xref: /frameworks/av/media/libstagefright/codecs/g711/dec/SoftG711.cpp

/*
 * Copyright (C) 2011 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.
 */

//#define LOG_NDEBUG 0
#define LOG_TAG "SoftG711"
#include <utils/Log.h>

#include "SoftG711.h"

#include <media/stagefright/foundation/ADebug.h>
#include <media/stagefright/MediaDefs.h>

namespace android {

template<class T>
static void InitOMXParams(T *params) {
    params->nSize = sizeof(T);
    params->nVersion.s.nVersionMajor = 1;
    params->nVersion.s.nVersionMinor = 0;
    params->nVersion.s.nRevision = 0;
    params->nVersion.s.nStep = 0;
}

SoftG711::SoftG711(
        const char *name,
        const OMX_CALLBACKTYPE *callbacks,
        OMX_PTR appData,
        OMX_COMPONENTTYPE **component)
    : SimpleSoftOMXComponent(name, callbacks, appData, component),
      mIsMLaw(true),
      mNumChannels(1),
      mSignalledError(false) {
    if (!strcmp(name, "OMX.google.g711.alaw.decoder")) {
        mIsMLaw = false;
    } else {
        CHECK(!strcmp(name, "OMX.google.g711.mlaw.decoder"));
    }

    initPorts();
}

SoftG711::~SoftG711() {
}

void SoftG711::initPorts() {
    OMX_PARAM_PORTDEFINITIONTYPE def;
    InitOMXParams(&def);

    def.nPortIndex = 0;
    def.eDir = OMX_DirInput;
    def.nBufferCountMin = kNumBuffers;
    def.nBufferCountActual = def.nBufferCountMin;
    def.nBufferSize = 8192;
    def.bEnabled = OMX_TRUE;
    def.bPopulated = OMX_FALSE;
    def.eDomain = OMX_PortDomainAudio;
    def.bBuffersContiguous = OMX_FALSE;
    def.nBufferAlignment = 1;

    def.format.audio.cMIMEType =
        const_cast<char *>(
                mIsMLaw
                    ? MEDIA_MIMETYPE_AUDIO_G711_MLAW
                    : MEDIA_MIMETYPE_AUDIO_G711_ALAW);

    def.format.audio.pNativeRender = NULL;
    def.format.audio.bFlagErrorConcealment = OMX_FALSE;
    def.format.audio.eEncoding = OMX_AUDIO_CodingG711;

    addPort(def);

    def.nPortIndex = 1;
    def.eDir = OMX_DirOutput;
    def.nBufferCountMin = kNumBuffers;
    def.nBufferCountActual = def.nBufferCountMin;
    def.nBufferSize = kMaxNumSamplesPerFrame * sizeof(int16_t);
    def.bEnabled = OMX_TRUE;
    def.bPopulated = OMX_FALSE;
    def.eDomain = OMX_PortDomainAudio;
    def.bBuffersContiguous = OMX_FALSE;
    def.nBufferAlignment = 2;

    def.format.audio.cMIMEType = const_cast<char *>("audio/raw");
    def.format.audio.pNativeRender = NULL;
    def.format.audio.bFlagErrorConcealment = OMX_FALSE;
    def.format.audio.eEncoding = OMX_AUDIO_CodingPCM;

    addPort(def);
}

OMX_ERRORTYPE SoftG711::internalGetParameter(
        OMX_INDEXTYPE index, OMX_PTR params) {
    switch (index) {
        case OMX_IndexParamAudioPcm:
        {
            OMX_AUDIO_PARAM_PCMMODETYPE *pcmParams =
                (OMX_AUDIO_PARAM_PCMMODETYPE *)params;

            if (pcmParams->nPortIndex > 1) {
                return OMX_ErrorUndefined;
            }

            pcmParams->eNumData = OMX_NumericalDataSigned;
            pcmParams->eEndian = OMX_EndianBig;
            pcmParams->bInterleaved = OMX_TRUE;
            pcmParams->nBitPerSample = 16;
            if (pcmParams->nPortIndex == 0) {
                // input port
                pcmParams->ePCMMode = mIsMLaw ? OMX_AUDIO_PCMModeMULaw
                                              : OMX_AUDIO_PCMModeALaw;
            } else {
                // output port
                pcmParams->ePCMMode = OMX_AUDIO_PCMModeLinear;
            }
            pcmParams->eChannelMapping[0] = OMX_AUDIO_ChannelLF;
            pcmParams->eChannelMapping[1] = OMX_AUDIO_ChannelRF;

            pcmParams->nChannels = mNumChannels;
            pcmParams->nSamplingRate = 8000;

            return OMX_ErrorNone;
        }

        default:
            return SimpleSoftOMXComponent::internalGetParameter(index, params);
    }
}

