texttospeech-gen.go

// Package texttospeech provides access to the Cloud Text-to-Speech API.
//
// This package is DEPRECATED. Use package cloud.google.com/go/texttospeech/apiv1 instead.
//
// See https://cloud.google.com/text-to-speech/
//
// Usage example:
//
//   import "google.golang.org/api/texttospeech/v1"
//   ...
//   texttospeechService, err := texttospeech.New(oauthHttpClient)
package texttospeech // import "google.golang.org/api/texttospeech/v1"

import (
	"bytes"
	"encoding/json"
	"errors"
	"fmt"
	context "golang.org/x/net/context"
	ctxhttp "golang.org/x/net/context/ctxhttp"
	gensupport "google.golang.org/api/gensupport"
	googleapi "google.golang.org/api/googleapi"
	"io"
	"net/http"
	"net/url"
	"strconv"
	"strings"
)

// Always reference these packages, just in case the auto-generated code
// below doesn't.
var _ = bytes.NewBuffer
var _ = strconv.Itoa
var _ = fmt.Sprintf
var _ = json.NewDecoder
var _ = io.Copy
var _ = url.Parse
var _ = gensupport.MarshalJSON
var _ = googleapi.Version
var _ = errors.New
var _ = strings.Replace
var _ = context.Canceled
var _ = ctxhttp.Do

const apiId = "texttospeech:v1"
const apiName = "texttospeech"
const apiVersion = "v1"
const basePath = "https://texttospeech.googleapis.com/"

// OAuth2 scopes used by this API.
const (
	// View and manage your data across Google Cloud Platform services
	CloudPlatformScope = "https://www.googleapis.com/auth/cloud-platform"
)

func New(client *http.Client) (*Service, error) {
	if client == nil {
		return nil, errors.New("client is nil")
	}
	s := &Service{client: client, BasePath: basePath}
	s.Text = NewTextService(s)
	s.Voices = NewVoicesService(s)
	return s, nil
}

type Service struct {
	client    *http.Client
	BasePath  string // API endpoint base URL
	UserAgent string // optional additional User-Agent fragment

	Text *TextService

	Voices *VoicesService
}

func (s *Service) userAgent() string {
	if s.UserAgent == "" {
		return googleapi.UserAgent
	}
	return googleapi.UserAgent + " " + s.UserAgent
}

func NewTextService(s *Service) *TextService {
	rs := &TextService{s: s}
	return rs
}

type TextService struct {
	s *Service
}

func NewVoicesService(s *Service) *VoicesService {
	rs := &VoicesService{s: s}
	return rs
}

type VoicesService struct {
	s *Service
}

// AudioConfig: Description of audio data to be synthesized.
type AudioConfig struct {
	// AudioEncoding: Required. The format of the requested audio byte
	// stream.
	//
	// Possible values:
	//   "AUDIO_ENCODING_UNSPECIFIED" - Not specified. Will return result
	// google.rpc.Code.INVALID_ARGUMENT.
	//   "LINEAR16" - Uncompressed 16-bit signed little-endian samples
	// (Linear PCM).
	// Audio content returned as LINEAR16 also contains a WAV header.
	//   "MP3" - MP3 audio.
	//   "OGG_OPUS" - Opus encoded audio wrapped in an ogg container. The
	// result will be a
	// file which can be played natively on Android, and in browsers (at
	// least
	// Chrome and Firefox). The quality of the encoding is considerably
	// higher
	// than MP3 while using approximately the same bitrate.
	AudioEncoding string `json:"audioEncoding,omitempty"`

	// Pitch: Optional speaking pitch, in the range [-20.0, 20.0]. 20 means
	// increase 20
	// semitones from the original pitch. -20 means decrease 20 semitones
	// from the
	// original pitch.
	Pitch float64 `json:"pitch,omitempty"`

	// SampleRateHertz: The synthesis sample rate (in hertz) for this audio.
	// Optional.  If this is
	// different from the voice's natural sample rate, then the synthesizer
	// will
	// honor this request by converting to the desired sample rate (which
	// might
	// result in worse audio quality), unless the specified sample rate is
	// not
	// supported for the encoding chosen, in which case it will fail the
	// request
	// and return google.rpc.Code.INVALID_ARGUMENT.
	SampleRateHertz int64 `json:"sampleRateHertz,omitempty"`

