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FFmpeg/libavcodec/mpeg12enc.c

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  1. /*

  2.  * MPEG1/2 encoder

  3.  * Copyright (c) 2000,2001 Fabrice Bellard

  4.  * Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>

  5.  *

  6.  * This file is part of FFmpeg.

  7.  *

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

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

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

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

  12.  *

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

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

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

  16.  * Lesser General Public License for more details.

  17.  *

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

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

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

  21.  */

  22. 

  23. /**

  24.  * @file

  25.  * MPEG1/2 encoder

  26.  */

  27. 

  28. #include <stdint.h>

  29. 

  30. #include "libavutil/attributes.h"

  31. #include "libavutil/avassert.h"

  32. #include "libavutil/log.h"

  33. #include "libavutil/opt.h"

  34. #include "libavutil/timecode.h"

  35. #include "libavutil/stereo3d.h"

  36. 

  37. #include "avcodec.h"

  38. #include "bytestream.h"

  39. #include "mathops.h"

  40. #include "mpeg12.h"

  41. #include "mpeg12data.h"

  42. #include "mpegutils.h"

  43. #include "mpegvideo.h"

  44. 

  45. static const int8_t inv_non_linear_qscale[] = {

  46.     0, 2, 4, 6, 8, 9, 10, 11, 12, 13, 14, 15, 16,

  47.    -1,17,-1,18,-1,19, -1, 20, -1, 21, -1, 22, -1,

  48.    23,-1,24,-1,-1,-1

  49. };

  50. 

  51. static const uint8_t svcd_scan_offset_placeholder[] = {

  52.     0x10, 0x0E, 0x00, 0x80, 0x81, 0x00, 0x80,

  53.     0x81, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,

  54. };

  55. 

  56. static uint8_t mv_penalty[MAX_FCODE + 1][MAX_MV * 2 + 1];

  57. static uint8_t fcode_tab[MAX_MV * 2 + 1];

  58. 

  59. static uint8_t uni_mpeg1_ac_vlc_len[64 * 64 * 2];

  60. static uint8_t uni_mpeg2_ac_vlc_len[64 * 64 * 2];

  61. 

  62. /* simple include everything table for dc, first byte is bits

  63.  * number next 3 are code */

  64. static uint32_t mpeg1_lum_dc_uni[512];

  65. static uint32_t mpeg1_chr_dc_uni[512];

  66. 

  67. static uint8_t mpeg1_index_run[2][64];

  68. static int8_t  mpeg1_max_level[2][64];

  69. 

  70. static av_cold void init_uni_ac_vlc(RLTable *rl, uint8_t *uni_ac_vlc_len)

  71. {

  72.     int i;

  73. 

  74.     for (i = 0; i < 128; i++) {

  75.         int level = i - 64;

  76.         int run;

  77.         if (!level)

  78.             continue;

  79.         for (run = 0; run < 64; run++) {

  80.             int len, code;

  81.             int alevel = FFABS(level);

  82. 

  83.             if (alevel > rl->max_level[0][run])

  84.                 code = 111;                         /* rl->n */

  85.             else

  86.                 code = rl->index_run[0][run] + alevel - 1;

  87. 

  88.             if (code < 111) {                       /* rl->n */

  89.                 /* length of VLC and sign */

  90.                 len = rl->table_vlc[code][1] + 1;

  91.             } else {

  92.                 len = rl->table_vlc[111 /* rl->n */][1] + 6;

  93. 

  94.                 if (alevel < 128)

  95.                     len += 8;

  96.                 else

  97.                     len += 16;

  98.             }

  99. 

  100.             uni_ac_vlc_len[UNI_AC_ENC_INDEX(run, i)] = len;

  101.         }

  102.     }

  103. }

  104. 

  105. static int find_frame_rate_index(MpegEncContext *s)

  106. {

  107.     int i;

  108.     AVRational bestq = (AVRational) {0, 0};

  109.     AVRational ext;

  110.     AVRational target = av_inv_q(s->avctx->time_base);

  111. 

  112.     for (i = 1; i < 14; i++) {

  113.         if (s->avctx->strict_std_compliance > FF_COMPLIANCE_UNOFFICIAL &&

  114.             i >= 9)

  115.             break;

  116. 

  117.         for (ext.num=1; ext.num <= 4; ext.num++) {

  118.             for (ext.den=1; ext.den <= 32; ext.den++) {

  119.                 AVRational q = av_mul_q(ext, ff_mpeg12_frame_rate_tab[i]);

  120. 

  121.                 if (s->codec_id != AV_CODEC_ID_MPEG2VIDEO && (ext.den!=1 || ext.num!=1))

  122.                     continue;

  123.                 if (av_gcd(ext.den, ext.num) != 1)

  124.                     continue;

  125. 

  126.                 if (    bestq.num==0

  127.                     || av_nearer_q(target, bestq, q) < 0

  128.                     || ext.num==1 && ext.den==1 && av_nearer_q(target, bestq, q) == 0) {

  129.                     bestq               = q;

  130.                     s->frame_rate_index = i;

  131.                     s->mpeg2_frame_rate_ext.num = ext.num;

  132.                     s->mpeg2_frame_rate_ext.den = ext.den;

  133.                 }

  134.             }

  135.         }

  136.     }

  137. 

  138.     if (av_cmp_q(target, bestq))

  139.         return -1;

  140.     else

  141.         return 0;

  142. }

  143. 

  144. static av_cold int encode_init(AVCodecContext *avctx)

  145. {

  146.     MpegEncContext *s = avctx->priv_data;

  147. 

  148.     if (avctx->codec_id == AV_CODEC_ID_MPEG1VIDEO && avctx->height > 2800)

  149.         avctx->thread_count = 1;

  150. 

  151.     if (ff_mpv_encode_init(avctx) < 0)

  152.         return -1;

  153. 

  154.     if (find_frame_rate_index(s) < 0) {

  155.         if (s->strict_std_compliance > FF_COMPLIANCE_EXPERIMENTAL) {

  156.             av_log(avctx, AV_LOG_ERROR, "MPEG1/2 does not support %d/%d fps\n",

  157.                    avctx->time_base.den, avctx->time_base.num);

  158.             return -1;

  159.         } else {

  160.             av_log(avctx, AV_LOG_INFO,

  161.                    "MPEG1/2 does not support %d/%d fps, there may be AV sync issues\n",

  162.                    avctx->time_base.den, avctx->time_base.num);

  163.         }

  164.     }

  165. 

  166.     if (avctx->profile == FF_PROFILE_UNKNOWN) {

  167.         if (avctx->level != FF_LEVEL_UNKNOWN) {

  168.             av_log(avctx, AV_LOG_ERROR, "Set profile and level\n");

  169.             return -1;

  170.         }

  171.         /* Main or 4:2:2 */

  172.         avctx->profile = s->chroma_format == CHROMA_420 ? 4 : 0;

  173.     }

  174. 

