slice.c

VLC Player Source Code

    NEEDBITS (bit_buf, bits, bit_ptr);					      \
    motion_y = motion->pmv[0][1] + get_motion_delta (decoder,		      \
						     motion->f_code[1]);      \
    motion_y = bound_motion_vector (motion_y, motion->f_code[1]);	      \
    motion->pmv[1][1] = motion->pmv[0][1] = motion_y;			      \
									      \
    MOTION (table, ref_field, motion_x, motion_y, 16, 0);		      \
}									      \
									      \
static void motion_fi_16x8_##FORMAT (mpeg2_decoder_t * const decoder,	      \
				     motion_t * const motion,		      \
				     mpeg2_mc_fct * const * const table)      \
{									      \
    int motion_x, motion_y;						      \
    uint8_t ** ref_field;						      \
    unsigned int pos_x, pos_y, xy_half, offset;				      \
									      \
    NEEDBITS (bit_buf, bits, bit_ptr);					      \
    ref_field = motion->ref2[UBITS (bit_buf, 1)];			      \
    DUMPBITS (bit_buf, bits, 1);					      \
									      \
    motion_x = motion->pmv[0][0] + get_motion_delta (decoder,		      \
						     motion->f_code[0]);      \
    motion_x = bound_motion_vector (motion_x, motion->f_code[0]);	      \
    motion->pmv[0][0] = motion_x;					      \
									      \
    NEEDBITS (bit_buf, bits, bit_ptr);					      \
    motion_y = motion->pmv[0][1] + get_motion_delta (decoder,		      \
						     motion->f_code[1]);      \
    motion_y = bound_motion_vector (motion_y, motion->f_code[1]);	      \
    motion->pmv[0][1] = motion_y;					      \
									      \
    MOTION (table, ref_field, motion_x, motion_y, 8, 0);		      \
									      \
    NEEDBITS (bit_buf, bits, bit_ptr);					      \
    ref_field = motion->ref2[UBITS (bit_buf, 1)];			      \
    DUMPBITS (bit_buf, bits, 1);					      \
									      \
    motion_x = motion->pmv[1][0] + get_motion_delta (decoder,		      \
						     motion->f_code[0]);      \
    motion_x = bound_motion_vector (motion_x, motion->f_code[0]);	      \
    motion->pmv[1][0] = motion_x;					      \
									      \
    NEEDBITS (bit_buf, bits, bit_ptr);					      \
    motion_y = motion->pmv[1][1] + get_motion_delta (decoder,		      \
						     motion->f_code[1]);      \
    motion_y = bound_motion_vector (motion_y, motion->f_code[1]);	      \
    motion->pmv[1][1] = motion_y;					      \
									      \
    MOTION (table, ref_field, motion_x, motion_y, 8, 8);		      \
}									      \
									      \
static void motion_fi_dmv_##FORMAT (mpeg2_decoder_t * const decoder,	      \
				    motion_t * const motion,		      \
				    mpeg2_mc_fct * const * const table)	      \
{									      \
    int motion_x, motion_y, other_x, other_y;				      \
    unsigned int pos_x, pos_y, xy_half, offset;				      \
									      \
    NEEDBITS (bit_buf, bits, bit_ptr);					      \
    motion_x = motion->pmv[0][0] + get_motion_delta (decoder,		      \
						     motion->f_code[0]);      \
    motion_x = bound_motion_vector (motion_x, motion->f_code[0]);	      \
    motion->pmv[1][0] = motion->pmv[0][0] = motion_x;			      \
    NEEDBITS (bit_buf, bits, bit_ptr);					      \
    other_x = ((motion_x + (motion_x > 0)) >> 1) + get_dmv (decoder);	      \
									      \
    motion_y = motion->pmv[0][1] + get_motion_delta (decoder,		      \
						     motion->f_code[1]);      \
    motion_y = bound_motion_vector (motion_y, motion->f_code[1]);	      \
    motion->pmv[1][1] = motion->pmv[0][1] = motion_y;			      \
    other_y = (((motion_y + (motion_y > 0)) >> 1) + get_dmv (decoder) +	      \
	       decoder->dmv_offset);					      \
									      \
    MOTION (mpeg2_mc.put, motion->ref[0], motion_x, motion_y, 16, 0);	      \
    MOTION (mpeg2_mc.avg, motion->ref[1], other_x, other_y, 16, 0);	      \
}									      \

MOTION_FUNCTIONS (420, MOTION_420, MOTION_FIELD_420, MOTION_DMV_420,
		  MOTION_ZERO_420)
MOTION_FUNCTIONS (422, MOTION_422, MOTION_FIELD_422, MOTION_DMV_422,
		  MOTION_ZERO_422)
MOTION_FUNCTIONS (444, MOTION_444, MOTION_FIELD_444, MOTION_DMV_444,
		  MOTION_ZERO_444)