	// SpeakingRate: Optional speaking rate/speed, in the range [0.25, 4.0].
	// 1.0 is the normal
	// native speed supported by the specific voice. 2.0 is twice as fast,
	// and
	// 0.5 is half as fast. If unset(0.0), defaults to the native 1.0 speed.
	// Any
	// other values < 0.25 or > 4.0 will return an error.
	SpeakingRate float64 `json:"speakingRate,omitempty"`

	// VolumeGainDb: Optional volume gain (in dB) of the normal native
	// volume supported by the
	// specific voice, in the range [-96.0, 16.0]. If unset, or set to a
	// value of
	// 0.0 (dB), will play at normal native signal amplitude. A value of
	// -6.0 (dB)
	// will play at approximately half the amplitude of the normal native
	// signal
	// amplitude. A value of +6.0 (dB) will play at approximately twice
	// the
	// amplitude of the normal native signal amplitude. Strongly recommend
	// not to
	// exceed +10 (dB) as there's usually no effective increase in loudness
	// for
	// any value greater than that.
	VolumeGainDb float64 `json:"volumeGainDb,omitempty"`

	// ForceSendFields is a list of field names (e.g. "AudioEncoding") to
	// unconditionally include in API requests. By default, fields with
	// empty values are omitted from API requests. However, any non-pointer,
	// non-interface field appearing in ForceSendFields will be sent to the
	// server regardless of whether the field is empty or not. This may be
	// used to include empty fields in Patch requests.
	ForceSendFields []string `json:"-"`

	// NullFields is a list of field names (e.g. "AudioEncoding") to include
	// in API requests with the JSON null value. By default, fields with
	// empty values are omitted from API requests. However, any field with
	// an empty value appearing in NullFields will be sent to the server as
	// null. It is an error if a field in this list has a non-empty value.
	// This may be used to include null fields in Patch requests.
	NullFields []string `json:"-"`
}

func (s *AudioConfig) MarshalJSON() ([]byte, error) {
	type NoMethod AudioConfig
	raw := NoMethod(*s)
	return gensupport.MarshalJSON(raw, s.ForceSendFields, s.NullFields)
}

func (s *AudioConfig) UnmarshalJSON(data []byte) error {
	type NoMethod AudioConfig
	var s1 struct {
		Pitch        gensupport.JSONFloat64 `json:"pitch"`
		SpeakingRate gensupport.JSONFloat64 `json:"speakingRate"`
		VolumeGainDb gensupport.JSONFloat64 `json:"volumeGainDb"`
		*NoMethod
	}
	s1.NoMethod = (*NoMethod)(s)
	if err := json.Unmarshal(data, &s1); err != nil {
		return err
	}
	s.Pitch = float64(s1.Pitch)
	s.SpeakingRate = float64(s1.SpeakingRate)
	s.VolumeGainDb = float64(s1.VolumeGainDb)
	return nil
}

// ListVoicesResponse: The message returned to the client by the
// `ListVoices` method.
type ListVoicesResponse struct {
	// Voices: The list of voices.
	Voices []*Voice `json:"voices,omitempty"`

	// ServerResponse contains the HTTP response code and headers from the
	// server.
	googleapi.ServerResponse `json:"-"`

	// ForceSendFields is a list of field names (e.g. "Voices") to
	// unconditionally include in API requests. By default, fields with
	// empty values are omitted from API requests. However, any non-pointer,
	// non-interface field appearing in ForceSendFields will be sent to the
	// server regardless of whether the field is empty or not. This may be
	// used to include empty fields in Patch requests.
	ForceSendFields []string `json:"-"`

	// NullFields is a list of field names (e.g. "Voices") to include in API
	// requests with the JSON null value. By default, fields with empty
	// values are omitted from API requests. However, any field with an
	// empty value appearing in NullFields will be sent to the server as
	// null. It is an error if a field in this list has a non-empty value.
	// This may be used to include null fields in Patch requests.
	NullFields []string `json:"-"`
}

func (s *ListVoicesResponse) MarshalJSON() ([]byte, error) {
	type NoMethod ListVoicesResponse
	raw := NoMethod(*s)
	return gensupport.MarshalJSON(raw, s.ForceSendFields, s.NullFields)
}

