/* * * Copyright (C) 2003 the ffmpeg project * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2 of the License, or (at your option) any later version. * * This library 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 * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA * * VP3 Video Decoder by Mike Melanson (melanson@pcisys.net) * */ /** * @file vp3.c * On2 VP3 Video Decoder */ #include #include #include #include #include "common.h" #include "avcodec.h" #include "dsputil.h" #include "mpegvideo.h" #include "dsputil.h" #include "bswap.h" #include "vp3data.h" #define FRAGMENT_PIXELS 8 /* * Debugging Variables * * Define one or more of the following compile-time variables to 1 to obtain * elaborate information about certain aspects of the decoding process. * * KEYFRAMES_ONLY: set this to 1 to only see keyframes (VP3 slideshow mode) * DEBUG_VP3: high-level decoding flow * DEBUG_INIT: initialization parameters * DEBUG_DEQUANTIZERS: display how the dequanization tables are built * DEBUG_BLOCK_CODING: unpacking the superblock/macroblock/fragment coding * DEBUG_MODES: unpacking the coding modes for individual fragments * DEBUG_VECTORS: display the motion vectors * DEBUG_TOKEN: display exhaustive information about each DCT token * DEBUG_VLC: display the VLCs as they are extracted from the stream * DEBUG_DC_PRED: display the process of reversing DC prediction * DEBUG_IDCT: show every detail of the IDCT process */ #define KEYFRAMES_ONLY 0 #define DEBUG_VP3 0 #define DEBUG_INIT 0 #define DEBUG_DEQUANTIZERS 0 #define DEBUG_BLOCK_CODING 0 #define DEBUG_MODES 0 #define DEBUG_VECTORS 0 #define DEBUG_TOKEN 0 #define DEBUG_VLC 0 #define DEBUG_DC_PRED 0 #define DEBUG_IDCT 0 #if DEBUG_VP3 #define debug_vp3 printf #else static inline void debug_vp3(const char *format, ...) { } #endif #if DEBUG_INIT #define debug_init printf #else static inline void debug_init(const char *format, ...) { } #endif #if DEBUG_DEQUANTIZERS #define debug_dequantizers printf #else static inline void debug_dequantizers(const char *format, ...) { } #endif #if DEBUG_BLOCK_CODING #define debug_block_coding printf #else static inline void debug_block_coding(const char *format, ...) { } #endif #if DEBUG_MODES #define debug_modes printf #else static inline void debug_modes(const char *format, ...) { } #endif #if DEBUG_VECTORS #define debug_vectors printf #else static inline void debug_vectors(const char *format, ...) { } #endif #if DEBUG_TOKEN #define debug_token printf #else static inline void debug_token(const char *format, ...) { } #endif #if DEBUG_VLC #define debug_vlc printf #else static inline void debug_vlc(const char *format, ...) { } #endif #if DEBUG_DC_PRED #define debug_dc_pred printf #else static inline void debug_dc_pred(const char *format, ...) { } #endif #if DEBUG_IDCT #define debug_idct printf #else static inline void debug_idct(const char *format, ...) { } #endif typedef struct Vp3Fragment { DCTELEM coeffs[64]; int coding_method; int coeff_count; int last_coeff; int motion_x; int motion_y; /* this indicates which ffmpeg put_pixels() function to use: * 00b = no halfpel, 01b = x halfpel, 10b = y halfpel, 11b = both halfpel */ int motion_halfpel_index; /* address of first pixel taking into account which plane the fragment * lives on as well as the plane stride */ int first_pixel; /* this is the macroblock that the fragment belongs to */ int macroblock; } Vp3Fragment; #define SB_NOT_CODED 0 #define SB_PARTIALLY_CODED 1 #define SB_FULLY_CODED 2 #define MODE_INTER_NO_MV 0 #define MODE_INTRA 1 #define MODE_INTER_PLUS_MV 2 #define MODE_INTER_LAST_MV 3 #define MODE_INTER_PRIOR_LAST 4 #define MODE_USING_GOLDEN 5 #define MODE_GOLDEN_MV 6 #define MODE_INTER_FOURMV 7 #define CODING_MODE_COUNT 8 /* special internal mode */ #define MODE_COPY 8 /* There are 6 preset schemes, plus a free-form scheme */ static int ModeAlphabet[7][CODING_MODE_COUNT] = { /* this is the custom scheme */ { 0, 0, 0, 0, 0, 0, 0, 0 }, /* scheme 1: Last motion vector dominates */ { MODE_INTER_LAST_MV, MODE_INTER_PRIOR_LAST, MODE_INTER_PLUS_MV, MODE_INTER_NO_MV, MODE_INTRA, MODE_USING_GOLDEN, MODE_GOLDEN_MV, MODE_INTER_FOURMV }, /* scheme 2 */ { MODE_INTER_LAST_MV, MODE_INTER_PRIOR_LAST, MODE_INTER_NO_MV, MODE_INTER_PLUS_MV, MODE_INTRA, MODE_USING_GOLDEN, MODE_GOLDEN_MV, MODE_INTER_FOURMV }, /* scheme 3 */ { MODE_INTER_LAST_MV, MODE_INTER_PLUS_MV, MODE_INTER_PRIOR_LAST, MODE_INTER_NO_MV, MODE_INTRA, MODE_USING_GOLDEN, MODE_GOLDEN_MV, MODE_INTER_FOURMV }, /* scheme 4 */ { MODE_INTER_LAST_MV, MODE_INTER_PLUS_MV, MODE_INTER_NO_MV, MODE_INTER_PRIOR_LAST, MODE_INTRA, MODE_USING_GOLDEN, MODE_GOLDEN_MV, MODE_INTER_FOURMV }, /* scheme 5: No motion vector dominates */ { MODE_INTER_NO_MV, MODE_INTER_LAST_MV, MODE_INTER_PRIOR_LAST, MODE_INTER_PLUS_MV, MODE_INTRA, MODE_USING_GOLDEN, MODE_GOLDEN_MV, MODE_INTER_FOURMV }, /* scheme 6 */ { MODE_INTER_NO_MV, MODE_USING_GOLDEN, MODE_INTER_LAST_MV, MODE_INTER_PRIOR_LAST, MODE_INTER_PLUS_MV, MODE_INTRA, MODE_GOLDEN_MV, MODE_INTER_FOURMV }, }; #define MIN_DEQUANT_VAL 2 typedef struct Vp3DecodeContext { AVCodecContext *avctx; int width, height; AVFrame golden_frame; AVFrame last_frame; AVFrame current_frame; int keyframe; DSPContext dsp; int quality_index; int last_quality_index; int superblock_count; int superblock_width; int superblock_height; int y_superblock_width; int y_superblock_height; int c_superblock_width; int c_superblock_height; int u_superblock_start; int v_superblock_start; unsigned char *superblock_coding; int macroblock_count; int macroblock_width; int macroblock_height; int fragment_count; int fragment_width; int fragment_height; Vp3Fragment *all_fragments; int u_fragment_start; int v_fragment_start; /* this is a list of indices into the all_fragments array indicating * which of the fragments are coded */ int *coded_fragment_list; int coded_fragment_list_index; int pixel_addresses_inited; VLC dc_vlc[16]; VLC ac_vlc_1[16]; VLC ac_vlc_2[16]; VLC ac_vlc_3[16]; VLC ac_vlc_4[16]; int16_t intra_y_dequant[64]; int16_t intra_c_dequant[64]; int16_t inter_dequant[64]; /* This table contains superblock_count * 16 entries. Each set of 16 * numbers corresponds to the fragment indices 0..15 of the superblock. * An entry will be -1 to indicate that no entry corresponds to that * index. */ int *superblock_fragments; /* This table contains superblock_count * 4 entries. Each set of 4 * numbers corresponds to the macroblock indices 0..3 of the superblock. * An entry will be -1 to indicate that no entry corresponds to that * index. */ int *superblock_macroblocks; /* This table contains macroblock_count * 6 entries. Each set of 6 * numbers corresponds to the fragment indices 0..5 which comprise * the macroblock (4 Y fragments and 2 C fragments). */ int *macroblock_fragments; /* This is an array that indicates how a particular macroblock * is coded. */ unsigned char *macroblock_coding; int first_coded_y_fragment; int first_coded_c_fragment; int last_coded_y_fragment; int last_coded_c_fragment; } Vp3DecodeContext; /************************************************************************ * VP3 specific functions ************************************************************************/ /* * This function sets up all of the various blocks mappings: * superblocks <-> fragments, macroblocks <-> fragments, * superblocks <-> macroblocks * * Returns 0 is successful; returns 1 if *anything* went wrong. */ static int init_block_mapping(Vp3DecodeContext *s) { int i, j; signed int hilbert_walk_y[16]; signed int hilbert_walk_c[16]; signed int hilbert_walk_mb[4]; int current_fragment = 0; int current_width = 0; int current_height = 0; int right_edge = 0; int bottom_edge = 0; int superblock_row_inc = 0; int *hilbert = NULL; int mapping_index = 0; int current_macroblock; int c_fragment; signed char travel_width[16] = { 1, 1, 0, -1, 0, 0, 1, 0, 1, 0, 1, 0, 0, -1, 0, 1 }; signed char travel_height[16] = { 0, 0, 1, 0, 1, 1, 0, -1, 0, 1, 0, -1, -1, 0, -1, 0 }; signed char travel_width_mb[4] = { 1, 0, 1, 0 }; signed char travel_height_mb[4] = { 0, 1, 0, -1 }; debug_vp3(" vp3: initialize block mapping tables\n"); /* figure out hilbert pattern per these frame dimensions */ hilbert_walk_y[0] = 1; hilbert_walk_y[1] = 