Media : implement MediaVideoDecoder.change()

Author: pquiring

native/common/ff_av_decoder.cpp

@@ -226,10 +226,11 @@ JNIEXPORT jint JNICALL Java_javaforce_media_MediaAudioDecoder_ngetSampleRate
   return ctx->audio_codec_ctx->sample_rate;
 }
 
-JNIEXPORT void JNICALL Java_javaforce_media_MediaAudioDecoder_nchange
+JNIEXPORT jboolean JNICALL Java_javaforce_media_MediaAudioDecoder_nchange
   (JNIEnv *e, jobject c, jlong ctxptr, jint chs, jint freq)
 {
   //TODO
+  return JNI_FALSE;
 }
 
 //video decoder codebase
@@ -420,10 +421,40 @@ JNIEXPORT jfloat JNICALL Java_javaforce_media_MediaVideoDecoder_ngetFrameRate
   return ctx->video_codec_ctx->framerate.num / ctx->video_codec_ctx->framerate.den;
 }
 
-JNIEXPORT void JNICALL Java_javaforce_media_MediaVideoDecoder_nchange
-  (JNIEnv *e, jobject c, jlong ctxptr, jint width, jint height)
+JNIEXPORT jboolean JNICALL Java_javaforce_media_MediaVideoDecoder_nchange
+  (JNIEnv *e, jobject c, jlong ctxptr, jint new_width, jint new_height)
 {
-  //TODO
-}
+  FFContext *ctx = castFFContext(e, c, ctxptr);
+  if (ctx == NULL) return JNI_FALSE;
+
+  if (ctx->video_stream == NULL) return JNI_FALSE;  //no video
+
+  if (ctx->rgb_video_dst_data[0] != NULL) {
+    (*_av_free)(ctx->rgb_video_dst_data[0]);
+    ctx->rgb_video_dst_data[0] = NULL;
+  }
 
+  ctx->rgb_video_dst_bufsize = (*_av_image_alloc)(ctx->rgb_video_dst_data, ctx->rgb_video_dst_linesize
+    , new_width, new_height, AV_PIX_FMT_BGRA, 1);
+  if (ctx->rgb_video_dst_bufsize < 0) {
+    printf("MediaDecoder:av_image_alloc() failed : %d\n", ctx->rgb_video_dst_bufsize);
+    return JNI_FALSE;
+  }
 
+  if (ctx->jvideo != NULL) {
+    e->DeleteGlobalRef(ctx->jvideo);
+  }
+  ctx->jvideo_length = ctx->rgb_video_dst_bufsize/4;
+  ctx->jvideo = (jintArray)ctx->e->NewGlobalRef(ctx->e->NewIntArray(ctx->jvideo_length));
+
+  if (ctx->sws_ctx != NULL) {
+    (*_sws_freeContext)(ctx->sws_ctx);
+    ctx->sws_ctx = NULL;
+  }
+
+  ctx->sws_ctx = (*_sws_getContext)(ctx->video_codec_ctx->width, ctx->video_codec_ctx->height, ctx->video_codec_ctx->pix_fmt
+    , new_width, new_height, AV_PIX_FMT_BGRA
+    , SWS_BILINEAR, NULL, NULL, NULL);
+
+  return JNI_TRUE;
+}

native/common/ffmpeg.cpp

@@ -643,7 +643,7 @@ static JNINativeMethod javaforce_media_MediaAudioDecoder[] = {
   {"ndecode", "(J[BII)[S", (void *)&Java_javaforce_media_MediaAudioDecoder_ndecode},
   {"ngetChannels", "(J)I", (void *)&Java_javaforce_media_MediaAudioDecoder_ngetChannels},
   {"ngetSampleRate", "(J)I", (void *)&Java_javaforce_media_MediaAudioDecoder_ngetSampleRate},
-  {"nchange", "(JII)V", (void *)&Java_javaforce_media_MediaAudioDecoder_nchange},
+  {"nchange", "(JII)Z", (void *)&Java_javaforce_media_MediaAudioDecoder_nchange},
 };
 
 static JNINativeMethod javaforce_media_MediaVideoDecoder[] = {
@@ -653,7 +653,7 @@ static JNINativeMethod javaforce_media_MediaVideoDecoder[] = {
   {"ngetWidth", "(J)I", (void *)&Java_javaforce_media_MediaVideoDecoder_ngetWidth},
   {"ngetHeight", "(J)I", (void *)&Java_javaforce_media_MediaVideoDecoder_ngetHeight},
   {"ngetFrameRate", "(J)F", (void *)&Java_javaforce_media_MediaVideoDecoder_ngetFrameRate},
-  {"nchange", "(JII)V", (void *)&Java_javaforce_media_MediaVideoDecoder_nchange},
+  {"nchange", "(JII)Z", (void *)&Java_javaforce_media_MediaVideoDecoder_nchange},
 };
 
 static JNINativeMethod javaforce_media_MediaAudioEncoder[] = {

src/javaforce/media/MediaAudioDecoder.java

@@ -45,9 +45,9 @@ public int getSampleRate() {
     if (ctx == 0) return -1;
     return ngetSampleRate(ctx);
   }
-  private native void nchange(long ctx, int chs, int freq);
+  private native boolean nchange(long ctx, int chs, int freq);
   /** Changes output chs/freq only.  All other fields ignored. */
-  public void change(CodecInfo info) {
-    nchange(ctx, info.chs, info.freq);
+  public boolean change(CodecInfo info) {
+    return nchange(ctx, info.chs, info.freq);
   }
 }

src/javaforce/media/MediaVideoDecoder.java

@@ -50,9 +50,9 @@ public float getFrameRate() {
     if (ctx == 0) return -1;
     return ngetFrameRate(ctx);
   }
-  private native void nchange(long ctx, int width, int height);
+  private native boolean nchange(long ctx, int width, int height);
   /** Changes output width/height only.  All other fields ignored. */
-  public void change(CodecInfo info) {
-    nchange(ctx, info.width, info.height);
+  public boolean change(CodecInfo info) {
+    return nchange(ctx, info.width, info.height);
   }
 }