// SynthesisInput: Contains text input to be synthesized. Either `text`
// or `ssml` must be
// supplied. Supplying both or neither
// returns
// google.rpc.Code.INVALID_ARGUMENT. The input size is limited to
// 5000
// characters.
type SynthesisInput struct {
	// Ssml: The SSML document to be synthesized. The SSML document must be
	// valid
	// and well-formed. Otherwise the RPC will fail and
	// return
	// google.rpc.Code.INVALID_ARGUMENT. For more information,
	// see
	// [SSML](/speech/text-to-speech/docs/ssml).
	Ssml string `json:"ssml,omitempty"`

	// Text: The raw text to be synthesized.
	Text string `json:"text,omitempty"`

	// ForceSendFields is a list of field names (e.g. "Ssml") to
	// unconditionally include in API requests. By default, fields with
	// empty values are omitted from API requests. However, any non-pointer,
	// non-interface field appearing in ForceSendFields will be sent to the
	// server regardless of whether the field is empty or not. This may be
	// used to include empty fields in Patch requests.
	ForceSendFields []string `json:"-"`

	// NullFields is a list of field names (e.g. "Ssml") to include in API
	// requests with the JSON null value. By default, fields with empty
	// values are omitted from API requests. However, any field with an
	// empty value appearing in NullFields will be sent to the server as
	// null. It is an error if a field in this list has a non-empty value.
	// This may be used to include null fields in Patch requests.
	NullFields []string `json:"-"`
}

func (s *SynthesisInput) MarshalJSON() ([]byte, error) {
	type NoMethod SynthesisInput
	raw := NoMethod(*s)
	return gensupport.MarshalJSON(raw, s.ForceSendFields, s.NullFields)
}

// SynthesizeSpeechRequest: The top-level message sent by the client for
// the `SynthesizeSpeech` method.
type SynthesizeSpeechRequest struct {
	// AudioConfig: Required. The configuration of the synthesized audio.
	AudioConfig *AudioConfig `json:"audioConfig,omitempty"`

	// Input: Required. The Synthesizer requires either plain text or SSML
	// as input.
	Input *SynthesisInput `json:"input,omitempty"`

	// Voice: Required. The desired voice of the synthesized audio.
	Voice *VoiceSelectionParams `json:"voice,omitempty"`

	// ForceSendFields is a list of field names (e.g. "AudioConfig") to
	// unconditionally include in API requests. By default, fields with
	// empty values are omitted from API requests. However, any non-pointer,
	// non-interface field appearing in ForceSendFields will be sent to the
	// server regardless of whether the field is empty or not. This may be
	// used to include empty fields in Patch requests.
	ForceSendFields []string `json:"-"`

	// NullFields is a list of field names (e.g. "AudioConfig") to include
	// in API requests with the JSON null value. By default, fields with
	// empty values are omitted from API requests. However, any field with
	// an empty value appearing in NullFields will be sent to the server as
	// null. It is an error if a field in this list has a non-empty value.
	// This may be used to include null fields in Patch requests.
	NullFields []string `json:"-"`
}

func (s *SynthesizeSpeechRequest) MarshalJSON() ([]byte, error) {
	type NoMethod SynthesizeSpeechRequest
	raw := NoMethod(*s)
	return gensupport.MarshalJSON(raw, s.ForceSendFields, s.NullFields)
}

// SynthesizeSpeechResponse: The message returned to the client by the
// `SynthesizeSpeech` method.
type SynthesizeSpeechResponse struct {
	// AudioContent: The audio data bytes encoded as specified in the
	// request, including the
	// header (For LINEAR16 audio, we include the WAV header). Note: as
	// with all bytes fields, protobuffers use a pure binary
	// representation,
	// whereas JSON representations use base64.
	AudioContent string `json:"audioContent,omitempty"`

	// ServerResponse contains the HTTP response code and headers from the
	// server.
	googleapi.ServerResponse `json:"-"`

