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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

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minimp3.h+5−0
@@ -1645,6 +1645,11 @@ int mp3dec_decode_frame(mp3dec_t *dec, const uint8_t *mp3, int mp3_bytes, short · 1644 unmodified lines
16451645 info->layer = 4 - HDR_GET_LAYER(hdr);
16461646 info->bitrate_kbps = hdr_bitrate_kbps(hdr);
16471647
1648+ if (!pcm)
1649+ {
1650+ return hdr_frame_samples(hdr);
1651+ }
1652+
16481653 bs_init(bs_frame, hdr + HDR_SIZE, frame_size - HDR_SIZE);
16491654 if (HDR_IS_CRC(hdr))
16501655 {

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