 20, 570, 585},
     {bmdModeHD1080i5994, 8, 20, 570, 585},
     {bmdModeHD1080i6000, 8, 20, 570, 585},
     {bmdModeHD1080p50, 8, -1, -1, 42},
     {bmdModeHD1080p5994, 8, -1, -1, 42},
     {bmdModeHD1080p6000, 8, -1, -1, 42},
 
      /* HD 720 Modes */
 
     {bmdModeHD720p50, 8, -1, -1, 26},
     {bmdModeHD720p5994, 8, -1, -1, 26},
     {bmdModeHD720p60, 8, -1, -1, 26},
 
     /* For all other modes, for which we don't support VANC */
     {bmdModeUnknown, 0, -1, -1, -1}
 };
 
 static int get_vanc_line_idx(BMDDisplayMode mode)
 {
     unsigned int i;
     for (i = 0; i < FF_ARRAY_ELEMS(vanc_line_numbers); i++) {
         if (mode == vanc_line_numbers[i].mode)
             return i;
     }
     /* Return the VANC idx for Unknown mode */
     return i - 1;
 }
 

 static inline void clear_parity_bits(uint16_t *buf, int len) {
     int i;
     for (i = 0; i < len; i++)
         buf[i] &= 0xff;
 }
 
 static int check_vanc_parity_checksum(uint16_t *buf, int len, uint16_t checksum) {
     int i;
     uint16_t vanc_sum = 0;
     for (i = 3; i < len - 1; i++) {
         uint16_t v = buf[i];
         int np = v >> 8;

         int p = av_parity(v & 0xff);

         if ((!!p ^ !!(v & 0x100)) || (np != 1 && np != 2)) {
             // Parity check failed
             return -1;
         }
         vanc_sum += v;
     }
     vanc_sum &= 0x1ff;
     vanc_sum |= ((~vanc_sum & 0x100) << 1);
     if (checksum != vanc_sum) {
         // Checksum verification failed
         return -1;
     }
     return 0;
 }
 

 /* The 10-bit VANC data is packed in V210, we only need the luma component. */
 static void extract_luma_from_v210(uint16_t *dst, const uint8_t *src, int width)
 {
     int i;

     for (i = 0; i < width / 3; i++) {

         *dst++ = (src[1] >> 2) + ((src[2] & 15) << 6);
         *dst++ =  src[4]       + ((src[5] &  3) << 8);
         *dst++ = (src[6] >> 4) + ((src[7] & 63) << 4);
         src += 8;
     }
 }
 

 static void unpack_v210(uint16_t *dst, const uint8_t *src, int width)
 {
     int i;
     for (i = 0; i < width * 2 / 3; i++) {
         *dst++ =  src[0]       + ((src[1] & 3)  << 8);
         *dst++ = (src[1] >> 2) + ((src[2] & 15) << 6);
         *dst++ = (src[2] >> 4) + ((src[3] & 63) << 4);
         src += 4;
     }
 }
 

 static uint8_t calc_parity_and_line_offset(int line)
 {
     uint8_t ret = (line < 313) << 5;
     if (line >= 7 && line <= 22)
         ret += line;
     if (line >= 320 && line <= 335)
         ret += (line - 313);
     return ret;
 }
 

 static void fill_data_unit_head(int line, uint8_t *tgt)
 {
     tgt[0] = 0x02; // data_unit_id
     tgt[1] = 0x2c; // data_unit_length
     tgt[2] = calc_parity_and_line_offset(line); // field_parity, line_offset
     tgt[3] = 0xe4; // framing code
 }
 

 #if CONFIG_LIBZVBI

 static uint8_t* teletext_data_unit_from_vbi_data(int line, uint8_t *src, uint8_t *tgt, vbi_pixfmt fmt)

 {
     vbi_bit_slicer slicer;
 

     vbi_bit_slicer_init(&slicer, 720, 13500000, 6937500, 6937500, 0x00aaaae4, 0xffff, 18, 6, 42 * 8, VBI_MODULATION_NRZ_MSB, fmt);

 
     if (vbi_bit_slice(&slicer, src, tgt + 4) == FALSE)

         return tgt;

     fill_data_unit_head(line, tgt);

     return tgt + 46;
 }
 
 static uint8_t* teletext_data_unit_from_vbi_data_10bit(int line, uint8_t *src, uint8_t *tgt)
 {
     uint8_t y[720];
     uint8_t *py = y;
     uint8_t *pend = y + 720;
     /* The 10-bit VBI data is packed in V210, but libzvbi only supports 8-bit,
      * so we extract the 8 MSBs of the luma component, that is enough for
      * teletext bit slicing. */
     while (py < pend) {
         *py++ = (src[1] >> 4) + ((src[2] & 15) << 4);
         *py++ = (src[4] >> 2) + ((src[5] & 3 ) << 6);
         *py++ = (src[6] >> 6) + ((src[7] & 63) << 2);
         src += 8;
     }
     return teletext_data_unit_from_vbi_data(line, y, tgt, VBI_PIXFMT_YUV420);

