/*
  * DV encoder
  * Copyright (c) 2003 Roman Shaposhnik
  *

  * 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

  *
  * quant_deadzone code and fixes sponsored by NOA GmbH

  */
 
 /**
  * @file
  * DV encoder
  */
 

 #include "config.h"
 

 #include "libavutil/attributes.h"

 #include "libavutil/internal.h"

 #include "libavutil/opt.h"

 #include "libavutil/pixdesc.h"

 #include "avcodec.h"

 #include "dv.h"
 #include "dv_profile_internal.h"
 #include "dv_tablegen.h"

 #include "fdctdsp.h"

 #include "internal.h"

 #include "mathops.h"

 #include "me_cmp.h"

 #include "pixblockdsp.h"

 #include "put_bits.h"
 

 static av_cold int dvvideo_encode_init(AVCodecContext *avctx)

 {

     DVVideoContext *s = avctx->priv_data;

     FDCTDSPContext fdsp;

     MECmpContext mecc;

     PixblockDSPContext pdsp;

     int ret;
 

     s->sys = av_dv_codec_profile2(avctx->width, avctx->height, avctx->pix_fmt, avctx->time_base);

     if (!s->sys) {

         av_log(avctx, AV_LOG_ERROR, "Found no DV profile for %ix%i %s video. "

                                     "Valid DV profiles are:\n",

                avctx->width, avctx->height, av_get_pix_fmt_name(avctx->pix_fmt));
         ff_dv_print_profiles(avctx, AV_LOG_ERROR);
         return AVERROR(EINVAL);
     }

     if (avctx->height > 576) {
         av_log(avctx, AV_LOG_ERROR, "DVCPRO HD encoding is not supported.\n");
         return AVERROR_PATCHWELCOME;
     }

     ret = ff_dv_init_dynamic_tables(s, s->sys);

     if (ret < 0) {
         av_log(avctx, AV_LOG_ERROR, "Error initializing work tables.\n");
         return ret;
     }

 
     dv_vlc_map_tableinit();
 

     memset(&fdsp,0, sizeof(fdsp));

     memset(&mecc,0, sizeof(mecc));

     memset(&pdsp,0, sizeof(pdsp));

     ff_fdctdsp_init(&fdsp, avctx);

     ff_me_cmp_init(&mecc, avctx);

     ff_pixblockdsp_init(&pdsp, avctx);

     ff_set_cmp(&mecc, mecc.ildct_cmp, avctx->ildct_cmp);

     s->get_pixels = pdsp.get_pixels;

     s->ildct_cmp  = mecc.ildct_cmp[5];

     s->fdct[0]    = fdsp.fdct;
     s->fdct[1]    = fdsp.fdct248;

     return ff_dvvideo_init(avctx);
 }
 
 /* bit budget for AC only in 5 MBs */

 static const int vs_total_ac_bits = (100 * 4 + 68 * 2) * 5;

 static const int mb_area_start[5] = { 1, 6, 21, 43, 64 };
 
 #if CONFIG_SMALL

 /* Convert run and level (where level != 0) pair into VLC, returning bit size */
 static av_always_inline int dv_rl2vlc(int run, int level, int sign,
                                       uint32_t *vlc)

 {
     int size;
     if (run < DV_VLC_MAP_RUN_SIZE && level < DV_VLC_MAP_LEV_SIZE) {
         *vlc = dv_vlc_map[run][level].vlc | sign;
         size = dv_vlc_map[run][level].size;

     } else {

         if (level < DV_VLC_MAP_LEV_SIZE) {
             *vlc = dv_vlc_map[0][level].vlc | sign;
             size = dv_vlc_map[0][level].size;
         } else {
             *vlc = 0xfe00 | (level << 1) | sign;
             size = 16;
         }
         if (run) {

             *vlc |= ((run < 16) ? dv_vlc_map[run - 1][0].vlc :
                      (0x1f80 | (run - 1))) << size;
             size +=  (run < 16) ? dv_vlc_map[run - 1][0].size : 13;

         }
     }
 
     return size;
 }
 
 static av_always_inline int dv_rl2vlc_size(int run, int level)
 {
     int size;
 
     if (run < DV_VLC_MAP_RUN_SIZE && level < DV_VLC_MAP_LEV_SIZE) {
         size = dv_vlc_map[run][level].size;

