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avcodec/lcldec: Use ff_inflate_init/end(), cleanup generically

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Returns better error messages in case of error and deduplicates
the inflateInit() code and also allows to cleanup generically
in case of errors as it is save to call ff_inflate_end() if
ff_inflate_init() has not been called successfully.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
This commit is contained in:
Andreas Rheinhardt 2022-03-15 12:52:37 +01:00
parent 7fffa718c3
commit 8231080fd3
2 changed files with 18 additions and 27 deletions
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2
configure vendored
View File

@ -2990,7 +2990,7 @@ xma1_decoder_select="wmapro_decoder"
xma2_decoder_select="wmapro_decoder"
ylc_decoder_select="bswapdsp"
zerocodec_decoder_select="inflate_wrapper"
zlib_decoder_deps="zlib"
zlib_decoder_select="inflate_wrapper"
zlib_encoder_deps="zlib"
zmbv_decoder_select="inflate_wrapper"
zmbv_encoder_deps="zlib"

43
libavcodec/lcldec.c
View File

@ -51,6 +51,7 @@
#include "thread.h"
#if CONFIG_ZLIB_DECODER
#include "zlib_wrapper.h"
#include <zlib.h>
#endif
@ -66,7 +67,7 @@ typedef struct LclDecContext {
// Decompression buffer
unsigned char* decomp_buf;
#if CONFIG_ZLIB_DECODER
z_stream zstream;
FFZStream zstream;
#endif
} LclDecContext;
@ -133,26 +134,27 @@ static unsigned int mszh_decomp(const unsigned char * srcptr, int srclen, unsign
static int zlib_decomp(AVCodecContext *avctx, const uint8_t *src, int src_len, int offset, int expected)
{
LclDecContext *c = avctx->priv_data;
int zret = inflateReset(&c->zstream);
z_stream *const zstream = &c->zstream.zstream;
int zret = inflateReset(zstream);
if (zret != Z_OK) {
av_log(avctx, AV_LOG_ERROR, "Inflate reset error: %d\n", zret);
return AVERROR_UNKNOWN;
}
c->zstream.next_in = src;
c->zstream.avail_in = src_len;
c->zstream.next_out = c->decomp_buf + offset;
c->zstream.avail_out = c->decomp_size - offset;
zret = inflate(&c->zstream, Z_FINISH);
zstream->next_in = src;
zstream->avail_in = src_len;
zstream->next_out = c->decomp_buf + offset;
zstream->avail_out = c->decomp_size - offset;
zret = inflate(zstream, Z_FINISH);
if (zret != Z_OK && zret != Z_STREAM_END) {
av_log(avctx, AV_LOG_ERROR, "Inflate error: %d\n", zret);
return AVERROR_UNKNOWN;
}
if (expected != (unsigned int)c->zstream.total_out) {
if (expected != (unsigned int)zstream->total_out) {
av_log(avctx, AV_LOG_ERROR, "Decoded size differs (%d != %lu)\n",
expected, c->zstream.total_out);
expected, zstream->total_out);
return AVERROR_UNKNOWN;
}
return c->zstream.total_out;
return zstream->total_out;
}
#endif
@ -608,18 +610,8 @@ static av_cold int decode_init(AVCodecContext *avctx)
/* If needed init zlib */
#if CONFIG_ZLIB_DECODER
if (avctx->codec_id == AV_CODEC_ID_ZLIB) {
int zret;
c->zstream.zalloc = Z_NULL;
c->zstream.zfree = Z_NULL;
c->zstream.opaque = Z_NULL;
zret = inflateInit(&c->zstream);
if (zret != Z_OK) {
av_log(avctx, AV_LOG_ERROR, "Inflate init error: %d\n", zret);
av_freep(&c->decomp_buf);
return AVERROR_UNKNOWN;
}
}
if (avctx->codec_id == AV_CODEC_ID_ZLIB)
return ff_inflate_init(&c->zstream, avctx);
#endif
return 0;
@ -631,8 +623,7 @@ static av_cold int decode_end(AVCodecContext *avctx)
av_freep(&c->decomp_buf);
#if CONFIG_ZLIB_DECODER
if (avctx->codec_id == AV_CODEC_ID_ZLIB)
inflateEnd(&c->zstream);
ff_inflate_end(&c->zstream);
#endif
return 0;
@ -649,7 +640,7 @@ const AVCodec ff_mszh_decoder = {
.close = decode_end,
.decode = decode_frame,
.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_FRAME_THREADS,
.caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
.caps_internal = FF_CODEC_CAP_INIT_THREADSAFE | FF_CODEC_CAP_INIT_CLEANUP,
};
#endif
@ -664,6 +655,6 @@ const AVCodec ff_zlib_decoder = {
.close = decode_end,
.decode = decode_frame,
.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_FRAME_THREADS,
.caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
.caps_internal = FF_CODEC_CAP_INIT_THREADSAFE | FF_CODEC_CAP_INIT_CLEANUP,
};
#endif