[SCM] libav/experimental: tta decoder, tested with 44khz mono and stereo (for the latter use ffplay or change MAX_AUDIO_FRAME_SIZE)
siretart at users.alioth.debian.org
siretart at users.alioth.debian.org
Sun Jun 30 15:46:28 UTC 2013
The following commit has been merged in the experimental branch:
commit a24c4a2ae44fb81175f6a3aa846820fb201b3135
Author: Alex Beregszaszi <alex at rtfs.hu>
Date: Sun Feb 12 02:15:19 2006 +0000
tta decoder, tested with 44khz mono and stereo (for the latter use ffplay or change MAX_AUDIO_FRAME_SIZE)
Originally committed as revision 4996 to svn://svn.ffmpeg.org/ffmpeg/trunk
diff --git a/libavcodec/Makefile b/libavcodec/Makefile
index 50e4260..9437f3e 100644
--- a/libavcodec/Makefile
+++ b/libavcodec/Makefile
@@ -169,6 +169,9 @@ endif
ifeq ($(CONFIG_TRUESPEECH_DECODER),yes)
OBJS+= truespeech.o
endif
+ifeq ($(CONFIG_TTA_DECODER),yes)
+ OBJS+= tta.o
+endif
ifeq ($(CONFIG_TSCC_DECODER),yes)
OBJS+= tscc.o
endif
diff --git a/libavcodec/allcodecs.c b/libavcodec/allcodecs.c
index 2b73d1b..e78312d 100644
--- a/libavcodec/allcodecs.c
+++ b/libavcodec/allcodecs.c
@@ -505,6 +505,9 @@ void avcodec_register_all(void)
#ifdef CONFIG_TRUESPEECH_DECODER
register_avcodec(&truespeech_decoder);
#endif //CONFIG_TRUESPEECH_DECODER
+#ifdef CONFIG_TTA_DECODER
+ register_avcodec(&tta_decoder);
+#endif //CONFIG_TTA_DECODER
#ifdef CONFIG_RAWVIDEO_DECODER
register_avcodec(&rawvideo_decoder);
#endif //CONFIG_RAWVIDEO_DECODER
diff --git a/libavcodec/avcodec.h b/libavcodec/avcodec.h
index c34fcf1..513c88d 100644
--- a/libavcodec/avcodec.h
+++ b/libavcodec/avcodec.h
@@ -191,6 +191,7 @@ enum CodecID {
CODEC_ID_QDM2,
CODEC_ID_COOK,
CODEC_ID_TRUESPEECH,
+ CODEC_ID_TTA,
CODEC_ID_OGGTHEORA= 0x16000,
@@ -2154,6 +2155,7 @@ extern AVCodec mp3on4_decoder;
extern AVCodec qdm2_decoder;
extern AVCodec cook_decoder;
extern AVCodec truespeech_decoder;
+extern AVCodec tta_decoder;
extern AVCodec mace3_decoder;
extern AVCodec mace6_decoder;
extern AVCodec huffyuv_decoder;
diff --git a/libavcodec/tta.c b/libavcodec/tta.c
new file mode 100644
index 0000000..e35853a
--- /dev/null
+++ b/libavcodec/tta.c
@@ -0,0 +1,446 @@
+/*
+ * TTA (The Lossless True Audio) decoder
+ * Copyright (c) 2006 Alex Beregszaszi
+ *
+ * This library 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 of the License, or (at your option) any later version.
