Alexandre Lision | 8538238 | 2014-01-27 15:54:16 -0500 | [diff] [blame] | 1 | /* Copyright (c) 2013 Jean-Marc Valin */ |
| 2 | /* |
| 3 | Redistribution and use in source and binary forms, with or without |
| 4 | modification, are permitted provided that the following conditions |
| 5 | are met: |
| 6 | |
| 7 | - Redistributions of source code must retain the above copyright |
| 8 | notice, this list of conditions and the following disclaimer. |
| 9 | |
| 10 | - Redistributions in binary form must reproduce the above copyright |
| 11 | notice, this list of conditions and the following disclaimer in the |
| 12 | documentation and/or other materials provided with the distribution. |
| 13 | |
| 14 | THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| 15 | ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| 16 | LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| 17 | A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER |
| 18 | OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
| 19 | EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
| 20 | PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR |
| 21 | PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF |
| 22 | LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING |
| 23 | NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS |
| 24 | SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 25 | */ |
| 26 | |
| 27 | /* This is meant to be a simple example of encoding and decoding audio |
| 28 | using Opus. It should make it easy to understand how the Opus API |
| 29 | works. For more information, see the full API documentation at: |
| 30 | http://www.opus-codec.org/docs/ */ |
| 31 | |
| 32 | #include <stdlib.h> |
| 33 | #include <errno.h> |
| 34 | #include <string.h> |
| 35 | #include <opus.h> |
| 36 | #include <stdio.h> |
| 37 | |
| 38 | /*The frame size is hardcoded for this sample code but it doesn't have to be*/ |
| 39 | #define FRAME_SIZE 960 |
| 40 | #define SAMPLE_RATE 48000 |
| 41 | #define CHANNELS 2 |
| 42 | #define APPLICATION OPUS_APPLICATION_AUDIO |
| 43 | #define BITRATE 64000 |
| 44 | |
| 45 | #define MAX_FRAME_SIZE 6*960 |
| 46 | #define MAX_PACKET_SIZE (3*1276) |
| 47 | |
| 48 | int main(int argc, char **argv) |
| 49 | { |
| 50 | char *inFile; |
| 51 | FILE *fin; |
| 52 | char *outFile; |
| 53 | FILE *fout; |
| 54 | opus_int16 in[FRAME_SIZE*CHANNELS]; |
| 55 | opus_int16 out[MAX_FRAME_SIZE*CHANNELS]; |
| 56 | unsigned char cbits[MAX_PACKET_SIZE]; |
| 57 | int nbBytes; |
| 58 | /*Holds the state of the encoder and decoder */ |
| 59 | OpusEncoder *encoder; |
| 60 | OpusDecoder *decoder; |
| 61 | int err; |
| 62 | |
| 63 | if (argc != 3) |
| 64 | { |
| 65 | fprintf(stderr, "usage: trivial_example input.pcm output.pcm\n"); |
| 66 | fprintf(stderr, "input and output are 16-bit little-endian raw files\n"); |
| 67 | return EXIT_FAILURE; |
| 68 | } |
| 69 | |
| 70 | /*Create a new encoder state */ |
| 71 | encoder = opus_encoder_create(SAMPLE_RATE, CHANNELS, APPLICATION, &err); |
| 72 | if (err<0) |
| 73 | { |
| 74 | fprintf(stderr, "failed to create an encoder: %s\n", opus_strerror(err)); |
