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FFmpeg/libavcodec/dvdec.c

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  1. /*

  2.  * DV decoder

  3.  * Copyright (c) 2002 Fabrice Bellard

  4.  * Copyright (c) 2004 Roman Shaposhnik

  5.  *

  6.  * 50 Mbps (DVCPRO50) support

  7.  * Copyright (c) 2006 Daniel Maas <dmaas@maasdigital.com>

  8.  *

  9.  * 100 Mbps (DVCPRO HD) support

  10.  * Initial code by Daniel Maas <dmaas@maasdigital.com> (funded by BBC R&D)

  11.  * Final code by Roman Shaposhnik

  12.  *

  13.  * Many thanks to Dan Dennedy <dan@dennedy.org> for providing wealth

  14.  * of DV technical info.

  15.  *

  16.  * This file is part of FFmpeg.

  17.  *

  18.  * FFmpeg is free software; you can redistribute it and/or

  19.  * modify it under the terms of the GNU Lesser General Public

  20.  * License as published by the Free Software Foundation; either

  21.  * version 2.1 of the License, or (at your option) any later version.

  22.  *

  23.  * FFmpeg is distributed in the hope that it will be useful,

  24.  * but WITHOUT ANY WARRANTY; without even the implied warranty of

  25.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

  26.  * Lesser General Public License for more details.

  27.  *

  28.  * You should have received a copy of the GNU Lesser General Public

  29.  * License along with FFmpeg; if not, write to the Free Software

  30.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

  31.  */

  32. 

  33. /**

  34.  * @file

  35.  * DV decoder

  36.  */

  37. 

  38. #include "libavutil/avassert.h"

  39. #include "libavutil/imgutils.h"

  40. #include "libavutil/internal.h"

  41. #include "libavutil/pixdesc.h"

  42. 

  43. #include "avcodec.h"

  44. #include "dv.h"

  45. #include "dv_profile_internal.h"

  46. #include "dvdata.h"

  47. #include "get_bits.h"

  48. #include "internal.h"

  49. #include "put_bits.h"

  50. #include "simple_idct.h"

  51. #include "thread.h"

  52. 

  53. typedef struct BlockInfo {

  54.     const uint32_t *factor_table;

  55.     const uint8_t *scan_table;

  56.     uint8_t pos; /* position in block */

  57.     void (*idct_put)(uint8_t *dest, ptrdiff_t stride, int16_t *block);

  58.     uint8_t partial_bit_count;

  59.     uint32_t partial_bit_buffer;

  60.     int shift_offset;

  61. } BlockInfo;

  62. 

  63. static const int dv_iweight_bits = 14;

  64. 

  65. static const uint16_t dv_iweight_88[64] = {

  66.     32768, 16705, 16705, 17734, 17032, 17734, 18205, 18081,

  67.     18081, 18205, 18725, 18562, 19195, 18562, 18725, 19266,

  68.     19091, 19705, 19705, 19091, 19266, 21407, 19643, 20267,

  69.     20228, 20267, 19643, 21407, 22725, 21826, 20853, 20806,

  70.     20806, 20853, 21826, 22725, 23170, 23170, 21407, 21400,

  71.     21407, 23170, 23170, 24598, 23786, 22018, 22018, 23786,

  72.     24598, 25251, 24465, 22654, 24465, 25251, 25972, 25172,

  73.     25172, 25972, 26722, 27969, 26722, 29692, 29692, 31521,

  74. };

  75. static const uint16_t dv_iweight_248[64] = {

  76.     32768, 16384, 16705, 16705, 17734, 17734, 17734, 17734,

  77.     18081, 18081, 18725, 18725, 21407, 21407, 19091, 19091,

  78.     19195, 19195, 18205, 18205, 18725, 18725, 19705, 19705,

  79.     20267, 20267, 21826, 21826, 23170, 23170, 20806, 20806,

  80.     20267, 20267, 19266, 19266, 21407, 21407, 20853, 20853,

  81.     21400, 21400, 23786, 23786, 24465, 24465, 22018, 22018,

  82.     23170, 23170, 22725, 22725, 24598, 24598, 24465, 24465,

  83.     25172, 25172, 27969, 27969, 25972, 25972, 29692, 29692

  84. };

  85. 

