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g722: Fix the QMF scaling

Browse Source 
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>
pull/3/merge
Martin Storsjö 13 years ago
parent 56bf24ad78
commit b087ce2bee
5 changed files with 176 additions and 176 deletions
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  1. 4
      libavcodec/g722dec.c
  2. 4
      libavcodec/g722enc.c
  3. 8
      tests/ref/acodec/g722
  4. 334
      tests/ref/fate/g722dec-1
  5. 2
      tests/ref/fate/g722enc

4
libavcodec/g722dec.c
Unescape View File

@ -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]));

4
libavcodec/g722enc.c
Unescape View File

@ -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,

8
tests/ref/acodec/g722
Unescape View File

@ -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

334
tests/ref/fate/g722dec-1
Unescape View File

@ -1,168 +1,168 @@
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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

2
tests/ref/fate/g722enc
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750269cc236541df28e15da5c7b0df7a
94e2f200d6e05b47cec4aa3e94571cf3

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