svq3.c File Reference

Go to the source code of this file.

Defines
#define	FULLPEL_MODE   1
#define	HALFPEL_MODE   2
#define	THIRDPEL_MODE   3
#define	PREDICT_MODE   4
#define	stride   16
Functions
static void	svq3_luma_dc_dequant_idct_c (DCTELEM *block, int qp)
static void	svq3_add_idct_c (uint8_t *dst, DCTELEM *block, int stride, int qp, int dc)
static int	svq3_decode_block (GetBitContext *gb, DCTELEM *block, int index, const int type)
static void	svq3_mc_dir_part (MpegEncContext *s, int x, int y, int width, int height, int mx, int my, int dxy, int thirdpel, int dir, int avg)
static int	svq3_mc_dir (H264Context *h, int size, int mode, int dir, int avg)
static int	svq3_decode_mb (H264Context *h, unsigned int mb_type)
static int	svq3_decode_slice_header (H264Context *h)
static int	svq3_decode_frame (AVCodecContext *avctx, void *data, int *data_size, const uint8_t *buf, int buf_size)
Variables
static const uint8_t	svq3_scan [16]
static const uint8_t	svq3_pred_0 [25][2]
static const int8_t	svq3_pred_1 [6][6][5]
struct {
uint8_t   run
uint8_t   level
}	svq3_dct_tables [2][16]
static const uint32_t	svq3_dequant_coeff [32]
AVCodec	svq3_decoder

---

Detailed Description

svq3 decoder.

Definition in file svq3.c.

---

Define Documentation

#define FULLPEL_MODE   1

Definition at line 48 of file svq3.c.

Referenced by svq3_decode_mb().

#define HALFPEL_MODE   2

Definition at line 49 of file svq3.c.

Referenced by svq3_decode_mb(), and svq3_mc_dir().

#define PREDICT_MODE   4

Definition at line 51 of file svq3.c.

Referenced by svq3_decode_mb(), and svq3_mc_dir().

#define stride   16

#define THIRDPEL_MODE   3

Definition at line 50 of file svq3.c.

Referenced by svq3_decode_mb(), and svq3_mc_dir().

---

Function Documentation

static void svq3_add_idct_c	(	uint8_t *	dst,
		DCTELEM *	block,
		int	stride,
		int	qp,
		int	dc
	)			[static]

Definition at line 147 of file svq3.c.

References cm, ff_cropTbl, MAX_NEG_CROP, and svq3_dequant_coeff.

                                                                                      {
    const int qmul= svq3_dequant_coeff[qp];
    int i;
    uint8_t *cm = ff_cropTbl + MAX_NEG_CROP;

    if (dc) {
        dc = 13*13*((dc == 1) ? 1538*block[0] : ((qmul*(block[0] >> 3)) / 2));
        block[0] = 0;
    }

    for (i=0; i < 4; i++) {
        const int z0= 13*(block[0 + 4*i] +    block[2 + 4*i]);
        const int z1= 13*(block[0 + 4*i] -    block[2 + 4*i]);
        const int z2=  7* block[1 + 4*i] - 17*block[3 + 4*i];
        const int z3= 17* block[1 + 4*i] +  7*block[3 + 4*i];

        block[0 + 4*i]= z0 + z3;
        block[1 + 4*i]= z1 + z2;
        block[2 + 4*i]= z1 - z2;
        block[3 + 4*i]= z0 - z3;
    }

    for (i=0; i < 4; i++) {
        const int z0= 13*(block[i + 4*0] +    block[i + 4*2]);
        const int z1= 13*(block[i + 4*0] -    block[i + 4*2]);
        const int z2=  7* block[i + 4*1] - 17*block[i + 4*3];
        const int z3= 17* block[i + 4*1] +  7*block[i + 4*3];
        const int rr= (dc + 0x80000);

        dst[i + stride*0]= cm[ dst[i + stride*0] + (((z0 + z3)*qmul + rr) >> 20) ];
        dst[i + stride*1]= cm[ dst[i + stride*1] + (((z1 + z2)*qmul + rr) >> 20) ];
        dst[i + stride*2]= cm[ dst[i + stride*2] + (((z1 - z2)*qmul + rr) >> 20) ];
        dst[i + stride*3]= cm[ dst[i + stride*3] + (((z0 - z3)*qmul + rr) >> 20) ];
    }
}

static int svq3_decode_block	(	GetBitContext *	gb,
		DCTELEM *	block,
		int	index,
		const int	type
	)			[inline, static]

Definition at line 183 of file svq3.c.

References chroma_dc_scan, INVALID_VLC, level, luma_dc_zigzag_scan, run, svq3_dct_tables, svq3_get_ue_golomb(), svq3_scan, and zigzag_scan.

