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-audio.h" 37 38static 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) \ 66static 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 86MAKE_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 94MAKE_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 103MAKE_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)\ 120switch(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 127static 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 167av_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]->codec->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(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 292fail: 293 snd_pcm_hw_params_free(hw_params); 294fail1: 295 snd_pcm_close(h); 296 return AVERROR(EIO); 297} 298 299av_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 310int 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 331int 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(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