Add H264 bitstream rewriting to limit frame reordering marker in header

webrtc/modules/rtp_rtcp/source/h264_sps_parser_unittest.cc

-/*
- *  Copyright (c) 2015 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/rtp_rtcp/source/h264_sps_parser.h"
-
-#include "testing/gtest/include/gtest/gtest.h"
-
-#include "webrtc/base/arraysize.h"
-#include "webrtc/base/bitbuffer.h"
-
-namespace webrtc {
-
-// Example SPS can be generated with ffmpeg. Here's an example set of commands,
-// runnable on OS X:
-// 1) Generate a video, from the camera:
-// ffmpeg -f avfoundation -i "0" -video_size 640x360 camera.mov
-//
-// 2) Scale the video to the desired size:
-// ffmpeg -i camera.mov -vf scale=640x360 scaled.mov
-//
-// 3) Get just the H.264 bitstream in AnnexB:
-// ffmpeg -i scaled.mov -vcodec copy -vbsf h264_mp4toannexb -an out.h264
-//
-// 4) Open out.h264 and find the SPS, generally everything between the first
-// two start codes (0 0 0 1 or 0 0 1). The first byte should be 0x67,
-// which should be stripped out before being passed to the parser.
-
-static const size_t kSpsBufferMaxSize = 256;
-
-// Generates a fake SPS with basically everything empty but the width/height.
-// Pass in a buffer of at least kSpsBufferMaxSize.
-// The fake SPS that this generates also always has at least one emulation byte
-// at offset 2, since the first two bytes are always 0, and has a 0x3 as the
-// level_idc, to make sure the parser doesn't eat all 0x3 bytes.
-void GenerateFakeSps(uint16_t width, uint16_t height, uint8_t buffer[]) {
-  uint8_t rbsp[kSpsBufferMaxSize] = {0};
-  rtc::BitBufferWriter writer(rbsp, kSpsBufferMaxSize);
-  // Profile byte.
-  writer.WriteUInt8(0);
-  // Constraint sets and reserved zero bits.
-  writer.WriteUInt8(0);
-  // level_idc.
-  writer.WriteUInt8(0x3u);
-  // seq_paramter_set_id.
-  writer.WriteExponentialGolomb(0);
-  // Profile is not special, so we skip all the chroma format settings.
-
-  // Now some bit magic.
-  // log2_max_frame_num_minus4: ue(v). 0 is fine.
-  writer.WriteExponentialGolomb(0);
-  // pic_order_cnt_type: ue(v). 0 is the type we want.
-  writer.WriteExponentialGolomb(0);
-  // log2_max_pic_order_cnt_lsb_minus4: ue(v). 0 is fine.
-  writer.WriteExponentialGolomb(0);
-  // max_num_ref_frames: ue(v). 0 is fine.
-  writer.WriteExponentialGolomb(0);
-  // gaps_in_frame_num_value_allowed_flag: u(1).
-  writer.WriteBits(0, 1);
-  // Next are width/height. First, calculate the mbs/map_units versions.
-  uint16_t width_in_mbs_minus1 = (width + 15) / 16 - 1;
-
-  // For the height, we're going to define frame_mbs_only_flag, so we need to
-  // divide by 2. See the parser for the full calculation.
-  uint16_t height_in_map_units_minus1 = ((height + 15) / 16 - 1) / 2;
-  // Write each as ue(v).
-  writer.WriteExponentialGolomb(width_in_mbs_minus1);
-  writer.WriteExponentialGolomb(height_in_map_units_minus1);
-  // frame_mbs_only_flag: u(1). Needs to be false.
-  writer.WriteBits(0, 1);
-  // mb_adaptive_frame_field_flag: u(1).
-  writer.WriteBits(0, 1);
-  // direct_8x8_inferene_flag: u(1).
-  writer.WriteBits(0, 1);
-  // frame_cropping_flag: u(1). 1, so we can supply crop.
-  writer.WriteBits(1, 1);
-  // Now we write the left/right/top/bottom crop. For simplicity, we'll put all
-  // the crop at the left/top.
-  // We picked a 4:2:0 format, so the crops are 1/2 the pixel crop values.
-  // Left/right.
-  writer.WriteExponentialGolomb(((16 - (width % 16)) % 16) / 2);
-  writer.WriteExponentialGolomb(0);
-  // Top/bottom.
-  writer.WriteExponentialGolomb(((16 - (height % 16)) % 16) / 2);
-  writer.WriteExponentialGolomb(0);
-
-  // Get the number of bytes written (including the last partial byte).
