online paraformer and ctc model's tokens file can be loaded from the …

…memory buffers

added 2 exmaples respectively

c-api-examples/streaming-ctc-buffered-tokens-hotwords-c-api.c

@@ -0,0 +1,179 @@
+// c-api-examples/streaming-ctc-buffered-tokens-hotwords-c-api.c
+//
+// Copyright (c)  2024  Xiaomi Corporation
+// Copyright (c)  2024  Luo Xiao
+
+//
+// This file demonstrates how to use streaming Zipformer2 Ctc with sherpa-onnx's
+// C API and with tokens and hotwords loaded from buffered strings instead of
+// from external files API.
+// clang-format off
+// 
+// wget https://github.com/k2-fsa/sherpa-onnx/releases/download/asr-models/sherpa-onnx-streaming-zipformer-ctc-multi-zh-hans-2023-12-13.tar.bz2
+// tar xvf sherpa-onnx-streaming-zipformer-ctc-multi-zh-hans-2023-12-13.tar.bz2
+// rm sherpa-onnx-streaming-zipformer-ctc-multi-zh-hans-2023-12-13.tar.bz2
+//
+// clang-format on
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "sherpa-onnx/c-api/c-api.h"
+
+static size_t ReadFile(const char *filename, const char **buffer_out) {
+  FILE *file = fopen(filename, "r");
+  if (file == NULL) {
+    fprintf(stderr, "Failed to open %s\n", filename);
+    return -1;
+  }
+  fseek(file, 0L, SEEK_END);
+  long size = ftell(file);
+  rewind(file);
+  *buffer_out = malloc(size);
+  if (*buffer_out == NULL) {
+    fclose(file);
+    fprintf(stderr, "Memory error\n");
+    return -1;
+  }
+  size_t read_bytes = fread(*buffer_out, 1, size, file);
+  if (read_bytes != size) {
+    printf("Errors occured in reading the file %s\n", filename);
+    free((void *)*buffer_out);
+    *buffer_out = NULL;
+    fclose(file);
+    return -1;
+  }
+  fclose(file);
+  return read_bytes;
+}
+
+int32_t main() {
+  const char *wav_filename =
+      "sherpa-onnx-streaming-zipformer-ctc-multi-zh-hans-2023-12-13/test_wavs/"
+      "DEV_T0000000000.wav";
+  const char *model_filename =
+      "sherpa-onnx-streaming-zipformer-ctc-multi-zh-hans-2023-12-13/"
+      "ctc-epoch-20-avg-1-chunk-16-left-128.int8";
+  const char *tokens_filename =
+      "sherpa-onnx-streaming-zipformer-ctc-multi-zh-hans-2023-12-13/tokens.txt";
+  const char *provider = "cpu";
+
+  const SherpaOnnxWave *wave = SherpaOnnxReadWave(wav_filename);
+  if (wave == NULL) {
+    fprintf(stderr, "Failed to read %s\n", wav_filename);
+    return -1;
+  }
+
+  // reading tokens and hotwords to buffers
+  const char *tokens_buf;
+  size_t token_buf_size = ReadFile(tokens_filename, &tokens_buf);
+  if (token_buf_size < 1) {
+    fprintf(stderr, "Please check your tokens.txt!\n");
+    free((void *)tokens_buf);
+    return -1;
+  }
+
+  // Zipformer2Ctc config
+  SherpaOnnxOnlineZipformer2CtcModelConfig zipformer2_ctc_config;
+  memset(&zipformer2_ctc_config, 0, sizeof(zipformer2_ctc_config));
+  zipformer2_ctc_config.model = model_filename;
+
+  // Online model config
+  SherpaOnnxOnlineModelConfig online_model_config;
+  memset(&online_model_config, 0, sizeof(online_model_config));
+  online_model_config.debug = 1;
