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FFmpeg/libavcodec/rv30.c

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  1. /*

  2.  * RV30 decoder

  3.  * Copyright (c) 2007 Konstantin Shishkov

  4.  *

  5.  * This file is part of FFmpeg.

  6.  *

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

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

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

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

  11.  *

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

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

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

  15.  * Lesser General Public License for more details.

  16.  *

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

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

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

  20.  */

  21. 

  22. /**

  23.  * @file

  24.  * RV30 decoder

  25.  */

  26. 

  27. #include "avcodec.h"

  28. #include "mpegutils.h"

  29. #include "mpegvideo.h"

  30. #include "golomb.h"

  31. 

  32. #include "rv34.h"

  33. #include "rv30data.h"

  34. 

  35. 

  36. static int rv30_parse_slice_header(RV34DecContext *r, GetBitContext *gb, SliceInfo *si)

  37. {

  38.     AVCodecContext *avctx = r->s.avctx;

  39.     int mb_bits;

  40.     int w = r->s.width, h = r->s.height;

  41.     int mb_size;

  42.     int rpr;

  43. 

  44.     memset(si, 0, sizeof(SliceInfo));

  45.     if(get_bits(gb, 3))

  46.         return -1;

  47.     si->type = get_bits(gb, 2);

  48.     if(si->type == 1) si->type = 0;

  49.     if(get_bits1(gb))

  50.         return -1;

  51.     si->quant = get_bits(gb, 5);

  52.     skip_bits1(gb);

  53.     si->pts = get_bits(gb, 13);

  54.     rpr = get_bits(gb, av_log2(r->max_rpr) + 1);

  55.     if(rpr){

  56.         if (rpr > r->max_rpr) {

  57.             av_log(avctx, AV_LOG_ERROR, "rpr too large\n");

  58.             return AVERROR_INVALIDDATA;

  59.         }

  60. 

  61.         if (avctx->extradata_size < rpr * 2 + 8) {

  62.             av_log(avctx, AV_LOG_ERROR,

  63.                    "Insufficient extradata - need at least %d bytes, got %d\n",

  64.                    8 + rpr * 2, avctx->extradata_size);

  65.             return AVERROR(EINVAL);

  66.         }

  67. 

  68.         w = r->s.avctx->extradata[6 + rpr*2] << 2;

  69.         h = r->s.avctx->extradata[7 + rpr*2] << 2;

  70.     } else {

  71.         w = r->orig_width;

  72.         h = r->orig_height;

  73.     }

  74.     si->width  = w;

  75.     si->height = h;

  76.     mb_size = ((w + 15) >> 4) * ((h + 15) >> 4);

  77.     mb_bits = ff_rv34_get_start_offset(gb, mb_size);

  78.     si->start = get_bits(gb, mb_bits);

  79.     skip_bits1(gb);

  80.     return 0;

  81. }

  82. 

  83. /**

  84.  * Decode 4x4 intra types array.

  85.  */

  86. static int rv30_decode_intra_types(RV34DecContext *r, GetBitContext *gb, int8_t *dst)

  87. {

  88.     int i, j, k;

  89. 

  90.     for(i = 0; i < 4; i++, dst += r->intra_types_stride - 4){

  91.         for(j = 0; j < 4; j+= 2){

  92.             unsigned code = get_interleaved_ue_golomb(gb) << 1;

  93.             if (code > 80U*2U) {

  94.                 av_log(r->s.avctx, AV_LOG_ERROR, "Incorrect intra prediction code\n");

  95.                 return -1;

  96.             }

  97.             for(k = 0; k < 2; k++){

  98.                 int A = dst[-r->intra_types_stride] + 1;

  99.                 int B = dst[-1] + 1;

  100.                 *dst++ = rv30_itype_from_context[A * 90 + B * 9 + rv30_itype_code[code + k]];

  101.                 if(dst[-1] == 9){

  102.                     av_log(r->s.avctx, AV_LOG_ERROR, "Incorrect intra prediction mode\n");

  103.                     return -1;

  104.                 }

  105.             }

  106.         }

  107.     }

  108.     return 0;

  109. }

  110. 

  111. /**

  112.  * Decode macroblock information.

  113.  */

  114. static int rv30_decode_mb_info(RV34DecContext *r)

  115. {

  116.     static const int rv30_p_types[6] = { RV34_MB_SKIP, RV34_MB_P_16x16, RV34_MB_P_8x8, -1, RV34_MB_TYPE_INTRA, RV34_MB_TYPE_INTRA16x16 };

  117.     static const int rv30_b_types[6] = { RV34_MB_SKIP, RV34_MB_B_DIRECT, RV34_MB_B_FORWARD, RV34_MB_B_BACKWARD, RV34_MB_TYPE_INTRA, RV34_MB_TYPE_INTRA16x16 };

  118.     MpegEncContext *s = &r->s;

  119.     GetBitContext *gb = &s->gb;

  120.     unsigned code = get_interleaved_ue_golomb(gb);

  121. 

