examples: use -dev/--device and WHISPER_ARG_DEVICE

Align device selection naming with llama.cpp.

Author: Braulio

examples/cli/cli.cpp

@@ -77,6 +77,7 @@ struct whisper_params {
     bool log_score       = false;
     bool use_gpu         = true;
     bool flash_attn      = true;
+    int32_t gpu_device   = 0;
     bool suppress_nst    = false;
     bool carry_initial_prompt = false;
 
@@ -129,6 +130,10 @@ static char * requires_value_error(const std::string & arg) {
 }
 
 static bool whisper_params_parse(int argc, char ** argv, whisper_params & params) {
+    if (const char * env_device = std::getenv("WHISPER_ARG_DEVICE")) {
+        params.gpu_device = std::stoi(env_device);
+    }
+
     for (int i = 1; i < argc; i++) {
         std::string arg = argv[i];
 
@@ -195,6 +200,7 @@ static bool whisper_params_parse(int argc, char ** argv, whisper_params & params
         else if (arg == "-dtw"  || arg == "--dtw")                  { params.dtw             = ARGV_NEXT; }
         else if (arg == "-ls"   || arg == "--log-score")            { params.log_score       = true; }
         else if (arg == "-ng"   || arg == "--no-gpu")               { params.use_gpu         = false; }
+        else if (arg == "-dev"  || arg == "--device")               { params.gpu_device      = std::stoi(ARGV_NEXT); }
         else if (arg == "-fa"   || arg == "--flash-attn")           { params.flash_attn      = true; }
         else if (arg == "-nfa"  || arg == "--no-flash-attn")        { params.flash_attn      = false; }
         else if (arg == "-sns"  || arg == "--suppress-nst")         { params.suppress_nst    = true; }
@@ -276,6 +282,7 @@ static void whisper_print_usage(int /*argc*/, char ** argv, const whisper_params
     fprintf(stderr, "  -dtw MODEL --dtw MODEL            [%-7s] compute token-level timestamps\n",                 params.dtw.c_str());
     fprintf(stderr, "  -ls,       --log-score            [%-7s] log best decoder scores of tokens\n",              params.log_score?"true":"false");
     fprintf(stderr, "  -ng,       --no-gpu               [%-7s] disable GPU\n",                                    params.use_gpu ? "false" : "true");
+    fprintf(stderr, "  -dev N,    --device N             [%-7d] GPU device ID (default: 0)\n",                     params.gpu_device);
     fprintf(stderr, "  -fa,       --flash-attn           [%-7s] enable flash attention\n",                         params.flash_attn ? "true" : "false");
     fprintf(stderr, "  -nfa,      --no-flash-attn        [%-7s] disable flash attention\n",                        params.flash_attn ? "false" : "true");
     fprintf(stderr, "  -sns,      --suppress-nst         [%-7s] suppress non-speech tokens\n",                     params.suppress_nst ? "true" : "false");
@@ -1003,6 +1010,7 @@ int main(int argc, char ** argv) {
     struct whisper_context_params cparams = whisper_context_default_params();
 
     cparams.use_gpu    = params.use_gpu;
+    cparams.gpu_device = params.gpu_device;
     cparams.flash_attn = params.flash_attn;
 
     if (!params.dtw.empty()) {

examples/server/server.cpp

@@ -102,6 +102,7 @@ struct whisper_params {
     bool no_timestamps   = false;
     bool use_gpu         = true;
     bool flash_attn      = true;
+    int32_t gpu_device   = 0;
     bool suppress_nst    = false;
     bool no_context      = true;
     bool no_language_probabilities = false;
@@ -177,6 +178,7 @@ void whisper_print_usage(int /*argc*/, char ** argv, const whisper_params & para
     fprintf(stderr, "  -sns,      --suppress-nst      [%-7s] suppress non-speech tokens\n", params.suppress_nst ? "true" : "false");
     fprintf(stderr, "  -nth N,    --no-speech-thold N [%-7.2f] no speech threshold\n",   params.no_speech_thold);
     fprintf(stderr, "  -ng,       --no-gpu            [%-7s] do not use gpu\n", params.use_gpu ? "false" : "true");
+    fprintf(stderr, "  -dev N,    --device N          [%-7d] GPU device ID (default: 0)\n", params.gpu_device);
     fprintf(stderr, "  -fa,       --flash-attn        [%-7s] enable flash attention\n", params.flash_attn ? "true" : "false");
     fprintf(stderr, "  -nfa,      --no-flash-attn     [%-7s] disable flash attention\n", params.flash_attn ? "false" : "true");
     fprintf(stderr, "  -nlp,      --no-language-probabilities [%-7s] exclude language probabilities from verbose_json output\n", params.no_language_probabilities ? "true" : "false");
@@ -196,6 +198,10 @@ void whisper_print_usage(int /*argc*/, char ** argv, const whisper_params & para
 }
 
 bool whisper_params_parse(int argc, char ** argv, whisper_params & params, server_params & sparams) {
+    if (const char * env_device = std::getenv("WHISPER_ARG_DEVICE")) {
+        params.gpu_device = std::stoi(env_device);
+    }
+
     for (int i = 1; i < argc; i++) {
         std::string arg = argv[i];
 
@@ -235,6 +241,7 @@ bool whisper_params_parse(int argc, char ** argv, whisper_params & params, serve
         else if (arg == "-oved" || arg == "--ov-e-device")     { params.openvino_encode_device = argv[++i]; }
         else if (arg == "-dtw"  || arg == "--dtw")             { params.dtw             = argv[++i]; }
         else if (arg == "-ng"   || arg == "--no-gpu")          { params.use_gpu         = false; }
+        else if (arg == "-dev"  || arg == "--device")          { params.gpu_device      = std::stoi(argv[++i]); }
         else if (arg == "-fa"   || arg == "--flash-attn")      { params.flash_attn      = true; }
         else if (arg == "-nfa"  || arg == "--no-flash-attn")   { params.flash_attn      = false; }
         else if (arg == "-sns"  || arg == "--suppress-nst")    { params.suppress_nst    = true; }
@@ -638,6 +645,7 @@ int main(int argc, char ** argv) {
     struct whisper_context_params cparams = whisper_context_default_params();
 
     cparams.use_gpu    = params.use_gpu;
+    cparams.gpu_device = params.gpu_device;
     cparams.flash_attn = params.flash_attn;
 
     if (!params.dtw.empty()) {