/* Copyright (C) 2020 dec05eba This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program. If not, see . */ #include "../include/sound.hpp" #include #include #include #include #include #include #include #include #include #define CHECK_DEAD_GOTO(p, rerror, label) \ do { \ if (!(p)->context || !PA_CONTEXT_IS_GOOD(pa_context_get_state((p)->context)) || \ !(p)->stream || !PA_STREAM_IS_GOOD(pa_stream_get_state((p)->stream))) { \ if (((p)->context && pa_context_get_state((p)->context) == PA_CONTEXT_FAILED) || \ ((p)->stream && pa_stream_get_state((p)->stream) == PA_STREAM_FAILED)) { \ if (rerror) \ *(rerror) = pa_context_errno((p)->context); \ } else \ if (rerror) \ *(rerror) = PA_ERR_BADSTATE; \ goto label; \ } \ } while(false); static double clock_get_monotonic_seconds() { struct timespec ts; ts.tv_sec = 0; ts.tv_nsec = 0; clock_gettime(CLOCK_MONOTONIC, &ts); return (double)ts.tv_sec + (double)ts.tv_nsec * 0.000000001; } struct pa_handle { pa_context *context; pa_stream *stream; pa_mainloop *mainloop; const void *read_data; size_t read_index, read_length; uint8_t *output_data; size_t output_index, output_length; int operation_success; }; static void pa_sound_device_free(pa_handle *s) { assert(s); if (s->stream) pa_stream_unref(s->stream); if (s->context) { pa_context_disconnect(s->context); pa_context_unref(s->context); } if (s->mainloop) pa_mainloop_free(s->mainloop); if (s->output_data) { free(s->output_data); s->output_data = NULL; } pa_xfree(s); } static pa_handle* pa_sound_device_new(const char *server, const char *name, const char *dev, const char *stream_name, const pa_sample_spec *ss, const pa_buffer_attr *attr, int *rerror) { pa_handle *p; int error = PA_ERR_INTERNAL, r; p = pa_xnew0(pa_handle, 1); p->read_data = NULL; p->read_length = 0; p->read_index = 0; const int buffer_size = attr->maxlength; void *buffer = malloc(buffer_size); if(!buffer) { fprintf(stderr, "failed to allocate buffer for audio\n"); *rerror = -1; return NULL; } p->output_data = (uint8_t*)buffer; p->output_length = buffer_size; p->output_index = 0; if (!(p->mainloop = pa_mainloop_new())) goto fail; if (!(p->context = pa_context_new(pa_mainloop_get_api(p->mainloop), name))) goto fail; if (pa_context_connect(p->context, server, PA_CONTEXT_NOFLAGS, NULL) < 0) { error = pa_context_errno(p->context); goto fail; } for (;;) { pa_context_state_t state = pa_context_get_state(p->context); if (state == PA_CONTEXT_READY) break; if (!PA_CONTEXT_IS_GOOD(state)) { error = pa_context_errno(p->context); goto fail; } pa_mainloop_iterate(p->mainloop, 1, NULL); } if (!(p->stream = pa_stream_new(p->context, stream_name, ss, NULL))) { error = pa_context_errno(p->context); goto fail; } r = pa_stream_connect_record(p->stream, dev, attr, (pa_stream_flags_t)(PA_STREAM_INTERPOLATE_TIMING|PA_STREAM_ADJUST_LATENCY|PA_STREAM_AUTO_TIMING_UPDATE)); if (r < 0) { error = pa_context_errno(p->context); goto fail; } for (;;) { pa_stream_state_t state = pa_stream_get_state(p->stream); if (state == PA_STREAM_READY) break; if (!PA_STREAM_IS_GOOD(state)) { error = pa_context_errno(p->context); goto fail; } pa_mainloop_iterate(p->mainloop, 1, NULL); } return p; fail: if (rerror) *rerror = error; pa_sound_device_free(p); return NULL; } // Returns a negative value on failure or if |p->output_length| data is not available within the time frame specified by the sample rate static