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>
32 #include "libavformat/avformat.h"
34 #include "alsa-audio.h"
36 static av_cold snd_pcm_format_t codec_id_to_pcm_format(int codec_id)
39 case CODEC_ID_PCM_F64LE: return SND_PCM_FORMAT_FLOAT64_LE;
40 case CODEC_ID_PCM_F64BE: return SND_PCM_FORMAT_FLOAT64_BE;
41 case CODEC_ID_PCM_F32LE: return SND_PCM_FORMAT_FLOAT_LE;
42 case CODEC_ID_PCM_F32BE: return SND_PCM_FORMAT_FLOAT_BE;
43 case CODEC_ID_PCM_S32LE: return SND_PCM_FORMAT_S32_LE;
44 case CODEC_ID_PCM_S32BE: return SND_PCM_FORMAT_S32_BE;
45 case CODEC_ID_PCM_U32LE: return SND_PCM_FORMAT_U32_LE;
46 case CODEC_ID_PCM_U32BE: return SND_PCM_FORMAT_U32_BE;
47 case CODEC_ID_PCM_S24LE: return SND_PCM_FORMAT_S24_3LE;
48 case CODEC_ID_PCM_S24BE: return SND_PCM_FORMAT_S24_3BE;
49 case CODEC_ID_PCM_U24LE: return SND_PCM_FORMAT_U24_3LE;
50 case CODEC_ID_PCM_U24BE: return SND_PCM_FORMAT_U24_3BE;
51 case CODEC_ID_PCM_S16LE: return SND_PCM_FORMAT_S16_LE;
52 case CODEC_ID_PCM_S16BE: return SND_PCM_FORMAT_S16_BE;
53 case CODEC_ID_PCM_U16LE: return SND_PCM_FORMAT_U16_LE;
54 case CODEC_ID_PCM_U16BE: return SND_PCM_FORMAT_U16_BE;
55 case CODEC_ID_PCM_S8: return SND_PCM_FORMAT_S8;
56 case CODEC_ID_PCM_U8: return SND_PCM_FORMAT_U8;
57 case CODEC_ID_PCM_MULAW: return SND_PCM_FORMAT_MU_LAW;
58 case CODEC_ID_PCM_ALAW: return SND_PCM_FORMAT_A_LAW;
59 default: return SND_PCM_FORMAT_UNKNOWN;
63 #define REORDER_OUT_50(NAME, TYPE) \
64 static void alsa_reorder_ ## NAME ## _out_50(const void *in_v, void *out_v, int n) \
66 const TYPE *in = in_v; \
80 #define REORDER_OUT_51(NAME, TYPE) \
81 static void alsa_reorder_ ## NAME ## _out_51(const void *in_v, void *out_v, int n) \
83 const TYPE *in = in_v; \
98 #define REORDER_OUT_71(NAME, TYPE) \
99 static void alsa_reorder_ ## NAME ## _out_71(const void *in_v, void *out_v, int n) \
101 const TYPE *in = in_v; \
102 TYPE * out = out_v; \
118 REORDER_OUT_50(int16, int16_t)
119 REORDER_OUT_51(int16, int16_t)
120 REORDER_OUT_71(int16, int16_t)
121 REORDER_OUT_50(int32, int32_t)
122 REORDER_OUT_51(int32, int32_t)
123 REORDER_OUT_71(int32, int32_t)
124 REORDER_OUT_50(f32, float)
125 REORDER_OUT_51(f32, float)
126 REORDER_OUT_71(f32, float)
128 #define REORDER_DUMMY ((void *)1)
130 static av_cold ff_reorder_func find_reorder_func(int codec_id,
135 codec_id == CODEC_ID_PCM_U16LE || codec_id == CODEC_ID_PCM_U16BE ||
136 codec_id == CODEC_ID_PCM_S16LE || codec_id == CODEC_ID_PCM_S16BE ?
137 layout == AV_CH_LAYOUT_QUAD || layout == AV_CH_LAYOUT_2_2 ?
139 layout == AV_CH_LAYOUT_5POINT0_BACK || layout == AV_CH_LAYOUT_5POINT0 ?
140 out ? alsa_reorder_int16_out_50 : NULL :
141 layout == AV_CH_LAYOUT_5POINT1_BACK || layout == AV_CH_LAYOUT_5POINT1 ?
142 out ? alsa_reorder_int16_out_51 : NULL :
143 layout == AV_CH_LAYOUT_7POINT1 ?
144 out ? alsa_reorder_int16_out_71 : NULL :
146 codec_id == CODEC_ID_PCM_U32LE || codec_id == CODEC_ID_PCM_U32BE ||
147 codec_id == CODEC_ID_PCM_S32LE || codec_id == CODEC_ID_PCM_S32BE ?
148 layout == AV_CH_LAYOUT_QUAD || layout == AV_CH_LAYOUT_2_2 ?
150 layout == AV_CH_LAYOUT_5POINT0_BACK || layout == AV_CH_LAYOUT_5POINT0 ?
151 out ? alsa_reorder_int32_out_50 : NULL :
152 layout == AV_CH_LAYOUT_5POINT1_BACK || layout == AV_CH_LAYOUT_5POINT1 ?
153 out ? alsa_reorder_int32_out_51 : NULL :
154 layout == AV_CH_LAYOUT_7POINT1 ?
155 out ? alsa_reorder_int32_out_71 : NULL :
157 codec_id == CODEC_ID_PCM_F32LE || codec_id == CODEC_ID_PCM_F32BE ?
158 layout == AV_CH_LAYOUT_QUAD || layout == AV_CH_LAYOUT_2_2 ?
