From: Andreas Rheinhardt <ffmpegagent-at-gmail.com@ffmpeg.org> To: ffmpeg-devel@ffmpeg.org Cc: Andreas Rheinhardt <andreas.rheinhardt@outlook.com> Subject: [FFmpeg-devel] [PATCH 23/48] avcodec/mpeg4videodec: Avoid unnecessary indirections Date: Mon, 23 Jun 2025 13:36:23 +0000 Message-ID: <45dbfdcfeae89b73d481c858c18eb77cd8f3a607.1750685809.git.ffmpegagent@gmail.com> (raw) In-Reply-To: <pull.102.ffstaging.FFmpeg.1750685808.ffmpegagent@gmail.com> From: Andreas Rheinhardt <andreas.rheinhardt@outlook.com> This basically reverts d4967c04e040b3b2f937cad88599af825147ec94. Said commit was based on the false premise that it would be an aliasing violation to upcast a pointer to structure to a pointer to a bigger structure containing the original structure as its first element, but this is just not true. Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com> --- libavcodec/mpeg4videodec.c | 9 +++------ 1 file changed, 3 insertions(+), 6 deletions(-) diff --git a/libavcodec/mpeg4videodec.c b/libavcodec/mpeg4videodec.c index 34f383bbbd..c61fd23c48 100644 --- a/libavcodec/mpeg4videodec.c +++ b/libavcodec/mpeg4videodec.c @@ -1647,12 +1647,10 @@ not_coded: */ static int mpeg4_decode_partitioned_mb(MpegEncContext *s, int16_t block[6][64]) { - Mpeg4DecContext *ctx = s->avctx->priv_data; + Mpeg4DecContext *const ctx = (Mpeg4DecContext*)s; int cbp, mb_type, use_intra_dc_vlc; const int xy = s->mb_x + s->mb_y * s->mb_stride; - av_assert2(s == (void*)ctx); - mb_type = s->cur_pic.mb_type[xy]; cbp = s->cbp_table[xy]; @@ -1737,13 +1735,12 @@ static int mpeg4_decode_partitioned_mb(MpegEncContext *s, int16_t block[6][64]) static int mpeg4_decode_mb(MpegEncContext *s, int16_t block[6][64]) { - Mpeg4DecContext *ctx = s->avctx->priv_data; + Mpeg4DecContext *const ctx = (Mpeg4DecContext*)s; int cbpc, cbpy, i, cbp, pred_x, pred_y, mx, my, dquant; static const int8_t quant_tab[4] = { -1, -2, 1, 2 }; const int xy = s->mb_x + s->mb_y * s->mb_stride; int next; - av_assert2(s == (void*)ctx); av_assert2(s->h263_pred); if (s->pict_type == AV_PICTURE_TYPE_P || @@ -2153,7 +2150,7 @@ static const uint8_t ac_state_tab[22][2] = static int mpeg4_decode_studio_block(MpegEncContext *s, int32_t block[64], int n) { - Mpeg4DecContext *ctx = s->avctx->priv_data; + Mpeg4DecContext *const ctx = (Mpeg4DecContext*)s; int cc, dct_dc_size, dct_diff, code, j, idx = 1, group = 0, run = 0, additional_code_len, sign, mismatch; -- ffmpeg-codebot _______________________________________________ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-devel To unsubscribe, visit link above, or email ffmpeg-devel-request@ffmpeg.org with subject "unsubscribe".
