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tscc2.c
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1 /*
2  * TechSmith Screen Codec 2 (aka Dora) decoder
3  * Copyright (c) 2012 Konstantin Shishkov
4  *
5  * This file is part of FFmpeg.
6  *
7  * FFmpeg is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU Lesser General Public
9  * License as published by the Free Software Foundation; either
10  * version 2.1 of the License, or (at your option) any later version.
11  *
12  * FFmpeg is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15  * Lesser General Public License for more details.
16  *
17  * You should have received a copy of the GNU Lesser General Public
18  * License along with FFmpeg; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21 
22 /**
23  * @file
24  * TechSmith Screen Codec 2 decoder
25  */
26 
27 #include <inttypes.h>
28 
29 #define BITSTREAM_READER_LE
30 #include "avcodec.h"
31 #include "get_bits.h"
32 #include "bytestream.h"
33 #include "internal.h"
34 #include "mathops.h"
35 #include "tscc2data.h"
36 
37 typedef struct TSCC2Context {
42  int quant[2];
43  int q[2][3];
45 
47  int block[16];
48 } TSCC2Context;
49 
51 {
52  int i;
53 
54  ff_free_vlc(&c->dc_vlc);
55  for (i = 0; i < NUM_VLC_SETS; i++) {
56  ff_free_vlc(c->nc_vlc + i);
57  ff_free_vlc(c->ac_vlc + i);
58  }
59 }
60 
62 {
63  int i, ret;
64 
66  tscc2_dc_vlc_bits, 1, 1,
67  tscc2_dc_vlc_codes, 2, 2,
69  if (ret)
70  return ret;
71 
72  for (i = 0; i < NUM_VLC_SETS; i++) {
73  ret = ff_init_vlc_sparse(c->nc_vlc + i, 9, 16,
74  tscc2_nc_vlc_bits[i], 1, 1,
75  tscc2_nc_vlc_codes[i], 2, 2,
77  if (ret) {
78  free_vlcs(c);
79  return ret;
80  }
81  ret = ff_init_vlc_sparse(c->ac_vlc + i, 9, tscc2_ac_vlc_sizes[i],
82  tscc2_ac_vlc_bits[i], 1, 1,
83  tscc2_ac_vlc_codes[i], 2, 2,
84  tscc2_ac_vlc_syms[i], 2, 2, INIT_VLC_LE);
85  if (ret) {
86  free_vlcs(c);
87  return ret;
88  }
89  }
90 
91  return 0;
92 }
93 
94 #define DEQUANT(val, q) (((q) * (val) + 0x80) >> 8)
95 #define DCT1D(d0, d1, d2, d3, s0, s1, s2, s3, OP) \
96  OP(d0, 5 * ((s0) + (s1) + (s2)) + 2 * (s3)); \
97  OP(d1, 5 * ((s0) - (s2) - (s3)) + 2 * (s1)); \
98  OP(d2, 5 * ((s0) - (s2) + (s3)) - 2 * (s1)); \
99  OP(d3, 5 * ((s0) - (s1) + (s2)) - 2 * (s3)); \
100 
101 #define COL_OP(a, b) a = (b)
102 #define ROW_OP(a, b) a = ((b) + 0x20) >> 6
103 
104 static void tscc2_idct4_put(int *in, int q[3], uint8_t *dst, int stride)
105 {
106  int i;
107  int tblk[4 * 4];
108  int t0, t1, t2, t3;
109 
110  for (i = 0; i < 4; i++) {
111  t0 = DEQUANT(q[0 + (i & 1)], in[0 * 4 + i]);
112  t1 = DEQUANT(q[1 + (i & 1)], in[1 * 4 + i]);
113  t2 = DEQUANT(q[0 + (i & 1)], in[2 * 4 + i]);
114  t3 = DEQUANT(q[1 + (i & 1)], in[3 * 4 + i]);
115  DCT1D(tblk[0 * 4 + i], tblk[1 * 4 + i],
116  tblk[2 * 4 + i], tblk[3 * 4 + i],
117  t0, t1, t2, t3, COL_OP);
118  }
119  for (i = 0; i < 4; i++) {
120  DCT1D(dst[0], dst[1], dst[2], dst[3],
121  tblk[i * 4 + 0], tblk[i * 4 + 1],
122  tblk[i * 4 + 2], tblk[i * 4 + 3], ROW_OP);
123  dst += stride;
