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Server for the Echoprint audio fingerprint system

License: Apache License 2.0

CMake 0.22% Python 9.90% C 40.87% Shell 2.16% Java 46.86%

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echoprint-server's Issues

"test-rest.sh" referenced in the readme is not present in the repository

The file "test-rest.sh" mentioned in the readme, which should contain examples of using cURL to interact with the REST service isn't present anywhere in the repository. It would be nice if it could be added, or that reference removed to avoid future confusion.

Can't compile.

I'm attempting to install this repository's Python library through:

pip install git+https://github.com/spotify/echoprint-server.git

I receive this compiler error from gcc in return:

/usr/lib/python3.7/distutils/dist.py:274: UserWarning: Unknown distribution option: 'install_requires'
  warnings.warn(msg)
running install
running build
running build_py
running build_ext
building 'echoprint_server_c' extension
x86_64-linux-gnu-gcc -pthread -DNDEBUG -g -fwrapv -O2 -Wall -g -fstack-protector-strong -Wformat -Werror=format-security -Wdate-time -D_FORTIFY_SOURCE=2 -fPIC -I/home/kyleanthonywilliams2/Active/eee/env/include -I/usr/include/python3.7m -c libechoprintserver.c -o build/temp.linux-x86_64-3.7/libechoprintserver.o
libechoprintserver.c: In function ‘_load_echoprint_inverted_index_block’:
libechoprintserver.c:210:3: warning: ignoring return value of ‘fread’, declared with attribute warn_unused_result [-Wunused-result]
   fread(&(block->n_codes), sizeof(uint32_t), 1, fp);
   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
libechoprintserver.c:211:3: warning: ignoring return value of ‘fread’, declared with attribute warn_unused_result [-Wunused-result]
   fread(&(block->n_songs), sizeof(uint32_t), 1, fp);
   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
libechoprintserver.c:214:3: warning: ignoring return value of ‘fread’, declared with attribute warn_unused_result [-Wunused-result]
   fread(block->codes, sizeof(uint32_t), block->n_codes, fp);
   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
libechoprintserver.c:216:3: warning: ignoring return value of ‘fread’, declared with attribute warn_unused_result [-Wunused-result]
   fread(block->code_lengths, sizeof(uint32_t), block->n_codes, fp);
   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
libechoprintserver.c:218:3: warning: ignoring return value of ‘fread’, declared with attribute warn_unused_result [-Wunused-result]
   fread(block->song_lengths, sizeof(uint32_t), block->n_songs, fp);
   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
libechoprintserver.c:225:3: warning: ignoring return value of ‘fread’, declared with attribute warn_unused_result [-Wunused-result]
   fread(block->song_indices, sizeof(uint16_t), n_tot_song_indices, fp);
   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
libechoprintserver.c: In function ‘echoprint_inverted_index_block_similarity’:
libechoprintserver.c:100:11: warning: ‘den’ may be used uninitialized in this function [-Wmaybe-uninitialized]
     float den;
           ^~~
x86_64-linux-gnu-gcc -pthread -DNDEBUG -g -fwrapv -O2 -Wall -g -fstack-protector-strong -Wformat -Werror=format-security -Wdate-time -D_FORTIFY_SOURCE=2 -fPIC -I/home/kyleanthonywilliams2/Active/eee/env/include -I/usr/include/python3.7m -c echoprint_server_python.c -o build/temp.linux-x86_64-3.7/echoprint_server_python.o
echoprint_server_python.c: In function ‘initechoprint_server_c’:
echoprint_server_python.c:63:17: warning: implicit declaration of function ‘Py_InitModule3’; did you mean ‘Py_Initialize’? [-Wimplicit-function-declaration]
   PyObject *m = Py_InitModule3(
                 ^~~~~~~~~~~~~~
                 Py_Initialize
echoprint_server_python.c:63:17: warning: initialization of ‘PyObject *’ {aka ‘struct _object *’} from ‘int’ makes pointer from integer without a cast [-Wint-conversion]
echoprint_server_python.c:66:5: warning: ‘return’ with no value, in function returning non-void
     return;
     ^~~~~~
echoprint_server_python.c:61:16: note: declared here
 PyMODINIT_FUNC initechoprint_server_c(void)
                ^~~~~~~~~~~~~~~~~~~~~~
echoprint_server_python.c: In function ‘echoprint_py_load_inverted_index’:
echoprint_server_python.c:97:9: warning: implicit declaration of function ‘PyString_Check’; did you mean ‘PyMapping_Check’? [-Wimplicit-function-declaration]
     if(!PyString_Check(py_path))
         ^~~~~~~~~~~~~~
         PyMapping_Check
echoprint_server_python.c:102:27: warning: implicit declaration of function ‘PyString_AsString’; did you mean ‘PyBytes_AsString’? [-Wimplicit-function-declaration]
     index_file_paths[n] = PyString_AsString(
                           ^~~~~~~~~~~~~~~~~
                           PyBytes_AsString
echoprint_server_python.c:102:25: warning: assignment to ‘char *’ from ‘int’ makes pointer from integer without a cast [-Wint-conversion]
     index_file_paths[n] = PyString_AsString(
                         ^
echoprint_server_python.c: In function ‘echoprint_py_inverted_index_size’:
echoprint_server_python.c:129:10: warning: implicit declaration of function ‘PyInt_FromLong’; did you mean ‘PyLong_FromLong’? [-Wimplicit-function-declaration]
   return PyInt_FromLong((long) echoprint_inverted_index_get_n_songs(index));
          ^~~~~~~~~~~~~~
          PyLong_FromLong
echoprint_server_python.c:129:10: warning: returning ‘int’ from a function with return type ‘PyObject *’ {aka ‘struct _object *’} makes pointer from integer without a cast [-Wint-conversion]
   return PyInt_FromLong((long) echoprint_inverted_index_get_n_songs(index));
          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
echoprint_server_python.c: In function ‘echoprint_py_query_inverted_index’:
echoprint_server_python.c:150:13: warning: passing argument 1 of ‘strcmp’ makes pointer from integer without a cast [-Wint-conversion]
   if(strcmp(PyString_AsString(arg_sim_fun), "jaccard") == 0)
             ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In file included from /usr/include/python3.7m/Python.h:30,
                 from echoprint_server_python.c:22:
/usr/include/string.h:136:32: note: expected ‘const char *’ but argument is of type ‘int’
 extern int strcmp (const char *__s1, const char *__s2)
                    ~~~~~~~~~~~~^~~~
echoprint_server_python.c:152:18: warning: passing argument 1 of ‘strcmp’ makes pointer from integer without a cast [-Wint-conversion]
   else if(strcmp(PyString_AsString(arg_sim_fun), "set_int") == 0)
                  ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In file included from /usr/include/python3.7m/Python.h:30,
                 from echoprint_server_python.c:22:
/usr/include/string.h:136:32: note: expected ‘const char *’ but argument is of type ‘int’
 extern int strcmp (const char *__s1, const char *__s2)
                    ~~~~~~~~~~~~^~~~
echoprint_server_python.c:154:18: warning: passing argument 1 of ‘strcmp’ makes pointer from integer without a cast [-Wint-conversion]
   else if(strcmp(PyString_AsString(arg_sim_fun),
                  ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In file included from /usr/include/python3.7m/Python.h:30,
                 from echoprint_server_python.c:22:
/usr/include/string.h:136:32: note: expected ‘const char *’ but argument is of type ‘int’
 extern int strcmp (const char *__s1, const char *__s2)
                    ~~~~~~~~~~~~^~~~
echoprint_server_python.c:177:9: warning: implicit declaration of function ‘PyInt_Check’; did you mean ‘PySet_Check’? [-Wimplicit-function-declaration]
     if(!PyInt_Check(code_obj))
         ^~~~~~~~~~~
         PySet_Check
echoprint_server_python.c:185:23: warning: implicit declaration of function ‘PyInt_AsLong’; did you mean ‘PyLong_AsLong’? [-Wimplicit-function-declaration]
     code = (uint32_t) PyInt_AsLong(code_obj);
                       ^~~~~~~~~~~~
                       PyLong_AsLong
echoprint_server_python.c:201:5: error: unknown type name ‘PyStringObject’; did you mean ‘PySliceObject’?
     PyStringObject* score_k = (PyStringObject*)PyString_FromString("score");
     ^~~~~~~~~~~~~~
     PySliceObject
echoprint_server_python.c:201:32: error: ‘PyStringObject’ undeclared (first use in this function); did you mean ‘PySliceObject’?
     PyStringObject* score_k = (PyStringObject*)PyString_FromString("score");
                                ^~~~~~~~~~~~~~
                                PySliceObject
echoprint_server_python.c:201:32: note: each undeclared identifier is reported only once for each function it appears in
echoprint_server_python.c:201:47: error: expected expression before ‘)’ token
     PyStringObject* score_k = (PyStringObject*)PyString_FromString("score");
                                               ^
echoprint_server_python.c:206:21: error: ‘index_k’ undeclared (first use in this function); did you mean ‘index’?
     PyStringObject* index_k = (PyStringObject*)PyString_FromString("index");
                     ^~~~~~~
                     index
echoprint_server_python.c:206:47: error: expected expression before ‘)’ token
     PyStringObject* index_k = (PyStringObject*)PyString_FromString("index");
                                               ^
echoprint_server_python.c:207:5: error: unknown type name ‘PyIntObject’; did you mean ‘PySetObject’?
     PyIntObject* index_v = (PyIntObject*)PyInt_FromLong((long) output_indices[n]);
     ^~~~~~~~~~~
     PySetObject
echoprint_server_python.c:207:29: error: ‘PyIntObject’ undeclared (first use in this function); did you mean ‘PySetObject’?
     PyIntObject* index_v = (PyIntObject*)PyInt_FromLong((long) output_indices[n]);
                             ^~~~~~~~~~~
                             PySetObject
echoprint_server_python.c:207:41: error: expected expression before ‘)’ token
     PyIntObject* index_v = (PyIntObject*)PyInt_FromLong((long) output_indices[n]);
                                         ^
echoprint_server_python.c: In function ‘echoprint_py_inverted_index_create_block’:
echoprint_server_python.c:245:12: warning: assignment to ‘char *’ from ‘int’ makes pointer from integer without a cast [-Wint-conversion]
   path_out = PyString_AsString(arg_output_path);
            ^
error: command 'x86_64-linux-gnu-gcc' failed with exit status 1

