Treat AVERROR_INVALIDDATA as non-fatal

Also configure the FFmpeg context to ignore errors as far as possible (this
appears to have an effect only for certain decoders).

Issue: #5293
PiperOrigin-RevId: 227851397

RELEASENOTES.md

@@ -4,6 +4,8 @@
 
 * IMA extension: Clear ads loader listeners on release
   ([#4114](https://github.com/google/ExoPlayer/issues/4114)).
+* FFmpeg extension: Treat invalid data errors as non-fatal to match the behavior
+  of MediaCodec ([#5293](https://github.com/google/ExoPlayer/issues/5293)).
 * Fix issue where sending callbacks for playlist changes may cause problems
   because of parallel player access
   ([#5240](https://github.com/google/ExoPlayer/issues/5240)).

extensions/ffmpeg/src/main/java/com/google/android/exoplayer2/ext/ffmpeg/FfmpegDecoder.java

@@ -37,6 +37,10 @@
   private static final int OUTPUT_BUFFER_SIZE_16BIT = 65536;
   private static final int OUTPUT_BUFFER_SIZE_32BIT = OUTPUT_BUFFER_SIZE_16BIT * 2;
 
+  // Error codes matching ffmpeg_jni.cc.
+  private static final int DECODER_ERROR_INVALID_DATA = -1;
+  private static final int DECODER_ERROR_OTHER = -2;
+
   private final String codecName;
   private final @Nullable byte[] extraData;
   private final @C.Encoding int encoding;
@@ -106,8 +110,14 @@ protected FfmpegDecoderException createUnexpectedDecodeException(Throwable error
     int inputSize = inputData.limit();
     ByteBuffer outputData = outputBuffer.init(inputBuffer.timeUs, outputBufferSize);
     int result = ffmpegDecode(nativeContext, inputData, inputSize, outputData, outputBufferSize);
-    if (result < 0) {
-      return new FfmpegDecoderException("Error decoding (see logcat). Code: " + result);
+    if (result == DECODER_ERROR_INVALID_DATA) {
+      // Treat invalid data errors as non-fatal to match the behavior of MediaCodec. No output will
+      // be produced for this buffer, so mark it as decode-only to ensure that the audio sink's
+      // position is reset when more audio is produced.
+      outputBuffer.setFlags(C.BUFFER_FLAG_DECODE_ONLY);
+      return null;
+    } else if (result == DECODER_ERROR_OTHER) {
+      return new FfmpegDecoderException("Error decoding (see logcat).");
     }
     if (!hasOutputFormat) {
       channelCount = ffmpegGetChannelCount(nativeContext);

extensions/ffmpeg/src/main/jni/ffmpeg_jni.cc

@@ -63,6 +63,10 @@ static const AVSampleFormat OUTPUT_FORMAT_PCM_16BIT = AV_SAMPLE_FMT_S16;
 // Output format corresponding to AudioFormat.ENCODING_PCM_FLOAT.
 static const AVSampleFormat OUTPUT_FORMAT_PCM_FLOAT = AV_SAMPLE_FMT_FLT;
 
+// Error codes matching FfmpegDecoder.java.
+static const int DECODER_ERROR_INVALID_DATA = -1;
+static const int DECODER_ERROR_OTHER = -2;
+
 /**
  * Returns the AVCodec with the specified name, or NULL if it is not available.
  */
@@ -79,7 +83,7 @@ AVCodecContext *createContext(JNIEnv *env, AVCodec *codec, jbyteArray extraData,
 
 /**
  * Decodes the packet into the output buffer, returning the number of bytes
- * written, or a negative value in the case of an error.
+ * written, or a negative DECODER_ERROR constant value in the case of an error.
  */
 int decodePacket(AVCodecContext *context, AVPacket *packet,
                  uint8_t *outputBuffer, int outputSize);
@@ -238,6 +242,7 @@ AVCodecContext *createContext(JNIEnv *env, AVCodec *codec, jbyteArray extraData,
     context->channels = rawChannelCount;
     context->channel_layout = av_get_default_channel_layout(rawChannelCount);
   }
+  context->err_recognition = AV_EF_IGNORE_ERR;
   int result = avcodec_open2(context, codec, NULL);
   if (result < 0) {
     logError("avcodec_open2", result);
@@ -254,7 +259,8 @@ int decodePacket(AVCodecContext *context, AVPacket *packet,
   result = avcodec_send_packet(context, packet);
   if (result) {
     logError("avcodec_send_packet", result);
-    return result;
+    return result == AVERROR_INVALIDDATA ? DECODER_ERROR_INVALID_DATA
+                                         : DECODER_ERROR_OTHER;
   }
 
   // Dequeue output data until it runs out.

library/core/src/main/java/com/google/android/exoplayer2/audio/SimpleDecoderAudioRenderer.java

@@ -366,7 +366,10 @@ private boolean drainOutputBuffer() throws ExoPlaybackException, AudioDecoderExc
       if (outputBuffer == null) {
         return false;
       }
-      decoderCounters.skippedOutputBufferCount += outputBuffer.skippedOutputBufferCount;
+      if (outputBuffer.skippedOutputBufferCount > 0) {
+        decoderCounters.skippedOutputBufferCount += outputBuffer.skippedOutputBufferCount;
+        audioSink.handleDiscontinuity();
+      }
     }
 
     if (outputBuffer.isEndOfStream()) {