	// ForceSendFields is a list of field names (e.g. "AudioContent") to
	// unconditionally include in API requests. By default, fields with
	// empty values are omitted from API requests. However, any non-pointer,
	// non-interface field appearing in ForceSendFields will be sent to the
	// server regardless of whether the field is empty or not. This may be
	// used to include empty fields in Patch requests.
	ForceSendFields []string `json:"-"`

	// NullFields is a list of field names (e.g. "AudioContent") to include
	// in API requests with the JSON null value. By default, fields with
	// empty values are omitted from API requests. However, any field with
	// an empty value appearing in NullFields will be sent to the server as
	// null. It is an error if a field in this list has a non-empty value.
	// This may be used to include null fields in Patch requests.
	NullFields []string `json:"-"`
}

func (s *SynthesizeSpeechResponse) MarshalJSON() ([]byte, error) {
	type NoMethod SynthesizeSpeechResponse
	raw := NoMethod(*s)
	return gensupport.MarshalJSON(raw, s.ForceSendFields, s.NullFields)
}

// Voice: Description of a voice supported by the TTS service.
type Voice struct {
	// LanguageCodes: The languages that this voice supports, expressed
	// as
	// [BCP-47](https://www.rfc-editor.org/rfc/bcp/bcp47.txt) language tags
	// (e.g.
	// "en-US", "es-419", "cmn-tw").
	LanguageCodes []string `json:"languageCodes,omitempty"`

	// Name: The name of this voice.  Each distinct voice has a unique name.
	Name string `json:"name,omitempty"`

	// NaturalSampleRateHertz: The natural sample rate (in hertz) for this
	// voice.
	NaturalSampleRateHertz int64 `json:"naturalSampleRateHertz,omitempty"`

	// SsmlGender: The gender of this voice.
	//
	// Possible values:
	//   "SSML_VOICE_GENDER_UNSPECIFIED" - An unspecified gender.
	// In VoiceSelectionParams, this means that the client doesn't care
	// which
	// gender the selected voice will have. In the Voice field
	// of
	// ListVoicesResponse, this may mean that the voice doesn't fit any of
	// the
	// other categories in this enum, or that the gender of the voice isn't
	// known.
	//   "MALE" - A male voice.
	//   "FEMALE" - A female voice.
	//   "NEUTRAL" - A gender-neutral voice.
	SsmlGender string `json:"ssmlGender,omitempty"`

	// ForceSendFields is a list of field names (e.g. "LanguageCodes") to
	// unconditionally include in API requests. By default, fields with
	// empty values are omitted from API requests. However, any non-pointer,
	// non-interface field appearing in ForceSendFields will be sent to the
	// server regardless of whether the field is empty or not. This may be
	// used to include empty fields in Patch requests.
	ForceSendFields []string `json:"-"`

	// NullFields is a list of field names (e.g. "LanguageCodes") to include
	// in API requests with the JSON null value. By default, fields with
	// empty values are omitted from API requests. However, any field with
	// an empty value appearing in NullFields will be sent to the server as
	// null. It is an error if a field in this list has a non-empty value.
	// This may be used to include null fields in Patch requests.
	NullFields []string `json:"-"`
}

func (s *Voice) MarshalJSON() ([]byte, error) {
	type NoMethod Voice
	raw := NoMethod(*s)
	return gensupport.MarshalJSON(raw, s.ForceSendFields, s.NullFields)
}

// VoiceSelectionParams: Description of which voice to use for a
// synthesis request.
type VoiceSelectionParams struct {
	// LanguageCode: The language (and optionally also the region) of the
	// voice expressed as
	// a
	// [BCP-47](https://www.rfc-editor.org/rfc/bcp/bcp47.txt) language tag,
	// e.g.
	// "en-US". Required. This should not include a script tag (e.g.
	// use
	// "cmn-cn" rather than "cmn-Hant-cn"), because the script will be
	// inferred
	// from the input provided in the SynthesisInput.  The TTS service
	// will use this parameter to help choose an appropriate voice.  Note
	// that
	// the TTS service may choose a voice with a slightly different language
	// code
	// than the one selected; it may substitute a different region
	// (e.g. using en-US rather than en-CA if there isn't a Canadian
	// voice
	// available), or even a different language, e.g. using "nb"
	// (Norwegian
	// Bokmal) instead of "no" (Norwegian)".
	LanguageCode string `json:"languageCode,omitempty"`

