SoftG711.cpp revision 423766ca07beb7e3e9cd301385708ca13fcce3e1 
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            if (pcmParams->nPortIndex == 0) {
125                // input port
126                pcmParams->ePCMMode = mIsMLaw ? OMX_AUDIO_PCMModeMULaw
127                                              : OMX_AUDIO_PCMModeALaw;
128            } else {
129                // output port
130                pcmParams->ePCMMode = OMX_AUDIO_PCMModeLinear;
131            }
132            pcmParams->eChannelMapping[0] = OMX_AUDIO_ChannelLF;
133            pcmParams->eChannelMapping[1] = OMX_AUDIO_ChannelRF;
134
135            pcmParams->nChannels = mNumChannels;
136            pcmParams->nSamplingRate = 8000;
137
138            return OMX_ErrorNone;
139        }
140
141        default:
142            return SimpleSoftOMXComponent::internalGetParameter(index, params);
143    }
144}
145
146OMX_ERRORTYPE SoftG711::internalSetParameter(
147        OMX_INDEXTYPE index, const OMX_PTR params) {
148    switch (index) {
149        case OMX_IndexParamAudioPcm:
150        {
151            OMX_AUDIO_PARAM_PCMMODETYPE *pcmParams =
152                (OMX_AUDIO_PARAM_PCMMODETYPE *)params;
153
154            if (!isValidOMXParam(pcmParams)) {
155                return OMX_ErrorBadParameter;
156            }
157
158            if (pcmParams->nPortIndex != 0 && pcmParams->nPortIndex != 1) {
159                return OMX_ErrorUndefined;
160            }
161
162            if (pcmParams->nChannels < 1 || pcmParams->nChannels > 2) {
163                return OMX_ErrorUndefined;
164            }
165
166            if(pcmParams->nPortIndex == 0) {
167                mNumChannels = pcmParams->nChannels;
168            }
169
170            return OMX_ErrorNone;
171        }
172
173        case OMX_IndexParamStandardComponentRole:
174        {
175            const OMX_PARAM_COMPONENTROLETYPE *roleParams =
176                (const OMX_PARAM_COMPONENTROLETYPE *)params;
177
178            if (!isValidOMXParam(roleParams)) {
179                return OMX_ErrorBadParameter;
180            }
181
182            if (mIsMLaw) {
183                if (strncmp((const char *)roleParams->cRole,
184                            "audio_decoder.g711mlaw",
185                            OMX_MAX_STRINGNAME_SIZE - 1)) {
186                    return OMX_ErrorUndefined;
187                }
188            } else {
189                if (strncmp((const char *)roleParams->cRole,
190                            "audio_decoder.g711alaw",
191                            OMX_MAX_STRINGNAME_SIZE - 1)) {
192                    return OMX_ErrorUndefined;
193                }
194            }
195
196            return OMX_ErrorNone;
197        }
198
199        default:
200            return SimpleSoftOMXComponent::internalSetParameter(index, params);
201    }
202}
203
204void SoftG711::onQueueFilled(OMX_U32 /* portIndex */) {
205    if (mSignalledError) {
206        return;
207    }
208
209    List<BufferInfo *> &inQueue = getPortQueue(0);
210    List<BufferInfo *> &outQueue = getPortQueue(1);
211
212    while (!inQueue.empty() && !outQueue.empty()) {
213        BufferInfo *inInfo = *inQueue.begin();
214        OMX_BUFFERHEADERTYPE *inHeader = inInfo->mHeader;
215
216        BufferInfo *outInfo = *outQueue.begin();
217        OMX_BUFFERHEADERTYPE *outHeader = outInfo->mHeader;
218
219        if (inHeader->nFlags & OMX_BUFFERFLAG_EOS) {
220            inQueue.erase(inQueue.begin());
221            inInfo->mOwnedByUs = false;
222            notifyEmptyBufferDone(inHeader);
223
224            outHeader->nFilledLen = 0;
225            outHeader->nFlags = OMX_BUFFERFLAG_EOS;
226
227            outQueue.erase(outQueue.begin());
228            outInfo->mOwnedByUs = false;
229            notifyFillBufferDone(outHeader);
230            return;
231        }
232
233        if (inHeader->nFilledLen > kMaxNumSamplesPerFrame) {
234            ALOGE("input buffer too large (%d).", inHeader->nFilledLen);
235
236            notify(OMX_EventError, OMX_ErrorUndefined, 0, NULL);
237            mSignalledError = true;
238        }
239
240        const uint8_t *inputptr = inHeader->pBuffer + inHeader->nOffset;
241
242        if (mIsMLaw) {
243            DecodeMLaw(
244                    reinterpret_cast<int16_t *>(outHeader->pBuffer),
245                    inputptr, inHeader->nFilledLen);
246        } else {
247            DecodeALaw(
248                    reinterpret_cast<int16_t *>(outHeader->pBuffer),
249                    inputptr, inHeader->nFilledLen);
250        }
251
252        outHeader->nTimeStamp = inHeader->nTimeStamp;
253        outHeader->nOffset = 0;
254        outHeader->nFilledLen = inHeader->nFilledLen * sizeof(int16_t);
255        outHeader->nFlags = 0;
256
257        inInfo->mOwnedByUs = false;
258        inQueue.erase(inQueue.begin());
259        inInfo = NULL;
260        notifyEmptyBufferDone(inHeader);
261        inHeader = NULL;
262
263        outInfo->mOwnedByUs = false;
264        outQueue.erase(outQueue.begin());
265        outInfo = NULL;
266        notifyFillBufferDone(outHeader);
267        outHeader = NULL;
268    }
269}
270
271// static
272void SoftG711::DecodeALaw(
273        int16_t *out, const uint8_t *in, size_t inSize) {
274    while (inSize-- > 0) {
275        int32_t x = *in++;
276
277        int32_t ix = x ^ 0x55;
278        ix &= 0x7f;
279
280        int32_t iexp = ix >> 4;
281        int32_t mant = ix & 0x0f;
282
283        if (iexp > 0) {
284            mant += 16;
285        }
286
287        mant = (mant << 4) + 8;
288
289        if (iexp > 1) {
290            mant = mant << (iexp - 1);
291        }
292
293        *out++ = (x > 127) ? mant : -mant;
294    }
295}
296
297// static
298void SoftG711::DecodeMLaw(
299        int16_t *out, const uint8_t *in, size_t inSize) {
300    while (inSize-- > 0) {
301        int32_t x = *in++;
302
303        int32_t mantissa = ~x;
304        int32_t exponent = (mantissa >> 4) & 7;
305        int32_t segment = exponent + 1;
306        mantissa &= 0x0f;
307
308        int32_t step = 4 << segment;
309
310        int32_t abs = (0x80l << exponent) + step * mantissa + step / 2 - 4 * 33;
311
312        *out++ = (x < 0x80) ? -abs : abs;
313    }
314}
315
316}  // namespace android
317
318android::SoftOMXComponent *createSoftOMXComponent(
319        const char *name, const OMX_CALLBACKTYPE *callbacks,
320        OMX_PTR appData, OMX_COMPONENTTYPE **component) {
321    return new android::SoftG711(name, callbacks, appData, component);
322}
323
324