     } else {

         size = (level < DV_VLC_MAP_LEV_SIZE) ? dv_vlc_map[0][level].size : 16;

         if (run)
             size += (run < 16) ? dv_vlc_map[run - 1][0].size : 13;

     }
     return size;
 }
 #else

 static av_always_inline int dv_rl2vlc(int run, int l, int sign, uint32_t *vlc)

 {
     *vlc = dv_vlc_map[run][l].vlc | sign;
     return dv_vlc_map[run][l].size;
 }
 
 static av_always_inline int dv_rl2vlc_size(int run, int l)
 {
     return dv_vlc_map[run][l].size;
 }
 #endif
 
 typedef struct EncBlockInfo {
     int      area_q[4];
     int      bit_size[4];
     int      prev[5];
     int      cur_ac;
     int      cno;
     int      dct_mode;
     int16_t  mb[64];
     uint8_t  next[64];
     uint8_t  sign[64];
     uint8_t  partial_bit_count;
     uint32_t partial_bit_buffer; /* we can't use uint16_t here */
 } EncBlockInfo;
 

 static av_always_inline PutBitContext *dv_encode_ac(EncBlockInfo *bi,
                                                     PutBitContext *pb_pool,
                                                     PutBitContext *pb_end)

 {
     int prev, bits_left;

     PutBitContext *pb = pb_pool;
     int size          = bi->partial_bit_count;
     uint32_t vlc      = bi->partial_bit_buffer;
 
     bi->partial_bit_count  =
     bi->partial_bit_buffer = 0;
     for (;;) {
         /* Find suitable storage space */
         for (; size > (bits_left = put_bits_left(pb)); pb++) {
             if (bits_left) {
                 size -= bits_left;
                 put_bits(pb, bits_left, vlc >> size);

                 vlc = av_mod_uintp2(vlc, size);

             }
             if (pb + 1 >= pb_end) {
                 bi->partial_bit_count  = size;
                 bi->partial_bit_buffer = vlc;
                 return pb;
             }
         }
 
         /* Store VLC */
         put_bits(pb, size, vlc);
 
         if (bi->cur_ac >= 64)
             break;
 
         /* Construct the next VLC */
         prev       = bi->cur_ac;
         bi->cur_ac = bi->next[prev];
         if (bi->cur_ac < 64) {
             size = dv_rl2vlc(bi->cur_ac - prev - 1, bi->mb[bi->cur_ac],
                              bi->sign[bi->cur_ac], &vlc);
         } else {
             size = 4;
             vlc  = 6; /* End Of Block stamp */
         }

     }
     return pb;
 }
 

 static av_always_inline int dv_guess_dct_mode(DVVideoContext *s, uint8_t *data,

                                               ptrdiff_t linesize)

 {

     if (s->avctx->flags & AV_CODEC_FLAG_INTERLACED_DCT) {

         int ps = s->ildct_cmp(NULL, data, NULL, linesize, 8) - 400;
         if (ps > 0) {

             int is = s->ildct_cmp(NULL, data,            NULL, linesize << 1, 4) +
                      s->ildct_cmp(NULL, data + linesize, NULL, linesize << 1, 4);

             return ps > is;
         }
     }
 
     return 0;
 }
 
 static const int dv_weight_bits = 18;
 static const int dv_weight_88[64] = {

     131072, 257107, 257107, 242189, 252167, 242189, 235923, 237536,
     237536, 235923, 229376, 231390, 223754, 231390, 229376, 222935,
     224969, 217965, 217965, 224969, 222935, 200636, 218652, 211916,
     212325, 211916, 218652, 200636, 188995, 196781, 205965, 206433,
     206433, 205965, 196781, 188995, 185364, 185364, 200636, 200704,
     200636, 185364, 185364, 174609, 180568, 195068, 195068, 180568,
     174609, 170091, 175557, 189591, 175557, 170091, 165371, 170627,
     170627, 165371, 160727, 153560, 160727, 144651, 144651, 136258,

