summaryrefslogtreecommitdiffstats
path: root/libavdevice/alsa.c
blob: 903ed9412899c20cadc135085fc054d8c0396fe0 (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
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
/*
 * ALSA input and output
 * Copyright (c) 2007 Luca Abeni ( lucabe72 email it )
 * Copyright (c) 2007 Benoit Fouet ( benoit fouet free fr )
 *
 * This file is part of FFmpeg.
 *
 * FFmpeg is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * FFmpeg 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with FFmpeg; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

/**
 * @file
 * ALSA input and output: common code
 * @author Luca Abeni ( lucabe72 email it )
 * @author Benoit Fouet ( benoit fouet free fr )
 * @author Nicolas George ( nicolas george normalesup org )
 */

#include <alsa/asoundlib.h>
#include "avdevice.h"
#include "libavutil/avassert.h"
#include "libavutil/channel_layout.h"

#include "alsa.h"

static av_cold snd_pcm_format_t codec_id_to_pcm_format(int codec_id)
{
    switch(codec_id) {
        case AV_CODEC_ID_PCM_F64LE: return SND_PCM_FORMAT_FLOAT64_LE;
        case AV_CODEC_ID_PCM_F64BE: return SND_PCM_FORMAT_FLOAT64_BE;
        case AV_CODEC_ID_PCM_F32LE: return SND_PCM_FORMAT_FLOAT_LE;
        case AV_CODEC_ID_PCM_F32BE: return SND_PCM_FORMAT_FLOAT_BE;
        case AV_CODEC_ID_PCM_S32LE: return SND_PCM_FORMAT_S32_LE;
        case AV_CODEC_ID_PCM_S32BE: return SND_PCM_FORMAT_S32_BE;
        case AV_CODEC_ID_PCM_U32LE: return SND_PCM_FORMAT_U32_LE;
        case AV_CODEC_ID_PCM_U32BE: return SND_PCM_FORMAT_U32_BE;
        case AV_CODEC_ID_PCM_S24LE: return SND_PCM_FORMAT_S24_3LE;
        case AV_CODEC_ID_PCM_S24BE: return SND_PCM_FORMAT_S24_3BE;
        case AV_CODEC_ID_PCM_U24LE: return SND_PCM_FORMAT_U24_3LE;
        case AV_CODEC_ID_PCM_U24BE: return SND_PCM_FORMAT_U24_3BE;
        case AV_CODEC_ID_PCM_S16LE: return SND_PCM_FORMAT_S16_LE;
        case AV_CODEC_ID_PCM_S16BE: return SND_PCM_FORMAT_S16_BE;
        case AV_CODEC_ID_PCM_U16LE: return SND_PCM_FORMAT_U16_LE;
        case AV_CODEC_ID_PCM_U16BE: return SND_PCM_FORMAT_U16_BE;
        case AV_CODEC_ID_PCM_S8:    return SND_PCM_FORMAT_S8;
        case AV_CODEC_ID_PCM_U8:    return SND_PCM_FORMAT_U8;
        case AV_CODEC_ID_PCM_MULAW: return SND_PCM_FORMAT_MU_LAW;
        case AV_CODEC_ID_PCM_ALAW:  return SND_PCM_FORMAT_A_LAW;
        default:                 return SND_PCM_FORMAT_UNKNOWN;
    }
}

#define MAKE_REORDER_FUNC(NAME, TYPE, CHANNELS, LAYOUT, MAP)                \
static void alsa_reorder_ ## NAME ## _ ## LAYOUT(const void *in_v,          \
                                                 void *out_v,               \
                                                 int n)                     \
{                                                                           \
    const TYPE *in = in_v;                                                  \
    TYPE      *out = out_v;                                                 \
                                                                            \
    while (n-- > 0) {                                                       \
        MAP                                                                 \
        in  += CHANNELS;                                                    \
        out += CHANNELS;                                                    \
    }                                                                       \
}

