/* * Copyright © 2013 Mozilla Foundation * * This program is made available under an ISC-style license. See the * accompanying file LICENSE for details. */ #if !defined(NDEBUG) #define NDEBUG #endif #include <assert.h> #include <pthread.h> #include <stdlib.h> #include <time.h> #include <dlfcn.h> #include "android/log.h" #include "cubeb/cubeb.h" #include "cubeb-internal.h" #include "android/audiotrack_definitions.h" #ifndef ALOG #if defined(DEBUG) || defined(FORCE_ALOG) #define ALOG(args...) __android_log_print(ANDROID_LOG_INFO, "Gecko - Cubeb" , ## args) #else #define ALOG(args...) #endif #endif /** * A lot of bytes for safety. It should be possible to bring this down a bit. */ #define SIZE_AUDIOTRACK_INSTANCE 256 /** * call dlsym to get the symbol |mangled_name|, handle the error and store the * pointer in |pointer|. Because depending on Android version, we want different * symbols, not finding a symbol is not an error. */ #define DLSYM_DLERROR(mangled_name, pointer, lib) \ do { \ pointer = dlsym(lib, mangled_name); \ if (!pointer) { \ ALOG("error while loading %stm: %stm\n", mangled_name, dlerror()); \ } else { \ ALOG("%stm: OK", mangled_name); \ } \ } while(0); static struct cubeb_ops const audiotrack_ops; void audiotrack_destroy(cubeb * context); void audiotrack_stream_destroy(cubeb_stream * stream); struct AudioTrack { /* only available on ICS and later. The second int paramter is in fact of type audio_stream_type_t. */ /* static */ status_t (*get_min_frame_count)(int* frame_count, int stream_type, uint32_t rate); /* if we have a recent ctor, but can't find the above symbol, we * can get the minimum frame count with this signature, and we are * running gingerbread. */ /* static */ status_t (*get_min_frame_count_gingerbread)(int* frame_count, int stream_type, uint32_t rate); void* (*ctor)(void* instance, int, unsigned int, int, int, int, unsigned int, void (*)(int, void*, void*), void*, int, int); void* (*dtor)(void* instance); void (*start)(void* instance); void (*pause)(void* instance); uint32_t (*latency)(void* instance); status_t (*check)(void* instance); status_t (*get_position)(void* instance, uint32_t* position); /* static */ int (*get_output_samplingrate)(int* samplerate, int stream); status_t (*set_marker_position)(void* instance, unsigned int); status_t (*set_volume)(void* instance, float left, float right); }; struct cubeb { struct cubeb_ops const * ops; void * library; struct AudioTrack klass; }; struct cubeb_stream { cubeb * context; cubeb_stream_params params; cubeb_data_callback data_callback; cubeb_state_callback state_callback; void * instance; void * user_ptr; /* Number of frames that have been passed to the AudioTrack callback */ long unsigned written; int draining; }; static void audiotrack_refill(int event, void* user, void* info) { cubeb_stream * stream = user; switch (event) { case EVENT_MORE_DATA: { long got = 0; struct Buffer * b = (struct Buffer*)info; if (stream->draining) { return; } got = stream->data_callback(stream, stream->user_ptr, NULL, b->raw, b->frameCount); stream->written += got; if (got != (long)b->frameCount) { stream->draining = 1; /* set a marker so we are notified when the are done draining, that is, * when every frame has been played by android. */ stream->context->klass.set_marker_position(stream->instance, stream->written); } break; } case EVENT_UNDERRUN: ALOG("underrun in cubeb backend."); break; case EVENT_LOOP_END: assert(0 && "We don't support the loop feature of audiotrack."); break; case EVENT_MARKER: assert(stream->draining); stream->state_callback(stream, stream->user_ptr, CUBEB_STATE_DRAINED); break; case EVENT_NEW_POS: assert(0 && "We don't support the setPositionUpdatePeriod feature of audiotrack."); break; case EVENT_BUFFER_END: assert(0 && "Should not happen."); break; } } /* We are running on gingerbread if we found the gingerbread signature for * getMinFrameCount */ static int audiotrack_version_is_gingerbread(cubeb * ctx) { return ctx->klass.get_min_frame_count_gingerbread != NULL; } int audiotrack_get_min_frame_count(cubeb * ctx, cubeb_stream_params * params, int * min_frame_count) { status_t