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lavc/pnm_parser: disable parsing for text based PNMs

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P1, P2, and P3 are respectively the text versions of PBM, PGM and PPM
files.

We can not obtain the buffer size using av_imgage_get_buffer_size() as
every pixel in the picture will occupy a random size between 16 and 32
bits ("4 " and "231 " are such example).

Ideally, we could look for the next header (or EOF) in the bytestream,
but this commit is meant to fix a decoding regression introduced by
48ac4532d4.

Fix Ticket #5670
This commit is contained in:
Clément Bœsch 2016-06-27 17:54:22 +02:00
parent 0acc170aad
commit c5566f0a94
1 changed files with 2 additions and 0 deletions
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2
libavcodec/pnm_parser.c
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@ -66,6 +66,8 @@ retry:
} }
#endif #endif
next = END_NOT_FOUND; next = END_NOT_FOUND;
} else if (pnmctx.type < 4) {
next = END_NOT_FOUND;
} else { } else {
next = pnmctx.bytestream - pnmctx.bytestream_start next = pnmctx.bytestream - pnmctx.bytestream_start
+ av_image_get_buffer_size(avctx->pix_fmt, avctx->width, avctx->height, 1); + av_image_get_buffer_size(avctx->pix_fmt, avctx->width, avctx->height, 1);