四川成都阳春三月大熊猫进入“繁育季”

Directory:	../../../ffmpeg/
File:	src/libavcodec/dolby_e_parse.c
Date:	2025-08-04 11:35:17

	Exec	Total	Coverage
Lines:	63	101	62.4%
Functions:	4	4	100.0%
Branches:	25	60	41.7%

  
      Line
      Branch
      Exec
      Source
    
      /*
    
       * Copyright (C) 2017 foo86
    
       *
    
       * 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 "libavutil/avassert.h"
    
      #include "get_bits.h"
    
      #include "put_bits.h"
    
      #include "dolby_e.h"
    
      static const uint8_t nb_programs_tab[MAX_PROG_CONF + 1] = {
    
          2, 3, 2, 3, 4, 5, 4, 5, 6, 7, 8, 1, 2, 3, 3, 4, 5, 6, 1, 2, 3, 4, 1, 1
    
      };
    
      static const uint8_t nb_channels_tab[MAX_PROG_CONF + 1] = {
    
          8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 6, 6, 6, 6, 6, 6, 6, 4, 4, 4, 4, 8, 8
    
      };
    
      static const uint16_t sample_rate_tab[16] = {
    
          0, 42965, 43008, 44800, 53706, 53760
    
      };
    
      1284
      static int skip_input(DBEContext *s, int nb_words)
    
      {
    
        1/2✗ Branch 0 not taken.
✓ Branch 1 taken 1284 times.

      1284
          if (nb_words > s->input_size) {
    
      ✗
              return AVERROR_INVALIDDATA;
    
          }
    
      1284
          s->input      += nb_words * s->word_bytes;
    
      1284
          s->input_size -= nb_words;
    
      1284
          return 0;
    
      }
    
      642
      static int parse_key(DBEContext *s)
    
      {
    
        1/2✓ Branch 0 taken 642 times.
✗ Branch 1 not taken.

      642
          if (s->key_present) {
    
      642
              const uint8_t *key = s->input;
    
      642
              int      ret = skip_input(s, 1);
    
        1/2✗ Branch 0 not taken.
✓ Branch 1 taken 642 times.

      642
              if (ret < 0)
    
      ✗
                  return ret;
    
      642
              return AV_RB24(key) >> 24 - s->word_bits;
    
          }
    
      ✗
          return 0;
    
      }
    
      4380
      int ff_dolby_e_convert_input(DBEContext *s, int nb_words, int key)
    
      {
    
      4380
          const uint8_t *src = s->input;
    
      4380
          uint8_t *dst = s->buffer;
    
          PutBitContext pb;
    
          int i;
    
        1/2✗ Branch 0 not taken.
✓ Branch 1 taken 4380 times.

      4380
          av_assert0(nb_words <= 1024u);
    
        1/2✗ Branch 0 not taken.
✓ Branch 1 taken 4380 times.

      4380
          if (nb_words > s->input_size) {
    
      ✗
              if (s->avctx)
    
      ✗
                  av_log(s->avctx, AV_LOG_ERROR, "Packet too short\n");
    
      ✗
              return AVERROR_INVALIDDATA;
    
          }
    
        1/4✓ Branch 0 taken 4380 times.
✗ Branch 1 not taken.
✗ Branch 2 not taken.
✗ Branch 3 not taken.

      4380
          switch (s->word_bits) {
    
      4380
          case 16:
    
        2/2✓ Branch 0 taken 946764 times.
✓ Branch 1 taken 4380 times.

      951144
              for (i = 0; i < nb_words; i++, src += 2, dst += 2)
    
      946764
                  AV_WB16(dst, AV_RB16(src) ^ key);
    
      4380
              break;
    
      ✗
          case 20:
    
      ✗
              init_put_bits(&pb, s->buffer, sizeof(s->buffer));
    
      ✗
              for (i = 0; i < nb_words; i++, src += 3)
    
      ✗
                  put_bits(&pb, 20, AV_RB24(src) >> 4 ^ key);
    
      ✗
              flush_put_bits(&pb);
    
      ✗
              break;
    
      ✗
          case 24:
    
