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BPI-CM9-Linux/aml-comp/multimedia/aml_mp_sdk/demux/AmlESQueue.cpp
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2026-08-13 11:28:40 +08:00
/*
* Copyright (c) 2020 Amlogic, Inc. All rights reserved.
*
* This source code is subject to the terms and conditions defined in the
* file 'LICENSE' which is part of this source code package.
*
* Description:
*/
//#define LOG_NDEBUG 0
#define LOG_TAG "AmlMpPlayerDemo_ESQueue"
#include <utils/AmlMpLog.h>
#include <utils/AmlMpBuffer.h>
#include <utils/AmlMpBitReader.h>
#include <utils/AmlMpUtils.h>
#include <vector>
#include "AmlESQueue.h"
static const char* mName = LOG_TAG;
namespace aml_mp {
static const int kPesHeaderSize = 14;
static bool IsSeeminglyValidADTSHeader(
const uint8_t *ptr, size_t size, size_t *frameLength) {
if (size < 7) {
// Not enough data to verify header.
return false;
}
if (ptr[0] != 0xff || (ptr[1] >> 4) != 0x0f) {
return false;
}
unsigned layer = (ptr[1] >> 1) & 3;
if (layer != 0) {
return false;
}
unsigned ID = (ptr[1] >> 3) & 1;
unsigned profile_ObjectType = ptr[2] >> 6;
if (ID == 1 && profile_ObjectType == 3) {
// MPEG-2 profile 3 is reserved.
return false;
}
size_t frameLengthInHeader =
((ptr[3] & 3) << 11) + (ptr[4] << 3) + ((ptr[5] >> 5) & 7);
if (frameLengthInHeader > size) {
return false;
}
*frameLength = frameLengthInHeader;
return true;
}
static bool IsSeeminglyValidMPEGAudioHeader(const uint8_t *ptr, size_t size) {
if (size < 3) {
// Not enough data to verify header.
return false;
}
if (ptr[0] != 0xff || (ptr[1] >> 5) != 0x07) {
return false;
}
unsigned ID = (ptr[1] >> 3) & 3;
if (ID == 1) {
return false; // reserved
}
unsigned layer = (ptr[1] >> 1) & 3;
if (layer == 0) {
return false; // reserved
}
unsigned bitrateIndex = (ptr[2] >> 4);
if (bitrateIndex == 0x0f) {
return false; // reserved
}
unsigned samplingRateIndex = (ptr[2] >> 2) & 3;
if (samplingRateIndex == 3) {
return false; // reserved
}
return true;
}
// Parse AC3 header assuming the current ptr is start position of syncframe,
// update metadata only applicable, and return the payload size
static unsigned parseAC3SyncFrame(
const uint8_t *ptr, size_t size) {
static const unsigned channelCountTable[] = {2, 1, 2, 3, 3, 4, 4, 5};
static const unsigned samplingRateTable[] = {48000, 44100, 32000};
static const unsigned frameSizeTable[19][3] = {
{ 64, 69, 96 },
{ 80, 87, 120 },
{ 96, 104, 144 },
{ 112, 121, 168 },
{ 128, 139, 192 },
{ 160, 174, 240 },
{ 192, 208, 288 },
{ 224, 243, 336 },
{ 256, 278, 384 },
{ 320, 348, 480 },
{ 384, 417, 576 },
{ 448, 487, 672 },
{ 512, 557, 768 },
{ 640, 696, 960 },
{ 768, 835, 1152 },
{ 896, 975, 1344 },
{ 1024, 1114, 1536 },
{ 1152, 1253, 1728 },
{ 1280, 1393, 1920 },
};
AmlMpBitReader bits(ptr, size);
if (bits.numBitsLeft() < 16) {
return 0;
}
if (bits.getBits(16) != 0x0B77) {
return 0;
}
if (bits.numBitsLeft() < 16 + 2 + 6 + 5 + 3 + 3) {
MLOGV("Not enough bits left for further parsing");
return 0;
}
bits.skipBits(16); // crc1
unsigned fscod = bits.getBits(2);
if (fscod == 3) {
MLOGW("Incorrect fscod in AC3 header");
return 0;
}
unsigned frmsizecod = bits.getBits(6);
if (frmsizecod > 37) {
MLOGW("Incorrect frmsizecod in AC3 header");
return 0;
}
unsigned bsid = bits.getBits(5);
if (bsid > 8) {
MLOGW("Incorrect bsid in AC3 header. Possibly E-AC-3?");
return 0;
}
bits.skipBits(3); // bsmod
unsigned acmod = bits.getBits(3);
if ((acmod & 1) > 0 && acmod != 1) {
if (bits.numBitsLeft() < 2) {
return 0;
}
bits.skipBits(2); //cmixlev
}
if ((acmod & 4) > 0) {
if (bits.numBitsLeft() < 2) {
return 0;
}
bits.skipBits(2); //surmixlev
}
if (acmod == 2) {
if (bits.numBitsLeft() < 2) {
return 0;
}
bits.skipBits(2); //dsurmod
}
if (bits.numBitsLeft() < 1) {
return 0;
}
unsigned lfeon = bits.getBits(1);
unsigned samplingRate = samplingRateTable[fscod];
unsigned payloadSize = frameSizeTable[frmsizecod >> 1][fscod];
if (fscod == 1) {
payloadSize += frmsizecod & 1;
}
payloadSize <<= 1; // convert from 16-bit words to bytes
unsigned channelCount = channelCountTable[acmod] + lfeon;
return payloadSize;
}
