跨境电商如何推动高质量发展——专访商务部研究院电子商务研究所所长张莉

  
      Line
      Branch
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      Source
    
      /*
    
       * MicroDVD subtitle demuxer
    
       * Copyright (c) 2010  Aurelien Jacobs <aurel@gnuage.org>
    
       * Copyright (c) 2012  Clément B?sch <u pkh me>
    
       *
    
       * 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 "avformat.h"
    
      #include "demux.h"
    
      #include "internal.h"
    
      #include "subtitles.h"
    
      #include "libavutil/intreadwrite.h"
    
      #include "libavutil/opt.h"
    
      #define MAX_LINESIZE 2048
    
      typedef struct {
    
          const AVClass *class;
    
          FFDemuxSubtitlesQueue q;
    
          AVRational frame_rate;
    
      } MicroDVDContext;
    
      7252
      static int microdvd_probe(const AVProbeData *p)
    
      {
    
          unsigned char c;
    
      7252
          const uint8_t *ptr = p->buf;
    
          int i;
    
        2/2✓ Branch 0 taken 9 times.
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      7252
          if (AV_RB24(ptr) == 0xEFBBBF)
    
      9
              ptr += 3;  /* skip UTF-8 BOM */
    
        2/2✓ Branch 0 taken 7258 times.
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      7261
          for (i=0; i<3; i++) {
    
        2/2✓ Branch 0 taken 7254 times.
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      7258
              if (sscanf(ptr, "{%*d}{}%c",     &c) != 1 &&
    
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      7254
                  sscanf(ptr, "{%*d}{%*d}%c",  &c) != 1 &&
    
        2/2✓ Branch 0 taken 7249 times.
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      7251
                  sscanf(ptr, "{DEFAULT}{}%c", &c) != 1)
    
      7249
                  return 0;
    
      9
              ptr += ff_subtitles_next_line(ptr);
    
          }
    
      3
          return AVPROBE_SCORE_MAX;
    
      }
    
      70
      static int64_t get_pts(const char *buf)
    
      {
    
          int frame;
    
          char c;
    
        1/2✓ Branch 0 taken 70 times.
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      70
          if (sscanf(buf, "{%d}{%c", &frame, &c) == 2)
    
      70
              return frame;
    
      ✗
          return AV_NOPTS_VALUE;
    
      }
    
      70
      static int64_t get_duration(const char *buf)
    
      {
    
          int frame_start, frame_end;
    
        2/2✓ Branch 0 taken 60 times.
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      70
          if (sscanf(buf, "{%d}{%d}", &frame_start, &frame_end) == 2)
    
      60
              return frame_end - (int64_t)frame_start;
    
      10
          return -1;
    
      }
    
      static const char *bom = "\xEF\xBB\xBF";
    
      3
      static int microdvd_read_header(AVFormatContext *s)
    
      {
    
      3
          AVRational pts_info = (AVRational){ 2997, 125 };  /* default: 23.976 fps */
    
      3
          MicroDVDContext *microdvd = s->priv_data;
    
      3
          AVStream *st = avformat_new_stream(s, NULL);
    
      3
          int i = 0, ret;
    
          char line_buf[MAX_LINESIZE];
    
      3
          int has_real_fps = 0;
    
        1/2✗ Branch 0 not taken.
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      3
          if (!st)
    
      ✗
              return AVERROR(ENOMEM);
    
        1/2✓ Branch 1 taken 77 times.
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      77
          while (!avio_feof(s->pb)) {
    
              char *p;
    
              AVPacket *sub;
    
      77
              int64_t pos = avio_tell(s->pb);
    
      77
              int len = ff_get_line(s->pb, line_buf, sizeof(line_buf));
    
      77
              char *line = line_buf;
    
              int64_t pts;
    
        1/2✗ Branch 0 not taken.
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      77
              if (!strncmp(line, bom, 3))
    
      ✗
                  line += 3;
    
      77
              p = line;
    
        2/2✓ Branch 0 taken 3 times.
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      77
              if (!len)
    
      3
                  break;
    
      74
              line[strcspn(line, "\r\n")] = 0;
    
        1/2✗ Branch 0 not taken.
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      74
              if (!*p)
    
      ✗
                  continue;
    
        2/2✓ Branch 0 taken 9 times.
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      74
              if (i++ < 3) {
    
                  int frame;
    
                  double fps;
    
                  char c;
    
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✓ Branch 1 taken 2 times.

