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使用mingw的Msys工具，我已經成功地從source 1.1.tar.gz構建opus-codec。該版本生成了一些文件，其中有libopus.a和libopus-0.dll。現在我想嘗試QtCreator中的trivial-example.c。我將lib添加到我的.pro文件中，並在我的主文件中包含opus.h。編譯器抱怨它找不到包含在opus.h中的頭文件不應該包含在lib中嗎？我如何設置我的應用程序來運行「小例子」？在QtCreator中鏈接/使用外部庫
我的文件夾結構是：
- main.cpp中
- opus_lib_test.pro
- opus_lib_test.pro.user
- 包括[文件夾]
- opus.h（從源包括文件夾）
- 個庫[文件夾]
- libopus.a
- libopus-0.dll
我.pro -file看起來像
QT += core
QT -= gui
TARGET = opus_lib_test
CONFIG += console
CONFIG -= app_bundle
TEMPLATE = app
INCLUDEPATH += $$PWD/include
LIBS += -L"C:/Qt/Qt5.2.1/Tools/QtCreator/bin/opus_lib_test/libs/" -llibopus
SOURCES += main.cpp
HEADERS += include/opus.h
和我main.cpp是在這裏：
//#include <QCoreApplication>
#include "opus.h"
int main(int argc, char *argv[])
{
// QCoreApplication a(argc, argv);
// return a.exec();
// ----------------------------- trivial_example.c
char *inFile;
FILE *fin;
char *outFile;
FILE *fout;
opus_int16 in[FRAME_SIZE*CHANNELS];
opus_int16 out[MAX_FRAME_SIZE*CHANNELS];
unsigned char cbits[MAX_PACKET_SIZE];
int nbBytes;
/*Holds the state of the encoder and decoder */
OpusEncoder *encoder;
OpusDecoder *decoder;
int err;
if (argc != 3)
{
fprintf(stderr, "usage: trivial_example input.pcm output.pcm\n");
fprintf(stderr, "input and output are 16-bit little-endian raw files\n");
return EXIT_FAILURE;
}
/*Create a new encoder state */
encoder = opus_encoder_create(SAMPLE_RATE, CHANNELS, APPLICATION, &err);
if (err<0)
{
fprintf(stderr, "failed to create an encoder: %s\n", opus_strerror(err));
return EXIT_FAILURE;
}
/* Set the desired bit-rate. You can also set other parameters if needed.
The Opus library is designed to have good defaults, so only set
parameters you know you need. Doing otherwise is likely to result
in worse quality, but better. */
err = opus_encoder_ctl(encoder, OPUS_SET_BITRATE(BITRATE));
if (err<0)
{
fprintf(stderr, "failed to set bitrate: %s\n", opus_strerror(err));
return EXIT_FAILURE;
}
inFile = argv[1];
fin = fopen(inFile, "r");
if (fin==NULL)
{
fprintf(stderr, "failed to open file: %s\n", strerror(errno));
return EXIT_FAILURE;
}
/* Create a new decoder state. */
decoder = opus_decoder_create(SAMPLE_RATE, CHANNELS, &err);
if (err<0)
{
fprintf(stderr, "failed to create decoder: %s\n", opus_strerror(err));
return EXIT_FAILURE;
}
outFile = argv[2];
fout = fopen(outFile, "w");
if (fout==NULL)
{
fprintf(stderr, "failed to open file: %s\n", strerror(errno));
return EXIT_FAILURE;
}
while (1)
{
int i;
unsigned char pcm_bytes[MAX_FRAME_SIZE*CHANNELS*2];
int frame_size;
/* Read a 16 bits/sample audio frame. */
fread(pcm_bytes, sizeof(short)*CHANNELS, FRAME_SIZE, fin);
if (feof(fin))
break;
/* Convert from little-endian ordering. */
for (i=0;i<CHANNELS*FRAME_SIZE;i++)
in[i]=pcm_bytes[2*i+1]<<8|pcm_bytes[2*i];
/* Encode the frame. */
nbBytes = opus_encode(encoder, in, FRAME_SIZE, cbits, MAX_PACKET_SIZE);
if (nbBytes<0)
{
fprintf(stderr, "encode failed: %s\n", opus_strerror(nbBytes));
return EXIT_FAILURE;
}
/* Decode the data. In this example, frame_size will be constant because
the encoder is using a constant frame size. However, that may not
be the case for all encoders, so the decoder must always check
the frame size returned. */
frame_size = opus_decode(decoder, cbits, nbBytes, out, MAX_FRAME_SIZE, 0);
if (frame_size<0)
{
fprintf(stderr, "decoder failed: %s\n", opus_strerror(err));
return EXIT_FAILURE;
}
/* Convert to little-endian ordering. */
for(i=0;i<CHANNELS*frame_size;i++)
{
pcm_bytes[2*i]=out[i]&0xFF;
pcm_bytes[2*i+1]=(out[i]>>8)&0xFF;
}
/* Write the decoded audio to file. */
fwrite(pcm_bytes, sizeof(short), frame_size*CHANNELS, fout);
}
/*Destroy the encoder state*/
opus_encoder_destroy(encoder);
opus_decoder_destroy(decoder);
fclose(fin);
fclose(fout);
return EXIT_SUCCESS;
}