| /* |
| * 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_TAG "MPEG4Extractor" |
| #include <utils/Log.h> |
| |
| #include "include/SampleTable.h" |
| |
| #include <arpa/inet.h> |
| |
| #include <ctype.h> |
| #include <stdint.h> |
| #include <stdlib.h> |
| #include <string.h> |
| |
| #include <media/stagefright/DataSource.h> |
| #include <media/stagefright/MPEG4Extractor.h> |
| #include <media/stagefright/MediaBuffer.h> |
| #include <media/stagefright/MediaBufferGroup.h> |
| #include <media/stagefright/MediaDebug.h> |
| #include <media/stagefright/MediaDefs.h> |
| #include <media/stagefright/MediaSource.h> |
| #include <media/stagefright/MetaData.h> |
| #include <media/stagefright/Utils.h> |
| #include <utils/String8.h> |
| |
| namespace android { |
| |
| class MPEG4Source : public MediaSource { |
| public: |
| // Caller retains ownership of both "dataSource" and "sampleTable". |
| MPEG4Source(const sp<MetaData> &format, |
| const sp<DataSource> &dataSource, |
| int32_t timeScale, |
| const sp<SampleTable> &sampleTable); |
| |
| virtual status_t start(MetaData *params = NULL); |
| virtual status_t stop(); |
| |
| virtual sp<MetaData> getFormat(); |
| |
| virtual status_t read( |
| MediaBuffer **buffer, const ReadOptions *options = NULL); |
| |
| protected: |
| virtual ~MPEG4Source(); |
| |
| private: |
| sp<MetaData> mFormat; |
| sp<DataSource> mDataSource; |
| int32_t mTimescale; |
| sp<SampleTable> mSampleTable; |
| uint32_t mCurrentSampleIndex; |
| |
| bool mIsAVC; |
| bool mStarted; |
| |
| MediaBufferGroup *mGroup; |
| |
| MediaBuffer *mBuffer; |
| |
| bool mWantsNALFragments; |
| |
| uint8_t *mSrcBuffer; |
| |
| MPEG4Source(const MPEG4Source &); |
| MPEG4Source &operator=(const MPEG4Source &); |
| }; |
| |
| static void hexdump(const void *_data, size_t size) { |
| const uint8_t *data = (const uint8_t *)_data; |
| size_t offset = 0; |
| while (offset < size) { |
| printf("0x%04x ", offset); |
| |
| size_t n = size - offset; |
| if (n > 16) { |
| n = 16; |
| } |
| |
| for (size_t i = 0; i < 16; ++i) { |
| if (i == 8) { |
| printf(" "); |
| } |
| |
| if (offset + i < size) { |
| printf("%02x ", data[offset + i]); |
| } else { |
| printf(" "); |
| } |
| } |
| |
| printf(" "); |
| |
| for (size_t i = 0; i < n; ++i) { |
| if (isprint(data[offset + i])) { |
| printf("%c", data[offset + i]); |
| } else { |
| printf("."); |
| } |
| } |
| |
| printf("\n"); |
| |
| offset += 16; |
| } |
| } |
| |
| static const char *FourCC2MIME(uint32_t fourcc) { |
| switch (fourcc) { |
| case FOURCC('m', 'p', '4', 'a'): |
| return MEDIA_MIMETYPE_AUDIO_AAC; |
| |
| case FOURCC('s', 'a', 'm', 'r'): |
| return MEDIA_MIMETYPE_AUDIO_AMR_NB; |
| |
| case FOURCC('s', 'a', 'w', 'b'): |
| return MEDIA_MIMETYPE_AUDIO_AMR_WB; |
| |
| case FOURCC('m', 'p', '4', 'v'): |
| return MEDIA_MIMETYPE_VIDEO_MPEG4; |
| |
| case FOURCC('s', '2', '6', '3'): |
| return MEDIA_MIMETYPE_VIDEO_H263; |
