From 7800cc6e82068c6dfb5af53817f03dfda794c568 Mon Sep 17 00:00:00 2001 From: Andreas Rheinhardt Date: Thu, 8 Oct 2020 17:54:19 +0200 Subject: [PATCH] avcodec/mpeg12: Don't pretend reading dct_dc_size_* VLCs can fail It can't because the corresponding trees don't have any loose ends. Removing the checks also removed an instance of av_log(NULL (with a nonsense message) from the codebase. Reviewed-by: Michael Niedermayer Signed-off-by: Andreas Rheinhardt --- libavcodec/mdec.c | 2 -- libavcodec/mpeg12.h | 4 ---- libavcodec/mpeg12dec.c | 4 ---- 3 files changed, 10 deletions(-) diff --git a/libavcodec/mdec.c b/libavcodec/mdec.c index 7e34ec568e..b16cbb6a79 100644 --- a/libavcodec/mdec.c +++ b/libavcodec/mdec.c @@ -71,8 +71,6 @@ static inline int mdec_decode_block_intra(MDECContext *a, int16_t *block, int n) } else { component = (n <= 3 ? 0 : n - 4 + 1); diff = decode_dc(&a->gb, component); - if (diff >= 0xffff) - return AVERROR_INVALIDDATA; a->last_dc[component] += diff; block[0] = a->last_dc[component] * (1 << 3); } diff --git a/libavcodec/mpeg12.h b/libavcodec/mpeg12.h index 1ec99f17e1..345d473d3a 100644 --- a/libavcodec/mpeg12.h +++ b/libavcodec/mpeg12.h @@ -47,10 +47,6 @@ static inline int decode_dc(GetBitContext *gb, int component) } else { code = get_vlc2(gb, ff_dc_chroma_vlc.table, DC_VLC_BITS, 2); } - if (code < 0){ - av_log(NULL, AV_LOG_ERROR, "invalid dc code at\n"); - return 0xffff; - } if (code == 0) { diff = 0; } else { diff --git a/libavcodec/mpeg12dec.c b/libavcodec/mpeg12dec.c index 1cccfd1742..3be90d7f25 100644 --- a/libavcodec/mpeg12dec.c +++ b/libavcodec/mpeg12dec.c @@ -490,8 +490,6 @@ static inline int mpeg2_decode_block_intra(MpegEncContext *s, component = (n & 1) + 1; } diff = decode_dc(&s->gb, component); - if (diff >= 0xffff) - return AVERROR_INVALIDDATA; dc = s->last_dc[component]; dc += diff; s->last_dc[component] = dc; @@ -577,8 +575,6 @@ static inline int mpeg2_fast_decode_block_intra(MpegEncContext *s, component = (n & 1) + 1; } diff = decode_dc(&s->gb, component); - if (diff >= 0xffff) - return AVERROR_INVALIDDATA; dc = s->last_dc[component]; dc += diff; s->last_dc[component] = dc;