      9
                  if ((sscanf(line, "{%d}{}%6lf",    &frame, &fps) == 2 ||
    
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      7
                       sscanf(line, "{%d}{%*d}%6lf", &frame, &fps) == 2)
    
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      2
                      && frame <= 1 && fps > 3 && fps < 100) {
    
      2
                      pts_info = av_d2q(fps, 100000);
    
      2
                      has_real_fps = 1;
    
      4
                      continue;
    
                  }
    
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      7
                  if (!st->codecpar->extradata && sscanf(line, "{DEFAULT}{}%c", &c) == 1) {
    
      2
                      int size = strlen(line + 11);
    
      2
                      ret = ff_alloc_extradata(st->codecpar, size);
    
        1/2✗ Branch 0 not taken.
✓ Branch 1 taken 2 times.

      2
                      if (ret < 0)
    
      ✗
                          return ret;
    
      2
                      memcpy(st->codecpar->extradata, line + 11, size);
    
      2
                      continue;
    
                  }
    
              }
    
      #define SKIP_FRAME_ID                                       \
    
          p = strchr(p, '}');                                     \
    
          if (!p) {                                               \
    
              av_log(s, AV_LOG_WARNING, "Invalid event \"%s\""    \
    
                     " at line %d\n", line, i);                   \
    
              continue;                                           \
    
          }                                                       \
    
          p++
    
        1/2✗ Branch 0 not taken.
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      70
              SKIP_FRAME_ID;
    
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      70
              SKIP_FRAME_ID;
    
        1/2✗ Branch 0 not taken.
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      70
              if (!*p)
    
      ✗
                  continue;
    
      70
              pts = get_pts(line);
    
        1/2✗ Branch 0 not taken.
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      70
              if (pts == AV_NOPTS_VALUE)
    
      ✗
                  continue;
    
      70
              sub = ff_subtitles_queue_insert(&microdvd->q, p, strlen(p), 0);
    
        1/2✗ Branch 0 not taken.
✓ Branch 1 taken 70 times.

      70
              if (!sub)
    
      ✗
                  return AVERROR(ENOMEM);
    
      70
              sub->pos = pos;
    
      70
              sub->pts = pts;
    
      70
              sub->duration = get_duration(line);
    
          }
    
      3
          ff_subtitles_queue_finalize(s, &microdvd->q);
    
        2/2✓ Branch 0 taken 2 times.
✓ Branch 1 taken 1 times.

      3
          if (has_real_fps) {
    
              /* export the FPS info only if set in the file */
    
      2
              microdvd->frame_rate = pts_info;
    
        1/2✗ Branch 0 not taken.
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      1
          } else if (microdvd->frame_rate.num) {
    
              /* fallback on user specified frame rate */
    
      ✗
              pts_info = microdvd->frame_rate;
    
          }
    
      3
          avpriv_set_pts_info(st, 64, pts_info.den, pts_info.num);
    
      3
          st->codecpar->codec_type = AVMEDIA_TYPE_SUBTITLE;
    
      3
          st->codecpar->codec_id   = AV_CODEC_ID_MICRODVD;
    
      3
          return 0;
    
      }
    
      73
      static int microdvd_read_packet(AVFormatContext *s, AVPacket *pkt)
    
      {
    
      73
          MicroDVDContext *microdvd = s->priv_data;
    
      73
          return ff_subtitles_queue_read_packet(&microdvd->q, pkt);
    
      }
    
      ✗
      static int microdvd_read_seek(AVFormatContext *s, int stream_index,
    
                                   int64_t min_ts, int64_t ts, int64_t max_ts, int flags)
    
      {
    
      ✗
          MicroDVDContext *microdvd = s->priv_data;
    
      ✗
          return ff_subtitles_queue_seek(&microdvd->q, s, stream_index,
    
                                         min_ts, ts, max_ts, flags);
    
