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| author | Reimar Döffinger <Reimar.Doeffinger@gmx.de> | 2010-01-28 20:15:19 +0000 |
|---|---|---|
| committer | Reimar Döffinger <Reimar.Doeffinger@gmx.de> | 2010-01-28 20:15:19 +0000 |
| commit | 88517e9f9d684e58a641cc77b68df377d82fad5b (patch) | |
| tree | f23f974536257ed9e671f9e5f9ca4bc98ccec805 /libavcodec/mpc7.c | |
| parent | 604b2f5276d9cc283ae75df9b64eee7c5f33792a (diff) | |
| download | ffmpeg-88517e9f9d684e58a641cc77b68df377d82fad5b.tar.gz | |
Extract duplicated code into a separate function.
5% faster on Intel Atom with gcc 4.4.1 (performance is unchanged
if using av_always_inline).
Originally committed as revision 21516 to svn://svn.ffmpeg.org/ffmpeg/trunk
Diffstat (limited to 'libavcodec/mpc7.c')
| -rw-r--r-- | libavcodec/mpc7.c | 23 |
1 files changed, 13 insertions, 10 deletions
diff --git a/libavcodec/mpc7.c b/libavcodec/mpc7.c index e80b8927f2..ac57f4a62a 100644 --- a/libavcodec/mpc7.c +++ b/libavcodec/mpc7.c @@ -175,6 +175,14 @@ static inline void idx_to_quant(MPCContext *c, GetBitContext *gb, int idx, int * } } +static int get_scale_idx(GetBitContext *gb, int ref) +{ + int t = get_vlc2(gb, dscf_vlc.table, MPC7_DSCF_BITS, 1) - 7; + if (t == 8) + return get_bits(gb, 6); + return ref + t; +} + static int mpc7_decode_frame(AVCodecContext * avctx, void *data, int *data_size, AVPacket *avpkt) @@ -222,24 +230,19 @@ static int mpc7_decode_frame(AVCodecContext * avctx, for(ch = 0; ch < 2; ch++){ if(bands[i].res[ch]){ bands[i].scf_idx[ch][2] = c->oldDSCF[ch][i]; - t = get_vlc2(&gb, dscf_vlc.table, MPC7_DSCF_BITS, 1) - 7; - bands[i].scf_idx[ch][0] = (t == 8) ? get_bits(&gb, 6) : (bands[i].scf_idx[ch][2] + t); + bands[i].scf_idx[ch][0] = get_scale_idx(&gb, bands[i].scf_idx[ch][2]); switch(bands[i].scfi[ch]){ case 0: - t = get_vlc2(&gb, dscf_vlc.table, MPC7_DSCF_BITS, 1) - 7; - bands[i].scf_idx[ch][1] = (t == 8) ? get_bits(&gb, 6) : (bands[i].scf_idx[ch][0] + t); - t = get_vlc2(&gb, dscf_vlc.table, MPC7_DSCF_BITS, 1) - 7; - bands[i].scf_idx[ch][2] = (t == 8) ? get_bits(&gb, 6) : (bands[i].scf_idx[ch][1] + t); + bands[i].scf_idx[ch][1] = get_scale_idx(&gb, bands[i].scf_idx[ch][0]); + bands[i].scf_idx[ch][2] = get_scale_idx(&gb, bands[i].scf_idx[ch][1]); break; case 1: - t = get_vlc2(&gb, dscf_vlc.table, MPC7_DSCF_BITS, 1) - 7; - bands[i].scf_idx[ch][1] = (t == 8) ? get_bits(&gb, 6) : (bands[i].scf_idx[ch][0] + t); + bands[i].scf_idx[ch][1] = get_scale_idx(&gb, bands[i].scf_idx[ch][0]); bands[i].scf_idx[ch][2] = bands[i].scf_idx[ch][1]; break; case 2: bands[i].scf_idx[ch][1] = bands[i].scf_idx[ch][0]; - t = get_vlc2(&gb, dscf_vlc.table, MPC7_DSCF_BITS, 1) - 7; - bands[i].scf_idx[ch][2] = (t == 8) ? get_bits(&gb, 6) : (bands[i].scf_idx[ch][1] + t); + bands[i].scf_idx[ch][2] = get_scale_idx(&gb, bands[i].scf_idx[ch][1]); break; case 3: bands[i].scf_idx[ch][2] = bands[i].scf_idx[ch][1] = bands[i].scf_idx[ch][0]; |