SoftG711.cpp revision 0490fe25b580546f54d4d5bdb184fa8df091dfc5 
1/*
2 * Copyright (C) 2011 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17//#define LOG_NDEBUG 0
18#define LOG_TAG "SoftG711"
19#include <utils/Log.h>
20
21#include "SoftG711.h"
22
23#include <media/stagefright/foundation/ADebug.h>
24#include <media/stagefright/MediaDefs.h>
25
26namespace android {
27
28template<class T>
29static void InitOMXParams(T *params) {
30    params->nSize = sizeof(T);
31    params->nVersion.s.nVersionMajor = 1;
32    params->nVersion.s.nVersionMinor = 0;
33    params->nVersion.s.nRevision = 0;
34    params->nVersion.s.nStep = 0;
35}
36
37SoftG711::SoftG711(
38        const char *name,
39        const OMX_CALLBACKTYPE *callbacks,
40        OMX_PTR appData,
41        OMX_COMPONENTTYPE **component)
42    : SimpleSoftOMXComponent(name, callbacks, appData, component),
43      mIsMLaw(true),
44      mNumChannels(1),
45      mSignalledError(false) {
46    if (!strcmp(name, "OMX.google.g711.alaw.decoder")) {
47        mIsMLaw = false;
48    } else {
49        CHECK(!strcmp(name, "OMX.google.g711.mlaw.decoder"));
50    }
51
52    initPorts();
53}
54
55SoftG711::~SoftG711() {
56}
57
58void SoftG711::initPorts() {
59    OMX_PARAM_PORTDEFINITIONTYPE def;
60    InitOMXParams(&def);
61
62    def.nPortIndex = 0;
63    def.eDir = OMX_DirInput;
64    def.nBufferCountMin = kNumBuffers;
65    def.nBufferCountActual = def.nBufferCountMin;
66    def.nBufferSize = 8192;
67    def.bEnabled = OMX_TRUE;
68    def.bPopulated = OMX_FALSE;
69    def.eDomain = OMX_PortDomainAudio;
70    def.bBuffersContiguous = OMX_FALSE;
71    def.nBufferAlignment = 1;
72
73    def.format.audio.cMIMEType =
74        const_cast<char *>(
75                mIsMLaw
76                    ? MEDIA_MIMETYPE_AUDIO_G711_MLAW
77                    : MEDIA_MIMETYPE_AUDIO_G711_ALAW);
78
79    def.format.audio.pNativeRender = NULL;
80    def.format.audio.bFlagErrorConcealment = OMX_FALSE;
81    def.format.audio.eEncoding = OMX_AUDIO_CodingG711;
82
83    addPort(def);
84
85    def.nPortIndex = 1;
86    def.eDir = OMX_DirOutput;
87    def.nBufferCountMin = kNumBuffers;
88    def.nBufferCountActual = def.nBufferCountMin;
89    def.nBufferSize = kMaxNumSamplesPerFrame * sizeof(int16_t);
90    def.bEnabled = OMX_TRUE;
91    def.bPopulated = OMX_FALSE;
92    def.eDomain = OMX_PortDomainAudio;
93    def.bBuffersContiguous = OMX_FALSE;
94    def.nBufferAlignment = 2;
95
96    def.format.audio.cMIMEType = const_cast<char *>("audio/raw");
97    def.format.audio.pNativeRender = NULL;
98    def.format.audio.bFlagErrorConcealment = OMX_FALSE;
99    def.format.audio.eEncoding = OMX_AUDIO_CodingPCM;
100
101    addPort(def);
102}
103
104OMX_ERRORTYPE SoftG711::internalGetParameter(
105        OMX_INDEXTYPE index, OMX_PTR params) {
106    switch (index) {
107        case OMX_IndexParamAudioPcm:
108        {
109            OMX_AUDIO_PARAM_PCMMODETYPE *pcmParams =
110                (OMX_AUDIO_PARAM_PCMMODETYPE *)params;
111
112            if (!isValidOMXParam(pcmParams)) {
113                return OMX_ErrorBadParameter;
114            }
115
116            if (pcmParams->nPortIndex > 1) {
117                return OMX_ErrorUndefined;
118            }
119
120            pcmParams->eNumData = OMX_NumericalDataSigned;
