FFmpeg coverage

Directory:	../../../ffmpeg/
File:	src/libavcodec/leaddec.c
Date:	2025-03-08 20:38:41

	Total	Coverage
Lines:	165	0.0%
Functions:	6	0.0%
Branches:	123	0.0%

  
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      /*
    
       * LEAD MCMP decoder
    
       *
    
       * Copyright (c) 2023 Peter Ross
    
       *
    
       * 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
    
       */
    
      #include "avcodec.h"
    
      #include "blockdsp.h"
    
      #include "codec_internal.h"
    
      #include "copy_block.h"
    
      #include "decode.h"
    
      #include "get_bits.h"
    
      #include "idctdsp.h"
    
      #include "jpegquanttables.h"
    
      #include "jpegtables.h"
    
      #include "leaddata.h"
    
      #include "libavutil/mem.h"
    
      #include "libavutil/mem_internal.h"
    
      #include "libavutil/thread.h"
    
      #define LUMA_DC_BITS 9
    
      #define CHROMA_DC_BITS 11
    
      #define LUMA_AC_BITS 10
    
      #define CHROMA_AC_BITS 10
    
      static VLCElem luma_dc_vlc[1 << LUMA_DC_BITS];
    
      static VLCElem chroma_dc_vlc[1 << CHROMA_DC_BITS];
    
      static VLCElem luma_ac_vlc[1160];
    
      static VLCElem chroma_ac_vlc[1160];
    
      ✗
      static av_cold void lead_init_static_data(void)
    
      {
    
      ✗
          VLC_INIT_STATIC_TABLE_FROM_LENGTHS(luma_dc_vlc, LUMA_DC_BITS, FF_ARRAY_ELEMS(luma_dc_len),
    
                                             luma_dc_len, 1,
    
                                             NULL, 0, 0,
    
                                             0, 0);
    
      ✗
          VLC_INIT_STATIC_TABLE_FROM_LENGTHS(chroma_dc_vlc, CHROMA_DC_BITS, FF_ARRAY_ELEMS(chroma_dc_len),
    
                                             chroma_dc_len, 1,
    
                                             NULL, 0, 0,
    
                                             0, 0);
    
      ✗
          VLC_INIT_STATIC_TABLE_FROM_LENGTHS(luma_ac_vlc, LUMA_AC_BITS, FF_ARRAY_ELEMS(luma_ac_len),
    
                                             luma_ac_len, 1,
    
                                             ff_mjpeg_val_ac_luminance, 1, 1,
    
                                             0, 0);
    
      ✗
          VLC_INIT_STATIC_TABLE_FROM_LENGTHS(chroma_ac_vlc, CHROMA_AC_BITS, FF_ARRAY_ELEMS(chroma_ac_len),
    
                                             chroma_ac_len, 1,
    
                                             ff_mjpeg_val_ac_chrominance, 1, 1,
    
                                             0, 0);
    
      ✗
      }
    
      typedef struct LeadContext {
    
          uint8_t *bitstream_buf;
    
          unsigned int bitstream_buf_size;
    
          BlockDSPContext bdsp;
    
          IDCTDSPContext idsp;
    
          uint8_t permutated_scantable[64];
    
      } LeadContext;
    
      ✗
      static av_cold int lead_decode_init(AVCodecContext * avctx)
    
      {
    
          static AVOnce init_static_once = AV_ONCE_INIT;
    
      ✗
          LeadContext *s = avctx->priv_data;
    
      ✗
          if (avctx->extradata_size < 20)
    
      ✗
              return AVERROR_INVALIDDATA;
    
      ✗
          ff_blockdsp_init(&s->bdsp);
    
      ✗
          ff_idctdsp_init(&s->idsp, avctx);
    
      ✗
          ff_permute_scantable(s->permutated_scantable, ff_zigzag_direct, s->idsp.idct_permutation);
    
      ✗
          ff_thread_once(&init_static_once, lead_init_static_data);
    
      ✗
          return 0;
    
      }
    
      ✗
      static void calc_dequant(uint16_t * dequant, const uint8_t * quant_tbl, int q)
    