OMX_ERRORTYPE SoftG711::internalSetParameter(
        OMX_INDEXTYPE index, const OMX_PTR params) {
    switch (index) {
        case OMX_IndexParamAudioPcm:
        {
            OMX_AUDIO_PARAM_PCMMODETYPE *pcmParams =
                (OMX_AUDIO_PARAM_PCMMODETYPE *)params;

            if (pcmParams->nPortIndex != 0 && pcmParams->nPortIndex != 1) {
                return OMX_ErrorUndefined;
            }

            if (pcmParams->nChannels < 1 || pcmParams->nChannels > 2) {
                return OMX_ErrorUndefined;
            }

            if(pcmParams->nPortIndex == 0) {
                mNumChannels = pcmParams->nChannels;
            }

            return OMX_ErrorNone;
        }

        case OMX_IndexParamStandardComponentRole:
        {
            const OMX_PARAM_COMPONENTROLETYPE *roleParams =
                (const OMX_PARAM_COMPONENTROLETYPE *)params;

            if (mIsMLaw) {
                if (strncmp((const char *)roleParams->cRole,
                            "audio_decoder.g711mlaw",
                            OMX_MAX_STRINGNAME_SIZE - 1)) {
                    return OMX_ErrorUndefined;
                }
            } else {
                if (strncmp((const char *)roleParams->cRole,
                            "audio_decoder.g711alaw",
                            OMX_MAX_STRINGNAME_SIZE - 1)) {
                    return OMX_ErrorUndefined;
                }
            }

            return OMX_ErrorNone;
        }

        default:
            return SimpleSoftOMXComponent::internalSetParameter(index, params);
    }
}

void SoftG711::onQueueFilled(OMX_U32 /* portIndex */) {
    if (mSignalledError) {
        return;
    }

    List<BufferInfo *> &inQueue = getPortQueue(0);
    List<BufferInfo *> &outQueue = getPortQueue(1);

    while (!inQueue.empty() && !outQueue.empty()) {
        BufferInfo *inInfo = *inQueue.begin();
        OMX_BUFFERHEADERTYPE *inHeader = inInfo->mHeader;

        BufferInfo *outInfo = *outQueue.begin();
        OMX_BUFFERHEADERTYPE *outHeader = outInfo->mHeader;

        if (inHeader->nFlags & OMX_BUFFERFLAG_EOS) {
            inQueue.erase(inQueue.begin());
            inInfo->mOwnedByUs = false;
            notifyEmptyBufferDone(inHeader);

            outHeader->nFilledLen = 0;
            outHeader->nFlags = OMX_BUFFERFLAG_EOS;

            outQueue.erase(outQueue.begin());
            outInfo->mOwnedByUs = false;
            notifyFillBufferDone(outHeader);
            return;
        }

        if (inHeader->nFilledLen > kMaxNumSamplesPerFrame) {
            ALOGE("input buffer too large (%d).", inHeader->nFilledLen);

            notify(OMX_EventError, OMX_ErrorUndefined, 0, NULL);
            mSignalledError = true;
        }

        const uint8_t *inputptr = inHeader->pBuffer + inHeader->nOffset;

        if (mIsMLaw) {
            DecodeMLaw(
                    reinterpret_cast<int16_t *>(outHeader->pBuffer),
                    inputptr, inHeader->nFilledLen);
        } else {
            DecodeALaw(
                    reinterpret_cast<int16_t *>(outHeader->pBuffer),
                    inputptr, inHeader->nFilledLen);
        }

        outHeader->nTimeStamp = inHeader->nTimeStamp;
        outHeader->nOffset = 0;
        outHeader->nFilledLen = inHeader->nFilledLen * sizeof(int16_t);
        outHeader->nFlags = 0;

        inInfo->mOwnedByUs = false;
        inQueue.erase(inQueue.begin());
        inInfo = NULL;
        notifyEmptyBufferDone(inHeader);
        inHeader = NULL;

        outInfo->mOwnedByUs = false;
        outQueue.erase(outQueue.begin());
        outInfo = NULL;
        notifyFillBufferDone(outHeader);
        outHeader = NULL;
    }
}

// static
void SoftG711::DecodeALaw(
        int16_t *out, const uint8_t *in, size_t inSize) {
    while (inSize-- > 0) {
        int32_t x = *in++;

        int32_t ix = x ^ 0x55;
        ix &= 0x7f;

        int32_t iexp = ix >> 4;
        int32_t mant = ix & 0x0f;

        if (iexp > 0) {
            mant += 16;
        }

        mant = (mant << 4) + 8;

        if (iexp > 1) {
            mant = mant << (iexp - 1);
        }

        *out++ = (x > 127) ? mant : -mant;
    }
}

// static
void SoftG711::DecodeMLaw(
        int16_t *out, const uint8_t *in, size_t inSize) {
    while (inSize-- > 0) {
        int32_t x = *in++;

        int32_t mantissa = ~x;
        int32_t exponent = (mantissa >> 4) & 7;
        int32_t segment = exponent + 1;
        mantissa &= 0x0f;

        int32_t step = 4 << segment;

        int32_t abs = (0x80l << exponent) + step * mantissa + step / 2 - 4 * 33;

        *out++ = (x < 0x80) ? -abs : abs;
    }
}

}  // namespace android

android::SoftOMXComponent *createSoftOMXComponent(
        const char *name, const OMX_CALLBACKTYPE *callbacks,
        OMX_PTR appData, OMX_COMPONENTTYPE **component) {
    return new android::SoftG711(name, callbacks, appData, component);
}