diff options
Diffstat (limited to 'drivers/media/v4l2-core/v4l2-jpeg.c')
| -rw-r--r-- | drivers/media/v4l2-core/v4l2-jpeg.c | 42 |
1 files changed, 41 insertions, 1 deletions
diff --git a/drivers/media/v4l2-core/v4l2-jpeg.c b/drivers/media/v4l2-core/v4l2-jpeg.c index 9071b6cc6d0e..ede40f2a5456 100644 --- a/drivers/media/v4l2-core/v4l2-jpeg.c +++ b/drivers/media/v4l2-core/v4l2-jpeg.c @@ -45,6 +45,7 @@ MODULE_LICENSE("GPL"); #define DHP 0xffde /* hierarchical progression */ #define EXP 0xffdf /* expand reference */ #define APP0 0xffe0 /* application data */ +#define APP14 0xffee /* application data for colour encoding */ #define APP15 0xffef #define JPG0 0xfff0 /* extensions */ #define JPG13 0xfffd @@ -444,6 +445,39 @@ static int jpeg_skip_segment(struct jpeg_stream *stream) return jpeg_skip(stream, len - 2); } +/* Rec. ITU-T T.872 (06/2012) 6.5.3 */ +static int jpeg_parse_app14_data(struct jpeg_stream *stream, + enum v4l2_jpeg_app14_tf *tf) +{ + int ret; + int lp; + int skip; + + lp = jpeg_get_word_be(stream); + if (lp < 0) + return lp; + + /* Check for "Adobe\0" in Ap1..6 */ + if (stream->curr + 6 > stream->end || + strncmp(stream->curr, "Adobe\0", 6)) + return -EINVAL; + + /* get to Ap12 */ + ret = jpeg_skip(stream, 11); + if (ret < 0) + return ret; + + ret = jpeg_get_byte(stream); + if (ret < 0) + return ret; + + *tf = ret; + + /* skip the rest of the segment, this ensures at least it is complete */ + skip = lp - 2 - 11; + return jpeg_skip(stream, skip); +} + /** * v4l2_jpeg_parse_header - locate marker segments and optionally parse headers * @buf: address of the JPEG buffer, should start with a SOI marker @@ -476,6 +510,9 @@ int v4l2_jpeg_parse_header(void *buf, size_t len, struct v4l2_jpeg_header *out) if (marker != SOI) return -EINVAL; + /* init value to signal if this marker is not present */ + out->app14_tf = V4L2_JPEG_APP14_TF_UNKNOWN; + /* loop through marker segments */ while ((marker = jpeg_next_marker(&stream)) >= 0) { switch (marker) { @@ -519,7 +556,10 @@ int v4l2_jpeg_parse_header(void *buf, size_t len, struct v4l2_jpeg_header *out) ret = jpeg_parse_restart_interval(&stream, &out->restart_interval); break; - + case APP14: + ret = jpeg_parse_app14_data(&stream, + &out->app14_tf); + break; case SOS: ret = jpeg_reference_segment(&stream, &out->sos); if (ret < 0) |