I'm on Python 3.7.3.

how product index.bin

hi, I don't know how to product index.bin. Is there anyone knows? Thanks very much.

memory leaks

Hi, i found some possible memory leak.

src: echoprint-server/libechoprintserver.c

Line 318:  out = (uint32_t *) malloc(sizeof(uint32_t) * out_len);
  i = 0;
  for(n = 0; n < n_sequences; n++)
  {
    uint32_t len_n = sequence_lengths[n];
    memcpy(out + i, sequences[n], sizeof(uint32_t) * len_n);
    i += len_n;
  }
  _sequence_to_set_inplace(out, &out_len);
  *output_length = out_len;
  *output = out;
}

==============================

**Line 345** **code_lengths** = (uint32_t *) malloc(sizeof(uint32_t) * n_codes);
  for(i = 0; i < n_codes; i++)
    code_lengths[i] = 0;
  for(i = 0; i < n_songs; i++)
  {
    int offset = 0;
    for(c = 0; c < song_lengths[i]; c++)
    {
      while(codes[offset] != songs_codes[i][c])
        offset++;
      code_lengths[offset]++;
    }
  }

  code_lengths_sum = 0;
  for(c = 0; c < n_codes; c++)
    code_lengths_sum += code_lengths[c];
  song_indices = (uint16_t *) malloc(
    sizeof(uint16_t) * code_lengths_sum);

  code_offsets = (uint32_t *) malloc(sizeof(uint32_t) * n_codes);
  code_offsets[0] = 0;
  for(c = 1; c < n_codes; c++)
    code_offsets[c] = code_offsets[c-1] + code_lengths[c-1];
  for(i = 0; i < n_songs; i++)
  {
    int offset = 0;
    for(c = 0; c < song_lengths[i]; c++)
    {
      uint32_t code = songs_codes[i][c];
      while(codes[offset] != code)
        offset++;
      song_indices[code_offsets[offset]] = i;
      code_offsets[offset]++;
    }
  }
  free(code_offsets);

Installation issue

Hi, I'm .net developer and I don't know much about python and java (just a week ability to read the code), I want to port this server side logic into C# and WCF, Can you explain a bit more about how to build the project? I have tried CMake to build C++ code but it gives error every time, In building the Python extension : error: command 'C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\BIN\link.exe' failed with exit status 1120 and ....
I want to ask you if you could explain a bit more about how to build the project step by step, Something like Codegen windows compilation instructions :
https://github.com/spotify/echoprint-codegen/tree/master/windows

Thanks

whether echoprint can identify different types of noise

Hello Dear

i hope to identify different types of noise via echoprint , whether echoprint can support for the goal？

                                          Best Regards

                                           Tiger hanfeng

QUESTION: How to compare Spotify json dump vs Echoprint MP3 dump

Hey,

I don't know if I'm correct here for asking, but I am struggling to figure this out. I have two dumps. Both are of the song "Blinding Lights" by "The Weeknd" for no particular reason other then testing.
One is of the MP3 I have on my computer, the other is from Spotify when I request the track echoprint data.
mp3.txt
spotify.txt

My question is, how can I use the dump from spotify to correctly identify the corresponding MP3 in my collection? I hope someone can push me in the right direction.

