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/*
* Copyright (C) 2010 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "VorbisDecoder.h"
#include <media/stagefright/MediaBufferGroup.h>
#include <media/stagefright/MediaDebug.h>
#include <media/stagefright/MediaDefs.h>
#include <media/stagefright/MediaErrors.h>
#include <media/stagefright/MetaData.h>
extern "C" {
#include <Tremolo/codec_internal.h>
int _vorbis_unpack_books(vorbis_info *vi,oggpack_buffer *opb);
int _vorbis_unpack_info(vorbis_info *vi,oggpack_buffer *opb);
int _vorbis_unpack_comment(vorbis_comment *vc,oggpack_buffer *opb);
}
namespace android {
VorbisDecoder::VorbisDecoder(const sp<MediaSource> &source)
: mSource(source),
mStarted(false),
mBufferGroup(NULL),
mAnchorTimeUs(0),
mNumFramesOutput(0),
mState(NULL),
mVi(NULL) {
sp<MetaData> srcFormat = mSource->getFormat();
CHECK(srcFormat->findInt32(kKeyChannelCount, &mNumChannels));
CHECK(srcFormat->findInt32(kKeySampleRate, &mSampleRate));
}
VorbisDecoder::~VorbisDecoder() {
if (mStarted) {
stop();
}
}
static void makeBitReader(
const void *data, size_t size,
ogg_buffer *buf, ogg_reference *ref, oggpack_buffer *bits) {
buf->data = (uint8_t *)data;
buf->size = size;
buf->refcount = 1;
buf->ptr.owner = NULL;
ref->buffer = buf;
ref->begin = 0;
ref->length = size;
ref->next = NULL;
oggpack_readinit(bits, ref);
}
status_t VorbisDecoder::start(MetaData *params) {
CHECK(!mStarted);
mBufferGroup = new MediaBufferGroup;
mBufferGroup->add_buffer(
new MediaBuffer(kMaxNumSamplesPerBuffer * sizeof(int16_t)));
mSource->start();
sp<MetaData> meta = mSource->getFormat();
mVi = new vorbis_info;
vorbis_info_init(mVi);
///////////////////////////////////////////////////////////////////////////
uint32_t type;
const void *data;
size_t size;
CHECK(meta->findData(kKeyVorbisInfo, &type, &data, &size));
ogg_buffer buf;
ogg_reference ref;
oggpack_buffer bits;
makeBitReader((const uint8_t *)data + 7, size - 7, &buf, &ref, &bits);
CHECK_EQ(0, _vorbis_unpack_info(mVi, &bits));
///////////////////////////////////////////////////////////////////////////
CHECK(meta->findData(kKeyVorbisBooks, &type, &data, &size));
makeBitReader((const uint8_t *)data + 7, size - 7, &buf, &ref, &bits);
CHECK_EQ(0, _vorbis_unpack_books(mVi, &bits));
///////////////////////////////////////////////////////////////////////////
mState = new vorbis_dsp_state;
CHECK_EQ(0, vorbis_dsp_init(mState, mVi));
mAnchorTimeUs = 0;
mNumFramesOutput = 0;
mStarted = true;
return OK;
}
status_t VorbisDecoder::stop() {
CHECK(mStarted);
vorbis_dsp_clear(mState);
delete mState;
mState = NULL;
vorbis_info_clear(mVi);
delete mVi;
mVi = NULL;
delete mBufferGroup;
mBufferGroup = NULL;
mSource->stop();
mStarted = false;
return OK;
}
sp<MetaData> VorbisDecoder::getFormat() {
sp<MetaData> srcFormat = mSource->getFormat();
sp<MetaData> meta = new MetaData;
meta->setCString(kKeyMIMEType, MEDIA_MIMETYPE_AUDIO_RAW);
meta->setInt32(kKeyChannelCount, mNumChannels);
meta->setInt32(kKeySampleRate, mSampleRate);
int64_t durationUs;
if (srcFormat->findInt64(kKeyDuration, &durationUs)) {
meta->setInt64(kKeyDuration, durationUs);
}
meta->setCString(kKeyDecoderComponent, "VorbisDecoder");
return meta;
}
int VorbisDecoder::decodePacket(MediaBuffer *packet, MediaBuffer *out) {
ogg_buffer buf;
buf.data = (uint8_t *)packet->data() + packet->range_offset();
buf.size = packet->range_length();
buf.refcount = 1;
buf.ptr.owner = NULL;
ogg_reference ref;
ref.buffer = &buf;
ref.begin = 0;
ref.length = packet->range_length();
ref.next = NULL;
ogg_packet pack;
pack.packet = &ref;
pack.bytes = packet->range_length();
pack.b_o_s = 0;
pack.e_o_s = 0;
pack.granulepos = 0;
pack.packetno = 0;
int numFrames = 0;
int err = vorbis_dsp_synthesis(mState, &pack, 1);
if (err != 0) {
LOGW("vorbis_dsp_synthesis returned %d", err);
} else {
numFrames = vorbis_dsp_pcmout(
mState, (int16_t *)out->data(), kMaxNumSamplesPerBuffer);
if (numFrames < 0) {
LOGE("vorbis_dsp_pcmout returned %d", numFrames);
numFrames = 0;
}
}
out->set_range(0, numFrames * sizeof(int16_t) * mNumChannels);
return numFrames;
}
status_t VorbisDecoder::read(
MediaBuffer **out, const ReadOptions *options) {
status_t err;
*out = NULL;
int64_t seekTimeUs;
ReadOptions::SeekMode mode;
if (options && options->getSeekTo(&seekTimeUs, &mode)) {
CHECK(seekTimeUs >= 0);
mNumFramesOutput = 0;
vorbis_dsp_restart(mState);
} else {
seekTimeUs = -1;
}
MediaBuffer *inputBuffer;
err = mSource->read(&inputBuffer, options);
if (err != OK) {
return ERROR_END_OF_STREAM;
}
int64_t timeUs;
if (inputBuffer->meta_data()->findInt64(kKeyTime, &timeUs)) {
mAnchorTimeUs = timeUs;
mNumFramesOutput = 0;
} else {
// We must have a new timestamp after seeking.
CHECK(seekTimeUs < 0);
}
MediaBuffer *outputBuffer;
CHECK_EQ(mBufferGroup->acquire_buffer(&outputBuffer), OK);
int numFrames = decodePacket(inputBuffer, outputBuffer);
inputBuffer->release();
inputBuffer = NULL;
outputBuffer->meta_data()->setInt64(
kKeyTime,
mAnchorTimeUs
+ (mNumFramesOutput * 1000000ll) / mSampleRate);
mNumFramesOutput += numFrames;
*out = outputBuffer;
return OK;
}
} // namespace android
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