FFmpeg coverage

Directory:	../../../ffmpeg/
File:	src/libavcodec/vmixdec.c
Date:	2026-01-16 07:34:38

	Total	Coverage
Lines:	137	0.0%
Functions:	7	0.0%
Branches:	66	0.0%

  
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      /*
    
       * vMix decoder
    
       * Copyright (c) 2023 Paul B Mahol
    
       *
    
       * 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 <stdio.h>
    
      #include <stdlib.h>
    
      #include <string.h>
    
      #include "libavutil/intreadwrite.h"
    
      #include "libavutil/mem.h"
    
      #include "libavutil/mem_internal.h"
    
      #include "avcodec.h"
    
      #include "codec_internal.h"
    
      #define CACHED_BITSTREAM_READER !ARCH_X86_32
    
      #include "golomb.h"
    
      #include "get_bits.h"
    
      #include "idctdsp.h"
    
      #include "thread.h"
    
      typedef struct SliceContext {
    
          const uint8_t *dc_ptr;
    
          const uint8_t *ac_ptr;
    
          unsigned dc_size;
    
          unsigned ac_size;
    
      } SliceContext;
    
      typedef struct VMIXContext {
    
          int nb_slices;
    
          int lshift;
    
          int16_t factors[64];
    
          uint8_t scan[64];
    
          SliceContext *slices;
    
          unsigned int slices_size;
    
          IDCTDSPContext idsp;
    
      } VMIXContext;
    
      static const uint8_t quality[] = {
    
          1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
    
          1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
    
          1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
    
          1, 1, 1, 1, 1, 1,64,63,62,61,
    
         60,59,58,57,56,55,54,53,52,51,
    
         50,49,48,47,46,45,44,43,42,41,
    
         40,39,38,37,36,35,34,33,32,31,
    
         30,29,28,27,26,25,24,23,22,21,
    
         20,19,18,17,16,15,14,13,12,11,
    
         10, 9, 8, 7, 6, 5, 4, 3, 2, 1,
    
      };
    
      static const uint8_t quant[64] = {
    
          16, 16, 19, 22, 22, 26, 26, 27,
    
          16, 16, 22, 22, 26, 27, 27, 29,
    
          19, 22, 26, 26, 27, 29, 29, 35,
    
          22, 24, 27, 27, 29, 32, 34, 38,
    
          26, 27, 29, 29, 32, 35, 38, 46,
    
          27, 29, 34, 34, 35, 40, 46, 56,
    
          29, 34, 34, 37, 40, 48, 56, 69,
    
          34, 37, 38, 40, 48, 58, 69, 83,
    
      };
    
      ✗
      static av_cold int decode_init(AVCodecContext *avctx)
    
      {
    
      ✗
          VMIXContext *s = avctx->priv_data;
    
      ✗
          avctx->bits_per_raw_sample = 8;
    
      ✗
          avctx->pix_fmt = AV_PIX_FMT_YUV422P;
    
      ✗
          avctx->coded_width = FFALIGN(avctx->width, 16);
    
      ✗
          avctx->coded_height = FFALIGN(avctx->height, 16);
    
      ✗
          ff_idctdsp_init(&s->idsp, avctx);
    
      ✗
          ff_permute_scantable(s->scan, ff_zigzag_direct,
    
      ✗
                               s->idsp.idct_permutation);
    
      ✗
          return 0;
    
      }
    
      ✗
      static inline int get_se_golomb_vmix(GetBitContext *gb)
    
      {
    
      ✗
          unsigned int buf = get_ue_golomb_long(gb);
    
      ✗
          int sign = (buf & 1) - 1;
    
      ✗
          return ((buf >> 1) ^ (~sign));
    
      }
    
      ✗
      static int decode_dcac(AVCodecContext *avctx,
    
                             GetBitContext *dc_gb, GetBitContext *ac_gb,
    
                             unsigned *dcrun, unsigned *acrun,
    
                             AVFrame *frame, int width, int by, int plane)
    
      {
    
      ✗
          const ptrdiff_t linesize = frame->linesize[plane];
    
      ✗
          uint8_t *dst = frame->data[plane] + by * linesize;
    
      ✗
          unsigned dc_run = *dcrun, ac_run = *acrun;
    
      ✗
          LOCAL_ALIGNED_32(int16_t, block, [64]);
    
      ✗
          VMIXContext *s = avctx->priv_data;
    
      ✗
          const int16_t *factors = s->factors;
    