Thx in advance

./recog {filename} hello what you put in file name ?

fopen use rb / wb, not text r / w

Please change in libechoprintserver.c: fopen() with "rb", "wb", then it runs also
on Win ok.

there is a question, what can I do?

There are many of json file that use echoprint-decode to transfor in the folder ,
when I want to crate the index.bin, but not as you say index_001.bin,index002.bin .
-bash: /bin/cat: the parameter list is too long....

it means that the cat command receives parameter too much.and how you resolve?

echoprint-inverted-index gives error with piping large dump file to it

actually i wanted to test echoprint by its database : http://echoprint-data.s3.amazonaws.com/echoprint-dump-1.json
and i try to do this :
cat echoprint-dump-1.json|jq -r '.[].code' | echoprint-inverted-index index.bin
and it gives this error :
Traceback (most recent call last): File "/usr/local/bin/echoprint-inverted-index", line 19, in <module> create_inverted_index(streamer(sys.stdin), args.indexfile) File "/usr/local/lib/python2.7/dist-packages/echoprint_server/lib.py", line 57, in create_inverted_index for batch_index, batch in enumerate(split_seq(songs, 65535)): File "/usr/local/lib/python2.7/dist-packages/echoprint_server/lib.py", line 30, in split_seq item = list(itertools.islice(it, size)) File "/usr/local/lib/python2.7/dist-packages/echoprint_server/lib.py", line 78, in parsing_code_streamer yield decode_echoprint(line.strip())[1] File "/usr/local/lib/python2.7/dist-packages/echoprint_server/lib.py", line 42, in decode_echoprint unzipped = zlib.decompress(zipped) zlib.error: Error -5 while decompressing data: incomplete or truncated stream

i think it happens just when file is being larger , i tested it with small json files and it works.
any one encounter with this error ?
is this a bug or the problem is just mine ?

Python scripts not able to find C library

I installed the python extension module with

sudo python setup.py install

and echoprint-decode is working correct. But echoprint-inverted-index does not work, because it cannot find the C library. What am I doing wrong?

$ cat codes.txt | echoprint-inverted-index index.bin

Traceback (most recent call last):
  File "/usr/local/bin/echoprint-inverted-index", line 19, in <module>
    create_inverted_index(streamer(sys.stdin), args.indexfile)
  File "/home/sam/.local/lib/python2.7/site-packages/echoprint_server/lib.py", line 55, in create_inverted_index
    _create_index_block(list(batch), batch_output_path)
NameError: global name '_create_index_block' is not defined

Can you give some instruction how to install this stuff?

Error running setup.py

when running setup.py as instructed in the readme I am getting this:

/usr/lib/python3.8/distutils/dist.py:274: UserWarning: Unknown distribution option: 'install_requires'
  warnings.warn(msg)
running install
running build
running build_py
creating build
creating build/lib.linux-x86_64-3.8
creating build/lib.linux-x86_64-3.8/echoprint_server
copying echoprint_server/lib.py -> build/lib.linux-x86_64-3.8/echoprint_server
copying echoprint_server/__init__.py -> build/lib.linux-x86_64-3.8/echoprint_server
running build_ext
building 'echoprint_server_c' extension
creating build/temp.linux-x86_64-3.8
x86_64-linux-gnu-gcc -pthread -Wno-unused-result -Wsign-compare -DNDEBUG -g -fwrapv -O2 -Wall -g -fstack-protector-strong -Wformat -Werror=format-security -g -fwrapv -O2 -g -fstack-protector-strong -Wformat -Werror=format-security -Wdate-time -D_FORTIFY_SOURCE=2 -fPIC -I/usr/include/python3.8 -c libechoprintserver.c -o build/temp.linux-x86_64-3.8/libechoprintserver.o
libechoprintserver.c: In function ‘echoprint_inverted_index_block_similarity’:
libechoprintserver.c:64:14: warning: comparison of integer expressions of different signedness: ‘int’ and ‘uint32_t’ {aka ‘unsigned int’} [-Wsign-compare]
   64 |   for(n=0; n < index_block->n_songs; n++)
      |              ^
libechoprintserver.c:70:11: warning: comparison of integer expressions of different signedness: ‘int’ and ‘uint32_t’ {aka ‘unsigned int’} [-Wsign-compare]
   70 |   while(j < query_length && i < index_block->n_codes)
      |           ^
libechoprintserver.c:70:31: warning: comparison of integer expressions of different signedness: ‘int’ and ‘uint32_t’ {aka ‘unsigned int’} [-Wsign-compare]
   70 |   while(j < query_length && i < index_block->n_codes)
      |                               ^
libechoprintserver.c:77:20: warning: comparison of integer expressions of different signedness: ‘int’ and ‘uint32_t’ {aka ‘unsigned int’} [-Wsign-compare]
   77 |       for(n = 0; n < codeblock_length; n++)
      |                    ^
libechoprintserver.c:98:14: warning: comparison of integer expressions of different signedness: ‘int’ and ‘uint32_t’ {aka ‘unsigned int’} [-Wsign-compare]
   98 |   for(n=0; n < index_block->n_songs; n++)
      |              ^
libechoprintserver.c: In function ‘echoprint_inverted_index_query’:
libechoprintserver.c:159:16: warning: comparison of integer expressions of different signedness: ‘int’ and ‘uint32_t’ {aka ‘unsigned int’} [-Wsign-compare]
  159 |   for(b = 0; b < index->n_blocks; b++)
      |                ^
libechoprintserver.c:160:43: warning: comparison of integer expressions of different signedness: ‘int’ and ‘uint32_t’ {aka ‘unsigned int’} [-Wsign-compare]
  160 |     max_block_n_songs = max_block_n_songs > index->blocks[b].n_songs ?
      |                                           ^
libechoprintserver.c:161:7: warning: operand of ?: changes signedness from ‘int’ to ‘uint32_t’ {aka ‘unsigned int’} due to unsignedness of other operand [-Wsign-compare]
  161 |       max_block_n_songs : index->blocks[b].n_songs;
      |       ^~~~~~~~~~~~~~~~~
libechoprintserver.c:165:16: warning: comparison of integer expressions of different signedness: ‘int’ and ‘uint32_t’ {aka ‘unsigned int’} [-Wsign-compare]
  165 |   for(n = 0; n < n_results; n++)
      |                ^
libechoprintserver.c:174:16: warning: comparison of integer expressions of different signedness: ‘int’ and ‘uint32_t’ {aka ‘unsigned int’} [-Wsign-compare]
  174 |   for(b = 0; b < index->n_blocks; b++)
      |                ^
libechoprintserver.c:178:18: warning: comparison of integer expressions of different signedness: ‘int’ and ‘uint32_t’ {aka ‘unsigned int’} [-Wsign-compare]
  178 |     for(i = 0; i < index->blocks[b].n_songs; i++)
      |                  ^
libechoprintserver.c:183:18: warning: comparison of integer expressions of different signedness: ‘int’ and ‘uint32_t’ {aka ‘unsigned int’} [-Wsign-compare]
  183 |       if(ith_pos < n_results)
      |                  ^
libechoprintserver.c:195:16: warning: comparison of integer expressions of different signedness: ‘int’ and ‘uint32_t’ {aka ‘unsigned int’} [-Wsign-compare]
  195 |   for(n = 0; n < n_results; n++)
      |                ^
libechoprintserver.c: In function ‘_load_echoprint_inverted_index_block’:
libechoprintserver.c:221:16: warning: comparison of integer expressions of different signedness: ‘int’ and ‘uint32_t’ {aka ‘unsigned int’} [-Wsign-compare]
  221 |   for(n = 0; n < block->n_codes; n++)