1; hilbert_walk_y[2] = s->fragment_width; hilbert_walk_y[3] = -1; hilbert_walk_y[4] = s->fragment_width; hilbert_walk_y[5] = s->fragment_width; hilbert_walk_y[6] = 1; hilbert_walk_y[7] = -s->fragment_width; hilbert_walk_y[8] = 1; hilbert_walk_y[9] = s->fragment_width; hilbert_walk_y[10] = 1; hilbert_walk_y[11] = -s->fragment_width; hilbert_walk_y[12] = -s->fragment_width; hilbert_walk_y[13] = -1; hilbert_walk_y[14] = -s->fragment_width; hilbert_walk_y[15] = 1; hilbert_walk_c[0] = 1; hilbert_walk_c[1] = 1; hilbert_walk_c[2] = s->fragment_width / 2; hilbert_walk_c[3] = -1; hilbert_walk_c[4] = s->fragment_width / 2; hilbert_walk_c[5] = s->fragment_width / 2; hilbert_walk_c[6] = 1; hilbert_walk_c[7] = -s->fragment_width / 2; hilbert_walk_c[8] = 1; hilbert_walk_c[9] = s->fragment_width / 2; hilbert_walk_c[10] = 1; hilbert_walk_c[11] = -s->fragment_width / 2; hilbert_walk_c[12] = -s->fragment_width / 2; hilbert_walk_c[13] = -1; hilbert_walk_c[14] = -s->fragment_width / 2; hilbert_walk_c[15] = 1; hilbert_walk_mb[0] = 1; hilbert_walk_mb[1] = s->macroblock_width; hilbert_walk_mb[2] = 1; hilbert_walk_mb[3] = -s->macroblock_width; /* iterate through each superblock (all planes) and map the fragments */ for (i = 0; i < s->superblock_count; i++) { debug_init(" superblock %d (u starts @ %d, v starts @ %d)\n", i, s->u_superblock_start, s->v_superblock_start); /* time to re-assign the limits? */ if (i == 0) { /* start of Y superblocks */ right_edge = s->fragment_width; bottom_edge = s->fragment_height; current_width = -1; current_height = 0; superblock_row_inc = 3 * s->fragment_width - (s->y_superblock_width * 4 - s->fragment_width); hilbert = hilbert_walk_y; /* the first operation for this variable is to advance by 1 */ current_fragment = -1; } else if (i == s->u_superblock_start) { /* start of U superblocks */ right_edge = s->fragment_width / 2; bottom_edge = s->fragment_height / 2; current_width = -1; current_height = 0; superblock_row_inc = 3 * (s->fragment_width / 2) - (s->c_superblock_width * 4 - s->fragment_width / 2); hilbert = hilbert_walk_c; /* the first operation for this variable is to advance by 1 */ current_fragment = s->u_fragment_start - 1; } else if (i == s->v_superblock_start) { /* start of V superblocks */ right_edge = s->fragment_width / 2; bottom_edge = s->fragment_height / 2; current_width = -1; current_height = 0; superblock_row_inc = 3 * (s->fragment_width / 2) - (s->c_superblock_width * 4 - s->fragment_width / 2); hilbert = hilbert_walk_c; /* the first operation for this variable is to advance by 1 */ current_fragment = s->v_fragment_start - 1; } if (current_width >= right_edge - 1) { /* reset width and move to next superblock row */ current_width = -1; current_height += 4; /* fragment is now at the start of a new superblock row */ current_fragment += superblock_row_inc; } /* iterate through all 16 fragments in a superblock */ for (j = 0; j < 16; j++) { current_fragment += hilbert[j]; current_width += travel_width[j]; current_height += travel_height[j]; /* check if the fragment is in bounds */ if ((current_width < right_edge) && (current_height < bottom_edge)) { s->superblock_fragments[mapping_index] = current_fragment; debug_init(" mapping fragment %d to superblock %d, position %d (%d/%d x %d/%d)\n", s->superblock_fragments[mapping_index], i, j, current_width, right_edge, current_height, bottom_edge); } else { s->superblock_fragments[mapping_index] = -1; debug_init(" superblock %d, position %d has no fragment (%d/%d x %d/%d)\n", i, j, current_width, right_edge, current_height, bottom_edge); } mapping_index++; } } /* initialize the superblock <-> macroblock mapping; iterate through * all of the Y plane superblocks to build this mapping */ right_edge = s->macroblock_width; bottom_edge = s->macroblock_height; current_width = -1; current_height = 0; superblock_row_inc = s->macroblock_width - (s->y_superblock_width * 2 - s->macroblock_width);; hilbert = hilbert_walk_mb; mapping_index = 0; current_macroblock = -1; for (i = 0; i < s->u_superblock_start; i++) { if (current_width >= right_edge - 1) { /* reset width and move to next superblock row */ current_width = -1; current_height += 2; /* macroblock is now at the start of a new superblock row */ current_macroblock += superblock_row_inc; } /* iterate through each potential macroblock in the superblock */ for (j = 0; j < 4; j++) { current_macroblock += hilbert_walk_mb[j]; current_width += travel_width_mb[j]; current_height += travel_height_mb[j]; /* check if the macroblock is in bounds */ if ((current_width < right_edge) && (current_height < bottom_edge)) { s->superblock_macroblocks[mapping_index] = current_macroblock; debug_init(" mapping macroblock %d to superblock %d, position %d (%d/%d x %d/%d)\n", s->superblock_macroblocks[mapping_index], i, j, current_width, right_edge, current_height, bottom_edge); } else { s->superblock_macroblocks[mapping_index] = -1; debug_init(" superblock %d, position %d has no macroblock (%d/%d x %d/%d)\n", i, j, current_width, right_edge, current_height, bottom_edge); } mapping_index++; } } /* initialize the macroblock <-> fragment mapping */ current_fragment = 0; current_macroblock = 0; mapping_index = 0; for (i = 0; i < s->fragment_height; i += 2) { for (j = 0; j < s->fragment_width; j += 2) { debug_init(" macroblock %d contains fragments: ", current_macroblock); s->all_fragments[current_fragment].macroblock = current_macroblock; s->macroblock_fragments[mapping_index++] = current_fragment; debug_init("%d ", current_fragment); if (j + 1 < s->fragment_width) { s->all_fragments[current_fragment + 1].macroblock = current_macroblock; s->macroblock_fragments[mapping_index++] = current_fragment + 1; debug_init("%d ", current_fragment + 1); } else s->macroblock_fragments[mapping_index++] = -1; if (i + 1 < s->fragment_height) { s->all_fragments[current_fragment + s->fragment_width].macroblock = current_macroblock; s->macroblock_fragments[mapping_index++] = current_fragment + s->fragment_width; debug_init("%d ", current_fragment + s->fragment_width); } else s->macroblock_fragments[mapping_index++] = -1; if ((j + 1 < s->fragment_width) && (i + 1 < s->fragment_height)) { s->all_fragments[current_fragment + s->fragment_width + 1].macroblock = current_macroblock; s->macroblock_fragments[mapping_index++] = current_fragment + s->fragment_width + 1; debug_init("%d ", current_fragment + s->fragment_width + 1); } else s->macroblock_fragments[mapping_index++] = -1; /* C planes */ c_fragment = s->u_fragment_start + (i * s->fragment_width / 4) + (j / 2); s->all_fragments[c_fragment].macroblock = s->macroblock_count; s->macroblock_fragments[mapping_index++] = c_fragment; debug_init("%d ", c_fragment); c_fragment = s->v_fragment_start + (i * s->fragment_width / 4) + (j / 2); s->all_fragments[c_fragment].macroblock = s->macroblock_count; s->macroblock_fragments[mapping_index++] = c_fragment; debug_init("%d ", c_fragment); debug_init("\n"); if (j + 2 <= s->fragment_width) current_fragment += 2; else current_fragment++; current_macroblock++; } current_fragment += s->fragment_width; } return 0; /* successful path out */ } /* * This function unpacks a single token (which should be in the range 0..31) * and returns a zero run (number of zero coefficients in current DCT matrix * before next non-zero coefficient), the next DCT coefficient, and the * number of consecutive, non-EOB'd DCT blocks to EOB. */ static void unpack_token(GetBitContext *gb, int token, int *zero_run, DCTELEM *coeff, int *eob_run) { int sign; *zero_run = 0; *eob_run = 0; *coeff = 0; debug_token(" vp3 token %d: ", token); switch (token) { case 0: debug_token("DCT_EOB_TOKEN, EOB next block\n"); *eob_run = 1; break; case 1: debug_token("DCT_EOB_PAIR_TOKEN, EOB next 2 blocks\n"); *eob_run = 2; break; case 2: debug_token("DCT_EOB_TRIPLE_TOKEN, EOB next 3 blocks\n"); *eob_run = 3; break; case 3: debug_token("DCT_REPEAT_RUN_TOKEN, "); *eob_run = get_bits(gb, 2) + 4; debug_token("EOB the next %d blocks\n", *eob_run); break; case 4: debug_token("DCT_REPEAT_RUN2_TOKEN, "); *eob_run = get_bits(gb, 3) + 8; debug_token("EOB the next %d blocks\n", *eob_run); break; case 5: debug_token("DCT_REPEAT_RUN3_TOKEN, "); *eob_run = get_bits(gb, 4) + 16; debug_token("EOB the next %d blocks\n", *eob_run); break; case 6: debug_token("DCT_REPEAT_RUN4_TOKEN, "); *eob_run = get_bits(gb, 