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Code Issues Releases Activity

avcodec/speedhq, speedhqenc: Make codecs init-threadsafe

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The SpeedHQ decoder uses and initializes a RLTable's VLC, yet it also
initializes other parts of the RLTable that it does not use. This has
downsides besides being wasteful: Because the SpeedHQ encoder also
initializes these additional fields, there is a potential for data races
(and therefore undefined behaviour). In fact, removing the superfluous
initializations from the decoder automatically makes both the decoder
and the encoder init-threadsafe. This commit does so.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
This commit is contained in:
Andreas Rheinhardt 2020-12-10 08:59:09 +01:00 committed by Andreas Rheinhardt
parent 8ab2bb81b2
commit b05631f7b9
2 changed files with 2 additions and 4 deletions
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4
libavcodec/speedhq.c
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@ -155,8 +155,6 @@ static const uint8_t unscaled_quant_matrix[64] = {
27, 29, 35, 38, 46, 56, 69, 83
};
static uint8_t speedhq_static_rl_table_store[2][2*MAX_RUN + MAX_LEVEL + 3];
static VLC dc_lum_vlc_le;
static VLC dc_chroma_vlc_le;
static VLC dc_alpha_run_vlc_le;
@ -648,7 +646,6 @@ static av_cold void speedhq_static_init(void)
ff_mpeg12_vlc_dc_chroma_code, 2, 2,
INIT_VLC_OUTPUT_LE, 514);
ff_rl_init(&ff_rl_speedhq, speedhq_static_rl_table_store);
INIT_2D_VLC_RL(ff_rl_speedhq, 674, INIT_VLC_LE);
compute_alpha_vlcs();
@ -733,5 +730,6 @@ const AVCodec ff_speedhq_decoder = {
.init = speedhq_decode_init,
.decode = speedhq_decode_frame,
.capabilities = AV_CODEC_CAP_DR1,
.caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
};
#endif /* CONFIG_SPEEDHQ_DECODER */

2
libavcodec/speedhqenc.c
View File

@ -298,7 +298,7 @@ const AVCodec ff_speedhq_encoder = {
.init = ff_mpv_encode_init,
.encode2 = ff_mpv_encode_picture,
.close = ff_mpv_encode_end,
.caps_internal = FF_CODEC_CAP_INIT_CLEANUP,
.caps_internal = FF_CODEC_CAP_INIT_THREADSAFE | FF_CODEC_CAP_INIT_CLEANUP,
.pix_fmts = (const enum AVPixelFormat[]) {
AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV444P,
AV_PIX_FMT_NONE