qemu/hw/usb/dev-audio.c
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   1/*
   2 * QEMU USB audio device
   3 *
   4 * written by:
   5 *  H. Peter Anvin <hpa@linux.intel.com>
   6 *  Gerd Hoffmann <kraxel@redhat.com>
   7 *
   8 * lousely based on usb net device code which is:
   9 *
  10 * Copyright (c) 2006 Thomas Sailer
  11 * Copyright (c) 2008 Andrzej Zaborowski
  12 *
  13 * Permission is hereby granted, free of charge, to any person obtaining a copy
  14 * of this software and associated documentation files (the "Software"), to deal
  15 * in the Software without restriction, including without limitation the rights
  16 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  17 * copies of the Software, and to permit persons to whom the Software is
  18 * furnished to do so, subject to the following conditions:
  19 *
  20 * The above copyright notice and this permission notice shall be included in
  21 * all copies or substantial portions of the Software.
  22 *
  23 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  24 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  25 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  26 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  27 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  28 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  29 * THE SOFTWARE.
  30 */
  31
  32#include "qemu-common.h"
  33#include "hw/usb.h"
  34#include "hw/usb/desc.h"
  35#include "hw/hw.h"
  36#include "audio/audio.h"
  37
  38#define USBAUDIO_VENDOR_NUM     0x46f4 /* CRC16() of "QEMU" */
  39#define USBAUDIO_PRODUCT_NUM    0x0002
  40
  41#define DEV_CONFIG_VALUE        1 /* The one and only */
  42
  43/* Descriptor subtypes for AC interfaces */
  44#define DST_AC_HEADER           1
  45#define DST_AC_INPUT_TERMINAL   2
  46#define DST_AC_OUTPUT_TERMINAL  3
  47#define DST_AC_FEATURE_UNIT     6
  48/* Descriptor subtypes for AS interfaces */
  49#define DST_AS_GENERAL          1
  50#define DST_AS_FORMAT_TYPE      2
  51/* Descriptor subtypes for endpoints */
  52#define DST_EP_GENERAL          1
  53
  54enum usb_audio_strings {
  55    STRING_NULL,
  56    STRING_MANUFACTURER,
  57    STRING_PRODUCT,
  58    STRING_SERIALNUMBER,
  59    STRING_CONFIG,
  60    STRING_USBAUDIO_CONTROL,
  61    STRING_INPUT_TERMINAL,
  62    STRING_FEATURE_UNIT,
  63    STRING_OUTPUT_TERMINAL,
  64    STRING_NULL_STREAM,
  65    STRING_REAL_STREAM,
  66};
  67
  68static const USBDescStrings usb_audio_stringtable = {
  69    [STRING_MANUFACTURER]       = "QEMU",
  70    [STRING_PRODUCT]            = "QEMU USB Audio",
  71    [STRING_SERIALNUMBER]       = "1",
  72    [STRING_CONFIG]             = "Audio Configuration",
  73    [STRING_USBAUDIO_CONTROL]   = "Audio Device",
  74    [STRING_INPUT_TERMINAL]     = "Audio Output Pipe",
  75    [STRING_FEATURE_UNIT]       = "Audio Output Volume Control",
  76    [STRING_OUTPUT_TERMINAL]    = "Audio Output Terminal",
  77    [STRING_NULL_STREAM]        = "Audio Output - Disabled",
  78    [STRING_REAL_STREAM]        = "Audio Output - 48 kHz Stereo",
  79};
  80
  81#define U16(x) ((x) & 0xff), (((x) >> 8) & 0xff)
  82#define U24(x) U16(x), (((x) >> 16) & 0xff)
  83#define U32(x) U24(x), (((x) >> 24) & 0xff)
  84
  85/*
  86 * A Basic Audio Device uses these specific values
  87 */
  88#define USBAUDIO_PACKET_SIZE     192
  89#define USBAUDIO_SAMPLE_RATE     48000
  90#define USBAUDIO_PACKET_INTERVAL 1
  91
  92static const USBDescIface desc_iface[] = {
  93    {
  94        .bInterfaceNumber              = 0,
  95        .bNumEndpoints                 = 0,
  96        .bInterfaceClass               = USB_CLASS_AUDIO,
  97        .bInterfaceSubClass            = USB_SUBCLASS_AUDIO_CONTROL,
  98        .bInterfaceProtocol            = 0x04,
  99        .iInterface                    = STRING_USBAUDIO_CONTROL,
 100        .ndesc                         = 4,
 101        .descs = (USBDescOther[]) {
 102            {
 103                /* Headphone Class-Specific AC Interface Header Descriptor */