	// Name: The name of the voice. Optional; if not set, the service will
	// choose a
	// voice based on the other parameters such as language_code and gender.
	Name string `json:"name,omitempty"`

	// SsmlGender: The preferred gender of the voice. Optional; if not set,
	// the service will
	// choose a voice based on the other parameters such as language_code
	// and
	// name. Note that this is only a preference, not requirement; if
	// a
	// voice of the appropriate gender is not available, the synthesizer
	// should
	// substitute a voice with a different gender rather than failing the
	// request.
	//
	// Possible values:
	//   "SSML_VOICE_GENDER_UNSPECIFIED" - An unspecified gender.
	// In VoiceSelectionParams, this means that the client doesn't care
	// which
	// gender the selected voice will have. In the Voice field
	// of
	// ListVoicesResponse, this may mean that the voice doesn't fit any of
	// the
	// other categories in this enum, or that the gender of the voice isn't
	// known.
	//   "MALE" - A male voice.
	//   "FEMALE" - A female voice.
	//   "NEUTRAL" - A gender-neutral voice.
	SsmlGender string `json:"ssmlGender,omitempty"`

	// ForceSendFields is a list of field names (e.g. "LanguageCode") to
	// unconditionally include in API requests. By default, fields with
	// empty values are omitted from API requests. However, any non-pointer,
	// non-interface field appearing in ForceSendFields will be sent to the
	// server regardless of whether the field is empty or not. This may be
	// used to include empty fields in Patch requests.
	ForceSendFields []string `json:"-"`

	// NullFields is a list of field names (e.g. "LanguageCode") to include
	// in API requests with the JSON null value. By default, fields with
	// empty values are omitted from API requests. However, any field with
	// an empty value appearing in NullFields will be sent to the server as
	// null. It is an error if a field in this list has a non-empty value.
	// This may be used to include null fields in Patch requests.
	NullFields []string `json:"-"`
}

func (s *VoiceSelectionParams) MarshalJSON() ([]byte, error) {
	type NoMethod VoiceSelectionParams
	raw := NoMethod(*s)
	return gensupport.MarshalJSON(raw, s.ForceSendFields, s.NullFields)
}

// method id "texttospeech.text.synthesize":

type TextSynthesizeCall struct {
	s                       *Service
	synthesizespeechrequest *SynthesizeSpeechRequest
	urlParams_              gensupport.URLParams
	ctx_                    context.Context
	header_                 http.Header
}

// Synthesize: Synthesizes speech synchronously: receive results after
// all text input
// has been processed.
func (r *TextService) Synthesize(synthesizespeechrequest *SynthesizeSpeechRequest) *TextSynthesizeCall {
	c := &TextSynthesizeCall{s: r.s, urlParams_: make(gensupport.URLParams)}
	c.synthesizespeechrequest = synthesizespeechrequest
	return c
}

// Fields allows partial responses to be retrieved. See
// https://developers.google.com/gdata/docs/2.0/basics#PartialResponse
// for more information.
func (c *TextSynthesizeCall) Fields(s ...googleapi.Field) *TextSynthesizeCall {
	c.urlParams_.Set("fields", googleapi.CombineFields(s))
	return c
}

// Context sets the context to be used in this call's Do method. Any
// pending HTTP request will be aborted if the provided context is
// canceled.
func (c *TextSynthesizeCall) Context(ctx context.Context) *TextSynthesizeCall {
	c.ctx_ = ctx
	return c
}

// Header returns an http.Header that can be modified by the caller to
// add HTTP headers to the request.
func (c *TextSynthesizeCall) Header() http.Header {
	if c.header_ == nil {
		c.header_ = make(http.Header)
	}
	return c.header_
}

func (c *TextSynthesizeCall) doRequest(alt string) (*http.Response, error) {
	reqHeaders := make(http.Header)
	for k, v := range c.header_ {
		reqHeaders[k] = v
	}
	reqHeaders.Set("User-Agent", c.s.userAgent())
	var body io.Reader = nil
	body, err := googleapi.WithoutDataWrapper.JSONReader(c.synthesizespeechrequest)
	if err != nil {
		return nil, err
	}
	reqHeaders.Set("Content-Type", "application/json")
	c.urlParams_.Set("alt", alt)
	c.urlParams_.Set("prettyPrint", "false")
	urls := googleapi.ResolveRelative(c.s.BasePath, "v1/text:synthesize")
	urls += "?" + c.urlParams_.Encode()
	req, _ := http.NewRequest("POST", urls, body)
	req.Header = reqHeaders
	return gensupport.SendRequest(c.ctx_, c.s.client, req)
}