// Parse EAC3 header assuming the current ptr is start position of syncframe,
// update metadata only applicable, and return the payload size
// ATSC A/52:2012 E2.3.1
static unsigned parseEAC3SyncFrame(
const uint8_t *ptr, size_t size) {
static const unsigned channelCountTable[] = {2, 1, 2, 3, 3, 4, 4, 5};
static const unsigned samplingRateTable[] = {48000, 44100, 32000};
static const unsigned samplingRateTable2[] = {24000, 22050, 16000};
AmlMpBitReader bits(ptr, size);
if (bits.numBitsLeft() < 16) {
MLOGE("Not enough bits left for further parsing");
return 0;
}
if (bits.getBits(16) != 0x0B77) {
MLOGE("No valid sync word in EAC3 header");
return 0;
}
// we parse up to bsid so there needs to be at least that many bits
if (bits.numBitsLeft() < 2 + 3 + 11 + 2 + 2 + 3 + 1 + 5) {
MLOGE("Not enough bits left for further parsing");
return 0;
}
unsigned strmtyp = bits.getBits(2);
if (strmtyp == 3) {
MLOGE("Incorrect strmtyp in EAC3 header");
return 0;
}
unsigned substreamid = bits.getBits(3);
// only the first independent stream is supported
if ((strmtyp == 0 || strmtyp == 2) && substreamid != 0)
return 0;
unsigned frmsiz = bits.getBits(11);
unsigned fscod = bits.getBits(2);
unsigned samplingRate = 0;
if (fscod == 0x3) {
unsigned fscod2 = bits.getBits(2);
if (fscod2 == 3) {
MLOGW("Incorrect fscod2 in EAC3 header");
return 0;
}
samplingRate = samplingRateTable2[fscod2];
} else {
samplingRate = samplingRateTable[fscod];
bits.skipBits(2); // numblkscod
}
unsigned acmod = bits.getBits(3);
unsigned lfeon = bits.getBits(1);
unsigned bsid = bits.getBits(5);
if (bsid < 11 || bsid > 16) {
MLOGW("Incorrect bsid in EAC3 header. Could be AC-3 or some unknown EAC3 format");
return 0;
}
unsigned payloadSize = frmsiz + 1;
payloadSize <<= 1; // convert from 16-bit words to bytes
return payloadSize;
}
////////////////////////////////////////////////////////////////////////////////
ElementaryStreamQueue::ElementaryStreamQueue(Mode mode)
: mMode(mode)
{
}
void ElementaryStreamQueue::clear()
{
if (mBuffer != nullptr) {
mBuffer->setRange(0, 0);
}
mRangeInfos.clear();
mAUIndex = 0;
}
int ElementaryStreamQueue::appendData(const void* data, size_t size, int64_t pts, int32_t payloadOffset)
{
if (mBuffer == nullptr || mBuffer->size() == 0) {
switch (mMode) {
case H264:
case H265:
case MPEG_VIDEO:
{
uint8_t *ptr = (uint8_t *)data;
ssize_t startOffset = -1;
for (size_t i = 0; i+2 < size; ++i) {
if (!memcmp("\x00\x00\x01", &ptr[i], 3)) {
startOffset = i;
break;
}
}
if (startOffset < 0) {
return -1;
}
data = &ptr[startOffset];
size -= startOffset;
}
break;
case MPEG4_VIDEO:
{
uint8_t* ptr = (uint8_t*)data;
ssize_t startOffset = -1;
for (size_t i = 0; i+2 < size; ++i) {
if (!memcmp("\x00\x00\x01", &ptr[i], 3)) {
startOffset = i;
break;
}
}
if (startOffset < 0) {
return -1;
}
data = &ptr[startOffset];
size -= startOffset;
break;
}
case AAC:
{
uint8_t* ptr = (uint8_t*)data;
ssize_t startOffset = -1;
size_t frameLength;
for (size_t i = 0; i < size; ++i) {
if (IsSeeminglyValidADTSHeader(&ptr[i], size -i, &frameLength)) {
startOffset = i;
break;
}
}
if (startOffset < 0) {
return -1;
}
if (startOffset > 0) {
ALOGI("found something resembling an AAC syncword at "
"offset %zd", startOffset);
}
if (frameLength != size - startOffset) {
MLOGV( "First ADTS AAC frame length is %zd bytes, "
"while the buffer size is %zd bytes, startOffset:%zd.",
frameLength, size - startOffset, startOffset);
}
data = &ptr[startOffset];
size -= startOffset;
break;
}
case AC3:
case EAC3:
{
uint8_t *ptr = (uint8_t *)data;
ssize_t startOffset = -1;
for (size_t i = 0; i < size; ++i) {
unsigned payloadSize = 0;
if (mMode == AC3) {
payloadSize = parseAC3SyncFrame(&ptr[i], size - i);
} else if (mMode == EAC3) {
payloadSize = parseEAC3SyncFrame(&ptr[i], size - i);
}
if (payloadSize > 0) {
startOffset = i;
break;
}
}
if (startOffset < 0) {
return -1;
}
if (startOffset > 0) {
ALOGI("found something resembling an (E)AC3 syncword at "
"offset %zd",
startOffset);
}
data = &ptr[startOffset];
size -= startOffset;
break;
}
case MPEG_AUDIO:
{
uint8_t* ptr = (uint8_t*) data;
ssize_t startOffset = -1;