 };
 static const int dv_weight_248[64] = {

     131072, 262144, 257107, 257107, 242189, 242189, 242189, 242189,
     237536, 237536, 229376, 229376, 200636, 200636, 224973, 224973,
     223754, 223754, 235923, 235923, 229376, 229376, 217965, 217965,
     211916, 211916, 196781, 196781, 185364, 185364, 206433, 206433,
     211916, 211916, 222935, 222935, 200636, 200636, 205964, 205964,
     200704, 200704, 180568, 180568, 175557, 175557, 195068, 195068,
     185364, 185364, 188995, 188995, 174606, 174606, 175557, 175557,
     170627, 170627, 153560, 153560, 165371, 165371, 144651, 144651,

 };
 

 static av_always_inline int dv_init_enc_block(EncBlockInfo *bi, uint8_t *data,

                                               ptrdiff_t linesize,
                                               DVVideoContext *s, int bias)

 {
     const int *weight;

     const uint8_t *zigzag_scan;

     LOCAL_ALIGNED_16(int16_t, blk, [64]);
     int i, area;
     /* We offer two different methods for class number assignment: the

      * method suggested in SMPTE 314M Table 22, and an improved
      * method. The SMPTE method is very conservative; it assigns class
      * 3 (i.e. severe quantization) to any block where the largest AC

      * component is greater than 36. FFmpeg's DV encoder tracks AC bit

      * consumption precisely, so there is no need to bias most blocks
      * towards strongly lossy compression. Instead, we assign class 2
      * to most blocks, and use class 3 only when strictly necessary
      * (for blocks whose largest AC component exceeds 255). */

 
 #if 0 /* SMPTE spec method */

     static const int classes[] = { 12, 24, 36, 0xffff };

 #else /* improved FFmpeg method */

     static const int classes[] = { -1, -1, 255, 0xffff };

 #endif
     int max  = classes[0];
     int prev = 0;

     const unsigned deadzone = s->quant_deadzone;
     const unsigned threshold = 2 * deadzone;

     av_assert2((((int) blk) & 15) == 0);

     bi->area_q[0]          =
     bi->area_q[1]          =
     bi->area_q[2]          =
     bi->area_q[3]          = 0;
     bi->partial_bit_count  = 0;

     bi->partial_bit_buffer = 0;

     bi->cur_ac             = 0;

     if (data) {
         bi->dct_mode = dv_guess_dct_mode(s, data, linesize);
         s->get_pixels(blk, data, linesize);
         s->fdct[bi->dct_mode](blk);
     } else {

         /* We rely on the fact that encoding all zeros leads to an immediate
          * EOB, which is precisely what the spec calls for in the "dummy"
          * blocks. */
         memset(blk, 0, 64 * sizeof(*blk));

         bi->dct_mode = 0;
     }
     bi->mb[0] = blk[0];
 

     zigzag_scan = bi->dct_mode ? ff_dv_zigzag248_direct : ff_zigzag_direct;

     weight      = bi->dct_mode ? dv_weight_248 : dv_weight_88;

 
     for (area = 0; area < 4; area++) {

         bi->prev[area]     = prev;
         bi->bit_size[area] = 1; // 4 areas 4 bits for EOB :)
         for (i = mb_area_start[area]; i < mb_area_start[area + 1]; i++) {
             int level = blk[zigzag_scan[i]];
 

             if (level + deadzone > threshold) {

                 bi->sign[i] = (level >> 31) & 1;

                 /* Weight it and shift down into range, adding for rounding.

                  * The extra division by a factor of 2^4 reverses the 8x
                  * expansion of the DCT AND the 2x doubling of the weights. */
                 level     = (FFABS(level) * weight[i] + (1 << (dv_weight_bits + 3))) >>
                             (dv_weight_bits + 4);

                 if (!level)
                     continue;

                 bi->mb[i] = level;
                 if (level > max)
                     max = level;
                 bi->bit_size[area] += dv_rl2vlc_size(i - prev - 1, level);
                 bi->next[prev]      = i;
                 prev                = i;
             }
         }

