GCC Code Coverage Report
Directory: ../../../ffmpeg/ Exec Total Coverage
File: src/libavdevice/alsa.c Lines: 0 199 0.0 %
Date: 2020-10-23 17:01:47 Branches: 0 149 0.0 %

Line Branch Exec Source
1
/*
2
 * ALSA input and output
3
 * Copyright (c) 2007 Luca Abeni ( lucabe72 email it )
4
 * Copyright (c) 2007 Benoit Fouet ( benoit fouet free fr )
5
 *
6
 * This file is part of FFmpeg.
7
 *
8
 * FFmpeg is free software; you can redistribute it and/or
9
 * modify it under the terms of the GNU Lesser General Public
10
 * License as published by the Free Software Foundation; either
11
 * version 2.1 of the License, or (at your option) any later version.
12
 *
13
 * FFmpeg is distributed in the hope that it will be useful,
14
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
16
 * Lesser General Public License for more details.
17
 *
18
 * You should have received a copy of the GNU Lesser General Public
19
 * License along with FFmpeg; if not, write to the Free Software
20
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21
 */
22
23
/**
24
 * @file
25
 * ALSA input and output: common code
26
 * @author Luca Abeni ( lucabe72 email it )
27
 * @author Benoit Fouet ( benoit fouet free fr )
28
 * @author Nicolas George ( nicolas george normalesup org )
29
 */
30
31
#include <alsa/asoundlib.h>
32
#include "avdevice.h"
33
#include "libavutil/avassert.h"
34
#include "libavutil/channel_layout.h"
35
36
#include "alsa.h"
37
38
static av_cold snd_pcm_format_t codec_id_to_pcm_format(int codec_id)
39
{
40
    switch(codec_id) {
41
        case AV_CODEC_ID_PCM_F64LE: return SND_PCM_FORMAT_FLOAT64_LE;
42
        case AV_CODEC_ID_PCM_F64BE: return SND_PCM_FORMAT_FLOAT64_BE;
43
        case AV_CODEC_ID_PCM_F32LE: return SND_PCM_FORMAT_FLOAT_LE;
44
        case AV_CODEC_ID_PCM_F32BE: return SND_PCM_FORMAT_FLOAT_BE;
45
        case AV_CODEC_ID_PCM_S32LE: return SND_PCM_FORMAT_S32_LE;
46
        case AV_CODEC_ID_PCM_S32BE: return SND_PCM_FORMAT_S32_BE;
47
        case AV_CODEC_ID_PCM_U32LE: return SND_PCM_FORMAT_U32_LE;
48
        case AV_CODEC_ID_PCM_U32BE: return SND_PCM_FORMAT_U32_BE;
49
        case AV_CODEC_ID_PCM_S24LE: return SND_PCM_FORMAT_S24_3LE;
50
        case AV_CODEC_ID_PCM_S24BE: return SND_PCM_FORMAT_S24_3BE;
51
        case AV_CODEC_ID_PCM_U24LE: return SND_PCM_FORMAT_U24_3LE;
52
        case AV_CODEC_ID_PCM_U24BE: return SND_PCM_FORMAT_U24_3BE;
53
        case AV_CODEC_ID_PCM_S16LE: return SND_PCM_FORMAT_S16_LE;
54
        case AV_CODEC_ID_PCM_S16BE: return SND_PCM_FORMAT_S16_BE;
55
        case AV_CODEC_ID_PCM_U16LE: return SND_PCM_FORMAT_U16_LE;
56
        case AV_CODEC_ID_PCM_U16BE: return SND_PCM_FORMAT_U16_BE;
57
        case AV_CODEC_ID_PCM_S8:    return SND_PCM_FORMAT_S8;
58
        case AV_CODEC_ID_PCM_U8:    return SND_PCM_FORMAT_U8;
59
        case AV_CODEC_ID_PCM_MULAW: return SND_PCM_FORMAT_MU_LAW;
60
        case AV_CODEC_ID_PCM_ALAW:  return SND_PCM_FORMAT_A_LAW;
61
        default:                 return SND_PCM_FORMAT_UNKNOWN;
62
    }
63
}
64
65
#define MAKE_REORDER_FUNC(NAME, TYPE, CHANNELS, LAYOUT, MAP)                \
66
static void alsa_reorder_ ## NAME ## _ ## LAYOUT(const void *in_v,          \