| |
| case FOURCC('a', 'v', 'c', '1'): |
| return MEDIA_MIMETYPE_VIDEO_AVC; |
| |
| default: |
| CHECK(!"should not be here."); |
| return NULL; |
| } |
| } |
| |
| MPEG4Extractor::MPEG4Extractor(const sp<DataSource> &source) |
| : mDataSource(source), |
| mHaveMetadata(false), |
| mFirstTrack(NULL), |
| mLastTrack(NULL) { |
| } |
| |
| MPEG4Extractor::~MPEG4Extractor() { |
| Track *track = mFirstTrack; |
| while (track) { |
| Track *next = track->next; |
| |
| delete track; |
| track = next; |
| } |
| mFirstTrack = mLastTrack = NULL; |
| } |
| |
| size_t MPEG4Extractor::countTracks() { |
| status_t err; |
| if ((err = readMetaData()) != OK) { |
| return 0; |
| } |
| |
| size_t n = 0; |
| Track *track = mFirstTrack; |
| while (track) { |
| ++n; |
| track = track->next; |
| } |
| |
| return n; |
| } |
| |
| sp<MetaData> MPEG4Extractor::getTrackMetaData( |
| size_t index, uint32_t flags) { |
| status_t err; |
| if ((err = readMetaData()) != OK) { |
| return NULL; |
| } |
| |
| Track *track = mFirstTrack; |
| while (index > 0) { |
| if (track == NULL) { |
| return NULL; |
| } |
| |
| track = track->next; |
| --index; |
| } |
| |
| if (track == NULL) { |
| return NULL; |
| } |
| |
| if ((flags & kIncludeExtensiveMetaData) |
| && !track->includes_expensive_metadata) { |
| track->includes_expensive_metadata = true; |
| |
| const char *mime; |
| CHECK(track->meta->findCString(kKeyMIMEType, &mime)); |
| if (!strncasecmp("video/", mime, 6)) { |
| uint32_t sampleIndex; |
| uint32_t sampleTime; |
| if (track->sampleTable->findThumbnailSample(&sampleIndex) == OK |
| && track->sampleTable->getDecodingTime( |
| sampleIndex, &sampleTime) == OK) { |
| track->meta->setInt64( |
| kKeyThumbnailTime, |
| ((int64_t)sampleTime * 1000000) / track->timescale); |
| } |
| } |
| } |
| |
| return track->meta; |
| } |
| |
| status_t MPEG4Extractor::readMetaData() { |
| if (mHaveMetadata) { |
| return OK; |
| } |
| |
| off_t offset = 0; |
| status_t err; |
| while ((err = parseChunk(&offset, 0)) == OK) { |
| } |
| |
| if (mHaveMetadata) { |
| return OK; |
| } |
| |
| return err; |
| } |
| |
| static void MakeFourCCString(uint32_t x, char *s) { |
| s[0] = x >> 24; |
| s[1] = (x >> 16) & 0xff; |
| s[2] = (x >> 8) & 0xff; |
| s[3] = x & 0xff; |
| s[4] = '\0'; |
| } |
| |
| status_t MPEG4Extractor::parseChunk(off_t *offset, int depth) { |
| uint32_t hdr[2]; |
| if (mDataSource->read_at(*offset, hdr, 8) < 8) { |
| return ERROR_IO; |
| } |
| uint64_t chunk_size = ntohl(hdr[0]); |
| uint32_t chunk_type = ntohl(hdr[1]); |
| off_t data_offset = *offset + 8; |
| |
| if (chunk_size == 1) { |
| if (mDataSource->read_at(*offset + 8, &chunk_size, 8) < 8) { |
| return ERROR_IO; |
| } |
| chunk_size = ntoh64(chunk_size); |
| data_offset += 8; |
| } |
| |
| char chunk[5]; |
| MakeFourCCString(chunk_type, chunk); |
| |
| #if 0 |
| static const char kWhitespace[] = " "; |
