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Diffstat (limited to 'src/video_dec/libmpeg2/slice.c')
-rw-r--r--src/video_dec/libmpeg2/slice.c1833
1 files changed, 1833 insertions, 0 deletions
diff --git a/src/video_dec/libmpeg2/slice.c b/src/video_dec/libmpeg2/slice.c
new file mode 100644
index 000000000..8247a9a24
--- /dev/null
+++ b/src/video_dec/libmpeg2/slice.c
@@ -0,0 +1,1833 @@
+/*
+ * slice.c
+ * Copyright (C) 2000-2002 Michel Lespinasse <walken@zoy.org>
+ * Copyright (C) 1999-2000 Aaron Holtzman <aholtzma@ess.engr.uvic.ca>
+ *
+ * This file is part of mpeg2dec, a free MPEG-2 video stream decoder.
+ * See http://libmpeg2.sourceforge.net/ for updates.
+ *
+ * mpeg2dec is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * mpeg2dec is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#include "config.h"
+
+#include <inttypes.h>
+
+#include <xine/xine_internal.h>
+#include <xine/video_out.h>
+#include "mpeg2_internal.h"
+#include <xine/attributes.h>
+
+#include "vlc.h"
+
+static const int non_linear_quantizer_scale [] = {
+ 0, 1, 2, 3, 4, 5, 6, 7,
+ 8, 10, 12, 14, 16, 18, 20, 22,
+ 24, 28, 32, 36, 40, 44, 48, 52,
+ 56, 64, 72, 80, 88, 96, 104, 112
+};
+
+static inline int get_macroblock_modes (picture_t * picture)
+{
+#define bit_buf (picture->bitstream_buf)
+#define bits (picture->bitstream_bits)
+#define bit_ptr (picture->bitstream_ptr)
+ int macroblock_modes;
+ const MBtab * tab;
+
+ switch (picture->picture_coding_type) {
+ case I_TYPE:
+
+ tab = MB_I + UBITS (bit_buf, 1);
+ DUMPBITS (bit_buf, bits, tab->len);
+ macroblock_modes = tab->modes;
+
+ if ((! (picture->frame_pred_frame_dct)) &&
+ (picture->picture_structure == FRAME_PICTURE)) {
+ macroblock_modes |= UBITS (bit_buf, 1) * DCT_TYPE_INTERLACED;
+ DUMPBITS (bit_buf, bits, 1);
+ }
+
+ return macroblock_modes;
+
+ case P_TYPE:
+
+ tab = MB_P + UBITS (bit_buf, 5);
+ DUMPBITS (bit_buf, bits, tab->len);
+ macroblock_modes = tab->modes;
+
+ if (picture->picture_structure != FRAME_PICTURE) {
+ if (macroblock_modes & MACROBLOCK_MOTION_FORWARD) {
+ macroblock_modes |= UBITS (bit_buf, 2) * MOTION_TYPE_BASE;
+ DUMPBITS (bit_buf, bits, 2);
+ }
+ return macroblock_modes;
+ } else if (picture->frame_pred_frame_dct) {
+ if (macroblock_modes & MACROBLOCK_MOTION_FORWARD)
+ macroblock_modes |= MC_FRAME;
+ return macroblock_modes;
+ } else {
+ if (macroblock_modes & MACROBLOCK_MOTION_FORWARD) {
+ macroblock_modes |= UBITS (bit_buf, 2) * MOTION_TYPE_BASE;
+ DUMPBITS (bit_buf, bits, 2);
+ }
+ if (macroblock_modes & (MACROBLOCK_INTRA | MACROBLOCK_PATTERN)) {
+ macroblock_modes |= UBITS (bit_buf, 1) * DCT_TYPE_INTERLACED;
+ DUMPBITS (bit_buf, bits, 1);
+ }
+ return macroblock_modes;
+ }
+
+ case B_TYPE:
+
+ tab = MB_B + UBITS (bit_buf, 6);
+ DUMPBITS (bit_buf, bits, tab->len);
+ macroblock_modes = tab->modes;
+
+ if (picture->picture_structure != FRAME_PICTURE) {
+ if (! (macroblock_modes & MACROBLOCK_INTRA)) {
+ macroblock_modes |= UBITS (bit_buf, 2) * MOTION_TYPE_BASE;
+ DUMPBITS (bit_buf, bits, 2);
+ }
+ return macroblock_modes;
+ } else if (picture->frame_pred_frame_dct) {
+ /* if (! (macroblock_modes & MACROBLOCK_INTRA)) */
+ macroblock_modes |= MC_FRAME;
+ return macroblock_modes;
+ } else {
+ if (macroblock_modes & MACROBLOCK_INTRA)
+ goto intra;
+ macroblock_modes |= UBITS (bit_buf, 2) * MOTION_TYPE_BASE;
+ DUMPBITS (bit_buf, bits, 2);
+ if (macroblock_modes & (MACROBLOCK_INTRA | MACROBLOCK_PATTERN)) {
+ intra:
+ macroblock_modes |= UBITS (bit_buf, 1) * DCT_TYPE_INTERLACED;
+ DUMPBITS (bit_buf, bits, 1);
+ }
+ return macroblock_modes;
+ }
+
+ case D_TYPE:
+
+ DUMPBITS (bit_buf, bits, 1);
+ return MACROBLOCK_INTRA;
+
+ default:
+ return 0;
+ }
+#undef bit_buf
+#undef bits
+#undef bit_ptr
+}
+
+static inline int get_quantizer_scale (picture_t * picture)
+{
+#define bit_buf (picture->bitstream_buf)
+#define bits (picture->bitstream_bits)
+#define bit_ptr (picture->bitstream_ptr)
+
+ int quantizer_scale_code;
+
+ quantizer_scale_code = UBITS (bit_buf, 5);
+ DUMPBITS (bit_buf, bits, 5);
+
+ if (picture->q_scale_type)
+ return non_linear_quantizer_scale [quantizer_scale_code];
+ else
+ return quantizer_scale_code << 1;
+#undef bit_buf
+#undef bits
+#undef bit_ptr
+}
+
+static inline int get_motion_delta (picture_t * picture, int f_code)
+{
+#define bit_buf (picture->bitstream_buf)
+#define bits (picture->bitstream_bits)
+#define bit_ptr (picture->bitstream_ptr)
+
+ int delta;
+ int sign;
+ const MVtab * tab;
+
+ if (bit_buf & 0x80000000) {
+ DUMPBITS (bit_buf, bits, 1);
+ return 0;
+ } else if (bit_buf >= 0x0c000000) {
+
+ tab = MV_4 + UBITS (bit_buf, 4);
+ delta = (tab->delta << f_code) + 1;
+ bits += tab->len + f_code + 1;
+ bit_buf <<= tab->len;
+
+ sign = SBITS (bit_buf, 1);
+ bit_buf <<= 1;
+
+ if (f_code)
+ delta += UBITS (bit_buf, f_code);
+ bit_buf <<= f_code;
+
+ return (delta ^ sign) - sign;
+
+ } else {
+
+ tab = MV_10 + UBITS (bit_buf, 10);
+ delta = (tab->delta << f_code) + 1;
+ bits += tab->len + 1;
+ bit_buf <<= tab->len;
+
+ sign = SBITS (bit_buf, 1);
+ bit_buf <<= 1;
+
+ if (f_code) {
+ NEEDBITS (bit_buf, bits, bit_ptr);
+ delta += UBITS (bit_buf, f_code);
+ DUMPBITS (bit_buf, bits, f_code);
+ }
+
+ return (delta ^ sign) - sign;
+
+ }
+#undef bit_buf
+#undef bits
+#undef bit_ptr
+}
+
+static inline int bound_motion_vector (int vec, int f_code)
+{
+#if 1
+ unsigned int limit;
+ int sign;
+
+ limit = 16 << f_code;
+
+ if ((unsigned int)(vec + limit) < 2 * limit)
+ return vec;
+ else {
+ sign = ((int32_t)vec) >> 31;
+ return vec - ((2 * limit) ^ sign) + sign;
+ }
+#else
+ return ((int32_t)vector << (27 - f_code)) >> (27 - f_code);
+#endif
+}
+
+static inline int get_dmv (picture_t * picture)
+{
+#define bit_buf (picture->bitstream_buf)
+#define bits (picture->bitstream_bits)
+#define bit_ptr (picture->bitstream_ptr)
+
+ const DMVtab * tab;
+
+ tab = DMV_2 + UBITS (bit_buf, 2);
+ DUMPBITS (bit_buf, bits, tab->len);
+ return tab->dmv;
+#undef bit_buf
+#undef bits
+#undef bit_ptr
+}
+
+static inline int get_coded_block_pattern (picture_t * picture)
+{
