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Home Page: https://cloud.r-project.org/package=aws.polly
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Character Limit
It seems that 1500 characters is the maximum limit for Polly. Do you think it's appropriate to catch this potential error in get_synthesis()?
List all languages, including codes
Please specify whether your issue is about:
- a possible bug
- a question about package functionality
- a suggested code or documentation change, improvement to the code, or feature request
If you set LanguageCode = NULL and do not have it in the query, then it can list all voices and the language codes.
The current aws.polly:
library(aws.polly)
list_voices(language = NULL)
#> Warning in structure(out[["Voices"]], NextToken = out[["NextToken"]]): Calling 'structure(NULL, *)' is deprecated, as NULL cannot have attributes.
#> Consider 'structure(list(), *)' instead.
#> list()
devtools::session_info()
#> ─ Session info ──────────────────────────────────────────────────────────
#> setting value
#> version R version 3.5.1 (2018-07-02)
#> os macOS Sierra 10.12.6
#> system x86_64, darwin15.6.0
#> ui X11
#> language (EN)
#> collate en_US.UTF-8
#> ctype en_US.UTF-8
#> tz America/New_York
#> date 2018-11-14
#>
#> ─ Packages ──────────────────────────────────────────────────────────────
#> package * version date lib source
#> assertthat 0.2.0 2017-04-11 [1] CRAN (R 3.5.0)
#> aws.polly * 0.1.2 2016-12-08 [1] CRAN (R 3.5.0)
#> aws.signature 0.4.4 2018-07-27 [1] CRAN (R 3.5.0)
#> backports 1.1.2 2017-12-13 [1] CRAN (R 3.5.0)
#> base64enc 0.1-3 2015-07-28 [1] CRAN (R 3.5.0)
#> callr 3.0.0 2018-08-24 [1] CRAN (R 3.5.0)
#> cli 1.0.1 2018-09-25 [1] CRAN (R 3.5.0)
#> crayon 1.3.4 2017-09-16 [1] CRAN (R 3.5.0)
#> curl 3.2 2018-03-28 [1] CRAN (R 3.5.0)
#> debugme 1.1.0 2017-10-22 [1] CRAN (R 3.5.0)
#> desc 1.2.0 2018-10-06 [1] local
#> devtools 2.0.1 2018-10-26 [1] CRAN (R 3.5.1)
#> digest 0.6.18 2018-10-10 [1] CRAN (R 3.5.0)
#> evaluate 0.12 2018-10-09 [1] CRAN (R 3.5.0)
#> fs 1.2.6 2018-08-23 [1] CRAN (R 3.5.0)
#> glue 1.3.0 2018-07-17 [1] CRAN (R 3.5.0)
#> htmltools 0.3.6 2017-04-28 [1] CRAN (R 3.5.0)
#> httr 1.3.1 2017-08-20 [1] CRAN (R 3.5.0)
#> jsonlite 1.5 2017-06-01 [1] CRAN (R 3.5.0)
#> knitr 1.20 2018-09-21 [1] Github (yihui/knitr@0da648b)
#> magrittr 1.5 2014-11-22 [1] CRAN (R 3.5.0)
#> MASS 7.3-51 2018-10-16 [1] CRAN (R 3.5.0)
#> memoise 1.1.0 2017-04-21 [1] CRAN (R 3.5.0)
#> pkgbuild 1.0.2 2018-10-16 [1] CRAN (R 3.5.0)
#> pkgload 1.0.2 2018-10-29 [1] CRAN (R 3.5.1)
#> prettyunits 1.0.2 2015-07-13 [1] CRAN (R 3.5.0)
#> processx 3.2.0.9000 2018-11-13 [1] Github (r-lib/processx@8374340)
#> ps 1.2.1 2018-11-06 [1] CRAN (R 3.5.0)
#> R6 2.3.0 2018-10-04 [1] CRAN (R 3.5.0)
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#> remotes 2.0.2 2018-10-30 [1] CRAN (R 3.5.0)
#> rlang 0.3.0.1 2018-10-25 [1] CRAN (R 3.5.0)
