diff --git a/gst-libs/gst/video/video-resampler.c b/gst-libs/gst/video/video-resampler.c index 64c4734977..e68a65f869 100644 --- a/gst-libs/gst/video/video-resampler.c +++ b/gst-libs/gst/video/video-resampler.c @@ -117,69 +117,48 @@ get_nearest_tap (ResamplerParams * params, gint l, gint xi, gdouble x) static gdouble get_linear_tap (ResamplerParams * params, gint l, gint xi, gdouble x) { - gdouble n_taps; gdouble res, a; gint xl = xi + l; - n_taps = (params->resampler->max_taps + 1) / 2; + a = fabs (x - xl) * params->fx; - a = fabs (x - xl); - - if (a < n_taps) - res = (n_taps - a) / (gdouble) n_taps; + if (a < 1.0) + res = 1.0 - a; else res = 0.0; return res; } -static gdouble -bicubic (gdouble s, gdouble b, gdouble c) -{ - gdouble s2, s3; - - s = fabs (s); - s2 = s * s; - s3 = s2 * s; - - if (s <= 1.0) - return ((12.0 - 9.0 * b - 6.0 * c) * s3 + - (-18.0 + 12.0 * b + 6.0 * c) * s2 + (6.0 - 2.0 * b)) / 6.0; - else if (s <= 2.0) - return ((-b - 6.0 * c) * s3 + - (6.0 * b + 30.0 * c) * s2 + - (-12.0 * b - 48.0 * c) * s + (8.0 * b + 24.0 * c)) / 6.0; - else - return 0.0; -} - static gdouble get_cubic_tap (ResamplerParams * params, gint l, gint xi, gdouble x) { - gdouble a, b, c, res; + gdouble a, a2, a3, b, c; + gint xl = xi + l; - a = x - (xi + 1); + a = fabs (x - xl) * params->fx; + a2 = a * a; + a3 = a2 * a; b = params->b; c = params->c; - if (l == 0) - res = bicubic (1.0 + a, b, c); - else if (l == 1) - res = bicubic (a, b, c); - else if (l == 2) - res = bicubic (1.0 - a, b, c); + if (a <= 1.0) + return ((12.0 - 9.0 * b - 6.0 * c) * a3 + + (-18.0 + 12.0 * b + 6.0 * c) * a2 + (6.0 - 2.0 * b)) / 6.0; + else if (a <= 2.0) + return ((-b - 6.0 * c) * a3 + + (6.0 * b + 30.0 * c) * a2 + + (-12.0 * b - 48.0 * c) * a + (8.0 * b + 24.0 * c)) / 6.0; else - res = bicubic (2.0 - a, b, c); - - return res; + return 0.0; } static gdouble get_sinc_tap (ResamplerParams * params, gint l, gint xi, gdouble x) { gint xl = xi + l; - return sinc (x - xl); + return sinc ((x - xl) * params->fx); } static gdouble @@ -337,6 +316,7 @@ gst_video_resampler_init (GstVideoResampler * resampler, { ResamplerParams params; gint max_taps; + gdouble scale_factor; g_return_val_if_fail (in_size != 0, FALSE); g_return_val_if_fail (out_size != 0, FALSE); @@ -353,6 +333,16 @@ gst_video_resampler_init (GstVideoResampler * resampler, GST_DEBUG ("%d %u %u->%u", method, n_taps, in_size, out_size); + params.sharpness = GET_OPT_SHARPNESS (options); + params.sharpen = GET_OPT_SHARPEN (options); + + scale_factor = in_size / (gdouble) out_size; + if (scale_factor > 1.0) { + params.fx = (1.0 / scale_factor) * params.sharpness; + } else { + params.fx = (1.0) * params.sharpness; + } + max_taps = GET_OPT_MAX_TAPS (options); n_taps = CLAMP (n_taps, 0, max_taps); @@ -364,50 +354,35 @@ gst_video_resampler_init (GstVideoResampler * resampler, break; case GST_VIDEO_RESAMPLER_METHOD_LINEAR: params.get_tap = get_linear_tap; - if (n_taps == 0) - n_taps = 2; + params.envelope = 1.0; break; case GST_VIDEO_RESAMPLER_METHOD_CUBIC: params.b = GET_OPT_CUBIC_B (options); params.c = GET_OPT_CUBIC_C (options); - n_taps = 4; + params.envelope = 2.0; params.get_tap = get_cubic_tap; break; case GST_VIDEO_RESAMPLER_METHOD_SINC: + params.envelope = GET_OPT_ENVELOPE (options); params.get_tap = get_sinc_tap; - if (n_taps == 0) - n_taps = 4; break; case GST_VIDEO_RESAMPLER_METHOD_LANCZOS: - { - params.envelope = GET_OPT_ENVELOPE (options); - params.sharpness = GET_OPT_SHARPNESS (options); - params.sharpen = GET_OPT_SHARPEN (options); - - if (n_taps == 0) { - gdouble resample_inc = in_size / (gdouble) out_size; - - if (resample_inc > 1.0) { - params.fx = (1.0 / resample_inc) * params.sharpness; - } else { - params.fx = (1.0) * params.sharpness; - } - params.ex = params.fx / params.envelope; - params.dx = ceil (params.envelope / params.fx); - - n_taps = CLAMP (2 * params.dx, 0, max_taps); - } - params.fx = 2.0 * params.envelope / n_taps; - params.ex = 2.0 / n_taps; - params.get_tap = get_lanczos_tap; break; - } default: break; } + if (n_taps == 0) { + params.dx = ceil (2.0 * params.envelope / params.fx); + n_taps = CLAMP (params.dx, 0, max_taps); + } + params.fx = 2.0 * params.envelope / n_taps; + params.ex = 2.0 / n_taps; + + g_print ("%d\n", n_taps); + if (n_taps > in_size) n_taps = in_size;