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avcodec/libopusenc: Fix for header pre-skip value

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The Opus header initial padding preskip amount is always to be expressed
relative to 48kHz. However, the encoder delay returned from querying
libopus is relative to the encoding samplerate. Multiply by the
samplerate conversion factor to correct.

Signed-off-by: Arthur Taylor <art@ified.ca>
This commit is contained in:
Arthur Taylor 2021-01-07 12:55:59 -08:00 committed by Lynne
parent 66deab3a26
commit f4bdeddc3c
1 changed files with 1 additions and 1 deletions
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libavcodec/libopusenc.c
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@ -94,7 +94,7 @@ static void libopus_write_header(AVCodecContext *avctx, int stream_count,
bytestream_put_buffer(&p, "OpusHead", 8);
bytestream_put_byte(&p, 1); /* Version */
bytestream_put_byte(&p, channels);
bytestream_put_le16(&p, avctx->initial_padding); /* Lookahead samples at 48kHz */
bytestream_put_le16(&p, avctx->initial_padding * 48000 / avctx->sample_rate); /* Lookahead samples at 48kHz */
bytestream_put_le32(&p, avctx->sample_rate); /* Original sample rate */
bytestream_put_le16(&p, 0); /* Gain of 0dB is recommended. */