enne2/qwentts.cpp
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tts: add --stream-by-line, one utterance and one WAV header per line

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With -o '-', stdin is read line by line and every line synthesises
immediately as its own utterance, model and speaker staying resident
across lines. Each utterance after the first opens with a fresh RIFF
header, armed at end of line and consumed lazily at the next audio,
so a client can split the stream into standalone WAV clips on the
RIFF magic. Port of the feature contributed to omnivoice.cpp in
ServeurpersoCom/omnivoice.cpp#11.

Co-authored-by: Jeffrey van Binsbergen <comgenie@comgenie.com>
This commit is contained in:
Pascal
2026-06-06 23:13:46 +02:00
co-authored by Jeffrey van Binsbergen
parent ed8052eeb3
commit df66c67706
3 changed files with 118 additions and 34 deletions
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tools/qwen-tts.cpp
+87 -16
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@@ -31,7 +31,8 @@ static void print_usage(const char * prog) {
" --codec <gguf> Codec GGUF (qwen-tokenizer-*.gguf)\n"
" -o <path> Output WAV (24 kHz mono). '-' streams to stdout (pipe friendly).\n\n"
"Input:\n"
" stdin Target text to synthesise. Read fully then synthesised in one shot.\n\n"
" stdin Target text to synthesise. Read fully then synthesised in one\n"
" shot, or line by line with --stream-by-line.\n\n"
"Optional:\n"
" --format <fmt> WAV output format: wav16, wav24, wav32 (default: wav16)\n"
" --lang <name> Language label (default: auto)\n"
@@ -42,7 +43,8 @@ static void print_usage(const char * prog) {
" --ref-text <path> Transcript file for the reference (enables ICL clone mode)\n"
" --max-new <n> Max new audio frames (default: 2048)\n"
" --codec-chunk-dur <f> Codec decode chunk duration in seconds (default: 24.0)\n"
" --codec-left-dur <f> Codec decode left context duration in seconds (default: 2.0)\n\n"
" --codec-left-dur <f> Codec decode left context duration in seconds (default: 2.0)\n"
" --stream-by-line Flush synthesis at each newline, one WAV header per line (-o '-')\n\n"
"Sampling:\n"
" --seed <int> Sampling seed (default: -1 for random)\n"
" --greedy Disable stochastic sampling on both stacks\n"
@@ -84,6 +86,7 @@ struct Args {
bool subtalker_do_sample;
bool use_fa;
bool clamp_fp16;
bool stream_by_line;
float codec_chunk_sec;
float codec_left_context_sec;
};
@@ -145,6 +148,7 @@ static bool parse_args(int argc, char ** argv, Args & a) {
a.subtalker_temperature = 0.9f;
a.use_fa = true;
a.clamp_fp16 = false;
a.stream_by_line = false;
a.codec_chunk_sec = 24.0f;
a.codec_left_context_sec = 2.0f;
for (int i = 1; i < argc; i++) {
@@ -200,6 +204,8 @@ static bool parse_args(int argc, char ** argv, Args & a) {
a.use_fa = false;
} else if (std::strcmp(arg, "--clamp-fp16") == 0) {
a.clamp_fp16 = true;
} else if (std::strcmp(arg, "--stream-by-line") == 0) {
a.stream_by_line = true;
} else if (std::strcmp(arg, "--codec-chunk-dur") == 0 && i + 1 < argc) {
a.codec_chunk_sec = (float) std::atof(argv[++i]);
} else if (std::strcmp(arg, "--codec-left-dur") == 0 && i + 1 < argc) {
@@ -281,15 +287,28 @@ static int run(const Args & a) {
return 1;
}
// Streaming detection : -o '-' writes a wide RIFF header to stdout
// up front and pipes encoded samples chunk by chunk through the
// on_chunk callback as the AR loop produces frames. Any other path
// (or no -o) takes the buffered route so the file gets accurate
// sizes in its header.
const char * out_path = a.out_wav ? a.out_wav : "out.wav";
const bool stream_to_stdout = (out_path[0] == '-' && out_path[1] == '\0');
const bool line_mode = a.stream_by_line && stream_to_stdout;
// Resolve utterance text: read stdin fully. Empty stdin triggers a
// clean error. Inline text on the command line is intentionally not
// supported: shell quoting and special characters belong in a file
// or piped input, never in argv.
std::string text_buf = read_stdin_text();
if (text_buf.empty()) {
fprintf(stderr, "[CLI] ERROR: stdin is empty, nothing to synthesise\n");
qt_free(q);
return 1;
// or piped input, never in argv. Line mode reads stdin line by line
// in the streaming loop below instead.
std::string text_buf;
if (!line_mode) {
text_buf = read_stdin_text();
if (text_buf.empty()) {
fprintf(stderr, "[CLI] ERROR: stdin is empty, nothing to synthesise\n");
qt_free(q);
return 1;
}
}
const char * text = text_buf.c_str();
@@ -319,14 +338,6 @@ static int run(const Args & a) {
params.codec_chunk_sec = a.codec_chunk_sec;
params.codec_left_context_sec = a.codec_left_context_sec;
// Streaming detection : -o '-' writes a wide RIFF header to stdout
// up front and pipes encoded samples chunk by chunk through the
// on_chunk callback as the AR loop produces frames. Any other path
// (or no -o) takes the buffered route so the file gets accurate
// sizes in its header.
const char * out_path = a.out_wav ? a.out_wav : "out.wav";
const bool stream_to_stdout = (out_path[0] == '-' && out_path[1] == '\0');
if (stream_to_stdout) {
wav_stream ws = {};
if (!wav_stream_open_stdout(&ws, 24000, wav_fmt)) {
@@ -338,6 +349,66 @@ static int run(const Args & a) {
};
params.on_chunk_user_data = &ws;
if (line_mode) {
// Line oriented streaming: every stdin line synthesises
// immediately as its own utterance, model and speaker staying
// resident across lines. Each utterance after the first opens
// with a fresh RIFF header so a client can split the stream
// into one standalone WAV per line on the RIFF magic. The
// header is armed when a line completes and consumed lazily at
// the next synthesis, so empty lines and a trailing newline
// never emit an orphan header. Lines are text, an embedded NUL
// truncates the read at strlen.
char buf[4096];
std::string line;
bool need_header = false;
int n_lines = 0;
#if defined(_WIN32)
_setmode(_fileno(stdin), _O_BINARY);
#endif
while (true) {
const bool eof = (fgets(buf, sizeof(buf), stdin) == nullptr);
if (!eof) {
line += buf;
}
const bool complete = !line.empty() && line.back() == '\n';
if (complete || (eof && !line.empty())) {
while (!line.empty() && (line.back() == '\n' || line.back() == '\r')) {
line.pop_back();
}
if (!line.empty()) {
if (need_header) {
if (!wav_stream_write_header(&ws)) {
qt_free(q);
return 1;
}
need_header = false;
}
params.text = line.c_str();
qt_audio audio = {};
qt_status status = qt_synthesize(q, &params, &audio);
qt_audio_free(&audio);
if (status != QT_STATUS_OK) {
fprintf(stderr, "[CLI] ERROR: %s\n", qt_last_error());
wav_stream_close(&ws);
qt_free(q);
return 1;
}
n_lines++;
need_header = true;
}
line.clear();
}
if (eof) {
break;
}
}
wav_stream_close(&ws);
qt_free(q);
fprintf(stderr, "[Pipeline] Streamed %d lines to <stdout>\n", n_lines);
return 0;
}
qt_audio audio = {};
qt_status status = qt_synthesize(q, &params, &audio);
wav_stream_close(&ws);