avcodec/hevcdec: export cropping information instead of handling it internally

This merges commit a02ae1c683 from libav,
originally written by Anton Khirnov and skipped in
fc63d5ceb3.

 libavcodec/hevc_parser.c |  6 ++++--
 libavcodec/hevc_ps.c     | 31 ++++++++++++-------------------
 libavcodec/hevc_ps.h     |  2 --
 libavcodec/hevc_refs.c   | 18 +++++-------------
 libavcodec/hevcdec.c     |  7 ++++---
 libavcodec/hevcdec.h     |  2 --
 6 files changed, 25 insertions(+), 41 deletions(-)

Signed-off-by: James Almer <jamrial@gmail.com>

libavcodec/hevc_parser.c

@@ -57,6 +57,7 @@ static int hevc_parse_slice_header(AVCodecParserContext *s, H2645NAL *nal,
     HEVCSEIContext *sei = &ctx->sei;
     SliceHeader *sh = &ctx->sh;
     GetBitContext *gb = &nal->gb;
+    const HEVCWindow *ow;
     int i, num = 0, den = 0;
 
     sh->first_slice_in_pic_flag = get_bits1(gb);
@@ -83,11 +84,12 @@ static int hevc_parse_slice_header(AVCodecParserContext *s, H2645NAL *nal,
         ps->sps = (HEVCSPS*)ps->sps_list[ps->pps->sps_id]->data;
         ps->vps = (HEVCVPS*)ps->vps_list[ps->sps->vps_id]->data;
     }
+    ow  = &ps->sps->output_window;
 
     s->coded_width  = ps->sps->width;
     s->coded_height = ps->sps->height;
-    s->width        = ps->sps->output_width;
-    s->height       = ps->sps->output_height;
+    s->width        = ps->sps->width  - ow->left_offset - ow->right_offset;
+    s->height       = ps->sps->height - ow->top_offset  - ow->bottom_offset;
     s->format       = ps->sps->pix_fmt;
     avctx->profile  = ps->sps->ptl.general_ptl.profile_idc;
     avctx->level    = ps->sps->ptl.general_ptl.level_idc;

libavcodec/hevc_ps.c

@@ -826,6 +826,7 @@ static int map_pixel_format(AVCodecContext *avctx, HEVCSPS *sps)
 int ff_hevc_parse_sps(HEVCSPS *sps, GetBitContext *gb, unsigned int *sps_id,
                       int apply_defdispwin, AVBufferRef **vps_list, AVCodecContext *avctx)
 {
+    HEVCWindow *ow;
     int ret = 0;
     int log2_diff_max_min_transform_block_size;
     int bit_depth_chroma, start, vui_present, sublayer_ordering_info;
@@ -1092,30 +1093,21 @@ int ff_hevc_parse_sps(HEVCSPS *sps, GetBitContext *gb, unsigned int *sps_id,
         sps->output_window.top_offset    += sps->vui.def_disp_win.top_offset;
         sps->output_window.bottom_offset += sps->vui.def_disp_win.bottom_offset;
     }
-    if (sps->output_window.left_offset & (0x1F >> (sps->pixel_shift)) &&
-        !(avctx->flags & AV_CODEC_FLAG_UNALIGNED)) {
-        sps->output_window.left_offset &= ~(0x1F >> (sps->pixel_shift));
-        av_log(avctx, AV_LOG_WARNING, "Reducing left output window to %d "
-               "chroma samples to preserve alignment.\n",
-               sps->output_window.left_offset);
-    }
-    sps->output_width  = sps->width -
-                         (sps->output_window.left_offset + sps->output_window.right_offset);
-    sps->output_height = sps->height -
-                         (sps->output_window.top_offset + sps->output_window.bottom_offset);
-    if (sps->width  <= sps->output_window.left_offset + (int64_t)sps->output_window.right_offset  ||
-        sps->height <= sps->output_window.top_offset  + (int64_t)sps->output_window.bottom_offset) {
-        av_log(avctx, AV_LOG_WARNING, "Invalid visible frame dimensions: %dx%d.\n",
-               sps->output_width, sps->output_height);
+
+    ow = &sps->output_window;
+    if (ow->left_offset >= INT_MAX - ow->right_offset     ||
+        ow->top_offset  >= INT_MAX - ow->bottom_offset    ||
+        ow->left_offset + ow->right_offset  >= sps->width ||
+        ow->top_offset  + ow->bottom_offset >= sps->height) {
+        av_log(avctx, AV_LOG_WARNING, "Invalid cropping offsets: %u/%u/%u/%u\n",
+               ow->left_offset, ow->right_offset, ow->top_offset, ow->bottom_offset);
         if (avctx->err_recognition & AV_EF_EXPLODE) {
             return AVERROR_INVALIDDATA;
         }
         av_log(avctx, AV_LOG_WARNING,
                "Displaying the whole video surface.\n");
+        memset(ow, 0, sizeof(*ow));
         memset(&sps->pic_conf_win, 0, sizeof(sps->pic_conf_win));
-        memset(&sps->output_window, 0, sizeof(sps->output_window));
-        sps->output_width               = sps->width;
-        sps->output_height              = sps->height;
     }
 
