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seek-test.c
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1 /*
2  * Copyright (c) 2003 Fabrice Bellard
3  * Copyright (c) 2007 Michael Niedermayer
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 <stdint.h>
23 #include <stdlib.h>
24 #include <stdio.h>
25 #include <string.h>
26 
27 #include "libavutil/common.h"
28 #include "libavutil/mathematics.h"
29 #include "libavformat/avformat.h"
30 
31 static char buffer[20];
32 
33 static const char *ret_str(int v)
34 {
35  switch (v) {
36  case AVERROR_EOF: return "-EOF";
37  case AVERROR(EIO): return "-EIO";
38  case AVERROR(ENOMEM): return "-ENOMEM";
39  case AVERROR(EINVAL): return "-EINVAL";
40  default:
41  snprintf(buffer, sizeof(buffer), "%2d", v);
42  return buffer;
43  }
44 }
45 
46 static void ts_str(char buffer[60], int64_t ts, AVRational base)
47 {
48  if (ts == AV_NOPTS_VALUE) {
49  strcpy(buffer, " NOPTS ");
50  return;
51  }
52  ts= av_rescale_q(ts, base, (AVRational){1, 1000000});
53  snprintf(buffer, 60, "%c%"PRId64".%06"PRId64"", ts<0 ? '-' : ' ', FFABS(ts)/1000000, FFABS(ts)%1000000);
54 }
55 
56 int main(int argc, char **argv)
57 {
58  const char *filename;
59  AVFormatContext *ic = NULL;
60  int i, ret, stream_id;
61  int j;
62  int64_t timestamp;
64  int64_t seekfirst = AV_NOPTS_VALUE;
65  int firstback=0;
66  int frame_count = 1;
67 
68  for(i=2; i<argc; i+=2){
69  if (!strcmp(argv[i], "-seekforw")){
70  seekfirst = atoi(argv[i+1]);
71  } else if(!strcmp(argv[i], "-seekback")){
72  seekfirst = atoi(argv[i+1]);
73  firstback = 1;
74  } else if(!strcmp(argv[i], "-frames")){
75  frame_count = atoi(argv[i+1]);
76  } else {
77  argc = 1;
78  }
79  }
80 
81  av_dict_set(&format_opts, "channels", "1", 0);
82  av_dict_set(&format_opts, "sample_rate", "22050", 0);
83 
84  /* initialize libavcodec, and register all codecs and formats */
86 
87  if (argc < 2) {
88  printf("usage: %s input_file\n"
89  "\n", argv[0]);
90  return 1;
91  }
92 
93  filename = argv[1];
94 
95  ret = avformat_open_input(&ic, filename, NULL, &format_opts);
96  av_dict_free(&format_opts);
97  if (ret < 0) {
98  fprintf(stderr, "cannot open %s\n", filename);
99  return 1;
100  }
101 
102  ret = avformat_find_stream_info(ic, NULL);
103  if (ret < 0) {
104  fprintf(stderr, "%s: could not find codec parameters\n", filename);
105  return 1;
106  }
107 
108  if(seekfirst != AV_NOPTS_VALUE){
109  if(firstback) avformat_seek_file(ic, -1, INT64_MIN, seekfirst, seekfirst, 0);
110  else avformat_seek_file(ic, -1, seekfirst, seekfirst, INT64_MAX, 0);
111  }
112  for(i=0; ; i++){
113  AVPacket pkt = { 0 };
114  AVStream *av_uninit(st);
115  char ts_buf[60];
116 
117  if(ret>=0){
118  for(j=0; j<frame_count; j++) {
119  ret= av_read_frame(ic, &pkt);
120  if(ret>=0){
121  char dts_buf[60];
122  st= ic->streams[pkt.stream_index];
123  ts_str(dts_buf, pkt.dts, st->time_base);
124  ts_str(ts_buf, pkt.pts, st->time_base);
125  printf("ret:%-10s st:%2d flags:%d dts:%s pts:%s pos:%7" PRId64 " size:%6d", ret_str(ret), pkt.stream_index, pkt.flags, dts_buf, ts_buf, pkt.pos, pkt.size);
126  av_free_packet(&pkt);
127  } else
128  printf("ret:%s", ret_str(ret)); // necessary to avoid trailing whitespace
129  printf("\n");
130  }
131  }
132 
133  if(i>25) break;
134 
135  stream_id= (i>>1)%(ic->nb_streams+1) - 1;
136  timestamp= (i*19362894167LL) % (4*AV_TIME_BASE) - AV_TIME_BASE;
137  if(stream_id>=0){
138  st= ic->streams[stream_id];
139  timestamp= av_rescale_q(timestamp, AV_TIME_BASE_Q, st->time_base);
140  }
141  //FIXME fully test the new seek API
142  if(i&1) ret = avformat_seek_file(ic, stream_id, INT64_MIN, timestamp, timestamp, 0);
143  else ret = avformat_seek_file(ic, stream_id, timestamp, timestamp, INT64_MAX, 0);
144  ts_str(ts_buf, timestamp, stream_id < 0 ? AV_TIME_BASE_Q : st->time_base);
145  printf("ret:%-10s st:%2d flags:%d ts:%s\n", ret_str(ret), stream_id, i&1, ts_buf);
146  }
147 
149 
150  return 0;
151 }