121            pcmParams->eEndian = OMX_EndianBig;
122            pcmParams->bInterleaved = OMX_TRUE;
123            pcmParams->nBitPerSample = 16;
124            pcmParams->ePCMMode = OMX_AUDIO_PCMModeLinear;
125            pcmParams->eChannelMapping[0] = OMX_AUDIO_ChannelLF;
126            pcmParams->eChannelMapping[1] = OMX_AUDIO_ChannelRF;
127
128            pcmParams->nChannels = mNumChannels;
129            pcmParams->nSamplingRate = 8000;
130
131            return OMX_ErrorNone;
132        }
133
134        default:
135            return SimpleSoftOMXComponent::internalGetParameter(index, params);
136    }
137}
138
139OMX_ERRORTYPE SoftG711::internalSetParameter(
140        OMX_INDEXTYPE index, const OMX_PTR params) {
141    switch (index) {
142        case OMX_IndexParamAudioPcm:
143        {
144            OMX_AUDIO_PARAM_PCMMODETYPE *pcmParams =
145                (OMX_AUDIO_PARAM_PCMMODETYPE *)params;
146
147            if (!isValidOMXParam(pcmParams)) {
148                return OMX_ErrorBadParameter;
149            }
150
151            if (pcmParams->nPortIndex != 0 && pcmParams->nPortIndex != 1) {
152                return OMX_ErrorUndefined;
153            }
154
155            if (pcmParams->nChannels < 1 || pcmParams->nChannels > 2) {
156                return OMX_ErrorUndefined;
157            }
158
159            if(pcmParams->nPortIndex == 0) {
160                mNumChannels = pcmParams->nChannels;
161            }
162
163            return OMX_ErrorNone;
164        }
165
166        case OMX_IndexParamStandardComponentRole:
167        {
168            const OMX_PARAM_COMPONENTROLETYPE *roleParams =
169                (const OMX_PARAM_COMPONENTROLETYPE *)params;
170
171            if (!isValidOMXParam(roleParams)) {
172                return OMX_ErrorBadParameter;
173            }
174
175            if (mIsMLaw) {
176                if (strncmp((const char *)roleParams->cRole,
177                            "audio_decoder.g711mlaw",
178                            OMX_MAX_STRINGNAME_SIZE - 1)) {
179                    return OMX_ErrorUndefined;
180                }
181            } else {
182                if (strncmp((const char *)roleParams->cRole,
183                            "audio_decoder.g711alaw",
184                            OMX_MAX_STRINGNAME_SIZE - 1)) {
185                    return OMX_ErrorUndefined;
186                }
187            }
188
189            return OMX_ErrorNone;
190        }
191
192        default:
193            return SimpleSoftOMXComponent::internalSetParameter(index, params);
194    }
195}
196
197void SoftG711::onQueueFilled(OMX_U32 portIndex) {
198    if (mSignalledError) {
199        return;
200    }
201
202    List<BufferInfo *> &inQueue = getPortQueue(0);
203    List<BufferInfo *> &outQueue = getPortQueue(1);
204
205    while (!inQueue.empty() && !outQueue.empty()) {
206        BufferInfo *inInfo = *inQueue.begin();
207        OMX_BUFFERHEADERTYPE *inHeader = inInfo->mHeader;
208
209        BufferInfo *outInfo = *outQueue.begin();
210        OMX_BUFFERHEADERTYPE *outHeader = outInfo->mHeader;
211
212        if (inHeader->nFlags & OMX_BUFFERFLAG_EOS) {
213            inQueue.erase(inQueue.begin());
214            inInfo->mOwnedByUs = false;
215            notifyEmptyBufferDone(inHeader);
216
217            outHeader->nFilledLen = 0;
