[FFmpeg-devel] [PATCH 29/41] avcodec/mpegvideo: Move header_bits to MPVMainEncContext

[Andreas Rheinhardt <andreas.rheinhardt@outlook.com>]

The header is always written by the main thread, so it is
not surprising that header_bits can be moved to MPVMainEncContext
as well.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
---
 libavcodec/mjpegenc.c      | 14 ++++++++------
 libavcodec/mpegvideo.h     |  1 -
 libavcodec/mpegvideo_enc.c |  6 +++---
 libavcodec/mpegvideoenc.h  |  2 ++
 libavcodec/ratecontrol.c   |  2 +-
 5 files changed, 14 insertions(+), 11 deletions(-)

diff --git a/libavcodec/mjpegenc.c b/libavcodec/mjpegenc.c
index 23772c4c1f..a8efe72231 100644
--- a/libavcodec/mjpegenc.c
+++ b/libavcodec/mjpegenc.c
@@ -103,8 +103,9 @@ void ff_mjpeg_amv_encode_picture_header(MPVMainEncContext *main)
  *
  * @param s The MPVEncContext.
  */
-static void mjpeg_encode_picture_frame(MPVEncContext *s)
+static void mjpeg_encode_picture_frame(MPVMainEncContext *main)
 {
+    MPVEncContext *const s = &main->common;
     int nbits, code, table_id;
     MJpegContext *m = s->mjpeg_ctx;
     uint8_t  *huff_size[4] = { m->huff_size_dc_luminance,
@@ -118,7 +119,7 @@ static void mjpeg_encode_picture_frame(MPVEncContext *s)
     size_t total_bits = 0;
     size_t bytes_needed;
 
-    s->header_bits = get_bits_diff(s);
+    main->header_bits = get_bits_diff(s);
     // Estimate the total size first
     for (int i = 0; i < m->huff_ncode; i++) {
         table_id = m->huff_buffer[i].table_id;
@@ -224,6 +225,9 @@ int ff_mjpeg_encode_stuffing(MPVEncContext *s)
 
 #if CONFIG_MJPEG_ENCODER
     if (m->huffman == HUFFMAN_TABLE_OPTIMAL) {
+        /* HUFFMAN_TABLE_OPTIMAL is incompatible with slice threading,
+         * therefore the following cast is allowed. */
+        MPVMainEncContext *const main = (MPVMainEncContext*)s;
 
         mjpeg_build_optimal_huffman(m);
 
@@ -236,10 +240,8 @@ int ff_mjpeg_encode_stuffing(MPVEncContext *s)
         s->intra_chroma_ac_vlc_length      =
         s->intra_chroma_ac_vlc_last_length = m->uni_chroma_ac_vlc_len;
 
-        /* HUFFMAN_TABLE_OPTIMAL is incompatible with slice threading,
-         * therefore the following cast is allowed. */
-        mjpeg_encode_picture_header((MPVMainEncContext*)s);
-        mjpeg_encode_picture_frame(s);
+        mjpeg_encode_picture_header(main);
+        mjpeg_encode_picture_frame(main);
     }
 #endif
 
diff --git a/libavcodec/mpegvideo.h b/libavcodec/mpegvideo.h
index 8b5916f68d..ed1416fca6 100644
--- a/libavcodec/mpegvideo.h
+++ b/libavcodec/mpegvideo.h
@@ -299,7 +299,6 @@ typedef struct MPVContext {
 
     /* statistics, used for 2-pass encoding */
     int mv_bits;
-    int header_bits;
     int i_tex_bits;
     int p_tex_bits;
     int i_count;
diff --git a/libavcodec/mpegvideo_enc.c b/libavcodec/mpegvideo_enc.c
index 36e14efea2..22f4cd2d0e 100644
--- a/libavcodec/mpegvideo_enc.c
+++ b/libavcodec/mpegvideo_enc.c
@@ -1737,7 +1737,7 @@ vbv_retry:
         frame_end(m);
 
        if ((CONFIG_MJPEG_ENCODER || CONFIG_AMV_ENCODER) && s->out_format == FMT_MJPEG)
-            ff_mjpeg_encode_picture_trailer(&s->pb, s->header_bits);
+            ff_mjpeg_encode_picture_trailer(&s->pb, m->header_bits);
 
         if (avctx->rc_buffer_size) {
             RateControlContext *rcc = &m->rc_context;
@@ -1794,7 +1794,7 @@ vbv_retry:
                                        s->pict_type);
 
         if (avctx->flags & AV_CODEC_FLAG_PASS1)
-            assert(put_bits_count(&s->pb) == s->header_bits + s->mv_bits +
+            assert(put_bits_count(&s->pb) == m->header_bits + s->mv_bits +
                                              s->misc_bits + s->i_tex_bits +
                                              s->p_tex_bits);
         flush_put_bits(&s->pb);
@@ -3754,7 +3754,7 @@ static int encode_picture(MPVMainEncContext *m, int picture_number)
         av_assert0(0);
     }
     bits= put_bits_count(&s->pb);
-    s->header_bits= bits - s->last_bits;
+    m->header_bits = bits - s->last_bits;
 
     for(i=1; i<context_count; i++){
         update_duplicate_context_after_me(s->thread_context[i], s);
diff --git a/libavcodec/mpegvideoenc.h b/libavcodec/mpegvideoenc.h
index 8e6c45c0b6..55c265edbe 100644
--- a/libavcodec/mpegvideoenc.h
+++ b/libavcodec/mpegvideoenc.h
@@ -60,6 +60,8 @@ typedef struct MPVMainEncContext {
     int last_non_b_pict_type;   ///< used for MPEG-4 gmc B-frames & ratecontrol
     int last_lambda_for[5];     ///< last lambda for a specific pict type
 
+    int header_bits;
+
     /* bit rate control */
     int64_t total_bits;
     int frame_bits;                ///< bits used for the current frame
diff --git a/libavcodec/ratecontrol.c b/libavcodec/ratecontrol.c
index 03466a1a43..c41682b29c 100644
--- a/libavcodec/ratecontrol.c
+++ b/libavcodec/ratecontrol.c
@@ -54,7 +54,7 @@ void ff_write_pass1_stats(MPVMainEncContext *m)
              s->current_picture.mc_mb_var_sum,
              s->current_picture.mb_var_sum,
              s->i_count, s->skip_count,
-             s->header_bits);
+             m->header_bits);
 }
 
 static double get_fps(AVCodecContext *avctx)
-- 
2.32.0

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