电视剧《白鹿原》昨晚停播片方：不清楚具体原因

Directory:	../../../ffmpeg/
File:	src/libavcodec/mpegaudiodecheader.c
Date:	2025-08-04 00:43:16

	Exec	Total	Coverage
Lines:	67	68	98.5%
Functions:	2	2	100.0%
Branches:	20	22	90.9%

  
      Line
      Branch
      Exec
      Source
    
      /*
    
       * MPEG Audio header decoder
    
       * Copyright (c) 2001, 2002 Fabrice Bellard
    
       *
    
       * 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
    
       * MPEG Audio header decoder.
    
       */
    
      #include "libavutil/macros.h"
    
      #include "mpegaudio.h"
    
      #include "mpegaudiodata.h"
    
      #include "mpegaudiodecheader.h"
    
      364255769
      int avpriv_mpegaudio_decode_header(MPADecodeHeader *s, uint32_t header)
    
      {
    
          int sample_rate, frame_size, mpeg25, padding;
    
          int sample_rate_index, bitrate_index;
    
          int ret;
    
      364255769
          ret = ff_mpa_check_header(header);
    
        2/2✓ Branch 0 taken 364055187 times.
✓ Branch 1 taken 200582 times.

      364255769
          if (ret < 0)
    
      364055187
              return ret;
    
        2/2✓ Branch 0 taken 176801 times.
✓ Branch 1 taken 23781 times.

      200582
          if (header & (1<<20)) {
    
      176801
              s->lsf = (header & (1<<19)) ? 0 : 1;
    
      176801
              mpeg25 = 0;
    
          } else {
    
      23781
              s->lsf = 1;
    
      23781
              mpeg25 = 1;
    
          }
    
      200582
          s->layer = 4 - ((header >> 17) & 3);
    
          /* extract frequency */
    
      200582
          sample_rate_index = (header >> 10) & 3;
    
        1/2✗ Branch 0 not taken.
✓ Branch 1 taken 200582 times.

      200582
          if (sample_rate_index >= FF_ARRAY_ELEMS(ff_mpa_freq_tab))
    
      ✗
              sample_rate_index = 0;
    
      200582
          sample_rate = ff_mpa_freq_tab[sample_rate_index] >> (s->lsf + mpeg25);
    
      200582
          sample_rate_index += 3 * (s->lsf + mpeg25);
    
      200582
          s->sample_rate_index = sample_rate_index;
    
      200582
          s->error_protection = ((header >> 16) & 1) ^ 1;
    
      200582
          s->sample_rate = sample_rate;
    
      200582
          bitrate_index = (header >> 12) & 0xf;
    
      200582
          padding = (header >> 9) & 1;
    
          //extension = (header >> 8) & 1;
    
      200582
          s->mode = (header >> 6) & 3;
    
      200582
          s->mode_ext = (header >> 4) & 3;
    
          //copyright = (header >> 3) & 1;
    
          //original = (header >> 2) & 1;
    
          //emphasis = header & 3;
    
        2/2✓ Branch 0 taken 82172 times.
✓ Branch 1 taken 118410 times.

      200582
          if (s->mode == MPA_MONO)
    
      82172
              s->nb_channels = 1;
    
          else
    
      118410
              s->nb_channels = 2;
    
        2/2✓ Branch 0 taken 98929 times.
✓ Branch 1 taken 101653 times.

      200582
          if (bitrate_index != 0) {
    
      98929
              frame_size = ff_mpa_bitrate_tab[s->lsf][s->layer - 1][bitrate_index];
    
      98929
              s->bit_rate = frame_size * 1000;
    
        3/3✓ Branch 0 taken 45290 times.
✓ Branch 1 taken 28534 times.
✓ Branch 2 taken 25105 times.

      98929
              switch(s->layer) {
    
      45290
              case 1:
    
      45290
                  frame_size = (frame_size * 12000) / sample_rate;
    
      45290
                  frame_size = (frame_size + padding) * 4;
    
      45290
                  break;
    
      28534
              case 2:
    
      28534
                  frame_size = (frame_size * 144000) / sample_rate;
    
      28534
                  frame_size += padding;
    
      28534
                  break;
    
      25105
              default:
    
              case 3:
    
      25105
                  frame_size = (frame_size * 144000) / (sample_rate << s->lsf);
    
      25105
                  frame_size += padding;
    
      25105
                  break;
    
              }
    
      98929
              s->frame_size = frame_size;
    
          } else {
    
              /* if no frame size computed, signal it */
    
      101653
              return 1;
    
