diff options
Diffstat (limited to 'mobile/android/exoplayer2/src/main/java/org/mozilla/thirdparty/com/google/android/exoplayer2/extractor/ts/H265Reader.java')
| -rw-r--r-- | mobile/android/exoplayer2/src/main/java/org/mozilla/thirdparty/com/google/android/exoplayer2/extractor/ts/H265Reader.java | 494 |
1 files changed, 494 insertions, 0 deletions
diff --git a/mobile/android/exoplayer2/src/main/java/org/mozilla/thirdparty/com/google/android/exoplayer2/extractor/ts/H265Reader.java b/mobile/android/exoplayer2/src/main/java/org/mozilla/thirdparty/com/google/android/exoplayer2/extractor/ts/H265Reader.java new file mode 100644 index 0000000000..6aa7c5d71d --- /dev/null +++ b/mobile/android/exoplayer2/src/main/java/org/mozilla/thirdparty/com/google/android/exoplayer2/extractor/ts/H265Reader.java @@ -0,0 +1,494 @@ +/* + * Copyright (C) 2016 The Android Open Source Project + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ +package org.mozilla.thirdparty.com.google.android.exoplayer2.extractor.ts; + +import org.mozilla.thirdparty.com.google.android.exoplayer2.C; +import org.mozilla.thirdparty.com.google.android.exoplayer2.Format; +import org.mozilla.thirdparty.com.google.android.exoplayer2.extractor.ExtractorOutput; +import org.mozilla.thirdparty.com.google.android.exoplayer2.extractor.TrackOutput; +import org.mozilla.thirdparty.com.google.android.exoplayer2.extractor.ts.TsPayloadReader.TrackIdGenerator; +import org.mozilla.thirdparty.com.google.android.exoplayer2.util.Log; +import org.mozilla.thirdparty.com.google.android.exoplayer2.util.MimeTypes; +import org.mozilla.thirdparty.com.google.android.exoplayer2.util.NalUnitUtil; +import org.mozilla.thirdparty.com.google.android.exoplayer2.util.ParsableByteArray; +import org.mozilla.thirdparty.com.google.android.exoplayer2.util.ParsableNalUnitBitArray; +import java.util.Collections; + +/** + * Parses a continuous H.265 byte stream and extracts individual frames. + */ +public final class H265Reader implements ElementaryStreamReader { + + private static final String TAG = "H265Reader"; + + // nal_unit_type values from H.265/HEVC (2014) Table 7-1. + private static final int RASL_R = 9; + private static final int BLA_W_LP = 16; + private static final int CRA_NUT = 21; + private static final int VPS_NUT = 32; + private static final int SPS_NUT = 33; + private static final int PPS_NUT = 34; + private static final int PREFIX_SEI_NUT = 39; + private static final int SUFFIX_SEI_NUT = 40; + + private final SeiReader seiReader; + + private String formatId; + private TrackOutput output; + private SampleReader sampleReader; + + // State that should not be reset on seek. + private boolean hasOutputFormat; + + // State that should be reset on seek. + private final boolean[] prefixFlags; + private final NalUnitTargetBuffer vps; + private final NalUnitTargetBuffer sps; + private final NalUnitTargetBuffer pps; + private final NalUnitTargetBuffer prefixSei; + private final NalUnitTargetBuffer suffixSei; // TODO: Are both needed? + private long totalBytesWritten; + + // Per packet state that gets reset at the start of each packet. + private long pesTimeUs; + + // Scratch variables to avoid allocations. + private final ParsableByteArray seiWrapper; + + /** + * @param seiReader An SEI reader for