      {
    
      ✗
          for (int i = 0; i < 64; i++)
    
      ✗
              dequant[i] = av_clip(q * quant_tbl[ff_zigzag_direct[i]] / 50, 2, 32767);
    
      ✗
      }
    
      ✗
      static int decode_block(LeadContext * s, GetBitContext * gb,
    
                              const VLCElem * dc_table, int dc_bits, const VLCElem * ac_table, int ac_bits,
    
                              int16_t * dc_pred, const uint16_t * dequant,
    
                              uint8_t * dst, int stride)
    
      {
    
          DECLARE_ALIGNED(32, int16_t, block)[64];
    
          int size;
    
      ✗
          s->bdsp.clear_block(block);
    
      ✗
          if (get_bits_left(gb) <= 0)
    
      ✗
              return AVERROR_INVALIDDATA;
    
      ✗
          size = get_vlc2(gb, dc_table, dc_bits, 1);
    
      ✗
          if (size < 0)
    
      ✗
              return AVERROR_INVALIDDATA;
    
      ✗
          if (size)
    
      ✗
              *dc_pred += get_xbits(gb, size);
    
      ✗
          block[0] = (1 << 10) + *dc_pred * dequant[0];
    
      ✗
          for (int i = 1; i < 64; i++) {
    
      ✗
              int symbol = get_vlc2(gb, ac_table, ac_bits, 2);
    
      ✗
              if (symbol < 0)
    
      ✗
                  return AVERROR_INVALIDDATA;
    
      ✗
              if (!symbol)
    
      ✗
                  break;
    
      ✗
              i += symbol >> 4;
    
      ✗
              if (i >= 64)
    
      ✗
                  return AVERROR_INVALIDDATA;
    
      ✗
              size = symbol & 0xF;
    
      ✗
              if (size)
    
      ✗
                  block[s->permutated_scantable[i]] = get_xbits(gb, size) * dequant[i];
    
          }
    
      ✗
          s->idsp.idct_put(dst, stride, block);
    
      ✗
          return 0;
    
      }
    
      ✗
      static int lead_decode_frame(AVCodecContext *avctx, AVFrame * frame,
    
                                   int * got_frame, AVPacket * avpkt)
    
      {
    
      ✗
          LeadContext *s = avctx->priv_data;
    
      ✗
          const uint8_t * buf = avpkt->data;
    
      ✗
          int ret, format, zero = 0, yuv20p_half = 0, fields = 1, q, size;
    
          GetBitContext gb;
    
      ✗
          int16_t dc_pred[3] = {0, 0, 0};
    
          uint16_t dequant[2][64];
    
      ✗
          if (avpkt->size < 8)
    
      ✗
              return AVERROR_INVALIDDATA;
    
      ✗
          format = AV_RL16(buf + 4);
    
      ✗
          switch(format) {
    
      ✗
          case 0x0:
    
      ✗
              zero = 1;
    
      ✗
              avctx->pix_fmt = AV_PIX_FMT_YUV420P;
    
      ✗
              break;
    
      ✗
          case 0x6:
    
          case 0x8000:
    
      ✗
              yuv20p_half = 1;
    
              // fall-through
    
      ✗
          case 0x1000:
    
      ✗
              avctx->pix_fmt = AV_PIX_FMT_YUV420P;
    
      ✗
              break;
    
      ✗
          case 0x1006:
    
      ✗
              fields = 2;
    
      ✗
              avctx->pix_fmt = AV_PIX_FMT_YUV420P;
    
      ✗
              break;
    
      ✗
          case 0x2000:
    
      ✗
              avctx->pix_fmt = AV_PIX_FMT_YUV444P;
    
      ✗
              break;
    
      ✗
          case 0x2006:
    
      ✗
              avctx->pix_fmt = AV_PIX_FMT_YUV444P;
    
      ✗
              fields = 2;
    
      ✗
              break;
    
      ✗
          default:
    
      ✗
              avpriv_request_sample(avctx, "unsupported format 0x%x", format);
    
      ✗
              return AVERROR_PATCHWELCOME;
    