 }
 #endif
 

 static uint8_t* teletext_data_unit_from_op47_vbi_packet(int line, uint16_t *py, uint8_t *tgt)
 {
     int i;
 
     if (py[0] != 0x255 || py[1] != 0x255 || py[2] != 0x227)
         return tgt;
 
     fill_data_unit_head(line, tgt);
 
     py += 3;
     tgt += 4;
 
     for (i = 0; i < 42; i++)
        *tgt++ = ff_reverse[py[i] & 255];
 
     return tgt;
 }
 
 static int linemask_matches(int line, int64_t mask)
 {
     int shift = -1;
     if (line >= 6 && line <= 22)
         shift = line - 6;
     if (line >= 318 && line <= 335)
         shift = line - 318 + 17;
     return shift >= 0 && ((1ULL << shift) & mask);
 }
 
 static uint8_t* teletext_data_unit_from_op47_data(uint16_t *py, uint16_t *pend, uint8_t *tgt, int64_t wanted_lines)
 {
     if (py < pend - 9) {
         if (py[0] == 0x151 && py[1] == 0x115 && py[3] == 0x102) {       // identifier, identifier, format code for WST teletext
             uint16_t *descriptors = py + 4;
             int i;
             py += 9;
             for (i = 0; i < 5 && py < pend - 45; i++, py += 45) {
                 int line = (descriptors[i] & 31) + (!(descriptors[i] & 128)) * 313;
                 if (line && linemask_matches(line, wanted_lines))
                     tgt = teletext_data_unit_from_op47_vbi_packet(line, py, tgt);
             }
         }
     }
     return tgt;
 }
 
 static uint8_t* teletext_data_unit_from_ancillary_packet(uint16_t *py, uint16_t *pend, uint8_t *tgt, int64_t wanted_lines, int allow_multipacket)
 {
     uint16_t did = py[0];                                               // data id
     uint16_t sdid = py[1];                                              // secondary data id
     uint16_t dc = py[2] & 255;                                          // data count
     py += 3;
     pend = FFMIN(pend, py + dc);
     if (did == 0x143 && sdid == 0x102) {                                // subtitle distribution packet
         tgt = teletext_data_unit_from_op47_data(py, pend, tgt, wanted_lines);
     } else if (allow_multipacket && did == 0x143 && sdid == 0x203) {    // VANC multipacket
         py += 2;                                                        // priority, line/field
         while (py < pend - 3) {
             tgt = teletext_data_unit_from_ancillary_packet(py, pend, tgt, wanted_lines, 0);
             py += 4 + (py[2] & 255);                                    // ndid, nsdid, ndc, line/field
         }
     }
     return tgt;
 }
 

 static uint8_t *vanc_to_cc(AVFormatContext *avctx, uint16_t *buf, size_t words,
                            unsigned &cc_count)

 {

     size_t i, len = (buf[5] & 0xff) + 6 + 1;
     uint8_t cdp_sum, rate;
     uint16_t hdr, ftr;
     uint8_t *cc;
     uint16_t *cdp = &buf[6]; // CDP follows
     if (cdp[0] != 0x96 || cdp[1] != 0x69) {
         av_log(avctx, AV_LOG_WARNING, "Invalid CDP header 0x%.2x 0x%.2x\n", cdp[0], cdp[1]);
         return NULL;
     }

     len -= 7; // remove VANC header and checksum
 
     if (cdp[2] != len) {
         av_log(avctx, AV_LOG_WARNING, "CDP len %d != %zu\n", cdp[2], len);
         return NULL;
     }
 
     cdp_sum = 0;
     for (i = 0; i < len - 1; i++)
         cdp_sum += cdp[i];
     cdp_sum = cdp_sum ? 256 - cdp_sum : 0;
     if (cdp[len - 1] != cdp_sum) {
         av_log(avctx, AV_LOG_WARNING, "CDP checksum invalid 0x%.4x != 0x%.4x\n", cdp_sum, cdp[len-1]);
         return NULL;
     }
 
     rate = cdp[3];
     if (!(rate & 0x0f)) {
         av_log(avctx, AV_LOG_WARNING, "CDP frame rate invalid (0x%.2x)\n", rate);
         return NULL;
     }
     rate >>= 4;
     if (rate > 8) {
         av_log(avctx, AV_LOG_WARNING, "CDP frame rate invalid (0x%.2x)\n", rate);
         return NULL;
     }
 
