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alsdec: update checked AV_EF flags.

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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@gmx.at>
This commit is contained in:
Michael Niedermayer 2011-11-19 20:41:30 +01:00
parent 2c44aed82a
commit 919c00ba5a
1 changed files with 3 additions and 3 deletions
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6
libavcodec/alsdec.c
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@ -393,7 +393,7 @@ static av_cold int read_specific_config(ALSDecContext *ctx)
if (get_bits_left(&gb) < 32)
return -1;
if (avctx->err_recognition & AV_EF_CRCCHECK) {
if (avctx->err_recognition & (AV_EF_CRCCHECK|AV_EF_CAREFUL)) {
ctx->crc_table = av_crc_get_table(AV_CRC_32_IEEE_LE);
ctx->crc = 0xFFFFFFFF;
ctx->crc_org = ~get_bits_long(&gb, 32);
@ -1476,7 +1476,7 @@ static int decode_frame(AVCodecContext *avctx,
}
// update CRC
if (sconf->crc_enabled && (avctx->err_recognition & AV_EF_CRCCHECK)) {
if (sconf->crc_enabled && (avctx->err_recognition & (AV_EF_CRCCHECK|AV_EF_CAREFUL))) {
int swap = HAVE_BIGENDIAN != sconf->msb_first;
if (ctx->avctx->bits_per_raw_sample == 24) {
@ -1710,7 +1710,7 @@ static av_cold int decode_init(AVCodecContext *avctx)
// allocate crc buffer
if (HAVE_BIGENDIAN != sconf->msb_first && sconf->crc_enabled &&
(avctx->err_recognition & AV_EF_CRCCHECK)) {
(avctx->err_recognition & (AV_EF_CRCCHECK|AV_EF_CAREFUL))) {
ctx->crc_buffer = av_malloc(sizeof(*ctx->crc_buffer) *
ctx->cur_frame_length *
avctx->channels *