      }
    
      3
      static int microdvd_read_close(AVFormatContext *s)
    
      {
    
      3
          MicroDVDContext *microdvd = s->priv_data;
    
      3
          ff_subtitles_queue_clean(&microdvd->q);
    
      3
          return 0;
    
      }
    
      #define OFFSET(x) offsetof(MicroDVDContext, x)
    
      #define SD AV_OPT_FLAG_SUBTITLE_PARAM|AV_OPT_FLAG_DECODING_PARAM
    
      static const AVOption microdvd_options[] = {
    
          { "subfps", "set the movie frame rate fallback", OFFSET(frame_rate), AV_OPT_TYPE_RATIONAL, {.dbl=0}, 0, INT_MAX, SD },
    
          { NULL }
    
      };
    
      static const AVClass microdvd_class = {
    
          .class_name = "microdvddec",
    
          .item_name  = av_default_item_name,
    
          .option     = microdvd_options,
    
          .version    = LIBAVUTIL_VERSION_INT,
    
      };
    
      const FFInputFormat ff_microdvd_demuxer = {
    
          .p.name         = "microdvd",
    
          .p.long_name    = NULL_IF_CONFIG_SMALL("MicroDVD subtitle format"),
    
          .p.priv_class   = &microdvd_class,
    
          .priv_data_size = sizeof(MicroDVDContext),
    
          .flags_internal = FF_INFMT_FLAG_INIT_CLEANUP,
    
          .read_probe     = microdvd_probe,
    
          .read_header    = microdvd_read_header,
    
          .read_packet    = microdvd_read_packet,
    
          .read_seek2     = microdvd_read_seek,
    
          .read_close     = microdvd_read_close,
    
      };