  175.     if (avctx->level == FF_LEVEL_UNKNOWN) {

  176.         if (avctx->profile == 0) {                  /* 4:2:2 */

  177.             if (avctx->width <= 720 && avctx->height <= 608)

  178.                 avctx->level = 5;                   /* Main */

  179.             else

  180.                 avctx->level = 2;                   /* High */

  181.         } else {

  182.             if (avctx->profile != 1 && s->chroma_format != CHROMA_420) {

  183.                 av_log(avctx, AV_LOG_ERROR,

  184.                        "Only High(1) and 4:2:2(0) profiles support 4:2:2 color sampling\n");

  185.                 return -1;

  186.             }

  187.             if (avctx->width <= 720 && avctx->height <= 576)

  188.                 avctx->level = 8;                   /* Main */

  189.             else if (avctx->width <= 1440)

  190.                 avctx->level = 6;                   /* High 1440 */

  191.             else

  192.                 avctx->level = 4;                   /* High */

  193.         }

  194.     }

  195. 

  196.     if ((avctx->width & 0xFFF) == 0 && (avctx->height & 0xFFF) == 1) {

  197.         av_log(avctx, AV_LOG_ERROR, "Width / Height is invalid for MPEG2\n");

  198.         return AVERROR(EINVAL);

  199.     }

  200. 

  201.     if (s->strict_std_compliance > FF_COMPLIANCE_UNOFFICIAL) {

  202.         if ((avctx->width & 0xFFF) == 0 || (avctx->height & 0xFFF) == 0) {

  203.             av_log(avctx, AV_LOG_ERROR, "Width or Height are not allowed to be multiples of 4096\n"

  204.                                         "add '-strict %d' if you want to use them anyway.\n", FF_COMPLIANCE_UNOFFICIAL);

  205.             return AVERROR(EINVAL);

  206.         }

  207.     }

  208. 

  209.     s->drop_frame_timecode = s->drop_frame_timecode || !!(avctx->flags2 & AV_CODEC_FLAG2_DROP_FRAME_TIMECODE);

  210.     if (s->drop_frame_timecode)

  211.         s->tc.flags |= AV_TIMECODE_FLAG_DROPFRAME;

  212.     if (s->drop_frame_timecode && s->frame_rate_index != 4) {

  213.         av_log(avctx, AV_LOG_ERROR,

  214.                "Drop frame time code only allowed with 1001/30000 fps\n");

  215.         return -1;

  216.     }

  217. 

  218.     if (s->tc_opt_str) {

  219.         AVRational rate = ff_mpeg12_frame_rate_tab[s->frame_rate_index];

  220.         int ret = av_timecode_init_from_string(&s->tc, rate, s->tc_opt_str, s);

  221.         if (ret < 0)

  222.             return ret;

  223.         s->drop_frame_timecode = !!(s->tc.flags & AV_TIMECODE_FLAG_DROPFRAME);

  224.         s->avctx->timecode_frame_start = s->tc.start;

  225.     } else {

  226.         s->avctx->timecode_frame_start = 0; // default is -1

  227.     }

  228.     return 0;

  229. }

  230. 

  231. static void put_header(MpegEncContext *s, int header)

  232. {

  233.     avpriv_align_put_bits(&s->pb);

  234.     put_bits(&s->pb, 16, header >> 16);

  235.     put_sbits(&s->pb, 16, header);

  236. }

  237. 

  238. /* put sequence header if needed */

  239. static void mpeg1_encode_sequence_header(MpegEncContext *s)

  240. {

  241.     unsigned int vbv_buffer_size, fps, v;

  242.     int i, constraint_parameter_flag;

  243.     uint64_t time_code;

  244.     int64_t best_aspect_error = INT64_MAX;

  245.     AVRational aspect_ratio = s->avctx->sample_aspect_ratio;

  246. 

  247.     if (aspect_ratio.num == 0 || aspect_ratio.den == 0)

  248.         aspect_ratio = (AVRational){1,1};             // pixel aspect 1.1 (VGA)

  249. 

  250.     if (s->current_picture.f->key_frame) {

  251.         AVRational framerate = ff_mpeg12_frame_rate_tab[s->frame_rate_index];

  252. 

  253.         /* mpeg1 header repeated every gop */

  254.         put_header(s, SEQ_START_CODE);

  255. 

  256.         put_sbits(&s->pb, 12, s->width  & 0xFFF);

  257.         put_sbits(&s->pb, 12, s->height & 0xFFF);

  258. 

  259.         for (i = 1; i < 15; i++) {

  260.             int64_t error = aspect_ratio.num * (1LL<<32) / aspect_ratio.den;

  261.             if (s->codec_id == AV_CODEC_ID_MPEG1VIDEO || i <= 1)

  262.                 error -= (1LL<<32) / ff_mpeg1_aspect[i];

  263.             else

  264.                 error -= (1LL<<32)*ff_mpeg2_aspect[i].num * s->height / s->width / ff_mpeg2_aspect[i].den;

  265. 

  266.             error = FFABS(error);

  267. 

  268.             if (error - 2 <= best_aspect_error) {

  269.                 best_aspect_error    = error;

  270.                 s->aspect_ratio_info = i;

  271.             }

  272.         }

  273. 

  274.         put_bits(&s->pb, 4, s->aspect_ratio_info);

  275.         put_bits(&s->pb, 4, s->frame_rate_index);

  276. 

  277.         if (s->avctx->rc_max_rate) {

  278.             v = (s->avctx->rc_max_rate + 399) / 400;

  279.             if (v > 0x3ffff && s->codec_id == AV_CODEC_ID_MPEG1VIDEO)

  280.                 v = 0x3ffff;

  281.         } else {

  282.             v = 0x3FFFF;

  283.         }

  284. 

  285.         if (s->avctx->rc_buffer_size)

  286.             vbv_buffer_size = s->avctx->rc_buffer_size;

  287.         else

  288.             /* VBV calculation: Scaled so that a VCD has the proper

  289.              * VBV size of 40 kilobytes */

  290.             vbv_buffer_size = ((20 * s->bit_rate) / (1151929 / 2)) * 8 * 1024;

  291.         vbv_buffer_size = (vbv_buffer_size + 16383) / 16384;

  292. 

  293.         put_sbits(&s->pb, 18, v);

  294.         put_bits(&s->pb, 1, 1);         // marker

  295.         put_sbits(&s->pb, 10, vbv_buffer_size);

  296. 

  297.         constraint_parameter_flag =

  298.             s->width  <= 768                                    &&

  299.             s->height <= 576                                    &&

  300.             s->mb_width * s->mb_height                 <= 396   &&

  301.             s->mb_width * s->mb_height * framerate.num <= 396 * 25 * framerate.den &&

  302.             framerate.num <= framerate.den * 30                 &&

  303.             s->avctx->me_range                                  &&

  304.             s->avctx->me_range < 128                            &&

  305.             vbv_buffer_size <= 20                               &&

  306.             v <= 1856000 / 400                                  &&

  307.             s->codec_id == AV_CODEC_ID_MPEG1VIDEO;

  308. 

  309.         put_bits(&s->pb, 1, constraint_parameter_flag);

  310. 

  311.         ff_write_quant_matrix(&s->pb, s->avctx->intra_matrix);

  312.         ff_write_quant_matrix(&s->pb, s->avctx->inter_matrix);

  313. 

  314.         if (s->codec_id == AV_CODEC_ID_MPEG2VIDEO) {

  315.             AVFrameSideData *side_data;

  316.             int width = s->width;

  317.             int height = s->height;

  318.             int use_seq_disp_ext;

  319. 

  320.             put_header(s, EXT_START_CODE);

  321.             put_bits(&s->pb, 4, 1);                 // seq ext

  322. 

