diff --git a/demo/src/main/java/com/google/android/exoplayer/demo/Samples.java b/demo/src/main/java/com/google/android/exoplayer/demo/Samples.java index ef54b3ebc05..8560216d8b5 100644 --- a/demo/src/main/java/com/google/android/exoplayer/demo/Samples.java +++ b/demo/src/main/java/com/google/android/exoplayer/demo/Samples.java @@ -145,6 +145,9 @@ public Sample(String name, String contentId, String uri, int type) { "http://storage.googleapis.com/exoplayer-test-media-0/play.mp3", PlayerActivity.TYPE_OTHER), new Sample("Google Glass (WebM Video with Vorbis Audio)", "http://demos.webmproject.org/exoplayer/glass_vp9_vorbis.webm", PlayerActivity.TYPE_OTHER), + new Sample("Big Buck Bunny (FLV Video)", + "http://vod.leasewebcdn.com/bbb.flv?ri=1024&rs=150&start=0", PlayerActivity.TYPE_OTHER), + }; private Samples() {} diff --git a/library/src/main/java/com/google/android/exoplayer/extractor/ExtractorSampleSource.java b/library/src/main/java/com/google/android/exoplayer/extractor/ExtractorSampleSource.java index 8f0bc4977b8..e13bb16422a 100644 --- a/library/src/main/java/com/google/android/exoplayer/extractor/ExtractorSampleSource.java +++ b/library/src/main/java/com/google/android/exoplayer/extractor/ExtractorSampleSource.java @@ -58,9 +58,10 @@ *
  • MP3 ({@link com.google.android.exoplayer.extractor.mp3.Mp3Extractor})
    • *
  • AAC ({@link com.google.android.exoplayer.extractor.ts.AdtsExtractor})
    • *
  • MPEG TS ({@link com.google.android.exoplayer.extractor.ts.TsExtractor}
    • + *
  • FLV ({@link com.google.android.exoplayer.extractor.flv.FlvExtractor}
    • * * - *

    Seeking in AAC and MPEG TS streams is not supported. + *

    Seeking in AAC, MPEG TS and FLV streams is not supported. * *

    To override the default extractors, pass one or more {@link Extractor} instances to the * constructor. When reading a new stream, the first {@link Extractor} that returns {@code true} @@ -146,6 +147,13 @@ public UnrecognizedInputFormatException(Extractor[] extractors) { } catch (ClassNotFoundException e) { // Extractor not found. } + try { + DEFAULT_EXTRACTOR_CLASSES.add( + Class.forName("com.google.android.exoplayer.extractor.flv.FlvExtractor") + .asSubclass(Extractor.class)); + } catch (ClassNotFoundException e) { + // Extractor not found. + } } private final ExtractorHolder extractorHolder; diff --git a/library/src/main/java/com/google/android/exoplayer/extractor/flv/AudioTagPayloadReader.java b/library/src/main/java/com/google/android/exoplayer/extractor/flv/AudioTagPayloadReader.java new file mode 100644 index 00000000000..470a2eaf3f6 --- /dev/null +++ b/library/src/main/java/com/google/android/exoplayer/extractor/flv/AudioTagPayloadReader.java @@ -0,0 +1,125 @@ +/* + * Copyright (C) 2014 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 com.google.android.exoplayer.extractor.flv; + +import android.util.Pair; +import com.google.android.exoplayer.C; +import com.google.android.exoplayer.MediaFormat; +import com.google.android.exoplayer.extractor.TrackOutput; +import com.google.android.exoplayer.util.CodecSpecificDataUtil; +import com.google.android.exoplayer.util.MimeTypes; +import com.google.android.exoplayer.util.ParsableBitArray; +import com.google.android.exoplayer.util.ParsableByteArray; + +import java.util.Collections; + +/** + * Parses audio tags of from an FLV stream and extracts AAC frames. + */ +final class AudioTagPayloadReader extends TagPayloadReader { + // Sound format + private static final int AUDIO_FORMAT_AAC = 10; + + // AAC PACKET TYPE + private static final int AAC_PACKET_TYPE_SEQUENCE_HEADER = 0; + private static final int AAC_PACKET_TYPE_AAC_RAW = 1; + + // SAMPLING RATES + private static final int[] AUDIO_SAMPLING_RATE_TABLE = new int[] { + 5500, 11000, 22000, 44000 + }; + + // State variables + private boolean hasParsedAudioDataHeader; + private boolean hasOutputFormat; + + + public AudioTagPayloadReader(TrackOutput output) { + super(output); + } + + @Override + public void seek() { + + } + + @Override + protected boolean parseHeader(ParsableByteArray data) throws UnsupportedTrack { + // Parse audio data header, if it was not done, to extract information + // about the audio codec and audio configuration. + if (!hasParsedAudioDataHeader) { + int header = data.readUnsignedByte(); + int soundFormat = (header >> 4) & 0x0F; + int sampleRateIndex = (header >> 2) & 0x03; + int bitsPerSample = (header & 0x02) == 0x02 ? 