                                                                {

  static const uint8_t *const scan_patterns[4] =
  { luma_dc_zigzag_scan, zigzag_scan, svq3_scan, chroma_dc_scan };

  int run, level, sign, vlc, limit;
  const int intra = (3 * type) >> 2;
  const uint8_t *const scan = scan_patterns[type];

  for (limit=(16 >> intra); index < 16; index=limit, limit+=8) {
    for (; (vlc = svq3_get_ue_golomb (gb)) != 0; index++) {

      if (vlc == INVALID_VLC)
        return -1;

      sign = (vlc & 0x1) - 1;
      vlc  = (vlc + 1) >> 1;

      if (type == 3) {
        if (vlc < 3) {
          run   = 0;
          level = vlc;
        } else if (vlc < 4) {
          run   = 1;
          level = 1;
        } else {
          run   = (vlc & 0x3);
          level = ((vlc + 9) >> 2) - run;
        }
      } else {
        if (vlc < 16) {
          run   = svq3_dct_tables[intra][vlc].run;
          level = svq3_dct_tables[intra][vlc].level;
        } else if (intra) {
          run   = (vlc & 0x7);
          level = (vlc >> 3) + ((run == 0) ? 8 : ((run < 2) ? 2 : ((run < 5) ? 0 : -1)));
        } else {
          run   = (vlc & 0xF);
          level = (vlc >> 4) + ((run == 0) ? 4 : ((run < 3) ? 2 : ((run < 10) ? 1 : 0)));
        }
      }

      if ((index += run) >= limit)
        return -1;

      block[scan[index]] = (level ^ sign) - sign;
    }

    if (type != 2) {
      break;
    }
  }

  return 0;
}

static int svq3_decode_frame	(	AVCodecContext *	avctx,
		void *	data,
		int *	data_size,
		const uint8_t *	buf,
		int	buf_size
	)			[static]

Definition at line 761 of file svq3.c.

References MpegEncContext::adaptive_quant, alloc_tables(), av_get_pict_type_char(), av_log(), AV_LOG_DEBUG, AV_LOG_ERROR, AV_RB32, AVDISCARD_ALL, AVDISCARD_NONKEY, AVDISCARD_NONREF, H264Context::b_stride, H264Context::chroma_qp, MpegEncContext::context_initialized, MpegEncContext::current_picture, AVCodecContext::debug, AVCodecContext::extradata, AVCodecContext::extradata_size, FF_B_TYPE, FF_DEBUG_PICT_INFO, FF_I_TYPE, AVCodecContext::flags, MpegEncContext::flags, AVCodecContext::flags2, MpegEncContext::flags2, for(), frame_start(), MpegEncContext::gb, get_bits(), get_bits1(), get_bits_count(), H264Context::halfpel_flag, AVCodecContext::has_b_frames, AVCodecContext::height, MpegEncContext::height, AVCodecContext::hurry_up, init_get_bits(), MpegEncContext::last_picture_ptr, MpegEncContext::low_delay, MpegEncContext::mb_height, MpegEncContext::mb_stride, MpegEncContext::mb_width, MpegEncContext::mb_x, H264Context::mb_xy, MpegEncContext::mb_y, MPV_common_init(), MpegEncContext::next_p_frame_damaged, MpegEncContext::next_picture, MpegEncContext::next_picture_ptr, NULL, PART_NOT_AVAILABLE, MpegEncContext::pict_type, MpegEncContext::picture_number, AVCodecContext::priv_data, MpegEncContext::qscale, scan8, show_bits(), size, GetBitContext::size_in_bits, skip_bits(), skip_bits1(), AVCodecContext::skip_frame, svq3_decode_slice_header(), H264Context::thirdpel_flag, H264Context::unknown_svq3_flag, MpegEncContext::unrestricted_mv, AVCodecContext::width, and MpegEncContext::width.

                                                                {
  MpegEncContext *const s = avctx->priv_data;
  H264Context *const h = avctx->priv_data;
  int m, mb_type;
  unsigned char *extradata;
  unsigned int size;

  s->flags = avctx->flags;
  s->flags2 = avctx->flags2;
  s->unrestricted_mv = 1;

  if (!s->context_initialized) {
    s->width = avctx->width;
    s->height = avctx->height;
    h->halfpel_flag = 1;
    h->thirdpel_flag = 1;
    h->unknown_svq3_flag = 0;
    h->chroma_qp[0] = h->chroma_qp[1] = 4;

    if (MPV_common_init (s) < 0)
      return -1;

    h->b_stride = 4*s->mb_width;

    alloc_tables (h);

    /* prowl for the "SEQH" marker in the extradata */
    extradata = (unsigned char *)avctx->extradata;
    for (m = 0; m < avctx->extradata_size; m++) {
      if (!memcmp (extradata, "SEQH", 4))
        break;
      extradata++;
    }

    /* if a match was found, parse the extra data */
    if (extradata && !memcmp (extradata, "SEQH", 4)) {

      GetBitContext gb;

      size = AV_RB32(&extradata[4]);
      init_get_bits (&gb, extradata + 8, size*8);

      /* 'frame size code' and optional 'width, height' */
      if (get_bits (&gb, 3) == 7) {
        skip_bits (&gb, 12);
        skip_bits (&gb, 12);
      }

      h->halfpel_flag = get_bits1 (&gb);
      h->thirdpel_flag = get_bits1 (&gb);

      /* unknown fields */
      skip_bits1 (&gb);
      skip_bits1 (&gb);
      skip_bits1 (&gb);
      skip_bits1 (&gb);

      s->low_delay = get_bits1 (&gb);

