1 files changed, 47 insertions, 0 deletions
diff --git a/media/libstagefright/avc_utils.cpp b/media/libstagefright/avc_utils.cpp
index fa12cf0..95cf2d3 100644
--- a/media/libstagefright/avc_utils.cpp
+++ b/media/libstagefright/avc_utils.cpp
@@ -329,5 +329,52 @@ bool IsIDR(const sp<ABuffer> &buffer) {
     return foundIDR;
 }
 
+sp<MetaData> MakeAACCodecSpecificData(
+        unsigned profile, unsigned sampling_freq_index,
+        unsigned channel_configuration) {
+    sp<MetaData> meta = new MetaData;
+    meta->setCString(kKeyMIMEType, MEDIA_MIMETYPE_AUDIO_AAC);
+
+    CHECK_LE(sampling_freq_index, 11u);
+    static const int32_t kSamplingFreq[] = {
+        96000, 88200, 64000, 48000, 44100, 32000, 24000, 22050,
+        16000, 12000, 11025, 8000
+    };
+    meta->setInt32(kKeySampleRate, kSamplingFreq[sampling_freq_index]);
+    meta->setInt32(kKeyChannelCount, channel_configuration);
+
+    static const uint8_t kStaticESDS[] = {
+        0x03, 22,
+        0x00, 0x00,     // ES_ID
+        0x00,           // streamDependenceFlag, URL_Flag, OCRstreamFlag
+
+        0x04, 17,
+        0x40,                       // Audio ISO/IEC 14496-3
+        0x00, 0x00, 0x00, 0x00,
+        0x00, 0x00, 0x00, 0x00,
+        0x00, 0x00, 0x00, 0x00,
+
+        0x05, 2,
+        // AudioSpecificInfo follows
+
+        // oooo offf fccc c000
+        // o - audioObjectType
+        // f - samplingFreqIndex
+        // c - channelConfig
+    };
+    sp<ABuffer> csd = new ABuffer(sizeof(kStaticESDS) + 2);
+    memcpy(csd->data(), kStaticESDS, sizeof(kStaticESDS));
+
+    csd->data()[sizeof(kStaticESDS)] =
+        ((profile + 1) << 3) | (sampling_freq_index >> 1);
+
+    csd->data()[sizeof(kStaticESDS) + 1] =
+        ((sampling_freq_index << 7) & 0x80) | (channel_configuration << 3);
+
+    meta->setData(kKeyESDS, 0, csd->data(), csd->size());
+
+    return meta;
+}
+
 }  // namespace android