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Add support for FLAC audio codec

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PR #4410 <#https://github.com/Genymobile/scrcpy/pull/4410>

Co-authored-by: Romain Vimont <rom@rom1v.com>
Signed-off-by: Romain Vimont <rom@rom1v.com>
This commit is contained in:
megapro17
2023-11-07 15:09:47 +03:00
committed by Romain Vimont
parent f23be823fd
commit 4857c5dd59
12 changed files with 103 additions and 16 deletions
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1
server/src/main/java/com/genymobile/scrcpy/AudioCodec.java
View File

@@ -5,6 +5,7 @@ import android.media.MediaFormat;
public enum AudioCodec implements Codec {
OPUS(0x6f_70_75_73, "opus", MediaFormat.MIMETYPE_AUDIO_OPUS),
AAC(0x00_61_61_63, "aac", MediaFormat.MIMETYPE_AUDIO_AAC),
FLAC(0x66_6c_61_63, "flac", MediaFormat.MIMETYPE_AUDIO_FLAC),
RAW(0x00_72_61_77, "raw", MediaFormat.MIMETYPE_AUDIO_RAW);
private final int id; // 4-byte ASCII representation of the name

47
server/src/main/java/com/genymobile/scrcpy/Streamer.java
View File

@@ -5,6 +5,7 @@ import android.media.MediaCodec;
import java.io.FileDescriptor;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.ByteOrder;
import java.util.Arrays;
public final class Streamer {
@@ -29,6 +30,7 @@ public final class Streamer {
public Codec getCodec() {
return codec;
}
public void writeAudioHeader() throws IOException {
if (sendCodecMeta) {
ByteBuffer buffer = ByteBuffer.allocate(4);
@@ -61,8 +63,12 @@ public final class Streamer {
}
public void writePacket(ByteBuffer buffer, long pts, boolean config, boolean keyFrame) throws IOException {
if (config && codec == AudioCodec.OPUS) {
fixOpusConfigPacket(buffer);
if (config) {
if (codec == AudioCodec.OPUS) {
fixOpusConfigPacket(buffer);
} else if (codec == AudioCodec.FLAC) {
fixFlacConfigPacket(buffer);
}
}
if (sendFrameMeta) {
@@ -140,4 +146,41 @@ public final class Streamer {
// Set the buffer to point to the OPUS header slice
buffer.limit(buffer.position() + size);
}
private static void fixFlacConfigPacket(ByteBuffer buffer) throws IOException {
// 00000000 66 4c 61 43 00 00 00 22 |fLaC..." |
// -------------- BELOW IS THE PART WE MUST PUT AS EXTRADATA -------------------
// 00000000 10 00 10 00 00 00 00 00 | ........|
// 00000010 00 00 0b b8 02 f0 00 00 00 00 00 00 00 00 00 00 |................|
// 00000020 00 00 00 00 00 00 00 00 00 00 |.......... |
// ------------------------------------------------------------------------------
// 00000020 84 00 00 28 20 00 | ...( .|
// 00000030 00 00 72 65 66 65 72 65 6e 63 65 20 6c 69 62 46 |..reference libF|
// 00000040 4c 41 43 20 31 2e 33 2e 32 20 32 30 32 32 31 30 |LAC 1.3.2 202210|
// 00000050 32 32 00 00 00 00 |22....|
//
// <https://developer.android.com/reference/android/media/MediaCodec#CSD>
if (buffer.remaining() < 8) {
throw new IOException("Not enough data in FLAC config packet");
}
final byte[] flacHeaderId = {'f', 'L', 'a', 'C'};
byte[] idBuffer = new byte[4];
buffer.get(idBuffer);
if (!Arrays.equals(idBuffer, flacHeaderId)) {
throw new IOException("FLAC header not found");
}
// The size is in big-endian
buffer.order(ByteOrder.BIG_ENDIAN);
int size = buffer.getInt();
if (buffer.remaining() < size) {
throw new IOException("Not enough data in FLAC header (invalid size: " + size + ")");
}
// Set the buffer to point to the FLAC header slice
buffer.limit(buffer.position() + size);
}
}