#define MAKE_REORDER_FUNCS(CHANNELS, LAYOUT, MAP) \
    MAKE_REORDER_FUNC(int8,  int8_t,  CHANNELS, LAYOUT, MAP) \
    MAKE_REORDER_FUNC(int16, int16_t, CHANNELS, LAYOUT, MAP) \
    MAKE_REORDER_FUNC(int32, int32_t, CHANNELS, LAYOUT, MAP) \
    MAKE_REORDER_FUNC(f32,   float,   CHANNELS, LAYOUT, MAP)

MAKE_REORDER_FUNCS(5, out_50, \
        out[0] = in[0]; \
        out[1] = in[1]; \
        out[2] = in[3]; \
        out[3] = in[4]; \
        out[4] = in[2]; \
        )

MAKE_REORDER_FUNCS(6, out_51, \
        out[0] = in[0]; \
        out[1] = in[1]; \
        out[2] = in[4]; \
        out[3] = in[5]; \
        out[4] = in[2]; \
        out[5] = in[3]; \
        )

MAKE_REORDER_FUNCS(8, out_71, \
        out[0] = in[0]; \
        out[1] = in[1]; \
        out[2] = in[4]; \
        out[3] = in[5]; \
        out[4] = in[2]; \
        out[5] = in[3]; \
        out[6] = in[6]; \
        out[7] = in[7]; \
        )

#define FORMAT_I8  0
#define FORMAT_I16 1
#define FORMAT_I32 2
#define FORMAT_F32 3

#define PICK_REORDER(layout)\
switch(format) {\
    case FORMAT_I8:  s->reorder_func = alsa_reorder_int8_out_ ##layout;  break;\
    case FORMAT_I16: s->reorder_func = alsa_reorder_int16_out_ ##layout; break;\
    case FORMAT_I32: s->reorder_func = alsa_reorder_int32_out_ ##layout; break;\
    case FORMAT_F32: s->reorder_func = alsa_reorder_f32_out_ ##layout;   break;\
}

static av_cold int find_reorder_func(AlsaData *s, int codec_id, uint64_t layout, int out)
{
    int format;

    /* reordering input is not currently supported */
    if (!out)
        return AVERROR(ENOSYS);

    /* reordering is not needed for QUAD or 2_2 layout */
    if (layout == AV_CH_LAYOUT_QUAD || layout == AV_CH_LAYOUT_2_2)
        return 0;

    switch (codec_id) {
    case AV_CODEC_ID_PCM_S8:
    case AV_CODEC_ID_PCM_U8:
    case AV_CODEC_ID_PCM_ALAW:
    case AV_CODEC_ID_PCM_MULAW: format = FORMAT_I8;  break;
    case AV_CODEC_ID_PCM_S16LE:
    case AV_CODEC_ID_PCM_S16BE:
    case AV_CODEC_ID_PCM_U16LE:
    case AV_CODEC_ID_PCM_U16BE: format = FORMAT_I16; break;
    case AV_CODEC_ID_PCM_S32LE:
    case AV_CODEC_ID_PCM_S32BE:
    case AV_CODEC_ID_PCM_U32LE:
    case AV_CODEC_ID_PCM_U32BE: format = FORMAT_I32; break;
    case AV_CODEC_ID_PCM_F32LE:
    case AV_CODEC_ID_PCM_F32BE: format = FORMAT_F32; break;
    default:                 return AVERROR(ENOSYS);
    }

    if      (layout == AV_CH_LAYOUT_5POINT0_BACK || layout == AV_CH_LAYOUT_5POINT0)
        PICK_REORDER(50)
    else if (layout == AV_CH_LAYOUT_5POINT1_BACK || layout == AV_CH_LAYOUT_5POINT1)
        PICK_REORDER(51)
    else if (layout == AV_CH_LAYOUT_7POINT1)
        PICK_REORDER(71)

    return s->reorder_func ? 0 : AVERROR(ENOSYS);
}

av_cold int ff_alsa_open(AVFormatContext *ctx, snd_pcm_stream_t mode,
                         unsigned int *sample_rate,
                         int channels, enum AVCodecID *codec_id)
{
    AlsaData *s = ctx->priv_data;
    const char *audio_device;
    int res, flags = 0;
    snd_pcm_format_t format;
    snd_pcm_t *h;
    snd_pcm_hw_params_t *hw_params;
    snd_pcm_sw_params_t *sw_params;
    snd_pcm_status_t *alsa_pcm_status;
    snd_pcm_uframes_t buffer_size, period_size;
    uint64_t layout = ctx->streams[0]->codecpar->channel_layout;