16 : 8; + int channels = (header & 0x01) + 1; + + if (sampleRateIndex < 0 || sampleRateIndex >= AUDIO_SAMPLING_RATE_TABLE.length) { + throw new UnsupportedTrack("Invalid sample rate for the audio track"); + } + + if (!hasOutputFormat) { + // TODO: Adds support for MP3 and PCM + if (soundFormat != AUDIO_FORMAT_AAC) { + throw new UnsupportedTrack("Audio track not supported. Format: " + soundFormat + + ", Sample rate: " + sampleRateIndex + ", bps: " + bitsPerSample + ", channels: " + + channels); + } + } + + hasParsedAudioDataHeader = true; + } else { + // Skip header if it was parsed previously. + data.skipBytes(1); + } + + // In all the cases we will be managing AAC format (otherwise an exception would be + // fired so we can just always return true + return true; + } + + @Override + protected void parsePayload(ParsableByteArray data, long timeUs) { + int packetType = data.readUnsignedByte(); + // Parse sequence header just in case it was not done before. + if (packetType == AAC_PACKET_TYPE_SEQUENCE_HEADER && !hasOutputFormat) { + ParsableBitArray adtsScratch = new ParsableBitArray(new byte[data.bytesLeft()]); + data.readBytes(adtsScratch.data, 0, data.bytesLeft()); + + int audioObjectType = adtsScratch.readBits(5); + int sampleRateIndex = adtsScratch.readBits(4); + int channelConfig = adtsScratch.readBits(4); + + byte[] audioSpecificConfig = CodecSpecificDataUtil.buildAacAudioSpecificConfig( + audioObjectType, sampleRateIndex, channelConfig); + Pair audioParams = CodecSpecificDataUtil.parseAacAudioSpecificConfig( + audioSpecificConfig); + + MediaFormat mediaFormat = MediaFormat.createAudioFormat(MimeTypes.AUDIO_AAC, + MediaFormat.NO_VALUE, MediaFormat.NO_VALUE, durationUs, audioParams.second, + audioParams.first, Collections.singletonList(audioSpecificConfig), null); + + output.format(mediaFormat); + hasOutputFormat = true; + } else if (packetType == AAC_PACKET_TYPE_AAC_RAW) { + // Sample audio AAC frames + int bytesToWrite = data.bytesLeft(); + output.sampleData(data, bytesToWrite); + output.sampleMetadata(timeUs, C.SAMPLE_FLAG_SYNC, bytesToWrite, 0, null); + } + } + +} diff --git a/library/src/main/java/com/google/android/exoplayer/extractor/flv/FlvExtractor.java b/library/src/main/java/com/google/android/exoplayer/extractor/flv/FlvExtractor.java new file mode 100644 index 00000000000..563361d97d5 --- /dev/null +++ b/library/src/main/java/com/google/android/exoplayer/extractor/flv/FlvExtractor.java @@ -0,0 +1,301 @@ +/* + * Copyright (C) 2014 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 com.google.android.exoplayer.extractor.flv; + +import com.google.android.exoplayer.C; +import com.google.android.exoplayer.extractor.Extractor; +import com.google.android.exoplayer.extractor.ExtractorInput; +import com.google.android.exoplayer.extractor.ExtractorOutput; +import com.google.android.exoplayer.extractor.PositionHolder; +import com.google.android.exoplayer.extractor.SeekMap; +import com.google.android.exoplayer.util.Assertions; +import com.google.android.exoplayer.util.ParsableByteArray; +import com.google.android.exoplayer.util.Util; + +import java.io.EOFException; +import java.io.IOException; + +/** + * Facilitates the extraction of data from the FLV container format. + */ +public final class FlvExtractor implements Extractor, SeekMap { + // Header sizes + private static final int FLV_MIN_HEADER_SIZE = 9; + private static final int FLV_TAG_HEADER_SIZE = 11; + + // Parser states. + private static final int STATE_READING_TAG_HEADER = 1; + private static final int STATE_READING_SAMPLE = 2; + + // Tag types + private static final int TAG_TYPE_AUDIO = 8; + private static final int TAG_TYPE_VIDEO = 9; + private static final int TAG_TYPE_SCRIPT_DATA = 18; + + // FLV container identifier + private static final int FLV_TAG = Util.getIntegerCodeForString("FLV"); + + // Temporary buffers + private final ParsableByteArray scratch; + private final ParsableByteArray headerBuffer; + private final ParsableByteArray tagHeaderBuffer; + private ParsableByteArray tagData; + + // Extractor outputs. + private ExtractorOutput extractorOutput; + + // State variables. + private int parserState; + private int dataOffset; + private TagHeader currentTagHeader; + + // Tags readers + private AudioTagPayloadReader audioReader; + private VideoTagPayloadReader videoReader; + private ScriptTagPayloadReader metadataReader; + + public FlvExtractor() { + scratch = new ParsableByteArray(4); + headerBuffer = new ParsableByteArray(FLV_MIN_HEADER_SIZE); + tagHeaderBuffer = new ParsableByteArray(FLV_TAG_HEADER_SIZE); + dataOffset = 0; + currentTagHeader = new TagHeader(); + } + + @Override + public void init(ExtractorOutput output) { + this.extractorOutput = output; + } + + @Override + public boolean sniff(ExtractorInput input) throws IOException, InterruptedException { + // Check if file starts with "FLV" tag + input.peekFully(scratch.data, 0, 3); + scratch.setPosition(0); + if (scratch.readUnsignedInt24() != FLV_TAG) { + return false; + } + + // Checking reserved flags are set to 0 + input.peekFully(scratch.data, 0, 2); + scratch.setPosition(0); + if ((scratch.readUnsignedShort() & 0xFA) != 0) { + return false; + } + + // Read data offset + input.peekFully(scratch.data, 0, 4); + scratch.setPosition(0); + int dataOffset = scratch.readInt(); + + input.resetPeekPosition(); + input.advancePeekPosition(dataOffset); + + // Checking first "previous tag size" is set to 0 + input.peekFully(scratch.data, 0, 4); + scratch.setPosition(0); + + return scratch.readInt() == 0; + } + + @Override + public int read(ExtractorInput input, PositionHolder seekPosition) throws IOException, + InterruptedException { + if (dataOffset == 0 + && !readHeader(input)) { + return RESULT_END_OF_INPUT; + } + + try { + while (true) { + if (parserState == STATE_READING_TAG_HEADER) { + if (!readTagHeader(input)) { + return RESULT_END_OF_INPUT; + } + } else { + return readSample(input); + } + } + } catch (AudioTagPayloadReader.UnsupportedTrack unsupportedTrack) { + unsupportedTrack.printStackTrace(); + return RESULT_END_OF_INPUT; + } + } + + @Override + public void seek() { + dataOffset = 0; + } + + /** + * Reads FLV container header from the provided {@link ExtractorInput}. + * @param input The {@link ExtractorInput} from which to read. + * @return True if header was read successfully. Otherwise, false. + * @throws IOException If an error occurred reading from the source. + * @throws InterruptedException If the thread was interrupted. + */ + private boolean readHeader(ExtractorInput input) throws IOException, InterruptedException { + try { + input.readFully(headerBuffer.data, 0, FLV_MIN_HEADER_SIZE); + headerBuffer.setPosition(0); + headerBuffer.skipBytes(4); + int flags = headerBuffer.readUnsignedByte(); + boolean hasAudio = (flags & 0x04) != 0; + boolean hasVideo = (flags & 0x01) != 0; + + if (hasAudio && audioReader == null) { + audioReader = new AudioTagPayloadReader(extractorOutput.track(TAG_TYPE_AUDIO)); + } + if (hasVideo && videoReader == null) { + videoReader = new VideoTagPayloadReader(extractorOutput.track(TAG_TYPE_VIDEO)); + } + if (metadataReader == null) { + metadataReader = new ScriptTagPayloadReader(null); + } + extractorOutput.endTracks(); + extractorOutput.seekMap(this); + + // Store payload start position and start extended header (if there is one) + dataOffset = headerBuffer.readInt(); + + input.skipFully(dataOffset - FLV_MIN_HEADER_SIZE); + parserState = STATE_READING_TAG_HEADER; + } catch (EOFException eof) { + return false; + } + + return true; + } + + /** + * Reads a tag header