     }

     bi->next[prev] = i;
     for (bi->cno = 0; max > classes[bi->cno]; bi->cno++)
         ;

 
     bi->cno += bias;
 
     if (bi->cno >= 3) {
         bi->cno = 3;
         prev    = 0;
         i       = bi->next[prev];
         for (area = 0; area < 4; area++) {
             bi->prev[area]     = prev;
             bi->bit_size[area] = 1; // 4 areas 4 bits for EOB :)

             for (; i < mb_area_start[area + 1]; i = bi->next[i]) {

                 bi->mb[i] >>= 1;
 
                 if (bi->mb[i]) {
                     bi->bit_size[area] += dv_rl2vlc_size(i - prev - 1, bi->mb[i]);

                     bi->next[prev]      = i;
                     prev                = i;

                 }
             }
         }

         bi->next[prev] = i;

     }
 

     return bi->bit_size[0] + bi->bit_size[1] +
            bi->bit_size[2] + bi->bit_size[3];

 }
 

 static inline void dv_guess_qnos(EncBlockInfo *blks, int *qnos)

 {
     int size[5];
     int i, j, k, a, prev, a2;

     EncBlockInfo *b;

     size[0] =
     size[1] =
     size[2] =
     size[3] =
     size[4] = 1 << 24;

     do {

         b = blks;
         for (i = 0; i < 5; i++) {
             if (!qnos[i])
                 continue;
 
             qnos[i]--;
             size[i] = 0;
             for (j = 0; j < 6; j++, b++) {
                 for (a = 0; a < 4; a++) {
                     if (b->area_q[a] != ff_dv_quant_shifts[qnos[i] + ff_dv_quant_offset[b->cno]][a]) {
                         b->bit_size[a] = 1; // 4 areas 4 bits for EOB :)
                         b->area_q[a]++;
                         prev = b->prev[a];

                         av_assert2(b->next[prev] >= mb_area_start[a + 1] || b->mb[prev]);

                         for (k = b->next[prev]; k < mb_area_start[a + 1]; k = b->next[k]) {
                             b->mb[k] >>= 1;
                             if (b->mb[k]) {
                                 b->bit_size[a] += dv_rl2vlc_size(k - prev - 1, b->mb[k]);
                                 prev            = k;
                             } else {
                                 if (b->next[k] >= mb_area_start[a + 1] && b->next[k] < 64) {
                                     for (a2 = a + 1; b->next[k] >= mb_area_start[a2 + 1]; a2++)
                                         b->prev[a2] = prev;

                                     av_assert2(a2 < 4);
                                     av_assert2(b->mb[b->next[k]]);

                                     b->bit_size[a2] += dv_rl2vlc_size(b->next[k] - prev - 1, b->mb[b->next[k]]) -
                                                        dv_rl2vlc_size(b->next[k] - k    - 1, b->mb[b->next[k]]);

                                     av_assert2(b->prev[a2] == k && (a2 + 1 >= 4 || b->prev[a2 + 1] != k));

                                     b->prev[a2] = prev;

                                 }
                                 b->next[prev] = b->next[k];
                             }
                         }
                         b->prev[a + 1] = prev;

                     }

                     size[i] += b->bit_size[a];

                 }

             }
             if (vs_total_ac_bits >= size[0] + size[1] + size[2] + size[3] + size[4])

                 return;

         }
     } while (qnos[0] | qnos[1] | qnos[2] | qnos[3] | qnos[4]);

     for (a = 2; a == 2 || vs_total_ac_bits < size[0]; a += a) {
         b       = blks;
         size[0] = 5 * 6 * 4; // EOB
         for (j = 0; j < 6 * 5; j++, b++) {

             prev = b->prev[0];
             for (k = b->next[prev]; k < 64; k = b->next[k]) {

                 if (b->mb[k] < a && b->mb[k] > -a) {

                     b->next[prev] = b->next[k];

                 } else {

                     size[0] += dv_rl2vlc_size(k - prev - 1, b->mb[k]);

                     prev     = k;

                 }
             }
         }
     }
 }
 
 static int dv_encode_video_segment(AVCodecContext *avctx, void *arg)
 {
     DVVideoContext *s = avctx->priv_data;
     DVwork_chunk *work_chunk = arg;
     int mb_index, i, j;

     int mb_x, mb_y, c_offset;
     ptrdiff_t linesize, y_stride;

     uint8_t *y_ptr;
     uint8_t *dif;

     LOCAL_ALIGNED_8(uint8_t, scratch, [128]);

