/* * DV decoder * Copyright (c) 2002 Fabrice Bellard. * * DV encoder * Copyright (c) 2003 Roman Shaposhnik. * * Many thanks to Dan Dennedy for providing wealth * of DV technical info. * * 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 */ /** * @file dv.c * DV codec. */ #include "avcodec.h" #include "dsputil.h" #include "mpegvideo.h" #include "simple_idct.h" #include "dvdata.h" typedef struct DVVideoDecodeContext { const DVprofile* sys; AVFrame picture; uint8_t dv_zigzag[2][64]; uint8_t dv_idct_shift[2][22][64]; void (*get_pixels)(DCTELEM *block, const uint8_t *pixels, int line_size); void (*fdct[2])(DCTELEM *block); void (*idct_put[2])(uint8_t *dest, int line_size, DCTELEM *block); GetBitContext gb; DCTELEM block[5*6][64] __align8; } DVVideoDecodeContext; #define TEX_VLC_BITS 9 #ifdef DV_CODEC_TINY_TARGET #define DV_VLC_MAP_RUN_SIZE 15 #define DV_VLC_MAP_LEV_SIZE 23 #else #define DV_VLC_MAP_RUN_SIZE 64 #define DV_VLC_MAP_LEV_SIZE 512 #endif /* XXX: also include quantization */ static RL_VLC_ELEM *dv_rl_vlc[1]; /* VLC encoding lookup table */ static struct dv_vlc_pair { uint32_t vlc; uint8_t size; } (*dv_vlc_map)[DV_VLC_MAP_LEV_SIZE] = NULL; static void dv_build_unquantize_tables(DVVideoDecodeContext *s, uint8_t* perm) { int i, q, j; /* NOTE: max left shift is 6 */ for(q = 0; q < 22; q++) { /* 88DCT */ for(i = 1; i < 64; i++) { /* 88 table */ j = perm[i]; s->dv_idct_shift[0][q][j] = dv_quant_shifts[q][dv_88_areas[i]] + 1; } /* 248DCT */ for(i = 1; i < 64; i++) { /* 248 table */ s->dv_idct_shift[1][q][i] = dv_quant_shifts[q][dv_248_areas[i]] + 1; } } } static int dvvideo_init(AVCodecContext *avctx) { DVVideoDecodeContext *s = avctx->priv_data; DSPContext dsp; static int done=0; int i, j; if (!done) { int i; VLC dv_vlc; done = 1; dv_vlc_map = av_mallocz(DV_VLC_MAP_LEV_SIZE*DV_VLC_MAP_RUN_SIZE*sizeof(struct dv_vlc_pair)); if (!dv_vlc_map) return -ENOMEM; /* NOTE: as a trick, we use the fact the no codes are unused to accelerate the parsing of partial codes */ init_vlc(&dv_vlc, TEX_VLC_BITS, NB_DV_VLC, dv_vlc_len, 1, 1, dv_vlc_bits, 2, 2); dv_rl_vlc[0] = av_malloc(dv_vlc.table_size * sizeof(RL_VLC_ELEM)); if (!dv_rl_vlc[0]) { av_free(dv_vlc_map); return -ENOMEM; } for(i = 0; i < dv_vlc.table_size; i++){ int code= dv_vlc.table[i][0]; int len = dv_vlc.table[i][1]; int level, run; if(len<0){ //more bits needed run= 0; level= code; } else if (code == (NB_DV_VLC - 1)) { /* EOB */ run = 0; level = 256; } else { run= dv_vlc_run[code] + 1; level= dv_vlc_level[code]; } dv_rl_vlc[0][i].len = len; dv_rl_vlc[0][i].level = level; dv_rl_vlc[0][i].run = run; } for (i = 0; i < NB_DV_VLC - 1; i++) { if (dv_vlc_run[i] >= DV_VLC_MAP_RUN_SIZE || dv_vlc_level[i] >= DV_VLC_MAP_LEV_SIZE) continue; if (dv_vlc_map[dv_vlc_run[i]][dv_vlc_level[i]].size != 0) continue; dv_vlc_map[dv_vlc_run[i]][dv_vlc_level[i]].vlc = dv_vlc_bits[i] << (!!dv_vlc_level[i]); dv_vlc_map[dv_vlc_run[i]][dv_vlc_level[i]].size = dv_vlc_len[i] + (!!dv_vlc_level[i]); } for (i = 0; i < DV_VLC_MAP_RUN_SIZE; i++) { #ifdef