[FFmpeg-devel] [PATCH] HEVC: Export motion vectors to frame side data.

Asaf Kave kaveasaf at gmail.com
Sun Dec 29 16:08:27 EET 2019


---
 libavcodec/hevc_refs.c |  15 ++++
 libavcodec/hevcdec.c   | 173 ++++++++++++++++++++++++++++++++++++++++-
 libavcodec/hevcdec.h   |  13 ++++
 3 files changed, 200 insertions(+), 1 deletion(-)

diff --git a/libavcodec/hevc_refs.c b/libavcodec/hevc_refs.c
index 7870a72fd6..20f028fa73 100644
--- a/libavcodec/hevc_refs.c
+++ b/libavcodec/hevc_refs.c
@@ -42,6 +42,9 @@ void ff_hevc_unref_frame(HEVCContext *s, HEVCFrame *frame, int flags)
         av_buffer_unref(&frame->tab_mvf_buf);
         frame->tab_mvf = NULL;
 
+        av_buffer_unref(&frame->cuh_buf);
+        frame->cuh = NULL;
+
         av_buffer_unref(&frame->rpl_buf);
         av_buffer_unref(&frame->rpl_tab_buf);
         frame->rpl_tab    = NULL;
@@ -101,11 +104,17 @@ static HEVCFrame *alloc_frame(HEVCContext *s)
             goto fail;
         frame->tab_mvf = (MvField *)frame->tab_mvf_buf->data;
 
+        frame->cuh_buf = av_buffer_pool_get(s->cuh_pool);
+        if (!frame->cuh_buf)
+            goto fail;
+        frame->cuh = (CodingUnitHelper *)frame->cuh_buf->data;
+
         frame->rpl_tab_buf = av_buffer_pool_get(s->rpl_tab_pool);
         if (!frame->rpl_tab_buf)
             goto fail;
         frame->rpl_tab   = (RefPicListTab **)frame->rpl_tab_buf->data;
         frame->ctb_count = s->ps.sps->ctb_width * s->ps.sps->ctb_height;
+        frame->cu_count = 0;
         for (j = 0; j < frame->ctb_count; j++)
             frame->rpl_tab[j] = (RefPicListTab *)frame->rpl_buf->data;
 
@@ -161,6 +170,10 @@ int ff_hevc_set_new_ref(HEVCContext *s, AVFrame **frame, int poc)
     else
         ref->flags = HEVC_FRAME_FLAG_SHORT_REF;
 
+    if (s->avctx->flags2 & AV_CODEC_FLAG2_EXPORT_MVS) {
+        ref->flags |= HEVC_FRAME_FLAG_MV;
+    }
+
     ref->poc      = poc;
     ref->sequence = s->seq_decode;
     ref->frame->crop_left   = s->ps.sps->output_window.left_offset;
@@ -216,6 +229,8 @@ int ff_hevc_output_frame(HEVCContext *s, AVFrame *out, int flush)
             if (ret < 0)
                 return ret;
 
+            s->output_frame_poc = frame->poc;
+
             av_log(s->avctx, AV_LOG_DEBUG,
                    "Output frame with POC %d.\n", frame->poc);
             return 1;
diff --git a/libavcodec/hevcdec.c b/libavcodec/hevcdec.c
index 19b0cd815d..aedc559283 100644
--- a/libavcodec/hevcdec.c
+++ b/libavcodec/hevcdec.c
@@ -32,6 +32,7 @@
 #include "libavutil/opt.h"
 #include "libavutil/pixdesc.h"
 #include "libavutil/stereo3d.h"
+#include "libavutil/motion_vector.h"
 
 #include "bswapdsp.h"
 #include "bytestream.h"
@@ -80,6 +81,7 @@ static void pic_arrays_free(HEVCContext *s)
     av_freep(&s->sh.offset);
 
     av_buffer_pool_uninit(&s->tab_mvf_pool);
+    av_buffer_pool_uninit(&s->cuh_pool);
     av_buffer_pool_uninit(&s->rpl_tab_pool);
 }
 