/* like motion_frame, but parsing without actual motion compensation */
static void motion_fr_conceal (mpeg2_decoder_t * const decoder)
{
    int tmp;

    NEEDBITS (bit_buf, bits, bit_ptr);
    tmp = (decoder->f_motion.pmv[0][0] +
           get_motion_delta (decoder, decoder->f_motion.f_code[0]));
    tmp = bound_motion_vector (tmp, decoder->f_motion.f_code[0]);
    decoder->f_motion.pmv[1][0] = decoder->f_motion.pmv[0][0] = tmp;

    NEEDBITS (bit_buf, bits, bit_ptr);
    tmp = (decoder->f_motion.pmv[0][1] +
           get_motion_delta (decoder, decoder->f_motion.f_code[1]));
    tmp = bound_motion_vector (tmp, decoder->f_motion.f_code[1]);
    decoder->f_motion.pmv[1][1] = decoder->f_motion.pmv[0][1] = tmp;

    DUMPBITS (bit_buf, bits, 1); /* remove marker_bit */
}

static void motion_fi_conceal (mpeg2_decoder_t * const decoder)
{
    int tmp;

    NEEDBITS (bit_buf, bits, bit_ptr);
    DUMPBITS (bit_buf, bits, 1); /* remove field_select */

    tmp = (decoder->f_motion.pmv[0][0] +
           get_motion_delta (decoder, decoder->f_motion.f_code[0]));
    tmp = bound_motion_vector (tmp, decoder->f_motion.f_code[0]);
    decoder->f_motion.pmv[1][0] = decoder->f_motion.pmv[0][0] = tmp;

    NEEDBITS (bit_buf, bits, bit_ptr);
    tmp = (decoder->f_motion.pmv[0][1] +
           get_motion_delta (decoder, decoder->f_motion.f_code[1]));
    tmp = bound_motion_vector (tmp, decoder->f_motion.f_code[1]);
    decoder->f_motion.pmv[1][1] = decoder->f_motion.pmv[0][1] = tmp;

    DUMPBITS (bit_buf, bits, 1); /* remove marker_bit */
}

#undef bit_buf
#undef bits
#undef bit_ptr

#define MOTION_CALL(routine,direction)				\
do {								\
    if ((direction) & MACROBLOCK_MOTION_FORWARD)		\
	routine (decoder, &(decoder->f_motion), mpeg2_mc.put);	\
    if ((direction) & MACROBLOCK_MOTION_BACKWARD)		\
	routine (decoder, &(decoder->b_motion),			\
		 ((direction) & MACROBLOCK_MOTION_FORWARD ?	\
		  mpeg2_mc.avg : mpeg2_mc.put));		\
} while (0)

#define NEXT_MACROBLOCK							\
do {									\
    decoder->offset += 16;						\
    if (decoder->offset == decoder->width) {				\
	do { /* just so we can use the break statement */		\
	    if (decoder->convert) {					\
		decoder->convert (decoder->convert_id, decoder->dest,	\
				  decoder->v_offset);			\
		if (decoder->coding_type == B_TYPE)			\
		    break;						\
	    }								\
	    decoder->dest[0] += decoder->slice_stride;			\
	    decoder->dest[1] += decoder->slice_uv_stride;		\
	    decoder->dest[2] += decoder->slice_uv_stride;		\
	} while (0);							\
	decoder->v_offset += 16;					\
	if (decoder->v_offset > decoder->limit_y) {			\
	    if (mpeg2_cpu_state_restore)				\
		mpeg2_cpu_state_restore (&cpu_state);			\
	    return;							\
	}								\
	decoder->offset = 0;						\
    }									\
} while (0)

void mpeg2_init_fbuf (mpeg2_decoder_t * decoder, uint8_t * current_fbuf[3],
		      uint8_t * forward_fbuf[3], uint8_t * backward_fbuf[3])
{
    int offset, stride, height, bottom_field;

    stride = decoder->stride_frame;
    bottom_field = (decoder->picture_structure == BOTTOM_FIELD);
    offset = bottom_field ? stride : 0;
    height = decoder->height;

    decoder->picture_dest[0] = current_fbuf[0] + offset;
    decoder->picture_dest[1] = current_fbuf[1] + (offset >> 1);
    decoder->picture_dest[2] = current_fbuf[2] + (offset >> 1);

    decoder->f_motion.ref[0][0] = forward_fbuf[0] + offset;
    decoder->f_motion.ref[0][1] = forward_fbuf[1] + (offset >> 1);
    decoder->f_motion.ref[0][2] = forward_fbuf[2] + (offset >> 1);