67
                                                 void *out_v,               \
68
                                                 int n)                     \
69
{                                                                           \
70
    const TYPE *in = in_v;                                                  \
71
    TYPE      *out = out_v;                                                 \
72
                                                                            \
73
    while (n-- > 0) {                                                       \
74
        MAP                                                                 \
75
        in  += CHANNELS;                                                    \
76
        out += CHANNELS;                                                    \
77
    }                                                                       \
78
}
79
80
#define MAKE_REORDER_FUNCS(CHANNELS, LAYOUT, MAP) \
81
    MAKE_REORDER_FUNC(int8,  int8_t,  CHANNELS, LAYOUT, MAP) \
82
    MAKE_REORDER_FUNC(int16, int16_t, CHANNELS, LAYOUT, MAP) \
83
    MAKE_REORDER_FUNC(int32, int32_t, CHANNELS, LAYOUT, MAP) \
84
    MAKE_REORDER_FUNC(f32,   float,   CHANNELS, LAYOUT, MAP)
85
86
MAKE_REORDER_FUNCS(5, out_50, \
87
        out[0] = in[0]; \
88
        out[1] = in[1]; \
89
        out[2] = in[3]; \
90
        out[3] = in[4]; \
91
        out[4] = in[2]; \
92
        )
93
94
MAKE_REORDER_FUNCS(6, out_51, \
95
        out[0] = in[0]; \
96
        out[1] = in[1]; \
97
        out[2] = in[4]; \
98
        out[3] = in[5]; \
99
        out[4] = in[2]; \
100
        out[5] = in[3]; \
101
        )
102
103
MAKE_REORDER_FUNCS(8, out_71, \
104
        out[0] = in[0]; \
105
        out[1] = in[1]; \
106
        out[2] = in[4]; \
107
        out[3] = in[5]; \
108
        out[4] = in[2]; \
109
        out[5] = in[3]; \
110
        out[6] = in[6]; \
111
        out[7] = in[7]; \
112
        )
113
114
#define FORMAT_I8  0
115
#define FORMAT_I16 1
116
#define FORMAT_I32 2
117
#define FORMAT_F32 3
118
119
#define PICK_REORDER(layout)\
120
switch(format) {\
121
    case FORMAT_I8:  s->reorder_func = alsa_reorder_int8_out_ ##layout;  break;\
122
    case FORMAT_I16: s->reorder_func = alsa_reorder_int16_out_ ##layout; break;\
123
    case FORMAT_I32: s->reorder_func = alsa_reorder_int32_out_ ##layout; break;\
124
    case FORMAT_F32: s->reorder_func = alsa_reorder_f32_out_ ##layout;   break;\
125
}
126
127
static av_cold int find_reorder_func(AlsaData *s, int codec_id, uint64_t layout, int out)
128
{
129
    int format;
130
131
    /* reordering input is not currently supported */
132
    if (!out)
133
        return AVERROR(ENOSYS);
134
135
    /* reordering is not needed for QUAD or 2_2 layout */
136
    if (layout == AV_CH_LAYOUT_QUAD || layout == AV_CH_LAYOUT_2_2)
137
        return 0;
138
139
    switch (codec_id) {
140
    case AV_CODEC_ID_PCM_S8:
141
    case AV_CODEC_ID_PCM_U8:
142
    case AV_CODEC_ID_PCM_ALAW:
143
    case AV_CODEC_ID_PCM_MULAW: format = FORMAT_I8;  break;
144
    case AV_CODEC_ID_PCM_S16LE:
145
    case AV_CODEC_ID_PCM_S16BE:
146
