This logic only covers the case of yuv420p. Extend this logic to cover *all* vertically subsampled YUV formats, which require the same interlaced scaling logic. Fortunately, we can get away with re-using the same code for both JPEG and MPEG range YUV, because the only difference here is the horizontal alignment. (Which I omit touching for now, to avoid introducing possibly unintended changes in default behavior)
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| @@ -518,6 +518,7 @@ static int config_props(AVFilterLink *outlink) · 517 unmodified lines | |||
| 518 | outlink->src->inputs[0]; | 518 | outlink->src->inputs[0]; |
| 519 | enum AVPixelFormat outfmt = outlink->format; | 519 | enum AVPixelFormat outfmt = outlink->format; |
| 520 | const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format); | 520 | const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format); |
| 521 | const AVPixFmtDescriptor *outdesc = av_pix_fmt_desc_get(outfmt); | ||
| 521 | ScaleContext *scale = ctx->priv; | 522 | ScaleContext *scale = ctx->priv; |
| 522 | uint8_t *flags_val = NULL; | 523 | uint8_t *flags_val = NULL; |
| 523 | int ret; | 524 | int ret; |
| @@ -588,14 +589,15 @@ static int config_props(AVFilterLink *outlink) · 64 unmodified lines | |||
| 588 | av_opt_set_int(s, "dst_range", | 589 | av_opt_set_int(s, "dst_range", |
| 589 | scale->out_range == AVCOL_RANGE_JPEG, 0); | 590 | scale->out_range == AVCOL_RANGE_JPEG, 0); |
| 590 | 591 | ||
| 591 | /* Override YUV420P default settings to have the correct (MPEG-2) chroma positions | 592 | /* Override chroma location default settings to have the correct |
| 592 | * MPEG-2 chroma positions are used by convention | 593 | * chroma positions. MPEG chroma positions are used by convention. |
| 593 | * XXX: support other 4:2:0 pixel formats */ | 594 | * Note that this works for both MPEG-1/JPEG and MPEG-2/4 chroma |
| 594 | if (inlink0->format == AV_PIX_FMT_YUV420P && scale->in_v_chr_pos == -513) { | 595 | * locations, since they share a vertical alignment */ |
| 596 | if (desc->log2_chroma_h == 1 && scale->in_v_chr_pos == -513) { | ||
| 595 | in_v_chr_pos = (i == 0) ? 128 : (i == 1) ? 64 : 192; | 597 | in_v_chr_pos = (i == 0) ? 128 : (i == 1) ? 64 : 192; |
| 596 | } | 598 | } |
| 597 | 599 | ||
| 598 | if (outlink->format == AV_PIX_FMT_YUV420P && scale->out_v_chr_pos == -513) { | 600 | if (outdesc->log2_chroma_h == 1 && scale->out_v_chr_pos == -513) { |
| 599 | out_v_chr_pos = (i == 0) ? 128 : (i == 1) ? 64 : 192; | 601 | out_v_chr_pos = (i == 0) ? 128 : (i == 1) ? 64 : 192; |
| 600 | } | 602 | } |
| 601 | 603 | ||