12); debug_token("EOB the next %d blocks\n", *eob_run); break; case 7: debug_token("DCT_SHORT_ZRL_TOKEN, "); /* note that this token actually indicates that (3 extra bits) + 1 0s * should be output; this case specifies a run of (3 EBs) 0s and a * coefficient of 0. */ *zero_run = get_bits(gb, 3); *coeff = 0; debug_token("skip the next %d positions in output matrix\n", *zero_run + 1); break; case 8: debug_token("DCT_ZRL_TOKEN, "); /* note that this token actually indicates that (6 extra bits) + 1 0s * should be output; this case specifies a run of (6 EBs) 0s and a * coefficient of 0. */ *zero_run = get_bits(gb, 6); *coeff = 0; debug_token("skip the next %d positions in output matrix\n", *zero_run + 1); break; case 9: debug_token("ONE_TOKEN, output 1\n"); *coeff = 1; break; case 10: debug_token("MINUS_ONE_TOKEN, output -1\n"); *coeff = -1; break; case 11: debug_token("TWO_TOKEN, output 2\n"); *coeff = 2; break; case 12: debug_token("MINUS_TWO_TOKEN, output -2\n"); *coeff = -2; break; case 13: case 14: case 15: case 16: debug_token("LOW_VAL_TOKENS, "); if (get_bits(gb, 1)) *coeff = -(3 + (token - 13)); else *coeff = 3 + (token - 13); debug_token("output %d\n", *coeff); break; case 17: debug_token("DCT_VAL_CATEGORY3, "); sign = get_bits(gb, 1); *coeff = 7 + get_bits(gb, 1); if (sign) *coeff = -(*coeff); debug_token("output %d\n", *coeff); break; case 18: debug_token("DCT_VAL_CATEGORY4, "); sign = get_bits(gb, 1); *coeff = 9 + get_bits(gb, 2); if (sign) *coeff = -(*coeff); debug_token("output %d\n", *coeff); break; case 19: debug_token("DCT_VAL_CATEGORY5, "); sign = get_bits(gb, 1); *coeff = 13 + get_bits(gb, 3); if (sign) *coeff = -(*coeff); debug_token("output %d\n", *coeff); break; case 20: debug_token("DCT_VAL_CATEGORY6, "); sign = get_bits(gb, 1); *coeff = 21 + get_bits(gb, 4); if (sign) *coeff = -(*coeff); debug_token("output %d\n", *coeff); break; case 21: debug_token("DCT_VAL_CATEGORY7, "); sign = get_bits(gb, 1); *coeff = 37 + get_bits(gb, 5); if (sign) *coeff = -(*coeff); debug_token("output %d\n", *coeff); break; case 22: debug_token("DCT_VAL_CATEGORY8, "); sign = get_bits(gb, 1); *coeff = 69 + get_bits(gb, 9); if (sign) *coeff = -(*coeff); debug_token("output %d\n", *coeff); break; case 23: case 24: case 25: case 26: case 27: debug_token("DCT_RUN_CATEGORY1, "); *zero_run = token - 22; if (get_bits(gb, 1)) *coeff = -1; else *coeff = 1; debug_token("output %d 0s, then %d\n", *zero_run, *coeff); break; case 28: debug_token("DCT_RUN_CATEGORY1B, "); if (get_bits(gb, 1)) *coeff = -1; else *coeff = 1; *zero_run = 6 + get_bits(gb, 2); debug_token("output %d 0s, then %d\n", *zero_run, *coeff); break; case 29: debug_token("DCT_RUN_CATEGORY1C, "); if (get_bits(gb, 1)) *coeff = -1; else *coeff = 1; *zero_run = 10 + get_bits(gb, 3); debug_token("output %d 0s, then %d\n", *zero_run, *coeff); break; case 30: debug_token("DCT_RUN_CATEGORY2, "); sign = get_bits(gb, 1); *coeff = 2 + get_bits(gb, 1); if (sign) *coeff = -(*coeff); *zero_run = 1; debug_token("output %d 0s, then %d\n", *zero_run, *coeff); break; case 31: debug_token("DCT_RUN_CATEGORY2, "); sign = get_bits(gb, 1); *coeff = 2 + get_bits(gb, 1); if (sign) *coeff = -(*coeff); *zero_run = 2 + get_bits(gb, 1); debug_token("output %d 0s, then %d\n", *zero_run, *coeff); break; default: printf (" vp3: help! Got a bad token: %d > 31\n", token); break; } } /* * This function wipes out all of the fragment data. */ static void init_frame(Vp3DecodeContext *s, GetBitContext *gb) { int i; /* zero out all of the fragment information */ s->coded_fragment_list_index = 0; for (i = 0; i < s->fragment_count; i++) { memset(s->all_fragments[i].coeffs, 0, 64 * sizeof(DCTELEM)); s->all_fragments[i].coeff_count = 0; s->all_fragments[i].last_coeff = 0; } } /* * This function sets of the dequantization tables used for a particular * frame. */ static void init_dequantizer(Vp3DecodeContext *s) { int quality_scale = vp31_quality_threshold[s->quality_index]; int dc_scale_factor = vp31_dc_scale_factor[s->quality_index]; int i, j; debug_vp3(" vp3: initializing dequantization tables\n"); /* * Scale dequantizers: * * quantizer * sf * -------------- * 100 * * where sf = dc_scale_factor for DC quantizer * or quality_scale for AC quantizer * * Then, saturate the result to a lower limit of MIN_DEQUANT_VAL. */ #define SCALER 1 /* scale DC quantizers */ s->intra_y_dequant[0] = vp31_intra_y_dequant[0] * dc_scale_factor / 100; if (s->intra_y_dequant[0] < MIN_DEQUANT_VAL * 2) s->intra_y_dequant[0] = MIN_DEQUANT_VAL * 2; s->intra_y_dequant[0] *= SCALER; s->intra_c_dequant[0] = vp31_intra_c_dequant[0] * dc_scale_factor / 100; if (s->intra_c_dequant[0] < MIN_DEQUANT_VAL * 2) s->intra_c_dequant[0] = MIN_DEQUANT_VAL * 2; s->intra_c_dequant[0] *= SCALER; s->inter_dequant[0] = vp31_inter_dequant[0] * dc_scale_factor / 100; if (s->inter_dequant[0] < MIN_DEQUANT_VAL * 4) s->inter_dequant[0] = MIN_DEQUANT_VAL * 4; s->inter_dequant[0] *= SCALER; /* scale AC quantizers, zigzag at the same time in preparation for * the dequantization phase */ for (i = 1; i < 64; i++) { j = zigzag_index[i]; s->intra_y_dequant[j] = vp31_intra_y_dequant[i] * quality_scale / 100; if (s->intra_y_dequant[j] < MIN_DEQUANT_VAL) s->intra_y_dequant[j] = MIN_DEQUANT_VAL; s->intra_y_dequant[j] *= SCALER; s->intra_c_dequant[j] = vp31_intra_c_dequant[i] * quality_scale / 100; if (s->intra_c_dequant[j] < MIN_DEQUANT_VAL) s->intra_c_dequant[j] = MIN_DEQUANT_VAL; s->intra_c_dequant[j] *= SCALER; s->inter_dequant[j] = vp31_inter_dequant[i] * quality_scale / 100; if (s->inter_dequant[j] < MIN_DEQUANT_VAL * 2) s->inter_dequant[j] = MIN_DEQUANT_VAL * 2; s->inter_dequant[j] *= SCALER; } /* print debug information as requested */ debug_dequantizers("intra Y dequantizers:\n"); for (i = 0; i < 8; i++) { for (j = i * 8; j < i * 8 + 8; j++) { debug_dequantizers(" %4d,", s->intra_y_dequant[j]); } debug_dequantizers("\n"); } debug_dequantizers("\n"); debug_dequantizers("intra C dequantizers:\n"); for (i = 0; i < 8; i++) { for (j = i * 8; j < i * 8 + 8; j++) { debug_dequantizers(" %4d,", s->intra_c_dequant[j]); } debug_dequantizers("\n"); } debug_dequantizers("\n"); debug_dequantizers("interframe dequantizers:\n"); for (i = 0; i < 8; i++) { for (j = i * 8; j < i * 8 + 8; j++) { debug_dequantizers(" %4d,", s->inter_dequant[j]); } debug_dequantizers("\n"); } debug_dequantizers("\n"); } /* * This function is used to fetch runs of 1s or 0s from the bitstream for * use in determining which superblocks are fully and partially coded. * * Codeword RunLength * 0 1 * 10x 2-3 * 110x 4-5 * 1110xx 6-9 * 11110xxx 10-17 * 111110xxxx 18-33 * 111111xxxxxxxxxxxx 34-4129 */ static int get_superblock_run_length(GetBitContext *gb) { if (get_bits(gb, 1) == 0) return 1; else if (get_bits(gb, 1) == 0) return (2 + get_bits(gb, 1)); else if (get_bits(gb, 1) == 0) return (4 + get_bits(gb, 1)); else if (get_bits(gb, 1) == 0) return (6 + get_bits(gb, 2)); else if (get_bits(gb, 1) == 0) return (10 + get_bits(gb, 3)); else if (get_bits(gb, 1) == 0) return (18 + get_bits(gb, 4)); else return (34 + get_bits(gb, 12)); } /* * This function is used to fetch runs of 1s or 0s from the bitstream for * use in determining which particular fragments are coded. * * Codeword RunLength * 0x 1-2 * 10x 3-4 * 110x 5-6 * 1110xx 7-10 * 11110xx 11-14 * 11111xxxx 15-30 */ static int get_fragment_run_length(GetBitContext *gb) { if (get_bits(gb, 1) == 0) return (1 + get_bits(gb, 1)); else if (get_bits(gb, 1) == 0) return (3 + get_bits(gb, 1)); else if (get_bits(gb, 1) == 0) return (5 + get_bits(gb, 1)); else if (get_bits(gb, 1) == 0) return (7 + get_bits(gb, 2)); else if (get_bits(gb, 1) == 0) return (11 + get_bits(gb, 2)); else return (15 + get_bits(gb, 4)); } /* * This function decodes a VLC from the bitstream and returns a number * that ranges from 0..7. The number indicates which of the 8 coding * modes to use. * * VLC Number * 0 0 * 10 1 * 110 2 * 1110 3 * 11110 4 * 111110 5 * 1111110 6 * 1111111 7 * */ static int get_mode_code(GetBitContext *gb) { if (get_bits(gb, 1) == 0) return 0; else if (get_bits(gb, 1) == 0) return 1; else if (get_bits(gb, 1) == 0) return 2; else if (get_bits(gb, 1) == 0) return 3; else if (get_bits(gb, 1) == 0) return 4; else if (get_bits(gb, 1) == 0) return 5; else if (get_bits(gb, 1) == 0) return 6; else return 7; } /* * This function extracts a motion vector from the bitstream using a VLC * scheme. 