diff options
| author | Carl Eugen Hoyos <cehoyos@ag.or.at> | 2014-04-07 10:39:55 +0200 |
|---|---|---|
| committer | Carl Eugen Hoyos <cehoyos@ag.or.at> | 2014-04-07 15:30:48 +0200 |
| commit | 993a5afaada4596f6b387d0a2a7cf7ca8170f56d (patch) | |
| tree | 3677582abca2ae9fe509a1e7e4d75e07b4637d3a /libavcodec/tiff.c | |
| parent | 845414bbb122ca022f72729090378a3a06a81144 (diff) | |
| download | ffmpeg-993a5afaada4596f6b387d0a2a7cf7ca8170f56d.tar.gz | |
Read aspect ratio from tiff image files.
Diffstat (limited to 'libavcodec/tiff.c')
| -rw-r--r-- | libavcodec/tiff.c | 21 |
1 files changed, 20 insertions, 1 deletions
diff --git a/libavcodec/tiff.c b/libavcodec/tiff.c index cbc526acc5..e0629dbad8 100644 --- a/libavcodec/tiff.c +++ b/libavcodec/tiff.c @@ -58,6 +58,7 @@ typedef struct TiffContext { int fax_opts; int predictor; int fill_order; + uint32_t res[4]; int strips, rps, sstype; int sot; @@ -566,9 +567,19 @@ static int init_image(TiffContext *s, ThreadFrame *frame) return 0; } +static void set_sar(TiffContext *s, unsigned tag, unsigned num, unsigned den) +{ + int offset = tag == TIFF_YRES ? 2 : 0; + s->res[offset++] = num; + s->res[offset] = den; + if (s->res[0] && s->res[1] && s->res[2] && s->res[3]) + av_reduce(&s->avctx->sample_aspect_ratio.num, &s->avctx->sample_aspect_ratio.den, + s->res[2] * (uint64_t)s->res[1], s->res[0] * (uint64_t)s->res[3], INT32_MAX); +} + static int tiff_decode_tag(TiffContext *s, AVFrame *frame) { - unsigned tag, type, count, off, value = 0; + unsigned tag, type, count, off, value = 0, value2 = 0; int i, j, k, pos, start; int ret; uint32_t *pal; @@ -587,6 +598,10 @@ static int tiff_decode_tag(TiffContext *s, AVFrame *frame) case TIFF_LONG: value = ff_tget(&s->gb, type, s->le); break; + case TIFF_RATIONAL: + value = ff_tget(&s->gb, TIFF_LONG, s->le); + value2 = ff_tget(&s->gb, TIFF_LONG, s->le); + break; case TIFF_STRING: if (count <= 4) { break; @@ -717,6 +732,10 @@ static int tiff_decode_tag(TiffContext *s, AVFrame *frame) return AVERROR_INVALIDDATA; } break; + case TIFF_XRES: + case TIFF_YRES: + set_sar(s, tag, value, value2); + break; case TIFF_TILE_BYTE_COUNTS: case TIFF_TILE_LENGTH: case TIFF_TILE_OFFSETS: |