next prev parent reply other threads:[~2025-06-23 13:41 UTC|newest] Thread overview: 50+ messages / expand[flat|nested] mbox.gz Atom feed top 2025-06-23 13:36 [FFmpeg-devel] [PATCH 00/48] H263DecContext ffmpegagent 2025-06-23 13:36 ` [FFmpeg-devel] [PATCH 01/48] avcodec/ituh263dec: Use correct logcontext Andreas Rheinhardt 2025-06-23 13:36 ` [FFmpeg-devel] [PATCH 02/48] avcodec/rl: Avoid branch in index lookup Andreas Rheinhardt 2025-06-23 13:36 ` [FFmpeg-devel] [PATCH 03/48] avcodec/ituh263enc: Simplify creating LUT Andreas Rheinhardt 2025-06-23 13:36 ` [FFmpeg-devel] [PATCH 04/48] avcodec/ituh263dec: Only initialize ff_h263_rl_inter when needed Andreas Rheinhardt 2025-06-23 13:36 ` [FFmpeg-devel] [PATCH 05/48] avcodec/mpegvideoenc: Allocate blocks as part of MPVEncContext Andreas Rheinhardt 2025-06-23 13:36 ` [FFmpeg-devel] [PATCH 06/48] avcodec/mpegvideo: Add MPVContext typedef Andreas Rheinhardt 2025-06-23 13:36 ` [FFmpeg-devel] [PATCH 07/48] avcodec/mpegvideo_dec: Factor debugging dct coefficients out Andreas Rheinhardt 2025-06-23 13:36 ` [FFmpeg-devel] [PATCH 08/48] avcodec/mpegvideo_dec: Reindent after the previous commit Andreas Rheinhardt 2025-06-23 13:36 ` [FFmpeg-devel] [PATCH 09/48] avcodec/mpeg_er: Don't use MpegEncContext.block Andreas Rheinhardt 2025-06-23 13:36 ` [FFmpeg-devel] [PATCH 10/48] avcodec/mpegvideodec: Remove size expectation from ff_mpv_reconstruct_mb Andreas Rheinhardt 2025-06-23 13:36 ` [FFmpeg-devel] [PATCH 11/48] avcodec/h261dec: Stop using MpegEncContext.gb Andreas Rheinhardt 2025-06-23 13:36 ` [FFmpeg-devel] [PATCH 12/48] avcodec/h261dec: Don't use MpegEncContext.block Andreas Rheinhardt 2025-06-23 13:36 ` [FFmpeg-devel] [PATCH 13/48] avcodec/mpeg12dec: Put GetBitContext on the stack where advantageous Andreas Rheinhardt 2025-06-23 13:36 ` [FFmpeg-devel] [PATCH 14/48] avcodec/mpeg12dec: Remove unused function parameter Andreas Rheinhardt 2025-06-23 13:36 ` [FFmpeg-devel] [PATCH 15/48] avcodec/rv34: Don't use MpegEncContext.gb Andreas Rheinhardt 2025-06-23 13:36 ` [FFmpeg-devel] [PATCH 16/48] avcodec/rv34: Don't use MpegEncContext.block Andreas Rheinhardt 2025-06-23 13:36 ` [FFmpeg-devel] [PATCH 17/48] avcodec/intrax8: Don't pretend to need more than one int16_t[64] Andreas Rheinhardt 2025-06-23 13:36 ` [FFmpeg-devel] [PATCH 18/48] avcodec/vc1: Stop using MpegEncContext.gb Andreas Rheinhardt 2025-06-23 13:36 ` [FFmpeg-devel] [PATCH 19/48] avcodec/vc1: Don't use MpegEncContext.block Andreas Rheinhardt 2025-06-23 13:36 ` [FFmpeg-devel] [PATCH 20/48] avcodec/mpeg12dec: Deduplicate variables Andreas Rheinhardt 2025-06-23 13:36 ` [FFmpeg-devel] [PATCH 21/48] avcodec/mpegvideo: Move flipflop_rounding to {MSMPEG4Dec, MPVEnc}Context Andreas Rheinhardt 2025-06-23 13:36 ` [FFmpeg-devel] [PATCH 22/48] avcodec/mpegvideo: Move unrestricted_mv to MotionEstContext Andreas Rheinhardt 2025-06-23 13:36 ` Andreas Rheinhardt [this message] 2025-06-23 13:36 ` [FFmpeg-devel] [PATCH 24/48] avcodec/{h263, mpeg4video}dec: Pass MPVContext*, not Mpeg4DecContext* Andreas Rheinhardt 2025-06-23 