*/
#define BITSTREAM_READER_LE
-//#define DEBUG
#include <limits.h>
#include "avcodec.h"
#include "get_bits.h"
+#include "internal.h"
+#include "libavutil/crc.h"
#define FORMAT_SIMPLE 1
#define FORMAT_ENCRYPTED 2
#define MAX_ORDER 16
typedef struct TTAFilter {
- int32_t shift, round, error, mode;
+ int32_t shift, round, error;
int32_t qm[MAX_ORDER];
int32_t dx[MAX_ORDER];
int32_t dl[MAX_ORDER];
typedef struct TTAContext {
AVCodecContext *avctx;
- AVFrame frame;
GetBitContext gb;
+ const AVCRC *crc_table;
- int format, channels, bps, data_length;
- int frame_length, last_frame_length, total_frames;
+ int format, channels, bps;
+ unsigned data_length;
+ int frame_length, last_frame_length;
int32_t *decode_buffer;
static const uint32_t * const shift_16 = shift_1 + 4;
-static const int32_t ttafilter_configs[4][2] = {
- {10, 1},
- {9, 1},
- {10, 1},
- {12, 0}
+static const int32_t ttafilter_configs[4] = {
+ 10,
+ 9,
+ 10,
+ 12
};
-static void ttafilter_init(TTAFilter *c, int32_t shift, int32_t mode) {
+static void ttafilter_init(TTAFilter *c, int32_t shift) {
memset(c, 0, sizeof(TTAFilter));
c->shift = shift;
c->round = shift_1[shift-1];
// c->round = 1 << (shift - 1);
- c->mode = mode;
}
// FIXME: copy paste from original
*a = *b;
}
-// FIXME: copy paste from original
-// mode=1 encoder, mode=0 decoder
-static inline void ttafilter_process(TTAFilter *c, int32_t *in, int32_t mode) {
+static inline void ttafilter_process(TTAFilter *c, int32_t *in)
+{
register int32_t *dl = c->dl, *qm = c->qm, *dx = c->dx, sum = c->round;
if (!c->error) {
*(dx-2) = ((*(dl-3) >> 30) | 1) << 1;
*(dx-3) = ((*(dl-4) >> 30) | 1);
- // compress
- if (mode) {
- *dl = *in;
- *in -= (sum >> c->shift);
- c->error = *in;
- } else {
- c->error = *in;
- *in += (sum >> c->shift);
- *dl = *in;
- }
+ c->error = *in;
+ *in += (sum >> c->shift);
+ *dl = *in;
- if (c->mode) {
- *(dl-1) = *dl - *(dl-1);
- *(dl-2) = *(dl-1) - *(dl-2);
- *(dl-3) = *(dl-2) - *(dl-3);
- }
+ *(dl-1) = *dl - *(dl-1);
+ *(dl-2) = *(dl-1) - *(dl-2);
+ *(dl-3) = *(dl-2) - *(dl-3);
memshl(c->dl, c->dl + 1);
memshl(c->dx, c->dx + 1);
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;
+ int total_frames;
s->avctx = avctx;
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);
+ tta_check_crc(s, avctx->extradata, 18);
+ }
+
/* signature */
skip_bits_long(&s->gb, 32);
return -1;
}
if (s->format == FORMAT_ENCRYPTED) {
- av_log_missing_feature(s->avctx, "Encrypted TTA", 0);
- return AVERROR(EINVAL);
+ avpriv_report_missing_feature(s->avctx, "Encrypted TTA");
+ return AVERROR_PATCHWELCOME;
}
avctx->channels = s->channels = get_bits(&s->gb, 16);
avctx->bits_per_coded_sample = get_bits(&s->gb, 16);
if (s->channels == 0) {
av_log(s->avctx, AV_LOG_ERROR, "Invalid number of channels\n");
return AVERROR_INVALIDDATA;
+ } else if (avctx->sample_rate == 0) {
+ av_log(s->avctx, AV_LOG_ERROR, "Invalid samplerate\n");
+ return AVERROR_INVALIDDATA;
}
switch(s->bps) {
}
// prevent overflow
- if (avctx->sample_rate > 0x7FFFFF) {
+ if (avctx->sample_rate > 0x7FFFFFu) {
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 +
- (s->last_frame_length ? 1 : 0);
+ total_frames = s->data_length / s->frame_length +
+ (s->last_frame_length ? 1 : 0);
av_log(s->avctx, AV_LOG_DEBUG, "format: %d chans: %d bps: %d rate: %d block: %d\n",
s->format, avctx->channels, avctx->bits_per_coded_sample, avctx->sample_rate,
avctx->block_align);
av_log(s->avctx, AV_LOG_DEBUG, "data_length: %d frame_length: %d last: %d total: %d\n",
- s->data_length, s->frame_length, s->last_frame_length, s->total_frames);
+ s->data_length, s->frame_length, s->last_frame_length, total_frames);
// FIXME: seek table
- skip_bits_long(&s->gb, 32 * s->total_frames);
+ if (avctx->extradata_size <= 26 || total_frames > INT_MAX / 4 ||
+ avctx->extradata_size - 26 < total_frames * 4)
+ av_log(avctx, AV_LOG_WARNING, "Seek table missing or too small\n");
+ else if (avctx->err_recognition & AV_EF_CRCCHECK) {
+ int ret = tta_check_crc(s, avctx->extradata + 22, total_frames * 4);
+ if (ret < 0 && avctx->err_recognition & AV_EF_EXPLODE)
+ return AVERROR_INVALIDDATA;
+ }