#> rmarkdown 1.10 2018-06-11 [1] CRAN (R 3.5.0)
#> rprojroot 1.3-2 2018-01-03 [1] CRAN (R 3.5.0)
#> sessioninfo 1.1.1 2018-11-05 [1] CRAN (R 3.5.0)
#> signal 0.7-6 2015-07-30 [1] CRAN (R 3.5.0)
#> stringi 1.2.4 2018-07-20 [1] CRAN (R 3.5.0)
#> stringr 1.3.1 2018-05-10 [1] CRAN (R 3.5.0)
#> testthat 2.0.1 2018-10-13 [1] CRAN (R 3.5.0)
#> tuneR 1.3.3 2018-07-08 [1] CRAN (R 3.5.0)
#> usethis 1.4.0.9000 2018-11-13 [1] local
#> withr 2.1.2 2018-03-15 [1] CRAN (R 3.5.0)
#> yaml 2.2.0 2018-07-25 [1] CRAN (R 3.5.0)
#>
#> [1] /Library/Frameworks/R.framework/Versions/3.5/Resources/libraryCreated on 2018-11-14 by the reprex package (v0.2.1)
** After Restarting R **
Preposed aws.polly PR:
devtools::install_github("muschellij2/aws.polly")
#> Downloading GitHub repo muschellij2/aws.polly@master
#>
#>
checking for file ‘/private/var/folders/1s/wrtqcpxn685_zk570bnx9_rr0000gr/T/RtmpS2hX2w/remotesa20042e9593f/muschellij2-aws.polly-ac3de83/DESCRIPTION’ ...
✔ checking for file ‘/private/var/folders/1s/wrtqcpxn685_zk570bnx9_rr0000gr/T/RtmpS2hX2w/remotesa20042e9593f/muschellij2-aws.polly-ac3de83/DESCRIPTION’
#>
─ preparing ‘aws.polly’:
#>
checking DESCRIPTION meta-information ...
✔ checking DESCRIPTION meta-information
#>
─ checking for LF line-endings in source and make files and shell scripts
#>
─ checking for empty or unneeded directories
#>
─ building ‘aws.polly_0.1.5.tar.gz’
#>
#>
library(aws.polly)
list_voices(language = NULL)
#> AdditionalLanguageCodes Gender Id LanguageCode
#> 1 NULL Female Filiz tr-TR
#> 2 NULL Female Astrid sv-SE
#> 3 NULL Female Tatyana ru-RU
#> 4 NULL Male Maxim ru-RU
#> 5 NULL Female Carmen ro-RO
#> 6 NULL Female Ines pt-PT
#> 7 NULL Male Cristiano pt-PT
#> 8 NULL Female Vitoria pt-BR
#> 9 NULL Male Ricardo pt-BR
#> 10 NULL Female Maja pl-PL
#> 11 NULL Male Jan pl-PL
#> 12 NULL Male Jacek pl-PL
#> 13 NULL Female Ewa pl-PL
#> 14 NULL Male Ruben nl-NL
#> 15 NULL Female Lotte nl-NL
#> 16 NULL Female Liv nb-NO
#> 17 NULL Female Seoyeon ko-KR
#> 18 NULL Male Takumi ja-JP
#> 19 NULL Female Mizuki ja-JP
#> 20 NULL Male Giorgio it-IT
#> 21 NULL Female Carla it-IT
#> 22 NULL Female Bianca it-IT
#> 23 NULL Male Karl is-IS
#> 24 NULL Female Dora is-IS
#> 25 NULL Male Mathieu fr-FR
#> 26 NULL Female Lea fr-FR
#> 27 NULL Female Celine fr-FR
#> 28 NULL Female Chantal fr-CA
#> 29 NULL Female Penelope es-US
#> 30 NULL Male Miguel es-US
#> 31 NULL Female Mia es-MX
#> 32 NULL Female Lucia es-ES
#> 33 NULL Male Enrique es-ES
#> 34 NULL Female Conchita es-ES
#> 35 NULL Male Geraint en-GB-WLS
#> 36 NULL Female Salli en-US
#> 37 NULL Male Matthew en-US
#> 38 NULL Female Kimberly en-US
#> 39 NULL Female Kendra en-US
#> 40 NULL Male Justin en-US
#> 41 NULL Male Joey en-US
#> 42 NULL Female Joanna en-US
#> 43 NULL Female Ivy en-US
#> 44 NULL Female Raveena en-IN
#> 45 hi-IN Female Aditi en-IN
#> 46 NULL Female Emma en-GB
#> 47 NULL Male Brian en-GB
