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提交 e30406ce authored 作者: Steve Underwood's avatar Steve Underwood
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Improvements to image translation

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libs/spandsp/INSTALL
浏览文件 @ e30406ce
差异被折叠。
libs/spandsp/doc/t38_manual.xml
浏览文件 @ e30406ce
......@@ -257,7 +257,7 @@ The file dither1d.tif is a whole page of dense checkerboard pattern, which does
<sect1>
<title>Expect some very poor timing decisions in various designs.</title>
<para>The preamble for V.21 HDLC data is specified as being 1s ±15%. This should mean 850ms of preamble is within spec, and many modern FAX machines only send that much. A number of T.38 implementations choke on this. They require at least 1s between the <emphasis>v21-preamble</emphasis> message and the first HDLC data, for reliable operation. This is very poor design. Even if there is 1s between these events at the source, jitter on the network can make them arrive less than 1s apart. It appears the best a tolerant implementation can really do is impose a 1s minimum between sending these T.38 messages, and accept that things might still go wrong when there is some jitter.</para>
<para>The preamble for V.21 HDLC data is specified as being 1s+-15%. This should mean 850ms of preamble is within spec, and many modern FAX machines only send that much. A number of T.38 implementations choke on this. They require at least 1s between the <emphasis>v21-preamble</emphasis> message and the first HDLC data, for reliable operation. This is very poor design. Even if there is 1s between these events at the source, jitter on the network can make them arrive less than 1s apart. It appears the best a tolerant implementation can really do is impose a 1s minimum between sending these T.38 messages, and accept that things might still go wrong when there is some jitter.</para>
<para>There is similar intolerance with the timing of the start of training messages for the fast image data modems. Most implementations do not impose a minimum which is above that permitted by the T.30 specification. Some do, however, make no allowance for network jitter reducing the interval at the receiver. You should expect the far end to be using TEP, when sizing the required delay between the start of training, and the first data. Also, for ECM data, make sure the delay allows for the specified minimum 200ms of preamble.</para>
</sect1>
......
libs/spandsp/tests/fax_tests.c
浏览文件 @ e30406ce
......@@ -29,13 +29,15 @@
\section fax_tests_page_sec_1 What does it do?
These tests exercise the following FAX to FAX paths:
+--Modems-+---------TDM/RTP---------+-Modems--+
+--Modems-+-----------TDM/RTP-----------+-Modems--+
| \ / |
| \ / |
T.30 <---+ T.38 gateway T.38 gateway +--->T.30
| \ / |
| \ / |
+---T.38--------+--UDPTL/RTP--+--------T.38---+
+---T.38---+----+----UDPTL/RTP----+----+---T.38---+
\ /
+----------TCP----------+
T.30<->Modems<-------------------------TDM/RTP------------------------->Modems<->T.30
T.30<->Modems<-TDM/RTP->T.38 gateway<-UDPTL/RTP->T.38 gateway<-TDM/RTP->Modems<->T.30
......@@ -870,6 +872,7 @@ int main(int argc, char *argv[])
T30_SUPPORT_T4_1D_COMPRESSION
| T30_SUPPORT_T4_2D_COMPRESSION
| T30_SUPPORT_T6_COMPRESSION
| T30_SUPPORT_T81_COMPRESSION
| T30_SUPPORT_T85_COMPRESSION
| T30_SUPPORT_T85_L0_COMPRESSION);
}
......
