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Diffstat (limited to 'webrtc/modules/video_coding/main/source/decoding_state.cc')
| -rw-r--r-- | webrtc/modules/video_coding/main/source/decoding_state.cc | 223 |
1 files changed, 0 insertions, 223 deletions
diff --git a/webrtc/modules/video_coding/main/source/decoding_state.cc b/webrtc/modules/video_coding/main/source/decoding_state.cc deleted file mode 100644 index cc92f1c83f..0000000000 --- a/webrtc/modules/video_coding/main/source/decoding_state.cc +++ /dev/null @@ -1,223 +0,0 @@ -/* - * Copyright (c) 2011 The WebRTC project authors. All Rights Reserved. - * - * Use of this source code is governed by a BSD-style license - * that can be found in the LICENSE file in the root of the source - * tree. An additional intellectual property rights grant can be found - * in the file PATENTS. All contributing project authors may - * be found in the AUTHORS file in the root of the source tree. - */ - -#include "webrtc/modules/video_coding/main/source/decoding_state.h" - -#include "webrtc/modules/interface/module_common_types.h" -#include "webrtc/modules/video_coding/main/source/frame_buffer.h" -#include "webrtc/modules/video_coding/main/source/jitter_buffer_common.h" -#include "webrtc/modules/video_coding/main/source/packet.h" - -namespace webrtc { - -VCMDecodingState::VCMDecodingState() - : sequence_num_(0), - time_stamp_(0), - picture_id_(kNoPictureId), - temporal_id_(kNoTemporalIdx), - tl0_pic_id_(kNoTl0PicIdx), - full_sync_(true), - in_initial_state_(true) {} - -VCMDecodingState::~VCMDecodingState() {} - -void VCMDecodingState::Reset() { - // TODO(mikhal): Verify - not always would want to reset the sync - sequence_num_ = 0; - time_stamp_ = 0; - picture_id_ = kNoPictureId; - temporal_id_ = kNoTemporalIdx; - tl0_pic_id_ = kNoTl0PicIdx; - full_sync_ = true; - in_initial_state_ = true; -} - -uint32_t VCMDecodingState::time_stamp() const { - return time_stamp_; -} - -uint16_t VCMDecodingState::sequence_num() const { - return sequence_num_; -} - -bool VCMDecodingState::IsOldFrame(const VCMFrameBuffer* frame) const { - assert(frame != NULL); - if (in_initial_state_) - return false; - return !IsNewerTimestamp(frame->TimeStamp(), time_stamp_); -} - -bool VCMDecodingState::IsOldPacket(const VCMPacket* packet) const { - assert(packet != NULL); - if (in_initial_state_) - return false; - return !IsNewerTimestamp(packet->timestamp, time_stamp_); -} - -void VCMDecodingState::SetState(const VCMFrameBuffer* frame) { - assert(frame != NULL && frame->GetHighSeqNum() >= 0); - UpdateSyncState(frame); - sequence_num_ = static_cast<uint16_t>(frame->GetHighSeqNum()); - time_stamp_ = frame->TimeStamp(); - picture_id_ = frame->PictureId(); - temporal_id_ = frame->TemporalId(); - tl0_pic_id_ = frame->Tl0PicId(); - in_initial_state_ = false; -} - -void VCMDecodingState::CopyFrom(const VCMDecodingState& state) { - sequence_num_ = state.sequence_num_; - time_stamp_ = state.time_stamp_; - picture_id_ = state.picture_id_; - temporal_id_ = state.temporal_id_; - tl0_pic_id_ = state.tl0_pic_id_; - full_sync_ = state.full_sync_; - in_initial_state_ = state.in_initial_state_; -} - -bool VCMDecodingState::UpdateEmptyFrame(const VCMFrameBuffer* frame) { - bool empty_packet = frame->GetHighSeqNum() == frame->GetLowSeqNum(); - if (in_initial_state_ && empty_packet) { - // Drop empty packets as long as we are in the initial state. - return true; - } - if ((empty_packet && ContinuousSeqNum(frame->GetHighSeqNum())) || - ContinuousFrame(frame)) { - // Continuous empty packets or continuous frames can be dropped if we - // advance the sequence number. - sequence_num_ = frame->GetHighSeqNum(); - time_stamp_ = frame->TimeStamp(); - return true; - } - return false; -} - -void VCMDecodingState::UpdateOldPacket(const VCMPacket* packet) { - assert(packet != NULL); - if (packet->timestamp == time_stamp_) { - // Late packet belonging