import goldfish_audio from android

Signed-off-by: Greg Hackmann <ghackmann@google.com>

1 files changed, 627 insertions, 0 deletions

diff --git a/hw/audio/goldfish_audio.c b/hw/audio/goldfish_audio.c
new file mode 100644
index 0000000000..60e652caeb
--- /dev/null
+++ b/hw/audio/goldfish_audio.c
@@ -0,0 +1,627 @@
+/* Copyright (C) 2007-2008 The Android Open Source Project
+**
+** This software is licensed under the terms of the GNU General Public
+** License version 2, as published by the Free Software Foundation, and
+** may be copied, distributed, and modified under those terms.
+**
+** This program is distributed in the hope that it will be useful,
+** but WITHOUT ANY WARRANTY; without even the implied warranty of
+** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+** GNU General Public License for more details.
+*/
+#include "qemu_file.h"
+#include "goldfish_device.h"
+#include "audio/audio.h"
+#include "qemu_debug.h"
+#include "android/globals.h"
+
+#define  DEBUG  1
+
+#if DEBUG
+#  define  D(...)  VERBOSE_PRINT(audio,__VA_ARGS__)
+#else
+#  define  D(...)  ((void)0)
+#endif
+
+extern void  dprint(const char*  fmt, ...);
+
+/* define USE_QEMU_AUDIO_IN to 1 to use QEMU's audio subsystem to
+ * implement the audio input. if 0, this will try to read a .wav file
+ * directly...
+ */
+#define  USE_QEMU_AUDIO_IN  1
+
+enum {
+	/* audio status register */
+	AUDIO_INT_STATUS	= 0x00,
+	/* set this to enable IRQ */
+	AUDIO_INT_ENABLE	= 0x04,
+	/* set these to specify buffer addresses */
+	AUDIO_SET_WRITE_BUFFER_1 = 0x08,
+	AUDIO_SET_WRITE_BUFFER_2 = 0x0C,
+	/* set number of bytes in buffer to write */
+	AUDIO_WRITE_BUFFER_1  = 0x10,
+	AUDIO_WRITE_BUFFER_2  = 0x14,
+
+	/* true if audio input is supported */
+	AUDIO_READ_SUPPORTED = 0x18,
+	/* buffer to use for audio input */
+	AUDIO_SET_READ_BUFFER = 0x1C,
+
+	/* driver writes number of bytes to read */
+	AUDIO_START_READ  = 0x20,
+
+	/* number of bytes available in read buffer */
+	AUDIO_READ_BUFFER_AVAILABLE  = 0x24,
+
+	/* AUDIO_INT_STATUS bits */
+
+	/* this bit set when it is safe to write more bytes to the buffer */
+	AUDIO_INT_WRITE_BUFFER_1_EMPTY	= 1U << 0,
+	AUDIO_INT_WRITE_BUFFER_2_EMPTY	= 1U << 1,
+	AUDIO_INT_READ_BUFFER_FULL      = 1U << 2,
+};
+
+struct goldfish_audio_buff {
+    uint32_t  address;
+    uint32_t  length;
+    uint8*    data;
+    uint32_t  capacity;
+    uint32_t  offset;
+};
+
+
+struct goldfish_audio_state {
+    struct goldfish_device dev;
+    // buffer flags
+    uint32_t int_status;
+    // irq enable mask for int_status
+    uint32_t int_enable;
+
+#ifndef USE_QEMU_AUDIO_IN
+    // address of the read buffer
+    uint32_t read_buffer;
+    // path to file or device to use for input
+    const char* input_source;
+    // true if input is a wav file
+    int input_is_wav;
+    // true if we need to convert stereo -> mono
+    int input_is_stereo;
+    // file descriptor to use for input
+    int input_fd;
+#endif
+
+    // number of bytes available in the read buffer
+    int read_buffer_available;
+