    case AV_CODEC_ID_PCM_U16LE:
147
    case AV_CODEC_ID_PCM_U16BE: format = FORMAT_I16; break;
148
    case AV_CODEC_ID_PCM_S32LE:
149
    case AV_CODEC_ID_PCM_S32BE:
150
    case AV_CODEC_ID_PCM_U32LE:
151
    case AV_CODEC_ID_PCM_U32BE: format = FORMAT_I32; break;
152
    case AV_CODEC_ID_PCM_F32LE:
153
    case AV_CODEC_ID_PCM_F32BE: format = FORMAT_F32; break;
154
    default:                 return AVERROR(ENOSYS);
155
    }
156
157
    if      (layout == AV_CH_LAYOUT_5POINT0_BACK || layout == AV_CH_LAYOUT_5POINT0)
158
        PICK_REORDER(50)
159
    else if (layout == AV_CH_LAYOUT_5POINT1_BACK || layout == AV_CH_LAYOUT_5POINT1)
160
        PICK_REORDER(51)
161
    else if (layout == AV_CH_LAYOUT_7POINT1)
162
        PICK_REORDER(71)
163
164
    return s->reorder_func ? 0 : AVERROR(ENOSYS);
165
}
166
167
av_cold int ff_alsa_open(AVFormatContext *ctx, snd_pcm_stream_t mode,
168
                         unsigned int *sample_rate,
169
                         int channels, enum AVCodecID *codec_id)
170
{
171
    AlsaData *s = ctx->priv_data;
172
    const char *audio_device;
173
    int res, flags = 0;
174
    snd_pcm_format_t format;
175
    snd_pcm_t *h;
176
    snd_pcm_hw_params_t *hw_params;
177
    snd_pcm_uframes_t buffer_size, period_size;
178
    uint64_t layout = ctx->streams[0]->codecpar->channel_layout;
179
180
    if (ctx->url[0] == 0) audio_device = "default";
181
    else                  audio_device = ctx->url;
182
183
    if (*codec_id == AV_CODEC_ID_NONE)
184
        *codec_id = DEFAULT_CODEC_ID;
185
    format = codec_id_to_pcm_format(*codec_id);
186
    if (format == SND_PCM_FORMAT_UNKNOWN) {
187
        av_log(ctx, AV_LOG_ERROR, "sample format 0x%04x is not supported\n", *codec_id);
188
        return AVERROR(ENOSYS);
189
    }
190
    s->frame_size = av_get_bits_per_sample(*codec_id) / 8 * channels;
191
192
    if (ctx->flags & AVFMT_FLAG_NONBLOCK) {
193
        flags = SND_PCM_NONBLOCK;
194
    }
195
    res = snd_pcm_open(&h, audio_device, mode, flags);
196
    if (res < 0) {
197
        av_log(ctx, AV_LOG_ERROR, "cannot open audio device %s (%s)\n",
198
               audio_device, snd_strerror(res));
199
        return AVERROR(EIO);
200
    }
201
202
    res = snd_pcm_hw_params_malloc(&hw_params);
203
    if (res < 0) {
204
        av_log(ctx, AV_LOG_ERROR, "cannot allocate hardware parameter structure (%s)\n",
205
               snd_strerror(res));
206
        goto fail1;
207
    }
208
209
    res = snd_pcm_hw_params_any(h, hw_params);
210
    if (res < 0) {
211
        av_log(ctx, AV_LOG_ERROR, "cannot initialize hardware parameter structure (%s)\n",
212
               snd_strerror(res));
213
        goto fail;
214
    }
215
216
    res = snd_pcm_hw_params_set_access(h, hw_params, SND_PCM_ACCESS_RW_INTERLEAVED);
217
    if (res < 0) {
218
        av_log(ctx, AV_LOG_ERROR, "cannot set access type (%s)\n",
219
               snd_strerror(res));
220
        goto fail;
221
    }
222
223
    res = snd_pcm_hw_params_set_format(h, hw_params, format);
224
    if (res < 0) {
225
        av_log(ctx, AV_LOG_ERROR, "cannot set sample format 0x%04x %d (%s)\n",
226