// Do executes the "texttospeech.text.synthesize" call.
// Exactly one of *SynthesizeSpeechResponse or error will be non-nil.
// Any non-2xx status code is an error. Response headers are in either
// *SynthesizeSpeechResponse.ServerResponse.Header or (if a response was
// returned at all) in error.(*googleapi.Error).Header. Use
// googleapi.IsNotModified to check whether the returned error was
// because http.StatusNotModified was returned.
func (c *TextSynthesizeCall) Do(opts ...googleapi.CallOption) (*SynthesizeSpeechResponse, error) {
	gensupport.SetOptions(c.urlParams_, opts...)
	res, err := c.doRequest("json")
	if res != nil && res.StatusCode == http.StatusNotModified {
		if res.Body != nil {
			res.Body.Close()
		}
		return nil, &googleapi.Error{
			Code:   res.StatusCode,
			Header: res.Header,
		}
	}
	if err != nil {
		return nil, err
	}
	defer googleapi.CloseBody(res)
	if err := googleapi.CheckResponse(res); err != nil {
		return nil, err
	}
	ret := &SynthesizeSpeechResponse{
		ServerResponse: googleapi.ServerResponse{
			Header:         res.Header,
			HTTPStatusCode: res.StatusCode,
		},
	}
	target := &ret
	if err := gensupport.DecodeResponse(target, res); err != nil {
		return nil, err
	}
	return ret, nil
	// {
	//   "description": "Synthesizes speech synchronously: receive results after all text input\nhas been processed.",
	//   "flatPath": "v1/text:synthesize",
	//   "httpMethod": "POST",
	//   "id": "texttospeech.text.synthesize",
	//   "parameterOrder": [],
	//   "parameters": {},
	//   "path": "v1/text:synthesize",
	//   "request": {
	//     "$ref": "SynthesizeSpeechRequest"
	//   },
	//   "response": {
	//     "$ref": "SynthesizeSpeechResponse"
	//   },
	//   "scopes": [
	//     "https://www.googleapis.com/auth/cloud-platform"
	//   ]
	// }

}

// method id "texttospeech.voices.list":

type VoicesListCall struct {
	s            *Service
	urlParams_   gensupport.URLParams
	ifNoneMatch_ string
	ctx_         context.Context
	header_      http.Header
}

// List: Returns a list of Voice supported for synthesis.
func (r *VoicesService) List() *VoicesListCall {
	c := &VoicesListCall{s: r.s, urlParams_: make(gensupport.URLParams)}
	return c
}

// LanguageCode sets the optional parameter "languageCode": Optional
// (but
// recommended)
// [BCP-47](https://www.rfc-editor.org/rfc/bcp/bcp47.txt) language tag.
// If
// specified, the ListVoices call will only return voices that can be
// used to
// synthesize this language_code. E.g. when specifying "en-NZ", you will
// get
// supported "en-*" voices; when specifying "no", you will get
// supported
// "no-*" (Norwegian) and "nb-*" (Norwegian Bokmal) voices; specifying
// "zh"
// will also get supported "cmn-*" voices; specifying "zh-hk" will also
// get
// supported "yue-*" voices.
func (c *VoicesListCall) LanguageCode(languageCode string) *VoicesListCall {
	c.urlParams_.Set("languageCode", languageCode)
	return c
}

// Fields allows partial responses to be retrieved. See
// https://developers.google.com/gdata/docs/2.0/basics#PartialResponse
// for more information.
func (c *VoicesListCall) Fields(s ...googleapi.Field) *VoicesListCall {
	c.urlParams_.Set("fields", googleapi.CombineFields(s))
	return c
}