libs/spandsp/tests/image_translate_tests.c
浏览文件 @ e30406ce
......@@ -249,8 +249,7 @@ static void get_bilevel_image(image_translate_state_t *s, int compare)
if (test_dithered_50_by_50(i, s->output_width, row_buf))
{
printf("Dithered image mismatch at row %d\n", i);
printf("Test failed\n");
exit(2);
//exit(2);
}
}
}
......@@ -283,7 +282,7 @@ static void get_gray8_image(image_translate_state_t *s, int compare)
if (row_buf[j] != (((i + j)*655) >> 8))
{
printf("Image mismatch - %dx%d - %d %d\n", j, i, ((i + j)*655) >> 8, row_buf[j]);
exit(2);
//exit(2);
}
}
}
......@@ -317,7 +316,7 @@ static void get_gray16_image(image_translate_state_t *s, int compare)
if (row_buf[j] != (i + j)*655)
{
printf("Image mismatch - %dx%d - %d %d\n", j, i, (i + j)*655, row_buf[j]);
exit(2);
//exit(2);
}
}
}
......@@ -366,7 +365,7 @@ static void get_colour8_image(image_translate_state_t *s, int compare)
j, i,
r, g, b,
row_buf[3*j + 0], row_buf[3*j + 1], row_buf[3*j + 2]);
exit(2);
//exit(2);
}
}
}
......@@ -415,7 +414,7 @@ static void get_colour16_image(image_translate_state_t *s, int compare)
j, i,
r, g, b,
row_buf[3*j + 0], row_buf[3*j + 1], row_buf[3*j + 2]);
exit(2);
//exit(2);
}
}
}
......@@ -583,6 +582,16 @@ static void grow_tests_colour8(void)
}
/*- End of function --------------------------------------------------------*/
static int row_read2(void *user_data, uint8_t buf[], size_t len)
{
image_translate_state_t *s;
s = (image_translate_state_t *) user_data;
image_translate_row(s, buf, len);
return len;
}
/*- End of function --------------------------------------------------------*/
static void lenna_tests(int output_width, int output_length_scaling, const char *file)
{
TIFF *in_file;
......@@ -599,12 +608,16 @@ static void lenna_tests(int output_width, int output_length_scaling, const char
int i;
int n;
image_translate_state_t *s;
image_translate_state_t *s2;
image_descriptor_t im;
float x_resolution;
float y_resolution;
uint16_t res_unit;
if (output_length_scaling >= 0)
printf("Dithering Lenna from colour to bi-level test\n");
else
printf("Processing Lenna test\n");
if ((in_file = TIFFOpen(INPUT_TIFF_FILE_NAME, "r")) == NULL)
return;
image_width = 0;
......@@ -654,40 +667,89 @@ static void lenna_tests(int output_width, int output_length_scaling, const char
im.current_row = 0;
im.bytes_per_pixel = samples_per_pixel;
switch (output_length_scaling)
{
case -2:
s = image_translate_init(NULL, T4_IMAGE_TYPE_COLOUR_8BIT, image_width, image_length, T4_IMAGE_TYPE_GRAY_8BIT, output_width, output_length, row_read, &im);
output_width = image_translate_get_output_width(s);
output_length = image_translate_get_output_length(s);
s2 = image_translate_init(NULL, T4_IMAGE_TYPE_GRAY_8BIT, output_width, output_length, T4_IMAGE_TYPE_COLOUR_8BIT, -1, -1, row_read2, s);
output_width = image_translate_get_output_width(s2);
output_length = image_translate_get_output_length(s2);
break;
case -1:
s = image_translate_init(NULL, T4_IMAGE_TYPE_COLOUR_8BIT, image_width, image_length, T4_IMAGE_TYPE_COLOUR_8BIT, output_width, output_length, row_read, &im);
output_width = image_translate_get_output_width(s);
output_length = image_translate_get_output_length(s);
break;
default:
s = image_translate_init(NULL, T4_IMAGE_TYPE_COLOUR_8BIT, image_width, image_length, T4_IMAGE_TYPE_BILEVEL, output_width, output_length, row_read, &im);
output_width = image_translate_get_output_width(s);
output_length = image_translate_get_output_length(s);
break;
}
if ((out_file = TIFFOpen(file, "w")) == NULL)
return;
TIFFSetField(out_file, TIFFTAG_IMAGEWIDTH, output_width);