@@ -128,9 +130,11 @@ static int pic_arrays_init(HEVCContext *s, const HEVCSPS *sps)
 
     s->tab_mvf_pool = av_buffer_pool_init(min_pu_size * sizeof(MvField),
                                           av_buffer_allocz);
+    s->cuh_pool = av_buffer_pool_init(min_pu_size * sizeof(CodingUnitHelper),
+                                          av_buffer_allocz);
     s->rpl_tab_pool = av_buffer_pool_init(ctb_count * sizeof(RefPicListTab),
                                           av_buffer_allocz);
-    if (!s->tab_mvf_pool || !s->rpl_tab_pool)
+    if (!s->tab_mvf_pool || !s->rpl_tab_pool || !s->cuh_pool)
         goto fail;
 
     return 0;
@@ -1806,6 +1810,7 @@ static void hls_prediction_unit(HEVCContext *s, int x0, int y0,
     int min_pu_width = s->ps.sps->min_pu_width;
 
     MvField *tab_mvf = s->ref->tab_mvf;
+    CodingUnitHelper *cuh = s->ref->cuh;
     RefPicList  *refPicList = s->ref->refPicList;
     HEVCFrame *ref0 = NULL, *ref1 = NULL;
     uint8_t *dst0 = POS(0, x0, y0);
@@ -1843,6 +1848,9 @@ static void hls_prediction_unit(HEVCContext *s, int x0, int y0,
         for (i = 0; i < nPbW >> s->ps.sps->log2_min_pu_size; i++)
             tab_mvf[(y_pu + j) * min_pu_width + x_pu + i] = current_mv;
 
+    struct CodingUnitHelper cuh_ = {lc->cu, log2_cb_size };
+    cuh[s->ref->cu_count++] = cuh_;
+
     if (current_mv.pred_flag & PF_L0) {
         ref0 = refPicList[0].ref[current_mv.ref_idx[0]];
         if (!ref0)
@@ -3192,6 +3200,160 @@ static int hevc_decode_extradata(HEVCContext *s, uint8_t *buf, int length, int f
     return 0;
 }
 
