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Don't read GaSpecificConfig unless required

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-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=164125579
This commit is contained in:
aquilescanta 2017-08-03 08:17:26 -07:00 committed by Oliver Woodman
parent ccd05cbd04
commit 72daef7a4c
2 changed files with 38 additions and 34 deletions
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2
library/core/src/main/java/com/google/android/exoplayer2/extractor/ts/LatmReader.java
View File

@ -256,7 +256,7 @@ public final class LatmReader implements ElementaryStreamReader {
private int parseAudioSpecificConfig(ParsableBitArray data) throws ParserException {
int bitsLeft = data.bitsLeft();
Pair<Integer, Integer> config = CodecSpecificDataUtil.parseAacAudioSpecificConfig(data);
Pair<Integer, Integer> config = CodecSpecificDataUtil.parseAacAudioSpecificConfig(data, true);
sampleRateHz = config.first;
channelCount = config.second;
return bitsLeft - data.bitsLeft();

70
library/core/src/main/java/com/google/android/exoplayer2/util/CodecSpecificDataUtil.java
View File

@ -90,7 +90,7 @@ public final class CodecSpecificDataUtil {
*/
public static Pair<Integer, Integer> parseAacAudioSpecificConfig(byte[] audioSpecificConfig)
throws ParserException {
return parseAacAudioSpecificConfig(new ParsableBitArray(audioSpecificConfig));
return parseAacAudioSpecificConfig(new ParsableBitArray(audioSpecificConfig), false);
}
/**
@ -98,11 +98,13 @@ public final class CodecSpecificDataUtil {
*
* @param bitArray A {@link ParsableBitArray} containing the AudioSpecificConfig to parse. The
* position is advanced to the end of the AudioSpecificConfig.
* @param forceReadToEnd Whether the entire AudioSpecificConfig should be read. Required for
* knowing the length of the configuration payload.
* @return A pair consisting of the sample rate in Hz and the channel count.
* @throws ParserException If the AudioSpecificConfig cannot be parsed as it's not supported.
*/
public static Pair<Integer, Integer> parseAacAudioSpecificConfig(ParsableBitArray bitArray)
throws ParserException {
public static Pair<Integer, Integer> parseAacAudioSpecificConfig(ParsableBitArray bitArray,
boolean forceReadToEnd) throws ParserException {
int audioObjectType = getAacAudioObjectType(bitArray);
int sampleRate = getAacSamplingFrequency(bitArray);
int channelConfiguration = bitArray.readBits(4);
@ -120,36 +122,38 @@ public final class CodecSpecificDataUtil {
}
}
switch (audioObjectType) {
case 1:
case 2:
case 3:
case 4:
case 6:
case 7:
case 17:
case 19:
case 20:
case 21:
case 22:
case 23:
parseGaSpecificConfig(bitArray, audioObjectType, channelConfiguration);
break;
default:
throw new ParserException("Unsupported audio object type: " + audioObjectType);
}
switch (audioObjectType) {
case 17:
case 19:
case 20:
case 21:
case 22:
case 23:
int epConfig = bitArray.readBits(2);
if (epConfig == 2 || epConfig == 3) {
throw new ParserException("Unsupported epConfig: " + epConfig);
}
break;
if (forceReadToEnd) {
switch (audioObjectType) {
case 1:
case 2:
case 3:
case 4:
case 6:
case 7:
case 17:
case 19:
case 20:
case 21:
case 22:
case 23:
parseGaSpecificConfig(bitArray, audioObjectType, channelConfiguration);
break;
default:
throw new ParserException("Unsupported audio object type: " + audioObjectType);
}
switch (audioObjectType) {
case 17:
case 19:
case 20:
case 21:
case 22:
case 23:
int epConfig = bitArray.readBits(2);
if (epConfig == 2 || epConfig == 3) {
throw new ParserException("Unsupported epConfig: " + epConfig);
}
break;
}
}
// For supported containers, bits_to_decode() is always 0.
int channelCount = AUDIO_SPECIFIC_CONFIG_CHANNEL_COUNT_TABLE[channelConfiguration];