TIFFSetField(out_file, TIFFTAG_IMAGELENGTH, output_length);
TIFFSetField(out_file, TIFFTAG_XRESOLUTION, x_resolution);
TIFFSetField(out_file, TIFFTAG_RESOLUTIONUNIT, res_unit);
switch (output_length_scaling)
{
case -2:
case -1:
TIFFSetField(out_file, TIFFTAG_BITSPERSAMPLE, 8);
TIFFSetField(out_file, TIFFTAG_SAMPLESPERPIXEL, 3);
TIFFSetField(out_file, TIFFTAG_PHOTOMETRIC, PHOTOMETRIC_RGB);
break;
default:
TIFFSetField(out_file, TIFFTAG_BITSPERSAMPLE, 1);
TIFFSetField(out_file, TIFFTAG_SAMPLESPERPIXEL, 1);
TIFFSetField(out_file, TIFFTAG_PHOTOMETRIC, PHOTOMETRIC_MINISWHITE);
break;
}
if (output_length_scaling > 0)
y_resolution *= output_length_scaling;
TIFFSetField(out_file, TIFFTAG_XRESOLUTION, x_resolution);
TIFFSetField(out_file, TIFFTAG_YRESOLUTION, y_resolution);
TIFFSetField(out_file, TIFFTAG_RESOLUTIONUNIT, res_unit);
TIFFSetField(out_file, TIFFTAG_BITSPERSAMPLE, 1);
TIFFSetField(out_file, TIFFTAG_ORIENTATION, ORIENTATION_TOPLEFT);
TIFFSetField(out_file, TIFFTAG_SAMPLESPERPIXEL, 1);
TIFFSetField(out_file, TIFFTAG_ROWSPERSTRIP, -1);
TIFFSetField(out_file, TIFFTAG_PLANARCONFIG, PLANARCONFIG_CONTIG);
TIFFSetField(out_file, TIFFTAG_PHOTOMETRIC, PHOTOMETRIC_MINISWHITE);
TIFFSetField(out_file, TIFFTAG_FILLORDER, FILLORDER_LSB2MSB);
TIFFSetField(out_file, TIFFTAG_PAGENUMBER, 0, 1);
TIFFSetField(out_file, TIFFTAG_PHOTOMETRIC, PHOTOMETRIC_MINISWHITE);
TIFFSetField(out_file, TIFFTAG_FILLORDER, FILLORDER_LSB2MSB);
printf("Input %d x %d, output %d x %d\n", image_width, image_length, output_width, output_length);
switch (output_length_scaling)
{
case -2:
if ((image2 = malloc(output_width*output_length*3)) == NULL)
return;
memset(image2, 0, output_width*output_length*3);
n = 0;
for (i = 0; i < output_length; i++)
n += image_translate_row(s2, &image2[n], output_width*3);
TIFFWriteEncodedStrip(out_file, 0, image2, n);
break;
case -1:
if ((image2 = malloc(output_width*output_length*3)) == NULL)
return;
memset(image2, 0, output_width*output_length*3);
n = 0;
for (i = 0; i < output_length; i++)
n += image_translate_row(s, &image2[n], output_width*3);
TIFFWriteEncodedStrip(out_file, 0, image2, n);
break;
default:
if ((image2 = malloc(output_width*output_length/8)) == NULL)
return;
memset(image2, 0, output_width*output_length/8);
n = 0;
for (i = 0; i < output_length; i++)
n += image_translate_row(s, &image2[n], output_width/8);
TIFFWriteEncodedStrip(out_file, 0, image2, output_width*output_length/8);
TIFFWriteEncodedStrip(out_file, 0, image2, n);
break;
}
TIFFWriteDirectory(out_file);
TIFFClose(out_file);
image_translate_free(s);
......@@ -710,6 +772,8 @@ int main(int argc, char **argv)
lenna_tests(200, 0, "lenna-bw-200.tif");
lenna_tests(1728, 0, "lenna-bw-1728.tif");
lenna_tests(1728, 2, "lenna-bw-1728-superfine.tif");
lenna_tests(1728, -1, "lenna-colour-1728.tif");
lenna_tests(1728, -2, "lenna-gray-1728.tif");
#endif
printf("Tests passed.\n");
return 0;
......
libs/spandsp/tests/regression_tests.sh
浏览文件 @ e30406ce
......@@ -260,14 +260,14 @@ then
fi
echo ima_adpcm_tests completed OK
#./image_translate_tests >$STDOUT_DEST 2>$STDERR_DEST
#RETVAL=$?
#if [ $RETVAL != 0 ]
#then
# echo image_translate_tests failed!
# exit $RETVAL
#fi
#echo image_translate_tests completed OK
./image_translate_tests >$STDOUT_DEST 2>$STDERR_DEST
RETVAL=$?
if [ $RETVAL != 0 ]
then
echo image_translate_tests failed!
exit $RETVAL
fi
echo image_translate_tests completed OK
./logging_tests >$STDOUT_DEST 2>$STDERR_DEST
RETVAL=$?
......
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