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opusdec: skip pre-skip samples

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This commit is contained in:
Vincent Penquerc'h 2011-11-21 17:01:49 +00:00
parent 1e81bc4b64
commit 354c7824aa
1 changed files with 19 additions and 1 deletions
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20
ext/opus/gstopusdec.c
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@ -168,7 +168,7 @@ gst_opus_dec_parse_header (GstOpusDec * dec, GstBuffer * buf)
g_return_val_if_fail (GST_BUFFER_SIZE (buf) >= 19, GST_FLOW_ERROR);
dec->pre_skip = GST_READ_UINT16_LE (GST_BUFFER_DATA (buf) + 10);
GST_DEBUG_OBJECT (dec, "Found pre-skip of %u samples", dec->pre_skip);
GST_INFO_OBJECT (dec, "Found pre-skip of %u samples", dec->pre_skip);
return GST_FLOW_OK;
}
@ -289,6 +289,24 @@ opus_dec_chain_parse_data (GstOpusDec * dec, GstBuffer * buf)
GST_DEBUG_OBJECT (dec, "decoded %d samples", n);
GST_BUFFER_SIZE (outbuf) = n * 2 * dec->n_channels;
/* Skip any samples that need skipping */
if (dec->pre_skip > 0) {
guint scaled_pre_skip = dec->pre_skip * dec->sample_rate / 48000;
guint skip = scaled_pre_skip > n ? n : scaled_pre_skip;
guint scaled_skip = skip * 48000 / dec->sample_rate;
GST_BUFFER_SIZE (outbuf) -= skip * 2 * dec->n_channels;
GST_BUFFER_DATA (outbuf) += skip * 2 * dec->n_channels;
dec->pre_skip -= scaled_skip;
GST_INFO_OBJECT (dec,
"Skipping %u samples (%u at 48000 Hz, %u left to skip)", skip,
scaled_skip, dec->pre_skip);
if (GST_BUFFER_SIZE (outbuf) == 0) {
gst_buffer_unref (outbuf);
outbuf = NULL;
}
}
res = gst_audio_decoder_finish_frame (GST_AUDIO_DECODER (dec), outbuf, 1);
if (res != GST_FLOW_OK)