for (size_t i = 0; i < size; ++i) {
if (IsSeeminglyValidMPEGAudioHeader(&ptr[i], size - i)) {
startOffset = i;
break;
}
}
if (startOffset < 0) {
return -1;
}
data = &ptr[startOffset];
size -= startOffset;
break;
}
default:
return -1;
}
}
size_t neededSize = (mBuffer == NULL ? 0 : mBuffer->size()) + size;
if (mBuffer == NULL || neededSize > mBuffer->capacity()) {
neededSize = (neededSize + 65535) & ~65535;
MLOGI("resizing buffer to size %zu", neededSize);
sptr<AmlMpBuffer> buffer = new AmlMpBuffer(neededSize);
if (mBuffer != NULL) {
memcpy(buffer->data(), mBuffer->data(), mBuffer->size());
buffer->setRange(0, mBuffer->size());
} else {
buffer->setRange(0, 0);
}
mBuffer = buffer;
}
memcpy(mBuffer->data() + mBuffer->size(), data, size);
mBuffer->setRange(0, mBuffer->size() + size);
RangeInfo info;
info.mLength = size;
info.mPts = pts;
info.mPesOffset = payloadOffset;
mRangeInfos.push_back(info);
return 0;
}
sptr<AmlMpBuffer> ElementaryStreamQueue::dequeueAccessUnit()
{
if (mBuffer == nullptr) {
return nullptr;
}
switch (mMode) {
case H264:
return dequeueAccessUnitH264();
case H265:
return dequeueAccessUnitH265();
case AAC:
return dequeueAccessUnitAAC();
case AC3:
case EAC3:
return dequeueAccessUnitEAC3();
case MPEG_VIDEO:
return dequeueAccessUnitMPEGVideo();
case MPEG4_VIDEO:
return dequeueAccessUnitMPEG4Video();
case MPEG_AUDIO:
return dequeueAccessUnitMPEGAudio();
default:
return nullptr;
}
}
struct NALPosition {
uint32_t nalOffset;
uint32_t nalSize;
};
int getNextNALUnit(
const uint8_t **_data, size_t *_size,
const uint8_t **nalStart, size_t *nalSize,
bool startCodeFollows = false) {
const uint8_t *data = *_data;
size_t size = *_size;
*nalStart = NULL;
*nalSize = 0;
if (size < 3) {
return -EAGAIN;
}
size_t offset = 0;
// A valid startcode consists of at least two 0x00 bytes followed by 0x01.
for (; offset + 2 < size; ++offset) {
if (data[offset + 2] == 0x01 && data[offset] == 0x00
&& data[offset + 1] == 0x00) {
break;
}
}
if (offset + 2 >= size) {
*_data = &data[offset];
*_size = 2;
return -EAGAIN;
}
offset += 3;
size_t startOffset = offset;
for (;;) {
while (offset < size && data[offset] != 0x01) {
++offset;
}
if (offset == size) {
if (startCodeFollows) {
offset = size + 2;
break;
}
return -EAGAIN;
}
if (data[offset - 1] == 0x00 && data[offset - 2] == 0x00) {
break;
}
++offset;
}
size_t endOffset = offset - 2;
while (endOffset > startOffset + 1 && data[endOffset - 1] == 0x00) {
--endOffset;
}
// avoid overflow
if (endOffset < startOffset) {
*nalStart = NULL;
*nalSize = 0;
return -EAGAIN;
}
*nalStart = &data[startOffset];
*nalSize = endOffset - startOffset;
if (offset + 2 < size) {
*_data = &data[offset - 2];
*_size = size - offset + 2;
} else {
*_data = NULL;
*_size = 0;
}
return 0;
}
static sptr<AmlMpBuffer> FindNAL(const uint8_t *data, size_t size, unsigned nalType) {
const uint8_t *nalStart;
size_t nalSize;
while (getNextNALUnit(&data, &size, &nalStart, &nalSize, true) == 0) {
if (nalSize > 0 && (nalStart[0] & 0x1f) == nalType) {
sptr<AmlMpBuffer> buffer = new AmlMpBuffer(nalSize);
memcpy(buffer->data(), nalStart, nalSize);
return buffer;
}
}
return NULL;
}
unsigned parseUE(AmlMpBitReader *br) {
unsigned numZeroes = 0;
while (br->getBits(1) == 0) {
++numZeroes;
}
unsigned x = br->getBits(numZeroes);
return x + (1u << numZeroes) - 1;
}
sptr<AmlMpBuffer> ElementaryStreamQueue::dequeueAccessUnitH264()
{
const uint8_t* data = mBuffer->data();
size_t size = mBuffer->size();
std::vector<NALPosition> nals;
size_t totalSize = 0;
size_t seiCount = 0;
int err;
const uint8_t* nalStart;
size_t nalSize;
bool foundSlice = false;
bool foundIDR = false;
while ((err = getNextNALUnit(&data, &size, &nalStart, &nalSize)) == 0) {
if (nalSize == 0) continue;
unsigned nalType = nalStart[0] & 0x1f;
bool flush = false;
if (nalType == 1 || nalType == 5) {
if (nalType == 5) {
foundIDR = true;
}
if (foundSlice) {
AmlMpBitReader br(nalStart + 1, nalSize);
unsigned first_mb_in_slice = parseUE(&br);
if (first_mb_in_slice == 0) {
flush = true;
}
}
foundSlice = true;
} else if ((nalType == 9 || nalType == 7) && foundSlice) {
flush = true;
} else if (nalType == 6 && nalSize > 0) {