      /* unknown field */
      skip_bits1 (&gb);

      while (get_bits1 (&gb)) {
        skip_bits (&gb, 8);
      }

      h->unknown_svq3_flag = get_bits1 (&gb);
      avctx->has_b_frames = !s->low_delay;
    }
  }

  /* special case for last picture */
  if (buf_size == 0) {
    if (s->next_picture_ptr && !s->low_delay) {
      *(AVFrame *) data = *(AVFrame *) &s->next_picture;
      s->next_picture_ptr= NULL;
      *data_size = sizeof(AVFrame);
    }
    return 0;
  }

  init_get_bits (&s->gb, buf, 8*buf_size);

  s->mb_x = s->mb_y = h->mb_xy = 0;

  if (svq3_decode_slice_header (h))
    return -1;

  s->pict_type = h->slice_type;
  s->picture_number = h->slice_num;

  if(avctx->debug&FF_DEBUG_PICT_INFO){
      av_log(h->s.avctx, AV_LOG_DEBUG, "%c hpel:%d, tpel:%d aqp:%d qp:%d, slice_num:%02X\n",
      av_get_pict_type_char(s->pict_type), h->halfpel_flag, h->thirdpel_flag,
      s->adaptive_quant, s->qscale, h->slice_num
      );
  }

  /* for hurry_up==5 */
  s->current_picture.pict_type = s->pict_type;
  s->current_picture.key_frame = (s->pict_type == FF_I_TYPE);

  /* Skip B-frames if we do not have reference frames. */
  if (s->last_picture_ptr == NULL && s->pict_type == FF_B_TYPE) return 0;
  /* Skip B-frames if we are in a hurry. */
  if (avctx->hurry_up && s->pict_type == FF_B_TYPE) return 0;
  /* Skip everything if we are in a hurry >= 5. */
  if (avctx->hurry_up >= 5) return 0;
  if(  (avctx->skip_frame >= AVDISCARD_NONREF && s->pict_type==FF_B_TYPE)
     ||(avctx->skip_frame >= AVDISCARD_NONKEY && s->pict_type!=FF_I_TYPE)
     || avctx->skip_frame >= AVDISCARD_ALL)
      return 0;

  if (s->next_p_frame_damaged) {
    if (s->pict_type == FF_B_TYPE)
      return 0;
    else
      s->next_p_frame_damaged = 0;
  }

  if (frame_start (h) < 0)
    return -1;

  if (s->pict_type == FF_B_TYPE) {
    h->frame_num_offset = (h->slice_num - h->prev_frame_num);

    if (h->frame_num_offset < 0) {
      h->frame_num_offset += 256;
    }
    if (h->frame_num_offset == 0 || h->frame_num_offset >= h->prev_frame_num_offset) {
      av_log(h->s.avctx, AV_LOG_ERROR, "error in B-frame picture id\n");
      return -1;
    }
  } else {
    h->prev_frame_num = h->frame_num;
    h->frame_num = h->slice_num;
    h->prev_frame_num_offset = (h->frame_num - h->prev_frame_num);

    if (h->prev_frame_num_offset < 0) {
      h->prev_frame_num_offset += 256;
    }
  }

  for(m=0; m<2; m++){
    int i;
    for(i=0; i<4; i++){
      int j;
      for(j=-1; j<4; j++)
        h->ref_cache[m][scan8[0] + 8*i + j]= 1;
      if(i<3)
        h->ref_cache[m][scan8[0] + 8*i + j]= PART_NOT_AVAILABLE;
    }
  }

  for (s->mb_y=0; s->mb_y < s->mb_height; s->mb_y++) {
    for (s->mb_x=0; s->mb_x < s->mb_width; s->mb_x++) {
      h->mb_xy = s->mb_x + s->mb_y*s->mb_stride;

      if ( (get_bits_count(&s->gb) + 7) >= s->gb.size_in_bits &&
          ((get_bits_count(&s->gb) & 7) == 0 || show_bits (&s->gb, (-get_bits_count(&s->gb) & 7)) == 0)) {

        skip_bits(&s->gb, h->next_slice_index - get_bits_count(&s->gb));
        s->gb.size_in_bits = 8*buf_size;

        if (svq3_decode_slice_header (h))
          return -1;

        /* TODO: support s->mb_skip_run */
      }

      mb_type = svq3_get_ue_golomb (&s->gb);

      if (s->pict_type == FF_I_TYPE) {
        mb_type += 8;
      } else if (s->pict_type == FF_B_TYPE && mb_type >= 4) {
        mb_type += 4;
      }
      if (mb_type > 33 || svq3_decode_mb (h, mb_type)) {
        av_log(h->s.avctx, AV_LOG_ERROR, "error while decoding MB %d %d\n", s->mb_x, s->mb_y);
        return -1;
      }

      if (mb_type != 0) {
        hl_decode_mb (h);
      }

      if (s->pict_type != FF_B_TYPE && !s->low_delay) {
        s->current_picture.mb_type[s->mb_x + s->mb_y*s->mb_stride] =
                        (s->pict_type == FF_P_TYPE && mb_type < 8) ? (mb_type - 1) : -1;
      }
    }

    ff_draw_horiz_band(s, 16*s->mb_y, 16);
  }

  MPV_frame_end(s);

  if (s->pict_type == FF_B_TYPE || s->low_delay) {
    *(AVFrame *) data = *(AVFrame *) &s->current_picture;
  } else {
    *(AVFrame *) data = *(AVFrame *) &s->last_picture;
  }

  avctx->frame_number = s->picture_number - 1;

  /* Do not output the last pic after seeking. */
  if (s->last_picture_ptr || s->low_delay) {
    *data_size = sizeof(AVFrame);
  }

  return buf_size;
}

static int svq3_decode_mb	(	H264Context *	h,
		unsigned int	mb_type
	)			[static]

Definition at line 408 of file svq3.c.