DV_CODEC_TINY_TARGET for (j = 1; j < DV_VLC_MAP_LEV_SIZE; j++) { if (dv_vlc_map[i][j].size == 0) { dv_vlc_map[i][j].vlc = dv_vlc_map[0][j].vlc | (dv_vlc_map[i-1][0].vlc << (dv_vlc_map[0][j].size)); dv_vlc_map[i][j].size = dv_vlc_map[i-1][0].size + dv_vlc_map[0][j].size; } } #else for (j = 1; j < DV_VLC_MAP_LEV_SIZE/2; j++) { if (dv_vlc_map[i][j].size == 0) { dv_vlc_map[i][j].vlc = dv_vlc_map[0][j].vlc | (dv_vlc_map[i-1][0].vlc << (dv_vlc_map[0][j].size)); dv_vlc_map[i][j].size = dv_vlc_map[i-1][0].size + dv_vlc_map[0][j].size; } dv_vlc_map[i][((uint16_t)(-j))&0x1ff].vlc = dv_vlc_map[i][j].vlc | 1; dv_vlc_map[i][((uint16_t)(-j))&0x1ff].size = dv_vlc_map[i][j].size; } #endif } } /* Generic DSP setup */ dsputil_init(&dsp, avctx); s->get_pixels = dsp.get_pixels; /* 88DCT setup */ s->fdct[0] = dsp.fdct; s->idct_put[0] = dsp.idct_put; for (i=0; i<64; i++) s->dv_zigzag[0][i] = dsp.idct_permutation[ff_zigzag_direct[i]]; /* 248DCT setup */ s->fdct[1] = dsp.fdct248; s->idct_put[1] = simple_idct248_put; // FIXME: need to add it to DSP memcpy(s->dv_zigzag[1], ff_zigzag248_direct, 64); /* XXX: do it only for constant case */ dv_build_unquantize_tables(s, dsp.idct_permutation); /* FIXME: I really don't think this should be here */ if (dv_codec_profile(avctx)) avctx->pix_fmt = dv_codec_profile(avctx)->pix_fmt; avctx->coded_frame = &s->picture; return 0; } // #define VLC_DEBUG typedef struct BlockInfo { const uint8_t *shift_table; const uint8_t *scan_table; uint8_t pos; /* position in block */ uint8_t eob_reached; /* true if EOB has been reached */ uint8_t dct_mode; uint8_t partial_bit_count; uint16_t partial_bit_buffer; int shift_offset; } BlockInfo; /* block size in bits */ static const uint16_t block_sizes[6] = { 112, 112, 112, 112, 80, 80 }; /* bit budget for AC only in 5 MBs */ static const int vs_total_ac_bits = (100 * 4 + 68*2) * 5; /* see dv_88_areas and dv_248_areas for details */ static const int mb_area_start[5] = { 1, 6, 21, 43, 64 }; #ifndef ALT_BITSTREAM_READER #warning only works with ALT_BITSTREAM_READER #endif /* decode ac coefs */ static void dv_decode_ac(DVVideoDecodeContext *s, BlockInfo *mb, DCTELEM *block, int last_index) { int last_re_index; int shift_offset = mb->shift_offset; const uint8_t *scan_table = mb->scan_table; const uint8_t *shift_table = mb->shift_table; int pos = mb->pos; int level, pos1, sign, run; int partial_bit_count; #ifndef ALT_BITSTREAM_READER //FIXME int re_index=0; int re1_index=0; #endif OPEN_READER(re, &s->gb); #ifdef VLC_DEBUG printf("start\n"); #endif /* if we must parse a partial vlc, we do it here */ partial_bit_count = mb->partial_bit_count; if (partial_bit_count > 0) { uint8_t buf[4]; uint32_t v; int l, l1; GetBitContext gb1; /* build the dummy bit buffer */ l = 16 - partial_bit_count; UPDATE_CACHE(re, &s->gb); #ifdef VLC_DEBUG printf("show=%04x\n", SHOW_UBITS(re, &s->gb, 16)); #endif v = (mb->partial_bit_buffer << l) | SHOW_UBITS(re, &s->gb, l); buf[0] = v >> 8; buf[1] = v; #ifdef VLC_DEBUG printf("v=%04x cnt=%d %04x\n", v, partial_bit_count, (mb->partial_bit_buffer << l)); #endif /* try to read the codeword */ init_get_bits(&gb1, buf, 4*8); { OPEN_READER(re1, &gb1); UPDATE_CACHE(re1, &gb1); GET_RL_VLC(level, run, re1, &gb1, dv_rl_vlc[0], TEX_VLC_BITS, 2); l = re1_index; CLOSE_READER(re1, &gb1); } #ifdef VLC_DEBUG printf("****run=%d level=%d size=%d\n", run, level, l); #endif /* compute codeword length */ l1 = (level != 256 && level != 0); /* if too long, we cannot parse */ l -= partial_bit_count; if ((re_index + l + l1) > last_index) return; /* skip read bits */ last_re_index = 0; /* avoid warning */ re_index += l; /* by definition, if we can read the vlc, all partial bits will be read (otherwise we could have read the vlc before) */ mb->partial_bit_count = 0; UPDATE_CACHE(re, &s->gb); goto handle_vlc; } /* get the AC coefficients until last_index is reached */ for(;;) { UPDATE_CACHE(re, &s->gb); #ifdef VLC_DEBUG printf("%2d: bits=%04x index=%d\n", pos, SHOW_UBITS(re, &s->gb, 16), re_index); #endif last_re_index = re_index; GET_RL_VLC(level, run, re, &s->gb, dv_rl_vlc[0], TEX_VLC_BITS, 2); handle_vlc: #ifdef VLC_DEBUG printf("run=%d level=%d\n", run, level); #endif if (level == 256) { if (re_index > last_index) { cannot_read: /* put position before read code */ re_index = last_re_index; mb->eob_reached = 0; break; } /* EOB */ mb->eob_reached = 1; break; } else if (level != 0) { if ((re_index + 1) > last_index) goto cannot_read; sign = SHOW_SBITS(re, &s->gb, 1); level = (level ^ sign) - sign; LAST_SKIP_BITS(re, &s->gb, 1); pos += run; /* error */ if (pos >= 64) { goto read_error; } pos1 = scan_table[pos]; level = level << (shift_table[pos1] + shift_offset); block[pos1] = level; // printf("run=%d level=%d shift=%d\n", run, level, shift_table[pos1]); } else { if (re_index > last_index) goto cannot_read; /* level is zero: means run without coding. No sign is coded */ pos += run; /* error */ if (pos >= 64) { read_error: #if defined(VLC_DEBUG) || 1 av_log(NULL, AV_LOG_ERROR, "error pos=%d\n", pos); #endif /* for errors, we consider the eob is reached */ mb->eob_reached = 1; break; } } } CLOSE_READER(re, &s->gb); mb->pos = pos; } static inline void bit_copy(PutBitContext *pb, GetBitContext *gb, int bits_left) { while (bits_left >= 16) { put_bits(pb, 16, get_bits(gb, 16)); bits_left -= 16; } if (bits_left > 0) { put_bits(pb, bits_left, get_bits(gb, bits_left)); } } /* mb_x and mb_y are in units of 8 pixels */ static inline void dv_decode_video_segment(DVVideoDecodeContext *s, uint8_t *buf_ptr1, const uint16_t *mb_pos_ptr) { int quant, dc, dct_mode, class1, j; int mb_index, mb_x, mb_y, v, last_index; DCTELEM *block, *block1; int c_offset, bits_left; uint8_t *y_ptr; BlockInfo mb_data[5 * 6], *mb, *mb1; void (*idct_put)(uint8_t *dest, int line_size, DCTELEM *block); uint8_t *buf_ptr; PutBitContext pb, vs_pb; uint8_t mb_bit_buffer[80 + 4]; /* allow some slack */ int mb_bit_count; uint8_t vs_bit_buffer[5 * 80 + 4]; /* allow some slack */ int vs_bit_count; memset(s->block, 0, sizeof(s->block)); /* pass 1 : read