+    // set to 1 or 2 to indicate which buffer we are writing from, or zero if both buffers are empty
+    int current_buffer;
+
+    // current data to write
+    struct goldfish_audio_buff  out_buff1[1];
+    struct goldfish_audio_buff  out_buff2[1];
+    struct goldfish_audio_buff  in_buff[1];
+
+    // for QEMU sound output
+    QEMUSoundCard card;
+    SWVoiceOut *voice;
+#if USE_QEMU_AUDIO_IN
+    SWVoiceIn*  voicein;
+#endif
+};
+
+static void
+goldfish_audio_buff_init( struct goldfish_audio_buff*  b )
+{
+    b->address  = 0;
+    b->length   = 0;
+    b->data     = NULL;
+    b->capacity = 0;
+    b->offset   = 0;
+}
+
+static void
+goldfish_audio_buff_reset( struct goldfish_audio_buff*  b )
+{
+    b->offset = 0;
+    b->length = 0;
+}
+
+static uint32_t
+goldfish_audio_buff_length( struct goldfish_audio_buff*  b )
+{
+    return b->length;
+}
+
+static void
+goldfish_audio_buff_ensure( struct goldfish_audio_buff*  b, uint32_t  size )
+{
+    if (b->capacity < size) {
+        b->data     = qemu_realloc(b->data, size);
+        b->capacity = size;
+    }
+}
+
+static void
+goldfish_audio_buff_set_address( struct goldfish_audio_buff*  b, uint32_t  addr )
+{
+    b->address = addr;
+}
+
+static void
+goldfish_audio_buff_set_length( struct goldfish_audio_buff*  b, uint32_t  len )
+{
+    b->length = len;
+    b->offset = 0;
+    goldfish_audio_buff_ensure(b, len);
+}
+
+static void
+goldfish_audio_buff_read( struct goldfish_audio_buff*  b )
+{
+    cpu_physical_memory_read(b->address, b->data, b->length);
+}
+
+static void
+goldfish_audio_buff_write( struct goldfish_audio_buff*  b )
+{
+    cpu_physical_memory_write(b->address, b->data, b->length);
+}
+
+static int
+goldfish_audio_buff_send( struct goldfish_audio_buff*  b, int  free, struct goldfish_audio_state*  s )
+{
+    int  ret, write = b->length;
+
+    if (write > free)
+        write = free;
+
+    ret = AUD_write(s->voice, b->data + b->offset, write);
+    b->offset += ret;
+    b->length -= ret;
+    return ret;
+}
+
+static int
+goldfish_audio_buff_available( struct goldfish_audio_buff*  b )
+{
+    return b->length - b->offset;
+}
+
+static int
+goldfish_audio_buff_recv( struct goldfish_audio_buff*  b, int  avail, struct goldfish_audio_state*  s )
+{
+    int     missing = b->length - b->offset;
+    int     avail2 = (avail > missing) ? missing : avail;
+    int     read;
+
+    read = AUD_read(s->voicein, b->data + b->offset, avail2 );
+    if (read == 0)
+        return 0;
+
+    if (avail2 > 0)
+        D("%s: AUD_read(%d) returned %d", __FUNCTION__, avail2, read);
+
+    cpu_physical_memory_write( b->address + b->offset, b->data, read );
+    b->offset += read;
+
+    return read;
+}
+
+static void
+goldfish_audio_buff_put( struct goldfish_audio_buff*  b, QEMUFile*  f )
+{
+    qemu_put_be32(f, b->address );
+    qemu_put_be32(f, b->length );
+    qemu_put_be32(f, b->offset );
+    qemu_put_buffer(f, b->data, b->length );
+}
+
+static void
+goldfish_audio_buff_get( struct goldfish_audio_buff*  b, QEMUFile*  f )
+{
+    b->address = qemu_get_be32(f);
+    b->length  = qemu_get_be32(f);
+    b->offset  = qemu_get_be32(f);
