media/libstagefright/Utils.cpp - platform/frameworks/av - Git at Google

 /*
  * Copyright (C) 2009 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.
  */

 //#define LOG_NDEBUG 0
 #define LOG_TAG "Utils"
 #include <utils/Log.h>

 #include "include/ESDS.h"

 #include <arpa/inet.h>

 #include <media/stagefright/foundation/ABuffer.h>
 #include <media/stagefright/foundation/ADebug.h>
 #include <media/stagefright/foundation/AMessage.h>
 #include <media/stagefright/MetaData.h>
 #include <media/stagefright/Utils.h>

 namespace android {

 uint16_t U16_AT(const uint8_t *ptr) {
     return ptr[0] << 8 | ptr[1];
 }

 uint32_t U32_AT(const uint8_t *ptr) {
     return ptr[0] << 24 | ptr[1] << 16 | ptr[2] << 8 | ptr[3];
 }

 uint64_t U64_AT(const uint8_t *ptr) {
     return ((uint64_t)U32_AT(ptr)) << 32 | U32_AT(ptr + 4);
 }

 uint16_t U16LE_AT(const uint8_t *ptr) {
     return ptr[0] | (ptr[1] << 8);
 }

 uint32_t U32LE_AT(const uint8_t *ptr) {
     return ptr[3] << 24 | ptr[2] << 16 | ptr[1] << 8 | ptr[0];
 }

 uint64_t U64LE_AT(const uint8_t *ptr) {
     return ((uint64_t)U32LE_AT(ptr + 4)) << 32 | U32LE_AT(ptr);
 }

 // XXX warning: these won't work on big-endian host.
 uint64_t ntoh64(uint64_t x) {
     return ((uint64_t)ntohl(x & 0xffffffff) << 32) | ntohl(x >> 32);
 }

 uint64_t hton64(uint64_t x) {
     return ((uint64_t)htonl(x & 0xffffffff) << 32) | htonl(x >> 32);
 }

 status_t convertMetaDataToMessage(
         const sp<MetaData> &meta, sp<AMessage> *format) {
     format->clear();

     const char *mime;
     CHECK(meta->findCString(kKeyMIMEType, &mime));

     sp<AMessage> msg = new AMessage;
     msg->setString("mime", mime);

     int64_t durationUs;
     if (meta->findInt64(kKeyDuration, &durationUs)) {
         msg->setInt64("durationUs", durationUs);
     }

     if (!strncasecmp("video/", mime, 6)) {
         int32_t width, height;
         CHECK(meta->findInt32(kKeyWidth, &width));
         CHECK(meta->findInt32(kKeyHeight, &height));

         msg->setInt32("width", width);
         msg->setInt32("height", height);
     } else if (!strncasecmp("audio/", mime, 6)) {
         int32_t numChannels, sampleRate;
         CHECK(meta->findInt32(kKeyChannelCount, &numChannels));
         CHECK(meta->findInt32(kKeySampleRate, &sampleRate));

         msg->setInt32("channel-count", numChannels);
         msg->setInt32("sample-rate", sampleRate);

         int32_t channelMask;
         if (meta->findInt32(kKeyChannelMask, &channelMask)) {
             msg->setInt32("channel-mask", channelMask);
         }

         int32_t delay = 0;
         if (meta->findInt32(kKeyEncoderDelay, &delay)) {
             msg->setInt32("encoder-delay", delay);
         }
         int32_t padding = 0;
         if (meta->findInt32(kKeyEncoderPadding, &padding)) {
             msg->setInt32("encoder-padding", padding);
         }

         int32_t isADTS;
         if (meta->findInt32(kKeyIsADTS, &isADTS)) {
             msg->setInt32("is-adts", true);
         }
     }

     int32_t maxInputSize;
     if (meta->findInt32(kKeyMaxInputSize, &maxInputSize)) {
         msg->setInt32("max-input-size", maxInputSize);
     }

     uint32_t type;
     const void *data;
     size_t size;
     if (meta->findData(kKeyAVCC, &type, &data, &size)) {
         // Parse the AVCDecoderConfigurationRecord

         const uint8_t *ptr = (const uint8_t *)data;

         CHECK(size >= 7);
         CHECK_EQ((unsigned)ptr[0], 1u);  // configurationVersion == 1
         uint8_t profile = ptr[1];
         uint8_t level = ptr[3];