+ skip_bits_long(&s->gb, 32 * total_frames);
skip_bits_long(&s->gb, 32); // CRC32 of seektable
if(s->frame_length >= UINT_MAX / (s->channels * sizeof(int32_t))){
return -1;
}
- avcodec_get_frame_defaults(&s->frame);
- avctx->coded_frame = &s->frame;
-
return 0;
}
static int tta_decode_frame(AVCodecContext *avctx, void *data,
int *got_frame_ptr, AVPacket *avpkt)
{
+ AVFrame *frame = data;
const uint8_t *buf = avpkt->data;
int buf_size = avpkt->size;
TTAContext *s = avctx->priv_data;
int cur_chan = 0, framelen = s->frame_length;
int32_t *p;
- init_get_bits(&s->gb, buf, buf_size*8);
+ if (avctx->err_recognition & AV_EF_CRCCHECK) {
+ if (buf_size < 4 ||
+ (tta_check_crc(s, buf, buf_size - 4) && avctx->err_recognition & AV_EF_EXPLODE))
+ return AVERROR_INVALIDDATA;
+ }
- // FIXME: seeking
- s->total_frames--;
- if (!s->total_frames && s->last_frame_length)
- framelen = s->last_frame_length;
+ init_get_bits(&s->gb, buf, buf_size*8);
/* get output buffer */
- s->frame.nb_samples = framelen;
- if ((ret = avctx->get_buffer(avctx, &s->frame)) < 0) {
+ frame->nb_samples = framelen;
+ if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) {
av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
return ret;
}
// decode directly to output buffer for 24-bit sample format
if (s->bps == 3)
- s->decode_buffer = (int32_t *)s->frame.data[0];
+ s->decode_buffer = (int32_t *)frame->data[0];
// init per channel states
for (i = 0; i < s->channels; i++) {
s->ch_ctx[i].predictor = 0;
- ttafilter_init(&s->ch_ctx[i].filter, ttafilter_configs[s->bps-1][0], ttafilter_configs[s->bps-1][1]);
+ ttafilter_init(&s->ch_ctx[i].filter, ttafilter_configs[s->bps-1]);
rice_init(&s->ch_ctx[i].rice, 10, 10);
}
+ i = 0;
for (p = s->decode_buffer; p < s->decode_buffer + (framelen * s->channels); p++) {
int32_t *predictor = &s->ch_ctx[cur_chan].predictor;
TTAFilter *filter = &s->ch_ctx[cur_chan].filter;
}
// extract coded value
-#define UNFOLD(x) (((x)&1) ? (++(x)>>1) : (-(x)>>1))
- *p = UNFOLD(value);
+ *p = 1 + ((value >> 1) ^ ((value & 1) - 1));
// run hybrid filter
- ttafilter_process(filter, p, 0);
+ ttafilter_process(filter, p);
// fixed order prediction
#define PRED(x, k) (int32_t)((((uint64_t)x << k) - x) >> k)
switch (s->bps) {
- case 1: *p += PRED(*predictor, 4); break;
- case 2:
- case 3: *p += PRED(*predictor, 5); break;
- case 4: *p += *predictor; break;
+ case 1: *p += PRED(*predictor, 4); break;
+ case 2:
+ case 3: *p += PRED(*predictor, 5); break;
+ case 4: *p += *predictor; break;
}
*predictor = *p;
if (cur_chan < (s->channels-1))
cur_chan++;
else {
- // decorrelate in case of stereo integer
+ // decorrelate in case of multiple channels
if (s->channels > 1) {
int32_t *r = p - 1;
for (*p += *r / 2; r > p - s->channels; r--)
*r = *(r + 1) - *r;
}
cur_chan = 0;
+ i++;
+ // check for last frame
+ if (i == s->last_frame_length && get_bits_left(&s->gb) / 8 == 4) {
+ frame->nb_samples = framelen = s->last_frame_length;
+ break;
+ }
}
}
+ align_get_bits(&s->gb);
if (get_bits_left(&s->gb) < 32) {
ret = AVERROR_INVALIDDATA;
goto error;
// convert to output buffer
if (s->bps == 2) {
- int16_t *samples = (int16_t *)s->frame.data[0];
+ int16_t *samples = (int16_t *)frame->data[0];
for (p = s->decode_buffer; p < s->decode_buffer + (framelen * s->channels); p++)
*samples++ = *p;
} else {
// shift samples for 24-bit sample format
- int32_t *samples = (int32_t *)s->frame.data[0];
+ int32_t *samples = (int32_t *)frame->data[0];
for (i = 0; i < framelen * s->channels; i++)
*samples++ <<= 8;
// reset decode buffer
s->decode_buffer = NULL;
}
- *got_frame_ptr = 1;
- *(AVFrame *)data = s->frame;
+ *got_frame_ptr = 1;
return buf_size;
error:
AVCodec ff_tta_decoder = {
.name = "tta",
+ .long_name = NULL_IF_CONFIG_SMALL("TTA (True Audio)"),
.type = AVMEDIA_TYPE_AUDIO,
- .id = CODEC_ID_TTA,
+ .id = AV_CODEC_ID_TTA,
.priv_data_size = sizeof(TTAContext),
.init = tta_decode_init,
.close = tta_decode_close,
.decode = tta_decode_frame,
- .capabilities = CODEC_CAP_DR1,
- .long_name = NULL_IF_CONFIG_SMALL("True Audio (TTA)"),
+ .capabilities = AV_CODEC_CAP_DR1,
};
projects / ffmpeg / blobdiff