 104                .data = (uint8_t[]) {
 105                    0x09,                       /*  u8  bLength */
 106                    USB_DT_CS_INTERFACE,        /*  u8  bDescriptorType */
 107                    DST_AC_HEADER,              /*  u8  bDescriptorSubtype */
 108                    U16(0x0100),                /* u16  bcdADC */
 109                    U16(0x2b),                  /* u16  wTotalLength */
 110                    0x01,                       /*  u8  bInCollection */
 111                    0x01,                       /*  u8  baInterfaceNr */
 112                }
 113            },{
 114                /* Generic Stereo Input Terminal ID1 Descriptor */
 115                .data = (uint8_t[]) {
 116                    0x0c,                       /*  u8  bLength */
 117                    USB_DT_CS_INTERFACE,        /*  u8  bDescriptorType */
 118                    DST_AC_INPUT_TERMINAL,      /*  u8  bDescriptorSubtype */
 119                    0x01,                       /*  u8  bTerminalID */
 120                    U16(0x0101),                /* u16  wTerminalType */
 121                    0x00,                       /*  u8  bAssocTerminal */
 122                    0x02,                       /* u16  bNrChannels */
 123                    U16(0x0003),                /* u16  wChannelConfig */
 124                    0x00,                       /*  u8  iChannelNames */
 125                    STRING_INPUT_TERMINAL,      /*  u8  iTerminal */
 126                }
 127            },{
 128                /* Generic Stereo Feature Unit ID2 Descriptor */
 129                .data = (uint8_t[]) {
 130                    0x0d,                       /*  u8  bLength */
 131                    USB_DT_CS_INTERFACE,        /*  u8  bDescriptorType */
 132                    DST_AC_FEATURE_UNIT,        /*  u8  bDescriptorSubtype */
 133                    0x02,                       /*  u8  bUnitID */
 134                    0x01,                       /*  u8  bSourceID */
 135                    0x02,                       /*  u8  bControlSize */
 136                    U16(0x0001),                /* u16  bmaControls(0) */
 137                    U16(0x0002),                /* u16  bmaControls(1) */
 138                    U16(0x0002),                /* u16  bmaControls(2) */
 139                    STRING_FEATURE_UNIT,        /*  u8  iFeature */
 140                }
 141            },{
 142                /* Headphone Ouptut Terminal ID3 Descriptor */
 143                .data = (uint8_t[]) {
 144                    0x09,                       /*  u8  bLength */
 145                    USB_DT_CS_INTERFACE,        /*  u8  bDescriptorType */
 146                    DST_AC_OUTPUT_TERMINAL,     /*  u8  bDescriptorSubtype */
 147                    0x03,                       /*  u8  bUnitID */
 148                    U16(0x0301),                /* u16  wTerminalType (SPK) */
 149                    0x00,                       /*  u8  bAssocTerminal */
 150                    0x02,                       /*  u8  bSourceID */
 151                    STRING_OUTPUT_TERMINAL,     /*  u8  iTerminal */
 152                }
 153            }
 154        },
 155    },{
 156        .bInterfaceNumber              = 1,
 157        .bAlternateSetting             = 0,
 158        .bNumEndpoints                 = 0,
 159        .bInterfaceClass               = USB_CLASS_AUDIO,
 160        .bInterfaceSubClass            = USB_SUBCLASS_AUDIO_STREAMING,
 161        .iInterface                    = STRING_NULL_STREAM,
 162    },{
 163        .bInterfaceNumber              = 1,
 164        .bAlternateSetting             = 1,
 165        .bNumEndpoints                 = 1,
 166        .bInterfaceClass               = USB_CLASS_AUDIO,
 167        .bInterfaceSubClass            = USB_SUBCLASS_AUDIO_STREAMING,
 168        .iInterface                    = STRING_REAL_STREAM,
 169        .ndesc                         = 2,
 170        .descs = (USBDescOther[]) {