          }
    
      #if defined(DEBUG)
    
          ff_dlog(NULL, "layer%d, %d Hz, %d kbits/s, ",
    
                 s->layer, s->sample_rate, s->bit_rate);
    
          if (s->nb_channels == 2) {
    
              if (s->layer == 3) {
    
                  if (s->mode_ext & MODE_EXT_MS_STEREO)
    
                      ff_dlog(NULL, "ms-");
    
                  if (s->mode_ext & MODE_EXT_I_STEREO)
    
                      ff_dlog(NULL, "i-");
    
              }
    
              ff_dlog(NULL, "stereo");
    
          } else {
    
              ff_dlog(NULL, "mono");
    
          }
    
          ff_dlog(NULL, "\n");
    
      #endif
    
      98929
          return 0;
    
      }
    
      285604
      int ff_mpa_decode_header(uint32_t head, int *sample_rate, int *channels, int *frame_size, int *bit_rate, enum AVCodecID *codec_id)
    
      {
    
      285604
          MPADecodeHeader s1, *s = &s1;
    
        2/2✓ Branch 1 taken 267280 times.
✓ Branch 2 taken 18324 times.

      285604
          if (avpriv_mpegaudio_decode_header(s, head) != 0) {
    
      267280
              return -1;
    
          }
    
        3/3✓ Branch 0 taken 68 times.
✓ Branch 1 taken 10430 times.
✓ Branch 2 taken 7826 times.

      18324
          switch(s->layer) {
    
      68
          case 1:
    
      68
              *codec_id = AV_CODEC_ID_MP1;
    
      68
              *frame_size = 384;
    
      68
              break;
    
      10430
          case 2:
    
      10430
              *codec_id = AV_CODEC_ID_MP2;
    
      10430
              *frame_size = 1152;
    
      10430
              break;
    
      7826
          default:
    
          case 3:
    
        1/2✓ Branch 0 taken 7826 times.
✗ Branch 1 not taken.

      7826
              if (*codec_id != AV_CODEC_ID_MP3ADU)
    
      7826
                  *codec_id = AV_CODEC_ID_MP3;
    
        2/2✓ Branch 0 taken 260 times.
✓ Branch 1 taken 7566 times.

      7826
              if (s->lsf)
    
      260
                  *frame_size = 576;
    
              else
    
      7566
                  *frame_size = 1152;
    
      7826
              break;
    
          }
    
      18324
          *sample_rate = s->sample_rate;
    
      18324
          *channels = s->nb_channels;
    
      18324
          *bit_rate = s->bit_rate;
    
      18324
          return s->frame_size;
    
