/* * DV decoder * Copyright (c) 2002 Fabrice Bellard * Copyright (c) 2004 Roman Shaposhnik * * 50 Mbps (DVCPRO50) support * Copyright (c) 2006 Daniel Maas <dmaas@maasdigital.com> * * 100 Mbps (DVCPRO HD) support * Initial code by Daniel Maas <dmaas@maasdigital.com> (funded by BBC R&D) * Final code by Roman Shaposhnik * * Many thanks to Dan Dennedy <dan@dennedy.org> for providing wealth * of DV technical info. * * This file is part of Libav. * * Libav 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. * * Libav 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 Libav; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ /** * @file * DV decoder */ #include "libavutil/pixdesc.h" #include "avcodec.h" #include "dsputil.h" #include "get_bits.h" #include "put_bits.h" #include "simple_idct.h" #include "dvdata.h" typedef struct BlockInfo { const uint32_t *factor_table; const uint8_t *scan_table; uint8_t pos; /* position in block */ void (*idct_put)(uint8_t *dest, int line_size, DCTELEM *block); uint8_t partial_bit_count; uint32_t partial_bit_buffer; int shift_offset; } BlockInfo; static const int dv_iweight_bits = 14; /* decode AC coefficients */ static void dv_decode_ac(GetBitContext *gb, BlockInfo *mb, DCTELEM *block) { int last_index = gb->size_in_bits; const uint8_t *scan_table = mb->scan_table; const uint32_t *factor_table = mb->factor_table; int pos = mb->pos; int partial_bit_count = mb->partial_bit_count; int level, run, vlc_len, index; OPEN_READER(re, gb); UPDATE_CACHE(re, gb); /* if we must parse a partial VLC, we do it here */ if (partial_bit_count > 0) { re_cache = re_cache >> partial_bit_count | mb->partial_bit_buffer; re_index -= partial_bit_count; mb->partial_bit_count = 0; } /* get the AC coefficients until last_index is reached */ for (;;) { av_dlog(NULL, "%2d: bits=%04x index=%d\n", pos, SHOW_UBITS(re, gb, 16), re_index); /* our own optimized GET_RL_VLC */ index = NEG_USR32(re_cache, TEX_VLC_BITS); vlc_len = ff_dv_rl_vlc[index].len; if (vlc_len < 0) { index = NEG_USR32((unsigned)re_cache << TEX_VLC_BITS, -vlc_len) + ff_dv_rl_vlc[index].level; vlc_len = TEX_VLC_BITS - vlc_len; } level = ff_dv_rl_vlc[index].level; run = ff_dv_rl_vlc[index].run; /* gotta check if we're still within gb boundaries */ if (re_index + vlc_len > last_index) { /* should be < 16 bits otherwise a codeword could have been parsed */ mb->partial_bit_count = last_index - re_index; mb->partial_bit_buffer = re_cache & ~(-1u >> mb->partial_bit_count); re_index = last_index; break; } re_index += vlc_len; av_dlog(NULL, "run=%d level=%d\n", run, level); pos += run; if (pos >= 64) break; level = (level * factor_table[pos] + (1 << (dv_iweight_bits - 1))) >> dv_iweight_bits; block[scan_table[pos]] = level; UPDATE_CACHE(re, gb); } CLOSE_READER(re, gb); mb->pos = pos; } static inline void bit_copy(PutBitContext *pb, GetBitContext *gb) { int bits_left = get_bits_left(gb); while (bits_left >= MIN_CACHE_BITS) { put_bits(pb, MIN_CACHE_BITS, get_bits(gb, MIN_CACHE_BITS)); bits_left -= MIN_CACHE_BITS; } 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 int dv_decode_video_segment(AVCodecContext *avctx, void *arg) { DVVideoContext *s = avctx->priv_data; DVwork_chunk *work_chunk = arg; int quant, dc, dct_mode, class1, j; int mb_index, mb_x, mb_y, last_index; int y_stride, linesize; DCTELEM *block, *block1; int c_offset; uint8_t *y_ptr; const uint8_t *buf_ptr; PutBitContext pb, vs_pb; GetBitContext gb; BlockInfo mb_data[5 * DV_MAX_BPM], *mb, *mb1; LOCAL_ALIGNED_16(DCTELEM, sblock, [5*DV_MAX_BPM], [64]); LOCAL_ALIGNED_16(uint8_t, mb_bit_buffer, [ 80 + FF_INPUT_BUFFER_PADDING_SIZE]); /* allow some slack */ LOCAL_ALIGNED_16(uint8_t, vs_bit_buffer, [5*80 + FF_INPUT_BUFFER_PADDING_SIZE]); /* allow some slack */ const int log2_blocksize = 3; int is_field_mode[5]; assert((((int)mb_bit_buffer) & 7) == 0); assert((((int)vs_bit_buffer) & 7) == 0); memset(sblock, 0, 5*DV_MAX_BPM*sizeof(*sblock)); /* pass 1: read DC and AC coefficients in blocks */ buf_ptr = &s->buf[work_chunk->buf_offset*80]; block1 = &sblock[0][0]; mb1 = mb_data; init_put_bits(&vs_pb, vs_bit_buffer, 5 * 80); for (mb_index = 0; mb_index < 5; mb_index++, mb1 += s->sys->bpm, block1 += s->sys->bpm * 64) { /* skip header */ quant = buf_ptr[3] & 0x0f; buf_ptr += 4; init_put_bits(&pb, mb_bit_buffer, 80); mb = mb1; block = block1; is_field_mode[mb_index] = 0; for (j = 0; j < s->sys->bpm; j++) { last_index = s->sys->block_sizes[j]; init_get_bits(&gb, buf_ptr, last_index); /* get the DC */ dc = get_sbits(&gb, 9); dct_mode = get_bits1(&gb); class1 = get_bits(&gb, 2); if (DV_PROFILE_IS_HD(s->sys)) { mb->idct_put = s->idct_put[0]; mb->scan_table = s->dv_zigzag[0]; mb->factor_table = &s->sys->idct_factor[(j >= 4)*4*16*64 + class1*16*64 + quant*64]; is_field_mode[mb_index] |= !j && dct_mode; } else { mb->idct_put = s->idct_put[dct_mode && log2_blocksize == 3]; mb->scan_table = s->dv_zigzag[dct_mode]; mb->factor_table = &s->sys->idct_factor[(class1 == 3)*2*22*64 + dct_mode*22*64 + (quant + ff_dv_quant_offset[class1])*64]; } dc = dc << 2; /* convert to unsigned because 128 is not added in the standard IDCT */ dc += 1024; block[0] = dc; buf_ptr += last_index >> 3; mb->pos = 0; mb->partial_bit_count = 0; av_dlog(avctx, "MB block: %d, %d ", mb_index, j); dv_decode_ac(&gb, mb, block); /* write the remaining bits in a new buffer only if the block is finished */ if (mb->pos >= 64) bit_copy(&pb, &gb); block += 64; mb++; } /* pass 2: we can do it just after */ av_dlog(avctx, "***pass 2 size=%d MB#=%d\n", put_bits_count(&pb), mb_index); block = block1; mb = mb1; init_get_bits(&gb, mb_bit_buffer, put_bits_count(&pb)); put_bits32(&pb, 0); // padding must be zeroed flush_put_bits(&pb); for (j = 0; j < s->sys->bpm; j++, block += 64, mb++) { if (mb->pos < 64 && get_bits_left(&gb) > 0) { dv_decode_ac(&gb, mb, block); /* if still not finished, no need to parse other blocks */ if (mb->pos < 64) break; } } /* all blocks are finished, so the extra bytes can be used at the video segment level */ if (j >= s->sys->bpm) bit_copy(&vs_pb, &gb); } /* we need a pass over the whole video segment */ av_dlog(avctx, "***pass 3 size=%d\n", put_bits_count(&vs_pb)); block = &sblock[0][0]; mb = mb_data; init_get_bits(&gb, vs_bit_buffer, put_bits_count(&vs_pb)); put_bits32(&vs_pb, 0); // padding must be zeroed flush_put_bits(&vs_pb); for (mb_index = 0; mb_index < 5; mb_index++) { for (j = 0; j < s->sys->bpm; j++) { if (mb->pos < 64) { av_dlog(avctx, "start %d:%d\n", mb_index, j); dv_decode_ac(&gb, mb, block); } if (mb->pos >= 64 && mb->pos < 127) av_log(avctx, AV_LOG_ERROR, "AC EOB marker is absent pos=%d\n", mb->pos); block += 64; mb++; } } /* compute idct and place blocks */ block = &sblock[0][0]; mb = mb_data; for (mb_index = 0; mb_index < 5; mb_index++) { dv_calculate_mb_xy(s, work_chunk, mb_index, &mb_x, &mb_y); /* idct_put'ting luminance */ if ((s->sys->pix_fmt == PIX_FMT_YUV420P) || (s->sys->pix_fmt == PIX_FMT_YUV411P && mb_x >= (704 / 8)) || (s->sys->height >= 720 && mb_y != 134)) { y_stride = (s->picture.linesize[0] << ((!is_field_mode[mb_index]) * log2_blocksize)); } else { y_stride = (2 << log2_blocksize); } y_ptr = s->picture.data[0] + ((mb_y * s->picture.linesize[0] + mb_x) << log2_blocksize); linesize = s->picture.linesize[0] << is_field_mode[mb_index]; mb[0] .idct_put(y_ptr , linesize, block + 0*64); if (s->sys->video_stype == 4) { /* SD 422 */ mb[2].idct_put(y_ptr + (1 << log2_blocksize) , linesize, block + 2*64); } else { mb[1].idct_put(y_ptr + (1 << log2_blocksize) , linesize, block + 1*64); mb[2].idct_put(y_ptr + y_stride, linesize, block + 2*64); mb[3].idct_put(y_ptr + (1 << log2_blocksize) + y_stride, linesize, block + 3*64); } mb += 4; block += 4*64; /* idct_put'ting chrominance */ c_offset = (((mb_y >> (s->sys->pix_fmt == PIX_FMT_YUV420P)) * s->picture.linesize[1] + (mb_x >> ((s->sys->pix_fmt == PIX_FMT_YUV411P) ? 2 : 1))) << log2_blocksize); for (j = 2; j; j--) { uint8_t *c_ptr = s->picture.data[j] + c_offset; 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_ptr1, *ptr1; int x, y; mb->idct_put(pixels, 8, block); for (y = 0; y < (1 << log2_blocksize); y++, c_ptr += s->picture.linesize[j], pixels += 8) { ptr1 = pixels + (1 << (log2_blocksize - 1)); c_ptr1 = c_ptr + (s->picture.linesize[j] << log2_blocksize); for (x = 0; x < (1 << (log2_blocksize - 1)); x++) { c_ptr[x] = pixels[x]; c_ptr1[x] = ptr1[x]; } } block += 64; mb++; } else { y_stride = (mb_y == 134) ? (1 << log2_blocksize) : s->picture.linesize[j] << ((!is_field_mode[mb_index]) * log2_blocksize); linesize = s->picture.linesize[j] << is_field_mode[mb_index]; (mb++)-> idct_put(c_ptr , linesize, block); block += 64; if (s->sys->bpm == 8) { (mb++)->idct_put(c_ptr + y_stride, linesize, block); block += 64; } } } } return 0; } /* NOTE: exactly one frame must be given (120000 bytes for NTSC, 144000 bytes for PAL - or twice those for 50Mbps) */ static int dvvideo_decode_frame(AVCodecContext *avctx, void *data, int *data_size, AVPacket *avpkt) { uint8_t *buf = avpkt->data; int buf_size = avpkt->size; DVVideoContext *s = avctx->priv_data; const uint8_t* vsc_pack; int apt, is16_9; s->sys = avpriv_dv_frame_profile(s->sys, buf, buf_size); if (!s->sys || buf_size < s->sys->frame_size || ff_dv_init_dynamic_tables(s->sys)) { av_log(avctx, AV_LOG_ERROR, "could not find dv frame profile\n"); return -1; /* NOTE: we only accept several full frames */ } if (s->picture.data[0]) avctx->release_buffer(avctx, &s->picture); s->picture.reference = 0; s->picture.key_frame = 1; s->picture.pict_type = AV_PICTURE_TYPE_I; avctx->pix_fmt = s->sys->pix_fmt; avctx->time_base = s->sys->time_base; avcodec_set_dimensions(avctx, s->sys->width, 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; s->buf = buf; avctx->execute(avctx, dv_decode_video_segment, s->sys->work_chunks, NULL, dv_work_pool_size(s->sys), sizeof(DVwork_chunk)); emms_c(); /* return image */ *data_size = sizeof(AVFrame); *(AVFrame*)data = s->picture; /* Determine the codec's sample_aspect ratio from the packet */ vsc_pack = buf + 80*5 + 48 + 5; if ( *vsc_pack == dv_video_control ) { apt = buf[4] & 0x07; is16_9 = (vsc_pack && ((vsc_pack[2] & 0x07) == 0x02 || (!apt && (vsc_pack[2] & 0x07) == 0x07))); avctx->sample_aspect_ratio = s->sys->sar[is16_9]; } return s->sys->frame_size; } static int dvvideo_close(AVCodecContext *c) { DVVideoContext *s = c->priv_data; if (s->picture.data[0]) c->release_buffer(c, &s->picture); return 0; } AVCodec ff_dvvideo_decoder = { .name = "dvvideo", .type = AVMEDIA_TYPE_VIDEO, .id = CODEC_ID_DVVIDEO, .priv_data_size = sizeof(DVVideoContext), .init = ff_dvvideo_init, .close = dvvideo_close, .decode = dvvideo_decode_frame, .capabilities = CODEC_CAP_DR1 | CODEC_CAP_SLICE_THREADS, .long_name = NULL_IF_CONFIG_SMALL("DV (Digital Video)"), };