      |                ^
libechoprintserver.c: In function ‘echoprint_inverted_index_free’:
libechoprintserver.c:254:16: warning: comparison of integer expressions of different signedness: ‘int’ and ‘uint32_t’ {aka ‘unsigned int’} [-Wsign-compare]
  254 |   for(n = 0; n < index->n_blocks; n++)
      |                ^
libechoprintserver.c: In function ‘echoprint_inverted_index_block_serialize’:
libechoprintserver.c:289:16: warning: comparison of integer expressions of different signedness: ‘int’ and ‘uint32_t’ {aka ‘unsigned int’} [-Wsign-compare]
  289 |   for(n = 0; n < block->n_codes; n++)
      |                ^
libechoprintserver.c: In function ‘echoprint_inverted_index_block_similarity’:
libechoprintserver.c:100:11: warning: ‘den’ may be used uninitialized in this function [-Wmaybe-uninitialized]
  100 |     float den;
      |           ^~~
x86_64-linux-gnu-gcc -pthread -Wno-unused-result -Wsign-compare -DNDEBUG -g -fwrapv -O2 -Wall -g -fstack-protector-strong -Wformat -Werror=format-security -g -fwrapv -O2 -g -fstack-protector-strong -Wformat -Werror=format-security -Wdate-time -D_FORTIFY_SOURCE=2 -fPIC -I/usr/include/python3.8 -c echoprint_server_python.c -o build/temp.linux-x86_64-3.8/echoprint_server_python.o
echoprint_server_python.c: In function ‘initechoprint_server_c’:
echoprint_server_python.c:63:17: warning: implicit declaration of function ‘Py_InitModule3’ [-Wimplicit-function-declaration]
   63 |   PyObject *m = Py_InitModule3(
      |                 ^~~~~~~~~~~~~~
echoprint_server_python.c:63:17: warning: initialization of ‘PyObject *’ {aka ‘struct _object *’} from ‘int’ makes pointer from integer without a cast [-Wint-conversion]
echoprint_server_python.c:66:5: warning: ‘return’ with no value, in function returning non-void [-Wreturn-type]
   66 |     return;
      |     ^~~~~~
echoprint_server_python.c:61:16: note: declared here
   61 | PyMODINIT_FUNC initechoprint_server_c(void)
      |                ^~~~~~~~~~~~~~~~~~~~~~
echoprint_server_python.c: In function ‘echoprint_py_load_inverted_index’:
echoprint_server_python.c:97:9: warning: implicit declaration of function ‘PyString_Check’; did you mean ‘PyMapping_Check’? [-Wimplicit-function-declaration]
   97 |     if(!PyString_Check(py_path))
      |         ^~~~~~~~~~~~~~
      |         PyMapping_Check
echoprint_server_python.c:102:27: warning: implicit declaration of function ‘PyString_AsString’ [-Wimplicit-function-declaration]
  102 |     index_file_paths[n] = PyString_AsString(
      |                           ^~~~~~~~~~~~~~~~~
echoprint_server_python.c:102:25: warning: assignment to ‘char *’ from ‘int’ makes pointer from integer without a cast [-Wint-conversion]
  102 |     index_file_paths[n] = PyString_AsString(
      |                         ^
echoprint_server_python.c: In function ‘echoprint_py_inverted_index_size’:
echoprint_server_python.c:129:10: warning: implicit declaration of function ‘PyInt_FromLong’; did you mean ‘PyLong_FromLong’? [-Wimplicit-function-declaration]
  129 |   return PyInt_FromLong((long) echoprint_inverted_index_get_n_songs(index));
      |          ^~~~~~~~~~~~~~
      |          PyLong_FromLong
echoprint_server_python.c:129:10: warning: returning ‘int’ from a function with return type ‘PyObject *’ {aka ‘struct _object *’} makes pointer from integer without a cast [-Wint-conversion]
  129 |   return PyInt_FromLong((long) echoprint_inverted_index_get_n_songs(index));
      |          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
echoprint_server_python.c: In function ‘echoprint_py_query_inverted_index’:
echoprint_server_python.c:150:13: warning: passing argument 1 of ‘strcmp’ makes pointer from integer without a cast [-Wint-conversion]
  150 |   if(strcmp(PyString_AsString(arg_sim_fun), "jaccard") == 0)
      |             ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
      |             |
      |             int
In file included from /usr/include/python3.8/Python.h:30,
                 from echoprint_server_python.c:22:
/usr/include/string.h:137:32: note: expected ‘const char *’ but argument is of type ‘int’
  137 | extern int strcmp (const char *__s1, const char *__s2)
      |                    ~~~~~~~~~~~~^~~~
echoprint_server_python.c:152:18: warning: passing argument 1 of ‘strcmp’ makes pointer from integer without a cast [-Wint-conversion]
  152 |   else if(strcmp(PyString_AsString(arg_sim_fun), "set_int") == 0)