124  }
125 }
126 
127 static int tscc2_decode_mb(TSCC2Context *c, int *q, int vlc_set,
128  uint8_t *dst, int stride, int plane)
129 {
130  GetBitContext *gb = &c->gb;
131  int prev_dc, dc, nc, ac, bpos, val;
132  int i, j, k, l;
133 
134  if (get_bits1(gb)) {
135  if (get_bits1(gb)) {
136  val = get_bits(gb, 8);
137  for (i = 0; i < 8; i++, dst += stride)
138  memset(dst, val, 16);
139  } else {
140  if (get_bits_left(gb) < 16 * 8 * 8)
141  return AVERROR_INVALIDDATA;
142  for (i = 0; i < 8; i++) {
143  for (j = 0; j < 16; j++)
144  dst[j] = get_bits(gb, 8);
145  dst += stride;
146  }
147  }
148  return 0;
149  }
150 
151  prev_dc = 0;
152  for (j = 0; j < 2; j++) {
153  for (k = 0; k < 4; k++) {
154  if (!(j | k)) {
155  dc = get_bits(gb, 8);
156  } else {
157  dc = get_vlc2(gb, c->dc_vlc.table, 9, 2);
158  if (dc == -1)
159  return AVERROR_INVALIDDATA;
160  if (dc == 0x100)
161  dc = get_bits(gb, 8);
162  }
163  dc = (dc + prev_dc) & 0xFF;
164  prev_dc = dc;
165  c->block[0] = dc;
166 
167  nc = get_vlc2(gb, c->nc_vlc[vlc_set].table, 9, 1);
168  if (nc == -1)
169  return AVERROR_INVALIDDATA;
170 
171  bpos = 1;
172  memset(c->block + 1, 0, 15 * sizeof(*c->block));
173  for (l = 0; l < nc; l++) {
174  ac = get_vlc2(gb, c->ac_vlc[vlc_set].table, 9, 2);
175  if (ac == -1)
176  return AVERROR_INVALIDDATA;
177  if (ac == 0x1000)
178  ac = get_bits(gb, 12);
179  bpos += ac & 0xF;
180  if (bpos >= 16)
181  return AVERROR_INVALIDDATA;
182  val = sign_extend(ac >> 4, 8);
183  c->block[ff_zigzag_scan[bpos++]] = val;
184  }
185  tscc2_idct4_put(c->block, q, dst + k * 4, stride);
186  }
187  dst += 4 * stride;
188  }
189  return 0;
190 }
191 
192 static int tscc2_decode_slice(TSCC2Context *c, int mb_y,
193  const uint8_t *buf, int buf_size)
194 {
195  int i, mb_x, q, ret;
196  int off;
197 
198  if ((ret = init_get_bits8(&c->gb, buf, buf_size)) < 0)
199  return ret;
200 
201  for (mb_x = 0; mb_x < c->mb_width; mb_x++) {
202  q = c->slice_quants[mb_x + c->mb_width * mb_y];
203 
204  if (q == 0 || q == 3) // skip block
205  continue;
206  for (i = 0; i < 3; i++) {
207  off = mb_x * 16 + mb_y * 8 * c->pic->linesize[i];
208  ret = tscc2_decode_mb(c, c->q[q - 1], c->quant[q - 1] - 2,
209  c->pic->data[i] + off, c->pic->linesize[i], i);
210  if (ret)
211  return ret;
212  }
213  }
214 
215  return 0;
216 }
217 
218 static int tscc2_decode_frame(AVCodecContext *avctx, void *data,
219  int *got_frame, AVPacket *avpkt)
220 {
221  const uint8_t *buf = avpkt->data;
222  int buf_size = avpkt->size;
223  TSCC2Context *c = avctx->priv_data;
224  GetByteContext gb;
225  uint32_t frame_type, size;
226  int i, val, len, pos = 0;
227  int num_mb = c->mb_width * c->mb_height;
228  int ret;
229 
230  bytestream2_init(&gb, buf, buf_size);
231  frame_type = bytestream2_get_byte(&gb);
232  if (frame_type > 1) {
233  av_log(avctx, AV_LOG_ERROR, "Incorrect frame type %"PRIu32"\n",
234  frame_type);
235  return AVERROR_INVALIDDATA;
236  }
237 
238  if ((ret = ff_reget_buffer(avctx, c->pic)) < 0) {
239  return ret;