         // There is decodable content out there that fails the following
         // assertion, let's be lenient for now...
         // CHECK((ptr[4] >> 2) == 0x3f);  // reserved

         size_t lengthSize = 1 + (ptr[4] & 3);

         // commented out check below as H264_QVGA_500_NO_AUDIO.3gp
         // violates it...
         // CHECK((ptr[5] >> 5) == 7);  // reserved

         size_t numSeqParameterSets = ptr[5] & 31;

         ptr += 6;
         size -= 6;

         sp<ABuffer> buffer = new ABuffer(1024);
         buffer->setRange(0, 0);

         for (size_t i = 0; i < numSeqParameterSets; ++i) {
             CHECK(size >= 2);
             size_t length = U16_AT(ptr);

             ptr += 2;
             size -= 2;

             CHECK(size >= length);

             memcpy(buffer->data() + buffer->size(), "\x00\x00\x00\x01", 4);
             memcpy(buffer->data() + buffer->size() + 4, ptr, length);
             buffer->setRange(0, buffer->size() + 4 + length);

             ptr += length;
             size -= length;
         }

         buffer->meta()->setInt32("csd", true);
         buffer->meta()->setInt64("timeUs", 0);

         msg->setBuffer("csd-0", buffer);

         buffer = new ABuffer(1024);
         buffer->setRange(0, 0);

         CHECK(size >= 1);
         size_t numPictureParameterSets = *ptr;
         ++ptr;
         --size;

         for (size_t i = 0; i < numPictureParameterSets; ++i) {
             CHECK(size >= 2);
             size_t length = U16_AT(ptr);

             ptr += 2;
             size -= 2;

             CHECK(size >= length);

             memcpy(buffer->data() + buffer->size(), "\x00\x00\x00\x01", 4);
             memcpy(buffer->data() + buffer->size() + 4, ptr, length);
             buffer->setRange(0, buffer->size() + 4 + length);

             ptr += length;
             size -= length;
         }

         buffer->meta()->setInt32("csd", true);
         buffer->meta()->setInt64("timeUs", 0);
         msg->setBuffer("csd-1", buffer);
     } else if (meta->findData(kKeyESDS, &type, &data, &size)) {
         ESDS esds((const char *)data, size);
         CHECK_EQ(esds.InitCheck(), (status_t)OK);

         const void *codec_specific_data;
         size_t codec_specific_data_size;
         esds.getCodecSpecificInfo(
                 &codec_specific_data, &codec_specific_data_size);

         sp<ABuffer> buffer = new ABuffer(codec_specific_data_size);

         memcpy(buffer->data(), codec_specific_data,
                codec_specific_data_size);

         buffer->meta()->setInt32("csd", true);
         buffer->meta()->setInt64("timeUs", 0);
         msg->setBuffer("csd-0", buffer);
     } else if (meta->findData(kKeyVorbisInfo, &type, &data, &size)) {
         sp<ABuffer> buffer = new ABuffer(size);
         memcpy(buffer->data(), data, size);

         buffer->meta()->setInt32("csd", true);
         buffer->meta()->setInt64("timeUs", 0);
         msg->setBuffer("csd-0", buffer);

         if (!meta->findData(kKeyVorbisBooks, &type, &data, &size)) {
             return -EINVAL;
         }

         buffer = new ABuffer(size);
         memcpy(buffer->data(), data, size);

         buffer->meta()->setInt32("csd", true);
         buffer->meta()->setInt64("timeUs", 0);
         msg->setBuffer("csd-1", buffer);
     }

     *format = msg;

     return OK;
 }

 static size_t reassembleAVCC(const sp<ABuffer> &csd0, const sp<ABuffer> csd1, char *avcc) {

     avcc[0] = 1;        // version
     avcc[1] = 0x64;     // profile
     avcc[2] = 0;        // unused (?)
     avcc[3] = 0xd;      // level
     avcc[4] = 0xff;     // reserved+size

     size_t i = 0;
     int numparams = 0;
     int lastparamoffset = 0;
     int avccidx = 6;
     do {
         if (i >= csd0->size() - 4 ||
                 memcmp(csd0->data() + i, "\x00\x00\x00\x01", 4) == 0) {
             if (i >= csd0->size() - 4) {
                 // there can't be another param here, so use all the rest
                 i = csd0->size();
             }
             ALOGV("block at %d, last was %d", i, lastparamoffset);
             if (lastparamoffset > 0) {
                 int size = i - lastparamoffset;
                 avcc[avccidx++] = size >> 8;
                 avcc[avccidx++] = size & 0xff;
                 memcpy(avcc+avccidx, csd0->data() + lastparamoffset, size);
                 avccidx += size;
                 numparams++;
             }
             i += 4;
             lastparamoffset = i;
         } else {
             i++;
         }
     } while(i < csd0->size());
     ALOGV("csd0 contains %d params", numparams);

