2 * ALSA input and output
3 * Copyright (c) 2007 Luca Abeni ( lucabe72 email it )
4 * Copyright (c) 2007 Benoit Fouet ( benoit fouet free fr )
6 * This file is part of FFmpeg.
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.
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.
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
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 )
31 #include <alsa/asoundlib.h>
33 #include "libavutil/avassert.h"
34 #include "libavutil/channel_layout.h"
36 #include "alsa-audio.h"
38 static av_cold snd_pcm_format_t
codec_id_to_pcm_format(int 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
;
65 #define MAKE_REORDER_FUNC(NAME, TYPE, CHANNELS, LAYOUT, MAP) \
66 static void alsa_reorder_ ## NAME ## _ ## LAYOUT(const void *in_v, \
70 const TYPE *in = in_v; \
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)
86 MAKE_REORDER_FUNCS(5, out_50
, \
94 MAKE_REORDER_FUNCS(6, out_51
, \
103 MAKE_REORDER_FUNCS(8, out_71
, \
119 #define PICK_REORDER(layout)\
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;\
127 static av_cold
int find_reorder_func(AlsaData
*s
, int codec_id
, uint64_t layout
, int out
)
131 /* reordering input is not currently supported */
133 return AVERROR(ENOSYS
);
135 /* reordering is not needed for QUAD or 2_2 layout */
136 if (layout
== AV_CH_LAYOUT_QUAD
|| layout
== AV_CH_LAYOUT_2_2
)
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
);
157 if (layout
== AV_CH_LAYOUT_5POINT0_BACK
|| layout
== AV_CH_LAYOUT_5POINT0
)
159 else if (layout
== AV_CH_LAYOUT_5POINT1_BACK
|| layout
== AV_CH_LAYOUT_5POINT1
)
161 else if (layout
== AV_CH_LAYOUT_7POINT1
)
164 return s
->reorder_func
? 0 : AVERROR(ENOSYS
);
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
)
171 AlsaData
*s
= ctx
->priv_data
;
172 const char *audio_device
;
174 snd_pcm_format_t format
;
176 snd_pcm_hw_params_t
*hw_params
;
177 snd_pcm_uframes_t buffer_size
, period_size
;
178 uint64_t layout
= ctx
->streams
[0]->codec
->channel_layout
;
180 if (ctx
->filename
[0] == 0) audio_device
= "default";
181 else audio_device
= ctx
->filename
;
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
);
190 s
->frame_size
= av_get_bits_per_sample(*codec_id
) / 8 * channels
;
192 if (ctx
->flags
& AVFMT_FLAG_NONBLOCK
) {
193 flags
= SND_PCM_NONBLOCK
;
195 res
= snd_pcm_open(&h
, audio_device
, mode
, flags
);
197 av_log(ctx
, AV_LOG_ERROR
, "cannot open audio device %s (%s)\n",
198 audio_device
, snd_strerror(res
));
202 res
= snd_pcm_hw_params_malloc(&hw_params
);
204 av_log(ctx
, AV_LOG_ERROR
, "cannot allocate hardware parameter structure (%s)\n",
209 res
= snd_pcm_hw_params_any(h
, hw_params
);
211 av_log(ctx
, AV_LOG_ERROR
, "cannot initialize hardware parameter structure (%s)\n",
216 res
= snd_pcm_hw_params_set_access(h
, hw_params
, SND_PCM_ACCESS_RW_INTERLEAVED
);
218 av_log(ctx
, AV_LOG_ERROR
, "cannot set access type (%s)\n",
223 res
= snd_pcm_hw_params_set_format(h
, hw_params
, format
);
225 av_log(ctx
, AV_LOG_ERROR
, "cannot set sample format 0x%04x %d (%s)\n",
226 *codec_id
, format
, snd_strerror(res
));
230 res
= snd_pcm_hw_params_set_rate_near(h
, hw_params
, sample_rate
, 0);
232 av_log(ctx
, AV_LOG_ERROR
, "cannot set sample rate (%s)\n",
237 res
= snd_pcm_hw_params_set_channels(h
, hw_params
, channels
);
239 av_log(ctx
, AV_LOG_ERROR
, "cannot set channel count to %d (%s)\n",
240 channels
, snd_strerror(res
));
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
);
249 av_log(ctx
, AV_LOG_ERROR
, "cannot set ALSA buffer size (%s)\n",
254 snd_pcm_hw_params_get_period_size_min(hw_params
, &period_size
, NULL
);
256 period_size
= buffer_size
/ 4;
257 res
= snd_pcm_hw_params_set_period_size_near(h
, hw_params
, &period_size
, NULL
);
259 av_log(ctx
, AV_LOG_ERROR
, "cannot set ALSA period size (%s)\n",
263 s
->period_size
= period_size
;
265 res
= snd_pcm_hw_params(h
, hw_params
);
267 av_log(ctx
, AV_LOG_ERROR
, "cannot set parameters (%s)\n",
272 snd_pcm_hw_params_free(hw_params
);
274 if (channels
> 2 && layout
) {
275 if (find_reorder_func(s
, *codec_id
, layout
, mode
== SND_PCM_STREAM_PLAYBACK
) < 0) {
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");
281 if (s
->reorder_func
) {
282 s
->reorder_buf_size
= buffer_size
;
283 s
->reorder_buf
= av_malloc(s
->reorder_buf_size
* s
->frame_size
);
293 snd_pcm_hw_params_free(hw_params
);
299 av_cold
int ff_alsa_close(AVFormatContext
*s1
)
301 AlsaData
*s
= s1
->priv_data
;
303 av_freep(&s
->reorder_buf
);
304 if (CONFIG_ALSA_INDEV
)
305 ff_timefilter_destroy(s
->timefilter
);
310 int ff_alsa_xrun_recover(AVFormatContext
*s1
, int err
)
312 AlsaData
*s
= s1
->priv_data
;
313 snd_pcm_t
*handle
= s
->h
;
315 av_log(s1
, AV_LOG_WARNING
, "ALSA buffer xrun.\n");
317 err
= snd_pcm_prepare(handle
);
319 av_log(s1
, AV_LOG_ERROR
, "cannot recover from underrun (snd_pcm_prepare failed: %s)\n", snd_strerror(err
));
323 } else if (err
== -ESTRPIPE
) {
324 av_log(s1
, AV_LOG_ERROR
, "-ESTRPIPE... Unsupported!\n");
331 int ff_alsa_extend_reorder_buf(AlsaData
*s
, int min_size
)
333 int size
= s
->reorder_buf_size
;
336 av_assert0(size
!= 0);
337 while (size
< min_size
)
339 r
= av_realloc(s
->reorder_buf
, size
* s
->frame_size
);
341 return AVERROR(ENOMEM
);
343 s
->reorder_buf_size
= size
;
347 /* ported from alsa-utils/aplay.c */
348 int ff_alsa_get_device_list(AVDeviceInfoList
*device_list
, snd_pcm_stream_t stream_type
)
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";
356 if (snd_device_name_hint(-1, "pcm", &hints
) < 0)
357 return AVERROR_EXTERNAL
;
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
));
366 ret
= AVERROR(ENOMEM
);
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]);
373 new_device
->device_description
= av_strdup(descr
);
374 if (!new_device
->device_description
|| !new_device
->device_name
) {
375 ret
= AVERROR(ENOMEM
);
378 if ((ret
= av_dynarray_add_nofree(&device_list
->devices
,
379 &device_list
->nb_devices
, new_device
)) < 0) {
391 av_free(new_device
->device_description
);
392 av_free(new_device
->device_name
);
395 snd_device_name_free_hint(hints
);