2022-10-14 02:19:39 +00:00
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/*
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* LEAD MCMP decoder
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*
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* Copyright (c) 2023 Peter Ross
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "avcodec.h"
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#include "blockdsp.h"
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#include "codec_internal.h"
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#include "copy_block.h"
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#include "decode.h"
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#include "get_bits.h"
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#include "idctdsp.h"
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#include "jpegquanttables.h"
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#include "jpegtables.h"
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#include "leaddata.h"
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#include "libavutil/mem_internal.h"
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#include "libavutil/thread.h"
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#define LUMA_DC_BITS 9
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#define CHROMA_DC_BITS 11
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#define LUMA_AC_BITS 10
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#define CHROMA_AC_BITS 10
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static VLC luma_dc_vlc;
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static VLC chroma_dc_vlc;
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static VLC luma_ac_vlc;
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static VLC chroma_ac_vlc;
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static av_cold void lead_init_static_data(void)
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{
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VLC_INIT_STATIC_FROM_LENGTHS(&luma_dc_vlc, LUMA_DC_BITS, FF_ARRAY_ELEMS(luma_dc_len),
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luma_dc_len, 1,
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0, 0, 0,
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0, 0, 1 << LUMA_DC_BITS);
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VLC_INIT_STATIC_FROM_LENGTHS(&chroma_dc_vlc, CHROMA_DC_BITS, FF_ARRAY_ELEMS(chroma_dc_len),
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chroma_dc_len, 1,
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0, 0, 0,
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0, 0, 1 << CHROMA_DC_BITS);
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VLC_INIT_STATIC_FROM_LENGTHS(&luma_ac_vlc, LUMA_AC_BITS, FF_ARRAY_ELEMS(luma_ac_len),
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luma_ac_len, 1,
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ff_mjpeg_val_ac_luminance, 1, 1,
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0, 0, 1160);
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VLC_INIT_STATIC_FROM_LENGTHS(&chroma_ac_vlc, CHROMA_AC_BITS, FF_ARRAY_ELEMS(chroma_ac_len),
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chroma_ac_len, 1,
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ff_mjpeg_val_ac_chrominance, 1, 1,
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0, 0, 1160);
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}
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typedef struct LeadContext {
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uint8_t *bitstream_buf;
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unsigned int bitstream_buf_size;
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BlockDSPContext bdsp;
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IDCTDSPContext idsp;
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uint8_t permutated_scantable[64];
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} LeadContext;
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static av_cold int lead_decode_init(AVCodecContext * avctx)
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{
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static AVOnce init_static_once = AV_ONCE_INIT;
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LeadContext *s = avctx->priv_data;
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if (avctx->extradata_size < 20)
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return AVERROR_INVALIDDATA;
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ff_blockdsp_init(&s->bdsp);
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ff_idctdsp_init(&s->idsp, avctx);
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ff_permute_scantable(s->permutated_scantable, ff_zigzag_direct, s->idsp.idct_permutation);
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ff_thread_once(&init_static_once, lead_init_static_data);
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return 0;
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}
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static void calc_dequant(uint16_t * dequant, const uint8_t * quant_tbl, int q)
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{
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for (int i = 0; i < 64; i++)
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dequant[i] = av_clip(q * quant_tbl[ff_zigzag_direct[i]] / 50, 2, 32767);
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}
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static int decode_block(LeadContext * s, GetBitContext * gb,
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const VLCElem * dc_table, int dc_bits, const VLCElem * ac_table, int ac_bits,
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int16_t * dc_pred, const uint16_t * dequant,
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uint8_t * dst, int stride)
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{
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DECLARE_ALIGNED(32, int16_t, block)[64];
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int size;
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s->bdsp.clear_block(block);
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2023-12-15 01:18:04 +00:00
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if (get_bits_left(gb) <= 0)
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return AVERROR_INVALIDDATA;
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2022-10-14 02:19:39 +00:00
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size = get_vlc2(gb, dc_table, dc_bits, 1);
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if (size < 0)
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return AVERROR_INVALIDDATA;
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if (size)
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*dc_pred += get_xbits(gb, size);
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block[0] = (1 << 10) + *dc_pred * dequant[0];
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for (int i = 1; i < 64; i++) {
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int symbol = get_vlc2(gb, ac_table, ac_bits, 2);
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if (symbol < 0)
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return AVERROR_INVALIDDATA;
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if (!symbol)
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break;
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i += symbol >> 4;
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if (i >= 64)
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return AVERROR_INVALIDDATA;
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size = symbol & 0xF;
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if (size)
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block[s->permutated_scantable[i]] = get_xbits(gb, size) * dequant[i];
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}
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s->idsp.idct_put(dst, stride, block);
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return 0;
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}
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static int lead_decode_frame(AVCodecContext *avctx, AVFrame * frame,
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int * got_frame, AVPacket * avpkt)
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{
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LeadContext *s = avctx->priv_data;
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const uint8_t * buf = avpkt->data;
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int ret, format, yuv20p_half = 0, fields = 1, q, size;
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GetBitContext gb;
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int16_t dc_pred[3] = {0, 0, 0};
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uint16_t dequant[2][64];