from the provided {@link ExtractorInput}. + * @param input The {@link ExtractorInput} from which to read. + * @return True if tag header was read successfully. Otherwise, false. + * @throws IOException If an error occurred reading from the source. + * @throws InterruptedException If the thread was interrupted. + * @throws TagPayloadReader.UnsupportedTrack If payload of the tag is using a codec non + * supported codec. + */ + private boolean readTagHeader(ExtractorInput input) throws IOException, InterruptedException, + TagPayloadReader.UnsupportedTrack { + try { + // skipping previous tag size field + input.skipFully(4); + + // Read the tag header from the input. + input.readFully(tagHeaderBuffer.data, 0, FLV_TAG_HEADER_SIZE); + + tagHeaderBuffer.setPosition(0); + int type = tagHeaderBuffer.readUnsignedByte(); + int dataSize = tagHeaderBuffer.readUnsignedInt24(); + long timestamp = tagHeaderBuffer.readUnsignedInt24(); + timestamp = (tagHeaderBuffer.readUnsignedByte() << 24) | timestamp; + int streamId = tagHeaderBuffer.readUnsignedInt24(); + + currentTagHeader.type = type; + currentTagHeader.dataSize = dataSize; + currentTagHeader.timestamp = timestamp * 1000; + currentTagHeader.streamId = streamId; + + // Sanity checks. + Assertions.checkState(type == TAG_TYPE_AUDIO || type == TAG_TYPE_VIDEO + || type == TAG_TYPE_SCRIPT_DATA); + // Reuse tagData buffer to avoid lot of memory allocation (performance penalty). + if (tagData == null || dataSize > tagData.capacity()) { + tagData = new ParsableByteArray(dataSize); + } else { + tagData.setPosition(0); + } + tagData.setLimit(dataSize); + parserState = STATE_READING_SAMPLE; + + } catch (EOFException eof) { + return false; + } + + return true; + } + + /** + * Reads payload of an FLV tag from the provided {@link ExtractorInput}. + * @param input The {@link ExtractorInput} from which to read. + * @return One of {@link Extractor#RESULT_CONTINUE} and {@link Extractor#RESULT_END_OF_INPUT}. + * @throws IOException If an error occurred reading from the source. + * @throws InterruptedException If the thread was interrupted. + * @throws TagPayloadReader.UnsupportedTrack If payload of the tag is using a codec non + * supported codec. + */ + private int readSample(ExtractorInput input) throws IOException, + InterruptedException, AudioTagPayloadReader.UnsupportedTrack { + if (tagData != null) { + if (!input.readFully(tagData.data, 0, currentTagHeader.dataSize, true)) { + return RESULT_END_OF_INPUT; + } + tagData.setPosition(0); + } else { + input.skipFully(currentTagHeader.dataSize); + return RESULT_CONTINUE; + } + + // Pass payload to the right payload reader. + if (currentTagHeader.type == TAG_TYPE_AUDIO && audioReader != null) { + audioReader.consume(tagData, currentTagHeader.timestamp); + } else if (currentTagHeader.type == TAG_TYPE_VIDEO && videoReader != null) { + videoReader.consume(tagData, currentTagHeader.timestamp); + } else if (currentTagHeader.type == TAG_TYPE_SCRIPT_DATA && metadataReader != null) { + metadataReader.consume(tagData, currentTagHeader.timestamp); + if (metadataReader.getDurationUs() != C.UNKNOWN_TIME_US) { + if (audioReader != null) { + audioReader.setDurationUs(metadataReader.getDurationUs()); + } + if (videoReader != null) { + videoReader.setDurationUs(metadataReader.getDurationUs()); + } + } + } else { + tagData.reset(); + } + + parserState = STATE_READING_TAG_HEADER; + + return RESULT_CONTINUE; + } + + // SeekMap implementation. + // TODO: Add seeking support + @Override + public boolean isSeekable() { + return false; + } + + @Override + public long getPosition(long timeUs) { + return 0; + } + + + /** + * Defines header of a FLV tag + */ + final class TagHeader { + public int type; + public int dataSize; + public long timestamp; + public int streamId; + } + + +} diff --git a/library/src/main/java/com/google/android/exoplayer/extractor/flv/ScriptTagPayloadReader.java b/library/src/main/java/com/google/android/exoplayer/extractor/flv/ScriptTagPayloadReader.java