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avcodec/lscrdec: Don't open and close z_streams unnecessarily

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Instead reuse and reset a single z_stream.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
This commit is contained in:
Andreas Rheinhardt 2022-03-15 13:25:07 +01:00
parent 0d629c390e
commit 7ca99e1f15
2 changed files with 33 additions and 53 deletions
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2
configure vendored
View File

@ -2850,7 +2850,7 @@ jpegls_decoder_select="mjpeg_decoder"
jv_decoder_select="blockdsp"
lagarith_decoder_select="llviddsp"
ljpeg_encoder_select="idctdsp jpegtables"
lscr_decoder_deps="zlib"
lscr_decoder_select="inflate_wrapper"
magicyuv_decoder_select="llviddsp"
magicyuv_encoder_select="llvidencdsp"
mdec_decoder_select="blockdsp bswapdsp idctdsp mpegvideo"

84
libavcodec/lscrdec.c
View File

@ -32,6 +32,7 @@
#include "packet.h"
#include "png.h"
#include "pngdsp.h"
#include "zlib_wrapper.h"
typedef struct LSCRContext {
PNGDSPContext dsp;
@ -52,7 +53,7 @@ typedef struct LSCRContext {
int cur_h;
int y;
z_stream zstream;
FFZStream zstream;
} LSCRContext;
static void handle_row(LSCRContext *s)
@ -71,11 +72,11 @@ static void handle_row(LSCRContext *s)
s->y++;
}
static int decode_idat(LSCRContext *s, int length)
static int decode_idat(LSCRContext *s, z_stream *zstream, int length)
{
int ret;
s->zstream.avail_in = FFMIN(length, bytestream2_get_bytes_left(&s->gb));
s->zstream.next_in = s->gb.buffer;
zstream->avail_in = FFMIN(length, bytestream2_get_bytes_left(&s->gb));
zstream->next_in = s->gb.buffer;
if (length <= 0)
return AVERROR_INVALIDDATA;
@ -83,22 +84,22 @@ static int decode_idat(LSCRContext *s, int length)
bytestream2_skip(&s->gb, length);
/* decode one line if possible */
while (s->zstream.avail_in > 0) {
ret = inflate(&s->zstream, Z_PARTIAL_FLUSH);
while (zstream->avail_in > 0) {
ret = inflate(zstream, Z_PARTIAL_FLUSH);
if (ret != Z_OK && ret != Z_STREAM_END) {
av_log(s->avctx, AV_LOG_ERROR, "inflate returned error %d\n", ret);
return AVERROR_EXTERNAL;
}
if (s->zstream.avail_out == 0) {
if (zstream->avail_out == 0) {
if (s->y < s->cur_h) {
handle_row(s);
}
s->zstream.avail_out = s->crow_size;
s->zstream.next_out = s->crow_buf;
zstream->avail_out = s->crow_size;
zstream->next_out = s->crow_buf;
}
if (ret == Z_STREAM_END && s->zstream.avail_in > 0) {
if (ret == Z_STREAM_END && zstream->avail_in > 0) {
av_log(s->avctx, AV_LOG_WARNING,
"%d undecompressed bytes left in buffer\n", s->zstream.avail_in);
"%d undecompressed bytes left in buffer\n", zstream->avail_in);
return 0;
}
}
@ -131,18 +132,12 @@ static int decode_frame_lscr(AVCodecContext *avctx,
return ret;
for (int b = 0; b < nb_blocks; b++) {
z_stream *const zstream = &s->zstream.zstream;
int x, y, x2, y2, w, h, left;
uint32_t csize, size;
s->zstream.zalloc = ff_png_zalloc;
s->zstream.zfree = ff_png_zfree;
s->zstream.opaque = NULL;
if ((ret = inflateInit(&s->zstream)) != Z_OK) {
av_log(avctx, AV_LOG_ERROR, "inflateInit returned error %d\n", ret);
