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alsa: Use 8 bit pointer type for byte-based pointer arithmetic

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Usually these loops only run once, so there's no problem here. But sometimes
they run twice, and by adding the number of bytes to a 16 bit pointer type we
would advance twice as much as we should.

Also use snd_pcm_frames_to_bytes() in alsasrc to calculate
the number of bytes to skip, same as we do in alsasink.

Thanks to Lucio A. Hernandez <lucio.a.hernandez@gmail.com> for reporting.
This commit is contained in:
Sebastian Dröge 2015-10-14 00:32:11 +03:00
parent b60ab758e4
commit 4fe12c1b09
2 changed files with 5 additions and 5 deletions
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5
ext/alsa/gstalsasink.c
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@ -1020,16 +1020,17 @@ gst_alsasink_write (GstAudioSink * asink, gpointer data, guint length)
GstAlsaSink *alsa;
gint err;
gint cptr;
gint16 *ptr = data;
guint8 *ptr = data;
alsa = GST_ALSA_SINK (asink);
if (alsa->iec958 && alsa->need_swap) {
guint i;
guint16 *ptr_tmp = (guint16 *) ptr;
GST_DEBUG_OBJECT (asink, "swapping bytes");
for (i = 0; i < length / 2; i++) {
ptr[i] = GUINT16_SWAP_LE_BE (ptr[i]);
ptr_tmp[i] = GUINT16_SWAP_LE_BE (ptr_tmp[i]);
}
}

5
ext/alsa/gstalsasrc.c
View file

@ -954,12 +954,11 @@ gst_alsasrc_read (GstAudioSrc * asrc, gpointer data, guint length,
GstAlsaSrc *alsa;
gint err;
gint cptr;
gint16 *ptr;
guint8 *ptr = data;
alsa = GST_ALSA_SRC (asrc);
cptr = length / alsa->bpf;
ptr = data;
GST_ALSA_SRC_LOCK (asrc);
while (cptr > 0) {
@ -975,7 +974,7 @@ gst_alsasrc_read (GstAudioSrc * asrc, gpointer data, guint length,
continue;
}
ptr += err * alsa->channels;
ptr += snd_pcm_frames_to_bytes (alsa->handle, err);
cptr -= err;
}
GST_ALSA_SRC_UNLOCK (asrc);