| /* |
| * 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. |
| */ |
| |
| #ifndef AVC_UTILS_H_ |
| |
| #define AVC_UTILS_H_ |
| |
| #include <media/stagefright/foundation/ABuffer.h> |
| #include <utils/Errors.h> |
| |
| namespace android { |
| |
| class ABitReader; |
| |
| enum { |
| kAVCProfileBaseline = 0x42, |
| kAVCProfileMain = 0x4d, |
| kAVCProfileExtended = 0x58, |
| kAVCProfileHigh = 0x64, |
| kAVCProfileHigh10 = 0x6e, |
| kAVCProfileHigh422 = 0x7a, |
| kAVCProfileHigh444 = 0xf4, |
| kAVCProfileCAVLC444Intra = 0x2c |
| }; |
| |
| struct NALPosition { |
| size_t nalOffset; |
| size_t nalSize; |
| }; |
| |
| // Optionally returns sample aspect ratio as well. |
| void FindAVCDimensions( |
| const sp<ABuffer> &seqParamSet, |
| int32_t *width, int32_t *height, |
| int32_t *sarWidth = NULL, int32_t *sarHeight = NULL); |
| |
| // Gets and returns an unsigned exp-golomb (ue) value from a bit reader |br|. Aborts if the value |
| // is more than 64 bits long (>=0xFFFF (!)) or the bit reader overflows. |
| unsigned parseUE(ABitReader *br); |
| |
| // Gets and returns a signed exp-golomb (se) value from a bit reader |br|. Aborts if the value is |
| // more than 64 bits long (>0x7FFF || <-0x7FFF (!)) or the bit reader overflows. |
| signed parseSE(ABitReader *br); |
| |
| // Gets an unsigned exp-golomb (ue) value from a bit reader |br|, and returns it if it was |
| // successful. Returns |fallback| if it was unsuccessful. Note: if the value was longer that 64 |
| // bits, it reads past the value and still returns |fallback|. |
| unsigned parseUEWithFallback(ABitReader *br, unsigned fallback); |
| |
| // Gets a signed exp-golomb (se) value from a bit reader |br|, and returns it if it was successful. |
| // Returns |fallback| if it was unsuccessful. Note: if the value was longer that 64 bits, it reads |
| // past the value and still returns |fallback|. |
| signed parseSEWithFallback(ABitReader *br, signed fallback); |
| |
| // Skips an unsigned exp-golomb (ue) value from bit reader |br|. |
| inline void skipUE(ABitReader *br) { |
| (void)parseUEWithFallback(br, 0U); |
| } |
| |
| // Skips a signed exp-golomb (se) value from bit reader |br|. |
| inline void skipSE(ABitReader *br) { |
| (void)parseSEWithFallback(br, 0); |
| } |
| |
| status_t getNextNALUnit( |
| const uint8_t **_data, size_t *_size, |
| const uint8_t **nalStart, size_t *nalSize, |
| bool startCodeFollows = false); |
| |
| class MetaData; |
| sp<MetaData> MakeAVCCodecSpecificData(const sp<ABuffer> &accessUnit); |
| |
| bool IsIDR(const sp<ABuffer> &accessUnit); |
| bool IsAVCReferenceFrame(const sp<ABuffer> &accessUnit); |
| |
| const char *AVCProfileToString(uint8_t profile); |
| |
| sp<MetaData> MakeAACCodecSpecificData( |
| unsigned profile, unsigned sampling_freq_index, |
| unsigned channel_configuration); |
| |
| // Given an MPEG4 video VOL-header chunk (starting with 0x00 0x00 0x01 0x2?) |
| // parse it and fill in dimensions, returns true iff successful. |
| bool ExtractDimensionsFromVOLHeader( |
| const uint8_t *data, size_t size, int32_t *width, int32_t *height); |
| |
| bool GetMPEGAudioFrameSize( |
| uint32_t header, size_t *frame_size, |
| int *out_sampling_rate = NULL, int *out_channels = NULL, |
| int *out_bitrate = NULL, int *out_num_samples = NULL); |
| |
| } // namespace android |
| |
| #endif // AVC_UTILS_H_ |