| const char *indent = &kWhitespace[sizeof(kWhitespace) - 1 - 2 * depth]; |
| printf("%sfound chunk '%s' of size %lld\n", indent, chunk, chunk_size); |
| |
| char buffer[256]; |
| if (chunk_size <= sizeof(buffer)) { |
| if (mDataSource->read_at(*offset, buffer, chunk_size) < chunk_size) { |
| return ERROR_IO; |
| } |
| |
| hexdump(buffer, chunk_size); |
| } |
| #endif |
| |
| off_t chunk_data_size = *offset + chunk_size - data_offset; |
| |
| switch(chunk_type) { |
| case FOURCC('m', 'o', 'o', 'v'): |
| case FOURCC('t', 'r', 'a', 'k'): |
| case FOURCC('m', 'd', 'i', 'a'): |
| case FOURCC('m', 'i', 'n', 'f'): |
| case FOURCC('d', 'i', 'n', 'f'): |
| case FOURCC('s', 't', 'b', 'l'): |
| case FOURCC('m', 'v', 'e', 'x'): |
| case FOURCC('m', 'o', 'o', 'f'): |
| case FOURCC('t', 'r', 'a', 'f'): |
| case FOURCC('m', 'f', 'r', 'a'): |
| case FOURCC('s', 'k', 'i' ,'p'): |
| { |
| off_t stop_offset = *offset + chunk_size; |
| *offset = data_offset; |
| while (*offset < stop_offset) { |
| status_t err = parseChunk(offset, depth + 1); |
| if (err != OK) { |
| return err; |
| } |
| } |
| CHECK_EQ(*offset, stop_offset); |
| |
| if (chunk_type == FOURCC('m', 'o', 'o', 'v')) { |
| mHaveMetadata = true; |
| |
| return UNKNOWN_ERROR; // Return a dummy error. |
| } |
| break; |
| } |
| |
| case FOURCC('t', 'k', 'h', 'd'): |
| { |
| CHECK(chunk_data_size >= 4); |
| |
| uint8_t version; |
| if (mDataSource->read_at(data_offset, &version, 1) < 1) { |
| return ERROR_IO; |
| } |
| |
| uint64_t ctime, mtime, duration; |
| int32_t id; |
| uint32_t width, height; |
| |
| if (version == 1) { |
| if (chunk_data_size != 36 + 60) { |
| return ERROR_MALFORMED; |
| } |
| |
| uint8_t buffer[36 + 60]; |
| if (mDataSource->read_at( |
| data_offset, buffer, sizeof(buffer)) < (ssize_t)sizeof(buffer)) { |
| return ERROR_IO; |
| } |
| |
| ctime = U64_AT(&buffer[4]); |
| mtime = U64_AT(&buffer[12]); |
| id = U32_AT(&buffer[20]); |
| duration = U64_AT(&buffer[28]); |
| width = U32_AT(&buffer[88]); |
| height = U32_AT(&buffer[92]); |
| } else if (version == 0) { |
| if (chunk_data_size != 24 + 60) { |
| return ERROR_MALFORMED; |
| } |
| |
| uint8_t buffer[24 + 60]; |
| if (mDataSource->read_at( |
| data_offset, buffer, sizeof(buffer)) < (ssize_t)sizeof(buffer)) { |
| return ERROR_IO; |
| } |
| ctime = U32_AT(&buffer[4]); |
| mtime = U32_AT(&buffer[8]); |
| id = U32_AT(&buffer[12]); |
| duration = U32_AT(&buffer[20]); |
| width = U32_AT(&buffer[76]); |
| height = U32_AT(&buffer[80]); |
| } |
| |
| Track *track = new Track; |
| track->next = NULL; |
| if (mLastTrack) { |
| mLastTrack->next = track; |
| } else { |
| mFirstTrack = track; |
| } |
| mLastTrack = track; |
| |
| track->meta = new MetaData; |
| track->includes_expensive_metadata = false; |
| track->timescale = 0; |
| track->sampleTable = new SampleTable(mDataSource); |
| track->meta->setCString(kKeyMIMEType, "application/octet-stream"); |
| |
| *offset += chunk_size; |