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Line	Branch	Exec	Source
1			/*
2			* MicroDVD subtitle demuxer
3			* Copyright (c) 2010 Aurelien Jacobs <aurel@gnuage.org>
4			* Copyright (c) 2012 Clément B?sch <u pkh me>
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 "avformat.h"
24			#include "demux.h"
25			#include "internal.h"
26			#include "subtitles.h"
27			#include "libavutil/intreadwrite.h"
28			#include "libavutil/opt.h"
29
30			#define MAX_LINESIZE 2048
31
32
33			typedef struct {
34			const AVClass *class;
35			FFDemuxSubtitlesQueue q;
36			AVRational frame_rate;
37			} MicroDVDContext;
38
39
40		7252	static int microdvd_probe(const AVProbeData *p)
41			{
42			unsigned char c;
43		7252	const uint8_t *ptr = p->buf;
44			int i;
45
46	2/2 ✓ Branch 0 taken 9 times. ✓ Branch 1 taken 7243 times.	7252	if (AV_RB24(ptr) == 0xEFBBBF)
47		9	ptr += 3; /* skip UTF-8 BOM */
48
49	2/2 ✓ Branch 0 taken 7258 times. ✓ Branch 1 taken 3 times.	7261	for (i=0; i<3; i++) {
50	2/2 ✓ Branch 0 taken 7254 times. ✓ Branch 1 taken 4 times.	7258	if (sscanf(ptr, "{%*d}{}%c", &c) != 1 &&
51	2/2 ✓ Branch 0 taken 7251 times. ✓ Branch 1 taken 3 times.	7254	sscanf(ptr, "{%d}{%d}%c", &c) != 1 &&
52	2/2 ✓ Branch 0 taken 7249 times. ✓ Branch 1 taken 2 times.	7251	sscanf(ptr, "{DEFAULT}{}%c", &c) != 1)
53		7249	return 0;
54		9	ptr += ff_subtitles_next_line(ptr);
55			}
56		3	return AVPROBE_SCORE_MAX;
57			}
58
59		70	static int64_t get_pts(const char *buf)
60			{
61			int frame;
62			char c;
63
64	1/2 ✓ Branch 0 taken 70 times. ✗ Branch 1 not taken.	70	if (sscanf(buf, "{%d}{%c", &frame, &c) == 2)
65		70	return frame;
66		✗	return AV_NOPTS_VALUE;
67			}
68
69		70	static int64_t get_duration(const char *buf)
70			{
71			int frame_start, frame_end;
72
73	2/2 ✓ Branch 0 taken 60 times. ✓ Branch 1 taken 10 times.	70	if (sscanf(buf, "{%d}{%d}", &frame_start, &frame_end) == 2)
74		60	return frame_end - (int64_t)frame_start;
75		10	return -1;
76			}
77
78			static const char *bom = "\xEF\xBB\xBF";
79
80		3	static int microdvd_read_header(AVFormatContext *s)
81			{
82		3	AVRational pts_info = (AVRational){ 2997, 125 }; /* default: 23.976 fps */
83		3	MicroDVDContext *microdvd = s->priv_data;
84		3	AVStream *st = avformat_new_stream(s, NULL);
85		3	int i = 0, ret;
86			char line_buf[MAX_LINESIZE];
87		3	int has_real_fps = 0;
88
89	1/2 ✗ Branch 0 not taken. ✓ Branch 1 taken 3 times.	3	if (!st)
90		✗	return AVERROR(ENOMEM);
91
92	1/2 ✓ Branch 1 taken 77 times. ✗ Branch 2 not taken.	77	while (!avio_feof(s->pb)) {
93			char *p;
94			AVPacket *sub;
95		77	int64_t pos = avio_tell(s->pb);
96		77	int len = ff_get_line(s->pb, line_buf, sizeof(line_buf));
97		77	char *line = line_buf;
98			int64_t pts;
99
100	1/2 ✗ Branch 0 not taken. ✓ Branch 1 taken 77 times.	77	if (!strncmp(line, bom, 3))
101		✗	line += 3;
102		77	p = line;
103
104	2/2 ✓ Branch 0 taken 3 times. ✓ Branch 1 taken 74 times.	77	if (!len)
105		3	break;
106		74	line[strcspn(line, "\r\n")] = 0;
107	1/2 ✗ Branch 0 not taken. ✓ Branch 1 taken 74 times.	74	if (!*p)
108		✗	continue;
109	2/2 ✓ Branch 0 taken 9 times. ✓ Branch 1 taken 65 times.	74	if (i++ < 3) {
110			int frame;
111			double fps;
112			char c;
113
114	2/2 ✓ Branch 0 taken 7 times. ✓ Branch 1 taken 2 times.	9	if ((sscanf(line, "{%d}{}%6lf", &frame, &fps) == 2 \|\|
115	1/2 ✗ Branch 0 not taken. ✓ Branch 1 taken 7 times.	7	sscanf(line, "{%d}{%*d}%6lf", &frame, &fps) == 2)
116	3/6 ✓ Branch 0 taken 2 times. ✗ Branch 1 not taken. ✓ Branch 2 taken 2 times. ✗ Branch 3 not taken. ✓ Branch 4 taken 2 times. ✗ Branch 5 not taken.	2	&& frame <= 1 && fps > 3 && fps < 100) {
117		2	pts_info = av_d2q(fps, 100000);
118		2	has_real_fps = 1;
119		4	continue;