+  online_model_config.num_threads = 1;
+  online_model_config.provider = provider;
+  online_model_config.tokens_buf = tokens_buf;
+  online_model_config.tokens_buf_size = token_buf_size;
+  online_model_config.zipformer2_ctc = zipformer2_ctc_config;
+
+  // Recognizer config
+  SherpaOnnxOnlineRecognizerConfig recognizer_config;
+  memset(&recognizer_config, 0, sizeof(recognizer_config));
+  recognizer_config.decoding_method = "greedy_search";
+  recognizer_config.model_config = online_model_config;
+
+  SherpaOnnxOnlineRecognizer *recognizer =
+      SherpaOnnxCreateOnlineRecognizer(&recognizer_config);
+
+  free((void *)tokens_buf);
+  tokens_buf = NULL;
+
+  if (recognizer == NULL) {
+    fprintf(stderr, "Please check your config!\n");
+    SherpaOnnxFreeWave(wave);
+    return -1;
+  }
+
+  SherpaOnnxOnlineStream *stream = SherpaOnnxCreateOnlineStream(recognizer);
+
+  const SherpaOnnxDisplay *display = SherpaOnnxCreateDisplay(50);
+  int32_t segment_id = 0;
+
+// simulate streaming. You can choose an arbitrary N
+#define N 3200
+
+  fprintf(stderr, "sample rate: %d, num samples: %d, duration: %.2f s\n",
+          wave->sample_rate, wave->num_samples,
+          (float)wave->num_samples / wave->sample_rate);
+
+  int32_t k = 0;
+  while (k < wave->num_samples) {
+    int32_t start = k;
+    int32_t end =
+        (start + N > wave->num_samples) ? wave->num_samples : (start + N);
+    k += N;
+
+    SherpaOnnxOnlineStreamAcceptWaveform(stream, wave->sample_rate,
+                                         wave->samples + start, end - start);
+    while (SherpaOnnxIsOnlineStreamReady(recognizer, stream)) {
+      SherpaOnnxDecodeOnlineStream(recognizer, stream);
+    }
+
+    const SherpaOnnxOnlineRecognizerResult *r =
+        SherpaOnnxGetOnlineStreamResult(recognizer, stream);
+
+    if (strlen(r->text)) {
+      SherpaOnnxPrint(display, segment_id, r->text);
+    }
+
+    if (SherpaOnnxOnlineStreamIsEndpoint(recognizer, stream)) {
+      if (strlen(r->text)) {
+        ++segment_id;
+      }
+      SherpaOnnxOnlineStreamReset(recognizer, stream);
+    }
+
+    SherpaOnnxDestroyOnlineRecognizerResult(r);
+  }
+
+  // add some tail padding
+  float tail_paddings[4800] = {0};  // 0.3 seconds at 16 kHz sample rate
+  SherpaOnnxOnlineStreamAcceptWaveform(stream, wave->sample_rate, tail_paddings,
+                                       4800);
+
+  SherpaOnnxFreeWave(wave);
+
+  SherpaOnnxOnlineStreamInputFinished(stream);
+  while (SherpaOnnxIsOnlineStreamReady(recognizer, stream)) {
+    SherpaOnnxDecodeOnlineStream(recognizer, stream);
+  }
+
+  const SherpaOnnxOnlineRecognizerResult *r =
+      SherpaOnnxGetOnlineStreamResult(recognizer, stream);
+
+  if (strlen(r->text)) {
+    SherpaOnnxPrint(display, segment_id, r->text);
+  }
+
+  SherpaOnnxDestroyOnlineRecognizerResult(r);
+
+  SherpaOnnxDestroyDisplay(display);
+  SherpaOnnxDestroyOnlineStream(stream);
+  SherpaOnnxDestroyOnlineRecognizer(recognizer);
+  fprintf(stderr, "\n");
+
+  return 0;
+}