      ✗
          const uint8_t *scan = s->scan;
    
      ✗
          const int add = plane ? 0 : 1024;
    
      ✗
          int i, dc_v = 0, ac_v = 0, dc = 0;
    
      ✗
          const int lshift = s->lshift;
    
      ✗
          for (int y = 0; y < 2; y++) {
    
      ✗
              for (int x = 0; x < width; x += 8) {
    
      ✗
                  memset(block, 0, sizeof(*block)*64);
    
      ✗
                  if (dc_run > 0) {
    
      ✗
                      dc_run--;
    
                  } else {
    
      ✗
                      if (get_bits_left(dc_gb) < 1)
    
      ✗
                          return AVERROR_INVALIDDATA;
    
      ✗
                      dc_v = get_se_golomb_vmix(dc_gb);
    
      ✗
                      dc += (unsigned)dc_v;
    
      ✗
                      if (!dc_v)
    
      ✗
                          dc_run = get_ue_golomb_long(dc_gb);
    
                  }
    
      ✗
                  for (int n = 0; n < 64; n++) {
    
      ✗
                      if (ac_run > 0) {
    
      ✗
                          ac_run--;
    
      ✗
                          continue;
    
                      }
    
      ✗
                      if (get_bits_left(ac_gb) < 1)
    
      ✗
                          return AVERROR_INVALIDDATA;
    
      ✗
                      ac_v = get_se_golomb_vmix(ac_gb);
    
      ✗
                      i = scan[n];
    
      ✗
                      block[i] = ((unsigned)ac_v * factors[i]) >> 4;
    
      ✗
                      if (!ac_v)
    
      ✗
                          ac_run = get_ue_golomb_long(ac_gb);
    
                  }
    
      ✗
                  block[0] = ((unsigned)dc << lshift) + (unsigned)add;
    
      ✗
                  s->idsp.idct_put(dst + x, linesize, block);
    
              }
    
      ✗
              dst += 8 * linesize;
    
          }
    
      ✗
          *dcrun = dc_run;
    
      ✗
          *acrun = ac_run;
    
      ✗
          return 0;
    
      }
    
      ✗
      static int decode_slice(AVCodecContext *avctx, AVFrame *frame,
    
                              const uint8_t *dc_src, unsigned dc_slice_size,
    
                              const uint8_t *ac_src, unsigned ac_slice_size,
    
                              int by)
    
      {
    
      ✗
          unsigned dc_run = 0, ac_run = 0;
    
          GetBitContext dc_gb, ac_gb;
    
          int ret;
    
      ✗
          ret = init_get_bits8(&dc_gb, dc_src, dc_slice_size);
    
      ✗
          if (ret < 0)
    
      ✗
              return ret;
    
      ✗
          ret = init_get_bits8(&ac_gb, ac_src, ac_slice_size);
    
      ✗
          if (ret < 0)
    
      ✗
              return ret;
    
      ✗
          for (int p = 0; p < 3; p++) {
    
      ✗
              const int rshift = !!p;
    
      ✗
              ret = decode_dcac(avctx, &dc_gb, &ac_gb,
    
                                &dc_run, &ac_run, frame,
    
      ✗
                                frame->width >> rshift, by, p);
    
      ✗
              if (ret < 0)
    
      ✗
                  return ret;
    
      ✗
              if (get_bits_left(&dc_gb) < 0)
    
      ✗
                  return AVERROR_INVALIDDATA;
    
      ✗
              if (get_bits_left(&ac_gb) < 0)
    
      ✗
                  return AVERROR_INVALIDDATA;
    
      ✗
              align_get_bits(&dc_gb);
    
      ✗
              align_get_bits(&ac_gb);
    
          }
    
      ✗
          if (get_bits_left(&dc_gb) > 0)
    
      ✗
              return AVERROR_INVALIDDATA;
    
      ✗
          if (get_bits_left(&ac_gb) > 0)
    
      ✗
              return AVERROR_INVALIDDATA;
    
      ✗
          return 0;
    
      }
    
      ✗
      static int decode_slices(AVCodecContext *avctx, void *arg,
    
                               int n, int thread_nb)
    
      {
    
      ✗
          VMIXContext *s = avctx->priv_data;
    
      ✗
          const uint8_t *dc_slice_ptr = s->slices[n].dc_ptr;
    
      ✗
          const uint8_t *ac_slice_ptr = s->slices[n].ac_ptr;
    
      ✗
          unsigned dc_slice_size = s->slices[n].dc_size;
    