  86. /**

  87.  * The "inverse" DV100 weights are actually just the spec weights (zig-zagged).

  88.  */

  89. static const uint16_t dv_iweight_1080_y[64] = {

  90.     128,  16,  16,  17,  17,  17,  18,  18,

  91.      18,  18,  18,  18,  19,  18,  18,  19,

  92.      19,  19,  19,  19,  19,  42,  38,  40,

  93.      40,  40,  38,  42,  44,  43,  41,  41,

  94.      41,  41,  43,  44,  45,  45,  42,  42,

  95.      42,  45,  45,  48,  46,  43,  43,  46,

  96.      48,  49,  48,  44,  48,  49, 101,  98,

  97.      98, 101, 104, 109, 104, 116, 116, 123,

  98. };

  99. static const uint16_t dv_iweight_1080_c[64] = {

  100.     128,  16,  16,  17,  17,  17,  25,  25,

  101.      25,  25,  26,  25,  26,  25,  26,  26,

  102.      26,  27,  27,  26,  26,  42,  38,  40,

  103.      40,  40,  38,  42,  44,  43,  41,  41,

  104.      41,  41,  43,  44,  91,  91,  84,  84,

  105.      84,  91,  91,  96,  93,  86,  86,  93,

  106.      96, 197, 191, 177, 191, 197, 203, 197,

  107.     197, 203, 209, 219, 209, 232, 232, 246,

  108. };

  109. static const uint16_t dv_iweight_720_y[64] = {

  110.     128,  16,  16,  17,  17,  17,  18,  18,

  111.      18,  18,  18,  18,  19,  18,  18,  19,

  112.      19,  19,  19,  19,  19,  42,  38,  40,

  113.      40,  40,  38,  42,  44,  43,  41,  41,

  114.      41,  41,  43,  44,  68,  68,  63,  63,

  115.      63,  68,  68,  96,  92,  86,  86,  92,

  116.      96,  98,  96,  88,  96,  98, 202, 196,

  117.     196, 202, 208, 218, 208, 232, 232, 246,

  118. };

  119. static const uint16_t dv_iweight_720_c[64] = {

  120.     128,  24,  24,  26,  26,  26,  36,  36,

  121.      36,  36,  36,  36,  38,  36,  36,  38,

  122.      38,  38,  38,  38,  38,  84,  76,  80,

  123.      80,  80,  76,  84,  88,  86,  82,  82,

  124.      82,  82,  86,  88, 182, 182, 168, 168,

  125.     168, 182, 182, 192, 186, 192, 172, 186,

  126.     192, 394, 382, 354, 382, 394, 406, 394,

  127.     394, 406, 418, 438, 418, 464, 464, 492,

  128. };

  129. 

  130. static void dv_init_weight_tables(DVVideoContext *ctx, const AVDVProfile *d)

  131. {

  132.     int j, i, c, s;

  133.     uint32_t *factor1 = &ctx->idct_factor[0],

  134.              *factor2 = &ctx->idct_factor[DV_PROFILE_IS_HD(d) ? 4096 : 2816];

  135. 

  136.     if (DV_PROFILE_IS_HD(d)) {

  137.         /* quantization quanta by QNO for DV100 */

  138.         static const uint8_t dv100_qstep[16] = {

  139.             1, /* QNO = 0 and 1 both have no quantization */

  140.             1,

  141.             2, 3, 4, 5, 6, 7, 8, 16, 18, 20, 22, 24, 28, 52

  142.         };

  143.         const uint16_t *iweight1, *iweight2;

  144. 

