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audioconvert: enhance transforming caps

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... so as to preserve input format precision,
and preferably not convert at all.
This commit is contained in:
Mark Nauwelaerts 2012-10-18 22:13:09 +02:00
parent b57d3252ec
commit a66ff00908
1 changed files with 61 additions and 0 deletions
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61
gst/audioconvert/gstaudioconvert.c
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@ -435,6 +435,64 @@ find_suitable_mask (guint64 mask, gint n_chans)
return 0;
}
static void
gst_audio_convert_fixate_format (GstBaseTransform * base, GstStructure * ins,
GstStructure * outs)
{
const gchar *in_format;
const GValue *format;
const GstAudioFormatInfo *in_info, *out_info = NULL;
in_format = gst_structure_get_string (ins, "format");
if (!in_format)
return;
format = gst_structure_get_value (outs, "format");
/* should not happen */
if (format == NULL)
return;
in_info =
gst_audio_format_get_info (gst_audio_format_from_string (in_format));
if (!in_info)
return;
if (GST_VALUE_HOLDS_LIST (format)) {
gint i, len;
len = gst_value_list_get_size (format);
for (i = 0; i < len; i++) {
const GValue *val;
const gchar *fname;
val = gst_value_list_get_value (format, i);
if (G_VALUE_HOLDS_STRING (val)) {
fname = g_value_get_string (val);
out_info =
gst_audio_format_get_info (gst_audio_format_from_string (fname));
if (!out_info)
continue;
/* accept input format */
if (strcmp (fname, in_format) == 0)
break;
/* or another format without losing precision */
if ((GST_AUDIO_FORMAT_INFO_FLAGS (out_info) ==
GST_AUDIO_FORMAT_INFO_FLAGS (in_info)) &&
(GST_AUDIO_FORMAT_INFO_DEPTH (out_info) >=
GST_AUDIO_FORMAT_INFO_DEPTH (in_info)))
break;
}
out_info = NULL;
}
if (out_info)
gst_structure_set (outs, "format", G_TYPE_STRING,
GST_AUDIO_FORMAT_INFO_NAME (out_info), NULL);
} else {
/* nothing to fixate */
return;
}
}
static void
gst_audio_convert_fixate_channels (GstBaseTransform * base, GstStructure * ins,
GstStructure * outs)
@ -626,6 +684,9 @@ gst_audio_convert_fixate_caps (GstBaseTransform * base,
outs = gst_caps_get_structure (result, 0);
gst_audio_convert_fixate_channels (base, ins, outs);
gst_audio_convert_fixate_format (base, ins, outs);
/* fixate remaining */
result = gst_caps_fixate (result);
GST_DEBUG_OBJECT (base, "fixated othercaps to %" GST_PTR_FORMAT, result);