     if (!(cdp[4] & 0x43)) /* ccdata_present | caption_service_active | reserved */ {
         av_log(avctx, AV_LOG_WARNING, "CDP flags invalid (0x%.2x)\n", cdp[4]);
         return NULL;
     }
 
     hdr = (cdp[5] << 8) | cdp[6];
     if (cdp[7] != 0x72) /* ccdata_id */ {
         av_log(avctx, AV_LOG_WARNING, "Invalid ccdata_id 0x%.2x\n", cdp[7]);
         return NULL;
     }
 
     cc_count = cdp[8];
     if (!(cc_count & 0xe0)) {
         av_log(avctx, AV_LOG_WARNING, "Invalid cc_count 0x%.2x\n", cc_count);
         return NULL;
     }
 
     cc_count &= 0x1f;
     if ((len - 13) < cc_count * 3) {
         av_log(avctx, AV_LOG_WARNING, "Invalid cc_count %d (> %zu)\n", cc_count * 3, len - 13);
         return NULL;
     }
 
     if (cdp[len - 4] != 0x74) /* footer id */ {
         av_log(avctx, AV_LOG_WARNING, "Invalid footer id 0x%.2x\n", cdp[len-4]);
         return NULL;
     }
 
     ftr = (cdp[len - 3] << 8) | cdp[len - 2];
     if (ftr != hdr) {
         av_log(avctx, AV_LOG_WARNING, "Header 0x%.4x != Footer 0x%.4x\n", hdr, ftr);
         return NULL;
     }
 
     cc = (uint8_t *)av_malloc(cc_count * 3);
     if (cc == NULL) {
         av_log(avctx, AV_LOG_WARNING, "CC - av_malloc failed for cc_count = %d\n", cc_count);
         return NULL;
     }
 
     for (size_t i = 0; i < cc_count; i++) {
         cc[3*i + 0] = cdp[9 + 3*i+0] /* & 3 */;
         cc[3*i + 1] = cdp[9 + 3*i+1];
         cc[3*i + 2] = cdp[9 + 3*i+2];
     }
 
     cc_count *= 3;
     return cc;
 }
 

 static uint8_t *get_metadata(AVFormatContext *avctx, uint16_t *buf, size_t width,
                              uint8_t *tgt, size_t tgt_size, AVPacket *pkt)

 {
     decklink_cctx *cctx = (struct decklink_cctx *) avctx->priv_data;
     uint16_t *max_buf = buf + width;
 
     while (buf < max_buf - 6) {
         int len;
         uint16_t did = buf[3] & 0xFF;                                  // data id
         uint16_t sdid = buf[4] & 0xFF;                                 // secondary data id
         /* Check for VANC header */
         if (buf[0] != 0 || buf[1] != 0x3ff || buf[2] != 0x3ff) {
             return tgt;
         }
 
         len = (buf[5] & 0xff) + 6 + 1;
         if (len > max_buf - buf) {
             av_log(avctx, AV_LOG_WARNING, "Data Count (%d) > data left (%zu)\n",
                     len, max_buf - buf);
             return tgt;
         }
 
         if (did == 0x43 && (sdid == 0x02 || sdid == 0x03) && cctx->teletext_lines &&
             width == 1920 && tgt_size >= 1920) {
             if (check_vanc_parity_checksum(buf, len, buf[len - 1]) < 0) {
                 av_log(avctx, AV_LOG_WARNING, "VANC parity or checksum incorrect\n");
                 goto skip_packet;
             }

             tgt = teletext_data_unit_from_ancillary_packet(buf + 3, buf + len, tgt, cctx->teletext_lines, 1);

         } else if (did == 0x61 && sdid == 0x01) {
             unsigned int data_len;
             uint8_t *data;
             if (check_vanc_parity_checksum(buf, len, buf[len - 1]) < 0) {
                 av_log(avctx, AV_LOG_WARNING, "VANC parity or checksum incorrect\n");
                 goto skip_packet;
             }
             clear_parity_bits(buf, len);
             data = vanc_to_cc(avctx, buf, width, data_len);
             if (data) {

                 if (av_packet_add_side_data(pkt, AV_PKT_DATA_A53_CC, data, data_len) < 0)
                     av_free(data);

             }

         } else {

             av_log(avctx, AV_LOG_DEBUG, "Unknown meta data DID = 0x%.2x SDID = 0x%.2x\n",
                     did, sdid);

         }

 skip_packet:
         buf += len;