  323.             put_bits(&s->pb, 1, s->avctx->profile == 0); // escx 1 for 4:2:2 profile

  324. 

  325.             put_bits(&s->pb, 3, s->avctx->profile); // profile

  326.             put_bits(&s->pb, 4, s->avctx->level);   // level

  327. 

  328.             put_bits(&s->pb, 1, s->progressive_sequence);

  329.             put_bits(&s->pb, 2, s->chroma_format);

  330.             put_bits(&s->pb, 2, s->width  >> 12);

  331.             put_bits(&s->pb, 2, s->height >> 12);

  332.             put_bits(&s->pb, 12, v >> 18);          // bitrate ext

  333.             put_bits(&s->pb, 1, 1);                 // marker

  334.             put_bits(&s->pb, 8, vbv_buffer_size >> 10); // vbv buffer ext

  335.             put_bits(&s->pb, 1, s->low_delay);

  336.             put_bits(&s->pb, 2, s->mpeg2_frame_rate_ext.num-1); // frame_rate_ext_n

  337.             put_bits(&s->pb, 5, s->mpeg2_frame_rate_ext.den-1); // frame_rate_ext_d

  338. 

  339.             side_data = av_frame_get_side_data(s->current_picture_ptr->f, AV_FRAME_DATA_PANSCAN);

  340.             if (side_data) {

  341.                 AVPanScan *pan_scan = (AVPanScan *)side_data->data;

  342.                 if (pan_scan->width && pan_scan->height) {

  343.                     width = pan_scan->width >> 4;

  344.                     height = pan_scan->height >> 4;

  345.                 }

  346.             }

  347. 

  348.             use_seq_disp_ext = (width != s->width ||

  349.                                 height != s->height ||

  350.                                 s->avctx->color_primaries != AVCOL_PRI_UNSPECIFIED ||

  351.                                 s->avctx->color_trc != AVCOL_TRC_UNSPECIFIED ||

  352.                                 s->avctx->colorspace != AVCOL_SPC_UNSPECIFIED);

  353. 

  354.             if (s->seq_disp_ext == 1 || (s->seq_disp_ext == -1 && use_seq_disp_ext)) {

  355.                 put_header(s, EXT_START_CODE);

  356.                 put_bits(&s->pb, 4, 2);                         // sequence display extension

  357.                 put_bits(&s->pb, 3, 0);                         // video_format: 0 is components

  358.                 put_bits(&s->pb, 1, 1);                         // colour_description

  359.                 put_bits(&s->pb, 8, s->avctx->color_primaries); // colour_primaries

  360.                 put_bits(&s->pb, 8, s->avctx->color_trc);       // transfer_characteristics

  361.                 put_bits(&s->pb, 8, s->avctx->colorspace);      // matrix_coefficients

  362.                 put_bits(&s->pb, 14, width);                    // display_horizontal_size

  363.                 put_bits(&s->pb, 1, 1);                         // marker_bit

  364.                 put_bits(&s->pb, 14, height);                   // display_vertical_size

  365.                 put_bits(&s->pb, 3, 0);                         // remaining 3 bits are zero padding

  366.             }

  367.         }

  368. 

  369.         put_header(s, GOP_START_CODE);

  370.         put_bits(&s->pb, 1, s->drop_frame_timecode);    // drop frame flag

  371.         /* time code: we must convert from the real frame rate to a

  372.          * fake MPEG frame rate in case of low frame rate */

  373.         fps       = (framerate.num + framerate.den / 2) / framerate.den;

  374.         time_code = s->current_picture_ptr->f->coded_picture_number +

  375.                     s->avctx->timecode_frame_start;

  376. 

  377.         s->gop_picture_number = s->current_picture_ptr->f->coded_picture_number;

  378. 

  379.         av_assert0(s->drop_frame_timecode == !!(s->tc.flags & AV_TIMECODE_FLAG_DROPFRAME));

  380.         if (s->drop_frame_timecode)

  381.             time_code = av_timecode_adjust_ntsc_framenum2(time_code, fps);

  382. 

  383.         put_bits(&s->pb, 5, (uint32_t)((time_code / (fps * 3600)) % 24));

  384.         put_bits(&s->pb, 6, (uint32_t)((time_code / (fps *   60)) % 60));

  385.         put_bits(&s->pb, 1, 1);

  386.         put_bits(&s->pb, 6, (uint32_t)((time_code / fps) % 60));

  387.         put_bits(&s->pb, 6, (uint32_t)((time_code % fps)));

  388.         put_bits(&s->pb, 1, !!(s->avctx->flags & AV_CODEC_FLAG_CLOSED_GOP) || s->intra_only || !s->gop_picture_number);

  389.         put_bits(&s->pb, 1, 0);                     // broken link

  390.     }

  391. }

  392. 

  393. static inline void encode_mb_skip_run(MpegEncContext *s, int run)

  394. {

  395.     while (run >= 33) {

  396.         put_bits(&s->pb, 11, 0x008);

  397.         run -= 33;

  398.     }

  399.     put_bits(&s->pb, ff_mpeg12_mbAddrIncrTable[run][1],

  400.              ff_mpeg12_mbAddrIncrTable[run][0]);

  401. }

  402. 

  403. static av_always_inline void put_qscale(MpegEncContext *s)

  404. {

  405.     if (s->q_scale_type) {

  406.         int qp = inv_non_linear_qscale[s->qscale];

  407.         av_assert2(s->qscale >= 1 && qp > 0);

  408.         put_bits(&s->pb, 5, qp);

  409.     } else {

  410.         put_bits(&s->pb, 5, s->qscale);

  411.     }

  412. }

  413. 

  414. void ff_mpeg1_encode_slice_header(MpegEncContext *s)

  415. {

  416.     if (s->codec_id == AV_CODEC_ID_MPEG2VIDEO && s->height > 2800) {

  417.         put_header(s, SLICE_MIN_START_CODE + (s->mb_y & 127));

  418.         /* slice_vertical_position_extension */

  419.         put_bits(&s->pb, 3, s->mb_y >> 7);

  420.     } else {

  421.         put_header(s, SLICE_MIN_START_CODE + s->mb_y);

  422.     }

  423.     put_qscale(s);

  424.     /* slice extra information */

  425.     put_bits(&s->pb, 1, 0);

  426. }

  427. 

  428. void ff_mpeg1_encode_picture_header(MpegEncContext *s, int picture_number)

  429. {

  430.     AVFrameSideData *side_data;

  431.     mpeg1_encode_sequence_header(s);

  432. 

  433.     /* mpeg1 picture header */

  434.     put_header(s, PICTURE_START_CODE);

  435.     /* temporal reference */

  436. 

  437.     // RAL: s->picture_number instead of s->fake_picture_number

  438.     put_bits(&s->pb, 10,

  439.              (s->picture_number - s->gop_picture_number) & 0x3ff);

  440.     put_bits(&s->pb, 3, s->pict_type);

  441. 

  442.     s->vbv_delay_ptr = s->pb.buf + put_bits_count(&s->pb) / 8;

  443.     put_bits(&s->pb, 16, 0xFFFF);               /* vbv_delay */

  444. 