 171            {
 172                /* Headphone Class-specific AS General Interface Descriptor */
 173                .data = (uint8_t[]) {
 174                    0x07,                       /*  u8  bLength */
 175                    USB_DT_CS_INTERFACE,        /*  u8  bDescriptorType */
 176                    DST_AS_GENERAL,             /*  u8  bDescriptorSubtype */
 177                    0x01,                       /*  u8  bTerminalLink */
 178                    0x00,                       /*  u8  bDelay */
 179                    0x01, 0x00,                 /* u16  wFormatTag */
 180                }
 181            },{
 182                /* Headphone Type I Format Type Descriptor */
 183                .data = (uint8_t[]) {
 184                    0x0b,                       /*  u8  bLength */
 185                    USB_DT_CS_INTERFACE,        /*  u8  bDescriptorType */
 186                    DST_AS_FORMAT_TYPE,         /*  u8  bDescriptorSubtype */
 187                    0x01,                       /*  u8  bFormatType */
 188                    0x02,                       /*  u8  bNrChannels */
 189                    0x02,                       /*  u8  bSubFrameSize */
 190                    0x10,                       /*  u8  bBitResolution */
 191                    0x01,                       /*  u8  bSamFreqType */
 192                    U24(USBAUDIO_SAMPLE_RATE),  /* u24  tSamFreq */
 193                }
 194            }
 195        },
 196        .eps = (USBDescEndpoint[]) {
 197            {
 198                .bEndpointAddress      = USB_DIR_OUT | 0x01,
 199                .bmAttributes          = 0x0d,
 200                .wMaxPacketSize        = USBAUDIO_PACKET_SIZE,
 201                .bInterval             = 1,
 202                .is_audio              = 1,
 203                /* Stereo Headphone Class-specific
 204                   AS Audio Data Endpoint Descriptor */
 205                .extra = (uint8_t[]) {
 206                    0x07,                       /*  u8  bLength */
 207                    USB_DT_CS_ENDPOINT,         /*  u8  bDescriptorType */
 208                    DST_EP_GENERAL,             /*  u8  bDescriptorSubtype */
 209                    0x00,                       /*  u8  bmAttributes */
 210                    0x00,                       /*  u8  bLockDelayUnits */
 211                    U16(0x0000),                /* u16  wLockDelay */
 212                },
 213            },
 214        }
 215    }
 216};
 217
 218static const USBDescDevice desc_device = {
 219    .bcdUSB                        = 0x0100,
 220    .bMaxPacketSize0               = 64,
 221    .bNumConfigurations            = 1,
 222    .confs = (USBDescConfig[]) {
 223        {
 224            .bNumInterfaces        = 2,
 225            .bConfigurationValue   = DEV_CONFIG_VALUE,
 226            .iConfiguration        = STRING_CONFIG,
 227            .bmAttributes          = USB_CFG_ATT_ONE | USB_CFG_ATT_SELFPOWER,
 228            .bMaxPower             = 0x32,
 229            .nif = ARRAY_SIZE(desc_iface),
 230            .ifs = desc_iface,
 231        },
 232    },
 233};
 234
 235static const USBDesc desc_audio = {
 236    .id = {
 237        .idVendor          = USBAUDIO_VENDOR_NUM,
 238        .idProduct         = USBAUDIO_PRODUCT_NUM,
 239        .bcdDevice         = 0,
 240        .iManufacturer     = STRING_MANUFACTURER,
 241        .iProduct          = STRING_PRODUCT,
 242        .iSerialNumber     = STRING_SERIALNUMBER,
 243    },
 244    .full = &desc_device,
 245    .str  = usb_audio_stringtable,
 246};
 247
 248/*
 249 * A USB audio device supports an arbitrary number of alternate
 250 * interface settings for each interface.  Each corresponds to a block
 251 * diagram of parameterized blocks.  This can thus refer to things like
 252 * number of channels, data rates, or in fact completely different
 253 * block diagrams.  Alternative setting 0 is always the null block diagram,
 254 * which is used by a disabled device.
