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Update to rate-mismatch factor in media_opt_util.

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Review URL: http://webrtc-codereview.appspot.com/193003

git-svn-id: http://webrtc.googlecode.com/svn/trunk@678 4adac7df-926f-26a2-2b94-8c16560cd09d
This commit is contained in:
marpan@google.com
2011-10-03 19:09:45 +00:00
parent 99239d5a41
commit f1f3fb33b5
1 changed files with 8 additions and 2 deletions
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10
src/modules/video_coding/main/source/media_opt_util.cc
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@@ -442,12 +442,18 @@ VCMFecMethod::ProtectionFactor(const VCMProtectionParameters* parameters)
// is based on rounding off protectionFactor on actual source packet number). // is based on rounding off protectionFactor on actual source packet number).
// The correction factor (_corrFecCost) attempts to corrects this, at least // The correction factor (_corrFecCost) attempts to corrects this, at least
// for cases of low rates (small #packets) and low protection levels. // for cases of low rates (small #packets) and low protection levels.
float numPacketsFl = 1.0f + ((float) bitRatePerFrame * 1000.0
/ (float) (8.0 * _maxPayloadSize) + 0.5);
const float estNumFecGen = 0.5f + static_cast<float> (_protectionFactorD * const float estNumFecGen = 0.5f + static_cast<float> (_protectionFactorD *
avgTotPackets / 255.0f); numPacketsFl / 255.0f);
// We reduce cost factor (which will reduce overhead for FEC and // We reduce cost factor (which will reduce overhead for FEC and
// hybrid method) and not the protectionFactor. // hybrid method) and not the protectionFactor.
_corrFecCost = 1.0f; _corrFecCost = 1.0f;
if (estNumFecGen < 1.5f && _protectionFactorD < minProtLevelFec) if (estNumFecGen < 1.1f && _protectionFactorD < minProtLevelFec)
{ {
_corrFecCost = 0.5f; _corrFecCost = 0.5f;
} }