/* * Copyright (C) 2003-2004 the ffmpeg project * * This file is part of FFmpeg. * * FFmpeg 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 2.1 of the License, or (at your option) any later version. * * FFmpeg 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 FFmpeg; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ /** * @file libavcodec/vp3.c * On2 VP3 Video Decoder * * VP3 Video Decoder by Mike Melanson (mike at multimedia.cx) * For more information about the VP3 coding process, visit: * http://wiki.multimedia.cx/index.php?title=On2_VP3 * * Theora decoder by Alex Beregszaszi */ #include #include #include #include "avcodec.h" #include "dsputil.h" #include "get_bits.h" #include "vp3data.h" #include "xiph.h" #define FRAGMENT_PIXELS 8 static av_cold int vp3_decode_end(AVCodecContext *avctx); //FIXME split things out into their own arrays typedef struct Vp3Fragment { int16_t dc; uint8_t coding_method; int8_t motion_x; int8_t motion_y; uint8_t qpi; } Vp3Fragment; #define SB_NOT_CODED 0 #define SB_PARTIALLY_CODED 1 #define SB_FULLY_CODED 2 // This is the maximum length of a single long bit run that can be encoded // for superblock coding or block qps. Theora special-cases this to read a // bit instead of flipping the current bit to allow for runs longer than 4129. #define MAXIMUM_LONG_BIT_RUN 4129 #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 const int ModeAlphabet[6][CODING_MODE_COUNT] = { /* 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 }, }; static const uint8_t hilbert_offset[16][2] = { {0,0}, {1,0}, {1,1}, {0,1}, {0,2}, {0,3}, {1,3}, {1,2}, {2,2}, {2,3}, {3,3}, {3,2}, {3,1}, {2,1}, {2,0}, {3,0} }; #define MIN_DEQUANT_VAL 2 typedef struct Vp3DecodeContext { AVCodecContext *avctx; int theora, theora_tables; int version; int width, height; AVFrame golden_frame; AVFrame last_frame; AVFrame current_frame; int keyframe; DSPContext dsp; int flipped_image; int last_slice_end; int qps[3]; int nqps; int last_qps[3]; int superblock_count; int y_superblock_width; int y_superblock_height; int y_superblock_count; int c_superblock_width; int c_superblock_height; int c_superblock_count; 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 fragment_start[3]; int data_offset[3]; ScanTable scantable; /* tables */ uint16_t coded_dc_scale_factor[64]; uint32_t coded_ac_scale_factor[64]; uint8_t base_matrix[384][64]; uint8_t qr_count[2][3]; uint8_t qr_size [2][3][64]; uint16_t qr_base[2][3][64]; /** * This is a list of all tokens in bitstream order. Reordering takes place * by pulling from each level during IDCT. As a consequence, IDCT must be * in Hilbert order, making the minimum slice height 64 for 4:2:0 and 32 * otherwise. The 32 different tokens with up to 12 bits of extradata are * collapsed into 3 types, packed as follows: * (from the low to high bits) * * 2 bits: type (0,1,2) * 0: EOB run, 14 bits for run length (12 needed) * 1: zero run, 7 bits for run length * 7 bits for the next coefficient (3 needed) * 2: coefficient, 14 bits (11 needed) * * Coefficients are signed, so are packed in the highest bits for automatic * sign extension. */ int16_t *dct_tokens[3][64]; int16_t *dct_tokens_base; #define TOKEN_EOB(eob_run) ((eob_run) << 2) #define TOKEN_ZERO_RUN(coeff, zero_run) (((coeff) << 9) + ((zero_run) << 2) + 1) #define TOKEN_COEFF(coeff) (((coeff) << 2) + 2) /** * number of blocks that contain DCT coefficients at the given level or higher */ int num_coded_frags[3][64]; int total_num_coded_frags; /* this is a list of indexes into the all_fragments array indicating * which of the fragments are coded */ int *coded_fragment_list[3]; VLC dc_vlc[16]; VLC ac_vlc_1[16]; VLC ac_vlc_2[16]; VLC ac_vlc_3[16]; VLC ac_vlc_4[16]; VLC superblock_run_length_vlc; VLC fragment_run_length_vlc; VLC mode_code_vlc; VLC motion_vector_vlc; /* these arrays need to be on 16-byte boundaries since SSE2 operations * index into them */ DECLARE_ALIGNED_16(int16_t, qmat)[3][2][3][64]; // 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_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 mapping_index = 0; static const signed char travel_width[16] = { 1, 1, 0, -1, 0, 0, 1, 0, 1, 0, 1, 0, 0, -1, 0, 1 }; static const signed char travel_height[16] = { 0, 0, 1, 0, 1, 1, 0, -1, 0, 1, 0, -1, -1, 0, -1, 0 }; 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++) { /* 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); /* 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); /* the first operation for this variable is to advance by 1 */ current_fragment = s->fragment_start[1] - 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); /* the first operation for this variable is to advance by 1 */ current_fragment = s->fragment_start[2] - 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 += travel_width[j] + right_edge * travel_height[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; } else { s->superblock_fragments[mapping_index] = -1; } mapping_index++; } } return 0; /* successful path out */ } /* * 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 */ for (i = 0; i < s->fragment_count; i++) { s->all_fragments[i].motion_x = 127; s->all_fragments[i].motion_y = 127; s->all_fragments[i].dc = 0; s->all_fragments[i].qpi = 0; } } /* * This function sets up the dequantization tables used for a particular * frame. */ static void init_dequantizer(Vp3DecodeContext *s, int qpi) { int ac_scale_factor = s->coded_ac_scale_factor[s->qps[qpi]]; int dc_scale_factor = s->coded_dc_scale_factor[s->qps[qpi]]; int i, plane, inter, qri, bmi, bmj, qistart; for(inter=0; inter<2; inter++){ for(plane=0; plane<3; plane++){ int sum=0; for(qri=0; qriqr_count[inter][plane]; qri++){ sum+= s->qr_size[inter][plane][qri]; if(s->qps[qpi] <= sum) break; } qistart= sum - s->qr_size[inter][plane][qri]; bmi= s->qr_base[inter][plane][qri ]; bmj= s->qr_base[inter][plane][qri+1]; for(i=0; i<64; i++){ int coeff= ( 2*(sum -s->qps[qpi])*s->base_matrix[bmi][i] - 2*(qistart-s->qps[qpi])*s->base_matrix[bmj][i] + s->qr_size[inter][plane][qri]) / (2*s->qr_size[inter][plane][qri]); int qmin= 