160 layout == AV_CH_LAYOUT_5POINT0_BACK || layout == AV_CH_LAYOUT_5POINT0 ?
161 out ? alsa_reorder_f32_out_50 : NULL :
162 layout == AV_CH_LAYOUT_5POINT1_BACK || layout == AV_CH_LAYOUT_5POINT1 ?
163 out ? alsa_reorder_f32_out_51 : NULL :
164 layout == AV_CH_LAYOUT_7POINT1 ?
165 out ? alsa_reorder_f32_out_71 : NULL :
170 av_cold int ff_alsa_open(AVFormatContext *ctx, snd_pcm_stream_t mode,
171 unsigned int *sample_rate,
172 int channels, enum CodecID *codec_id)
174 AlsaData *s = ctx->priv_data;
175 const char *audio_device;
177 snd_pcm_format_t format;
179 snd_pcm_hw_params_t *hw_params;
180 snd_pcm_uframes_t buffer_size, period_size;
181 int64_t layout = ctx->streams[0]->codec->channel_layout;
183 if (ctx->filename[0] == 0) audio_device = "default";
184 else audio_device = ctx->filename;
186 if (*codec_id == CODEC_ID_NONE)
187 *codec_id = DEFAULT_CODEC_ID;
188 format = codec_id_to_pcm_format(*codec_id);
189 if (format == SND_PCM_FORMAT_UNKNOWN) {
190 av_log(ctx, AV_LOG_ERROR, "sample format 0x%04x is not supported\n", *codec_id);
191 return AVERROR(ENOSYS);
193 s->frame_size = av_get_bits_per_sample(*codec_id) / 8 * channels;
195 if (ctx->flags & AVFMT_FLAG_NONBLOCK) {
196 flags = SND_PCM_NONBLOCK;
198 res = snd_pcm_open(&h, audio_device, mode, flags);
200 av_log(ctx, AV_LOG_ERROR, "cannot open audio device %s (%s)\n",
201 audio_device, snd_strerror(res));
205 res = snd_pcm_hw_params_malloc(&hw_params);
207 av_log(ctx, AV_LOG_ERROR, "cannot allocate hardware parameter structure (%s)\n",
212 res = snd_pcm_hw_params_any(h, hw_params);
214 av_log(ctx, AV_LOG_ERROR, "cannot initialize hardware parameter structure (%s)\n",
219 res = snd_pcm_hw_params_set_access(h, hw_params, SND_PCM_ACCESS_RW_INTERLEAVED);
221 av_log(ctx, AV_LOG_ERROR, "cannot set access type (%s)\n",
226 res = snd_pcm_hw_params_set_format(h, hw_params, format);
228 av_log(ctx, AV_LOG_ERROR, "cannot set sample format 0x%04x %d (%s)\n",
229 *codec_id, format, snd_strerror(res));
233 res = snd_pcm_hw_params_set_rate_near(h, hw_params, sample_rate, 0);
235 av_log(ctx, AV_LOG_ERROR, "cannot set sample rate (%s)\n",
240 res = snd_pcm_hw_params_set_channels(h, hw_params, channels);
242 av_log(ctx, AV_LOG_ERROR, "cannot set channel count to %d (%s)\n",
243 channels, snd_strerror(res));
247 snd_pcm_hw_params_get_buffer_size_max(hw_params, &buffer_size);
248 /* TODO: maybe use ctx->max_picture_buffer somehow */
249 res = snd_pcm_hw_params_set_buffer_size_near(h, hw_params, &buffer_size);
251 av_log(ctx, AV_LOG_ERROR, "cannot set ALSA buffer size (%s)\n",
256 snd_pcm_hw_params_get_period_size_min(hw_params, &period_size, NULL);
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 s->reorder_func = find_reorder_func(*codec_id, layout,
276 mode == SND_PCM_STREAM_PLAYBACK);
277 if (s->reorder_func == REORDER_DUMMY) {
278 s->reorder_func = NULL;
279 } else if (s->reorder_func) {
280 s->reorder_buf_size = buffer_size;
281 s->reorder_buf = av_malloc(s->reorder_buf_size * s->frame_size);
286 av_get_channel_layout_string(name, sizeof(name), channels, layout);
287 av_log(ctx, AV_LOG_WARNING,
288 "ALSA channel layout unknown or unimplemented for %s %s.\n",
290 mode == SND_PCM_STREAM_PLAYBACK ? "playback" : "capture");
298 snd_pcm_hw_params_free(hw_params);
304 av_cold int ff_alsa_close(AVFormatContext *s1)
306 AlsaData *s = s1->priv_data;
308 av_freep(&s->reorder_buf);
313 int ff_alsa_xrun_recover(AVFormatContext *s1, int err)
315 AlsaData *s = s1->priv_data;
316 snd_pcm_t *handle = s->h;
318 av_log(s1, AV_LOG_WARNING, "ALSA buffer xrun.\n");
320 err = snd_pcm_prepare(handle);
322 av_log(s1, AV_LOG_ERROR, "cannot recover from underrun (snd_pcm_prepare failed: %s)\n", snd_strerror(err));
326 } else if (err == -ESTRPIPE) {
327 av_log(s1, AV_LOG_ERROR, "-ESTRPIPE... Unsupported!\n");
334 int ff_alsa_extend_reorder_buf(AlsaData *s, int min_size)
336 int size = s->reorder_buf_size;
339 while (size < min_size)
341 r = av_realloc(s->reorder_buf, size * s->frame_size);
343 return AVERROR(ENOMEM);
345 s->reorder_buf_size = size;