| break; |
| } |
| |
| case FOURCC('m', 'd', 'h', 'd'): |
| { |
| if (chunk_data_size < 4) { |
| return ERROR_MALFORMED; |
| } |
| |
| uint8_t version; |
| if (mDataSource->read_at( |
| data_offset, &version, sizeof(version)) |
| < (ssize_t)sizeof(version)) { |
| return ERROR_IO; |
| } |
| |
| off_t timescale_offset; |
| |
| if (version == 1) { |
| timescale_offset = data_offset + 4 + 16; |
| } else if (version == 0) { |
| timescale_offset = data_offset + 4 + 8; |
| } else { |
| return ERROR_IO; |
| } |
| |
| uint32_t timescale; |
| if (mDataSource->read_at( |
| timescale_offset, ×cale, sizeof(timescale)) |
| < (ssize_t)sizeof(timescale)) { |
| return ERROR_IO; |
| } |
| |
| mLastTrack->timescale = ntohl(timescale); |
| |
| int64_t duration; |
| if (version == 1) { |
| if (mDataSource->read_at( |
| timescale_offset + 4, &duration, sizeof(duration)) |
| < (ssize_t)sizeof(duration)) { |
| return ERROR_IO; |
| } |
| duration = ntoh64(duration); |
| } else { |
| int32_t duration32; |
| if (mDataSource->read_at( |
| timescale_offset + 4, &duration32, sizeof(duration32)) |
| < (ssize_t)sizeof(duration32)) { |
| return ERROR_IO; |
| } |
| duration = ntohl(duration32); |
| } |
| mLastTrack->meta->setInt64( |
| kKeyDuration, (duration * 1000000) / mLastTrack->timescale); |
| |
| *offset += chunk_size; |
| break; |
| } |
| |
| case FOURCC('h', 'd', 'l', 'r'): |
| { |
| if (chunk_data_size < 25) { |
| return ERROR_MALFORMED; |
| } |
| |
| uint8_t buffer[24]; |
| if (mDataSource->read_at(data_offset, buffer, 24) < 24) { |
| return ERROR_IO; |
| } |
| |
| if (U32_AT(buffer) != 0) { |
| // Should be version 0, flags 0. |
| return ERROR_MALFORMED; |
| } |
| |
| if (U32_AT(&buffer[4]) != 0) { |
| // pre_defined should be 0. |
| return ERROR_MALFORMED; |
| } |
| |
| mHandlerType = U32_AT(&buffer[8]); |
| *offset += chunk_size; |
| break; |
| } |
| |
| case FOURCC('s', 't', 's', 'd'): |
| { |
| if (chunk_data_size < 8) { |
| return ERROR_MALFORMED; |
| } |
| |
| uint8_t buffer[8]; |
| CHECK(chunk_data_size >= (off_t)sizeof(buffer)); |
| if (mDataSource->read_at( |
| data_offset, buffer, 8) < 8) { |
| return ERROR_IO; |
| } |
| |
| if (U32_AT(buffer) != 0) { |
| // Should be version 0, flags 0. |
| return ERROR_MALFORMED; |
| } |
| |
| uint32_t entry_count = U32_AT(&buffer[4]); |
| |
| if (entry_count > 1) { |
| // For now we only support a single type of media per track. |
| return ERROR_UNSUPPORTED; |
| } |
| |
| off_t stop_offset = *offset + chunk_size; |
| *offset = data_offset + 8; |
| for (uint32_t i = 0; i < entry_count; ++i) { |
| status_t err = parseChunk(offset, depth + 1); |
| if (err != OK) { |
| return err; |
| } |
| } |
| CHECK_EQ(*offset, stop_offset); |
| break; |
| } |
| |
| case FOURCC('m', 'p', '4', 'a'): |
| case FOURCC('s', 'a', 'm', 'r'): |
| case FOURCC('s', 'a', 'w', 'b'): |
| { |
| if (mHandlerType != FOURCC('s', 'o', 'u', 'n')) { |
| return ERROR_MALFORMED; |
