AudioFileReaderGStreamer.cpp [plain text]
#include "config.h"
#if ENABLE(WEB_AUDIO)
#include "AudioFileReader.h"
#include "AudioBus.h"
#include <gio/gio.h>
#include <gst/app/gstappsink.h>
#include <gst/audio/multichannel.h>
#include <gst/gst.h>
#include <gst/pbutils/pbutils.h>
#include <wtf/Noncopyable.h>
#include <wtf/PassOwnPtr.h>
#include <wtf/gobject/GOwnPtr.h>
#include <wtf/gobject/GRefPtr.h>
namespace WebCore {
class AudioFileReader {
WTF_MAKE_NONCOPYABLE(AudioFileReader);
public:
AudioFileReader(const char* filePath);
AudioFileReader(const void* data, size_t dataSize);
~AudioFileReader();
PassOwnPtr<AudioBus> createBus(float sampleRate, bool mixToMono);
GstFlowReturn handleBuffer(GstAppSink*);
gboolean handleMessage(GstMessage*);
void handleNewDeinterleavePad(GstPad*);
void deinterleavePadsConfigured();
void plugDeinterleave(GstPad*);
void decodeAudioForBusCreation();
private:
const void* m_data;
size_t m_dataSize;
const char* m_filePath;
float m_sampleRate;
GstBufferList* m_frontLeftBuffers;
GstBufferListIterator* m_frontLeftBuffersIterator;
GstBufferList* m_frontRightBuffers;
GstBufferListIterator* m_frontRightBuffersIterator;
GstElement* m_pipeline;
unsigned m_channelSize;
GRefPtr<GstElement> m_decodebin;
GRefPtr<GstElement> m_deInterleave;
GRefPtr<GMainLoop> m_loop;
};
static GstCaps* getGStreamerAudioCaps(int channels, float sampleRate)
{
return gst_caps_new_simple("audio/x-raw-float", "rate", G_TYPE_INT, static_cast<int>(sampleRate), "channels", G_TYPE_INT, channels, "endianness", G_TYPE_INT, G_BYTE_ORDER, "width", G_TYPE_INT, 32, NULL);
}
static void copyGstreamerBuffersToAudioChannel(GstBufferList* buffers, AudioChannel* audioChannel)
{
GstBufferListIterator* iter = gst_buffer_list_iterate(buffers);
gst_buffer_list_iterator_next_group(iter);
GstBuffer* buffer = gst_buffer_list_iterator_merge_group(iter);
if (buffer) {
memcpy(audioChannel->mutableData(), reinterpret_cast<float*>(GST_BUFFER_DATA(buffer)), GST_BUFFER_SIZE(buffer));
gst_buffer_unref(buffer);
}
gst_buffer_list_iterator_free(iter);
}
static GstFlowReturn onAppsinkNewBufferCallback(GstAppSink* sink, gpointer userData)
{
return static_cast<AudioFileReader*>(userData)->handleBuffer(sink);
}
gboolean messageCallback(GstBus* bus, GstMessage* message, AudioFileReader* reader)
{
return reader->handleMessage(message);
}
static void onGStreamerDeinterleavePadAddedCallback(GstElement* element, GstPad* pad, AudioFileReader* reader)
{
reader->handleNewDeinterleavePad(pad);
}
static void onGStreamerDeinterleaveReadyCallback(GstElement* element, AudioFileReader* reader)
{
reader->deinterleavePadsConfigured();
}
static void onGStreamerDecodebinPadAddedCallback(GstElement* element, GstPad* pad, AudioFileReader* reader)
{
reader->plugDeinterleave(pad);
}
gboolean enteredMainLoopCallback(gpointer userData)
{
AudioFileReader* reader = reinterpret_cast<AudioFileReader*>(userData);
reader->decodeAudioForBusCreation();
return FALSE;
}
AudioFileReader::AudioFileReader(const char* filePath)
: m_data(0)
, m_dataSize(0)
, m_filePath(filePath)
, m_channelSize(0)
{
}
AudioFileReader::AudioFileReader(const void* data, size_t dataSize)
: m_data(data)
, m_dataSize(dataSize)
, m_filePath(0)
, m_channelSize(0)
{
}
AudioFileReader::~AudioFileReader()
{
}
GstFlowReturn AudioFileReader::handleBuffer(GstAppSink* sink)
{
GstBuffer* buffer = gst_app_sink_pull_buffer(sink);
if (!buffer)
return GST_FLOW_ERROR;
GstCaps* caps = gst_buffer_get_caps(buffer);
GstStructure* structure = gst_caps_get_structure(caps, 0);
gint channels = 0;
if (!gst_structure_get_int(structure, "channels", &channels) || !channels) {
gst_caps_unref(caps);
gst_buffer_unref(buffer);
return GST_FLOW_ERROR;
}
gint sampleRate = 0;
if (!gst_structure_get_int(structure, "rate", &sampleRate) || !sampleRate) {
gst_caps_unref(caps);
