* @author Alex Beregszaszi
*/
-#define ALT_BITSTREAM_READER_LE
-//#define DEBUG
#include <limits.h>
+
+#include "libavutil/crc.h"
+
+#define BITSTREAM_READER_LE
#include "avcodec.h"
#include "get_bits.h"
+#include "internal.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;
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 i;
+ 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(&s->gb, 32);
+ skip_bits_long(&s->gb, 32);
s->format = get_bits(&s->gb, 16);
if (s->format > 2) {
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);
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
+ skip_bits_long(&s->gb, 32); // CRC32 of header
+
+ 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) {
-// case 1: avctx->sample_fmt = AV_SAMPLE_FMT_U8; break;
- case 2: avctx->sample_fmt = AV_SAMPLE_FMT_S16; break;
-// case 3: avctx->sample_fmt = AV_SAMPLE_FMT_S24; break;
- case 4: avctx->sample_fmt = AV_SAMPLE_FMT_S32; break;
- default:
- av_log_ask_for_sample(s->avctx,
- "Invalid/unsupported sample format.\n");
- return -1;
+ case 2:
+ avctx->sample_fmt = AV_SAMPLE_FMT_S16;
+ avctx->bits_per_raw_sample = 16;
+ break;
+ case 3:
+ avctx->sample_fmt = AV_SAMPLE_FMT_S32;
+ avctx->bits_per_raw_sample = 24;
+ break;
+ default:
+ av_log(avctx, AV_LOG_ERROR, "Invalid/unsupported sample format.\n");
+ 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 > 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
- for (i = 0; i < s->total_frames; i++)
- skip_bits(&s->gb, 32);
- skip_bits(&s->gb, 32); // CRC32 of seektable
+ 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))){
av_log(avctx, AV_LOG_ERROR, "frame_length too large\n");
return -1;
}
- s->decode_buffer = av_mallocz(sizeof(int32_t)*s->frame_length*s->channels);
+ if (s->bps == 2) {
+ s->decode_buffer = av_mallocz(sizeof(int32_t)*s->frame_length*s->channels);
+ if (!s->decode_buffer)
+ return AVERROR(ENOMEM);
+ }
s->ch_ctx = av_malloc(avctx->channels * sizeof(*s->ch_ctx));
- if (!s->ch_ctx)
+ if (!s->ch_ctx) {
+ av_freep(&s->decode_buffer);
return AVERROR(ENOMEM);
+ }
} else {
av_log(avctx, AV_LOG_ERROR, "Wrong extradata present\n");
return -1;
return 0;
}
-static int tta_decode_frame(AVCodecContext *avctx,
- void *data, int *data_size,
- AVPacket *avpkt)
+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 i;
+ int i, ret;
+ 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) && avctx->err_recognition & AV_EF_EXPLODE))
+ return AVERROR_INVALIDDATA;
+ }
init_get_bits(&s->gb, buf, buf_size*8);
- {
- int cur_chan = 0, framelen = s->frame_length;
- int32_t *p;
- if (*data_size < (framelen * s->channels * 2)) {
- av_log(avctx, AV_LOG_ERROR, "Output buffer size is too small.\n");
- return -1;
- }
- // FIXME: seeking
- s->total_frames--;
- if (!s->total_frames && s->last_frame_length)
- framelen = s->last_frame_length;
-
- // 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]);
- rice_init(&s->ch_ctx[i].rice, 10, 10);
+ /* get output buffer */
+ 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 *)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]);
+ 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;
+ TTARice *rice = &s->ch_ctx[cur_chan].rice;
+ uint32_t unary, depth, k;
+ int32_t value;
+
+ unary = tta_get_unary(&s->gb);
+
+ if (unary == 0) {
+ depth = 0;
+ k = rice->k0;
+ } else {
+ depth = 1;
+ k = rice->k1;
+ unary--;
}
- 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;
- TTARice *rice = &s->ch_ctx[cur_chan].rice;
- uint32_t unary, depth, k;
- int32_t value;
-
- unary = tta_get_unary(&s->gb);
-
- if (unary == 0) {
- depth = 0;