     avcc[5] = 0xe0 | numparams;
     //and now csd-1
     i = 0;
     numparams = 0;
     lastparamoffset = 0;
     int numpicparamsoffset = avccidx;
     avccidx++;
     do {
         if (i >= csd1->size() - 4 ||
                 memcmp(csd1->data() + i, "\x00\x00\x00\x01", 4) == 0) {
             if (i >= csd1->size() - 4) {
                 // there can't be another param here, so use all the rest
                 i = csd1->size();
             }
             ALOGV("block at %d, last was %d", i, lastparamoffset);
             if (lastparamoffset > 0) {
                 int size = i - lastparamoffset;
                 avcc[avccidx++] = size >> 8;
                 avcc[avccidx++] = size & 0xff;
                 memcpy(avcc+avccidx, csd1->data() + lastparamoffset, size);
                 avccidx += size;
                 numparams++;
             }
             i += 4;
             lastparamoffset = i;
         } else {
             i++;
         }
     } while(i < csd1->size());
     avcc[numpicparamsoffset] = numparams;
     return avccidx;
 }

 static void reassembleESDS(const sp<ABuffer> &csd0, char *esds) {
     int csd0size = csd0->size();
     esds[0] = 3; // kTag_ESDescriptor;
     int esdescriptorsize = 26 + csd0size;
     CHECK(esdescriptorsize < 268435456); // 7 bits per byte, so max is 2^28-1
     esds[1] = 0x80 | (esdescriptorsize >> 21);
     esds[2] = 0x80 | ((esdescriptorsize >> 14) & 0x7f);
     esds[3] = 0x80 | ((esdescriptorsize >> 7) & 0x7f);
     esds[4] = (esdescriptorsize & 0x7f);
     esds[5] = esds[6] = 0; // es id
     esds[7] = 0; // flags
     esds[8] = 4; // kTag_DecoderConfigDescriptor
     int configdescriptorsize = 18 + csd0size;
     esds[9] = 0x80 | (configdescriptorsize >> 21);
     esds[10] = 0x80 | ((configdescriptorsize >> 14) & 0x7f);
     esds[11] = 0x80 | ((configdescriptorsize >> 7) & 0x7f);
     esds[12] = (configdescriptorsize & 0x7f);
     esds[13] = 0x40; // objectTypeIndication
     esds[14] = 0x15; // not sure what 14-25 mean, they are ignored by ESDS.cpp,
     esds[15] = 0x00; // but the actual values here were taken from a real file.
     esds[16] = 0x18;
     esds[17] = 0x00;
     esds[18] = 0x00;
     esds[19] = 0x00;
     esds[20] = 0xfa;
     esds[21] = 0x00;
     esds[22] = 0x00;
     esds[23] = 0x00;
     esds[24] = 0xfa;
     esds[25] = 0x00;
     esds[26] = 5; // kTag_DecoderSpecificInfo;
     esds[27] = 0x80 | (csd0size >> 21);
     esds[28] = 0x80 | ((csd0size >> 14) & 0x7f);
     esds[29] = 0x80 | ((csd0size >> 7) & 0x7f);
     esds[30] = (csd0size & 0x7f);
     memcpy((void*)&esds[31], csd0->data(), csd0size);
     // data following this is ignored, so don't bother appending it

 }

 void convertMessageToMetaData(const sp<AMessage> &msg, sp<MetaData> &meta) {
     AString mime;
     if (msg->findString("mime", &mime)) {
         meta->setCString(kKeyMIMEType, mime.c_str());
     } else {
         ALOGW("did not find mime type");
     }

     int64_t durationUs;
     if (msg->findInt64("durationUs", &durationUs)) {
         meta->setInt64(kKeyDuration, durationUs);
     }