      }

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Line	Branch	Exec	Source
1			/*
2			* MPEG Audio header decoder
3			* Copyright (c) 2001, 2002 Fabrice Bellard
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			/**
23			* @file
24			* MPEG Audio header decoder.
25			*/
26
27			#include "libavutil/macros.h"
28
29			#include "mpegaudio.h"
30			#include "mpegaudiodata.h"
31			#include "mpegaudiodecheader.h"
32
33
34		364255769	int avpriv_mpegaudio_decode_header(MPADecodeHeader *s, uint32_t header)
35			{
36			int sample_rate, frame_size, mpeg25, padding;
37			int sample_rate_index, bitrate_index;
38			int ret;
39
40		364255769	ret = ff_mpa_check_header(header);
41	2/2 ✓ Branch 0 taken 364055187 times. ✓ Branch 1 taken 200582 times.	364255769	if (ret < 0)
42		364055187	return ret;
43
44	2/2 ✓ Branch 0 taken 176801 times. ✓ Branch 1 taken 23781 times.	200582	if (header & (1<<20)) {
45		176801	s->lsf = (header & (1<<19)) ? 0 : 1;
46		176801	mpeg25 = 0;
47			} else {
48		23781	s->lsf = 1;
49		23781	mpeg25 = 1;
50			}
51
52		200582	s->layer = 4 - ((header >> 17) & 3);
53			/* extract frequency */
54		200582	sample_rate_index = (header >> 10) & 3;
55	1/2 ✗ Branch 0 not taken. ✓ Branch 1 taken 200582 times.	200582	if (sample_rate_index >= FF_ARRAY_ELEMS(ff_mpa_freq_tab))
56		✗	sample_rate_index = 0;
57		200582	sample_rate = ff_mpa_freq_tab[sample_rate_index] >> (s->lsf + mpeg25);
58		200582	sample_rate_index += 3 * (s->lsf + mpeg25);
59		200582	s->sample_rate_index = sample_rate_index;
60		200582	s->error_protection = ((header >> 16) & 1) ^ 1;
61		200582	s->sample_rate = sample_rate;
62
63		200582	bitrate_index = (header >> 12) & 0xf;
64		200582	padding = (header >> 9) & 1;
65			//extension = (header >> 8) & 1;
66		200582	s->mode = (header >> 6) & 3;
67		200582	s->mode_ext = (header >> 4) & 3;
68			//copyright = (header >> 3) & 1;
69			//original = (header >> 2) & 1;
70			//emphasis = header & 3;
71
72	2/2 ✓ Branch 0 taken 82172 times. ✓ Branch 1 taken 118410 times.	200582	if (s->mode == MPA_MONO)
73		82172	s->nb_channels = 1;
74			else
75		118410	s->nb_channels = 2;
76
77	2/2 ✓ Branch 0 taken 98929 times. ✓ Branch 1 taken 101653 times.	200582	if (bitrate_index != 0) {
78		98929	frame_size = ff_mpa_bitrate_tab[s->lsf][s->layer - 1][bitrate_index];
79		98929	s->bit_rate = frame_size * 1000;
80	3/3 ✓ Branch 0 taken 45290 times. ✓ Branch 1 taken 28534 times. ✓ Branch 2 taken 25105 times.	98929	switch(s->layer) {
81		45290	case 1:
82		45290	frame_size = (frame_size * 12000) / sample_rate;
83		45290	frame_size = (frame_size + padding) * 4;
84		45290	break;
85		28534	case 2:
86		28534	frame_size = (frame_size * 144000) / sample_rate;
87		28534	frame_size += padding;
88		28534	break;
89		25105	default:
90			case 3:
91		25105	frame_size = (frame_size * 144000) / (sample_rate << s->lsf);
92		25105	frame_size += padding;
93		25105	break;
94			}
95		98929	s->frame_size = frame_size;
96			} else {
97			/* if no frame size computed, signal it */
98		101653	return 1;
99			}
100
101			#if defined(DEBUG)
102			ff_dlog(NULL, "layer%d, %d Hz, %d kbits/s, ",
103			s->layer, s->sample_rate, s->bit_rate);
104			if (s->nb_channels == 2) {
105			if (s->layer == 3) {
106			if (s->mode_ext & MODE_EXT_MS_STEREO)
107			ff_dlog(NULL, "ms-");
108			if (s->mode_ext & MODE_EXT_I_STEREO)
109			ff_dlog(NULL, "i-");
110			}
111			ff_dlog(NULL, "stereo");
112			} else {
113			ff_dlog(NULL, "mono");
114			}
115			ff_dlog(NULL, "\n");
116			#endif
117		98929	return 0;
118			}
119
120		285604	int ff_mpa_decode_header(uint32_t head, int sample_rate, int channels, int frame_size, int bit_rate, enum AVCodecID *codec_id)
121			{
122		285604	MPADecodeHeader s1, *s = &s1;
123
124	2/2 ✓ Branch 1 taken 267280 times. ✓ Branch 2 taken 18324 times.	285604	if (avpriv_mpegaudio_decode_header(s, head) != 0) {
125		267280	return -1;
126			}
127
128	3/3 ✓ Branch 0 taken 68 times. ✓ Branch 1 taken 10430 times. ✓ Branch 2 taken 7826 times.	18324	switch(s->layer) {
129		68	case 1:
130		68	*codec_id = AV_CODEC_ID_MP1;
131		68	*frame_size = 384;
132		68	break;
133		10430	case 2:
134		10430	*codec_id = AV_CODEC_ID_MP2;
135		10430	*frame_size = 1152;
136		10430	break;
137		7826	default:
138			case 3:
139	1/2 ✓ Branch 0 taken 7826 times. ✗ Branch 1 not taken.	7826	if (*codec_id != AV_CODEC_ID_MP3ADU)
140		7826	*codec_id = AV_CODEC_ID_MP3;
141	2/2 ✓ Branch 0 taken 260 times. ✓ Branch 1 taken 7566 times.	7826	if (s->lsf)
142		260	*frame_size = 576;
143			else
144		7566	*frame_size = 1152;
145		7826	break;
146			}
147
148		18324	*sample_rate = s->sample_rate;
149		18324	*channels = s->nb_channels;
150		18324	*bit_rate = s->bit_rate;
151		18324	return s->frame_size;
152			}
153

Function (Line)	Call count	Block coverage
avpriv_mpegaudio_decode_header (line 34)	called 364255769 times, returned 364255769 times	95.0%
ff_mpa_decode_header (line 120)	called 285604 times, returned 285604 times	100.0%