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gst/audioconvert/gstaudioconvert.c: Patch from #341562: give more specific audio caps in get_caps, so that basetransf...
Original commit message from CVS: * gst/audioconvert/gstaudioconvert.c: (make_lossless_changes), (append_with_other_format), (set_structure_widths), (gst_audio_convert_transform_caps): Patch from #341562: give more specific audio caps in get_caps, so that basetransform can make better decisions on what caps to negotiate.
This commit is contained in:
Michael Smith
parent
e4dbbc2048
commit
8e09be1bd9
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@ -1,3 +1,12 @@
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2006-05-29 Michael Smith <msmith@fluendo.com>
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* gst/audioconvert/gstaudioconvert.c: (make_lossless_changes),
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(append_with_other_format), (set_structure_widths),
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(gst_audio_convert_transform_caps):
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Patch from #341562: give more specific audio caps in get_caps, so
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that basetransform can make better decisions on what caps to
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negotiate.
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2006-05-28 Stefan Kost <ensonic@users.sf.net>
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* tests/check/elements/volume.c:
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@ -156,8 +156,6 @@ GST_STATIC_CAPS ( \
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static GstAudioChannelPosition *supported_positions;
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static GstStaticCaps gst_audio_convert_static_caps = STATIC_CAPS;
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static GstStaticPadTemplate gst_audio_convert_src_template =
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GST_STATIC_PAD_TEMPLATE ("src",
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GST_PAD_SRC,
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@ -318,37 +316,224 @@ parse_error:
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}
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}
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/* audioconvert can convert anything except sample rate; so return template
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* caps with rate fixed */
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/* FIXME:
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* it would be smart here to return the caps with the same width as the first
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/* Modify the structure so that things that must always have a single
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* value (for float), or can always be losslessly converted (for int), have
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* appropriate values.
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*/
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static GstStructure *
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make_lossless_changes (GstStructure * s, gboolean isfloat)
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{
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if (isfloat) {
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/* float doesn't have depth, and only supports width 32, and native-endian
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*/
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gst_structure_remove_field (s, "depth");
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gst_structure_set (s, "width", G_TYPE_INT, 32, NULL);
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gst_structure_set (s, "endianness", G_TYPE_INT, G_BYTE_ORDER, NULL);
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} else {
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/* int supports either endian, and signed or unsigned. GValues are a pain */
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GValue list = { 0 };
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GValue val = { 0 };
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int i;
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gint endian[] = { G_LITTLE_ENDIAN, G_BIG_ENDIAN };
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gboolean booleans[] = { TRUE, FALSE };
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g_value_init (&list, GST_TYPE_LIST);
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g_value_init (&val, G_TYPE_INT);
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for (i = 0; i < 2; i++) {
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g_value_set_int (&val, endian[i]);
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gst_value_list_append_value (&list, &val);
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}
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gst_structure_set_value (s, "endianness", &list);
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g_value_unset (&val);
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g_value_unset (&list);
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g_value_init (&list, GST_TYPE_LIST);
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g_value_init (&val, G_TYPE_BOOLEAN);
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for (i = 0; i < 2; i++) {
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g_value_set_boolean (&val, booleans[i]);
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gst_value_list_append_value (&list, &val);
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}
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gst_structure_set_value (s, "signed", &list);
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g_value_unset (&val);
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g_value_unset (&list);
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}
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return s;
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}
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/* Little utility function to create a related structure for float/int */
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static void
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append_with_other_format (GstCaps * caps, GstStructure * s, gboolean isfloat)
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{
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GstStructure *s2;
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if (isfloat) {
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s2 = gst_structure_copy (s);
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gst_structure_set_name (s2, "audio/x-raw-int");
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s = make_lossless_changes (s2, FALSE);
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gst_caps_append_structure (caps, s2);
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} else {
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s2 = gst_structure_copy (s);
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gst_structure_set_name (s2, "audio/x-raw-float");
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s = make_lossless_changes (s2, TRUE);
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gst_caps_append_structure (caps, s2);
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}
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}
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/* Set widths (a list); multiples of 8 between min and max */
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static void
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set_structure_widths (GstStructure * s, int min, int max)
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{
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GValue list = { 0 };
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GValue val = { 0 };
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int width;
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if (min == max) {
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gst_structure_set (s, "width", G_TYPE_INT, min, NULL);
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return;
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}
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g_value_init (&list, GST_TYPE_LIST);
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g_value_init (&val, G_TYPE_INT);
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for (width = min; width <= max; width += 8) {
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g_value_set_int (&val, width);
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gst_value_list_append_value (&list, &val);
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GST_DEBUG ("Appended width %d to widths available", width);
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}
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gst_structure_set_value (s, "width", &list);
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g_value_unset (&val);
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g_value_unset (&list);
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}
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/* Audioconvert can perform all conversions on audio except for resampling.
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* However, there are some conversions we _prefer_ not to do. For example, it's
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* better to convert format (float<->int, endianness, etc) than the number of
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* channels, as the latter conversion is not lossless.
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*
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* So, we return, in order (assuming input caps have only one structure;
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* is this right?):
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* - input caps with a different format (lossless conversions).
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* - input caps with a different format (slightly lossy conversions).
