static
int encode(aacenc_param_ex_t *params, pcm_reader_t *reader,
HANDLE_AACENCODER encoder, uint32_t frame_length,
m4af_ctx_t *m4af)
{
int16_t *ibuf = 0, *ip;
aacenc_frame_t obuf[2] = {{ 0 }}, *obp;
unsigned flip = 0;
int nread = 1;
int rc = -1;
int remaining, consumed;
int frames_written = 0, encoded = 0;
aacenc_progress_t progress = { 0 };
const pcm_sample_description_t *fmt = pcm_get_format(reader);
ibuf = malloc(frame_length * fmt->bytes_per_frame);
aacenc_progress_init(&progress, pcm_get_length(reader), fmt->sample_rate);
for (;;) {
/*
* Since we delay the write, we cannot just exit loop when interrupted.
* Instead, we regard it as EOF.
*/
if (g_interrupted)
nread = 0;
if (nread > 0) {
if ((nread = pcm_read_frames(reader, ibuf, frame_length)) < 0) {
fprintf(stderr, "ERROR: read failed\n");
goto END;
}
if (!params->silent)
aacenc_progress_update(&progress, pcm_get_position(reader),
fmt->sample_rate * 2);
}
ip = ibuf;
remaining = nread;
do {
obp = &obuf[flip];
consumed = aac_encode_frame(encoder, fmt, ip, remaining, obp);
if (consumed < 0) goto END;
if (consumed == 0 && obp->size == 0) goto DONE;
if (obp->size == 0) break;
remaining -= consumed;
ip += consumed * fmt->channels_per_frame;
flip ^= 1;
/*
* As we pad 1 frame at beginning and ending by our extrapolator,
* we want to drop them.
* We delay output by 1 frame by double buffering, and discard
* second frame and final frame from the encoder.
* Since sbr_header is included in the first frame (in case of
* SBR), we cannot discard first frame. So we pick second instead.
*/
++encoded;
if (encoded == 1 || encoded == 3)
continue;
obp = &obuf[flip];
if (write_sample(params->output_fp, m4af, obp) < 0)
goto END;
++frames_written;
} while (remaining > 0);
}
DONE:
if (!params->silent)
aacenc_progress_finish(&progress, pcm_get_position(reader));
rc = frames_written;
END:
if (ibuf) free(ibuf);
if (obuf[0].data) free(obuf[0].data);
if (obuf[1].data) free(obuf[1].data);
return rc;
}
static int64_t get_length(pcm_reader_t *reader)
{
return pcm_get_length(get_source(reader));
}