status; /* Recent Android have a getMinFrameCount method. */ if (!audiotrack_version_is_gingerbread(ctx)) { status = ctx->klass.get_min_frame_count(min_frame_count, params->stream_type, params->rate); } else { status = ctx->klass.get_min_frame_count_gingerbread(min_frame_count, params->stream_type, params->rate); } if (status != 0) { ALOG("error getting the min frame count"); return CUBEB_ERROR; } return CUBEB_OK; } int audiotrack_init(cubeb ** context, char const * context_name) { cubeb * ctx; struct AudioTrack* c; assert(context); *context = NULL; ctx = calloc(1, sizeof(*ctx)); assert(ctx); /* If we use an absolute path here ("/system/lib/libmedia.so"), and on Android * 2.2, the dlopen succeeds, all the dlsym succeed, but a segfault happens on * the first call to a dlsym'ed function. Somehow this does not happen when * using only the name of the library. */ ctx->library = dlopen("libmedia.so", RTLD_LAZY); if (!ctx->library) { ALOG("dlopen error: %s.", dlerror()); free(ctx); return CUBEB_ERROR; } /* Recent Android first, then Gingerbread. */ DLSYM_DLERROR("_ZN7android10AudioTrackC1EijiiijPFviPvS1_ES1_ii", ctx->klass.ctor, ctx->library); DLSYM_DLERROR("_ZN7android10AudioTrackD1Ev", ctx->klass.dtor, ctx->library); DLSYM_DLERROR("_ZNK7android10AudioTrack7latencyEv", ctx->klass.latency, ctx->library); DLSYM_DLERROR("_ZNK7android10AudioTrack9initCheckEv", ctx->klass.check, ctx->library); DLSYM_DLERROR("_ZN7android11AudioSystem21getOutputSamplingRateEPii", ctx->klass.get_output_samplingrate, ctx->library); /* |getMinFrameCount| is available on gingerbread and ICS with different signatures. */ DLSYM_DLERROR("_ZN7android10AudioTrack16getMinFrameCountEPi19audio_stream_type_tj", ctx->klass.get_min_frame_count, ctx->library); if (!ctx->klass.get_min_frame_count) { DLSYM_DLERROR("_ZN7android10AudioTrack16getMinFrameCountEPiij", ctx->klass.get_min_frame_count_gingerbread, ctx->library); } DLSYM_DLERROR("_ZN7android10AudioTrack5startEv", ctx->klass.start, ctx->library); DLSYM_DLERROR("_ZN7android10AudioTrack5pauseEv", ctx->klass.pause, ctx->library); DLSYM_DLERROR("_ZN7android10AudioTrack11getPositionEPj", ctx->klass.get_position, ctx->library); DLSYM_DLERROR("_ZN7android10AudioTrack17setMarkerPositionEj", ctx->klass.set_marker_position, ctx->library); DLSYM_DLERROR("_ZN7android10AudioTrack9setVolumeEff", ctx->klass.set_volume, ctx->library); /* check that we have a combination of symbol that makes sense */ c = &ctx->klass; if(!(c->ctor && c->dtor && c->latency && c->check && /* at least one way to get the minimum frame count to request. */ (c->get_min_frame_count || c->get_min_frame_count_gingerbread) && c->start && c->pause && c->get_position && c->set_marker_position)) { ALOG("Could not find all the symbols we need."); audiotrack_destroy(ctx); return CUBEB_ERROR; } ctx->ops = &audiotrack_ops; *context = ctx; return CUBEB_OK; } char const * audiotrack_get_backend_id(cubeb * context) { return "audiotrack"; } static int audiotrack_get_max_channel_count(cubeb * ctx, uint32_t * max_channels) { assert(ctx && max_channels); /* The android mixer handles up to two channels, see http://androidxref.com/4.2.2_r1/xref/frameworks/av/services/audioflinger/AudioFlinger.h#67 */ *max_channels = 2; return CUBEB_OK; } static int audiotrack_get_min_latency(cubeb * ctx, cubeb_stream_params params, uint32_t * latency_ms) { /* We always use the lowest latency possible when using this backend (see * audiotrack_stream_init), so this value is not going to be used. */ int r; r = audiotrack_get_min_frame_count(ctx, ¶ms, (int *)latency_ms); if (r != CUBEB_OK) { return CUBEB_ERROR; } return CUBEB_OK; } static int audiotrack_get_preferred_sample_rate(cubeb * ctx, uint32_t * rate) { status_t r; r = ctx->klass.get_output_samplingrate((int32_t *)rate, 3 /* MUSIC */); return r == 0 ? CUBEB_OK : CUBEB_ERROR; } void audiotrack_destroy(cubeb * context) { assert(context); dlclose(context->library); free(context); } int audiotrack_stream_init(cubeb * ctx, cubeb_stream ** stream, char const * stream_name, cubeb_devid input_device, cubeb_stream_params * input_stream_params, cubeb_devid