g722: Fix the QMF scaling

This fixes clipping if the encoder input used the full 16 bit
input range (samples with a magnitude below 16383 worked fine).
The filtered subband samples should be 15 bit maximum, while
the code earlier produced them scaled to 16 bit.

This makes the decoder output have double the magnitude
compared to before.

The spec reference samples doesn't test the QMF at all, which
was why this part slipped past initially.

Signed-off-by: Martin Storsjö <martin@martin.st>

5 files changed, 176 insertions, 176 deletions

diff --git a/libavcodec/g722dec.c b/libavcodec/g722dec.c
index 50a224ba10..72bb0ef3c7 100644
--- a/libavcodec/g722dec.c
+++ b/libavcodec/g722dec.c
@@ -126,8 +126,8 @@ static int g722_decode_frame(AVCodecContext *avctx, void *data,
         c->prev_samples[c->prev_samples_pos++] = rlow - rhigh;
         ff_g722_apply_qmf(c->prev_samples + c->prev_samples_pos - 24,
                           &xout1, &xout2);
-        *out_buf++ = av_clip_int16(xout1 >> 12);
-        *out_buf++ = av_clip_int16(xout2 >> 12);
+        *out_buf++ = av_clip_int16(xout1 >> 11);
+        *out_buf++ = av_clip_int16(xout2 >> 11);
         if (c->prev_samples_pos >= PREV_SAMPLES_BUF_SIZE) {
             memmove(c->prev_samples, c->prev_samples + c->prev_samples_pos - 22,
                     22 * sizeof(c->prev_samples[0]));
diff --git a/libavcodec/g722enc.c b/libavcodec/g722enc.c
index a5ae0a5153..ba8ceeff86 100644
--- a/libavcodec/g722enc.c
+++ b/libavcodec/g722enc.c
@@ -136,8 +136,8 @@ static inline void filter_samples(G722Context *c, const int16_t *samples,
     c->prev_samples[c->prev_samples_pos++] = samples[0];
     c->prev_samples[c->prev_samples_pos++] = samples[1];
     ff_g722_apply_qmf(c->prev_samples + c->prev_samples_pos - 24, &xout1, &xout2);
-    *xlow  = xout1 + xout2 >> 13;
-    *xhigh = xout1 - xout2 >> 13;
+    *xlow  = xout1 + xout2 >> 14;
+    *xhigh = xout1 - xout2 >> 14;
     if (c->prev_samples_pos >= PREV_SAMPLES_BUF_SIZE) {
         memmove(c->prev_samples,
                 c->prev_samples + c->prev_samples_pos - 22,
diff --git a/tests/ref/acodec/g722 b/tests/ref/acodec/g722
index 6ea492ae45..0e2f7e75b0 100644
--- a/tests/ref/acodec/g722
+++ b/tests/ref/acodec/g722
@@ -1,4 +1,4 @@
-1975cc4a3521e374b33ae042e182f6b6 *./tests/data/acodec/g722.wav
-48053 ./tests/data/acodec/g722.wav
-ade04cdcf249e6946395f109b077dd62 *./tests/data/g722.acodec.out.wav
-stddev: 8841.24 PSNR: 17.40 MAXDIFF:36225 bytes:   191980/  1058400
+7b0492eee76b04b710990235f97a0bf2 *./tests/data/acodec/g722.wav
+   48053 ./tests/data/acodec/g722.wav
+b5568e0e3930ff563824156e8e1015f0 *./tests/data/g722.acodec.out.wav
+stddev: 8939.44 PSNR: 17.30 MAXDIFF:40370 bytes:   191980/  1058400
diff --git a/tests/ref/fate/g722dec-1 b/tests/ref/fate/g722dec-1
index 55f125995d..e94c3e6a11 100644
--- a/tests/ref/fate/g722dec-1
+++ b/tests/ref/fate/g722dec-1
@@ -1,168 +1,168 @@
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+0,     155648,     155648,     2048,     4096, 0x82408396
+0,     157696,     157696,     2048,     4096, 0xc850ce0c
+0,     159744,     159744,     2048,     4096, 0x1d732d88
+0,     161792,     161792,     2048,     4096, 0xc5c01e33
+0,     163840,     163840,     2048,     4096, 0x84942d6c
+0,     165888,     165888,     2048,     4096, 0x7c27cd3a
+0,     167936,     167936,     2048,     4096, 0x22adc503
+0,     169984,     169984,     2048,     4096, 0xfbc3af31
+0,     172032,     172032,     2048,     4096, 0xe9652b18
+0,     174080,     174080,     2048,     4096, 0xae75987e
+0,     176128,     176128,     2048,     4096, 0x0f7ea428
+0,     178176,     178176,     2048,     4096, 0x92b89582
+0,     180224,     180224,     2048,     4096, 0xf393d910
+0,     182272,     182272,     2048,     4096, 0x6349b600
+0,     184320,     184320,     2048,     4096, 0x16918dbd
+0,     186368,     186368,     2048,     4096, 0x14ee15ad
+0,     188416,     188416,     2048,     4096, 0x26b510d3
+0,     190464,     190464,     2048,     4096, 0x97007bf8
+0,     192512,     192512,     2048,     4096, 0x3718c509
+0,     194560,     194560,     2048,     4096, 0x24a54ccd
+0,     196608,     196608,     2048,     4096, 0xc960df4e
+0,     198656,     198656,     2048,     4096, 0xc7cb6e6f