     EncBlockInfo enc_blks[5 * DV_MAX_BPM];
     PutBitContext pbs[5 * DV_MAX_BPM];
     PutBitContext *pb;
     EncBlockInfo *enc_blk;
     int vs_bit_size = 0;
     int qnos[5] = { 15, 15, 15, 15, 15 }; /* No quantization */
     int *qnosp = &qnos[0];
 
     dif     = &s->buf[work_chunk->buf_offset * 80];

     enc_blk = &enc_blks[0];
     for (mb_index = 0; mb_index < 5; mb_index++) {
         dv_calculate_mb_xy(s, work_chunk, mb_index, &mb_x, &mb_y);
 
         /* initializing luminance blocks */

         if ((s->sys->pix_fmt == AV_PIX_FMT_YUV420P)                      ||

             (s->sys->pix_fmt == AV_PIX_FMT_YUV411P && mb_x >= (704 / 8)) ||
             (s->sys->height >= 720 && mb_y != 134)) {

             y_stride = s->frame->linesize[0] << 3;

         } else {
             y_stride = 16;
         }

         y_ptr    = s->frame->data[0] +
                    ((mb_y * s->frame->linesize[0] + mb_x) << 3);

         linesize = s->frame->linesize[0];

 
         if (s->sys->video_stype == 4) { /* SD 422 */
             vs_bit_size +=

                 dv_init_enc_block(enc_blk + 0, y_ptr,                linesize, s, 0) +
                 dv_init_enc_block(enc_blk + 1, NULL,                 linesize, s, 0) +
                 dv_init_enc_block(enc_blk + 2, y_ptr + 8,            linesize, s, 0) +
                 dv_init_enc_block(enc_blk + 3, NULL,                 linesize, s, 0);

         } else {
             vs_bit_size +=

                 dv_init_enc_block(enc_blk + 0, y_ptr,                linesize, s, 0) +
                 dv_init_enc_block(enc_blk + 1, y_ptr + 8,            linesize, s, 0) +
                 dv_init_enc_block(enc_blk + 2, y_ptr +     y_stride, linesize, s, 0) +
                 dv_init_enc_block(enc_blk + 3, y_ptr + 8 + y_stride, linesize, s, 0);

         }
         enc_blk += 4;
 
         /* initializing chrominance blocks */

         c_offset = (((mb_y >>  (s->sys->pix_fmt == AV_PIX_FMT_YUV420P)) * s->frame->linesize[1] +

                      (mb_x >> ((s->sys->pix_fmt == AV_PIX_FMT_YUV411P) ? 2 : 1))) << 3);
         for (j = 2; j; j--) {

             uint8_t *c_ptr = s->frame->data[j] + c_offset;
             linesize = s->frame->linesize[j];
             y_stride = (mb_y == 134) ? 8 : (s->frame->linesize[j] << 3);

             if (s->sys->pix_fmt == AV_PIX_FMT_YUV411P && mb_x >= (704 / 8)) {

                 uint8_t *d;
                 uint8_t *b = scratch;

                 for (i = 0; i < 8; i++) {

                     d      = c_ptr + (linesize << 3);
                     b[0]   = c_ptr[0];
                     b[1]   = c_ptr[1];
                     b[2]   = c_ptr[2];
                     b[3]   = c_ptr[3];
                     b[4]   = d[0];
                     b[5]   = d[1];
                     b[6]   = d[2];
                     b[7]   = d[3];

                     c_ptr += linesize;

                     b     += 16;

                 }

                 c_ptr    = scratch;

                 linesize = 16;
             }
 

             vs_bit_size += dv_init_enc_block(enc_blk++, c_ptr, linesize, s, 1);
             if (s->sys->bpm == 8)
                 vs_bit_size += dv_init_enc_block(enc_blk++, c_ptr + y_stride,
                                                  linesize, s, 1);

         }
     }
 
     if (vs_total_ac_bits < vs_bit_size)
         dv_guess_qnos(&enc_blks[0], qnosp);
 
     /* DIF encoding process */

     for (j = 0; j < 5 * s->sys->bpm;) {

         int start_mb = j;
 
         dif[3] = *qnosp++;

         dif   += 4;

