diff options
Diffstat (limited to 'media/libcubeb/src/cubeb_audiotrack.c')
| -rw-r--r-- | media/libcubeb/src/cubeb_audiotrack.c | 438 |
1 files changed, 438 insertions, 0 deletions
diff --git a/media/libcubeb/src/cubeb_audiotrack.c b/media/libcubeb/src/cubeb_audiotrack.c new file mode 100644 index 000000000..fe2603405 --- /dev/null +++ b/media/libcubeb/src/cubeb_audiotrack.c @@ -0,0 +1,438 @@ +/* + * 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 +}; |