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Code Issues Releases Activity

avcodec/hcadec: add a flush callback

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Fixes unexpected behavior during seeking and with fuzzed samples.

Signed-off-by: James Almer <jamrial@gmail.com>
This commit is contained in:
James Almer 2023-10-04 15:40:10 -03:00
parent 19baf4e009
commit 9078dc0c52
1 changed files with 17 additions and 1 deletions
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18
libavcodec/hcadec.c
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@ -65,6 +65,7 @@ typedef struct HCAContext {
uint8_t stereo_band_count;
uint8_t bands_per_hfr_group;
// Set during init() and freed on close(). Untouched on flush()
av_tx_fn tx_fn;
AVTXContext *tx_ctx;
AVFloatDSPContext *fdsp;
@ -196,6 +197,13 @@ static inline unsigned ceil2(unsigned a, unsigned b)
return (b > 0) ? (a / b + ((a % b) ? 1 : 0)) : 0;
}
static av_cold void decode_flush(AVCodecContext *avctx)
{
HCAContext *c = avctx->priv_data;
memset(c, 0, offsetof(HCAContext, tx_fn));
}
static int init_hca(AVCodecContext *avctx, const uint8_t *extradata,
const int extradata_size)
{
@ -205,6 +213,8 @@ static int init_hca(AVCodecContext *avctx, const uint8_t *extradata,
unsigned b, chunk;
int version, ret;
decode_flush(avctx);
if (extradata_size < 36)
return AVERROR_INVALIDDATA;
@ -340,6 +350,9 @@ static int init_hca(AVCodecContext *avctx, const uint8_t *extradata,
return AVERROR_INVALIDDATA;
}
// Done last to signal init() finished
c->crc_table = av_crc_get_table(AV_CRC_16_ANSI);
return 0;
}
@ -350,7 +363,6 @@ static av_cold int decode_init(AVCodecContext *avctx)
int ret;
avctx->sample_fmt = AV_SAMPLE_FMT_FLTP;
c->crc_table = av_crc_get_table(AV_CRC_16_ANSI);
if (avctx->ch_layout.nb_channels <= 0 || avctx->ch_layout.nb_channels > FF_ARRAY_ELEMS(c->ch))
return AVERROR(EINVAL);
@ -534,6 +546,9 @@ static int decode_frame(AVCodecContext *avctx, AVFrame *frame,
}
}
if (!c->crc_table)
return AVERROR_INVALIDDATA;
if (c->key || c->subkey) {
uint8_t *data, *cipher = c->cipher;
@ -602,6 +617,7 @@ const FFCodec ff_hca_decoder = {
.priv_data_size = sizeof(HCAContext),
.init = decode_init,
FF_CODEC_DECODE_CB(decode_frame),
.flush = decode_flush,
.close = decode_close,
.p.capabilities = AV_CODEC_CAP_DR1,
.caps_internal = FF_CODEC_CAP_INIT_CLEANUP,