120			}
121	4/4 ✓ Branch 0 taken 5 times. ✓ Branch 1 taken 2 times. ✓ Branch 2 taken 2 times. ✓ Branch 3 taken 3 times.	7	if (!st->codecpar->extradata && sscanf(line, "{DEFAULT}{}%c", &c) == 1) {
122		2	int size = strlen(line + 11);
123		2	ret = ff_alloc_extradata(st->codecpar, size);
124	1/2 ✗ Branch 0 not taken. ✓ Branch 1 taken 2 times.	2	if (ret < 0)
125		✗	return ret;
126		2	memcpy(st->codecpar->extradata, line + 11, size);
127		2	continue;
128			}
129			}
130			#define SKIP_FRAME_ID \
131			p = strchr(p, '}'); \
132			if (!p) { \
133			av_log(s, AV_LOG_WARNING, "Invalid event \"%s\"" \
134			" at line %d\n", line, i); \
135			continue; \
136			} \
137			p++
138	1/2 ✗ Branch 0 not taken. ✓ Branch 1 taken 70 times.	70	SKIP_FRAME_ID;
139	1/2 ✗ Branch 0 not taken. ✓ Branch 1 taken 70 times.	70	SKIP_FRAME_ID;
140	1/2 ✗ Branch 0 not taken. ✓ Branch 1 taken 70 times.	70	if (!*p)
141		✗	continue;
142		70	pts = get_pts(line);
143	1/2 ✗ Branch 0 not taken. ✓ Branch 1 taken 70 times.	70	if (pts == AV_NOPTS_VALUE)
144		✗	continue;
145		70	sub = ff_subtitles_queue_insert(&microdvd->q, p, strlen(p), 0);
146	1/2 ✗ Branch 0 not taken. ✓ Branch 1 taken 70 times.	70	if (!sub)
147		✗	return AVERROR(ENOMEM);
148		70	sub->pos = pos;
149		70	sub->pts = pts;
150		70	sub->duration = get_duration(line);
151			}
152		3	ff_subtitles_queue_finalize(s, &microdvd->q);
153	2/2 ✓ Branch 0 taken 2 times. ✓ Branch 1 taken 1 times.	3	if (has_real_fps) {
154			/* export the FPS info only if set in the file */
155		2	microdvd->frame_rate = pts_info;
156	1/2 ✗ Branch 0 not taken. ✓ Branch 1 taken 1 times.	1	} else if (microdvd->frame_rate.num) {
157			/* fallback on user specified frame rate */
158		✗	pts_info = microdvd->frame_rate;
159			}
160		3	avpriv_set_pts_info(st, 64, pts_info.den, pts_info.num);
161		3	st->codecpar->codec_type = AVMEDIA_TYPE_SUBTITLE;
162		3	st->codecpar->codec_id = AV_CODEC_ID_MICRODVD;
163		3	return 0;
164			}
165
166		73	static int microdvd_read_packet(AVFormatContext s, AVPacket pkt)
167			{
168		73	MicroDVDContext *microdvd = s->priv_data;
169		73	return ff_subtitles_queue_read_packet(&microdvd->q, pkt);
170			}
171
172		✗	static int microdvd_read_seek(AVFormatContext *s, int stream_index,
173			int64_t min_ts, int64_t ts, int64_t max_ts, int flags)
174			{
175		✗	MicroDVDContext *microdvd = s->priv_data;
176		✗	return ff_subtitles_queue_seek(&microdvd->q, s, stream_index,
177			min_ts, ts, max_ts, flags);
178			}
179
180		3	static int microdvd_read_close(AVFormatContext *s)
181			{
182		3	MicroDVDContext *microdvd = s->priv_data;
183		3	ff_subtitles_queue_clean(&microdvd->q);
184		3	return 0;
185			}
186
187
188			#define OFFSET(x) offsetof(MicroDVDContext, x)
189			#define SD AV_OPT_FLAG_SUBTITLE_PARAM\|AV_OPT_FLAG_DECODING_PARAM
190			static const AVOption microdvd_options[] = {
191			{ "subfps", "set the movie frame rate fallback", OFFSET(frame_rate), AV_OPT_TYPE_RATIONAL, {.dbl=0}, 0, INT_MAX, SD },
192			{ NULL }
193			};
194
195			static const AVClass microdvd_class = {
196			.class_name = "microdvddec",
197			.item_name = av_default_item_name,
198			.option = microdvd_options,
199			.version = LIBAVUTIL_VERSION_INT,
200			};
201
202			const FFInputFormat ff_microdvd_demuxer = {
203			.p.name = "microdvd",
204			.p.long_name = NULL_IF_CONFIG_SMALL("MicroDVD subtitle format"),
205			.p.priv_class = &microdvd_class,
206			.priv_data_size = sizeof(MicroDVDContext),
207			.flags_internal = FF_INFMT_FLAG_INIT_CLEANUP,
208			.read_probe = microdvd_probe,
209			.read_header = microdvd_read_header,
210			.read_packet = microdvd_read_packet,
211			.read_seek2 = microdvd_read_seek,
212			.read_close = microdvd_read_close,
213			};
214