blob: 8d27913a1a90ee99d61aa84d3f12c4dcdd8cace8
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->filename[0] == 0) audio_device = "default"; |
181 | else audio_device = ctx->filename; |
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 | av_freep(&s->reorder_buf); |
304 | if (CONFIG_ALSA_INDEV) |
305 | ff_timefilter_destroy(s->timefilter); |
306 | snd_pcm_close(s->h); |
307 | return 0; |
308 | } |
309 | |
310 | int ff_alsa_xrun_recover(AVFormatContext *s1, int err) |
311 | { |
312 | AlsaData *s = s1->priv_data; |
313 | snd_pcm_t *handle = s->h; |
314 | |
315 | av_log(s1, AV_LOG_WARNING, "ALSA buffer xrun.\n"); |
316 | if (err == -EPIPE) { |
317 | err = snd_pcm_prepare(handle); |
318 | if (err < 0) { |
319 | av_log(s1, AV_LOG_ERROR, "cannot recover from underrun (snd_pcm_prepare failed: %s)\n", snd_strerror(err)); |
320 | |
321 | return AVERROR(EIO); |
322 | } |
323 | } else if (err == -ESTRPIPE) { |
324 | av_log(s1, AV_LOG_ERROR, "-ESTRPIPE... Unsupported!\n"); |
325 | |
326 | return -1; |
327 | } |
328 | return err; |
329 | } |
330 | |
331 | int ff_alsa_extend_reorder_buf(AlsaData *s, int min_size) |
332 | { |
333 | int size = s->reorder_buf_size; |
334 | void *r; |
335 | |
336 | av_assert0(size != 0); |
337 | while (size < min_size) |
338 | size *= 2; |
339 | r = av_realloc_array(s->reorder_buf, size, s->frame_size); |
340 | if (!r) |
341 | return AVERROR(ENOMEM); |
342 | s->reorder_buf = r; |
343 | s->reorder_buf_size = size; |
344 | return 0; |
345 | } |
346 | |
347 | /* ported from alsa-utils/aplay.c */ |
348 | int ff_alsa_get_device_list(AVDeviceInfoList *device_list, snd_pcm_stream_t stream_type) |
349 | { |
350 | int ret = 0; |
351 | void **hints, **n; |
352 | char *name = NULL, *descr = NULL, *io = NULL, *tmp; |
353 | AVDeviceInfo *new_device = NULL; |
354 | const char *filter = stream_type == SND_PCM_STREAM_PLAYBACK ? "Output" : "Input"; |
355 | |
356 | if (snd_device_name_hint(-1, "pcm", &hints) < 0) |
357 | return AVERROR_EXTERNAL; |
358 | n = hints; |
359 | while (*n && !ret) { |
360 | name = snd_device_name_get_hint(*n, "NAME"); |
361 | descr = snd_device_name_get_hint(*n, "DESC"); |
362 | io = snd_device_name_get_hint(*n, "IOID"); |
363 | if (!io || !strcmp(io, filter)) { |
364 | new_device = av_mallocz(sizeof(AVDeviceInfo)); |
365 | if (!new_device) { |
366 | ret = AVERROR(ENOMEM); |
367 | goto fail; |
368 | } |
369 | new_device->device_name = av_strdup(name); |
370 | if ((tmp = strrchr(descr, '\n')) && tmp[1]) |
371 | new_device->device_description = av_strdup(&tmp[1]); |
372 | else |
373 | new_device->device_description = av_strdup(descr); |
374 | if (!new_device->device_description || !new_device->device_name) { |
375 | ret = AVERROR(ENOMEM); |
376 | goto fail; |
377 | } |
378 | if ((ret = av_dynarray_add_nofree(&device_list->devices, |
379 | &device_list->nb_devices, new_device)) < 0) { |
380 | goto fail; |
381 | } |
382 | if (!strcmp(new_device->device_name, "default")) |
383 | device_list->default_device = device_list->nb_devices - 1; |
384 | new_device = NULL; |
385 | } |
386 | fail: |
387 | free(io); |
388 | free(name); |
389 | free(descr); |
390 | n++; |
391 | } |
392 | if (new_device) { |
393 | av_free(new_device->device_description); |
394 | av_free(new_device->device_name); |
395 | av_free(new_device); |
396 | } |
397 | snd_device_name_free_hint(hints); |
398 | return ret; |
399 | } |
400 |