libmpdemux/stream_file.c

   1
   2 #include "config.h"
   3
   4 #include <stdio.h>
   5 #include <sys/types.h>
   6 #include <sys/stat.h>
   7 #include <fcntl.h>
   8 #include <unistd.h>
   9
  10 #include "mp_msg.h"
  11 #include "stream.h"
  12 #include "help_mp.h"
  13 #include "m_option.h"
  14 #include "m_struct.h"
  15
  16 static struct stream_priv_s {
  17   char* filename;
  18   char *filename2;
  19 } stream_priv_dflts = {
  20   NULL, NULL
  21 };
  22
  23 #define ST_OFF(f) M_ST_OFF(struct stream_priv_s,f)
  24 /// URL definition
  25 static m_option_t stream_opts_fields[] = {
  26   {"string", ST_OFF(filename), CONF_TYPE_STRING, 0, 0 ,0, NULL},
  27   {"filename", ST_OFF(filename2), CONF_TYPE_STRING, 0, 0 ,0, NULL},
  28   { NULL, NULL, 0, 0, 0, 0,  NULL }
  29 };
  30 static struct m_struct_st stream_opts = {
  31   "file",
  32   sizeof(struct stream_priv_s),
  33   &stream_priv_dflts,
  34   stream_opts_fields
  35 };
  36
  37 static int fill_buffer(stream_t *s, char* buffer, int max_len){
  38   int r = read(s->fd,buffer,max_len);
  39   return (r <= 0) ? -1 : r;
  40 }
  41
  42 static int write_buffer(stream_t *s, char* buffer, int len) {
  43   int r = write(s->fd,buffer,len);
  44   return (r <= 0) ? -1 : r;
  45 }
  46
  47 static int seek(stream_t *s,off_t newpos) {
  48   s->pos = newpos;
  49   if(lseek(s->fd,s->pos,SEEK_SET)<0) {
  50     s->eof=1;
  51     return 0;
  52   }
  53   return 1;
  54 }
  55
  56 static int seek_forward(stream_t *s,off_t newpos) {
  57   if(newpos<s->pos){
  58     mp_msg(MSGT_STREAM,MSGL_INFO,"Cannot seek backward in linear streams!\n");
  59     return 0;
  60   }
  61   while(s->pos<newpos){
  62     int len=s->fill_buffer(s,s->buffer,STREAM_BUFFER_SIZE);
  63     if(len<=0){ s->eof=1; s->buf_pos=s->buf_len=0; break; } // EOF
  64     s->buf_pos=0;
  65     s->buf_len=len;
  66     s->pos+=len;
  67   }
  68   return 1;
  69 }
  70
  71 static int open_f(stream_t *stream,int mode, void* opts, int* file_format) {
  72   int f;
  73   mode_t m = 0;
  74   off_t len;
  75   unsigned char *filename;
  76   struct stream_priv_s* p = (struct stream_priv_s*)opts;
  77
  78   if(mode == STREAM_READ)
  79     m = O_RDONLY;
  80   else if(mode == STREAM_WRITE)
  81     m = O_WRONLY;
  82   else {
  83     mp_msg(MSGT_OPEN,MSGL_ERR, "[file] Unknown open mode %d\n",mode);
  84     m_struct_free(&stream_opts,opts);
  85     return STREAM_UNSUPORTED;
  86   }
  87
  88   if(p->filename)
  89     filename = p->filename;
  90   else if(p->filename2)
  91     filename = p->filename2;
  92   else
  93     filename = NULL;
  94   if(!filename) {
  95     mp_msg(MSGT_OPEN,MSGL_ERR, "[file] No filename\n");
  96     m_struct_free(&stream_opts,opts);
  97     return STREAM_ERROR;
  98   }
  99
 100 #if defined(__CYGWIN__)|| defined(__MINGW32__)
 101   m |= O_BINARY;
 102 #endif
 103
 104   if(!strcmp(filename,"-")){
 105     if(mode == STREAM_READ) {
 106       // read from stdin
 107       mp_msg(MSGT_OPEN,MSGL_INFO,MSGTR_ReadSTDIN);
 108       f=0; // 0=stdin
 109 #ifdef __MINGW32__
 110           setmode(fileno(stdin),O_BINARY);
 111 #endif
 112     } else {
 113       mp_msg(MSGT_OPEN,MSGL_INFO,"Writing to stdout\n");
 114       f=1;
 115 #ifdef __MINGW32__
 116           setmode(fileno(stdout),O_BINARY);
 117 #endif
 118     }
 119   } else {
 120     f=open(filename,m);
 121     if(f<0) {
 122       mp_msg(MSGT_OPEN,MSGL_ERR,MSGTR_FileNotFound,filename);
 123       m_struct_free(&stream_opts,opts);
 124       return STREAM_ERROR;
 125     }
 126   }
 127
 128   len=lseek(f,0,SEEK_END); lseek(f,0,SEEK_SET);
 129 #ifdef __MINGW32__
 130   if(f==0 || len == -1) {
 131 #else
 132   if(len == -1) {
 133 #endif
 134     stream->seek = seek_forward;
 135     stream->type = STREAMTYPE_STREAM; // Must be move to STREAMTYPE_FILE
 136     stream->flags |= STREAM_SEEK_FW;
 137   } else if(len >= 0) {
 138     stream->seek = seek;
 139     stream->end_pos = len;
 140     stream->type = STREAMTYPE_FILE;
 141   }
 142
 143   mp_msg(MSGT_OPEN,MSGL_V,"[file] File size is %"PRId64" bytes\n", (int64_t)len);
 144
 145   stream->fd = f;
 146   stream->fill_buffer = fill_buffer;
 147   stream->write_buffer = write_buffer;
 148
 149   m_struct_free(&stream_opts,opts);
 150   return STREAM_OK;
 151 }
 152
 153 stream_info_t stream_info_file = {
 154   "File",
 155   "file",
 156   "Albeu",
 157   "based on the code from ??? (probably Arpi)",
 158   open_f,
 159   { "file", "", NULL },
 160   &stream_opts,
 161   1 // Urls are an option string
 162 };