new file mode 100644 index 00000000000..d11185207a9 --- /dev/null +++ b/library/src/main/java/com/google/android/exoplayer/extractor/flv/ScriptTagPayloadReader.java @@ -0,0 +1,201 @@ +/* + * Copyright (C) 2014 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 com.google.android.exoplayer.extractor.flv; + +import com.google.android.exoplayer.C; +import com.google.android.exoplayer.extractor.TrackOutput; +import com.google.android.exoplayer.util.ParsableByteArray; + +import java.nio.ByteBuffer; +import java.util.ArrayList; +import java.util.Date; +import java.util.HashMap; +import java.util.Map; + +/** + * Parses Script Data tags from an FLV stream and extracts metadata information. + */ +final class ScriptTagPayloadReader extends TagPayloadReader { + + // AMF object types + private static final int AMF_TYPE_UNKNOWN = -1; + private static final int AMF_TYPE_NUMBER = 0; + private static final int AMF_TYPE_BOOLEAN = 1; + private static final int AMF_TYPE_STRING = 2; + private static final int AMF_TYPE_OBJECT = 3; + private static final int AMF_TYPE_ECMA_ARRAY = 8; + private static final int AMF_TYPE_END_MARKER = 9; + private static final int AMF_TYPE_STRICT_ARRAY = 10; + private static final int AMF_TYPE_DATE = 11; + + /** + * @param output A {@link TrackOutput} to which samples should be written. + */ + public ScriptTagPayloadReader(TrackOutput output) { + super(output); + } + + @Override + public void seek() { + + } + + @Override + protected boolean parseHeader(ParsableByteArray data) throws UnsupportedTrack { + return true; + } + + @SuppressWarnings("unchecked") + @Override + protected void parsePayload(ParsableByteArray data, long timeUs) { + // Read message name (don't storing it as we are not going to give it any use) + readAMFData(data, AMF_TYPE_UNKNOWN); + Object obj = readAMFData(data, AMF_TYPE_UNKNOWN); + + if (obj instanceof Map) { + Map extractedMetadata = (Map) obj; + for (Map.Entry entry : extractedMetadata.entrySet()) { + if (entry.getValue() == null) { + continue; + } + + switch (entry.getKey()) { + case "duration": + this.durationUs = (long)(C.MICROS_PER_SECOND * (Double)(entry.getValue())); + break; + + default: + break; + } + } + } + } + + private Object readAMFData(ParsableByteArray data, int type) { + if (type == AMF_TYPE_UNKNOWN) { + type = data.readUnsignedByte(); + } + switch (type) { + case AMF_TYPE_NUMBER: + return readAMFDouble(data); + case AMF_TYPE_BOOLEAN: + return readAMFBoolean(data); + case AMF_TYPE_STRING: + return readAMFString(data); + case AMF_TYPE_OBJECT: + return readAMFObject(data); + case AMF_TYPE_ECMA_ARRAY: + return readAMFEcmaArray(data); + case AMF_TYPE_STRICT_ARRAY: + return readAMFStrictArray(data); + case AMF_TYPE_DATE: + return readAMFDate(data); + default: + return null; + } + } + + /** + * Read a boolean from an AMF encoded buffer + * @param data Buffer + * @return Boolean value read from the buffer + */ + private Boolean readAMFBoolean(ParsableByteArray data) { + return data.readUnsignedByte() == 1; + } + + /** + * Read a double number from an AMF encoded buffer + * @param data Buffer + * @return Double number read from the buffer + */ + private Double readAMFDouble(ParsableByteArray data) { + byte []b = new byte[8]; + data.readBytes(b, 0, b.length); + return ByteBuffer.wrap(b).getDouble(); + } + + /** + * Read a string from an AMF encoded buffer + * @param data Buffer + * @return String read from the buffer + */ + private String readAMFString(ParsableByteArray data) { + int size = data.readUnsignedShort(); + byte []b = new byte[size]; + data.readBytes(b, 0, b.length); + return new String(b); + } + + /** + * Read an array from an AMF encoded buffer + * @param data Buffer + * @return Array read from the buffer + */ + private Object readAMFStrictArray(ParsableByteArray data) { + long count = data.readUnsignedInt(); + ArrayList list = new ArrayList<>(); + for (int i = 0; i < count; i++) { + list.add(readAMFData(data, AMF_TYPE_UNKNOWN)); + } + return list; + } + + /** + * Read