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audio: Explicitly specify endianness for IEC 61937 payloading

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This is required since some systems (DirectSound and OS X) manage the
final byte order themselves.

https://bugzilla.gnome.org/show_bug.cgi?id=678021
This commit is contained in:
Arun Raghavan 2012-09-19 08:52:45 +05:30
parent 17e3dc3357
commit 9f9718715a
3 changed files with 20 additions and 18 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

2
ext/alsa/gstalsasink.c
View file

@ -1113,7 +1113,7 @@ gst_alsasink_payload (GstAudioBaseSink * sink, GstBuffer * buf)
gst_buffer_map (out, &oinfo, GST_MAP_WRITE);
if (!gst_audio_iec61937_payload (iinfo.data, iinfo.size,
oinfo.data, oinfo.size, &sink->ringbuffer->spec)) {
oinfo.data, oinfo.size, &sink->ringbuffer->spec, G_BIG_ENDIAN)) {
gst_buffer_unref (out);
return NULL;
}

33
gst-libs/gst/audio/gstaudioiec61937.c
View file

@ -134,6 +134,7 @@ gst_audio_iec61937_frame_size (const GstAudioRingBufferSpec * spec)
* payloaded contents in. Should not overlap with @src
* @dst_n: size of @dst in bytes
* @spec: the ringbufer spec for @src
* @endianness: the expected byte order of the payloaded data
*
* Payloads @src in the form specified by IEC 61937 for the type from @spec and
* stores the result in @dst. @src must contain exactly one frame of data and
@ -144,7 +145,7 @@ gst_audio_iec61937_frame_size (const GstAudioRingBufferSpec * spec)
*/
gboolean
gst_audio_iec61937_payload (const guint8 * src, guint src_n, guint8 * dst,
guint dst_n, const GstAudioRingBufferSpec * spec)
guint dst_n, const GstAudioRingBufferSpec * spec, gint endianness)
{
guint i, tmp;
#if G_BYTE_ORDER == G_BIG_ENDIAN
@ -291,22 +292,22 @@ gst_audio_iec61937_payload (const guint8 * src, guint src_n, guint8 * dst,
/* Copy the payload */
i = 8;
#if G_BYTE_ORDER == G_BIG_ENDIAN
memcpy (dst + i, src, src_n);
#else
/* Byte-swapped again */
/* FIXME: orc-ify this */
for (tmp = 1; tmp < src_n; tmp += 2) {
dst[i + tmp - 1] = src[tmp];
dst[i + tmp] = src[tmp - 1];
if (G_BYTE_ORDER == endianness) {
memcpy (dst + i, src, src_n);
} else {
/* Byte-swapped again */
/* FIXME: orc-ify this */
for (tmp = 1; tmp < src_n; tmp += 2) {
dst[i + tmp - 1] = src[tmp];
dst[i + tmp] = src[tmp - 1];
}
/* Do we have 1 byte remaining? */
if (src_n % 2) {
dst[i + src_n - 1] = 0;
dst[i + src_n] = src[src_n - 1];
i++;
}
}
/* Do we have 1 byte remaining? */
if (src_n % 2) {
dst[i + src_n - 1] = 0;
dst[i + src_n] = src[src_n - 1];
i++;
}
#endif
i += src_n;

3
gst-libs/gst/audio/gstaudioiec61937.h
View file

@ -27,6 +27,7 @@
guint gst_audio_iec61937_frame_size (const GstAudioRingBufferSpec * spec);
gboolean gst_audio_iec61937_payload (const guint8 * src, guint src_n,
guint8 * dst, guint dst_n,
const GstAudioRingBufferSpec * spec);
const GstAudioRingBufferSpec * spec,
gint endianness);
#endif /* __GST_AUDIO_IEC61937_H__ */