* @author Alex Beregszaszi
*/
-#define ALT_BITSTREAM_READER_LE
+#define BITSTREAM_READER_LE
//#define DEBUG
#include <limits.h>
#include "avcodec.h"
#include "get_bits.h"
-#define FORMAT_INT 1
-#define FORMAT_FLOAT 3
+#define FORMAT_SIMPLE 1
+#define FORMAT_ENCRYPTED 2
#define MAX_ORDER 16
typedef struct TTAFilter {
typedef struct TTAContext {
AVCodecContext *avctx;
+ AVFrame frame;
GetBitContext gb;
- int flags, channels, bps, is_float, data_length;
+ int format, channels, bps, data_length;
int frame_length, last_frame_length, total_frames;
int32_t *decode_buffer;
int ret = 0;
// count ones
- while(get_bits1(gb))
+ while (get_bits_left(gb) > 0 && get_bits1(gb))
ret++;
return ret;
}
{
/* signature */
skip_bits(&s->gb, 32);
-// if (get_bits_long(&s->gb, 32) != av_bswap32(AV_RL32("TTA1"))) {
-// av_log(s->avctx, AV_LOG_ERROR, "Missing magic\n");
-// return -1;
-// }
-
- s->flags = get_bits(&s->gb, 16);
- if (s->flags != 1 && s->flags != 3)
- {
- av_log(s->avctx, AV_LOG_ERROR, "Invalid flags\n");
+
+ s->format = get_bits(&s->gb, 16);
+ if (s->format > 2) {
+ av_log(s->avctx, AV_LOG_ERROR, "Invalid format\n");
return -1;
}
- s->is_float = (s->flags == FORMAT_FLOAT);
+ if (s->format == FORMAT_ENCRYPTED) {
+ av_log_missing_feature(s->avctx, "Encrypted TTA", 0);
+ return AVERROR(EINVAL);
+ }
avctx->channels = s->channels = get_bits(&s->gb, 16);
if (s->channels > 1 && s->channels < 9)
avctx->channel_layout = tta_channel_layouts[s->channels-2];
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
- if (s->is_float)
- {
- avctx->sample_fmt = AV_SAMPLE_FMT_FLT;
- av_log_ask_for_sample(s->avctx, "Unsupported sample format.\n");
- return -1;
+ if (s->channels == 0) {
+ av_log(s->avctx, AV_LOG_ERROR, "Invalid number of channels\n");
+ return AVERROR_INVALIDDATA;
}
- else 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->bits_per_coded_sample = 24;
- 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;
+
+ switch(s->bps) {
+ case 1: avctx->sample_fmt = AV_SAMPLE_FMT_U8; break;
+ 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;
+ //case 4: avctx->sample_fmt = AV_SAMPLE_FMT_S32; 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 > 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 +
(s->last_frame_length ? 1 : 0);
- av_log(s->avctx, AV_LOG_DEBUG, "flags: %x chans: %d bps: %d rate: %d block: %d\n",
- s->flags, avctx->channels, avctx->bits_per_coded_sample, avctx->sample_rate,
+ 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);
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;
}
+ avcodec_get_frame_defaults(&s->frame);
+ avctx->coded_frame = &s->frame;
+
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)
{
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;
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 * av_get_bits_per_sample_fmt(avctx->sample_fmt) / 8)) {
- 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);
+ // FIXME: seeking
+ s->total_frames--;
+ if (!s->total_frames && s->last_frame_length)
+ framelen = s->last_frame_length;
+
+ /* get output buffer */
+ s->frame.nb_samples = framelen;
+ if ((ret = avctx->get_buffer(avctx, &s->frame)) < 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 = data;
+
+ // 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);
+ }
+
+ 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)
+ return -1;
- if (get_bits_left(&s->gb) < k)
+ 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)
- 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++;
- }
-
- // extract coded value
+ // extract coded value
#define UNFOLD(x) (((x)&1) ? (++(x)>>1) : (-(x)>>1))
- *p = UNFOLD(value);
+ *p = UNFOLD(value);
- // run hybrid filter
- ttafilter_process(filter, p, 0);
+ // run hybrid filter
+ ttafilter_process(filter, p, 0);
- // 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;
- }
- *predictor = *p;
-
- /*if ((get_bits_count(&s->gb)+7)/8 > buf_size)
- {
- av_log(NULL, AV_LOG_INFO, "overread!!\n");
- break;
- }*/
-
- // flip channels
- if (cur_chan < (s->channels-1))
- cur_chan++;
- else {
- // decorrelate in case of stereo integer
- if (!s->is_float && (s->channels > 1)) {
- int32_t *r = p - 1;
- for (*p += *r / 2; r > p - s->channels; r--)
- *r = *(r + 1) - *r;
- }
- cur_chan = 0;
+ 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 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;
}
+ }
- if (get_bits_left(&s->gb) < 32)
- return -1;
- skip_bits(&s->gb, 32); // frame crc
+ if (get_bits_left(&s->gb) < 32)
+ return -1;
+ skip_bits(&s->gb, 32); // frame crc
// convert to output buffer
switch(s->bps) {
case 1: {
- uint8_t *samples = data;
+ uint8_t *samples = (uint8_t *)s->frame.data[0];
for (p = s->decode_buffer; p < s->decode_buffer + (framelen * s->channels); p++)
*samples++ = *p + 0x80;
- *data_size = samples - (uint8_t *)data;
break;
}
case 2: {
- uint16_t *samples = data;
- for (p = s->decode_buffer; p < s->decode_buffer + (framelen * s->channels); p++) {
-// *samples++ = (unsigned char)*p;
-// *samples++ = (unsigned char)(*p >> 8);
+ uint16_t *samples = (int16_t *)s->frame.data[0];
+ for (p = s->decode_buffer; p < s->decode_buffer + (framelen * s->channels); p++)
*samples++ = *p;
- }
- *data_size = (uint8_t *)samples - (uint8_t *)data;
break;
}
case 3: {
- int32_t *samples = data;
+ // shift samples for 24-bit sample format
+ int32_t *samples = (int32_t *)s->frame.data[0];
for (p = s->decode_buffer; p < s->decode_buffer + (framelen * s->channels); p++)
- *samples++ = AV_RN32(p) << 8;
- *data_size = (uint8_t *)samples - (uint8_t *)data;
+ *samples++ <<= 8;
+ // reset decode buffer
+ s->decode_buffer = NULL;
break;
}
default:
av_log(s->avctx, AV_LOG_ERROR, "Error, only 16bit samples supported!\n");
}
- }
-// return get_bits_count(&s->gb)+7)/8;
+ *got_frame_ptr = 1;
+ *(AVFrame *)data = s->frame;
+
return buf_size;
}
.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)"),
};
projects / ffmpeg / blobdiff