+#define bit_buf (picture->bitstream_buf)
+#define bits (picture->bitstream_bits)
+#define bit_ptr (picture->bitstream_ptr)
+
+ const CBPtab * tab;
+
+ NEEDBITS (bit_buf, bits, bit_ptr);
+
+ if (bit_buf >= 0x20000000) {
+
+ tab = CBP_7 + (UBITS (bit_buf, 7) - 16);
+ DUMPBITS (bit_buf, bits, tab->len);
+ return tab->cbp;
+
+ } else {
+
+ tab = CBP_9 + UBITS (bit_buf, 9);
+ DUMPBITS (bit_buf, bits, tab->len);
+ return tab->cbp;
+ }
+
+#undef bit_buf
+#undef bits
+#undef bit_ptr
+}
+
+static inline int get_luma_dc_dct_diff (picture_t * picture)
+{
+#define bit_buf (picture->bitstream_buf)
+#define bits (picture->bitstream_bits)
+#define bit_ptr (picture->bitstream_ptr)
+ const DCtab * tab;
+ int size;
+ int dc_diff;
+
+ if (bit_buf < 0xf8000000) {
+ tab = DC_lum_5 + UBITS (bit_buf, 5);
+ size = tab->size;
+ if (size) {
+ bits += tab->len + size;
+ bit_buf <<= tab->len;
+ dc_diff =
+ UBITS (bit_buf, size) - UBITS (SBITS (~bit_buf, 1), size);
+ bit_buf <<= size;
+ return dc_diff;
+ } else {
+ DUMPBITS (bit_buf, bits, 3);
+ return 0;
+ }
+ } else {
+ tab = DC_long + (UBITS (bit_buf, 9) - 0x1e0);
+ size = tab->size;
+ DUMPBITS (bit_buf, bits, tab->len);
+ NEEDBITS (bit_buf, bits, bit_ptr);
+ dc_diff = UBITS (bit_buf, size) - UBITS (SBITS (~bit_buf, 1), size);
+ DUMPBITS (bit_buf, bits, size);
+ return dc_diff;
+ }
+#undef bit_buf
+#undef bits
+#undef bit_ptr
+}
+
+static inline int get_chroma_dc_dct_diff (picture_t * picture)
+{
+#define bit_buf (picture->bitstream_buf)
+#define bits (picture->bitstream_bits)
+#define bit_ptr (picture->bitstream_ptr)
+ const DCtab * tab;
+ int size;
+ int dc_diff;
+
+ if (bit_buf < 0xf8000000) {
+ tab = DC_chrom_5 + UBITS (bit_buf, 5);
+ size = tab->size;
+ if (size) {
+ bits += tab->len + size;
+ bit_buf <<= tab->len;
+ dc_diff =
+ UBITS (bit_buf, size) - UBITS (SBITS (~bit_buf, 1), size);
+ bit_buf <<= size;
+ return dc_diff;
+ } else {
+ DUMPBITS (bit_buf, bits, 2);
+ return 0;
+ }
+ } else {
+ tab = DC_long + (UBITS (bit_buf, 10) - 0x3e0);
+ size = tab->size;
+ DUMPBITS (bit_buf, bits, tab->len + 1);
+ NEEDBITS (bit_buf, bits, bit_ptr);
+ dc_diff = UBITS (bit_buf, size) - UBITS (SBITS (~bit_buf, 1), size);
+ DUMPBITS (bit_buf, bits, size);
+ return dc_diff;
+ }
+#undef bit_buf
+#undef bits
+#undef bit_ptr
+}
+
+#define SATURATE(val) \
+do { \
+ if ((uint32_t)(val + 2048) > 4095) \
+ val = (val > 0) ? 2047 : -2048; \
+} while (0)
+
+static void get_intra_block_B14 (picture_t * picture)
+{
+ int i;
+ int j;
+ int val;
+ uint8_t * scan = picture->scan;
+ uint8_t * quant_matrix = picture->intra_quantizer_matrix;
+ int quantizer_scale = picture->quantizer_scale;
+ int mismatch;
+ const DCTtab * tab;
+ uint32_t bit_buf;
+ int bits;
+ uint8_t * bit_ptr;
+ int16_t * dest;
+
+ dest = picture->DCTblock;
+ i = 0;
+ mismatch = ~dest[0];
+
+ bit_buf = picture->bitstream_buf;
+ bits = picture->bitstream_bits;
+ bit_ptr = picture->bitstream_ptr;
+
+ NEEDBITS (bit_buf, bits, bit_ptr);
+
+ while (1) {
+ if (bit_buf >= 0x28000000) {
+
+ tab = DCT_B14AC_5 + (UBITS (bit_buf, 5) - 5);
+
+ i += tab->run;
+ if (i >= 64)
+ break; /* end of block */
+
+ normal_code:
+ j = scan[i];
+ bit_buf <<= tab->len;
+ bits += tab->len + 1;
+ val = (tab->level * quantizer_scale * quant_matrix[j]) >> 4;
+
+ /* if (bitstream_get (1)) val = -val; */
+ val = (val ^ SBITS (bit_buf, 1)) - SBITS (bit_buf, 1);
+
+ SATURATE (val);
+ dest[j] = val;
+ mismatch ^= val;
+
+ bit_buf <<= 1;
+ NEEDBITS (bit_buf, bits, bit_ptr);
+
+ continue;
+
+ } else if (bit_buf >= 0x04000000) {
+
+ tab = DCT_B14_8 + (UBITS (bit_buf, 8) - 4);
+
+ i += tab->run;
+ if (i < 64)
+ goto normal_code;
+
+ /* escape code */
+
+ i += UBITS (bit_buf << 6, 6) - 64;
+ if (i >= 64)
+ break; /* illegal, check needed to avoid buffer overflow */
+
+ j = scan[i];
+
+ DUMPBITS (bit_buf, bits, 12);
+ NEEDBITS (bit_buf, bits, bit_ptr);
+ val = (SBITS (bit_buf, 12) *
+ quantizer_scale * quant_matrix[j]) / 16;
+
+ SATURATE (val);
+ dest[j] = val;
+ mismatch ^= val;
+
+ DUMPBITS (bit_buf, bits, 12);
+ NEEDBITS (bit_buf, bits, bit_ptr);
+
+ continue;
+
+ } else if (bit_buf >= 0x02000000) {
+ tab = DCT_B14_10 + (UBITS (bit_buf, 10) - 8);
+ i += tab->run;
+ if (i < 64)
+ goto normal_code;
+ } else if (bit_buf >= 0x00800000) {
+ tab = DCT_13 + (UBITS (bit_buf, 13) - 16);
+ i += tab->run;
+ if (i < 64)
+ goto normal_code;
+ } else if (bit_buf >= 0x00200000) {
+ tab = DCT_15 + (UBITS (bit_buf, 15) - 16);
+ i += tab->run;
+ if (i < 64)
+ goto normal_code;
+ } else {
+ tab = DCT_16 + UBITS (bit_buf, 16);
+ bit_buf <<= 16;
+ GETWORD (bit_buf, bits + 16, bit_ptr);
+ i += tab->run;
+ if (i < 64)
+ goto normal_code;
+ }
+ break; /* illegal, check needed to avoid buffer overflow */
+ }
+ dest[63] ^= mismatch & 1;
+ DUMPBITS (bit_buf, bits, 2); /* dump end of block code */
+ picture->bitstream_buf = bit_buf;
+ picture->bitstream_bits = bits;
+ picture->bitstream_ptr = bit_ptr;
+}
+
+static void get_intra_block_B15 (picture_t * picture)
+{
+ int i;
+ int j;
+ int val;
+ uint8_t * scan = picture->scan;
+ uint8_t * quant_matrix = picture->intra_quantizer_matrix;
+ int quantizer_scale = picture->quantizer_scale;
+ int mismatch;
+ const DCTtab * tab;
+ uint32_t bit_buf;
+ int bits;
+ uint8_t * bit_ptr;
+ int16_t * dest;
+
+ dest = picture->DCTblock;
+ i = 0;
+ mismatch = ~dest[0];
+
+ bit_buf = picture->bitstream_buf;
+ bits = picture->bitstream_bits;
+ bit_ptr = picture->bitstream_ptr;
+
+ NEEDBITS (bit_buf, bits, bit_ptr);
+
+ while (1) {
+ if (bit_buf >= 0x04000000) {
+
+ tab = DCT_B15_8 + (UBITS (bit_buf, 8) - 4);
+
+ i += tab->run;
+ if (i < 64) {
+
+ normal_code:
+ j = scan[i];
+ bit_buf <<= tab->len;
+ bits += tab->len + 1;
+ val = (tab->level * quantizer_scale * quant_matrix[j]) >> 4;
+
+ /* if (bitstream_get (1)) val = -val; */
+ val = (val ^ SBITS (bit_buf, 1)) - SBITS (bit_buf, 1);
+
+ SATURATE (val);
+ dest[j] = val;
+ mismatch ^= val;
+
+ bit_buf <<= 1;
+ NEEDBITS (bit_buf, bits, bit_ptr);
+
+ continue;
+
+ } else {
+
+ /* end of block. I commented out this code because if we */
+ /* dont exit here we will still exit at the later test :) */