References H264Context::b_stride, MpegEncContext::current_picture, FF_B_TYPE, FF_P_TYPE, FFMIN, for(), FULLPEL_MODE, MpegEncContext::gb, get_bits1(), H264Context::halfpel_flag, HALFPEL_MODE, H264Context::intra4x4_pred_mode, H264Context::left_samples_available, MpegEncContext::mb_stride, MB_TYPE_16x16, MB_TYPE_SKIP, MpegEncContext::mb_width, MpegEncContext::mb_x, H264Context::mb_xy, MpegEncContext::mb_y, MpegEncContext::next_picture, PART_NOT_AVAILABLE, MpegEncContext::pict_type, PREDICT_MODE, scan8, svq3_mc_dir(), svq3_mc_dir_part(), H264Context::thirdpel_flag, THIRDPEL_MODE, H264Context::top_samples_available, and H264Context::topright_samples_available.

                                                                 {
  int i, j, k, m, dir, mode;
  int cbp = 0;
  uint32_t vlc;
  int8_t *top, *left;
  MpegEncContext *const s = (MpegEncContext *) h;
  const int mb_xy = h->mb_xy;
  const int b_xy = 4*s->mb_x + 4*s->mb_y*h->b_stride;

  h->top_samples_available        = (s->mb_y == 0) ? 0x33FF : 0xFFFF;
  h->left_samples_available        = (s->mb_x == 0) ? 0x5F5F : 0xFFFF;
  h->topright_samples_available        = 0xFFFF;

  if (mb_type == 0) {           /* SKIP */
    if (s->pict_type == FF_P_TYPE || s->next_picture.mb_type[mb_xy] == -1) {
      svq3_mc_dir_part (s, 16*s->mb_x, 16*s->mb_y, 16, 16, 0, 0, 0, 0, 0, 0);

      if (s->pict_type == FF_B_TYPE) {
        svq3_mc_dir_part (s, 16*s->mb_x, 16*s->mb_y, 16, 16, 0, 0, 0, 0, 1, 1);
      }

      mb_type = MB_TYPE_SKIP;
    } else {
      mb_type= FFMIN(s->next_picture.mb_type[mb_xy], 6);
      if(svq3_mc_dir (h, mb_type, PREDICT_MODE, 0, 0) < 0)
        return -1;
      if(svq3_mc_dir (h, mb_type, PREDICT_MODE, 1, 1) < 0)
        return -1;

      mb_type = MB_TYPE_16x16;
    }
  } else if (mb_type < 8) {     /* INTER */
    if (h->thirdpel_flag && h->halfpel_flag == !get_bits1 (&s->gb)) {
      mode = THIRDPEL_MODE;
    } else if (h->halfpel_flag && h->thirdpel_flag == !get_bits1 (&s->gb)) {
      mode = HALFPEL_MODE;
    } else {
      mode = FULLPEL_MODE;
    }

    /* fill caches */
    /* note ref_cache should contain here:
        ????????
        ???11111
        N??11111
        N??11111
        N??11111
    */

    for (m=0; m < 2; m++) {
      if (s->mb_x > 0 && h->intra4x4_pred_mode[mb_xy - 1][0] != -1) {
        for (i=0; i < 4; i++) {
          *(uint32_t *) h->mv_cache[m][scan8[0] - 1 + i*8] = *(uint32_t *) s->current_picture.motion_val[m][b_xy - 1 + i*h->b_stride];
        }
      } else {
        for (i=0; i < 4; i++) {
          *(uint32_t *) h->mv_cache[m][scan8[0] - 1 + i*8] = 0;
        }
      }
      if (s->mb_y > 0) {
        memcpy (h->mv_cache[m][scan8[0] - 1*8], s->current_picture.motion_val[m][b_xy - h->b_stride], 4*2*sizeof(int16_t));
        memset (&h->ref_cache[m][scan8[0] - 1*8], (h->intra4x4_pred_mode[mb_xy - s->mb_stride][4] == -1) ? PART_NOT_AVAILABLE : 1, 4);