     if (mime.startsWith("video/")) {
         int32_t width;
         int32_t height;
         if (msg->findInt32("width", &width) && msg->findInt32("height", &height)) {
             meta->setInt32(kKeyWidth, width);
             meta->setInt32(kKeyHeight, height);
         } else {
             ALOGW("did not find width and/or height");
         }
     } else if (mime.startsWith("audio/")) {
         int32_t numChannels;
         if (msg->findInt32("channel-count", &numChannels)) {
             meta->setInt32(kKeyChannelCount, numChannels);
         }
         int32_t sampleRate;
         if (msg->findInt32("sample-rate", &sampleRate)) {
             meta->setInt32(kKeySampleRate, sampleRate);
         }
         int32_t channelMask;
         if (msg->findInt32("channel-mask", &channelMask)) {
             meta->setInt32(kKeyChannelMask, channelMask);
         }
         int32_t delay = 0;
         if (msg->findInt32("encoder-delay", &delay)) {
             meta->setInt32(kKeyEncoderDelay, delay);
         }
         int32_t padding = 0;
         if (msg->findInt32("encoder-padding", &padding)) {
             meta->setInt32(kKeyEncoderPadding, padding);
         }

         int32_t isADTS;
         if (msg->findInt32("is-adts", &isADTS)) {
             meta->setInt32(kKeyIsADTS, isADTS);
         }
     }

     int32_t maxInputSize;
     if (msg->findInt32("max-input-size", &maxInputSize)) {
         meta->setInt32(kKeyMaxInputSize, maxInputSize);
     }

     // reassemble the csd data into its original form
     sp<ABuffer> csd0;
     if (msg->findBuffer("csd-0", &csd0)) {
         if (mime.startsWith("video/")) { // do we need to be stricter than this?
             sp<ABuffer> csd1;
             if (msg->findBuffer("csd-1", &csd1)) {
                 char avcc[1024]; // that oughta be enough, right?
                 size_t outsize = reassembleAVCC(csd0, csd1, avcc);
                 meta->setData(kKeyAVCC, kKeyAVCC, avcc, outsize);
             }
         } else if (mime.startsWith("audio/")) {
             int csd0size = csd0->size();
             char esds[csd0size + 31];
             reassembleESDS(csd0, esds);
             meta->setData(kKeyESDS, kKeyESDS, esds, sizeof(esds));
         }
     }

     // XXX TODO add whatever other keys there are

 #if 0
     ALOGI("converted %s to:", msg->debugString(0).c_str());
     meta->dumpToLog();
 #endif
 }


 }  // namespace android
	/*
	* Copyright (C) 2009 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.
	*/

	//#define LOG_NDEBUG 0
	#define LOG_TAG "Utils"
	#include <utils/Log.h>

	#include "include/ESDS.h"

	#include <arpa/inet.h>

	#include <media/stagefright/foundation/ABuffer.h>
	#include <media/stagefright/foundation/ADebug.h>
	#include <media/stagefright/foundation/AMessage.h>
	#include <media/stagefright/MetaData.h>
	#include <media/stagefright/Utils.h>

	namespace android {

	uint16_t U16_AT(const uint8_t *ptr) {
	return ptr[0] << 8 \| ptr[1];
	}

	uint32_t U32_AT(const uint8_t *ptr) {
	return ptr[0] << 24 \| ptr[1] << 16 \| ptr[2] << 8 \| ptr[3];
	}

	uint64_t U64_AT(const uint8_t *ptr) {
	return ((uint64_t)U32_AT(ptr)) << 32 \| U32_AT(ptr + 4);
	}

	uint16_t U16LE_AT(const uint8_t *ptr) {
	return ptr[0] \| (ptr[1] << 8);
	}

	uint32_t U32LE_AT(const uint8_t *ptr) {
	return ptr[3] << 24 \| ptr[2] << 16 \| ptr[1] << 8 \| ptr[0];
	}

	uint64_t U64LE_AT(const uint8_t *ptr) {
	return ((uint64_t)U32LE_AT(ptr + 4)) << 32 \| U32LE_AT(ptr);
	}