consuming closed caption channels. + */ + public H265Reader(SeiReader seiReader) { + this.seiReader = seiReader; + prefixFlags = new boolean[3]; + vps = new NalUnitTargetBuffer(VPS_NUT, 128); + sps = new NalUnitTargetBuffer(SPS_NUT, 128); + pps = new NalUnitTargetBuffer(PPS_NUT, 128); + prefixSei = new NalUnitTargetBuffer(PREFIX_SEI_NUT, 128); + suffixSei = new NalUnitTargetBuffer(SUFFIX_SEI_NUT, 128); + seiWrapper = new ParsableByteArray(); + } + + @Override + public void seek() { + NalUnitUtil.clearPrefixFlags(prefixFlags); + vps.reset(); + sps.reset(); + pps.reset(); + prefixSei.reset(); + suffixSei.reset(); + sampleReader.reset(); + totalBytesWritten = 0; + } + + @Override + public void createTracks(ExtractorOutput extractorOutput, TrackIdGenerator idGenerator) { + idGenerator.generateNewId(); + formatId = idGenerator.getFormatId(); + output = extractorOutput.track(idGenerator.getTrackId(), C.TRACK_TYPE_VIDEO); + sampleReader = new SampleReader(output); + seiReader.createTracks(extractorOutput, idGenerator); + } + + @Override + public void packetStarted(long pesTimeUs, @TsPayloadReader.Flags int flags) { + // TODO (Internal b/32267012): Consider using random access indicator. + this.pesTimeUs = pesTimeUs; + } + + @Override + public void consume(ParsableByteArray data) { + while (data.bytesLeft() > 0) { + int offset = data.getPosition(); + int limit = data.limit(); + byte[] dataArray = data.data; + + // Append the data to the buffer. + totalBytesWritten += data.bytesLeft(); + output.sampleData(data, data.bytesLeft()); + + // Scan the appended data, processing NAL units as they are encountered + while (offset < limit) { + int nalUnitOffset = NalUnitUtil.findNalUnit(dataArray, offset, limit, prefixFlags); + + if (nalUnitOffset == limit) { + // We've scanned to the end of the data without finding the start of another NAL unit. + nalUnitData(dataArray, offset, limit); + return; + } + + // We've seen the start of a NAL unit of the following type. + int nalUnitType = NalUnitUtil.getH265NalUnitType(dataArray, nalUnitOffset); + + // This is the number of bytes from the current offset to the start of the next NAL unit. + // It may be negative if the NAL unit started in the previously consumed data. + int lengthToNalUnit = nalUnitOffset - offset; + if (lengthToNalUnit > 0) { + nalUnitData(dataArray, offset, nalUnitOffset); + } + + int bytesWrittenPastPosition = limit - nalUnitOffset; + long absolutePosition = totalBytesWritten - bytesWrittenPastPosition; + // Indicate the end of the previous NAL unit. If the length to the start of the next unit + // is negative then we wrote too many bytes to the NAL buffers. Discard the excess bytes + // when notifying that the unit has ended. + endNalUnit(absolutePosition, bytesWrittenPastPosition, + lengthToNalUnit < 0 ? -lengthToNalUnit : 0, pesTimeUs); + // Indicate the start of the next NAL unit. + startNalUnit(absolutePosition, bytesWrittenPastPosition, nalUnitType, pesTimeUs); + // Continue scanning the data. + offset = nalUnitOffset + 3; + } + } + } + + @Override + public void packetFinished() { + // Do nothing. + } + + private void startNalUnit(long position, int offset, int nalUnitType, long pesTimeUs) { + if (hasOutputFormat) { + sampleReader.startNalUnit(position, offset, nalUnitType, pesTimeUs); + } else { + vps.startNalUnit(nalUnitType); + sps.startNalUnit(nalUnitType); + pps.startNalUnit(nalUnitType); + } + prefixSei.startNalUnit(nalUnitType); + suffixSei.startNalUnit(nalUnitType); + } + + private void nalUnitData(byte[] dataArray, int offset, int limit) { + if (hasOutputFormat) { + sampleReader.readNalUnitData(dataArray, offset, limit); + } else { + vps.appendToNalUnit(dataArray, offset, limit); + sps.appendToNalUnit(dataArray, offset, limit); + pps.appendToNalUnit(dataArray, offset, limit); + } + prefixSei.appendToNalUnit(dataArray, offset, limit); + suffixSei.appendToNalUnit(dataArray, offset, limit); + } + + private void endNalUnit(long position, int offset, int discardPadding, long pesTimeUs) { + if (hasOutputFormat) { + sampleReader.endNalUnit(position, offset); + } else { + vps.endNalUnit(discardPadding); + sps.endNalUnit(discardPadding); + pps.endNalUnit(discardPadding); + if (vps.isCompleted() && sps.isCompleted() && pps.isCompleted()) { + output.format(parseMediaFormat(formatId, vps, sps, pps)); + hasOutputFormat = true; + } + } + if (prefixSei.endNalUnit(discardPadding)) { + int unescapedLength = NalUnitUtil.unescapeStream(prefixSei.nalData, prefixSei.nalLength); + seiWrapper.reset(prefixSei.nalData, unescapedLength); + + // Skip the NAL prefix and type. + seiWrapper.skipBytes(5); + seiReader.consume(pesTimeUs, seiWrapper); + } + if (suffixSei.endNalUnit(discardPadding)) { + int unescapedLength = NalUnitUtil.unescapeStream(suffixSei.nalData, suffixSei.nalLength); + seiWrapper.reset(suffixSei.nalData, unescapedLength); + + // Skip the NAL prefix and type. + seiWrapper.skipBytes(5); + seiReader.consume(pesTimeUs, seiWrapper); + } + } + + private static Format parseMediaFormat(String formatId, NalUnitTargetBuffer vps, + NalUnitTargetBuffer sps, NalUnitTargetBuffer pps) { + // Build codec-specific data. + byte[] csd = new byte[vps.nalLength + sps.nalLength + pps.nalLength]; + System.arraycopy(vps.nalData, 0, csd, 0, vps.nalLength); + System.arraycopy(sps.nalData, 0, csd, vps.nalLength, sps.nalLength); + System.arraycopy(pps.nalData, 0, csd, vps.nalLength + sps.nalLength, pps.nalLength); + + // Parse the SPS NAL unit, as per H.265/HEVC (2014) 7.3.2.2.1. + ParsableNalUnitBitArray bitArray = new ParsableNalUnitBitArray(sps.nalData, 0, sps.nalLength); + bitArray.skipBits(40 + 4); // NAL header, sps_video_parameter_set_id + int maxSubLayersMinus1 = bitArray.readBits(3); + bitArray.skipBit(); // sps_temporal_id_nesting_flag + + // profile_tier_level(1, sps_max_sub_layers_minus1) + bitArray.skipBits(88); // if (profilePresentFlag) {...} + bitArray.skipBits(8); // general_level_idc + int toSkip = 0; + for (int i = 0; i < maxSubLayersMinus1; i++) { + if (bitArray.readBit()) { // sub_layer_profile_present_flag[i] + toSkip += 89; + } + if (bitArray.readBit()) { // sub_layer_level_present_flag[i] + toSkip += 8; + } + } + bitArray.skipBits(toSkip); + if (maxSubLayersMinus1 > 0) { + bitArray.skipBits(2 * (8 - maxSubLayersMinus1)); + } + + bitArray.readUnsignedExpGolombCodedInt(); // sps_seq_parameter_set_id + int chromaFormatIdc = bitArray.readUnsignedExpGolombCodedInt(); + if (chromaFormatIdc == 3) { + bitArray.skipBit(); // separate_colour_plane_flag + } + int picWidthInLumaSamples = bitArray.readUnsignedExpGolombCodedInt(); + int picHeightInLumaSamples = bitArray.readUnsignedExpGolombCodedInt(); + if (bitArray.readBit()) { // conformance_window_flag + int confWinLeftOffset = bitArray.readUnsignedExpGolombCodedInt(); + int confWinRightOffset = bitArray.readUnsignedExpGolombCodedInt(); + int confWinTopOffset = bitArray.readUnsignedExpGolombCodedInt(); + int confWinBottomOffset = bitArray.readUnsignedExpGolombCodedInt(); + // H.265/HEVC (2014) Table 6-1 + int subWidthC = chromaFormatIdc == 1 || chromaFormatIdc == 2 ? 2 : 1; + int subHeightC = chromaFormatIdc == 1 ? 2 : 1; + picWidthInLumaSamples -= subWidthC * (confWinLeftOffset + confWinRightOffset); + picHeightInLumaSamples -= subHeightC * (confWinTopOffset + confWinBottomOffset); + } + bitArray.readUnsignedExpGolombCodedInt(); // bit_depth_luma_minus8 + bitArray.readUnsignedExpGolombCodedInt(); // bit_depth_chroma_minus8 + int log2MaxPicOrderCntLsbMinus4 = bitArray.readUnsignedExpGolombCodedInt(); + // for (i = sps_sub_layer_ordering_info_present_flag ? 0 : sps_max_sub_layers_minus1; ...) + for (int i = bitArray.readBit() ? 0 : maxSubLayersMinus1; i <= maxSubLayersMinus1; i++) { + bitArray.readUnsignedExpGolombCodedInt(); // sps_max_dec_pic_buffering_minus1[i] + bitArray.readUnsignedExpGolombCodedInt(); // sps_max_num_reorder_pics[i] + bitArray.readUnsignedExpGolombCodedInt(); // sps_max_latency_increase_plus1[i] + } + bitArray.readUnsignedExpGolombCodedInt(); // log2_min_luma_coding_block_size_minus3 + bitArray.readUnsignedExpGolombCodedInt(); // log2_diff_max_min_luma_coding_block_size + bitArray.readUnsignedExpGolombCodedInt(); // log2_min_luma_transform_block_size_minus2 + bitArray.readUnsignedExpGolombCodedInt(); // log2_diff_max_min_luma_transform_block_size + bitArray.readUnsignedExpGolombCodedInt(); // max_transform_hierarchy_depth_inter + bitArray.readUnsignedExpGolombCodedInt(); // max_transform_hierarchy_depth_intra + // if (scaling_list_enabled_flag) { if (sps_scaling_list_data_present_flag) {...}} + boolean scalingListEnabled = bitArray.readBit(); + if (scalingListEnabled && bitArray.readBit()) { + skipScalingList(bitArray); + } + bitArray.skipBits(2); // amp_enabled_flag (1), sample_adaptive_offset_enabled_flag (1) + if (bitArray.readBit()) { // pcm_enabled_flag + // pcm_sample_bit_depth_luma_minus1 (4), pcm_sample_bit_depth_chroma_minus1 (4) + bitArray.skipBits(8); + bitArray.readUnsignedExpGolombCodedInt(); // log2_min_pcm_luma_coding_block_size_minus3 + bitArray.readUnsignedExpGolombCodedInt(); // log2_diff_max_min_pcm_luma_coding_block_size + bitArray.skipBit(); // pcm_loop_filter_disabled_flag + } + // Skips all short term reference picture sets. + skipShortTermRefPicSets(bitArray); + if (bitArray.readBit()) { // long_term_ref_pics_present_flag + // num_long_term_ref_pics_sps + for (int i = 0; i < bitArray.readUnsignedExpGolombCodedInt(); i++) { + int ltRefPicPocLsbSpsLength = log2MaxPicOrderCntLsbMinus4 + 4; + // lt_ref_pic_poc_lsb_sps[i], used_by_curr_pic_lt_sps_flag[i] + bitArray.skipBits(ltRefPicPocLsbSpsLength + 1); + } + } + bitArray.skipBits(2); // sps_temporal_mvp_enabled_flag, strong_intra_smoothing_enabled_flag + float pixelWidthHeightRatio = 1; + if (bitArray.readBit()) { // vui_parameters_present_flag + if (bitArray.readBit()) { // aspect_ratio_info_present_flag + int aspectRatioIdc = bitArray.readBits(8); + if (aspectRatioIdc == NalUnitUtil.EXTENDED_SAR) { + int sarWidth = bitArray.readBits(16); + int sarHeight = bitArray.readBits(16); + if (sarWidth != 0 && sarHeight != 0) { + pixelWidthHeightRatio = (float) sarWidth / sarHeight; + } + } else if (aspectRatioIdc < NalUnitUtil.ASPECT_RATIO_IDC_VALUES.length) { + pixelWidthHeightRatio = NalUnitUtil.ASPECT_RATIO_IDC_VALUES[aspectRatioIdc]; + } else { + Log.w(TAG, "Unexpected aspect_ratio_idc value: " + aspectRatioIdc); + } + } + } + + return Format.createVideoSampleFormat(formatId, MimeTypes.VIDEO_H265, null, Format.NO_VALUE, + Format.NO_VALUE, picWidthInLumaSamples, picHeightInLumaSamples, Format.NO_VALUE, + Collections.singletonList(csd), Format.NO_VALUE, pixelWidthHeightRatio, null); + } + + /** + * Skips scaling_list_data(). See H.265/HEVC (2014) 7.3.4. + */ + private static void skipScalingList(ParsableNalUnitBitArray bitArray) { + for (int sizeId = 0; sizeId < 4; sizeId++) { + for (int matrixId = 0; matrixId < 6; matrixId += sizeId == 3 ? 3 : 1) { + if (!bitArray.readBit()) { // scaling_list_pred_mode_flag[sizeId][matrixId] + // scaling_list_pred_matrix_id_delta[sizeId][matrixId] + bitArray.readUnsignedExpGolombCodedInt(); + } else { + int coefNum = Math.min(64, 1 << (4 + (sizeId << 1))); + if (sizeId > 1) { + // scaling_list_dc_coef_minus8[sizeId - 2][matrixId] + bitArray.readSignedExpGolombCodedInt(); + } + for (int i = 0; i < coefNum; i++) { + bitArray.readSignedExpGolombCodedInt(); // scaling_list_delta_coef + } + } + } + } + } + + /** + * Reads the number of short term reference picture sets in a SPS as ue(v), then skips all of + * them. See H.265/HEVC (2014) 7.3.7. + */ + private static void skipShortTermRefPicSets(ParsableNalUnitBitArray bitArray) { + int numShortTermRefPicSets = bitArray.readUnsignedExpGolombCodedInt(); + boolean interRefPicSetPredictionFlag = false; + int numNegativePics; + int numPositivePics; + // As this method applies in a SPS, the only element of NumDeltaPocs accessed is the previous + // one, so we just keep track of that rather than storing the whole array. + // RefRpsIdx = stRpsIdx - (delta_idx_minus1 + 1) and delta_idx_minus1 is always zero in SPS. + int previousNumDeltaPocs = 0; + for (int stRpsIdx = 0; stRpsIdx < numShortTermRefPicSets; stRpsIdx++) { + if (stRpsIdx != 0) { + interRefPicSetPredictionFlag = bitArray.readBit(); + } + if (interRefPicSetPredictionFlag) { + bitArray.skipBit(); // delta_rps_sign + bitArray.readUnsignedExpGolombCodedInt(); // abs_delta_rps_minus1 + for (int j = 0; j <= previousNumDeltaPocs; j++) { + if (bitArray.readBit()) { // used_by_curr_pic_flag[j] + bitArray.skipBit(); // use_delta_flag[j] + } + } + } else { + numNegativePics = bitArray.readUnsignedExpGolombCodedInt(); + numPositivePics = bitArray.readUnsignedExpGolombCodedInt(); + previousNumDeltaPocs = numNegativePics + numPositivePics; + for (int i = 0; i < numNegativePics; i++) { + bitArray.readUnsignedExpGolombCodedInt(); // delta_poc_s0_minus1[i] + bitArray.skipBit(); // used_by_curr_pic_s0_flag[i] + } + for (int i = 0; i < numPositivePics; i++) { + bitArray.readUnsignedExpGolombCodedInt(); // delta_poc_s1_minus1[i] + bitArray.skipBit(); // used_by_curr_pic_s1_flag[i] + } + } + } + } + + private