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tta: use correct frame_length calculation. 

using a floating-point calculation is not necessary.
This commit is contained in:
Justin Ruggles 2011-10-23 16:25:02 -04:00
parent c6056d4004
commit b5050539c9
1 changed files with 6 additions and 7 deletions
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13
libavcodec/tta.c
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@ -217,10 +217,6 @@ static av_cold int tta_decode_init(AVCodecContext * avctx)
avctx->bits_per_coded_sample = get_bits(&s->gb, 16);
s->bps = (avctx->bits_per_coded_sample + 7) / 8;
avctx->sample_rate = get_bits_long(&s->gb, 32);
if(avctx->sample_rate > 1000000){ //prevent FRAME_TIME * avctx->sample_rate from overflowing and sanity check
av_log(avctx, AV_LOG_ERROR, "sample_rate too large\n");
return -1;
}
s->data_length = get_bits_long(&s->gb, 32);
skip_bits(&s->gb, 32); // CRC32 of header
@ -238,9 +234,12 @@ static av_cold int tta_decode_init(AVCodecContext * avctx)
return AVERROR_INVALIDDATA;
}
// FIXME: horribly broken, but directly from reference source
#define FRAME_TIME 1.04489795918367346939
s->frame_length = (int)(FRAME_TIME * avctx->sample_rate);
// prevent overflow
if (avctx->sample_rate > 0x7FFFFF) {
av_log(avctx, AV_LOG_ERROR, "sample_rate too large\n");
return AVERROR(EINVAL);
}
s->frame_length = 256 * avctx->sample_rate / 245;
s->last_frame_length = s->data_length % s->frame_length;
s->total_frames = s->data_length / s->frame_length +