 
         /* First pass over individual cells only */

         for (i = 0; i < s->sys->bpm; i++, j++) {
             int sz = s->sys->block_sizes[i] >> 3;

 
             init_put_bits(&pbs[j], dif, sz);
             put_sbits(&pbs[j], 9, ((enc_blks[j].mb[0] >> 3) - 1024 + 2) >> 2);
             put_bits(&pbs[j], 1, enc_blks[j].dct_mode);
             put_bits(&pbs[j], 2, enc_blks[j].cno);
 

             dv_encode_ac(&enc_blks[j], &pbs[j], &pbs[j + 1]);

             dif += sz;
         }
 
         /* Second pass over each MB space */
         pb = &pbs[start_mb];

         for (i = 0; i < s->sys->bpm; i++)
             if (enc_blks[start_mb + i].partial_bit_count)
                 pb = dv_encode_ac(&enc_blks[start_mb + i], pb,
                                   &pbs[start_mb + s->sys->bpm]);

     }
 
     /* Third and final pass over the whole video segment space */
     pb = &pbs[0];

     for (j = 0; j < 5 * s->sys->bpm; j++) {
         if (enc_blks[j].partial_bit_count)
             pb = dv_encode_ac(&enc_blks[j], pb, &pbs[s->sys->bpm * 5]);
         if (enc_blks[j].partial_bit_count)

             av_log(avctx, AV_LOG_ERROR, "ac bitstream overflow\n");
     }
 

     for (j = 0; j < 5 * s->sys->bpm; j++) {
         int pos;
         int size = pbs[j].size_in_bits >> 3;
         flush_put_bits(&pbs[j]);
         pos = put_bits_count(&pbs[j]) >> 3;
         if (pos > size) {
             av_log(avctx, AV_LOG_ERROR,
                    "bitstream written beyond buffer size\n");
             return -1;
         }
         memset(pbs[j].buf + pos, 0xff, size - pos);

     }
 
     return 0;
 }
 
 static inline int dv_write_pack(enum dv_pack_type pack_id, DVVideoContext *c,

                                 uint8_t *buf)

 {
     /*
      * Here's what SMPTE314M says about these two:
      *    (page 6) APTn, AP1n, AP2n, AP3n: These data shall be identical
      *             as track application IDs (APTn = 001, AP1n =
      *             001, AP2n = 001, AP3n = 001), if the source signal
      *             comes from a digital VCR. If the signal source is
      *             unknown, all bits for these data shall be set to 1.
      *    (page 12) STYPE: STYPE defines a signal type of video signal
      *                     00000b = 4:1:1 compression
      *                     00100b = 4:2:2 compression
      *                     XXXXXX = Reserved
      * Now, I've got two problems with these statements:
      *   1. it looks like APT == 111b should be a safe bet, but it isn't.
      *      It seems that for PAL as defined in IEC 61834 we have to set
      *      APT to 000 and for SMPTE314M to 001.
      *   2. It is not at all clear what STYPE is used for 4:2:0 PAL
      *      compression scheme (if any).
      */

     int apt = (c->sys->pix_fmt == AV_PIX_FMT_YUV420P ? 0 : 1);

     int fs  = c->frame->top_field_first ? 0x00 : 0x40;

 
     uint8_t aspect = 0;

     if ((int) (av_q2d(c->avctx->sample_aspect_ratio) *
                c->avctx->width / c->avctx->height * 10) >= 17) /* 16:9 */

         aspect = 0x02;
 

     buf[0] = (uint8_t) pack_id;

     switch (pack_id) {
     case dv_header525: /* I can't imagine why these two weren't defined as real */
     case dv_header625: /* packs in SMPTE314M -- they definitely look like ones */

         buf[1] =  0xf8       | /* reserved -- always 1 */
                  (apt & 0x07); /* APT: Track application ID */
         buf[2] = (0    << 7) | /* TF1: audio data is 0 - valid; 1 - invalid */
                  (0x0f << 3) | /* reserved -- always 1 */
                  (apt & 0x07); /* AP1: Audio application ID */
         buf[3] = (0    << 7) | /* TF2: video data is 0 - valid; 1 - invalid */
                  (0x0f << 3) | /* reserved -- always 1 */
                  (apt & 0x07); /* AP2: Video application ID */
         buf[4] = (0    << 7) | /* TF3: subcode(SSYB) is 0 - valid; 1 - invalid */
                  (0x0f << 3) | /* reserved -- always 1 */
                  (apt & 0x07); /* AP3: Subcode application ID */
         break;