          }
    
      ✗
          q = AV_RL16(buf + 6);
    
      ✗
          calc_dequant(dequant[0], ff_mjpeg_std_luminance_quant_tbl, q);
    
      ✗
          calc_dequant(dequant[1], ff_mjpeg_std_chrominance_quant_tbl, q);
    
      ✗
          if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
    
      ✗
              return ret;
    
      ✗
          av_fast_padded_malloc(&s->bitstream_buf, &s->bitstream_buf_size, avpkt->size - 8);
    
      ✗
          if (!s->bitstream_buf)
    
      ✗
              return AVERROR(ENOMEM);
    
      ✗
          size = 0;
    
      ✗
          for (int i = 8; i < avpkt->size; i++) {
    
      ✗
              int src = buf[i] ^ 0x80;
    
      ✗
              s->bitstream_buf[size++] = src;
    
      ✗
              if (src == 0xFF && i + 1 < avpkt->size && (buf[i + 1] ^ 0x80) == 0x00)
    
      ✗
                  i++;
    
          }
    
      ✗
          ret = init_get_bits8(&gb, s->bitstream_buf, size);
    
      ✗
          if (ret < 0)
    
      ✗
              return ret;
    
      ✗
          if (avctx->pix_fmt == AV_PIX_FMT_YUV420P && zero) {
    
      ✗
              for (int mb_y = 0; mb_y < avctx->height / 8; mb_y++)
    
      ✗
                  for (int mb_x = 0; mb_x < avctx->width / 16; mb_x++)
    
      ✗
                      for (int b = 0; b < 4; b++) {
    
      ✗
                          int luma_block = 2;
    
      ✗
                          const VLCElem * dc_vlc = b < luma_block ? luma_dc_vlc : chroma_dc_vlc;
    
      ✗
                          int dc_bits            = b < luma_block ? LUMA_DC_BITS : CHROMA_DC_BITS;
    
      ✗
                          const VLCElem * ac_vlc = b < luma_block ? luma_ac_vlc : chroma_ac_vlc;
    
      ✗
                          int ac_bits            = b < luma_block ? LUMA_AC_BITS : CHROMA_AC_BITS;
    
      ✗
                          int plane              = b < luma_block ? 0 : b - 1;
    
                          int x, y, yclip;
    
      ✗
                          if (b < luma_block) {
    
      ✗
                              y = 8*mb_y + 8*(b >> 1);
    
      ✗
                              x = 16*mb_x + 8*(b & 1);
    
      ✗
                              yclip = 0;
    
                          } else {
    
      ✗
                              y = 4*mb_y;
    
      ✗
                              x = 8*mb_x;
    
      ✗
                              yclip = y + 8 >= avctx->height / 2;
    
                          }
    
      ✗
                          if (yclip) {
    
                              uint8_t tmp[64];
    
      ✗
                              ret = decode_block(s, &gb, dc_vlc, dc_bits, ac_vlc, ac_bits,
    
      ✗
                                  dc_pred + plane, dequant[!(b < 4)], tmp, 8);
    
      ✗
                              for (int yy = 0; yy < 8 && y + yy < avctx->height / 2; yy++)
    
      ✗
                                  memcpy(frame->data[plane] + (y+yy)*frame->linesize[plane] + x, tmp + yy, 8);
    
                          } else {
    
      ✗
                              ret = decode_block(s, &gb, dc_vlc, dc_bits, ac_vlc, ac_bits,
    
      ✗
                                  dc_pred + plane, dequant[!(b < 4)],
    
      ✗
                                  frame->data[plane] + y*frame->linesize[plane] + x,
    
                                  frame->linesize[plane]);
    
                          }
    
      ✗
                          if (ret < 0)
    
      ✗
                              return ret;
    
                      }
    
      ✗
          } else if (avctx->pix_fmt == AV_PIX_FMT_YUV420P) {
    
      ✗
              for (int f = 0; f < fields; f++)
    
      ✗
              for (int mb_y = 0; mb_y < (avctx->height + 15) / 16 / fields; mb_y++)
    
