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/audioconvert.h"
36 #include "alsa-audio.h"
38 static av_cold snd_pcm_format_t codec_id_to_pcm_format(int codec_id)
41 case CODEC_ID_PCM_F64LE: return SND_PCM_FORMAT_FLOAT64_LE;
42 case CODEC_ID_PCM_F64BE: return SND_PCM_FORMAT_FLOAT64_BE;
43 case CODEC_ID_PCM_F32LE: return SND_PCM_FORMAT_FLOAT_LE;
44 case CODEC_ID_PCM_F32BE: return SND_PCM_FORMAT_FLOAT_BE;
45 case CODEC_ID_PCM_S32LE: return SND_PCM_FORMAT_S32_LE;
46 case CODEC_ID_PCM_S32BE: return SND_PCM_FORMAT_S32_BE;
47 case CODEC_ID_PCM_U32LE: return SND_PCM_FORMAT_U32_LE;
48 case CODEC_ID_PCM_U32BE: return SND_PCM_FORMAT_U32_BE;
49 case CODEC_ID_PCM_S24LE: return SND_PCM_FORMAT_S24_3LE;
50 case CODEC_ID_PCM_S24BE: return SND_PCM_FORMAT_S24_3BE;
51 case CODEC_ID_PCM_U24LE: return SND_PCM_FORMAT_U24_3LE;
52 case CODEC_ID_PCM_U24BE: return SND_PCM_FORMAT_U24_3BE;
53 case CODEC_ID_PCM_S16LE: return SND_PCM_FORMAT_S16_LE;
54 case CODEC_ID_PCM_S16BE: return SND_PCM_FORMAT_S16_BE;
55 case CODEC_ID_PCM_U16LE: return SND_PCM_FORMAT_U16_LE;
56 case CODEC_ID_PCM_U16BE: return SND_PCM_FORMAT_U16_BE;
57 case CODEC_ID_PCM_S8: return SND_PCM_FORMAT_S8;
58 case CODEC_ID_PCM_U8: return SND_PCM_FORMAT_U8;
59 case CODEC_ID_PCM_MULAW: return SND_PCM_FORMAT_MU_LAW;
60 case CODEC_ID_PCM_ALAW: return SND_PCM_FORMAT_A_LAW;
61 default: return SND_PCM_FORMAT_UNKNOWN;
65 #define REORDER_OUT_50(NAME, TYPE) \
66 static void alsa_reorder_ ## NAME ## _out_50(const void *in_v, void *out_v, int n) \
68 const TYPE *in = in_v; \
82 #define REORDER_OUT_51(NAME, TYPE) \
83 static void alsa_reorder_ ## NAME ## _out_51(const void *in_v, void *out_v, int n) \
85 const TYPE *in = in_v; \
100 #define REORDER_OUT_71(NAME, TYPE) \
101 static void alsa_reorder_ ## NAME ## _out_71(const void *in_v, void *out_v, int n) \
103 const TYPE *in = in_v; \
120 REORDER_OUT_50(int8, int8_t)
121 REORDER_OUT_51(int8, int8_t)
122 REORDER_OUT_71(int8, int8_t)
123 REORDER_OUT_50(int16, int16_t)
124 REORDER_OUT_51(int16, int16_t)
125 REORDER_OUT_71(int16, int16_t)
126 REORDER_OUT_50(int32, int32_t)
127 REORDER_OUT_51(int32, int32_t)
128 REORDER_OUT_71(int32, int32_t)
129 REORDER_OUT_50(f32, float)
130 REORDER_OUT_51(f32, float)
131 REORDER_OUT_71(f32, float)
138 #define PICK_REORDER(layout)\
140 case FORMAT_I8: s->reorder_func = alsa_reorder_int8_out_ ##layout; break;\
141 case FORMAT_I16: s->reorder_func = alsa_reorder_int16_out_ ##layout; break;\
142 case FORMAT_I32: s->reorder_func = alsa_reorder_int32_out_ ##layout; break;\
143 case FORMAT_F32: s->reorder_func = alsa_reorder_f32_out_ ##layout; break;\
146 static av_cold int find_reorder_func(AlsaData *s, int codec_id, int64_t layout, int out)
150 /* reordering input is not currently supported */
152 return AVERROR(ENOSYS);
154 /* reordering is not needed for QUAD or 2_2 layout */
155 if (layout == AV_CH_LAYOUT_QUAD || layout == AV_CH_LAYOUT_2_2)
159 case CODEC_ID_PCM_S8:
160 case CODEC_ID_PCM_U8:
161 case CODEC_ID_PCM_ALAW:
162 case CODEC_ID_PCM_MULAW: format = FORMAT_I8; break;
163 case CODEC_ID_PCM_S16LE:
164 case CODEC_ID_PCM_S16BE:
165 case CODEC_ID_PCM_U16LE:
166 case CODEC_ID_PCM_U16BE: format = FORMAT_I16; break;
167 case CODEC_ID_PCM_S32LE:
168 case CODEC_ID_PCM_S32BE:
169 case CODEC_ID_PCM_U32LE:
170 case CODEC_ID_PCM_U32BE: format = FORMAT_I32; break;
171 case CODEC_ID_PCM_F32LE:
172 case CODEC_ID_PCM_F32BE: format = FORMAT_F32; break;
173 default: return AVERROR(ENOSYS);
176 if (layout == AV_CH_LAYOUT_5POINT0_BACK || layout == AV_CH_LAYOUT_5POINT0)
178 else if (layout == AV_CH_LAYOUT_5POINT1_BACK || layout == AV_CH_LAYOUT_5POINT1)
180 else if (layout == AV_CH_LAYOUT_7POINT1)
183 return s->reorder_func ? 0 : AVERROR(ENOSYS);
186 av_cold int ff_alsa_open(AVFormatContext *ctx, snd_pcm_stream_t mode,
187 unsigned int *sample_rate,
188 int channels, enum CodecID *codec_id)
190 AlsaData *s = ctx->priv_data;
191 const char *audio_device;