- k = rice->k0;
- } else {
- depth = 1;
- k = rice->k1;
- unary--;
- }
+ if (get_bits_left(&s->gb) < k) {
+ ret = AVERROR_INVALIDDATA;
+ goto error;
+ }
- if (get_bits_left(&s->gb) < k)
- return -1;
-
- if (k) {
- if (k > MIN_CACHE_BITS)
- return -1;
- value = (unary << k) + get_bits(&s->gb, k);
- } else
- value = unary;
-
- // FIXME: copy paste from original
- switch (depth) {
- case 1:
- rice->sum1 += value - (rice->sum1 >> 4);
- if (rice->k1 > 0 && rice->sum1 < shift_16[rice->k1])
- rice->k1--;
- else if(rice->sum1 > shift_16[rice->k1 + 1])
- rice->k1++;
- value += shift_1[rice->k0];
- default:
- rice->sum0 += value - (rice->sum0 >> 4);
- if (rice->k0 > 0 && rice->sum0 < shift_16[rice->k0])
- rice->k0--;
- else if(rice->sum0 > shift_16[rice->k0 + 1])
- rice->k0++;
+ if (k) {
+ if (k > MIN_CACHE_BITS) {
+ ret = AVERROR_INVALIDDATA;
+ goto error;
}
+ value = (unary << k) + get_bits(&s->gb, k);
+ } else
+ value = unary;
+
+ // FIXME: copy paste from original
+ switch (depth) {
+ case 1:
+ rice->sum1 += value - (rice->sum1 >> 4);
+ if (rice->k1 > 0 && rice->sum1 < shift_16[rice->k1])
+ rice->k1--;
+ else if(rice->sum1 > shift_16[rice->k1 + 1])
+ rice->k1++;
+ value += shift_1[rice->k0];
+ default:
+ rice->sum0 += value - (rice->sum0 >> 4);
+ if (rice->k0 > 0 && rice->sum0 < shift_16[rice->k0])
+ rice->k0--;
+ else if(rice->sum0 > shift_16[rice->k0 + 1])
+ rice->k0++;
+ }
- // extract coded value
-#define UNFOLD(x) (((x)&1) ? (++(x)>>1) : (-(x)>>1))
- *p = UNFOLD(value);
+ // extract coded value
+ *p = 1 + ((value >> 1) ^ ((value & 1) - 1));
- // run hybrid filter
- ttafilter_process(filter, p, 0);
+ // run hybrid filter
+ ttafilter_process(filter, p);
- // fixed order prediction
+ // 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;
+ switch (s->bps) {
+ case 1: *p += PRED(*predictor, 4); break;
+ case 2:
+ case 3: *p += PRED(*predictor, 5); break;
+ case 4: *p += *predictor; break;
+ }
+ *predictor = *p;
+
+ // flip channels
+ if (cur_chan < (s->channels-1))
+ cur_chan++;
+ else {
+ // 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;
}
- *predictor = *p;
-
- // flip channels
- if (cur_chan < (s->channels-1))
- cur_chan++;
- else {
- // decorrelate in case of stereo integer
- 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;
+ 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;
}
}
+ }
- if (get_bits_left(&s->gb) < 32)
- return -1;
- skip_bits(&s->gb, 32); // frame crc
+ align_get_bits(&s->gb);
+ if (get_bits_left(&s->gb) < 32) {
+ ret = AVERROR_INVALIDDATA;
+ goto error;
+ }
+ skip_bits_long(&s->gb, 32); // frame crc
- // convert to output buffer
- switch(s->bps) {
- case 2: {
- uint16_t *samples = data;
- for (p = s->decode_buffer; p < s->decode_buffer + (framelen * s->channels); p++) {
- *samples++ = *p;
- }
- *data_size = (uint8_t *)samples - (uint8_t *)data;
- break;
- }
- default:
- av_log(s->avctx, AV_LOG_ERROR, "Error, only 16bit samples supported!\n");
- }
+ // convert to output buffer
+ if (s->bps == 2) {
+ 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 *)frame->data[0];
+ for (i = 0; i < framelen * s->channels; i++)
+ *samples++ <<= 8;
+ // reset decode buffer
+ s->decode_buffer = NULL;
}
+ *got_frame_ptr = 1;
+
return buf_size;
+error:
+ // reset decode buffer
+ if (s->bps == 3)
+ s->decode_buffer = NULL;
+ return ret;
}
static av_cold int tta_decode_close(AVCodecContext *avctx) {
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,
- .long_name = NULL_IF_CONFIG_SMALL("True Audio (TTA)"),
+ .capabilities = AV_CODEC_CAP_DR1,
};
projects / ffmpeg / blobdiff