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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 AVC_UTILS_H_
     18 
     19 #define AVC_UTILS_H_
     20 
     21 #include <media/stagefright/foundation/ABuffer.h>
     22 #include <utils/Errors.h>
     23 
     24 namespace android {
     25 
     26 class ABitReader;
     27 
     28 enum {
     29     kAVCProfileBaseline      = 0x42,
     30     kAVCProfileMain          = 0x4d,
     31     kAVCProfileExtended      = 0x58,
     32     kAVCProfileHigh          = 0x64,
     33     kAVCProfileHigh10        = 0x6e,
     34     kAVCProfileHigh422       = 0x7a,
     35     kAVCProfileHigh444       = 0xf4,
     36     kAVCProfileCAVLC444Intra = 0x2c
     37 };
     38 
     39 struct NALPosition {
     40     size_t nalOffset;
     41     size_t nalSize;
     42 };
     43 
     44 // Optionally returns sample aspect ratio as well.
     45 void FindAVCDimensions(
     46         const sp<ABuffer> &seqParamSet,
     47         int32_t *width, int32_t *height,
     48         int32_t *sarWidth = NULL, int32_t *sarHeight = NULL);
     49 
     50 unsigned parseUE(ABitReader *br);
     51 
     52 status_t getNextNALUnit(
     53         const uint8_t **_data, size_t *_size,
     54         const uint8_t **nalStart, size_t *nalSize,
     55         bool startCodeFollows = false);
     56 
     57 class MetaData;
     58 sp<MetaData> MakeAVCCodecSpecificData(const sp<ABuffer> &accessUnit);
     59 
     60 bool IsIDR(const sp<ABuffer> &accessUnit);
     61 bool IsAVCReferenceFrame(const sp<ABuffer> &accessUnit);
     62 
     63 const char *AVCProfileToString(uint8_t profile);
     64 
     65 sp<MetaData> MakeAACCodecSpecificData(
     66         unsigned profile, unsigned sampling_freq_index,
     67         unsigned channel_configuration);
     68 
     69 // Given an MPEG4 video VOL-header chunk (starting with 0x00 0x00 0x01 0x2?)
     70 // parse it and fill in dimensions, returns true iff successful.
     71 bool ExtractDimensionsFromVOLHeader(
     72         const uint8_t *data, size_t size, int32_t *width, int32_t *height);
     73 
     74 bool GetMPEGAudioFrameSize(
     75         uint32_t header, size_t *frame_size,
     76         int *out_sampling_rate = NULL, int *out_channels = NULL,
     77         int *out_bitrate = NULL, int *out_num_samples = NULL);
     78 
     79 }  // namespace android
     80 
     81 #endif  // AVC_UTILS_H_
     82