avformat/pcm: decrease delay when reading PCM streams.

  Thanks for the discussion. Here's the next version, now with /25 and removed
ff_log2().

  The blocksize of the PCM decoder is hard-coded. This creates
unnecessary delay when reading low-rate (<100Hz) streams. This creates
issues when multiplexing multiple streams, since other inputs are only
opened/read after a low-rate input block was completely read.

 This patch decreases the blocksize for low-rate inputs, so
approximately a block is read every 40ms. This decreases the startup
delay when multiplexing inputs with different rates.

Signed-off-by: Philipp M. Scholl <pscholl@bawue.de>
Reviewed-by: Paul B Mahol <onemda@gmail.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

2 files changed, 42 insertions, 42 deletions

diff --git a/tests/ref/seek/lavf-alaw b/tests/ref/seek/lavf-alaw
index 4b1f8fbc02..8d517fa2bb 100644
--- a/tests/ref/seek/lavf-alaw
+++ b/tests/ref/seek/lavf-alaw
@@ -1,53 +1,53 @@
-ret: 0         st: 0 flags:1 dts: 0.000000 pts: 0.000000 pos:      0 size:  1024
+ret: 0         st: 0 flags:1 dts: 0.000000 pts: 0.000000 pos:      0 size:   882
 ret: 0         st:-1 flags:0  ts:-1.000000
-ret: 0         st: 0 flags:1 dts: 0.000000 pts: 0.000000 pos:      0 size:  1024
+ret: 0         st: 0 flags:1 dts: 0.000000 pts: 0.000000 pos:      0 size:   882
 ret: 0         st:-1 flags:1  ts: 1.894167
-ret: 0         st: 0 flags:1 dts: 1.894150 pts: 1.894150 pos:  41766 size:  1024
+ret: 0         st: 0 flags:1 dts: 1.894150 pts: 1.894150 pos:  41766 size:   882
 ret: 0         st: 0 flags:0  ts: 0.788345
-ret: 0         st: 0 flags:1 dts: 0.788345 pts: 0.788345 pos:  17383 size:  1024
+ret: 0         st: 0 flags:1 dts: 0.788345 pts: 0.788345 pos:  17383 size:   882
 ret: 0         st: 0 flags:1  ts:-0.317506
-ret: 0         st: 0 flags:1 dts: 0.000000 pts: 0.000000 pos:      0 size:  1024
+ret: 0         st: 0 flags:1 dts: 0.000000 pts: 0.000000 pos:      0 size:   882
 ret: 0         st:-1 flags:0  ts: 2.576668
 ret:-EOF
 ret: 0         st:-1 flags:1  ts: 1.470835
-ret: 0         st: 0 flags:1 dts: 1.470839 pts: 1.470839 pos:  32432 size:  1024
+ret: 0         st: 0 flags:1 dts: 1.470839 pts: 1.470839 pos:  32432 size:   882
 ret: 0         st: 0 flags:0  ts: 0.364989
-ret: 0         st: 0 flags:1 dts: 0.364989 pts: 0.364989 pos:   8048 size:  1024
+ret: 0         st: 0 flags:1 dts: 0.364989 pts: 0.364989 pos:   8048 size:   882
 ret: 0         st: 0 flags:1  ts:-0.740816
-ret: 0         st: 0 flags:1 dts: 0.000000 pts: 0.000000 pos:      0 size:  1024
+ret: 0         st: 0 flags:1 dts: 0.000000 pts: 0.000000 pos:      0 size:   882
 ret: 0         st:-1 flags:0  ts: 2.153336
 ret:-EOF
 ret: 0         st:-1 flags:1  ts: 1.047503
-ret: 0         st: 0 flags:1 dts: 1.047483 pts: 1.047483 pos:  23097 size:  1024
+ret: 0         st: 0 flags:1 dts: 1.047483 pts: 1.047483 pos:  23097 size:   882
 ret: 0         st: 0 flags:0  ts:-0.058322
-ret: 0         st: 0 flags:1 dts: 0.000000 pts: 0.000000 pos:      0 size:  1024
+ret: 0         st: 0 flags:1 dts: 0.000000 pts: 0.000000 pos:      0 size:   882
 ret: 0         st: 0 flags:1  ts: 2.835828
 ret:-EOF
 ret: 0         st:-1 flags:0  ts: 1.730004
-ret: 0         st: 0 flags:1 dts: 1.730023 pts: 1.730023 pos:  38147 size:  1024
+ret: 0         st: 0 flags:1 dts: 1.730023 pts: 1.730023 pos:  38147 size:   882
 ret: 0         st:-1 flags:1  ts: 0.624171
-ret: 0         st: 0 flags:1 dts: 0.624172 pts: 0.624172 pos:  13763 size:  1024
