aboutsummaryrefslogtreecommitdiff
path: root/src/sound.cpp
blob: d0f2a80d68a1b3e56b2118423c7a3ab998009f81 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
#include "../include/sound.hpp"
extern "C" {
#include "../include/utils.h"
}

#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <cmath>
#include <time.h>

#include <pulse/pulseaudio.h>
#include <pulse/mainloop.h>
#include <pulse/xmalloc.h>
#include <pulse/error.h>

#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);

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;
    double latency_seconds;
};

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;
    p->latency_seconds = 0.0;

    const int buffer_size = attr->fragsize;
    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;
}

static int pa_sound_device_read(pa_handle *p, double timeout_seconds) {
    assert(p);

    const double start_time = clock_get_monotonic_seconds();

    bool success = false;
    int r = 0;
    int *rerror = &r;
    pa_usec_t latency = 0;
    int negative = 0;

    CHECK_DEAD_GOTO(p, rerror, fail);

    while (p->output_index < p->output_length) {
        if(clock_get_monotonic_seconds() - start_time >= timeout_seconds)
            return -1;

        if(!p->read_data) {
            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) {
                p->read_data = NULL;
                if(pa_stream_drop(p->stream) != 0)
                    goto fail;

                CHECK_DEAD_GOTO(p, rerror, fail);
                continue;
            }

            pa_operation_unref(pa_stream_update_timing_info(p->stream, NULL, NULL));
            // TODO: Deal with one pa_stream_peek not being enough. In that case we need to add multiple of these together(?)
            if(pa_stream_get_latency(p->stream, &latency, &negative) >= 0) {
                p->latency_seconds = negative ? -(double)latency : latency;
                if(p->latency_seconds < 0.0)
                    p->latency_seconds = 0.0;
                p->latency_seconds *= 0.0000001;
            }
        }

        const size_t space_free_in_output_buffer = p->output_length - p->output_index;
        if(space_free_in_output_buffer < p->read_length) {
            memcpy(p->output_data + p->output_index, (const uint8_t*)p->read_data + p->read_index, 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 {
            memcpy(p->output_data + p->output_index, (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;

            if(p->output_index == p->output_length) {
                p->output_index = 0;
                break;
            }
        }
    }

    success = true;

    fail:
    return success ? 0 : -1;
}

static pa_sample_format_t audio_format_to_pulse_audio_format(AudioFormat audio_format) {
    switch(audio_format) {
        case S16: return PA_SAMPLE_S16LE;
        case S32: return PA_SAMPLE_S32LE;
        case F32: return PA_SAMPLE_FLOAT32LE;
    }
    assert(false);
    return PA_SAMPLE_S16LE;
}

static int audio_format_to_get_bytes_per_sample(AudioFormat audio_format) {
    switch(audio_format) {
        case S16: return 2;
        case S32: return 4;
        case F32: return 4;
    }
    assert(false);
    return 2;
}

int sound_device_get_by_name(SoundDevice *device, const char *device_name, const char *description, unsigned int num_channels, unsigned int period_frame_size, AudioFormat audio_format) {
    pa_sample_spec ss;
    ss.format = audio_format_to_pulse_audio_format(audio_format);
    ss.rate = 48000;
    ss.channels = num_channels;

    pa_buffer_attr buffer_attr;
    buffer_attr.fragsize = period_frame_size * audio_format_to_get_bytes_per_sample(audio_format) * num_channels; // 2/4 bytes/sample, @num_channels channels
    buffer_attr.tlength = -1;
    buffer_attr.prebuf = -1;
    buffer_attr.minreq = -1;
    buffer_attr.maxlength = buffer_attr.fragsize;

    int error = 0;
    pa_handle *handle = pa_sound_device_new(nullptr, description, device_name, description, &ss, &buffer_attr, &error);
    if(!handle) {
        fprintf(stderr, "pa_sound_device_new() failed: %s. Audio input device %s might not be valid\n", pa_strerror(error), description);
        return -1;
    }

    device->handle = handle;
    device->frames = period_frame_size;
    return 0;
}

void sound_device_close(SoundDevice *device) {
    if(device->handle)
        pa_sound_device_free((pa_handle*)device->handle);
    device->handle = NULL;
}

int sound_device_read_next_chunk(SoundDevice *device, void **buffer, double timeout_sec, double *latency_seconds) {
    pa_handle *pa = (pa_handle*)device->handle;
    if(pa_sound_device_read(pa, timeout_sec) < 0) {
        //fprintf(stderr, "pa_simple_read() failed: %s\n", pa_strerror(error));
        *latency_seconds = 0.0;
        return -1;
    }
    *buffer = pa->output_data;
    *latency_seconds = pa->latency_seconds;
    return device->frames;
}