  145.         if (d->height == 720) {

  146.             iweight1 = &dv_iweight_720_y[0];

  147.             iweight2 = &dv_iweight_720_c[0];

  148.         } else {

  149.             iweight1 = &dv_iweight_1080_y[0];

  150.             iweight2 = &dv_iweight_1080_c[0];

  151.         }

  152.         for (c = 0; c < 4; c++) {

  153.             for (s = 0; s < 16; s++) {

  154.                 for (i = 0; i < 64; i++) {

  155.                     *factor1++ = (dv100_qstep[s] << (c + 9)) * iweight1[i];

  156.                     *factor2++ = (dv100_qstep[s] << (c + 9)) * iweight2[i];

  157.                 }

  158.             }

  159.         }

  160.     } else {

  161.         static const uint8_t dv_quant_areas[4] = { 6, 21, 43, 64 };

  162.         const uint16_t *iweight1 = &dv_iweight_88[0];

  163.         for (j = 0; j < 2; j++, iweight1 = &dv_iweight_248[0]) {

  164.             for (s = 0; s < 22; s++) {

  165.                 for (i = c = 0; c < 4; c++) {

  166.                     for (; i < dv_quant_areas[c]; i++) {

  167.                         *factor1   = iweight1[i] << (ff_dv_quant_shifts[s][c] + 1);

  168.                         *factor2++ = (*factor1++) << 1;

  169.                     }

  170.                 }

  171.             }

  172.         }

  173.     }

  174. }

  175. 

  176. static av_cold int dvvideo_decode_init(AVCodecContext *avctx)

  177. {

  178.     DVVideoContext *s = avctx->priv_data;

  179.     int i;

  180. 

  181.     ff_idctdsp_init(&s->idsp, avctx);

  182. 

  183.     for (i = 0; i < 64; i++)

  184.         s->dv_zigzag[0][i] = s->idsp.idct_permutation[ff_zigzag_direct[i]];

  185. 

  186.     if (avctx->lowres){

  187.         for (i = 0; i < 64; i++){

  188.             int j = ff_dv_zigzag248_direct[i];

  189.             s->dv_zigzag[1][i] = s->idsp.idct_permutation[(j & 7) + (j & 8) * 4 + (j & 48) / 2];

  190.         }

  191.     }else

  192.         memcpy(s->dv_zigzag[1], ff_dv_zigzag248_direct, sizeof(s->dv_zigzag[1]));

  193. 

  194.     s->idct_put[0] = s->idsp.idct_put;

  195.     s->idct_put[1] = ff_simple_idct248_put;

  196. 

  197.     return ff_dvvideo_init(avctx);

  198. }

  199. 

  200. /* decode AC coefficients */

  201. static void dv_decode_ac(GetBitContext *gb, BlockInfo *mb, int16_t *block)

  202. {

  203.     int last_index = gb->size_in_bits;

  204.     const uint8_t  *scan_table   = mb->scan_table;

  205.     const uint32_t *factor_table = mb->factor_table;

  206.     int pos                      = mb->pos;

  207.     int partial_bit_count        = mb->partial_bit_count;

  208.     int level, run, vlc_len, index;

  209. 

  210.     OPEN_READER_NOSIZE(re, gb);

  211.     UPDATE_CACHE(re, gb);

  212. 

  213.     /* if we must parse a partial VLC, we do it here */

  214.     if (partial_bit_count > 0) {

  215.         re_cache              = re_cache >> partial_bit_count |

  216.                                 mb->partial_bit_buffer;

  217.         re_index             -= partial_bit_count;

  218.         mb->partial_bit_count = 0;

  219.     }

  220. 

  221.     /* get the AC coefficients until last_index is reached */

  222.     for (;;) {

  223.         ff_dlog(NULL, "%2d: bits=%04"PRIx32" index=%u\n",

  224.                 pos, SHOW_UBITS(re, gb, 16), re_index);

  225.         /* our own optimized GET_RL_VLC */

  226.         index   = NEG_USR32(re_cache, TEX_VLC_BITS);

  227.         vlc_len = ff_dv_rl_vlc[index].len;

  228.         if (vlc_len < 0) {

  229.             index = NEG_USR32((unsigned) re_cache << TEX_VLC_BITS, -vlc_len) +

  230.                     ff_dv_rl_vlc[index].level;

  231.             vlc_len = TEX_VLC_BITS - vlc_len;

  232.         }

  233.         level = ff_dv_rl_vlc[index].level;

  234.         run   = ff_dv_rl_vlc[index].run;

  235. 

