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ttaenc.c
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1 /*
2  * TTA (The Lossless True Audio) encoder
3  *
4  * This file is part of FFmpeg.
5  *
6  * FFmpeg is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU Lesser General Public
8  * License as published by the Free Software Foundation; either
9  * version 2.1 of the License, or (at your option) any later version.
10  *
11  * FFmpeg is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14  * Lesser General Public License for more details.
15  *
16  * You should have received a copy of the GNU Lesser General Public
17  * License along with FFmpeg; if not, write to the Free Software
18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19  */
20 
21 #define BITSTREAM_WRITER_LE
22 #include "ttadata.h"
23 #include "ttaencdsp.h"
24 #include "avcodec.h"
25 #include "put_bits.h"
26 #include "internal.h"
27 #include "libavutil/crc.h"
28 
29 typedef struct TTAEncContext {
30  const AVCRC *crc_table;
31  int bps;
35 
37 {
38  TTAEncContext *s = avctx->priv_data;
39 
41 
42  switch (avctx->sample_fmt) {
43  case AV_SAMPLE_FMT_U8:
44  avctx->bits_per_raw_sample = 8;
45  break;
46  case AV_SAMPLE_FMT_S16:
47  avctx->bits_per_raw_sample = 16;
48  break;
49  case AV_SAMPLE_FMT_S32:
50  if (avctx->bits_per_raw_sample > 24)
51  av_log(avctx, AV_LOG_WARNING, "encoding as 24 bits-per-sample\n");
52  avctx->bits_per_raw_sample = 24;
53  }
54 
55  s->bps = avctx->bits_per_raw_sample >> 3;
56  avctx->frame_size = 256 * avctx->sample_rate / 245;
57 
58  s->ch_ctx = av_malloc_array(avctx->channels, sizeof(*s->ch_ctx));
59  if (!s->ch_ctx)
60  return AVERROR(ENOMEM);
61 
63 
64  return 0;
65 }
66 
67 static int32_t get_sample(const AVFrame *frame, int sample,
69 {
70  int32_t ret;
71 
72  if (format == AV_SAMPLE_FMT_U8) {
73  ret = frame->data[0][sample] - 0x80;
74  } else if (format == AV_SAMPLE_FMT_S16) {
75  const int16_t *ptr = (const int16_t *)frame->data[0];
76  ret = ptr[sample];
77  } else {
78  const int32_t *ptr = (const int32_t *)frame->data[0];
79  ret = ptr[sample] >> 8;
80  }
81 
82  return ret;
83 }
84 
85 static int tta_encode_frame(AVCodecContext *avctx, AVPacket *avpkt,
86  const AVFrame *frame, int *got_packet_ptr)
87 {
88  TTAEncContext *s = avctx->priv_data;
89  PutBitContext pb;
90  int ret, i, out_bytes, cur_chan, res, samples;
91  int64_t pkt_size = frame->nb_samples * 2LL * avctx->channels * s->bps;
92 
93 pkt_alloc:
94  cur_chan = 0, res = 0, samples = 0;
95  if ((ret = ff_alloc_packet2(avctx, avpkt, pkt_size, 0)) < 0)
96  return ret;
97  init_put_bits(&pb, avpkt->data, avpkt->size);
98 
99  // init per channel states
100  for (i = 0; i < avctx->channels; i++) {
101  s->ch_ctx[i].predictor = 0;
103  ff_tta_rice_init(&s->ch_ctx[i].rice, 10, 10);
104  }
105 
106  for (i = 0; i < frame->nb_samples * avctx->channels; i++) {
107  TTAChannel *c = &s->ch_ctx[cur_chan];
108  TTAFilter *filter = &c->filter;
109  TTARice *rice = &c->rice;
110  uint32_t k, unary, outval;
111  int32_t value, temp;
112 
113  value = get_sample(frame, samples++, avctx->sample_fmt);
114 
115  if (avctx->channels > 1) {
116  if (cur_chan < avctx->channels - 1)
117  value = res = get_sample(frame, samples, avctx->sample_fmt) - value;
118  else
119  value -= res / 2;
120  }
121 
122  temp = value;
123 #define PRED(x, k) (int32_t)((((uint64_t)(x) << (k)) - (x)) >> (k))
124  switch (s->bps) {
125  case 1: value -= PRED(c->predictor, 4); break;
126  case 2:
127  case 3: value -= PRED(c->predictor, 5); break;
128  }
129  c->predictor = temp;
130 
131  s->dsp.filter_process(filter->qm, filter->dx, filter->dl, &filter->error, &value,
132  filter->shift, filter->round);
133  outval = (value > 0) ? (value << 1) - 1: -value << 1;
134 
135  k = rice->k0;
136 