      ✗
                  for (int mb_x = 0; mb_x < (avctx->width + 15) / 16; mb_x++)
    
      ✗
                      for (int b = 0; b < (yuv20p_half ? 4 : 6); b++) {
    
      ✗
                          int luma_block = yuv20p_half ? 2 : 4;
    
      ✗
                          const VLCElem * dc_vlc = b < luma_block ? luma_dc_vlc : chroma_dc_vlc;
    
      ✗
                          int dc_bits            = b < luma_block ? LUMA_DC_BITS : CHROMA_DC_BITS;
    
      ✗
                          const VLCElem * ac_vlc = b < luma_block ? luma_ac_vlc : chroma_ac_vlc;
    
      ✗
                          int ac_bits            = b < luma_block ? LUMA_AC_BITS : CHROMA_AC_BITS;
    
      ✗
                          int plane              = b < luma_block ? 0 : b - (yuv20p_half ? 1 : 3);
    
                          int x, y;
    
      ✗
                          if (b < luma_block) {
    
      ✗
                              y = 16*mb_y + 8*(b >> 1);
    
      ✗
                              x = 16*mb_x + 8*(b & 1);
    
                          } else {
    
      ✗
                              y = 8*mb_y;
    
      ✗
                              x = 8*mb_x;
    
                          }
    
      ✗
                          ret = decode_block(s, &gb, dc_vlc, dc_bits, ac_vlc, ac_bits,
    
      ✗
                              dc_pred + plane, dequant[!(b < 4)],
    
      ✗
                              frame->data[plane] + (f + y*fields)*frame->linesize[plane] + x,
    
      ✗
                              (yuv20p_half && b < 2 ? 2 : 1) * fields * frame->linesize[plane]);
    
      ✗
                          if (ret < 0)
    
      ✗
                              return ret;
    
      ✗
                          if (yuv20p_half && b < 2)
    
      ✗
                              copy_block8(frame->data[plane] + (y + 1)*frame->linesize[plane] + x,
    
      ✗
                                          frame->data[plane] + y*frame->linesize[plane] + x,
    
      ✗
                                          2*frame->linesize[plane], 2*frame->linesize[plane], 8);
    
                      }
    
          } else {
    
      ✗
              for (int f = 0; f < fields; f++)
    
      ✗
                  for (int j = 0; j < (avctx->height + 7) / fields / 8; j++)
    
      ✗
                      for (int i = 0; i < (avctx->width + 7) / 8; i++)
    
      ✗
                          for (int plane = 0; plane < 3; plane++) {
    
      ✗
                              const VLCElem * dc_vlc = !plane ? luma_dc_vlc : chroma_dc_vlc;
    
      ✗
                              int dc_bits            = !plane ? LUMA_DC_BITS : CHROMA_DC_BITS;
    
      ✗
                              const VLCElem * ac_vlc = !plane ? luma_ac_vlc : chroma_ac_vlc;
    
      ✗
                              int ac_bits            = !plane ? LUMA_AC_BITS : CHROMA_AC_BITS;
    
      ✗
                              ret = decode_block(s, &gb, dc_vlc, dc_bits, ac_vlc, ac_bits,
    
      ✗
                                  dc_pred + plane, dequant[!!plane],
    
      ✗
                                  frame->data[plane] + (f + 8*j*fields)*frame->linesize[plane] + 8*i,
    
      ✗
                                  fields * frame->linesize[plane]);
    
      ✗
                              if (ret < 0)
    
      ✗
                                  return ret;
    
                          }
    
          }
    
      ✗
          *got_frame = 1;
    
      ✗
          return avpkt->size;
    
      }
    
      ✗
      static av_cold int lead_decode_end(AVCodecContext * avctx)
    
      {
    
      ✗
          LeadContext *s = avctx->priv_data;
    
      ✗
          av_freep(&s->bitstream_buf);
    
      ✗
          return 0;
    