8<<(inter + !i); int qscale= i ? ac_scale_factor : dc_scale_factor; s->qmat[qpi][inter][plane][s->dsp.idct_permutation[i]]= av_clip((qscale * coeff)/100 * 4, qmin, 4096); } // all DC coefficients use the same quant so as not to interfere with DC prediction s->qmat[qpi][inter][plane][0] = s->qmat[0][inter][plane][0]; } } memset(s->qscale_table, (FFMAX(s->qmat[0][0][0][1], s->qmat[0][0][1][1])+8)/16, 512); //FIXME finetune } /* * This function initializes the loop filter boundary limits if the frame's * quality index is different from the previous frame's. * * The filter_limit_values may not be larger than 127. */ static void init_loop_filter(Vp3DecodeContext *s) { int *bounding_values= s->bounding_values_array+127; int filter_limit; int x; int value; filter_limit = s->filter_limit_values[s->qps[0]]; /* set up the bounding values */ memset(s->bounding_values_array, 0, 256 * sizeof(int)); for (x = 0; x < filter_limit; x++) { bounding_values[-x] = -x; bounding_values[x] = x; } for (x = value = filter_limit; x < 128 && value; x++, value--) { bounding_values[ x] = value; bounding_values[-x] = -value; } if (value) bounding_values[128] = value; bounding_values[129] = bounding_values[130] = filter_limit * 0x02020202; } /* * 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 num_partial_superblocks = 0; int i, j; int current_fragment; int plane; if (s->keyframe) { memset(s->superblock_coding, SB_FULLY_CODED, s->superblock_count); } else { /* unpack the list of partially-coded superblocks */ bit = get_bits1(gb); while (current_superblock < s->superblock_count) { current_run = get_vlc2(gb, s->superblock_run_length_vlc.table, 6, 2) + 1; if (current_run == 34) current_run += get_bits(gb, 12); if (current_superblock + current_run > s->superblock_count) { av_log(s->avctx, AV_LOG_ERROR, "Invalid partially coded superblock run length\n"); return -1; } memset(s->superblock_coding + current_superblock, bit, current_run); current_superblock += current_run; if (bit) num_partial_superblocks += current_run; if (s->theora && current_run == MAXIMUM_LONG_BIT_RUN) bit = get_bits1(gb); else bit ^= 1; } /* unpack the list of fully coded superblocks if any of the blocks were * not marked as partially coded in the previous step */ if (num_partial_superblocks < s->superblock_count) { int superblocks_decoded = 0; current_superblock = 0; bit = get_bits1(gb); while (superblocks_decoded < s->superblock_count - num_partial_superblocks) { current_run = get_vlc2(gb, s->superblock_run_length_vlc.table, 6, 2) + 1; if (current_run == 34) current_run += get_bits(gb, 12); for (j = 0; j < current_run; current_superblock++) { if (current_superblock >= s->superblock_count) { av_log(s->avctx, AV_LOG_ERROR, "Invalid fully coded superblock run length\n"); return -1; } /* skip any superblocks already marked as partially coded */ if (s->superblock_coding[current_superblock] == SB_NOT_CODED) { s->superblock_coding[current_superblock] = 2*bit; j++; } } superblocks_decoded += current_run; if (s->theora && current_run == MAXIMUM_LONG_BIT_RUN) bit = get_bits1(gb); else bit ^= 1; } } /* if there were partial blocks, initialize bitstream for * unpacking fragment codings */ if (num_partial_superblocks) { current_run = 0; bit = get_bits1(gb); /* 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->total_num_coded_frags = 0; memset(s->macroblock_coding, MODE_COPY, s->macroblock_count); for (plane = 0; plane < 3; plane++) { int sb_start = (int[]){ 0, s->u_superblock_start, s->v_superblock_start }[plane]; int sb_end = sb_start + (plane ? s->c_superblock_count : s->y_superblock_count); int num_coded_frags = 0; for (i = sb_start; i < sb_end; 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) { av_log(s->avctx, AV_LOG_ERROR, " vp3:unpack_superblocks(): bad fragment number (%d >= %d)\n", current_fragment, s->fragment_count); return 1; } if (current_fragment != -1) { int coded = s->superblock_coding[i]; 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_vlc2(gb, s->fragment_run_length_vlc.table, 5, 2); } coded = bit; } if (coded) { /* 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[plane][num_coded_frags++] = current_fragment; } else { /* not coded; copy this fragment from the prior frame */ s->all_fragments[current_fragment].coding_method = MODE_COPY; } } } } s->total_num_coded_frags += num_coded_frags; for (i = 0; i < 64; i++) s->num_coded_frags[plane][i] = num_coded_frags; if (plane < 2) s->coded_fragment_list[plane+1] = s->coded_fragment_list[plane] + num_coded_frags; } 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, sb_x, sb_y; int scheme; int current_macroblock; int current_fragment; int coding_mode; int custom_mode_alphabet[CODING_MODE_COUNT]; const int *alphabet; if (s->keyframe) { 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); /* is it a custom coding scheme? */ if (scheme == 0) { for (i = 0; i < 8; i++) custom_mode_alphabet[i] = MODE_INTER_NO_MV; for (i = 0; i < 8; i++) custom_mode_alphabet[get_bits(gb, 3)] = i; alphabet = custom_mode_alphabet; } else alphabet = ModeAlphabet[scheme-1]; /* iterate through all of the macroblocks that contain 1 or more * coded fragments */ for (sb_y = 0; sb_y < s->y_superblock_height; sb_y++) { for (sb_x = 0; sb_x < s->y_superblock_width; sb_x++) { for (j = 0; j < 4; j++) { int mb_x = 2*sb_x + (j>>1); int mb_y = 2*sb_y + (((j>>1)+j)&1); current_macroblock = mb_y * s->macroblock_width + mb_x; if (mb_x >= s->macroblock_width || mb_y >= s->macroblock_height) continue; #define BLOCK_X (2*mb_x + (k&1)) #define BLOCK_Y (2*mb_y + (k>>1)) /* coding modes are only stored if the macroblock has at least one * luma block coded, otherwise it must be INTER_NO_MV */ for (k = 0; k < 4; k++) { current_fragment = BLOCK_Y*s->fragment_width + BLOCK_X; if (s->all_fragments[current_fragment].coding_method != MODE_COPY) break; } if (k == 4) { s->macroblock_coding[current_macroblock] = MODE_INTER_NO_MV; continue; } /* mode 7 means get 3 bits for each coding mode */ if (scheme == 7) coding_mode = get_bits(gb, 3); else coding_mode = alphabet [get_vlc2(gb, s->mode_code_vlc.table, 3, 3)]; s->macroblock_coding[current_macroblock] = coding_mode; for (k = 0; k < 4; k++) { current_fragment = BLOCK_Y*s->fragment_width + BLOCK_X; if (s->all_fragments[current_fragment].coding_method != MODE_COPY) s->all_fragments[current_fragment].coding_method = coding_mode; } for (k = 0; k < 2; k++) { current_fragment = s->fragment_start[k+1] + mb_y*(s->fragment_width>>1) + mb_x; if (s->all_fragments[current_fragment].coding_method != MODE_COPY) s->all_fragments[current_fragment].coding_method = coding_mode; } } } } } return 0; } /* * This function unpacks all the motion vectors for the individual * macroblocks from the bitstream. */ static int unpack_vectors(Vp3DecodeContext *s, GetBitContext *gb) { int j, k, sb_x, sb_y; 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; if (s->keyframe) return 0; 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_bits1(gb); /* iterate through all of the macroblocks that contain 1 or more * coded fragments */ for (sb_y = 0; sb_y < s->y_superblock_height; sb_y++) { for (sb_x = 0; sb_x < s->y_superblock_width; sb_x++) { for (j = 0; j < 4; j++) { int mb_x = 2*sb_x + (j>>1); int mb_y = 2*sb_y + (((j>>1)+j)&1); current_macroblock = mb_y * s->macroblock_width + mb_x; if (mb_x >= s->macroblock_width || mb_y >= s->macroblock_height || (s->macroblock_coding[current_macroblock] == MODE_COPY)) continue; 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] = motion_vector_table[get_vlc2(gb, s->motion_vector_vlc.table, 6, 2)]; motion_y[0] = motion_vector_table[get_vlc2(gb, s->motion_vector_vlc.table, 6, 2)]; } else { motion_x[0] = fixed_motion_vector_table[get_bits(gb, 6)]; motion_y[0] = fixed_motion_vector_table[get_bits(gb, 6)]; } /* vector maintenance, only on MODE_INTER_PLUS_MV */ if (s->macroblock_coding[current_macroblock] == 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: /* vector maintenance */ prior_last_motion_x = last_motion_x; prior_last_motion_y = last_motion_y; /* 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++) { current_fragment = BLOCK_Y*s->fragment_width + BLOCK_X; if (s->all_fragments[current_fragment].coding_method != MODE_COPY) { if (coding_mode == 0) { motion_x[k] = motion_vector_table[get_vlc2(gb, s->motion_vector_vlc.table, 6, 2)]; motion_y[k] = motion_vector_table[get_vlc2(gb, s->motion_vector_vlc.table, 6, 2)]; } else { motion_x[k] = fixed_motion_vector_table[get_bits(gb, 6)]; motion_y[k] = fixed_motion_vector_table[get_bits(gb, 6)]; } last_motion_x = motion_x[k]; last_motion_y = motion_y[k]; } else { motion_x[k] = 0; motion_y[k] = 0; } motion_x[4] += motion_x[k]; motion_y[4] += motion_y[k]; } motion_x[5]= motion_x[4]= RSHIFT(motion_x[4], 2); motion_y[5]= motion_y[4]= RSHIFT(motion_y[4], 2); 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; /* 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; /* 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 */ motion_x[0] = 0; motion_y[0] = 0; /* no vector maintenance */ break; } /* assign the motion vectors to the correct fragments */ for (k = 0; k < 4; k++) { current_fragment = BLOCK_Y*s->fragment_width + BLOCK_X; if (s->macroblock_coding[current_macroblock] == MODE_INTER_FOURMV) { s->all_fragments[current_fragment].motion_x = motion_x[k]; s->all_fragments[current_fragment].motion_y = motion_y[k]; } else { s->all_fragments[current_fragment].motion_x = motion_x[0]; s->all_fragments[current_fragment].motion_y = motion_y[0]; } } for (k = 0; k < 2; k++) { current_fragment = s->fragment_start[k+1] + mb_y*(s->fragment_width>>1) + mb_x; if (s->macroblock_coding[current_macroblock] == MODE_INTER_FOURMV) { s->all_fragments[current_fragment].motion_x = motion_x[k+4]; s->all_fragments[current_fragment].motion_y = motion_y[k+4]; } else { s->all_fragments[current_fragment].motion_x = motion_x[0]; s->all_fragments[current_fragment].motion_y = motion_y[0]; } } } } } return 0; } static int unpack_block_qpis(Vp3DecodeContext *s, GetBitContext *gb) { int qpi, i, j, bit, run_length, blocks_decoded, num_blocks_at_qpi; int num_blocks = s->total_num_coded_frags; for (qpi = 0; qpi < s->nqps-1 && num_blocks > 0; qpi++) { i = blocks_decoded = num_blocks_at_qpi = 0; bit = get_bits1(gb); do { run_length = get_vlc2(gb, s->superblock_run_length_vlc.table, 6, 2) + 1; if (run_length == 34) run_length += get_bits(gb, 12); blocks_decoded += run_length; if (!bit) num_blocks_at_qpi += run_length; for (j = 0; j < run_length; i++) { if (i >= s->total_num_coded_frags) return -1; if (s->all_fragments[s->coded_fragment_list[0][i]].qpi == qpi) { s->all_fragments[s->coded_fragment_list[0][i]].qpi += bit; j++; } } if (run_length == MAXIMUM_LONG_BIT_RUN) bit = get_bits1(gb); else bit ^= 1; } while (blocks_decoded < num_blocks); num_blocks -= num_blocks_at_qpi; } 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 plane, int eob_run) { int i, j = 0; int token; int zero_run = 0; DCTELEM coeff = 0; int bits_to_get; int blocks_ended; int coeff_i = 0; int num_coeffs = s->num_coded_frags[plane][coeff_index]; int16_t *dct_tokens = s->dct_tokens[plane][coeff_index]; /* local references to structure members to avoid repeated deferences */ int *coded_fragment_list = s->coded_fragment_list[plane]; Vp3Fragment *all_fragments = s->all_fragments; VLC_TYPE (*vlc_table)[2] = table->table; if (num_coeffs < 0) av_log(s->avctx, AV_LOG_ERROR, "Invalid number of coefficents at level %d\n", coeff_index); if (eob_run > num_coeffs) { coeff_i = blocks_ended = num_coeffs; eob_run -= num_coeffs; } else { coeff_i = blocks_ended = eob_run; eob_run = 0; } // insert fake EOB token to cover the split between planes or zzi if (blocks_ended) dct_tokens[j++] = blocks_ended << 2; while (coeff_i < num_coeffs) { /* decode a VLC into a token */ token = get_vlc2(gb, vlc_table, 5, 3); /* use the token to get a zero run, a coefficient, and an eob run */ if (token <= 6) { eob_run = eob_run_base[token]; if (eob_run_get_bits[token]) eob_run += get_bits(gb, eob_run_get_bits[token]); // record only the number of blocks ended in this plane, // any spill will be recorded in the next