+ret: 0         st: 0 flags:1 dts: 0.624172 pts: 0.624172 pos:  13763 size:   882
 ret: 0         st: 0 flags:0  ts:-0.481678
-ret: 0         st: 0 flags:1 dts: 0.000000 pts: 0.000000 pos:      0 size:  1024
+ret: 0         st: 0 flags:1 dts: 0.000000 pts: 0.000000 pos:      0 size:   882
 ret: 0         st: 0 flags:1  ts: 2.412517
 ret:-EOF
 ret: 0         st:-1 flags:0  ts: 1.306672
-ret: 0         st: 0 flags:1 dts: 1.306667 pts: 1.306667 pos:  28812 size:  1024
+ret: 0         st: 0 flags:1 dts: 1.306667 pts: 1.306667 pos:  28812 size:   882
 ret: 0         st:-1 flags:1  ts: 0.200839
-ret: 0         st: 0 flags:1 dts: 0.200816 pts: 0.200816 pos:   4428 size:  1024
+ret: 0         st: 0 flags:1 dts: 0.200816 pts: 0.200816 pos:   4428 size:   882
 ret: 0         st: 0 flags:0  ts:-0.904989
-ret: 0         st: 0 flags:1 dts: 0.000000 pts: 0.000000 pos:      0 size:  1024
+ret: 0         st: 0 flags:1 dts: 0.000000 pts: 0.000000 pos:      0 size:   882
 ret: 0         st: 0 flags:1  ts: 1.989161
 ret: 0         st: 0 flags:1 dts: 1.989161 pts: 1.989161 pos:  43861 size:   239
 ret: 0         st:-1 flags:0  ts: 0.883340
-ret: 0         st: 0 flags:1 dts: 0.883356 pts: 0.883356 pos:  19478 size:  1024
+ret: 0         st: 0 flags:1 dts: 0.883356 pts: 0.883356 pos:  19478 size:   882
 ret: 0         st:-1 flags:1  ts:-0.222493
-ret: 0         st: 0 flags:1 dts: 0.000000 pts: 0.000000 pos:      0 size:  1024
+ret: 0         st: 0 flags:1 dts: 0.000000 pts: 0.000000 pos:      0 size:   882
 ret: 0         st: 0 flags:0  ts: 2.671655
 ret:-EOF
 ret: 0         st: 0 flags:1  ts: 1.565850
-ret: 0         st: 0 flags:1 dts: 1.565850 pts: 1.565850 pos:  34527 size:  1024
+ret: 0         st: 0 flags:1 dts: 1.565850 pts: 1.565850 pos:  34527 size:   882
 ret: 0         st:-1 flags:0  ts: 0.460008
-ret: 0         st: 0 flags:1 dts: 0.460000 pts: 0.460000 pos:  10143 size:  1024
+ret: 0         st: 0 flags:1 dts: 0.460000 pts: 0.460000 pos:  10143 size:   882
 ret: 0         st:-1 flags:1  ts:-0.645825
-ret: 0         st: 0 flags:1 dts: 0.000000 pts: 0.000000 pos:      0 size:  1024
+ret: 0         st: 0 flags:1 dts: 0.000000 pts: 0.000000 pos:      0 size:   882
diff --git a/tests/ref/seek/lavf-mulaw b/tests/ref/seek/lavf-mulaw
index 4b1f8fbc02..8d517fa2bb 100644
--- a/tests/ref/seek/lavf-mulaw
+++ b/tests/ref/seek/lavf-mulaw
@@ -1,53 +1,53 @@
-ret: 0         st: 0 flags:1 dts: 0.000000 pts: 0.000000 pos:      0 size:  1024
+ret: 0         st: 0 flags:1 dts: 0.000000 pts: 0.000000 pos:      0 size:   882
 ret: 0         st:-1 flags:0  ts:-1.000000
-ret: 0         st: 0 flags:1 dts: 0.000000 pts: 0.000000 pos:      0 size:  1024
+ret: 0         st: 0 flags:1 dts: 0.000000 pts: 0.000000 pos:      0 size:   882
 ret: 0         st:-1 flags:1  ts: 1.894167
-ret: 0         st: 0 flags:1 dts: 1.894150 pts: 1.894150 pos:  41766 size:  1024
+ret: 0         st: 0 flags:1 dts: 1.894150 pts: 1.894150 pos:  41766 size:   882
 ret: 0         st: 0 flags:0  ts: 0.788345
-ret: 0         st: 0 flags:1 dts: 0.788345 pts: 0.788345 pos:  17383 size:  1024
+ret: 0         st: 0 flags:1 dts: 0.788345 pts: 0.788345 pos:  17383 size:   882
 ret: 0         st: 0 flags:1  ts:-0.317506
-ret: 0         st: 0 flags:1 dts: 0.000000 pts: 0.000000 pos:      0 size:  1024
+ret: 0         st: 0 flags:1 dts: 0.000000 pts: 0.000000 pos:      0 size:   882
 ret: 0         st:-1 flags:0  ts: 2.576668
 ret:-EOF
 ret: 0         st:-1 flags:1  ts: 1.470835
-ret: 0         st: 0 flags:1 dts: 1.470839 pts: 1.470839 pos:  32432 size:  1024