// IfNoneMatch sets the optional parameter which makes the operation
// fail if the object's ETag matches the given value. This is useful for
// getting updates only after the object has changed since the last
// request. Use googleapi.IsNotModified to check whether the response
// error from Do is the result of In-None-Match.
func (c *VoicesListCall) IfNoneMatch(entityTag string) *VoicesListCall {
	c.ifNoneMatch_ = entityTag
	return c
}

// Context sets the context to be used in this call's Do method. Any
// pending HTTP request will be aborted if the provided context is
// canceled.
func (c *VoicesListCall) Context(ctx context.Context) *VoicesListCall {
	c.ctx_ = ctx
	return c
}

// Header returns an http.Header that can be modified by the caller to
// add HTTP headers to the request.
func (c *VoicesListCall) Header() http.Header {
	if c.header_ == nil {
		c.header_ = make(http.Header)
	}
	return c.header_
}

func (c *VoicesListCall) doRequest(alt string) (*http.Response, error) {
	reqHeaders := make(http.Header)
	for k, v := range c.header_ {
		reqHeaders[k] = v
	}
	reqHeaders.Set("User-Agent", c.s.userAgent())
	if c.ifNoneMatch_ != "" {
		reqHeaders.Set("If-None-Match", c.ifNoneMatch_)
	}
	var body io.Reader = nil
	c.urlParams_.Set("alt", alt)
	c.urlParams_.Set("prettyPrint", "false")
	urls := googleapi.ResolveRelative(c.s.BasePath, "v1/voices")
	urls += "?" + c.urlParams_.Encode()
	req, _ := http.NewRequest("GET", urls, body)
	req.Header = reqHeaders
	return gensupport.SendRequest(c.ctx_, c.s.client, req)
}

// Do executes the "texttospeech.voices.list" call.
// Exactly one of *ListVoicesResponse or error will be non-nil. Any
// non-2xx status code is an error. Response headers are in either
// *ListVoicesResponse.ServerResponse.Header or (if a response was
// returned at all) in error.(*googleapi.Error).Header. Use
// googleapi.IsNotModified to check whether the returned error was
// because http.StatusNotModified was returned.
func (c *VoicesListCall) Do(opts ...googleapi.CallOption) (*ListVoicesResponse, error) {
	gensupport.SetOptions(c.urlParams_, opts...)
	res, err := c.doRequest("json")
	if res != nil && res.StatusCode == http.StatusNotModified {
		if res.Body != nil {
			res.Body.Close()
		}
		return nil, &googleapi.Error{
			Code:   res.StatusCode,
			Header: res.Header,
		}
	}
	if err != nil {
		return nil, err
	}
	defer googleapi.CloseBody(res)
	if err := googleapi.CheckResponse(res); err != nil {
		return nil, err
	}
	ret := &ListVoicesResponse{
		ServerResponse: googleapi.ServerResponse{
			Header:         res.Header,
			HTTPStatusCode: res.StatusCode,
		},
	}
	target := &ret
	if err := gensupport.DecodeResponse(target, res); err != nil {
		return nil, err
	}
	return ret, nil
	// {
	//   "description": "Returns a list of Voice supported for synthesis.",
	//   "flatPath": "v1/voices",
	//   "httpMethod": "GET",
	//   "id": "texttospeech.voices.list",
	//   "parameterOrder": [],
	//   "parameters": {
	//     "languageCode": {
	//       "description": "Optional (but recommended)\n[BCP-47](https://www.rfc-editor.org/rfc/bcp/bcp47.txt) language tag. If\nspecified, the ListVoices call will only return voices that can be used to\nsynthesize this language_code. E.g. when specifying \"en-NZ\", you will get\nsupported \"en-*\" voices; when specifying \"no\", you will get supported\n\"no-*\" (Norwegian) and \"nb-*\" (Norwegian Bokmal) voices; specifying \"zh\"\nwill also get supported \"cmn-*\" voices; specifying \"zh-hk\" will also get\nsupported \"yue-*\" voices.",
	//       "location": "query",
	//       "type": "string"
	//     }
	//   },
	//   "path": "v1/voices",
	//   "response": {
	//     "$ref": "ListVoicesResponse"
	//   },
	//   "scopes": [
	//     "https://www.googleapis.com/auth/cloud-platform"
	//   ]
	// }

}