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aacenc: add an info log to ask users to resample

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Lynne
2026-07-19 13:48:34 +08:00
parent 9d0a4132ff
commit ddc587bad1
1 changed files with 12 additions and 6 deletions
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18
libavcodec/aacenc.c
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@@ -1661,12 +1661,9 @@ static av_cold int aac_encode_init(AVCodecContext *avctx)
(avctx->bit_rate / 2.0f * (s->lambda / 120.f) * 1.5f) :
(avctx->bit_rate / avctx->ch_layout.nb_channels);
/* For NMR, the rate to bandwidth conversion was tuned to maximize
* metrics over a variable cutoff x bitrate combo (>= 48kbps/ch tracks
* the bandwidth the strongest encoders deliver; wider regresses). */
if (s->options.coder == AAC_CODER_NMR && frame_br >= 32000) {
static const int rates[] = { 32000, 48000, 64000, 96000, 192000 };
static const int bws[] = { 14000, 18500, 20000, 21000, 22000 };
if (s->options.coder == AAC_CODER_NMR && frame_br >= 24000) {
static const int rates[] = { 24000, 32000, 48000, 64000, 96000, 192000 };
static const int bws[] = { 14000, 14000, 18500, 20000, 21000, 22000 };
int bw_i = 0;
for (; bw_i < FF_ARRAY_ELEMS(rates) - 2 && frame_br > rates[bw_i + 1]; bw_i++);
s->bandwidth = bws[bw_i] + (int)((int64_t)(bws[bw_i + 1] - bws[bw_i]) *
@@ -1682,6 +1679,15 @@ static av_cold int aac_encode_init(AVCodecContext *avctx)
s->bandwidth = FFMIN(FFMAX(s->bandwidth, 8000), avctx->sample_rate / 2);
}
if (!(avctx->flags & AV_CODEC_FLAG_QSCALE) && avctx->bit_rate > 0) {
int bpc = avctx->bit_rate / avctx->ch_layout.nb_channels;
if (bpc <= 32000 && avctx->sample_rate > 32000)
av_log(avctx, AV_LOG_INFO,
"%d kb/s per channel at %d Hz: consider resampling the "
"input to 32000 Hz or lower for better quality.\n",
bpc / 1000, avctx->sample_rate);
}
// Initialize static tables
ff_aac_float_common_init();