  122.     if (code > 11) {

  123.         av_log(s->avctx, AV_LOG_ERROR, "Incorrect MB type code\n");

  124.         return -1;

  125.     }

  126.     if(code > 5){

  127.         av_log(s->avctx, AV_LOG_ERROR, "dquant needed\n");

  128.         code -= 6;

  129.     }

  130.     if(s->pict_type != AV_PICTURE_TYPE_B)

  131.         return rv30_p_types[code];

  132.     else

  133.         return rv30_b_types[code];

  134. }

  135. 

  136. static inline void rv30_weak_loop_filter(uint8_t *src, const int step,

  137.                                          const int stride, const int lim)

  138. {

  139.     const uint8_t *cm = ff_crop_tab + MAX_NEG_CROP;

  140.     int i, diff;

  141. 

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

  143.         diff = ((src[-2*step] - src[1*step]) - (src[-1*step] - src[0*step])*4) >> 3;

  144.         diff = av_clip(diff, -lim, lim);

  145.         src[-1*step] = cm[src[-1*step] + diff];

  146.         src[ 0*step] = cm[src[ 0*step] - diff];

  147.         src += stride;

  148.     }

  149. }

  150. 

  151. static void rv30_loop_filter(RV34DecContext *r, int row)

  152. {

  153.     MpegEncContext *s = &r->s;

  154.     int mb_pos, mb_x;

  155.     int i, j, k;

  156.     uint8_t *Y, *C;

  157.     int loc_lim, cur_lim, left_lim = 0, top_lim = 0;

  158. 

  159.     mb_pos = row * s->mb_stride;

  160.     for(mb_x = 0; mb_x < s->mb_width; mb_x++, mb_pos++){

  161.         int mbtype = s->current_picture_ptr->mb_type[mb_pos];

  162.         if(IS_INTRA(mbtype) || IS_SEPARATE_DC(mbtype))

  163.             r->deblock_coefs[mb_pos] = 0xFFFF;

  164.         if(IS_INTRA(mbtype))

  165.             r->cbp_chroma[mb_pos] = 0xFF;

  166.     }

  167. 

  168.     /* all vertical edges are filtered first

  169.      * and horizontal edges are filtered on the next iteration

  170.      */

  171.     mb_pos = row * s->mb_stride;

  172.     for(mb_x = 0; mb_x < s->mb_width; mb_x++, mb_pos++){

  173.         cur_lim = rv30_loop_filt_lim[s->current_picture_ptr->qscale_table[mb_pos]];

  174.         if(mb_x)

  175.             left_lim = rv30_loop_filt_lim[s->current_picture_ptr->qscale_table[mb_pos - 1]];

  176.         for(j = 0; j < 16; j += 4){

  177.             Y = s->current_picture_ptr->f->data[0] + mb_x*16 + (row*16 + j) * s->linesize + 4 * !mb_x;

  178.             for(i = !mb_x; i < 4; i++, Y += 4){

  179.                 int ij = i + j;

  180.                 loc_lim = 0;

  181.                 if(r->deblock_coefs[mb_pos] & (1 << ij))

  182.                     loc_lim = cur_lim;

  183.                 else if(!i && r->deblock_coefs[mb_pos - 1] & (1 << (ij + 3)))

  184.                     loc_lim = left_lim;

  185.                 else if( i && r->deblock_coefs[mb_pos]     & (1 << (ij - 1)))

  186.                     loc_lim = cur_lim;

  187.                 if(loc_lim)

  188.                     rv30_weak_loop_filter(Y, 1, s->linesize, loc_lim);

  189.             }

  190.         }

  191.         for(k = 0; k < 2; k++){

  192.             int cur_cbp, left_cbp = 0;

  193.             cur_cbp = (r->cbp_chroma[mb_pos] >> (k*4)) & 0xF;

  194.             if(mb_x)

  195.                 left_cbp = (r->cbp_chroma[mb_pos - 1] >> (k*4)) & 0xF;

  196.             for(j = 0; j < 8; j += 4){

  197.                 C = s->current_picture_ptr->f->data[k + 1] + mb_x*8 + (row*8 + j) * s->uvlinesize + 4 * !mb_x;

  198.                 for(i = !mb_x; i < 2; i++, C += 4){

  199.                     int ij = i + (j >> 1);

  200.                     loc_lim = 0;

  201.                     if (cur_cbp & (1 << ij))

  202.                         loc_lim = cur_lim;

  203.                     else if(!i && left_cbp & (1 << (ij + 1)))

  204.                         loc_lim = left_lim;

  205.                     else if( i && cur_cbp  & (1 << (ij - 1)))

  206.                         loc_lim = cur_lim;

  207.                     if(loc_lim)

  208.                         rv30_weak_loop_filter(C, 1, s->uvlinesize, loc_lim);

  209.                 }

  210.             }

  211.         }

  212.     }

  213.     mb_pos = row * s->mb_stride;

  214.     for(mb_x = 0; mb_x < s->mb_width; mb_x++, mb_pos++){

  215.         cur_lim = rv30_loop_filt_lim[s->current_picture_ptr->qscale_table[mb_pos]];

  216.         if(row)

