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Workaround decoder errata of the Exynos 4

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This commit is contained in:
Cameron Gutman 2014-08-29 15:38:08 -07:00
parent e3e7ac1e68
commit 5fdd9b773c
2 changed files with 12 additions and 7 deletions
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7
decoder-errata.txt
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@ -1,10 +1,13 @@
This file serves to document some of the decoder errata when using MediaCodec hardware decoders on certain devices.
1. num_ref_frames is set to 16 by NVENC which causes decoders to allocate 16+ buffers. This can cause an OOM error on some devices.
- Affected decoders: TI OMAP4, possibly some Qualcomm chips too (Galaxy S3 on 4.3+)
- Affected decoders: TI OMAP4
2. Some decoders have a huge per-frame latency with the unmodified SPS sent from NVENC. Setting max_dec_frame_buffering fixes this latency issue.
- Affected decoders: NVIDIA Tegra 3 and 4
3. Some decoders strictly require that you pass BUFFER_FLAG_CODEC_CONFIG and crash upon the IDR frame if you don't
- Affected decoders: TI OMAP4
- Affected decoders: TI OMAP4
4. Some decoders require num_ref_frames=1 and max_dec_frame_buffering=1 to avoid crashing on SPS or first I-frame
- Affected decoders: Qualcomm in GS3 on 4.3+, Exynos 4

12
src/com/limelight/binding/video/MediaCodecDecoderRenderer.java
View File

@ -36,7 +36,7 @@ public class MediaCodecDecoderRenderer implements VideoDecoderRenderer {
private final static byte[] BITSTREAM_RESTRICTIONS = new byte[] {(byte) 0xF1, (byte) 0x83, 0x2A, 0x00};
public static final List<String> blacklistedDecoderPrefixes;
public static final List<String> spsFixupBitsreamFixupDecoderPrefixes;
public static final List<String> spsFixupBitstreamFixupDecoderPrefixes;
public static final List<String> spsFixupNumRefFixupDecoderPrefixes;
static {
@ -46,13 +46,15 @@ public class MediaCodecDecoderRenderer implements VideoDecoderRenderer {
}
static {
spsFixupBitsreamFixupDecoderPrefixes = new LinkedList<String>();
spsFixupBitsreamFixupDecoderPrefixes.add("omx.nvidia");
spsFixupBitsreamFixupDecoderPrefixes.add("omx.qcom");
spsFixupBitstreamFixupDecoderPrefixes = new LinkedList<String>();
spsFixupBitstreamFixupDecoderPrefixes.add("omx.nvidia");
spsFixupBitstreamFixupDecoderPrefixes.add("omx.qcom");
spsFixupBitstreamFixupDecoderPrefixes.add("omx.sec");
spsFixupNumRefFixupDecoderPrefixes = new LinkedList<String>();
spsFixupNumRefFixupDecoderPrefixes.add("omx.TI");
spsFixupNumRefFixupDecoderPrefixes.add("omx.qcom");
spsFixupNumRefFixupDecoderPrefixes.add("omx.sec");
}
private static boolean isDecoderInList(List<String> decoderList, String decoderName) {
@ -137,7 +139,7 @@ public class MediaCodecDecoderRenderer implements VideoDecoderRenderer {
MediaCodecInfo safeDecoder = findSafeDecoder();
if (safeDecoder != null) {
videoDecoder = MediaCodec.createByCodecName(safeDecoder.getName());
needsSpsBitstreamFixup = isDecoderInList(spsFixupBitsreamFixupDecoderPrefixes, safeDecoder.getName());
needsSpsBitstreamFixup = isDecoderInList(spsFixupBitstreamFixupDecoderPrefixes, safeDecoder.getName());
needsSpsNumRefFixup = isDecoderInList(spsFixupNumRefFixupDecoderPrefixes, safeDecoder.getName());
if (needsSpsBitstreamFixup) {
LimeLog.info("Decoder "+safeDecoder.getName()+" needs SPS bitstream restrictions fixup");