| } |
| |
| uint8_t buffer[8 + 20]; |
| if (chunk_data_size < (ssize_t)sizeof(buffer)) { |
| // Basic AudioSampleEntry size. |
| return ERROR_MALFORMED; |
| } |
| |
| if (mDataSource->read_at( |
| data_offset, buffer, sizeof(buffer)) < (ssize_t)sizeof(buffer)) { |
| return ERROR_IO; |
| } |
| |
| uint16_t data_ref_index = U16_AT(&buffer[6]); |
| uint16_t num_channels = U16_AT(&buffer[16]); |
| |
| if (!strcasecmp(MEDIA_MIMETYPE_AUDIO_AMR_NB, |
| FourCC2MIME(chunk_type)) |
| || !strcasecmp(MEDIA_MIMETYPE_AUDIO_AMR_WB, |
| FourCC2MIME(chunk_type))) { |
| // AMR audio is always mono. |
| num_channels = 1; |
| } |
| |
| uint16_t sample_size = U16_AT(&buffer[18]); |
| uint32_t sample_rate = U32_AT(&buffer[24]) >> 16; |
| |
| printf("*** coding='%s' %d channels, size %d, rate %d\n", |
| chunk, num_channels, sample_size, sample_rate); |
| |
| mLastTrack->meta->setCString(kKeyMIMEType, FourCC2MIME(chunk_type)); |
| mLastTrack->meta->setInt32(kKeyChannelCount, num_channels); |
| mLastTrack->meta->setInt32(kKeySampleRate, sample_rate); |
| |
| off_t stop_offset = *offset + chunk_size; |
| *offset = data_offset + sizeof(buffer); |
| while (*offset < stop_offset) { |
| status_t err = parseChunk(offset, depth + 1); |
| if (err != OK) { |
| return err; |
| } |
| } |
| CHECK_EQ(*offset, stop_offset); |
| break; |
| } |
| |
| case FOURCC('m', 'p', '4', 'v'): |
| case FOURCC('s', '2', '6', '3'): |
| case FOURCC('a', 'v', 'c', '1'): |
| { |
| if (mHandlerType != FOURCC('v', 'i', 'd', 'e')) { |
| return ERROR_MALFORMED; |
| } |
| |
| uint8_t buffer[78]; |
| if (chunk_data_size < (ssize_t)sizeof(buffer)) { |
| // Basic VideoSampleEntry size. |
| return ERROR_MALFORMED; |
| } |
| |
| if (mDataSource->read_at( |
| data_offset, buffer, sizeof(buffer)) < (ssize_t)sizeof(buffer)) { |
| return ERROR_IO; |
| } |
| |
| uint16_t data_ref_index = U16_AT(&buffer[6]); |
| uint16_t width = U16_AT(&buffer[6 + 18]); |
| uint16_t height = U16_AT(&buffer[6 + 20]); |
| |
| printf("*** coding='%s' width=%d height=%d\n", |
| chunk, width, height); |
| |
| mLastTrack->meta->setCString(kKeyMIMEType, FourCC2MIME(chunk_type)); |
| mLastTrack->meta->setInt32(kKeyWidth, width); |
| mLastTrack->meta->setInt32(kKeyHeight, height); |
| |
| off_t stop_offset = *offset + chunk_size; |
| *offset = data_offset + sizeof(buffer); |
| while (*offset < stop_offset) { |
| status_t err = parseChunk(offset, depth + 1); |
| if (err != OK) { |
| return err; |
| } |
| } |
| CHECK_EQ(*offset, stop_offset); |
| break; |
| } |
| |
| case FOURCC('s', 't', 'c', 'o'): |
| case FOURCC('c', 'o', '6', '4'): |
| { |
| status_t err = |
| mLastTrack->sampleTable->setChunkOffsetParams( |
| chunk_type, data_offset, chunk_data_size); |
| |
| if (err != OK) { |
| return err; |
| } |
| |
| *offset += chunk_size; |
| break; |
| } |
| |
| case FOURCC('s', 't', 's', 'c'): |
| { |
| status_t err = |
| mLastTrack->sampleTable->setSampleToChunkParams( |
