diff options
| author | Nick Renieris <velocityra@gmail.com> | 2019-05-30 13:42:40 +0300 |
|---|---|---|
| committer | Paul B Mahol <onemda@gmail.com> | 2019-05-30 19:27:05 +0200 |
| commit | a7e018b05e0ec99a466b20c797785620645e5d3a (patch) | |
| tree | e38b0de1a1b14d447ddb491c4bae83fea5ab8f1f /libavcodec/tiff.c | |
| parent | 6895b350c31d8fda5bd9e4285c52de6e391e7ff4 (diff) | |
avcodec/tiff: Option to decode embedded thumbnail
Adds the "-thumbnail" option, that works like the current "-subifd"
option, but only for non-full-sized images.
This is particularly useful for DNG images (see next commit) that
have SubIFDs that are not necessarily thumbnails.
Signed-off-by: Nick Renieris <velocityra@gmail.com>
Diffstat (limited to 'libavcodec/tiff.c')
| -rw-r--r-- | libavcodec/tiff.c | 17 |
1 files changed, 14 insertions, 3 deletions
diff --git a/libavcodec/tiff.c b/libavcodec/tiff.c index 79e6242549..6e15d00310 100644 --- a/libavcodec/tiff.c +++ b/libavcodec/tiff.c @@ -56,6 +56,7 @@ typedef struct TiffContext { int get_subimage; uint16_t get_page; + int get_thumbnail; int width, height; unsigned int bpp, bppcount; @@ -70,6 +71,7 @@ typedef struct TiffContext { int predictor; int fill_order; uint32_t res[4]; + int is_thumbnail; int is_bayer; uint8_t pattern[4]; @@ -948,6 +950,8 @@ static int tiff_decode_tag(TiffContext *s, AVFrame *frame) } switch (tag) { + case TIFF_SUBFILE: + s->is_thumbnail = (value != 0); case TIFF_WIDTH: s->width = value; break; @@ -1387,6 +1391,7 @@ static int decode_frame(AVCodecContext *avctx, s->le = le; // TIFF_BPP is not a required tag and defaults to 1 again: + s->is_thumbnail = 0; s->bppcount = s->bpp = 1; s->photometric = TIFF_PHOTOMETRIC_NONE; s->compr = TIFF_RAW; @@ -1408,9 +1413,14 @@ again: return ret; } - /** whether we should look for this IFD's SubIFD */ - retry_for_subifd = s->sub_ifd && s->get_subimage; - /** whether we should look for this multi-page IFD's next page */ + if (s->get_thumbnail && !s->is_thumbnail) { + av_log(avctx, AV_LOG_INFO, "No embedded thumbnail present\n"); + return AVERROR_EOF; + } + + /** whether we should process this IFD's SubIFD */ + retry_for_subifd = s->sub_ifd && (s->get_subimage || (!s->get_thumbnail && s->is_thumbnail)); + /** whether we should process this multi-page IFD's next page */ retry_for_page = s->get_page && s->cur_page + 1 < s->get_page; // get_page is 1-indexed if (retry_for_page) { @@ -1670,6 +1680,7 @@ static av_cold int tiff_end(AVCodecContext *avctx) #define OFFSET(x) offsetof(TiffContext, x) static const AVOption tiff_options[] = { { "subimage", "decode subimage instead if available", OFFSET(get_subimage), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, AV_OPT_FLAG_DECODING_PARAM | AV_OPT_FLAG_VIDEO_PARAM }, + { "thumbnail", "decode embedded thumbnail subimage instead if available", OFFSET(get_thumbnail), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, AV_OPT_FLAG_DECODING_PARAM | AV_OPT_FLAG_VIDEO_PARAM }, { "page", "page number of multi-page image to decode (starting from 1)", OFFSET(get_page), AV_OPT_TYPE_INT, {.i64=0}, 0, UINT16_MAX, AV_OPT_FLAG_DECODING_PARAM | AV_OPT_FLAG_VIDEO_PARAM }, { NULL }, }; |