#> 48 NULL Female Amy en-GB
#> 49 NULL Male Russell en-AU
#> 50 NULL Female Nicole en-AU
#> 51 NULL Female Vicki de-DE
#> 52 NULL Female Marlene de-DE
#> 53 NULL Male Hans de-DE
#> 54 NULL Female Naja da-DK
#> 55 NULL Male Mads da-DK
#> 56 NULL Female Gwyneth cy-GB
#> 57 NULL Female Zhiyu cmn-CN
#> LanguageName Name
#> 1 Turkish Filiz
#> 2 Swedish Astrid
#> 3 Russian Tatyana
#> 4 Russian Maxim
#> 5 Romanian Carmen
#> 6 Portuguese Inês
#> 7 Portuguese Cristiano
#> 8 Brazilian Portuguese Vitória
#> 9 Brazilian Portuguese Ricardo
#> 10 Polish Maja
#> 11 Polish Jan
#> 12 Polish Jacek
#> 13 Polish Ewa
#> 14 Dutch Ruben
#> 15 Dutch Lotte
#> 16 Norwegian Liv
#> 17 Korean Seoyeon
#> 18 Japanese Takumi
#> 19 Japanese Mizuki
#> 20 Italian Giorgio
#> 21 Italian Carla
#> 22 Italian Bianca
#> 23 Icelandic Karl
#> 24 Icelandic Dóra
#> 25 French Mathieu
#> 26 French Léa
#> 27 French Céline
#> 28 Canadian French Chantal
#> 29 US Spanish Penélope
#> 30 US Spanish Miguel
#> 31 Mexican Spanish Mia
#> 32 Castilian Spanish Lucia
#> 33 Castilian Spanish Enrique
#> 34 Castilian Spanish Conchita
#> 35 Welsh English Geraint
#> 36 US English Salli
#> 37 US English Matthew
#> 38 US English Kimberly
#> 39 US English Kendra
#> 40 US English Justin
#> 41 US English Joey
#> 42 US English Joanna
#> 43 US English Ivy
#> 44 Indian English Raveena
#> 45 Indian English Aditi
#> 46 British English Emma
#> 47 British English Brian
#> 48 British English Amy
#> 49 Australian English Russell
#> 50 Australian English Nicole
#> 51 German Vicki
#> 52 German Marlene
#> 53 German Hans
#> 54 Danish Naja
#> 55 Danish Mads
#> 56 Welsh Gwyneth
#> 57 Chinese Mandarin Zhiyu
devtools::session_info()
#> ─ Session info ──────────────────────────────────────────────────────────
#> setting value
#> version R version 3.5.1 (2018-07-02)
#> os macOS Sierra 10.12.6
#> system x86_64, darwin15.6.0
#> ui X11
#> language (EN)
#> collate en_US.UTF-8
#> ctype en_US.UTF-8
#> tz America/New_York
#> date 2018-11-14
#>
#> ─ Packages ──────────────────────────────────────────────────────────────
#> package * version date lib
#> assertthat 0.2.0 2017-04-11 [1]
#> aws.polly * 0.1.5 2018-11-14 [1]
#> aws.signature 0.4.4 2018-07-27 [1]
#> backports 1.1.2 2017-12-13 [1]
#> base64enc 0.1-3 2015-07-28 [1]
#> bit 1.1-14 2018-05-29 [1]
#> bit64 0.9-7 2017-05-08 [1]
#> blob 1.1.1 2018-03-25 [1]
#> callr 3.0.0 2018-08-24 [1]
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#> cranlike 1.0.1 2017-08-03 [1]
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#> DBI 1.0.0 2018-05-02 [1]
#> debugme 1.1.0 2017-10-22 [1]
#> desc 1.2.0 2018-10-06 [1]
#> devtools 2.0.1 2018-10-26 [1]
#> digest 0.6.18 2018-10-10 [1]
#> evaluate 0.12 2018-10-09 [1]
#> fs 1.2.6 2018-08-23 [1]
#> glue 1.3.0 2018-07-17 [1]
#> htmltools 0.3.6 2017-04-28 [1]
#> httr 1.3.1 2017-08-20 [1]
#> jsonlite 1.5 2017-06-01 [1]
#> knitr 1.20 2018-09-21 [1]