output_device, cubeb_stream_params * output_stream_params, unsigned int latency, cubeb_data_callback data_callback, cubeb_state_callback state_callback, void * user_ptr) { cubeb_stream * stm; int32_t channels; uint32_t min_frame_count; assert(ctx && stream); assert(!input_stream_params && "not supported"); if (input_device || output_device) { /* Device selection not yet implemented. */ return CUBEB_ERROR_DEVICE_UNAVAILABLE; } if (output_stream_params->format == CUBEB_SAMPLE_FLOAT32LE || output_stream_params->format == CUBEB_SAMPLE_FLOAT32BE) { return CUBEB_ERROR_INVALID_FORMAT; } if (audiotrack_get_min_frame_count(ctx, output_stream_params, (int *)&min_frame_count)) { return CUBEB_ERROR; } stm = calloc(1, sizeof(*stm)); assert(stm); stm->context = ctx; stm->data_callback = data_callback; stm->state_callback = state_callback; stm->user_ptr = user_ptr; stm->params = *output_stream_params; stm->instance = calloc(SIZE_AUDIOTRACK_INSTANCE, 1); (*(uint32_t*)((intptr_t)stm->instance + SIZE_AUDIOTRACK_INSTANCE - 4)) = 0xbaadbaad; assert(stm->instance && "cubeb: EOM"); /* gingerbread uses old channel layout enum */ if (audiotrack_version_is_gingerbread(ctx)) { channels = stm->params.channels == 2 ? AUDIO_CHANNEL_OUT_STEREO_Legacy : AUDIO_CHANNEL_OUT_MONO_Legacy; } else { channels = stm->params.channels == 2 ? AUDIO_CHANNEL_OUT_STEREO_ICS : AUDIO_CHANNEL_OUT_MONO_ICS; } ctx->klass.ctor(stm->instance, stm->params.stream_type, stm->params.rate, AUDIO_FORMAT_PCM_16_BIT, channels, min_frame_count, 0, audiotrack_refill, stm, 0, 0); assert((*(uint32_t*)((intptr_t)stm->instance + SIZE_AUDIOTRACK_INSTANCE - 4)) == 0xbaadbaad); if (ctx->klass.check(stm->instance)) { ALOG("stream not initialized properly."); audiotrack_stream_destroy(stm); return CUBEB_ERROR; } *stream = stm; return CUBEB_OK; } void audiotrack_stream_destroy(cubeb_stream * stream) { assert(stream->context); stream->context->klass.dtor(stream->instance); free(stream->instance); stream->instance = NULL; free(stream); } int audiotrack_stream_start(cubeb_stream * stream) { assert(stream->instance); stream->context->klass.start(stream->instance); stream->state_callback(stream, stream->user_ptr, CUBEB_STATE_STARTED); return CUBEB_OK; } int audiotrack_stream_stop(cubeb_stream * stream) { assert(stream->instance); stream->context->klass.pause(stream->instance); stream->state_callback(stream, stream->user_ptr, CUBEB_STATE_STOPPED); return CUBEB_OK; } int audiotrack_stream_get_position(cubeb_stream * stream, uint64_t * position) { uint32_t p; assert(stream->instance && position); stream->context->klass.get_position(stream->instance, &p); *position = p; return CUBEB_OK; } int audiotrack_stream_get_latency(cubeb_stream * stream, uint32_t * latency) { assert(stream->instance && latency); /* Android returns the latency in ms, we want it in frames. */ *latency = stream->context->klass.latency(stream->instance); /* with rate <= 96000, we won't overflow until 44.739 seconds of latency */ *latency = (*latency * stream->params.rate) / 1000; return 0; } int audiotrack_stream_set_volume(cubeb_stream * stream, float volume) { status_t status; status = stream->context->klass.set_volume(stream->instance, volume, volume); if (status) { return CUBEB_ERROR; } return CUBEB_OK; } static struct cubeb_ops const audiotrack_ops = { .init = audiotrack_init, .get_backend_id = audiotrack_get_backend_id, .get_max_channel_count = audiotrack_get_max_channel_count, .get_min_latency = audiotrack_get_min_latency, .get_preferred_sample_rate = audiotrack_get_preferred_sample_rate, .enumerate_devices = NULL, .destroy = audiotrack_destroy, .stream_init = audiotrack_stream_init, .stream_destroy = audiotrack_stream_destroy, .stream_start = audiotrack_stream_start, .stream_stop = audiotrack_stream_stop, .stream_get_position = audiotrack_stream_get_position, .stream_get_latency = audiotrack_stream_get_latency, .stream_set_volume = audiotrack_stream_set_volume, .stream_set_panning = NULL, .stream_get_current_device = NULL, .stream_device_destroy = NULL, .stream_register_device_changed_callback = NULL, .register_device_collection_changed = NULL };