++seiCount;
}
if (flush) {
size_t auSize = 4 * nals.size() + totalSize;
sptr<AmlMpBuffer> accessUnit = new AmlMpBuffer(auSize + kPesHeaderSize);
size_t dstOffset = kPesHeaderSize;
for (size_t i = 0; i < nals.size(); ++i) {
const NALPosition &pos = nals.at(i);
unsigned nalType = mBuffer->data()[pos.nalOffset] & 0x1f;
memcpy(accessUnit->data() + dstOffset, "\x00\x00\x00\x01", 4);
memcpy(accessUnit->data() + dstOffset + 4, mBuffer->data() + pos.nalOffset, pos.nalSize);
dstOffset += pos.nalSize + 4;
}
const NALPosition &pos = nals.at(nals.size() - 1);
size_t nextScan = pos.nalOffset + pos.nalSize;
memmove(mBuffer->data(),
mBuffer->data() + nextScan,
mBuffer->size() - nextScan);
mBuffer->setRange(0, mBuffer->size() - nextScan);
int64_t pts = fetchTimestamp(nextScan);
if (pts < 0) {
return nullptr;
}
makePESHeader(accessUnit->data(), accessUnit->capacity(), auSize, pts);
MLOGV("dequeueAccessUnitH264[%d]: AU %p(%zu) dstOffset:%zu, nals:%zu, totalSize:%zu,auSize:%zu, PTS:%.3fs",
mAUIndex, accessUnit->data(), accessUnit->size(),
dstOffset, nals.size(), totalSize, auSize, pts/9e4);
++mAUIndex;
//std::string result;
//hexdump(accessUnit->data(), std::min(accessUnit->size(), (size_t)32), result);
//MLOGV("h264:%s", result.c_str());
return accessUnit;
}
NALPosition pos;
pos.nalOffset = nalStart - mBuffer->data();
pos.nalSize = nalSize;
nals.push_back(pos);
totalSize += nalSize;
}
return nullptr;
}
sptr<AmlMpBuffer> ElementaryStreamQueue::dequeueAccessUnitH265()
{
const uint8_t* data = mBuffer->data();
size_t size = mBuffer->size();
std::vector<NALPosition> nals;
size_t totalSize = 0;
size_t seiCount = 0;
int err;
const uint8_t* nalStart;
size_t nalSize;
bool frame_start_found = false;
int preVCLIndex = -1; // number of nals until VCL type found
while ((err = getNextNALUnit(&data, &size, &nalStart, &nalSize)) == 0) {
if (nalSize == 0) continue;
unsigned nalType = (nalStart[0]>>1) & 0x3f;
bool flush = false;
if ((nalType >= 32 && nalType <= 35) || nalType == 39 ||
(nalType >= 41 && nalType <= 44) || (nalType >= 48 && nalType <= 55)) {
if (frame_start_found && (preVCLIndex > 0)) {
flush = true;
}
} else if (nalType <= 9 || (nalType >= 16 && nalType <= 21)) {
if (frame_start_found) {
int first_slice_segment_in_pic_flag = (nalStart[2] & 0x80) >> 7;
if (first_slice_segment_in_pic_flag && preVCLIndex > 0 && frame_start_found) {
flush = true;
}
}
frame_start_found = true;
}
if (flush) {
size_t auSize = 4 * nals.size() + totalSize;
sptr<AmlMpBuffer> accessUnit = new AmlMpBuffer(auSize + kPesHeaderSize);
size_t dstOffset = kPesHeaderSize;
for (size_t i = 0; i < nals.size(); ++i) {
const NALPosition &pos = nals.at(i);
memcpy(accessUnit->data() + dstOffset, "\x00\x00\x00\x01", 4);
memcpy(accessUnit->data() + dstOffset + 4, mBuffer->data() + pos.nalOffset, pos.nalSize);
dstOffset += pos.nalSize + 4;
}
const NALPosition &pos = nals.at(nals.size() - 1);
size_t nextScan = pos.nalOffset + pos.nalSize;
memmove(mBuffer->data(),
mBuffer->data() + nextScan,
mBuffer->size() - nextScan);
mBuffer->setRange(0, mBuffer->size() - nextScan);
int64_t pts = fetchTimestamp(nextScan);
if (pts < 0) {
return nullptr;
}
makePESHeader(accessUnit->data(), accessUnit->capacity(), auSize, pts);
MLOGV("dequeueAccessUnitH265[%d]: AU %p(%zu) dstOffset:%zu, nals:%zu, totalSize:%zu,auSize:%zu, PTS:%.3fs",
mAUIndex, accessUnit->data(), accessUnit->size(),
dstOffset, nals.size(), totalSize, auSize, pts/9e4);
++mAUIndex;
//std::string result;
//hexdump(accessUnit->data(), std::min(accessUnit->size(), (size_t)32), result);
//MLOGV("h264:%s", result.c_str());
return accessUnit;
}
NALPosition pos;
pos.nalOffset = nalStart - mBuffer->data();
pos.nalSize = nalSize;
nals.push_back(pos);
totalSize += nalSize;
if (nalType < 32) { // VCL type
preVCLIndex = nals.size();
}
}
return nullptr;
}
sptr<AmlMpBuffer> ElementaryStreamQueue::dequeueAccessUnitAAC()
{
if (mBuffer->size() == 0) {
return nullptr;
}
if (mRangeInfos.empty()) {
return nullptr;
}
const RangeInfo &info = *mRangeInfos.begin();
if (info.mLength == 0 || mBuffer->size() < info.mLength) {
return nullptr;
}
