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audioresample: Fix buffer size transformations

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When calculating the input/output buffer sizes in the transform_size function,
take the number of channels into account, so we don't end up calculating
a buffer size that only contains a partial number of audio frames.

Also, when going from output size to input size, round down rather than
up, so as to calculate the minimum number of samples that *might* yield
a buffer of the intended destination size.

Fixes: #580470 and #580952
This commit is contained in:
Jan Schmidt 2009-05-01 16:47:53 +01:00
parent d14c80b22e
commit 02a7b31f0e
1 changed files with 17 additions and 17 deletions
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34
gst/audioresample/gstaudioresample.c
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@ -525,7 +525,7 @@ gst_audio_resample_transform_size (GstBaseTransform * base,
gboolean ret = TRUE;
guint32 ratio_den, ratio_num;
gint inrate, outrate, gcd;
gint width;
gint bytes_per_samp, channels;
GST_LOG_OBJECT (base, "asked to transform size %d in direction %s",
size, direction == GST_PAD_SINK ? "SINK" : "SRC");
@ -537,37 +537,37 @@ gst_audio_resample_transform_size (GstBaseTransform * base,
srccaps = caps;
}
/* Get sample width -> bytes_per_samp, channels, inrate, outrate */
ret =
gst_audio_resample_parse_caps (caps, othercaps, &width, NULL, &inrate,
&outrate, NULL);
gst_audio_resample_parse_caps (caps, othercaps, &bytes_per_samp,
&channels, &inrate, &outrate, NULL);
if (G_UNLIKELY (!ret)) {
GST_ERROR_OBJECT (base, "Wrong caps");
return FALSE;
}
/* Number of samples in either buffer is size / (width*channels) ->
* calculate the factor */
bytes_per_samp = bytes_per_samp * channels / 8;
/* Convert source buffer size to samples */
size /= bytes_per_samp;
/* Simplify the conversion ratio factors */
gcd = _gcd (inrate, outrate);
ratio_num = inrate / gcd;
ratio_den = outrate / gcd;
if (direction == GST_PAD_SINK) {
gint fac = width / 8;
/* asked to convert size of an incoming buffer */
size /= fac;
/* asked to convert size of an incoming buffer. Round up the output size */
*othersize = (size * ratio_den + ratio_num - 1) / ratio_num;
*othersize *= fac;
size *= fac;
*othersize *= bytes_per_samp;
} else {
gint fac = width / 8;
/* asked to convert size of an outgoing buffer */
size /= fac;
*othersize = (size * ratio_num + ratio_den - 1) / ratio_den;
*othersize *= fac;
size *= fac;
/* asked to convert size of an outgoing buffer. Round down the input size */
*othersize = (size * ratio_num) / ratio_den;
*othersize *= bytes_per_samp;
}
GST_LOG_OBJECT (base, "transformed size %d to %d", size, *othersize);
GST_LOG_OBJECT (base, "transformed size %d to %d", size * bytes_per_samp,
*othersize);
return ret;
}