int pa_sound_device_read(pa_handle *p) { assert(p); const int64_t timeout_ms = std::round((1000.0 / (double)pa_stream_get_sample_spec(p->stream)->rate) * 1000.0); const double start_time = clock_get_monotonic_seconds(); bool success = false; int r = 0; int *rerror = &r; CHECK_DEAD_GOTO(p, rerror, fail); while (p->output_index < p->output_length) { if((clock_get_monotonic_seconds() - start_time) * 1000 >= timeout_ms) return -1; if(p->read_data) { assert(p->output_index == 0); memcpy(p->output_data, (const uint8_t*)p->read_data + p->read_index, p->read_length); p->output_index += p->read_length; p->read_data = NULL; p->read_length = 0; p->read_index = 0; if(pa_stream_drop(p->stream) != 0) goto fail; } pa_mainloop_prepare(p->mainloop, 1 * 1000); // 1 ms pa_mainloop_poll(p->mainloop); pa_mainloop_dispatch(p->mainloop); if(pa_stream_peek(p->stream, &p->read_data, &p->read_length) < 0) goto fail; if(!p->read_data && p->read_length == 0) continue; if(!p->read_data && p->read_length > 0) { // There is a hole in the stream :( drop it. Maybe we should generate silence instead? TODO if(pa_stream_drop(p->stream) != 0) goto fail; continue; } if(p->read_length <= 0) { CHECK_DEAD_GOTO(p, rerror, fail); continue; } const size_t space_free_in_output_buffer = p->output_length - p->output_index; if(space_free_in_output_buffer < p->read_length) { assert(p->read_index == 0); memcpy(p->output_data + p->output_index, p->read_data, space_free_in_output_buffer); p->output_index = 0; p->read_index += space_free_in_output_buffer; p->read_length -= space_free_in_output_buffer; break; } else { assert(p->read_index == 0); memcpy(p->output_data + p->output_index, p->read_data, p->read_length); p->output_index += p->read_length; p->read_data = NULL; p->read_length = 0; p->read_index = 0; if(pa_stream_drop(p->stream) != 0) goto fail; if(p->output_index == p->output_length) { p->output_index = 0; break; } } } success = true; fail: return success ? 0 : -1; } int sound_device_get_by_name(SoundDevice *device, const char *name, unsigned int num_channels, unsigned int period_frame_size) { pa_sample_spec ss; ss.format = PA_SAMPLE_S16LE; ss.rate = 48000; ss.channels = num_channels; int error; pa_buffer_attr buffer_attr; buffer_attr.tlength = -1; buffer_attr.prebuf = -1; buffer_attr.minreq = -1; buffer_attr.maxlength = period_frame_size * 2 * num_channels; // 2 bytes/sample, @num_channels channels buffer_attr.fragsize = buffer_attr.maxlength; // We want a unique stream name for every device which allows each input to be a different box in pipewire graph software char stream_name[1024]; snprintf(stream_name, sizeof(stream_name), "gpu-screen-recorder-%s", name); pa_handle *handle = pa_sound_device_new(nullptr, stream_name, name, stream_name, &ss, &buffer_attr, &error); if(!handle) { fprintf(stderr, "pa_simple_new() failed: %s. Audio input device %s might not be valid\n", pa_strerror(error), name); return -1; } device->handle = handle; device->frames = period_frame_size; return 0; } void sound_device_close(SoundDevice *device) { pa_sound_device_free((pa_handle*)device->handle); } int sound_device_read_next_chunk(SoundDevice *device, void **buffer) { pa_handle *pa = (pa_handle*)device->handle; if(pa_sound_device_read(pa) < 0) { //fprintf(stderr, "pa_simple_read() failed: %s\n", pa_strerror(error)); return -1; } *buffer = pa->output_data; return device->frames; }