+    goldfish_audio_buff_ensure(b, b->length);
+    qemu_get_buffer(f, b->data, b->length);
+}
+
+/* update this whenever you change the goldfish_audio_state structure */
+#define  AUDIO_STATE_SAVE_VERSION  2
+
+#define  QFIELD_STRUCT   struct goldfish_audio_state
+QFIELD_BEGIN(audio_state_fields)
+    QFIELD_INT32(int_status),
+    QFIELD_INT32(int_enable),
+    QFIELD_INT32(read_buffer_available),
+    QFIELD_INT32(current_buffer),
+QFIELD_END
+
+static void  audio_state_save( QEMUFile*  f, void* opaque )
+{
+    struct goldfish_audio_state*  s = opaque;
+
+    qemu_put_struct(f, audio_state_fields, s);
+
+    goldfish_audio_buff_put (s->out_buff1, f);
+    goldfish_audio_buff_put (s->out_buff2, f);
+    goldfish_audio_buff_put (s->in_buff, f);
+}
+
+static int   audio_state_load( QEMUFile*  f, void*  opaque, int  version_id )
+{
+    struct goldfish_audio_state*  s = opaque;
+    int                           ret;
+
+    if (version_id != AUDIO_STATE_SAVE_VERSION)
+        return -1;
+
+    ret = qemu_get_struct(f, audio_state_fields, s);
+    if (!ret) {
+        goldfish_audio_buff_get( s->out_buff1, f );
+        goldfish_audio_buff_get( s->out_buff2, f );
+        goldfish_audio_buff_get (s->in_buff, f);
+    }
+    return ret;
+}
+
+static void enable_audio(struct goldfish_audio_state *s, int enable)
+{
+    // enable or disable the output voice
+    if (s->voice != NULL) {
+        AUD_set_active_out(s->voice,   (enable & (AUDIO_INT_WRITE_BUFFER_1_EMPTY | AUDIO_INT_WRITE_BUFFER_2_EMPTY)) != 0);
+        goldfish_audio_buff_reset( s->out_buff1 );
+        goldfish_audio_buff_reset( s->out_buff2 );
+    }
+
+    if (s->voicein) {
+        AUD_set_active_in (s->voicein, (enable & AUDIO_INT_READ_BUFFER_FULL) != 0);
+        goldfish_audio_buff_reset( s->in_buff );
+    }
+    s->current_buffer = 0;
+}
+
+#if USE_QEMU_AUDIO_IN
+static void start_read(struct goldfish_audio_state *s, uint32_t count)
+{
+    //printf( "... goldfish audio start_read, count=%d\n", count );
+    goldfish_audio_buff_set_length( s->in_buff, count );
+    s->read_buffer_available = count;
+}
+#else
+static void start_read(struct goldfish_audio_state *s, uint32_t count)
+{
+    uint8   wav_header[44];
+    int result;
+
+    if (!s->input_source) return;
+
+    if (s->input_fd < 0) {
+        s->input_fd = open(s->input_source, O_BINARY | O_RDONLY);
+
+        if (s->input_fd < 0) {
+            fprintf(stderr, "goldfish_audio could not open %s for audio input\n", s->input_source);
+            s->input_source = NULL; // set to to avoid endless retries
+            return;
+        }
+
+        // skip WAV header if we have a WAV file
+        if (s->input_is_wav) {
+            if (read(s->input_fd, wav_header, sizeof(wav_header)) != sizeof(wav_header)) {
+                fprintf(stderr, "goldfish_audio could not read WAV file header %s\n", s->input_source);
+                s->input_fd = -1;
+                s->input_source = NULL; // set to to avoid endless retries
+                return;
+            }
+
+            // is the WAV file stereo?