  236.         /* gotta check if we're still within gb boundaries */

  237.         if (re_index + vlc_len > last_index) {

  238.             /* should be < 16 bits otherwise a codeword could have been parsed */

  239.             mb->partial_bit_count  = last_index - re_index;

  240.             mb->partial_bit_buffer = re_cache & ~(-1u >> mb->partial_bit_count);

  241.             re_index               = last_index;

  242.             break;

  243.         }

  244.         re_index += vlc_len;

  245. 

  246.         ff_dlog(NULL, "run=%d level=%d\n", run, level);

  247.         pos += run;

  248.         if (pos >= 64)

  249.             break;

  250. 

  251.         level = (level * factor_table[pos] + (1 << (dv_iweight_bits - 1))) >>

  252.                 dv_iweight_bits;

  253.         block[scan_table[pos]] = level;

  254. 

  255.         UPDATE_CACHE(re, gb);

  256.     }

  257.     CLOSE_READER(re, gb);

  258.     mb->pos = pos;

  259. }

  260. 

  261. static inline void bit_copy(PutBitContext *pb, GetBitContext *gb)

  262. {

  263.     int bits_left = get_bits_left(gb);

  264.     while (bits_left >= MIN_CACHE_BITS) {

  265.         put_bits(pb, MIN_CACHE_BITS, get_bits(gb, MIN_CACHE_BITS));

  266.         bits_left -= MIN_CACHE_BITS;

  267.     }

  268.     if (bits_left > 0)

  269.         put_bits(pb, bits_left, get_bits(gb, bits_left));

  270. }

  271. 

  272. static av_always_inline void put_block_8x4(int16_t *block, uint8_t *av_restrict p, int stride)

  273. {

  274.     int i, j;

  275. 

  276.     for (i = 0; i < 4; i++) {

  277.         for (j = 0; j < 8; j++)

  278.             p[j] = av_clip_uint8(block[j]);

  279.         block += 8;

  280.         p += stride;

  281.     }

  282. }

  283. 

  284. static void dv100_idct_put_last_row_field_chroma(DVVideoContext *s, uint8_t *data,

  285.                                                  int stride, int16_t *blocks)

  286. {

  287.     s->idsp.idct(blocks + 0*64);

  288.     s->idsp.idct(blocks + 1*64);

  289. 

  290.     put_block_8x4(blocks+0*64,       data,              stride<<1);

  291.     put_block_8x4(blocks+0*64 + 4*8, data + 8,          stride<<1);

  292.     put_block_8x4(blocks+1*64,       data + stride,     stride<<1);

  293.     put_block_8x4(blocks+1*64 + 4*8, data + 8 + stride, stride<<1);

  294. }

  295. 

  296. static void dv100_idct_put_last_row_field_luma(DVVideoContext *s, uint8_t *data,

  297.                                                int stride, int16_t *blocks)

  298. {

  299.     s->idsp.idct(blocks + 0*64);

  300.     s->idsp.idct(blocks + 1*64);

  301.     s->idsp.idct(blocks + 2*64);

  302.     s->idsp.idct(blocks + 3*64);

  303. 

  304.     put_block_8x4(blocks+0*64,       data,               stride<<1);

  305.     put_block_8x4(blocks+0*64 + 4*8, data + 16,          stride<<1);

  306.     put_block_8x4(blocks+1*64,       data + 8,           stride<<1);

  307.     put_block_8x4(blocks+1*64 + 4*8, data + 24,          stride<<1);

  308.     put_block_8x4(blocks+2*64,       data + stride,      stride<<1);

  309.     put_block_8x4(blocks+2*64 + 4*8, data + 16 + stride, stride<<1);

  310.     put_block_8x4(blocks+3*64,       data + 8  + stride, stride<<1);

  311.     put_block_8x4(blocks+3*64 + 4*8, data + 24 + stride, stride<<1);

  312. }

  313. 