      }
    
      const FFCodec ff_lead_decoder = {
    
          .p.name         = "lead",
    
          CODEC_LONG_NAME("LEAD MCMP"),
    
          .p.type         = AVMEDIA_TYPE_VIDEO,
    
          .p.id           = AV_CODEC_ID_LEAD,
    
          .priv_data_size = sizeof(LeadContext),
    
          .init           = lead_decode_init,
    
          .close          = lead_decode_end,
    
          FF_CODEC_DECODE_CB(lead_decode_frame),
    
          .p.capabilities = AV_CODEC_CAP_DR1,
    
          .caps_internal  = FF_CODEC_CAP_INIT_CLEANUP,
    
      };

Line	Exec	Source
1		/*
2		* LEAD MCMP decoder
3		*
4		* Copyright (c) 2023 Peter Ross
5		*
6		* This file is part of FFmpeg.
7		*
8		* FFmpeg is free software; you can redistribute it and/or
9		* modify it under the terms of the GNU Lesser General Public
10		* License as published by the Free Software Foundation; either
11		* version 2.1 of the License, or (at your option) any later version.
12		*
13		* FFmpeg is distributed in the hope that it will be useful,
14		* but WITHOUT ANY WARRANTY; without even the implied warranty of
15		* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16		* Lesser General Public License for more details.
17		*
18		* You should have received a copy of the GNU Lesser General Public
19		* License along with FFmpeg; if not, write to the Free Software
20		* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21		*/
22
23		#include "avcodec.h"
24		#include "blockdsp.h"
25		#include "codec_internal.h"
26		#include "copy_block.h"
27		#include "decode.h"
28		#include "get_bits.h"
29		#include "idctdsp.h"
30		#include "jpegquanttables.h"
31		#include "jpegtables.h"
32		#include "leaddata.h"
33		#include "libavutil/mem.h"
34		#include "libavutil/mem_internal.h"
35		#include "libavutil/thread.h"
36
37		#define LUMA_DC_BITS 9
38		#define CHROMA_DC_BITS 11
39		#define LUMA_AC_BITS 10
40		#define CHROMA_AC_BITS 10
41
42		static VLCElem luma_dc_vlc[1 << LUMA_DC_BITS];
43		static VLCElem chroma_dc_vlc[1 << CHROMA_DC_BITS];
44		static VLCElem luma_ac_vlc[1160];
45		static VLCElem chroma_ac_vlc[1160];
46
47	✗	static av_cold void lead_init_static_data(void)
48		{
49	✗	VLC_INIT_STATIC_TABLE_FROM_LENGTHS(luma_dc_vlc, LUMA_DC_BITS, FF_ARRAY_ELEMS(luma_dc_len),
50		luma_dc_len, 1,
51		NULL, 0, 0,
52		0, 0);
53	✗	VLC_INIT_STATIC_TABLE_FROM_LENGTHS(chroma_dc_vlc, CHROMA_DC_BITS, FF_ARRAY_ELEMS(chroma_dc_len),
54		chroma_dc_len, 1,
55		NULL, 0, 0,
56		0, 0);
57	✗	VLC_INIT_STATIC_TABLE_FROM_LENGTHS(luma_ac_vlc, LUMA_AC_BITS, FF_ARRAY_ELEMS(luma_ac_len),
58		luma_ac_len, 1,
59		ff_mjpeg_val_ac_luminance, 1, 1,
60		0, 0);
61	✗	VLC_INIT_STATIC_TABLE_FROM_LENGTHS(chroma_ac_vlc, CHROMA_AC_BITS, FF_ARRAY_ELEMS(chroma_ac_len),
62		chroma_ac_len, 1,
63		ff_mjpeg_val_ac_chrominance, 1, 1,