 255 */
 256enum usb_audio_altset {
 257    ALTSET_OFF  = 0x00,         /* No endpoint */
 258    ALTSET_ON   = 0x01,         /* Single endpoint */
 259};
 260
 261/*
 262 * Class-specific control requests
 263 */
 264#define CR_SET_CUR      0x01
 265#define CR_GET_CUR      0x81
 266#define CR_SET_MIN      0x02
 267#define CR_GET_MIN      0x82
 268#define CR_SET_MAX      0x03
 269#define CR_GET_MAX      0x83
 270#define CR_SET_RES      0x04
 271#define CR_GET_RES      0x84
 272#define CR_SET_MEM      0x05
 273#define CR_GET_MEM      0x85
 274#define CR_GET_STAT     0xff
 275
 276/*
 277 * Feature Unit Control Selectors
 278 */
 279#define MUTE_CONTROL                    0x01
 280#define VOLUME_CONTROL                  0x02
 281#define BASS_CONTROL                    0x03
 282#define MID_CONTROL                     0x04
 283#define TREBLE_CONTROL                  0x05
 284#define GRAPHIC_EQUALIZER_CONTROL       0x06
 285#define AUTOMATIC_GAIN_CONTROL          0x07
 286#define DELAY_CONTROL                   0x08
 287#define BASS_BOOST_CONTROL              0x09
 288#define LOUDNESS_CONTROL                0x0a
 289
 290/*
 291 * buffering
 292 */
 293
 294struct streambuf {
 295    uint8_t *data;
 296    uint32_t size;
 297    uint32_t prod;
 298    uint32_t cons;
 299};
 300
 301static void streambuf_init(struct streambuf *buf, uint32_t size)
 302{
 303    g_free(buf->data);
 304    buf->size = size - (size % USBAUDIO_PACKET_SIZE);
 305    buf->data = g_malloc(buf->size);
 306    buf->prod = 0;
 307    buf->cons = 0;
 308}
 309
 310static void streambuf_fini(struct streambuf *buf)
 311{
 312    g_free(buf->data);
 313    buf->data = NULL;
 314}
 315
 316static int streambuf_put(struct streambuf *buf, USBPacket *p)
 317{
 318    uint32_t free = buf->size - (buf->prod - buf->cons);
 319
 320    if (!free) {
 321        return 0;
 322    }
 323    assert(free >= USBAUDIO_PACKET_SIZE);
 324    usb_packet_copy(p, buf->data + (buf->prod % buf->size),
 325                    USBAUDIO_PACKET_SIZE);
 326    buf->prod += USBAUDIO_PACKET_SIZE;
 327    return USBAUDIO_PACKET_SIZE;
 328}
 329
 330static uint8_t *streambuf_get(struct streambuf *buf)
 331{
 332    uint32_t used = buf->prod - buf->cons;
 333    uint8_t *data;
 334
 335    if (!used) {
 336        return NULL;
 337    }
 338    assert(used >= USBAUDIO_PACKET_SIZE);
 339    data = buf->data + (buf->cons % buf->size);
 340    buf->cons += USBAUDIO_PACKET_SIZE;
 341    return data;
 342}
 343
 344typedef struct USBAudioState {
 345    /* qemu interfaces */
 346    USBDevice dev;
 347    QEMUSoundCard card;
 348
 349    /* state */
 350    struct {
 351        enum usb_audio_altset altset;
 352        struct audsettings as;
 353        SWVoiceOut *voice;
 354        bool mute;
 355        uint8_t vol[2];
 356        struct streambuf buf;
 357    } out;
 358
 359    /* properties */
 360    uint32_t debug;
 361    uint32_t buffer;
 362} USBAudioState;
 363
 364static void output_callback(void *opaque, int avail)
 365{
 366    USBAudioState *s = opaque;
 367    uint8_t *data;
 368
 369    for (;;) {
 370        if (avail < USBAUDIO_PACKET_SIZE) {
 371            return;
 372        }
 373        data = streambuf_get(&s->out.buf);
 374        if (!data) {
 375            return;
 376        }
 377        AUD_write(s->out.voice, data, USBAUDIO_PACKET_SIZE);
 378        avail -= USBAUDIO_PACKET_SIZE;
 379    }
 380}
 381
 382static int usb_audio_set_output_altset(USBAudioState *s, int altset)
 383{
 384    switch (altset) {