137  rice->sum0 += outval - (rice->sum0 >> 4);
138  if (rice->k0 > 0 && rice->sum0 < ff_tta_shift_16[rice->k0])
139  rice->k0--;
140  else if (rice->sum0 > ff_tta_shift_16[rice->k0 + 1])
141  rice->k0++;
142 
143  if (outval >= ff_tta_shift_1[k]) {
144  outval -= ff_tta_shift_1[k];
145  k = rice->k1;
146 
147  rice->sum1 += outval - (rice->sum1 >> 4);
148  if (rice->k1 > 0 && rice->sum1 < ff_tta_shift_16[rice->k1])
149  rice->k1--;
150  else if (rice->sum1 > ff_tta_shift_16[rice->k1 + 1])
151  rice->k1++;
152 
153  unary = 1 + (outval >> k);
154  if (unary + 100LL > put_bits_left(&pb)) {
155  if (pkt_size < INT_MAX/2) {
156  pkt_size *= 2;
157  av_packet_unref(avpkt);
158  goto pkt_alloc;
159  } else
160  return AVERROR(ENOMEM);
161  }
162  do {
163  if (unary > 31) {
164  put_bits(&pb, 31, 0x7FFFFFFF);
165  unary -= 31;
166  } else {
167  put_bits(&pb, unary, (1 << unary) - 1);
168  unary = 0;
169  }
170  } while (unary);
171  }
172 
173  put_bits(&pb, 1, 0);
174 
175  if (k)
176  put_bits(&pb, k, outval & (ff_tta_shift_1[k] - 1));
177 
178  if (cur_chan < avctx->channels - 1)
179  cur_chan++;
180  else
181  cur_chan = 0;
182  }
183 
184  flush_put_bits(&pb);
185  out_bytes = put_bits_count(&pb) >> 3;
186  put_bits32(&pb, av_crc(s->crc_table, UINT32_MAX, avpkt->data, out_bytes) ^ UINT32_MAX);
187  flush_put_bits(&pb);
188 
189  avpkt->pts = frame->pts;
190  avpkt->size = out_bytes + 4;
191  avpkt->duration = ff_samples_to_time_base(avctx, frame->nb_samples);
192  *got_packet_ptr = 1;
193  return 0;
194 }
195 
197 {
198  TTAEncContext *s = avctx->priv_data;
199  av_freep(&s->ch_ctx);
200  return 0;
201 }
202 
204  .name = "tta",
205  .long_name = NULL_IF_CONFIG_SMALL("TTA (True Audio)"),
206  .type = AVMEDIA_TYPE_AUDIO,
207  .id = AV_CODEC_ID_TTA,
208  .priv_data_size = sizeof(TTAEncContext),
210  .close = tta_encode_close,
211  .encode2 = tta_encode_frame,
213  .sample_fmts = (const enum AVSampleFormat[]){ AV_SAMPLE_FMT_U8,
217 };
static void av_unused put_bits32(PutBitContext *s, uint32_t value)
Write exactly 32 bits into a bitstream.
Definition: put_bits.h:250
const char * s
Definition: avisynth_c.h:768
This structure describes decoded (raw) audio or video data.
Definition: frame.h:201
static void put_bits(Jpeg2000EncoderContext *s, int val, int n)
put n times val bit
Definition: j2kenc.c:207
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:182
else temp
Definition: vf_mcdeint.c:256
static av_cold int init(AVCodecContext *avctx)
Definition: avrndec.c:35
static int32_t get_sample(const AVFrame *frame, int sample, enum AVSampleFormat format)
Definition: ttaenc.c:67
channels
Definition: aptx.c:30
void ff_tta_rice_init(TTARice *c, uint32_t k0, uint32_t k1)
Definition: ttadata.c:40
int size
Definition: avcodec.h:1401
int32_t predictor
Definition: ttadata.h:39
void(* filter_process)(int32_t *qm, int32_t *dx, int32_t *dl, int32_t *error, int32_t *in, int32_t shift, int32_t round)
Definition: ttaencdsp.h:25
int bits_per_raw_sample
Bits per sample/pixel of internal libavcodec pixel/sample format.
Definition: avcodec.h:2711
#define sample
AVCodec.
Definition: avcodec.h:3351
TTAEncDSPContext dsp
Definition: ttaenc.c:33
int32_t error
Definition: ttadata.h:28
int ff_alloc_packet2(AVCodecContext *avctx, AVPacket *avpkt, int64_t size, int64_t min_size)
Check AVPacket size and/or allocate data.
Definition: encode.c:32
static void filter(int16_t *output, ptrdiff_t out_stride, int16_t *low, ptrdiff_t low_stride, int16_t *high, ptrdiff_t high_stride, int len, int clip)
Definition: cfhd.c:97
int32_t round
Definition: ttadata.h:28
enum AVSampleFormat sample_fmt
audio sample format
Definition: avcodec.h:2151
#define av_cold
Definition: attributes.h:82
AV_SAMPLE_FMT_U8
int64_t duration
Duration of this packet in AVStream->time_base units, 0 if unknown.
