diff options
-rw-r--r-- | libavcodec/dv.c | 503 | ||||
-rw-r--r-- | libavcodec/dvdata.h | 5 |
2 files changed, 290 insertions, 218 deletions
diff --git a/libavcodec/dv.c b/libavcodec/dv.c index d343c1d3..2754dca 100644 --- a/libavcodec/dv.c +++ b/libavcodec/dv.c @@ -39,7 +39,6 @@ typedef struct DVVideoDecodeContext { uint8_t dv_zigzag[2][64]; uint8_t dv_idct_shift[2][22][64]; - uint8_t dv_dct_shift[2][22][64]; void (*get_pixels)(DCTELEM *block, const uint8_t *pixels, int line_size); void (*fdct[2])(DCTELEM *block); @@ -50,9 +49,22 @@ typedef struct DVVideoDecodeContext { } 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]; -static VLC_TYPE dv_vlc_codes[15][23]; +/* 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) { @@ -66,8 +78,6 @@ static void dv_build_unquantize_tables(DVVideoDecodeContext *s, uint8_t* perm) j = perm[i]; s->dv_idct_shift[0][q][j] = dv_quant_shifts[q][dv_88_areas[i]] + 1; - s->dv_dct_shift[0][q][i] = - dv_quant_shifts[q][dv_88_areas[ff_zigzag_direct[i]]] + 4; } /* 248DCT */ @@ -75,8 +85,6 @@ static void dv_build_unquantize_tables(DVVideoDecodeContext *s, uint8_t* perm) /* 248 table */ s->dv_idct_shift[1][q][i] = dv_quant_shifts[q][dv_248_areas[i]] + 1; - s->dv_dct_shift[1][q][i] = - dv_quant_shifts[q][dv_248_areas[ff_zigzag248_direct[i]]] + 4; } } } @@ -86,7 +94,7 @@ static int dvvideo_init(AVCodecContext *avctx) DVVideoDecodeContext *s = avctx->priv_data; DSPContext dsp; static int done=0; - int i; + int i, j; if (!done) { int i; @@ -94,12 +102,20 @@ static int dvvideo_init(AVCodecContext *avctx) 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]; @@ -121,10 +137,42 @@ static int dvvideo_init(AVCodecContext *avctx) dv_rl_vlc[0][i].run = run; } - memset(dv_vlc_codes, 0xff, sizeof(dv_vlc_codes)); for (i = 0; i < NB_DV_VLC - 1; i++) { - if (dv_vlc_run[i] < 15 && dv_vlc_level[i] < 23 && dv_vlc_len[i] < 15) - dv_vlc_codes[dv_vlc_run[i]][dv_vlc_level[i]] = 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 } } @@ -171,6 +219,10 @@ typedef struct BlockInfo { 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 @@ -517,8 +569,9 @@ static inline void dv_decode_video_segment(DVVideoDecodeContext *s, } } +#ifdef DV_CODEC_TINY_TARGET /* Converts run and level (where level != 0) pair into vlc, returning bit size */ -static inline int dv_rl2vlc(int run, int l, uint32_t* vlc) +static always_inline int dv_rl2vlc(int run, int l, uint32_t* vlc) { int sign = l >> 8; int level = (l ^ sign) - sign; @@ -526,158 +579,216 @@ static inline int dv_rl2vlc(int run, int l, uint32_t* vlc) sign = (sign & 1); - if (run < 15 && level < 23 && dv_vlc_codes[run][level] != -1) { - *vlc = (dv_vlc_bits[dv_vlc_codes[run][level]] << 1) | sign; - size = dv_vlc_len[dv_vlc_codes[run][level]] + 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 < 23) { - *vlc = (dv_vlc_bits[dv_vlc_codes[0][level]] << 1) | sign; - size = dv_vlc_len[dv_vlc_codes[0][level]] + 1; + 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; + *vlc = 0xfe00 | (level << 1) | sign; size = 16; } - - switch(run) { - case 0: - break; - case 1: - case 2: - *vlc |= ((0x7ce | (run - 1)) << size); - size += 11; - break; - case 3: - case 4: - case 5: - case 6: - *vlc |= ((0xfac | (run - 3)) << size); - size += 12; - break; - default: - *vlc |= ((0x1f80 | (run - 1)) << size); - size += 13; - break; + 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 qno; + int area_q[4]; + int bit_size[4]; + int prev_run[4]; + int cur_ac; int cno; int dct_mode; - int block_size; DCTELEM *mb; - PutBitContext pb; - const uint8_t* zigzag_scan; - uint8_t *dv_shift; + uint8_t partial_bit_count; + uint32_t partial_bit_buffer; /* we can't use uint16_t here */ } EncBlockInfo; -static inline int dv_bits_left(EncBlockInfo* bi) +static always_inline int dv_bits_left(PutBitContext* s) { - return (bi->block_size - get_bit_count(&bi->pb)); + return (s->buf_end - s->buf) * 