+
+ /* if (i >= 128) break; */ /* end of block */
+
+ /* escape code */
+
+ i += UBITS (bit_buf << 6, 6) - 64;
+ if (i >= 64)
+ break; /* illegal, check against buffer overflow */
+
+ j = scan[i];
+
+ DUMPBITS (bit_buf, bits, 12);
+ NEEDBITS (bit_buf, bits, bit_ptr);
+ val = (SBITS (bit_buf, 12) *
+ quantizer_scale * quant_matrix[j]) / 16;
+
+ SATURATE (val);
+ dest[j] = val;
+ mismatch ^= val;
+
+ DUMPBITS (bit_buf, bits, 12);
+ NEEDBITS (bit_buf, bits, bit_ptr);
+
+ continue;
+
+ }
+ } else if (bit_buf >= 0x02000000) {
+ tab = DCT_B15_10 + (UBITS (bit_buf, 10) - 8);
+ i += tab->run;
+ if (i < 64)
+ goto normal_code;
+ } else if (bit_buf >= 0x00800000) {
+ tab = DCT_13 + (UBITS (bit_buf, 13) - 16);
+ i += tab->run;
+ if (i < 64)
+ goto normal_code;
+ } else if (bit_buf >= 0x00200000) {
+ tab = DCT_15 + (UBITS (bit_buf, 15) - 16);
+ i += tab->run;
+ if (i < 64)
+ goto normal_code;
+ } else {
+ tab = DCT_16 + UBITS (bit_buf, 16);
+ bit_buf <<= 16;
+ GETWORD (bit_buf, bits + 16, bit_ptr);
+ i += tab->run;
+ if (i < 64)
+ goto normal_code;
+ }
+ break; /* illegal, check needed to avoid buffer overflow */
+ }
+ dest[63] ^= mismatch & 1;
+ DUMPBITS (bit_buf, bits, 4); /* dump end of block code */
+ picture->bitstream_buf = bit_buf;
+ picture->bitstream_bits = bits;
+ picture->bitstream_ptr = bit_ptr;
+}
+
+static void get_non_intra_block (picture_t * picture)
+{
+ int i;
+ int j;
+ int val;
+ uint8_t * scan = picture->scan;
+ uint8_t * quant_matrix = picture->non_intra_quantizer_matrix;
+ int quantizer_scale = picture->quantizer_scale;
+ int mismatch;
+ const DCTtab * tab;
+ uint32_t bit_buf;
+ int bits;
+ uint8_t * bit_ptr;
+ int16_t * dest;
+
+ i = -1;
+ mismatch = 1;
+ dest = picture->DCTblock;
+
+ bit_buf = picture->bitstream_buf;
+ bits = picture->bitstream_bits;
+ bit_ptr = picture->bitstream_ptr;
+
+ NEEDBITS (bit_buf, bits, bit_ptr);
+ if (bit_buf >= 0x28000000) {
+ tab = DCT_B14DC_5 + (UBITS (bit_buf, 5) - 5);
+ goto entry_1;
+ } else
+ goto entry_2;
+
+ while (1) {
+ if (bit_buf >= 0x28000000) {
+
+ tab = DCT_B14AC_5 + (UBITS (bit_buf, 5) - 5);
+
+ entry_1:
+ i += tab->run;
+ if (i >= 64)
+ break; /* end of block */
+
+ normal_code:
+ j = scan[i];
+ bit_buf <<= tab->len;
+ bits += tab->len + 1;
+ val = ((2*tab->level+1) * quantizer_scale * quant_matrix[j]) >> 5;
+
+ /* if (bitstream_get (1)) val = -val; */
+ val = (val ^ SBITS (bit_buf, 1)) - SBITS (bit_buf, 1);
+
+ SATURATE (val);
+ dest[j] = val;
+ mismatch ^= val;
+
+ bit_buf <<= 1;
+ NEEDBITS (bit_buf, bits, bit_ptr);
+
+ continue;
+
+ }
+
+ entry_2:
+ if (bit_buf >= 0x04000000) {
+
+ tab = DCT_B14_8 + (UBITS (bit_buf, 8) - 4);
+
+ i += tab->run;
+ if (i < 64)
+ goto normal_code;
+
+ /* escape code */
+
+ i += UBITS (bit_buf << 6, 6) - 64;
+ if (i >= 64)
+ break; /* illegal, check needed to avoid buffer overflow */
+
+ j = scan[i];
+
+ DUMPBITS (bit_buf, bits, 12);
+ NEEDBITS (bit_buf, bits, bit_ptr);
+ val = 2 * (SBITS (bit_buf, 12) + SBITS (bit_buf, 1)) + 1;
+ val = (val * quantizer_scale * quant_matrix[j]) / 32;
+
+ SATURATE (val);
+ dest[j] = val;
+ mismatch ^= val;
+
+ DUMPBITS (bit_buf, bits, 12);
+ NEEDBITS (bit_buf, bits, bit_ptr);
+
+ continue;
+
+ } else if (bit_buf >= 0x02000000) {
+ tab = DCT_B14_10 + (UBITS (bit_buf, 10) - 8);
+ i += tab->run;
+ if (i < 64)
+ goto normal_code;
+ } else if (bit_buf >= 0x00800000) {
+ tab = DCT_13 + (UBITS (bit_buf, 13) - 16);
+ i += tab->run;
+ if (i < 64)
+ goto normal_code;
+ } else if (bit_buf >= 0x00200000) {
+ tab = DCT_15 + (UBITS (bit_buf, 15) - 16);
+ i += tab->run;
+ if (i < 64)
+ goto normal_code;
+ } else {
+ tab = DCT_16 + UBITS (bit_buf, 16);
+ bit_buf <<= 16;
+ GETWORD (bit_buf, bits + 16, bit_ptr);
+ i += tab->run;
+ if (i < 64)
+ goto normal_code;
+ }
+ break; /* illegal, check needed to avoid buffer overflow */
+ }
+ dest[63] ^= mismatch & 1;
+ DUMPBITS (bit_buf, bits, 2); /* dump end of block code */
+ picture->bitstream_buf = bit_buf;
+ picture->bitstream_bits = bits;
+ picture->bitstream_ptr = bit_ptr;
+}
+
+static void get_mpeg1_intra_block (picture_t * picture)
+{
+ int i;
+ int j;
+ int val;
+ uint8_t * scan = picture->scan;
+ uint8_t * quant_matrix = picture->intra_quantizer_matrix;
+ int quantizer_scale = picture->quantizer_scale;
+ const DCTtab * tab;
+ uint32_t bit_buf;
+ int bits;
+ uint8_t * bit_ptr;
+ int16_t * dest;
+
+ i = 0;
+ dest = picture->DCTblock;
+
+ bit_buf = picture->bitstream_buf;
+ bits = picture->bitstream_bits;
+ bit_ptr = picture->bitstream_ptr;
+
+ NEEDBITS (bit_buf, bits, bit_ptr);
+
+ while (1) {
+ if (bit_buf >= 0x28000000) {
+
+ tab = DCT_B14AC_5 + (UBITS (bit_buf, 5) - 5);
+
+ i += tab->run;
+ if (i >= 64)
+ break; /* end of block */
+
+ normal_code:
+ j = scan[i];
+ bit_buf <<= tab->len;
+ bits += tab->len + 1;
+ val = (tab->level * quantizer_scale * quant_matrix[j]) >> 4;
+
+ /* oddification */
+ val = (val - 1) | 1;
+
+ /* if (bitstream_get (1)) val = -val; */
+ val = (val ^ SBITS (bit_buf, 1)) - SBITS (bit_buf, 1);
+
+ SATURATE (val);
+ dest[j] = val;
+
+ bit_buf <<= 1;
+ NEEDBITS (bit_buf, bits, bit_ptr);
+
+ continue;
+
+ } else if (bit_buf >= 0x04000000) {
+
+ tab = DCT_B14_8 + (UBITS (bit_buf, 8) - 4);
+
+ i += tab->run;
+ if (i < 64)
+ goto normal_code;
+
+ /* escape code */
+
+ i += UBITS (bit_buf << 6, 6) - 64;
+ if (i >= 64)
+ break; /* illegal, check needed to avoid buffer overflow */
+
+ j = scan[i];
+
+ DUMPBITS (bit_buf, bits, 12);
+ NEEDBITS (bit_buf, bits, bit_ptr);
+ val = SBITS (bit_buf, 8);
+ if (! (val & 0x7f)) {
+ DUMPBITS (bit_buf, bits, 8);
+ val = UBITS (bit_buf, 8) + 2 * val;
+ }
+ val = (val * quantizer_scale * quant_matrix[j]) / 16;
+
+ /* oddification */
+ val = (val + ~SBITS (val, 1)) | 1;
+
+ SATURATE (val);
+ dest[j] = val;
+
+ DUMPBITS (bit_buf, bits, 8);
+ NEEDBITS (bit_buf, bits, bit_ptr);
+
+ continue;
+
+ } else if (bit_buf >= 0x02000000) {
+ tab = DCT_B14_10 + (UBITS (bit_buf, 10) - 8);
+ i += tab->run;
+ if (i < 64)
+ goto normal_code;
+ } else if (bit_buf >= 0x00800000) {
+ tab = DCT_13 + (UBITS (bit_buf, 13) - 16);