        if (s->mb_x < (s->mb_width - 1)) {
          *(uint32_t *) h->mv_cache[m][scan8[0] + 4 - 1*8] = *(uint32_t *) s->current_picture.motion_val[m][b_xy - h->b_stride + 4];
          h->ref_cache[m][scan8[0] + 4 - 1*8] =
                  (h->intra4x4_pred_mode[mb_xy - s->mb_stride + 1][0] == -1 ||
                   h->intra4x4_pred_mode[mb_xy - s->mb_stride][4] == -1) ? PART_NOT_AVAILABLE : 1;
        }else
          h->ref_cache[m][scan8[0] + 4 - 1*8] = PART_NOT_AVAILABLE;
        if (s->mb_x > 0) {
          *(uint32_t *) h->mv_cache[m][scan8[0] - 1 - 1*8] = *(uint32_t *) s->current_picture.motion_val[m][b_xy - h->b_stride - 1];
          h->ref_cache[m][scan8[0] - 1 - 1*8] = (h->intra4x4_pred_mode[mb_xy - s->mb_stride - 1][3] == -1) ? PART_NOT_AVAILABLE : 1;
        }else
          h->ref_cache[m][scan8[0] - 1 - 1*8] = PART_NOT_AVAILABLE;
      }else
        memset (&h->ref_cache[m][scan8[0] - 1*8 - 1], PART_NOT_AVAILABLE, 8);

      if (s->pict_type != FF_B_TYPE)
        break;
    }

    /* decode motion vector(s) and form prediction(s) */
    if (s->pict_type == FF_P_TYPE) {
      if(svq3_mc_dir (h, (mb_type - 1), mode, 0, 0) < 0)
        return -1;
    } else {        /* FF_B_TYPE */
      if (mb_type != 2) {
        if(svq3_mc_dir (h, 0, mode, 0, 0) < 0)
          return -1;
      } else {
        for (i=0; i < 4; i++) {
          memset (s->current_picture.motion_val[0][b_xy + i*h->b_stride], 0, 4*2*sizeof(int16_t));
        }
      }
      if (mb_type != 1) {
        if(svq3_mc_dir (h, 0, mode, 1, (mb_type == 3)) < 0)
          return -1;
      } else {
        for (i=0; i < 4; i++) {
          memset (s->current_picture.motion_val[1][b_xy + i*h->b_stride], 0, 4*2*sizeof(int16_t));
        }
      }
    }

    mb_type = MB_TYPE_16x16;
  } else if (mb_type == 8 || mb_type == 33) {   /* INTRA4x4 */
    memset (h->intra4x4_pred_mode_cache, -1, 8*5*sizeof(int8_t));

    if (mb_type == 8) {
      if (s->mb_x > 0) {
        for (i=0; i < 4; i++) {
          h->intra4x4_pred_mode_cache[scan8[0] - 1 + i*8] = h->intra4x4_pred_mode[mb_xy - 1][i];
        }
        if (h->intra4x4_pred_mode_cache[scan8[0] - 1] == -1) {
          h->left_samples_available = 0x5F5F;
        }
      }
      if (s->mb_y > 0) {
        h->intra4x4_pred_mode_cache[4+8*0] = h->intra4x4_pred_mode[mb_xy - s->mb_stride][4];
        h->intra4x4_pred_mode_cache[5+8*0] = h->intra4x4_pred_mode[mb_xy - s->mb_stride][5];
        h->intra4x4_pred_mode_cache[6+8*0] = h->intra4x4_pred_mode[mb_xy - s->mb_stride][6];
        h->intra4x4_pred_mode_cache[7+8*0] = h->intra4x4_pred_mode[mb_xy - s->mb_stride][3];

        if (h->intra4x4_pred_mode_cache[4+8*0] == -1) {
          h->top_samples_available = 0x33FF;
        }
      }

      /* decode prediction codes for luma blocks */
      for (i=0; i < 16; i+=2) {
        vlc = svq3_get_ue_golomb (&s->gb);

        if (vlc >= 25){
          av_log(h->s.avctx, AV_LOG_ERROR, "luma prediction:%d\n", vlc);
          return -1;
        }

        left    = &h->intra4x4_pred_mode_cache[scan8[i] - 1];
        top     = &h->intra4x4_pred_mode_cache[scan8[i] - 8];

        left[1] = svq3_pred_1[top[0] + 1][left[0] + 1][svq3_pred_0[vlc][0]];
        left[2] = svq3_pred_1[top[1] + 1][left[1] + 1][svq3_pred_0[vlc][1]];

        if (left[1] == -1 || left[2] == -1){
          av_log(h->s.avctx, AV_LOG_ERROR, "weird prediction\n");
          return -1;
        }
      }
    } else {    /* mb_type == 33, DC_128_PRED block type */
      for (i=0; i < 4; i++) {
        memset (&h->intra4x4_pred_mode_cache[scan8[0] + 8*i], DC_PRED, 4);
      }
    }

    write_back_intra_pred_mode (h);

    if (mb_type == 8) {
      check_intra4x4_pred_mode (h);

      h->top_samples_available  = (s->mb_y == 0) ? 0x33FF : 0xFFFF;
      h->left_samples_available = (s->mb_x == 0) ? 0x5F5F : 0xFFFF;
    } else {
      for (i=0; i < 4; i++) {
        memset (&h->intra4x4_pred_mode_cache[scan8[0] + 8*i], DC_128_PRED, 4);
      }

      h->top_samples_available  = 0x33FF;
      h->left_samples_available = 0x5F5F;
    }

    mb_type = MB_TYPE_INTRA4x4;
  } else {                      /* INTRA16x16 */
    dir = i_mb_type_info[mb_type - 8].pred_mode;
    dir = (dir >> 1) ^ 3*(dir & 1) ^ 1;