8 - + ((s->buf_ptr - s->buf + s->data_out_size) * 8 + 32 - (int64_t)s->bit_left); } -static inline void dv_encode_ac(EncBlockInfo* bi, PutBitContext* heap) +static always_inline void dv_encode_ac(EncBlockInfo* bi, PutBitContext* pb_pool, + int pb_size) { - int i, level, size, run = 0; - uint32_t vlc; - PutBitContext* cpb = &bi->pb; - int bias = (bi->cno == 3); + int run; + int bits_left; + PutBitContext* pb = pb_pool; + int size = bi->partial_bit_count; + uint32_t vlc = bi->partial_bit_buffer; - for (i=1; i<64; i++) { - level = bi->mb[bi->zigzag_scan[i]] / (1<<(bi->dv_shift[i] + bias)); - if (level != 0) { - size = dv_rl2vlc(run, level, &vlc); -put_vlc: - -#ifdef VLC_DEBUG - printf(" %3d:%3d", run, level); -#endif - if (cpb == &bi->pb && size > dv_bits_left(bi)) { - size -= dv_bits_left(bi); - put_bits(cpb, dv_bits_left(bi), vlc >> size); - vlc = vlc & ((1<<size)-1); - cpb = heap; + 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<<size)-1); + } + if (pb_size == 1) { + bi->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; } - put_bits(cpb, size, vlc); - run = 0; - } else - run++; - } + } - if (i == 64) { - size = 4; vlc = 6; /* End Of Block stamp */ - goto put_vlc; - } -} - -static inline void dv_redistr_bits(EncBlockInfo* bi, int count, uint8_t* extra_data, int extra_bits, PutBitContext* heap) -{ - int i; - GetBitContext gb; - - init_get_bits(&gb, extra_data, extra_bits); - - for (i=0; i<count; i++) { - int bits_left = dv_bits_left(bi); -#ifdef VLC_DEBUG - if (bits_left) - printf("------------> inserting %d bytes in %d:%d\n", bits_left, i/6, i%6); -#endif - if (bits_left > extra_bits) { - bit_copy(&bi->pb, &gb, extra_bits); - extra_bits = 0; - break; - } else - bit_copy(&bi->pb, &gb, bits_left); - - extra_bits -= bits_left; - bi++; - } - - if (extra_bits > 0 && heap) - bit_copy(heap, &gb, extra_bits); + if (bi->cur_ac == 64) { + size = 4; vlc = 6; /* End Of Block stamp */ + bi->cur_ac++; + goto vlc_loop; + } } -static inline void dv_set_class_number(EncBlockInfo* bi, int j) +static always_inline void dv_set_class_number(DCTELEM* blk, EncBlockInfo* bi, + const uint8_t* zigzag_scan, int bias) { - int i, max_ac = 0; + int i, area; + int run; + int classes[] = {12, 24, 36, 0xffff}; - for (i=1; i<64; i++) { - int ac = abs(bi->mb[ff_zigzag_direct[i]]) / 4; - if (max_ac < ac) - max_ac = ac; + 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]; i<mb_area_start[area+1]; i++) { + bi->mb[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; + } } - if (max_ac < 12) - bi->cno = j; - else if (max_ac < 24) - bi->cno = j + 1; - else if (max_ac < 36) - bi->cno = j + 2; - else - bi->cno = j + 3; + bi->bit_size[3] += 4; /* EOB marker */ + bi->cno += bias; - if (bi->cno > 3) + 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 SQ(a) ((a)*(a)) -static int dv_score_lines(DCTELEM *s, int stride) { - int score=0; - int x, y; +#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; - for(y=0; y<4; y++) { - for(x=0; x<8; x+=4){ - score+= SQ(s[x ] - s[x +stride]) + SQ(s[x+1] - s[x+1+stride]) - +SQ(s[x+2] - s[x+2+stride]) + SQ(s[x+3] - s[x+3+stride]); - } - s+= stride; + /* 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; - return score; + 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]; k<mb_area_start[a+1]; k++) { + b->mb[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])); } /* @@ -693,21 +804,18 @@ static inline void dv_encode_video_segment(DVVideoDecodeContext *s, int mb_x, mb_y, c_offset, linesize; uint8_t* y_ptr; uint8_t* data; + uint8_t* ptr; int do_edge_wrap; - DCTELEM *block; + DCTELEM block[64] __align8; EncBlockInfo enc_blks[5*6]; + PutBitContext pbs[5*6]; + PutBitContext* pb; EncBlockInfo* enc_blk; - int free_vs_bits; - int extra_bits; - PutBitContext extra_vs; - uint8_t extra_vs_data[5*6*128]; - uint8_t extra_mb_data[6*128]; - - int QNO = 15; + int vs_bit_size = 0; + int