12bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian/* Copyright (c) 2013 Jean-Marc Valin */ 22bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian/* 32bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian Redistribution and use in source and binary forms, with or without 42bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian modification, are permitted provided that the following conditions 52bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian are met: 62bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian 72bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian - Redistributions of source code must retain the above copyright 82bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian notice, this list of conditions and the following disclaimer. 92bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian 102bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian - Redistributions in binary form must reproduce the above copyright 112bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian notice, this list of conditions and the following disclaimer in the 122bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian documentation and/or other materials provided with the distribution. 132bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian 142bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 152bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 162bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 172bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER 182bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 192bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 202bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 212bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF 222bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING 232bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 242bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 252bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian*/ 262bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian 272bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian/* This is meant to be a simple example of encoding and decoding audio 282bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian using Opus. It should make it easy to understand how the Opus API 292bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian works. For more information, see the full API documentation at: 302bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian http://www.opus-codec.org/docs/ */ 312bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian 322bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian#include <stdlib.h> 332bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian#include <errno.h> 342bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian#include <string.h> 352bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian#include <opus.h> 362bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian#include <stdio.h> 372bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian 382bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian/*The frame size is hardcoded for this sample code but it doesn't have to be*/ 392bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian#define FRAME_SIZE 960 402bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian#define SAMPLE_RATE 48000 412bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian#define CHANNELS 2 422bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian#define APPLICATION OPUS_APPLICATION_AUDIO 432bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian#define BITRATE 64000 442bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian 452bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian#define MAX_FRAME_SIZE 6*960 462bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian#define MAX_PACKET_SIZE (3*1276) 472bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian 482bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanianint main(int argc, char **argv) 492bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian{ 502bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian char *inFile; 512bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian FILE *fin; 522bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian char *outFile; 532bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian FILE *fout; 542bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian opus_int16 in[FRAME_SIZE*CHANNELS]; 552bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian opus_int16 out[MAX_FRAME_SIZE*CHANNELS]; 562bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian unsigned char cbits[MAX_PACKET_SIZE]; 572bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian int nbBytes; 582bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian /*Holds the state of the encoder and decoder */ 592bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian OpusEncoder *encoder; 602bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian OpusDecoder *decoder; 612bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian int err; 622bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian 632bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian if (argc != 3) 642bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian { 652bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian fprintf(stderr, "usage: trivial_example input.pcm output.pcm\n"); 662bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian fprintf(stderr, "input and output are 16-bit little-endian raw files\n"); 672bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian return EXIT_FAILURE; 682bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian } 692bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian 702bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian /*Create a new encoder state */ 712bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian encoder = opus_encoder_create(SAMPLE_RATE, CHANNELS, APPLICATION, &err); 722bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian if (err<0) 732bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian { 742bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian fprintf(stderr, "failed to create an encoder: %s\n", opus_strerror(err)); 752bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian return EXIT_FAILURE; 762bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian } 772bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian /* Set the desired bit-rate. You can also set other parameters if needed. 782bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian The Opus library is designed to have good defaults, so only set 792bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian parameters you know you need. Doing otherwise is likely to result 802bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian in worse quality, but better. */ 812bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian err = opus_encoder_ctl(encoder, OPUS_SET_BITRATE(BITRATE)); 822bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian if (err<0) 832bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian { 842bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian fprintf(stderr, "failed to set bitrate: %s\n", opus_strerror(err)); 852bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian return EXIT_FAILURE; 862bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian } 872bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian inFile = argv[1]; 882bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian fin = fopen(inFile, "r"); 892bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian if (fin==NULL) 902bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian { 912bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian fprintf(stderr, "failed to open file: %s\n", strerror(errno)); 922bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian return EXIT_FAILURE; 932bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian } 942bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian 952bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian 962bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian /* Create a new decoder state. */ 972bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian decoder = opus_decoder_create(SAMPLE_RATE, CHANNELS, &err); 982bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian if (err<0) 992bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian { 1002bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian fprintf(stderr, "failed to create decoder: %s\n", opus_strerror(err)); 1012bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian return EXIT_FAILURE; 1022bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian } 1032bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian outFile = argv[2]; 1042bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian fout = fopen(outFile, "w"); 1052bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian if (fout==NULL) 1062bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian { 1072bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian fprintf(stderr, "failed to open file: %s\n", strerror(errno)); 1082bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian return EXIT_FAILURE; 1092bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian } 1102bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian 1112bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian while (1) 1122bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian { 1132bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian int i; 1142bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian unsigned char pcm_bytes[MAX_FRAME_SIZE*CHANNELS*2]; 1152bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian int frame_size; 1162bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian 1172bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian /* Read a 16 bits/sample audio frame. */ 1182bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian fread(pcm_bytes, sizeof(short)*CHANNELS, FRAME_SIZE, fin); 1192bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian if (feof(fin)) 1202bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian break; 1212bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian /* Convert from little-endian ordering. */ 1222bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian for (i=0;i<CHANNELS*FRAME_SIZE;i++) 1232bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian in[i]=pcm_bytes[2*i+1]<<8|pcm_bytes[2*i]; 1242bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian 1252bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian /* Encode the frame. */ 1262bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian nbBytes = opus_encode(encoder, in, FRAME_SIZE, cbits, MAX_PACKET_SIZE); 1272bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian if (nbBytes<0) 1282bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian { 1292bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian fprintf(stderr, "encode failed: %s\n", opus_strerror(nbBytes)); 1302bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian return EXIT_FAILURE; 1312bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian } 1322bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian 1332bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian 1342bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian /* Decode the data. In this example, frame_size will be constant because 1352bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian the encoder is using a constant frame size. However, that may not 1362bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian be the case for all encoders, so the decoder must always check 1372bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian the frame size returned. */ 1382bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian frame_size = opus_decode(decoder, cbits, nbBytes, out, MAX_FRAME_SIZE, 0); 1392bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian if (frame_size<0) 1402bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian { 1412bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian fprintf(stderr, "decoder failed: %s\n", opus_strerror(err)); 1422bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian return EXIT_FAILURE; 1432bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian } 1442bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian 1452bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian /* Convert to little-endian ordering. */ 1462bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian for(i=0;i<CHANNELS*frame_size;i++) 1472bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian { 1482bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian pcm_bytes[2*i]=out[i]&0xFF; 1492bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian pcm_bytes[2*i+1]=(out[i]>>8)&0xFF; 1502bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian } 1512bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian /* Write the decoded audio to file. */ 1522bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian fwrite(pcm_bytes, sizeof(short), frame_size*CHANNELS, fout); 1532bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian } 1542bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian /*Destroy the encoder state*/ 1552bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian opus_encoder_destroy(encoder); 1562bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian opus_decoder_destroy(decoder); 1572bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian fclose(fin); 1582bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian fclose(fout); 1592bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian return EXIT_SUCCESS; 1602bd8b54017b5320bc0c1df9bf86f4cdc9f8db242Vignesh Venkatasubramanian} 161