* TTA (The Lossless True Audio) decoder
* Copyright (c) 2006 Alex Beregszaszi
*
- * This file is part of FFmpeg.
+ * This file is part of Libav.
*
- * FFmpeg is free software; you can redistribute it and/or
+ * Libav is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
- * FFmpeg is distributed in the hope that it will be useful,
+ * Libav is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
- * License along with FFmpeg; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ * License along with Libav; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
- * @file tta.c
+ * @file
* TTA (The Lossless True Audio) decoder
- * (www.true-audio.com or tta.corecodec.org)
+ * @see http://www.true-audio.com/
+ * @see http://tta.corecodec.org/
* @author Alex Beregszaszi
- *
*/
#define ALT_BITSTREAM_READER_LE
//#define DEBUG
#include <limits.h>
#include "avcodec.h"
-#include "bitstream.h"
+#include "get_bits.h"
#define FORMAT_INT 1
#define FORMAT_FLOAT 3
+#define MAX_ORDER 16
+typedef struct TTAFilter {
+ int32_t shift, round, error, mode;
+ int32_t qm[MAX_ORDER];
+ int32_t dx[MAX_ORDER];
+ int32_t dl[MAX_ORDER];
+} TTAFilter;
+
+typedef struct TTARice {
+ uint32_t k0, k1, sum0, sum1;
+} TTARice;
+
+typedef struct TTAChannel {
+ int32_t predictor;
+ TTAFilter filter;
+ TTARice rice;
+} TTAChannel;
+
typedef struct TTAContext {
AVCodecContext *avctx;
GetBitContext gb;
int frame_length, last_frame_length, total_frames;
int32_t *decode_buffer;
-} TTAContext;
-#if 0
-static inline int shift_1(int i)
-{
- if (i < 32)
- return 1 << i;
- else
- return 0x80000000; // 16 << 31
-}
+ TTAChannel *ch_ctx;
+} TTAContext;
-static inline int shift_16(int i)
-{
- if (i < 28)
- return 16 << i;
- else
- return 0x80000000; // 16 << 27
-}
-#else
static const uint32_t shift_1[] = {
0x00000001, 0x00000002, 0x00000004, 0x00000008,
0x00000010, 0x00000020, 0x00000040, 0x00000080,
0x80000000, 0x80000000, 0x80000000, 0x80000000
};
-static const uint32_t *shift_16 = shift_1 + 4;
-#endif
+static const uint32_t * const shift_16 = shift_1 + 4;
-#define MAX_ORDER 16
-typedef struct TTAFilter {
- int32_t shift, round, error, mode;
- int32_t qm[MAX_ORDER];
- int32_t dx[MAX_ORDER];
- int32_t dl[MAX_ORDER];
-} TTAFilter;
-
-static int32_t ttafilter_configs[4][2] = {
+static const int32_t ttafilter_configs[4][2] = {
{10, 1},
{9, 1},
{10, 1},
memshl(c->dx, c->dx + 1);
}
-typedef struct TTARice {
- uint32_t k0, k1, sum0, sum1;
-} TTARice;
-
static void rice_init(TTARice *c, uint32_t k0, uint32_t k1)
{
c->k0 = k0;
return ret;
}
-static int tta_decode_init(AVCodecContext * avctx)
+static av_cold int tta_decode_init(AVCodecContext * avctx)
{
TTAContext *s = avctx->priv_data;
int i;
if (avctx->extradata_size < 30)
return -1;
- init_get_bits(&s->gb, avctx->extradata, avctx->extradata_size);
- if (show_bits_long(&s->gb, 32) == ff_get_fourcc("TTA1"))
+ init_get_bits(&s->gb, avctx->extradata, avctx->extradata_size * 8);
+ if (show_bits_long(&s->gb, 32) == AV_RL32("TTA1"))
{
/* signature */
skip_bits(&s->gb, 32);
-// if (get_bits_long(&s->gb, 32) != bswap_32(ff_get_fourcc("TTA1"))) {
+// 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->is_float = (s->flags == FORMAT_FLOAT);
avctx->channels = s->channels = get_bits(&s->gb, 16);
- avctx->bits_per_sample = get_bits(&s->gb, 16);
- s->bps = (avctx->bits_per_sample + 7) / 8;
+ 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");
if (s->is_float)
{
- avctx->sample_fmt = SAMPLE_FMT_FLT;