qnos[5]; - /* Stage 1 -- doing DCT on 5 MBs */ - block = &s->block[0][0]; 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; @@ -717,6 +825,8 @@ static inline void dv_encode_video_segment(DVVideoDecodeContext *s, ((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 */ @@ -749,100 +859,57 @@ static inline void dv_encode_video_segment(DVVideoDecodeContext *s, s->get_pixels(block, data, linesize); } - if (dv_score_lines(block, 8) + dv_score_lines(block+8*4, 8) - 100 > - dv_score_lines(block, 16) + dv_score_lines(block+8, 16)) { - enc_blk->dct_mode = 1; - enc_blk->zigzag_scan = ff_zigzag248_direct; - } else { - enc_blk->dct_mode = 0; - enc_blk->zigzag_scan = ff_zigzag_direct; - } - enc_blk->mb = block; - enc_blk->block_size = block_sizes[j]; + 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(enc_blk, j/4*(j%2)); - - block += 64; - enc_blk++; + 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; } } - /* Stage 2 -- encoding by trial-and-error */ -encode_vs: - enc_blk = &enc_blks[0]; - for (i=0; i<5; i++) { - uint8_t* p = dif + i*80 + 4; - for (j=0; j<6; j++) { - enc_blk->qno = QNO; - enc_blk->dv_shift = &(s->dv_dct_shift[0] - [QNO + dv_quant_offset[enc_blk->cno]][0]); - init_put_bits(&enc_blk->pb, p, block_sizes[j]/8); - enc_blk++; - p += block_sizes[j]/8; - } - } + if (vs_total_ac_bits < vs_bit_size) + dv_guess_qnos(&enc_blks[0], &qnos[0]); - init_put_bits(&extra_vs, extra_vs_data, sizeof(extra_vs_data)); - free_vs_bits = 0; - enc_blk = &enc_blks[0]; for (i=0; i<5; i++) { - PutBitContext extra_mb; - EncBlockInfo* enc_blk2 = enc_blk; - int free_mb_bits = 0; - - init_put_bits(&extra_mb, extra_mb_data, sizeof(extra_mb_data)); - dif[i*80 + 3] = enc_blk->qno; - - for (j=0; j<6; j++) { - uint16_t dc = ((enc_blk->mb[0] >> 3) - 1024) >> 2; + dif[i*80 + 3] = qnos[i]; + } - put_bits(&enc_blk->pb, 9, dc); - put_bits(&enc_blk->pb, 1, enc_blk->dct_mode); - put_bits(&enc_blk->pb, 2, enc_blk->cno); + /* First pass over individual cells only */ + for (j=0; j<5*6; j++) + dv_encode_ac(&enc_blks[j], &pbs[j], 1); -#ifdef VLC_DEBUG - printf("[%d, %d]: ", i, j); -#endif - dv_encode_ac(enc_blk, &extra_mb); -#ifdef VLC_DEBUG - printf("\n"); -#endif - - free_mb_bits += dv_bits_left(enc_blk); - enc_blk++; - } - - /* We can't flush extra_mb just yet -- since it'll round up bit number */ - extra_bits = get_bit_count(&extra_mb); - if (free_mb_bits > extra_bits) - free_vs_bits += free_mb_bits - extra_bits; - - if (extra_bits) { /* FIXME: speed up things when free_mb_bits == 0 */ - flush_put_bits(&extra_mb); - dv_redistr_bits(enc_blk2, 6, extra_mb_data, extra_bits, &extra_vs); - } - } - - /* We can't flush extra_mb just yet -- since it'll round up bit number */ - extra_bits = get_bit_count(&extra_vs); - if (extra_bits > free_vs_bits && QNO) { /* FIXME: very crude trial-and-error */ - QNO--; - goto encode_vs; - } - - if (extra_bits) { - flush_put_bits(&extra_vs); - dv_redistr_bits(&enc_blks[0], 5*6, extra_vs_data, extra_bits, NULL); + /* 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); } - for (i=0; i<6*5; i++) { - flush_put_bits(&enc_blks[i].pb); -#ifdef VLC_DEBUG - printf("[%d:%d] qno=%d cno=%d\n", i/6, i%6, enc_blks[i].qno, enc_blks[i].cno); -#endif + /* 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, diff --git a/libavcodec/dvdata.h b/libavcodec/dvdata.h index 57a7e20..e6e0986 100644 --- a/libavcodec/dvdata.h +++ b/libavcodec/dvdata.h @@ -51,6 +51,11 @@ typedef struct DVprofile { #define NB_DV_VLC 409 +/* + * There's a catch about the following three tables: the mapping they establish + * between (run, level) and vlc is not 1-1. So you have to watch out for that + * when building misc. tables. E.g. (1, 0) can be either 0x7cf or 0x1f82. + */ static const uint16_t dv_vlc_bits[409] = { 0x0000, 0x0002, 0x0007, 0x0008, 0x0009, 0x0014, 0x0015, 0x0016, 0x0017, 0x0030, 0x0031, 0x0032, 0x0033, 0x0068, 0x0069, 0x006a, |