240  }
241 
242  if (frame_type == 0) {
243  *got_frame = 1;
244  if ((ret = av_frame_ref(data, c->pic)) < 0)
245  return ret;
246 
247  return buf_size;
248  }
249 
250  if (bytestream2_get_bytes_left(&gb) < 4) {
251  av_log(avctx, AV_LOG_ERROR, "Frame is too short\n");
252  return AVERROR_INVALIDDATA;
253  }
254 
255  c->quant[0] = bytestream2_get_byte(&gb);
256  c->quant[1] = bytestream2_get_byte(&gb);
257  if (c->quant[0] < 2 || c->quant[0] > NUM_VLC_SETS + 1 ||
258  c->quant[1] < 2 || c->quant[1] > NUM_VLC_SETS + 1) {
259  av_log(avctx, AV_LOG_ERROR, "Invalid quantisers %d / %d\n",
260  c->quant[0], c->quant[1]);
261  return AVERROR_INVALIDDATA;
262  }
263 
264  for (i = 0; i < 3; i++) {
265  c->q[0][i] = tscc2_quants[c->quant[0] - 2][i];
266  c->q[1][i] = tscc2_quants[c->quant[1] - 2][i];
267  }
268 
269  bytestream2_skip(&gb, 1);
270 
271  size = bytestream2_get_le32(&gb);
272  if (size > bytestream2_get_bytes_left(&gb)) {
273  av_log(avctx, AV_LOG_ERROR, "Slice properties chunk is too large\n");
274  return AVERROR_INVALIDDATA;
275  }
276 
277  for (i = 0; i < size; i++) {
278  val = bytestream2_get_byte(&gb);
279  len = val & 0x3F;
280  val >>= 6;
281  if (pos + len > num_mb) {
282  av_log(avctx, AV_LOG_ERROR, "Too many slice properties\n");
283  return AVERROR_INVALIDDATA;
284  }
285  memset(c->slice_quants + pos, val, len);
286  pos += len;
287  }
288  if (pos < num_mb) {
289  av_log(avctx, AV_LOG_ERROR, "Too few slice properties (%d / %d)\n",
290  pos, num_mb);
291  return AVERROR_INVALIDDATA;
292  }
293 
294  for (i = 0; i < c->mb_height; i++) {
295  size = bytestream2_peek_byte(&gb);
296  if (size & 1) {
297  size = bytestream2_get_byte(&gb) - 1;
298  } else {
299  size = bytestream2_get_le32(&gb) >> 1;
300  }
301  if (!size) {
302  int skip_row = 1, j, off = i * c->mb_width;
303  for (j = 0; j < c->mb_width; j++) {
304  if (c->slice_quants[off + j] == 1 ||
305  c->slice_quants[off + j] == 2) {
306  skip_row = 0;
307  break;
308  }
309  }
310  if (!skip_row) {
311  av_log(avctx, AV_LOG_ERROR, "Non-skip row with zero size\n");
312  return AVERROR_INVALIDDATA;
313  }
314  }
315  if (bytestream2_get_bytes_left(&gb) < size) {
316  av_log(avctx, AV_LOG_ERROR, "Invalid slice size (%"PRIu32"/%u)\n",
317  size, bytestream2_get_bytes_left(&gb));
318  return AVERROR_INVALIDDATA;
319  }
320  ret = tscc2_decode_slice(c, i, buf + bytestream2_tell(&gb), size);
321  if (ret) {
322  av_log(avctx, AV_LOG_ERROR, "Error decoding slice %d\n", i);
323  return ret;
324  }
325  bytestream2_skip(&gb, size);
326  }
327 
328  *got_frame = 1;
329  if ((ret = av_frame_ref(data, c->pic)) < 0)
330  return ret;
331 
332  /* always report that the buffer was completely consumed */
333  return buf_size;
334 }
335 
337 {
338  TSCC2Context * const c = avctx->priv_data;
339 
340  av_frame_free(&c->pic);
341  av_freep(&c->slice_quants);
342  free_vlcs(c);
343 
344  return 0;
345 }
346 
348 {
349  TSCC2Context * const c = avctx->priv_data;
350  int ret;
351 
352  c->avctx = avctx;
353 
