[FFmpeg-devel] [PATCH 1/2] ac3dec: update checked AV_EF flags.

Michael Niedermayer michaelni at gmx.at
Sat Nov 19 21:23:31 CET 2011

A user who wishes to use default error concealment cannot set the
AV_EF_CRCCHECK flag because not every CRC in every format is a
reliable indicator of bitstream damage. In some formats crcrs
can be nonsensical in absence of any damage. We thus add the
AV_EF_CAREFUL flag in addition to the AV_EF_CRCCHECK flag to
allow a user to enable this reliable CRC check without having to
enable all CRC checks in all formats.

Signed-off-by: Michael Niedermayer <michaelni at gmx.at>
 libavcodec/ac3dec.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/libavcodec/ac3dec.c b/libavcodec/ac3dec.c
index 09b9a31..31bd021 100644
--- a/libavcodec/ac3dec.c
+++ b/libavcodec/ac3dec.c
@@ -1359,7 +1359,7 @@ static int ac3_decode_frame(AVCodecContext * avctx, void *data, int *data_size,
         if (s->frame_size > buf_size) {
             av_log(avctx, AV_LOG_ERROR, "incomplete frame\n");
             err = AAC_AC3_PARSE_ERROR_FRAME_SIZE;
-        } else if (avctx->err_recognition & AV_EF_CRCCHECK) {
+        } else if (avctx->err_recognition & (AV_EF_CRCCHECK|AV_EF_CAREFUL)) {
             /* check for crc mismatch */
             if (av_crc(av_crc_get_table(AV_CRC_16_ANSI), 0, &buf[2], s->frame_size-2)) {
                 av_log(avctx, AV_LOG_ERROR, "frame CRC mismatch\n");

More information about the ffmpeg-devel mailing list