to the last decoded frame - make sure we update the - // last decoded sequence number. - sequence_num_ = LatestSequenceNumber(packet->seqNum, sequence_num_); - } -} - -void VCMDecodingState::SetSeqNum(uint16_t new_seq_num) { - sequence_num_ = new_seq_num; -} - -bool VCMDecodingState::in_initial_state() const { - return in_initial_state_; -} - -bool VCMDecodingState::full_sync() const { - return full_sync_; -} - -void VCMDecodingState::UpdateSyncState(const VCMFrameBuffer* frame) { - if (in_initial_state_) - return; - if (frame->TemporalId() == kNoTemporalIdx || - frame->Tl0PicId() == kNoTl0PicIdx) { - full_sync_ = true; - } else if (frame->FrameType() == kVideoFrameKey || frame->LayerSync()) { - full_sync_ = true; - } else if (full_sync_) { - // Verify that we are still in sync. - // Sync will be broken if continuity is true for layers but not for the - // other methods (PictureId and SeqNum). - if (UsingPictureId(frame)) { - // First check for a valid tl0PicId. - if (frame->Tl0PicId() - tl0_pic_id_ > 1) { - full_sync_ = false; - } else { - full_sync_ = ContinuousPictureId(frame->PictureId()); - } - } else { - full_sync_ = ContinuousSeqNum(static_cast<uint16_t>( - frame->GetLowSeqNum())); - } - } -} - -bool VCMDecodingState::ContinuousFrame(const VCMFrameBuffer* frame) const { - // Check continuity based on the following hierarchy: - // - Temporal layers (stop here if out of sync). - // - Picture Id when available. - // - Sequence numbers. - // Return true when in initial state. - // Note that when a method is not applicable it will return false. - assert(frame != NULL); - // A key frame is always considered continuous as it doesn't refer to any - // frames and therefore won't introduce any errors even if prior frames are - // missing. - if (frame->FrameType() == kVideoFrameKey) - return true; - // When in the initial state we always require a key frame to start decoding. - if (in_initial_state_) - return false; - if (ContinuousLayer(frame->TemporalId(), frame->Tl0PicId())) - return true; - // tl0picId is either not used, or should remain unchanged. - if (frame->Tl0PicId() != tl0_pic_id_) - return false; - // Base layers are not continuous or temporal layers are inactive. - // In the presence of temporal layers, check for Picture ID/sequence number - // continuity if sync can be restored by this frame. - if (!full_sync_ && !frame->LayerSync()) - return false; - if (UsingPictureId(frame)) { - return ContinuousPictureId(frame->PictureId()); - } else { - return ContinuousSeqNum(static_cast<uint16_t>(frame->GetLowSeqNum())); - } -} - -bool VCMDecodingState::ContinuousPictureId(int picture_id) const { - int next_picture_id = picture_id_ + 1; - if (picture_id < picture_id_) { - // Wrap - if (picture_id_ >= 0x80) { - // 15 bits used for picture id - return ((next_picture_id & 0x7FFF) == picture_id); - } else { - // 7 bits used for picture id - return ((next_picture_id & 0x7F) == picture_id); - } - } - // No wrap - return (next_picture_id == picture_id); -} - -bool VCMDecodingState::ContinuousSeqNum(uint16_t seq_num) const { - return seq_num == static_cast<uint16_t>(sequence_num_ + 1); -} - -bool VCMDecodingState::ContinuousLayer(int temporal_id, - int tl0_pic_id) const { - // First, check if applicable. - if (temporal_id == kNoTemporalIdx || tl0_pic_id == kNoTl0PicIdx) - return false; - // If this is the first frame to use temporal layers, make sure we start - // from base. - else if (tl0_pic_id_ == kNoTl0PicIdx && temporal_id_ == kNoTemporalIdx && - temporal_id == 0) - return true; - - // Current implementation: Look for base layer continuity. - if (temporal_id != 0) - return false; - return (static_cast<uint8_t>(tl0_pic_id_ + 1) == tl0_pic_id); -} - -bool VCMDecodingState::UsingPictureId(const VCMFrameBuffer* frame) const { - return (frame->PictureId() != kNoPictureId && picture_id_ != kNoPictureId); -} - -} // namespace webrtc |