    if ((h->intra16x16_pred_mode = check_intra_pred_mode (h, dir)) == -1){
      av_log(h->s.avctx, AV_LOG_ERROR, "check_intra_pred_mode = -1\n");
      return -1;
    }

    cbp = i_mb_type_info[mb_type - 8].cbp;
    mb_type = MB_TYPE_INTRA16x16;
  }

  if (!IS_INTER(mb_type) && s->pict_type != FF_I_TYPE) {
    for (i=0; i < 4; i++) {
      memset (s->current_picture.motion_val[0][b_xy + i*h->b_stride], 0, 4*2*sizeof(int16_t));
    }
    if (s->pict_type == FF_B_TYPE) {
      for (i=0; i < 4; i++) {
        memset (s->current_picture.motion_val[1][b_xy + i*h->b_stride], 0, 4*2*sizeof(int16_t));
      }
    }
  }
  if (!IS_INTRA4x4(mb_type)) {
    memset (h->intra4x4_pred_mode[mb_xy], DC_PRED, 8);
  }
  if (!IS_SKIP(mb_type) || s->pict_type == FF_B_TYPE) {
    memset (h->non_zero_count_cache + 8, 0, 4*9*sizeof(uint8_t));
    s->dsp.clear_blocks(h->mb);
  }

  if (!IS_INTRA16x16(mb_type) && (!IS_SKIP(mb_type) || s->pict_type == FF_B_TYPE)) {
    if ((vlc = svq3_get_ue_golomb (&s->gb)) >= 48){
      av_log(h->s.avctx, AV_LOG_ERROR, "cbp_vlc=%d\n", vlc);
      return -1;
    }

    cbp = IS_INTRA(mb_type) ? golomb_to_intra4x4_cbp[vlc] : golomb_to_inter_cbp[vlc];
  }
  if (IS_INTRA16x16(mb_type) || (s->pict_type != FF_I_TYPE && s->adaptive_quant && cbp)) {
    s->qscale += svq3_get_se_golomb (&s->gb);

    if (s->qscale > 31){
      av_log(h->s.avctx, AV_LOG_ERROR, "qscale:%d\n", s->qscale);
      return -1;
    }
  }
  if (IS_INTRA16x16(mb_type)) {
    if (svq3_decode_block (&s->gb, h->mb, 0, 0)){
      av_log(h->s.avctx, AV_LOG_ERROR, "error while decoding intra luma dc\n");
      return -1;
    }
  }

  if (cbp) {
    const int index = IS_INTRA16x16(mb_type) ? 1 : 0;
    const int type = ((s->qscale < 24 && IS_INTRA4x4(mb_type)) ? 2 : 1);

    for (i=0; i < 4; i++) {
      if ((cbp & (1 << i))) {
        for (j=0; j < 4; j++) {
          k = index ? ((j&1) + 2*(i&1) + 2*(j&2) + 4*(i&2)) : (4*i + j);
          h->non_zero_count_cache[ scan8[k] ] = 1;

          if (svq3_decode_block (&s->gb, &h->mb[16*k], index, type)){
            av_log(h->s.avctx, AV_LOG_ERROR, "error while decoding block\n");
            return -1;
          }
        }
      }
    }

    if ((cbp & 0x30)) {
      for (i=0; i < 2; ++i) {
        if (svq3_decode_block (&s->gb, &h->mb[16*(16 + 4*i)], 0, 3)){
          av_log(h->s.avctx, AV_LOG_ERROR, "error while decoding chroma dc block\n");
          return -1;
        }
      }

      if ((cbp & 0x20)) {
        for (i=0; i < 8; i++) {
          h->non_zero_count_cache[ scan8[16+i] ] = 1;

          if (svq3_decode_block (&s->gb, &h->mb[16*(16 + i)], 1, 1)){
            av_log(h->s.avctx, AV_LOG_ERROR, "error while decoding chroma ac block\n");
            return -1;
          }
        }
      }
    }
  }

  s->current_picture.mb_type[mb_xy] = mb_type;

  if (IS_INTRA(mb_type)) {
    h->chroma_pred_mode = check_intra_pred_mode (h, DC_PRED8x8);
  }

  return 0;
}

static int svq3_decode_slice_header

(

H264Context *

h

)

[static]

Definition at line 682 of file svq3.c.

References MpegEncContext::adaptive_quant, av_log(), av_log2(), AV_LOG_ERROR, MpegEncContext::avctx, GetBitContext::buffer, MpegEncContext::gb, get_bits(), get_bits1(), get_bits_count(), golomb_to_pict_type, H264Context::intra4x4_pred_mode, INVALID_VLC, MpegEncContext::mb_num, MpegEncContext::mb_skip_run, MpegEncContext::mb_stride, MpegEncContext::mb_width, MpegEncContext::mb_x, H264Context::mb_xy, MpegEncContext::mb_y, H264Context::next_slice_index, MpegEncContext::qscale, H264Context::s, show_bits(), GetBitContext::size_in_bits, skip_bits(), skip_bits1(), H264Context::slice_num, H264Context::slice_type, svq3_get_ue_golomb(), and H264Context::unknown_svq3_flag.

Referenced by svq3_decode_frame().