64		0, 0);
65	✗	}
66
67		typedef struct LeadContext {
68		uint8_t *bitstream_buf;
69		unsigned int bitstream_buf_size;
70		BlockDSPContext bdsp;
71		IDCTDSPContext idsp;
72		uint8_t permutated_scantable[64];
73		} LeadContext;
74
75	✗	static av_cold int lead_decode_init(AVCodecContext * avctx)
76		{
77		static AVOnce init_static_once = AV_ONCE_INIT;
78	✗	LeadContext *s = avctx->priv_data;
79
80	✗	if (avctx->extradata_size < 20)
81	✗	return AVERROR_INVALIDDATA;
82
83	✗	ff_blockdsp_init(&s->bdsp);
84	✗	ff_idctdsp_init(&s->idsp, avctx);
85	✗	ff_permute_scantable(s->permutated_scantable, ff_zigzag_direct, s->idsp.idct_permutation);
86
87	✗	ff_thread_once(&init_static_once, lead_init_static_data);
88
89	✗	return 0;
90		}
91
92	✗	static void calc_dequant(uint16_t * dequant, const uint8_t * quant_tbl, int q)
93		{
94	✗	for (int i = 0; i < 64; i++)
95	✗	dequant[i] = av_clip(q * quant_tbl[ff_zigzag_direct[i]] / 50, 2, 32767);
96	✗	}
97
98	✗	static int decode_block(LeadContext * s, GetBitContext * gb,
99		const VLCElem * dc_table, int dc_bits, const VLCElem * ac_table, int ac_bits,
100		int16_t * dc_pred, const uint16_t * dequant,
101		uint8_t * dst, int stride)
102		{
103		DECLARE_ALIGNED(32, int16_t, block)[64];
104		int size;
105
106	✗	s->bdsp.clear_block(block);
107
108	✗	if (get_bits_left(gb) <= 0)
109	✗	return AVERROR_INVALIDDATA;
110
111	✗	size = get_vlc2(gb, dc_table, dc_bits, 1);
112	✗	if (size < 0)
113	✗	return AVERROR_INVALIDDATA;
114
115	✗	if (size)
116	✗	*dc_pred += get_xbits(gb, size);
117
118	✗	block[0] = (1 << 10) + dc_pred dequant[0];
119
120	✗	for (int i = 1; i < 64; i++) {
121	✗	int symbol = get_vlc2(gb, ac_table, ac_bits, 2);
122	✗	if (symbol < 0)
123	✗	return AVERROR_INVALIDDATA;
124
125	✗	if (!symbol)
126	✗	break;
127
128	✗	i += symbol >> 4;
129	✗	if (i >= 64)
130	✗	return AVERROR_INVALIDDATA;
131
132	✗	size = symbol & 0xF;
133	✗	if (size)
134	✗	block[s->permutated_scantable[i]] = get_xbits(gb, size) * dequant[i];
135		}
136
137	✗	s->idsp.idct_put(dst, stride, block);
138	✗	return 0;
139		}
140
141	✗	static int lead_decode_frame(AVCodecContext avctx, AVFrame frame,
142		int * got_frame, AVPacket * avpkt)
143		{
144	✗	LeadContext *s = avctx->priv_data;
145	✗	const uint8_t * buf = avpkt->data;
146	✗	int ret, format, zero = 0, yuv20p_half = 0, fields = 1, q, size;
147		GetBitContext gb;
148	✗	int16_t dc_pred[3] = {0, 0, 0};
149		uint16_t dequant[2][64];
150
151	✗	if (avpkt->size < 8)
152	✗	return AVERROR_INVALIDDATA;
153
154	✗	format = AV_RL16(buf + 4);
155	✗	switch(format) {
156	✗	case 0x0:
157	✗	zero = 1;
158	✗	avctx->pix_fmt = AV_PIX_FMT_YUV420P;
159	✗	break;
160	✗	case 0x6:
161		case 0x8000:
162	✗	yuv20p_half = 1;
163		// fall-through
164	✗	case 0x1000:
165	✗	avctx->pix_fmt = AV_PIX_FMT_YUV420P;
166	✗	break;
167	✗	case 0x1006:
168	✗	fields = 2;
169	✗	avctx->pix_fmt = AV_PIX_FMT_YUV420P;
170	✗	break;
171	✗	case 0x2000:
172	✗	avctx->pix_fmt = AV_PIX_FMT_YUV444P;
173	✗	break;
174	✗	case 0x2006:
175	✗	avctx->pix_fmt = AV_PIX_FMT_YUV444P;
176	✗	fields = 2;
177	✗	break;
178	✗	default:
179	✗	avpriv_request_sample(avctx, "unsupported format 0x%x", format);
180	✗	return AVERROR_PATCHWELCOME;
181		}
182
183	✗	q = AV_RL16(buf + 6);
184	✗	calc_dequant(dequant[0], ff_mjpeg_std_luminance_quant_tbl, q);
185	✗	calc_dequant(dequant[1], ff_mjpeg_std_chrominance_quant_tbl, q);
186
187	✗	if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
188	✗	return ret;
189
190	✗	av_fast_padded_malloc(&s->bitstream_buf, &s->bitstream_buf_size, avpkt->size - 8);
191	✗	if (!s->bitstream_buf)
192	✗	return AVERROR(ENOMEM);
193
194	✗	size = 0;
195	✗	for (int i = 8; i < avpkt->size; i++) {
196	✗	int src = buf[i] ^ 0x80;
197	✗	s->bitstream_buf[size++] = src;
198	✗	if (src == 0xFF && i + 1 < avpkt->size && (buf[i + 1] ^ 0x80) == 0x00)
199	✗	i++;
200		}
201
202	✗	ret = init_get_bits8(&gb, s->bitstream_buf, size);
203	✗	if (ret < 0)
204	✗	return ret;
205
206	✗	if (avctx->pix_fmt == AV_PIX_FMT_YUV420P && zero) {
207	✗	for (int mb_y = 0; mb_y < avctx->height / 8; mb_y++)
208	✗	for (int mb_x = 0; mb_x < avctx->width / 16; mb_x++)
209	✗	for (int b = 0; b < 4; b++) {
210	✗	int luma_block = 2;
211	✗	const VLCElem * dc_vlc = b < luma_block ? luma_dc_vlc : chroma_dc_vlc;
212	✗	int dc_bits = b < luma_block ? LUMA_DC_BITS : CHROMA_DC_BITS;
213	✗	const VLCElem * ac_vlc = b < luma_block ? luma_ac_vlc : chroma_ac_vlc;
214	✗	int ac_bits = b < luma_block ? LUMA_AC_BITS : CHROMA_AC_BITS;
215	✗	int plane = b < luma_block ? 0 : b - 1;
216		int x, y, yclip;
217
218	✗	if (b < luma_block) {
219	✗	y = 8mb_y + 8(b >> 1);
220	✗	x = 16mb_x + 8(b & 1);
221	✗	yclip = 0;
222		} else {
223	✗	y = 4*mb_y;
224	✗	x = 8*mb_x;
225	✗	yclip = y + 8 >= avctx->height / 2;
226		}
227
228	✗	if (yclip) {
229		uint8_t tmp[64];
230	✗	ret = decode_block(s, &gb, dc_vlc, dc_bits, ac_vlc, ac_bits,
231	✗	dc_pred + plane, dequant[!(b < 4)], tmp, 8);
232	✗	for (int yy = 0; yy < 8 && y + yy < avctx->height / 2; yy++)
233	✗	memcpy(frame->data[plane] + (y+yy)*frame->linesize[plane] + x, tmp + yy, 8);
234		} else {
235	✗	ret = decode_block(s, &gb, dc_vlc, dc_bits, ac_vlc, ac_bits,
236	✗	dc_pred + plane, dequant[!(b < 4)],
237	✗	frame->data[plane] + y*frame->linesize[plane] + x,
238		frame->linesize[plane]);
239		}
240	✗	if (ret < 0)
241	✗	return ret;
242		}
243	✗	} else if (avctx->pix_fmt == AV_PIX_FMT_YUV420P) {
244	✗	for (int f = 0; f < fields; f++)
245	✗	for (int mb_y = 0; mb_y < (avctx->height + 15) / 16 / fields; mb_y++)
246	✗	for (int mb_x = 0; mb_x < (avctx->width + 15) / 16; mb_x++)
247	✗	for (int b = 0; b < (yuv20p_half ? 4 : 6); b++) {