if (info.mPts < 0) {
MLOGE("Negative info.mPts");
return nullptr;
}
struct ADTSPosition {
size_t offset;
size_t headerSize;
size_t length;
};
std::vector<ADTSPosition> frames;
size_t offset = 0;
while (offset < info.mLength) {
if (offset + 7 > mBuffer->size()) {
return nullptr;
}
AmlMpBitReader bits(mBuffer->data() + offset, mBuffer->size() - offset);
if (bits.getBits(12) != 0xfffu) {
//MLOGE("Wrong adts_fixed_header");
++offset;
continue;
}
bits.skipBits(3); // ID, layer
bool protection_absent = bits.getBits(1) != 0;
bits.skipBits(12);
bits.skipBits(2);
unsigned aac_frame_length = bits.getBits(13);
if (aac_frame_length == 0) {
MLOGE("Invalid AAC frame length!");
return nullptr;
}
bits.skipBits(11); // adts_buffer_fullness
unsigned number_of_raw_data_blocks_in_frame = bits.getBits(2);
if (number_of_raw_data_blocks_in_frame != 0) {
MLOGE("Should not reach here.");
return NULL;
}
if (offset + aac_frame_length > mBuffer->size()) {
return NULL;
}
size_t headerSize = protection_absent ? 7 : 9;
ADTSPosition frame = {
.offset = offset,
.headerSize = headerSize,
.length = aac_frame_length,
};
frames.push_back(frame);
offset += aac_frame_length;
}
int64_t pts = fetchTimestamp(offset);
if (pts < 0ll) {
MLOGE("negative pts");
return nullptr;
}
sptr<AmlMpBuffer> accessUnit = new AmlMpBuffer(offset + kPesHeaderSize);
size_t pesHeaderSize = makePESHeader(accessUnit->data(), accessUnit->capacity(), offset, pts);
memcpy(accessUnit->data() + pesHeaderSize, mBuffer->data(), offset);
MLOGV("dequeueAccessUnit_AAC[%d]: AU:%p(%zu) offset:%zu, info.mLength %zu, frames:%zu, PTS:%.3fs",
mAUIndex, accessUnit->data(), accessUnit->size(),
offset,
info.mLength,
frames.size(),
pts/9e4);
mAUIndex++;
memmove(mBuffer->data(), mBuffer->data() + offset,
mBuffer->size() - offset);
mBuffer->setRange(0, mBuffer->size() - offset);
return accessUnit;
}
sptr<AmlMpBuffer> ElementaryStreamQueue::dequeueAccessUnitEAC3()
{
unsigned syncStartPos = 0; // in bytes
unsigned payloadSize = 0;
MLOGV("dequeueAccessUnitEAC3[%d]: mBuffer %p(%zu)", mAUIndex,
mBuffer->data(), mBuffer->size());
while (true) {
if (syncStartPos + 2 >= mBuffer->size()) {
return NULL;
}
uint8_t *ptr = mBuffer->data() + syncStartPos;
size_t size = mBuffer->size() - syncStartPos;
if (mMode == AC3) {
payloadSize = parseAC3SyncFrame(ptr, size);
} else if (mMode == EAC3) {
payloadSize = parseEAC3SyncFrame(ptr, size);
}
if (payloadSize > 0) {
break;
}
MLOGV("dequeueAccessUnitEAC3[%d]: syncStartPos %u payloadSize %u",
mAUIndex, syncStartPos, payloadSize);
++syncStartPos;
}
if (mBuffer->size() < syncStartPos + payloadSize) {
MLOGV("Not enough buffer size for E/AC3");
return NULL;
}
int64_t pts = fetchTimestamp(syncStartPos + payloadSize);
if (pts < 0ll) {
MLOGE("negative pts");
return NULL;
}
mAUIndex++;
sptr<AmlMpBuffer> accessUnit = new AmlMpBuffer(syncStartPos + payloadSize + kPesHeaderSize);
memcpy(accessUnit->data() + kPesHeaderSize, mBuffer->data(), syncStartPos + payloadSize);
makePESHeader(accessUnit->data(), accessUnit->capacity(), syncStartPos + payloadSize, pts);
memmove(
mBuffer->data(),
mBuffer->data() + syncStartPos + payloadSize,
mBuffer->size() - syncStartPos - payloadSize);
mBuffer->setRange(0, mBuffer->size() - syncStartPos - payloadSize);
return accessUnit;
}
uint32_t U32_AT(const uint8_t *ptr) {
return ptr[0] << 24 | ptr[1] << 16 | ptr[2] << 8 | ptr[3];
}
bool GetMPEGAudioFrameSize(
uint32_t header, size_t *frame_size,
int *out_sampling_rate, int *out_channels,
int *out_bitrate, int *out_num_samples) {
*frame_size = 0;
if (out_sampling_rate) {
*out_sampling_rate = 0;
}
if (out_channels) {
*out_channels = 0;
}
if (out_bitrate) {
*out_bitrate = 0;
}
if (out_num_samples) {
*out_num_samples = 1152;
}
if ((header & 0xffe00000) != 0xffe00000) {
return false;
}
unsigned version = (header >> 19) & 3;
if (version == 0x01) {
return false;
}
unsigned layer = (header >> 17) & 3;
if (layer == 0x00) {
return false;
}
// we can get protection value from (header >> 16) & 1
unsigned bitrate_index = (header >> 12) & 0x0f;
if (bitrate_index == 0 || bitrate_index == 0x0f) {
// Disallow "free" bitrate.
