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Don't use expressions with side effects in macro parameters

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AV_WB32 can be implemented as a macro that expands its parameters
multiple times (in case AV_HAVE_FAST_UNALIGNED isn't set and the
compiler doesn't support GCC attributes); make sure not to read
multiple times from the source in this case.

Signed-off-by: Martin Storsjö <martin@martin.st>
This commit is contained in:
Martin Storsjö 2016-07-28 13:10:22 +03:00
parent 7ebdffc353
commit 25bacd0a0c
2 changed files with 16 additions and 8 deletions
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18
libavcodec/dxv.c
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@ -121,8 +121,10 @@ static int dxv_decompress_dxt1(AVCodecContext *avctx)
int pos = 2;
/* Copy the first two elements */
AV_WL32(ctx->tex_data, bytestream2_get_le32(gbc));
AV_WL32(ctx->tex_data + 4, bytestream2_get_le32(gbc));
value = bytestream2_get_le32(gbc);
AV_WL32(ctx->tex_data, value);
value = bytestream2_get_le32(gbc);
AV_WL32(ctx->tex_data + 4, value);
/* Process input until the whole texture has been filled */
while (pos + 2 <= ctx->tex_size / 4) {
@ -172,10 +174,14 @@ static int dxv_decompress_dxt5(AVCodecContext *avctx)
int probe, check;
/* Copy the first four elements */
AV_WL32(ctx->tex_data + 0, bytestream2_get_le32(gbc));
AV_WL32(ctx->tex_data + 4, bytestream2_get_le32(gbc));
AV_WL32(ctx->tex_data + 8, bytestream2_get_le32(gbc));
AV_WL32(ctx->tex_data + 12, bytestream2_get_le32(gbc));
value = bytestream2_get_le32(gbc);
AV_WL32(ctx->tex_data + 0, value);
value = bytestream2_get_le32(gbc);
AV_WL32(ctx->tex_data + 4, value);
value = bytestream2_get_le32(gbc);
AV_WL32(ctx->tex_data + 8, value);
value = bytestream2_get_le32(gbc);
AV_WL32(ctx->tex_data + 12, value);
/* Process input until the whole texture has been filled */
while (pos + 2 <= ctx->tex_size / 4) {

6
libavformat/xmv.c
View File

@ -512,8 +512,10 @@ static int xmv_fetch_video_packet(AVFormatContext *s,
* WMV2 is little-endian.
* TODO: This manual swap is of course suboptimal.
*/
for (i = 0; i < frame_size; i += 4)
AV_WB32(pkt->data + i, avio_rl32(pb));
for (i = 0; i < frame_size; i += 4) {
uint32_t val = avio_rl32(pb);
AV_WB32(pkt->data + i, val);
}
pkt->stream_index = video->stream_index;