/* * 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; GetBitContext gb; AVFrame picture; DCTELEM block[5*6][64] __align8; /* FIXME: the following is extracted from DSP */ uint8_t dv_zigzag[2][64]; uint8_t idct_permutation[64]; void (*get_pixels)(DCTELEM *block, const uint8_t *pixels, int line_size); void (*fdct)(DCTELEM *block); /* XXX: move it to static storage ? */ uint8_t dv_shift[2][22][64]; void (*idct_put[2])(uint8_t *dest, int line_size, DCTELEM *block); } DVVideoDecodeContext; #define TEX_VLC_BITS 9 /* XXX: also include quantization */ static RL_VLC_ELEM *dv_rl_vlc[1]; static VLC_TYPE dv_vlc_codes[15][23]; static void dv_build_unquantize_tables(DVVideoDecodeContext *s) { int i, q, j; /* NOTE: max left shift is 6 */ for(q = 0; q < 22; q++) { /* 88 unquant */ for(i = 1; i < 64; i++) { /* 88 table */ j = s->idct_permutation[i]; s->dv_shift[0][q][j] = dv_quant_shifts[q][dv_88_areas[i]] + 1; } /* 248 unquant */ for(i = 1; i < 64; i++) { /* 248 table */ s->dv_shift[1][q][i] = dv_quant_shifts[q][dv_248_areas[i]] + 1; } } } static int dvvideo_init(AVCodecContext *avctx) { DVVideoDecodeContext *s = avctx->priv_data; MpegEncContext s2; static int done=0; if (!done) { int i; VLC dv_vlc; done = 1; /* 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)); 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; } 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; } } /* ugly way to get the idct & scantable */ /* XXX: fix it */ memset(&s2, 0, sizeof(MpegEncContext)); s2.avctx = avctx; dsputil_init(&s2.dsp, avctx); if (DCT_common_init(&s2) < 0) return -1; s->get_pixels = s2.dsp.get_pixels; s->fdct = s2.dsp.fdct; s->idct_put[0] = s2.dsp.idct_put; memcpy(s->idct_permutation, s2.dsp.idct_permutation, 64); memcpy(s->dv_zigzag[0], s2.intra_scantable.permutated, 64); /* XXX: use MMX also for idct248 */ s->idct_put[1] = simple_idct248_put; memcpy(s->dv_zigzag[1], dv_248_zigzag, 64); /* XXX: do it only for constant case */ dv_build_unquantize_tables(s); /* 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 }; #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 fprintf(stderr, "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_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++; } } } /* 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) { int sign = l >> 8; int level = (l ^ sign) - sign; int size; 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; } 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; } else { *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; } } return size; } typedef struct EncBlockInfo { int qno; int cno; int dct_mode; int block_size; DCTELEM *mb; PutBitContext pb; } EncBlockInfo; static inline int dv_bits_left(EncBlockInfo* bi) { return (bi->block_size - get_bit_count(&bi->pb)); } static inline void dv_encode_ac(EncBlockInfo* bi, PutBitContext* heap) { int i, level, size, run = 0; uint32_t vlc; PutBitContext* cpb = &bi->pb; for (i=1; i<64; i++) { level = bi->mb[ff_zigzag_direct[i]] / (1<<(dv_quant_shifts[bi->qno + dv_quant_offset[bi->cno]] [dv_88_areas[ff_zigzag_direct[i]]] + 4 + (bi->cno == 3))); 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< 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); } static inline void dv_set_class_number(EncBlockInfo* bi, int j) { int i, max_ac = 0; for (i=1; i<64; i++) { int ac = abs(bi->mb[ff_zigzag_direct[i]]) / 4; if (max_ac < ac) max_ac = ac; } 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; if (bi->cno > 3) bi->cno = 3; } /* * This is a very rough initial implementaion. The performance is * horrible and some features are missing, mainly 2-4-8 DCT encoding. * The weighting is missing as well, 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; int do_edge_wrap; DCTELEM *block; EncBlockInfo enc_blks[5*6]; 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; /* Stage 1 -- doing DCT on 5 MBs */ block = &s->block[0][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; 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); } s->fdct(block); block += 64; } } /* Stage 2 -- setup for encoding phase */ enc_blk = &enc_blks[0]; block = &s->block[0][0]; for (i=0; i<5; i++) { for (j=0; j<6; j++) { enc_blk->mb = block; enc_blk->dct_mode = 0; enc_blk->block_size = block_sizes[j]; dv_set_class_number(enc_blk, j/4*(j%2)); block += 64; enc_blk++; } } /* Stage 3 -- 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; init_put_bits(&enc_blk->pb, p, block_sizes[j]/8); enc_blk++; p += block_sizes[j]/8; } } 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; 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); #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); } 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 } } /* 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) { fprintf(stderr, "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 };