an object from an AMF encoded buffer + * @param data Buffer + * @return Object read from the buffer + */ + private Object readAMFObject(ParsableByteArray data) { + HashMap array = new HashMap<>(); + while (true) { + String key = readAMFString(data); + int type = data.readUnsignedByte(); + if (type == AMF_TYPE_END_MARKER) { + break; + } + array.put(key, readAMFData(data, type)); + } + return array; + } + + /** + * Read am ecma array from an AMF encoded buffer + * @param data Buffer + * @return Ecma array read from the buffer + */ + private Object readAMFEcmaArray(ParsableByteArray data) { + long count = data.readUnsignedInt(); + HashMap array = new HashMap<>(); + for (int i = 0; i < count; i++) { + String key = readAMFString(data); + int type = data.readUnsignedByte(); + array.put(key, readAMFData(data, type)); + } + return array; + } + + /** + * Read a date from an AMF encoded buffer + * @param data Buffer + * @return Date read from the buffer + */ + private Date readAMFDate(ParsableByteArray data) { + final Date date = new Date((long) readAMFDouble(data).doubleValue()); + data.readUnsignedShort(); + return date; + } +} diff --git a/library/src/main/java/com/google/android/exoplayer/extractor/flv/TagPayloadReader.java b/library/src/main/java/com/google/android/exoplayer/extractor/flv/TagPayloadReader.java new file mode 100644 index 00000000000..c032e3a8a19 --- /dev/null +++ b/library/src/main/java/com/google/android/exoplayer/extractor/flv/TagPayloadReader.java @@ -0,0 +1,98 @@ +/* + * Copyright (C) 2014 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 com.google.android.exoplayer.extractor.flv; + +import com.google.android.exoplayer.C; +import com.google.android.exoplayer.extractor.TrackOutput; +import com.google.android.exoplayer.util.ParsableByteArray; + +/** + * Extracts individual samples from FLV tags, preserving original order. + */ +/* package */ abstract class TagPayloadReader { + + protected final TrackOutput output; + + // Duration of the track + protected long durationUs; + + /** + * @param output A {@link TrackOutput} to which samples should be written. + */ + protected TagPayloadReader(TrackOutput output) { + this.output = output; + this.durationUs = C.UNKNOWN_TIME_US; + } + + /** + * Notifies the reader that a seek has occurred. + *

    + * Following a call to this method, the data passed to the next invocation of + * {@link #consume(ParsableByteArray, long)} will not be a continuation of the data that + * was previously passed. Hence the reader should reset any internal state. + */ + public abstract void seek(); + + /** + * Parses tag header + * @param data Buffer where the tag header is stored + * @return True if header was parsed successfully and then payload should be read; + * Otherwise, false + * @throws UnsupportedTrack + */ + protected abstract boolean parseHeader(ParsableByteArray data) throws UnsupportedTrack; + + /** + * Parses tag payload + * @param data Buffer where tag payload is stored + * @param timeUs Time position of the frame + */ + protected abstract void parsePayload(ParsableByteArray data, long timeUs); + + /** + * Consumes payload data. + * + * @param data The payload data to consume. + * @param timeUs The timestamp associated with the payload. + */ + public void consume(ParsableByteArray data, long timeUs) throws UnsupportedTrack { + if (parseHeader(data)) { + parsePayload(data, timeUs); + } + } + + /** + * Sets duration in microseconds + * @param durationUs duration in microseconds + */ + public void setDurationUs(long durationUs) { + this.durationUs = durationUs; + } + + public long getDurationUs() { + return durationUs; + } + /** + * Thrown when format described in the AudioTrack is not supported + */ + public static final class UnsupportedTrack extends Exception { + + public UnsupportedTrack(String msg) { + super(msg); + } + + } +} diff --git a/library/src/main/java/com/google/android/exoplayer/extractor/flv/VideoTagPayloadReader.java