    decoder->b_motion.ref[0][0] = backward_fbuf[0] + offset;
    decoder->b_motion.ref[0][1] = backward_fbuf[1] + (offset >> 1);
    decoder->b_motion.ref[0][2] = backward_fbuf[2] + (offset >> 1);

    if( decoder->picture_structure != FRAME_PICTURE )
    {
        decoder->dmv_offset = bottom_field ? 1 : -1;
        decoder->f_motion.ref2[0] = decoder->f_motion.ref[bottom_field];
        decoder->f_motion.ref2[1] = decoder->f_motion.ref[!bottom_field];
        decoder->b_motion.ref2[0] = decoder->b_motion.ref[bottom_field];
        decoder->b_motion.ref2[1] = decoder->b_motion.ref[!bottom_field];
        offset = stride - offset;

        if( decoder->second_field && (decoder->coding_type != B_TYPE) )
            forward_fbuf = current_fbuf;

        decoder->f_motion.ref[1][0] = forward_fbuf[0] + offset;
        decoder->f_motion.ref[1][1] = forward_fbuf[1] + (offset >> 1);
        decoder->f_motion.ref[1][2] = forward_fbuf[2] + (offset >> 1);

        decoder->b_motion.ref[1][0] = backward_fbuf[0] + offset;
        decoder->b_motion.ref[1][1] = backward_fbuf[1] + (offset >> 1);
        decoder->b_motion.ref[1][2] = backward_fbuf[2] + (offset >> 1);

        stride <<= 1;
        height >>= 1;
    }

    decoder->stride = stride;
    decoder->uv_stride = stride >> 1;
    decoder->slice_stride = 16 * stride;
    decoder->slice_uv_stride =
    decoder->slice_stride >> (2 - decoder->chroma_format);
    decoder->limit_x = 2 * decoder->width - 32;
    decoder->limit_y_16 = 2 * height - 32;
    decoder->limit_y_8 = 2 * height - 16;
    decoder->limit_y = height - 16;

    if( decoder->mpeg1 )
    {
        decoder->motion_parser[0] = motion_zero_420;
        decoder->motion_parser[MC_FRAME] = motion_mp1;
        decoder->motion_parser[4] = motion_reuse_420;
    }
    else if( decoder->picture_structure == FRAME_PICTURE )
    {
        if (decoder->chroma_format == 0)
        {
            decoder->motion_parser[0] = motion_zero_420;
            decoder->motion_parser[MC_FIELD] = motion_fr_field_420;
            decoder->motion_parser[MC_FRAME] = motion_fr_frame_420;
            decoder->motion_parser[MC_DMV] = motion_fr_dmv_420;
            decoder->motion_parser[4] = motion_reuse_420;
        }
        else if (decoder->chroma_format == 1)
        {
            decoder->motion_parser[0] = motion_zero_422;
            decoder->motion_parser[MC_FIELD] = motion_fr_field_422;
            decoder->motion_parser[MC_FRAME] = motion_fr_frame_422;
            decoder->motion_parser[MC_DMV] = motion_fr_dmv_422;
            decoder->motion_parser[4] = motion_reuse_422;
        } else
        {
            decoder->motion_parser[0] = motion_zero_444;
            decoder->motion_parser[MC_FIELD] = motion_fr_field_444;
            decoder->motion_parser[MC_FRAME] = motion_fr_frame_444;
            decoder->motion_parser[MC_DMV] = motion_fr_dmv_444;
            decoder->motion_parser[4] = motion_reuse_444;
        }
    }
    else
    {
        if (decoder->chroma_format == 0)
        {
            decoder->motion_parser[0] = motion_zero_420;
            decoder->motion_parser[MC_FIELD] = motion_fi_field_420;
            decoder->motion_parser[MC_16X8] = motion_fi_16x8_420;
            decoder->motion_parser[MC_DMV] = motion_fi_dmv_420;
            decoder->motion_parser[4] = motion_reuse_420;
        }
        else if (decoder->chroma_format == 1)
        {
            decoder->motion_parser[0] = motion_zero_422;
            decoder->motion_parser[MC_FIELD] = motion_fi_field_422;
            decoder->motion_parser[MC_16X8] = motion_fi_16x8_422;
            decoder->motion_parser[MC_DMV] = motion_fi_dmv_422;
            decoder->motion_parser[4] = motion_reuse_422;
        }
        else
        {
            decoder->motion_parser[0] = motion_zero_444;
            decoder->motion_parser[MC_FIELD] = motion_fi_field_444;
            decoder->motion_parser[MC_16X8] = motion_fi_16x8_444;
            decoder->motion_parser[MC_DMV] = motion_fi_dmv_444;
            decoder->motion_parser[4] = motion_reuse_444;
        }
    }
}