      ✗
          unsigned ac_slice_size = s->slices[n].ac_size;
    
      ✗
          AVFrame *frame = arg;
    
      ✗
          return decode_slice(avctx, frame, dc_slice_ptr, dc_slice_size,
    
                              ac_slice_ptr, ac_slice_size, n * 16);
    
      }
    
      ✗
      static int decode_frame(AVCodecContext *avctx,
    
                              AVFrame *frame, int *got_frame,
    
                              AVPacket *avpkt)
    
      {
    
      ✗
          VMIXContext *s = avctx->priv_data;
    
          unsigned offset, q;
    
          int ret;
    
      ✗
          if (avpkt->size <= 7)
    
      ✗
              return AVERROR_INVALIDDATA;
    
      ✗
          s->lshift = 0;
    
      ✗
          offset = 2 + avpkt->data[0];
    
      ✗
          if (offset == 5)
    
      ✗
              s->lshift = avpkt->data[1];
    
      ✗
          else if (offset != 3)
    
      ✗
              return AVERROR_INVALIDDATA;
    
      ✗
          if (s->lshift > 31)
    
      ✗
              return AVERROR_INVALIDDATA;
    
      ✗
          q = quality[FFMIN(avpkt->data[offset - 2], FF_ARRAY_ELEMS(quality)-1)];
    
      ✗
          for (int n = 0; n < 64; n++)
    
      ✗
              s->factors[n] = quant[n] * q;
    
      ✗
          s->nb_slices = (avctx->height + 15) / 16;
    
      ✗
          av_fast_mallocz(&s->slices, &s->slices_size, s->nb_slices * sizeof(*s->slices));
    
      ✗
          if (!s->slices)
    
      ✗
              return AVERROR(ENOMEM);
    
      ✗
          for (int n = 0; n < s->nb_slices; n++) {
    
              unsigned slice_size;
    
      ✗
              if (offset + 4 > avpkt->size)
    
      ✗
                  return AVERROR_INVALIDDATA;
    
      ✗
              slice_size = AV_RL32(avpkt->data + offset);
    
      ✗
              if (slice_size > avpkt->size)
    
      ✗
                  return AVERROR_INVALIDDATA;
    
      ✗
              if (avpkt->size - slice_size - 4LL < offset)
    
      ✗
                  return AVERROR_INVALIDDATA;
    
      ✗
              s->slices[n].dc_size = slice_size;
    
      ✗
              s->slices[n].dc_ptr = avpkt->data + offset + 4;
    
      ✗
              offset += slice_size + 4;
    
          }
    
      ✗
          for (int n = 0; n < s->nb_slices; n++) {
    
              unsigned slice_size;
    
      ✗
              if (offset + 4 > avpkt->size)
    
      ✗
                  return AVERROR_INVALIDDATA;
    
      ✗
              slice_size = AV_RL32(avpkt->data + offset);
    
      ✗
              if (slice_size > avpkt->size)
    
      ✗
                  return AVERROR_INVALIDDATA;
    
      ✗
              if (avpkt->size - slice_size - 4LL < offset)
    
      ✗
                  return AVERROR_INVALIDDATA;
    
      ✗
              s->slices[n].ac_size = slice_size;
    
      ✗
              s->slices[n].ac_ptr = avpkt->data + offset + 4;
    
      ✗
              offset += slice_size + 4;
    
          }
    
      ✗
          ret = ff_thread_get_buffer(avctx, frame, 0);
    
      ✗
          if (ret < 0)
    
      ✗
              return ret;
    
      ✗
          avctx->execute2(avctx, decode_slices, frame, NULL, s->nb_slices);
    
      ✗
          *got_frame = 1;
    
      ✗
          return avpkt->size;
    
      }
    
      ✗
      static av_cold int decode_end(AVCodecContext *avctx)
    
      {
    
      ✗
          VMIXContext *s = avctx->priv_data;
    
      ✗
          av_freep(&s->slices);
    
      ✗
          return 0;
    
      }
    
      const FFCodec ff_vmix_decoder = {
    
          .p.name           = "vmix",
    
          CODEC_LONG_NAME("vMix Video"),
    
          .p.type           = AVMEDIA_TYPE_VIDEO,
    
          .p.id             = AV_CODEC_ID_VMIX,
    
          .priv_data_size   = sizeof(VMIXContext),
    
          .init             = decode_init,
    
          .close            = decode_end,
    
          FF_CODEC_DECODE_CB(decode_frame),
    
          .p.capabilities   = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_FRAME_THREADS |
    
