[FFmpeg-devel] [PATCH] avcodec, avfilter, avformat: Remove redundant avpriv_align_put_bits

[Paul B Mahol]

LGTM. I thought flush_put_bits flushes more bits depending on cache size,
but obviously that assumption is incorrect.

On 7/30/20, Andreas Rheinhardt <andreas.rheinhardt at gmail.com> wrote:
> flush_put_bits() already fills the bitstream with zeroes, so it is
> unnecessary to align the bitstream before.
>
> Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt at gmail.com>
> ---
> avpriv_align_put_bits() seems to be a function that should not exist as
> an avpriv function and instead be replaced by an inline function like
> the others or replaced by flush_put_bits().
>
> Notice that even after this patch there are still users of
> avpriv_align_put_bits() outside of libavcodec, because an inline
> function in mpeg4audio.h uses it.
>
>  libavcodec/hevc_ps_enc.c   | 3 +--
>  libavcodec/mpegvideo_enc.c | 1 -
>  libavcodec/vc2enc.c        | 1 -
>  libavcodec/xsubenc.c       | 1 -
>  libavfilter/vf_signature.c | 1 -
>  libavformat/latmenc.c      | 1 -
>  6 files changed, 1 insertion(+), 7 deletions(-)
>
> diff --git a/libavcodec/hevc_ps_enc.c b/libavcodec/hevc_ps_enc.c
> index 78a73a5c0a..5449f81c82 100644
> --- a/libavcodec/hevc_ps_enc.c
> +++ b/libavcodec/hevc_ps_enc.c
> @@ -113,10 +113,9 @@ int ff_hevc_encode_nal_vps(HEVCVPS *vps, unsigned int
> id,
>      put_bits(&pb, 1, 0);    // extension flag
>
>      put_bits(&pb, 1, 1);    // stop bit
> -    avpriv_align_put_bits(&pb);
> +    flush_put_bits(&pb);
>
>      data_size = put_bits_count(&pb) / 8;
> -    flush_put_bits(&pb);
>
>      return data_size;
>  }
> diff --git a/libavcodec/mpegvideo_enc.c b/libavcodec/mpegvideo_enc.c
> index 21c30a9f8a..09697d89c8 100644
> --- a/libavcodec/mpegvideo_enc.c
> +++ b/libavcodec/mpegvideo_enc.c
> @@ -2818,7 +2818,6 @@ static void write_slice_end(MpegEncContext *s){
>          ff_mjpeg_encode_stuffing(s);
>      }
>
> -    avpriv_align_put_bits(&s->pb);
>      flush_put_bits(&s->pb);
>
>      if ((s->avctx->flags & AV_CODEC_FLAG_PASS1) && !s->partitioned_frame)
> diff --git a/libavcodec/vc2enc.c b/libavcodec/vc2enc.c
> index ba5a03e4ec..2efb0f70ad 100644
> --- a/libavcodec/vc2enc.c
> +++ b/libavcodec/vc2enc.c
> @@ -780,7 +780,6 @@ static int encode_slices(VC2EncContext *s)
>      int slice_x, slice_y, skip = 0;
>      SliceArgs *enc_args = s->slice_args;
>
> -    avpriv_align_put_bits(&s->pb);
>      flush_put_bits(&s->pb);
>      buf = put_bits_ptr(&s->pb);
>
> diff --git a/libavcodec/xsubenc.c b/libavcodec/xsubenc.c
> index 4d58e0f3b5..349c1bca3c 100644
> --- a/libavcodec/xsubenc.c
> +++ b/libavcodec/xsubenc.c
> @@ -206,7 +206,6 @@ FF_ENABLE_DEPRECATION_WARNINGS
>      // Enforce total height to be a multiple of 2
>      if (h->rects[0]->h & 1) {
>          put_xsub_rle(&pb, h->rects[0]->w, PADDING_COLOR);
> -        avpriv_align_put_bits(&pb);
>      }
>
>      flush_put_bits(&pb);
> diff --git a/libavfilter/vf_signature.c b/libavfilter/vf_signature.c
> index d07b213f31..5ea55d5247 100644
> --- a/libavfilter/vf_signature.c
> +++ b/libavfilter/vf_signature.c
> @@ -559,7 +559,6 @@ static int binary_export(AVFilterContext *ctx,
> StreamContext *sc, const char* fi
>          }
>      }
>
> -    avpriv_align_put_bits(&buf);
>      flush_put_bits(&buf);
>      fwrite(buffer, 1, put_bits_count(&buf)/8, f);
>      fclose(f);
> diff --git a/libavformat/latmenc.c b/libavformat/latmenc.c
> index 72b7f72f22..5458ce2596 100644
> --- a/libavformat/latmenc.c
> +++ b/libavformat/latmenc.c
> @@ -211,7 +211,6 @@ static int latm_write_packet(AVFormatContext *s,
> AVPacket *pkt)
>      } else
>          avpriv_copy_bits(&bs, pkt->data, 8*pkt->size);
>
> -    avpriv_align_put_bits(&bs);
>      flush_put_bits(&bs);
>
>      len = put_bits_count(&bs) >> 3;
> --
> 2.20.1
>
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