3 bits are fetched from the bitstream and 1 of 8 actions is * taken depending on the value on those 3 bits: * * 0: return 0 * 1: return 1 * 2: return -1 * 3: if (next bit is 1) return -2, else return 2 * 4: if (next bit is 1) return -3, else return 3 * 5: return 4 + (next 2 bits), next bit is sign * 6: return 8 + (next 3 bits), next bit is sign * 7: return 16 + (next 4 bits), next bit is sign */ static int get_motion_vector_vlc(GetBitContext *gb) { int bits; bits = get_bits(gb, 3); switch(bits) { case 0: bits = 0; break; case 1: bits = 1; break; case 2: bits = -1; break; case 3: if (get_bits(gb, 1) == 0) bits = 2; else bits = -2; break; case 4: if (get_bits(gb, 1) == 0) bits = 3; else bits = -3; break; case 5: bits = 4 + get_bits(gb, 2); if (get_bits(gb, 1) == 1) bits = -bits; break; case 6: bits = 8 + get_bits(gb, 3); if (get_bits(gb, 1) == 1) bits = -bits; break; case 7: bits = 16 + get_bits(gb, 4); if (get_bits(gb, 1) == 1) bits = -bits; break; } return bits; } /* * This function fetches a 5-bit number from the stream followed by * a sign and calls it a motion vector. */ static int get_motion_vector_fixed(GetBitContext *gb) { int bits; bits = get_bits(gb, 5); if (get_bits(gb, 1) == 1) bits = -bits; return bits; } /* * This function unpacks all of the superblock/macroblock/fragment coding * information from the bitstream. */ static int unpack_superblocks(Vp3DecodeContext *s, GetBitContext *gb) { int bit = 0; int current_superblock = 0; int current_run = 0; int decode_fully_flags = 0; int decode_partial_blocks = 0; int first_c_fragment_seen; int i, j; int current_fragment; debug_vp3(" vp3: unpacking superblock coding\n"); if (s->keyframe) { debug_vp3(" keyframe-- all superblocks are fully coded\n"); memset(s->superblock_coding, SB_FULLY_CODED, s->superblock_count); } else { /* unpack the list of partially-coded superblocks */ bit = get_bits(gb, 1); /* toggle the bit because as soon as the first run length is * fetched the bit will be toggled again */ bit ^= 1; while (current_superblock < s->superblock_count) { if (current_run == 0) { bit ^= 1; current_run = get_superblock_run_length(gb); debug_block_coding(" setting superblocks %d..%d to %s\n", current_superblock, current_superblock + current_run - 1, (bit) ? "partially coded" : "not coded"); /* if any of the superblocks are not partially coded, flag * a boolean to decode the list of fully-coded superblocks */ if (bit == 0) decode_fully_flags = 1; } else { /* make a note of the fact that there are partially coded * superblocks */ decode_partial_blocks = 1; } s->superblock_coding[current_superblock++] = (bit) ? SB_PARTIALLY_CODED : SB_NOT_CODED; current_run--; } /* unpack the list of fully coded superblocks if any of the blocks were * not marked as partially coded in the previous step */ if (decode_fully_flags) { current_superblock = 0; current_run = 0; bit = get_bits(gb, 1); /* toggle the bit because as soon as the first run length is * fetched the bit will be toggled again */ bit ^= 1; while (current_superblock < s->superblock_count) { /* skip any superblocks already marked as partially coded */ if (s->superblock_coding[current_superblock] == SB_NOT_CODED) { if (current_run == 0) { bit ^= 1; current_run = get_superblock_run_length(gb); } debug_block_coding(" setting superblock %d to %s\n", current_superblock, (bit) ? "fully coded" : "not coded"); s->superblock_coding[current_superblock] = (bit) ? SB_FULLY_CODED : SB_NOT_CODED; current_run--; } current_superblock++; } } /* if there were partial blocks, initialize bitstream for * unpacking fragment codings */ if (decode_partial_blocks) { current_run = 0; bit = get_bits(gb, 1); /* toggle the bit because as soon as the first run length is * fetched the bit will be toggled again */ bit ^= 1; } } /* figure out which fragments are coded; iterate through each * superblock (all planes) */ s->coded_fragment_list_index = 0; s->first_coded_y_fragment = s->first_coded_c_fragment = 0; s->last_coded_y_fragment = s->last_coded_c_fragment = -1; first_c_fragment_seen = 0; memset(s->macroblock_coding, MODE_COPY, s->macroblock_count); for (i = 0; i < s->superblock_count; i++) { /* iterate through all 16 fragments in a superblock */ for (j = 0; j < 16; j++) { /* if the fragment is in bounds, check its coding status */ current_fragment = s->superblock_fragments[i * 16 + j]; if (current_fragment >= s->fragment_count) { printf (" vp3:unpack_superblocks(): bad fragment number (%d >= %d)\n", current_fragment, s->fragment_count); return 1; } if (current_fragment != -1) { if (s->superblock_coding[i] == SB_NOT_CODED) { /* copy all the fragments from the prior frame */ s->all_fragments[current_fragment].coding_method = MODE_COPY; } else if (s->superblock_coding[i] == SB_PARTIALLY_CODED) { /* fragment may or may not be coded; this is the case * that cares about the fragment coding runs */ if (current_run == 0) { bit ^= 1; current_run = get_fragment_run_length(gb); } if (bit) { /* default mode; actual mode will be decoded in * the next phase */ s->all_fragments[current_fragment].coding_method = MODE_INTER_NO_MV; s->coded_fragment_list[s->coded_fragment_list_index] = current_fragment; if ((current_fragment >= s->u_fragment_start) && (s->last_coded_y_fragment == -1) && (!first_c_fragment_seen)) { s->first_coded_c_fragment = s->coded_fragment_list_index; s->last_coded_y_fragment = s->first_coded_c_fragment - 1; first_c_fragment_seen = 1; } s->coded_fragment_list_index++; s->macroblock_coding[s->all_fragments[current_fragment].macroblock] = MODE_INTER_NO_MV; debug_block_coding(" superblock %d is partially coded, fragment %d is coded\n", i, current_fragment); } else { /* not coded; copy this fragment from the prior frame */ s->all_fragments[current_fragment].coding_method = MODE_COPY; debug_block_coding(" superblock %d is partially coded, fragment %d is not coded\n", i, current_fragment); } current_run--; } else { /* fragments are fully coded in this superblock; actual * coding will be determined in next step */ s->all_fragments[current_fragment].coding_method = MODE_INTER_NO_MV; s->coded_fragment_list[s->coded_fragment_list_index] = current_fragment; if ((current_fragment >= s->u_fragment_start) && (s->last_coded_y_fragment == -1) && (!first_c_fragment_seen)) { s->first_coded_c_fragment = s->coded_fragment_list_index; s->last_coded_y_fragment = s->first_coded_c_fragment - 1; first_c_fragment_seen = 1; } s->coded_fragment_list_index++; s->macroblock_coding[s->all_fragments[current_fragment].macroblock] = MODE_INTER_NO_MV; debug_block_coding(" superblock %d is fully coded, fragment %d is coded\n", i, current_fragment); } } } } if (!first_c_fragment_seen) /* only Y fragments coded in this frame */ s->last_coded_y_fragment = s->coded_fragment_list_index - 1; else /* end the list of coded fragments */ s->last_coded_c_fragment = s->coded_fragment_list_index - 1; debug_block_coding(" %d total coded fragments, y: %d -> %d, c: %d -> %d\n", s->coded_fragment_list_index, s->first_coded_y_fragment, s->last_coded_y_fragment, s->first_coded_c_fragment, s->last_coded_c_fragment); return 0; } /* * This function unpacks all the coding mode data for individual macroblocks * from the bitstream. */ static int unpack_modes(Vp3DecodeContext *s, GetBitContext *gb) { int i, j, k; int scheme; int current_macroblock; int current_fragment; int coding_mode; debug_vp3(" vp3: unpacking encoding modes\n"); if (s->keyframe) { debug_vp3(" keyframe-- all blocks are coded as INTRA\n"); for (i = 0; i < s->fragment_count; i++) s->all_fragments[i].coding_method = MODE_INTRA; } else { /* fetch the mode coding scheme for this frame */ scheme = get_bits(gb, 3); debug_modes(" using mode alphabet %d\n", scheme); /* is it a custom coding scheme? */ if (scheme == 0) { debug_modes(" custom mode alphabet ahead:\n"); for (i = 0; i < 8; i++) ModeAlphabet[scheme][get_bits(gb, 3)] = i; } for (i = 0; i < 8; i++) debug_modes(" mode[%d][%d] = %d\n", scheme, i, ModeAlphabet[scheme][i]); /* iterate through all of the macroblocks that contain 1 or more * coded fragments */ for (i = 0; i < s->u_superblock_start; i++) { for (j = 0; j < 4; j++) { current_macroblock = s->superblock_macroblocks[i * 4 + j]; if ((current_macroblock == -1) || (s->macroblock_coding[current_macroblock] == MODE_COPY)) continue; if (current_macroblock >= s->macroblock_count) { printf (" vp3:unpack_modes(): bad macroblock number (%d >= %d)\n", current_macroblock, s->macroblock_count); return 1; } /* mode 7 means get 3 bits for each coding mode */ if (scheme == 7) coding_mode = get_bits(gb, 3); else coding_mode = ModeAlphabet[scheme][get_mode_code(gb)]; s->macroblock_coding[current_macroblock] = coding_mode; for (k = 0; k < 6; k++) { current_fragment = s->macroblock_fragments[current_macroblock * 6 + k]; if (current_fragment == -1) continue; if (current_fragment >= s->fragment_count) { printf (" vp3:unpack_modes(): bad fragment number (%d >= %d)\n", current_fragment, s->fragment_count); return 1; } if (s->all_fragments[current_fragment].coding_method != MODE_COPY) s->all_fragments[current_fragment].coding_method = coding_mode; } debug_modes(" coding method for macroblock starting @ fragment %d = %d\n", s->macroblock_fragments[current_macroblock * 6], coding_mode); } } } return 0; } /* * This function adjusts the components of a motion vector for the halfpel * motion grid. c_plane indicates whether the vector applies to the U or V * plane. The function returns the halfpel function index to be used in * ffmpeg's put_pixels[]() array of functions. */ static inline int adjust_vector(int *x, int *y, int c_plane) { int motion_halfpel_index = 0; int x_halfpel; int y_halfpel; if (!c_plane) { x_halfpel = *x & 1; motion_halfpel_index |= x_halfpel; if (*x >= 0) *x >>= 1; else *x = -( (-(*x) >> 1) + x_halfpel); y_halfpel = *y & 1; motion_halfpel_index |= (y_halfpel << 1); if (*y >= 0) *y >>= 1; else *y = -( (-(*y) >> 1) + y_halfpel); } else { x_halfpel = ((*x & 0x03) != 0); motion_halfpel_index |= x_halfpel; if (*x >= 0) *x >>= 2; else *x = -( (-(*x) >> 2) + x_halfpel); y_halfpel = ((*y & 0x03) != 0); motion_halfpel_index |= (y_halfpel << 1); if (*y >= 0) *y >>= 2; else *y = -( (-(*y) >> 2) + y_halfpel); } return motion_halfpel_index; } /* * This function unpacks all the motion vectors for the individual * macroblocks from the bitstream. */ static int unpack_vectors(Vp3DecodeContext *s, GetBitContext *gb) { int i, j, k; int coding_mode; int motion_x[6]; int motion_y[6]; int last_motion_x = 0; int last_motion_y = 0; int prior_last_motion_x = 0; int prior_last_motion_y = 0; int current_macroblock; int current_fragment; debug_vp3(" vp3: unpacking motion vectors\n"); if (s->keyframe) { debug_vp3(" keyframe-- there are no motion vectors\n"); } else { memset(motion_x, 0, 6 * sizeof(int)); memset(motion_y, 0, 6 * sizeof(int)); /* coding mode 0 is the VLC scheme; 1 is the fixed code scheme */ coding_mode = get_bits(gb, 1); debug_vectors(" using %s scheme for unpacking motion vectors\n", (coding_mode == 0) ? "VLC" : "fixed-length"); /* iterate through all of the macroblocks that contain 1 or more * coded fragments */ for (i = 0; i < s->u_superblock_start; i++) { for (j = 0; j < 4; j++) { current_macroblock = s->superblock_macroblocks[i * 4 + j]; if ((current_macroblock == -1) || (s->macroblock_coding[current_macroblock] == MODE_COPY)) continue; if (current_macroblock >= s->macroblock_count) { printf (" vp3:unpack_vectors(): bad macroblock number (%d >= %d)\n", current_macroblock, s->macroblock_count); return 1; } current_fragment = s->macroblock_fragments[current_macroblock * 6]; if (current_fragment >= s->fragment_count) { printf (" vp3:unpack_vectors(): bad fragment number (%d >= %d\n", current_fragment, s->fragment_count); return 1; } switch (s->macroblock_coding[current_macroblock]) { case MODE_INTER_PLUS_MV: case MODE_GOLDEN_MV: /* all 6 fragments use the same motion vector */ if (coding_mode == 0) { motion_x[0] = get_motion_vector_vlc(gb); motion_y[0] = get_motion_vector_vlc(gb); } else { motion_x[0] = get_motion_vector_fixed(gb); motion_y[0] = get_motion_vector_fixed(gb); } for (k = 1; k < 6; k++) { motion_x[k] = motion_x[0]; motion_y[k] = motion_y[0]; } /* vector maintenance, only on MODE_INTER_PLUS_MV */ if (s->all_fragments[current_fragment].coding_method == MODE_INTER_PLUS_MV) { prior_last_motion_x = last_motion_x; prior_last_motion_y = last_motion_y; last_motion_x = motion_x[0]; last_motion_y = motion_y[0]; } break; case MODE_INTER_FOURMV: /* fetch 4 vectors from the bitstream, one for each * Y fragment, then average for the C fragment vectors */ motion_x[4] = motion_y[4] = 0; for (k = 0; k < 4; k++) { if (coding_mode == 0) { motion_x[k] = get_motion_vector_vlc(gb); motion_y[k] = get_motion_vector_vlc(gb); } else { motion_x[k] = get_motion_vector_fixed(gb); motion_y[k] = get_motion_vector_fixed(gb); } motion_x[4] += motion_x[k]; motion_y[4] += motion_y[k]; } if (motion_x[4] >= 0) motion_x[4] = (motion_x[4] + 2) / 4; else motion_x[4] = (motion_x[4] - 2) / 4; motion_x[5] = motion_x[4]; if (motion_y[4] >= 0) motion_y[4] = (motion_y[4] + 2) / 4; else motion_y[4] = (motion_y[4] - 2) / 4; motion_y[5] = motion_y[4]; /* vector maintenance; vector[3] is treated as the * last vector in this case */ prior_last_motion_x = last_motion_x; prior_last_motion_y = last_motion_y; last_motion_x = motion_x[3]; last_motion_y = motion_y[3]; break; case MODE_INTER_LAST_MV: /* all 6 fragments use the last motion vector */ motion_x[0] = last_motion_x; motion_y[0] = last_motion_y; for (k = 1; k < 6; k++) { motion_x[k] = motion_x[0]; motion_y[k] = motion_y[0]; } /* no vector maintenance (last vector remains the * last vector) */ break; case MODE_INTER_PRIOR_LAST: /* all 6 fragments use the motion vector prior to the * last motion vector */ motion_x[0] = prior_last_motion_x; motion_y[0] = prior_last_motion_y; for (k = 1; k < 6; k++) { motion_x[k] = motion_x[0]; motion_y[k] = motion_y[0]; } /* vector maintenance */ prior_last_motion_x = last_motion_x; prior_last_motion_y = last_motion_y; last_motion_x = motion_x[0]; last_motion_y = motion_y[0]; break; default: /* covers intra, inter without MV, golden without MV */ memset(motion_x, 0, 6 * sizeof(int)); memset(motion_y, 0, 6 * sizeof(int)); /* no vector maintenance */ break; } /* assign the motion vectors to the correct fragments */ debug_vectors(" vectors for macroblock starting @ fragment %d (coding method %d):\n", current_fragment, s->all_fragments[current_fragment].coding_method); for (k = 0; k < 6; k++) { current_fragment = s->macroblock_fragments[current_macroblock * 6 + k]; if (current_fragment == -1) continue; if (current_fragment >= s->fragment_count) { printf (" vp3:unpack_vectors(): bad fragment number (%d >= %d)\n", current_fragment, s->fragment_count); return 1; } s->all_fragments[current_fragment].motion_halfpel_index = adjust_vector(&motion_x[k], &motion_y[k], ((k == 4) || (k == 5))); s->all_fragments[current_fragment].motion_x = motion_x[k]; s->all_fragments[current_fragment].motion_y = motion_y[k]; debug_vectors(" vector %d: fragment %d = (%d, %d), index %d\n", k, current_fragment, motion_x[k], motion_y[k], s->all_fragments[current_fragment].motion_halfpel_index); } } } } return 0; } /* * This function is called by unpack_dct_coeffs() to extract the VLCs from * the bitstream. The VLCs encode tokens which are used to unpack DCT * data. This function unpacks all the VLCs for either the Y plane or both * C planes, and is called for DC coefficients or different AC coefficient * levels (since different coefficient types require different VLC tables. * * This function returns a residual eob run. E.g, if a particular token gave * instructions to EOB the next 5 fragments and there were only 2 fragments * left in the current fragment range, 3 would be returned so that it could * be passed into the next call to this same function. */ static int unpack_vlcs(Vp3DecodeContext *s, GetBitContext *gb, VLC *table, int coeff_index, int first_fragment, int last_fragment, int eob_run) { int i; int token; int zero_run; DCTELEM coeff; Vp3Fragment *fragment; if ((first_fragment >= s->fragment_count) || (last_fragment >= s->fragment_count)) { printf (" vp3:unpack_vlcs(): bad fragment number (%d -> %d ?)