The EXR decoder cannot handle the image files included in NVidia's HDR SDK. After debugging, I found that the line offset table in the image files contained 0's. Other EXR decoders, including the official OpenEXR decoder, can detect and reconstruct missing line offset tables, so I added some code to do so.
I filed a trac ticket for this issue here: https://trac.ffmpeg.org/ticket/6220. The image files are here: http://samples.ffmpeg.org/ffmpeg-bugs/trac/ticket6220/ Dzung Hoang Signed-off-by: Dzung Hoang <dtho...@yahoo.com> --- libavcodec/exr.c | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+) diff --git a/libavcodec/exr.c b/libavcodec/exr.c index 034920f..dec21af 100644 --- a/libavcodec/exr.c +++ b/libavcodec/exr.c @@ -1726,6 +1726,25 @@ static int decode_frame(AVCodecContext *avctx, void *data, if (bytestream2_get_bytes_left(&s->gb) < nb_blocks * 8) return AVERROR_INVALIDDATA; + // check line offset table and recreate if first entry is 0 + if (bytestream2_peek_le64(&s->gb) == 0) + { + uint64_t *table = (uint64_t *)s->gb.buffer; + uint8_t *head = avpkt->data; + uint8_t *marker = head + bytestream2_tell(&s->gb) + nb_blocks * 8; + + av_log(s->avctx, AV_LOG_INFO, "Recreating invalid offset table.\n"); + + // recreate the line offset table using the length field for each line + // decode_block() will check for out-of-bounds offsets, so do not bother + // to check here + for (y = 0; y < nb_blocks; y++) + { + table[y] = marker - head; + marker += ((uint32_t *)marker)[1] + 8; + } + } + // save pointer we are going to use in decode_block s->buf = avpkt->data; s->buf_size = avpkt->size; -- 2.1.4 _______________________________________________ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-devel