+ i += tab->run;
+ if (i < 64)
+ goto normal_code;
+ } else if (bit_buf >= 0x00200000) {
+ tab = DCT_15 + (UBITS (bit_buf, 15) - 16);
+ i += tab->run;
+ if (i < 64)
+ goto normal_code;
+ } else {
+ tab = DCT_16 + UBITS (bit_buf, 16);
+ bit_buf <<= 16;
+ GETWORD (bit_buf, bits + 16, bit_ptr);
+ i += tab->run;
+ if (i < 64)
+ goto normal_code;
+ }
+ break; /* illegal, check needed to avoid buffer overflow */
+ }
+ DUMPBITS (bit_buf, bits, 2); /* dump end of block code */
+ picture->bitstream_buf = bit_buf;
+ picture->bitstream_bits = bits;
+ picture->bitstream_ptr = bit_ptr;
+}
+
+static void get_mpeg1_non_intra_block (picture_t * picture)
+{
+ int i;
+ int j;
+ int val;
+ uint8_t * scan = picture->scan;
+ uint8_t * quant_matrix = picture->non_intra_quantizer_matrix;
+ int quantizer_scale = picture->quantizer_scale;
+ const DCTtab * tab;
+ uint32_t bit_buf;
+ int bits;
+ uint8_t * bit_ptr;
+ int16_t * dest;
+
+ i = -1;
+ dest = picture->DCTblock;
+
+ bit_buf = picture->bitstream_buf;
+ bits = picture->bitstream_bits;
+ bit_ptr = picture->bitstream_ptr;
+
+ NEEDBITS (bit_buf, bits, bit_ptr);
+ if (bit_buf >= 0x28000000) {
+ tab = DCT_B14DC_5 + (UBITS (bit_buf, 5) - 5);
+ goto entry_1;
+ } else
+ goto entry_2;
+
+ while (1) {
+ if (bit_buf >= 0x28000000) {
+
+ tab = DCT_B14AC_5 + (UBITS (bit_buf, 5) - 5);
+
+ entry_1:
+ i += tab->run;
+ if (i >= 64)
+ break; /* end of block */
+
+ normal_code:
+ j = scan[i];
+ bit_buf <<= tab->len;
+ bits += tab->len + 1;
+ val = ((2*tab->level+1) * quantizer_scale * quant_matrix[j]) >> 5;
+
+ /* oddification */
+ val = (val - 1) | 1;
+
+ /* if (bitstream_get (1)) val = -val; */
+ val = (val ^ SBITS (bit_buf, 1)) - SBITS (bit_buf, 1);
+
+ SATURATE (val);
+ dest[j] = val;
+
+ bit_buf <<= 1;
+ NEEDBITS (bit_buf, bits, bit_ptr);
+
+ continue;
+
+ }
+
+ entry_2:
+ if (bit_buf >= 0x04000000) {
+
+ tab = DCT_B14_8 + (UBITS (bit_buf, 8) - 4);
+
+ i += tab->run;
+ if (i < 64)
+ goto normal_code;
+
+ /* escape code */
+
+ i += UBITS (bit_buf << 6, 6) - 64;
+ if (i >= 64)
+ break; /* illegal, check needed to avoid buffer overflow */
+
+ j = scan[i];
+
+ DUMPBITS (bit_buf, bits, 12);
+ NEEDBITS (bit_buf, bits, bit_ptr);
+ val = SBITS (bit_buf, 8);
+ if (! (val & 0x7f)) {
+ DUMPBITS (bit_buf, bits, 8);
+ val = UBITS (bit_buf, 8) + 2 * val;
+ }
+ val = 2 * (val + SBITS (val, 1)) + 1;
+ val = (val * quantizer_scale * quant_matrix[j]) / 32;
+
+ /* oddification */
+ val = (val + ~SBITS (val, 1)) | 1;
+
+ SATURATE (val);
+ dest[j] = val;
+
+ DUMPBITS (bit_buf, bits, 8);
+ NEEDBITS (bit_buf, bits, bit_ptr);
+
+ continue;
+
+ } else if (bit_buf >= 0x02000000) {
+ tab = DCT_B14_10 + (UBITS (bit_buf, 10) - 8);
+ i += tab->run;
+ if (i < 64)
+ goto normal_code;
+ } else if (bit_buf >= 0x00800000) {
+ tab = DCT_13 + (UBITS (bit_buf, 13) - 16);
+ i += tab->run;
+ if (i < 64)
+ goto normal_code;
+ } else if (bit_buf >= 0x00200000) {
+ tab = DCT_15 + (UBITS (bit_buf, 15) - 16);
+ i += tab->run;
+ if (i < 64)
+ goto normal_code;
+ } else {
+ tab = DCT_16 + UBITS (bit_buf, 16);
+ bit_buf <<= 16;
+ GETWORD (bit_buf, bits + 16, bit_ptr);
+ i += tab->run;
+ if (i < 64)
+ goto normal_code;
+ }
+ break; /* illegal, check needed to avoid buffer overflow */
+ }
+ DUMPBITS (bit_buf, bits, 2); /* dump end of block code */
+ picture->bitstream_buf = bit_buf;
+ picture->bitstream_bits = bits;
+ picture->bitstream_ptr = bit_ptr;
+}
+
+static inline void slice_intra_DCT (picture_t * picture, int cc,
+ uint8_t * dest, int stride)
+{
+#define bit_buf (picture->bitstream_buf)
+#define bits (picture->bitstream_bits)
+#define bit_ptr (picture->bitstream_ptr)
+ NEEDBITS (bit_buf, bits, bit_ptr);
+ /* Get the intra DC coefficient and inverse quantize it */
+ if (cc == 0)
+ picture->dc_dct_pred[0] += get_luma_dc_dct_diff (picture);
+ else
+ picture->dc_dct_pred[cc] += get_chroma_dc_dct_diff (picture);
+ picture->DCTblock[0] =
+ picture->dc_dct_pred[cc] << (3 - picture->intra_dc_precision);
+
+ if (picture->mpeg1) {
+ if (picture->picture_coding_type != D_TYPE)
+ get_mpeg1_intra_block (picture);
+ } else if (picture->intra_vlc_format)
+ get_intra_block_B15 (picture);
+ else
+ get_intra_block_B14 (picture);
+ mpeg2_idct_copy (picture->DCTblock, dest, stride);
+#undef bit_buf
+#undef bits
+#undef bit_ptr
+}
+
+static inline void slice_non_intra_DCT (picture_t * picture, uint8_t * dest,
+ int stride)
+{
+ if (picture->mpeg1)
+ get_mpeg1_non_intra_block (picture);
+ else
+ get_non_intra_block (picture);
+ mpeg2_idct_add (picture->DCTblock, dest, stride);
+}
+
+#define MOTION(table,ref,motion_x,motion_y,size,y) \
+ pos_x = 2 * picture->offset + motion_x; \
+ pos_y = 2 * picture->v_offset + motion_y + 2 * y; \
+ if (pos_x > picture->limit_x) { \
+ pos_x = ((int)pos_x < 0) ? 0 : picture->limit_x; \
+ motion_x = pos_x - 2 * picture->offset; \
+ } \
+ if (pos_y > picture->limit_y_ ## size){ \
+ pos_y = ((int)pos_y < 0) ? 0 : picture->limit_y_ ## size; \
+ motion_y = pos_y - 2 * picture->v_offset - 2 * y; \
+ } \
+ xy_half = ((pos_y & 1) << 1) | (pos_x & 1); \
+ table[xy_half] (picture->dest[0] + y * picture->pitches[0] + \
+ picture->offset, ref[0] + (pos_x >> 1) + \
+ (pos_y >> 1) * picture->pitches[0], picture->pitches[0], \
+ size); \
+ motion_x /= 2; motion_y /= 2; \
+ xy_half = ((motion_y & 1) << 1) | (motion_x & 1); \
+ table[4+xy_half] (picture->dest[1] + y/2 * picture->pitches[1] + \
+ (picture->offset >> 1), ref[1] + \
+ (((picture->offset + motion_x) >> 1) + \
+ ((((picture->v_offset + motion_y) >> 1) + y/2) * \
+ picture->pitches[1])), picture->pitches[1], size/2); \
+ table[4+xy_half] (picture->dest[2] + y/2 * picture->pitches[2] + \
+ (picture->offset >> 1), ref[2] + \
+ (((picture->offset + motion_x) >> 1) + \
+ ((((picture->v_offset + motion_y) >> 1) + y/2) * \
+ picture->pitches[2])), picture->pitches[2], size/2) \
+
+#define MOTION_FIELD(table,ref,motion_x,motion_y,dest_field,op,src_field) \
+ pos_x = 2 * picture->offset + motion_x; \
+ pos_y = picture->v_offset + motion_y; \
+ if (pos_x > picture->limit_x) { \
+ pos_x = ((int)pos_x < 0) ? 0 : picture->limit_x; \
