[FFmpeg-devel] [PATCH 11/39] lavc/ffv1enc: move bit writer to per-slice context

[Anton Khirnov <anton@khirnov.net>]

---
 libavcodec/ffv1.h             |  3 ++-
 libavcodec/ffv1enc.c          |  7 ++++---
 libavcodec/ffv1enc_template.c | 14 +++++++-------
 3 files changed, 13 insertions(+), 11 deletions(-)

diff --git a/libavcodec/ffv1.h b/libavcodec/ffv1.h
index c88aa8c30d..dce6e177eb 100644
--- a/libavcodec/ffv1.h
+++ b/libavcodec/ffv1.h
@@ -79,13 +79,14 @@ typedef struct FFV1SliceContext {
     int slice_y;
 
     int run_index;
+
+    PutBitContext pb;
 } FFV1SliceContext;
 
 typedef struct FFV1Context {
     AVClass *class;
     AVCodecContext *avctx;
     RangeCoder c;
-    PutBitContext pb;
     uint64_t rc_stat[256][2];
     uint64_t (*rc_stat2[MAX_QUANT_TABLES])[32][2];
     int version;
diff --git a/libavcodec/ffv1enc.c b/libavcodec/ffv1enc.c
index 8bb9174a1d..5692bfa1fc 100644
--- a/libavcodec/ffv1enc.c
+++ b/libavcodec/ffv1enc.c
@@ -1057,7 +1057,7 @@ retry:
     }
     if (fs->ac == AC_GOLOMB_RICE) {
         fs->ac_byte_count = f->version > 2 || (!x && !y) ? ff_rac_terminate(&fs->c, f->version > 2) : 0;
-        init_put_bits(&fs->pb,
+        init_put_bits(&sc->pb,
                       fs->c.bytestream_start + fs->ac_byte_count,
                       fs->c.bytestream_end - fs->c.bytestream_start - fs->ac_byte_count);
     }
@@ -1209,13 +1209,14 @@ static int encode_frame(AVCodecContext *avctx, AVPacket *pkt,
     buf_p = pkt->data;
     for (i = 0; i < f->slice_count; i++) {
         FFV1Context *fs = f->slice_context[i];
+        FFV1SliceContext *sc = &f->slices[i];
         int bytes;
 
         if (fs->ac != AC_GOLOMB_RICE) {
             bytes = ff_rac_terminate(&fs->c, 1);
         } else {
-            flush_put_bits(&fs->pb); // FIXME: nicer padding
-            bytes = fs->ac_byte_count + put_bytes_output(&fs->pb);
+            flush_put_bits(&sc->pb); // FIXME: nicer padding
+            bytes = fs->ac_byte_count + put_bytes_output(&sc->pb);
         }
         if (i > 0 || f->version > 2) {
             av_assert0(bytes < pkt->size / f->slice_count);
diff --git a/libavcodec/ffv1enc_template.c b/libavcodec/ffv1enc_template.c
index 4dccd531a8..8b9e53fa1b 100644
--- a/libavcodec/ffv1enc_template.c
+++ b/libavcodec/ffv1enc_template.c
@@ -39,7 +39,7 @@ RENAME(encode_line)(FFV1Context *s, FFV1SliceContext *sc,
             return AVERROR_INVALIDDATA;
         }
     } else {
-        if (put_bytes_left(&s->pb, 0) < w * 4) {
+        if (put_bytes_left(&sc->pb, 0) < w * 4) {
             av_log(s->avctx, AV_LOG_ERROR, "encoded frame too large\n");
             return AVERROR_INVALIDDATA;
         }
@@ -86,10 +86,10 @@ RENAME(encode_line)(FFV1Context *s, FFV1SliceContext *sc,
                     while (run_count >= 1 << ff_log2_run[run_index]) {
                         run_count -= 1 << ff_log2_run[run_index];
                         run_index++;
-                        put_bits(&s->pb, 1, 1);
+                        put_bits(&sc->pb, 1, 1);
                     }
 
-                    put_bits(&s->pb, 1 + ff_log2_run[run_index], run_count);
+                    put_bits(&sc->pb, 1 + ff_log2_run[run_index], run_count);
                     if (run_index)
                         run_index--;
                     run_count = 0;
@@ -103,21 +103,21 @@ RENAME(encode_line)(FFV1Context *s, FFV1SliceContext *sc,
 
             ff_dlog(s->avctx, "count:%d index:%d, mode:%d, x:%d pos:%d\n",
                     run_count, run_index, run_mode, x,
-                    (int)put_bits_count(&s->pb));
+                    (int)put_bits_count(&sc->pb));
 
             if (run_mode == 0)
-                put_vlc_symbol(&s->pb, &p->vlc_state[context], diff, bits);
+                put_vlc_symbol(&sc->pb, &p->vlc_state[context], diff, bits);
         }
     }
     if (run_mode) {
         while (run_count >= 1 << ff_log2_run[run_index]) {
             run_count -= 1 << ff_log2_run[run_index];
             run_index++;
-            put_bits(&s->pb, 1, 1);
+            put_bits(&sc->pb, 1, 1);
         }
 
         if (run_count)
-            put_bits(&s->pb, 1, 1);
+            put_bits(&sc->pb, 1, 1);
     }
     sc->run_index = run_index;
 
-- 
2.43.0

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