/* * DV decoder * Copyright (c) 2002 Fabrice Bellard * Copyright (c) 2004 Roman Shaposhnik * * DV encoder * Copyright (c) 2003 Roman Shaposhnik * * 50 Mbps (DVCPRO50) support * Copyright (c) 2006 Daniel Maas * * 100 Mbps (DVCPRO HD) support * Initial code by Daniel Maas (funded by BBC R&D) * Final code by Roman Shaposhnik * * Many thanks to Dan Dennedy for providing wealth * of DV technical info. * * 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 * DV codec. */ #include "libavutil/internal.h" #include "libavutil/pixdesc.h" #include "avcodec.h" #include "dv.h" #include "dvdata.h" #include "get_bits.h" #include "internal.h" #include "put_bits.h" #include "simple_idct.h" /* XXX: also include quantization */ RL_VLC_ELEM ff_dv_rl_vlc[1184]; static inline void dv_calc_mb_coordinates(const AVDVProfile *d, int chan, int seq, int slot, uint16_t *tbl) { static const uint8_t off[] = { 2, 6, 8, 0, 4 }; static const uint8_t shuf1[] = { 36, 18, 54, 0, 72 }; static const uint8_t shuf2[] = { 24, 12, 36, 0, 48 }; static const uint8_t shuf3[] = { 18, 9, 27, 0, 36 }; static const uint8_t l_start[] = { 0, 4, 9, 13, 18, 22, 27, 31, 36, 40 }; static const uint8_t l_start_shuffled[] = { 9, 4, 13, 0, 18 }; static const uint8_t serpent1[] = { 0, 1, 2, 2, 1, 0, 0, 1, 2, 2, 1, 0, 0, 1, 2, 2, 1, 0, 0, 1, 2, 2, 1, 0, 0, 1, 2 }; static const uint8_t serpent2[] = { 0, 1, 2, 3, 4, 5, 5, 4, 3, 2, 1, 0, 0, 1, 2, 3, 4, 5, 5, 4, 3, 2, 1, 0, 0, 1, 2, 3, 4, 5 }; static const uint8_t remap[][2] = { { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, /* dummy */ { 0, 0 }, { 0, 1 }, { 0, 2 }, { 0, 3 }, { 10, 0 }, { 10, 1 }, { 10, 2 }, { 10, 3 }, { 20, 0 }, { 20, 1 }, { 20, 2 }, { 20, 3 }, { 30, 0 }, { 30, 1 }, { 30, 2 }, { 30, 3 }, { 40, 0 }, { 40, 1 }, { 40, 2 }, { 40, 3 }, { 50, 0 }, { 50, 1 }, { 50, 2 }, { 50, 3 }, { 60, 0 }, { 60, 1 }, { 60, 2 }, { 60, 3 }, { 70, 0 }, { 70, 1 }, { 70, 2 }, { 70, 3 }, { 0, 64 }, { 0, 65 }, { 0, 66 }, { 10, 64 }, { 10, 65 }, { 10, 66 }, { 20, 64 }, { 20, 65 }, { 20, 66 }, { 30, 64 }, { 30, 65 }, { 30, 66 }, { 40, 64 }, { 40, 65 }, { 40, 66 }, { 50, 64 }, { 50, 65 }, { 50, 66 }, { 60, 64 }, { 60, 65 }, { 60, 66 }, { 70, 64 }, { 70, 65 }, { 70, 66 }, { 0, 67 }, { 20, 67 }, { 40, 67 }, { 60, 67 } }; int i, k, m; int x, y, blk; for (m = 0; m < 5; m++) { switch (d->width) { case 1440: blk = (chan * 11 + seq) * 27 + slot; if (chan == 0 && seq == 11) { x = m * 27 + slot; if (x < 90) { y = 0; } else { x = (x - 90) * 2; y = 67; } } else { i = (4 * chan + blk + off[m]) % 11; k = (blk / 11) % 27; x = shuf1[m] + (chan & 1) * 9 + k % 9; y = (i * 3 + k / 9) * 2 + (chan >> 1) + 1; } tbl[m] = (x << 1) | (y << 9); break; case 1280: blk = (chan * 10 + seq) * 27 + slot; i = (4 * chan + (seq / 5) + 2 * blk + off[m]) % 10; k = (blk / 5) % 27; x = shuf1[m] + (chan & 1) * 9 + k % 9; y = (i * 3 + k / 9) * 2 + (chan >> 1) + 4; if (x >= 80) { x = remap[y][0] + ((x - 80) << (y > 59)); y = remap[y][1]; } tbl[m] = (x << 1) | (y << 9); break; case 960: blk = (chan * 10 + seq) * 27 + slot; i = (4 * chan + (seq / 5) + 2 * blk + off[m]) % 10; k = (blk / 5) % 27 + (i & 1) * 3; x = shuf2[m] + k % 6 + 6 * (chan & 1); y = l_start[i] + k / 6 + 45 * (chan >> 1); tbl[m] = (x << 1) | (y << 9); break; case 720: switch (d->pix_fmt) { case AV_PIX_FMT_YUV422P: x = shuf3[m] + slot / 3; y = serpent1[slot] + ((((seq + off[m]) % d->difseg_size) << 1) + chan) * 3; tbl[m] = (x << 1) | (y << 8); break; case AV_PIX_FMT_YUV420P: x = shuf3[m] + slot / 3; y = serpent1[slot] + ((seq + off[m]) % d->difseg_size) * 3; tbl[m] = (x << 1) | (y << 9); break; case AV_PIX_FMT_YUV411P: i = (seq + off[m]) % d->difseg_size; k = slot + ((m == 1 || m == 2) ? 3 : 0); x = l_start_shuffled[m] + k / 6; y = serpent2[k] + i * 6; if (x > 21) y = y * 2 - i * 6; tbl[m] = (x << 2) | (y << 8); break; } default: break; } } } /* quantization quanta by QNO for DV100 */ static const uint8_t dv100_qstep[16] = { 1, /* QNO = 0 and 1 both have no quantization */ 1, 2, 3, 4, 5, 6, 7, 8, 16, 18, 20, 22, 24, 28, 52 }; static const uint8_t dv_quant_areas[4] = { 6, 21, 43, 64 }; int ff_dv_init_dynamic_tables(DVVideoContext *ctx, const AVDVProfile *d) { int j, i, c, s, p; p = i = 0; for (c = 0; c < d->n_difchan; c++) { for (s = 0; s < d->difseg_size; s++) { p += 6; for (j = 0; j < 27; j++) { p += !(j % 3); if (!(DV_PROFILE_IS_1080i50(d) && c != 0 && s == 11) && !(DV_PROFILE_IS_720p50(d) && s > 9)) { dv_calc_mb_coordinates(d, c, s, j, &ctx->work_chunks[i].mb_coordinates[0]); ctx->work_chunks[i++].buf_offset = p; } p += 5; } } } return 0; } av_cold int ff_dvvideo_init(AVCodecContext *avctx) { DVVideoContext *s = avctx->priv_data; static int done = 0; int i, j; if (!done) { VLC dv_vlc; uint16_t new_dv_vlc_bits[NB_DV_VLC * 2]; uint8_t new_dv_vlc_len[NB_DV_VLC * 2]; uint8_t new_dv_vlc_run[NB_DV_VLC * 2]; int16_t new_dv_vlc_level[NB_DV_VLC * 2]; done = 1; /* it's faster to include sign bit in a generic VLC parsing scheme */ for (i = 0, j = 0; i < NB_DV_VLC; i++, j++) { new_dv_vlc_bits[j] = ff_dv_vlc_bits[i]; new_dv_vlc_len[j] = ff_dv_vlc_len[i]; new_dv_vlc_run[j] = ff_dv_vlc_run[i]; new_dv_vlc_level[j] = ff_dv_vlc_level[i]; if (ff_dv_vlc_level[i]) { new_dv_vlc_bits[j] <<= 1; new_dv_vlc_len[j]++; j++; new_dv_vlc_bits[j] = (ff_dv_vlc_bits[i] << 1) | 1; new_dv_vlc_len[j] = ff_dv_vlc_len[i] + 1; new_dv_vlc_run[j] = ff_dv_vlc_run[i]; new_dv_vlc_level[j] = -ff_dv_vlc_level[i]; } } /* 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, j, new_dv_vlc_len, 1, 1, new_dv_vlc_bits, 2, 2, 0); av_assert1(dv_vlc.table_size == 1184); 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 { run = new_dv_vlc_run[code] + 1; level = new_dv_vlc_level[code]; } ff_dv_rl_vlc[i].len = len; ff_dv_rl_vlc[i].level = level; ff_dv_rl_vlc[i].run = run; } ff_free_vlc(&dv_vlc); } s->avctx = avctx; avctx->chroma_sample_location = AVCHROMA_LOC_TOPLEFT; return 0; }