      ✗
              for (i = 0; i < nb_words; i++, src += 3, dst += 3)
    
      ✗
                  AV_WB24(dst, AV_RB24(src) ^ key);
    
      ✗
              break;
    
      ✗
          default:
    
      ✗
              av_unreachable("ff_dolby_e_parse_header() only sets 16, 20, 24 and errors out otherwise");
    
          }
    
      4380
          return init_get_bits(&s->gb, s->buffer, nb_words * s->word_bits);
    
      }
    
      643
      int ff_dolby_e_parse_header(DBEContext *s, const uint8_t *buf, int buf_size)
    
      {
    
      643
          DolbyEHeaderInfo *const header = &s->metadata;
    
          int hdr, ret, key, mtd_size;
    
        2/2✓ Branch 0 taken 1 times.
✓ Branch 1 taken 642 times.

      643
          if (buf_size < 3)
    
      1
              return AVERROR_INVALIDDATA;
    
      642
          hdr = AV_RB24(buf);
    
        1/2✗ Branch 0 not taken.
✓ Branch 1 taken 642 times.

      642
          if ((hdr & 0xfffffe) == 0x7888e) {
    
      ✗
              s->word_bits = 24;
    
        1/2✗ Branch 0 not taken.
✓ Branch 1 taken 642 times.

      642
          } else if ((hdr & 0xffffe0) == 0x788e0) {
    
      ✗
              s->word_bits = 20;
    
        1/2✓ Branch 0 taken 642 times.
✗ Branch 1 not taken.

      642
          } else if ((hdr & 0xfffe00) == 0x78e00) {
    
      642
              s->word_bits = 16;
    
          } else {
    
      ✗
              if (s->avctx)
    
      ✗
                  av_log(s->avctx, AV_LOG_ERROR, "Invalid frame header\n");
    
      ✗
              return AVERROR_INVALIDDATA;
    
          }
    
      642
          s->word_bytes  = s->word_bits + 7 >> 3;
    
      642
          s->input       = buf + s->word_bytes;
    
      642
          s->input_size  = buf_size / s->word_bytes - 1;
    
      642
          s->key_present = hdr >> 24 - s->word_bits & 1;
    
        1/2✗ Branch 1 not taken.
✓ Branch 2 taken 642 times.

      642
          if ((key = parse_key(s)) < 0)
    
      ✗
              return key;
    
        1/2✗ Branch 1 not taken.
✓ Branch 2 taken 642 times.

      642
          if ((ret = ff_dolby_e_convert_input(s, 1, key)) < 0)
    
      ✗
              return ret;
    
      642
          skip_bits(&s->gb, 4);
    
      642
          mtd_size = get_bits(&s->gb, 10);
    
        1/2✗ Branch 0 not taken.
✓ Branch 1 taken 642 times.

      642
          if (!mtd_size) {
    
      ✗
              if (s->avctx)
    
      ✗
                  av_log(s->avctx, AV_LOG_ERROR, "Invalid metadata size\n");
    
      ✗
              return AVERROR_INVALIDDATA;
    
          }
    
        1/2✗ Branch 1 not taken.
✓ Branch 2 taken 642 times.

      642
          if ((ret = ff_dolby_e_convert_input(s, mtd_size, key)) < 0)
    
      ✗
              return ret;
    
      642
          skip_bits(&s->gb, 14);
    
      642
          header->prog_conf = get_bits(&s->gb, 6);
    
        1/2✗ Branch 0 not taken.
✓ Branch 1 taken 642 times.

      642
          if (header->prog_conf > MAX_PROG_CONF) {
    
      ✗
              if (s->avctx)
    
      ✗
                  av_log(s->avctx, AV_LOG_ERROR, "Invalid program configuration\n");
    
      ✗
              return AVERROR_INVALIDDATA;
    
          }
    
      642
          header->nb_channels = nb_channels_tab[header->prog_conf];
    
      642
          header->nb_programs = nb_programs_tab[header->prog_conf];
    
      642
          header->fr_code      = get_bits(&s->gb, 4);
    
      642
          header->fr_code_orig = get_bits(&s->gb, 4);
    
        1/2✓ Branch 0 taken 642 times.
✗ Branch 1 not taken.

