Chromium Code Reviews
chromiumcodereview-hr@appspot.gserviceaccount.com (chromiumcodereview-hr) | Please choose your nickname with Settings | Help | Chromium Project | Gerrit Changes | Sign out
(562)

Unified Diff: trunk/src/media/filters/h264_bitstream_buffer.h

Issue 350413002: Revert 279650 "Add VaapiVideoEncodeAccelerator for HW-accelerate..." (Closed) Base URL: svn://svn.chromium.org/chrome/
Patch Set: Created 6 years, 6 months ago
Use n/p to move between diff chunks; N/P to move between comments. Draft comments are only viewable by you.
Jump to:
View side-by-side diff with in-line comments
Download patch
Index: trunk/src/media/filters/h264_bitstream_buffer.h
===================================================================
--- trunk/src/media/filters/h264_bitstream_buffer.h (revision 279732)
+++ trunk/src/media/filters/h264_bitstream_buffer.h (working copy)
@@ -1,120 +0,0 @@
-// Copyright 2014 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-//
-// This file contains an implementation of a H264BitstreamBuffer class for
-// constructing raw bitstream buffers containing NAL units in
-// H.264 Annex-B stream format.
-// See H.264 spec Annex B and chapter 7for more details.
-
-#ifndef MEDIA_FILTERS_H264_BITSTREAM_BUFFER_H_
-#define MEDIA_FILTERS_H264_BITSTREAM_BUFFER_H_
-
-#include "base/gtest_prod_util.h"
-#include "base/numerics/safe_conversions.h"
-#include "media/base/media_export.h"
-#include "media/base/video_frame.h"
-#include "media/filters/h264_parser.h"
-
-namespace media {
-
-// Holds one or more NALUs as a raw bitstream buffer in H.264 Annex-B format.
-// Note that this class currently does NOT insert emulation prevention
-// three-byte sequences (spec 7.3.1).
-class MEDIA_EXPORT H264BitstreamBuffer {
- public:
- H264BitstreamBuffer();
- ~H264BitstreamBuffer();
-
- // Discard all data and reset the buffer for reuse.
- void Reset();
-
- // Append |num_bits| bits to the stream from |val|.
- // |val| is interpreted in the host endianness.
- template <typename T>
- void AppendBits(size_t num_bits, T val) {
- AppendU64(num_bits, static_cast<uint64>(val));
- }
-
- void AppendBits(size_t num_bits, bool val) {
- DCHECK_EQ(num_bits, 1ul);
- AppendBool(val);
- }
-
- // Append a one-bit bool/flag value |val| to the stream.
- void AppendBool(bool val);
-
- // Append a signed value in |val| in Exp-Golomb code.
- void AppendSE(int val);
-
- // Append an unsigned value in |val| in Exp-Golomb code.
- void AppendUE(unsigned int val);
-
- // Start a new NALU of type |nalu_type| and with given |nal_ref_idc|
- // (see spec). Note, that until FinishNALU() is called, some of the bits
- // may not be flushed into the buffer and the data will not be correctly
- // aligned with trailing bits.
- void BeginNALU(H264NALU::Type nalu_type, int nal_ref_idc);
-
- // Finish current NALU. This will flush any cached bits and correctly align
- // the buffer with RBSP trailing bits. This MUST be called for the stream
- // returned by data() to be correct.
- void FinishNALU();
-
- // Return number of full bytes in the stream. Note that FinishNALU() has to
- // be called to flush cached bits, or the return value will not include them.
- size_t BytesInBuffer();
-
- // Return a pointer to the stream. FinishNALU() must be called before
- // accessing the stream, otherwise some bits may still be cached and not
- // in the buffer.
- uint8* data();
-
- private:
- FRIEND_TEST_ALL_PREFIXES(H264BitstreamBufferAppendBitsTest,
- AppendAndVerifyBits);
-
- // Allocate additional memory (kGrowBytes bytes) for the buffer.
- void Grow();
-
- // Append |num_bits| bits from U64 value |val| (in host endianness).
- void AppendU64(size_t num_bits, uint64 val);
-
- // Flush any cached bits in the reg with byte granularity, i.e. enough
- // bytes to flush all pending bits, but not more.
- void FlushReg();
-
- typedef uint64 RegType;
- enum {
- // Sizes of reg_.
- kRegByteSize = sizeof(RegType),
- kRegBitSize = kRegByteSize * 8,
- // Amount of bytes to grow the buffer by when we run out of
- // previously-allocated memory for it.
- kGrowBytes = 4096,
- };
-
- COMPILE_ASSERT(kGrowBytes >= kRegByteSize,
- kGrowBytes_must_be_larger_than_kRegByteSize);
-
- // Unused bits left in reg_.
- size_t bits_left_in_reg_;
-
- // Cache for appended bits. Bits are flushed to data_ with kRegByteSize
- // granularity, i.e. when reg_ becomes full, or when an explicit FlushReg()
- // is called.
- RegType reg_;
-
- // Current capacity of data_, in bytes.
- size_t capacity_;
-
- // Current byte offset in data_ (points to the start of unwritten bits).
- size_t pos_;
-
- // Buffer for stream data.
- uint8* data_;
-};
-
-} // namespace media
-
-#endif // MEDIA_FILTERS_H264_BITSTREAM_BUFFER_H_
« no previous file with comments | « trunk/src/content/public/common/content_switches.cc ('k') | trunk/src/media/filters/h264_bitstream_buffer.cc » ('j') | no next file with comments »

Powered by Google App Engine
This is Rietveld 408576698