  445.     // RAL: Forward f_code also needed for B-frames

  446.     if (s->pict_type == AV_PICTURE_TYPE_P ||

  447.         s->pict_type == AV_PICTURE_TYPE_B) {

  448.         put_bits(&s->pb, 1, 0);                 /* half pel coordinates */

  449.         if (s->codec_id == AV_CODEC_ID_MPEG1VIDEO)

  450.             put_bits(&s->pb, 3, s->f_code);     /* forward_f_code */

  451.         else

  452.             put_bits(&s->pb, 3, 7);             /* forward_f_code */

  453.     }

  454. 

  455.     // RAL: Backward f_code necessary for B-frames

  456.     if (s->pict_type == AV_PICTURE_TYPE_B) {

  457.         put_bits(&s->pb, 1, 0);                 /* half pel coordinates */

  458.         if (s->codec_id == AV_CODEC_ID_MPEG1VIDEO)

  459.             put_bits(&s->pb, 3, s->b_code);     /* backward_f_code */

  460.         else

  461.             put_bits(&s->pb, 3, 7);             /* backward_f_code */

  462.     }

  463. 

  464.     put_bits(&s->pb, 1, 0);                     /* extra bit picture */

  465. 

  466.     s->frame_pred_frame_dct = 1;

  467.     if (s->codec_id == AV_CODEC_ID_MPEG2VIDEO) {

  468.         put_header(s, EXT_START_CODE);

  469.         put_bits(&s->pb, 4, 8);                 /* pic ext */

  470.         if (s->pict_type == AV_PICTURE_TYPE_P ||

  471.             s->pict_type == AV_PICTURE_TYPE_B) {

  472.             put_bits(&s->pb, 4, s->f_code);

  473.             put_bits(&s->pb, 4, s->f_code);

  474.         } else {

  475.             put_bits(&s->pb, 8, 255);

  476.         }

  477.         if (s->pict_type == AV_PICTURE_TYPE_B) {

  478.             put_bits(&s->pb, 4, s->b_code);

  479.             put_bits(&s->pb, 4, s->b_code);

  480.         } else {

  481.             put_bits(&s->pb, 8, 255);

  482.         }

  483.         put_bits(&s->pb, 2, s->intra_dc_precision);

  484. 

  485.         av_assert0(s->picture_structure == PICT_FRAME);

  486.         put_bits(&s->pb, 2, s->picture_structure);

  487.         if (s->progressive_sequence)

  488.             put_bits(&s->pb, 1, 0);             /* no repeat */

  489.         else

  490.             put_bits(&s->pb, 1, s->current_picture_ptr->f->top_field_first);

  491.         /* XXX: optimize the generation of this flag with entropy measures */

  492.         s->frame_pred_frame_dct = s->progressive_sequence;

  493. 

  494.         put_bits(&s->pb, 1, s->frame_pred_frame_dct);

  495.         put_bits(&s->pb, 1, s->concealment_motion_vectors);

  496.         put_bits(&s->pb, 1, s->q_scale_type);

  497.         put_bits(&s->pb, 1, s->intra_vlc_format);

  498.         put_bits(&s->pb, 1, s->alternate_scan);

  499.         put_bits(&s->pb, 1, s->repeat_first_field);

  500.         s->progressive_frame = s->progressive_sequence;

  501.         /* chroma_420_type */

  502.         put_bits(&s->pb, 1, s->chroma_format ==

  503.                             CHROMA_420 ? s->progressive_frame : 0);

  504.         put_bits(&s->pb, 1, s->progressive_frame);

  505.         put_bits(&s->pb, 1, 0);                 /* composite_display_flag */

  506.     }

  507.     if (s->scan_offset) {

  508.         int i;

  509. 

  510.         put_header(s, USER_START_CODE);

  511.         for (i = 0; i < sizeof(svcd_scan_offset_placeholder); i++)

  512.             put_bits(&s->pb, 8, svcd_scan_offset_placeholder[i]);

  513.     }

  514.     side_data = av_frame_get_side_data(s->current_picture_ptr->f,

  515.                                        AV_FRAME_DATA_STEREO3D);

  516.     if (side_data) {

  517.         AVStereo3D *stereo = (AVStereo3D *)side_data->data;

  518.         uint8_t fpa_type;

  519. 

  520.         switch (stereo->type) {

  521.         case AV_STEREO3D_SIDEBYSIDE:

  522.             fpa_type = 0x03;

  523.             break;

  524.         case AV_STEREO3D_TOPBOTTOM:

  525.             fpa_type = 0x04;

  526.             break;

  527.         case AV_STEREO3D_2D:

  528.             fpa_type = 0x08;

  529.             break;

  530.         case AV_STEREO3D_SIDEBYSIDE_QUINCUNX:

  531.             fpa_type = 0x23;

  532.             break;

  533.         default:

  534.             fpa_type = 0;

  535.             break;

  536.         }

  537. 

  538.         if (fpa_type != 0) {

  539.             put_header(s, USER_START_CODE);

  540.             put_bits(&s->pb, 8, 'J');   // S3D_video_format_signaling_identifier

  541.             put_bits(&s->pb, 8, 'P');

  542.             put_bits(&s->pb, 8, '3');

  543.             put_bits(&s->pb, 8, 'D');

  544.             put_bits(&s->pb, 8, 0x03);  // S3D_video_format_length

  545. 

  546.             put_bits(&s->pb, 1, 1);     // reserved_bit

  547.             put_bits(&s->pb, 7, fpa_type); // S3D_video_format_type

  548.             put_bits(&s->pb, 8, 0x04);  // reserved_data[0]

  549.             put_bits(&s->pb, 8, 0xFF);  // reserved_data[1]

  550.         }

  551.     }

  552. 

  553.     s->mb_y = 0;

  554.     ff_mpeg1_encode_slice_header(s);

  555. }

  556. 

  557. static inline void put_mb_modes(MpegEncContext *s, int n, int bits,

  558.                                 int has_mv, int field_motion)

  559. {

  560.     put_bits(&s->pb, n, bits);

  561.     if (!s->frame_pred_frame_dct) {

  562.         if (has_mv)

  563.             /* motion_type: frame/field */

  564.             put_bits(&s->pb, 2, 2 - field_motion);

  565.         put_bits(&s->pb, 1, s->interlaced_dct);

  566.     }

  567. }

  568. 

  569. // RAL: Parameter added: f_or_b_code

  570. static void mpeg1_encode_motion(MpegEncContext *s, int val, int f_or_b_code)

  571. {

  572.     if (val == 0) {

  573.         /* zero vector */

  574.         put_bits(&s->pb,

  575.                  ff_mpeg12_mbMotionVectorTable[0][1],

  576.                  ff_mpeg12_mbMotionVectorTable[0][0]);

  577.     } else {

  578.         int code, sign, bits;

  579.         int bit_size = f_or_b_code - 1;

  580.         int range    = 1 << bit_size;

  581.         /* modulo encoding */

  582.         val = sign_extend(val, 5 + bit_size);

  583. 

  584.         if (val >= 0) {

  585.             val--;

  586.             code = (val >> bit_size) + 1;

  587.             bits = val & (range - 1);

  588.             sign = 0;

  589.         } else {

  590.             val = -val;

  591.             val--;

  592.             code = (val >> bit_size) + 1;

  593.             bits = val & (range - 1);

  594.             sign = 1;

  595.         }

  596. 

  597.         av_assert2(code > 0 && code <= 16);

  598. 

  599.         put_bits(&s->pb,

  600.                  ff_mpeg12_mbMotionVectorTable[code][1],

  601.                  ff_mpeg12_mbMotionVectorTable[code][0]);

  602. 