      642
          if (!(header->sample_rate = sample_rate_tab[header->fr_code]) ||
    
        1/2✗ Branch 0 not taken.
✓ Branch 1 taken 642 times.

      642
              !sample_rate_tab[header->fr_code_orig]) {
    
      ✗
              if (s->avctx)
    
      ✗
                  av_log(s->avctx, AV_LOG_ERROR, "Invalid frame rate code\n");
    
      ✗
              return AVERROR_INVALIDDATA;
    
          }
    
      642
          skip_bits_long(&s->gb, 88);
    
        2/2✓ Branch 0 taken 3852 times.
✓ Branch 1 taken 642 times.

      4494
          for (int i = 0; i < header->nb_channels; i++)
    
      3852
              header->ch_size[i] = get_bits(&s->gb, 10);
    
      642
          header->mtd_ext_size = get_bits(&s->gb, 8);
    
      642
          header->meter_size   = get_bits(&s->gb, 8);
    
      642
          skip_bits_long(&s->gb, 10 * header->nb_programs);
    
        2/2✓ Branch 0 taken 3852 times.
✓ Branch 1 taken 642 times.

      4494
          for (int i = 0; i < header->nb_channels; i++) {
    
      3852
              header->rev_id[i]     = get_bits(&s->gb,  4);
    
      3852
              skip_bits1(&s->gb);
    
      3852
              header->begin_gain[i] = get_bits(&s->gb, 10);
    
      3852
              header->end_gain[i]   = get_bits(&s->gb, 10);
    
          }
    
        1/2✗ Branch 1 not taken.
✓ Branch 2 taken 642 times.

      642
          if (get_bits_left(&s->gb) < 0) {
    
      ✗
              if (s->avctx)
    
      ✗
                  av_log(s->avctx, AV_LOG_ERROR, "Read past end of metadata\n");
    
      ✗
              return AVERROR_INVALIDDATA;
    
          }
    
      642
          return skip_input(s, mtd_size + 1);
    