DC and AC coefficients in blocks */ buf_ptr = buf_ptr1; block1 = &s->block[0][0]; mb1 = mb_data; init_put_bits(&vs_pb, vs_bit_buffer, 5 * 80); vs_bit_count = 0; for(mb_index = 0; mb_index < 5; mb_index++) { /* skip header */ quant = buf_ptr[3] & 0x0f; buf_ptr += 4; init_put_bits(&pb, mb_bit_buffer, 80); mb_bit_count = 0; mb = mb1; block = block1; for(j = 0;j < 6; j++) { /* NOTE: size is not important here */ init_get_bits(&s->gb, buf_ptr, 14*8); /* get the dc */ dc = get_bits(&s->gb, 9); dc = (dc << (32 - 9)) >> (32 - 9); dct_mode = get_bits1(&s->gb); mb->dct_mode = dct_mode; mb->scan_table = s->dv_zigzag[dct_mode]; class1 = get_bits(&s->gb, 2); mb->shift_offset = (class1 == 3); mb->shift_table = s->dv_idct_shift[dct_mode] [quant + dv_quant_offset[class1]]; dc = dc << 2; /* convert to unsigned because 128 is not added in the standard IDCT */ dc += 1024; block[0] = dc; last_index = block_sizes[j]; buf_ptr += last_index >> 3; mb->pos = 0; mb->partial_bit_count = 0; #ifdef VLC_DEBUG printf("MB block: %d, %d ", mb_index, j); #endif dv_decode_ac(s, mb, block, last_index); /* write the remaining bits in a new buffer only if the block is finished */ bits_left = last_index - get_bits_count(&s->gb); if (mb->eob_reached) { mb->partial_bit_count = 0; mb_bit_count += bits_left; bit_copy(&pb, &s->gb, bits_left); } else { /* should be < 16 bits otherwise a codeword could have been parsed */ mb->partial_bit_count = bits_left; mb->partial_bit_buffer = get_bits(&s->gb, bits_left); } block += 64; mb++; } flush_put_bits(&pb); /* pass 2 : we can do it just after */ #ifdef VLC_DEBUG printf("***pass 2 size=%d MB#=%d\n", mb_bit_count, mb_index); #endif block = block1; mb = mb1; init_get_bits(&s->gb, mb_bit_buffer, 80*8); for(j = 0;j < 6; j++) { if (!mb->eob_reached && get_bits_count(&s->gb) < mb_bit_count) { dv_decode_ac(s, mb, block, mb_bit_count); /* if still not finished, no need to parse other blocks */ if (!mb->eob_reached) { /* we could not parse the current AC coefficient, so we add the remaining bytes */ bits_left = mb_bit_count - get_bits_count(&s->gb); if (bits_left > 0) { mb->partial_bit_count += bits_left; mb->partial_bit_buffer = (mb->partial_bit_buffer << bits_left) | get_bits(&s->gb, bits_left); } goto next_mb; } } block += 64; mb++; } /* all blocks are finished, so the extra bytes can be used at the video segment level */ bits_left = mb_bit_count - get_bits_count(&s->gb); vs_bit_count += bits_left; bit_copy(&vs_pb, &s->gb, bits_left); next_mb: mb1 += 6; block1 += 6 * 64; } /* we need a pass other the whole video segment */ flush_put_bits(&vs_pb); #ifdef VLC_DEBUG printf("***pass 3 size=%d\n", vs_bit_count); #endif block = &s->block[0][0]; mb = mb_data; init_get_bits(&s->gb, vs_bit_buffer, 5 * 80*8); for(mb_index = 0; mb_index < 5; mb_index++) { for(j = 0;j < 6; j++) { if (!mb->eob_reached) { #ifdef VLC_DEBUG printf("start %d:%d\n", mb_index, j); #endif dv_decode_ac(s, mb, block, vs_bit_count); } block += 64; mb++; } } /* compute idct and place blocks */ block = &s->block[0][0]; mb = mb_data; for(mb_index = 0; mb_index < 5; mb_index++) { v = *mb_pos_ptr++; mb_x = v & 0xff; mb_y = v >> 8; y_ptr = s->picture.data[0] + (mb_y * s->picture.linesize[0] * 8) + (mb_x * 8); if (s->sys->pix_fmt == PIX_FMT_YUV411P) c_offset = (mb_y * s->picture.linesize[1] * 8) + ((mb_x >> 2) * 8); else c_offset = ((mb_y >> 1) * s->picture.linesize[1] * 8) + ((mb_x >> 1) * 8); for(j = 0;j < 6; j++) { idct_put = s->idct_put[mb->dct_mode]; if (j < 4) { if (s->sys->pix_fmt == PIX_FMT_YUV411P && mb_x < (704 / 8)) { /* NOTE: at end of line, the macroblock is handled as 420 */ idct_put(y_ptr + (j * 8), s->picture.linesize[0], block); } else { idct_put(y_ptr + ((j & 1) * 8) + ((j >> 1) * 8 * s->picture.linesize[0]), s->picture.linesize[0], block); } } else { if (s->sys->pix_fmt == PIX_FMT_YUV411P && mb_x >= (704 / 8)) { uint64_t aligned_pixels[64/8]; uint8_t *pixels= (uint8_t*)aligned_pixels; uint8_t *c_ptr, *c_ptr1, *ptr; int y, linesize; /* NOTE: at end of line, the macroblock is handled as 420 */ idct_put(pixels, 8, block); linesize = s->picture.linesize[6 - j]; c_ptr = s->picture.data[6 - j] + c_offset; ptr = pixels; for(y = 0;y < 8; y++) { /* convert to 411P */ c_ptr1 = c_ptr + 8*linesize; c_ptr[0]= ptr[0]; c_ptr1[0]= ptr[4]; c_ptr[1]= ptr[1]; c_ptr1[1]= ptr[5]; c_ptr[2]= ptr[2]; c_ptr1[2]= ptr[6]; c_ptr[3]= ptr[3]; c_ptr1[3]= ptr[7]; c_ptr += linesize; ptr += 8; } } else { /* don't ask me why they inverted Cb and Cr ! */ idct_put(s->picture.data[6 - j] + c_offset, s->picture.linesize[6 - j], block); } } block += 64; mb++; } } } #ifdef DV_CODEC_TINY_TARGET /* Converts run and level (where level != 0) pair into vlc, returning bit size */ static always_inline int dv_rl2vlc(int run, int l, uint32_t* vlc) { int sign = l >> 8; int level = (l ^ sign) - sign; int size; sign = (sign & 1); if (run < DV_VLC_MAP_RUN_SIZE && level < DV_VLC_MAP_LEV_SIZE) { *vlc = dv_vlc_map[run][level].vlc | sign; size = dv_vlc_map[run][level].size; } else { if (level < DV_VLC_MAP_LEV_SIZE) { *vlc = dv_vlc_map[0][level].vlc | sign; size = dv_vlc_map[0][level].size; } else { *vlc = 0xfe00 | (level << 1) | sign; size = 16; } if (run) { *vlc |= ((run < 16) ? dv_vlc_map[run-1][0].vlc : (0x1f80 | (run - 1))) << size; size += (run < 16) ? dv_vlc_map[run-1][0].size : 13; } } return size; } static always_inline int dv_rl2vlc_size(int run, int l) { int level = (l ^ (l >> 8)) - (l >> 8); int size; if (run < DV_VLC_MAP_RUN_SIZE && level < DV_VLC_MAP_LEV_SIZE) { size = dv_vlc_map[run][level].size; } else { size = (level < DV_VLC_MAP_LEV_SIZE) ? dv_vlc_map[0][level].size : 16; if (run) { size += (run < 16) ? dv_vlc_map[run-1][0].size : 13; } } return size; } #else static always_inline int dv_rl2vlc(int run, int l, uint32_t* vlc) { *vlc = dv_vlc_map[run][((uint16_t)l)&0x1ff].vlc; return dv_vlc_map[run][((uint16_t)l)&0x1ff].size; } static always_inline int dv_rl2vlc_size(int run, int l) { return dv_vlc_map[run][((uint16_t)l)&0x1ff].size; } #endif typedef struct EncBlockInfo { int area_q[4]; int bit_size[4]; int