| /* |
| * 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. |
| */ |
| |
| //#define LOG_NDEBUG 0 |
| #define LOG_TAG "avc_utils" |
| #include <utils/Log.h> |
| |
| #include "include/avc_utils.h" |
| |
| #include <media/stagefright/foundation/ABitReader.h> |
| #include <media/stagefright/foundation/ADebug.h> |
| #include <media/stagefright/MediaDefs.h> |
| #include <media/stagefright/MediaErrors.h> |
| #include <media/stagefright/MetaData.h> |
| |
| namespace android { |
| |
| unsigned parseUE(ABitReader *br) { |
| unsigned numZeroes = 0; |
| while (br->getBits(1) == 0) { |
| ++numZeroes; |
| } |
| |
| unsigned x = br->getBits(numZeroes); |
| |
| return x + (1u << numZeroes) - 1; |
| } |
| |
| // Determine video dimensions from the sequence parameterset. |
| void FindAVCDimensions( |
| const sp<ABuffer> &seqParamSet, int32_t *width, int32_t *height) { |
| ABitReader br(seqParamSet->data() + 1, seqParamSet->size() - 1); |
| |
| unsigned profile_idc = br.getBits(8); |
| br.skipBits(16); |
| parseUE(&br); // seq_parameter_set_id |
| |
| unsigned chroma_format_idc = 1; // 4:2:0 chroma format |
| |
| if (profile_idc == 100 || profile_idc == 110 |
| || profile_idc == 122 || profile_idc == 244 |
| || profile_idc == 44 || profile_idc == 83 || profile_idc == 86) { |
| chroma_format_idc = parseUE(&br); |
| if (chroma_format_idc == 3) { |
| br.skipBits(1); // residual_colour_transform_flag |
| } |
| parseUE(&br); // bit_depth_luma_minus8 |
| parseUE(&br); // bit_depth_chroma_minus8 |
| br.skipBits(1); // qpprime_y_zero_transform_bypass_flag |
| CHECK_EQ(br.getBits(1), 0u); // seq_scaling_matrix_present_flag |
| } |
| |
| parseUE(&br); // log2_max_frame_num_minus4 |
| unsigned pic_order_cnt_type = parseUE(&br); |
| |
| if (pic_order_cnt_type == 0) { |
| parseUE(&br); // log2_max_pic_order_cnt_lsb_minus4 |
| } else if (pic_order_cnt_type == 1) { |
| // offset_for_non_ref_pic, offset_for_top_to_bottom_field and |
| // offset_for_ref_frame are technically se(v), but since we are |
| // just skipping over them the midpoint does not matter. |
| |
| br.getBits(1); // delta_pic_order_always_zero_flag |
| parseUE(&br); // offset_for_non_ref_pic |
| parseUE(&br); // offset_for_top_to_bottom_field |
| |
| unsigned num_ref_frames_in_pic_order_cnt_cycle = parseUE(&br); |
| for (unsigned i = 0; i < num_ref_frames_in_pic_order_cnt_cycle; ++i) { |
| parseUE(&br); // offset_for_ref_frame |
| } |
| } |
| |
| parseUE(&br); // num_ref_frames |
| br.getBits(1); // gaps_in_frame_num_value_allowed_flag |
| |
| unsigned pic_width_in_mbs_minus1 = parseUE(&br); |
| unsigned pic_height_in_map_units_minus1 = parseUE(&br); |
| unsigned frame_mbs_only_flag = br.getBits(1); |
| |
| *width = pic_width_in_mbs_minus1 * 16 + 16; |
| |
| *height = (2 - frame_mbs_only_flag) |
| * (pic_height_in_map_units_minus1 * 16 + 16); |
| |
| if (!frame_mbs_only_flag) { |
| br.getBits(1); // mb_adaptive_frame_field_flag |