                              AV_CODEC_CAP_SLICE_THREADS,
    
      };

Line	Exec	Source
1		/*
2		* vMix decoder
3		* Copyright (c) 2023 Paul B Mahol
4		*
5		* This file is part of FFmpeg.
6		*
7		* FFmpeg is free software; you can redistribute it and/or
8		* modify it under the terms of the GNU Lesser General Public
9		* License as published by the Free Software Foundation; either
10		* version 2.1 of the License, or (at your option) any later version.
11		*
12		* FFmpeg is distributed in the hope that it will be useful,
13		* but WITHOUT ANY WARRANTY; without even the implied warranty of
14		* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15		* Lesser General Public License for more details.
16		*
17		* You should have received a copy of the GNU Lesser General Public
18		* License along with FFmpeg; if not, write to the Free Software
19		* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20		*/
21
22		#include <stdio.h>
23		#include <stdlib.h>
24		#include <string.h>
25
26		#include "libavutil/intreadwrite.h"
27		#include "libavutil/mem.h"
28		#include "libavutil/mem_internal.h"
29
30		#include "avcodec.h"
31		#include "codec_internal.h"
32		#define CACHED_BITSTREAM_READER !ARCH_X86_32
33		#include "golomb.h"
34		#include "get_bits.h"
35		#include "idctdsp.h"
36		#include "thread.h"
37
38		typedef struct SliceContext {
39		const uint8_t *dc_ptr;
40		const uint8_t *ac_ptr;
41		unsigned dc_size;
42		unsigned ac_size;
43		} SliceContext;
44
45		typedef struct VMIXContext {
46		int nb_slices;
47		int lshift;
48
49		int16_t factors[64];
50		uint8_t scan[64];
51
52		SliceContext *slices;
53		unsigned int slices_size;
54
55		IDCTDSPContext idsp;
56		} VMIXContext;
57
58		static const uint8_t quality[] = {
59		1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
60		1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
61		1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
62		1, 1, 1, 1, 1, 1,64,63,62,61,
63		60,59,58,57,56,55,54,53,52,51,
64		50,49,48,47,46,45,44,43,42,41,
65		40,39,38,37,36,35,34,33,32,31,
66		30,29,28,27,26,25,24,23,22,21,
67		20,19,18,17,16,15,14,13,12,11,
68		10, 9, 8, 7, 6, 5, 4, 3, 2, 1,
69		};
70
71		static const uint8_t quant[64] = {
72		16, 16, 19, 22, 22, 26, 26, 27,
73		16, 16, 22, 22, 26, 27, 27, 29,
74		19, 22, 26, 26, 27, 29, 29, 35,
75		22, 24, 27, 27, 29, 32, 34, 38,
76		26, 27, 29, 29, 32, 35, 38, 46,
77		27, 29, 34, 34, 35, 40, 46, 56,
78		29, 34, 34, 37, 40, 48, 56, 69,
79		34, 37, 38, 40, 48, 58, 69, 83,
80		};
81
82	✗	static av_cold int decode_init(AVCodecContext *avctx)
83		{
84	✗	VMIXContext *s = avctx->priv_data;
85
86	✗	avctx->bits_per_raw_sample = 8;
87	✗	avctx->pix_fmt = AV_PIX_FMT_YUV422P;
88
89	✗	avctx->coded_width = FFALIGN(avctx->width, 16);
90	✗	avctx->coded_height = FFALIGN(avctx->height, 16);
91
92	✗	ff_idctdsp_init(&s->idsp, avctx);
93	✗	ff_permute_scantable(s->scan, ff_zigzag_direct,
94	✗	s->idsp.idct_permutation);
95	✗	return 0;
96		}
97
98	✗	static inline int get_se_golomb_vmix(GetBitContext *gb)
99		{
100	✗	unsigned int buf = get_ue_golomb_long(gb);
101	✗	int sign = (buf & 1) - 1;