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if (avpkt->size < 8)
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return AVERROR_INVALIDDATA;
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format = AV_RL16(buf + 4);
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switch(format) {
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case 0x8000:
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yuv20p_half = 1;
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// fall-through
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case 0x1000:
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avctx->pix_fmt = AV_PIX_FMT_YUV420P;
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break;
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case 0x2000:
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avctx->pix_fmt = AV_PIX_FMT_YUV444P;
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break;
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case 0x2006:
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avctx->pix_fmt = AV_PIX_FMT_YUV444P;
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fields = 2;
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break;
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default:
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avpriv_request_sample(avctx, "unsupported format 0x%x", format);
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return AVERROR_PATCHWELCOME;
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}
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q = AV_RL16(buf + 6);
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calc_dequant(dequant[0], ff_mjpeg_std_luminance_quant_tbl, q);
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calc_dequant(dequant[1], ff_mjpeg_std_chrominance_quant_tbl, q);
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if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
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return ret;
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frame->flags |= AV_FRAME_FLAG_KEY;
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frame->pict_type = AV_PICTURE_TYPE_I;
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av_fast_padded_malloc(&s->bitstream_buf, &s->bitstream_buf_size, avpkt->size - 8);
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if (!s->bitstream_buf)
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return AVERROR(ENOMEM);
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size = 0;
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for (int i = 8; i < avpkt->size; i++) {
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int src = buf[i] ^ 0x80;
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s->bitstream_buf[size++] = src;
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if (src == 0xFF && i + 1 < avpkt->size && (buf[i + 1] ^ 0x80) == 0x00)
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i++;
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}
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init_get_bits8(&gb, s->bitstream_buf, size);
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if (avctx->pix_fmt == AV_PIX_FMT_YUV420P) {
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for (int mb_y = 0; mb_y < avctx->height / 16; mb_y++)
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for (int mb_x = 0; mb_x < avctx->width / 16; mb_x++)
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for (int b = 0; b < (yuv20p_half ? 4 : 6); b++) {
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int luma_block = yuv20p_half ? 2 : 4;
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const VLCElem * dc_vlc = b < luma_block ? luma_dc_vlc.table : chroma_dc_vlc.table;
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int dc_bits = b < luma_block ? LUMA_DC_BITS : CHROMA_DC_BITS;
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const VLCElem * ac_vlc = b < luma_block ? luma_ac_vlc.table : chroma_ac_vlc.table;
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int ac_bits = b < luma_block ? LUMA_AC_BITS : CHROMA_AC_BITS;
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int plane = b < luma_block ? 0 : b - (yuv20p_half ? 1 : 3);
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int x, y;
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if (b < luma_block) {
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y = 16*mb_y + 8*(b >> 1);
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x = 16*mb_x + 8*(b & 1);
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} else {
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y = 8*mb_y;
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x = 8*mb_x;
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}
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ret = decode_block(s, &gb, dc_vlc, dc_bits, ac_vlc, ac_bits,
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dc_pred + plane, dequant[!(b < 4)],
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frame->data[plane] + y*frame->linesize[plane] + x,
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(yuv20p_half && b < 2 ? 2 : 1) * frame->linesize[plane]);
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if (ret < 0)
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return ret;
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if (yuv20p_half && b < 2)
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copy_block8(frame->data[plane] + (y + 1)*frame->linesize[plane] + x,
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frame->data[plane] + y*frame->linesize[plane] + x,
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2*frame->linesize[plane], 2*frame->linesize[plane], 8);
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}
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} else {
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for (int f = 0; f < fields; f++)
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for (int j = 0; j < avctx->height / fields / 8; j++)
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for (int i = 0; i < avctx->width / 8; i++)
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for (int plane = 0; plane < 3; plane++) {
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const VLCElem * dc_vlc = !plane ? luma_dc_vlc.table : chroma_dc_vlc.table;
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int dc_bits = !plane ? LUMA_DC_BITS : CHROMA_DC_BITS;
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const VLCElem * ac_vlc = !plane ? luma_ac_vlc.table : chroma_ac_vlc.table;
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int ac_bits = !plane ? LUMA_AC_BITS : CHROMA_AC_BITS;
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ret = decode_block(s, &gb, dc_vlc, dc_bits, ac_vlc, ac_bits,
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dc_pred + plane, dequant[!!plane],
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frame->data[plane] + (f + 8*j*fields)*frame->linesize[plane] + 8*i,
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fields * frame->linesize[plane]);
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if (ret < 0)
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return ret;
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}
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}
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*got_frame = 1;
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return avpkt->size;
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}
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static av_cold int lead_decode_end(AVCodecContext * avctx)
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{
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LeadContext *s = avctx->priv_data;
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av_freep(&s->bitstream_buf);
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return 0;
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}
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const FFCodec ff_lead_decoder = {
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.p.name = "lead",
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CODEC_LONG_NAME("LEAD MCMP"),
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.p.type = AVMEDIA_TYPE_VIDEO,
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.p.id = AV_CODEC_ID_LEAD,
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.priv_data_size = sizeof(LeadContext),
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.init = lead_decode_init,
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.close = lead_decode_end,
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FF_CODEC_DECODE_CB(lead_decode_frame),
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.p.capabilities = AV_CODEC_CAP_DR1,
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.caps_internal = FF_CODEC_CAP_INIT_CLEANUP,
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};
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