+ motion_x = pos_x - 2 * picture->offset; \
+ } \
+ if (pos_y > picture->limit_y){ \
+ pos_y = ((int)pos_y < 0) ? 0 : picture->limit_y; \
+ motion_y = pos_y - picture->v_offset; \
+ } \
+ xy_half = ((pos_y & 1) << 1) | (pos_x & 1); \
+ table[xy_half] (picture->dest[0] + dest_field * picture->pitches[0] + \
+ picture->offset, \
+ (ref[0] + (pos_x >> 1) + \
+ ((pos_y op) + src_field) * picture->pitches[0]), \
+ 2 * picture->pitches[0], 8); \
+ motion_x /= 2; motion_y /= 2; \
+ xy_half = ((motion_y & 1) << 1) | (motion_x & 1); \
+ table[4+xy_half] (picture->dest[1] + dest_field * picture->pitches[1] + \
+ (picture->offset >> 1), ref[1] + \
+ (((picture->offset + motion_x) >> 1) + \
+ (((picture->v_offset >> 1) + \
+ (motion_y op) + src_field) * picture->pitches[1])), \
+ 2 * picture->pitches[1], 4); \
+ table[4+xy_half] (picture->dest[2] + dest_field * picture->pitches[2] + \
+ (picture->offset >> 1), ref[2] + \
+ (((picture->offset + motion_x) >> 1) + \
+ (((picture->v_offset >> 1) + \
+ (motion_y op) + src_field) * picture->pitches[2])), \
+ 2 * picture->pitches[2], 4)
+
+static void motion_mp1 (picture_t * picture, motion_t * motion,
+ void (** table) (uint8_t *, uint8_t *, int, int))
+{
+#define bit_buf (picture->bitstream_buf)
+#define bits (picture->bitstream_bits)
+#define bit_ptr (picture->bitstream_ptr)
+ int motion_x, motion_y;
+ unsigned int pos_x, pos_y, xy_half;
+
+ NEEDBITS (bit_buf, bits, bit_ptr);
+ motion_x = (motion->pmv[0][0] +
+ (get_motion_delta (picture,
+ motion->f_code[0]) << motion->f_code[1]));
+ motion_x = bound_motion_vector (motion_x,
+ motion->f_code[0] + motion->f_code[1]);
+ motion->pmv[0][0] = motion_x;
+
+ NEEDBITS (bit_buf, bits, bit_ptr);
+ motion_y = (motion->pmv[0][1] +
+ (get_motion_delta (picture,
+ motion->f_code[0]) << motion->f_code[1]));
+ motion_y = bound_motion_vector (motion_y,
+ motion->f_code[0] + motion->f_code[1]);
+ motion->pmv[0][1] = motion_y;
+
+ MOTION (table, motion->ref[0], motion_x, motion_y, 16, 0);
+#undef bit_buf
+#undef bits
+#undef bit_ptr
+}
+
+static void motion_fr_frame (picture_t * picture, motion_t * motion,
+ void (** table) (uint8_t *, uint8_t *, int, int))
+{
+#define bit_buf (picture->bitstream_buf)
+#define bits (picture->bitstream_bits)
+#define bit_ptr (picture->bitstream_ptr)
+ int motion_x, motion_y;
+ unsigned int pos_x, pos_y, xy_half;
+
+ NEEDBITS (bit_buf, bits, bit_ptr);
+ motion_x = motion->pmv[0][0] + get_motion_delta (picture,
+ 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);
+ motion_y = motion->pmv[0][1] + get_motion_delta (picture,
+ 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, motion->ref[0], motion_x, motion_y, 16, 0);
+#undef bit_buf
+#undef bits
+#undef bit_ptr
+}
+
+static void motion_fr_field (picture_t * picture, motion_t * motion,
+ void (** table) (uint8_t *, uint8_t *, int, int))
+{
+#define bit_buf (picture->bitstream_buf)
+#define bits (picture->bitstream_bits)
+#define bit_ptr (picture->bitstream_ptr)
+ int motion_x, motion_y, field;
+ unsigned int pos_x, pos_y, xy_half;
+
+ NEEDBITS (bit_buf, bits, bit_ptr);
+ field = UBITS (bit_buf, 1);
+ DUMPBITS (bit_buf, bits, 1);
+
+ motion_x = motion->pmv[0][0] + get_motion_delta (picture,
+ 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] >> 1) + get_motion_delta (picture,
+ motion->f_code[1]);
+ /* motion_y = bound_motion_vector (motion_y, motion->f_code[1]); */
+ motion->pmv[0][1] = motion_y << 1;
+
+ MOTION_FIELD (table, motion->ref[0], motion_x, motion_y, 0, & ~1, field);
+
+ NEEDBITS (bit_buf, bits, bit_ptr);
+ field = UBITS (bit_buf, 1);
+ DUMPBITS (bit_buf, bits, 1);
+
+ motion_x = motion->pmv[1][0] + get_motion_delta (picture,
+ 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] >> 1) + get_motion_delta (picture,
+ motion->f_code[1]);
+ /* motion_y = bound_motion_vector (motion_y, motion->f_code[1]); */
+ motion->pmv[1][1] = motion_y << 1;
+
+ MOTION_FIELD (table, motion->ref[0], motion_x, motion_y, 1, & ~1, field);
+#undef bit_buf
+#undef bits
+#undef bit_ptr
+}
+
+static void motion_fr_dmv (picture_t * picture, motion_t * motion,
+ void (** table) (uint8_t *, uint8_t *, int, int))
+{
+#define bit_buf (picture->bitstream_buf)
+#define bits (picture->bitstream_bits)
+#define bit_ptr (picture->bitstream_ptr)
+ int motion_x, motion_y, dmv_x, dmv_y, m, 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 (picture,
+ 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);
+ dmv_x = get_dmv (picture);
+
+ motion_y = (motion->pmv[0][1] >> 1) + get_motion_delta (picture,
+ 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 << 1;
+ dmv_y = get_dmv (picture);
+
+ m = picture->top_field_first ? 1 : 3;
+ other_x = ((motion_x * m + (motion_x > 0)) >> 1) + dmv_x;
+ other_y = ((motion_y * m + (motion_y > 0)) >> 1) + dmv_y - 1;
+ MOTION_FIELD (mpeg2_mc.put, motion->ref[0], other_x, other_y, 0, | 1, 0);
+
+ m = picture->top_field_first ? 3 : 1;
+ other_x = ((motion_x * m + (motion_x > 0)) >> 1) + dmv_x;
+ other_y = ((motion_y * m + (motion_y > 0)) >> 1) + dmv_y + 1;
+ MOTION_FIELD (mpeg2_mc.put, motion->ref[0], other_x, other_y, 1, & ~1, 0);
+
+ pos_x = 2 * picture->offset + motion_x;
+ pos_y = picture->v_offset + motion_y;
+ if(pos_x > picture->limit_x){
+ pos_x = ((int)pos_x < 0) ? 0 : picture->limit_x;
+ motion_x = pos_x - 2 * picture->offset;
+ }
+ if(pos_y > picture->limit_y){
+ pos_y = ((int)pos_y < 0) ? 0 : picture->limit_y;
+ motion_y = pos_y - picture->v_offset;
+ }
+ xy_half = ((pos_y & 1) << 1) | (pos_x & 1);
+ offset = (pos_x >> 1) + (pos_y & ~1) * picture->pitches[0];
+ mpeg2_mc.avg[xy_half]
+ (picture->dest[0] + picture->offset,
+ motion->ref[0][0] + offset, 2 * picture->pitches[0], 8);
+ mpeg2_mc.avg[xy_half]
+ (picture->dest[0] + picture->pitches[0] + picture->offset,
+ motion->ref[0][0] + picture->pitches[0] + offset,
+ 2 * picture->pitches[0], 8);
+ motion_x /= 2; motion_y /= 2;
+ xy_half = ((motion_y & 1) << 1) | (motion_x & 1);
+ offset = (((picture->offset + motion_x) >> 1) +
+ (((picture->v_offset >> 1) + (motion_y & ~1)) *