Definition: avcodec.h:1418
int64_t pts
Presentation timestamp in time_base units (time when frame should be shown to user).
Definition: frame.h:294
static AVFrame * frame
Public header for CRC hash function implementation.
av_cold void ff_ttaencdsp_init(TTAEncDSPContext *c)
Definition: ttaencdsp.c:53
uint8_t * data
Definition: avcodec.h:1400
int32_t qm[MAX_ORDER]
Definition: ttadata.h:29
int32_t shift
Definition: ttadata.h:28
signed 32 bits
Definition: samplefmt.h:62
#define av_log(a,...)
const AVCRC * crc_table
Definition: ttaenc.c:30
static int put_bits_left(PutBitContext *s)
Definition: put_bits.h:93
#define AVERROR(e)
Definition: error.h:43
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:186
const char * name
Name of the codec implementation.
Definition: avcodec.h:3358
uint32_t sum1
Definition: ttadata.h:35
static int put_bits_count(PutBitContext *s)
Definition: put_bits.h:85
static av_cold int tta_encode_close(AVCodecContext *avctx)
Definition: ttaenc.c:196
const uint32_t ff_tta_shift_1[]
Definition: ttadata.c:23
#define AV_CODEC_CAP_SMALL_LAST_FRAME
Codec can be fed a final frame with a smaller size.
Definition: avcodec.h:986
GLsizei GLboolean const GLfloat * value
Definition: opengl_enc.c:109
const uint32_t *const ff_tta_shift_16
Definition: ttadata.c:36
int32_t
uint32_t av_crc(const AVCRC *ctx, uint32_t crc, const uint8_t *buffer, size_t length)
Calculate the CRC of a block.
Definition: crc.c:366
uint32_t k1
Definition: ttadata.h:35
int frame_size
Number of samples per channel in an audio frame.
Definition: avcodec.h:2163
TTAChannel * ch_ctx
Definition: ttaenc.c:32
Libavcodec external API header.
AVSampleFormat
Audio sample formats.
Definition: samplefmt.h:58
int sample_rate
samples per second
Definition: avcodec.h:2143
#define PRED(x, k)
const uint8_t ff_tta_filter_configs[]
Definition: ttadata.c:38
main external API structure.
Definition: avcodec.h:1488
void av_packet_unref(AVPacket *pkt)
Wipe the packet.
Definition: avpacket.c:590
int32_t dx[MAX_ORDER]
Definition: ttadata.h:30
AVCodec ff_tta_encoder
Definition: ttaenc.c:203
static const char * format
Definition: movenc.c:47
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:215
const AVCRC * av_crc_get_table(AVCRCId crc_id)
Get an initialized standard CRC table.
Definition: crc.c:349
uint32_t k0
Definition: ttadata.h:35
common internal api header.
static void flush_put_bits(PutBitContext *s)
Pad the end of the output stream with zeros.
Definition: put_bits.h:101
static av_cold int tta_encode_init(AVCodecContext *avctx)
Definition: ttaenc.c:36
signed 16 bits
Definition: samplefmt.h:61
static double c[64]
#define AV_CODEC_CAP_LOSSLESS
Codec is lossless.
Definition: avcodec.h:1046
static void init_put_bits(PutBitContext *s, uint8_t *buffer, int buffer_size)
Initialize the PutBitContext s.
Definition: put_bits.h:48
void * priv_data
Definition: avcodec.h:1515
TTAFilter filter
Definition: ttadata.h:40
int channels
number of audio channels
Definition: avcodec.h:2144
int32_t dl[MAX_ORDER]
Definition: ttadata.h:31
static enum AVSampleFormat sample_fmts[]
Definition: adpcmenc.c:701
#define av_freep(p)
static av_always_inline int64_t ff_samples_to_time_base(AVCodecContext *avctx, int64_t samples)
Rescale from sample rate to AVCodecContext.time_base.
Definition: internal.h:290
#define av_malloc_array(a, b)
TTARice rice
Definition: ttadata.h:41
void ff_tta_filter_init(TTAFilter *c, int32_t shift)
Definition: ttadata.c:48
static int tta_encode_frame(AVCodecContext *avctx, AVPacket *avpkt, const AVFrame *frame, int *got_packet_ptr)
Definition: ttaenc.c:85
This structure stores compressed data.
Definition: avcodec.h:1377
int nb_samples
number of audio samples (per channel) described by this frame
Definition: frame.h:267
uint32_t AVCRC
Definition: crc.h:47
int64_t pts
Presentation timestamp in AVStream->time_base units; the time at which the decompressed packet will b...
Definition: avcodec.h:1393
uint32_t sum0
Definition: ttadata.h:35
bitstream writer API