102	✗	return ((buf >> 1) ^ (~sign));
103		}
104
105	✗	static int decode_dcac(AVCodecContext *avctx,
106		GetBitContext dc_gb, GetBitContext ac_gb,
107		unsigned dcrun, unsigned acrun,
108		AVFrame *frame, int width, int by, int plane)
109		{
110	✗	const ptrdiff_t linesize = frame->linesize[plane];
111	✗	uint8_t dst = frame->data[plane] + by linesize;
112	✗	unsigned dc_run = dcrun, ac_run = acrun;
113	✗	LOCAL_ALIGNED_32(int16_t, block, [64]);
114	✗	VMIXContext *s = avctx->priv_data;
115	✗	const int16_t *factors = s->factors;
116	✗	const uint8_t *scan = s->scan;
117	✗	const int add = plane ? 0 : 1024;
118	✗	int i, dc_v = 0, ac_v = 0, dc = 0;
119	✗	const int lshift = s->lshift;
120
121	✗	for (int y = 0; y < 2; y++) {
122	✗	for (int x = 0; x < width; x += 8) {
123	✗	memset(block, 0, sizeof(block)64);
124
125	✗	if (dc_run > 0) {
126	✗	dc_run--;
127		} else {
128	✗	if (get_bits_left(dc_gb) < 1)
129	✗	return AVERROR_INVALIDDATA;
130	✗	dc_v = get_se_golomb_vmix(dc_gb);
131	✗	dc += (unsigned)dc_v;
132	✗	if (!dc_v)
133	✗	dc_run = get_ue_golomb_long(dc_gb);
134		}
135
136	✗	for (int n = 0; n < 64; n++) {
137	✗	if (ac_run > 0) {
138	✗	ac_run--;
139	✗	continue;
140		}
141
142	✗	if (get_bits_left(ac_gb) < 1)
143	✗	return AVERROR_INVALIDDATA;
144	✗	ac_v = get_se_golomb_vmix(ac_gb);
145	✗	i = scan[n];
146	✗	block[i] = ((unsigned)ac_v * factors[i]) >> 4;
147	✗	if (!ac_v)
148	✗	ac_run = get_ue_golomb_long(ac_gb);
149		}
150
151	✗	block[0] = ((unsigned)dc << lshift) + (unsigned)add;
152	✗	s->idsp.idct_put(dst + x, linesize, block);
153		}
154
155	✗	dst += 8 * linesize;
156		}
157
158	✗	*dcrun = dc_run;
159	✗	*acrun = ac_run;
160
161	✗	return 0;
162		}
163
164	✗	static int decode_slice(AVCodecContext avctx, AVFrame frame,
165		const uint8_t *dc_src, unsigned dc_slice_size,
166		const uint8_t *ac_src, unsigned ac_slice_size,
167		int by)
168		{
169	✗	unsigned dc_run = 0, ac_run = 0;
170		GetBitContext dc_gb, ac_gb;
171		int ret;
172
173	✗	ret = init_get_bits8(&dc_gb, dc_src, dc_slice_size);
174	✗	if (ret < 0)
175	✗	return ret;
176
177	✗	ret = init_get_bits8(&ac_gb, ac_src, ac_slice_size);
178	✗	if (ret < 0)
179	✗	return ret;
180
181	✗	for (int p = 0; p < 3; p++) {
182	✗	const int rshift = !!p;
183	✗	ret = decode_dcac(avctx, &dc_gb, &ac_gb,
184		&dc_run, &ac_run, frame,
185	✗	frame->width >> rshift, by, p);
186	✗	if (ret < 0)
187	✗	return ret;
188
189	✗	if (get_bits_left(&dc_gb) < 0)
190	✗	return AVERROR_INVALIDDATA;
191	✗	if (get_bits_left(&ac_gb) < 0)
192	✗	return AVERROR_INVALIDDATA;
193
194	✗	align_get_bits(&dc_gb);
195	✗	align_get_bits(&ac_gb);
196		}
197
198	✗	if (get_bits_left(&dc_gb) > 0)
199	✗	return AVERROR_INVALIDDATA;
200	✗	if (get_bits_left(&ac_gb) > 0)
201	✗	return AVERROR_INVALIDDATA;
202
203	✗	return 0;
204		}
205
206	✗	static int decode_slices(AVCodecContext avctx, void arg,
207		int n, int thread_nb)
208		{
209	✗	VMIXContext *s = avctx->priv_data;
210	✗	const uint8_t *dc_slice_ptr = s->slices[n].dc_ptr;
211	✗	const uint8_t *ac_slice_ptr = s->slices[n].ac_ptr;
212	✗	unsigned dc_slice_size = s->slices[n].dc_size;
213	✗	unsigned ac_slice_size = s->slices[n].ac_size;
214	✗	AVFrame *frame = arg;
