On 22/12/2024 05:25, Benjamin Cheng via ffmpeg-devel wrote:
Some drivers are more strict about the size of the reference lists given
(i.e. VAOn12 [1]). The next_prev list is used to handle multiple "L0"
references in AV1 encode. Restrict the size of next_prev based on the
value of ref_l0 when the GOP structure is initialized.

[1] https://github.com/intel/cartwheel-ffmpeg/issues/278

v2: fix indentation issues
---
  libavcodec/hw_base_encode.c | 7 +++++--
  libavcodec/hw_base_encode.h | 4 ++++
  2 files changed, 9 insertions(+), 2 deletions(-)

diff --git a/libavcodec/hw_base_encode.c b/libavcodec/hw_base_encode.c
index 4d8bf4fe71..b790091d7d 100644
--- a/libavcodec/hw_base_encode.c
+++ b/libavcodec/hw_base_encode.c
@@ -190,12 +190,12 @@ static void 
hw_base_encode_add_next_prev(FFHWBaseEncodeContext *ctx,
          return;
      }
- if (ctx->nb_next_prev < MAX_PICTURE_REFERENCES) {
+    if (ctx->nb_next_prev < ctx->ref_l0) {
          ctx->next_prev[ctx->nb_next_prev++] = pic;
          ++pic->ref_count[0];
      } else {
          --ctx->next_prev[0]->ref_count[0];
-        for (i = 0; i < MAX_PICTURE_REFERENCES - 1; i++)
+        for (i = 0; i < ctx->ref_l0 - 1; i++)
              ctx->next_prev[i] = ctx->next_prev[i + 1];
          ctx->next_prev[i] = pic;
          ++pic->ref_count[0];
@@ -662,6 +662,9 @@ int ff_hw_base_init_gop_structure(FFHWBaseEncodeContext 
*ctx, AVCodecContext *av
                                    uint32_t ref_l0, uint32_t ref_l1,
                                    int flags, int prediction_pre_only)
  {
+    ctx->ref_l0 = FFMIN(ref_l0, MAX_PICTURE_REFERENCES);
+    ctx->ref_l1 = FFMIN(ref_l1, MAX_PICTURE_REFERENCES);
+
      if (flags & FF_HW_FLAG_INTRA_ONLY || avctx->gop_size <= 1) {
          av_log(avctx, AV_LOG_VERBOSE, "Using intra frames only.\n");
          ctx->gop_size = 1;
diff --git a/libavcodec/hw_base_encode.h b/libavcodec/hw_base_encode.h
index e30b1e60ad..e768579722 100644
--- a/libavcodec/hw_base_encode.h
+++ b/libavcodec/hw_base_encode.h
@@ -193,6 +193,10 @@ typedef struct FFHWBaseEncodeContext {
      int end_of_stream;
      int p_to_gpb;
+ // The number of L0/L1 references supported by the driver.
+    int             ref_l0;
+    int             ref_l1;
+
      // Whether the driver supports ROI at all.
      int             roi_allowed;

Looks fine, I'll push this soon.

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