	// XXX warning: these won't work on big-endian host.
	uint64_t ntoh64(uint64_t x) {
	return ((uint64_t)ntohl(x & 0xffffffff) << 32) \| ntohl(x >> 32);
	}

	uint64_t hton64(uint64_t x) {
	return ((uint64_t)htonl(x & 0xffffffff) << 32) \| htonl(x >> 32);
	}

	status_t convertMetaDataToMessage(
	const sp<MetaData> &meta, sp<AMessage> *format) {
	format->clear();

	const char *mime;
	CHECK(meta->findCString(kKeyMIMEType, &mime));

	sp<AMessage> msg = new AMessage;
	msg->setString("mime", mime);

	int64_t durationUs;
	if (meta->findInt64(kKeyDuration, &durationUs)) {
	msg->setInt64("durationUs", durationUs);
	}

	if (!strncasecmp("video/", mime, 6)) {
	int32_t width, height;
	CHECK(meta->findInt32(kKeyWidth, &width));
	CHECK(meta->findInt32(kKeyHeight, &height));

	msg->setInt32("width", width);
	msg->setInt32("height", height);
	} else if (!strncasecmp("audio/", mime, 6)) {
	int32_t numChannels, sampleRate;
	CHECK(meta->findInt32(kKeyChannelCount, &numChannels));
	CHECK(meta->findInt32(kKeySampleRate, &sampleRate));

	msg->setInt32("channel-count", numChannels);
	msg->setInt32("sample-rate", sampleRate);

	int32_t channelMask;
	if (meta->findInt32(kKeyChannelMask, &channelMask)) {
	msg->setInt32("channel-mask", channelMask);
	}

	int32_t delay = 0;
	if (meta->findInt32(kKeyEncoderDelay, &delay)) {
	msg->setInt32("encoder-delay", delay);
	}
	int32_t padding = 0;
	if (meta->findInt32(kKeyEncoderPadding, &padding)) {
	msg->setInt32("encoder-padding", padding);
	}

	int32_t isADTS;
	if (meta->findInt32(kKeyIsADTS, &isADTS)) {
	msg->setInt32("is-adts", true);
	}
	}

	int32_t maxInputSize;
	if (meta->findInt32(kKeyMaxInputSize, &maxInputSize)) {
	msg->setInt32("max-input-size", maxInputSize);
	}

	uint32_t type;
	const void *data;
	size_t size;
	if (meta->findData(kKeyAVCC, &type, &data, &size)) {
	// Parse the AVCDecoderConfigurationRecord

	const uint8_t ptr = (const uint8_t )data;

	CHECK(size >= 7);
	CHECK_EQ((unsigned)ptr[0], 1u); // configurationVersion == 1
	uint8_t profile = ptr[1];
	uint8_t level = ptr[3];

	// There is decodable content out there that fails the following
	// assertion, let's be lenient for now...
	// CHECK((ptr[4] >> 2) == 0x3f); // reserved

	size_t lengthSize = 1 + (ptr[4] & 3);

	// commented out check below as H264_QVGA_500_NO_AUDIO.3gp
	// violates it...
	// CHECK((ptr[5] >> 5) == 7); // reserved

	size_t numSeqParameterSets = ptr[5] & 31;

	ptr += 6;
	size -= 6;

	sp<ABuffer> buffer = new ABuffer(1024);
	buffer->setRange(0, 0);

	for (size_t i = 0; i < numSeqParameterSets; ++i) {
	CHECK(size >= 2);
	size_t length = U16_AT(ptr);

	ptr += 2;
	size -= 2;

	CHECK(size >= length);

	memcpy(buffer->data() + buffer->size(), "\x00\x00\x00\x01", 4);
	memcpy(buffer->data() + buffer->size() + 4, ptr, length);
	buffer->setRange(0, buffer->size() + 4 + length);

	ptr += length;
	size -= length;
	}

	buffer->meta()->setInt32("csd", true);
	buffer->meta()->setInt64("timeUs", 0);

	msg->setBuffer("csd-0", buffer);

	buffer = new ABuffer(1024);
	buffer->setRange(0, 0);

	CHECK(size >= 1);
	size_t numPictureParameterSets = *ptr;
	++ptr;
	--size;

	for (size_t i = 0; i < numPictureParameterSets; ++i) {
	CHECK(size >= 2);
	size_t length = U16_AT(ptr);

	ptr += 2;
	size -= 2;