    if (ctx->url[0] == 0) audio_device = "default";
    else                  audio_device = ctx->url;

    if (*codec_id == AV_CODEC_ID_NONE)
        *codec_id = DEFAULT_CODEC_ID;
    format = codec_id_to_pcm_format(*codec_id);
    if (format == SND_PCM_FORMAT_UNKNOWN) {
        av_log(ctx, AV_LOG_ERROR, "sample format 0x%04x is not supported\n", *codec_id);
        return AVERROR(ENOSYS);
    }
    s->frame_size = av_get_bits_per_sample(*codec_id) / 8 * channels;

    if (ctx->flags & AVFMT_FLAG_NONBLOCK) {
        flags = SND_PCM_NONBLOCK;
    }
    res = snd_pcm_open(&h, audio_device, mode, flags);
    if (res < 0) {
        av_log(ctx, AV_LOG_ERROR, "cannot open audio device %s (%s)\n",
               audio_device, snd_strerror(res));
        return AVERROR(EIO);
    }

    res = snd_pcm_hw_params_malloc(&hw_params);
    if (res < 0) {
        av_log(ctx, AV_LOG_ERROR, "cannot allocate hardware parameter structure (%s)\n",
               snd_strerror(res));
        goto fail1;
    }

    res = snd_pcm_hw_params_any(h, hw_params);
    if (res < 0) {
        av_log(ctx, AV_LOG_ERROR, "cannot initialize hardware parameter structure (%s)\n",
               snd_strerror(res));
        goto fail;
    }

    res = snd_pcm_hw_params_set_access(h, hw_params, SND_PCM_ACCESS_RW_INTERLEAVED);
    if (res < 0) {
        av_log(ctx, AV_LOG_ERROR, "cannot set access type (%s)\n",
               snd_strerror(res));
        goto fail;
    }

    res = snd_pcm_hw_params_set_format(h, hw_params, format);
    if (res < 0) {
        av_log(ctx, AV_LOG_ERROR, "cannot set sample format 0x%04x %d (%s)\n",
               *codec_id, format, snd_strerror(res));
        goto fail;
    }

    res = snd_pcm_hw_params_set_rate_near(h, hw_params, sample_rate, 0);
    if (res < 0) {
        av_log(ctx, AV_LOG_ERROR, "cannot set sample rate (%s)\n",
               snd_strerror(res));
        goto fail;
    }

    res = snd_pcm_hw_params_set_channels(h, hw_params, channels);
    if (res < 0) {
        av_log(ctx, AV_LOG_ERROR, "cannot set channel count to %d (%s)\n",
               channels, snd_strerror(res));
        goto fail;
    }

    snd_pcm_hw_params_get_buffer_size_max(hw_params, &buffer_size);
    buffer_size = FFMIN(buffer_size, ALSA_BUFFER_SIZE_MAX);
    /* TODO: maybe use ctx->max_picture_buffer somehow */
    res = snd_pcm_hw_params_set_buffer_size_near(h, hw_params, &buffer_size);
    if (res < 0) {
        av_log(ctx, AV_LOG_ERROR, "cannot set ALSA buffer size (%s)\n",
               snd_strerror(res));
        goto fail;
    }

    snd_pcm_hw_params_get_period_size_min(hw_params, &period_size, NULL);
    if (!period_size)
        period_size = buffer_size / 4;
    res = snd_pcm_hw_params_set_period_size_near(h, hw_params, &period_size, NULL);
    if (res < 0) {
        av_log(ctx, AV_LOG_ERROR, "cannot set ALSA period size (%s)\n",
               snd_strerror(res));
        goto fail;
    }
    s->period_size = period_size;

