#include <limits.h>
#include "avcodec.h"
#include "get_bits.h"
+#include "libavutil/crc.h"
#define FORMAT_SIMPLE 1
#define FORMAT_ENCRYPTED 2
AVCodecContext *avctx;
AVFrame frame;
GetBitContext gb;
+ const AVCRC *crc_table;
int format, channels, bps, data_length;
int frame_length, last_frame_length, total_frames;
return ret;
}
+static int tta_check_crc(TTAContext *s, const uint8_t *buf, int buf_size)
+{
+ uint32_t crc, CRC;
+
+ CRC = AV_RL32(buf + buf_size);
+ crc = av_crc(s->crc_table, 0xFFFFFFFFU, buf, buf_size);
+ if (CRC != (crc ^ 0xFFFFFFFFU)) {
+ av_log(s->avctx, AV_LOG_ERROR, "CRC error\n");
+ return AVERROR_INVALIDDATA;
+ }
+
+ return 0;
+}
+
static av_cold int tta_decode_init(AVCodecContext * avctx)
{
TTAContext *s = avctx->priv_data;
init_get_bits(&s->gb, avctx->extradata, avctx->extradata_size * 8);
if (show_bits_long(&s->gb, 32) == AV_RL32("TTA1"))
{
+ if (avctx->err_recognition & AV_EF_CRCCHECK) {
+ s->crc_table = av_crc_get_table(AV_CRC_32_IEEE_LE);
+ if (tta_check_crc(s, avctx->extradata, 18))
+ return AVERROR_INVALIDDATA;
+ }
+
/* signature */
skip_bits_long(&s->gb, 32);
s->data_length, s->frame_length, s->last_frame_length, s->total_frames);
// FIXME: seek table
+ if (get_bits_left(&s->gb) < 32 * s->total_frames + 32)
+ av_log(avctx, AV_LOG_WARNING, "Seek table missing or too small\n");
+ else if (avctx->err_recognition & AV_EF_CRCCHECK) {
+ if (tta_check_crc(s, avctx->extradata + 22, s->total_frames * 4))
+ return AVERROR_INVALIDDATA;
+ }
skip_bits_long(&s->gb, 32 * s->total_frames);
skip_bits_long(&s->gb, 32); // CRC32 of seektable
int cur_chan = 0, framelen = s->frame_length;
int32_t *p;
+ if (avctx->err_recognition & AV_EF_CRCCHECK) {
+ if (buf_size < 4 || tta_check_crc(s, buf, buf_size - 4))
+ return AVERROR_INVALIDDATA;
+ }
+
init_get_bits(&s->gb, buf, buf_size*8);
// FIXME: seeking