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/*
* 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 "JPEGSource"
#include <utils/Log.h>
#include <media/stagefright/foundation/ADebug.h>
#include <media/stagefright/DataSource.h>
#include <media/stagefright/JPEGSource.h>
#include <media/stagefright/MediaBufferGroup.h>
#include <media/stagefright/MediaDefs.h>
#include <media/stagefright/MediaErrors.h>
#include <media/stagefright/MetaData.h>
#define JPEG_SOF0 0xC0 /* nStart Of Frame N*/
#define JPEG_SOF1 0xC1 /* N indicates which compression process*/
#define JPEG_SOF2 0xC2 /* Only SOF0-SOF2 are now in common use*/
#define JPEG_SOF3 0xC3
#define JPEG_SOF5 0xC5 /* NB: codes C4 and CC are NOT SOF markers*/
#define JPEG_SOF6 0xC6
#define JPEG_SOF7 0xC7
#define JPEG_SOF9 0xC9
#define JPEG_SOF10 0xCA
#define JPEG_SOF11 0xCB
#define JPEG_SOF13 0xCD
#define JPEG_SOF14 0xCE
#define JPEG_SOF15 0xCF
#define JPEG_SOI 0xD8 /* nStart Of Image (beginning of datastream)*/
#define JPEG_EOI 0xD9 /* End Of Image (end of datastream)*/
#define JPEG_SOS 0xDA /* nStart Of Scan (begins compressed data)*/
#define JPEG_JFIF 0xE0 /* Jfif marker*/
#define JPEG_EXIF 0xE1 /* Exif marker*/
#define JPEG_COM 0xFE /* COMment */
#define JPEG_DQT 0xDB
#define JPEG_DHT 0xC4
#define JPEG_DRI 0xDD
namespace android {
JPEGSource::JPEGSource(const sp<DataSource> &source)
: mSource(source),
mGroup(NULL),
mStarted(false),
mSize(0),
mWidth(0),
mHeight(0),
mOffset(0) {
CHECK_EQ(parseJPEG(), (status_t)OK);
CHECK(mSource->getSize(&mSize) == OK);
}
JPEGSource::~JPEGSource() {
if (mStarted) {
stop();
}
}
status_t JPEGSource::start(MetaData *) {
if (mStarted) {
return UNKNOWN_ERROR;
}
mGroup = new MediaBufferGroup;
mGroup->add_buffer(new MediaBuffer(mSize));
mOffset = 0;
mStarted = true;
return OK;
}
status_t JPEGSource::stop() {
if (!mStarted) {
return UNKNOWN_ERROR;
}
delete mGroup;
mGroup = NULL;
mStarted = false;
return OK;
}
sp<MetaData> JPEGSource::getFormat() {
sp<MetaData> meta = new MetaData;
meta->setCString(kKeyMIMEType, MEDIA_MIMETYPE_IMAGE_JPEG);
meta->setInt32(kKeyWidth, mWidth);
meta->setInt32(kKeyHeight, mHeight);
meta->setInt32(kKeyMaxInputSize, mSize);
return meta;
}
status_t JPEGSource::read(
MediaBuffer **out, const ReadOptions *options) {
*out = NULL;
int64_t seekTimeUs;
ReadOptions::SeekMode mode;
if (options != NULL && options->getSeekTo(&seekTimeUs, &mode)) {
return UNKNOWN_ERROR;
}
MediaBuffer *buffer;
mGroup->acquire_buffer(&buffer);
ssize_t n = mSource->readAt(mOffset, buffer->data(), mSize - mOffset);
if (n <= 0) {
buffer->release();
buffer = NULL;
return UNKNOWN_ERROR;
}
buffer->set_range(0, n);
mOffset += n;
*out = buffer;
return OK;
}
status_t JPEGSource::parseJPEG() {
mWidth = 0;
mHeight = 0;
off64_t i = 0;
uint16_t soi;
if (!mSource->getUInt16(i, &soi)) {
return ERROR_IO;
}
i += 2;
if (soi != 0xffd8) {
return UNKNOWN_ERROR;
}
for (;;) {
uint8_t marker;
if (mSource->readAt(i++, &marker, 1) != 1) {
return ERROR_IO;
}
CHECK_EQ(marker, 0xff);
if (mSource->readAt(i++, &marker, 1) != 1) {
return ERROR_IO;
}
CHECK(marker != 0xff);
uint16_t chunkSize;
if (!mSource->getUInt16(i, &chunkSize)) {
return ERROR_IO;
}
i += 2;
if (chunkSize < 2) {
return UNKNOWN_ERROR;
}
switch (marker) {
case JPEG_SOS:
{
return (mWidth > 0 && mHeight > 0) ? OK : UNKNOWN_ERROR;
}
case JPEG_EOI:
{
return UNKNOWN_ERROR;
}
case JPEG_SOF0:
case JPEG_SOF1:
case JPEG_SOF3:
case JPEG_SOF5:
case JPEG_SOF6:
case JPEG_SOF7:
case JPEG_SOF9:
case JPEG_SOF10:
case JPEG_SOF11:
case JPEG_SOF13:
case JPEG_SOF14:
case JPEG_SOF15:
{
uint16_t width, height;
if (!mSource->getUInt16(i + 1, &height)
|| !mSource->getUInt16(i + 3, &width)) {
return ERROR_IO;
}
mWidth = width;
mHeight = height;
i += chunkSize - 2;
break;
}
default:
{
// Skip chunk
i += chunkSize - 2;
break;
}
}
}
return OK;
}
} // namespace android
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