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avcodec/exr: recreate offset table outside of packet

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Packet might not be writable at this point.
This commit is contained in:
Paul B Mahol 2022-09-17 11:21:27 +02:00
parent f80e5815c0
commit 7c60badbed
1 changed files with 11 additions and 3 deletions
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14
libavcodec/exr.c
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@ -191,6 +191,8 @@ typedef struct EXRContext {
float gamma;
union av_intfloat32 gamma_table[65536];
uint8_t *offset_table;
Half2FloatTables h2f_tables;
} EXRContext;
@ -2026,7 +2028,6 @@ static int decode_frame(AVCodecContext *avctx, AVFrame *picture,
int nb_blocks; /* nb scanline or nb tile */
uint64_t start_offset_table;
uint64_t start_next_scanline;
PutByteContext offset_table_writer;
bytestream2_init(gb, avpkt->data, avpkt->size);
@ -2146,11 +2147,17 @@ static int decode_frame(AVCodecContext *avctx, AVFrame *picture,
// check offset table and recreate it if need
if (!s->is_tile && bytestream2_peek_le64(gb) == 0) {
PutByteContext offset_table_writer;
av_log(s->avctx, AV_LOG_DEBUG, "recreating invalid scanline offset table\n");
s->offset_table = av_realloc_f(s->offset_table, nb_blocks, 8);
if (!s->offset_table)
return AVERROR(ENOMEM);
start_offset_table = bytestream2_tell(gb);
start_next_scanline = start_offset_table + nb_blocks * 8;
bytestream2_init_writer(&offset_table_writer, &avpkt->data[start_offset_table], nb_blocks * 8);
bytestream2_init_writer(&offset_table_writer, s->offset_table, nb_blocks * 8);
for (y = 0; y < nb_blocks; y++) {
/* write offset of prev scanline in offset table */
@ -2160,7 +2167,7 @@ static int decode_frame(AVCodecContext *avctx, AVFrame *picture,
bytestream2_seek(gb, start_next_scanline + 4, SEEK_SET);/* skip line number */
start_next_scanline += (bytestream2_get_le32(gb) + 8);
}
bytestream2_seek(gb, start_offset_table, SEEK_SET);
bytestream2_init(gb, s->offset_table, nb_blocks * 8);
}
// save pointer we are going to use in decode_block
@ -2270,6 +2277,7 @@ static av_cold int decode_end(AVCodecContext *avctx)
av_freep(&s->thread_data);
av_freep(&s->channels);
av_freep(&s->offset_table);
return 0;
}