-  size_t byte_count, bit_offset;
-  writer.GetCurrentOffset(&byte_count, &bit_offset);
-  if (bit_offset > 0) {
-    byte_count++;
-  }
-
-  // Now, we need to write the rbsp into bytes. To do that, we'll need to add
-  // emulation 0x03 bytes if there's ever a sequence of 00 00 01 or 00 00 00 01.
-  // To be simple, just add a 0x03 after every 0x00. Extra emulation doesn't
-  // hurt.
-  for (size_t i = 0; i < byte_count;) {
-    // The -3 is intentional; we never need to write an emulation byte if the 00
-    // is at the end.
-    if (i < byte_count - 3 && rbsp[i] == 0 && rbsp[i + 1] == 0) {
-      *buffer++ = rbsp[i];
-      *buffer++ = rbsp[i + 1];
-      *buffer++ = 0x3u;
-      i += 2;
-    } else {
-      *buffer++ = rbsp[i];
-      ++i;
-    }
-  }
-}
-
-TEST(H264SpsParserTest, TestSampleSPSHdLandscape) {
-  // SPS for a 1280x720 camera capture from ffmpeg on osx. Contains
-  // emulation bytes but no cropping.
-  const uint8_t buffer[] = {0x7A, 0x00, 0x1F, 0xBC, 0xD9, 0x40, 0x50, 0x05,
-                            0xBA, 0x10, 0x00, 0x00, 0x03, 0x00, 0xC0, 0x00,
-                            0x00, 0x2A, 0xE0, 0xF1, 0x83, 0x19, 0x60};
-  H264SpsParser parser = H264SpsParser(buffer, arraysize(buffer));
-  EXPECT_TRUE(parser.Parse());
-  EXPECT_EQ(1280u, parser.width());
-  EXPECT_EQ(720u, parser.height());
-}
-
-TEST(H264SpsParserTest, TestSampleSPSVgaLandscape) {
-  // SPS for a 640x360 camera capture from ffmpeg on osx. Contains emulation
-  // bytes and cropping (360 isn't divisible by 16).
-  const uint8_t buffer[] = {0x7A, 0x00, 0x1E, 0xBC, 0xD9, 0x40, 0xA0, 0x2F,
-                            0xF8, 0x98, 0x40, 0x00, 0x00, 0x03, 0x01, 0x80,
-                            0x00, 0x00, 0x56, 0x83, 0xC5, 0x8B, 0x65, 0x80};
-  H264SpsParser parser = H264SpsParser(buffer, arraysize(buffer));
-  EXPECT_TRUE(parser.Parse());
-  EXPECT_EQ(640u, parser.width());
-  EXPECT_EQ(360u, parser.height());
-}
-
-TEST(H264SpsParserTest, TestSampleSPSWeirdResolution) {
-  // SPS for a 200x400 camera capture from ffmpeg on osx. Horizontal and
-  // veritcal crop (neither dimension is divisible by 16).
-  const uint8_t buffer[] = {0x7A, 0x00, 0x0D, 0xBC, 0xD9, 0x43, 0x43, 0x3E,
-                            0x5E, 0x10, 0x00, 0x00, 0x03, 0x00, 0x60, 0x00,
-                            0x00, 0x15, 0xA0, 0xF1, 0x42, 0x99, 0x60};
-  H264SpsParser parser = H264SpsParser(buffer, arraysize(buffer));
-  EXPECT_TRUE(parser.Parse());
-  EXPECT_EQ(200u, parser.width());
-  EXPECT_EQ(400u, parser.height());
-}
-
-TEST(H264SpsParserTest, TestSyntheticSPSQvgaLandscape) {
-  uint8_t buffer[kSpsBufferMaxSize] = {0};
-  GenerateFakeSps(320u, 180u, buffer);
-  H264SpsParser parser = H264SpsParser(buffer, arraysize(buffer));
-  EXPECT_TRUE(parser.Parse());
-  EXPECT_EQ(320u, parser.width());
-  EXPECT_EQ(180u, parser.height());
-}
-
-TEST(H264SpsParserTest, TestSyntheticSPSWeirdResolution) {
-  uint8_t buffer[kSpsBufferMaxSize] = {0};
-  GenerateFakeSps(156u, 122u, buffer);
-  H264SpsParser parser = H264SpsParser(buffer, arraysize(buffer));
-  EXPECT_TRUE(parser.Parse());
-  EXPECT_EQ(156u, parser.width());
-  EXPECT_EQ(122u, parser.height());
-}
-
-}  // namespace webrtc