return false;
}
unsigned sampling_rate_index = (header >> 10) & 3;
if (sampling_rate_index == 3) {
return false;
}
static const int kSamplingRateV1[] = { 44100, 48000, 32000 };
int sampling_rate = kSamplingRateV1[sampling_rate_index];
if (version == 2 /* V2 */) {
sampling_rate /= 2;
} else if (version == 0 /* V2.5 */) {
sampling_rate /= 4;
}
unsigned padding = (header >> 9) & 1;
if (layer == 3) {
// layer I
static const int kBitrateV1[] = {
32, 64, 96, 128, 160, 192, 224, 256,
288, 320, 352, 384, 416, 448
};
static const int kBitrateV2[] = {
32, 48, 56, 64, 80, 96, 112, 128,
144, 160, 176, 192, 224, 256
};
int bitrate =
(version == 3 /* V1 */)
? kBitrateV1[bitrate_index - 1]
: kBitrateV2[bitrate_index - 1];
if (out_bitrate) {
*out_bitrate = bitrate;
}
*frame_size = (12000 * bitrate / sampling_rate + padding) * 4;
if (out_num_samples) {
*out_num_samples = 384;
}
} else {
// layer II or III
static const int kBitrateV1L2[] = {
32, 48, 56, 64, 80, 96, 112, 128,
160, 192, 224, 256, 320, 384
};
static const int kBitrateV1L3[] = {
32, 40, 48, 56, 64, 80, 96, 112,
128, 160, 192, 224, 256, 320
};
static const int kBitrateV2[] = {
8, 16, 24, 32, 40, 48, 56, 64,
80, 96, 112, 128, 144, 160
};
int bitrate;
if (version == 3 /* V1 */) {
bitrate = (layer == 2 /* L2 */)
? kBitrateV1L2[bitrate_index - 1]
: kBitrateV1L3[bitrate_index - 1];
if (out_num_samples) {
*out_num_samples = 1152;
}
} else {
// V2 (or 2.5)
bitrate = kBitrateV2[bitrate_index - 1];
if (out_num_samples) {
*out_num_samples = (layer == 1 /* L3 */) ? 576 : 1152;
}
}
if (out_bitrate) {
*out_bitrate = bitrate;
}
if (version == 3 /* V1 */) {
*frame_size = 144000 * bitrate / sampling_rate + padding;
} else {
// V2 or V2.5
size_t tmp = (layer == 1 /* L3 */) ? 72000 : 144000;
*frame_size = tmp * bitrate / sampling_rate + padding;
}
}
if (out_sampling_rate) {
*out_sampling_rate = sampling_rate;
}
if (out_channels) {
int channel_mode = (header >> 6) & 3;
*out_channels = (channel_mode == 3) ? 1 : 2;
}
return true;
}
sptr<AmlMpBuffer> ElementaryStreamQueue::dequeueAccessUnitMPEGAudio()
{
const uint8_t *data = mBuffer->data();
size_t size = mBuffer->size();
if (size < 4) {
return nullptr;
}
uint32_t header = U32_AT(data);
size_t frameSize;
int samplingRate, numChannels, bitrate, numSamples;
if (!GetMPEGAudioFrameSize(header, &frameSize, &samplingRate, &numChannels, &bitrate, &numSamples)) {
MLOGE("Failed to get audio frame size");
mBuffer->setRange(0, 0);
return nullptr;
}
if (size < frameSize) {
return nullptr;
}
int64_t pts = fetchTimestamp(frameSize);
if (pts < 0) {
MLOGE("Negative timeUs");
return nullptr;
}
unsigned layer = 4 - ((header >> 17) & 3);
sptr<AmlMpBuffer> accessUnit = new AmlMpBuffer(frameSize + kPesHeaderSize);
size_t pesHeaderSize = makePESHeader(accessUnit->data(), accessUnit->capacity(), frameSize, pts);
memcpy(accessUnit->data() + pesHeaderSize, data, frameSize);
memmove(mBuffer->data(), mBuffer->data() + frameSize, mBuffer->size() - frameSize);
mBuffer->setRange(0, mBuffer->size() - frameSize);
return accessUnit;
}
sptr<AmlMpBuffer> ElementaryStreamQueue::dequeueAccessUnitMPEGVideo()
{
const uint8_t *data = mBuffer->data();
size_t size = mBuffer->size();
std::vector<size_t> userDataPositions;
bool sawPictureStart = false;
int pprevStartCode = -1;
int prevStartCode = -1;
int currentStartCode = -1;
bool gopFound = false;
bool isClosedGop = false;
bool brokenLink = false;
size_t offset = 0;
while (offset + 3 < size) {
if (memcmp(&data[offset], "\x00\x00\x01", 3)) {
++offset;
continue;
}
//coverity[value_overwrite]
pprevStartCode = prevStartCode;
prevStartCode = currentStartCode;
currentStartCode = data[offset + 3];
if (currentStartCode == 0xb3 && mFormat == nullptr) {
memmove(mBuffer->data(), mBuffer->data() + offset, size - offset);
size -= offset;
(void)fetchTimestamp(offset);
offset = 0;
mBuffer->setRange(0, size);
}
if ((prevStartCode == 0xb3 && currentStartCode != 0xb5)
|| (pprevStartCode == 0xb3 && prevStartCode == 0xb5)) {
// seqHeader without/with extension
if (mFormat == nullptr) {
if (size < 7u) {
MLOGE("Size too small");
return NULL;
}
unsigned width =
(data[4] << 4) | data[5] >> 4;
unsigned height =
((data[5] & 0x0f) << 8) | data[6];
mFormat = new AmlMpBuffer(1);
MLOGI("found MPEG2 video codec config (%d x %d)", width, height);
}
}
if (mFormat != nullptr && currentStartCode == 0xb8) {
// GOP layer
if (offset + 7 >= size) {
MLOGE("Size too small");
return NULL;
}
gopFound = true;
isClosedGop = (data[offset + 7] & 0x40) != 0;
brokenLink = (data[offset + 7] & 0x20) != 0;
}
if (mFormat != nullptr && currentStartCode == 0xb2) {
userDataPositions.push_back(offset);