+ picture->pitches[1]));
+ mpeg2_mc.avg[4+xy_half]
+ (picture->dest[1] + (picture->offset >> 1),
+ motion->ref[0][1] + offset, 2 * picture->pitches[1], 4);
+ mpeg2_mc.avg[4+xy_half]
+ (picture->dest[1] + picture->pitches[1] + (picture->offset >> 1),
+ motion->ref[0][1] + picture->pitches[1] + offset,
+ 2 * picture->pitches[1], 4);
+ offset = (((picture->offset + motion_x) >> 1) +
+ (((picture->v_offset >> 1) + (motion_y & ~1)) *
+ picture->pitches[2]));
+ mpeg2_mc.avg[4+xy_half]
+ (picture->dest[2] + (picture->offset >> 1),
+ motion->ref[0][2] + offset, 2 * picture->pitches[2], 4);
+ mpeg2_mc.avg[4+xy_half]
+ (picture->dest[2] + picture->pitches[2] + (picture->offset >> 1),
+ motion->ref[0][2] + picture->pitches[2] + offset,
+ 2 * picture->pitches[2], 4);
+#undef bit_buf
+#undef bits
+#undef bit_ptr
+}
+
+static void motion_reuse (picture_t * picture, motion_t * motion,
+ void (** table) (uint8_t *, uint8_t *, int, int))
+{
+ int motion_x, motion_y;
+ unsigned int pos_x, pos_y, xy_half;
+
+ motion_x = motion->pmv[0][0];
+ motion_y = motion->pmv[0][1];
+
+ MOTION (table, motion->ref[0], motion_x, motion_y, 16, 0);
+}
+
+static void motion_zero (picture_t * picture, motion_t * motion,
+ void (** table) (uint8_t *, uint8_t *, int, int))
+{
+ table[0] (picture->dest[0] + picture->offset,
+ (motion->ref[0][0] + picture->offset +
+ picture->v_offset * picture->pitches[0]),
+ picture->pitches[0], 16);
+
+ table[4] (picture->dest[1] + (picture->offset >> 1),
+ motion->ref[0][1] + (picture->offset >> 1) +
+ (picture->v_offset >> 1) * picture->pitches[1],
+ picture->pitches[1], 8);
+ table[4] (picture->dest[2] + (picture->offset >> 1),
+ motion->ref[0][2] + (picture->offset >> 1) +
+ (picture->v_offset >> 1) * picture->pitches[2],
+ picture->pitches[2], 8);
+}
+
+/* like motion_frame, but parsing without actual motion compensation */
+static void motion_fr_conceal (picture_t * picture)
+{
+#define bit_buf (picture->bitstream_buf)
+#define bits (picture->bitstream_bits)
+#define bit_ptr (picture->bitstream_ptr)
+ int tmp;
+
+ NEEDBITS (bit_buf, bits, bit_ptr);
+ tmp = (picture->f_motion.pmv[0][0] +
+ get_motion_delta (picture, picture->f_motion.f_code[0]));
+ tmp = bound_motion_vector (tmp, picture->f_motion.f_code[0]);
+ picture->f_motion.pmv[1][0] = picture->f_motion.pmv[0][0] = tmp;
+
+ NEEDBITS (bit_buf, bits, bit_ptr);
+ tmp = (picture->f_motion.pmv[0][1] +
+ get_motion_delta (picture, picture->f_motion.f_code[1]));
+ tmp = bound_motion_vector (tmp, picture->f_motion.f_code[1]);
+ picture->f_motion.pmv[1][1] = picture->f_motion.pmv[0][1] = tmp;
+
+ DUMPBITS (bit_buf, bits, 1); /* remove marker_bit */
+#undef bit_buf
+#undef bits
+#undef bit_ptr
+}
+
+static void motion_fi_field (picture_t * picture, motion_t * motion,
+ void (** table) (uint8_t *, uint8_t *, int, int))
+{
+#define bit_buf (picture->bitstream_buf)
+#define bits (picture->bitstream_bits)
+#define bit_ptr (picture->bitstream_ptr)
+ int motion_x, motion_y;
+ uint8_t ** ref_field;
+ unsigned int pos_x, pos_y, xy_half;
+
+ 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 (picture,
+ 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);
+ motion_y = motion->pmv[0][1] + get_motion_delta (picture,
+ 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);
+#undef bit_buf
+#undef bits
+#undef bit_ptr
+}
+
+static void motion_fi_16x8 (picture_t * picture, motion_t * motion,
+ void (** table) (uint8_t *, uint8_t *, int, int))
+{
+#define bit_buf (picture->bitstream_buf)
+#define bits (picture->bitstream_bits)
+#define bit_ptr (picture->bitstream_ptr)
+ int motion_x, motion_y;
+ uint8_t ** ref_field;
+ unsigned int pos_x, pos_y, xy_half;
+
+ 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 (picture,
+ 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 (picture,
+ 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 (picture,
+ 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 (picture,
+ 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);
+#undef bit_buf
+#undef bits
+#undef bit_ptr
+}
+
+static void motion_fi_dmv (picture_t * picture, motion_t * motion,
+ void (** table) (uint8_t *, uint8_t *, int, int))
+{
+#define bit_buf (picture->bitstream_buf)
+#define bits (picture->bitstream_bits)
+#define bit_ptr (picture->bitstream_ptr)
+ int motion_x, motion_y, other_x, other_y;
+ unsigned int pos_x, pos_y, xy_half;
+
+ NEEDBITS (bit_buf, bits, bit_ptr);
+ motion_x = motion->pmv[0][0] + get_motion_delta (picture,
+ 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 (picture);
+
+ motion_y = motion->pmv[0][1] + get_motion_delta (picture,
+ 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 (picture) +
+ picture->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);
+#undef bit_buf
+#undef bits
+#undef bit_ptr
+}
+
+static void motion_fi_conceal (picture_t * picture)
+{
+#define bit_buf (picture->bitstream_buf)
+#define bits (picture->bitstream_bits)
+#define bit_ptr (picture->bitstream_ptr)
+ int tmp;
+
+ NEEDBITS (bit_buf, bits, bit_ptr);
+ DUMPBITS (bit_buf, bits, 1); /* remove field_select */
+
+ tmp = (picture->f_motion.pmv[0][0] +
+ get_motion_delta (picture, picture->f_motion.f_code[0]));
+ tmp = bound_motion_vector (tmp, picture->f_motion.f_code[0]);
+ picture->f_motion.pmv[1][0] = picture->f_motion.pmv[0][0] = tmp;
+
+ NEEDBITS (bit_buf, bits, bit_ptr);
+ tmp = (picture->f_motion.pmv[0][1] +
+ get_motion_delta (picture, picture->f_motion.f_code[1]));
+ tmp = bound_motion_vector (tmp, picture->f_motion.f_code[1]);
+ picture->f_motion.pmv[1][1] = picture->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 (picture, &(picture->f_motion), mpeg2_mc.put); \
+ if ((direction) & MACROBLOCK_MOTION_BACKWARD) \
+ routine (picture, &(picture->b_motion), \
+ ((direction) & MACROBLOCK_MOTION_FORWARD ? \
+ mpeg2_mc.avg : mpeg2_mc.put)); \
+} while (0)
+
+#define NEXT_MACROBLOCK \
+do { \
+ picture->offset += 16; \
+ if (picture->offset == picture->coded_picture_width) { \
+ do { /* just so we can use the break statement */ \
+ if (picture->current_frame->proc_slice) { \
