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avcodec/tiff: Don't use separate temporary buffer for fax

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Also don't unnecessarily copy the input data around if it needn't be
reversed; and remove a redundant memset -- av_fast_padded_malloc()
already does this for us.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
This commit is contained in:
Andreas Rheinhardt 2021-03-30 08:26:43 +02:00
parent f0042e573e
commit b0cd60bd97
1 changed files with 6 additions and 22 deletions
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28
libavcodec/tiff.c
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@ -108,8 +108,6 @@ typedef struct TiffContext {
int deinvert_buf_size;
uint8_t *yuv_line;
unsigned int yuv_line_size;
uint8_t *fax_buffer;
unsigned int fax_buffer_size;
int geotag_count;
TiffGeoTag *geotags;
@ -615,27 +613,15 @@ static int tiff_unpack_lzma(TiffContext *s, AVFrame *p, uint8_t *dst, int stride
static int tiff_unpack_fax(TiffContext *s, uint8_t *dst, int stride,
const uint8_t *src, int size, int width, int lines)
{
int i, ret = 0;
int line;
uint8_t *src2;
int ret;
av_fast_padded_malloc(&s->fax_buffer, &s->fax_buffer_size, size);
src2 = s->fax_buffer;
if (!src2) {
av_log(s->avctx, AV_LOG_ERROR,
"Error allocating temporary buffer\n");
return AVERROR(ENOMEM);
if (s->fill_order) {
if ((ret = deinvert_buffer(s, src, size)) < 0)
return ret;
src = s->deinvert_buf;
}
if (!s->fill_order) {
memcpy(src2, src, size);
} else {
for (i = 0; i < size; i++)
src2[i] = ff_reverse[src[i]];
}
memset(src2 + size, 0, AV_INPUT_BUFFER_PADDING_SIZE);
ret = ff_ccitt_unpack(s->avctx, src2, size, dst, lines, stride,
ret = ff_ccitt_unpack(s->avctx, src, size, dst, lines, stride,
s->compr, s->fax_opts);
if (s->bpp < 8 && s->avctx->pix_fmt == AV_PIX_FMT_PAL8)
for (line = 0; line < lines; line++) {
@ -2188,8 +2174,6 @@ static av_cold int tiff_end(AVCodecContext *avctx)
s->deinvert_buf_size = 0;
av_freep(&s->yuv_line);
s->yuv_line_size = 0;
av_freep(&s->fax_buffer);
s->fax_buffer_size = 0;
av_frame_free(&s->jpgframe);
av_packet_free(&s->jpkt);
avcodec_free_context(&s->avctx_mjpeg);