| data_offset, chunk_data_size); |
| |
| if (err != OK) { |
| return err; |
| } |
| |
| *offset += chunk_size; |
| break; |
| } |
| |
| case FOURCC('s', 't', 's', 'z'): |
| case FOURCC('s', 't', 'z', '2'): |
| { |
| status_t err = |
| mLastTrack->sampleTable->setSampleSizeParams( |
| chunk_type, data_offset, chunk_data_size); |
| |
| if (err != OK) { |
| return err; |
| } |
| |
| *offset += chunk_size; |
| break; |
| } |
| |
| case FOURCC('s', 't', 't', 's'): |
| { |
| status_t err = |
| mLastTrack->sampleTable->setTimeToSampleParams( |
| data_offset, chunk_data_size); |
| |
| if (err != OK) { |
| return err; |
| } |
| |
| *offset += chunk_size; |
| break; |
| } |
| |
| case FOURCC('s', 't', 's', 's'): |
| { |
| status_t err = |
| mLastTrack->sampleTable->setSyncSampleParams( |
| data_offset, chunk_data_size); |
| |
| if (err != OK) { |
| return err; |
| } |
| |
| *offset += chunk_size; |
| break; |
| } |
| |
| case FOURCC('e', 's', 'd', 's'): |
| { |
| if (chunk_data_size < 4) { |
| return ERROR_MALFORMED; |
| } |
| |
| uint8_t buffer[256]; |
| if (chunk_data_size > (off_t)sizeof(buffer)) { |
| return ERROR_BUFFER_TOO_SMALL; |
| } |
| |
| if (mDataSource->read_at( |
| data_offset, buffer, chunk_data_size) < chunk_data_size) { |
| return ERROR_IO; |
| } |
| |
| if (U32_AT(buffer) != 0) { |
| // Should be version 0, flags 0. |
| return ERROR_MALFORMED; |
| } |
| |
| mLastTrack->meta->setData( |
| kKeyESDS, kTypeESDS, &buffer[4], chunk_data_size - 4); |
| |
| *offset += chunk_size; |
| break; |
| } |
| |
| case FOURCC('a', 'v', 'c', 'C'): |
| { |
| char buffer[256]; |
| if (chunk_data_size > (off_t)sizeof(buffer)) { |
| return ERROR_BUFFER_TOO_SMALL; |
| } |
| |
| if (mDataSource->read_at( |
| data_offset, buffer, chunk_data_size) < chunk_data_size) { |
| return ERROR_IO; |
| } |
| |
| mLastTrack->meta->setData( |
| kKeyAVCC, kTypeAVCC, buffer, chunk_data_size); |
| |
| *offset += chunk_size; |
| break; |
| } |
| |
| default: |
| { |
| *offset += chunk_size; |
| break; |
| } |
| } |
| |
| return OK; |
| } |
| |
| sp<MediaSource> MPEG4Extractor::getTrack(size_t index) { |
| status_t err; |
| if ((err = readMetaData()) != OK) { |
| return NULL; |
| } |
| |
| Track *track = mFirstTrack; |
| while (index > 0) { |
| if (track == NULL) { |
| return NULL; |
| } |
| |
| track = track->next; |
| --index; |
| } |
| |
| if (track == NULL) { |
| return NULL; |
| } |
| |
| return new MPEG4Source( |
| track->meta, mDataSource, track->timescale, track->sampleTable); |
| } |
| |
| //////////////////////////////////////////////////////////////////////////////// |
| |
| MPEG4Source::MPEG4Source( |
| const sp<MetaData> &format, |
| const sp<DataSource> &dataSource, |
| int32_t timeScale, |
| const sp<SampleTable> &sampleTable) |
| : mFormat(format), |
| mDataSource(dataSource), |
| mTimescale(timeScale), |
| mSampleTable(sampleTable), |
| mCurrentSampleIndex(0), |