b/library/src/main/java/com/google/android/exoplayer/extractor/flv/VideoTagPayloadReader.java new file mode 100644 index 00000000000..19704f2b2fe --- /dev/null +++ b/library/src/main/java/com/google/android/exoplayer/extractor/flv/VideoTagPayloadReader.java @@ -0,0 +1,224 @@ +/* + * Copyright (C) 2014 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 com.google.android.exoplayer.extractor.flv; + +import android.util.Log; + +import com.google.android.exoplayer.C; +import com.google.android.exoplayer.MediaFormat; +import com.google.android.exoplayer.ParserException; +import com.google.android.exoplayer.extractor.TrackOutput; +import com.google.android.exoplayer.util.Assertions; +import com.google.android.exoplayer.util.CodecSpecificDataUtil; +import com.google.android.exoplayer.util.MimeTypes; +import com.google.android.exoplayer.util.NalUnitUtil; +import com.google.android.exoplayer.util.ParsableBitArray; +import com.google.android.exoplayer.util.ParsableByteArray; + +import java.util.ArrayList; +import java.util.List; + +/** + * Parses video tags from an FLV stream and extracts H.264 nal units. + */ +final class VideoTagPayloadReader extends TagPayloadReader { + private static final String TAG = "VideoTagPayloadReader"; + + // Video codec + private static final int VIDEO_CODEC_AVC = 7; + + // FRAME TYPE + private static final int VIDEO_FRAME_KEYFRAME = 1; + private static final int VIDEO_FRAME_VIDEO_INFO = 5; + + // PACKET TYPE + private static final int AVC_PACKET_TYPE_SEQUENCE_HEADER = 0; + private static final int AVC_PACKET_TYPE_AVC_NALU = 1; + private static final int AVC_PACKET_TYPE_AVC_END_OF_SEQUENCE = 2; + + // Temporary arrays. + private final ParsableByteArray nalStartCode; + private final ParsableByteArray nalLength; + private int nalUnitsLength; + + // State variables. + private boolean hasOutputFormat; + private int frameType; + + /** + * @param output A {@link TrackOutput} to which samples should be written. + */ + public VideoTagPayloadReader(TrackOutput output) { + super(output); + + nalStartCode = new ParsableByteArray(NalUnitUtil.NAL_START_CODE); + nalLength = new ParsableByteArray(4); + } + + @Override + public void seek() { + + } + + @Override + protected boolean parseHeader(ParsableByteArray data) throws UnsupportedTrack { + int header = data.readUnsignedByte(); + int frameType = (header >> 4) & 0x0F; + int videoCodec = (header & 0x0F); + + // Support just H.264 encoded content. + if (videoCodec != VIDEO_CODEC_AVC) { + throw new UnsupportedTrack("Video codec not supported. Codec: " + videoCodec); + } + this.frameType = frameType; + return (frameType != VIDEO_FRAME_VIDEO_INFO); + } + + @Override + protected void parsePayload(ParsableByteArray data, long timeUs) { + int packetType = data.readUnsignedByte(); + int compositionTime = data.readUnsignedInt24(); + // If there is a composition time, adjust timeUs accordingly + // Note: compositionTime within AVCVIDEOPACKET is provided in milliseconds + // and timeUs is in microseconds. + if (compositionTime > 0) { + timeUs += compositionTime * 1000; + } + // Parse avc sequence header in case this was not done before. + if (packetType == AVC_PACKET_TYPE_SEQUENCE_HEADER && !hasOutputFormat) { + ParsableByteArray videoSequence = new ParsableByteArray(new byte[data.bytesLeft()]); + data.readBytes(videoSequence.data, 0, data.bytesLeft()); + + AvcSequenceHeaderData avcData; + try { + avcData = parseAvcCodecPrivate(videoSequence); + nalUnitsLength = avcData.nalUnitLengthFieldLength; + } catch (ParserException e) { + e.printStackTrace(); + return; + } + + // Construct and output the format. + MediaFormat mediaFormat = MediaFormat.createVideoFormat(MimeTypes.VIDEO_H264, + MediaFormat.NO_VALUE, MediaFormat.NO_VALUE, durationUs, avcData.width, avcData.height, + avcData.initializationData, MediaFormat.NO_VALUE, avcData.pixelWidthAspectRatio); + output.format(mediaFormat); + hasOutputFormat = true; + } else if (packetType == AVC_PACKET_TYPE_AVC_NALU) { + // TODO: Deduplicate with Mp4Extractor. + // Zero the top