    res = snd_pcm_hw_params(h, hw_params);
    if (res < 0) {
        av_log(ctx, AV_LOG_ERROR, "cannot set parameters (%s)\n",
               snd_strerror(res));
        goto fail;
    }

    s->use_driver_timestamps = 0;
#if HAVE_ALSA_HR_TS
    if (snd_pcm_hw_params_supports_audio_ts_type(hw_params, 0)) {
        av_log(ctx, AV_LOG_INFO, "capture device supports compat timestamps\n");
        s->use_driver_timestamps |= 1;
    }
    if (snd_pcm_hw_params_supports_audio_ts_type(hw_params, 1)) {
        av_log(ctx, AV_LOG_INFO, "capture device supports default timestamps\n");
        s->use_driver_timestamps |= 2;
    }
    if (snd_pcm_hw_params_supports_audio_ts_type(hw_params, 2)) {
        av_log(ctx, AV_LOG_INFO, "capture device supports link timestamps\n");
        s->use_driver_timestamps |= 4;
    }
    if (snd_pcm_hw_params_supports_audio_ts_type(hw_params, 3)) {
        av_log(ctx, AV_LOG_INFO, "capture device supports link absolute timestamps\n");
        s->use_driver_timestamps |= 8;
    }
    if (snd_pcm_hw_params_supports_audio_ts_type(hw_params, 4)) {
        av_log(ctx, AV_LOG_INFO, "capture device supports link estimated timestamps\n");
        s->use_driver_timestamps |= 16;
    }
    if (snd_pcm_hw_params_supports_audio_ts_type(hw_params, 5)) {
        av_log(ctx, AV_LOG_INFO, "capture device supports link synchronized timestamps\n");
        s->use_driver_timestamps |= 32;
    }
#endif

    res = snd_pcm_sw_params_malloc(&sw_params);
    if (res < 0) {
        av_log(ctx, AV_LOG_ERROR, "cannot allocate software parameter structure (%s)\n",
               snd_strerror(res));
        goto fail;
    }

    res = snd_pcm_sw_params_current(h, sw_params);
    if (res < 0) {
        av_log(ctx, AV_LOG_ERROR, "cannot read parameters from device (%s)\n",
               snd_strerror(res));
        snd_pcm_sw_params_free(sw_params);
        goto fail;
    }

    res = snd_pcm_sw_params_set_tstamp_mode(h, sw_params, SND_PCM_TSTAMP_ENABLE);
    if (res < 0) {
        av_log(ctx, AV_LOG_ERROR, "cannot enable timestamps (%s)\n",
               snd_strerror(res));
        snd_pcm_sw_params_free(sw_params);
        goto fail;
    }

#if HAVE_ALSA_HR_TS
    res = snd_pcm_sw_params_set_tstamp_type(h, sw_params, SND_PCM_TSTAMP_TYPE_MONOTONIC_RAW);
    if (res < 0) {
        av_log(ctx, AV_LOG_ERROR, "cannot set timestamp mode (%s)\n",
               snd_strerror(res));
        snd_pcm_sw_params_free(sw_params);
        goto fail;
    }
#endif

    res = snd_pcm_sw_params(h, sw_params);
    if (res < 0) {
        av_log(ctx, AV_LOG_ERROR, "cannot set parameters (%s)\n",
               snd_strerror(res));
        snd_pcm_sw_params_free(sw_params);
        goto fail;
    }

    snd_pcm_sw_params_free(sw_params);
    snd_pcm_hw_params_free(hw_params);

    if (channels > 2 && layout) {
        if (find_reorder_func(s, *codec_id, layout, mode == SND_PCM_STREAM_PLAYBACK) < 0) {
            char name[128];
            av_get_channel_layout_string(name, sizeof(name), channels, layout);
            av_log(ctx, AV_LOG_WARNING, "ALSA channel layout unknown or unimplemented for %s %s.\n",
                   name, mode == SND_PCM_STREAM_PLAYBACK ? "playback" : "capture");
        }
        if (s->reorder_func) {
            s->reorder_buf_size = buffer_size;
            s->reorder_buf = av_malloc_array(s->reorder_buf_size, s->frame_size);
            if (!s->reorder_buf)
                goto fail1;
        }
    }