+            s->input_is_stereo = (wav_header[22] == 2);
+        } else {
+            // assume input from an audio device is stereo
+            s->input_is_stereo = 1;
+        }
+    }
+
+    uint8* buffer = (uint8*)phys_ram_base + s->read_buffer;
+    if (s->input_is_stereo) {
+        // need to read twice as much data
+        count *= 2;
+    }
+
+try_again:
+    result = read(s->input_fd, buffer, count);
+    if (result == 0 && s->input_is_wav) {
+        // end of file, so seek back to the beginning
+       lseek(s->input_fd, sizeof(wav_header), SEEK_SET);
+       goto try_again;
+    }
+
+    if (result > 0 && s->input_is_stereo) {
+        // we need to convert stereo to mono
+        uint8* src  = (uint8*)buffer;
+        uint8* dest = src;
+        int count = result/2;
+        while (count-- > 0) {
+            int  sample1 = src[0] | (src[1] << 8);
+            int  sample2 = src[2] | (src[3] << 8);
+            int  sample  = (sample1 + sample2) >> 1;
+            dst[0] = (uint8_t) sample;
+            dst[1] = (uint8_t)(sample >> 8);
+            src   += 4;
+            dst   += 2;
+        }
+
+        // we reduced the number of bytes by 2
+        result /= 2;
+    }
+
+    s->read_buffer_available = (result > 0 ? result : 0);
+    s->int_status |= AUDIO_INT_READ_BUFFER_FULL;
+    goldfish_device_set_irq(&s->dev, 0, (s->int_status & s->int_enable));
+}
+#endif
+
+static uint32_t goldfish_audio_read(void *opaque, target_phys_addr_t offset)
+{
+    uint32_t ret;
+    struct goldfish_audio_state *s = opaque;
+    switch(offset) {
+        case AUDIO_INT_STATUS:
+            // return current buffer status flags
+            ret = s->int_status & s->int_enable;
+            if(ret) {
+                goldfish_device_set_irq(&s->dev, 0, 0);
+            }
+            return ret;
+
+	case AUDIO_READ_SUPPORTED:
+#if USE_QEMU_AUDIO_IN
+            D("%s: AUDIO_READ_SUPPORTED returns %d", __FUNCTION__,
+              (s->voicein != NULL));
+            return (s->voicein != NULL);
+#else
+            return (s->input_source ? 1 : 0);
+#endif
+
+	case AUDIO_READ_BUFFER_AVAILABLE:
+            D("%s: AUDIO_READ_BUFFER_AVAILABLE returns %d", __FUNCTION__,
+               s->read_buffer_available);
+            goldfish_audio_buff_write( s->in_buff );
+	    return s->read_buffer_available;
+
+        default:
+            cpu_abort (cpu_single_env, "goldfish_audio_read: Bad offset %x\n", offset);
+            return 0;
+    }
+}
+
+static void goldfish_audio_write(void *opaque, target_phys_addr_t offset, uint32_t val)
+{
+    struct goldfish_audio_state *s = opaque;
+
+    switch(offset) {
+        case AUDIO_INT_ENABLE:
+            /* enable buffer empty interrupts */
+            D("%s: AUDIO_INT_ENABLE %d", __FUNCTION__, val );
+            enable_audio(s, val);
+            s->int_enable = val;
+            s->int_status = (AUDIO_INT_WRITE_BUFFER_1_EMPTY | AUDIO_INT_WRITE_BUFFER_2_EMPTY);
+            goldfish_device_set_irq(&s->dev, 0, (s->int_status & s->int_enable));
+            break;
+        case AUDIO_SET_WRITE_BUFFER_1:
+            /* save pointer to buffer 1 */
+            D( "%s: AUDIO_SET_WRITE_BUFFER_1 %08x", __FUNCTION__, val);
+            goldfish_audio_buff_set_address( s->out_buff1, val );
+            break;
+        case AUDIO_SET_WRITE_BUFFER_2:
+            /* save pointer to buffer 2 */