354  avctx->pix_fmt = AV_PIX_FMT_YUV444P;
355 
356  if ((ret = init_vlcs(c)) < 0) {
357  av_log(avctx, AV_LOG_ERROR, "Cannot initialise VLCs\n");
358  return ret;
359  }
360 
361  c->mb_width = FFALIGN(avctx->width, 16) >> 4;
362  c->mb_height = FFALIGN(avctx->height, 8) >> 3;
364  if (!c->slice_quants) {
365  av_log(avctx, AV_LOG_ERROR, "Cannot allocate slice information\n");
366  free_vlcs(c);
367  return AVERROR(ENOMEM);
368  }
369 
370  c->pic = av_frame_alloc();
371  if (!c->pic) {
372  tscc2_decode_end(avctx);
373  return AVERROR(ENOMEM);
374  }
375 
376  return 0;
377 }
378 
380  .name = "tscc2",
381  .long_name = NULL_IF_CONFIG_SMALL("TechSmith Screen Codec 2"),
382  .type = AVMEDIA_TYPE_VIDEO,
383  .id = AV_CODEC_ID_TSCC2,
384  .priv_data_size = sizeof(TSCC2Context),
386  .close = tscc2_decode_end,
388  .capabilities = AV_CODEC_CAP_DR1,
389 };
int plane
Definition: avisynth_c.h:291
const char const char void * val
Definition: avisynth_c.h:634
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
static void tscc2_idct4_put(int *in, int q[3], uint8_t *dst, int stride)
Definition: tscc2.c:104
This structure describes decoded (raw) audio or video data.
Definition: frame.h:184
ptrdiff_t const GLvoid * data
Definition: opengl_enc.c:101
planar YUV 4:4:4, 24bpp, (1 Cr & Cb sample per 1x1 Y samples)
Definition: pixfmt.h:67
static unsigned int get_bits(GetBitContext *s, int n)
Read 1-25 bits.
Definition: get_bits.h:247
static const uint16_t tscc2_dc_vlc_syms[DC_VLC_COUNT]
Definition: tscc2data.h:39
static av_cold int init(AVCodecContext *avctx)
Definition: avrndec.c:35
int ff_init_vlc_sparse(VLC *vlc_arg, int nb_bits, int nb_codes, const void *bits, int bits_wrap, int bits_size, const void *codes, int codes_wrap, int codes_size, const void *symbols, int symbols_wrap, int symbols_size, int flags)
Definition: bitstream.c:275
AVFrame * pic
Definition: tscc2.c:39
int size
Definition: avcodec.h:1581
#define NUM_VLC_SETS
Definition: tscc2data.h:27
int block[16]
Definition: tscc2.c:47
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:1877
static av_always_inline void bytestream2_init(GetByteContext *g, const uint8_t *buf, int buf_size)
Definition: bytestream.h:133
static const int tscc2_ac_vlc_sizes[NUM_VLC_SETS]
Definition: tscc2data.h:902
AVCodec.
Definition: avcodec.h:3542
AVCodecContext * avctx
Definition: tscc2.c:38
VLC nc_vlc[NUM_VLC_SETS]
Definition: tscc2.c:46
#define COL_OP(a, b)
Definition: tscc2.c:101
static av_cold void free_vlcs(TSCC2Context *c)
Definition: tscc2.c:50
int q[2][3]
Definition: tscc2.c:43
static const uint16_t * tscc2_ac_vlc_codes[NUM_VLC_SETS]
Definition: tscc2data.h:913
uint8_t
#define av_cold
Definition: attributes.h:82
#define av_malloc(s)
AVFrame * av_frame_alloc(void)
Allocate an AVFrame and set its fields to default values.
Definition: frame.c:140
static int tscc2_decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
Definition: tscc2.c:218
int av_frame_ref(AVFrame *dst, const AVFrame *src)
Set up a new reference to the data described by the source frame.