#> magrittr 1.5 2014-11-22 [1]
#> MASS 7.3-51 2018-10-16 [1]
#> memoise 1.1.0 2017-04-21 [1]
#> parsedate 1.1.3 2017-03-02 [1]
#> pkgbuild 1.0.2 2018-10-16 [1]
#> pkgload 1.0.2 2018-10-29 [1]
#> prettyunits 1.0.2 2015-07-13 [1]
#> processx 3.2.0.9000 2018-11-13 [1]
#> ps 1.2.1 2018-11-06 [1]
#> R6 2.3.0 2018-10-04 [1]
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#> Rcpp 0.12.19 2018-10-01 [1]
#> remotes 2.0.2 2018-10-30 [1]
#> rlang 0.3.0.1 2018-10-25 [1]
#> rmarkdown 1.10 2018-06-11 [1]
#> rprojroot 1.3-2 2018-01-03 [1]
#> RSQLite 2.1.1 2018-05-06 [1]
#> sessioninfo 1.1.1 2018-11-05 [1]
#> signal 0.7-6 2015-07-30 [1]
#> stringi 1.2.4 2018-07-20 [1]
#> stringr 1.3.1 2018-05-10 [1]
#> testthat 2.0.1 2018-10-13 [1]
#> tuneR 1.3.3 2018-07-08 [1]
#> usethis 1.4.0.9000 2018-11-13 [1]
#> withr 2.1.2 2018-03-15 [1]
#> yaml 2.2.0 2018-07-25 [1]
#> source
#> CRAN (R 3.5.0)
#> Github (muschellij2/aws.polly@ac3de83)
#> CRAN (R 3.5.0)
#> CRAN (R 3.5.0)
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#> CRAN (R 3.5.0)
#> Github (r-lib/crancache@11e6bde)
#> CRAN (R 3.5.0)
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#> local
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#> CRAN (R 3.5.0)
#> CRAN (R 3.5.0)
#> Github (yihui/knitr@0da648b)
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#> Github (r-lib/processx@8374340)
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#> [1] /Library/Frameworks/R.framework/Versions/3.5/Resources/libraryCreated on 2018-11-14 by the reprex package (v0.2.1)
Can't read in PCM from AWS
Please specify whether your issue is about:
- a possible bug
- a question about package functionality
- a suggested code or documentation change, improvement to the code, or feature request
Can't read in the PCM from AWS in tuneR:
library(aws.polly)
library(text2speech)
library(tuneR)
res = get_synthesis("hey it's John", voice = "Joanna", format = "pcm", rate = 16000)
tmp_pcm = tempfile(fileext = ".pcm")
writeBin(res, tmp_pcm)
tuneR::readWave(tmp_pcm)
#> Error in readChar(con, 4): invalid UTF-8 input in readChar()
The pcm_to_wav conversion function I made https://github.com/muschellij2/text2speech/blob/master/R/pcm_to_wav.R may be useful. Not sure if this package, but may be worthwhile for others if not incorporated here:
# https://github.com/muschellij2/text2speech/blob/master/R/pcm_to_wav.R
tmp_wav = pcm_to_wav(tmp_pcm)
tuneR::readWave(tmp_wav)
#>
#> Wave Object
#> Number of Samples: 14111
#> Duration (seconds): 0.88
#> Samplingrate (Hertz): 16000
#> Channels (Mono/Stereo): Mono
#> PCM (integer format): TRUE
#> Bit (8/16/24/32/64): 16Created on 2019-08-14 by the reprex package (v0.3.0)
Session info
devtools::session_info()
#> ─ Session info ──────────────────────────────────────────────────────────
#> setting value
#> version R version 3.6.0 (2019-04-26)
#> os macOS Mojave 10.14.6
#> system x86_64, darwin15.6.0