plane. if (eob_run > num_coeffs - coeff_i) { dct_tokens[j++] = TOKEN_EOB(num_coeffs - coeff_i); blocks_ended += num_coeffs - coeff_i; eob_run -= num_coeffs - coeff_i; coeff_i = num_coeffs; } else { dct_tokens[j++] = TOKEN_EOB(eob_run); blocks_ended += eob_run; coeff_i += eob_run; eob_run = 0; } } else { bits_to_get = coeff_get_bits[token]; if (bits_to_get) bits_to_get = get_bits(gb, bits_to_get); coeff = coeff_tables[token][bits_to_get]; zero_run = zero_run_base[token]; if (zero_run_get_bits[token]) zero_run += get_bits(gb, zero_run_get_bits[token]); if (zero_run) { dct_tokens[j++] = TOKEN_ZERO_RUN(coeff, zero_run); } else { // Save DC into the fragment structure. DC prediction is // done in raster order, so the actual DC can't be in with // other tokens. We still need the token in dct_tokens[] // however, or else the structure collapses on itself. if (!coeff_index) all_fragments[coded_fragment_list[coeff_i]].dc = coeff; dct_tokens[j++] = TOKEN_COEFF(coeff); } if (coeff_index + zero_run > 64) { av_log(s->avctx, AV_LOG_ERROR, "Invalid zero run of %d with" " %d coeffs left\n", zero_run, 64-coeff_index); zero_run = 64 - coeff_index; } // zero runs code multiple coefficients, // so don't try to decode coeffs for those higher levels for (i = coeff_index+1; i <= coeff_index+zero_run; i++) s->num_coded_frags[plane][i]--; coeff_i++; } } if (blocks_ended > s->num_coded_frags[plane][coeff_index]) av_log(s->avctx, AV_LOG_ERROR, "More blocks ended than coded!\n"); // decrement the number of blocks that have higher coeffecients for each // EOB run at this level if (blocks_ended) for (i = coeff_index+1; i < 64; i++) s->num_coded_frags[plane][i] -= blocks_ended; // setup the next buffer if (plane < 2) s->dct_tokens[plane+1][coeff_index] = dct_tokens + j; else if (coeff_index < 63) s->dct_tokens[0][coeff_index+1] = dct_tokens + j; return eob_run; } static void reverse_dc_prediction(Vp3DecodeContext *s, int first_fragment, int fragment_width, int fragment_height); /* * 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; VLC *y_tables[64]; VLC *c_tables[64]; s->dct_tokens[0][0] = s->dct_tokens_base; /* fetch the DC table indexes */ dc_y_table = get_bits(gb, 4); dc_c_table = get_bits(gb, 4); /* unpack the Y plane DC coefficients */ residual_eob_run = unpack_vlcs(s, gb, &s->dc_vlc[dc_y_table], 0, 0, residual_eob_run); /* reverse prediction of the Y-plane DC coefficients */ reverse_dc_prediction(s, 0, s->fragment_width, s->fragment_height); /* unpack the C plane DC coefficients */ residual_eob_run = unpack_vlcs(s, gb, &s->dc_vlc[dc_c_table], 0, 1, residual_eob_run); residual_eob_run = unpack_vlcs(s, gb, &s->dc_vlc[dc_c_table], 0, 2, residual_eob_run); /* reverse prediction of the C-plane DC coefficients */ if (!(s->avctx->flags & CODEC_FLAG_GRAY)) { reverse_dc_prediction(s, s->fragment_start[1], s->fragment_width / 2, s->fragment_height / 2); reverse_dc_prediction(s, s->fragment_start[2], s->fragment_width / 2, s->fragment_height / 2); } /* fetch the AC table indexes */ ac_y_table = get_bits(gb, 4); ac_c_table = get_bits(gb, 4); /* build tables of AC VLC tables */ for (i = 1; i <= 5; i++) { y_tables[i] = &s->ac_vlc_1[ac_y_table]; c_tables[i] = &s->ac_vlc_1[ac_c_table]; } for (i = 6; i <= 14; i++) { y_tables[i] = &s->ac_vlc_2[ac_y_table]; c_tables[i] = &s->ac_vlc_2[ac_c_table]; } for (i = 15; i <= 27; i++) { y_tables[i] = &s->ac_vlc_3[ac_y_table]; c_tables[i] = &s->ac_vlc_3[ac_c_table]; } for (i = 28; i <= 63; i++) { y_tables[i] = &s->ac_vlc_4[ac_y_table]; c_tables[i] = &s->ac_vlc_4[ac_c_table]; } /* decode all AC coefficents */ for (i = 1; i <= 63; i++) { residual_eob_run = unpack_vlcs(s, gb, y_tables[i], i, 0, residual_eob_run); residual_eob_run = unpack_vlcs(s, gb, c_tables[i], i, 1, residual_eob_run); residual_eob_run = unpack_vlcs(s, gb, c_tables[i], i, 2, 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 DC_COEFF(u) s->all_fragments[u].dc 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; int predicted_dc; /* DC values for the left, up-left, up, and up-right fragments */ int vl, vul, vu, vur; /* indexes 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 */ static const int predictor_transform[16][4] = { { 0, 0, 0, 0}, { 0, 0, 0,128}, // PL { 0, 0,128, 0}, // PUR { 0, 0, 53, 75}, // PUR|PL { 0,128, 0, 0}, // PU { 0, 64, 0, 64}, // PU|PL { 0,128, 0, 0}, // PU|PUR { 0, 0, 53, 75}, // PU|PUR|PL {128, 0, 0, 0}, // PUL { 0, 0, 0,128}, // PUL|PL { 64, 0, 64, 0}, // PUL|PUR { 0, 0, 53, 75}, // PUL|PUR|PL { 0,128, 0, 0}, // PUL|PU {-104,116, 0,116}, // PUL|PU|PL { 24, 80, 24, 0}, // PUL|PU|PUR {-104,116, 0,116} // 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. */ static const unsigned char compatible_frame[9] = { 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 */ 3 /* MODE_COPY */ }; int current_frame_type; /* there is a last DC predictor for each of the 3 frame types */ short last_dc[3]; int transform = 0; 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]; transform= 0; if(x){ l= i-1; vl = DC_COEFF(l); if(COMPATIBLE_FRAME(l)) transform |= PL; } if(y){ u= i-fragment_width; vu = DC_COEFF(u); if(COMPATIBLE_FRAME(u)) transform |= PU; if(x){ ul= i-fragment_width-1; vul = DC_COEFF(ul); if(COMPATIBLE_FRAME(ul)) transform |= PUL; } if(x + 1 < fragment_width){ ur= i-fragment_width+1; vur = DC_COEFF(ur); if(COMPATIBLE_FRAME(ur)) transform |= PUR; } } if (transform == 0) { /* if there were no fragments to predict from, use last * DC saved */ predicted_dc = last_dc[current_frame_type]; } 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); predicted_dc /= 128; /* check for outranging on the [ul u l] and * [ul u ur l] predictors */ if ((transform == 15) || (transform == 13)) { if (FFABS(predicted_dc - vu) > 128) predicted_dc = vu; else if (FFABS(predicted_dc - vl) > 128) predicted_dc = vl; else if (FFABS(predicted_dc - vul) > 128) predicted_dc = vul; } } /* at long last, apply the predictor */ DC_COEFF(i) += predicted_dc; /* save the DC */ last_dc[current_frame_type] = DC_COEFF(i); } } } } static void apply_loop_filter(Vp3DecodeContext *s, int