c-api-examples/streaming-paraformer-buffered-tokens-hotwords-c-api.c

@@ -0,0 +1,180 @@
+// c-api-examples/streaming-paraformer-buffered-tokens-hotwords-c-api.c
+//
+// Copyright (c)  2024  Xiaomi Corporation
+// Copyright (c)  2024  Luo Xiao
+
+//
+// This file demonstrates how to use streaming Paraformer with sherpa-onnx's C
+// API and with tokens and hotwords loaded from buffered strings instead of from
+// external files API.
+// clang-format off
+// 
+// wget https://github.com/k2-fsa/sherpa-onnx/releases/download/asr-models/sherpa-onnx-streaming-paraformer-bilingual-zh-en.tar.bz2
+// tar xvf sherpa-onnx-streaming-paraformer-bilingual-zh-en.tar.bz2
+// rm sherpa-onnx-streaming-paraformer-bilingual-zh-en.tar.bz2
+//
+// clang-format on
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "sherpa-onnx/c-api/c-api.h"
+
+static size_t ReadFile(const char *filename, const char **buffer_out) {
+  FILE *file = fopen(filename, "r");
+  if (file == NULL) {
+    fprintf(stderr, "Failed to open %s\n", filename);
+    return -1;
+  }
+  fseek(file, 0L, SEEK_END);
+  long size = ftell(file);
+  rewind(file);
+  *buffer_out = malloc(size);
+  if (*buffer_out == NULL) {
+    fclose(file);
+    fprintf(stderr, "Memory error\n");
+    return -1;
+  }
+  size_t read_bytes = fread(*buffer_out, 1, size, file);
+  if (read_bytes != size) {
+    printf("Errors occured in reading the file %s\n", filename);
+    free((void *)*buffer_out);
+    *buffer_out = NULL;
+    fclose(file);
+    return -1;
+  }
+  fclose(file);
+  return read_bytes;
+}
+
+int32_t main() {
+  const char *wav_filename =
+      "sherpa-onnx-streaming-paraformer-bilingual-zh-en/test_wavs/0.wav";
+  const char *encoder_filename =
+      "sherpa-onnx-streaming-paraformer-bilingual-zh-en/encoder.int8.onnx";
+  const char *decoder_filename =
+      "sherpa-onnx-streaming-paraformer-bilingual-zh-en/decoder.int8.onnx";
+  const char *tokens_filename =
+      "sherpa-onnx-streaming-paraformer-bilingual-zh-en/tokens.txt";
+  const char *provider = "cpu";
+
+  const SherpaOnnxWave *wave = SherpaOnnxReadWave(wav_filename);
+  if (wave == NULL) {
+    fprintf(stderr, "Failed to read %s\n", wav_filename);
+    return -1;
+  }
+
+  // reading tokens and hotwords to buffers
+  const char *tokens_buf;
+  size_t token_buf_size = ReadFile(tokens_filename, &tokens_buf);
+  if (token_buf_size < 1) {
+    fprintf(stderr, "Please check your tokens.txt!\n");
+    free((void *)tokens_buf);
+    return -1;
+  }
+
+  // Paraformer config
+  SherpaOnnxOnlineParaformerModelConfig paraformer_config;
+  memset(&paraformer_config, 0, sizeof(paraformer_config));
+  paraformer_config.encoder = encoder_filename;
+  paraformer_config.decoder = decoder_filename;
+
+  // Online model config
+  SherpaOnnxOnlineModelConfig online_model_config;
+  memset(&online_model_config, 0, sizeof(online_model_config));
+  online_model_config.debug = 1;
+  online_model_config.num_threads = 1;
+  online_model_config.provider = provider;
+  online_model_config.tokens_buf = tokens_buf;
+  online_model_config.tokens_buf_size = token_buf_size;
+  online_model_config.paraformer = paraformer_config;
+
+  // Recognizer config
+  SherpaOnnxOnlineRecognizerConfig recognizer_config;
+  memset(&recognizer_config, 0, sizeof(recognizer_config));
+  recognizer_config.decoding_method = "greedy_search";
+  recognizer_config.model_config = online_model_config;
+
+  SherpaOnnxOnlineRecognizer *recognizer =
+      SherpaOnnxCreateOnlineRecognizer(&recognizer_config);
+
+  free((void *)tokens_buf);
+  tokens_buf = NULL;
+
+  if (recognizer == NULL) {
+    fprintf(stderr, "Please check your config!\n");
+    SherpaOnnxFreeWave(wave);
+    return -1;
+  }
+
+  SherpaOnnxOnlineStream *stream = SherpaOnnxCreateOnlineStream(recognizer);
+
+  const SherpaOnnxDisplay *display = SherpaOnnxCreateDisplay(50);
+  int32_t segment_id = 0;
+
+// simulate streaming. You can choose an arbitrary N
+#define N 3200
+
+  fprintf(stderr, "sample rate: %d, num samples: %d, duration: %.2f s\n",
+          wave->sample_rate, wave->num_samples,
+          (float)wave->num_samples / wave->sample_rate);
+
+  int32_t k = 0;
+  while (k < wave->num_samples) {
+    int32_t start = k;
+    int32_t end =
+        (start + N > wave->num_samples) ? wave->num_samples : (start + N);
+    k += N;
+
+    SherpaOnnxOnlineStreamAcceptWaveform(stream, wave->sample_rate,
+                                         wave->samples + start, end - start);
+    while (SherpaOnnxIsOnlineStreamReady(recognizer, stream)) {
+      SherpaOnnxDecodeOnlineStream(recognizer, stream);
+    }
+
+    const SherpaOnnxOnlineRecognizerResult *r =
+        SherpaOnnxGetOnlineStreamResult(recognizer, stream);
+
+    if (strlen(r->text)) {
+      SherpaOnnxPrint(display, segment_id, r->text);
+    }
+
+    if (SherpaOnnxOnlineStreamIsEndpoint(recognizer, stream)) {
+      if (strlen(r->text)) {
+        ++segment_id;
+      }
+      SherpaOnnxOnlineStreamReset(recognizer, stream);
+    }
+
+    SherpaOnnxDestroyOnlineRecognizerResult(r);
+  }
+
+  // add some tail padding
+  float tail_paddings[4800] = {0};  // 0.3 seconds at 16 kHz sample rate
+  SherpaOnnxOnlineStreamAcceptWaveform(stream, wave->sample_rate, tail_paddings,
+                                       4800);
+
+  SherpaOnnxFreeWave(wave);
+
+  SherpaOnnxOnlineStreamInputFinished(stream);
+  while (SherpaOnnxIsOnlineStreamReady(recognizer, stream)) {
+    SherpaOnnxDecodeOnlineStream(recognizer, stream);
+  }
+
+  const SherpaOnnxOnlineRecognizerResult *r =
+      SherpaOnnxGetOnlineStreamResult(recognizer, stream);
+
+  if (strlen(r->text)) {
+    SherpaOnnxPrint(display, segment_id, r->text);
+  }
+
+  SherpaOnnxDestroyOnlineRecognizerResult(r);
+
+  SherpaOnnxDestroyDisplay(display);
+  SherpaOnnxDestroyOnlineStream(stream);
+  SherpaOnnxDestroyOnlineRecognizer(recognizer);
+  fprintf(stderr, "\n");
+
+  return 0;
+}