| 75 | return EXIT_FAILURE; |
| 76 | } |
| 77 | /* Set the desired bit-rate. You can also set other parameters if needed. |
| 78 | The Opus library is designed to have good defaults, so only set |
| 79 | parameters you know you need. Doing otherwise is likely to result |
| 80 | in worse quality, but better. */ |
| 81 | err = opus_encoder_ctl(encoder, OPUS_SET_BITRATE(BITRATE)); |
| 82 | if (err<0) |
| 83 | { |
| 84 | fprintf(stderr, "failed to set bitrate: %s\n", opus_strerror(err)); |
| 85 | return EXIT_FAILURE; |
| 86 | } |
| 87 | inFile = argv[1]; |
| 88 | fin = fopen(inFile, "r"); |
| 89 | if (fin==NULL) |
| 90 | { |
| 91 | fprintf(stderr, "failed to open file: %s\n", strerror(errno)); |
| 92 | return EXIT_FAILURE; |
| 93 | } |
| 94 | |
| 95 | |
| 96 | /* Create a new decoder state. */ |
| 97 | decoder = opus_decoder_create(SAMPLE_RATE, CHANNELS, &err); |
| 98 | if (err<0) |
| 99 | { |
| 100 | fprintf(stderr, "failed to create decoder: %s\n", opus_strerror(err)); |
| 101 | return EXIT_FAILURE; |
| 102 | } |
| 103 | outFile = argv[2]; |
| 104 | fout = fopen(outFile, "w"); |
| 105 | if (fout==NULL) |
| 106 | { |
| 107 | fprintf(stderr, "failed to open file: %s\n", strerror(errno)); |
| 108 | return EXIT_FAILURE; |
| 109 | } |
| 110 | |
| 111 | while (1) |
| 112 | { |
| 113 | int i; |
| 114 | unsigned char pcm_bytes[MAX_FRAME_SIZE*CHANNELS*2]; |
| 115 | int frame_size; |
| 116 | |
| 117 | /* Read a 16 bits/sample audio frame. */ |
| 118 | fread(pcm_bytes, sizeof(short)*CHANNELS, FRAME_SIZE, fin); |
| 119 | if (feof(fin)) |
| 120 | break; |
| 121 | /* Convert from little-endian ordering. */ |
| 122 | for (i=0;i<CHANNELS*FRAME_SIZE;i++) |
| 123 | in[i]=pcm_bytes[2*i+1]<<8|pcm_bytes[2*i]; |
| 124 | |
| 125 | /* Encode the frame. */ |
| 126 | nbBytes = opus_encode(encoder, in, FRAME_SIZE, cbits, MAX_PACKET_SIZE); |
| 127 | if (nbBytes<0) |
| 128 | { |
| 129 | fprintf(stderr, "encode failed: %s\n", opus_strerror(nbBytes)); |
| 130 | return EXIT_FAILURE; |
| 131 | } |
| 132 | |
| 133 | |
| 134 | /* Decode the data. In this example, frame_size will be constant because |
| 135 | the encoder is using a constant frame size. However, that may not |
| 136 | be the case for all encoders, so the decoder must always check |
| 137 | the frame size returned. */ |
| 138 | frame_size = opus_decode(decoder, cbits, nbBytes, out, MAX_FRAME_SIZE, 0); |
| 139 | if (frame_size<0) |
| 140 | { |
| 141 | fprintf(stderr, "decoder failed: %s\n", opus_strerror(err)); |
| 142 | return EXIT_FAILURE; |
| 143 | } |
| 144 | |
| 145 | /* Convert to little-endian ordering. */ |
| 146 | for(i=0;i<CHANNELS*frame_size;i++) |
| 147 | { |
| 148 | pcm_bytes[2*i]=out[i]&0xFF; |
| 149 | pcm_bytes[2*i+1]=(out[i]>>8)&0xFF; |
| 150 | } |
| 151 | /* Write the decoded audio to file. */ |
| 152 | fwrite(pcm_bytes, sizeof(short), frame_size*CHANNELS, fout); |
| 153 | } |
| 154 | /*Destroy the encoder state*/ |
| 155 | opus_encoder_destroy(encoder); |
| 156 | opus_decoder_destroy(decoder); |
| 157 | fclose(fin); |
| 158 | fclose(fout); |
| 159 | return EXIT_SUCCESS; |
| 160 | } |