+            D( "%s: AUDIO_SET_WRITE_BUFFER_2 %08x", __FUNCTION__, val);
+            goldfish_audio_buff_set_address( s->out_buff2, val );
+            break;
+        case AUDIO_WRITE_BUFFER_1:
+            /* record that data in buffer 1 is ready to write */
+            //D( "%s: AUDIO_WRITE_BUFFER_1 %08x", __FUNCTION__, val);
+            if (s->current_buffer == 0) s->current_buffer = 1;
+            goldfish_audio_buff_set_length( s->out_buff1, val );
+            goldfish_audio_buff_read( s->out_buff1 );
+            s->int_status &= ~AUDIO_INT_WRITE_BUFFER_1_EMPTY;
+            break;
+        case AUDIO_WRITE_BUFFER_2:
+            /* record that data in buffer 2 is ready to write */
+            //D( "%s: AUDIO_WRITE_BUFFER_2 %08x", __FUNCTION__, val);
+            if (s->current_buffer == 0) s->current_buffer = 2;
+            goldfish_audio_buff_set_length( s->out_buff2, val );
+            goldfish_audio_buff_read( s->out_buff2 );
+            s->int_status &= ~AUDIO_INT_WRITE_BUFFER_2_EMPTY;
+            break;
+
+        case AUDIO_SET_READ_BUFFER:
+            /* save pointer to the read buffer */
+            goldfish_audio_buff_set_address( s->in_buff, val );
+            D( "%s: AUDIO_SET_READ_BUFFER %08x", __FUNCTION__, val );
+            break;
+
+        case AUDIO_START_READ:
+            D( "%s: AUDIO_START_READ %d", __FUNCTION__, val );
+            start_read(s, val);
+            s->int_status &= ~AUDIO_INT_READ_BUFFER_FULL;
+            goldfish_device_set_irq(&s->dev, 0, (s->int_status & s->int_enable));
+            break;
+
+        default:
+            cpu_abort (cpu_single_env, "goldfish_audio_write: Bad offset %x\n", offset);
+    }
+}
+
+static void goldfish_audio_callback(void *opaque, int free)
+{
+    struct goldfish_audio_state *s = opaque;
+    int new_status = 0;
+
+    /* loop until free is zero or both buffers are empty */
+    while (free && s->current_buffer) {
+
+        /* write data in buffer 1 */
+        while (free && s->current_buffer == 1) {
+            int  written = goldfish_audio_buff_send( s->out_buff1, free, s );
+            if (written) {
+                D("%s: sent %5d bytes to audio output (buffer 1)", __FUNCTION__, written);
+                free -= written;
+
+                if (goldfish_audio_buff_length( s->out_buff1 ) == 0) {
+                    new_status |= AUDIO_INT_WRITE_BUFFER_1_EMPTY;
+                    s->current_buffer = (goldfish_audio_buff_length( s->out_buff2 ) ? 2 : 0);
+                }
+            } else {
+                break;
+            }
+        }
+
+        /* write data in buffer 2 */
+        while (free && s->current_buffer == 2) {
+            int  written = goldfish_audio_buff_send( s->out_buff2, free, s );
+            if (written) {
+                D("%s: sent %5d bytes to audio output (buffer 2)", __FUNCTION__, written);
+                free -= written;
+
+                if (goldfish_audio_buff_length( s->out_buff2 ) == 0) {
+                    new_status |= AUDIO_INT_WRITE_BUFFER_2_EMPTY;
+                    s->current_buffer = (goldfish_audio_buff_length( s->out_buff1 ) ? 1 : 0);
+                }
+            } else {
+                break;
+            }
+        }
+    }
+
+    if (new_status && new_status != s->int_status) {
+        s->int_status |= new_status;
+        goldfish_device_set_irq(&s->dev, 0, (s->int_status & s->int_enable));