248	✗	int luma_block = yuv20p_half ? 2 : 4;
249	✗	const VLCElem * dc_vlc = b < luma_block ? luma_dc_vlc : chroma_dc_vlc;
250	✗	int dc_bits = b < luma_block ? LUMA_DC_BITS : CHROMA_DC_BITS;
251	✗	const VLCElem * ac_vlc = b < luma_block ? luma_ac_vlc : chroma_ac_vlc;
252	✗	int ac_bits = b < luma_block ? LUMA_AC_BITS : CHROMA_AC_BITS;
253	✗	int plane = b < luma_block ? 0 : b - (yuv20p_half ? 1 : 3);
254		int x, y;
255
256	✗	if (b < luma_block) {
257	✗	y = 16mb_y + 8(b >> 1);
258	✗	x = 16mb_x + 8(b & 1);
259		} else {
260	✗	y = 8*mb_y;
261	✗	x = 8*mb_x;
262		}
263
264	✗	ret = decode_block(s, &gb, dc_vlc, dc_bits, ac_vlc, ac_bits,
265	✗	dc_pred + plane, dequant[!(b < 4)],
266	✗	frame->data[plane] + (f + yfields)frame->linesize[plane] + x,
267	✗	(yuv20p_half && b < 2 ? 2 : 1) * fields * frame->linesize[plane]);
268	✗	if (ret < 0)
269	✗	return ret;
270
271	✗	if (yuv20p_half && b < 2)
272	✗	copy_block8(frame->data[plane] + (y + 1)*frame->linesize[plane] + x,
273	✗	frame->data[plane] + y*frame->linesize[plane] + x,
274	✗	2frame->linesize[plane], 2frame->linesize[plane], 8);
275		}
276		} else {
277	✗	for (int f = 0; f < fields; f++)
278	✗	for (int j = 0; j < (avctx->height + 7) / fields / 8; j++)
279	✗	for (int i = 0; i < (avctx->width + 7) / 8; i++)
280	✗	for (int plane = 0; plane < 3; plane++) {
281	✗	const VLCElem * dc_vlc = !plane ? luma_dc_vlc : chroma_dc_vlc;
282	✗	int dc_bits = !plane ? LUMA_DC_BITS : CHROMA_DC_BITS;
283	✗	const VLCElem * ac_vlc = !plane ? luma_ac_vlc : chroma_ac_vlc;
284	✗	int ac_bits = !plane ? LUMA_AC_BITS : CHROMA_AC_BITS;
285
286	✗	ret = decode_block(s, &gb, dc_vlc, dc_bits, ac_vlc, ac_bits,
287	✗	dc_pred + plane, dequant[!!plane],
288	✗	frame->data[plane] + (f + 8jfields)frame->linesize[plane] + 8i,
289	✗	fields * frame->linesize[plane]);
290	✗	if (ret < 0)
291	✗	return ret;
292		}
293		}
294
295	✗	*got_frame = 1;
296
297	✗	return avpkt->size;
298		}
299
300	✗	static av_cold int lead_decode_end(AVCodecContext * avctx)
301		{
302	✗	LeadContext *s = avctx->priv_data;
303
304	✗	av_freep(&s->bitstream_buf);
305
306	✗	return 0;
307		}
308
309		const FFCodec ff_lead_decoder = {
310		.p.name = "lead",
311		CODEC_LONG_NAME("LEAD MCMP"),
312		.p.type = AVMEDIA_TYPE_VIDEO,
313		.p.id = AV_CODEC_ID_LEAD,
314		.priv_data_size = sizeof(LeadContext),
315		.init = lead_decode_init,
316		.close = lead_decode_end,
317		FF_CODEC_DECODE_CB(lead_decode_frame),
318		.p.capabilities = AV_CODEC_CAP_DR1,
319		.caps_internal = FF_CODEC_CAP_INIT_CLEANUP,
320		};
321

Function (Line)	Call count	Block coverage
calc_dequant (line 92)	not called	0.0%
decode_block (line 98)	not called	0.0%
lead_decode_end (line 300)	not called	0.0%
lead_decode_frame (line 141)	not called	0.0%
lead_decode_init (line 75)	not called	0.0%
lead_init_static_data (line 47)	not called	0.0%