  217.             top_lim = rv30_loop_filt_lim[s->current_picture_ptr->qscale_table[mb_pos - s->mb_stride]];

  218.         for(j = 4*!row; j < 16; j += 4){

  219.             Y = s->current_picture_ptr->f->data[0] + mb_x*16 + (row*16 + j) * s->linesize;

  220.             for(i = 0; i < 4; i++, Y += 4){

  221.                 int ij = i + j;

  222.                 loc_lim = 0;

  223.                 if(r->deblock_coefs[mb_pos] & (1 << ij))

  224.                     loc_lim = cur_lim;

  225.                 else if(!j && r->deblock_coefs[mb_pos - s->mb_stride] & (1 << (ij + 12)))

  226.                     loc_lim = top_lim;

  227.                 else if( j && r->deblock_coefs[mb_pos]                & (1 << (ij - 4)))

  228.                     loc_lim = cur_lim;

  229.                 if(loc_lim)

  230.                     rv30_weak_loop_filter(Y, s->linesize, 1, loc_lim);

  231.             }

  232.         }

  233.         for(k = 0; k < 2; k++){

  234.             int cur_cbp, top_cbp = 0;

  235.             cur_cbp = (r->cbp_chroma[mb_pos] >> (k*4)) & 0xF;

  236.             if(row)

  237.                 top_cbp = (r->cbp_chroma[mb_pos - s->mb_stride] >> (k*4)) & 0xF;

  238.             for(j = 4*!row; j < 8; j += 4){

  239.                 C = s->current_picture_ptr->f->data[k+1] + mb_x*8 + (row*8 + j) * s->uvlinesize;

  240.                 for(i = 0; i < 2; i++, C += 4){

  241.                     int ij = i + (j >> 1);

  242.                     loc_lim = 0;

  243.                     if (r->cbp_chroma[mb_pos] & (1 << ij))

  244.                         loc_lim = cur_lim;

  245.                     else if(!j && top_cbp & (1 << (ij + 2)))

  246.                         loc_lim = top_lim;

  247.                     else if( j && cur_cbp & (1 << (ij - 2)))

  248.                         loc_lim = cur_lim;

  249.                     if(loc_lim)

  250.                         rv30_weak_loop_filter(C, s->uvlinesize, 1, loc_lim);

  251.                 }

  252.             }

  253.         }

  254.     }

  255. }

  256. 

  257. /**

  258.  * Initialize decoder.

  259.  */

  260. static av_cold int rv30_decode_init(AVCodecContext *avctx)

  261. {

  262.     RV34DecContext *r = avctx->priv_data;

  263.     int ret;

  264. 

  265.     r->orig_width  = avctx->coded_width;

  266.     r->orig_height = avctx->coded_height;

  267. 

  268.     if (avctx->extradata_size < 2) {

  269.         av_log(avctx, AV_LOG_ERROR, "Extradata is too small.\n");

  270.         return AVERROR(EINVAL);

  271.     }

  272.     r->rv30 = 1;

  273.     if ((ret = ff_rv34_decode_init(avctx)) < 0)

  274.         return ret;

  275. 

  276.     r->max_rpr = avctx->extradata[1] & 7;

  277.     if(avctx->extradata_size < 2*r->max_rpr + 8){

  278.         av_log(avctx, AV_LOG_WARNING, "Insufficient extradata - need at least %d bytes, got %d\n",

  279.                2*r->max_rpr + 8, avctx->extradata_size);

  280.     }

  281. 

  282.     r->parse_slice_header = rv30_parse_slice_header;

  283.     r->decode_intra_types = rv30_decode_intra_types;

  284.     r->decode_mb_info     = rv30_decode_mb_info;

  285.     r->loop_filter        = rv30_loop_filter;

  286.     r->luma_dc_quant_i = rv30_luma_dc_quant;

  287.     r->luma_dc_quant_p = rv30_luma_dc_quant;

  288.     return 0;

  289. }

  290. 

  291. AVCodec ff_rv30_decoder = {

  292.     .name                  = "rv30",

  293.     .long_name             = NULL_IF_CONFIG_SMALL("RealVideo 3.0"),

  294.     .type                  = AVMEDIA_TYPE_VIDEO,

  295.     .id                    = AV_CODEC_ID_RV30,

  296.     .priv_data_size        = sizeof(RV34DecContext),

  297.     .init                  = rv30_decode_init,

  298.     .close                 = ff_rv34_decode_end,

  299.     .decode                = ff_rv34_decode_frame,

  300.     .capabilities          = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_DELAY |

  301.                              AV_CODEC_CAP_FRAME_THREADS,

  302.     .flush                 = ff_mpeg_flush,

  303.     .pix_fmts              = (const enum AVPixelFormat[]) {

  304.         AV_PIX_FMT_YUV420P,

  305.         AV_PIX_FMT_NONE

  306.     },

  307.     .init_thread_copy      = ONLY_IF_THREADS_ENABLED(ff_rv34_decode_init_thread_copy),

  308.     .update_thread_context = ONLY_IF_THREADS_ENABLED(ff_rv34_decode_update_thread_context),

  309. };