| mIsAVC(false), |
| mStarted(false), |
| mGroup(NULL), |
| mBuffer(NULL), |
| mWantsNALFragments(false), |
| mSrcBuffer(NULL) { |
| const char *mime; |
| bool success = mFormat->findCString(kKeyMIMEType, &mime); |
| CHECK(success); |
| |
| mIsAVC = !strcasecmp(mime, MEDIA_MIMETYPE_VIDEO_AVC); |
| } |
| |
| MPEG4Source::~MPEG4Source() { |
| if (mStarted) { |
| stop(); |
| } |
| } |
| |
| status_t MPEG4Source::start(MetaData *params) { |
| CHECK(!mStarted); |
| |
| int32_t val; |
| if (params && params->findInt32(kKeyWantsNALFragments, &val) |
| && val != 0) { |
| mWantsNALFragments = true; |
| } else { |
| mWantsNALFragments = false; |
| } |
| |
| mGroup = new MediaBufferGroup; |
| |
| size_t max_size; |
| status_t err = mSampleTable->getMaxSampleSize(&max_size); |
| CHECK_EQ(err, OK); |
| |
| // Assume that a given buffer only contains at most 10 fragments, |
| // each fragment originally prefixed with a 2 byte length will |
| // have a 4 byte header (0x00 0x00 0x00 0x01) after conversion, |
| // and thus will grow by 2 bytes per fragment. |
| mGroup->add_buffer(new MediaBuffer(max_size + 10 * 2)); |
| |
| mSrcBuffer = new uint8_t[max_size]; |
| |
| mStarted = true; |
| |
| return OK; |
| } |
| |
| status_t MPEG4Source::stop() { |
| CHECK(mStarted); |
| |
| if (mBuffer != NULL) { |
| mBuffer->release(); |
| mBuffer = NULL; |
| } |
| |
| delete[] mSrcBuffer; |
| mSrcBuffer = NULL; |
| |
| delete mGroup; |
| mGroup = NULL; |
| |
| mStarted = false; |
| mCurrentSampleIndex = 0; |
| |
| return OK; |
| } |
| |
| sp<MetaData> MPEG4Source::getFormat() { |
| return mFormat; |
| } |
| |
| status_t MPEG4Source::read( |
| MediaBuffer **out, const ReadOptions *options) { |
| CHECK(mStarted); |
| |
| *out = NULL; |
| |
| int64_t seekTimeUs; |
| if (options && options->getSeekTo(&seekTimeUs)) { |
| uint32_t sampleIndex; |
| status_t err = mSampleTable->findClosestSample( |
| seekTimeUs * mTimescale / 1000000, |
| &sampleIndex, SampleTable::kSyncSample_Flag); |
| |
| if (err != OK) { |
| return err; |
| } |
| |
| mCurrentSampleIndex = sampleIndex; |
| if (mBuffer != NULL) { |
| mBuffer->release(); |
| mBuffer = NULL; |
| } |
| |
| // fall through |
| } |
| |
| off_t offset; |
| size_t size; |
| uint32_t dts; |
| bool newBuffer = false; |
| if (mBuffer == NULL) { |
| newBuffer = true; |
| |
| status_t err = mSampleTable->getSampleOffsetAndSize( |
| mCurrentSampleIndex, &offset, &size); |
| |
| if (err != OK) { |
| return err; |
| } |
| |
| err = mSampleTable->getDecodingTime(mCurrentSampleIndex, &dts); |
| |
| if (err != OK) { |
| return err; |
| } |
| |
| err = mGroup->acquire_buffer(&mBuffer); |
| if (err != OK) { |
| CHECK_EQ(mBuffer, NULL); |
| return err; |
| } |
| } |
| |
| if (!mIsAVC || mWantsNALFragments) { |
| if (newBuffer) { |
| ssize_t num_bytes_read = |
| mDataSource->read_at(offset, (uint8_t *)mBuffer->data(), size); |
| |
| if (num_bytes_read < (ssize_t)size) { |