prev_run[4]; int cur_ac; int cno; int dct_mode; DCTELEM *mb; uint8_t partial_bit_count; uint32_t partial_bit_buffer; /* we can't use uint16_t here */ } EncBlockInfo; static always_inline int dv_bits_left(PutBitContext* s) { return (s->buf_end - s->buf) * 8 - ((s->buf_ptr - s->buf + s->data_out_size) * 8 + 32 - (int64_t)s->bit_left); } static always_inline void dv_encode_ac(EncBlockInfo* bi, PutBitContext* pb_pool, int pb_size) { int run; int bits_left; PutBitContext* pb = pb_pool; int size = bi->partial_bit_count; uint32_t vlc = bi->partial_bit_buffer; bi->partial_bit_count = bi->partial_bit_buffer = 0; vlc_loop: /* Find suitable storage space */ for (; size > (bits_left = dv_bits_left(pb)); pb++) { if (bits_left) { size -= bits_left; put_bits(pb, bits_left, vlc >> size); vlc = vlc & ((1<partial_bit_count = size; bi->partial_bit_buffer = vlc; return; } --pb_size; } /* Store VLC */ put_bits(pb, size, vlc); /* Construct the next VLC */ run = 0; for (; bi->cur_ac < 64; bi->cur_ac++, run++) { if (bi->mb[bi->cur_ac]) { size = dv_rl2vlc(run, bi->mb[bi->cur_ac], &vlc); bi->cur_ac++; goto vlc_loop; } } if (bi->cur_ac == 64) { size = 4; vlc = 6; /* End Of Block stamp */ bi->cur_ac++; goto vlc_loop; } } static always_inline void dv_set_class_number(DCTELEM* blk, EncBlockInfo* bi, const uint8_t* zigzag_scan, int bias) { int i, area; int run; int classes[] = {12, 24, 36, 0xffff}; run = 0; bi->mb[0] = blk[0]; bi->cno = 0; for (area = 0; area < 4; area++) { bi->prev_run[area] = run; bi->bit_size[area] = 0; for (i=mb_area_start[area]; imb[i] = (blk[zigzag_scan[i]] / 16); while ((bi->mb[i] ^ (bi->mb[i] >> 8)) > classes[bi->cno]) bi->cno++; if (bi->mb[i]) { bi->bit_size[area] += dv_rl2vlc_size(run, bi->mb[i]); run = 0; } else ++run; } } bi->bit_size[3] += 4; /* EOB marker */ bi->cno += bias; if (bi->cno >= 3) { /* FIXME: we have to recreate bit_size[], prev_run[] */ bi->cno = 3; for (i=1; i<64; i++) bi->mb[i] /= 2; } } #define SC(x, y) ((s[x] - s[y]) ^ ((s[x] - s[y]) >> 7)) static always_inline int dv_guess_dct_mode(DCTELEM *blk) { DCTELEM *s; int score88 = 0; int score248 = 0; int i; /* Compute 8-8 score (small values give a better chance for 8-8 DCT) */ s = blk; for(i=0; i<7; i++) { score88 += SC(0, 8) + SC(1, 9) + SC(2, 10) + SC(3, 11) + SC(4, 12) + SC(5,13) + SC(6, 14) + SC(7, 15); s += 8; } /* Compute 2-4-8 score (small values give a better chance for 2-4-8 DCT) */ s = blk; for(i=0; i<6; i++) { score248 += SC(0, 16) + SC(1,17) + SC(2, 18) + SC(3, 19) + SC(4, 20) + SC(5,21) + SC(6, 22) + SC(7, 23); s += 8; } return (score88 - score248 > -10); } static inline void dv_guess_qnos(EncBlockInfo* blks, int* qnos) { int size[5]; int i, j, k, a, run; EncBlockInfo* b; do { b = blks; for (i=0; i<5; i++) { if (!qnos[i]) continue; qnos[i]--; size[i] = 0; for (j=0; j<6; j++, b++) { for (a=0; a<4; a++) { if (b->area_q[a] != dv_quant_shifts[qnos[i] + dv_quant_offset[b->cno]][a]) { b->bit_size[a] = (a==3)?4:0; b->area_q[a]++; run = b->prev_run[a]; for (k=mb_area_start[a]; kmb[k] /= 2; if (b->mb[k]) { b->bit_size[a] += dv_rl2vlc_size(run, b->mb[k]); run = 0; } else ++run; } } size[i] += b->bit_size[a]; } } } } while ((vs_total_ac_bits < size[0] + size[1] + size[2] + size[3] + size[4]) && (qnos[0]|qnos[1]|qnos[2]|qnos[3]|qnos[4])); } /* * This is a very rough initial implementaion. The performance is * horrible and the weighting is missing. But it's missing from the * decoding step also -- so at least we're on the same page with decoder ;-) */ static inline void dv_encode_video_segment(DVVideoDecodeContext *s, uint8_t *dif, const uint16_t *mb_pos_ptr) { int mb_index, i, j, v; int mb_x, mb_y, c_offset, linesize; uint8_t* y_ptr; uint8_t* data; uint8_t* ptr; int do_edge_wrap; DCTELEM block[64] __align8; EncBlockInfo enc_blks[5*6]; PutBitContext pbs[5*6]; PutBitContext* pb; EncBlockInfo* enc_blk; int vs_bit_size = 0; int qnos[5]; enc_blk = &enc_blks[0]; pb = &pbs[0]; for(mb_index = 0; mb_index < 5; mb_index++) { v = *mb_pos_ptr++; mb_x = v & 0xff; mb_y = v >> 8; y_ptr = s->picture.data[0] + (mb_y * s->picture.linesize[0] * 8) + (mb_x * 8); c_offset = (s->sys->pix_fmt == PIX_FMT_YUV411P) ? ((mb_y * s->picture.linesize[1] * 8) + ((mb_x >> 2) * 8)) : (((mb_y >> 1) * s->picture.linesize[1] * 8) + ((mb_x >> 1) * 8)); do_edge_wrap = 0; qnos[mb_index] = 15; /* No quantization */ ptr = dif + mb_index*80 + 4; for(j = 0;j < 6; j++) { if (j < 4) { /* Four Y blocks */ /* NOTE: at end of line, the macroblock is handled as 420 */ if (s->sys->pix_fmt == PIX_FMT_YUV411P && mb_x < (704 / 8)) { data = y_ptr + (j * 8); } else { data = y_ptr + ((j & 1) * 8) + ((j >> 1) * 8 * s->picture.linesize[0]); } linesize = s->picture.linesize[0]; } else { /* Cr and Cb blocks */ /* don't ask Fabrice why they inverted Cb and Cr ! */ data = s->picture.data[6 - j] + c_offset; linesize = s->picture.linesize[6 - j]; if (s->sys->pix_fmt == PIX_FMT_YUV411P && mb_x >= (704 / 8)) do_edge_wrap = 1; } /* Everything is set up -- now just copy data -> DCT block */ if (do_edge_wrap) { /* Edge wrap copy: 4x16 -> 8x8 */ uint8_t* d; DCTELEM *b = block; for (i=0;i<8;i++) { d = data + 8 * linesize; b[0] = data[0]; b[1] = data[1]; b[2] = data[2]; b[3] = data[3]; b[4] = d[0]; b[5] = d[1]; b[6] = d[2]; b[7] = d[3]; data += linesize; b += 8; } } else { /* Simple copy: 8x8 -> 8x8 */ s->get_pixels(block, data, linesize); } enc_blk->dct_mode = dv_guess_dct_mode(block); enc_blk->mb = &s->block[mb_index*6+j][0]; enc_blk->area_q[0] = enc_blk->area_q[1] = enc_blk->area_q[2] = enc_blk->area_q[3] = 0; enc_blk->partial_bit_count = 0; enc_blk->partial_bit_buffer = 0; enc_blk->cur_ac = 1; s->fdct[enc_blk->dct_mode](block); dv_set_class_number(block, enc_blk, enc_blk->dct_mode ? ff_zigzag248_direct : ff_zigzag_direct, j/4*(j%2)); init_put_bits(pb, ptr, block_sizes[j]/8); put_bits(pb, 9, (uint16_t)(((enc_blk->mb[0] >> 3) - 1024) >> 2)); put_bits(pb, 1, enc_blk->dct_mode); put_bits(pb, 2, enc_blk->cno); vs_bit_size += enc_blk->bit_size[0] + enc_blk->bit_size[1] + enc_blk->bit_size[2] + enc_blk->bit_size[3]; ++enc_blk; ++pb; ptr += block_sizes[j]/8; } } if (vs_total_ac_bits < vs_bit_size) dv_guess_qnos(&enc_blks[0], &qnos[0]); for (i=0; i<5; i++) { dif[i*80 + 3] = qnos[i]; } /* First pass over individual cells only */ for (j=0; j<5*6; j++) dv_encode_ac(&enc_blks[j], &pbs[j], 1); /* Second pass over each MB space */ for (j=0; j<5*6; j++) { if (enc_blks[j].cur_ac < 65 || enc_blks[j].partial_bit_count) dv_encode_ac(&enc_blks[j], &pbs[(j/6)*6], 6); } /* Third and final pass over the whole vides segment space */ for (j=0; j<5*6; j++) { if (enc_blks[j].cur_ac < 65 || enc_blks[j].partial_bit_count) dv_encode_ac(&enc_blks[j], &pbs[0], 6*5); } for (j=0; j<5*6; j++) flush_put_bits(&pbs[j]); } /* NOTE: exactly one frame must be given (120000 bytes for NTSC, 144000 bytes for PAL) */ static int dvvideo_decode_frame(AVCodecContext *avctx, void *data, int *data_size, uint8_t *buf, int buf_size) { DVVideoDecodeContext *s = avctx->priv_data; int ds, vs; const uint16_t *mb_pos_ptr; s->sys = dv_frame_profile(buf); if (!s->sys || buf_size < s->sys->frame_size) return -1; /* NOTE: we only accept several full frames */ if(s->picture.data[0]) avctx->release_buffer(avctx, &s->picture); s->picture.reference = 0; avctx->pix_fmt = s->sys->pix_fmt; avctx->width = s->sys->width; avctx->height = s->sys->height; if(avctx->get_buffer(avctx, &s->picture) < 0) { av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n"); return -1; } s->picture.interlaced_frame = 1; s->picture.top_field_first = 0; /* for each DIF segment */ mb_pos_ptr = s->sys->video_place; for (ds = 0; ds < s->sys->difseg_size; ds++) { buf += 6 * 80; /* skip DIF segment header */ for(vs = 0; vs < 27; vs++) { if ((vs % 3) == 0) buf += 80; /* skip audio block */ #ifdef VLC_DEBUG printf("********************* %d, %d **********************\n", ds, vs); #endif dv_decode_video_segment(s, buf, mb_pos_ptr); buf += 5 * 80; mb_pos_ptr += 5; } } emms_c(); /* return image */ *data_size = sizeof(AVFrame); *(AVFrame*)data= s->picture; return s->sys->frame_size; } static int dvvideo_encode_frame(AVCodecContext *c, uint8_t *buf, int buf_size, void *data) { DVVideoDecodeContext *s = c->priv_data; const uint16_t *mb_pos_ptr; int ds, vs; s->sys = dv_codec_profile(c); if (!s->sys) return -1; c->pix_fmt = s->sys->pix_fmt; s->picture = *((AVFrame *)data); /* for each DIF segment */ mb_pos_ptr = s->sys->video_place; for (ds = 0; ds < s->sys->difseg_size; ds++) { buf += 6 * 80; /* skip DIF segment header */ for(vs = 0; vs < 27; vs++) { if ((vs % 3) == 0) buf += 80; /* skip audio block */ #ifdef VLC_DEBUG printf("********************* %d, %d **********************\n", ds, vs); #endif dv_encode_video_segment(s, buf, mb_pos_ptr); buf += 5 * 80; mb_pos_ptr += 5; } } emms_c(); return s->sys->frame_size; } static int dvvideo_end(AVCodecContext *avctx) { avcodec_default_free_buffers(avctx); return 0; } AVCodec dvvideo_decoder = { "dvvideo", CODEC_TYPE_VIDEO, CODEC_ID_DVVIDEO, sizeof(DVVideoDecodeContext), dvvideo_init, dvvideo_encode_frame, dvvideo_end, dvvideo_decode_frame, CODEC_CAP_DR1, NULL };