      }

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Line	Branch	Exec	Source
1			/*
2			* Copyright (C) 2017 foo86
3			*
4			* This file is part of FFmpeg.
5			*
6			* FFmpeg is free software; you can redistribute it and/or
7			* modify it under the terms of the GNU Lesser General Public
8			* License as published by the Free Software Foundation; either
9			* version 2.1 of the License, or (at your option) any later version.
10			*
11			* FFmpeg is distributed in the hope that it will be useful,
12			* but WITHOUT ANY WARRANTY; without even the implied warranty of
13			* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14			* Lesser General Public License for more details.
15			*
16			* You should have received a copy of the GNU Lesser General Public
17			* License along with FFmpeg; if not, write to the Free Software
18			* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19			*/
20
21			#include "libavutil/avassert.h"
22			#include "get_bits.h"
23			#include "put_bits.h"
24			#include "dolby_e.h"
25
26			static const uint8_t nb_programs_tab[MAX_PROG_CONF + 1] = {
27			2, 3, 2, 3, 4, 5, 4, 5, 6, 7, 8, 1, 2, 3, 3, 4, 5, 6, 1, 2, 3, 4, 1, 1
28			};
29
30			static const uint8_t nb_channels_tab[MAX_PROG_CONF + 1] = {
31			8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 6, 6, 6, 6, 6, 6, 6, 4, 4, 4, 4, 8, 8
32			};
33
34			static const uint16_t sample_rate_tab[16] = {
35			0, 42965, 43008, 44800, 53706, 53760
36			};
37
38		1284	static int skip_input(DBEContext *s, int nb_words)
39			{
40	1/2 ✗ Branch 0 not taken. ✓ Branch 1 taken 1284 times.	1284	if (nb_words > s->input_size) {
41		✗	return AVERROR_INVALIDDATA;
42			}
43
44		1284	s->input += nb_words * s->word_bytes;
45		1284	s->input_size -= nb_words;
46		1284	return 0;
47			}
48
49		642	static int parse_key(DBEContext *s)
50			{
51	1/2 ✓ Branch 0 taken 642 times. ✗ Branch 1 not taken.	642	if (s->key_present) {
52		642	const uint8_t *key = s->input;
53		642	int ret = skip_input(s, 1);
54	1/2 ✗ Branch 0 not taken. ✓ Branch 1 taken 642 times.	642	if (ret < 0)
55		✗	return ret;
56		642	return AV_RB24(key) >> 24 - s->word_bits;
57			}
58		✗	return 0;
59			}
60
61		4380	int ff_dolby_e_convert_input(DBEContext *s, int nb_words, int key)
62			{
63		4380	const uint8_t *src = s->input;
64		4380	uint8_t *dst = s->buffer;
65			PutBitContext pb;
66			int i;
67
68	1/2 ✗ Branch 0 not taken. ✓ Branch 1 taken 4380 times.	4380	av_assert0(nb_words <= 1024u);
69
70	1/2 ✗ Branch 0 not taken. ✓ Branch 1 taken 4380 times.	4380	if (nb_words > s->input_size) {
71		✗	if (s->avctx)
72		✗	av_log(s->avctx, AV_LOG_ERROR, "Packet too short\n");
73		✗	return AVERROR_INVALIDDATA;
74			}
75
76	1/4 ✓ Branch 0 taken 4380 times. ✗ Branch 1 not taken. ✗ Branch 2 not taken. ✗ Branch 3 not taken.	4380	switch (s->word_bits) {
77		4380	case 16:
78	2/2 ✓ Branch 0 taken 946764 times. ✓ Branch 1 taken 4380 times.	951144	for (i = 0; i < nb_words; i++, src += 2, dst += 2)
79		946764	AV_WB16(dst, AV_RB16(src) ^ key);
80		4380	break;
81		✗	case 20:
82		✗	init_put_bits(&pb, s->buffer, sizeof(s->buffer));
83		✗	for (i = 0; i < nb_words; i++, src += 3)
84		✗	put_bits(&pb, 20, AV_RB24(src) >> 4 ^ key);
85		✗	flush_put_bits(&pb);
86		✗	break;
87		✗	case 24:
88		✗	for (i = 0; i < nb_words; i++, src += 3, dst += 3)
89		✗	AV_WB24(dst, AV_RB24(src) ^ key);
90		✗	break;
91		✗	default:
92		✗	av_unreachable("ff_dolby_e_parse_header() only sets 16, 20, 24 and errors out otherwise");
93			}
94
95		4380	return init_get_bits(&s->gb, s->buffer, nb_words * s->word_bits);
96			}
97
98		643	int ff_dolby_e_parse_header(DBEContext s, const uint8_t buf, int buf_size)
99			{
100		643	DolbyEHeaderInfo *const header = &s->metadata;
101			int hdr, ret, key, mtd_size;
102
