deepgram 0.9.2

Community Rust SDK for Deepgram's automated speech recognition APIs.
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155

//! Rest TTS module

use bytes::Bytes;
use futures::stream::{Stream, StreamExt};
use reqwest::RequestBuilder;
use serde_json::Value;
use tokio::sync::mpsc;
use tokio_stream::wrappers::ReceiverStream;
use url::Url;

use crate::{DeepgramError, Speak};

use super::options::{Options, SerializableOptions};

static DEEPGRAM_API_URL_SPEAK: &str = "v1/speak";

impl Speak<'_> {
    /// Sends a request to Deepgram to transcribe pre-recorded audio.
    pub async fn speak_to_file(
        &self,
        text: &str,
        options: &Options,
        output_file: &std::path::Path,
    ) -> Result<(), DeepgramError> {
        let payload = Value::Object(
            [("text".to_string(), Value::String(text.to_string()))]
                .iter()
                .cloned()
                .collect(),
        );

        let request_builder = self
            .0
            .client
            .post(self.speak_url())
            .query(&SerializableOptions(options))
            .json(&payload);

        self.send_and_save_response(request_builder, output_file)
            .await
    }

    async fn send_and_save_response(
        &self,
        request_builder: RequestBuilder,
        output_file: &std::path::Path,
    ) -> Result<(), DeepgramError> {
        let mut response = request_builder.send().await?;

        if let Err(err) = response.error_for_status_ref() {
            let status = response.status();
            let error_text = response.text().await?;
            eprintln!("Failed to generate speech: {status}");
            eprintln!("Error details: {error_text}");
            return Err(DeepgramError::DeepgramApiError {
                body: error_text,
                err,
            });
        }

        // Create the output file
        let mut file = std::fs::File::create(output_file)?;

        // Stream the response body to the file
        while let Some(chunk) = response.chunk().await? {
            std::io::copy(&mut chunk.as_ref(), &mut file)?;
        }

        println!("Audio saved to {output_file:?}");

        Ok(())
    }

    /// Sends a request to Deepgram to transcribe pre-recorded audio.
    pub async fn speak_to_stream(
        &self,
        text: &str,
        options: &Options,
    ) -> Result<impl Stream<Item = Bytes>, DeepgramError> {
        let payload = Value::Object(
            [("text".to_string(), Value::String(text.to_string()))]
                .iter()
                .cloned()
                .collect(),
        );

        let request_builder = self
            .0
            .client
            .post(self.speak_url())
            .query(&SerializableOptions(options))
            .json(&payload);

        self.send_and_stream_response(request_builder).await
    }

    async fn send_and_stream_response(
        &self,
        request_builder: RequestBuilder,
    ) -> Result<impl Stream<Item = Bytes>, DeepgramError> {
        let response = request_builder.send().await?;

        if let Err(err) = response.error_for_status_ref() {
            let status = response.status();
            let error_text = response.text().await?;
            eprintln!("Failed to generate speech: {status}");
            eprintln!("Error details: {error_text}");
            return Err(DeepgramError::DeepgramApiError {
                body: error_text,
                err,
            });
        }

        let (tx, rx) = mpsc::channel(1024);
        let rx_stream = ReceiverStream::new(rx);

        tokio::spawn(async move {
            let mut stream = response.bytes_stream();

            while let Some(chunk) = stream.next().await {
                match chunk {
                    Ok(data) => {
                        if tx.send(data).await.is_err() {
                            break;
                        }
                    }
                    Err(e) => {
                        eprintln!("Error streaming response: {e}");
                        break;
                    }
                }
            }
        });

        Ok(rx_stream)
    }

    fn speak_url(&self) -> Url {
        self.0.base_url.join(DEEPGRAM_API_URL_SPEAK).unwrap()
    }
}

#[cfg(test)]
mod tests {
    use crate::Deepgram;

    #[test]
    fn listen_url() {
        let dg = Deepgram::new("token").unwrap();
        assert_eq!(
            &dg.text_to_speech().speak_url().to_string(),
            "https://api.deepgram.com/v1/speak"
        );
    }
}