+0,     200704,     200704,     2048,     4096, 0x4c563ae5
+0,     202752,     202752,     2048,     4096, 0x0dd51432
+0,     204800,     204800,     2048,     4096, 0xdb4243c8
+0,     206848,     206848,     2048,     4096, 0x9bb6417f
+0,     208896,     208896,     2048,     4096, 0xec6a40a1
+0,     210944,     210944,     2048,     4096, 0x82d6c3b4
+0,     212992,     212992,     2048,     4096, 0xd181e2ec
+0,     215040,     215040,     2048,     4096, 0xba5d7b55
+0,     217088,     217088,     2048,     4096, 0x78fcb938
+0,     219136,     219136,     2048,     4096, 0x6691671c
+0,     221184,     221184,     2048,     4096, 0x44fadee7
+0,     223232,     223232,     2048,     4096, 0xa42720d5
+0,     225280,     225280,     2048,     4096, 0xc1165a91
+0,     227328,     227328,     2048,     4096, 0x86aa3e3f
+0,     229376,     229376,     2048,     4096, 0xab5ae57d
+0,     231424,     231424,     2048,     4096, 0x291a91f3
+0,     233472,     233472,     2048,     4096, 0xfdf0dcfc
+0,     235520,     235520,     2048,     4096, 0x1ef91f67
+0,     237568,     237568,     2048,     4096, 0xc899efee
+0,     239616,     239616,     2048,     4096, 0x5ade15ac
+0,     241664,     241664,     2048,     4096, 0x04516beb
+0,     243712,     243712,     2048,     4096, 0xbf5ebbb9
+0,     245760,     245760,     2048,     4096, 0x4a235122
+0,     247808,     247808,     2048,     4096, 0xd7a3f4a6
+0,     249856,     249856,     2048,     4096, 0x5f900f20
+0,     251904,     251904,     2048,     4096, 0xa90b4365
+0,     253952,     253952,     2048,     4096, 0x63149dc4
+0,     256000,     256000,     2048,     4096, 0xf12c1ee8
+0,     258048,     258048,     2048,     4096, 0x6d0fec8c
+0,     260096,     260096,     2048,     4096, 0x65e07850
+0,     262144,     262144,     2048,     4096, 0x16d951cc
+0,     264192,     264192,     2048,     4096, 0xd296d0c4
+0,     266240,     266240,     2048,     4096, 0x619b2a53
+0,     268288,     268288,     2048,     4096, 0x316972d5
+0,     270336,     270336,     2048,     4096, 0xcfd64e21
+0,     272384,     272384,     2048,     4096, 0xcbcb10c6
+0,     274432,     274432,     2048,     4096, 0x20aeff7c
+0,     276480,     276480,     2048,     4096, 0xd205dabd
+0,     278528,     278528,     2048,     4096, 0xac9d3001
+0,     280576,     280576,     2048,     4096, 0x6d53dfdd
+0,     282624,     282624,     2048,     4096, 0xbb9fe15c
+0,     284672,     284672,     2048,     4096, 0x1852b88b
+0,     286720,     286720,     2048,     4096, 0xb0acec01
+0,     288768,     288768,     2048,     4096, 0xb52a9342
+0,     290816,     290816,     2048,     4096, 0x7529faee
+0,     292864,     292864,     2048,     4096, 0x150ff449
+0,     294912,     294912,     2048,     4096, 0xa81d31d9
+0,     296960,     296960,     2048,     4096, 0xbcb8084a
+0,     299008,     299008,     2048,     4096, 0x07229514
+0,     301056,     301056,     2048,     4096, 0xa85cfd88
+0,     303104,     303104,     2048,     4096, 0x0aef9c27
+0,     305152,     305152,     2048,     4096, 0x8ec47b39
+0,     307200,     307200,     2048,     4096, 0x910b0560
+0,     309248,     309248,     2048,     4096, 0x99a8578e
+0,     311296,     311296,     2048,     4096, 0xb3df1d84
+0,     313344,     313344,     2048,     4096, 0x48e52559
+0,     315392,     315392,     2048,     4096, 0xb25c4800
+0,     317440,     317440,     2048,     4096, 0x913bc8ce
+0,     319488,     319488,     2048,     4096, 0xb736cc8c
+0,     321536,     321536,     2048,     4096, 0x13c66646
+0,     323584,     323584,     2048,     4096, 0x70a71221
+0,     325632,     325632,     2048,     4096, 0x3a50a08e
+0,     327680,     327680,     2048,     4096, 0xc0a037b0
+0,     329728,     329728,     2048,     4096, 0x9a789475
+0,     331776,     331776,     2048,     4096, 0xc890ca16
+0,     333824,     333824,     2048,     4096, 0xa0d34bed
+0,     335872,     335872,     2048,     4096, 0x1689fa60
+0,     337920,     337920,     2048,     4096, 0x5bac4c83
+0,     339968,     339968,      684,     1368, 0x904be5e5
diff --git a/tests/ref/fate/g722enc b/tests/ref/fate/g722enc
index c1094565b5..9b8e469a8b 100644
--- a/tests/ref/fate/g722enc
+++ b/tests/ref/fate/g722enc
@@ -1 +1 @@
-750269cc236541df28e15da5c7b0df7a
+94e2f200d6e05b47cec4aa3e94571cf3