    snd_pcm_status_malloc(&alsa_pcm_status);

    s->h = h;
    s->st = alsa_pcm_status;
    return 0;

fail:
    snd_pcm_hw_params_free(hw_params);
fail1:
    snd_pcm_close(h);
    return AVERROR(EIO);
}

av_cold int ff_alsa_close(AVFormatContext *s1)
{
    AlsaData *s = s1->priv_data;

    if (snd_pcm_stream(s->h) == SND_PCM_STREAM_PLAYBACK) {
        snd_pcm_nonblock(s->h, 0);
        snd_pcm_drain(s->h);
    }
    av_freep(&s->reorder_buf);
    if (CONFIG_ALSA_INDEV)
        ff_timefilter_destroy(s->timefilter);
    snd_pcm_close(s->h);
    snd_pcm_status_free(s->st);
    return 0;
}

int ff_alsa_xrun_recover(AVFormatContext *s1, int err)
{
    AlsaData *s = s1->priv_data;
    snd_pcm_t *handle = s->h;

    av_log(s1, AV_LOG_WARNING, "ALSA buffer xrun.\n");
    if (err == -EPIPE) {
        err = snd_pcm_prepare(handle);
        if (err < 0) {
            av_log(s1, AV_LOG_ERROR, "cannot recover from underrun (snd_pcm_prepare failed: %s)\n", snd_strerror(err));

            return AVERROR(EIO);
        }
    } else if (err == -ESTRPIPE) {
        av_log(s1, AV_LOG_ERROR, "-ESTRPIPE... Unsupported!\n");

        return -1;
    }
    return err;
}

int ff_alsa_extend_reorder_buf(AlsaData *s, int min_size)
{
    int size = s->reorder_buf_size;
    void *r;

    av_assert0(size != 0);
    while (size < min_size)
        size *= 2;
    r = av_realloc_array(s->reorder_buf, size, s->frame_size);
    if (!r)
        return AVERROR(ENOMEM);
    s->reorder_buf = r;
    s->reorder_buf_size = size;
    return 0;
}

/* ported from alsa-utils/aplay.c */
int ff_alsa_get_device_list(AVDeviceInfoList *device_list, snd_pcm_stream_t stream_type)
{
    int ret = 0;
    void **hints, **n;
    char *name = NULL, *descr = NULL, *io = NULL, *tmp;
    AVDeviceInfo *new_device = NULL;
    const char *filter = stream_type == SND_PCM_STREAM_PLAYBACK ? "Output" : "Input";

    if (snd_device_name_hint(-1, "pcm", &hints) < 0)
        return AVERROR_EXTERNAL;
    n = hints;
    while (*n && !ret) {
        name = snd_device_name_get_hint(*n, "NAME");
        descr = snd_device_name_get_hint(*n, "DESC");
        io = snd_device_name_get_hint(*n, "IOID");
        if (!io || !strcmp(io, filter)) {
            new_device = av_mallocz(sizeof(AVDeviceInfo));
            if (!new_device) {
                ret = AVERROR(ENOMEM);
                goto fail;
            }
            new_device->device_name = av_strdup(name);
            if ((tmp = strrchr(descr, '\n')) && tmp[1])
                new_device->device_description = av_strdup(&tmp[1]);
            else
                new_device->device_description = av_strdup(descr);
            if (!new_device->device_description || !new_device->device_name) {
                ret = AVERROR(ENOMEM);
                goto fail;
            }
            if ((ret = av_dynarray_add_nofree(&device_list->devices,
                                              &device_list->nb_devices, new_device)) < 0) {
                goto fail;
            }
            if (!strcmp(new_device->device_name, "default"))
                device_list->default_device = device_list->nb_devices - 1;
            new_device = NULL;
        }
      fail:
        free(io);
        free(name);
        free(descr);
        n++;
    }
    if (new_device) {
        av_free(new_device->device_description);
        av_free(new_device->device_name);
        av_free(new_device);
    }
    snd_device_name_free_hint(hints);
    return ret;
}
OpenPOWER on IntegriCloud