               *codec_id, format, snd_strerror(res));
227
        goto fail;
228
    }
229
230
    res = snd_pcm_hw_params_set_rate_near(h, hw_params, sample_rate, 0);
231
    if (res < 0) {
232
        av_log(ctx, AV_LOG_ERROR, "cannot set sample rate (%s)\n",
233
               snd_strerror(res));
234
        goto fail;
235
    }
236
237
    res = snd_pcm_hw_params_set_channels(h, hw_params, channels);
238
    if (res < 0) {
239
        av_log(ctx, AV_LOG_ERROR, "cannot set channel count to %d (%s)\n",
240
               channels, snd_strerror(res));
241
        goto fail;
242
    }
243
244
    snd_pcm_hw_params_get_buffer_size_max(hw_params, &buffer_size);
245
    buffer_size = FFMIN(buffer_size, ALSA_BUFFER_SIZE_MAX);
246
    /* TODO: maybe use ctx->max_picture_buffer somehow */
247
    res = snd_pcm_hw_params_set_buffer_size_near(h, hw_params, &buffer_size);
248
    if (res < 0) {
249
        av_log(ctx, AV_LOG_ERROR, "cannot set ALSA buffer size (%s)\n",
250
               snd_strerror(res));
251
        goto fail;
252
    }
253
254
    snd_pcm_hw_params_get_period_size_min(hw_params, &period_size, NULL);
255
    if (!period_size)
256
        period_size = buffer_size / 4;
257
    res = snd_pcm_hw_params_set_period_size_near(h, hw_params, &period_size, NULL);
258
    if (res < 0) {
259
        av_log(ctx, AV_LOG_ERROR, "cannot set ALSA period size (%s)\n",
260
               snd_strerror(res));
261
        goto fail;
262
    }
263
    s->period_size = period_size;
264
265
    res = snd_pcm_hw_params(h, hw_params);
266
    if (res < 0) {
267
        av_log(ctx, AV_LOG_ERROR, "cannot set parameters (%s)\n",
268
               snd_strerror(res));
269
        goto fail;
270
    }
271
272
    snd_pcm_hw_params_free(hw_params);
273
274
    if (channels > 2 && layout) {
275
        if (find_reorder_func(s, *codec_id, layout, mode == SND_PCM_STREAM_PLAYBACK) < 0) {
276
            char name[128];
277
            av_get_channel_layout_string(name, sizeof(name), channels, layout);
278
            av_log(ctx, AV_LOG_WARNING, "ALSA channel layout unknown or unimplemented for %s %s.\n",
279
                   name, mode == SND_PCM_STREAM_PLAYBACK ? "playback" : "capture");
280
        }
281
        if (s->reorder_func) {
282
            s->reorder_buf_size = buffer_size;
283
            s->reorder_buf = av_malloc_array(s->reorder_buf_size, s->frame_size);
284
            if (!s->reorder_buf)
285
                goto fail1;
286
        }
287
    }
288
289
    s->h = h;
290
    return 0;
291
292
fail:
293
    snd_pcm_hw_params_free(hw_params);
294
fail1:
295
    snd_pcm_close(h);
296
    return AVERROR(EIO);
297
}
298
299
av_cold int ff_alsa_close(AVFormatContext *s1)
300
{
301
    AlsaData *s = s1->priv_data;
302
303
    if (snd_pcm_stream(s->h) == SND_PCM_STREAM_PLAYBACK) {
304
        snd_pcm_nonblock(s->h, 0);
305
        snd_pcm_drain(s->h);
306
    }
307
    av_freep(&s->reorder_buf);
308
    if (CONFIG_ALSA_INDEV)
309
        ff_timefilter_destroy(s->timefilter);
310
    snd_pcm_close(s->h);
311
    return 0;
312
}
313
314
int ff_alsa_xrun_recover(AVFormatContext *s1, int err)
315
{
316
