libavdevice/alsa-audio-common.c

   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/channel_layout.h"
  35
  36 #include "alsa-audio.h"
  37
  38 static 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 REORDER_OUT_50(NAME, TYPE) \
  66 static 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) \
  83 static 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) \
 101 static 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
 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)
 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)\
 139 switch(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
 146 static 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 AV_CODEC_ID_PCM_S8:
 160     case AV_CODEC_ID_PCM_U8:
 161     case AV_CODEC_ID_PCM_ALAW:
 162     case AV_CODEC_ID_PCM_MULAW: format = FORMAT_I8;  break;
 163     case AV_CODEC_ID_PCM_S16LE:
 164     case AV_CODEC_ID_PCM_S16BE:
 165     case AV_CODEC_ID_PCM_U16LE:
 166     case AV_CODEC_ID_PCM_U16BE: format = FORMAT_I16; break;
 167     case AV_CODEC_ID_PCM_S32LE:
 168     case AV_CODEC_ID_PCM_S32BE:
 169     case AV_CODEC_ID_PCM_U32LE:
 170     case AV_CODEC_ID_PCM_U32BE: format = FORMAT_I32; break;
 171     case AV_CODEC_ID_PCM_F32LE:
 172     case AV_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
 186 av_cold int ff_alsa_open(AVFormatContext *ctx, snd_pcm_stream_t mode,
 187                          unsigned int *sample_rate,
 188                          int channels, enum AVCodecID *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 == AV_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
 311 fail:
 312     snd_pcm_hw_params_free(hw_params);
 313 fail1:
 314     snd_pcm_close(h);
 315     return AVERROR(EIO);
 316 }
 317
 318 av_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
 327 int 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
 348 int 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 }