+static int set_mv(AVMotionVector *mv, int puW, int puH,
+                  int dst_x, int dst_y,
+                  int motion_x, int motion_y, int motion_scale,
+                  int direction)
+{
+    mv->w = puW;
+    mv->h = puH;
+    mv->motion_x = motion_x;
+    mv->motion_y = motion_y;
+    mv->motion_scale = motion_scale;
+    mv->dst_x = dst_x;
+    mv->dst_y = dst_y;
+    mv->src_x = dst_x + motion_x / motion_scale;
+    mv->src_y = dst_y + motion_y / motion_scale;
+    mv->source = direction ? 1 : -1;
+    mv->flags = 0;
+
+    return 1;
+}
+
+static int add_mv(HEVCContext *s, AVMotionVector *mvs, MvField current_mv, int x0, int y0, int width, int height)
+{
+    int sx, sy, count = 0;
+    const int scale = 4;
+
+    sx = x0 + (width / 2);
+    sy = y0 + (height / 2);
+
+    if (current_mv.pred_flag & PF_L0) {
+      count += set_mv(mvs + count, width, height , sx, sy, current_mv.mv[0].x, current_mv.mv[0].y, scale, 0);
+    }
+
+    if (current_mv.pred_flag & PF_L1) {
+      count += set_mv(mvs + count, width, height , sx, sy, current_mv.mv[1].x, current_mv.mv[1].y, scale, 1);
+    }
+
+    return count;
+}
+
+static int export_mvs(HEVCContext *s, AVFrame *out)
+{
+    int x0, y0, i, log2_cb_size;
+    int mv_count = 0;
+    HEVCFrame* pFrame = NULL;
+    struct MvField current_mv = {{{ 0 }}};
+
+    /* Find the next output picture\frame tp export it VMs */
+    for (i = 0; i < FF_ARRAY_ELEMS(s->DPB) && pFrame == NULL; i++) {
+        HEVCFrame *frame = &s->DPB[i];
+        if (frame->flags & (HEVC_FRAME_FLAG_OUTPUT | HEVC_FRAME_FLAG_MV) &&
+            frame->poc == s->output_frame_poc) {
+            pFrame = frame;
+        }
+    }
+
+    if(pFrame == NULL) {
+        av_log(s->avctx, AV_LOG_WARNING,
+            "Not exporting MVs for frame POC %d", s->poc);
+        return -1;
+    }
+
+    MvField *tab_mvf = pFrame->tab_mvf;
+
+    const int min_pu_width = s->ps.sps->min_pu_width;
+    const unsigned log2_min_pu_size = s->ps.sps->log2_min_pu_size;
+
+    /* size is number of [coding units * 2 * 4] where 2 is for directions and 4 is
+     * for the maximum number of part mode */
+    AVMotionVector *mvs = av_malloc_array(pFrame->cu_count, 2 * 4 * sizeof(AVMotionVector));
+    if (!mvs) {
+        av_log(s->avctx, AV_LOG_WARNING,
+            "Failed to allocate Motion Vector array for frame POC %d", s->poc);
+        ff_hevc_unref_frame(s, pFrame, HEVC_FRAME_FLAG_MV);
+        return -1;
+    }
+
+    for (i = 0; i < pFrame->cu_count; ++i) {
+
+        const CodingUnitHelper current_cu = pFrame->cuh[i];
+        /* Export only INTER prediction coding units */
+        if(current_cu.cu.pred_mode != MODE_INTER)
+            continue;
+
+        y0 = current_cu.cu.y;
+        x0 = current_cu.cu.x;
+        log2_cb_size = current_cu.log2_cu_size;
+        enum PartMode part_mode = current_cu.cu.part_mode;
+
+        int cb_size = 1<<log2_cb_size;
+
+        current_mv = tab_mvf[(y0 >> log2_min_pu_size) * min_pu_width +
+                       (x0 >> log2_min_pu_size)];
+
+        const int half_cb_size = 1<<(log2_cb_size-1);
+        switch (part_mode) {
+            case PART_2Nx2N:
+            mv_count += add_mv(s, mvs + mv_count, current_mv, x0, y0, cb_size, cb_size);
+            break;
+            case PART_NxN:
+            mv_count += add_mv(s, mvs + mv_count, current_mv, x0, y0, cb_size/2, cb_size/2);
+            mv_count += add_mv(s, mvs + mv_count, current_mv, x0+half_cb_size, y0, cb_size/2, cb_size/2);
+            mv_count += add_mv(s, mvs + mv_count, current_mv, x0, y0+half_cb_size, cb_size/2, cb_size/2);
+            mv_count += add_mv(s, mvs + mv_count, current_mv, x0+half_cb_size, y0+half_cb_size, cb_size/2, cb_size/2);
+            break;
+            case PART_2NxN:
+            mv_count += add_mv(s, mvs + mv_count, current_mv, x0, y0, cb_size, cb_size/2);
+            mv_count += add_mv(s, mvs + mv_count, current_mv, x0, y0+half_cb_size, cb_size, cb_size/2);
+            break;
+            case PART_Nx2N:
+            mv_count += add_mv(s, mvs + mv_count, current_mv, x0, y0, cb_size/2, cb_size);
+            mv_count += add_mv(s, mvs + mv_count, current_mv, x0+half_cb_size, y0, cb_size/2, cb_size);
+            break;
+            case PART_2NxnU:
+            mv_count += add_mv(s, mvs + mv_count, current_mv, x0, y0, cb_size, cb_size/4);
+            mv_count += add_mv(s, mvs + mv_count, current_mv, x0, y0+cb_size/4, cb_size, cb_size*3/4);
+            break;
+            case PART_2NxnD:
+            mv_count += add_mv(s, mvs + mv_count, current_mv, x0, y0, cb_size, cb_size*3/4);
+            mv_count += add_mv(s, mvs + mv_count, current_mv, x0, y0+cb_size*3/4, cb_size, cb_size/4);
+            break;
+            case PART_nLx2N:
+            mv_count += add_mv(s, mvs + mv_count, current_mv, x0, y0, cb_size/4, cb_size);
+            mv_count += add_mv(s, mvs + mv_count, current_mv, x0+cb_size/4, y0, cb_size*3/4, cb_size);
+            break;
+            case PART_nRx2N:
+            mv_count += add_mv(s, mvs + mv_count, current_mv, x0, y0, cb_size*3/4, cb_size);
+            mv_count += add_mv(s, mvs + mv_count, current_mv, x0*3/4, y0, cb_size/4, cb_size);
+            break;
+            default:
+            break;
+        }
+    }
+
+    if (mv_count) {
+        AVFrameSideData *sd;
+
+        av_log(s->avctx, AV_LOG_DEBUG, "Adding %d MVs info to frame with POC %d", mv_count, s->poc);
+        sd = av_frame_new_side_data(out, AV_FRAME_DATA_MOTION_VECTORS, mv_count * sizeof(AVMotionVector));
+        if (!sd) {
+            av_log(s->avctx, AV_LOG_WARNING, "Failed to create side data MVs info to frame POC %d", s->poc);
+            av_freep(&mvs);
+            ff_hevc_unref_frame(s, pFrame, HEVC_FRAME_FLAG_MV);
+            return -1;
+        }
+        memcpy(sd->data, mvs, mv_count * sizeof(AVMotionVector));
+    }
+
+    /* Cleanup and release */
+    av_freep(&mvs);
+    ff_hevc_unref_frame(s, pFrame, HEVC_FRAME_FLAG_MV);
+
+    return 0;
+}
+
 static int hevc_decode_frame(AVCodecContext *avctx, void *data, int *got_output,
                              AVPacket *avpkt)
 {
@@ -3249,6 +3411,9 @@ static int hevc_decode_frame(AVCodecContext *avctx, void *data, int *got_output,
 