13:36 ` [FFmpeg-devel] [PATCH 25/48] avcodec/mpegvideo: Move dct_precision to Mpeg4DecContext Andreas Rheinhardt 2025-06-23 13:36 ` [FFmpeg-devel] [PATCH 26/48] avcodec/h263dec: Add H263DecContext Andreas Rheinhardt 2025-06-23 13:36 ` [FFmpeg-devel] [PATCH 27/48] avcodec/h263dec: Remove redundant block parameter from decode_mb Andreas Rheinhardt 2025-06-23 13:36 ` [FFmpeg-devel] [PATCH 28/48] avcodec/h263dec: Don't use MpegEncContext.block Andreas Rheinhardt 2025-06-23 13:36 ` [FFmpeg-devel] [PATCH 29/48] avcodec/h263dec: Stop using MpegEncContext.gb Andreas Rheinhardt 2025-06-23 13:36 ` [FFmpeg-devel] [PATCH 30/48] avcodec/mpeg12dec: Add Mpeg12SliceContext Andreas Rheinhardt 2025-06-23 13:36 ` [FFmpeg-devel] [PATCH 31/48] avcodec/mpegvideo: Add missing headers Andreas Rheinhardt 2025-06-23 13:36 ` [FFmpeg-devel] [PATCH 32/48] avcodec/mpeg12dec: Move MpegEncContext.gb to Mpeg12SliceContext Andreas Rheinhardt 2025-06-23 13:36 ` [FFmpeg-devel] [PATCH 33/48] avcodec/mpeg12dec: Don't use MPVContext.block Andreas Rheinhardt 2025-06-23 13:36 ` [FFmpeg-devel] [PATCH 34/48] avcodec/mpegvideo: Move fields only used by H.263 decoders to H263DecCtx Andreas Rheinhardt 2025-06-23 13:36 ` [FFmpeg-devel] [PATCH 35/48] avcodec/mpegvideo: Move mb_num_left to {H263, RV34}DecContext Andreas Rheinhardt 2025-06-23 13:36 ` [FFmpeg-devel] [PATCH 36/48] avcodec/mpeg12dec: Put mb_skip_run on the stack Andreas Rheinhardt 2025-06-23 13:36 ` [FFmpeg-devel] [PATCH 37/48] avcodec/mpegvideo: Move mb_skip_run to {RV34Dec, MPVEnc}Context Andreas Rheinhardt 2025-06-23 13:36 ` [FFmpeg-devel] [PATCH 38/48] avcodec/mpegvideo: Move SLICE_* defs to h263dec.h, h261dec.c Andreas Rheinhardt 2025-06-23 13:36 ` [FFmpeg-devel] [PATCH 39/48] avcodec/msmpeg4dec: Move ff_msmpeg4_decode_init() down Andreas Rheinhardt 2025-06-23 13:36 ` [FFmpeg-devel] [PATCH 40/48] avcodec/h263dec: Use function ptr for decode_picture_header Andreas Rheinhardt 2025-06-23 13:36 ` [FFmpeg-devel] [PATCH 41/48] avcodec/ituh263enc: Inline value of h263_flv Andreas Rheinhardt 2025-06-23 13:36 ` [FFmpeg-devel] [PATCH 42/48] avcodec/flvdec: Binarize h263_flv Andreas Rheinhardt 2025-06-23 13:36 ` [FFmpeg-devel] [PATCH 43/48] avcodec/mpegvideo: Move fields to {H263Dec, MPVEnc}Context when possible Andreas Rheinhardt 2025-06-23 13:36 ` [FFmpeg-devel] [PATCH 44/48] avcodec/mpeg_er: Allow to skip setting partitioned_frame, p[pb]_time Andreas Rheinhardt 2025-06-23 13:36 ` [FFmpeg-devel] [PATCH 45/48] avcodec/mpegvideo: Move partitioned_frame to {H263Dec, MPVEnc}Context Andreas Rheinhardt 2025-06-23 13:36 ` [FFmpeg-devel] [PATCH 46/48] avcodec/mpegvideo: Move loop_filter to {H263Dec, MPVEnc, VC1}Context Andreas Rheinhardt 2025-06-23 13:36 ` [FFmpeg-devel] [PATCH 47/48] avcodec/rv34: Don't report progress unnecessarily Andreas Rheinhardt 2025-06-23 13:36 ` [FFmpeg-devel] [PATCH 48/48] avcodec/rv34: Fix spelling mistake Andreas Rheinhardt 2025-07-03 16:49 ` [FFmpeg-devel] [PATCH 00/48] H263DecContext Andreas Rheinhardt
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