c-api-examples/streaming-zipformer-buffered-tokens-hotwords-c-api.c

@@ -5,7 +5,7 @@
 
 //
 // This file demonstrates how to use streaming Zipformer with sherpa-onnx's C
-// and with tokens and hotwords loaded from buffered strings instead of from
+// API and with tokens and hotwords loaded from buffered strings instead of from
 // external files API.
 // clang-format off
 // 

sherpa-onnx/csrc/online-recognizer-ctc-impl.h

@@ -71,8 +71,14 @@ class OnlineRecognizerCtcImpl : public OnlineRecognizerImpl {
       : OnlineRecognizerImpl(config),
         config_(config),
         model_(OnlineCtcModel::Create(config.model_config)),
-        sym_(config.model_config.tokens),
         endpoint_(config_.endpoint_config) {
+    if (!config.model_config.tokens_buf.empty()) {
+      sym_ = SymbolTable(config.model_config.tokens_buf, false);
+    } else {
+      /// assuming tokens_buf and tokens are guaranteed not being both empty
+      sym_ = SymbolTable(config.model_config.tokens, true);
+    }
+
     if (!config.model_config.wenet_ctc.model.empty()) {
       // WeNet CTC models assume input samples are in the range
       // [-32768, 32767], so we set normalize_samples to false