      |                  ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
      |                  |
      |                  int
In file included from /usr/include/python3.8/Python.h:30,
                 from echoprint_server_python.c:22:
/usr/include/string.h:137:32: note: expected ‘const char *’ but argument is of type ‘int’
  137 | extern int strcmp (const char *__s1, const char *__s2)
      |                    ~~~~~~~~~~~~^~~~
echoprint_server_python.c:154:18: warning: passing argument 1 of ‘strcmp’ makes pointer from integer without a cast [-Wint-conversion]
  154 |   else if(strcmp(PyString_AsString(arg_sim_fun),
      |                  ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
      |                  |
      |                  int
In file included from /usr/include/python3.8/Python.h:30,
                 from echoprint_server_python.c:22:
/usr/include/string.h:137:32: note: expected ‘const char *’ but argument is of type ‘int’
  137 | extern int strcmp (const char *__s1, const char *__s2)
      |                    ~~~~~~~~~~~~^~~~
echoprint_server_python.c:177:9: warning: implicit declaration of function ‘PyInt_Check’; did you mean ‘PySet_Check’? [-Wimplicit-function-declaration]
  177 |     if(!PyInt_Check(code_obj))
      |         ^~~~~~~~~~~
      |         PySet_Check
echoprint_server_python.c:185:23: warning: implicit declaration of function ‘PyInt_AsLong’; did you mean ‘PyLong_AsLong’? [-Wimplicit-function-declaration]
  185 |     code = (uint32_t) PyInt_AsLong(code_obj);
      |                       ^~~~~~~~~~~~
      |                       PyLong_AsLong
echoprint_server_python.c:201:5: error: unknown type name ‘PyStringObject’; did you mean ‘PySliceObject’?
  201 |     PyStringObject* score_k = (PyStringObject*)PyString_FromString("score");
      |     ^~~~~~~~~~~~~~
      |     PySliceObject
echoprint_server_python.c:201:32: error: ‘PyStringObject’ undeclared (first use in this function); did you mean ‘PySliceObject’?
  201 |     PyStringObject* score_k = (PyStringObject*)PyString_FromString("score");
      |                                ^~~~~~~~~~~~~~
      |                                PySliceObject
echoprint_server_python.c:201:32: note: each undeclared identifier is reported only once for each function it appears in
echoprint_server_python.c:201:47: error: expected expression before ‘)’ token
  201 |     PyStringObject* score_k = (PyStringObject*)PyString_FromString("score");
      |                                               ^
echoprint_server_python.c:206:21: error: ‘index_k’ undeclared (first use in this function); did you mean ‘index’?
  206 |     PyStringObject* index_k = (PyStringObject*)PyString_FromString("index");
      |                     ^~~~~~~
      |                     index
echoprint_server_python.c:206:47: error: expected expression before ‘)’ token
  206 |     PyStringObject* index_k = (PyStringObject*)PyString_FromString("index");
      |                                               ^
echoprint_server_python.c:207:5: error: unknown type name ‘PyIntObject’; did you mean ‘PySetObject’?
  207 |     PyIntObject* index_v = (PyIntObject*)PyInt_FromLong((long) output_indices[n]);
      |     ^~~~~~~~~~~
      |     PySetObject
echoprint_server_python.c:207:29: error: ‘PyIntObject’ undeclared (first use in this function); did you mean ‘PySetObject’?
  207 |     PyIntObject* index_v = (PyIntObject*)PyInt_FromLong((long) output_indices[n]);
      |                             ^~~~~~~~~~~
      |                             PySetObject
echoprint_server_python.c:207:41: error: expected expression before ‘)’ token
  207 |     PyIntObject* index_v = (PyIntObject*)PyInt_FromLong((long) output_indices[n]);
      |                                         ^
echoprint_server_python.c: In function ‘echoprint_py_inverted_index_create_block’:
echoprint_server_python.c:245:12: warning: assignment to ‘char *’ from ‘int’ makes pointer from integer without a cast [-Wint-conversion]
  245 |   path_out = PyString_AsString(arg_output_path);
      |            ^
echoprint_server_python.c:263:20: warning: comparison of integer expressions of different signedness: ‘int’ and ‘uint32_t’ {aka ‘unsigned int’} [-Wsign-compare]
  263 |       for(m = 0; m < song_length; m++)
      |                    ^
error: command 'x86_64-linux-gnu-gcc' failed with exit status 1

happens on ubuntu 20.04.3 - any Idea what could be wrong here?