libmp3lame: add comments about CBR/VBR modes

292dbe5e · Timothy Gu · Vittorio Giovara · 729d821f · 292dbe5e
Commit 292dbe5e authored Oct 24, 2013 by Timothy Gu Committed by Vittorio Giovara Mar 30, 2014
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libmp3lame.c libavcodec/libmp3lame.c +2 -2

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--- a/libavcodec/libmp3lame.c
+++ b/libavcodec/libmp3lame.c
@@ -110,11 +110,11 @@ static av_cold int mp3lame_encode_init(AVCodecContext *avctx)
        lame_set_quality(s->gfp, avctx->compression_level);

    /* rate control */
-    if (avctx->flags & CODEC_FLAG_QSCALE) {
+    if (avctx->flags & CODEC_FLAG_QSCALE) { // VBR
        lame_set_VBR(s->gfp, vbr_default);
        lame_set_VBR_quality(s->gfp, avctx->global_quality / (float)FF_QP2LAMBDA);
    } else {
-        if (avctx->bit_rate)
+        if (avctx->bit_rate)                // CBR
            lame_set_brate(s->gfp, avctx->bit_rate / 1000);
    }