plane, int ystart, int yend) { int x, y; int *bounding_values= s->bounding_values_array+127; int width = s->fragment_width >> !!plane; int height = s->fragment_height >> !!plane; int fragment = s->fragment_start [plane] + ystart * width; int stride = s->current_frame.linesize[plane]; uint8_t *plane_data = s->current_frame.data [plane]; if (!s->flipped_image) stride = -stride; plane_data += s->data_offset[plane] + 8*ystart*stride; for (y = ystart; y < yend; y++) { for (x = 0; x < width; x++) { /* This code basically just deblocks on the edges of coded blocks. * However, it has to be much more complicated because of the * braindamaged deblock ordering used in VP3/Theora. Order matters * because some pixels get filtered twice. */ if( s->all_fragments[fragment].coding_method != MODE_COPY ) { /* do not perform left edge filter for left columns frags */ if (x > 0) { s->dsp.vp3_h_loop_filter( plane_data + 8*x, stride, bounding_values); } /* do not perform top edge filter for top row fragments */ if (y > 0) { s->dsp.vp3_v_loop_filter( plane_data + 8*x, stride, bounding_values); } /* do not perform right edge filter for right column * fragments or if right fragment neighbor is also coded * in this frame (it will be filtered in next iteration) */ if ((x < width - 1) && (s->all_fragments[fragment + 1].coding_method == MODE_COPY)) { s->dsp.vp3_h_loop_filter( plane_data + 8*x + 8, stride, bounding_values); } /* do not perform bottom edge filter for bottom row * fragments or if bottom fragment neighbor is also coded * in this frame (it will be filtered in the next row) */ if ((y < height - 1) && (s->all_fragments[fragment + width].coding_method == MODE_COPY)) { s->dsp.vp3_v_loop_filter( plane_data + 8*x + 8*stride, stride, bounding_values); } } fragment++; } plane_data += 8*stride; } } /** * Pulls DCT tokens from the 64 levels to decode and dequant the coefficients * for the next block in coding order */ static inline int vp3_dequant(Vp3DecodeContext *s, Vp3Fragment *frag, int plane, int inter, DCTELEM block[64]) { int16_t *dequantizer = s->qmat[frag->qpi][inter][plane]; uint8_t *perm = s->scantable.permutated; int i = 0; do { int token = *s->dct_tokens[plane][i]; switch (token & 3) { case 0: // EOB if (--token < 4) // 0-3 are token types, so the EOB run must now be 0 s->dct_tokens[plane][i]++; else *s->dct_tokens[plane][i] = token & ~3; goto end; case 1: // zero run s->dct_tokens[plane][i]++; i += (token >> 2) & 0x7f; block[perm[i]] = (token >> 9) * dequantizer[perm[i]]; i++; break; case 2: // coeff block[perm[i]] = (token >> 2) * dequantizer[perm[i]]; s->dct_tokens[plane][i++]++; break; default: av_log(s->avctx, AV_LOG_ERROR, "internal: invalid token type\n"); return i; } } while (i < 64); end: // the actual DC+prediction is in the fragment structure block[0] = frag->dc * s->qmat[0][inter][plane][0]; return i; } /** * called when all pixels up to row y are complete */ static void vp3_draw_horiz_band(Vp3DecodeContext *s, int y) { int h, cy; int offset[4]; if(s->avctx->draw_horiz_band==NULL) return; h= y - s->last_slice_end; y -= h; if (!s->flipped_image) { if (y == 0) h -= s->height - s->avctx->height; // account for non-mod16 y = s->height - y - h; } cy = y >> 1; offset[0] = s->current_frame.linesize[0]*y; offset[1] = s->current_frame.linesize[1]*cy; offset[2] = s->current_frame.linesize[2]*cy; offset[3] = 0; emms_c(); s->avctx->draw_horiz_band(s->avctx, &s->current_frame, offset, y, 3, h); s->last_slice_end= y + h; } /* * Perform the final rendering for a particular slice of data. * The slice number ranges from 0..(c_superblock_height - 1). */ static void render_slice(Vp3DecodeContext *s, int slice) { int x, y, i, j; LOCAL_ALIGNED_16(DCTELEM, block, [64]); int motion_x = 0xdeadbeef, motion_y = 0xdeadbeef; int motion_halfpel_index; uint8_t *motion_source; int plane, first_pixel; if (slice >= s->c_superblock_height) return; for (plane = 0; plane < 3; plane++) { uint8_t *output_plane = s->current_frame.data [plane] + s->data_offset[plane]; uint8_t * last_plane = s-> last_frame.data [plane] + s->data_offset[plane]; uint8_t *golden_plane = s-> golden_frame.data [plane] + s->data_offset[plane]; int stride = s->current_frame.linesize[plane]; int plane_width = s->width >> !!plane; int plane_height = s->height >> !!plane; int sb_x, sb_y = slice << !plane; int slice_height = sb_y + (plane ? 1 : 2); int slice_width = plane ? s->c_superblock_width : s->y_superblock_width; int fragment_width = s->fragment_width >> !!plane; int fragment_height = s->fragment_height >> !!plane; int fragment_start = s->fragment_start[plane]; if (!s->flipped_image) stride = -stride; if (CONFIG_GRAY && plane && (s->avctx->flags & CODEC_FLAG_GRAY)) continue; if(FFABS(stride) > 2048) return; //various tables are fixed size /* for each superblock row in the slice (both of them)... */ for (; sb_y < slice_height; sb_y++) { /* for each superblock in a row... */ for (sb_x = 0; sb_x < slice_width; sb_x++) { /* for each block in a superblock... */ for (j = 0; j < 16; j++) { x = 4*sb_x + hilbert_offset[j][0]; y = 4*sb_y + hilbert_offset[j][1]; i = fragment_start + y*fragment_width + x; // bounds check if (x >= fragment_width || y >= fragment_height) continue; first_pixel = 8*y*stride + 8*x; /* transform if this block was coded */ if (s->all_fragments[i].coding_method != MODE_COPY) { int intra = s->all_fragments[i].coding_method == MODE_INTRA; if ((s->all_fragments[i].coding_method == MODE_USING_GOLDEN) || (s->all_fragments[i].coding_method == MODE_GOLDEN_MV)) motion_source= golden_plane; else motion_source= last_plane; motion_source += first_pixel; motion_halfpel_index = 0; /* sort out the motion vector if this fragment is coded * using a motion vector method */ if ((s->all_fragments[i].coding_method > MODE_INTRA) && (s->all_fragments[i].coding_method != MODE_USING_GOLDEN)) { int src_x, src_y; motion_x = s->all_fragments[i].motion_x; motion_y = s->all_fragments[i].motion_y; if(plane){ motion_x= (motion_x>>1) | (motion_x&1); motion_y= (motion_y>>1) | (motion_y&1); } src_x= (motion_x>>1) + 