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* - input caps with a different number of channels (very lossy!)
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*/
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static GstCaps *
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gst_audio_convert_transform_caps (GstBaseTransform * base,
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GstPadDirection direction, GstCaps * caps)
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{
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int i;
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const GValue *rate;
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GstCaps *ret;
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GstStructure *structure;
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GstStructure *s, *structure;
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gboolean isfloat;
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gint width, depth, channels;
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gchar *fields_used[] = { "width", "depth", "rate", "channels", "endianness",
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"signed"
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};
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int i;
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g_return_val_if_fail (GST_CAPS_IS_SIMPLE (caps), NULL);
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structure = gst_caps_get_structure (caps, 0);
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ret = gst_static_caps_get (&gst_audio_convert_static_caps);
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isfloat = strcmp (gst_structure_get_name (structure),
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"audio/x-raw-float") == 0;
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/* if rate not set, we return the template */
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if (!(rate = gst_structure_get_value (structure, "rate")))
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return ret;
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/* else, write rate in the template caps */
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ret = gst_caps_make_writable (ret);
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for (i = 0; i < gst_caps_get_size (ret); ++i) {
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structure = gst_caps_get_structure (ret, i);
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gst_structure_set_value (structure, "rate", rate);
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/* We operate on a version of the original structure with any additional
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* fields absent */
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s = gst_structure_empty_new (gst_structure_get_name (structure));
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for (i = 0; i < sizeof (fields_used) / sizeof (*fields_used); i++) {
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if (gst_structure_has_field (structure, fields_used[i]))
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gst_structure_set_value (s, fields_used[i],
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gst_structure_get_value (structure, fields_used[i]));
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}
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if (!isfloat) {
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/* Commonly, depth is left out: set it equal to width if we have a fixed
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* width, if so */
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if (!gst_structure_has_field (s, "depth") &&
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gst_structure_get_int (s, "width", &width))
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gst_structure_set (s, "depth", G_TYPE_INT, width, NULL);
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}
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ret = gst_caps_new_empty ();
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/* All lossless conversions */
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s = make_lossless_changes (s, isfloat);
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gst_caps_append_structure (ret, s);
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/* Same, plus a float<->int conversion */
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append_with_other_format (ret, s, isfloat);
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/* We don't mind increasing width/depth/channels, but reducing them is
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* Very Bad. Only available if width, depth, channels are already fixed. */
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s = gst_structure_copy (s);
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if (!isfloat) {
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if (gst_structure_get_int (structure, "width", &width))
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set_structure_widths (s, width, 32);
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if (gst_structure_get_int (structure, "depth", &depth)) {
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if (depth == 32)
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gst_structure_set (s, "depth", G_TYPE_INT, 32, NULL);
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else
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gst_structure_set (s, "depth", GST_TYPE_INT_RANGE, depth, 32, NULL);
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}
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}
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if (gst_structure_get_int (structure, "channels", &channels)) {
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if (channels == 8)
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gst_structure_set (s, "channels", G_TYPE_INT, 8, NULL);
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else
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gst_structure_set (s, "channels", GST_TYPE_INT_RANGE, channels, 8, NULL);
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}
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gst_caps_append_structure (ret, s);
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/* Same, plus a float<->int conversion */
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append_with_other_format (ret, s, isfloat);
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/* We'll reduce depth if we must... only for integer, since we can't do this
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* for float. We reduce as low as 16 bits; reducing to less than this is
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* even worse than dropping channels. We only do this if we haven't already
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* done the equivalent above. */
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if (!gst_structure_get_int (structure, "width", &width) || width > 16) {
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if (isfloat) {
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/* These are invalid widths/depths for float, but we don't actually use
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* them - we just pass it to append_with_other_format, which makes them
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* valid
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*/
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GstStructure *s2 = gst_structure_copy (s);
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set_structure_widths (s2, 16, 32);
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gst_structure_set (s2, "depth", GST_TYPE_INT_RANGE, 16, 32, NULL);
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append_with_other_format (ret, s2, TRUE);
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gst_structure_free (s2);
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} else {
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s = gst_structure_copy (s);
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set_structure_widths (s, 16, 32);
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gst_structure_set (s, "depth", GST_TYPE_INT_RANGE, 16, 32, NULL);
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gst_caps_append_structure (ret, s);
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}
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}
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/* Channel conversions to fewer channels is only done if needed - generally
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* it's very bad to drop channels entirely.
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*/
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s = gst_structure_copy (s);
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gst_structure_set (s, "channels", GST_TYPE_INT_RANGE, 1, 8, NULL);
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gst_caps_append_structure (ret, s);
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/* Same, plus a float<->int conversion */
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append_with_other_format (ret, s, isfloat);
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/* And, finally, for integer only, we allow conversion to any width/depth we
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* support: this should be equivalent to our (non-float) template caps. (the
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* floating point case should be being handled just above) */
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s = gst_structure_copy (s);
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set_structure_widths (s, 8, 32);
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gst_structure_set (s, "depth", GST_TYPE_INT_RANGE, 1, 32, NULL);
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if (isfloat) {
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append_with_other_format (ret, s, TRUE);
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gst_structure_free (s);
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} else
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gst_caps_append_structure (ret, s);
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return ret;
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}
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