	CHECK(size >= length);

	memcpy(buffer->data() + buffer->size(), "\x00\x00\x00\x01", 4);
	memcpy(buffer->data() + buffer->size() + 4, ptr, length);
	buffer->setRange(0, buffer->size() + 4 + length);

	ptr += length;
	size -= length;
	}

	buffer->meta()->setInt32("csd", true);
	buffer->meta()->setInt64("timeUs", 0);
	msg->setBuffer("csd-1", buffer);
	} else if (meta->findData(kKeyESDS, &type, &data, &size)) {
	ESDS esds((const char *)data, size);
	CHECK_EQ(esds.InitCheck(), (status_t)OK);

	const void *codec_specific_data;
	size_t codec_specific_data_size;
	esds.getCodecSpecificInfo(
	&codec_specific_data, &codec_specific_data_size);

	sp<ABuffer> buffer = new ABuffer(codec_specific_data_size);

	memcpy(buffer->data(), codec_specific_data,
	codec_specific_data_size);

	buffer->meta()->setInt32("csd", true);
	buffer->meta()->setInt64("timeUs", 0);
	msg->setBuffer("csd-0", buffer);
	} else if (meta->findData(kKeyVorbisInfo, &type, &data, &size)) {
	sp<ABuffer> buffer = new ABuffer(size);
	memcpy(buffer->data(), data, size);

	buffer->meta()->setInt32("csd", true);
	buffer->meta()->setInt64("timeUs", 0);
	msg->setBuffer("csd-0", buffer);

	if (!meta->findData(kKeyVorbisBooks, &type, &data, &size)) {
	return -EINVAL;
	}

	buffer = new ABuffer(size);
	memcpy(buffer->data(), data, size);

	buffer->meta()->setInt32("csd", true);
	buffer->meta()->setInt64("timeUs", 0);
	msg->setBuffer("csd-1", buffer);
	}

	*format = msg;

	return OK;
	}

	static size_t reassembleAVCC(const sp<ABuffer> &csd0, const sp<ABuffer> csd1, char *avcc) {

	avcc[0] = 1; // version
	avcc[1] = 0x64; // profile
	avcc[2] = 0; // unused (?)
	avcc[3] = 0xd; // level
	avcc[4] = 0xff; // reserved+size

	size_t i = 0;
	int numparams = 0;
	int lastparamoffset = 0;
	int avccidx = 6;
	do {
	if (i >= csd0->size() - 4 \|\|
	memcmp(csd0->data() + i, "\x00\x00\x00\x01", 4) == 0) {
	if (i >= csd0->size() - 4) {
	// there can't be another param here, so use all the rest
	i = csd0->size();
	}
	ALOGV("block at %d, last was %d", i, lastparamoffset);
	if (lastparamoffset > 0) {
	int size = i - lastparamoffset;
	avcc[avccidx++] = size >> 8;
	avcc[avccidx++] = size & 0xff;
	memcpy(avcc+avccidx, csd0->data() + lastparamoffset, size);
	avccidx += size;
	numparams++;
	}
	i += 4;
	lastparamoffset = i;
	} else {
	i++;
	}
	} while(i < csd0->size());
	ALOGV("csd0 contains %d params", numparams);

	avcc[5] = 0xe0 \| numparams;
	//and now csd-1
	i = 0;
	numparams = 0;
	lastparamoffset = 0;
	int numpicparamsoffset = avccidx;
	avccidx++;
	do {
	if (i >= csd1->size() - 4 \|\|
	memcmp(csd1->data() + i, "\x00\x00\x00\x01", 4) == 0) {
	if (i >= csd1->size() - 4) {
	// there can't be another param here, so use all the rest
	i = csd1->size();
	}
	ALOGV("block at %d, last was %d", i, lastparamoffset);
	if (lastparamoffset > 0) {
	int size = i - lastparamoffset;
	avcc[avccidx++] = size >> 8;
	avcc[avccidx++] = size & 0xff;
	memcpy(avcc+avccidx, csd1->data() + lastparamoffset, size);
	avccidx += size;
	numparams++;
	}
	i += 4;
	lastparamoffset = i;
	} else {
	i++;
	}
	} while(i < csd1->size());
	avcc[numpicparamsoffset] = numparams;
	return avccidx;
	}