gst_buffer_unref(buffer);
return GST_FLOW_ERROR;
}
gint width = 0;
if (!gst_structure_get_int(structure, "width", &width) || !width) {
gst_caps_unref(caps);
gst_buffer_unref(buffer);
return GST_FLOW_ERROR;
}
GstClockTime duration = (static_cast<guint64>(GST_BUFFER_SIZE(buffer)) * 8 * GST_SECOND) / (sampleRate * channels * width);
int frames = GST_CLOCK_TIME_TO_FRAMES(duration, sampleRate);
GstAudioChannelPosition* positions = gst_audio_get_channel_positions(structure);
switch (positions[0]) {
case GST_AUDIO_CHANNEL_POSITION_FRONT_LEFT:
gst_buffer_list_iterator_add(m_frontLeftBuffersIterator, buffer);
m_channelSize += frames;
break;
case GST_AUDIO_CHANNEL_POSITION_FRONT_RIGHT:
gst_buffer_list_iterator_add(m_frontRightBuffersIterator, buffer);
break;
default:
gst_buffer_unref(buffer);
break;
}
g_free(positions);
gst_caps_unref(caps);
return GST_FLOW_OK;
}
gboolean AudioFileReader::handleMessage(GstMessage* message)
{
GOwnPtr<GError> error;
GOwnPtr<gchar> debug;
switch (GST_MESSAGE_TYPE(message)) {
case GST_MESSAGE_EOS:
g_main_loop_quit(m_loop.get());
break;
case GST_MESSAGE_WARNING:
gst_message_parse_warning(message, &error.outPtr(), &debug.outPtr());
g_warning("Warning: %d, %s", error->code, error->message);
break;
case GST_MESSAGE_ERROR:
gst_message_parse_error(message, &error.outPtr(), &debug.outPtr());
ASSERT_WITH_MESSAGE(0, "Fatal error: %d, %s", error->code, error->message);
break;
default:
break;
}
return TRUE;
}
void AudioFileReader::handleNewDeinterleavePad(GstPad* pad)
{
GstElement* queue = gst_element_factory_make("queue", 0);
GstElement* sink = gst_element_factory_make("appsink", 0);
GstAppSinkCallbacks callbacks;
callbacks.eos = 0;
callbacks.new_preroll = 0;
callbacks.new_buffer_list = 0;
callbacks.new_buffer = onAppsinkNewBufferCallback;
gst_app_sink_set_callbacks(GST_APP_SINK(sink), &callbacks, this, 0);
g_object_set(sink, "sync", FALSE, NULL);
GstCaps* caps = getGStreamerAudioCaps(1, m_sampleRate);
gst_app_sink_set_caps(GST_APP_SINK(sink), caps);
gst_caps_unref(caps);
gst_bin_add_many(GST_BIN(m_pipeline), queue, sink, NULL);
GstPad* sinkPad = gst_element_get_static_pad(queue, "sink");
gst_pad_link(pad, sinkPad);
gst_object_unref(GST_OBJECT(sinkPad));
gst_element_link_pads_full(queue, "src", sink, "sink", GST_PAD_LINK_CHECK_NOTHING);
gst_element_set_state(queue, GST_STATE_READY);
gst_element_set_state(sink, GST_STATE_READY);
}
void AudioFileReader::deinterleavePadsConfigured()
{
gst_element_set_state(m_pipeline, GST_STATE_PLAYING);
}
void AudioFileReader::plugDeinterleave(GstPad* pad)
{
GstElement* audioConvert = gst_element_factory_make("audioconvert", 0);
GstElement* audioResample = gst_element_factory_make("audioresample", 0);
GstElement* capsFilter = gst_element_factory_make("capsfilter", 0);
m_deInterleave = gst_element_factory_make("deinterleave", "deinterleave");
g_object_set(m_deInterleave.get(), "keep-positions", TRUE, NULL);
g_signal_connect(m_deInterleave.get(), "pad-added", G_CALLBACK(onGStreamerDeinterleavePadAddedCallback), this);
g_signal_connect(m_deInterleave.get(), "no-more-pads", G_CALLBACK(onGStreamerDeinterleaveReadyCallback), this);
GstCaps* caps = getGStreamerAudioCaps(2, m_sampleRate);
g_object_set(capsFilter, "caps", caps, NULL);
gst_caps_unref(caps);
gst_bin_add_many(GST_BIN(m_pipeline), audioConvert, audioResample, capsFilter, m_deInterleave.get(), NULL);
GstPad* sinkPad = gst_element_get_static_pad(audioConvert, "sink");
gst_pad_link(pad, sinkPad);
gst_object_unref(GST_OBJECT(sinkPad));
gst_element_link_pads_full(audioConvert, "src", audioResample, "sink", GST_PAD_LINK_CHECK_NOTHING);
gst_element_link_pads_full(audioResample, "src", capsFilter, "sink", GST_PAD_LINK_CHECK_NOTHING);
gst_element_link_pads_full(capsFilter, "src", m_deInterleave.get(), "sink", GST_PAD_LINK_CHECK_NOTHING);
gst_element_sync_state_with_parent(audioConvert);