  314. /* mb_x and mb_y are in units of 8 pixels */

  315. static int dv_decode_video_segment(AVCodecContext *avctx, void *arg)

  316. {

  317.     DVVideoContext *s = avctx->priv_data;

  318.     DVwork_chunk *work_chunk = arg;

  319.     int quant, dc, dct_mode, class1, j;

  320.     int mb_index, mb_x, mb_y, last_index;

  321.     int y_stride, linesize;

  322.     int16_t *block, *block1;

  323.     int c_offset;

  324.     uint8_t *y_ptr;

  325.     const uint8_t *buf_ptr;

  326.     PutBitContext pb, vs_pb;

  327.     GetBitContext gb;

  328.     BlockInfo mb_data[5 * DV_MAX_BPM], *mb, *mb1;

  329.     LOCAL_ALIGNED_16(int16_t, sblock, [5 * DV_MAX_BPM], [64]);

  330.     LOCAL_ALIGNED_16(uint8_t, mb_bit_buffer, [80     + AV_INPUT_BUFFER_PADDING_SIZE]); /* allow some slack */

  331.     LOCAL_ALIGNED_16(uint8_t, vs_bit_buffer, [80 * 5 + AV_INPUT_BUFFER_PADDING_SIZE]); /* allow some slack */

  332.     const int log2_blocksize = 3-s->avctx->lowres;

  333.     int is_field_mode[5];

  334.     int vs_bit_buffer_damaged = 0;

  335.     int mb_bit_buffer_damaged[5] = {0};

  336.     int retried = 0;

  337.     int sta;

  338. 

  339.     av_assert1((((int) mb_bit_buffer) & 7) == 0);

  340.     av_assert1((((int) vs_bit_buffer) & 7) == 0);

  341. 

  342. retry:

  343. 

  344.     memset(sblock, 0, 5 * DV_MAX_BPM * sizeof(*sblock));

  345. 

  346.     /* pass 1: read DC and AC coefficients in blocks */

  347.     buf_ptr = &s->buf[work_chunk->buf_offset * 80];

  348.     block1  = &sblock[0][0];

  349.     mb1     = mb_data;

  350.     init_put_bits(&vs_pb, vs_bit_buffer, 5 * 80);

  351.     for (mb_index = 0; mb_index < 5; mb_index++, mb1 += s->sys->bpm, block1 += s->sys->bpm * 64) {

  352.         /* skip header */

  353.         quant    = buf_ptr[3] & 0x0f;

  354.         if (avctx->error_concealment) {

  355.             if ((buf_ptr[3] >> 4) == 0x0E)

  356.                 vs_bit_buffer_damaged = 1;

  357.             if (!mb_index) {

  358.                 sta = buf_ptr[3] >> 4;

  359.             } else if (sta != (buf_ptr[3] >> 4))

  360.                 vs_bit_buffer_damaged = 1;

  361.         }

  362.         buf_ptr += 4;

  363.         init_put_bits(&pb, mb_bit_buffer, 80);

  364.         mb    = mb1;

  365.         block = block1;

  366.         is_field_mode[mb_index] = 0;

  367.         for (j = 0; j < s->sys->bpm; j++) {

  368.             last_index = s->sys->block_sizes[j];

  369.             init_get_bits(&gb, buf_ptr, last_index);

  370. 

  371.             /* get the DC */

  372.             dc       = get_sbits(&gb, 9);

  373.             dct_mode = get_bits1(&gb);

  374.             class1   = get_bits(&gb, 2);

  375.             if (DV_PROFILE_IS_HD(s->sys)) {

  376.                 mb->idct_put     = s->idct_put[0];

  377.                 mb->scan_table   = s->dv_zigzag[0];

  378.                 mb->factor_table = &s->idct_factor[(j >= 4) * 4 * 16 * 64 +

  379.                                                    class1       * 16 * 64 +

  380.                                                    quant             * 64];

  381.                 is_field_mode[mb_index] |= !j && dct_mode;

  382.             } else {

  383.                 mb->idct_put     = s->idct_put[dct_mode && log2_blocksize == 3];

  384.                 mb->scan_table   = s->dv_zigzag[dct_mode];

  385.                 mb->factor_table =

  386.                     &s->idct_factor[(class1 == 3)               * 2 * 22 * 64 +

  387.                                     dct_mode                        * 22 * 64 +

  388.                                     (quant + ff_dv_quant_offset[class1]) * 64];

  389.             }

  390.             dc = dc * 4;

  391.             /* convert to unsigned because 128 is not added in the

  392.              * standard IDCT */

  393.             dc                   += 1024;

  394.             block[0]              = dc;

  395.             buf_ptr              += last_index >> 3;

  396.             mb->pos               = 0;

  397.             mb->partial_bit_count = 0;

  398. 