#> ui X11
#> language (EN)
#> collate en_US.UTF-8
#> ctype en_US.UTF-8
#> tz America/New_York
#> date 2019-08-14
#>
#> ─ Packages ──────────────────────────────────────────────────────────────
#> package * version date lib source
#> assertthat 0.2.1 2019-03-21 [1] CRAN (R 3.6.0)
#> aws.polly * 0.1.2 2016-12-08 [1] CRAN (R 3.6.0)
#> aws.signature 0.5.2 2019-08-08 [1] CRAN (R 3.6.0)
#> backports 1.1.4 2019-04-10 [1] CRAN (R 3.6.0)
#> base64enc 0.1-3 2015-07-28 [1] CRAN (R 3.6.0)
#> callr 3.3.1 2019-07-18 [1] CRAN (R 3.6.0)
#> cli 1.1.0 2019-03-19 [1] CRAN (R 3.6.0)
#> crayon 1.3.4 2017-09-16 [1] CRAN (R 3.6.0)
#> curl 4.0 2019-07-22 [1] CRAN (R 3.6.0)
#> desc 1.2.0 2019-07-10 [1] Github (muschellij2/desc@b0c374f)
#> devtools 2.1.0 2019-07-06 [1] CRAN (R 3.6.0)
#> digest 0.6.20 2019-07-04 [1] CRAN (R 3.6.0)
#> evaluate 0.14 2019-05-28 [1] CRAN (R 3.6.0)
#> fs 1.3.1 2019-05-06 [1] CRAN (R 3.6.0)
#> glue 1.3.1 2019-03-12 [1] CRAN (R 3.6.0)
#> highr 0.8 2019-03-20 [1] CRAN (R 3.6.0)
#> htmltools 0.3.6 2017-04-28 [1] CRAN (R 3.6.0)
#> httr 1.4.1 2019-08-05 [1] CRAN (R 3.6.0)
#> jsonlite 1.6 2018-12-07 [1] CRAN (R 3.6.0)
#> knitr 1.24 2019-08-08 [1] CRAN (R 3.6.0)
#> magrittr 1.5 2014-11-22 [1] CRAN (R 3.6.0)
#> MASS 7.3-51.4 2019-03-31 [1] CRAN (R 3.6.0)
#> memoise 1.1.0 2017-04-21 [1] CRAN (R 3.6.0)
#> pkgbuild 1.0.3 2019-03-20 [1] CRAN (R 3.6.0)
#> pkgload 1.0.2 2018-10-29 [1] CRAN (R 3.6.0)
#> prettyunits 1.0.2 2015-07-13 [1] CRAN (R 3.6.0)
#> processx 3.4.1 2019-07-18 [1] CRAN (R 3.6.0)
#> ps 1.3.0 2018-12-21 [1] CRAN (R 3.6.0)
#> R6 2.4.0 2019-02-14 [1] CRAN (R 3.6.0)
#> Rcpp 1.0.2 2019-07-25 [1] CRAN (R 3.6.0)
#> remotes 2.1.0 2019-06-24 [1] CRAN (R 3.6.0)
#> rlang 0.4.0 2019-06-25 [1] CRAN (R 3.6.0)
#> rmarkdown 1.14 2019-07-12 [1] CRAN (R 3.6.0)
#> rprojroot 1.3-2 2018-01-03 [1] CRAN (R 3.6.0)
#> sessioninfo 1.1.1 2018-11-05 [1] CRAN (R 3.6.0)
#> signal 0.7-6 2015-07-30 [1] CRAN (R 3.6.0)
#> stringi 1.4.3 2019-03-12 [1] CRAN (R 3.6.0)
#> stringr 1.4.0 2019-02-10 [1] CRAN (R 3.6.0)
#> testthat 2.1.1 2019-04-23 [1] CRAN (R 3.6.0)
#> text2speech * 0.2.7 2019-08-14 [1] local
#> tuneR * 1.3.3 2018-07-08 [1] CRAN (R 3.6.0)
#> usethis 1.5.1 2019-07-04 [1] CRAN (R 3.6.0)
#> withr 2.1.2 2018-03-15 [1] CRAN (R 3.6.0)
#> xfun 0.8 2019-06-25 [1] CRAN (R 3.6.0)
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#>
#> [1] /Library/Frameworks/R.framework/Versions/3.6/Resources/libraryquestion about package
The list_voices() in the aws.polly R package it's not working for me. I am sure I am communicating well with AWS.
library("aws.polly")
aws.polly::list_voices()Warning messages:
1: In pollyHTTP(action = "voices", verb = "GET", query = query, ...) :
Forbidden (HTTP 403).
2: In structure(out[["Voices"]], NextToken = out[["NextToken"]]) :
Calling 'structure(NULL, *)' is deprecated, as NULL cannot have attributes.
Consider 'structure(list(), *)' instead.
