| /* |
| * Copyright (C) 2010 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 "ESQueue" |
| #include <media/stagefright/foundation/ADebug.h> |
| |
| #include "ESQueue.h" |
| |
| #include <media/stagefright/foundation/hexdump.h> |
| #include <media/stagefright/foundation/ABitReader.h> |
| #include <media/stagefright/foundation/ABuffer.h> |
| #include <media/stagefright/foundation/AMessage.h> |
| #include <media/stagefright/MediaErrors.h> |
| #include <media/stagefright/MediaDefs.h> |
| #include <media/stagefright/MetaData.h> |
| |
| #include "include/avc_utils.h" |
| |
| namespace android { |
| |
| ElementaryStreamQueue::ElementaryStreamQueue(Mode mode) |
| : mMode(mode) { |
| } |
| |
| sp<MetaData> ElementaryStreamQueue::getFormat() { |
| return mFormat; |
| } |
| |
| void ElementaryStreamQueue::clear(bool clearFormat) { |
| if (mBuffer != NULL) { |
| mBuffer->setRange(0, 0); |
| } |
| |
| mRangeInfos.clear(); |
| |
| if (clearFormat) { |
| mFormat.clear(); |
| } |
| } |
| |
| static bool IsSeeminglyValidADTSHeader(const uint8_t *ptr, size_t size) { |
| if (size < 3) { |
| // 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; |
| } |
| |
| return true; |
| } |
| |
| status_t ElementaryStreamQueue::appendData( |
| const void *data, size_t size, int64_t timeUs) { |
| if (mBuffer == NULL || mBuffer->size() == 0) { |
| switch (mMode) { |
| case H264: |
| { |
| #if 0 |
| if (size < 4 || memcmp("\x00\x00\x00\x01", data, 4)) { |
| return ERROR_MALFORMED; |
| } |
| #else |
| uint8_t *ptr = (uint8_t *)data; |
| |
| ssize_t startOffset = -1; |
| for (size_t i = 0; i + 3 < size; ++i) { |
| if (!memcmp("\x00\x00\x00\x01", &ptr[i], 4)) { |
| startOffset = i; |
| break; |
| } |
| } |
| |
| if (startOffset < 0) { |
| return ERROR_MALFORMED; |
| } |
| |
| if (startOffset > 0) { |
| LOGI("found something resembling an H.264 syncword at " |
| "offset %ld", |
| startOffset); |
| } |
| |
| data = &ptr[startOffset]; |
| size -= startOffset; |
| #endif |
| break; |
| } |
| |
| case AAC: |
| { |
| uint8_t *ptr = (uint8_t *)data; |
| |
| #if 0 |
| if (size < 2 || ptr[0] != 0xff || (ptr[1] >> 4) != 0x0f) { |
| return ERROR_MALFORMED; |
| } |
| #else |
| ssize_t startOffset = -1; |
| for (size_t i = 0; i < size; ++i) { |
| if (IsSeeminglyValidADTSHeader(&ptr[i], size - i)) { |
| startOffset = i; |
| break; |
| } |
| } |
| |
| if (startOffset < 0) { |
| return ERROR_MALFORMED; |
| } |
| |
| if (startOffset > 0) { |
| LOGI("found something resembling an AAC syncword at offset %ld", |
| startOffset); |
| } |
| |
| data = &ptr[startOffset]; |
| size -= startOffset; |
| #endif |
| break; |
| } |
| |
| default: |
| TRESPASS(); |
| break; |
| } |
| } |
| |
| size_t neededSize = (mBuffer == NULL ? 0 : mBuffer->size()) + size; |
| if (mBuffer == NULL || neededSize > mBuffer->capacity()) { |
| neededSize = (neededSize + 65535) & ~65535; |
| |
| LOGV("resizing buffer to size %d", neededSize); |
| |
| sp<ABuffer> buffer = new ABuffer(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.mTimestampUs = timeUs; |
| mRangeInfos.push_back(info); |
| |
| #if 0 |
| if (mMode == AAC) { |
| LOGI("size = %d, timeUs = %.2f secs", size, timeUs / 1E6); |