     }

     return tgt;
 }
 

 static void avpacket_queue_init(AVFormatContext *avctx, AVPacketQueue *q)
 {

     struct decklink_cctx *ctx = (struct decklink_cctx *)avctx->priv_data;

     memset(q, 0, sizeof(AVPacketQueue));
     pthread_mutex_init(&q->mutex, NULL);
     pthread_cond_init(&q->cond, NULL);
     q->avctx = avctx;

     q->max_q_size = ctx->queue_size;

 }
 
 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_packet_unref(&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 > maximum queue size

     if (avpacket_queue_size(q) > (uint64_t)q->max_q_size) {

         av_log(q->avctx, AV_LOG_WARNING,  "Decklink input buffer overrun!\n");
         return -1;
     }

     /* ensure the packet is reference counted */
     if (av_packet_make_refcounted(pkt) < 0) {

         return -1;
     }

 
     pkt1 = (AVPacketList *)av_malloc(sizeof(AVPacketList));
     if (!pkt1) {

         return -1;
     }

     av_packet_move_ref(&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;

     no_video = 0;

     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;
 }
 

 static int64_t get_pkt_pts(IDeckLinkVideoInputFrame *videoFrame,
                            IDeckLinkAudioInputPacket *audioFrame,
                            int64_t wallclock,

                            int64_t abs_wallclock,

                            DecklinkPtsSource pts_src,

                            AVRational time_base, int64_t *initial_pts,
                            int copyts)

 {
     int64_t pts = AV_NOPTS_VALUE;
     BMDTimeValue bmd_pts;
     BMDTimeValue bmd_duration;
     HRESULT res = E_INVALIDARG;
     switch (pts_src) {
         case PTS_SRC_AUDIO:
             if (audioFrame)
                 res = audioFrame->GetPacketTime(&bmd_pts, time_base.den);
             break;
         case PTS_SRC_VIDEO:
             if (videoFrame)
                 res = videoFrame->GetStreamTime(&bmd_pts, &bmd_duration, time_base.den);
             break;
         case PTS_SRC_REFERENCE:
             if (videoFrame)
                 res = videoFrame->GetHardwareReferenceTimestamp(time_base.den, &bmd_pts, &bmd_duration);
             break;
         case PTS_SRC_WALLCLOCK:

             /* fall through */
         case PTS_SRC_ABS_WALLCLOCK:

         {
             /* MSVC does not support compound literals like AV_TIME_BASE_Q
              * in C++ code (compiler error C4576) */
             AVRational timebase;
             timebase.num = 1;
             timebase.den = AV_TIME_BASE;

             if (pts_src == PTS_SRC_WALLCLOCK)
                 pts = av_rescale_q(wallclock, timebase, time_base);
             else
                 pts = av_rescale_q(abs_wallclock, timebase, time_base);

             break;

         }

     }
     if (res == S_OK)
         pts = bmd_pts / time_base.num;
 

     if (!copyts) {
         if (pts != AV_NOPTS_VALUE && *initial_pts == AV_NOPTS_VALUE)
             *initial_pts = pts;
         if (*initial_pts != AV_NOPTS_VALUE)
             pts -= *initial_pts;
     }

 
     return pts;
 }
 

 HRESULT decklink_input_callback::VideoInputFrameArrived(
     IDeckLinkVideoInputFrame *videoFrame, IDeckLinkAudioInputPacket *audioFrame)
 {
     void *frameBytes;
     void *audioFrameBytes;
     BMDTimeValue frameTime;
     BMDTimeValue frameDuration;

     int64_t wallclock = 0, abs_wallclock = 0;

     struct decklink_cctx *cctx = (struct decklink_cctx *) avctx->priv_data;

     if (ctx->autodetect) {
         if (videoFrame && !(videoFrame->GetFlags() & bmdFrameHasNoInputSource) &&
             ctx->bmd_mode == bmdModeUnknown)
         {
             ctx->bmd_mode = AUTODETECT_DEFAULT_MODE;
         }
         return S_OK;
     }
 

     ctx->frameCount++;

     if (ctx->audio_pts_source == PTS_SRC_WALLCLOCK || ctx->video_pts_source == PTS_SRC_WALLCLOCK)
         wallclock = av_gettime_relative();

     if (ctx->audio_pts_source == PTS_SRC_ABS_WALLCLOCK || ctx->video_pts_source == PTS_SRC_ABS_WALLCLOCK)
         abs_wallclock = av_gettime();

 
     // Handle Video Frame
     if (videoFrame) {
         AVPacket pkt;
         av_init_packet(&pkt);
         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) {

             if (ctx->draw_bars && videoFrame->GetPixelFormat() == bmdFormat8BitYUV) {

                 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 = get_pkt_pts(videoFrame, audioFrame, wallclock, abs_wallclock, ctx->video_pts_source, ctx->video_st->time_base, &initial_video_pts, cctx->copyts);

