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+/********************************************************************
+ * *
+ * THIS FILE IS PART OF THE OggTheora SOFTWARE CODEC SOURCE CODE. *
+ * USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS *
+ * GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE *
+ * IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING. *
+ * *
+ * THE Theora SOURCE CODE IS COPYRIGHT (C) 2002-2009 *
+ * by the Xiph.Org Foundation and contributors http://www.xiph.org/ *
+ * *
+ ********************************************************************
+
+ function:
+ last mod: $Id$
+
+ ********************************************************************/
+
+#include <limits.h>
+#if !defined(_decint_H)
+# define _decint_H (1)
+# include "theora/theoradec.h"
+# include "state.h"
+# include "bitpack.h"
+# include "huffdec.h"
+# include "dequant.h"
+
+typedef struct th_setup_info oc_setup_info;
+typedef struct oc_dec_opt_vtable oc_dec_opt_vtable;
+typedef struct oc_dec_pipeline_state oc_dec_pipeline_state;
+typedef struct th_dec_ctx oc_dec_ctx;
+
+
+
+/*Decoder-specific accelerated functions.*/
+# if defined(OC_C64X_ASM)
+# include "c64x/c64xdec.h"
+# endif
+
+# if !defined(oc_dec_accel_init)
+# define oc_dec_accel_init oc_dec_accel_init_c
+# endif
+# if defined(OC_DEC_USE_VTABLE)
+# if !defined(oc_dec_dc_unpredict_mcu_plane)
+# define oc_dec_dc_unpredict_mcu_plane(_dec,_pipe,_pli) \
+ ((*(_dec)->opt_vtable.dc_unpredict_mcu_plane)(_dec,_pipe,_pli))
+# endif
+# else
+# if !defined(oc_dec_dc_unpredict_mcu_plane)
+# define oc_dec_dc_unpredict_mcu_plane oc_dec_dc_unpredict_mcu_plane_c
+# endif
+# endif
+
+
+
+/*Constants for the packet-in state machine specific to the decoder.*/
+
+/*Next packet to read: Data packet.*/
+#define OC_PACKET_DATA (0)
+
+
+
+struct th_setup_info{
+ /*The Huffman codes.*/
+ ogg_int16_t *huff_tables[TH_NHUFFMAN_TABLES];
+ /*The quantization parameters.*/
+ th_quant_info qinfo;
+};
+
+
+
+/*Decoder specific functions with accelerated variants.*/
+struct oc_dec_opt_vtable{
+ void (*dc_unpredict_mcu_plane)(oc_dec_ctx *_dec,
+ oc_dec_pipeline_state *_pipe,int _pli);
+};
+
+
+
+struct oc_dec_pipeline_state{
+ /*Decoded DCT coefficients.
+ These are placed here instead of on the stack so that they can persist
+ between blocks, which makes clearing them back to zero much faster when
+ only a few non-zero coefficients were decoded.
+ It requires at least 65 elements because the zig-zag index array uses the
+ 65th element as a dumping ground for out-of-range indices to protect us
+ from buffer overflow.
+ We make it fully twice as large so that the second half can serve as the
+ reconstruction buffer, which saves passing another parameter to all the
+ acceleration functios.
+ It also solves problems with 16-byte alignment for NEON on ARM.
+ gcc (as of 4.2.1) only seems to be able to give stack variables 8-byte
+ alignment, and silently produces incorrect results if you ask for 16.
+ Finally, keeping it off the stack means there's less likely to be a data
+ hazard beween the NEON co-processor and the regular ARM core, which avoids
+ unnecessary stalls.*/
+ OC_ALIGN16(ogg_int16_t dct_coeffs[128]);
+ OC_ALIGN16(signed char bounding_values[256]);
+ ptrdiff_t ti[3][64];
+ ptrdiff_t ebi[3][64];
+ ptrdiff_t eob_runs[3][64];
+ const ptrdiff_t *coded_fragis[3];
+ const ptrdiff_t *uncoded_fragis[3];
+ ptrdiff_t ncoded_fragis[3];
+ ptrdiff_t nuncoded_fragis[3];
+ const ogg_uint16_t *dequant[3][3][2];
+ int fragy0[3];
+ int fragy_end[3];
+ int pred_last[3][4];
+ int mcu_nvfrags;
+ int loop_filter;
+ int pp_level;
+};
+
+
+struct th_dec_ctx{
+ /*Shared encoder/decoder state.*/
+ oc_theora_state state;
+ /*Whether or not packets are ready to be emitted.
+ This takes on negative values while there are remaining header packets to
+ be emitted, reaches 0 when the codec is ready for input, and goes to 1
+ when a frame has been processed and a data packet is ready.*/
+ int packet_state;
+ /*Buffer in which to assemble packets.*/
+ oc_pack_buf opb;
+ /*Huffman decode trees.*/
+ ogg_int16_t *huff_tables[TH_NHUFFMAN_TABLES];
+ /*The index of the first token in each plane for each coefficient.*/
+ ptrdiff_t ti0[3][64];
+ /*The number of outstanding EOB runs at the start of each coefficient in each
+ plane.*/
+ ptrdiff_t eob_runs[3][64];
+ /*The DCT token lists.*/
+ unsigned char *dct_tokens;
+ /*The extra bits associated with DCT tokens.*/
+ unsigned char *extra_bits;
+ /*The number of dct tokens unpacked so far.*/
+ int dct_tokens_count;
+ /*The out-of-loop post-processing level.*/
+ int pp_level;
+ /*The DC scale used for out-of-loop deblocking.*/
+ int pp_dc_scale[64];
+ /*The sharpen modifier used for out-of-loop deringing.*/
+ int pp_sharp_mod[64];
+ /*The DC quantization index of each block.*/
+ unsigned char *dc_qis;
+ /*The variance of each block.*/
+ int *variances;
+ /*The storage for the post-processed frame buffer.*/
+ unsigned char *pp_frame_data;
+ /*Whether or not the post-processsed frame buffer has space for chroma.*/
+ int pp_frame_state;
+ /*The buffer used for the post-processed frame.
+ Note that this is _not_ guaranteed to have the same strides and offsets as
+ the reference frame buffers.*/
+ th_ycbcr_buffer pp_frame_buf;
+ /*The striped decode callback function.*/
+ th_stripe_callback stripe_cb;
+ oc_dec_pipeline_state pipe;
+# if defined(OC_DEC_USE_VTABLE)
+ /*Table for decoder acceleration functions.*/
+ oc_dec_opt_vtable opt_vtable;
+# endif
+# if defined(HAVE_CAIRO)
+ /*Output metrics for debugging.*/
+ int telemetry_mbmode;
+ int telemetry_mv;
+ int telemetry_qi;
+ int telemetry_bits;
+ int telemetry_frame_bytes;
+ int telemetry_coding_bytes;
+ int telemetry_mode_bytes;
+ int telemetry_mv_bytes;
+ int telemetry_qi_bytes;
+ int telemetry_dc_bytes;
+ unsigned char *telemetry_frame_data;
+# endif
+};
+
+/*Default pure-C implementations of decoder-specific accelerated functions.*/
+void oc_dec_accel_init_c(oc_dec_ctx *_dec);
+
+void oc_dec_dc_unpredict_mcu_plane_c(oc_dec_ctx *_dec,
+ oc_dec_pipeline_state *_pipe,int _pli);
+
+#endif