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 Libav. 7 * 8 * Libav 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 * Libav 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 Libav; 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 "libavformat/avformat.h" 33#include "libavutil/avassert.h" 34#include "libavutil/audioconvert.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 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; 62 } 63} 64 65#define REORDER_OUT_50(NAME, TYPE) \ 66static void alsa_reorder_ ## NAME ## _out_50(const void *in_v, void *out_v, int n) \ 67{ \ 68 const TYPE *in = in_v; \ 69 TYPE *out = out_v; \ 70\ 71 while (n-- > 0) { \ 72 out[0] = in[0]; \ 73 out[1] = in[1]; \ 74 out[2] = in[3]; \ 75 out[3] = in[4]; \ 76 out[4] = in[2]; \ 77 in += 5; \ 78 out += 5; \ 79 } \ 80} 81 82#define REORDER_OUT_51(NAME, TYPE) \ 83static void alsa_reorder_ ## NAME ## _out_51(const void *in_v, void *out_v, int n) \ 84{ \ 85 const TYPE *in = in_v; \ 86 TYPE *out = out_v; \ 87\ 88 while (n-- > 0) { \ 89 out[0] = in[0]; \ 90 out[1] = in[1]; \ 91 out[2] = in[4]; \ 92 out[3] = in[5]; \ 93 out[4] = in[2]; \ 94 out[5] = in[3]; \ 95 in += 6; \ 96 out += 6; \ 97 } \ 98} 99 100#define REORDER_OUT_71(NAME, TYPE) \ 101static void alsa_reorder_ ## NAME ## _out_71(const void *in_v, void *out_v, int n) \ 102{ \ 103 const TYPE *in = in_v; \ 104 TYPE *out = out_v; \ 105\ 106 while (n-- > 0) { \ 107 out[0] = in[0]; \ 108 out[1] = in[1]; \ 109 out[2] = in[4]; \ 110 out[3] = in[5]; \ 111 out[4] = in[2]; \ 112 out[5] = in[3]; \ 113 out[6] = in[6]; \ 114 out[7] = in[7]; \ 115 in += 8; \ 116 out += 8; \ 117 } \ 118} 119 120REORDER_OUT_50(int8, int8_t) 121REORDER_OUT_51(int8, int8_t) 122REORDER_OUT_71(int8, int8_t) 123REORDER_OUT_50(int16, int16_t) 124REORDER_OUT_51(int16, int16_t) 125REORDER_OUT_71(int16, int16_t) 126REORDER_OUT_50(int32, int32_t) 127REORDER_OUT_51(int32, int32_t) 128REORDER_OUT_71(int32, int32_t) 129REORDER_OUT_50(f32, float) 130REORDER_OUT_51(f32, float) 131REORDER_OUT_71(f32, float) 132 133#define FORMAT_I8 0 134#define FORMAT_I16 1 135#define FORMAT_I32 2 136#define FORMAT_F32 3 137 138#define PICK_REORDER(layout)\ 139switch(format) {\ 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;\ 144} 145 146static av_cold int find_reorder_func(AlsaData *s, int codec_id, uint64_t layout, int out) 147{ 148 int format; 149 150 /* reordering input is not currently supported */ 151 if (!out) 152 return AVERROR(ENOSYS); 153 154 /* reordering is not needed for QUAD or 2_2 layout */ 155 if (layout == AV_CH_LAYOUT_QUAD || layout == AV_CH_LAYOUT_2_2) 156 return 0; 157 158 switch (codec_id) { 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); 174 } 175 176 if (layout == AV_CH_LAYOUT_5POINT0_BACK || layout == AV_CH_LAYOUT_5POINT0) 177 PICK_REORDER(50) 178 else if (layout == AV_CH_LAYOUT_5POINT1_BACK || layout == AV_CH_LAYOUT_5POINT1) 179 PICK_REORDER(51) 180 else if (layout == AV_CH_LAYOUT_7POINT1) 181 PICK_REORDER(71) 182 183 return s->reorder_func ? 0 : AVERROR(ENOSYS); 184} 185 186av_cold int ff_alsa_open(AVFormatContext *ctx, snd_pcm_stream_t mode, 187 unsigned int *sample_rate, 188 int channels, enum CodecID *codec_id) 189{ 190 AlsaData *s = ctx->priv_data; 191 const char *audio_device; 192 int res, flags = 0; 193 snd_pcm_format_t format; 194 snd_pcm_t *h; 195 snd_pcm_hw_params_t *hw_params; 196 snd_pcm_uframes_t buffer_size, period_size; 197 uint64_t layout = ctx->streams[0]->codec->channel_layout; 198 199 if (ctx->filename[0] == 0) audio_device = "default"; 200 else audio_device = ctx->filename; 201 202 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); 208 } 209 s->frame_size = av_get_bits_per_sample(*codec_id) / 8 * channels; 210 211 if (ctx->flags & AVFMT_FLAG_NONBLOCK) { 212 flags = SND_PCM_NONBLOCK; 213 } 214 res = snd_pcm_open(&h, audio_device, mode, flags); 215 if (res < 0) { 216 av_log(ctx, AV_LOG_ERROR, "cannot open audio device %s (%s)\n", 217 audio_device, snd_strerror(res)); 218 return AVERROR(EIO); 219 } 220 221 res = snd_pcm_hw_params_malloc(&hw_params); 222 if (res < 0) { 223 av_log(ctx, AV_LOG_ERROR, "cannot allocate hardware parameter structure (%s)\n", 224 snd_strerror(res)); 225 goto fail1; 226 } 227 228 res = snd_pcm_hw_params_any(h, hw_params); 229 if (res < 0) { 230 av_log(ctx, AV_LOG_ERROR, "cannot initialize hardware parameter structure (%s)\n", 231 snd_strerror(res)); 232 goto fail; 233 } 234 235 res = snd_pcm_hw_params_set_access(h, hw_params, SND_PCM_ACCESS_RW_INTERLEAVED); 236 if (res < 0) { 237 av_log(ctx, AV_LOG_ERROR, "cannot set access type (%s)\n", 238 snd_strerror(res)); 239 goto fail; 240 } 241 242 res = snd_pcm_hw_params_set_format(h, hw_params, format); 243 if (res < 0) { 244 av_log(ctx, AV_LOG_ERROR, "cannot set sample format 0x%04x %d (%s)\n", 245 *codec_id, format, snd_strerror(res)); 246 goto fail; 247 } 248 249 res = snd_pcm_hw_params_set_rate_near(h, hw_params, sample_rate, 0); 250 if (res < 0) { 251 av_log(ctx, AV_LOG_ERROR, "cannot set sample rate (%s)\n", 252 snd_strerror(res)); 253 goto fail; 254 } 255 256 res = snd_pcm_hw_params_set_channels(h, hw_params, channels); 257 if (res < 0) { 258 av_log(ctx, AV_LOG_ERROR, "cannot set channel count to %d (%s)\n", 259 channels, snd_strerror(res)); 260 goto fail; 261 } 262 263 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); 267 if (res < 0) { 268 av_log(ctx, AV_LOG_ERROR, "cannot set ALSA buffer size (%s)\n", 269 snd_strerror(res)); 270 goto fail; 271 } 272 273 snd_pcm_hw_params_get_period_size_min(hw_params, &period_size, NULL); 274 if (!period_size) 275 period_size = buffer_size / 4; 276 res = snd_pcm_hw_params_set_period_size_near(h, hw_params, &period_size, NULL); 277 if (res < 0) { 278 av_log(ctx, AV_LOG_ERROR, "cannot set ALSA period size (%s)\n", 279 snd_strerror(res)); 280 goto fail; 281 } 282 s->period_size = period_size; 283 284 res = snd_pcm_hw_params(h, hw_params); 285 if (res < 0) { 286 av_log(ctx, AV_LOG_ERROR, "cannot set parameters (%s)\n", 287 snd_strerror(res)); 288 goto fail; 289 } 290 291 snd_pcm_hw_params_free(hw_params); 292 293 if (channels > 2 && layout) { 294 if (find_reorder_func(s, *codec_id, layout, mode == SND_PCM_STREAM_PLAYBACK) < 0) { 295 char name[128]; 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"); 299 } 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); 303 if (!s->reorder_buf) 304 goto fail1; 305 } 306 } 307 308 s->h = h; 309 return 0; 310 311fail: 312 snd_pcm_hw_params_free(hw_params); 313fail1: 314 snd_pcm_close(h); 315 return AVERROR(EIO); 316} 317 318av_cold int ff_alsa_close(AVFormatContext *s1) 319{ 320 AlsaData *s = s1->priv_data; 321 322 av_freep(&s->reorder_buf); 323 snd_pcm_close(s->h); 324 return 0; 325} 326 327int ff_alsa_xrun_recover(AVFormatContext *s1, int err) 328{ 329 AlsaData *s = s1->priv_data; 330 snd_pcm_t *handle = s->h; 331 332 av_log(s1, AV_LOG_WARNING, "ALSA buffer xrun.\n"); 333 if (err == -EPIPE) { 334 err = snd_pcm_prepare(handle); 335 if (err < 0) { 336 av_log(s1, AV_LOG_ERROR, "cannot recover from underrun (snd_pcm_prepare failed: %s)\n", snd_strerror(err)); 337 338 return AVERROR(EIO); 339 } 340 } else if (err == -ESTRPIPE) { 341 av_log(s1, AV_LOG_ERROR, "-ESTRPIPE... Unsupported!\n"); 342 343 return -1; 344 } 345 return err; 346} 347 348int ff_alsa_extend_reorder_buf(AlsaData *s, int min_size) 349{ 350 int size = s->reorder_buf_size; 351 void *r; 352 353 av_assert0(size != 0); 354 while (size < min_size) 355 size *= 2; 356 r = av_realloc(s->reorder_buf, size * s->frame_size); 357 if (!r) 358 return AVERROR(ENOMEM); 359 s->reorder_buf = r; 360 s->reorder_buf_size = size; 361 return 0; 362} 363