+ picture->current_frame->proc_slice (picture->current_frame, \
+ picture->dest); \
+ } \
+ picture->dest[0] += 16 * picture->pitches[0]; \
+ picture->dest[1] += 8 * picture->pitches[1]; \
+ picture->dest[2] += 8 * picture->pitches[2]; \
+ } while (0); \
+ picture->v_offset += 16; \
+ if (picture->v_offset > picture->limit_y) { \
+ if (mpeg2_cpu_state_restore) \
+ mpeg2_cpu_state_restore (&cpu_state); \
+ return; \
+ } \
+ picture->offset = 0; \
+ } \
+} while (0)
+
+static inline int slice_init (picture_t * picture, int code)
+{
+#define bit_buf (picture->bitstream_buf)
+#define bits (picture->bitstream_bits)
+#define bit_ptr (picture->bitstream_ptr)
+ int offset, height;
+ struct vo_frame_s * forward_reference_frame;
+ struct vo_frame_s * backward_reference_frame;
+ const MBAtab * mba;
+
+ offset = picture->picture_structure == BOTTOM_FIELD;
+ picture->pitches[0] = picture->current_frame->pitches[0];
+ picture->pitches[1] = picture->current_frame->pitches[1];
+ picture->pitches[2] = picture->current_frame->pitches[2];
+
+ if( picture->forward_reference_frame ) {
+ forward_reference_frame = picture->forward_reference_frame;
+ }
+ else {
+ /* return 1; */
+ forward_reference_frame = picture->current_frame;
+ }
+
+ if( picture->backward_reference_frame ) {
+ backward_reference_frame = picture->backward_reference_frame;
+ }
+ else {
+ /* return 1; */
+ backward_reference_frame = picture->current_frame;
+ }
+
+ picture->f_motion.ref[0][0] =
+ forward_reference_frame->base[0] + (offset ? picture->pitches[0] : 0);
+ picture->f_motion.ref[0][1] =
+ forward_reference_frame->base[1] + (offset ? picture->pitches[1] : 0);
+ picture->f_motion.ref[0][2] =
+ forward_reference_frame->base[2] + (offset ? picture->pitches[2] : 0);
+
+ picture->b_motion.ref[0][0] =
+ backward_reference_frame->base[0] + (offset ? picture->pitches[0] : 0);
+ picture->b_motion.ref[0][1] =
+ backward_reference_frame->base[1] + (offset ? picture->pitches[1] : 0);
+ picture->b_motion.ref[0][2] =
+ backward_reference_frame->base[2] + (offset ? picture->pitches[2] : 0);
+
+ if (picture->picture_structure != FRAME_PICTURE) {
+ uint8_t ** forward_ref;
+ int bottom_field;
+
+ bottom_field = (picture->picture_structure == BOTTOM_FIELD);
+ picture->dmv_offset = bottom_field ? 1 : -1;
+ picture->f_motion.ref2[0] = picture->f_motion.ref[bottom_field];
+ picture->f_motion.ref2[1] = picture->f_motion.ref[!bottom_field];
+ picture->b_motion.ref2[0] = picture->b_motion.ref[bottom_field];
+ picture->b_motion.ref2[1] = picture->b_motion.ref[!bottom_field];
+
+ forward_ref = forward_reference_frame->base;
+ if (picture->second_field && (picture->picture_coding_type != B_TYPE))
+ forward_ref = picture->current_frame->base;
+
+ picture->f_motion.ref[1][0] = forward_ref[0] + (bottom_field ? 0 : picture->pitches[0]);
+ picture->f_motion.ref[1][1] = forward_ref[1] + (bottom_field ? 0 : picture->pitches[1]);
+ picture->f_motion.ref[1][2] = forward_ref[2] + (bottom_field ? 0 : picture->pitches[2]);
+
+ picture->b_motion.ref[1][0] =
+ backward_reference_frame->base[0] + (bottom_field ? 0 : picture->pitches[0]);
+ picture->b_motion.ref[1][1] =
+ backward_reference_frame->base[1] + (bottom_field ? 0 : picture->pitches[1]);
+ picture->b_motion.ref[1][2] =
+ backward_reference_frame->base[2] + (bottom_field ? 0 : picture->pitches[2]);
+ }
+
+ picture->f_motion.pmv[0][0] = picture->f_motion.pmv[0][1] = 0;
+ picture->f_motion.pmv[1][0] = picture->f_motion.pmv[1][1] = 0;
+ picture->b_motion.pmv[0][0] = picture->b_motion.pmv[0][1] = 0;
+ picture->b_motion.pmv[1][0] = picture->b_motion.pmv[1][1] = 0;
+
+ picture->v_offset = (code - 1) * 16;
+ offset = (code - 1);
+ if (picture->picture_structure != FRAME_PICTURE)
+ offset = 2 * offset;
+
+ picture->dest[0] = picture->current_frame->base[0] + picture->pitches[0] * offset * 16;
+ picture->dest[1] = picture->current_frame->base[1] + picture->pitches[1] * offset * 8;
+ picture->dest[2] = picture->current_frame->base[2] + picture->pitches[2] * offset * 8;
+
+ height = picture->coded_picture_height;
+ switch (picture->picture_structure) {
+ case BOTTOM_FIELD:
+ picture->dest[0] += picture->pitches[0];
+ picture->dest[1] += picture->pitches[1];
+ picture->dest[2] += picture->pitches[2];
+ /* follow thru */
+ case TOP_FIELD:
+ picture->pitches[0] <<= 1;
+ picture->pitches[1] <<= 1;
+ picture->pitches[2] <<= 1;
+ height >>= 1;
+ }
+ picture->limit_x = 2 * picture->coded_picture_width - 32;
+ picture->limit_y_16 = 2 * height - 32;
+ picture->limit_y_8 = 2 * height - 16;
+ picture->limit_y = height - 16;
+
+ picture->dc_dct_pred[0] = picture->dc_dct_pred[1] =
+ picture->dc_dct_pred[2] = 1 << (picture->intra_dc_precision + 7);
+
+ picture->quantizer_scale = get_quantizer_scale (picture);
+
+ /* ignore intra_slice and all the extra data */
+ while (bit_buf & 0x80000000) {
+ DUMPBITS (bit_buf, bits, 9);
+ NEEDBITS (bit_buf, bits, bit_ptr);
+ }
+
+ /* decode initial macroblock address increment */
+ offset = 0;
+ while (1) {
+ if (bit_buf >= 0x08000000) {
+ mba = MBA_5 + (UBITS (bit_buf, 6) - 2);
+ break;
+ } else if (bit_buf >= 0x01800000) {
+ mba = MBA_11 + (UBITS (bit_buf, 12) - 24);
+ break;
+ } else switch (UBITS (bit_buf, 12)) {
+ case 8: /* macroblock_escape */
+ offset += 33;
+ DUMPBITS (bit_buf, bits, 11);
+ NEEDBITS (bit_buf, bits, bit_ptr);
+ continue;
+ case 15: /* macroblock_stuffing (MPEG1 only) */
+ bit_buf &= 0xfffff;
+ DUMPBITS (bit_buf, bits, 11);
+ NEEDBITS (bit_buf, bits, bit_ptr);
+ continue;
+ default: /* error */
+ return 1;
+ }
+ }
+ DUMPBITS (bit_buf, bits, mba->len + 1);
+ picture->offset = (offset + mba->mba) << 4;
+
+ while (picture->offset - picture->coded_picture_width >= 0) {
+ picture->offset -= picture->coded_picture_width;
+ if ((picture->current_frame->proc_slice == NULL) ||
+ (picture->picture_coding_type != B_TYPE)) {
+ picture->dest[0] += 16 * picture->pitches[0];
+ picture->dest[1] += 8 * picture->pitches[1];
+ picture->dest[2] += 8 * picture->pitches[2];
+ }
+ picture->v_offset += 16;
+ }
+ if (picture->v_offset > picture->limit_y)
+ return 1;
