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      1 /*
      2  * Copyright (C) 2010 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 #ifndef VIDEO_SOURCE_H_
     18 
     19 #define VIDEO_SOURCE_H_
     20 
     21 #include <media/stagefright/MediaBufferGroup.h>
     22 #include <media/stagefright/MediaDefs.h>
     23 #include <media/stagefright/MediaSource.h>
     24 #include <media/stagefright/MetaData.h>
     25 
     26 namespace android {
     27 
     28 class VideoSource : public MediaSource {
     29     static const int32_t kFramerate = 24;  // fps
     30 
     31 public:
     32     VideoSource(int width, int height)
     33         : mWidth(width),
     34           mHeight(height),
     35           mSize((width * height * 3) / 2) {
     36         mGroup.add_buffer(new MediaBuffer(mSize));
     37     }
     38 
     39     virtual sp<MetaData> getFormat() {
     40         sp<MetaData> meta = new MetaData;
     41         meta->setInt32(kKeyWidth, mWidth);
     42         meta->setInt32(kKeyHeight, mHeight);
     43         meta->setCString(kKeyMIMEType, MEDIA_MIMETYPE_VIDEO_RAW);
     44 
     45         return meta;
     46     }
     47 
     48     virtual status_t start(MetaData *params) {
     49         mNumFramesOutput = 0;
     50         return OK;
     51     }
     52 
     53     virtual status_t stop() {
     54         return OK;
     55     }
     56 
     57     virtual status_t read(
     58             MediaBuffer **buffer, const MediaSource::ReadOptions *options) {
     59         if (mNumFramesOutput == kFramerate * 100) {
     60             // Stop returning data after 10 secs.
     61             return ERROR_END_OF_STREAM;
     62         }
     63 
     64         // printf("VideoSource::read\n");
     65         status_t err = mGroup.acquire_buffer(buffer);
     66         if (err != OK) {
     67             return err;
     68         }
     69 
     70         char x = (char)((double)rand() / RAND_MAX * 255);
     71         memset((*buffer)->data(), x, mSize);
     72         (*buffer)->set_range(0, mSize);
     73         (*buffer)->meta_data()->clear();
     74         (*buffer)->meta_data()->setInt64(
     75                 kKeyTime, (mNumFramesOutput * 1000000) / kFramerate);
     76         ++mNumFramesOutput;
     77 
     78         // printf("VideoSource::read - returning buffer\n");
     79         // LOG(INFO)("VideoSource::read - returning buffer");
     80         return OK;
     81     }
     82 
     83 protected:
     84     virtual ~VideoSource() {}
     85 
     86 private:
     87     MediaBufferGroup mGroup;
     88     int mWidth, mHeight;
     89     size_t mSize;
     90     int64_t mNumFramesOutput;;
     91 
     92     VideoSource(const VideoSource &);
     93     VideoSource &operator=(const VideoSource &);
     94 };
     95 
     96 }  // namespace android
     97 
     98 #endif  // VIDEO_SOURCE_H_
     99