 385    case ALTSET_OFF:
 386        streambuf_init(&s->out.buf, s->buffer);
 387        AUD_set_active_out(s->out.voice, false);
 388        break;
 389    case ALTSET_ON:
 390        AUD_set_active_out(s->out.voice, true);
 391        break;
 392    default:
 393        return -1;
 394    }
 395
 396    if (s->debug) {
 397        fprintf(stderr, "usb-audio: set interface %d\n", altset);
 398    }
 399    s->out.altset = altset;
 400    return 0;
 401}
 402
 403/*
 404 * Note: we arbitrarily map the volume control range onto -inf..+8 dB
 405 */
 406#define ATTRIB_ID(cs, attrib, idif)     \
 407    (((cs) << 24) | ((attrib) << 16) | (idif))
 408
 409static int usb_audio_get_control(USBAudioState *s, uint8_t attrib,
 410                                 uint16_t cscn, uint16_t idif,
 411                                 int length, uint8_t *data)
 412{
 413    uint8_t cs = cscn >> 8;
 414    uint8_t cn = cscn - 1;      /* -1 for the non-present master control */
 415    uint32_t aid = ATTRIB_ID(cs, attrib, idif);
 416    int ret = USB_RET_STALL;
 417
 418    switch (aid) {
 419    case ATTRIB_ID(MUTE_CONTROL, CR_GET_CUR, 0x0200):
 420        data[0] = s->out.mute;
 421        ret = 1;
 422        break;
 423    case ATTRIB_ID(VOLUME_CONTROL, CR_GET_CUR, 0x0200):
 424        if (cn < 2) {
 425            uint16_t vol = (s->out.vol[cn] * 0x8800 + 127) / 255 + 0x8000;
 426            data[0] = vol;
 427            data[1] = vol >> 8;
 428            ret = 2;
 429        }
 430        break;
 431    case ATTRIB_ID(VOLUME_CONTROL, CR_GET_MIN, 0x0200):
 432        if (cn < 2) {
 433            data[0] = 0x01;
 434            data[1] = 0x80;
 435            ret = 2;
 436        }
 437        break;
 438    case ATTRIB_ID(VOLUME_CONTROL, CR_GET_MAX, 0x0200):
 439        if (cn < 2) {
 440            data[0] = 0x00;
 441            data[1] = 0x08;
 442            ret = 2;
 443        }
 444        break;
 445    case ATTRIB_ID(VOLUME_CONTROL, CR_GET_RES, 0x0200):
 446        if (cn < 2) {
 447            data[0] = 0x88;
 448            data[1] = 0x00;
 449            ret = 2;
 450        }
 451        break;
 452    }
 453
 454    return ret;
 455}
 456static int usb_audio_set_control(USBAudioState *s, uint8_t attrib,
 457                                 uint16_t cscn, uint16_t idif,
 458                                 int length, uint8_t *data)
 459{
 460    uint8_t cs = cscn >> 8;
 461    uint8_t cn = cscn - 1;      /* -1 for the non-present master control */
 462    uint32_t aid = ATTRIB_ID(cs, attrib, idif);
 463    int ret = USB_RET_STALL;
 464    bool set_vol = false;
 465
 466    switch (aid) {
 467    case ATTRIB_ID(MUTE_CONTROL, CR_SET_CUR, 0x0200):
 468        s->out.mute = data[0] & 1;
 469        set_vol = true;
 470        ret = 0;
 471        break;
 472    case ATTRIB_ID(VOLUME_CONTROL, CR_SET_CUR, 0x0200):
 473        if (cn < 2) {
 474            uint16_t vol = data[0] + (data[1] << 8);
 475
 476            if (s->debug) {
 477                fprintf(stderr, "usb-audio: vol %04x\n", (uint16_t)vol);
 478            }
 479
 480            vol -= 0x8000;
 481            vol = (vol * 255 + 0x4400) / 0x8800;
 482            if (vol > 255) {
 483                vol = 255;
 484            }
 485
 486            s->out.vol[cn] = vol;
 487            set_vol = true;
 488            ret = 0;
 489        }
 490        break;
 491    }
 492
 493    if (set_vol) {
 494        if (s->debug) {
 495            fprintf(stderr, "usb-audio: mute %d, lvol %3d, rvol %3d\n",