- av_log(s->avctx, AV_LOG_ERROR, "Unsupported sample format. Please contact the developers.\n");
+ avctx->sample_fmt = AV_SAMPLE_FMT_FLT;
+ av_log_ask_for_sample(s->avctx, "Unsupported sample format.\n");
return -1;
}
else switch(s->bps) {
-// case 1: avctx->sample_fmt = SAMPLE_FMT_U8; break;
- case 2: avctx->sample_fmt = SAMPLE_FMT_S16; break;
-// case 3: avctx->sample_fmt = SAMPLE_FMT_S24; break;
- case 4: avctx->sample_fmt = SAMPLE_FMT_S32; break;
+// 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(s->avctx, AV_LOG_ERROR, "Invalid/unsupported sample format. Please contact the developers.\n");
+ av_log_ask_for_sample(s->avctx,
+ "Invalid/unsupported sample format.\n");
return -1;
}
(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_sample, avctx->sample_rate,
+ s->flags, 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->decode_buffer = av_mallocz(sizeof(int32_t)*s->frame_length*s->channels);
+ s->ch_ctx = av_malloc(avctx->channels * sizeof(*s->ch_ctx));
+ if (!s->ch_ctx)
+ return AVERROR(ENOMEM);
} else {
av_log(avctx, AV_LOG_ERROR, "Wrong extradata present\n");
return -1;
static int tta_decode_frame(AVCodecContext *avctx,
void *data, int *data_size,
- uint8_t *buf, int buf_size)
+ AVPacket *avpkt)
{
+ const uint8_t *buf = avpkt->data;
+ int buf_size = avpkt->size;
TTAContext *s = avctx->priv_data;
int i;
init_get_bits(&s->gb, buf, buf_size*8);
{
- int32_t predictors[s->channels];
- TTAFilter filters[s->channels];
- TTARice rices[s->channels];
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)
// init per channel states
for (i = 0; i < s->channels; i++) {
- predictors[i] = 0;
- ttafilter_init(&(filters[i]), ttafilter_configs[s->bps-1][0], ttafilter_configs[s->bps-1][1]);
- rice_init(&(rices[i]), 10, 10);
+ 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 = &(predictors[cur_chan]);
- TTAFilter *filter = &(filters[cur_chan]);
- TTARice *rice = &(rices[cur_chan]);
+ 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--;
}
- if (k)
+ 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
+ } else
value = unary;
// FIXME: copy paste from original
rice->k0++;
}
- // extract sign
-#define SIGN(x) (((x)&1) ? (++(x)>>1) : (-(x)>>1))
- *p = SIGN(value);
+ // extract coded value
+#define UNFOLD(x) (((x)&1) ? (++(x)>>1) : (-(x)>>1))
+ *p = UNFOLD(value);
// run hybrid filter
ttafilter_process(filter, p, 0);
}
*predictor = *p;
-#if 0
- // extract 32bit float from last two int samples
- if (s->is_float && ((p - data) & 1)) {
- uint32_t neg = *p & 0x80000000;
- uint32_t hi = *(p - 1);
- uint32_t lo = abs(*p) - 1;
-
- hi += (hi || lo) ? 0x3f80 : 0;
- // SWAP16: swap all the 16 bits
- *(p - 1) = (hi << 16) | SWAP16(lo) | neg;
- }
-#endif
-
/*if ((get_bits_count(&s->gb)+7)/8 > buf_size)
{
av_log(NULL, AV_LOG_INFO, "overread!!\n");
}
}
+ if (get_bits_left(&s->gb) < 32)
+ return -1;
skip_bits(&s->gb, 32); // frame crc
// convert to output buffer
return buf_size;
}
-static int tta_decode_close(AVCodecContext *avctx) {
+static av_cold int tta_decode_close(AVCodecContext *avctx) {
TTAContext *s = avctx->priv_data;
- if (s->decode_buffer)
- av_free(s->decode_buffer);
+ av_free(s->decode_buffer);
+ av_freep(&s->ch_ctx);
return 0;
}
-AVCodec tta_decoder = {
- "tta",
- CODEC_TYPE_AUDIO,
- CODEC_ID_TTA,
- sizeof(TTAContext),
- tta_decode_init,
- NULL,
- tta_decode_close,
- tta_decode_frame,
+AVCodec ff_tta_decoder = {
+ .name = "tta",
+ .type = AVMEDIA_TYPE_AUDIO,
+ .id = 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)"),
};
projects / ffmpeg / blobdiff