}
if (mFormat != nullptr && currentStartCode == 0x00) {
// Picture start
if (!sawPictureStart) {
sawPictureStart = true;
} else {
sptr<AmlMpBuffer> accessUnit = new AmlMpBuffer(offset + kPesHeaderSize);
int64_t pts = fetchTimestamp(offset);
if (pts < 0LL) {
MLOGE("Negative pts");
return NULL;
}
makePESHeader(accessUnit->data(), accessUnit->capacity(), offset, pts);
memcpy(accessUnit->data() + kPesHeaderSize, data, offset);
MLOGV("dequeueAccessUnitMPEGVideo[%d]: AU %p(%zu) offset:%zu, PTS:%.3fs",
mAUIndex, accessUnit->data(), accessUnit->size(),
offset, pts/9e4);
++mAUIndex;
memmove(mBuffer->data(),
mBuffer->data() + offset,
mBuffer->size() - offset);
mBuffer->setRange(0, mBuffer->size() - offset);
offset = 0;
if (gopFound && (!brokenLink || isClosedGop)) {
//accessUnit->meta()->setInt32("isSync", 1);
}
// hexdump(accessUnit->data(), accessUnit->size());
return accessUnit;
}
}
++offset;
}
return NULL;
}
static ssize_t getNextChunkSize(
const uint8_t *data, size_t size) {
static const char kStartCode[] = "\x00\x00\x01";
// per ISO/IEC 14496-2 6.2.1, a chunk has a 3-byte prefix + 1-byte start code
// we need at least <prefix><start><next prefix> to successfully scan
if (size < 3 + 1 + 3) {
return -EAGAIN;
}
if (memcmp(kStartCode, data, 3)) {
return -EAGAIN;
}
size_t offset = 4;
while (offset + 2 < size) {
if (!memcmp(&data[offset], kStartCode, 3)) {
return offset;
}
++offset;
}
return -EAGAIN;
}
bool ExtractDimensionsFromVOLHeader(
const uint8_t *data, size_t size, int32_t *width, int32_t *height) {
AmlMpBitReader br(&data[4], size - 4);
br.skipBits(1); // random_accessible_vol
unsigned video_object_type_indication = br.getBits(8);
AML_MP_CHECK_NE(video_object_type_indication,
0x21u /* Fine Granularity Scalable */);
if (br.getBits(1)) {
br.skipBits(4); //video_object_layer_verid
br.skipBits(3); //video_object_layer_priority
}
unsigned aspect_ratio_info = br.getBits(4);
if (aspect_ratio_info == 0x0f /* extended PAR */) {
br.skipBits(8); // par_width
br.skipBits(8); // par_height
}
if (br.getBits(1)) { // vol_control_parameters
br.skipBits(2); // chroma_format
br.skipBits(1); // low_delay
if (br.getBits(1)) { // vbv_parameters
br.skipBits(15); // first_half_bit_rate
AML_MP_CHECK(br.getBits(1)); // marker_bit
br.skipBits(15); // latter_half_bit_rate
AML_MP_CHECK(br.getBits(1)); // marker_bit
br.skipBits(15); // first_half_vbv_buffer_size
AML_MP_CHECK(br.getBits(1)); // marker_bit
br.skipBits(3); // latter_half_vbv_buffer_size
br.skipBits(11); // first_half_vbv_occupancy
AML_MP_CHECK(br.getBits(1)); // marker_bit
br.skipBits(15); // latter_half_vbv_occupancy
AML_MP_CHECK(br.getBits(1)); // marker_bit
}
}
unsigned video_object_layer_shape = br.getBits(2);
//CHECK_EQ(video_object_layer_shape, 0x00u [> rectangular <]);
AML_MP_CHECK(br.getBits(1)); // marker_bit
unsigned vop_time_increment_resolution = br.getBits(16);
AML_MP_CHECK(br.getBits(1)); // marker_bit
if (br.getBits(1)) { // fixed_vop_rate
// range [0..vop_time_increment_resolution)
// vop_time_increment_resolution
// 2 => 0..1, 1 bit
// 3 => 0..2, 2 bits
// 4 => 0..3, 2 bits
// 5 => 0..4, 3 bits
// ...
AML_MP_CHECK_GT(vop_time_increment_resolution, 0u);
--vop_time_increment_resolution;
unsigned numBits = 0;
while (vop_time_increment_resolution > 0) {
++numBits;
vop_time_increment_resolution >>= 1;
}
br.skipBits(numBits); // fixed_vop_time_increment
}
AML_MP_CHECK(br.getBits(1)); // marker_bit
unsigned video_object_layer_width = br.getBits(13);
AML_MP_CHECK(br.getBits(1)); // marker_bit
unsigned video_object_layer_height = br.getBits(13);
AML_MP_CHECK(br.getBits(1)); // marker_bit
br.skipBits(1); // interlaced
*width = video_object_layer_width;
*height = video_object_layer_height;
return true;
}
sptr<AmlMpBuffer> ElementaryStreamQueue::dequeueAccessUnitMPEG4Video()
{
uint8_t *data = mBuffer->data();
size_t size = mBuffer->size();
enum {
SKIP_TO_VISUAL_OBJECT_SEQ_START,
EXPECT_VISUAL_OBJECT_START,
EXPECT_VO_START,
EXPECT_VOL_START,
WAIT_FOR_VOP_START,
SKIP_TO_VOP_START,
} state;
if (mFormat == NULL) {
state = SKIP_TO_VISUAL_OBJECT_SEQ_START;
} else {
state = SKIP_TO_VOP_START;
}
int32_t width = -1, height = -1;
size_t offset = 0;
ssize_t chunkSize;
//coverity[tainted_data_return]
while ((chunkSize = getNextChunkSize(
&data[offset], size - offset)) > 0) {
// Coverity: getNextChunkSize may return negative values (-EAGAIN)
// but loop condition chunkSize > 0 ensures we only process positive values
bool discard = false;
unsigned chunkType = data[offset + 3];
switch (state) {
case SKIP_TO_VISUAL_OBJECT_SEQ_START:
{
if (chunkType == 0xb0) {
// Discard anything before this marker.