+ret: 0         st: 0 flags:1 dts: 1.470839 pts: 1.470839 pos:  32432 size:   882
 ret: 0         st: 0 flags:0  ts: 0.364989
-ret: 0         st: 0 flags:1 dts: 0.364989 pts: 0.364989 pos:   8048 size:  1024
+ret: 0         st: 0 flags:1 dts: 0.364989 pts: 0.364989 pos:   8048 size:   882
 ret: 0         st: 0 flags:1  ts:-0.740816
-ret: 0         st: 0 flags:1 dts: 0.000000 pts: 0.000000 pos:      0 size:  1024
+ret: 0         st: 0 flags:1 dts: 0.000000 pts: 0.000000 pos:      0 size:   882
 ret: 0         st:-1 flags:0  ts: 2.153336
 ret:-EOF
 ret: 0         st:-1 flags:1  ts: 1.047503
-ret: 0         st: 0 flags:1 dts: 1.047483 pts: 1.047483 pos:  23097 size:  1024
+ret: 0         st: 0 flags:1 dts: 1.047483 pts: 1.047483 pos:  23097 size:   882
 ret: 0         st: 0 flags:0  ts:-0.058322
-ret: 0         st: 0 flags:1 dts: 0.000000 pts: 0.000000 pos:      0 size:  1024
+ret: 0         st: 0 flags:1 dts: 0.000000 pts: 0.000000 pos:      0 size:   882
 ret: 0         st: 0 flags:1  ts: 2.835828
 ret:-EOF
 ret: 0         st:-1 flags:0  ts: 1.730004
-ret: 0         st: 0 flags:1 dts: 1.730023 pts: 1.730023 pos:  38147 size:  1024
+ret: 0         st: 0 flags:1 dts: 1.730023 pts: 1.730023 pos:  38147 size:   882
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-ret: 0         st: 0 flags:1 dts: 0.624172 pts: 0.624172 pos:  13763 size:  1024
+ret: 0         st: 0 flags:1 dts: 0.624172 pts: 0.624172 pos:  13763 size:   882
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-ret: 0         st: 0 flags:1 dts: 0.000000 pts: 0.000000 pos:      0 size:  1024
+ret: 0         st: 0 flags:1 dts: 0.000000 pts: 0.000000 pos:      0 size:   882
 ret: 0         st: 0 flags:1  ts: 2.412517
 ret:-EOF
 ret: 0         st:-1 flags:0  ts: 1.306672
-ret: 0         st: 0 flags:1 dts: 1.306667 pts: 1.306667 pos:  28812 size:  1024
+ret: 0         st: 0 flags:1 dts: 1.306667 pts: 1.306667 pos:  28812 size:   882
 ret: 0         st:-1 flags:1  ts: 0.200839
-ret: 0         st: 0 flags:1 dts: 0.200816 pts: 0.200816 pos:   4428 size:  1024
+ret: 0         st: 0 flags:1 dts: 0.200816 pts: 0.200816 pos:   4428 size:   882
 ret: 0         st: 0 flags:0  ts:-0.904989
-ret: 0         st: 0 flags:1 dts: 0.000000 pts: 0.000000 pos:      0 size:  1024
+ret: 0         st: 0 flags:1 dts: 0.000000 pts: 0.000000 pos:      0 size:   882
 ret: 0         st: 0 flags:1  ts: 1.989161
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 ret: 0         st:-1 flags:0  ts: 0.883340
-ret: 0         st: 0 flags:1 dts: 0.883356 pts: 0.883356 pos:  19478 size:  1024
+ret: 0         st: 0 flags:1 dts: 0.883356 pts: 0.883356 pos:  19478 size:   882
 ret: 0         st:-1 flags:1  ts:-0.222493
-ret: 0         st: 0 flags:1 dts: 0.000000 pts: 0.000000 pos:      0 size:  1024
+ret: 0         st: 0 flags:1 dts: 0.000000 pts: 0.000000 pos:      0 size:   882
 ret: 0         st: 0 flags:0  ts: 2.671655
 ret:-EOF
 ret: 0         st: 0 flags:1  ts: 1.565850
-ret: 0         st: 0 flags:1 dts: 1.565850 pts: 1.565850 pos:  34527 size:  1024
+ret: 0         st: 0 flags:1 dts: 1.565850 pts: 1.565850 pos:  34527 size:   882
 ret: 0         st:-1 flags:0  ts: 0.460008
-ret: 0         st: 0 flags:1 dts: 0.460000 pts: 0.460000 pos:  10143 size:  1024
+ret: 0         st: 0 flags:1 dts: 0.460000 pts: 0.460000 pos:  10143 size:   882
 ret: 0         st:-1 flags:1  ts:-0.645825
-ret: 0         st: 0 flags:1 dts: 0.000000 pts: 0.000000 pos:      0 size:  1024
+ret: 0         st: 0 flags:1 dts: 0.000000 pts: 0.000000 pos:      0 size:   882