  399.             ff_dlog(avctx, "MB block: %d, %d ", mb_index, j);

  400.             dv_decode_ac(&gb, mb, block);

  401. 

  402.             /* write the remaining bits in a new buffer only if the

  403.              * block is finished */

  404.             if (mb->pos >= 64)

  405.                 bit_copy(&pb, &gb);

  406.             if (mb->pos >= 64 && mb->pos < 127)

  407.                 vs_bit_buffer_damaged = mb_bit_buffer_damaged[mb_index] = 1;

  408. 

  409.             block += 64;

  410.             mb++;

  411.         }

  412. 

  413.         if (mb_bit_buffer_damaged[mb_index] > 0)

  414.             continue;

  415. 

  416.         /* pass 2: we can do it just after */

  417.         ff_dlog(avctx, "***pass 2 size=%d MB#=%d\n", put_bits_count(&pb), mb_index);

  418.         block = block1;

  419.         mb    = mb1;

  420.         init_get_bits(&gb, mb_bit_buffer, put_bits_count(&pb));

  421.         put_bits32(&pb, 0); // padding must be zeroed

  422.         flush_put_bits(&pb);

  423.         for (j = 0; j < s->sys->bpm; j++, block += 64, mb++) {

  424.             if (mb->pos < 64 && get_bits_left(&gb) > 0) {

  425.                 dv_decode_ac(&gb, mb, block);

  426.                 /* if still not finished, no need to parse other blocks */

  427.                 if (mb->pos < 64)

  428.                     break;

  429.                 if (mb->pos < 127)

  430.                     vs_bit_buffer_damaged = mb_bit_buffer_damaged[mb_index] = 1;

  431.             }

  432.         }

  433.         /* all blocks are finished, so the extra bytes can be used at

  434.          * the video segment level */

  435.         if (j >= s->sys->bpm)

  436.             bit_copy(&vs_pb, &gb);

  437.     }

  438. 

  439.     /* we need a pass over the whole video segment */

  440.     ff_dlog(avctx, "***pass 3 size=%d\n", put_bits_count(&vs_pb));

  441.     block = &sblock[0][0];

  442.     mb    = mb_data;

  443.     init_get_bits(&gb, vs_bit_buffer, put_bits_count(&vs_pb));

  444.     put_bits32(&vs_pb, 0); // padding must be zeroed

  445.     flush_put_bits(&vs_pb);

  446.     for (mb_index = 0; mb_index < 5; mb_index++) {

  447.         for (j = 0; j < s->sys->bpm; j++) {

  448.             if (mb->pos < 64 && get_bits_left(&gb) > 0 && !vs_bit_buffer_damaged) {

  449.                 ff_dlog(avctx, "start %d:%d\n", mb_index, j);

  450.                 dv_decode_ac(&gb, mb, block);

  451.             }

  452. 

  453.             if (mb->pos >= 64 && mb->pos < 127) {

  454.                 av_log(avctx, AV_LOG_ERROR,

  455.                        "AC EOB marker is absent pos=%d\n", mb->pos);

  456.                 vs_bit_buffer_damaged = 1;

  457.             }

  458.             block += 64;

  459.             mb++;

  460.         }

  461.     }

  462.     if (vs_bit_buffer_damaged && !retried) {

  463.         av_log(avctx, AV_LOG_ERROR, "Concealing bitstream errors\n");

  464.         retried = 1;

  465.         goto retry;

  466.     }

  467. 

  468.     /* compute idct and place blocks */

  469.     block = &sblock[0][0];

  470.     mb    = mb_data;

  471.     for (mb_index = 0; mb_index < 5; mb_index++) {

  472.         dv_calculate_mb_xy(s, work_chunk, mb_index, &mb_x, &mb_y);

  473. 