  603.         put_bits(&s->pb, 1, sign);

  604.         if (bit_size > 0)

  605.             put_bits(&s->pb, bit_size, bits);

  606.     }

  607. }

  608. 

  609. static inline void encode_dc(MpegEncContext *s, int diff, int component)

  610. {

  611.     unsigned int diff_u = diff + 255;

  612.     if (diff_u >= 511) {

  613.         int index;

  614. 

  615.         if (diff < 0) {

  616.             index = av_log2_16bit(-2 * diff);

  617.             diff--;

  618.         } else {

  619.             index = av_log2_16bit(2 * diff);

  620.         }

  621.         if (component == 0)

  622.             put_bits(&s->pb,

  623.                      ff_mpeg12_vlc_dc_lum_bits[index] + index,

  624.                      (ff_mpeg12_vlc_dc_lum_code[index] << index) +

  625.                      av_mod_uintp2(diff, index));

  626.         else

  627.             put_bits(&s->pb,

  628.                      ff_mpeg12_vlc_dc_chroma_bits[index] + index,

  629.                      (ff_mpeg12_vlc_dc_chroma_code[index] << index) +

  630.                      av_mod_uintp2(diff, index));

  631.     } else {

  632.         if (component == 0)

  633.             put_bits(&s->pb,

  634.                      mpeg1_lum_dc_uni[diff + 255] & 0xFF,

  635.                      mpeg1_lum_dc_uni[diff + 255] >> 8);

  636.         else

  637.             put_bits(&s->pb,

  638.                      mpeg1_chr_dc_uni[diff + 255] & 0xFF,

  639.                      mpeg1_chr_dc_uni[diff + 255] >> 8);

  640.     }

  641. }

  642. 

  643. static void mpeg1_encode_block(MpegEncContext *s, int16_t *block, int n)

  644. {

  645.     int alevel, level, last_non_zero, dc, diff, i, j, run, last_index, sign;

  646.     int code, component;

  647.     const uint16_t (*table_vlc)[2] = ff_rl_mpeg1.table_vlc;

  648. 

  649.     last_index = s->block_last_index[n];

  650. 

  651.     /* DC coef */

  652.     if (s->mb_intra) {

  653.         component = (n <= 3 ? 0 : (n & 1) + 1);

  654.         dc        = block[0];                   /* overflow is impossible */

  655.         diff      = dc - s->last_dc[component];

  656.         encode_dc(s, diff, component);

  657.         s->last_dc[component] = dc;

  658.         i = 1;

  659.         if (s->intra_vlc_format)

  660.             table_vlc = ff_rl_mpeg2.table_vlc;

  661.     } else {

  662.         /* encode the first coefficient: needs to be done here because

  663.          * it is handled slightly differently */

  664.         level = block[0];

  665.         if (abs(level) == 1) {

  666.             code = ((uint32_t)level >> 31);     /* the sign bit */

  667.             put_bits(&s->pb, 2, code | 0x02);

  668.             i = 1;

  669.         } else {

  670.             i             = 0;

  671.             last_non_zero = -1;

  672.             goto next_coef;

  673.         }

  674.     }

  675. 

  676.     /* now quantify & encode AC coefs */

  677.     last_non_zero = i - 1;

  678. 

  679.     for (; i <= last_index; i++) {

  680.         j     = s->intra_scantable.permutated[i];

  681.         level = block[j];

  682. 

  683. next_coef:

  684.         /* encode using VLC */

  685.         if (level != 0) {

  686.             run = i - last_non_zero - 1;

  687. 

  688.             alevel = level;

  689.             MASK_ABS(sign, alevel);

  690.             sign &= 1;

  691. 

  692.             if (alevel <= mpeg1_max_level[0][run]) {

  693.                 code = mpeg1_index_run[0][run] + alevel - 1;

  694.                 /* store the VLC & sign at once */

  695.                 put_bits(&s->pb, table_vlc[code][1] + 1,

  696.                          (table_vlc[code][0] << 1) + sign);

  697.             } else {

  698.                 /* escape seems to be pretty rare <5% so I do not optimize it */

  699.                 put_bits(&s->pb, table_vlc[111][1], table_vlc[111][0]);

  700.                 /* escape: only clip in this case */

  701.                 put_bits(&s->pb, 6, run);

  702.                 if (s->codec_id == AV_CODEC_ID_MPEG1VIDEO) {

  703.                     if (alevel < 128) {

  704.                         put_sbits(&s->pb, 8, level);

  705.                     } else {

  706.                         if (level < 0)

  707.                             put_bits(&s->pb, 16, 0x8001 + level + 255);

  708.                         else

  709.                             put_sbits(&s->pb, 16, level);

  710.                     }

  711.                 } else {

  712.                     put_sbits(&s->pb, 12, level);

  713.                 }

  714.             }

  715.             last_non_zero = i;

  716.         }

  717.     }

  718.     /* end of block */

  719.     put_bits(&s->pb, table_vlc[112][1], table_vlc[112][0]);

  720. }

  721. 

  722. static av_always_inline void mpeg1_encode_mb_internal(MpegEncContext *s,

  723.                                                       int16_t block[8][64],

  724.                                                       int motion_x, int motion_y,

  725.                                                       int mb_block_count)

  726. {

  727.     int i, cbp;

  728.     const int mb_x     = s->mb_x;

  729.     const int mb_y     = s->mb_y;

  730.     const int first_mb = mb_x == s->resync_mb_x && mb_y == s->resync_mb_y;

  731. 

  732.     /* compute cbp */

  733.     cbp = 0;

  734.     for (i = 0; i < mb_block_count; i++)

  735.         if (s->block_last_index[i] >= 0)

  736.             cbp |= 1 << (mb_block_count - 1 - i);

  737. 

  738.     if (cbp == 0 && !first_mb && s->mv_type == MV_TYPE_16X16 &&

  739.         (mb_x != s->mb_width - 1 ||

  740.          (mb_y != s->end_mb_y - 1 && s->codec_id == AV_CODEC_ID_MPEG1VIDEO)) &&

  741.         ((s->pict_type == AV_PICTURE_TYPE_P && (motion_x | motion_y) == 0) ||

  742.          (s->pict_type == AV_PICTURE_TYPE_B && s->mv_dir == s->last_mv_dir &&

  743.           (((s->mv_dir & MV_DIR_FORWARD)

  744.             ? ((s->mv[0][0][0] - s->last_mv[0][0][0]) |

  745.                (s->mv[0][0][1] - s->last_mv[0][0][1])) : 0) |

  746.            ((s->mv_dir & MV_DIR_BACKWARD)

  747.             ? ((s->mv[1][0][0] - s->last_mv[1][0][0]) |

  748.                (s->mv[1][0][1] - s->last_mv[1][0][1])) : 0)) == 0))) {

  749.         s->mb_skip_run++;

  750.         s->qscale -= s->dquant;

  751.         s->skip_count++;

  752.         s->misc_bits++;

  753.         s->last_bits++;

  754.         if (s->pict_type == AV_PICTURE_TYPE_P) {

  755.             s->last_mv[0][0][0] =

  756.             s->last_mv[0][0][1] =

  757.             s->last_mv[0][1][0] =

  758.             s->last_mv[0][1][1] = 0;

  759.         }

  760.     } else {

  761.         if (first_mb) {

  762.             av_assert0(s->mb_skip_run == 0);

  763.             encode_mb_skip_run(s, s->mb_x);

  764.         } else {

  765.             encode_mb_skip_run(s, s->mb_skip_run);

  766.         }

  767. 