| mBuffer->release(); |
| mBuffer = NULL; |
| |
| return ERROR_IO; |
| } |
| |
| mBuffer->set_range(0, size); |
| mBuffer->meta_data()->clear(); |
| mBuffer->meta_data()->setInt64( |
| kKeyTime, ((int64_t)dts * 1000000) / mTimescale); |
| ++mCurrentSampleIndex; |
| } |
| |
| if (!mIsAVC) { |
| *out = mBuffer; |
| mBuffer = NULL; |
| |
| return OK; |
| } |
| |
| // Each NAL unit is split up into its constituent fragments and |
| // each one of them returned in its own buffer. |
| |
| CHECK(mBuffer->range_length() >= 2); |
| |
| const uint8_t *src = |
| (const uint8_t *)mBuffer->data() + mBuffer->range_offset(); |
| |
| size_t nal_size = U16_AT(src); |
| |
| CHECK(mBuffer->range_length() >= 2 + nal_size); |
| |
| MediaBuffer *clone = mBuffer->clone(); |
| clone->set_range(mBuffer->range_offset() + 2, nal_size); |
| |
| mBuffer->set_range( |
| mBuffer->range_offset() + 2 + nal_size, |
| mBuffer->range_length() - 2 - nal_size); |
| |
| if (mBuffer->range_length() == 0) { |
| mBuffer->release(); |
| mBuffer = NULL; |
| } |
| |
| *out = clone; |
| |
| return OK; |
| } else { |
| // Whole NAL units are returned but each fragment is prefixed by |
| // the start code (0x00 00 00 01). |
| |
| ssize_t num_bytes_read = |
| mDataSource->read_at(offset, mSrcBuffer, size); |
| |
| if (num_bytes_read < (ssize_t)size) { |
| mBuffer->release(); |
| mBuffer = NULL; |
| |
| return ERROR_IO; |
| } |
| |
| uint8_t *dstData = (uint8_t *)mBuffer->data(); |
| size_t srcOffset = 0; |
| size_t dstOffset = 0; |
| while (srcOffset < size) { |
| CHECK(srcOffset + 1 < size); |
| size_t nalLength = |
| (mSrcBuffer[srcOffset] << 8) | mSrcBuffer[srcOffset + 1]; |
| CHECK(srcOffset + 1 + nalLength < size); |
| srcOffset += 2; |
| |
| if (nalLength == 0) { |
| continue; |
| } |
| |
| CHECK(dstOffset + 4 <= mBuffer->size()); |
| |
| dstData[dstOffset++] = 0; |
| dstData[dstOffset++] = 0; |
| dstData[dstOffset++] = 0; |
| dstData[dstOffset++] = 1; |
| memcpy(&dstData[dstOffset], &mSrcBuffer[srcOffset], nalLength); |
| srcOffset += nalLength; |
| dstOffset += nalLength; |
| } |
| |
| mBuffer->set_range(0, dstOffset); |
| mBuffer->meta_data()->clear(); |
| mBuffer->meta_data()->setInt64( |
| kKeyTime, ((int64_t)dts * 1000000) / mTimescale); |
| ++mCurrentSampleIndex; |
| |
| *out = mBuffer; |
| mBuffer = NULL; |
| |
| return OK; |
| } |
| } |
| |
| bool SniffMPEG4( |
| const sp<DataSource> &source, String8 *mimeType, float *confidence) { |
| uint8_t header[8]; |
| |
| ssize_t n = source->read_at(4, header, sizeof(header)); |
| if (n < (ssize_t)sizeof(header)) { |
| return false; |
| } |
| |
| if (!memcmp(header, "ftyp3gp", 7) || !memcmp(header, "ftypmp42", 8) |
| || !memcmp(header, "ftypisom", 8) || !memcmp(header, "ftypM4V ", 8)) { |
| *mimeType = MEDIA_MIMETYPE_CONTAINER_MPEG4; |
| *confidence = 0.1; |
| |
| return true; |
| } |
| |
| return false; |
| } |
| |
| } // namespace android |
| |