    AlsaData *s = s1->priv_data;
317
    snd_pcm_t *handle = s->h;
318
319
    av_log(s1, AV_LOG_WARNING, "ALSA buffer xrun.\n");
320
    if (err == -EPIPE) {
321
        err = snd_pcm_prepare(handle);
322
        if (err < 0) {
323
            av_log(s1, AV_LOG_ERROR, "cannot recover from underrun (snd_pcm_prepare failed: %s)\n", snd_strerror(err));
324
325
            return AVERROR(EIO);
326
        }
327
    } else if (err == -ESTRPIPE) {
328
        av_log(s1, AV_LOG_ERROR, "-ESTRPIPE... Unsupported!\n");
329
330
        return -1;
331
    }
332
    return err;
333
}
334
335
int ff_alsa_extend_reorder_buf(AlsaData *s, int min_size)
336
{
337
    int size = s->reorder_buf_size;
338
    void *r;
339
340
    av_assert0(size != 0);
341
    while (size < min_size)
342
        size *= 2;
343
    r = av_realloc_array(s->reorder_buf, size, s->frame_size);
344
    if (!r)
345
        return AVERROR(ENOMEM);
346
    s->reorder_buf = r;
347
    s->reorder_buf_size = size;
348
    return 0;
349
}
350
351
/* ported from alsa-utils/aplay.c */
352
int ff_alsa_get_device_list(AVDeviceInfoList *device_list, snd_pcm_stream_t stream_type)
353
{
354
    int ret = 0;
355
    void **hints, **n;
356
    char *name = NULL, *descr = NULL, *io = NULL, *tmp;
357
    AVDeviceInfo *new_device = NULL;
358
    const char *filter = stream_type == SND_PCM_STREAM_PLAYBACK ? "Output" : "Input";
359
360
    if (snd_device_name_hint(-1, "pcm", &hints) < 0)
361
        return AVERROR_EXTERNAL;
362
    n = hints;
363
    while (*n && !ret) {
364
        name = snd_device_name_get_hint(*n, "NAME");
365
        descr = snd_device_name_get_hint(*n, "DESC");
366
        io = snd_device_name_get_hint(*n, "IOID");
367
        if (!io || !strcmp(io, filter)) {
368
            new_device = av_mallocz(sizeof(AVDeviceInfo));
369
            if (!new_device) {
370
                ret = AVERROR(ENOMEM);
371
                goto fail;
372
            }
373
            new_device->device_name = av_strdup(name);
374
            if ((tmp = strrchr(descr, '\n')) && tmp[1])
375
                new_device->device_description = av_strdup(&tmp[1]);
376
            else
377
                new_device->device_description = av_strdup(descr);
378
            if (!new_device->device_description || !new_device->device_name) {
379
                ret = AVERROR(ENOMEM);
380
                goto fail;
381
            }
382
            if ((ret = av_dynarray_add_nofree(&device_list->devices,
383
                                              &device_list->nb_devices, new_device)) < 0) {
384
                goto fail;
385
            }
386
            if (!strcmp(new_device->device_name, "default"))
387
                device_list->default_device = device_list->nb_devices - 1;
388
            new_device = NULL;
389
        }
390
      fail:
391
        free(io);
392
        free(name);
393
        free(descr);
394
        n++;
395
    }
396
    if (new_device) {
397
        av_free(new_device->device_description);
398
        av_free(new_device->device_name);
399
        av_free(new_device);
400
    }
401
    snd_device_name_free_hint(hints);
402
    return ret;
403
}