  768.         if (s->pict_type == AV_PICTURE_TYPE_I) {

  769.             if (s->dquant && cbp) {

  770.                 /* macroblock_type: macroblock_quant = 1 */

  771.                 put_mb_modes(s, 2, 1, 0, 0);

  772.                 put_qscale(s);

  773.             } else {

  774.                 /* macroblock_type: macroblock_quant = 0 */

  775.                 put_mb_modes(s, 1, 1, 0, 0);

  776.                 s->qscale -= s->dquant;

  777.             }

  778.             s->misc_bits += get_bits_diff(s);

  779.             s->i_count++;

  780.         } else if (s->mb_intra) {

  781.             if (s->dquant && cbp) {

  782.                 put_mb_modes(s, 6, 0x01, 0, 0);

  783.                 put_qscale(s);

  784.             } else {

  785.                 put_mb_modes(s, 5, 0x03, 0, 0);

  786.                 s->qscale -= s->dquant;

  787.             }

  788.             s->misc_bits += get_bits_diff(s);

  789.             s->i_count++;

  790.             memset(s->last_mv, 0, sizeof(s->last_mv));

  791.         } else if (s->pict_type == AV_PICTURE_TYPE_P) {

  792.             if (s->mv_type == MV_TYPE_16X16) {

  793.                 if (cbp != 0) {

  794.                     if ((motion_x | motion_y) == 0) {

  795.                         if (s->dquant) {

  796.                             /* macroblock_pattern & quant */

  797.                             put_mb_modes(s, 5, 1, 0, 0);

  798.                             put_qscale(s);

  799.                         } else {

  800.                             /* macroblock_pattern only */

  801.                             put_mb_modes(s, 2, 1, 0, 0);

  802.                         }

  803.                         s->misc_bits += get_bits_diff(s);

  804.                     } else {

  805.                         if (s->dquant) {

  806.                             put_mb_modes(s, 5, 2, 1, 0);    /* motion + cbp */

  807.                             put_qscale(s);

  808.                         } else {

  809.                             put_mb_modes(s, 1, 1, 1, 0);    /* motion + cbp */

  810.                         }

  811.                         s->misc_bits += get_bits_diff(s);

  812.                         // RAL: f_code parameter added

  813.                         mpeg1_encode_motion(s,

  814.                                             motion_x - s->last_mv[0][0][0],

  815.                                             s->f_code);

  816.                         // RAL: f_code parameter added

  817.                         mpeg1_encode_motion(s,

  818.                                             motion_y - s->last_mv[0][0][1],

  819.                                             s->f_code);

  820.                         s->mv_bits += get_bits_diff(s);

  821.                     }

  822.                 } else {

  823.                     put_bits(&s->pb, 3, 1);         /* motion only */

  824.                     if (!s->frame_pred_frame_dct)

  825.                         put_bits(&s->pb, 2, 2);     /* motion_type: frame */

  826.                     s->misc_bits += get_bits_diff(s);

  827.                     // RAL: f_code parameter added

  828.                     mpeg1_encode_motion(s,

  829.                                         motion_x - s->last_mv[0][0][0],

  830.                                         s->f_code);

  831.                     // RAL: f_code parameter added

  832.                     mpeg1_encode_motion(s,

  833.                                         motion_y - s->last_mv[0][0][1],

  834.                                         s->f_code);

  835.                     s->qscale  -= s->dquant;

  836.                     s->mv_bits += get_bits_diff(s);

  837.                 }

  838.                 s->last_mv[0][1][0] = s->last_mv[0][0][0] = motion_x;

  839.                 s->last_mv[0][1][1] = s->last_mv[0][0][1] = motion_y;

  840.             } else {

  841.                 av_assert2(!s->frame_pred_frame_dct && s->mv_type == MV_TYPE_FIELD);

  842. 

  843.                 if (cbp) {

  844.                     if (s->dquant) {

  845.                         put_mb_modes(s, 5, 2, 1, 1);    /* motion + cbp */

  846.                         put_qscale(s);

  847.                     } else {

  848.                         put_mb_modes(s, 1, 1, 1, 1);    /* motion + cbp */

  849.                     }

  850.                 } else {

  851.                     put_bits(&s->pb, 3, 1);             /* motion only */

  852.                     put_bits(&s->pb, 2, 1);             /* motion_type: field */

  853.                     s->qscale -= s->dquant;

  854.                 }

  855.                 s->misc_bits += get_bits_diff(s);

  856.                 for (i = 0; i < 2; i++) {

  857.                     put_bits(&s->pb, 1, s->field_select[0][i]);

  858.                     mpeg1_encode_motion(s,

  859.                                         s->mv[0][i][0] - s->last_mv[0][i][0],

  860.                                         s->f_code);

  861.                     mpeg1_encode_motion(s,

  862.                                         s->mv[0][i][1] - (s->last_mv[0][i][1] >> 1),

  863.                                         s->f_code);

  864.                     s->last_mv[0][i][0] = s->mv[0][i][0];

  865.                     s->last_mv[0][i][1] = 2 * s->mv[0][i][1];

  866.                 }

  867.                 s->mv_bits += get_bits_diff(s);

  868.             }

  869.             if (cbp) {

  870.                 if (s->chroma_y_shift) {

  871.                     put_bits(&s->pb,

  872.                              ff_mpeg12_mbPatTable[cbp][1],

  873.                              ff_mpeg12_mbPatTable[cbp][0]);

  874.                 } else {

  875.                     put_bits(&s->pb,

  876.                              ff_mpeg12_mbPatTable[cbp >> 2][1],

  877.                              ff_mpeg12_mbPatTable[cbp >> 2][0]);

  878.                     put_sbits(&s->pb, 2, cbp);

  879.                 }

  880.             }

  881.             s->f_count++;

  882.         } else {

  883.             if (s->mv_type == MV_TYPE_16X16) {

  884.                 if (cbp) {                      // With coded bloc pattern

  885.                     if (s->dquant) {

  886.                         if (s->mv_dir == MV_DIR_FORWARD)

  887.                             put_mb_modes(s, 6, 3, 1, 0);

  888.                         else

  889.                             put_mb_modes(s, 8 - s->mv_dir, 2, 1, 0);

  890.                         put_qscale(s);

  891.                     } else {

  892.                         put_mb_modes(s, 5 - s->mv_dir, 3, 1, 0);

  893.                     }

  894.                 } else {                        // No coded bloc pattern

  895.                     put_bits(&s->pb, 5 - s->mv_dir, 2);

  896.                     if (!s->frame_pred_frame_dct)

  897.                         put_bits(&s->pb, 2, 2); /* motion_type: frame */

  898.                     s->qscale -= s->dquant;

  899.                 }

  900.                 s->misc_bits += get_bits_diff(s);

  901.                 if (s->mv_dir & MV_DIR_FORWARD) {

  902.                     mpeg1_encode_motion(s,

  903.                                         s->mv[0][0][0] - s->last_mv[0][0][0],

  904.                                         s->f_code);

  905.                     mpeg1_encode_motion(s,

  906.                                         s->mv[0][0][1] - s->last_mv[0][0][1],