─ Session info ──────────────────────────────────────────────
R version 4.0.0 (2020-04-24)
Platform: x86_64-apple-darwin17.0 (64-bit)
Running under: macOS Mojave 10.14.6
Matrix products: default
BLAS: /System/Library/Frameworks/Accelerate.framework/Versions/A/Frameworks/vecLib.framework/Versions/A/libBLAS.dylib
LAPACK: /Library/Frameworks/R.framework/Versions/4.0/Resources/lib/libRlapack.dylib
locale:
[1] en_US.UTF-8/en_US.UTF-8/en_US.UTF-8/C/en_US.UTF-8/en_US.UTF-8
attached base packages:
[1] stats graphics grDevices utils datasets
[6] methods base
other attached packages:
[1] aws.signature_0.6.0 aws.polly_0.1.5.9000
loaded via a namespace (and not attached):
[1] compiler_4.0.0 prettyunits_1.1.1 base64enc_0.1-3
[4] remotes_2.1.1 tools_4.0.0 testthat_2.3.2
[7] digest_0.6.25 drat_0.1.6 pkgbuild_1.0.8
[10] pkgload_1.1.0 jsonlite_1.6.1 memoise_1.1.0
[13] rlang_0.4.6 cli_2.0.2 rstudioapi_0.11
[16] yaml_2.2.1 curl_4.3 withr_2.2.0
[19] httr_1.4.1 desc_1.2.0 fs_1.4.1
[22] devtools_2.3.0 rprojroot_1.3-2 glue_1.4.1
[25] R6_2.4.1 processx_3.4.2 fansi_0.4.1
[28] sessioninfo_1.1.1 callr_3.4.3 tuneR_1.3.3
[31] magrittr_1.5 backports_1.1.7 ps_1.3.3
[34] ellipsis_0.3.1 fortunes_1.5-4 MASS_7.3-51.5
[37] usethis_1.6.1 assertthat_0.2.1 signal_0.7-6
[40] crayon_1.3.4
AWS STS tokens are not used properly in `pollyHTTP`
The session_token in pollyHTTP is not being read from locate_credentials or environment like it should, and default arg value is NULL which is causing temporary credentials to not work.
More details at cloudyr/aws.signature#19 (comment)
It does work in s3HTTP since it is using session_token = Sys.getenv("AWS_SESSION_TOKEN") in the argument list.
list_voices should list all voices
Currently, list_voices() lists by default only American English voices. It is not necessarily obvious that aws.polly actually supports a lot more languages. (see e.g. #10)
To find other voices, one has to either use list_voices(language = NULL) to list all voices (#5), or know the language code.
I find this not only unintuitive but needlessly US-centric.
I therefore propose that list_voices() should list all available voices by default (61 at the time of writing). US English voices will still be available with list_voices(language = "en-US").
I'll leave this for a while in case anyone wants to give some feedback.
Spanish compatibility
Please specify whether your issue is about:
- a suggested code or documentation change, improvement to the code, or feature request
It is possible to include Spanish voices of Polly?
Thanks in advance!
Could not find function locate_credentials()
Installed the package from Github using devtools::install_github("cloudyr/aws.polly"). Then ran the following example from the README:
> library("aws.polly")
> vec <- synthesize("Hello world!", voice = "Joanna")and get the following error:
Error in locate_credentials(key = key, secret = secret, session_token = session_token, :
could not find function "locate_credentials"
if I manually load the aws.signature package using library("aws.signature") then it works.
Seeking new maintainer!
This package is not being actively maintained. If you're interested in contributing or taking over, please express your interest here.
Release aws.polly 0.1.5
Prepare for release:
- Check that description is informative
- Check licensing of included files
-
usethis::use_cran_comments() -
devtools::check() -
devtools::check_win_devel() -
rhub::check_for_cran()
Submit to CRAN:
-
usethis::use_version('patch') - Update
cran-comments.md -
devtools::submit_cran() - Approve email
Wait for CRAN...
- Accepted 🎉
-
usethis::use_github_release() -
usethis::use_dev_version() - Update install instructions in README
- Tweet
Neural Engine
Please specify whether your issue is about:
- a possible bug
- a question about package functionality
- a suggested code or documentation change, improvement to the code, or feature request
Neural engines and other parameters can be passed to synthesize: https://docs.aws.amazon.com/polly/latest/dg/API_SynthesizeSpeech.html#polly-SynthesizeSpeech-request-Engine
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