state = EXPECT_VISUAL_OBJECT_START;
} else {
discard = true;
offset += chunkSize;
MLOGW("b/74114680, advance to next chunk");
}
break;
}
case EXPECT_VISUAL_OBJECT_START:
{
if (chunkType != 0xb5) {
MLOGE("Unexpected chunkType");
return NULL;
}
state = EXPECT_VO_START;
break;
}
case EXPECT_VO_START:
{
if (chunkType > 0x1f) {
MLOGE("Unexpected chunkType");
return NULL;
}
state = EXPECT_VOL_START;
break;
}
case EXPECT_VOL_START:
{
if ((chunkType & 0xf0) != 0x20) {
MLOGE("Wrong chunkType");
return NULL;
}
if (!ExtractDimensionsFromVOLHeader(
&data[offset], chunkSize,
&width, &height)) {
MLOGE("Failed to get dimension");
return NULL;
}
state = WAIT_FOR_VOP_START;
break;
}
case WAIT_FOR_VOP_START:
{
if (chunkType == 0xb3 || chunkType == 0xb6) {
// group of VOP or VOP start.
mFormat = new AmlMpBuffer(1);
MLOGI("found MPEG4 video codec config (%d x %d), chunkType:%#x",
width, height, chunkType);
// hexdump(csd->data(), csd->size());
//discard = true;
state = SKIP_TO_VOP_START;
}
break;
}
case SKIP_TO_VOP_START:
{
if (chunkType == 0xb6) {
int vopCodingType = (data[offset + 4] & 0xc0) >> 6;
offset += chunkSize;
sptr<AmlMpBuffer> accessUnit = new AmlMpBuffer(offset + kPesHeaderSize);
memcpy(accessUnit->data() + kPesHeaderSize, data, offset);
memmove(data, &data[offset], size - offset);
size -= offset;
mBuffer->setRange(0, size);
int64_t pts = fetchTimestamp(offset);
if (pts < 0LL) {
MLOGE("Negative pts");
return NULL;
}
makePESHeader(accessUnit->data(), accessUnit->capacity(), offset, pts);
//coverity[assigned_value]
offset = 0;
//if (vopCodingType == 0) { // intra-coded VOP
//accessUnit->meta()->setInt32("isSync", 1);
//}
MLOGV("returning MPEG4 video access unit at time %.3fs",
pts/9e4);
// hexdump(accessUnit->data(), accessUnit->size());
return accessUnit;
} else if (chunkType != 0xb3) {
//offset += chunkSize;
//discard = true;
}
break;
}
default:
MLOGE("Unknown state: %d", state);
return NULL;
}
if (discard) {
(void)fetchTimestamp(offset);
memmove(data, &data[offset], size - offset);
size -= offset;
offset = 0;
mBuffer->setRange(0, size);
} else {
offset += chunkSize;
}
}
return NULL;
}
int64_t ElementaryStreamQueue::fetchTimestamp(
size_t size, int32_t *pesOffset) {
int64_t pts = -1;
bool first = true;
while (size > 0) {
if (mRangeInfos.empty()) {
return pts;
}
RangeInfo *info = &*mRangeInfos.begin();
if (first) {
pts = info->mPts;
if (pesOffset != NULL) {
*pesOffset = info->mPesOffset;
}
first = false;
}
if (info->mLength > size) {
info->mLength -= size;
size = 0;
} else {
size -= info->mLength;
mRangeInfos.erase(mRangeInfos.begin());
//coverity[assigned_pointer]
info = NULL;
}
}
return pts;
}
size_t ElementaryStreamQueue::makePESHeader(uint8_t* data, size_t size, size_t frameLength, int64_t pts)
{
if (size < 14) {
return 0;
}
uint8_t* p = data;
p[0] = 0x00;
p[1] = 0x00;
p[2] = 0x01;
p += 3;
p[0] = 0xE0;
++p;
int pes_packet_length = 8 + frameLength;
if (pes_packet_length <= 65535) {
p[0] = pes_packet_length >> 8;
p[1] = pes_packet_length & 0xff;
} else {
p[0] = 0;
p[1] = 0;
}
p += 2;
p[0] = 0x80;
p[1] = 0x80;
p[2] = 5; //PTS size
p += 3;
p[0] = 0x20 | (pts>>29&0x0e) | 0x01;
p[1] = pts>>22 & 0xff;
p[2] = (pts>>14 & 0xfe) | 0x01;
p[3] = pts>>7 & 0xff;
p[4] = (pts<<1 & 0xfe) | 0x01;
p += 5;
return p - data;
}
}
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