  474.         /* idct_put'ting luminance */

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

  476.             (s->sys->pix_fmt == AV_PIX_FMT_YUV411P && mb_x >= (704 / 8)) ||

  477.             (s->sys->height >= 720 && mb_y != 134)) {

  478.             y_stride = (s->frame->linesize[0] <<

  479.                         ((!is_field_mode[mb_index]) * log2_blocksize));

  480.         } else {

  481.             y_stride = (2 << log2_blocksize);

  482.         }

  483.         y_ptr    = s->frame->data[0] +

  484.                    ((mb_y * s->frame->linesize[0] + mb_x) << log2_blocksize);

  485.         if (mb_y == 134 && is_field_mode[mb_index]) {

  486.             dv100_idct_put_last_row_field_luma(s, y_ptr, s->frame->linesize[0], block);

  487.         } else {

  488.             linesize = s->frame->linesize[0] << is_field_mode[mb_index];

  489.             mb[0].idct_put(y_ptr, linesize, block + 0 * 64);

  490.             if (s->sys->video_stype == 4) { /* SD 422 */

  491.                 mb[2].idct_put(y_ptr + (1 << log2_blocksize),            linesize, block + 2 * 64);

  492.             } else {

  493.                 mb[1].idct_put(y_ptr + (1 << log2_blocksize),            linesize, block + 1 * 64);

  494.                 mb[2].idct_put(y_ptr                         + y_stride, linesize, block + 2 * 64);

  495.                 mb[3].idct_put(y_ptr + (1 << log2_blocksize) + y_stride, linesize, block + 3 * 64);

  496.             }

  497.         }

  498.         mb    += 4;

  499.         block += 4 * 64;

  500. 

  501.         /* idct_put'ting chrominance */

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

  503.                      (mb_x >> ((s->sys->pix_fmt == AV_PIX_FMT_YUV411P) ? 2 : 1))) << log2_blocksize);

  504.         for (j = 2; j; j--) {

  505.             uint8_t *c_ptr = s->frame->data[j] + c_offset;

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

  507.                 uint64_t aligned_pixels[64 / 8];

  508.                 uint8_t *pixels = (uint8_t *) aligned_pixels;

  509.                 uint8_t *c_ptr1, *ptr1;

  510.                 int x, y;

  511.                 mb->idct_put(pixels, 8, block);

  512.                 for (y = 0; y < (1 << log2_blocksize); y++, c_ptr += s->frame->linesize[j], pixels += 8) {

  513.                     ptr1   = pixels + ((1 << (log2_blocksize))>>1);

  514.                     c_ptr1 = c_ptr + (s->frame->linesize[j] << log2_blocksize);

  515.                     for (x = 0; x < (1 << FFMAX(log2_blocksize - 1, 0)); x++) {

  516.                         c_ptr[x]  = pixels[x];

  517.                         c_ptr1[x] = ptr1[x];

  518.                     }

  519.                 }

  520.                 block += 64;

  521.                 mb++;

  522.             } else {

  523.                 y_stride = (mb_y == 134) ? (1 << log2_blocksize) :

  524.                     s->frame->linesize[j] << ((!is_field_mode[mb_index]) * log2_blocksize);

  525.                 if (mb_y == 134 && is_field_mode[mb_index]) {

  526.                     dv100_idct_put_last_row_field_chroma(s, c_ptr, s->frame->linesize[j], block);

  527.                     mb += 2;

  528.                     block += 2*64;

  529.                 } else {

  530.                     linesize = s->frame->linesize[j] << is_field_mode[mb_index];

  531.                     (mb++)->idct_put(c_ptr, linesize, block);

  532.                     block += 64;

  533.                     if (s->sys->bpm == 8) {

  534.                         (mb++)->idct_put(c_ptr + y_stride, linesize, block);

  535.                         block += 64;

  536.                     }

  537.                 }

  538.             }

  539.         }

  540.     }

  541.     return 0;

  542. }

  543. 