8*x; src_y= (motion_y>>1) + 8*y; if ((motion_x == 127) || (motion_y == 127)) av_log(s->avctx, AV_LOG_ERROR, " help! got invalid motion vector! (%X, %X)\n", motion_x, motion_y); motion_halfpel_index = motion_x & 0x01; motion_source += (motion_x >> 1); motion_halfpel_index |= (motion_y & 0x01) << 1; motion_source += ((motion_y >> 1) * stride); if(src_x<0 || src_y<0 || src_x + 9 >= plane_width || src_y + 9 >= plane_height){ uint8_t *temp= s->edge_emu_buffer; if(stride<0) temp -= 9*stride; else temp += 9*stride; ff_emulated_edge_mc(temp, motion_source, stride, 9, 9, src_x, src_y, plane_width, plane_height); motion_source= temp; } } /* first, take care of copying a block from either the * previous or the golden frame */ if (s->all_fragments[i].coding_method != MODE_INTRA) { /* Note, it is possible to implement all MC cases with put_no_rnd_pixels_l2 which would look more like the VP3 source but this would be slower as put_no_rnd_pixels_tab is better optimzed */ if(motion_halfpel_index != 3){ s->dsp.put_no_rnd_pixels_tab[1][motion_halfpel_index]( output_plane + first_pixel, motion_source, stride, 8); }else{ int d= (motion_x ^ motion_y)>>31; // d is 0 if motion_x and _y have the same sign, else -1 s->dsp.put_no_rnd_pixels_l2[1]( output_plane + first_pixel, motion_source - d, motion_source + stride + 1 + d, stride, 8); } } s->dsp.clear_block(block); vp3_dequant(s, s->all_fragments + i, plane, !intra, block); /* invert DCT and place (or add) in final output */ if (s->all_fragments[i].coding_method == MODE_INTRA) { if(s->avctx->idct_algo!=FF_IDCT_VP3) block[0] += 128<<3; s->dsp.idct_put( output_plane + first_pixel, stride, block); } else { s->dsp.idct_add( output_plane + first_pixel, stride, block); } } else { /* copy directly from the previous frame */ s->dsp.put_pixels_tab[1][0]( output_plane + first_pixel, last_plane + first_pixel, stride, 8); } } } // Filter up to the last row in the superblock row apply_loop_filter(s, plane, 4*sb_y - !!sb_y, FFMIN(4*sb_y+3, fragment_height-1)); } } /* this looks like a good place for slice dispatch... */ /* algorithm: * if (slice == s->macroblock_height - 1) * dispatch (both last slice & 2nd-to-last slice); * else if (slice > 0) * dispatch (slice - 1); */ vp3_draw_horiz_band(s, 64*slice + 64-16); } /* * This is the ffmpeg/libavcodec API init function. */ static av_cold int vp3_decode_init(AVCodecContext *avctx) { Vp3DecodeContext *s = avctx->priv_data; int i, inter, plane; int c_width; int c_height; if (avctx->codec_tag == MKTAG('V','P','3','0')) s->version = 0; else s->version = 1; s->avctx = avctx; s->width = FFALIGN(avctx->width, 16); s->height = FFALIGN(avctx->height, 16); avctx->pix_fmt = PIX_FMT_YUV420P; avctx->chroma_sample_location = AVCHROMA_LOC_CENTER; if(avctx->idct_algo==FF_IDCT_AUTO) avctx->idct_algo=FF_IDCT_VP3; dsputil_init(&s->dsp, avctx); ff_init_scantable(s->dsp.idct_permutation, &s->scantable, ff_zigzag_direct); /* initialize to an impossible value which will force a recalculation * in the first frame decode */ for (i = 0; i < 3; i++) s->qps[i] = -1; s->y_superblock_width = (s->width + 31) / 32; s->y_superblock_height = (s->height + 31) / 32; s->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; s->c_superblock_count = s->c_superblock_width * s->c_superblock_height; s->superblock_count = s->y_superblock_count + (s->c_superblock_count * 2); s->u_superblock_start = s->y_superblock_count; s->v_superblock_start = s->u_superblock_start + s->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->fragment_start[1] = s->fragment_width * s->fragment_height; s->fragment_start[2] = s->fragment_width * s->fragment_height * 5 / 4; s->all_fragments = av_malloc(s->fragment_count * sizeof(Vp3Fragment)); s->coded_fragment_list[0] = av_malloc(s->fragment_count * sizeof(int)); s->dct_tokens_base = av_malloc(64*s->fragment_count * sizeof(*s->dct_tokens_base)); if (!s->superblock_coding || !s->all_fragments || !s->dct_tokens_base || !s->coded_fragment_list[0]) { vp3_decode_end(avctx); return -1; } if (!s->theora_tables) { for (i = 0; i < 64; i++) { s->coded_dc_scale_factor[i] = vp31_dc_scale_factor[i]; s->coded_ac_scale_factor[i] = vp31_ac_scale_factor[i]; s->base_matrix[0][i] = vp31_intra_y_dequant[i]; s->base_matrix[1][i] = vp31_intra_c_dequant[i]; s->base_matrix[2][i] = vp31_inter_dequant[i]; s->filter_limit_values[i] = vp31_filter_limit_values[i]; } for(inter=0; inter<2; inter++){ for(plane=0; plane<3; plane++){ s->qr_count[inter][plane]= 1; s->qr_size [inter][plane][0]= 63; s->qr_base [inter][plane][0]= s->qr_base [inter][plane][1]= 2*inter + (!!plane)*!inter; } } /* 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, 0); /* 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, 0); /* 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, 0); /* 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, 0); /* 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, 0); } } else { for (i = 0; i < 16; i++) { /* DC histograms */ if (init_vlc(&s->dc_vlc[i], 5, 32, &s->huffman_table[i][0][1], 4, 2, &s->huffman_table[i][0][0], 4, 2, 0) < 0) goto vlc_fail; /* group 1 AC histograms */ if (init_vlc(&s->ac_vlc_1[i], 5, 32, &s->huffman_table[i+16][0][1], 4, 2, &s->huffman_table[i+16][0][0], 4, 2, 0) < 0) goto vlc_fail; /* group 2 AC histograms */ if (init_vlc(&s->ac_vlc_2[i], 5, 32, &s->huffman_table[i+16*2][0][1], 4, 2, &s->huffman_table[i+16*2][0][0], 4, 2, 0) < 0) goto vlc_fail; /* group 3 AC histograms */ if (init_vlc(&s->ac_vlc_3[i], 5, 32, &s->huffman_table[i+16*3][0][1], 4, 2, &s->huffman_table[i+16*3][0][0], 4, 2, 0) < 0) goto vlc_fail; /* group 4 AC histograms */ if (init_vlc(&s->ac_vlc_4[i], 5, 32, &s->huffman_table[i+16*4][0][1], 4, 2, &s->huffman_table[i+16*4][0][0], 4, 2, 0) < 0) goto vlc_fail; } } init_vlc(&s->superblock_run_length_vlc, 6, 34, &superblock_run_length_vlc_table[0][1], 4, 2, &superblock_run_length_vlc_table[0][0], 4, 2, 0); init_vlc(&s->fragment_run_length_vlc, 5, 30, &fragment_run_length_vlc_table[0][1], 4, 2, &fragment_run_length_vlc_table[0][0], 4, 2, 0); init_vlc(&s->mode_code_vlc, 3, 