| hexdump(data, size); |
| } |
| #endif |
| |
| return OK; |
| } |
| |
| sp<ABuffer> ElementaryStreamQueue::dequeueAccessUnit() { |
| if (mMode == H264) { |
| return dequeueAccessUnitH264(); |
| } else { |
| CHECK_EQ((unsigned)mMode, (unsigned)AAC); |
| return dequeueAccessUnitAAC(); |
| } |
| } |
| |
| sp<ABuffer> ElementaryStreamQueue::dequeueAccessUnitAAC() { |
| Vector<size_t> ranges; |
| Vector<size_t> frameOffsets; |
| Vector<size_t> frameSizes; |
| size_t auSize = 0; |
| |
| size_t offset = 0; |
| while (offset + 7 <= mBuffer->size()) { |
| ABitReader bits(mBuffer->data() + offset, mBuffer->size() - offset); |
| |
| // adts_fixed_header |
| |
| CHECK_EQ(bits.getBits(12), 0xfffu); |
| bits.skipBits(3); // ID, layer |
| bool protection_absent = bits.getBits(1) != 0; |
| |
| if (mFormat == NULL) { |
| unsigned profile = bits.getBits(2); |
| CHECK_NE(profile, 3u); |
| unsigned sampling_freq_index = bits.getBits(4); |
| bits.getBits(1); // private_bit |
| unsigned channel_configuration = bits.getBits(3); |
| CHECK_NE(channel_configuration, 0u); |
| bits.skipBits(2); // original_copy, home |
| |
| mFormat = MakeAACCodecSpecificData( |
| profile, sampling_freq_index, channel_configuration); |
| |
| int32_t sampleRate; |
| int32_t numChannels; |
| CHECK(mFormat->findInt32(kKeySampleRate, &sampleRate)); |
| CHECK(mFormat->findInt32(kKeyChannelCount, &numChannels)); |
| |
| LOGI("found AAC codec config (%d Hz, %d channels)", |
| sampleRate, numChannels); |
| } else { |
| // profile_ObjectType, sampling_frequency_index, private_bits, |
| // channel_configuration, original_copy, home |
| bits.skipBits(12); |
| } |
| |
| // adts_variable_header |
| |
| // copyright_identification_bit, copyright_identification_start |
| bits.skipBits(2); |
| |
| unsigned aac_frame_length = bits.getBits(13); |
| |
| 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) { |
| // To be implemented. |
| TRESPASS(); |
| } |
| |
| if (offset + aac_frame_length > mBuffer->size()) { |
| break; |
| } |
| |
| size_t headerSize = protection_absent ? 7 : 9; |
| |
| ranges.push(aac_frame_length); |
| frameOffsets.push(offset + headerSize); |
| frameSizes.push(aac_frame_length - headerSize); |
| auSize += aac_frame_length - headerSize; |
| |
| offset += aac_frame_length; |
| } |
| |
| if (offset == 0) { |
| return NULL; |
| } |
| |
| int64_t timeUs = -1; |
| |
| for (size_t i = 0; i < ranges.size(); ++i) { |
| int64_t tmpUs = fetchTimestamp(ranges.itemAt(i)); |
| |
| if (i == 0) { |
| timeUs = tmpUs; |
| } |
| } |
| |
| sp<ABuffer> accessUnit = new ABuffer(auSize); |
| size_t dstOffset = 0; |
| for (size_t i = 0; i < frameOffsets.size(); ++i) { |
| size_t frameOffset = frameOffsets.itemAt(i); |
| |
| memcpy(accessUnit->data() + dstOffset, |
| mBuffer->data() + frameOffset, |
| frameSizes.itemAt(i)); |
| |
| dstOffset += frameSizes.itemAt(i); |
| } |
| |
| memmove(mBuffer->data(), mBuffer->data() + offset, |
| mBuffer->size() - offset); |
| mBuffer->setRange(0, mBuffer->size() - offset); |
| |
| if (timeUs >= 0) { |
| accessUnit->meta()->setInt64("timeUs", timeUs); |
| } else { |
| LOGW("no time for AAC access unit"); |
| } |
| |
| return accessUnit; |