ret = AVERROR_EXTERNAL;
goto end;
}
if (inflateReset(zstream) != Z_OK)
return AVERROR_EXTERNAL;
bytestream2_seek(gb, 2 + b * 12, SEEK_SET);
@ -154,10 +149,8 @@ static int decode_frame_lscr(AVCodecContext *avctx,
s->cur_h = h = y2-y;
if (w <= 0 || x < 0 || x >= avctx->width || w + x > avctx->width ||
h <= 0 || y < 0 || y >= avctx->height || h + y > avctx->height) {
ret = AVERROR_INVALIDDATA;
goto end;
}
h <= 0 || y < 0 || y >= avctx->height || h + y > avctx->height)
return AVERROR_INVALIDDATA;
size = bytestream2_get_le32(gb);
@ -168,10 +161,8 @@ static int decode_frame_lscr(AVCodecContext *avctx,
bytestream2_seek(gb, 2 + nb_blocks * 12 + offset, SEEK_SET);
csize = bytestream2_get_be32(gb);
if (bytestream2_get_le32(gb) != MKTAG('I', 'D', 'A', 'T')) {
ret = AVERROR_INVALIDDATA;
goto end;
}
if (bytestream2_get_le32(gb) != MKTAG('I', 'D', 'A', 'T'))
return AVERROR_INVALIDDATA;
offset += size;
left = size;
@ -180,40 +171,32 @@ static int decode_frame_lscr(AVCodecContext *avctx,
s->row_size = w * 3;
av_fast_padded_malloc(&s->buffer, &s->buffer_size, s->row_size + 16);
if (!s->buffer) {
ret = AVERROR(ENOMEM);
goto end;
}
if (!s->buffer)
return AVERROR(ENOMEM);
av_fast_padded_malloc(&s->last_row, &s->last_row_size, s->row_size);
if (!s->last_row) {
ret = AVERROR(ENOMEM);
goto end;
}
if (!s->last_row)
return AVERROR(ENOMEM);
s->crow_size = w * 3 + 1;
s->crow_buf = s->buffer + 15;
s->zstream.avail_out = s->crow_size;
s->zstream.next_out = s->crow_buf;
zstream->avail_out = s->crow_size;
zstream->next_out = s->crow_buf;
s->image_buf = frame->data[0] + (avctx->height - y - 1) * frame->linesize[0] + x * 3;
s->image_linesize =-frame->linesize[0];
while (left > 16) {
ret = decode_idat(s, csize);
ret = decode_idat(s, zstream, csize);
if (ret < 0)
goto end;
return ret;
left -= csize + 16;
if (left > 16) {
bytestream2_skip(gb, 4);
csize = bytestream2_get_be32(gb);
if (bytestream2_get_le32(gb) != MKTAG('I', 'D', 'A', 'T')) {
ret = AVERROR_INVALIDDATA;
goto end;
}
if (bytestream2_get_le32(gb) != MKTAG('I', 'D', 'A', 'T'))
return AVERROR_INVALIDDATA;
}
}
inflateEnd(&s->zstream);
}
frame->pict_type = frame->key_frame ? AV_PICTURE_TYPE_I : AV_PICTURE_TYPE_P;
@ -222,11 +205,7 @@ static int decode_frame_lscr(AVCodecContext *avctx,
return ret;
*got_frame = 1;
end:
inflateEnd(&s->zstream);
if (ret < 0)
return ret;
return avpkt->size;
}
@ -237,6 +216,7 @@ static int lscr_decode_close(AVCodecContext *avctx)
av_frame_free(&s->last_picture);
av_freep(&s->buffer);
av_freep(&s->last_row);
ff_inflate_end(&s->zstream);
return 0;
}
@ -255,7 +235,7 @@ static int lscr_decode_init(AVCodecContext *avctx)
ff_pngdsp_init(&s->dsp);
return 0;
return ff_inflate_init(&s->zstream, avctx);
}
static void lscr_decode_flush(AVCodecContext *avctx)
@ -275,5 +255,5 @@ const AVCodec ff_lscr_decoder = {
.decode = decode_frame_lscr,
.flush = lscr_decode_flush,
.capabilities = AV_CODEC_CAP_DR1,
.caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
.caps_internal = FF_CODEC_CAP_INIT_THREADSAFE | FF_CODEC_CAP_INIT_CLEANUP,
};