         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);

         if (!no_video) {

             IDeckLinkVideoFrameAncillary *vanc;
             AVPacket txt_pkt;

             uint8_t txt_buf0[3531]; // 35 * 46 bytes decoded teletext lines + 1 byte data_identifier + 1920 bytes OP47 decode buffer

             uint8_t *txt_buf = txt_buf0;
 
             if (videoFrame->GetAncillaryData(&vanc) == S_OK) {
                 int i;
                 int64_t line_mask = 1;

                 BMDPixelFormat vanc_format = vanc->GetPixelFormat();

                 txt_buf[0] = 0x10;    // data_identifier - EBU_data
                 txt_buf++;

 #if CONFIG_LIBZVBI

                 if (ctx->bmd_mode == bmdModePAL && ctx->teletext_lines &&
                     (vanc_format == bmdFormat8BitYUV || vanc_format == bmdFormat10BitYUV)) {

                     av_assert0(videoFrame->GetWidth() == 720);
                     for (i = 6; i < 336; i++, line_mask <<= 1) {
                         uint8_t *buf;
                         if ((ctx->teletext_lines & line_mask) && vanc->GetBufferForVerticalBlankingLine(i, (void**)&buf) == S_OK) {
                             if (vanc_format == bmdFormat8BitYUV)
                                 txt_buf = teletext_data_unit_from_vbi_data(i, buf, txt_buf, VBI_PIXFMT_UYVY);
                             else
                                 txt_buf = teletext_data_unit_from_vbi_data_10bit(i, buf, txt_buf);
                         }
                         if (i == 22)
                             i = 317;

                     }
                 }

 #endif

                 if (vanc_format == bmdFormat10BitYUV && videoFrame->GetWidth() <= MAX_WIDTH_VANC) {

                     int idx = get_vanc_line_idx(ctx->bmd_mode);
                     for (i = vanc_line_numbers[idx].vanc_start; i <= vanc_line_numbers[idx].vanc_end; i++) {

                         uint8_t *buf;

                         if (vanc->GetBufferForVerticalBlankingLine(i, (void**)&buf) == S_OK) {

                             uint16_t vanc[MAX_WIDTH_VANC];
                             size_t vanc_size = videoFrame->GetWidth();
                             if (ctx->bmd_mode == bmdModeNTSC && videoFrame->GetWidth() * 2 <= MAX_WIDTH_VANC) {
                                 vanc_size = vanc_size * 2;
                                 unpack_v210(vanc, buf, videoFrame->GetWidth());
                             } else {
                                 extract_luma_from_v210(vanc, buf, videoFrame->GetWidth());
                             }
                             txt_buf = get_metadata(avctx, vanc, vanc_size,

                                                    txt_buf, sizeof(txt_buf0) - (txt_buf - txt_buf0), &pkt);

                         }

                         if (i == vanc_line_numbers[idx].field0_vanc_end)
                             i = vanc_line_numbers[idx].field1_vanc_start - 1;

                     }
                 }

                 vanc->Release();
                 if (txt_buf - txt_buf0 > 1) {
                     int stuffing_units = (4 - ((45 + txt_buf - txt_buf0) / 46) % 4) % 4;
                     while (stuffing_units--) {
                         memset(txt_buf, 0xff, 46);
                         txt_buf[1] = 0x2c; // data_unit_length
                         txt_buf += 46;
                     }
                     av_init_packet(&txt_pkt);
                     txt_pkt.pts = pkt.pts;
                     txt_pkt.dts = pkt.dts;
                     txt_pkt.stream_index = ctx->teletext_st->index;
                     txt_pkt.data = txt_buf0;
                     txt_pkt.size = txt_buf - txt_buf0;
                     if (avpacket_queue_put(&ctx->queue, &txt_pkt) < 0) {
                         ++ctx->dropped;
                     }
                 }
             }
         }
 

         if (avpacket_queue_put(&ctx->queue, &pkt) < 0) {
             ++ctx->dropped;
         }
     }
 
     // Handle Audio Frame
     if (audioFrame) {
         AVPacket pkt;
         BMDTimeValue audio_pts;
         av_init_packet(&pkt);
 
         //hack among hacks

         pkt.size = audioFrame->GetSampleFrameCount() * ctx->audio_st->codecpar->channels * (ctx->audio_depth / 8);

         audioFrame->GetBytes(&audioFrameBytes);
         audioFrame->GetPacketTime(&audio_pts, ctx->audio_st->time_base.den);

         pkt.pts = get_pkt_pts(videoFrame, audioFrame, wallclock, abs_wallclock, ctx->audio_pts_source, ctx->audio_st->time_base, &initial_audio_pts, cctx->copyts);