+ *
+ * This library 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 this library; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+/**
+ * @file tta.c
+ * TTA (The Lossless True Audio) decoder
+ * (www.true-audio.com or tta.corecodec.org)
+ * @author Alex Beregszaszi
+ *
+ */
+
+#define ALT_BITSTREAM_READER_LE
+//#define DEBUG
+#include <limits.h>
+#include "avcodec.h"
+#include "bitstream.h"
+
+#define FORMAT_INT 1
+#define FORMAT_FLOAT 3
+
+typedef struct TTAContext {
+ AVCodecContext *avctx;
+ GetBitContext gb;
+
+ int flags, channels, bps, is_float, data_length;
+ int frame_length, last_frame_length, total_frames;
+
+ long *decode_buffer;
+} TTAContext;
+
+#if 0
+static inline int shift_1(int i)
+{
+ if (i < 32)
+ return 1 << i;
+ else
+ return 0x80000000; // 16 << 31
+}
+
+static inline int shift_16(int i)
+{
+ if (i < 28)
+ return 16 << i;
+ else
+ return 0x80000000; // 16 << 27
+}
+#else
+static const unsigned long shift_1[] = {
+ 0x00000001, 0x00000002, 0x00000004, 0x00000008,
+ 0x00000010, 0x00000020, 0x00000040, 0x00000080,
+ 0x00000100, 0x00000200, 0x00000400, 0x00000800,
+ 0x00001000, 0x00002000, 0x00004000, 0x00008000,
+ 0x00010000, 0x00020000, 0x00040000, 0x00080000,
+ 0x00100000, 0x00200000, 0x00400000, 0x00800000,
+ 0x01000000, 0x02000000, 0x04000000, 0x08000000,
+ 0x10000000, 0x20000000, 0x40000000, 0x80000000,
+ 0x80000000, 0x80000000, 0x80000000, 0x80000000,
+ 0x80000000, 0x80000000, 0x80000000, 0x80000000
+};
+
+static const unsigned long *shift_16 = shift_1 + 4;
+#endif
+
+#define MAX_ORDER 16
+typedef struct TTAFilter {
+ long shift, round, error, mode;
+ long qm[MAX_ORDER];
+ long dx[MAX_ORDER];
+ long dl[MAX_ORDER];
+} TTAFilter;
+
+static long ttafilter_configs[4][2] = {
+ {10, 1},
+ {9, 1},
+ {10, 1},
+ {12, 0}
+};
+
+static void ttafilter_init(TTAFilter *c, long shift, long mode) {
+ 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
+static inline void memshl(register long *a, register long *b) {
+ *a++ = *b++;
+ *a++ = *b++;
+ *a++ = *b++;
+ *a++ = *b++;
+ *a++ = *b++;
+ *a++ = *b++;
+ *a++ = *b++;
+ *a = *b;
+}
+
+// FIXME: copy paste from original
+// mode=1 encoder, mode=0 decoder
+static inline void ttafilter_process(TTAFilter *c, long *in, long mode) {
+ register long *dl = c->dl, *qm = c->qm, *dx = c->dx, sum = c->round;
+
+ if (!c->error) {
+ sum += *dl++ * *qm, qm++;
+ sum += *dl++ * *qm, qm++;
+ sum += *dl++ * *qm, qm++;
+ sum += *dl++ * *qm, qm++;
+ sum += *dl++ * *qm, qm++;
+ sum += *dl++ * *qm, qm++;
+ sum += *dl++ * *qm, qm++;
+ sum += *dl++ * *qm, qm++;
+ dx += 8;
+ } else if(c->error < 0) {
+ sum += *dl++ * (*qm -= *dx++), qm++;
+ sum += *dl++ * (*qm -= *dx++), qm++;
+ sum += *dl++ * (*qm -= *dx++), qm++;
+ sum += *dl++ * (*qm -= *dx++), qm++;
+ sum += *dl++ * (*qm -= *dx++), qm++;
+ sum += *dl++ * (*qm -= *dx++), qm++;
+ sum += *dl++ * (*qm -= *dx++), qm++;
+ sum += *dl++ * (*qm -= *dx++), qm++;
+ } else {
+ sum += *dl++ * (*qm += *dx++), qm++;
+ sum += *dl++ * (*qm += *dx++), qm++;
+ sum += *dl++ * (*qm += *dx++), qm++;
+ sum += *dl++ * (*qm += *dx++), qm++;
+ sum += *dl++ * (*qm += *dx++), qm++;
+ sum += *dl++ * (*qm += *dx++), qm++;
+ sum += *dl++ * (*qm += *dx++), qm++;
+ sum += *dl++ * (*qm += *dx++), qm++;
+ }
+
+ *(dx-0) = ((*(dl-1) >> 30) | 1) << 2;
+ *(dx-1) = ((*(dl-2) >> 30) | 1) << 1;
+ *(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;
+ }
+
+ if (c->mode) {
+ *(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);
+}
+
+typedef struct TTARice {
+ unsigned long k0, k1, sum0, sum1;
+} TTARice;
+
+static void rice_init(TTARice *c, unsigned long k0, unsigned long k1)
+{
+ c->k0 = k0;
+ c->k1 = k1;
+ c->sum0 = shift_16[k0];
+ c->sum1 = shift_16[k1];
+}
+
+static int tta_get_unary(GetBitContext *gb)
+{
+ int ret = 0;
+
+ // count ones
+ while(get_bits1(gb))
+ ret++;
+ return ret;
+}
+
+// shamelessly copied from shorten.c
+static int inline get_le16(GetBitContext *gb)
+{
+ return bswap_16(get_bits_long(gb, 16));
+}
+
+static int inline get_le32(GetBitContext *gb)
+{