8, &mode_code_vlc_table[0][1], 2, 1, &mode_code_vlc_table[0][0], 2, 1, 0); init_vlc(&s->motion_vector_vlc, 6, 63, &motion_vector_vlc_table[0][1], 2, 1, &motion_vector_vlc_table[0][0], 2, 1, 0); /* work out the block mapping tables */ s->superblock_fragments = av_malloc(s->superblock_count * 16 * sizeof(int)); s->macroblock_coding = av_malloc(s->macroblock_count + 1); if (!s->superblock_fragments || !s->macroblock_coding) { vp3_decode_end(avctx); return -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; vlc_fail: av_log(avctx, AV_LOG_FATAL, "Invalid huffman table\n"); return -1; } /* * This is the ffmpeg/libavcodec API frame decode function. */ static int vp3_decode_frame(AVCodecContext *avctx, void *data, int *data_size, AVPacket *avpkt) { const uint8_t *buf = avpkt->data; int buf_size = avpkt->size; Vp3DecodeContext *s = avctx->priv_data; GetBitContext gb; static int counter = 0; int i; init_get_bits(&gb, buf, buf_size * 8); if (s->theora && get_bits1(&gb)) { av_log(avctx, AV_LOG_ERROR, "Header packet passed to frame decoder, skipping\n"); return -1; } s->keyframe = !get_bits1(&gb); if (!s->theora) skip_bits(&gb, 1); for (i = 0; i < 3; i++) s->last_qps[i] = s->qps[i]; s->nqps=0; do{ s->qps[s->nqps++]= get_bits(&gb, 6); } while(s->theora >= 0x030200 && s->nqps<3 && get_bits1(&gb)); for (i = s->nqps; i < 3; i++) s->qps[i] = -1; if (s->avctx->debug & FF_DEBUG_PICT_INFO) av_log(s->avctx, AV_LOG_INFO, " VP3 %sframe #%d: Q index = %d\n", s->keyframe?"key":"", counter, s->qps[0]); counter++; if (s->qps[0] != s->last_qps[0]) init_loop_filter(s); for (i = 0; i < s->nqps; i++) // reinit all dequantizers if the first one changed, because // the DC of the first quantizer must be used for all matrices if (s->qps[i] != s->last_qps[i] || s->qps[0] != s->last_qps[0]) init_dequantizer(s, i); if (avctx->skip_frame >= AVDISCARD_NONKEY && !s->keyframe) return buf_size; if (s->keyframe) { if (!s->theora) { skip_bits(&gb, 4); /* width code */ skip_bits(&gb, 4); /* height code */ if (s->version) { s->version = get_bits(&gb, 5); if (counter == 1) av_log(s->avctx, AV_LOG_DEBUG, "VP version: %d\n", s->version); } } if (s->version || s->theora) { if (get_bits1(&gb)) av_log(s->avctx, AV_LOG_ERROR, "Warning, unsupported keyframe coding type?!\n"); skip_bits(&gb, 2); /* reserved? */ } if (s->last_frame.data[0] == s->golden_frame.data[0]) { if (s->golden_frame.data[0]) avctx->release_buffer(avctx, &s->golden_frame); s->last_frame= s->golden_frame; /* ensure that we catch any access to this released 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 = 3; if(avctx->get_buffer(avctx, &s->golden_frame) < 0) { av_log(s->avctx, AV_LOG_ERROR, "vp3: get_buffer() failed\n"); return -1; } /* golden frame is also the current frame */ s->current_frame= s->golden_frame; } else { /* allocate a new current frame */ s->current_frame.reference = 3; if (!s->golden_frame.data[0]) { av_log(s->avctx, AV_LOG_ERROR, "vp3: first frame not a keyframe\n"); return -1; } if(avctx->get_buffer(avctx, &s->current_frame) < 0) { av_log(s->avctx, AV_LOG_ERROR, "vp3: get_buffer() failed\n"); return -1; } } s->current_frame.qscale_table= s->qscale_table; //FIXME allocate individual tables per AVFrame s->current_frame.qstride= 0; init_frame(s, &gb); if (unpack_superblocks(s, &gb)){ av_log(s->avctx, AV_LOG_ERROR, "error in unpack_superblocks\n"); return -1; } if (unpack_modes(s, &gb)){ av_log(s->avctx, AV_LOG_ERROR, "error in unpack_modes\n"); return -1; } if (unpack_vectors(s, &gb)){ av_log(s->avctx, AV_LOG_ERROR, "error in unpack_vectors\n"); return -1; } if (unpack_block_qpis(s, &gb)){ av_log(s->avctx, AV_LOG_ERROR, "error in unpack_block_qpis\n"); return -1; } if (unpack_dct_coeffs(s, &gb)){ av_log(s->avctx, AV_LOG_ERROR, "error in unpack_dct_coeffs\n"); return -1; } for (i = 0; i < 3; i++) { if (s->flipped_image) s->data_offset[i] = 0; else s->data_offset[i] = ((s->height>>!!i)-1) * s->current_frame.linesize[i]; } s->last_slice_end = 0; for (i = 0; i < s->c_superblock_height; i++) render_slice(s, i); // filter the last row for (i = 0; i < 3; i++) { int row = (s->height >> (3+!!i)) - 1; apply_loop_filter(s, i, row, row+1); } vp3_draw_horiz_band(s, s->height); *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) */ s->last_frame= s->current_frame; s->current_frame.data[0]= NULL; /* ensure that we catch any access to this released frame */ return buf_size; } /* * This is the ffmpeg/libavcodec API module cleanup function. */ static av_cold int vp3_decode_end(AVCodecContext *avctx) { Vp3DecodeContext *s = avctx->priv_data; int i; av_free(s->superblock_coding); av_free(s->all_fragments); av_free(s->coded_fragment_list[0]); av_free(s->dct_tokens_base); av_free(s->superblock_fragments); av_free(s->macroblock_coding); for (i = 0; i < 16; i++) { free_vlc(&s->dc_vlc[i]); free_vlc(&s->ac_vlc_1[i]); free_vlc(&s->ac_vlc_2[i]); free_vlc(&s->ac_vlc_3[i]); free_vlc(&s->ac_vlc_4[i]); } free_vlc(&s->superblock_run_length_vlc); free_vlc(&s->fragment_run_length_vlc); free_vlc(&s->mode_code_vlc); free_vlc(&s->motion_vector_vlc); /* release all frames */ if (s->golden_frame.data[0] && s->golden_frame.data[0] != s->last_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; } static int read_huffman_tree(AVCodecContext *avctx, GetBitContext *gb) { Vp3DecodeContext *s = avctx->priv_data; if (get_bits1(gb)) { int token; if (s->entries >= 32) { /* overflow */ av_log(avctx, AV_LOG_ERROR, "huffman tree overflow\n"); return -1; } token = get_bits(gb, 5); //av_log(avctx, AV_LOG_DEBUG, "hti %d hbits %x token %d entry : %d size %d\n", s->hti, s->hbits, token, s->entries, s->huff_code_size); s->huffman_table[s->hti][token][0] = s->hbits; s->huffman_table[s->hti][token][1] = s->huff_code_size; s->entries++; } else { if (s->huff_code_size >= 32) {/* overflow */ av_log(avctx, AV_LOG_ERROR, "huffman tree overflow\n"); return -1; } s->huff_code_size++; s->hbits <<= 1; if (read_huffman_tree(avctx, gb)) return -1; s->hbits |= 1; if (read_huffman_tree(avctx, gb)) return -1; s->hbits >>= 1; s->huff_code_size--; } return 0; } #if CONFIG_THEORA_DECODER