                                                     {
  MpegEncContext *const s = (MpegEncContext *) h;
  const int mb_xy = h->mb_xy;
  int i, header;

  header = get_bits (&s->gb, 8);

  if (((header & 0x9F) != 1 && (header & 0x9F) != 2) || (header & 0x60) == 0) {
    /* TODO: what? */
    av_log(h->s.avctx, AV_LOG_ERROR, "unsupported slice header (%02X)\n", header);
    return -1;
  } else {
    int length = (header >> 5) & 3;

    h->next_slice_index = get_bits_count(&s->gb) + 8*show_bits (&s->gb, 8*length) + 8*length;

    if (h->next_slice_index > s->gb.size_in_bits){
      av_log(h->s.avctx, AV_LOG_ERROR, "slice after bitstream end\n");
      return -1;
    }

    s->gb.size_in_bits = h->next_slice_index - 8*(length - 1);
    skip_bits(&s->gb, 8);

    if (length > 0) {
      memcpy ((uint8_t *) &s->gb.buffer[get_bits_count(&s->gb) >> 3],
             &s->gb.buffer[s->gb.size_in_bits >> 3], (length - 1));
    }
  }

  if ((i = svq3_get_ue_golomb (&s->gb)) == INVALID_VLC || i >= 3){
    av_log(h->s.avctx, AV_LOG_ERROR, "illegal slice type %d \n", i);
    return -1;
  }

  h->slice_type = golomb_to_pict_type[i];

  if ((header & 0x9F) == 2) {
    i = (s->mb_num < 64) ? 6 : (1 + av_log2 (s->mb_num - 1));
    s->mb_skip_run = get_bits (&s->gb, i) - (s->mb_x + (s->mb_y * s->mb_width));
  } else {
    skip_bits1 (&s->gb);
    s->mb_skip_run = 0;
  }

  h->slice_num = get_bits (&s->gb, 8);
  s->qscale = get_bits (&s->gb, 5);
  s->adaptive_quant = get_bits1 (&s->gb);

  /* unknown fields */
  skip_bits1 (&s->gb);

  if (h->unknown_svq3_flag) {
    skip_bits1 (&s->gb);
  }

  skip_bits1 (&s->gb);
  skip_bits (&s->gb, 2);

  while (get_bits1 (&s->gb)) {
    skip_bits (&s->gb, 8);
  }

  /* reset intra predictors and invalidate motion vector references */
  if (s->mb_x > 0) {
    memset (h->intra4x4_pred_mode[mb_xy - 1], -1, 4*sizeof(int8_t));
    memset (h->intra4x4_pred_mode[mb_xy - s->mb_x], -1, 8*sizeof(int8_t)*s->mb_x);
  }
  if (s->mb_y > 0) {
    memset (h->intra4x4_pred_mode[mb_xy - s->mb_stride], -1, 8*sizeof(int8_t)*(s->mb_width - s->mb_x));

    if (s->mb_x > 0) {
      h->intra4x4_pred_mode[mb_xy - s->mb_stride - 1][3] = -1;
    }
  }

  return 0;
}

static void svq3_luma_dc_dequant_idct_c	(	DCTELEM *	block,
		int	qp
	)			[static]

Definition at line 111 of file svq3.c.

References offset, stride, and svq3_dequant_coeff.

                                                               {
    const int qmul= svq3_dequant_coeff[qp];
#define stride 16
    int i;
    int temp[16];
    static const int x_offset[4]={0, 1*stride, 4* stride,  5*stride};
    static const int y_offset[4]={0, 2*stride, 8* stride, 10*stride};

    for(i=0; i<4; i++){
        const int offset= y_offset[i];
        const int z0= 13*(block[offset+stride*0] +    block[offset+stride*4]);
        const int z1= 13*(block[offset+stride*0] -    block[offset+stride*4]);
        const int z2=  7* block[offset+stride*1] - 17*block[offset+stride*5];
        const int z3= 17* block[offset+stride*1] +  7*block[offset+stride*5];

        temp[4*i+0]= z0+z3;
        temp[4*i+1]= z1+z2;
        temp[4*i+2]= z1-z2;
        temp[4*i+3]= z0-z3;
    }

    for(i=0; i<4; i++){
        const int offset= x_offset[i];
        const int z0= 13*(temp[4*0+i] +    temp[4*2+i]);
        const int z1= 13*(temp[4*0+i] -    temp[4*2+i]);
        const int z2=  7* temp[4*1+i] - 17*temp[4*3+i];
        const int z3= 17* temp[4*1+i] +  7*temp[4*3+i];

        block[stride*0 +offset]= ((z0 + z3)*qmul + 0x80000)>>20;
        block[stride*2 +offset]= ((z1 + z2)*qmul + 0x80000)>>20;
        block[stride*8 +offset]= ((z1 - z2)*qmul + 0x80000)>>20;
        block[stride*10+offset]= ((z0 - z3)*qmul + 0x80000)>>20;
    }
}

static int svq3_mc_dir	(	H264Context *	h,
		int	size,
		int	mode,
		int	dir,
		int	avg
	)			[inline, static]

Definition at line 302 of file svq3.c.