218            outHeader->nFlags = OMX_BUFFERFLAG_EOS;
219
220            outQueue.erase(outQueue.begin());
221            outInfo->mOwnedByUs = false;
222            notifyFillBufferDone(outHeader);
223            return;
224        }
225
226        if (inHeader->nFilledLen > kMaxNumSamplesPerFrame) {
227            ALOGE("input buffer too large (%ld).", inHeader->nFilledLen);
228
229            notify(OMX_EventError, OMX_ErrorUndefined, 0, NULL);
230            mSignalledError = true;
231        }
232
233        if (inHeader->nFilledLen * sizeof(int16_t) > outHeader->nAllocLen) {
234            ALOGE("output buffer too small (%d).", outHeader->nAllocLen);
235            android_errorWriteLog(0x534e4554, "27793163");
236
237            notify(OMX_EventError, OMX_ErrorUndefined, 0, NULL);
238            mSignalledError = true;
239            return;
240        }
241
242        const uint8_t *inputptr = inHeader->pBuffer + inHeader->nOffset;
243
244        if (mIsMLaw) {
245            DecodeMLaw(
246                    reinterpret_cast<int16_t *>(outHeader->pBuffer),
247                    inputptr, inHeader->nFilledLen);
248        } else {
249            DecodeALaw(
250                    reinterpret_cast<int16_t *>(outHeader->pBuffer),
251                    inputptr, inHeader->nFilledLen);
252        }
253
254        outHeader->nTimeStamp = inHeader->nTimeStamp;
255        outHeader->nOffset = 0;
256        outHeader->nFilledLen = inHeader->nFilledLen * sizeof(int16_t);
257        outHeader->nFlags = 0;
258
259        inInfo->mOwnedByUs = false;
260        inQueue.erase(inQueue.begin());
261        inInfo = NULL;
262        notifyEmptyBufferDone(inHeader);
263        inHeader = NULL;
264
265        outInfo->mOwnedByUs = false;
266        outQueue.erase(outQueue.begin());
267        outInfo = NULL;
268        notifyFillBufferDone(outHeader);
269        outHeader = NULL;
270    }
271}
272
273// static
274void SoftG711::DecodeALaw(
275        int16_t *out, const uint8_t *in, size_t inSize) {
276    while (inSize-- > 0) {
277        int32_t x = *in++;
278
279        int32_t ix = x ^ 0x55;
280        ix &= 0x7f;
281
282        int32_t iexp = ix >> 4;
283        int32_t mant = ix & 0x0f;
284
285        if (iexp > 0) {
286            mant += 16;
287        }
288
289        mant = (mant << 4) + 8;
290
291        if (iexp > 1) {
292            mant = mant << (iexp - 1);
293        }
294
295        *out++ = (x > 127) ? mant : -mant;
296    }
297}
298
299// static
300void SoftG711::DecodeMLaw(
301        int16_t *out, const uint8_t *in, size_t inSize) {
302    while (inSize-- > 0) {
303        int32_t x = *in++;
304
305        int32_t mantissa = ~x;
306        int32_t exponent = (mantissa >> 4) & 7;
307        int32_t segment = exponent + 1;
308        mantissa &= 0x0f;
309
310        int32_t step = 4 << segment;
311
312        int32_t abs = (0x80l << exponent) + step * mantissa + step / 2 - 4 * 33;
313
314        *out++ = (x < 0x80) ? -abs : abs;
315    }
316}
317
318}  // namespace android
319
320android::SoftOMXComponent *createSoftOMXComponent(
321        const char *name, const OMX_CALLBACKTYPE *callbacks,
322        OMX_PTR appData, OMX_COMPONENTTYPE **component) {
323    return new android::SoftG711(name, callbacks, appData, component);
324}
325
326