+ return bswap_32(get_bits_long(gb, 32));
+}
+
+static int tta_decode_init(AVCodecContext * avctx)
+{
+ TTAContext *s = avctx->priv_data;
+ int i;
+
+ s->avctx = avctx;
+
+ // 30bytes includes a seektable with one frame
+ if (avctx->extradata_size < 30)
+ return -1;
+
+ init_get_bits(&s->gb, avctx->extradata, avctx->extradata_size);
+ if (show_bits_long(&s->gb, 32) == bswap_32(ff_get_fourcc("TTA1")))
+ {
+ /* signature */
+ skip_bits(&s->gb, 32);
+// if (get_bits_long(&s->gb, 32) != bswap_32(ff_get_fourcc("TTA1"))) {
+// av_log(s->avctx, AV_LOG_ERROR, "Missing magic\n");
+// return -1;
+// }
+
+ s->flags = get_le16(&s->gb);
+ if (s->flags != 1 && s->flags != 3)
+ {
+ av_log(s->avctx, AV_LOG_ERROR, "Invalid flags\n");
+ return -1;
+ }
+ s->is_float = (s->flags == FORMAT_FLOAT);
+ avctx->channels = s->channels = get_le16(&s->gb);
+ avctx->bits_per_sample = get_le16(&s->gb);
+ s->bps = (avctx->bits_per_sample + 7) / 8;
+ avctx->sample_rate = get_le32(&s->gb);
+ s->data_length = get_le32(&s->gb);
+ skip_bits(&s->gb, 32); // CRC32 of header
+
+ 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");
+ 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;
+ default:
+ av_log(s->avctx, AV_LOG_ERROR, "Invalid/unsupported sample format. Please contact the developers.\n");
+ return -1;
+ }
+
+ // FIXME: horribly broken, but directly from reference source
+#define FRAME_TIME 1.04489795918367346939
+ s->frame_length = (int)(FRAME_TIME * avctx->sample_rate);
+
+ 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_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);
+
+ // FIXME: seek table
+ for (i = 0; i < s->total_frames; i++)
+ skip_bits(&s->gb, 32);
+ skip_bits(&s->gb, 32); // CRC32 of seektable
+
+ s->decode_buffer = av_mallocz(sizeof(long)*s->frame_length*s->channels);
+ } 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,
+ uint8_t *buf, int buf_size)
+{
+ TTAContext *s = avctx->priv_data;
+ int i;
+
+ init_get_bits(&s->gb, buf, buf_size*8);
+ {
+ long predictors[s->channels];
+ TTAFilter filters[s->channels];
+ TTARice rices[s->channels];
+ int cur_chan = 0, framelen = s->frame_length;
+ long *p;
+
+ // 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++) {
+ 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);
+ }
+
+ for (p = s->decode_buffer; p < s->decode_buffer + (framelen * s->channels); p++) {
+ long *predictor = &(predictors[cur_chan]);
+ TTAFilter *filter = &(filters[cur_chan]);
+ TTARice *rice = &(rices[cur_chan]);
+ unsigned long unary, depth, k;
+ long value;
+
+ unary = tta_get_unary(&s->gb);
+
+ if (unary == 0) {
+ depth = 0;
+ k = rice->k0;
+ } else {
+ depth = 1;
+ k = rice->k1;
+ unary--;
+ }
+
+ if (k)
+ 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 sign
+#define SIGN(x) (((x)&1) ? (++(x)>>1) : (-(x)>>1))
+ *p = SIGN(value);
+
+ // run hybrid filter
+ ttafilter_process(filter, p, 0);
+
+ // fixed order prediction
+#define PRED(x, k) (long)((((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 0
+ // extract 32bit float from last two int samples
+ if (s->is_float && ((p - data) & 1)) {
+ unsigned long neg = *p & 0x80000000;
+ unsigned long hi = *(p - 1);
+ unsigned long 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");
+ 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)) {
+ long *r = p - 1;
+ for (*p += *r / 2; r > p - s->channels; r--)
+ *r = *(r + 1) - *r;
+ }
+ cur_chan = 0;
+ }
+ }
+
+ skip_bits(&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++ = (unsigned char)*p;
+// *samples++ = (unsigned char)(*p >> 8);
+ *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");
+ }
+ }
+
+// return get_bits_count(&s->gb)+7)/8;
+ return buf_size;
+}
+
+static int tta_decode_close(AVCodecContext *avctx) {
+ TTAContext *s = avctx->priv_data;
+
+ if (s->decode_buffer)
+ av_free(s->decode_buffer);
+
+ return 0;
+}
+
+AVCodec tta_decoder = {
+ "tta",
+ CODEC_TYPE_AUDIO,
+ CODEC_ID_TTA,
+ sizeof(TTAContext),
+ tta_decode_init,
+ NULL,
+ tta_decode_close,
+ tta_decode_frame,
+};
--
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