+
+ return 0;
+#undef bit_buf
+#undef bits
+#undef bit_ptr
+}
+
+void mpeg2_slice (picture_t * picture, int code, uint8_t * buffer)
+{
+#define bit_buf (picture->bitstream_buf)
+#define bits (picture->bitstream_bits)
+#define bit_ptr (picture->bitstream_ptr)
+ cpu_state_t cpu_state;
+
+ bitstream_init (picture, buffer);
+
+ if (slice_init (picture, code))
+ return;
+
+ if (mpeg2_cpu_state_save)
+ mpeg2_cpu_state_save (&cpu_state);
+
+ while (1) {
+ int macroblock_modes;
+ int mba_inc;
+ const MBAtab * mba;
+
+ NEEDBITS (bit_buf, bits, bit_ptr);
+
+ macroblock_modes = get_macroblock_modes (picture);
+
+ /* maybe integrate MACROBLOCK_QUANT test into get_macroblock_modes ? */
+ if (macroblock_modes & MACROBLOCK_QUANT)
+ picture->quantizer_scale = get_quantizer_scale (picture);
+
+ if (macroblock_modes & MACROBLOCK_INTRA) {
+
+ int DCT_offset, DCT_stride;
+ int offset;
+ uint8_t * dest_y;
+
+ if (picture->concealment_motion_vectors) {
+ if (picture->picture_structure == FRAME_PICTURE)
+ motion_fr_conceal (picture);
+ else
+ motion_fi_conceal (picture);
+ } else {
+ picture->f_motion.pmv[0][0] = picture->f_motion.pmv[0][1] = 0;
+ picture->f_motion.pmv[1][0] = picture->f_motion.pmv[1][1] = 0;
+ picture->b_motion.pmv[0][0] = picture->b_motion.pmv[0][1] = 0;
+ picture->b_motion.pmv[1][0] = picture->b_motion.pmv[1][1] = 0;
+ }
+
+ if (macroblock_modes & DCT_TYPE_INTERLACED) {
+ DCT_offset = picture->pitches[0];
+ DCT_stride = picture->pitches[0] * 2;
+ } else {
+ DCT_offset = picture->pitches[0] * 8;
+ DCT_stride = picture->pitches[0];
+ }
+
+ offset = picture->offset;
+ dest_y = picture->dest[0] + offset;
+ slice_intra_DCT (picture, 0, dest_y, DCT_stride);
+ slice_intra_DCT (picture, 0, dest_y + 8, DCT_stride);
+ slice_intra_DCT (picture, 0, dest_y + DCT_offset, DCT_stride);
+ slice_intra_DCT (picture, 0, dest_y + DCT_offset + 8, DCT_stride);
+ slice_intra_DCT (picture, 1, picture->dest[1] + (offset >> 1),
+ picture->pitches[1]);
+ slice_intra_DCT (picture, 2, picture->dest[2] + (offset >> 1),
+ picture->pitches[2]);
+
+ if (picture->picture_coding_type == D_TYPE) {
+ NEEDBITS (bit_buf, bits, bit_ptr);
+ DUMPBITS (bit_buf, bits, 1);
+ }
+ } else {
+
+ if (picture->picture_structure == FRAME_PICTURE)
+ switch (macroblock_modes & MOTION_TYPE_MASK) {
+ case MC_FRAME:
+ if (picture->mpeg1)
+ MOTION_CALL (motion_mp1, macroblock_modes);
+ else
+ MOTION_CALL (motion_fr_frame, macroblock_modes);
+ break;
+
+ case MC_FIELD:
+ MOTION_CALL (motion_fr_field, macroblock_modes);
+ break;
+
+ case MC_DMV:
+ MOTION_CALL (motion_fr_dmv, MACROBLOCK_MOTION_FORWARD);
+ break;
+
+ case 0:
+ /* non-intra mb without forward mv in a P picture */
+ picture->f_motion.pmv[0][0] = 0;
+ picture->f_motion.pmv[0][1] = 0;
+ picture->f_motion.pmv[1][0] = 0;
+ picture->f_motion.pmv[1][1] = 0;
+ MOTION_CALL (motion_zero, MACROBLOCK_MOTION_FORWARD);
+ break;
+ }
+ else
+ switch (macroblock_modes & MOTION_TYPE_MASK) {
+ case MC_FIELD:
+ MOTION_CALL (motion_fi_field, macroblock_modes);
+ break;
+
+ case MC_16X8:
+ MOTION_CALL (motion_fi_16x8, macroblock_modes);
+ break;
+
+ case MC_DMV:
+ MOTION_CALL (motion_fi_dmv, MACROBLOCK_MOTION_FORWARD);
+ break;
+
+ case 0:
+ /* non-intra mb without forward mv in a P picture */
+ picture->f_motion.pmv[0][0] = 0;
+ picture->f_motion.pmv[0][1] = 0;
+ picture->f_motion.pmv[1][0] = 0;
+ picture->f_motion.pmv[1][1] = 0;
+ MOTION_CALL (motion_zero, MACROBLOCK_MOTION_FORWARD);
+ break;
+ }
+
+ if (macroblock_modes & MACROBLOCK_PATTERN) {
+ int coded_block_pattern;
+ int DCT_offset, DCT_stride;
+ int offset;
+ uint8_t * dest_y;
+
+ if (macroblock_modes & DCT_TYPE_INTERLACED) {
+ DCT_offset = picture->pitches[0];
+ DCT_stride = picture->pitches[0] * 2;
+ } else {
+ DCT_offset = picture->pitches[0] * 8;
+ DCT_stride = picture->pitches[0];
+ }
+
+ coded_block_pattern = get_coded_block_pattern (picture);
+
+ offset = picture->offset;
+ dest_y = picture->dest[0] + offset;
+ if (coded_block_pattern & 0x20)
+ slice_non_intra_DCT (picture, dest_y, DCT_stride);
+ if (coded_block_pattern & 0x10)
+ slice_non_intra_DCT (picture, dest_y + 8, DCT_stride);
+ if (coded_block_pattern & 0x08)
+ slice_non_intra_DCT (picture, dest_y + DCT_offset,
+ DCT_stride);
+ if (coded_block_pattern & 0x04)
+ slice_non_intra_DCT (picture, dest_y + DCT_offset + 8,
+ DCT_stride);
+ if (coded_block_pattern & 0x2)
+ slice_non_intra_DCT (picture,
+ picture->dest[1] + (offset >> 1),
+ picture->pitches[1]);
+ if (coded_block_pattern & 0x1)
+ slice_non_intra_DCT (picture,
+ picture->dest[2] + (offset >> 1),
+ picture->pitches[2]);
+ }
+
+ picture->dc_dct_pred[0] = picture->dc_dct_pred[1] =
+ picture->dc_dct_pred[2] = 128 << picture->intra_dc_precision;
+ }
+
+ NEXT_MACROBLOCK;
+
+ NEEDBITS (bit_buf, bits, bit_ptr);
+ mba_inc = 0;
+ while (1) {
+ if (bit_buf >= 0x10000000) {
+ mba = MBA_5 + (UBITS (bit_buf, 5) - 2);
+ break;
+ } else if (bit_buf >= 0x03000000) {
+ mba = MBA_11 + (UBITS (bit_buf, 11) - 24);
+ break;
+ } else switch (UBITS (bit_buf, 11)) {
+ case 8: /* macroblock_escape */
+ mba_inc += 33;
+ /* pass through */
+ case 15: /* macroblock_stuffing (MPEG1 only) */
+ DUMPBITS (bit_buf, bits, 11);
+ NEEDBITS (bit_buf, bits, bit_ptr);
+ continue;
+ default: /* end of slice, or error */
+ if (mpeg2_cpu_state_restore)
+ mpeg2_cpu_state_restore (&cpu_state);
+ return;
+ }
+ }
+ DUMPBITS (bit_buf, bits, mba->len);
+ mba_inc += mba->mba;
+
+ if (mba_inc) {
+ picture->dc_dct_pred[0] = picture->dc_dct_pred[1] =
+ picture->dc_dct_pred[2] = 128 << picture->intra_dc_precision;
+
+ if (picture->picture_coding_type == P_TYPE) {
+ picture->f_motion.pmv[0][0] = picture->f_motion.pmv[0][1] = 0;
+ picture->f_motion.pmv[1][0] = picture->f_motion.pmv[1][1] = 0;
+
+ do {
+ MOTION_CALL (motion_zero, MACROBLOCK_MOTION_FORWARD);
+ NEXT_MACROBLOCK;
+ } while (--mba_inc);
+ } else {
+ do {
+ MOTION_CALL (motion_reuse, macroblock_modes);
+ NEXT_MACROBLOCK;
+ } while (--mba_inc);
+ }
+ }
+ }
+#undef bit_buf
+#undef bits
+#undef bit_ptr
+}
generated by cgit v1.2.3 (git 2.25.1) at 2025-04-25 16:07:06 +0000