static final class SampleReader { + + /** + * Offset in bytes of the first_slice_segment_in_pic_flag in a NAL unit containing a + * slice_segment_layer_rbsp. + */ + private static final int FIRST_SLICE_FLAG_OFFSET = 2; + + private final TrackOutput output; + + // Per NAL unit state. A sample consists of one or more NAL units. + private long nalUnitStartPosition; + private boolean nalUnitHasKeyframeData; + private int nalUnitBytesRead; + private long nalUnitTimeUs; + private boolean lookingForFirstSliceFlag; + private boolean isFirstSlice; + private boolean isFirstParameterSet; + + // Per sample state that gets reset at the start of each sample. + private boolean readingSample; + private boolean writingParameterSets; + private long samplePosition; + private long sampleTimeUs; + private boolean sampleIsKeyframe; + + public SampleReader(TrackOutput output) { + this.output = output; + } + + public void reset() { + lookingForFirstSliceFlag = false; + isFirstSlice = false; + isFirstParameterSet = false; + readingSample = false; + writingParameterSets = false; + } + + public void startNalUnit(long position, int offset, int nalUnitType, long pesTimeUs) { + isFirstSlice = false; + isFirstParameterSet = false; + nalUnitTimeUs = pesTimeUs; + nalUnitBytesRead = 0; + nalUnitStartPosition = position; + + if (nalUnitType >= VPS_NUT) { + if (!writingParameterSets && readingSample) { + // This is a non-VCL NAL unit, so flush the previous sample. + outputSample(offset); + readingSample = false; + } + if (nalUnitType <= PPS_NUT) { + // This sample will have parameter sets at the start. + isFirstParameterSet = !writingParameterSets; + writingParameterSets = true; + } + } + + // Look for the flag if this NAL unit contains a slice_segment_layer_rbsp. + nalUnitHasKeyframeData = (nalUnitType >= BLA_W_LP && nalUnitType <= CRA_NUT); + lookingForFirstSliceFlag = nalUnitHasKeyframeData || nalUnitType <= RASL_R; + } + + public void readNalUnitData(byte[] data, int offset, int limit) { + if (lookingForFirstSliceFlag) { + int headerOffset = offset + FIRST_SLICE_FLAG_OFFSET - nalUnitBytesRead; + if (headerOffset < limit) { + isFirstSlice = (data[headerOffset] & 0x80) != 0; + lookingForFirstSliceFlag = false; + } else { + nalUnitBytesRead += limit - offset; + } + } + } + + public void endNalUnit(long position, int offset) { + if (writingParameterSets && isFirstSlice) { + // This sample has parameter sets. Reset the key-frame flag based on the first slice. + sampleIsKeyframe = nalUnitHasKeyframeData; + writingParameterSets = false; + } else if (isFirstParameterSet || isFirstSlice) { + // This NAL unit is at the start of a new sample (access unit). + if (readingSample) { + // Output the sample ending before this NAL unit. + int nalUnitLength = (int) (position - nalUnitStartPosition); + outputSample(offset + nalUnitLength); + } + samplePosition = nalUnitStartPosition; + sampleTimeUs = nalUnitTimeUs; + readingSample = true; + sampleIsKeyframe = nalUnitHasKeyframeData; + } + } + + private void outputSample(int offset) { + @C.BufferFlags int flags = sampleIsKeyframe ? C.BUFFER_FLAG_KEY_FRAME : 0; + int size = (int) (nalUnitStartPosition - samplePosition); + output.sampleMetadata(sampleTimeUs, flags, size, offset, null); + } + + } + +} |