static void pa_state_cb(pa_context *c, void *userdata) {
    pa_context_state state = pa_context_get_state(c);
    int *pa_ready = (int*)userdata;
    switch(state) {
        case PA_CONTEXT_UNCONNECTED:
        case PA_CONTEXT_CONNECTING:
        case PA_CONTEXT_AUTHORIZING:
        case PA_CONTEXT_SETTING_NAME:
        default:
            break;
        case PA_CONTEXT_FAILED:
        case PA_CONTEXT_TERMINATED:
            *pa_ready = 2;
            break;
        case PA_CONTEXT_READY:
            *pa_ready = 1;
            break;
    }
}

static void pa_sourcelist_cb(pa_context *ctx, const pa_source_info *source_info, int eol, void *userdata) {
    (void)ctx;
    if(eol > 0)
        return;

    AudioDevices *audio_devices = (AudioDevices*)userdata;
    audio_devices->audio_inputs.push_back({ source_info->name, source_info->description });
}

static void pa_server_info_cb(pa_context*, const pa_server_info *server_info, void *userdata) {
    AudioDevices *audio_devices = (AudioDevices*)userdata;
    if(server_info->default_sink_name)
        audio_devices->default_output = std::string(server_info->default_sink_name) + ".monitor";
    if(server_info->default_source_name)
        audio_devices->default_input = server_info->default_source_name;
}

static void get_pulseaudio_default_inputs(AudioDevices &audio_devices) {
    pa_mainloop *main_loop = pa_mainloop_new();

    pa_context *ctx = pa_context_new(pa_mainloop_get_api(main_loop), "gpu-screen-recorder-gtk");
    pa_context_connect(ctx, NULL, PA_CONTEXT_NOFLAGS, NULL);
    int state = 0;
    int pa_ready = 0;
    pa_context_set_state_callback(ctx, pa_state_cb, &pa_ready);

    pa_operation *pa_op = NULL;

    for(;;) {
        // Not ready
        if(pa_ready == 0) {
            pa_mainloop_iterate(main_loop, 1, NULL);
            continue;
        }

        switch(state) {
            case 0: {
                pa_op = pa_context_get_server_info(ctx, pa_server_info_cb, &audio_devices);
                ++state;
                break;
            }
        }

        // Couldn't get connection to the server
        if(pa_ready == 2 || (state == 1 && pa_op && pa_operation_get_state(pa_op) == PA_OPERATION_DONE)) {
            if(pa_op)
                pa_operation_unref(pa_op);
            pa_context_disconnect(ctx);
            pa_context_unref(ctx);
            pa_mainloop_free(main_loop);
            return;
        }

        pa_mainloop_iterate(main_loop, 1, NULL);
    }

    pa_mainloop_free(main_loop);
}

AudioDevices get_pulseaudio_inputs() {
    AudioDevices audio_devices;

    // TODO: Do this in the same connection below instead of two separate connections
    get_pulseaudio_default_inputs(audio_devices);

    pa_mainloop *main_loop = pa_mainloop_new();

    pa_context *ctx = pa_context_new(pa_mainloop_get_api(main_loop), "gpu-screen-recorder");
    pa_context_connect(ctx, NULL, PA_CONTEXT_NOFLAGS, NULL);
    int state = 0;
    int pa_ready = 0;
    pa_context_set_state_callback(ctx, pa_state_cb, &pa_ready);

    pa_operation *pa_op = NULL;

    for(;;) {
        // Not ready
        if(pa_ready == 0) {
            pa_mainloop_iterate(main_loop, 1, NULL);
            continue;
        }

        switch(state) {
            case 0: {
                pa_op = pa_context_get_source_info_list(ctx, pa_sourcelist_cb, &audio_devices);
                ++state;
                break;
            }
        }

        // Couldn't get connection to the server
        if(pa_ready == 2 || (state == 1 && pa_op && pa_operation_get_state(pa_op) == PA_OPERATION_DONE)) {
            if(pa_op)
                pa_operation_unref(pa_op);
            pa_context_disconnect(ctx);
            pa_context_unref(ctx);
            break;
        }

        pa_mainloop_iterate(main_loop, 1, NULL);
    }

    pa_mainloop_free(main_loop);
    return audio_devices;
}