Definition: frame.c:374
#define t0
Definition: regdef.h:28
uint8_t * data
Definition: avcodec.h:1580
bitstream reader API header.
ptrdiff_t size
Definition: opengl_enc.c:101
static const uint8_t tscc2_dc_vlc_bits[DC_VLC_COUNT]
Definition: tscc2data.h:57
#define FFALIGN(x, a)
Definition: macros.h:48
#define av_log(a,...)
static int get_bits_left(GetBitContext *gb)
Definition: get_bits.h:568
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
VLC dc_vlc
Definition: tscc2.c:46
#define AVERROR(e)
Definition: error.h:43
static av_always_inline void bytestream2_skip(GetByteContext *g, unsigned int size)
Definition: bytestream.h:164
void av_frame_free(AVFrame **frame)
Free the frame and any dynamically allocated objects in it, e.g.
Definition: frame.c:153
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:176
const uint8_t ff_zigzag_scan[16+1]
Definition: mathtables.c:109
#define t1
Definition: regdef.h:29
static av_always_inline unsigned int bytestream2_get_bytes_left(GetByteContext *g)
Definition: bytestream.h:154
const char * name
Name of the codec implementation.
Definition: avcodec.h:3549
#define t3
Definition: regdef.h:31
Definition: vlc.h:26
int ff_reget_buffer(AVCodecContext *avctx, AVFrame *frame)
Identical in function to av_frame_make_writable(), except it uses ff_get_buffer() to allocate the buf...
Definition: utils.c:977
static av_cold int tscc2_decode_end(AVCodecContext *avctx)
Definition: tscc2.c:336
static int tscc2_decode_mb(TSCC2Context *c, int *q, int vlc_set, uint8_t *dst, int stride, int plane)
Definition: tscc2.c:127
int width
picture width / height.
Definition: avcodec.h:1836
#define DC_VLC_COUNT
Definition: tscc2data.h:37
static av_always_inline int get_vlc2(GetBitContext *s, VLC_TYPE(*table)[2], int bits, int max_depth)
Parse a vlc code.
Definition: get_bits.h:535
static const uint16_t tscc2_nc_vlc_codes[NUM_VLC_SETS][16]
Definition: tscc2data.h:71
#define ROW_OP(a, b)
Definition: tscc2.c:102
#define INIT_VLC_LE
Definition: vlc.h:54
static av_always_inline int bytestream2_tell(GetByteContext *g)
Definition: bytestream.h:188
Libavcodec external API header.
uint8_t * slice_quants
Definition: tscc2.c:41
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
Definition: frame.h:215
static const uint16_t tscc2_quants[NUM_VLC_SETS][3]
Definition: tscc2data.h:29
static int init_get_bits8(GetBitContext *s, const uint8_t *buffer, int byte_size)
Initialize GetBitContext.
Definition: get_bits.h:437
main external API structure.
Definition: avcodec.h:1649
VLC ac_vlc[NUM_VLC_SETS]
Definition: tscc2.c:46
uint8_t pi<< 24) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_U8, uint8_t,(*(constuint8_t *) pi-0x80)*(1.0f/(1<< 7))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_U8, uint8_t,(*(constuint8_t *) pi-0x80)*(1.0/(1<< 7))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_S16, int16_t,(*(constint16_t *) pi >>8)+0x80) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_S16, int16_t,*(constint16_t *) pi *(1.0f/(1<< 15))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_S16, int16_t,*(constint16_t *) pi *(1.0/(1<< 15))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_S32, int32_t,(*(constint32_t *) pi >>24)+0x80) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_S32, int32_t,*(constint32_t *) pi *(1.0f/(1U<< 31))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_S32, int32_t,*(constint32_t *) pi *(1.0/(1U<< 31))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_FLT, float, av_clip_uint8(lrintf(*(constfloat *) pi *(1<< 7))+0x80)) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S16, int16_t, AV_SAMPLE_FMT_FLT, float, av_clip_int16(lrintf(*(constfloat *) pi *(1<< 15)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S32, int32_t, AV_SAMPLE_FMT_FLT, float, av_clipl_int32(llrintf(*(constfloat *) pi *(1U<< 31)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_DBL, double, av_clip_uint8(lrint(*(constdouble *) pi *(1<< 7))+0x80)) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S16, int16_t, AV_SAMPLE_FMT_DBL, double, av_clip_int16(lrint(*(constdouble *) pi *(1<< 15)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S32, int32_t, AV_SAMPLE_FMT_DBL, double, av_clipl_int32(llrint(*(constdouble *) pi *(1U<< 31))))#defineSET_CONV_FUNC_GROUP(ofmt, ifmt) staticvoidset_generic_function(AudioConvert *ac){}voidff_audio_convert_free(AudioConvert **ac){if(!*ac) return;ff_dither_free(&(*ac) ->dc);av_freep(ac);}AudioConvert *ff_audio_convert_alloc(AVAudioResampleContext *avr, enumAVSampleFormatout_fmt, enumAVSampleFormatin_fmt, intchannels, intsample_rate, intapply_map){AudioConvert *ac;intin_planar, out_planar;ac=av_mallocz(sizeof(*ac));if(!ac) returnNULL;ac->avr=avr;ac->out_fmt=out_fmt;ac->in_fmt=in_fmt;ac->channels=channels;ac->apply_map=apply_map;if(avr->dither_method!=AV_RESAMPLE_DITHER_NONE &&av_get_packed_sample_fmt(out_fmt)==AV_SAMPLE_FMT_S16 &&av_get_bytes_per_sample(in_fmt)>2){ac->dc=ff_dither_alloc(avr, out_fmt, in_fmt, channels, sample_rate, apply_map);if(!ac->dc){av_free(ac);returnNULL;}returnac;}in_planar=ff_sample_fmt_is_planar(in_fmt, channels);out_planar=ff_sample_fmt_is_planar(out_fmt, channels);if(in_planar==out_planar){ac->func_type=CONV_FUNC_TYPE_FLAT;ac->planes=in_planar?ac->channels:1;}elseif(in_planar) ac->func_type=CONV_FUNC_TYPE_INTERLEAVE;elseac->func_type=CONV_FUNC_TYPE_DEINTERLEAVE;set_generic_function(ac);if(ARCH_AARCH64) ff_audio_convert_init_aarch64(ac);if(ARCH_ARM) ff_audio_convert_init_arm(ac);if(ARCH_X86) ff_audio_convert_init_x86(ac);returnac;}intff_audio_convert(AudioConvert *ac, AudioData *out, AudioData *in){intuse_generic=1;intlen=in->nb_samples;intp;if(ac->dc){av_log(ac->avr, AV_LOG_TRACE,"%dsamples-audio_convert:%sto%s(dithered)\n", len, av_get_sample_fmt_name(ac->in_fmt), av_get_sample_fmt_name(ac->out_fmt));returnff_convert_dither(ac-> in
void * buf
Definition: avisynth_c.h:553
static unsigned int get_bits1(GetBitContext *s)
Definition: get_bits.h:299
static const uint8_t * tscc2_ac_vlc_bits[NUM_VLC_SETS]
Definition: tscc2data.h:921
static av_cold int tscc2_decode_init(AVCodecContext *avctx)
Definition: tscc2.c:347
static const uint16_t tscc2_dc_vlc_codes[DC_VLC_COUNT]
Definition: tscc2data.h:48
static av_const int sign_extend(int val, unsigned bits)
Definition: mathops.h:139
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:198
#define DCT1D(d0, d1, d2, d3, s0, s1, s2, s3, OP)
Definition: tscc2.c:95
static int decode(AVCodecContext *avctx, void *data, int *got_sub, AVPacket *avpkt)
Definition: ccaption_dec.c:728
int mb_height
Definition: tscc2.c:40
static av_cold int init_vlcs(TSCC2Context *c)
Definition: tscc2.c:61
GLint GLenum GLboolean GLsizei stride
Definition: opengl_enc.c:105
int quant[2]
Definition: tscc2.c:42
common internal api header.