  907.                                         s->f_code);

  908.                     s->last_mv[0][0][0] =

  909.                     s->last_mv[0][1][0] = s->mv[0][0][0];

  910.                     s->last_mv[0][0][1] =

  911.                     s->last_mv[0][1][1] = s->mv[0][0][1];

  912.                     s->f_count++;

  913.                 }

  914.                 if (s->mv_dir & MV_DIR_BACKWARD) {

  915.                     mpeg1_encode_motion(s,

  916.                                         s->mv[1][0][0] - s->last_mv[1][0][0],

  917.                                         s->b_code);

  918.                     mpeg1_encode_motion(s,

  919.                                         s->mv[1][0][1] - s->last_mv[1][0][1],

  920.                                         s->b_code);

  921.                     s->last_mv[1][0][0] =

  922.                     s->last_mv[1][1][0] = s->mv[1][0][0];

  923.                     s->last_mv[1][0][1] =

  924.                     s->last_mv[1][1][1] = s->mv[1][0][1];

  925.                     s->b_count++;

  926.                 }

  927.             } else {

  928.                 av_assert2(s->mv_type == MV_TYPE_FIELD);

  929.                 av_assert2(!s->frame_pred_frame_dct);

  930.                 if (cbp) {                      // With coded bloc pattern

  931.                     if (s->dquant) {

  932.                         if (s->mv_dir == MV_DIR_FORWARD)

  933.                             put_mb_modes(s, 6, 3, 1, 1);

  934.                         else

  935.                             put_mb_modes(s, 8 - s->mv_dir, 2, 1, 1);

  936.                         put_qscale(s);

  937.                     } else {

  938.                         put_mb_modes(s, 5 - s->mv_dir, 3, 1, 1);

  939.                     }

  940.                 } else {                        // No coded bloc pattern

  941.                     put_bits(&s->pb, 5 - s->mv_dir, 2);

  942.                     put_bits(&s->pb, 2, 1);     /* motion_type: field */

  943.                     s->qscale -= s->dquant;

  944.                 }

  945.                 s->misc_bits += get_bits_diff(s);

  946.                 if (s->mv_dir & MV_DIR_FORWARD) {

  947.                     for (i = 0; i < 2; i++) {

  948.                         put_bits(&s->pb, 1, s->field_select[0][i]);

  949.                         mpeg1_encode_motion(s,

  950.                                             s->mv[0][i][0] - s->last_mv[0][i][0],

  951.                                             s->f_code);

  952.                         mpeg1_encode_motion(s,

  953.                                             s->mv[0][i][1] - (s->last_mv[0][i][1] >> 1),

  954.                                             s->f_code);

  955.                         s->last_mv[0][i][0] = s->mv[0][i][0];

  956.                         s->last_mv[0][i][1] = s->mv[0][i][1] * 2;

  957.                     }

  958.                     s->f_count++;

  959.                 }

  960.                 if (s->mv_dir & MV_DIR_BACKWARD) {

  961.                     for (i = 0; i < 2; i++) {

  962.                         put_bits(&s->pb, 1, s->field_select[1][i]);

  963.                         mpeg1_encode_motion(s,

  964.                                             s->mv[1][i][0] - s->last_mv[1][i][0],

  965.                                             s->b_code);

  966.                         mpeg1_encode_motion(s,

  967.                                             s->mv[1][i][1] - (s->last_mv[1][i][1] >> 1),

  968.                                             s->b_code);

  969.                         s->last_mv[1][i][0] = s->mv[1][i][0];

  970.                         s->last_mv[1][i][1] = s->mv[1][i][1] * 2;

  971.                     }

  972.                     s->b_count++;

  973.                 }

  974.             }

  975.             s->mv_bits += get_bits_diff(s);

  976.             if (cbp) {

  977.                 if (s->chroma_y_shift) {

  978.                     put_bits(&s->pb,

  979.                              ff_mpeg12_mbPatTable[cbp][1],

  980.                              ff_mpeg12_mbPatTable[cbp][0]);

  981.                 } else {

  982.                     put_bits(&s->pb,

  983.                              ff_mpeg12_mbPatTable[cbp >> 2][1],

  984.                              ff_mpeg12_mbPatTable[cbp >> 2][0]);

  985.                     put_sbits(&s->pb, 2, cbp);

  986.                 }

  987.             }

  988.         }

  989.         for (i = 0; i < mb_block_count; i++)

  990.             if (cbp & (1 << (mb_block_count - 1 - i)))

  991.                 mpeg1_encode_block(s, block[i], i);

  992.         s->mb_skip_run = 0;

  993.         if (s->mb_intra)

  994.             s->i_tex_bits += get_bits_diff(s);

  995.         else

  996.             s->p_tex_bits += get_bits_diff(s);

  997.     }

  998. }

  999. 

  1000. void ff_mpeg1_encode_mb(MpegEncContext *s, int16_t block[8][64],

  1001.                         int motion_x, int motion_y)

  1002. {

  1003.     if (s->chroma_format == CHROMA_420)

  1004.         mpeg1_encode_mb_internal(s, block, motion_x, motion_y, 6);

  1005.     else

  1006.         mpeg1_encode_mb_internal(s, block, motion_x, motion_y, 8);

  1007. }

  1008. 

  1009. av_cold void ff_mpeg1_encode_init(MpegEncContext *s)

  1010. {

  1011.     static int done = 0;

  1012. 

  1013.     ff_mpeg12_common_init(s);

  1014. 

  1015.     if (!done) {

  1016.         int f_code;

  1017.         int mv;

  1018.         int i;

  1019. 

  1020.         done = 1;

  1021.         ff_rl_init(&ff_rl_mpeg1, ff_mpeg12_static_rl_table_store[0]);

  1022.         ff_rl_init(&ff_rl_mpeg2, ff_mpeg12_static_rl_table_store[1]);

  1023. 

  1024.         for (i = 0; i < 64; i++) {

  1025.             mpeg1_max_level[0][i] = ff_rl_mpeg1.max_level[0][i];

  1026.             mpeg1_index_run[0][i] = ff_rl_mpeg1.index_run[0][i];

  1027.         }

  1028. 

  1029.         init_uni_ac_vlc(&ff_rl_mpeg1, uni_mpeg1_ac_vlc_len);

  1030.         if (s->intra_vlc_format)

  1031.             init_uni_ac_vlc(&ff_rl_mpeg2, uni_mpeg2_ac_vlc_len);

  1032. 

  1033.         /* build unified dc encoding tables */

  1034.         for (i = -255; i < 256; i++) {

  1035.             int adiff, index;

  1036.             int bits, code;

  1037.             int diff = i;

  1038. 

  1039.             adiff = FFABS(diff);

  1040.             if (diff < 0)

  1041.                 diff--;

  1042.             index = av_log2(2 * adiff);

  1043. 

  1044.             bits = ff_mpeg12_vlc_dc_lum_bits[index] + index;

  1045.             code = (ff_mpeg12_vlc_dc_lum_code[index] << index) +

  1046.                     av_mod_uintp2(diff, index);

  1047.             mpeg1_lum_dc_uni[i + 255] = bits + (code << 8);

  1048. 

  1049.             bits = ff_mpeg12_vlc_dc_chroma_bits[index] + index;

  1050.             code = (ff_mpeg12_vlc_dc_chroma_code[index] << index) +

  1051.                     av_mod_uintp2(diff, index);

  1052.             mpeg1_chr_dc_uni[i + 255] = bits + (code << 8);

  1053.         }

  1054. 