 496                    s->out.mute, s->out.vol[0], s->out.vol[1]);
 497        }
 498        AUD_set_volume_out(s->out.voice, s->out.mute,
 499                           s->out.vol[0], s->out.vol[1]);
 500    }
 501
 502    return ret;
 503}
 504
 505static void usb_audio_handle_control(USBDevice *dev, USBPacket *p,
 506                                    int request, int value, int index,
 507                                    int length, uint8_t *data)
 508{
 509    USBAudioState *s = DO_UPCAST(USBAudioState, dev, dev);
 510    int ret = 0;
 511
 512    if (s->debug) {
 513        fprintf(stderr, "usb-audio: control transaction: "
 514                "request 0x%04x value 0x%04x index 0x%04x length 0x%04x\n",
 515                request, value, index, length);
 516    }
 517
 518    ret = usb_desc_handle_control(dev, p, request, value, index, length, data);
 519    if (ret >= 0) {
 520        return;
 521    }
 522
 523    switch (request) {
 524    case ClassInterfaceRequest | CR_GET_CUR:
 525    case ClassInterfaceRequest | CR_GET_MIN:
 526    case ClassInterfaceRequest | CR_GET_MAX:
 527    case ClassInterfaceRequest | CR_GET_RES:
 528        ret = usb_audio_get_control(s, request & 0xff, value, index,
 529                                    length, data);
 530        if (ret < 0) {
 531            if (s->debug) {
 532                fprintf(stderr, "usb-audio: fail: get control\n");
 533            }
 534            goto fail;
 535        }
 536        p->actual_length = ret;
 537        break;
 538
 539    case ClassInterfaceOutRequest | CR_SET_CUR:
 540    case ClassInterfaceOutRequest | CR_SET_MIN:
 541    case ClassInterfaceOutRequest | CR_SET_MAX:
 542    case ClassInterfaceOutRequest | CR_SET_RES:
 543        ret = usb_audio_set_control(s, request & 0xff, value, index,
 544                                    length, data);
 545        if (ret < 0) {
 546            if (s->debug) {
 547                fprintf(stderr, "usb-audio: fail: set control\n");
 548            }
 549            goto fail;
 550        }
 551        break;
 552
 553    default:
 554fail:
 555        if (s->debug) {
 556            fprintf(stderr, "usb-audio: failed control transaction: "
 557                    "request 0x%04x value 0x%04x index 0x%04x length 0x%04x\n",
 558                    request, value, index, length);
 559        }
 560        p->status = USB_RET_STALL;
 561        break;
 562    }
 563}
 564
 565static void usb_audio_set_interface(USBDevice *dev, int iface,
 566                                    int old, int value)
 567{
 568    USBAudioState *s = DO_UPCAST(USBAudioState, dev, dev);
 569
 570    if (iface == 1) {
 571        usb_audio_set_output_altset(s, value);
 572    }
 573}
 574
 575static void usb_audio_handle_reset(USBDevice *dev)
 576{
 577    USBAudioState *s = DO_UPCAST(USBAudioState, dev, dev);
 578
 579    if (s->debug) {
 580        fprintf(stderr, "usb-audio: reset\n");
 581    }
 582    usb_audio_set_output_altset(s, ALTSET_OFF);
 583}
 584
 585static void usb_audio_handle_dataout(USBAudioState *s, USBPacket *p)
 586{
 587    if (s->out.altset == ALTSET_OFF) {
 588        p->status = USB_RET_STALL;
 589        return;
 590    }
 591
 592    streambuf_put(&s->out.buf, p);
 593    if (p->actual_length < p->iov.size && s->debug > 1) {
 594        fprintf(stderr, "usb-audio: output overrun (%zd bytes)\n",
 595                p->iov.size - p->actual_length);
 596    }
 597}
 598
 599static void usb_audio_handle_data(USBDevice *dev, USBPacket *p)