103	2/2 ✓ Branch 0 taken 1 times. ✓ Branch 1 taken 642 times.	643	if (buf_size < 3)
104		1	return AVERROR_INVALIDDATA;
105
106		642	hdr = AV_RB24(buf);
107	1/2 ✗ Branch 0 not taken. ✓ Branch 1 taken 642 times.	642	if ((hdr & 0xfffffe) == 0x7888e) {
108		✗	s->word_bits = 24;
109	1/2 ✗ Branch 0 not taken. ✓ Branch 1 taken 642 times.	642	} else if ((hdr & 0xffffe0) == 0x788e0) {
110		✗	s->word_bits = 20;
111	1/2 ✓ Branch 0 taken 642 times. ✗ Branch 1 not taken.	642	} else if ((hdr & 0xfffe00) == 0x78e00) {
112		642	s->word_bits = 16;
113			} else {
114		✗	if (s->avctx)
115		✗	av_log(s->avctx, AV_LOG_ERROR, "Invalid frame header\n");
116		✗	return AVERROR_INVALIDDATA;
117			}
118
119		642	s->word_bytes = s->word_bits + 7 >> 3;
120		642	s->input = buf + s->word_bytes;
121		642	s->input_size = buf_size / s->word_bytes - 1;
122		642	s->key_present = hdr >> 24 - s->word_bits & 1;
123
124	1/2 ✗ Branch 1 not taken. ✓ Branch 2 taken 642 times.	642	if ((key = parse_key(s)) < 0)
125		✗	return key;
126	1/2 ✗ Branch 1 not taken. ✓ Branch 2 taken 642 times.	642	if ((ret = ff_dolby_e_convert_input(s, 1, key)) < 0)
127		✗	return ret;
128
129		642	skip_bits(&s->gb, 4);
130		642	mtd_size = get_bits(&s->gb, 10);
131	1/2 ✗ Branch 0 not taken. ✓ Branch 1 taken 642 times.	642	if (!mtd_size) {
132		✗	if (s->avctx)
133		✗	av_log(s->avctx, AV_LOG_ERROR, "Invalid metadata size\n");
134		✗	return AVERROR_INVALIDDATA;
135			}
136
137	1/2 ✗ Branch 1 not taken. ✓ Branch 2 taken 642 times.	642	if ((ret = ff_dolby_e_convert_input(s, mtd_size, key)) < 0)
138		✗	return ret;
139
140		642	skip_bits(&s->gb, 14);
141		642	header->prog_conf = get_bits(&s->gb, 6);
142	1/2 ✗ Branch 0 not taken. ✓ Branch 1 taken 642 times.	642	if (header->prog_conf > MAX_PROG_CONF) {
143		✗	if (s->avctx)
144		✗	av_log(s->avctx, AV_LOG_ERROR, "Invalid program configuration\n");
145		✗	return AVERROR_INVALIDDATA;
146			}
147
148		642	header->nb_channels = nb_channels_tab[header->prog_conf];
149		642	header->nb_programs = nb_programs_tab[header->prog_conf];
150
151		642	header->fr_code = get_bits(&s->gb, 4);
152		642	header->fr_code_orig = get_bits(&s->gb, 4);
153	1/2 ✓ Branch 0 taken 642 times. ✗ Branch 1 not taken.	642	if (!(header->sample_rate = sample_rate_tab[header->fr_code]) \|\|
154	1/2 ✗ Branch 0 not taken. ✓ Branch 1 taken 642 times.	642	!sample_rate_tab[header->fr_code_orig]) {
155		✗	if (s->avctx)
156		✗	av_log(s->avctx, AV_LOG_ERROR, "Invalid frame rate code\n");
157		✗	return AVERROR_INVALIDDATA;
158			}
159
160		642	skip_bits_long(&s->gb, 88);
161	2/2 ✓ Branch 0 taken 3852 times. ✓ Branch 1 taken 642 times.	4494	for (int i = 0; i < header->nb_channels; i++)
162		3852	header->ch_size[i] = get_bits(&s->gb, 10);
163		642	header->mtd_ext_size = get_bits(&s->gb, 8);
164		642	header->meter_size = get_bits(&s->gb, 8);
165
166		642	skip_bits_long(&s->gb, 10 * header->nb_programs);
167	2/2 ✓ Branch 0 taken 3852 times. ✓ Branch 1 taken 642 times.	4494	for (int i = 0; i < header->nb_channels; i++) {
168		3852	header->rev_id[i] = get_bits(&s->gb, 4);
169		3852	skip_bits1(&s->gb);
170		3852	header->begin_gain[i] = get_bits(&s->gb, 10);
171		3852	header->end_gain[i] = get_bits(&s->gb, 10);
172			}
173
174	1/2 ✗ Branch 1 not taken. ✓ Branch 2 taken 642 times.	642	if (get_bits_left(&s->gb) < 0) {
175		✗	if (s->avctx)
176		✗	av_log(s->avctx, AV_LOG_ERROR, "Read past end of metadata\n");
177		✗	return AVERROR_INVALIDDATA;
178			}
179
180		642	return skip_input(s, mtd_size + 1);
181			}
182

Function (Line)	Call count	Block coverage
ff_dolby_e_convert_input (line 61)	called 4380 times, returned 4380 times	37.0%
ff_dolby_e_parse_header (line 98)	called 643 times, returned 643 times	67.0%
parse_key (line 49)	called 642 times, returned 642 times	71.0%
skip_input (line 38)	called 1284 times, returned 1284 times	75.0%