         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;
 
         if (avpacket_queue_put(&ctx->queue, &pkt) < 0) {
             ++ctx->dropped;
         }
     }
 
     return S_OK;
 }
 
 HRESULT decklink_input_callback::VideoInputFormatChanged(
     BMDVideoInputFormatChangedEvents events, IDeckLinkDisplayMode *mode,
     BMDDetectedVideoInputFormatFlags)
 {

     ctx->bmd_mode = mode->GetDisplayMode();

     return S_OK;
 }
 

 static int decklink_autodetect(struct decklink_cctx *cctx) {

     struct decklink_ctx *ctx = (struct decklink_ctx *)cctx->ctx;

     DECKLINK_BOOL autodetect_supported = false;
     int i;
 
     if (ctx->attr->GetFlag(BMDDeckLinkSupportsInputFormatDetection, &autodetect_supported) != S_OK)
         return -1;
     if (autodetect_supported == false)
         return -1;
 
     ctx->autodetect = 1;
     ctx->bmd_mode  = bmdModeUnknown;
     if (ctx->dli->EnableVideoInput(AUTODETECT_DEFAULT_MODE,
                                    bmdFormat8BitYUV,
                                    bmdVideoInputEnableFormatDetection) != S_OK) {
         return -1;
     }
 
     if (ctx->dli->StartStreams() != S_OK) {
         return -1;
     }
 
     // 1 second timeout
     for (i = 0; i < 10; i++) {
         av_usleep(100000);
         /* Sometimes VideoInputFrameArrived is called without the
          * bmdFrameHasNoInputSource flag before VideoInputFormatChanged.
          * So don't break for bmd_mode == AUTODETECT_DEFAULT_MODE. */
         if (ctx->bmd_mode != bmdModeUnknown &&
             ctx->bmd_mode != AUTODETECT_DEFAULT_MODE)
             break;
     }
 
     ctx->dli->PauseStreams();
     ctx->dli->FlushStreams();
     ctx->autodetect = 0;
     if (ctx->bmd_mode != bmdModeUnknown) {
         cctx->format_code = (char *)av_mallocz(5);
         if (!cctx->format_code)
             return -1;
         AV_WB32(cctx->format_code, ctx->bmd_mode);
         return 0;
     } else {
         return -1;
     }

 
 }
 
 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();
     }
 

     ff_decklink_cleanup(avctx);

     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;
     AVStream *st;
     HRESULT result;
     char fname[1024];
     char *tmp;
     int mode_num = 0;

     int ret;

 
     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->teletext_lines = cctx->teletext_lines;

     ctx->preroll      = cctx->preroll;

     ctx->duplex_mode  = cctx->duplex_mode;

     if (cctx->video_input > 0 && (unsigned int)cctx->video_input < FF_ARRAY_ELEMS(decklink_video_connection_map))
         ctx->video_input = decklink_video_connection_map[cctx->video_input];
     if (cctx->audio_input > 0 && (unsigned int)cctx->audio_input < FF_ARRAY_ELEMS(decklink_audio_connection_map))
         ctx->audio_input = decklink_audio_connection_map[cctx->audio_input];

     ctx->audio_pts_source = cctx->audio_pts_source;
     ctx->video_pts_source = cctx->video_pts_source;

     ctx->draw_bars = cctx->draw_bars;

     ctx->audio_depth = cctx->audio_depth;

     cctx->ctx = ctx;
 

     /* Check audio channel option for valid values: 2, 8 or 16 */
     switch (cctx->audio_channels) {
         case 2:
         case 8:
         case 16:
             break;
         default:
             av_log(avctx, AV_LOG_ERROR, "Value of channels option must be one of 2, 8 or 16\n");
             return AVERROR(EINVAL);
     }
 

     /* Check audio bit depth option for valid values: 16 or 32 */
     switch (cctx->audio_depth) {
         case 16:
         case 32:
             break;
         default:
             av_log(avctx, AV_LOG_ERROR, "Value for audio bit depth option must be either 16 or 32\n");
             return AVERROR(EINVAL);
     }
 