gst_element_sync_state_with_parent(audioResample);
gst_element_sync_state_with_parent(capsFilter);
gst_element_sync_state_with_parent(m_deInterleave.get());
}
void AudioFileReader::decodeAudioForBusCreation()
{
m_pipeline = gst_pipeline_new(0);
GRefPtr<GstBus> bus = gst_pipeline_get_bus(GST_PIPELINE(m_pipeline));
gst_bus_add_signal_watch(bus.get());
g_signal_connect(bus.get(), "message", G_CALLBACK(messageCallback), this);
GstElement* source;
if (m_data) {
ASSERT(m_dataSize);
source = gst_element_factory_make("giostreamsrc", 0);
GRefPtr<GInputStream> memoryStream = g_memory_input_stream_new_from_data(m_data, m_dataSize, 0);
g_object_set(source, "stream", memoryStream.get(), NULL);
} else {
source = gst_element_factory_make("filesrc", 0);
g_object_set(source, "location", m_filePath, NULL);
}
m_decodebin = gst_element_factory_make("decodebin2", "decodebin");
g_signal_connect(m_decodebin.get(), "pad-added", G_CALLBACK(onGStreamerDecodebinPadAddedCallback), this);
gst_bin_add_many(GST_BIN(m_pipeline), source, m_decodebin.get(), NULL);
gst_element_link_pads_full(source, "src", m_decodebin.get(), "sink", GST_PAD_LINK_CHECK_NOTHING);
gst_element_set_state(m_pipeline, GST_STATE_PAUSED);
}
PassOwnPtr<AudioBus> AudioFileReader::createBus(float sampleRate, bool mixToMono)
{
m_sampleRate = sampleRate;
m_frontLeftBuffers = gst_buffer_list_new();
m_frontLeftBuffersIterator = gst_buffer_list_iterate(m_frontLeftBuffers);
gst_buffer_list_iterator_add_group(m_frontLeftBuffersIterator);
m_frontRightBuffers = gst_buffer_list_new();
m_frontRightBuffersIterator = gst_buffer_list_iterate(m_frontRightBuffers);
gst_buffer_list_iterator_add_group(m_frontRightBuffersIterator);
GRefPtr<GMainContext> context = g_main_context_new();
g_main_context_push_thread_default(context.get());
m_loop = adoptGRef(g_main_loop_new(context.get(), FALSE));
GSource* timeoutSource = g_timeout_source_new(0);
g_source_attach(timeoutSource, context.get());
g_source_set_callback(timeoutSource, reinterpret_cast<GSourceFunc>(enteredMainLoopCallback), this, 0);
g_main_loop_run(m_loop.get());
g_main_context_pop_thread_default(context.get());
GRefPtr<GstBus> bus = gst_pipeline_get_bus(GST_PIPELINE(m_pipeline));
g_signal_handlers_disconnect_by_func(bus.get(), reinterpret_cast<gpointer>(messageCallback), this);
g_signal_handlers_disconnect_by_func(m_decodebin.get(), reinterpret_cast<gpointer>(onGStreamerDecodebinPadAddedCallback), this);
g_signal_handlers_disconnect_by_func(m_deInterleave.get(), reinterpret_cast<gpointer>(onGStreamerDeinterleavePadAddedCallback), this);
g_signal_handlers_disconnect_by_func(m_deInterleave.get(), reinterpret_cast<gpointer>(onGStreamerDeinterleaveReadyCallback), this);
unsigned channels = mixToMono ? 1 : 2;
OwnPtr<AudioBus> audioBus = adoptPtr(new AudioBus(channels, m_channelSize, true));
audioBus->setSampleRate(m_sampleRate);
copyGstreamerBuffersToAudioChannel(m_frontLeftBuffers, audioBus->channel(0));
if (!mixToMono)
copyGstreamerBuffersToAudioChannel(m_frontRightBuffers, audioBus->channel(1));
gst_buffer_list_iterator_free(m_frontLeftBuffersIterator);
gst_buffer_list_iterator_free(m_frontRightBuffersIterator);
gst_buffer_list_unref(m_frontLeftBuffers);
gst_buffer_list_unref(m_frontRightBuffers);
gst_element_set_state(m_pipeline, GST_STATE_NULL);
gst_object_unref(GST_OBJECT(m_pipeline));
m_decodebin.clear();
m_deInterleave.clear();
return audioBus.release();
}
PassOwnPtr<AudioBus> createBusFromAudioFile(const char* filePath, bool mixToMono, float sampleRate)
{
return AudioFileReader(filePath).createBus(sampleRate, mixToMono);
}
PassOwnPtr<AudioBus> createBusFromInMemoryAudioFile(const void* data, size_t dataSize, bool mixToMono, float sampleRate)
{
return AudioFileReader(data, dataSize).createBus(sampleRate, mixToMono);
}
}
#endif // ENABLE(WEB_AUDIO)