added option to decode headers only If the 'pcm' parameter to mp3dec_decode_frame() is set to NULL, all bitstream and audio decoding is skipped, but the header is still decoded and frame info is still generated. This is useful for quickly scanning an MP3 file, e.g. to determine the duration or generate a VBR seek index.

Martin Fiedler committed 8 years ago

Commit 7a6445e1 parent 337b2521 file · +5 −0Browse files

Unified · Split

     info->layer = 4 - HDR_GET_LAYER(hdr);
     info->bitrate_kbps = hdr_bitrate_kbps(hdr);
+    if (!pcm)
+    {
+        return hdr_frame_samples(hdr);
+    }
     bs_init(bs_frame, hdr + HDR_SIZE, frame_size - HDR_SIZE);
     if (HDR_IS_CRC(hdr))
     {

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