dv: Split off DV video encoder into its own file

1 files changed, 698 insertions, 0 deletions

diff --git a/libavcodec/dvenc.c b/libavcodec/dvenc.c
new file mode 100644
index 0000000000..1e1fccfaa5
--- /dev/null
+++ b/libavcodec/dvenc.c
@@ -0,0 +1,698 @@
+/*
+ * DV encoder
+ * Copyright (c) 2003 Roman Shaposhnik
+ *
+ * This file is part of Libav.
+ *
+ * Libav 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.
+ *
+ * Libav 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 Libav; if not, write to the Free Software
+ * 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"
+
+static av_cold int dvvideo_init_encoder(AVCodecContext *avctx)
+{
+    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);
+    }
+
+    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
+       component is greater than 36. Libav'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 Libav method */
+    static const int classes[] = {-1, -1, 255, 0xffff};
+#endif
+    int max  = classes[0];
+    int prev = 0;
+
+    assert((((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_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;
+              /* weight it and 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);
+              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];
+                    assert(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;
+                                assert(a2 < 4);
+                                assert(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]]);
+                                assert(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, 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->picture.linesize[0] << 3;
+        } else {
+            y_stride = 16;
+        }
+        y_ptr    = s->picture.data[0] + ((mb_y * s->picture.linesize[0] + mb_x) << 3);
+        linesize = s->picture.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->picture.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->picture.data[j] + c_offset;
+            linesize = s->picture.linesize[j];
+            y_stride = (mb_y == 134) ? 8 : (s->picture.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);
+
+    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 */
+                   (1 << 6) | /* 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;
+
+    s->sys = avpriv_dv_codec_profile(c);
+    if (!s->sys || ff_dv_init_dynamic_tables(s->sys))
+        return -1;
+    if ((ret = ff_alloc_packet(pkt, s->sys->frame_size)) < 0) {
+        av_log(c, AV_LOG_ERROR, "Error getting output packet.\n");
+        return ret;
+    }
+
+    c->pix_fmt           = s->sys->pix_fmt;
+    s->picture           = *frame;
+    s->picture.key_frame = 1;
+    s->picture.pict_type = AV_PICTURE_TYPE_I;
+
+    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;
+}
+
+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_init_encoder,
+    .encode2        = dvvideo_encode_frame,
+    .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
+    },
+};