     // Inferred parameters
@@ -1221,7 +1213,8 @@ int ff_hevc_decode_nal_sps(GetBitContext *gb, AVCodecContext *avctx,
                "Parsed SPS: id %d; coded wxh: %dx%d; "
                "cropped wxh: %dx%d; pix_fmt: %s.\n",
                sps_id, sps->width, sps->height,
-               sps->output_width, sps->output_height,
+               sps->width - (sps->output_window.left_offset + sps->output_window.right_offset),
+               sps->height - (sps->output_window.top_offset + sps->output_window.bottom_offset),
                av_get_pix_fmt_name(sps->pix_fmt));
     }
 

libavcodec/hevc_ps.h

@@ -227,8 +227,6 @@ typedef struct HEVCSPS {
     int chroma_format_idc;
     uint8_t separate_colour_plane_flag;
 
-    ///< output (i.e. cropped) values
-    int output_width, output_height;
     HEVCWindow output_window;
 
     HEVCWindow pic_conf_win;

libavcodec/hevc_refs.c

@@ -163,7 +163,10 @@ int ff_hevc_set_new_ref(HEVCContext *s, AVFrame **frame, int poc)
 
     ref->poc      = poc;
     ref->sequence = s->seq_decode;
-    ref->window   = s->ps.sps->output_window;
+    ref->frame->crop_left   = s->ps.sps->output_window.left_offset;
+    ref->frame->crop_right  = s->ps.sps->output_window.right_offset;
+    ref->frame->crop_top    = s->ps.sps->output_window.top_offset;
+    ref->frame->crop_bottom = s->ps.sps->output_window.bottom_offset;
 
     return 0;
 }
@@ -204,12 +207,8 @@ int ff_hevc_output_frame(HEVCContext *s, AVFrame *out, int flush)
 
         if (nb_output) {
             HEVCFrame *frame = &s->DPB[min_idx];
-            AVFrame *dst = out;
-            AVFrame *src = frame->frame;
-            const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(src->format);
-            int pixel_shift = !!(desc->comp[0].depth > 8);
 
-            ret = av_frame_ref(out, src);
+            ret = av_frame_ref(out, frame->frame);
             if (frame->flags & HEVC_FRAME_FLAG_BUMPING)
                 ff_hevc_unref_frame(s, frame, HEVC_FRAME_FLAG_OUTPUT | HEVC_FRAME_FLAG_BUMPING);
             else
@@ -217,13 +216,6 @@ int ff_hevc_output_frame(HEVCContext *s, AVFrame *out, int flush)
             if (ret < 0)
                 return ret;
 
-            for (i = 0; i < 3; i++) {
-                int hshift = (i > 0) ? desc->log2_chroma_w : 0;
-                int vshift = (i > 0) ? desc->log2_chroma_h : 0;
-                int off = ((frame->window.left_offset >> hshift) << pixel_shift) +
-                          (frame->window.top_offset   >> vshift) * dst->linesize[i];
-                dst->data[i] += off;
-            }
             av_log(s->avctx, AV_LOG_DEBUG,
                    "Output frame with POC %d.\n", frame->poc);
             return 1;

libavcodec/hevcdec.c

@@ -288,13 +288,14 @@ static void export_stream_params(AVCodecContext *avctx, const HEVCParamSets *ps,
                                  const HEVCSPS *sps)
 {
     const HEVCVPS *vps = (const HEVCVPS*)ps->vps_list[sps->vps_id]->data;
+    const HEVCWindow *ow = &sps->output_window;
     unsigned int num = 0, den = 0;
 
     avctx->pix_fmt             = sps->pix_fmt;
     avctx->coded_width         = sps->width;
     avctx->coded_height        = sps->height;
-    avctx->width               = sps->output_width;
-    avctx->height              = sps->output_height;
+    avctx->width               = sps->width  - ow->left_offset - ow->right_offset;
+    avctx->height              = sps->height - ow->top_offset  - ow->bottom_offset;
     avctx->has_b_frames        = sps->temporal_layer[sps->max_sub_layers - 1].num_reorder_pics;
     avctx->profile             = sps->ptl.general_ptl.profile_idc;
     avctx->level               = sps->ptl.general_ptl.level_idc;
@@ -3118,7 +3119,6 @@ static int hevc_ref_frame(HEVCContext *s, HEVCFrame *dst, HEVCFrame *src)
 
     dst->poc        = src->poc;
     dst->ctb_count  = src->ctb_count;
-    dst->window     = src->window;
     dst->flags      = src->flags;
     dst->sequence   = src->sequence;
 
@@ -3404,6 +3404,6 @@ AVCodec ff_hevc_decoder = {
     .init_thread_copy      = hevc_init_thread_copy,
     .capabilities          = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_DELAY |
                              AV_CODEC_CAP_SLICE_THREADS | AV_CODEC_CAP_FRAME_THREADS,
-    .caps_internal         = FF_CODEC_CAP_INIT_THREADSAFE,
+    .caps_internal         = FF_CODEC_CAP_INIT_THREADSAFE | FF_CODEC_CAP_EXPORTS_CROPPING,
     .profiles              = NULL_IF_CONFIG_SMALL(ff_hevc_profiles),
 };

libavcodec/hevcdec.h

@@ -317,8 +317,6 @@ typedef struct HEVCFrame {
     int poc;
     struct HEVCFrame *collocated_ref;
 
-    HEVCWindow window;
-
     AVBufferRef *tab_mvf_buf;
     AVBufferRef *rpl_tab_buf;
     AVBufferRef *rpl_buf;