	static void reassembleESDS(const sp<ABuffer> &csd0, char *esds) {
	int csd0size = csd0->size();
	esds[0] = 3; // kTag_ESDescriptor;
	int esdescriptorsize = 26 + csd0size;
	CHECK(esdescriptorsize < 268435456); // 7 bits per byte, so max is 2^28-1
	esds[1] = 0x80 \| (esdescriptorsize >> 21);
	esds[2] = 0x80 \| ((esdescriptorsize >> 14) & 0x7f);
	esds[3] = 0x80 \| ((esdescriptorsize >> 7) & 0x7f);
	esds[4] = (esdescriptorsize & 0x7f);
	esds[5] = esds[6] = 0; // es id
	esds[7] = 0; // flags
	esds[8] = 4; // kTag_DecoderConfigDescriptor
	int configdescriptorsize = 18 + csd0size;
	esds[9] = 0x80 \| (configdescriptorsize >> 21);
	esds[10] = 0x80 \| ((configdescriptorsize >> 14) & 0x7f);
	esds[11] = 0x80 \| ((configdescriptorsize >> 7) & 0x7f);
	esds[12] = (configdescriptorsize & 0x7f);
	esds[13] = 0x40; // objectTypeIndication
	esds[14] = 0x15; // not sure what 14-25 mean, they are ignored by ESDS.cpp,
	esds[15] = 0x00; // but the actual values here were taken from a real file.
	esds[16] = 0x18;
	esds[17] = 0x00;
	esds[18] = 0x00;
	esds[19] = 0x00;
	esds[20] = 0xfa;
	esds[21] = 0x00;
	esds[22] = 0x00;
	esds[23] = 0x00;
	esds[24] = 0xfa;
	esds[25] = 0x00;
	esds[26] = 5; // kTag_DecoderSpecificInfo;
	esds[27] = 0x80 \| (csd0size >> 21);
	esds[28] = 0x80 \| ((csd0size >> 14) & 0x7f);
	esds[29] = 0x80 \| ((csd0size >> 7) & 0x7f);
	esds[30] = (csd0size & 0x7f);
	memcpy((void*)&esds[31], csd0->data(), csd0size);
	// data following this is ignored, so don't bother appending it

	}

	void convertMessageToMetaData(const sp<AMessage> &msg, sp<MetaData> &meta) {
	AString mime;
	if (msg->findString("mime", &mime)) {
	meta->setCString(kKeyMIMEType, mime.c_str());
	} else {
	ALOGW("did not find mime type");
	}

	int64_t durationUs;
	if (msg->findInt64("durationUs", &durationUs)) {
	meta->setInt64(kKeyDuration, durationUs);
	}

	if (mime.startsWith("video/")) {
	int32_t width;
	int32_t height;
	if (msg->findInt32("width", &width) && msg->findInt32("height", &height)) {
	meta->setInt32(kKeyWidth, width);
	meta->setInt32(kKeyHeight, height);
	} else {
	ALOGW("did not find width and/or height");
	}
	} else if (mime.startsWith("audio/")) {
	int32_t numChannels;
	if (msg->findInt32("channel-count", &numChannels)) {
	meta->setInt32(kKeyChannelCount, numChannels);
	}
	int32_t sampleRate;
	if (msg->findInt32("sample-rate", &sampleRate)) {
	meta->setInt32(kKeySampleRate, sampleRate);
	}
	int32_t channelMask;
	if (msg->findInt32("channel-mask", &channelMask)) {
	meta->setInt32(kKeyChannelMask, channelMask);
	}
	int32_t delay = 0;
	if (msg->findInt32("encoder-delay", &delay)) {
	meta->setInt32(kKeyEncoderDelay, delay);
	}
	int32_t padding = 0;
	if (msg->findInt32("encoder-padding", &padding)) {
	meta->setInt32(kKeyEncoderPadding, padding);
	}

	int32_t isADTS;
	if (msg->findInt32("is-adts", &isADTS)) {
	meta->setInt32(kKeyIsADTS, isADTS);
	}
	}

	int32_t maxInputSize;
	if (msg->findInt32("max-input-size", &maxInputSize)) {
	meta->setInt32(kKeyMaxInputSize, maxInputSize);
	}

	// reassemble the csd data into its original form
	sp<ABuffer> csd0;
	if (msg->findBuffer("csd-0", &csd0)) {
	if (mime.startsWith("video/")) { // do we need to be stricter than this?
	sp<ABuffer> csd1;
	if (msg->findBuffer("csd-1", &csd1)) {
	char avcc[1024]; // that oughta be enough, right?
	size_t outsize = reassembleAVCC(csd0, csd1, avcc);
	meta->setData(kKeyAVCC, kKeyAVCC, avcc, outsize);
	}
	} else if (mime.startsWith("audio/")) {
	int csd0size = csd0->size();
	char esds[csd0size + 31];
	reassembleESDS(csd0, esds);
	meta->setData(kKeyESDS, kKeyESDS, esds, sizeof(esds));
	}
	}

	// XXX TODO add whatever other keys there are

	#if 0
	ALOGI("converted %s to:", msg->debugString(0).c_str());
	meta->dumpToLog();
	#endif
	}


	} // namespace android