  544. /* NOTE: exactly one frame must be given (120000 bytes for NTSC,

  545.  * 144000 bytes for PAL - or twice those for 50Mbps) */

  546. static int dvvideo_decode_frame(AVCodecContext *avctx, void *data,

  547.                                 int *got_frame, AVPacket *avpkt)

  548. {

  549.     uint8_t *buf = avpkt->data;

  550.     int buf_size = avpkt->size;

  551.     DVVideoContext *s = avctx->priv_data;

  552.     ThreadFrame frame = { .f = data };

  553.     const uint8_t *vsc_pack;

  554.     int apt, is16_9, ret;

  555.     const AVDVProfile *sys;

  556. 

  557.     sys = ff_dv_frame_profile(avctx, s->sys, buf, buf_size);

  558.     if (!sys || buf_size < sys->frame_size) {

  559.         av_log(avctx, AV_LOG_ERROR, "could not find dv frame profile\n");

  560.         return -1; /* NOTE: we only accept several full frames */

  561.     }

  562. 

  563.     if (sys != s->sys) {

  564.         ret = ff_dv_init_dynamic_tables(s, sys);

  565.         if (ret < 0) {

  566.             av_log(avctx, AV_LOG_ERROR, "Error initializing the work tables.\n");

  567.             return ret;

  568.         }

  569.         dv_init_weight_tables(s, sys);

  570.         s->sys = sys;

  571.     }

  572. 

  573.     s->frame            = frame.f;

  574.     frame.f->key_frame  = 1;

  575.     frame.f->pict_type  = AV_PICTURE_TYPE_I;

  576.     avctx->pix_fmt      = s->sys->pix_fmt;

  577.     avctx->framerate    = av_inv_q(s->sys->time_base);

  578. 

  579.     ret = ff_set_dimensions(avctx, s->sys->width, s->sys->height);

  580.     if (ret < 0)

  581.         return ret;

  582. 

  583.     /* Determine the codec's sample_aspect ratio from the packet */

  584.     vsc_pack = buf + 80 * 5 + 48 + 5;

  585.     if (*vsc_pack == dv_video_control) {

  586.         apt    = buf[4] & 0x07;

  587.         is16_9 = (vsc_pack[2] & 0x07) == 0x02 ||

  588.                  (!apt && (vsc_pack[2] & 0x07) == 0x07);

  589.         ff_set_sar(avctx, s->sys->sar[is16_9]);

  590.     }

  591. 

  592.     if ((ret = ff_thread_get_buffer(avctx, &frame, 0)) < 0)

  593.         return ret;

  594. 

  595.     /* Determine the codec's field order from the packet */

  596.     if ( *vsc_pack == dv_video_control ) {

  597.         if (avctx->height == 720) {

  598.             frame.f->interlaced_frame = 0;

  599.             frame.f->top_field_first = 0;

  600.         } else if (avctx->height == 1080) {

  601.             frame.f->interlaced_frame = 1;

  602.             frame.f->top_field_first = (vsc_pack[3] & 0x40) == 0x40;

  603.         } else {

  604.             frame.f->interlaced_frame = (vsc_pack[3] & 0x10) == 0x10;

  605.             frame.f->top_field_first = !(vsc_pack[3] & 0x40);

  606.         }

  607.     }

  608. 

  609.     s->buf = buf;

  610.     avctx->execute(avctx, dv_decode_video_segment, s->work_chunks, NULL,

  611.                    dv_work_pool_size(s->sys), sizeof(DVwork_chunk));

  612. 

  613.     emms_c();

  614. 

  615.     /* return image */

  616.     *got_frame = 1;

  617. 

  618.     return s->sys->frame_size;

  619. }

  620. 

  621. AVCodec ff_dvvideo_decoder = {

  622.     .name           = "dvvideo",

  623.     .long_name      = NULL_IF_CONFIG_SMALL("DV (Digital Video)"),

  624.     .type           = AVMEDIA_TYPE_VIDEO,

  625.     .id             = AV_CODEC_ID_DVVIDEO,

  626.     .priv_data_size = sizeof(DVVideoContext),

  627.     .init           = dvvideo_decode_init,

  628.     .decode         = dvvideo_decode_frame,

  629.     .capabilities   = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_FRAME_THREADS | AV_CODEC_CAP_SLICE_THREADS,

  630.     .max_lowres     = 3,

  631. };