A single-file C library for creating Apple Lossless Audio Codec (ALAC) streams. Does not use any C library functions, does not allocate any heap memory.
The streams are not compressed, hence the name "technically" ALAC.
In one C file define TECHNICALLYALAC_IMPLEMENTATION before including technicallyalac.h.
See technicallyalac.h for details on how to use the library, also see examples/example-caf.c. Most applications will probably do something like:
#define BUFFER_LEN 8192 /* some buffer length */
#define FRAME_LENGTH 1024 /* frame length to use in each packet */
technicallyalac a;
uint8_t buffer[BUFFER_LEN];
uint32_t bufferlen = BUFFER_LEN;
technicallyalac_init(&a, FRAME_LENGTH, 44100, 2, 16);
/* check that our buffer is large enough for packets */
assert(BUFFER_LEN >= technicallyalac_max_packet_size(&a));
/* get the "magic cookie" data (ffmpeg calls this "extradata") */
technicallyalac_cookie(&a, buffer, &bufferlen);
/* cookie is in buffer, save it somewhere */
/* assuming:
blocks is a int32_t **,
first dimension is channels, second dimension is samples
so for a stereo file you would have
blocks[2][1024]
then blocks_of_audio == total number of blocks
*/
for(i=0;i<blocks_of_audio;i++) {
/* reset our buffer length */
bufferlen = BUFFER_LEN;
technicallyalac_packet(&f,buffer,&bufferlen,blocks[i].size,blocks[i].data);
/* just write out the buffer for now - in reality this
requires some kind of framing, see example-caf.c for
writing to a Core Audio Format file. */
fwrite(buffer,1,bufferlen,output);
}BSD Zero Clause (see the LICENSE file).