\n", first_fragment, last_fragment); return 0; } for (i = first_fragment; i <= last_fragment; i++) { fragment = &s->all_fragments[s->coded_fragment_list[i]]; if (fragment->coeff_count > coeff_index) continue; if (!eob_run) { /* decode a VLC into a token */ token = get_vlc2(gb, table->table, 5, 3); debug_vlc(" token = %2d, ", token); /* use the token to get a zero run, a coefficient, and an eob run */ unpack_token(gb, token, &zero_run, &coeff, &eob_run); } if (!eob_run) { fragment->coeff_count += zero_run; if (fragment->coeff_count < 64) fragment->coeffs[fragment->coeff_count++] = coeff; debug_vlc(" fragment %d coeff = %d\n", s->coded_fragment_list[i], fragment->coeffs[coeff_index]); } else { fragment->last_coeff = fragment->coeff_count; fragment->coeff_count = 64; debug_vlc(" fragment %d eob with %d coefficients\n", s->coded_fragment_list[i], fragment->last_coeff); eob_run--; } } return eob_run; } /* * This function unpacks all of the DCT coefficient data from the * bitstream. */ static int unpack_dct_coeffs(Vp3DecodeContext *s, GetBitContext *gb) { int i; int dc_y_table; int dc_c_table; int ac_y_table; int ac_c_table; int residual_eob_run = 0; /* fetch the DC table indices */ dc_y_table = get_bits(gb, 4); dc_c_table = get_bits(gb, 4); /* unpack the Y plane DC coefficients */ debug_vp3(" vp3: unpacking Y plane DC coefficients using table %d\n", dc_y_table); residual_eob_run = unpack_vlcs(s, gb, &s->dc_vlc[dc_y_table], 0, s->first_coded_y_fragment, s->last_coded_y_fragment, residual_eob_run); /* unpack the C plane DC coefficients */ debug_vp3(" vp3: unpacking C plane DC coefficients using table %d\n", dc_c_table); residual_eob_run = unpack_vlcs(s, gb, &s->dc_vlc[dc_c_table], 0, s->first_coded_c_fragment, s->last_coded_c_fragment, residual_eob_run); /* fetch the AC table indices */ ac_y_table = get_bits(gb, 4); ac_c_table = get_bits(gb, 4); /* unpack the group 1 AC coefficients (coeffs 1-5) */ for (i = 1; i <= 5; i++) { debug_vp3(" vp3: unpacking level %d Y plane AC coefficients using table %d\n", i, ac_y_table); residual_eob_run = unpack_vlcs(s, gb, &s->ac_vlc_1[ac_y_table], i, s->first_coded_y_fragment, s->last_coded_y_fragment, residual_eob_run); debug_vp3(" vp3: unpacking level %d C plane AC coefficients using table %d\n", i, ac_c_table); residual_eob_run = unpack_vlcs(s, gb, &s->ac_vlc_1[ac_c_table], i, s->first_coded_c_fragment, s->last_coded_c_fragment, residual_eob_run); } /* unpack the group 2 AC coefficients (coeffs 6-14) */ for (i = 6; i <= 14; i++) { debug_vp3(" vp3: unpacking level %d Y plane AC coefficients using table %d\n", i, ac_y_table); residual_eob_run = unpack_vlcs(s, gb, &s->ac_vlc_2[ac_y_table], i, s->first_coded_y_fragment, s->last_coded_y_fragment, residual_eob_run); debug_vp3(" vp3: unpacking level %d C plane AC coefficients using table %d\n", i, ac_c_table); residual_eob_run = unpack_vlcs(s, gb, &s->ac_vlc_2[ac_c_table], i, s->first_coded_c_fragment, s->last_coded_c_fragment, residual_eob_run); } /* unpack the group 3 AC coefficients (coeffs 15-27) */ for (i = 15; i <= 27; i++) { debug_vp3(" vp3: unpacking level %d Y plane AC coefficients using table %d\n", i, ac_y_table); residual_eob_run = unpack_vlcs(s, gb, &s->ac_vlc_3[ac_y_table], i, s->first_coded_y_fragment, s->last_coded_y_fragment, residual_eob_run); debug_vp3(" vp3: unpacking level %d C plane AC coefficients using table %d\n", i, ac_c_table); residual_eob_run = unpack_vlcs(s, gb, &s->ac_vlc_3[ac_c_table], i, s->first_coded_c_fragment, s->last_coded_c_fragment, residual_eob_run); } /* unpack the group 4 AC coefficients (coeffs 28-63) */ for (i = 28; i <= 63; i++) { debug_vp3(" vp3: unpacking level %d Y plane AC coefficients using table %d\n", i, ac_y_table); residual_eob_run = unpack_vlcs(s, gb, &s->ac_vlc_4[ac_y_table], i, s->first_coded_y_fragment, s->last_coded_y_fragment, residual_eob_run); debug_vp3(" vp3: unpacking level %d C plane AC coefficients using table %d\n", i, ac_c_table); residual_eob_run = unpack_vlcs(s, gb, &s->ac_vlc_4[ac_c_table], i, s->first_coded_c_fragment, s->last_coded_c_fragment, residual_eob_run); } return 0; } /* * This function reverses the DC prediction for each coded fragment in * the frame. Much of this function is adapted directly from the original * VP3 source code. */ #define COMPATIBLE_FRAME(x) \ (compatible_frame[s->all_fragments[x].coding_method] == current_frame_type) #define FRAME_CODED(x) (s->all_fragments[x].coding_method != MODE_COPY) static inline int iabs (int x) { return ((x < 0) ? -x : x); } static void reverse_dc_prediction(Vp3DecodeContext *s, int first_fragment, int fragment_width, int fragment_height) { #define PUL 8 #define PU 4 #define PUR 2 #define PL 1 int x, y; int i = first_fragment; /* * Fragment prediction groups: * * 32222222226 * 10000000004 * 10000000004 * 10000000004 * 10000000004 * * Note: Groups 5 and 7 do not exist as it would mean that the * fragment's x coordinate is both 0 and (width - 1) at the same time. */ int predictor_group; short predicted_dc; /* validity flags for the left, up-left, up, and up-right fragments */ int fl, ful, fu, fur; /* DC values for the left, up-left, up, and up-right fragments */ int vl, vul, vu, vur; /* indices for the left, up-left, up, and up-right fragments */ int l, ul, u, ur; /* * The 6 fields mean: * 0: up-left multiplier * 1: up multiplier * 2: up-right multiplier * 3: left multiplier * 4: mask * 5: right bit shift divisor (e.g., 7 means >>=7, a.k.a. div by 128) */ int predictor_transform[16][6] = { { 0, 0, 0, 0, 0, 0 }, { 0, 0, 0, 1, 0, 0 }, // PL { 0, 0, 1, 0, 0, 0 }, // PUR { 0, 0, 53, 75, 127, 7 }, // PUR|PL { 0, 1, 0, 0, 0, 0 }, // PU { 0, 1, 0, 1, 1, 1 }, // PU|PL { 0, 1, 0, 0, 0, 0 }, // PU|PUR { 0, 0, 53, 75, 127, 7 }, // PU|PUR|PL { 1, 0, 0, 0, 0, 0 }, // PUL { 0, 0, 0, 1, 0, 0 }, // PUL|PL { 1, 0, 1, 0, 1, 1 }, // PUL|PUR { 0, 0, 53, 75, 127, 7 }, // PUL|PUR|PL { 0, 1, 0, 0, 0, 0 }, // PUL|PU {-26, 29, 0, 29, 31, 5 }, // PUL|PU|PL { 3, 10, 3, 0, 15, 4 }, // PUL|PU|PUR {-26, 29, 0, 29, 31, 5 } // PUL|PU|PUR|PL }; /* This table shows which types of blocks can use other blocks for * prediction. For example, INTRA is the only mode in this table to * have a frame number of 0. That means INTRA blocks can only predict * from other INTRA blocks. There are 2 golden frame coding types; * blocks encoding in these modes can only predict from other blocks * that were encoded with these 1 of these 2 modes. */ unsigned char compatible_frame[8] = { 1, /* MODE_INTER_NO_MV */ 0, /* MODE_INTRA */ 1, /* MODE_INTER_PLUS_MV */ 1, /* MODE_INTER_LAST_MV */ 1, /* MODE_INTER_PRIOR_MV */ 2, /* MODE_USING_GOLDEN */ 2, /* MODE_GOLDEN_MV */ 1 /* MODE_INTER_FOUR_MV */ }; int current_frame_type; /* there is a last DC predictor for each of the 3 frame types */ short last_dc[3]; int transform = 0; debug_vp3(" vp3: reversing DC prediction\n"); vul = vu = vur = vl = 0; last_dc[0] = last_dc[1] = last_dc[2] = 0; /* for each fragment row... */ for (y = 0; y < fragment_height; y++) { /* for each fragment in a row... */ for (x = 0; x < fragment_width; x++, i++) { /* reverse prediction if this block was coded */ if (s->all_fragments[i].coding_method != MODE_COPY) { current_frame_type = compatible_frame[s->all_fragments[i].coding_method]; predictor_group = (x == 0) + ((y == 0) << 1) + ((x + 1 == fragment_width) << 2); debug_dc_pred(" frag %d: group %d, orig DC = %d, ", i, predictor_group, s->all_fragments[i].coeffs[0]); switch (predictor_group) { case 0: /* main body of fragments; consider all 4 possible * fragments for prediction */ /* calculate the indices of the predicting fragments */ ul = i - fragment_width - 1; u = i - fragment_width; ur = i - fragment_width + 1; l = i - 1; /* fetch the DC values for the predicting fragments */ vul = s->all_fragments[ul].coeffs[0]; vu = s->all_fragments[u].coeffs[0]; vur = s->all_fragments[ur].coeffs[0]; vl = s->all_fragments[l].coeffs[0]; /* figure out which fragments are valid */ ful = FRAME_CODED(ul) && COMPATIBLE_FRAME(ul); fu = FRAME_CODED(u) && COMPATIBLE_FRAME(u); fur = FRAME_CODED(ur) && COMPATIBLE_FRAME(ur); fl = FRAME_CODED(l) && COMPATIBLE_FRAME(l); /* decide which predictor transform to use */ transform = (fl*PL) | (fu*PU) | (ful*PUL) | (fur*PUR); break; case 1: /* left column of fragments, not including top corner; * only consider up and up-right fragments */ /* calculate the indices of the predicting fragments */ u = i - fragment_width; ur = i - fragment_width + 1; /* fetch the DC values for the predicting fragments */ vu = s->all_fragments[u].coeffs[0]; vur = s->all_fragments[ur].coeffs[0]; /* figure out which fragments are valid */ fur = FRAME_CODED(ur) && COMPATIBLE_FRAME(ur); fu = FRAME_CODED(u) && COMPATIBLE_FRAME(u); /* decide which predictor transform to use */ transform = (fu*PU) | (fur*PUR); break; case 2: case 6: /* top row of fragments, not including top-left frag; * only consider the left fragment for prediction */ /* calculate the indices of the predicting fragments */ l = i - 1; /* fetch the DC values for the predicting fragments */ vl = s->all_fragments[l].coeffs[0]; /* figure out which fragments are valid */ fl = FRAME_CODED(l) && COMPATIBLE_FRAME(l); /* decide which predictor transform to use */ transform = (fl*PL); break; case 3: /* top-left fragment */ /* nothing to predict from in this case */ transform = 0; break; case 4: /* right column of fragments, not including top corner; * consider up-left, up, and left fragments for * prediction */ /* calculate the indices of the predicting fragments */ ul = i - fragment_width - 1; u = i - fragment_width; l = i - 1; /* fetch the DC values for the predicting fragments */ vul = s->all_fragments[ul].coeffs[0]; vu = s->all_fragments[u].coeffs[0]; vl = s->all_fragments[l].coeffs[0]; /* figure out which fragments are valid */ ful = FRAME_CODED(ul) && COMPATIBLE_FRAME(ul); fu = FRAME_CODED(u) && COMPATIBLE_FRAME(u); fl = FRAME_CODED(l) && COMPATIBLE_FRAME(l); /* decide which predictor transform to use */ transform = (fl*PL) | (fu*PU) | (ful*PUL); break; } debug_dc_pred("transform = %d, ", transform); if (transform == 0) { /* if there were no fragments to predict from, use last * DC saved */ s->all_fragments[i].coeffs[0] += last_dc[current_frame_type]; debug_dc_pred("from last DC (%d) = %d\n", current_frame_type, s->all_fragments[i].coeffs[0]); } else { /* apply the appropriate predictor transform */ predicted_dc = (predictor_transform[transform][0] * vul) + (predictor_transform[transform][1] * vu) + (predictor_transform[transform][2] * vur) + (predictor_transform[transform][3] * vl); /* if there is a shift value in the transform, add * the sign bit before the shift */ if (predictor_transform[transform][5] != 0) { predicted_dc += ((predicted_dc >> 15) & predictor_transform[transform][4]); predicted_dc >>= predictor_transform[transform][5]; } /* check for outranging on the [ul u l] and * [ul u ur l] predictors */ if ((transform == 13) || (transform == 15)) { if (iabs(predicted_dc - vu) > 128) predicted_dc = vu; else if (iabs(predicted_dc - vl) > 128) predicted_dc = vl; else if (iabs(predicted_dc - vul) > 128) predicted_dc = vul; } /* at long last, apply the predictor */ s->all_fragments[i].coeffs[0] += predicted_dc; debug_dc_pred("from pred DC = %d\n", s->all_fragments[i].coeffs[0]); } /* save the DC */ last_dc[current_frame_type] = s->all_fragments[i].coeffs[0]; } } } } /* * This function performs the final rendering of each fragment's data * onto the output frame. */ static void render_fragments(Vp3DecodeContext *s, int first_fragment, int width, int height, int plane /* 0 = Y, 1 = U, 2 = V */) { int x, y; int m, n; int i = first_fragment; int j; int16_t *dequantizer; DCTELEM dequant_block[64]; DCTELEM dequant_block_permuted[64]; unsigned char *output_plane; unsigned char *last_plane; unsigned char *golden_plane; int stride; int motion_x, motion_y; int upper_motion_limit, lower_motion_limit; int motion_halfpel_index; unsigned int motion_source; debug_vp3(" vp3: rendering final fragments for %s\n", (plane == 0) ? "Y plane" : (plane == 1) ? "U plane" : "V plane"); /* set up plane-specific parameters */ if (plane == 0) { dequantizer = s->intra_y_dequant; output_plane = s->current_frame.data[0]; last_plane = s->last_frame.data[0]; golden_plane = s->golden_frame.data[0]; stride = -s->current_frame.linesize[0]; upper_motion_limit = 7 * s->current_frame.linesize[0]; lower_motion_limit = height * s->current_frame.linesize[0] + width - 8; } else if (plane == 1) { dequantizer = s->intra_c_dequant; output_plane = s->current_frame.data[1]; last_plane = s->last_frame.data[1]; golden_plane = s->golden_frame.data[1]; stride = -s->current_frame.linesize[1]; upper_motion_limit = 7 * s->current_frame.linesize[1]; lower_motion_limit = height * s->current_frame.linesize[1] + width - 8; } else { dequantizer = s->intra_c_dequant; output_plane = s->current_frame.data[2]; last_plane = s->last_frame.data[2]; golden_plane = s->golden_frame.data[2]; stride = -s->current_frame.linesize[2]; upper_motion_limit = 7 * s->current_frame.linesize[2]; lower_motion_limit = height * s->current_frame.linesize[2] + width - 8; } /* for each fragment row... */ for (y = 0; y < height; y += 8) { /* for each fragment in a row... */ for (x = 0; x < width; x += 8, i++) { if ((i < 0) || (i >= s->fragment_count)) { printf (" vp3:render_fragments(): bad fragment number (%d)\n", i); return; } /* transform if this block was coded */ if (s->all_fragments[i].coding_method != MODE_COPY) { /* sort out the motion vector */ motion_x = s->all_fragments[i].motion_x; motion_y = s->all_fragments[i].motion_y; motion_halfpel_index = s->all_fragments[i].motion_halfpel_index; motion_source = s->all_fragments[i].first_pixel; motion_source += motion_x; motion_source += (motion_y * stride); /* if the are any problems with a motion vector, refuse * to render the block */ if ((motion_source < upper_motion_limit) || (motion_source > lower_motion_limit)) { // printf (" vp3: help! motion source (%d) out of range (%d..%d)\n", // motion_source, upper_motion_limit, lower_motion_limit); continue; } /* first, take care of copying a block from either the * previous or the golden frame */ if ((s->all_fragments[i].coding_method == MODE_USING_GOLDEN) || (s->all_fragments[i].coding_method == MODE_GOLDEN_MV)) { s->dsp.put_pixels_tab[1][motion_halfpel_index]( output_plane + s->all_fragments[i].first_pixel, golden_plane + motion_source, stride, 8); } else if (s->all_fragments[i].coding_method != MODE_INTRA) { s->dsp.put_pixels_tab[1][motion_halfpel_index]( output_plane + s->all_fragments[i].first_pixel, last_plane + motion_source, stride, 8); } /* dequantize the DCT coefficients */ debug_idct("fragment %d, coding mode %d, DC = %d, dequant = %d:\n", i, s->all_fragments[i].coding_method, s->all_fragments[i].coeffs[0], dequantizer[0]); for (j = 0; j < 64; j++) dequant_block[dezigzag_index[j]] = s->all_fragments[i].coeffs[j] * dequantizer[j]; for (j = 0; j < 64; j++) dequant_block_permuted[s->dsp.idct_permutation[j]] = dequant_block[j]; debug_idct("dequantized block:\n"); for (m = 0; m < 8; m++) { for (n = 0; n < 8; n++) { debug_idct(" %5d", dequant_block[m * 8 + n]); } debug_idct("\n"); } debug_idct("\n"); /* invert DCT and place (or add) in final output */ if (s->all_fragments[i].coding_method == MODE_INTRA) { dequant_block_permuted[0] += 1024; s->dsp.idct_put( output_plane + s->all_fragments[i].first_pixel, stride, dequant_block_permuted); } else { s->dsp.idct_add( output_plane + s->all_fragments[i].first_pixel, stride, dequant_block_permuted); } debug_idct("block after idct_%s():\n", (s->all_fragments[i].coding_method == MODE_INTRA)? "put" : "add"); for (m = 0; m < 8; m++) { for (n = 0; n < 8; n++) { debug_idct(" %3d", *(output_plane + s->all_fragments[i].first_pixel + (m * stride + n))); } debug_idct("\n"); } debug_idct("\n"); } else { /* copy directly from the previous frame */ s->dsp.put_pixels_tab[1][0]( output_plane + s->all_fragments[i].first_pixel, last_plane + s->all_fragments[i].first_pixel, stride, 8); } } } emms_c(); } /* * This function computes the first pixel addresses for each fragment. * This function needs to be invoked after the first frame is allocated * so that it has access to the plane strides. */ static void vp3_calculate_pixel_addresses(Vp3DecodeContext *s) { int i, x, y; /* figure out the first pixel addresses for each of the fragments */ /* Y plane */ i = 0; for (y = s->fragment_height; y > 0; y--) { for (x = 0; x < s->fragment_width; x++) { s->all_fragments[i++].first_pixel = s->golden_frame.linesize[0] * y * FRAGMENT_PIXELS - s->golden_frame.linesize[0] + x * FRAGMENT_PIXELS; debug_init(" fragment %d, first pixel @ %d\n", i-1, s->all_fragments[i-1].first_pixel); } } /* U plane */ i = s->u_fragment_start; for (y = s->fragment_height / 2; y > 0; y--) { for (x = 0; x < s->fragment_width / 2; x++) { s->all_fragments[i++].first_pixel = s->golden_frame.linesize[1] * y * FRAGMENT_PIXELS - s->golden_frame.linesize[1] + x * FRAGMENT_PIXELS; debug_init(" fragment %d, first pixel @ %d\n", i-1, s->all_fragments[i-1].first_pixel); } } /* V plane */ i = s->v_fragment_start; for (y = s->fragment_height / 2; y > 0; y--) { for (x = 0; x < s->fragment_width / 2; x++) { s->all_fragments[i++].first_pixel = s->golden_frame.linesize[2] * y * FRAGMENT_PIXELS - s->golden_frame.linesize[2] + x * FRAGMENT_PIXELS; debug_init(" fragment %d, first pixel @ %d\n", i-1, s->all_fragments[i-1].first_pixel); } } } /* * This is the ffmpeg/libavcodec API init function. */ static int vp3_decode_init(AVCodecContext *avctx) { Vp3DecodeContext *s = avctx->priv_data; int i; int c_width; int c_height; int y_superblock_count; int c_superblock_count; s->avctx = avctx; s->width = avctx->width; s->height = avctx->height; avctx->pix_fmt = PIX_FMT_YUV420P; avctx->has_b_frames = 0; dsputil_init(&s->dsp, avctx); /* initialize to an impossible value which will force a recalculation * in the first frame decode */ s->quality_index = -1; s->y_superblock_width = (s->width + 31) / 32; s->y_superblock_height = (s->height + 31) / 32; y_superblock_count = s->y_superblock_width * s->y_superblock_height; /* work out the dimensions for the C planes */ c_width = s->width / 2; c_height = s->height / 2; s->c_superblock_width = (c_width + 31) / 32; s->c_superblock_height = (c_height + 31) / 32; c_superblock_count = s->c_superblock_width * s->c_superblock_height; s->superblock_count = y_superblock_count + (c_superblock_count * 2); s->u_superblock_start = y_superblock_count; s->v_superblock_start = s->u_superblock_start + c_superblock_count; s->superblock_coding = av_malloc(s->superblock_count); s->macroblock_width = (s->width + 15) / 16; s->macroblock_height = (s->height + 15) / 16; s->macroblock_count = s->macroblock_width * s->macroblock_height; s->fragment_width = s->width / FRAGMENT_PIXELS; s->fragment_height = s->height / FRAGMENT_PIXELS; /* fragment count covers all 8x8 blocks for all 3 planes */ s->fragment_count = s->fragment_width * s->fragment_height * 3 / 2; s->u_fragment_start = s->fragment_width * s->fragment_height; s->v_fragment_start = s->fragment_width * s->fragment_height * 5 / 4; debug_init(" Y plane: %d x %d\n", s->width, s->height); debug_init(" C plane: %d x %d\n", c_width, c_height); debug_init(" Y superblocks: %d x %d, %d total\n", s->y_superblock_width, s->y_superblock_height, y_superblock_count); debug_init(" C superblocks: %d x %d, %d total\n", s->c_superblock_width, s->c_superblock_height, c_superblock_count); debug_init(" total superblocks = %d, U starts @ %d, V starts @ %d\n", s->superblock_count, s->u_superblock_start, s->v_superblock_start); debug_init(" macroblocks: %d x %d, %d total\n", s->macroblock_width, s->macroblock_height, s->macroblock_count); debug_init(" %d fragments, %d x %d, u starts @ %d, v starts @ %d\n", s->fragment_count, s->fragment_width, s->fragment_height, s->u_fragment_start, s->v_fragment_start); s->all_fragments = av_malloc(s->fragment_count * sizeof(Vp3Fragment)); s->coded_fragment_list = av_malloc(s->fragment_count * sizeof(int)); s->pixel_addresses_inited = 0; /* init VLC tables */ for (i = 0; i < 16; i++) { /* DC histograms */ init_vlc(&s->dc_vlc[i], 5, 32, &dc_bias[i][0][1], 4, 2, &dc_bias[i][0][0], 4, 2); /* group 1 AC histograms */ init_vlc(&s->ac_vlc_1[i], 5, 32, &ac_bias_0[i][0][1], 4, 2, &ac_bias_0[i][0][0], 4, 2); /* group 2 AC histograms */ init_vlc(&s->ac_vlc_2[i], 5, 32, &ac_bias_1[i][0][1], 4, 2, &ac_bias_1[i][0][0], 4, 2); /* group 3 AC histograms */ init_vlc(&s->ac_vlc_3[i], 5, 32, &ac_bias_2[i][0][1], 4, 2, &ac_bias_2[i][0][0], 4, 2); /* group 4 AC histograms */ init_vlc(&s->ac_vlc_4[i], 5, 32, &ac_bias_3[i][0][1], 4, 2, &ac_bias_3[i][0][0], 4, 2); } /* build quantization zigzag table */ for (i = 0; i < 64; i++) zigzag_index[dezigzag_index[i]] = i; /* work out the block mapping tables */ s->superblock_fragments = av_malloc(s->superblock_count * 16 * sizeof(int)); s->superblock_macroblocks = av_malloc(s->superblock_count * 4 * sizeof(int)); s->macroblock_fragments = av_malloc(s->macroblock_count * 6 * sizeof(int)); s->macroblock_coding = av_malloc(s->macroblock_count + 1); init_block_mapping(s); for (i = 0; i < 3; i++) { s->current_frame.data[i] = NULL; s->last_frame.data[i] = NULL; s->golden_frame.data[i] = NULL; } return 0; } /* * This is the ffmpeg/libavcodec API frame decode function. */ static int vp3_decode_frame(AVCodecContext *avctx, void *data, int *data_size, uint8_t *buf, int buf_size) { Vp3DecodeContext *s = avctx->priv_data; GetBitContext gb; static int counter = 0; *data_size = 0; init_get_bits(&gb, buf, buf_size * 8); s->keyframe = get_bits(&gb, 1); s->keyframe ^= 1; skip_bits(&gb, 1); s->last_quality_index = s->quality_index; s->quality_index = get_bits(&gb, 6); if (s->quality_index != s->last_quality_index) init_dequantizer(s); debug_vp3(" VP3 frame #%d: Q index = %d", counter, s->quality_index); counter++; if (s->keyframe) { debug_vp3(", keyframe\n"); /* skip the other 2 header bytes for now */ skip_bits(&gb, 16); if (s->last_frame.data[0] == s->golden_frame.data[0]) { if (s->golden_frame.data[0]) avctx->release_buffer(avctx, &s->golden_frame); } else { if (s->golden_frame.data[0]) avctx->release_buffer(avctx, &s->golden_frame); if (s->last_frame.data[0]) avctx->release_buffer(avctx, &s->last_frame); } s->golden_frame.reference = 0; if(avctx->get_buffer(avctx, &s->golden_frame) < 0) { printf("vp3: get_buffer() failed\n"); return -1; } /* golden frame is also the current frame */ memcpy(&s->current_frame, &s->golden_frame, sizeof(AVFrame)); /* time to figure out pixel addresses? */ if (!s->pixel_addresses_inited) vp3_calculate_pixel_addresses(s); } else { debug_vp3("\n"); /* allocate a new current frame */ s->current_frame.reference = 0; if(avctx->get_buffer(avctx, &s->current_frame) < 0) { printf("vp3: get_buffer() failed\n"); return -1; } } init_frame(s, &gb); #if KEYFRAMES_ONLY if (!s->keyframe) { memcpy(s->current_frame.data[0], s->golden_frame.data[0], s->current_frame.linesize[0] * s->height); memcpy(s->current_frame.data[1], s->golden_frame.data[1], s->current_frame.linesize[1] * s->height / 2); memcpy(s->current_frame.data[2], s->golden_frame.data[2], s->current_frame.linesize[2] * s->height / 2); } else { #endif if (unpack_superblocks(s, &gb) || unpack_modes(s, &gb) || unpack_vectors(s, &gb) || unpack_dct_coeffs(s, &gb)) { printf(" vp3: could not decode frame\n"); return -1; } reverse_dc_prediction(s, 0, s->fragment_width, s->fragment_height); reverse_dc_prediction(s, s->u_fragment_start, s->fragment_width / 2, s->fragment_height / 2); reverse_dc_prediction(s, s->v_fragment_start, s->fragment_width / 2, s->fragment_height / 2); render_fragments(s, 0, s->width, s->height, 0); render_fragments(s, s->u_fragment_start, s->width / 2, s->height / 2, 1); render_fragments(s, s->v_fragment_start, s->width / 2, s->height / 2, 2); #if KEYFRAMES_ONLY } #endif *data_size=sizeof(AVFrame); *(AVFrame*)data= s->current_frame; /* release the last frame, if it is allocated and if it is not the * golden frame */ if ((s->last_frame.data[0]) && (s->last_frame.data[0] != s->golden_frame.data[0])) avctx->release_buffer(avctx, &s->last_frame); /* shuffle frames (last = current) */ memcpy(&s->last_frame, &s->current_frame, sizeof(AVFrame)); return buf_size; } /* * This is the ffmpeg/libavcodec API module cleanup function. */ static int vp3_decode_end(AVCodecContext *avctx) { Vp3DecodeContext *s = avctx->priv_data; av_free(s->all_fragments); av_free(s->coded_fragment_list); av_free(s->superblock_fragments); av_free(s->superblock_macroblocks); av_free(s->macroblock_fragments); av_free(s->macroblock_coding); /* release all frames */ if (s->golden_frame.data[0]) avctx->release_buffer(avctx, &s->golden_frame); if (s->last_frame.data[0]) avctx->release_buffer(avctx, &s->last_frame); /* no need to release the current_frame since it will always be pointing * to the same frame as either the golden or last frame */ return 0; } AVCodec vp3_decoder = { "vp3", CODEC_TYPE_VIDEO, CODEC_ID_VP3, sizeof(Vp3DecodeContext), vp3_decode_init, NULL, vp3_decode_end, vp3_decode_frame, 0, NULL };