1 files changed, 265 insertions, 0 deletions
diff --git a/audio/out/ao_opensles.c b/audio/out/ao_opensles.c
new file mode 100644
index 0000000..ddcff19
--- /dev/null
+++ b/audio/out/ao_opensles.c
@@ -0,0 +1,265 @@
+/*
+ * OpenSL ES audio output driver.
+ * Copyright (C) 2016 Ilya Zhuravlev <whatever@xyz.is>
+ *
+ * This file is part of mpv.
+ *
+ * mpv is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * mpv 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 Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with mpv.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "ao.h"
+#include "internal.h"
+#include "common/msg.h"
+#include "audio/format.h"
+#include "options/m_option.h"
+#include "osdep/threads.h"
+#include "osdep/timer.h"
+
+#include <SLES/OpenSLES.h>
+#include <SLES/OpenSLES_Android.h>
+
+struct priv {
+    SLObjectItf sl, output_mix, player;
+    SLBufferQueueItf buffer_queue;
+    SLEngineItf engine;
+    SLPlayItf play;
+    void *buf;
+    int bytes_per_enqueue;
+    mp_mutex buffer_lock;
+    double audio_latency;
+
+    int frames_per_enqueue;
+    int buffer_size_in_ms;
+};
+
+#define DESTROY(thing) \
+    if (p->thing) { \
+        (*p->thing)->Destroy(p->thing); \
+        p->thing = NULL; \
+    }
+
+static void uninit(struct ao *ao)
+{
+    struct priv *p = ao->priv;
+
+    DESTROY(player);
+    DESTROY(output_mix);
+    DESTROY(sl);
+
+    p->buffer_queue = NULL;
+    p->engine = NULL;
+    p->play = NULL;
+
+    mp_mutex_destroy(&p->buffer_lock);
+
+    free(p->buf);
+    p->buf = NULL;
+}
+
+#undef DESTROY
+
+static void buffer_callback(SLBufferQueueItf buffer_queue, void *context)
+{
+    struct ao *ao = context;
+    struct priv *p = ao->priv;
+    SLresult res;
+    double delay;
+
+    mp_mutex_lock(&p->buffer_lock);
+
+    delay = p->frames_per_enqueue / (double)ao->samplerate;
+    delay += p->audio_latency;
+    ao_read_data(ao, &p->buf, p->frames_per_enqueue,
+        mp_time_ns() + MP_TIME_S_TO_NS(delay));
+
+    res = (*buffer_queue)->Enqueue(buffer_queue, p->buf, p->bytes_per_enqueue);
+    if (res != SL_RESULT_SUCCESS)
+        MP_ERR(ao, "Failed to Enqueue: %d\n", res);
+
+    mp_mutex_unlock(&p->buffer_lock);
+}
+
+#define CHK(stmt) \
+    { \
+        SLresult res = stmt; \
+        if (res != SL_RESULT_SUCCESS) { \
+            MP_ERR(ao, "%s: %d\n", #stmt, res); \
+            goto error; \
+        } \
+    }
+
+static int init(struct ao *ao)
+{
+    struct priv *p = ao->priv;
+    SLDataLocator_BufferQueue locator_buffer_queue;
+    SLDataLocator_OutputMix locator_output_mix;
+    SLAndroidDataFormat_PCM_EX pcm;
+    SLDataSource audio_source;
+    SLDataSink audio_sink;
+
+    // This AO only supports two channels at the moment
+    mp_chmap_from_channels(&ao->channels, 2);
+    // Upstream "Wilhelm" supports only 8000 <= rate <= 192000
+    ao->samplerate = MPCLAMP(ao->samplerate, 8000, 192000);
+
+    CHK(slCreateEngine(&p->sl, 0, NULL, 0, NULL, NULL));
+    CHK((*p->sl)->Realize(p->sl, SL_BOOLEAN_FALSE));
+    CHK((*p->sl)->GetInterface(p->sl, SL_IID_ENGINE, (void*)&p->engine));
+    CHK((*p->engine)->CreateOutputMix(p->engine, &p->output_mix, 0, NULL, NULL));
+    CHK((*p->output_mix)->Realize(p->output_mix, SL_BOOLEAN_FALSE));
+
+    locator_buffer_queue.locatorType = SL_DATALOCATOR_BUFFERQUEUE;
+    locator_buffer_queue.numBuffers = 8;
+
+    if (af_fmt_is_int(ao->format)) {
+        // Be future-proof
+        if (af_fmt_to_bytes(ao->format) > 2)
+            ao->format = AF_FORMAT_S32;
+        else
+            ao->format = af_fmt_from_planar(ao->format);
+        pcm.formatType = SL_DATAFORMAT_PCM;
+    } else {
+        ao->format = AF_FORMAT_FLOAT;
+        pcm.formatType = SL_ANDROID_DATAFORMAT_PCM_EX;
+        pcm.representation = SL_ANDROID_PCM_REPRESENTATION_FLOAT;
+    }
+    pcm.numChannels = ao->channels.num;
+    pcm.containerSize = pcm.bitsPerSample = 8 * af_fmt_to_bytes(ao->format);
+    pcm.channelMask = SL_SPEAKER_FRONT_LEFT | SL_SPEAKER_FRONT_RIGHT;
+    pcm.endianness = SL_BYTEORDER_LITTLEENDIAN;