  1055.         for (f_code = 1; f_code <= MAX_FCODE; f_code++)

  1056.             for (mv = -MAX_MV; mv <= MAX_MV; mv++) {

  1057.                 int len;

  1058. 

  1059.                 if (mv == 0) {

  1060.                     len = ff_mpeg12_mbMotionVectorTable[0][1];

  1061.                 } else {

  1062.                     int val, bit_size, code;

  1063. 

  1064.                     bit_size = f_code - 1;

  1065. 

  1066.                     val = mv;

  1067.                     if (val < 0)

  1068.                         val = -val;

  1069.                     val--;

  1070.                     code = (val >> bit_size) + 1;

  1071.                     if (code < 17)

  1072.                         len = ff_mpeg12_mbMotionVectorTable[code][1] +

  1073.                               1 + bit_size;

  1074.                     else

  1075.                         len = ff_mpeg12_mbMotionVectorTable[16][1] +

  1076.                               2 + bit_size;

  1077.                 }

  1078. 

  1079.                 mv_penalty[f_code][mv + MAX_MV] = len;

  1080.             }

  1081. 

  1082. 

  1083.         for (f_code = MAX_FCODE; f_code > 0; f_code--)

  1084.             for (mv = -(8 << f_code); mv < (8 << f_code); mv++)

  1085.                 fcode_tab[mv + MAX_MV] = f_code;

  1086.     }

  1087.     s->me.mv_penalty = mv_penalty;

  1088.     s->fcode_tab     = fcode_tab;

  1089.     if (s->codec_id == AV_CODEC_ID_MPEG1VIDEO) {

  1090.         s->min_qcoeff = -255;

  1091.         s->max_qcoeff = 255;

  1092.     } else {

  1093.         s->min_qcoeff = -2047;

  1094.         s->max_qcoeff = 2047;

  1095.     }

  1096.     if (s->intra_vlc_format) {

  1097.         s->intra_ac_vlc_length      =

  1098.         s->intra_ac_vlc_last_length = uni_mpeg2_ac_vlc_len;

  1099.     } else {

  1100.         s->intra_ac_vlc_length      =

  1101.         s->intra_ac_vlc_last_length = uni_mpeg1_ac_vlc_len;

  1102.     }

  1103.     s->inter_ac_vlc_length      =

  1104.     s->inter_ac_vlc_last_length = uni_mpeg1_ac_vlc_len;

  1105. }

  1106. 

  1107. #define OFFSET(x) offsetof(MpegEncContext, x)

  1108. #define VE AV_OPT_FLAG_ENCODING_PARAM | AV_OPT_FLAG_VIDEO_PARAM

  1109. #define COMMON_OPTS                                                           \

  1110.     { "gop_timecode",        "MPEG GOP Timecode in hh:mm:ss[:;.]ff format",   \

  1111.       OFFSET(tc_opt_str), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX, VE },\

  1112.     { "intra_vlc",           "Use MPEG-2 intra VLC table.",                   \

  1113.       OFFSET(intra_vlc_format),    AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, VE }, \

  1114.     { "drop_frame_timecode", "Timecode is in drop frame format.",             \

  1115.       OFFSET(drop_frame_timecode), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, VE }, \

  1116.     { "scan_offset",         "Reserve space for SVCD scan offset user data.", \

  1117.       OFFSET(scan_offset),         AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, VE },

  1118. 

  1119. static const AVOption mpeg1_options[] = {

  1120.     COMMON_OPTS

  1121.     FF_MPV_COMMON_OPTS

  1122.     { NULL },

  1123. };

  1124. 

  1125. static const AVOption mpeg2_options[] = {

  1126.     COMMON_OPTS

  1127.     { "non_linear_quant", "Use nonlinear quantizer.",    OFFSET(q_scale_type),   AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, VE },

  1128.     { "alternate_scan",   "Enable alternate scantable.", OFFSET(alternate_scan), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, VE },

  1129.     { "seq_disp_ext",     "Write sequence_display_extension blocks.", OFFSET(seq_disp_ext), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, 1, VE, "seq_disp_ext" },

  1130.     {     "auto",   NULL, 0, AV_OPT_TYPE_CONST,  {.i64 = -1},  0, 0, VE, "seq_disp_ext" },

  1131.     {     "never",  NULL, 0, AV_OPT_TYPE_CONST,  {.i64 = 0 },  0, 0, VE, "seq_disp_ext" },

  1132.     {     "always", NULL, 0, AV_OPT_TYPE_CONST,  {.i64 = 1 },  0, 0, VE, "seq_disp_ext" },

  1133.     FF_MPV_COMMON_OPTS

  1134.     { NULL },

  1135. };

  1136. 

  1137. #define mpeg12_class(x)                                 \

  1138. static const AVClass mpeg ## x ## _class = {            \

  1139.     .class_name = "mpeg" # x "video encoder",           \

  1140.     .item_name  = av_default_item_name,                 \

  1141.     .option     = mpeg ## x ## _options,                \

  1142.     .version    = LIBAVUTIL_VERSION_INT,                \

  1143. };

  1144. 

  1145. mpeg12_class(1)

  1146. mpeg12_class(2)

  1147. 

  1148. AVCodec ff_mpeg1video_encoder = {

  1149.     .name                 = "mpeg1video",

  1150.     .long_name            = NULL_IF_CONFIG_SMALL("MPEG-1 video"),

  1151.     .type                 = AVMEDIA_TYPE_VIDEO,

  1152.     .id                   = AV_CODEC_ID_MPEG1VIDEO,

  1153.     .priv_data_size       = sizeof(MpegEncContext),

  1154.     .init                 = encode_init,

  1155.     .encode2              = ff_mpv_encode_picture,

  1156.     .close                = ff_mpv_encode_end,

  1157.     .supported_framerates = ff_mpeg12_frame_rate_tab + 1,

  1158.     .pix_fmts             = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUV420P,

  1159.                                                            AV_PIX_FMT_NONE },

  1160.     .capabilities         = AV_CODEC_CAP_DELAY | AV_CODEC_CAP_SLICE_THREADS,

  1161.     .priv_class           = &mpeg1_class,

  1162. };

  1163. 

  1164. AVCodec ff_mpeg2video_encoder = {

  1165.     .name                 = "mpeg2video",

  1166.     .long_name            = NULL_IF_CONFIG_SMALL("MPEG-2 video"),

  1167.     .type                 = AVMEDIA_TYPE_VIDEO,

  1168.     .id                   = AV_CODEC_ID_MPEG2VIDEO,

  1169.     .priv_data_size       = sizeof(MpegEncContext),

  1170.     .init                 = encode_init,

  1171.     .encode2              = ff_mpv_encode_picture,

  1172.     .close                = ff_mpv_encode_end,

  1173.     .supported_framerates = ff_mpeg2_frame_rate_tab,

  1174.     .pix_fmts             = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUV420P,

  1175.                                                            AV_PIX_FMT_YUV422P,

  1176.                                                            AV_PIX_FMT_NONE },

  1177.     .capabilities         = AV_CODEC_CAP_DELAY | AV_CODEC_CAP_SLICE_THREADS,

  1178.     .priv_class           = &mpeg2_class,

  1179. };