215
216	✗	return decode_slice(avctx, frame, dc_slice_ptr, dc_slice_size,
217		ac_slice_ptr, ac_slice_size, n * 16);
218		}
219
220	✗	static int decode_frame(AVCodecContext *avctx,
221		AVFrame frame, int got_frame,
222		AVPacket *avpkt)
223		{
224	✗	VMIXContext *s = avctx->priv_data;
225		unsigned offset, q;
226		int ret;
227
228	✗	if (avpkt->size <= 7)
229	✗	return AVERROR_INVALIDDATA;
230
231	✗	s->lshift = 0;
232	✗	offset = 2 + avpkt->data[0];
233	✗	if (offset == 5)
234	✗	s->lshift = avpkt->data[1];
235	✗	else if (offset != 3)
236	✗	return AVERROR_INVALIDDATA;
237
238	✗	if (s->lshift > 31)
239	✗	return AVERROR_INVALIDDATA;
240
241	✗	q = quality[FFMIN(avpkt->data[offset - 2], FF_ARRAY_ELEMS(quality)-1)];
242	✗	for (int n = 0; n < 64; n++)
243	✗	s->factors[n] = quant[n] * q;
244
245	✗	s->nb_slices = (avctx->height + 15) / 16;
246	✗	av_fast_mallocz(&s->slices, &s->slices_size, s->nb_slices * sizeof(*s->slices));
247	✗	if (!s->slices)
248	✗	return AVERROR(ENOMEM);
249
250	✗	for (int n = 0; n < s->nb_slices; n++) {
251		unsigned slice_size;
252
253	✗	if (offset + 4 > avpkt->size)
254	✗	return AVERROR_INVALIDDATA;
255
256	✗	slice_size = AV_RL32(avpkt->data + offset);
257	✗	if (slice_size > avpkt->size)
258	✗	return AVERROR_INVALIDDATA;
259
260	✗	if (avpkt->size - slice_size - 4LL < offset)
261	✗	return AVERROR_INVALIDDATA;
262
263	✗	s->slices[n].dc_size = slice_size;
264	✗	s->slices[n].dc_ptr = avpkt->data + offset + 4;
265	✗	offset += slice_size + 4;
266		}
267
268	✗	for (int n = 0; n < s->nb_slices; n++) {
269		unsigned slice_size;
270
271	✗	if (offset + 4 > avpkt->size)
272	✗	return AVERROR_INVALIDDATA;
273
274	✗	slice_size = AV_RL32(avpkt->data + offset);
275	✗	if (slice_size > avpkt->size)
276	✗	return AVERROR_INVALIDDATA;
277
278	✗	if (avpkt->size - slice_size - 4LL < offset)
279	✗	return AVERROR_INVALIDDATA;
280
281	✗	s->slices[n].ac_size = slice_size;
282	✗	s->slices[n].ac_ptr = avpkt->data + offset + 4;
283	✗	offset += slice_size + 4;
284		}
285
286	✗	ret = ff_thread_get_buffer(avctx, frame, 0);
287	✗	if (ret < 0)
288	✗	return ret;
289
290	✗	avctx->execute2(avctx, decode_slices, frame, NULL, s->nb_slices);
291
292	✗	*got_frame = 1;
293
294	✗	return avpkt->size;
295		}
296
297	✗	static av_cold int decode_end(AVCodecContext *avctx)
298		{
299	✗	VMIXContext *s = avctx->priv_data;
300	✗	av_freep(&s->slices);
301	✗	return 0;
302		}
303
304		const FFCodec ff_vmix_decoder = {
305		.p.name = "vmix",
306		CODEC_LONG_NAME("vMix Video"),
307		.p.type = AVMEDIA_TYPE_VIDEO,
308		.p.id = AV_CODEC_ID_VMIX,
309		.priv_data_size = sizeof(VMIXContext),
310		.init = decode_init,
311		.close = decode_end,
312		FF_CODEC_DECODE_CB(decode_frame),
313		.p.capabilities = AV_CODEC_CAP_DR1 \| AV_CODEC_CAP_FRAME_THREADS \|
314		AV_CODEC_CAP_SLICE_THREADS,
315		};
316

Function (Line)	Call count	Block coverage
decode_dcac (line 105)	not called	0.0%
decode_end (line 297)	not called	0.0%
decode_frame (line 220)	not called	0.0%
decode_init (line 82)	not called	0.0%
decode_slice (line 164)	not called	0.0%
decode_slices (line 206)	not called	0.0%
get_se_golomb_vmix (line 98)	not called	0.0%