References av_clip(), av_log(), AV_LOG_ERROR, MpegEncContext::avctx, H264Context::b_stride, MpegEncContext::current_picture, fill_rectangle(), H264Context::frame_num_offset, MpegEncContext::gb, MpegEncContext::h_edge_pos, HALFPEL_MODE, INVALID_VLC, MpegEncContext::mb_x, MpegEncContext::mb_y, mv, MpegEncContext::next_picture, pack16to32(), pred_motion(), PREDICT_MODE, H264Context::prev_frame_num_offset, H264Context::s, scan8, svq3_get_se_golomb(), svq3_mc_dir_part(), THIRDPEL_MODE, and MpegEncContext::v_edge_pos.

Referenced by svq3_decode_mb().

                                                                                     {

  int i, j, k, mx, my, dx, dy, x, y;
  MpegEncContext *const s = (MpegEncContext *) h;
  const int part_width  = ((size & 5) == 4) ? 4 : 16 >> (size & 1);
  const int part_height = 16 >> ((unsigned) (size + 1) / 3);
  const int extra_width = (mode == PREDICT_MODE) ? -16*6 : 0;
  const int h_edge_pos  = 6*(s->h_edge_pos - part_width ) - extra_width;
  const int v_edge_pos  = 6*(s->v_edge_pos - part_height) - extra_width;

  for (i=0; i < 16; i+=part_height) {
    for (j=0; j < 16; j+=part_width) {
      const int b_xy = (4*s->mb_x+(j>>2)) + (4*s->mb_y+(i>>2))*h->b_stride;
      int dxy;
      x = 16*s->mb_x + j;
      y = 16*s->mb_y + i;
      k = ((j>>2)&1) + ((i>>1)&2) + ((j>>1)&4) + (i&8);

      if (mode != PREDICT_MODE) {
        pred_motion (h, k, (part_width >> 2), dir, 1, &mx, &my);
      } else {
        mx = s->next_picture.motion_val[0][b_xy][0]<<1;
        my = s->next_picture.motion_val[0][b_xy][1]<<1;

        if (dir == 0) {
          mx = ((mx * h->frame_num_offset) / h->prev_frame_num_offset + 1)>>1;
          my = ((my * h->frame_num_offset) / h->prev_frame_num_offset + 1)>>1;
        } else {
          mx = ((mx * (h->frame_num_offset - h->prev_frame_num_offset)) / h->prev_frame_num_offset + 1)>>1;
          my = ((my * (h->frame_num_offset - h->prev_frame_num_offset)) / h->prev_frame_num_offset + 1)>>1;
        }
      }

      /* clip motion vector prediction to frame border */
      mx = av_clip (mx, extra_width - 6*x, h_edge_pos - 6*x);
      my = av_clip (my, extra_width - 6*y, v_edge_pos - 6*y);

      /* get (optional) motion vector differential */
      if (mode == PREDICT_MODE) {
        dx = dy = 0;
      } else {
        dy = svq3_get_se_golomb (&s->gb);
        dx = svq3_get_se_golomb (&s->gb);

        if (dx == INVALID_VLC || dy == INVALID_VLC) {
          av_log(h->s.avctx, AV_LOG_ERROR, "invalid MV vlc\n");
          return -1;
        }
      }

      /* compute motion vector */
      if (mode == THIRDPEL_MODE) {
        int fx, fy;
        mx = ((mx + 1)>>1) + dx;
        my = ((my + 1)>>1) + dy;
        fx= ((unsigned)(mx + 0x3000))/3 - 0x1000;
        fy= ((unsigned)(my + 0x3000))/3 - 0x1000;
        dxy= (mx - 3*fx) + 4*(my - 3*fy);

        svq3_mc_dir_part (s, x, y, part_width, part_height, fx, fy, dxy, 1, dir, avg);
        mx += mx;
        my += my;
      } else if (mode == HALFPEL_MODE || mode == PREDICT_MODE) {
        mx = ((unsigned)(mx + 1 + 0x3000))/3 + dx - 0x1000;
        my = ((unsigned)(my + 1 + 0x3000))/3 + dy - 0x1000;
        dxy= (mx&1) + 2*(my&1);

        svq3_mc_dir_part (s, x, y, part_width, part_height, mx>>1, my>>1, dxy, 0, dir, avg);
        mx *= 3;
        my *= 3;
      } else {
        mx = ((unsigned)(mx + 3 + 0x6000))/6 + dx - 0x1000;
        my = ((unsigned)(my + 3 + 0x6000))/6 + dy - 0x1000;

        svq3_mc_dir_part (s, x, y, part_width, part_height, mx, my, 0, 0, dir, avg);
        mx *= 6;
        my *= 6;
      }

      /* update mv_cache */
      if (mode != PREDICT_MODE) {
        int32_t mv = pack16to32(mx,my);

        if (part_height == 8 && i < 8) {
          *(int32_t *) h->mv_cache[dir][scan8[k] + 1*8] = mv;

          if (part_width == 8 && j < 8) {
            *(int32_t *) h->mv_cache[dir][scan8[k] + 1 + 1*8] = mv;
          }
        }
        if (part_width == 8 && j < 8) {
          *(int32_t *) h->mv_cache[dir][scan8[k] + 1] = mv;
        }
        if (part_width == 4 || part_height == 4) {
          *(int32_t *) h->mv_cache[dir][scan8[k]] = mv;
        }
      }

      /* write back motion vectors */
      fill_rectangle