three bytes of the array that we'll use to parse nal unit lengths, in case + // they're only 1 or 2 bytes long. + byte[] nalLengthData = nalLength.data; + nalLengthData[0] = 0; + nalLengthData[1] = 0; + nalLengthData[2] = 0; + int nalUnitLengthFieldLength = nalUnitsLength; + int nalUnitLengthFieldLengthDiff = 4 - nalUnitsLength; + // NAL units are length delimited, but the decoder requires start code delimited units. + // Loop until we've written the sample to the track output, replacing length delimiters with + // start codes as we encounter them. + int bytesWritten = 0; + int bytesToWrite; + while (data.bytesLeft() > 0) { + // Read the NAL length so that we know where we find the next one. + data.readBytes(nalLength.data, nalUnitLengthFieldLengthDiff, nalUnitLengthFieldLength); + nalLength.setPosition(0); + bytesToWrite = nalLength.readUnsignedIntToInt(); + + // First, write nal start code (replacing length field by nal delimiter codes) + nalStartCode.setPosition(0); + output.sampleData(nalStartCode, 4); + bytesWritten += 4; + + // Then write nal unit itsef + output.sampleData(data, bytesToWrite); + bytesWritten += bytesToWrite; + } + output.sampleMetadata(timeUs, frameType == VIDEO_FRAME_KEYFRAME ? C.SAMPLE_FLAG_SYNC : 0, + bytesWritten, 0, null); + } else if (packetType == AVC_PACKET_TYPE_AVC_END_OF_SEQUENCE) { + Log.d(TAG, "End of seq!!!"); + } + } + + /** + * Builds initialization data for a {@link MediaFormat} from H.264 (AVC) codec private data. + * + * @return The AvcSequenceHeader data with all the information needed to initialize + * the video codec. + * @throws ParserException If the initialization data could not be built. + */ + private AvcSequenceHeaderData parseAvcCodecPrivate(ParsableByteArray buffer) + throws ParserException { + try { + // TODO: Deduplicate with AtomParsers.parseAvcCFromParent. + buffer.setPosition(4); + int nalUnitLengthFieldLength = (buffer.readUnsignedByte() & 0x03) + 1; + Assertions.checkState(nalUnitLengthFieldLength != 3); + List initializationData = new ArrayList<>(); + int numSequenceParameterSets = buffer.readUnsignedByte() & 0x1F; + for (int i = 0; i < numSequenceParameterSets; i++) { + initializationData.add(NalUnitUtil.parseChildNalUnit(buffer)); + } + int numPictureParameterSets = buffer.readUnsignedByte(); + for (int j = 0; j < numPictureParameterSets; j++) { + initializationData.add(NalUnitUtil.parseChildNalUnit(buffer)); + } + + float pixelWidthAspectRatio = 1; + int width = MediaFormat.NO_VALUE; + int height = MediaFormat.NO_VALUE; + if (numSequenceParameterSets > 0) { + // Parse the first sequence parameter set to obtain pixelWidthAspectRatio. + ParsableBitArray spsDataBitArray = new ParsableBitArray(initializationData.get(0)); + // Skip the NAL header consisting of the nalUnitLengthField and the type (1 byte). + spsDataBitArray.setPosition(8 * (nalUnitLengthFieldLength + 1)); + CodecSpecificDataUtil.SpsData sps = CodecSpecificDataUtil.parseSpsNalUnit(spsDataBitArray); + width = sps.width; + height = sps.height; + pixelWidthAspectRatio = sps.pixelWidthAspectRatio; + } + + return new AvcSequenceHeaderData(initializationData, nalUnitLengthFieldLength, + width, height, pixelWidthAspectRatio); + } catch (ArrayIndexOutOfBoundsException e) { + throw new ParserException("Error parsing AVC codec private"); + } + } + + /** + * Holds data parsed from an Sequence Header video tag atom. + */ + private static final class AvcSequenceHeaderData { + + public final List initializationData; + public final int nalUnitLengthFieldLength; + public final float pixelWidthAspectRatio; + public final int width; + public final int height; + + public AvcSequenceHeaderData(List initializationData, int nalUnitLengthFieldLength, + int width, int height, float pixelWidthAspectRatio) { + this.initializationData = initializationData; + this.nalUnitLengthFieldLength = nalUnitLengthFieldLength; + this.pixelWidthAspectRatio = pixelWidthAspectRatio; + this.width = width; + this.height = height; + } + + } + +}