     if (s->output_frame->buf[0]) {
         av_frame_move_ref(data, s->output_frame);
+        if (s->avctx->flags2 & AV_CODEC_FLAG2_EXPORT_MVS) {
+            export_mvs(s, data);
+            }
         *got_output = 1;
     }
 
@@ -3277,8 +3442,14 @@ static int hevc_ref_frame(HEVCContext *s, HEVCFrame *dst, HEVCFrame *src)
     if (!dst->rpl_buf)
         goto fail;
 
+    dst->cuh_buf = av_buffer_ref(src->cuh_buf);
+    if (!dst->cuh_buf)
+        goto fail;
+    dst->cuh = src->cuh;
+
     dst->poc        = src->poc;
     dst->ctb_count  = src->ctb_count;
+    dst->cu_count   = src->cu_count;
     dst->flags      = src->flags;
     dst->sequence   = src->sequence;
 
diff --git a/libavcodec/hevcdec.h b/libavcodec/hevcdec.h
index 89e0809850..187c6ec7a2 100644
--- a/libavcodec/hevcdec.h
+++ b/libavcodec/hevcdec.h
@@ -252,6 +252,12 @@ typedef struct CodingUnit {
     uint8_t cu_transquant_bypass_flag;
 } CodingUnit;
 
+typedef struct CodingUnitHelper {
+    CodingUnit cu;
+
+    uint8_t log2_cu_size;
+} CodingUnitHelper;
+
 typedef struct Mv {
     int16_t x;  ///< horizontal component of motion vector
     int16_t y;  ///< vertical component of motion vector
@@ -307,20 +313,24 @@ typedef struct DBParams {
 #define HEVC_FRAME_FLAG_SHORT_REF (1 << 1)
 #define HEVC_FRAME_FLAG_LONG_REF  (1 << 2)
 #define HEVC_FRAME_FLAG_BUMPING   (1 << 3)
+#define HEVC_FRAME_FLAG_MV        (1 << 4)
 
 typedef struct HEVCFrame {
     AVFrame *frame;
     ThreadFrame tf;
     MvField *tab_mvf;
+    CodingUnitHelper *cuh;
     RefPicList *refPicList;
     RefPicListTab **rpl_tab;
     int ctb_count;
     int poc;
+    int cu_count;
     struct HEVCFrame *collocated_ref;
 
     AVBufferRef *tab_mvf_buf;
     AVBufferRef *rpl_tab_buf;
     AVBufferRef *rpl_buf;
+    AVBufferRef *cuh_buf;
 
     AVBufferRef *hwaccel_priv_buf;
     void *hwaccel_picture_private;
@@ -405,11 +415,14 @@ typedef struct HEVCContext {
     uint8_t *sao_pixel_buffer_h[3];
     uint8_t *sao_pixel_buffer_v[3];
 
+    int output_frame_poc;
+
     HEVCParamSets ps;
     HEVCSEI sei;
     struct AVMD5 *md5_ctx;
 
     AVBufferPool *tab_mvf_pool;
+    AVBufferPool *cuh_pool;
     AVBufferPool *rpl_tab_pool;
 
     ///< candidate references for the current frame
-- 
2.17.1



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