| } |
| |
| br.getBits(1); // direct_8x8_inference_flag |
| |
| if (br.getBits(1)) { // frame_cropping_flag |
| unsigned frame_crop_left_offset = parseUE(&br); |
| unsigned frame_crop_right_offset = parseUE(&br); |
| unsigned frame_crop_top_offset = parseUE(&br); |
| unsigned frame_crop_bottom_offset = parseUE(&br); |
| |
| unsigned cropUnitX, cropUnitY; |
| if (chroma_format_idc == 0 /* monochrome */) { |
| cropUnitX = 1; |
| cropUnitY = 2 - frame_mbs_only_flag; |
| } else { |
| unsigned subWidthC = (chroma_format_idc == 3) ? 1 : 2; |
| unsigned subHeightC = (chroma_format_idc == 1) ? 2 : 1; |
| |
| cropUnitX = subWidthC; |
| cropUnitY = subHeightC * (2 - frame_mbs_only_flag); |
| } |
| |
| LOGV("frame_crop = (%u, %u, %u, %u), cropUnitX = %u, cropUnitY = %u", |
| frame_crop_left_offset, frame_crop_right_offset, |
| frame_crop_top_offset, frame_crop_bottom_offset, |
| cropUnitX, cropUnitY); |
| |
| *width -= |
| (frame_crop_left_offset + frame_crop_right_offset) * cropUnitX; |
| *height -= |
| (frame_crop_top_offset + frame_crop_bottom_offset) * cropUnitY; |
| } |
| } |
| |
| status_t getNextNALUnit( |
| const uint8_t **_data, size_t *_size, |
| const uint8_t **nalStart, size_t *nalSize, |
| bool startCodeFollows) { |
| const uint8_t *data = *_data; |
| size_t size = *_size; |
| |
| *nalStart = NULL; |
| *nalSize = 0; |
| |
| if (size == 0) { |
| return -EAGAIN; |
| } |
| |
| // Skip any number of leading 0x00. |
| |
| size_t offset = 0; |
| while (offset < size && data[offset] == 0x00) { |
| ++offset; |
| } |
| |
| if (offset == size) { |
| return -EAGAIN; |
| } |
| |
| // A valid startcode consists of at least two 0x00 bytes followed by 0x01. |
| |
| if (offset < 2 || data[offset] != 0x01) { |
| return ERROR_MALFORMED; |
| } |
| |
| ++offset; |
| |
| size_t startOffset = offset; |
| |
| for (;;) { |
| while (offset < size && data[offset] != 0x01) { |
| ++offset; |
| } |
| |
| if (offset == size) { |
| if (startCodeFollows) { |
| offset = size + 2; |
| break; |
| } |
| |
| return -EAGAIN; |
| } |
| |
| if (data[offset - 1] == 0x00 && data[offset - 2] == 0x00) { |
| break; |
| } |
| |
| ++offset; |
| } |
| |
| size_t endOffset = offset - 2; |
| while (data[endOffset - 1] == 0x00) { |
| --endOffset; |
| } |
| |
| *nalStart = &data[startOffset]; |
| *nalSize = endOffset - startOffset; |
| |
| if (offset + 2 < size) { |
| *_data = &data[offset - 2]; |
| *_size = size - offset + 2; |
| } else { |
| *_data = NULL; |
| *_size = 0; |
| } |
| |
| return OK; |
| } |
| |
| static sp<ABuffer> FindNAL( |
| const uint8_t *data, size_t size, unsigned nalType, |
| size_t *stopOffset) { |
| const uint8_t *nalStart; |
| size_t nalSize; |
| while (getNextNALUnit(&data, &size, &nalStart, &nalSize, true) == OK) { |
| if ((nalStart[0] & 0x1f) == nalType) { |
| sp<ABuffer> buffer = new ABuffer(nalSize); |
| memcpy(buffer->data(), nalStart, nalSize); |
