Libav
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 Libav.
6  *
7  * Libav 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  * Libav 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 Libav; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21 
27 #define BITSTREAM_READER_LE
28 #include "avcodec.h"
29 #include "get_bits.h"
30 #include "bytestream.h"
31 #include "internal.h"
32 #include "tscc2data.h"
33 
34 typedef struct TSCC2Context {
39  int quant[2];
40  int q[2][3];
42 
44  int block[16];
45 } TSCC2Context;
46 
48 {
49  int i;
50 
51  ff_free_vlc(&c->dc_vlc);
52  for (i = 0; i < NUM_VLC_SETS; i++) {
53  ff_free_vlc(c->nc_vlc + i);
54  ff_free_vlc(c->ac_vlc + i);
55  }
56 }
57 
59 {
60  int i, ret;
61 
63  tscc2_dc_vlc_bits, 1, 1,
64  tscc2_dc_vlc_codes, 2, 2,
66  if (ret)
67  return ret;
68 
69  for (i = 0; i < NUM_VLC_SETS; i++) {
70  ret = ff_init_vlc_sparse(c->nc_vlc + i, 9, 16,
71  tscc2_nc_vlc_bits[i], 1, 1,
72  tscc2_nc_vlc_codes[i], 2, 2,
74  if (ret) {
75  free_vlcs(c);
76  return ret;
77  }
78  ret = ff_init_vlc_sparse(c->ac_vlc + i, 9, tscc2_ac_vlc_sizes[i],
79  tscc2_ac_vlc_bits[i], 1, 1,
80  tscc2_ac_vlc_codes[i], 2, 2,
81  tscc2_ac_vlc_syms[i], 2, 2, INIT_VLC_LE);
82  if (ret) {
83  free_vlcs(c);
84  return ret;
85  }
86  }
87 
88  return 0;
89 }
90 
91 #define DEQUANT(val, q) ((q * val + 0x80) >> 8)
92 #define DCT1D(d0, d1, d2, d3, s0, s1, s2, s3, OP) \
93  OP(d0, 5 * ((s0) + (s1) + (s2)) + 2 * (s3)); \
94  OP(d1, 5 * ((s0) - (s2) - (s3)) + 2 * (s1)); \
95  OP(d2, 5 * ((s0) - (s2) + (s3)) - 2 * (s1)); \
96  OP(d3, 5 * ((s0) - (s1) + (s2)) - 2 * (s3)); \
97 
98 #define COL_OP(a, b) a = b
99 #define ROW_OP(a, b) a = ((b) + 0x20) >> 6
100 
101 static void tscc2_idct4_put(int *in, int q[3], uint8_t *dst, int stride)
102 {
103  int i;
104  int tblk[4 * 4];
105  int t0, t1, t2, t3;
106 
107  for (i = 0; i < 4; i++) {
108  t0 = DEQUANT(q[0 + (i & 1)], in[0 * 4 + i]);
109  t1 = DEQUANT(q[1 + (i & 1)], in[1 * 4 + i]);
110  t2 = DEQUANT(q[0 + (i & 1)], in[2 * 4 + i]);
111  t3 = DEQUANT(q[1 + (i & 1)], in[3 * 4 + i]);
112  DCT1D(tblk[0 * 4 + i], tblk[1 * 4 + i],
113  tblk[2 * 4 + i], tblk[3 * 4 + i],
114  t0, t1, t2, t3, COL_OP);
115  }
116  for (i = 0; i < 4; i++) {
117  DCT1D(dst[0], dst[1], dst[2], dst[3],
118  tblk[i * 4 + 0], tblk[i * 4 + 1],
119  tblk[i * 4 + 2], tblk[i * 4 + 3], ROW_OP);
120  dst += stride;
121  }
122 }
123 
124 static int tscc2_decode_mb(TSCC2Context *c, int *q, int vlc_set,
125  uint8_t *dst, int stride, int plane)
126 {
127  GetBitContext *gb = &c->gb;
128  int prev_dc, dc, nc, ac, bpos, val;
129  int i, j, k, l;
130 
131  if (get_bits1(gb)) {
132  if (get_bits1(gb)) {
133  val = get_bits(gb, 8);
134  for (i = 0; i < 8; i++, dst += stride)
135  memset(dst, val, 16);
136  } else {
137  if (get_bits_left(gb) < 16 * 8 * 8)
138  return AVERROR_INVALIDDATA;
139  for (i = 0; i < 8; i++) {
140  for (j = 0; j < 16; j++)
141  dst[j] = get_bits(gb, 8);
142  dst += stride;
143  }
144  }
145  return 0;
146  }
147 
148  prev_dc = 0;
149  for (j = 0; j < 2; j++) {
150  for (k = 0; k < 4; k++) {
151  if (!(j | k)) {
152  dc = get_bits(gb, 8);
153  } else {
154  dc = get_vlc2(gb, c->dc_vlc.table, 9, 2);
155  if (dc == -1)
156  return AVERROR_INVALIDDATA;
157  if (dc == 0x100)
158  dc = get_bits(gb, 8);
159  }
160  dc = (dc + prev_dc) & 0xFF;
161  prev_dc = dc;
162  c->block[0] = dc;
163 
164  nc = get_vlc2(gb, c->nc_vlc[vlc_set].table, 9, 1);
165  if (nc == -1)
166  return AVERROR_INVALIDDATA;
167 
168  bpos = 1;
169  memset(c->block + 1, 0, 15 * sizeof(*c->block));
170  for (l = 0; l < nc; l++) {
171  ac = get_vlc2(gb, c->ac_vlc[vlc_set].table, 9, 2);