     case dv_video_source:

         buf[1] = 0xff;         /* reserved -- always 1 */
         buf[2] = (1 << 7) |    /* B/W: 0 - b/w, 1 - color */
                  (1 << 6) |    /* following CLF is valid - 0, invalid - 1 */
                  (3 << 4) |    /* CLF: color frames ID (see ITU-R BT.470-4) */
                  0xf;          /* reserved -- always 1 */
         buf[3] = (3 << 6)           | /* reserved -- always 1 */
                  (c->sys->dsf << 5) | /*  system: 60fields/50fields */
                  c->sys->video_stype; /* signal type video compression */
         buf[4] = 0xff;         /* VISC: 0xff -- no information */
         break;

     case dv_video_control:

         buf[1] = (0 << 6) |    /* Copy generation management (CGMS) 0 -- free */
                  0x3f;         /* reserved -- always 1 */
         buf[2] = 0xc8 |        /* reserved -- always b11001xxx */
                  aspect;
         buf[3] = (1 << 7) |    /* frame/field flag 1 -- frame, 0 -- field */

                  fs       |    /* first/second field flag 0 -- field 2, 1 -- field 1 */

                  (1 << 5) |    /* frame change flag 0 -- same picture as before, 1 -- different */
                  (1 << 4) |    /* 1 - interlaced, 0 - noninterlaced */
                  0xc;          /* reserved -- always b1100 */
         buf[4] = 0xff;         /* reserved -- always 1 */
         break;

     default:

         buf[1] =
         buf[2] =
         buf[3] =
         buf[4] = 0xff;

     }
     return 5;
 }
 
 static inline int dv_write_dif_id(enum dv_section_type t, uint8_t chan_num,
                                   uint8_t seq_num, uint8_t dif_num,

                                   uint8_t *buf)

 {

     buf[0] = (uint8_t) t;      /* Section type */

     buf[1] = (seq_num  << 4) | /* DIF seq number 0-9 for 525/60; 0-11 for 625/50 */
              (chan_num << 3) | /* FSC: for 50Mb/s 0 - first channel; 1 - second */
              7;                /* reserved -- always 1 */
     buf[2] = dif_num;          /* DIF block number Video: 0-134, Audio: 0-8 */
     return 3;
 }
 

 static inline int dv_write_ssyb_id(uint8_t syb_num, uint8_t fr, uint8_t *buf)

 {
     if (syb_num == 0 || syb_num == 6) {
         buf[0] = (fr << 7) | /* FR ID 1 - first half of each channel; 0 - second */
                  (0  << 4) | /* AP3 (Subcode application ID) */
                  0x0f;       /* reserved -- always 1 */

     } else if (syb_num == 11) {

         buf[0] = (fr << 7) | /* FR ID 1 - first half of each channel; 0 - second */
                  0x7f;       /* reserved -- always 1 */

     } else {

         buf[0] = (fr << 7) | /* FR ID 1 - first half of each channel; 0 - second */
                  (0  << 4) | /* APT (Track application ID) */
                  0x0f;       /* reserved -- always 1 */
     }
     buf[1] = 0xf0 |            /* reserved -- always 1 */
              (syb_num & 0x0f); /* SSYB number 0 - 11   */
     buf[2] = 0xff;             /* reserved -- always 1 */
     return 3;
 }
 

 static void dv_format_frame(DVVideoContext *c, uint8_t *buf)

 {
     int chan, i, j, k;
 
     for (chan = 0; chan < c->sys->n_difchan; chan++) {
         for (i = 0; i < c->sys->difseg_size; i++) {
             memset(buf, 0xff, 80 * 6); /* first 6 DIF blocks are for control data */
 
