dvenc.c 26.3 KB
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/*
 * DV encoder
 * Copyright (c) 2003 Roman Shaposhnik
 *
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 * This file is part of FFmpeg.
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 *
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 * FFmpeg is free software; you can redistribute it and/or
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 * 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.
 *
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 * FFmpeg is distributed in the hope that it will be useful,
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 * 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
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 * License along with FFmpeg; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

/**
 * @file
 * DV encoder
 */

#include "libavutil/attributes.h"
#include "libavutil/pixdesc.h"
#include "config.h"
#include "avcodec.h"
#include "internal.h"
#include "put_bits.h"
#include "dv.h"
#include "dv_tablegen.h"

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static av_cold int dvvideo_encode_init(AVCodecContext *avctx)
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{
    if (!avpriv_dv_codec_profile(avctx)) {
        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);
    }
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    if (avctx->height > 576) {
        av_log(avctx, AV_LOG_ERROR, "DVCPRO HD encoding is not supported.\n");
        return AVERROR_PATCHWELCOME;
    }
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    avctx->coded_frame = av_frame_alloc();
    if (!avctx->coded_frame)
        return AVERROR(ENOMEM);

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    dv_vlc_map_tableinit();

    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
/* Converts 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 = vlc & ((1 << size) - 1);
          }
          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, int linesize) {
    if (s->avctx->flags & 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, 242189, 257107, 237536, 229376, 200636, 242189, 223754,
 224969, 196781, 262144, 242189, 229376, 200636, 257107, 237536,
 211916, 185364, 235923, 217965, 229376, 211916, 206433, 180568,
 242189, 223754, 224969, 196781, 211916, 185364, 235923, 217965,
 200704, 175557, 222935, 205965, 200636, 185364, 195068, 170627,
 229376, 211916, 206433, 180568, 200704, 175557, 222935, 205965,
 175557, 153560, 188995, 174609, 165371, 144651, 200636, 185364,
 195068, 170627, 175557, 153560, 188995, 174609, 165371, 144651,
};

static av_always_inline int dv_init_enc_block(EncBlockInfo* bi, uint8_t *data, int 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
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       component is greater than 36. FFmpeg's DV encoder tracks AC bit
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       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};
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#else /* improved FFmpeg method */
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    static const int classes[] = {-1, -1, 255, 0xffff};
#endif
    int max  = classes[0];
    int prev = 0;

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    av_assert2((((int)blk) & 15) == 0);
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    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_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 + 15 > 30U) {
              bi->sign[i] = (level >> 31) & 1;
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              /* weight it and shift down into range, adding for rounding */
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              /* 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);
              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];
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                    av_assert2(b->next[prev] >= mb_area_start[a+1] || b->mb[prev]);
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                    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;
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                                av_assert2(a2 < 4);
                                av_assert2(b->mb[b->next[k]]);
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                                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]]);
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                                av_assert2(b->prev[a2] == k && (a2 + 1 >= 4 || b->prev[a2+1] != k));
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                                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, 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)) {
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            y_stride = s->frame->linesize[0] << 3;
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        } else {
            y_stride = 16;
        }
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        y_ptr    = s->frame->data[0] + ((mb_y * s->frame->linesize[0] + mb_x) << 3);
        linesize = s->frame->linesize[0];
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        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 */
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        c_offset = (((mb_y >>  (s->sys->pix_fmt == AV_PIX_FMT_YUV420P)) * s->frame->linesize[1] +
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                     (mb_x >> ((s->sys->pix_fmt == AV_PIX_FMT_YUV411P) ? 2 : 1))) << 3);
        for (j = 2; j; j--) {
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            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);
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            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);
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    int fs    = c->frame->top_field_first ? 0x00 : 0x40;
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    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 */
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                   fs       | /* first/second field flag 0 -- field 2, 1 -- field 1 */
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                   (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;

    s->sys = avpriv_dv_codec_profile(c);
    if (!s->sys || ff_dv_init_dynamic_tables(s->sys))
        return -1;
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    if ((ret = ff_alloc_packet2(c, pkt, s->sys->frame_size)) < 0)
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        return ret;

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    c->pix_fmt                = s->sys->pix_fmt;
    s->frame                  = frame;
    c->coded_frame->key_frame = 1;
    c->coded_frame->pict_type = AV_PICTURE_TYPE_I;
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    s->buf = pkt->data;
    c->execute(c, dv_encode_video_segment, s->sys->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;
}

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static int dvvideo_encode_close(AVCodecContext *avctx)
{
    av_frame_free(&avctx->coded_frame);
    return 0;
}

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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),
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    .init           = dvvideo_encode_init,
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    .encode2        = dvvideo_encode_frame,
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    .close          = dvvideo_encode_close,
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    .capabilities   = CODEC_CAP_SLICE_THREADS,
    .pix_fmts       = (const enum AVPixelFormat[]) {
        AV_PIX_FMT_YUV411P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV420P, AV_PIX_FMT_NONE
    },
};