| return buffer; |
| } |
| } |
| |
| return NULL; |
| } |
| |
| const char *AVCProfileToString(uint8_t profile) { |
| switch (profile) { |
| case kAVCProfileBaseline: |
| return "Baseline"; |
| case kAVCProfileMain: |
| return "Main"; |
| case kAVCProfileExtended: |
| return "Extended"; |
| case kAVCProfileHigh: |
| return "High"; |
| case kAVCProfileHigh10: |
| return "High 10"; |
| case kAVCProfileHigh422: |
| return "High 422"; |
| case kAVCProfileHigh444: |
| return "High 444"; |
| case kAVCProfileCAVLC444Intra: |
| return "CAVLC 444 Intra"; |
| default: return "Unknown"; |
| } |
| } |
| |
| sp<MetaData> MakeAVCCodecSpecificData(const sp<ABuffer> &accessUnit) { |
| const uint8_t *data = accessUnit->data(); |
| size_t size = accessUnit->size(); |
| |
| sp<ABuffer> seqParamSet = FindNAL(data, size, 7, NULL); |
| if (seqParamSet == NULL) { |
| return NULL; |
| } |
| |
| int32_t width, height; |
| FindAVCDimensions(seqParamSet, &width, &height); |
| |
| size_t stopOffset; |
| sp<ABuffer> picParamSet = FindNAL(data, size, 8, &stopOffset); |
| CHECK(picParamSet != NULL); |
| |
| size_t csdSize = |
| 1 + 3 + 1 + 1 |
| + 2 * 1 + seqParamSet->size() |
| + 1 + 2 * 1 + picParamSet->size(); |
| |
| sp<ABuffer> csd = new ABuffer(csdSize); |
| uint8_t *out = csd->data(); |
| |
| *out++ = 0x01; // configurationVersion |
| memcpy(out, seqParamSet->data() + 1, 3); // profile/level... |
| |
| uint8_t profile = out[0]; |
| uint8_t level = out[2]; |
| |
| out += 3; |
| *out++ = (0x3f << 2) | 1; // lengthSize == 2 bytes |
| *out++ = 0xe0 | 1; |
| |
| *out++ = seqParamSet->size() >> 8; |
| *out++ = seqParamSet->size() & 0xff; |
| memcpy(out, seqParamSet->data(), seqParamSet->size()); |
| out += seqParamSet->size(); |
| |
| *out++ = 1; |
| |
| *out++ = picParamSet->size() >> 8; |
| *out++ = picParamSet->size() & 0xff; |
| memcpy(out, picParamSet->data(), picParamSet->size()); |
| |
| #if 0 |
| LOGI("AVC seq param set"); |
| hexdump(seqParamSet->data(), seqParamSet->size()); |
| #endif |
| |
| sp<MetaData> meta = new MetaData; |
| meta->setCString(kKeyMIMEType, MEDIA_MIMETYPE_VIDEO_AVC); |
| |
| meta->setData(kKeyAVCC, 0, csd->data(), csd->size()); |
| meta->setInt32(kKeyWidth, width); |
| meta->setInt32(kKeyHeight, height); |
| |
| LOGI("found AVC codec config (%d x %d, %s-profile level %d.%d)", |
| width, height, AVCProfileToString(profile), level / 10, level % 10); |
| |
| return meta; |
| } |
| |
| bool IsIDR(const sp<ABuffer> &buffer) { |
| const uint8_t *data = buffer->data(); |
| size_t size = buffer->size(); |
| |
| bool foundIDR = false; |
| |
| const uint8_t *nalStart; |
| size_t nalSize; |
| while (getNextNALUnit(&data, &size, &nalStart, &nalSize, true) == OK) { |
| CHECK_GT(nalSize, 0u); |
| |
| unsigned nalType = nalStart[0] & 0x1f; |
| |
| if (nalType == 5) { |
| foundIDR = true; |
| break; |
| } |
| } |
| |
| return foundIDR; |
| } |
| |
| } // namespace android |
| |