| /* |
| * 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 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 decoder |
| */ |
| |
| #include "libavutil/avassert.h" |
| #include "libavutil/internal.h" |
| #include "libavutil/pixdesc.h" |
| #include "avcodec.h" |
| #include "internal.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, int16_t *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, int16_t *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; |
| int16_t *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(int16_t, 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-s->avctx->lowres; |
| int is_field_mode[5]; |
| |
| av_assert1((((int)mb_bit_buffer) & 7) == 0); |
| av_assert1((((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 == AV_PIX_FMT_YUV420P) || |
| (s->sys->pix_fmt == AV_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 == AV_PIX_FMT_YUV420P)) * s->picture.linesize[1] + |
| (mb_x >> ((s->sys->pix_fmt == AV_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 == AV_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 << FFMAX(log2_blocksize - 1, 0)); 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 *got_frame, |
| AVPacket *avpkt) |
| { |
| uint8_t *buf = avpkt->data; |
| int buf_size = avpkt->size; |
| DVVideoContext *s = avctx->priv_data; |
| const uint8_t* vsc_pack; |
| int ret, apt, is16_9; |
| |
| s->sys = avpriv_dv_frame_profile2(avctx, 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 */ |
| } |
| |
| 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 ((ret = ff_get_buffer(avctx, &s->picture, 0)) < 0) |
| return ret; |
| s->picture.interlaced_frame = 1; |
| s->picture.top_field_first = 0; |
| |
| /* Determine the codec's sample_aspect ratio and field order from the packet */ |
| vsc_pack = buf + 80*5 + 48 + 5; |
| if ( *vsc_pack == dv_video_control ) { |
| apt = buf[4] & 0x07; |
| is16_9 = (vsc_pack[2] & 0x07) == 0x02 || (!apt && (vsc_pack[2] & 0x07) == 0x07); |
| avctx->sample_aspect_ratio = s->sys->sar[is16_9]; |
| s->picture.top_field_first = !(vsc_pack[3] & 0x40); |
| } |
| |
| 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 */ |
| *got_frame = 1; |
| av_frame_move_ref(data, &s->picture); |
| |
| return s->sys->frame_size; |
| } |
| |
| static int dvvideo_close(AVCodecContext *c) |
| { |
| DVVideoContext *s = c->priv_data; |
| |
| av_frame_unref(&s->picture); |
| |
| return 0; |
| } |
| |
| AVCodec ff_dvvideo_decoder = { |
| .name = "dvvideo", |
| .type = AVMEDIA_TYPE_VIDEO, |
| .id = AV_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, |
| .max_lowres = 3, |
| .long_name = NULL_IF_CONFIG_SMALL("DV (Digital Video)"), |
| }; |