* Feed opus audio data for decoding. Calling program should enqueue and decode * immedately after enqueuing to reduce decoding latency and reduce size of * undecoded decoder->buffer data. Per https://xiph.org/ogg/doc/oggstream.html, * decoding would be possible by 64k. Otherwise, you're feeding invalid Opus * data that is not recognized as a valid, decodable Ogg Opus File * * The undecoded
| 44 | * Returns 1 or 0 for success or error |
| 45 | */ |
| 46 | int opus_chunkdecoder_enqueue(OpusChunkDecoder *decoder, unsigned char *data, size_t size) { |
| 47 | ssize_t bufferMax = sizeof(decoder->buffer._data), |
| 48 | bufferUsed = decoder->buffer.num_unread; |
| 49 | |
| 50 | // fprintf(stdout, "Undecoded: %zd\n", bufferUsed); |
| 51 | |
| 52 | if (bufferUsed + size > bufferMax) { |
| 53 | fprintf(stderr, "ERROR: Cannot enqueue %zd bytes, overflows by %zd. Used: "\ |
| 54 | "%zd/%zd, OggOpusFile discovered: %s. " \ |
| 55 | "Try reducing chunk or decode before enqueuing more\n", |
| 56 | size, |
| 57 | size + bufferUsed - bufferMax, |
| 58 | bufferUsed, |
| 59 | bufferMax, |
| 60 | (!decoder->of)? "false" : "true" |
| 61 | ); |
| 62 | return 0; |
| 63 | } |
| 64 | |
| 65 | decoder->buffer.cursor = decoder->buffer.start; |
| 66 | |
| 67 | /* |
| 68 | initialize OggOpusFile if not yet initialized. A few attempts are needed |
| 69 | until enough bytes are collected for it to discover first Ogg page |
| 70 | */ |
| 71 | if (!decoder->of) { |
| 72 | memcpy( decoder->buffer.cursor + decoder->buffer.num_unread, data, size ); |
| 73 | decoder->buffer.num_unread += size; |
| 74 | |
| 75 | int err; |
| 76 | |
| 77 | decoder->of = op_open_callbacks( |
| 78 | decoder, |
| 79 | &decoder->cb, |
| 80 | decoder->buffer.cursor, |
| 81 | decoder->buffer.num_unread, |
| 82 | &err |
| 83 | ); |
| 84 | |
| 85 | if (err == 0) { |
| 86 | fprintf(stderr, "OggOpusFile discovered with %d bytes\n", decoder->buffer.num_unread); |
| 87 | |
| 88 | // OggOpusFile instantiated. Reset unread buffer count |
| 89 | decoder->buffer.num_unread = 0; |
| 90 | } |
| 91 | } else { |
| 92 | // set buffer to new data |
| 93 | decoder->buffer.num_unread += size; |
| 94 | memcpy( decoder->buffer.cursor, data, size ); |
| 95 | } |
| 96 | |
| 97 | return 1; |
| 98 | } |
| 99 | |
| 100 | // returns total samples decoded |
| 101 | int opus_chunkdecoder_decode_float_stereo(OpusChunkDecoder *decoder, float *pcm_out, int pcm_out_size) { |