             /* DV header: 1DIF */
             buf += dv_write_dif_id(dv_sect_header, chan, i, 0, buf);

             buf += dv_write_pack((c->sys->dsf ? dv_header625 : dv_header525),
                                  c, buf);

             buf += 72; /* unused bytes */
 
             /* DV subcode: 2DIFs */
             for (j = 0; j < 2; j++) {
                 buf += dv_write_dif_id(dv_sect_subcode, chan, i, j, buf);
                 for (k = 0; k < 6; k++)

                     buf += dv_write_ssyb_id(k, (i < c->sys->difseg_size / 2), buf) + 5;

                 buf += 29; /* unused bytes */
             }
 
             /* DV VAUX: 3DIFS */
             for (j = 0; j < 3; j++) {
                 buf += dv_write_dif_id(dv_sect_vaux, chan, i, j, buf);
                 buf += dv_write_pack(dv_video_source,  c, buf);
                 buf += dv_write_pack(dv_video_control, c, buf);

                 buf += 7 * 5;

                 buf += dv_write_pack(dv_video_source,  c, buf);
                 buf += dv_write_pack(dv_video_control, c, buf);

                 buf += 4 * 5 + 2; /* unused bytes */

             }
 
             /* DV Audio/Video: 135 Video DIFs + 9 Audio DIFs */
             for (j = 0; j < 135; j++) {

                 if (j % 15 == 0) {

                     memset(buf, 0xff, 80);

                     buf += dv_write_dif_id(dv_sect_audio, chan, i, j / 15, buf);

                     buf += 77; /* audio control & shuffled PCM audio */
                 }
                 buf += dv_write_dif_id(dv_sect_video, chan, i, j, buf);
                 buf += 77; /* 1 video macroblock: 1 bytes control

                             * 4 * 14 bytes Y 8x8 data
                             * 10 bytes Cr 8x8 data
                             * 10 bytes Cb 8x8 data */

             }
         }
     }
 }
 
 static int dvvideo_encode_frame(AVCodecContext *c, AVPacket *pkt,
                                 const AVFrame *frame, int *got_packet)
 {
     DVVideoContext *s = c->priv_data;
     int ret;
 

     if ((ret = ff_alloc_packet2(c, pkt, s->sys->frame_size, 0)) < 0)

         return ret;
 

     c->pix_fmt                = s->sys->pix_fmt;
     s->frame                  = frame;

 #if FF_API_CODED_FRAME
 FF_DISABLE_DEPRECATION_WARNINGS

     c->coded_frame->key_frame = 1;
     c->coded_frame->pict_type = AV_PICTURE_TYPE_I;

 FF_ENABLE_DEPRECATION_WARNINGS
 #endif

 
     s->buf = pkt->data;

     c->execute(c, dv_encode_video_segment, s->work_chunks, NULL,

                dv_work_pool_size(s->sys), sizeof(DVwork_chunk));
 
     emms_c();
 
     dv_format_frame(s, pkt->data);
 
     pkt->flags |= AV_PKT_FLAG_KEY;
     *got_packet = 1;
 
     return 0;
 }
 

 #define VE AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_ENCODING_PARAM
 #define OFFSET(x) offsetof(DVVideoContext, x)
 static const AVOption dv_options[] = {

     { "quant_deadzone",        "Quantizer dead zone",    OFFSET(quant_deadzone),       AV_OPT_TYPE_INT, { .i64 = 7 }, 0, 1024, VE },

     { NULL },
 };
 
 static const AVClass dvvideo_encode_class = {
     .class_name = "dvvideo encoder",
     .item_name  = av_default_item_name,
     .option     = dv_options,
     .version    = LIBAVUTIL_VERSION_INT,
 };
 

 AVCodec ff_dvvideo_encoder = {
     .name           = "dvvideo",
     .long_name      = NULL_IF_CONFIG_SMALL("DV (Digital Video)"),
     .type           = AVMEDIA_TYPE_VIDEO,
     .id             = AV_CODEC_ID_DVVIDEO,
     .priv_data_size = sizeof(DVVideoContext),

     .init           = dvvideo_encode_init,

     .encode2        = dvvideo_encode_frame,

     .capabilities   = AV_CODEC_CAP_SLICE_THREADS | AV_CODEC_CAP_FRAME_THREADS | AV_CODEC_CAP_INTRA_ONLY,

     .pix_fmts       = (const enum AVPixelFormat[]) {

         AV_PIX_FMT_YUV411P, AV_PIX_FMT_YUV422P,
         AV_PIX_FMT_YUV420P, AV_PIX_FMT_NONE

     },

     .priv_class     = &dvvideo_encode_class,

 };