193 snd_pcm_format_t format;
195 snd_pcm_hw_params_t *hw_params;
196 snd_pcm_uframes_t buffer_size, period_size;
197 int64_t layout = ctx->streams[0]->codec->channel_layout;
199 if (ctx->filename[0] == 0) audio_device = "default";
200 else audio_device = ctx->filename;
202 if (*codec_id == CODEC_ID_NONE)
203 *codec_id = DEFAULT_CODEC_ID;
204 format = codec_id_to_pcm_format(*codec_id);
205 if (format == SND_PCM_FORMAT_UNKNOWN) {
206 av_log(ctx, AV_LOG_ERROR, "sample format 0x%04x is not supported\n", *codec_id);
207 return AVERROR(ENOSYS);
209 s->frame_size = av_get_bits_per_sample(*codec_id) / 8 * channels;
211 if (ctx->flags & AVFMT_FLAG_NONBLOCK) {
212 flags = SND_PCM_NONBLOCK;
214 res = snd_pcm_open(&h, audio_device, mode, flags);
216 av_log(ctx, AV_LOG_ERROR, "cannot open audio device %s (%s)\n",
217 audio_device, snd_strerror(res));
221 res = snd_pcm_hw_params_malloc(&hw_params);
223 av_log(ctx, AV_LOG_ERROR, "cannot allocate hardware parameter structure (%s)\n",
228 res = snd_pcm_hw_params_any(h, hw_params);
230 av_log(ctx, AV_LOG_ERROR, "cannot initialize hardware parameter structure (%s)\n",
235 res = snd_pcm_hw_params_set_access(h, hw_params, SND_PCM_ACCESS_RW_INTERLEAVED);
237 av_log(ctx, AV_LOG_ERROR, "cannot set access type (%s)\n",
242 res = snd_pcm_hw_params_set_format(h, hw_params, format);
244 av_log(ctx, AV_LOG_ERROR, "cannot set sample format 0x%04x %d (%s)\n",
245 *codec_id, format, snd_strerror(res));
249 res = snd_pcm_hw_params_set_rate_near(h, hw_params, sample_rate, 0);
251 av_log(ctx, AV_LOG_ERROR, "cannot set sample rate (%s)\n",
256 res = snd_pcm_hw_params_set_channels(h, hw_params, channels);
258 av_log(ctx, AV_LOG_ERROR, "cannot set channel count to %d (%s)\n",
259 channels, snd_strerror(res));
263 snd_pcm_hw_params_get_buffer_size_max(hw_params, &buffer_size);
264 buffer_size = FFMIN(buffer_size, ALSA_BUFFER_SIZE_MAX);
265 /* TODO: maybe use ctx->max_picture_buffer somehow */
266 res = snd_pcm_hw_params_set_buffer_size_near(h, hw_params, &buffer_size);
268 av_log(ctx, AV_LOG_ERROR, "cannot set ALSA buffer size (%s)\n",
273 snd_pcm_hw_params_get_period_size_min(hw_params, &period_size, NULL);
275 period_size = buffer_size / 4;
276 res = snd_pcm_hw_params_set_period_size_near(h, hw_params, &period_size, NULL);
278 av_log(ctx, AV_LOG_ERROR, "cannot set ALSA period size (%s)\n",
282 s->period_size = period_size;
284 res = snd_pcm_hw_params(h, hw_params);
286 av_log(ctx, AV_LOG_ERROR, "cannot set parameters (%s)\n",
291 snd_pcm_hw_params_free(hw_params);
293 if (channels > 2 && layout) {
294 if (find_reorder_func(s, *codec_id, layout, mode == SND_PCM_STREAM_PLAYBACK) < 0) {
296 av_get_channel_layout_string(name, sizeof(name), channels, layout);
297 av_log(ctx, AV_LOG_WARNING, "ALSA channel layout unknown or unimplemented for %s %s.\n",
298 name, mode == SND_PCM_STREAM_PLAYBACK ? "playback" : "capture");
300 if (s->reorder_func) {
301 s->reorder_buf_size = buffer_size;
302 s->reorder_buf = av_malloc(s->reorder_buf_size * s->frame_size);
312 snd_pcm_hw_params_free(hw_params);
318 av_cold int ff_alsa_close(AVFormatContext *s1)
320 AlsaData *s = s1->priv_data;
322 av_freep(&s->reorder_buf);
323 if (CONFIG_ALSA_INDEV)
324 ff_timefilter_destroy(s->timefilter);
329 int ff_alsa_xrun_recover(AVFormatContext *s1, int err)
331 AlsaData *s = s1->priv_data;
332 snd_pcm_t *handle = s->h;
334 av_log(s1, AV_LOG_WARNING, "ALSA buffer xrun.\n");
336 err = snd_pcm_prepare(handle);
338 av_log(s1, AV_LOG_ERROR, "cannot recover from underrun (snd_pcm_prepare failed: %s)\n", snd_strerror(err));
342 } else if (err == -ESTRPIPE) {
343 av_log(s1, AV_LOG_ERROR, "-ESTRPIPE... Unsupported!\n");
350 int ff_alsa_extend_reorder_buf(AlsaData *s, int min_size)
352 int size = s->reorder_buf_size;
355 av_assert0(size != 0);
356 while (size < min_size)
358 r = av_realloc(s->reorder_buf, size * s->frame_size);
360 return AVERROR(ENOMEM);
362 s->reorder_buf_size = size;