| } |
| |
| int64_t ElementaryStreamQueue::fetchTimestamp(size_t size) { |
| int64_t timeUs = -1; |
| bool first = true; |
| |
| while (size > 0) { |
| CHECK(!mRangeInfos.empty()); |
| |
| RangeInfo *info = &*mRangeInfos.begin(); |
| |
| if (first) { |
| timeUs = info->mTimestampUs; |
| first = false; |
| } |
| |
| if (info->mLength > size) { |
| info->mLength -= size; |
| |
| if (first) { |
| info->mTimestampUs = -1; |
| } |
| |
| size = 0; |
| } else { |
| size -= info->mLength; |
| |
| mRangeInfos.erase(mRangeInfos.begin()); |
| info = NULL; |
| } |
| } |
| |
| return timeUs; |
| } |
| |
| struct NALPosition { |
| size_t nalOffset; |
| size_t nalSize; |
| }; |
| |
| sp<ABuffer> ElementaryStreamQueue::dequeueAccessUnitH264() { |
| const uint8_t *data = mBuffer->data(); |
| size_t size = mBuffer->size(); |
| |
| Vector<NALPosition> nals; |
| |
| size_t totalSize = 0; |
| |
| status_t err; |
| const uint8_t *nalStart; |
| size_t nalSize; |
| bool foundSlice = false; |
| while ((err = getNextNALUnit(&data, &size, &nalStart, &nalSize)) == OK) { |
| CHECK_GT(nalSize, 0u); |
| |
| unsigned nalType = nalStart[0] & 0x1f; |
| bool flush = false; |
| |
| if (nalType == 1 || nalType == 5) { |
| if (foundSlice) { |
| ABitReader br(nalStart + 1, nalSize); |
| unsigned first_mb_in_slice = parseUE(&br); |
| |
| if (first_mb_in_slice == 0) { |
| // This slice starts a new frame. |
| |
| flush = true; |
| } |
| } |
| |
| foundSlice = true; |
| } else if ((nalType == 9 || nalType == 7) && foundSlice) { |
| // Access unit delimiter and SPS will be associated with the |
| // next frame. |
| |
| flush = true; |
| } |
| |
| if (flush) { |
| // The access unit will contain all nal units up to, but excluding |
| // the current one, separated by 0x00 0x00 0x00 0x01 startcodes. |
| |
| size_t auSize = 4 * nals.size() + totalSize; |
| sp<ABuffer> accessUnit = new ABuffer(auSize); |
| |
| #if !LOG_NDEBUG |
| AString out; |
| #endif |
| |
| size_t dstOffset = 0; |
| for (size_t i = 0; i < nals.size(); ++i) { |
| const NALPosition &pos = nals.itemAt(i); |
| |
| unsigned nalType = mBuffer->data()[pos.nalOffset] & 0x1f; |
| |
| #if !LOG_NDEBUG |
| char tmp[128]; |
| sprintf(tmp, "0x%02x", nalType); |
| if (i > 0) { |
| out.append(", "); |
| } |
| out.append(tmp); |
| #endif |
| |
| memcpy(accessUnit->data() + dstOffset, "\x00\x00\x00\x01", 4); |
| |
| memcpy(accessUnit->data() + dstOffset + 4, |
| mBuffer->data() + pos.nalOffset, |
| pos.nalSize); |
| |
| dstOffset += pos.nalSize + 4; |
| } |
| |
| LOGV("accessUnit contains nal types %s", out.c_str()); |
| |
| const NALPosition &pos = nals.itemAt(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 timeUs = fetchTimestamp(nextScan); |
| CHECK_GE(timeUs, 0ll); |
| |
| accessUnit->meta()->setInt64("timeUs", timeUs); |
| |
| if (mFormat == NULL) { |
| mFormat = MakeAVCCodecSpecificData(accessUnit); |
| } |
| |
| return accessUnit; |
| } |
| |
| NALPosition pos; |
| pos.nalOffset = nalStart - mBuffer->data(); |
| pos.nalSize = nalSize; |
| |
| nals.push(pos); |
| |
| totalSize += nalSize; |
| } |
| CHECK_EQ(err, (status_t)-EAGAIN); |
| |
| return NULL; |
| } |
| |
| } // namespace android |