static int tscc2_decode_slice(TSCC2Context *c, int mb_y, const uint8_t *buf, int buf_size)
Definition: tscc2.c:192
static double c[64]
void * priv_data
Definition: avcodec.h:1691
static const uint8_t tscc2_nc_vlc_bits[NUM_VLC_SETS][16]
Definition: tscc2data.h:100
#define DEQUANT(val, q)
Definition: tscc2.c:94
static const uint8_t tscc2_nc_vlc_syms[16]
Definition: tscc2data.h:66
int len
VLC_TYPE(* table)[2]
code, bits
Definition: vlc.h:28
int mb_width
Definition: tscc2.c:40
uint8_t pi<< 24) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_U8, uint8_t,(*(constuint8_t *) pi-0x80)*(1.0f/(1<< 7))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_U8, uint8_t,(*(constuint8_t *) pi-0x80)*(1.0/(1<< 7))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_S16, int16_t,(*(constint16_t *) pi >>8)+0x80) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_S16, int16_t,*(constint16_t *) pi *(1.0f/(1<< 15))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_S16, int16_t,*(constint16_t *) pi *(1.0/(1<< 15))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_S32, int32_t,(*(constint32_t *) pi >>24)+0x80) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_S32, int32_t,*(constint32_t *) pi *(1.0f/(1U<< 31))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_S32, int32_t,*(constint32_t *) pi *(1.0/(1U<< 31))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_FLT, float, av_clip_uint8(lrintf(*(constfloat *) pi *(1<< 7))+0x80)) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S16, int16_t, AV_SAMPLE_FMT_FLT, float, av_clip_int16(lrintf(*(constfloat *) pi *(1<< 15)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S32, int32_t, AV_SAMPLE_FMT_FLT, float, av_clipl_int32(llrintf(*(constfloat *) pi *(1U<< 31)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_DBL, double, av_clip_uint8(lrint(*(constdouble *) pi *(1<< 7))+0x80)) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S16, int16_t, AV_SAMPLE_FMT_DBL, double, av_clip_int16(lrint(*(constdouble *) pi *(1<< 15)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S32, int32_t, AV_SAMPLE_FMT_DBL, double, av_clipl_int32(llrint(*(constdouble *) pi *(1U<< 31))))#defineSET_CONV_FUNC_GROUP(ofmt, ifmt) staticvoidset_generic_function(AudioConvert *ac){}voidff_audio_convert_free(AudioConvert **ac){if(!*ac) return;ff_dither_free(&(*ac) ->dc);av_freep(ac);}AudioConvert *ff_audio_convert_alloc(AVAudioResampleContext *avr, enumAVSampleFormatout_fmt, enumAVSampleFormatin_fmt, intchannels, intsample_rate, intapply_map){AudioConvert *ac;intin_planar, out_planar;ac=av_mallocz(sizeof(*ac));if(!ac) returnNULL;ac->avr=avr;ac->out_fmt=out_fmt;ac->in_fmt=in_fmt;ac->channels=channels;ac->apply_map=apply_map;if(avr->dither_method!=AV_RESAMPLE_DITHER_NONE &&av_get_packed_sample_fmt(out_fmt)==AV_SAMPLE_FMT_S16 &&av_get_bytes_per_sample(in_fmt)>2){ac->dc=ff_dither_alloc(avr, out_fmt, in_fmt, channels, sample_rate, apply_map);if(!ac->dc){av_free(ac);returnNULL;}returnac;}in_planar=ff_sample_fmt_is_planar(in_fmt, channels);out_planar=ff_sample_fmt_is_planar(out_fmt, channels);if(in_planar==out_planar){ac->func_type=CONV_FUNC_TYPE_FLAT;ac->planes=in_planar?ac->channels:1;}elseif(in_planar) ac->func_type=CONV_FUNC_TYPE_INTERLEAVE;elseac->func_type=CONV_FUNC_TYPE_DEINTERLEAVE;set_generic_function(ac);if(ARCH_AARCH64) ff_audio_convert_init_aarch64(ac);if(ARCH_ARM) ff_audio_convert_init_arm(ac);if(ARCH_X86) ff_audio_convert_init_x86(ac);returnac;}intff_audio_convert(AudioConvert *ac, AudioData *out, AudioData *in){intuse_generic=1;intlen=in->nb_samples;intp;if(ac->dc){av_log(ac->avr, AV_LOG_TRACE,"%dsamples-audio_convert:%sto%s(dithered)\n", len, av_get_sample_fmt_name(ac->in_fmt), av_get_sample_fmt_name(ac->out_fmt));returnff_convert_dither(ac-> dc
#define av_freep(p)
static const uint16_t * tscc2_ac_vlc_syms[NUM_VLC_SETS]
Definition: tscc2data.h:906
#define stride
GetBitContext gb
Definition: tscc2.c:44
This structure stores compressed data.
Definition: avcodec.h:1557
void ff_free_vlc(VLC *vlc)
Definition: bitstream.c:360
#define AV_CODEC_CAP_DR1
Codec uses get_buffer() for allocating buffers and supports custom allocators.
Definition: avcodec.h:956
#define t2
Definition: regdef.h:30
AVCodec ff_tscc2_decoder
Definition: tscc2.c:379