Recherche avancée

Sur d’autres sites (6176)

• How to properly pass an asset FileDescriptor to FFmpeg using JNI in Android

  15 juillet 2014, par William Seemann

  I’m trying to retrieve metadata in Android using FFmpeg, JNI and a Java FileDescriptor and it isn’t’ working. I know FFmpeg supports the pipe protocol so I’m trying to emmulate : "cat test.mp3 | ffmpeg i pipe:0" programmatically. I use the following code to get a FileDescriptor from an asset bundled with the Android application :

  FileDescriptor fd = getContext().getAssets().openFd("test.mp3").getFileDescriptor();
  
  setDataSource(fd, 0, 0x7ffffffffffffffL); // native function, shown below

  Then, in my native (In C++) code I get the FileDescriptor by calling :

  static void wseemann_media_FFmpegMediaMetadataRetriever_setDataSource(JNIEnv *env, jobject thiz, jobject fileDescriptor, jlong offset, jlong length)
  
  {
  
      //...
  
  
  
      int fd = jniGetFDFromFileDescriptor(env, fileDescriptor); // function contents show below
  
  
  
      //...
  
  }
  
  
  
  // function contents
  
  static int jniGetFDFromFileDescriptor(JNIEnv * env, jobject fileDescriptor) {
  
      jint fd = -1;
  
      jclass fdClass = env->FindClass("java/io/FileDescriptor");
  
  
  
      if (fdClass != NULL) {
  
          jfieldID fdClassDescriptorFieldID = env->GetFieldID(fdClass, "descriptor", "I");
  
          if (fdClassDescriptorFieldID != NULL && fileDescriptor != NULL) {
  
              fd = env->GetIntField(fileDescriptor, fdClassDescriptorFieldID);
  
          }
  
      }
  
  
  
      return fd;
  
  }

  I then pass the file descriptor pipe # (In C) to FFmpeg :

  char path[256] = "";
  
  
  
  FILE *file = fdopen(fd, "rb");
  
  
  
  if (file && (fseek(file, offset, SEEK_SET) == 0)) {
  
      char str[20];
  
      sprintf(str, "pipe:%d", fd);
  
      strcat(path, str);
  
  }
  
  
  
  State *state = av_mallocz(sizeof(State));
  
  state->pFormatCtx = NULL;
  
  
  
  if (avformat_open_input(&amp;state->pFormatCtx, path, NULL, &amp;options) != 0) { // Note: path is in the format "pipe:<the fd="fd">"
  
      printf("Metadata could not be retrieved\n");
  
      *ps = NULL;
  
      return FAILURE;
  
  }
  
  
  
  if (avformat_find_stream_info(state->pFormatCtx, NULL) &lt; 0) {
  
      printf("Metadata could not be retrieved\n");
  
      avformat_close_input(&amp;state->pFormatCtx);
  
      *ps = NULL;
  
      return FAILURE;
  
  }
  
  
  
  // Find the first audio and video stream
  
  for (i = 0; i &lt; state->pFormatCtx->nb_streams; i++) {
  
      if (state->pFormatCtx->streams[i]->codec->codec_type == AVMEDIA_TYPE_VIDEO &amp;&amp; video_index &lt; 0) {
  
          video_index = i;
  
      }
  
  
  
      if (state->pFormatCtx->streams[i]->codec->codec_type == AVMEDIA_TYPE_AUDIO &amp;&amp; audio_index &lt; 0) {
  
          audio_index = i;
  
      }
  
  
  
      set_codec(state->pFormatCtx, i);
  
  }
  
  
  
  if (audio_index >= 0) {
  
      stream_component_open(state, audio_index);
  
  }
  
  
  
  if (video_index >= 0) {
  
      stream_component_open(state, video_index);
  
  }
  
  
  
  printf("Found metadata\n");
  
  AVDictionaryEntry *tag = NULL;
  
  while ((tag = av_dict_get(state->pFormatCtx->metadata, "", tag, AV_DICT_IGNORE_SUFFIX))) {
  
      printf("Key %s: \n", tag->key);
  
      printf("Value %s: \n", tag->value);
  
  }
  
  
  
  *ps = state;
  
  return SUCCESS;
  
  </the>

  My issue is avformat_open_input doesn’t fail but it also doesn’t let me retrieve any metadata or frames, The same code works if I use a regular file URI (e.g file ://sdcard/test.mp3) as the path. What am I doing wrong ? Thanks in advance.

  Note : if you would like to look at all of the code I’m trying to solve the issue in order to provide this functionality for my library : FFmpegMediaMetadataRetriever.

• x86 : checkasm : check for or handle missing cleanup after MMX instructions

  11 décembre 2015, par Janne Grunau

  x86 : checkasm : check for or handle missing cleanup after MMX instructions
  Not every asm routine is expected clear the MMX state after returning.
  
  It is however a requisite for testing floating point code in checkasm.
  
  Annotate functions requiring cleanup with declare_func_emms() and issue
  
  emms after the call. The remaining functions are checked for having  a
  
  cleared MMX state after return.
  

  • [DBH] tests/checkasm/checkasm.h
  • [DBH] tests/checkasm/h264pred.c
  • [DBH] tests/checkasm/h264qpel.c
  • [DBH] tests/checkasm/x86/checkasm.asm

• Merge commit ’8563f9887194b07c972c3475d6b51592d77f73f7’

  2 janvier 2016, par Hendrik Leppkes

  Merge commit ’8563f9887194b07c972c3475d6b51592d77f73f7’
  * commit ’8563f9887194b07c972c3475d6b51592d77f73f7’ :
  
    x86 : use emms after ff_int32_to_float_fmul_scalar_sse
  Merged-by : Hendrik Leppkes <h.leppkes@gmail.com>
  

  • [DH] libavcodec/x86/fmtconvert.asm