+    pcm.sampleRate = ao->samplerate * 1000;
+
+    if (p->buffer_size_in_ms) {
+        ao->device_buffer = ao->samplerate * p->buffer_size_in_ms / 1000;
+        // As the purpose of buffer_size_in_ms is to request a specific
+        // soft buffer size:
+        ao->def_buffer = 0;
+    }
+
+    // But it does not make sense if it is smaller than the enqueue size:
+    if (p->frames_per_enqueue) {
+        ao->device_buffer = MPMAX(ao->device_buffer, p->frames_per_enqueue);
+    } else {
+        if (ao->device_buffer) {
+            p->frames_per_enqueue = ao->device_buffer;
+        } else if (ao->def_buffer) {
+            p->frames_per_enqueue = ao->def_buffer * ao->samplerate;
+        } else {
+            MP_ERR(ao, "Enqueue size is not set and can neither be derived\n");
+            goto error;
+        }
+    }
+
+    p->bytes_per_enqueue = p->frames_per_enqueue * ao->channels.num *
+        af_fmt_to_bytes(ao->format);
+    p->buf = calloc(1, p->bytes_per_enqueue);
+    if (!p->buf) {
+        MP_ERR(ao, "Failed to allocate device buffer\n");
+        goto error;
+    }
+
+    int r = mp_mutex_init(&p->buffer_lock);
+    if (r) {
+        MP_ERR(ao, "Failed to initialize the mutex: %d\n", r);
+        goto error;
+    }
+
+    audio_source.pFormat = (void*)&pcm;
+    audio_source.pLocator = (void*)&locator_buffer_queue;
+
+    locator_output_mix.locatorType = SL_DATALOCATOR_OUTPUTMIX;
+    locator_output_mix.outputMix = p->output_mix;
+
+    audio_sink.pLocator = (void*)&locator_output_mix;
+    audio_sink.pFormat = NULL;
+
+    SLInterfaceID iid_array[] = { SL_IID_BUFFERQUEUE, SL_IID_ANDROIDCONFIGURATION };
+    SLboolean required[] = { SL_BOOLEAN_TRUE, SL_BOOLEAN_FALSE };
+    CHK((*p->engine)->CreateAudioPlayer(p->engine, &p->player, &audio_source,
+        &audio_sink, 2, iid_array, required));
+
+    CHK((*p->player)->Realize(p->player, SL_BOOLEAN_FALSE));
+    CHK((*p->player)->GetInterface(p->player, SL_IID_PLAY, (void*)&p->play));
+    CHK((*p->player)->GetInterface(p->player, SL_IID_BUFFERQUEUE,
+        (void*)&p->buffer_queue));
+    CHK((*p->buffer_queue)->RegisterCallback(p->buffer_queue,
+        buffer_callback, ao));
+    CHK((*p->play)->SetPlayState(p->play, SL_PLAYSTATE_PLAYING));
+
+    SLAndroidConfigurationItf android_config;
+    SLuint32 audio_latency = 0, value_size = sizeof(SLuint32);
+
+    SLint32 get_interface_result = (*p->player)->GetInterface(
+        p->player,
+        SL_IID_ANDROIDCONFIGURATION,
+        &android_config
+    );
+
+    if (get_interface_result == SL_RESULT_SUCCESS) {
+        SLint32 get_configuration_result = (*android_config)->GetConfiguration(
+            android_config,
+            (const SLchar *)"androidGetAudioLatency",
+            &value_size,
+            &audio_latency
+        );
+
+        if (get_configuration_result == SL_RESULT_SUCCESS) {
+            p->audio_latency = (double)audio_latency / 1000.0;
+            MP_INFO(ao, "Device latency is %f\n", p->audio_latency);
+        }
+    }
+
+    return 1;
+error:
+    uninit(ao);
+    return -1;
+}
+
+#undef CHK
+
+static void reset(struct ao *ao)
+{
+    struct priv *p = ao->priv;
+    (*p->buffer_queue)->Clear(p->buffer_queue);
+}
+
+static void resume(struct ao *ao)
+{
+    struct priv *p = ao->priv;
+    buffer_callback(p->buffer_queue, ao);
+}
+
+#define OPT_BASE_STRUCT struct priv
+
+const struct ao_driver audio_out_opensles = {
+    .description = "OpenSL ES audio output",
+    .name      = "opensles",
+    .init      = init,
+    .uninit    = uninit,
+    .reset     = reset,
+    .start     = resume,
+
+    .priv_size = sizeof(struct priv),
+    .priv_defaults = &(const struct priv) {
+        .buffer_size_in_ms = 250,
+    },
+    .options = (const struct m_option[]) {
+        {"frames-per-enqueue", OPT_INT(frames_per_enqueue),
+            M_RANGE(1, 96000)},
+        {"buffer-size-in-ms", OPT_INT(buffer_size_in_ms),
+            M_RANGE(0, 500)},
+        {0}
+    },
+    .options_prefix = "opensles",
+};