     /* List available devices. */
     if (ctx->list_devices) {

         ff_decklink_list_devices_legacy(avctx, 1, 0);

         return AVERROR_EXIT;
     }
 

     if (cctx->v210) {
         av_log(avctx, AV_LOG_WARNING, "The bm_v210 option is deprecated and will be removed. Please use the -raw_format yuv422p10.\n");
         cctx->raw_format = MKBETAG('v','2','1','0');
     }
 

     av_strlcpy(fname, avctx->url, sizeof(fname));

     tmp=strchr (fname, '@');
     if (tmp != NULL) {

         av_log(avctx, AV_LOG_WARNING, "The @mode syntax is deprecated and will be removed. Please use the -format_code option.\n");

         mode_num = atoi (tmp+1);
         *tmp = 0;
     }
 

     ret = ff_decklink_init_device(avctx, fname);
     if (ret < 0)
         return ret;

 
     /* Get input device. */
     if (ctx->dl->QueryInterface(IID_IDeckLinkInput, (void **) &ctx->dli) != S_OK) {

         av_log(avctx, AV_LOG_ERROR, "Could not open input device from '%s'\n",

                avctx->url);

         ret = AVERROR(EIO);
         goto error;

     }
 
     /* List supported formats. */
     if (ctx->list_formats) {
         ff_decklink_list_formats(avctx, DIRECTION_IN);

         ret = AVERROR_EXIT;
         goto error;

     }
 

     if (ff_decklink_set_configs(avctx, DIRECTION_IN) < 0) {
         av_log(avctx, AV_LOG_ERROR, "Could not set input configuration\n");
         ret = AVERROR(EIO);
         goto error;
     }
 

     ctx->input_callback = new decklink_input_callback(avctx);
     ctx->dli->SetCallback(ctx->input_callback);
 
     if (mode_num == 0 && !cctx->format_code) {
         if (decklink_autodetect(cctx) < 0) {
             av_log(avctx, AV_LOG_ERROR, "Cannot Autodetect input stream or No signal\n");

             ret = AVERROR(EIO);

             goto error;
         }

         av_log(avctx, AV_LOG_INFO, "Autodetected the input mode\n");
     }
     if (ff_decklink_set_format(avctx, DIRECTION_IN, mode_num) < 0) {
         av_log(avctx, AV_LOG_ERROR, "Could not set mode number %d or format code %s for %s\n",
             mode_num, (cctx->format_code) ? cctx->format_code : "(unset)", fname);
         ret = AVERROR(EIO);
         goto error;

     }
 

 #if !CONFIG_LIBZVBI
     if (ctx->teletext_lines && ctx->bmd_mode == bmdModePAL) {
         av_log(avctx, AV_LOG_ERROR, "Libzvbi support is needed for capturing SD PAL teletext, please recompile FFmpeg.\n");
         ret = AVERROR(ENOSYS);
         goto error;
     }
 #endif
 

     /* Setup streams. */
     st = avformat_new_stream(avctx, NULL);
     if (!st) {
         av_log(avctx, AV_LOG_ERROR, "Cannot add stream\n");

         ret = AVERROR(ENOMEM);

         goto error;
     }

     st->codecpar->codec_type  = AVMEDIA_TYPE_AUDIO;

     st->codecpar->codec_id    = cctx->audio_depth == 32 ? AV_CODEC_ID_PCM_S32LE : AV_CODEC_ID_PCM_S16LE;

     st->codecpar->sample_rate = bmdAudioSampleRate48kHz;
     st->codecpar->channels    = cctx->audio_channels;

     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");

         ret = AVERROR(ENOMEM);

         goto error;
     }

     st->codecpar->codec_type  = AVMEDIA_TYPE_VIDEO;
     st->codecpar->width       = ctx->bmd_width;
     st->codecpar->height      = ctx->bmd_height;

     st->time_base.den      = ctx->bmd_tb_den;
     st->time_base.num      = ctx->bmd_tb_num;

     st->r_frame_rate       = av_make_q(st->time_base.den, st->time_base.num);

     switch((BMDPixelFormat)cctx->raw_format) {
     case bmdFormat8BitYUV:

         st->codecpar->codec_id    = AV_CODEC_ID_RAWVIDEO;
         st->codecpar->codec_tag   = MKTAG('U', 'Y', 'V', 'Y');

         st->codecpar->format      = AV_PIX_FMT_UYVY422;

         st->codecpar->bit_rate    = av_rescale(ctx->bmd_width * ctx->bmd_height * 16, st->time_base.den, st->time_base.num);

         break;
     case bmdFormat10BitYUV:
         st->codecpar->codec_id    = AV_CODEC_ID_V210;
         st->codecpar->codec_tag   = MKTAG('V','2','1','0');
         st->codecpar->bit_rate    = av_rescale(ctx->bmd_width * ctx->bmd_height * 64, st->time_base.den, st->time_base.num * 3);
         st->codecpar->bits_per_coded_sample = 10;
         break;
     case bmdFormat8BitARGB:
         st->codecpar->codec_id    = AV_CODEC_ID_RAWVIDEO;