 600{
 601    USBAudioState *s = (USBAudioState *) dev;
 602
 603    if (p->pid == USB_TOKEN_OUT && p->ep->nr == 1) {
 604        usb_audio_handle_dataout(s, p);
 605        return;
 606    }
 607
 608    p->status = USB_RET_STALL;
 609    if (s->debug) {
 610        fprintf(stderr, "usb-audio: failed data transaction: "
 611                        "pid 0x%x ep 0x%x len 0x%zx\n",
 612                        p->pid, p->ep->nr, p->iov.size);
 613    }
 614}
 615
 616static void usb_audio_handle_destroy(USBDevice *dev)
 617{
 618    USBAudioState *s = DO_UPCAST(USBAudioState, dev, dev);
 619
 620    if (s->debug) {
 621        fprintf(stderr, "usb-audio: destroy\n");
 622    }
 623
 624    usb_audio_set_output_altset(s, ALTSET_OFF);
 625    AUD_close_out(&s->card, s->out.voice);
 626    AUD_remove_card(&s->card);
 627
 628    streambuf_fini(&s->out.buf);
 629}
 630
 631static void usb_audio_realize(USBDevice *dev, Error **errp)
 632{
 633    USBAudioState *s = DO_UPCAST(USBAudioState, dev, dev);
 634
 635    usb_desc_create_serial(dev);
 636    usb_desc_init(dev);
 637    s->dev.opaque = s;
 638    AUD_register_card("usb-audio", &s->card);
 639
 640    s->out.altset        = ALTSET_OFF;
 641    s->out.mute          = false;
 642    s->out.vol[0]        = 240; /* 0 dB */
 643    s->out.vol[1]        = 240; /* 0 dB */
 644    s->out.as.freq       = USBAUDIO_SAMPLE_RATE;
 645    s->out.as.nchannels  = 2;
 646    s->out.as.fmt        = AUD_FMT_S16;
 647    s->out.as.endianness = 0;
 648    streambuf_init(&s->out.buf, s->buffer);
 649
 650    s->out.voice = AUD_open_out(&s->card, s->out.voice, "usb-audio",
 651                                s, output_callback, &s->out.as);
 652    AUD_set_volume_out(s->out.voice, s->out.mute, s->out.vol[0], s->out.vol[1]);
 653    AUD_set_active_out(s->out.voice, 0);
 654}
 655
 656static const VMStateDescription vmstate_usb_audio = {
 657    .name = "usb-audio",
 658    .unmigratable = 1,
 659};
 660
 661static Property usb_audio_properties[] = {
 662    DEFINE_PROP_UINT32("debug", USBAudioState, debug, 0),
 663    DEFINE_PROP_UINT32("buffer", USBAudioState, buffer,
 664                       8 * USBAUDIO_PACKET_SIZE),
 665    DEFINE_PROP_END_OF_LIST(),
 666};
 667
 668static void usb_audio_class_init(ObjectClass *klass, void *data)
 669{
 670    DeviceClass *dc = DEVICE_CLASS(klass);
 671    USBDeviceClass *k = USB_DEVICE_CLASS(klass);
 672
 673    dc->vmsd          = &vmstate_usb_audio;
 674    dc->props         = usb_audio_properties;
 675    set_bit(DEVICE_CATEGORY_SOUND, dc->categories);
 676    k->product_desc   = "QEMU USB Audio Interface";
 677    k->usb_desc       = &desc_audio;
 678    k->realize        = usb_audio_realize;
 679    k->handle_reset   = usb_audio_handle_reset;
 680    k->handle_control = usb_audio_handle_control;
 681    k->handle_data    = usb_audio_handle_data;
 682    k->handle_destroy = usb_audio_handle_destroy;
 683    k->set_interface  = usb_audio_set_interface;
 684}
 685
 686static const TypeInfo usb_audio_info = {
 687    .name          = "usb-audio",
 688    .parent        = TYPE_USB_DEVICE,
 689    .instance_size = sizeof(USBAudioState),
 690    .class_init    = usb_audio_class_init,
 691};
 692
 693static void usb_audio_register_types(void)
 694{
 695    type_register_static(&usb_audio_info);
 696    usb_legacy_register("usb-audio", "audio", NULL);
 697}
 698
 699type_init(usb_audio_register_types)
 700
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