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qtmux: Calculate clean aperture size

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Calculate clean aperture dimensions by first guessing
display aspect ratio based on pixel aspect ratio and
frame size.

https://bugzilla.gnome.org/show_bug.cgi?id=777100
This commit is contained in:
Georg Lippitsch 2017-01-11 18:29:05 +01:00 committed by Sebastian Dröge
parent e12c94065d
commit fcdba65302
1 changed files with 46 additions and 25 deletions
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71
gst/isomp4/gstqtmux.c
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@ -4416,40 +4416,61 @@ gst_qt_mux_video_sink_set_caps (GstQTPad * qtpad, GstCaps * caps)
}
if (qtmux_klass->format == GST_QT_MUX_FORMAT_QT) {
if (qtmux_klass->format == GST_QT_MUX_FORMAT_QT &&
width > 640 && width <= 1052 && height >= 480 && height <= 576) {
/* The 'clap' extension is also defined for MP4 but inventing values in
* general seems a bit tricky for this one. We only write it for MOV
* then, where it is a requirement.
* general seems a bit tricky for this one. We only write it for
* SD resolution in MOV, where it is a requirement.
* The same goes for the 'tapt' extension, just that it is not defined for
* MP4 and only for MOV
*
* NTSC and PAL have special values, otherwise just take width and height
*/
if (width == 720 && (height == 480 || height == 486)) {
ext_atom = build_clap_extension (704, 1, height, 1, 0, 1, 0, 1);
if (ext_atom)
ext_atom_list = g_list_append (ext_atom_list, ext_atom);
gint dar_num, dar_den;
gint clef_width, clef_height, prof_width;
gint clap_width_n, clap_width_d, clap_height;
gint cdiv;
double approx_dar;
} else if (width == 720 && height == 576) {
ext_atom = build_clap_extension (768 * 54, 59, 576, 1, 0, 1, 0, 1);
if (ext_atom)
ext_atom_list = g_list_append (ext_atom_list, ext_atom);
/* First, guess display aspect ratio based on pixel aspect ratio,
* width and height. We assume that display aspect ratio is either
* 4:3 or 16:9
*/
approx_dar = (gdouble) (width * par_num) / (height * par_den);
if (approx_dar > 11.0 / 9 && approx_dar < 14.0 / 9) {
dar_num = 4;
dar_den = 3;
} else if (approx_dar > 15.0 / 9 && approx_dar < 18.0 / 9) {
dar_num = 16;
dar_den = 9;
} else {
ext_atom = build_clap_extension (width, 1, height, 1, 0, 1, 0, 1);
if (ext_atom)
ext_atom_list = g_list_append (ext_atom_list, ext_atom);
dar_num = width * par_num;
dar_den = height * par_den;
cdiv = gst_util_greatest_common_divisor (dar_num, dar_den);
dar_num /= cdiv;
dar_den /= cdiv;
}
if (par_num != par_den) {
gint clef_width =
gst_util_uint64_scale (width, par_num * G_GUINT64_CONSTANT (65536),
par_den);
/* Then, calculate clean-aperture values (clap and clef)
* using the guessed DAR.
*/
clef_height = clap_height = (height == 486 ? 480 : height);
clef_width = gst_util_uint64_scale (clef_height,
dar_num * G_GUINT64_CONSTANT (65536), dar_den);
prof_width = gst_util_uint64_scale (width,
par_num * G_GUINT64_CONSTANT (65536), par_den);
clap_width_n = clap_height * dar_num * par_den;
clap_width_d = dar_den * par_num;
cdiv = gst_util_greatest_common_divisor (clap_width_n, clap_width_d);
clap_width_n /= cdiv;
clap_width_d /= cdiv;
ext_atom =
build_tapt_extension (clef_width, height << 16, clef_width,
height << 16, width << 16, height << 16);
qtpad->trak->tapt = ext_atom;
}
ext_atom = build_tapt_extension (clef_width, clef_height << 16, prof_width,
height << 16, width << 16, height << 16);
qtpad->trak->tapt = ext_atom;
ext_atom = build_clap_extension (clap_width_n, clap_width_d,
clap_height, 1, 0, 1, 0, 1);
if (ext_atom)
ext_atom_list = g_list_append (ext_atom_list, ext_atom);
}
/* ok, set the pad info accordingly */