+    }
+}
+
+#if USE_QEMU_AUDIO_IN
+static void
+goldfish_audio_in_callback(void *opaque, int avail)
+{
+    struct goldfish_audio_state *s = opaque;
+    int new_status = 0;
+
+    if (goldfish_audio_buff_available( s->in_buff ) == 0 )
+        return;
+
+    while (avail > 0) {
+        int  read = goldfish_audio_buff_recv( s->in_buff, avail, s );
+        if (read == 0)
+            break;
+
+        avail -= read;
+
+        if (goldfish_audio_buff_available( s->in_buff) == 0) {
+            new_status |= AUDIO_INT_READ_BUFFER_FULL;
+            D("%s: AUDIO_INT_READ_BUFFER_FULL available=%d",
+              __FUNCTION__, goldfish_audio_buff_length( s->in_buff ));
+            break;
+        }
+    }
+
+    if (new_status && new_status != s->int_status) {
+        s->int_status |= new_status;
+        goldfish_device_set_irq(&s->dev, 0, (s->int_status & s->int_enable));
+    }
+}
+#endif /* USE_QEMU_AUDIO_IN */
+
+static CPUReadMemoryFunc *goldfish_audio_readfn[] = {
+   goldfish_audio_read,
+   goldfish_audio_read,
+   goldfish_audio_read
+};
+
+static CPUWriteMemoryFunc *goldfish_audio_writefn[] = {
+   goldfish_audio_write,
+   goldfish_audio_write,
+   goldfish_audio_write
+};
+
+void goldfish_audio_init(uint32_t base, int id, const char* input_source)
+{
+    struct goldfish_audio_state *s;
+    struct audsettings as;
+
+    /* nothing to do if no audio input and output */
+    if (!android_hw->hw_audioOutput && !android_hw->hw_audioInput)
+        return;
+
+    s = (struct goldfish_audio_state *)qemu_mallocz(sizeof(*s));
+    s->dev.name = "goldfish_audio";
+    s->dev.id = id;
+    s->dev.base = base;
+    s->dev.size = 0x1000;
+    s->dev.irq_count = 1;
+
+#ifndef USE_QEMU_AUDIO_IN
+    s->input_fd = -1;
+    if (input_source) {
+        s->input_source = input_source;
+        char* extension = strrchr(input_source, '.');
+        if (extension && strcasecmp(extension, ".wav") == 0) {
+            s->input_is_wav = 1;
+        }
+     }
+#endif
+
+    AUD_register_card( "goldfish_audio", &s->card);
+
+    as.freq = 44100;
+    as.nchannels = 2;
+    as.fmt = AUD_FMT_S16;
+    as.endianness = AUDIO_HOST_ENDIANNESS;
+
+    if (android_hw->hw_audioOutput) {
+        s->voice = AUD_open_out (
+            &s->card,
+            NULL,
+            "goldfish_audio",
+            s,
+            goldfish_audio_callback,
+            &as
+            );
+        if (!s->voice) {
+            dprint("warning: opening audio output failed\n");
+            return;
+        }
+    }
+
+#if USE_QEMU_AUDIO_IN
+    as.freq       = 8000;
+    as.nchannels  = 1;
+    as.fmt        = AUD_FMT_S16;
+    as.endianness = AUDIO_HOST_ENDIANNESS;
+
+    if (android_hw->hw_audioInput) {
+        s->voicein = AUD_open_in (
+            &s->card,
+            NULL,
+            "goldfish_audio_in",
+            s,
+            goldfish_audio_in_callback,
+            &as
+            );
+        if (!s->voicein) {
+            dprint("warning: opening audio input failed\n");
+        }
+    }
+#endif
+
+    goldfish_audio_buff_init( s->out_buff1 );
+    goldfish_audio_buff_init( s->out_buff2 );
+    goldfish_audio_buff_init( s->in_buff );
+
+    goldfish_device_add(&s->dev, goldfish_audio_readfn, goldfish_audio_writefn, s);
+
+    register_savevm( "audio_state", 0, AUDIO_STATE_SAVE_VERSION,
+                     audio_state_save, audio_state_load, s );
+}
+