static int theora_decode_header(AVCodecContext *avctx, GetBitContext *gb) { Vp3DecodeContext *s = avctx->priv_data; int visible_width, visible_height, colorspace; s->theora = get_bits_long(gb, 24); av_log(avctx, AV_LOG_DEBUG, "Theora bitstream version %X\n", s->theora); /* 3.2.0 aka alpha3 has the same frame orientation as original vp3 */ /* but previous versions have the image flipped relative to vp3 */ if (s->theora < 0x030200) { s->flipped_image = 1; av_log(avctx, AV_LOG_DEBUG, "Old (width = get_bits(gb, 16) << 4; visible_height = s->height = get_bits(gb, 16) << 4; if(avcodec_check_dimensions(avctx, s->width, s->height)){ av_log(avctx, AV_LOG_ERROR, "Invalid dimensions (%dx%d)\n", s->width, s->height); s->width= s->height= 0; return -1; } if (s->theora >= 0x030200) { visible_width = get_bits_long(gb, 24); visible_height = get_bits_long(gb, 24); skip_bits(gb, 8); /* offset x */ skip_bits(gb, 8); /* offset y */ } skip_bits(gb, 32); /* fps numerator */ skip_bits(gb, 32); /* fps denumerator */ skip_bits(gb, 24); /* aspect numerator */ skip_bits(gb, 24); /* aspect denumerator */ if (s->theora < 0x030200) skip_bits(gb, 5); /* keyframe frequency force */ colorspace = get_bits(gb, 8); skip_bits(gb, 24); /* bitrate */ skip_bits(gb, 6); /* quality hint */ if (s->theora >= 0x030200) { skip_bits(gb, 5); /* keyframe frequency force */ skip_bits(gb, 2); /* pixel format: 420,res,422,444 */ skip_bits(gb, 3); /* reserved */ } // align_get_bits(gb); if ( visible_width <= s->width && visible_width > s->width-16 && visible_height <= s->height && visible_height > s->height-16) avcodec_set_dimensions(avctx, visible_width, visible_height); else avcodec_set_dimensions(avctx, s->width, s->height); if (colorspace == 1) { avctx->color_primaries = AVCOL_PRI_BT470M; } else if (colorspace == 2) { avctx->color_primaries = AVCOL_PRI_BT470BG; } if (colorspace == 1 || colorspace == 2) { avctx->colorspace = AVCOL_SPC_BT470BG; avctx->color_trc = AVCOL_TRC_BT709; } return 0; } static int theora_decode_tables(AVCodecContext *avctx, GetBitContext *gb) { Vp3DecodeContext *s = avctx->priv_data; int i, n, matrices, inter, plane; if (s->theora >= 0x030200) { n = get_bits(gb, 3); /* loop filter limit values table */ for (i = 0; i < 64; i++) { s->filter_limit_values[i] = get_bits(gb, n); if (s->filter_limit_values[i] > 127) { av_log(avctx, AV_LOG_ERROR, "filter limit value too large (%i > 127), clamping\n", s->filter_limit_values[i]); s->filter_limit_values[i] = 127; } } } if (s->theora >= 0x030200) n = get_bits(gb, 4) + 1; else n = 16; /* quality threshold table */ for (i = 0; i < 64; i++) s->coded_ac_scale_factor[i] = get_bits(gb, n); if (s->theora >= 0x030200) n = get_bits(gb, 4) + 1; else n = 16; /* dc scale factor table */ for (i = 0; i < 64; i++) s->coded_dc_scale_factor[i] = get_bits(gb, n); if (s->theora >= 0x030200) matrices = get_bits(gb, 9) + 1; else matrices = 3; if(matrices > 384){ av_log(avctx, AV_LOG_ERROR, "invalid number of base matrixes\n"); return -1; } for(n=0; nbase_matrix[n][i]= get_bits(gb, 8); } for (inter = 0; inter <= 1; inter++) { for (plane = 0; plane <= 2; plane++) { int newqr= 1; if (inter || plane > 0) newqr = get_bits1(gb); if (!newqr) { int qtj, plj; if(inter && get_bits1(gb)){ qtj = 0; plj = plane; }else{ qtj= (3*inter + plane - 1) / 3; plj= (plane + 2) % 3; } s->qr_count[inter][plane]= s->qr_count[qtj][plj]; memcpy(s->qr_size[inter][plane], s->qr_size[qtj][plj], sizeof(s->qr_size[0][0])); memcpy(s->qr_base[inter][plane], s->qr_base[qtj][plj], sizeof(s->qr_base[0][0])); } else { int qri= 0; int qi = 0; for(;;){ i= get_bits(gb, av_log2(matrices-1)+1); if(i>= matrices){ av_log(avctx, AV_LOG_ERROR, "invalid base matrix index\n"); return -1; } s->qr_base[inter][plane][qri]= i; if(qi >= 63) break; i = get_bits(gb, av_log2(63-qi)+1) + 1; s->qr_size[inter][plane][qri++]= i; qi += i; } if (qi > 63) { av_log(avctx, AV_LOG_ERROR, "invalid qi %d > 63\n", qi); return -1; } s->qr_count[inter][plane]= qri; } } } /* Huffman tables */ for (s->hti = 0; s->hti < 80; s->hti++) { s->entries = 0; s->huff_code_size = 1; if (!get_bits1(gb)) { s->hbits = 0; if(read_huffman_tree(avctx, gb)) return -1; s->hbits = 1; if(read_huffman_tree(avctx, gb)) return -1; } } s->theora_tables = 1; return 0; } static av_cold int theora_decode_init(AVCodecContext *avctx) { Vp3DecodeContext *s = avctx->priv_data; GetBitContext gb; int ptype; uint8_t *header_start[3]; int header_len[3]; int i; s->theora = 1; if (!avctx->extradata_size) { av_log(avctx, AV_LOG_ERROR, "Missing extradata!\n"); return -1; } if (ff_split_xiph_headers(avctx->extradata, avctx->extradata_size, 42, header_start, header_len) < 0) { av_log(avctx, AV_LOG_ERROR, "Corrupt extradata\n"); return -1; } for(i=0;i<3;i++) { init_get_bits(&gb, header_start[i], header_len[i] * 8); ptype = get_bits(&gb, 8); if (!(ptype & 0x80)) { av_log(avctx, AV_LOG_ERROR, "Invalid extradata!\n"); // return -1; } // FIXME: Check for this as well. skip_bits_long(&gb, 6*8); /* "theora" */ switch(ptype) { case 0x80: theora_decode_header(avctx, &gb); break; case 0x81: // FIXME: is this needed? it breaks sometimes // theora_decode_comments(avctx, gb); break; case 0x82: if (theora_decode_tables(avctx, &gb)) return -1; break; default: av_log(avctx, AV_LOG_ERROR, "Unknown Theora config packet: %d\n", ptype&~0x80); break; } if(ptype != 0x81 && 8*header_len[i] != get_bits_count(&gb)) av_log(avctx, AV_LOG_WARNING, "%d bits left in packet %X\n", 8*header_len[i] - get_bits_count(&gb), ptype); if (s->theora < 0x030200) break; } return vp3_decode_init(avctx); } AVCodec theora_decoder = { "theora", CODEC_TYPE_VIDEO, CODEC_ID_THEORA, sizeof(Vp3DecodeContext), theora_decode_init, NULL, vp3_decode_end, vp3_decode_frame, CODEC_CAP_DR1 | CODEC_CAP_DRAW_HORIZ_BAND, NULL, .long_name = NULL_IF_CONFIG_SMALL("Theora"), }; #endif AVCodec vp3_decoder = { "vp3", CODEC_TYPE_VIDEO, CODEC_ID_VP3, sizeof(Vp3DecodeContext), vp3_decode_init, NULL, vp3_decode_end, vp3_decode_frame, CODEC_CAP_DR1 | CODEC_CAP_DRAW_HORIZ_BAND, NULL, .long_name = NULL_IF_CONFIG_SMALL("On2 VP3"), };