         st->codecpar->codec_tag   = avcodec_pix_fmt_to_codec_tag((enum AVPixelFormat)st->codecpar->format);

         st->codecpar->format      = AV_PIX_FMT_0RGB;

         st->codecpar->bit_rate    = av_rescale(ctx->bmd_width * ctx->bmd_height * 32, st->time_base.den, st->time_base.num);
         break;
     case bmdFormat8BitBGRA:
         st->codecpar->codec_id    = AV_CODEC_ID_RAWVIDEO;
         st->codecpar->codec_tag   = avcodec_pix_fmt_to_codec_tag((enum AVPixelFormat)st->codecpar->format);

         st->codecpar->format      = AV_PIX_FMT_BGR0;

         st->codecpar->bit_rate    = av_rescale(ctx->bmd_width * ctx->bmd_height * 32, st->time_base.den, st->time_base.num);
         break;
     case bmdFormat10BitRGB:
         st->codecpar->codec_id    = AV_CODEC_ID_R210;
         st->codecpar->codec_tag   = MKTAG('R','2','1','0');
         st->codecpar->format      = AV_PIX_FMT_RGB48LE;
         st->codecpar->bit_rate    = av_rescale(ctx->bmd_width * ctx->bmd_height * 30, st->time_base.den, st->time_base.num);
         st->codecpar->bits_per_coded_sample = 10;
         break;
     default:
         av_log(avctx, AV_LOG_ERROR, "Raw Format %.4s not supported\n", (char*) &cctx->raw_format);
         ret = AVERROR(EINVAL);
         goto error;

     }

     switch (ctx->bmd_field_dominance) {
     case bmdUpperFieldFirst:
         st->codecpar->field_order = AV_FIELD_TT;
         break;
     case bmdLowerFieldFirst:
         st->codecpar->field_order = AV_FIELD_BB;
         break;
     case bmdProgressiveFrame:
     case bmdProgressiveSegmentedFrame:
         st->codecpar->field_order = AV_FIELD_PROGRESSIVE;
         break;
     }
 

     avpriv_set_pts_info(st, 64, 1, 1000000);  /* 64 bits pts in us */
 
     ctx->video_st=st;
 

     if (ctx->teletext_lines) {
         st = avformat_new_stream(avctx, NULL);
         if (!st) {
             av_log(avctx, AV_LOG_ERROR, "Cannot add stream\n");

             ret = AVERROR(ENOMEM);

             goto error;
         }

         st->codecpar->codec_type  = AVMEDIA_TYPE_SUBTITLE;
         st->time_base.den         = ctx->bmd_tb_den;
         st->time_base.num         = ctx->bmd_tb_num;
         st->codecpar->codec_id    = AV_CODEC_ID_DVB_TELETEXT;

         avpriv_set_pts_info(st, 64, 1, 1000000);  /* 64 bits pts in us */
         ctx->teletext_st = st;
     }
 

     av_log(avctx, AV_LOG_VERBOSE, "Using %d input audio channels\n", ctx->audio_st->codecpar->channels);

     result = ctx->dli->EnableAudioInput(bmdAudioSampleRate48kHz, cctx->audio_depth == 32 ? bmdAudioSampleType32bitInteger : bmdAudioSampleType16bitInteger, ctx->audio_st->codecpar->channels);

 
     if (result != S_OK) {
         av_log(avctx, AV_LOG_ERROR, "Cannot enable audio input\n");

         ret = AVERROR(EIO);

         goto error;
     }
 

     result = ctx->dli->EnableVideoInput(ctx->bmd_mode,

                                         (BMDPixelFormat) cctx->raw_format,

                                         bmdVideoInputFlagDefault);

 
     if (result != S_OK) {
         av_log(avctx, AV_LOG_ERROR, "Cannot enable video input\n");

         ret = AVERROR(EIO);

         goto error;
     }
 
     avpacket_queue_init (avctx, &ctx->queue);
 

     if (ctx->dli->StartStreams() != S_OK) {

         av_log(avctx, AV_LOG_ERROR, "Cannot start input stream\n");

         ret = AVERROR(EIO);

         goto error;
     }
 
     return 0;
 
 error:

     ff_decklink_cleanup(avctx);

     return ret;

 }
 
 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;

 
     avpacket_queue_get(&ctx->queue, pkt, 1);
 
     return 0;
 }
 

 int ff_decklink_list_input_devices(AVFormatContext *avctx, struct AVDeviceInfoList *device_list)
 {
     return ff_decklink_list_devices(avctx, device_list, 1, 0);
 }
 

 } /* extern "C" */