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Added MPEG audio support to TsExtractor v.2

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This commit is contained in:
Sergio Moreno Mozota 2015-02-27 14:29:21 +01:00
parent 1545a052f0
commit 2ce938d650
2 changed files with 28 additions and 17 deletions
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23
library/src/main/java/com/google/android/exoplayer/hls/parser/MpaReader.java
View file

@ -38,7 +38,6 @@ import java.util.Collections;
private static final int STATE_READING_SAMPLE = 2;
private static final int HEADER_SIZE = 4;
private static final int SYNCWORD_SIZE = 2;
private static final int CRC_SIZE = 2;
private final ParsableBitArray mpaScratch;
@ -172,13 +171,8 @@ import java.util.Collections;
case STATE_READING_HEADER:
int targetLength = hasCrc ? HEADER_SIZE + CRC_SIZE : HEADER_SIZE;
if (continueRead(data, mpaScratch.getData(), targetLength)) {
parseHeader();
startSample(timeUs);
/**
* Reset buffer after Header data extraction in order to pass full
* mpeg audio frame to the mpeg decoder
*/
data.setPosition(data.getPosition() - targetLength);
parseHeader();
bytesRead = 0;
state = STATE_READING_SAMPLE;
}
@ -260,6 +254,7 @@ import java.util.Collections;
* Parses the sample header.
*/
private void parseHeader() {
int headerLength = hasCrc ? HEADER_SIZE + CRC_SIZE : HEADER_SIZE;
mpaScratch.setPosition(0);
if (!hasMediaFormat()) {
@ -270,12 +265,7 @@ import java.util.Collections;
int audioObjectType = 32 + layer;
int bitRate = MPA_BITRATES[isLSF][layer][mpaScratch.readBits(4)];
int sampleRate = MPA_SAMPLING_RATES[3 - isLSF][mpaScratch.readBits(2)];
int sampleRateIndex = 0;
for (; sampleRateIndex < (CodecSpecificDataUtil.AUDIO_SPECIFIC_CONFIG_SAMPLING_RATE_TABLE).length; sampleRateIndex++) {
if ((CodecSpecificDataUtil.AUDIO_SPECIFIC_CONFIG_SAMPLING_RATE_TABLE)[sampleRateIndex] == sampleRate) {
break;
}
}
int sampleRateIndex = CodecSpecificDataUtil.getSampleRateIndex(sampleRate);
int paddingBit = (mpaScratch.readBit()) ? 1 : 0;
mpaScratch.skipBits(1);
int channelConfig = mpaScratch.readBits(2) == 3 ? 1 : 2;
@ -291,7 +281,12 @@ import java.util.Collections;
Collections.singletonList(audioSpecificConfig));
frameDurationUs = (C.MICROS_PER_SECOND * MPA_SAMPLES_PER_FRAME[isLSF][layer]) / mediaFormat.sampleRate;
setMediaFormat(mediaFormat);
sampleSize = CalcMpaFrameSize(layer, isLSF, bitRate * 1000, sampleRate, paddingBit);
sampleSize = CalcMpaFrameSize(layer, isLSF, bitRate * 1000, sampleRate, paddingBit) - headerLength;
}
mpaScratch.setPosition(0);
ParsableByteArray header = new ParsableByteArray(mpaScratch.getData(),headerLength);
appendData(header, headerLength);
}
}

22
library/src/main/java/com/google/android/exoplayer/util/CodecSpecificDataUtil.java
View file

@ -29,11 +29,11 @@ public final class CodecSpecificDataUtil {
private static final byte[] NAL_START_CODE = new byte[] {0, 0, 0, 1};
public static final int[] AUDIO_SPECIFIC_CONFIG_SAMPLING_RATE_TABLE = new int[] {
private static final int[] AUDIO_SPECIFIC_CONFIG_SAMPLING_RATE_TABLE = new int[] {
96000, 88200, 64000, 48000, 44100, 32000, 24000, 22050, 16000, 12000, 11025, 8000, 7350
};
public static final int[] AUDIO_SPECIFIC_CONFIG_CHANNEL_COUNT_TABLE = new int[] {
private static final int[] AUDIO_SPECIFIC_CONFIG_CHANNEL_COUNT_TABLE = new int[] {
0, 1, 2, 3, 4, 5, 6, 8
};
@ -41,6 +41,22 @@ public final class CodecSpecificDataUtil {
private CodecSpecificDataUtil() {}
/**
* Gets the sample rate index.
*
* @param sampleRate The sample rate in Hz.
* @return The sample rate index.
*/
public static int getSampleRateIndex(int sampleRate) {
int sampleRateIndex = 0;
for (; sampleRateIndex < AUDIO_SPECIFIC_CONFIG_SAMPLING_RATE_TABLE.length; sampleRateIndex++) {
if (AUDIO_SPECIFIC_CONFIG_SAMPLING_RATE_TABLE[sampleRateIndex] == sampleRate) {
return sampleRateIndex;
}
}
return -1;
}
/**
* Parses an AudioSpecificConfig, as defined in ISO 14496-3 1.6.2.1
*
@ -49,7 +65,7 @@ public final class CodecSpecificDataUtil {
*/
public static Pair<Integer, Integer> parseAudioSpecificConfig(byte[] audioSpecificConfig) {
int audioObjectType = (audioSpecificConfig[0] >> 3) & 0x1F;
if (audioObjectType != 31) {
if (audioObjectType < 31) {
int byteOffset = audioObjectType == 5 || audioObjectType == 29 ? 1 : 0;
int frequencyIndex = (audioSpecificConfig[byteOffset] & 0x7) << 1 |
((audioSpecificConfig[byteOffset + 1] >> 7) & 0x1);