172  if (ac == -1)
173  return AVERROR_INVALIDDATA;
174  if (ac == 0x1000)
175  ac = get_bits(gb, 12);
176  bpos += ac & 0xF;
177  if (bpos >= 16)
178  return AVERROR_INVALIDDATA;
179  val = sign_extend(ac >> 4, 8);
180  c->block[tscc2_zigzag[bpos++]] = val;
181  }
182  tscc2_idct4_put(c->block, q, dst + k * 4, stride);
183  }
184  dst += 4 * stride;
185  }
186  return 0;
187 }
188 
189 static int tscc2_decode_slice(TSCC2Context *c, int mb_y,
190  const uint8_t *buf, int buf_size)
191 {
192  int i, mb_x, q, ret;
193  int off;
194 
195  init_get_bits(&c->gb, buf, buf_size * 8);
196 
197  for (mb_x = 0; mb_x < c->mb_width; mb_x++) {
198  q = c->slice_quants[mb_x + c->mb_width * mb_y];
199 
200  if (q == 0 || q == 3) // skip block
201  continue;
202  for (i = 0; i < 3; i++) {
203  off = mb_x * 16 + mb_y * 8 * c->pic->linesize[i];
204  ret = tscc2_decode_mb(c, c->q[q - 1], c->quant[q - 1] - 2,
205  c->pic->data[i] + off, c->pic->linesize[i], i);
206  if (ret)
207  return ret;
208  }
209  }
210 
211  return 0;
212 }
213 
214 static int tscc2_decode_frame(AVCodecContext *avctx, void *data,
215  int *got_frame, AVPacket *avpkt)
216 {
217  const uint8_t *buf = avpkt->data;
218  int buf_size = avpkt->size;
219  TSCC2Context *c = avctx->priv_data;
220  GetByteContext gb;
221  uint32_t frame_type, size;
222  int i, val, len, pos = 0;
223  int num_mb = c->mb_width * c->mb_height;
224  int ret;
225 
226  bytestream2_init(&gb, buf, buf_size);
227  frame_type = bytestream2_get_byte(&gb);
228  if (frame_type > 1) {
229  av_log(avctx, AV_LOG_ERROR, "Incorrect frame type %d\n", frame_type);
230  return AVERROR_INVALIDDATA;
231  }
232 
233  if ((ret = ff_reget_buffer(avctx, c->pic)) < 0) {
234  av_log(avctx, AV_LOG_ERROR, "reget_buffer() failed\n");
235  return ret;
236  }
237 
238  if (frame_type == 0) {
239  *got_frame = 1;
240  if ((ret = av_frame_ref(data, c->pic)) < 0)
241  return ret;
242 
243  return buf_size;
244  }
245 
246  if (bytestream2_get_bytes_left(&gb) < 4) {
247  av_log(avctx, AV_LOG_ERROR, "Frame is too short\n");
248  return AVERROR_INVALIDDATA;
249  }
250 
251  c->quant[0] = bytestream2_get_byte(&gb);
252  c->quant[1] = bytestream2_get_byte(&gb);
253  if (c->quant[0] < 2 || c->quant[0] > NUM_VLC_SETS + 1 ||
254  c->quant[1] < 2 || c->quant[1] > NUM_VLC_SETS + 1) {
255  av_log(avctx, AV_LOG_ERROR, "Invalid quantisers %d / %d\n",
256  c->quant[0], c->quant[1]);
257  return AVERROR_INVALIDDATA;
258  }
259 
260  for (i = 0; i < 3; i++) {
261  c->q[0][i] = tscc2_quants[c->quant[0] - 2][i];
262  c->q[1][i] = tscc2_quants[c->quant[1] - 2][i];
263  }
264 
265  bytestream2_skip(&gb, 1);
266 
267  size = bytestream2_get_le32(&gb);
268  if (size > bytestream2_get_bytes_left(&gb)) {
269  av_log(avctx, AV_LOG_ERROR, "Slice properties chunk is too large\n");
270  return AVERROR_INVALIDDATA;
271  }
272 
273  for (i = 0; i < size; i++) {
274  val = bytestream2_get_byte(&gb);
275  len = val & 0x3F;
276  val >>= 6;
277  if (pos + len > num_mb) {
278  av_log(avctx, AV_LOG_ERROR, "Too many slice properties\n");
279  return AVERROR_INVALIDDATA;
280  }
281  memset(c->slice_quants + pos, val, len);
282  pos += len;
283  }
284  if (pos < num_mb) {
285  av_log(avctx, AV_LOG_ERROR, "Too few slice properties (%d / %d)\n",
286  pos, num_mb);
287  return AVERROR_INVALIDDATA;
288  }
289 
290  for (i = 0; i < c->mb_height; i++) {
291  size = bytestream2_peek_byte(&gb);
292  if (size & 1) {
293  size = bytestream2_get_byte(&gb) - 1;
294  } else {
295  size = bytestream2_get_le32(&gb) >> 1;
296  }
297  if (!size) {
298  int skip_row = 1, j, off = i * c->mb_width;
299  for (j = 0; j < c->mb_width; j++) {
300  if (c->slice_quants[off + j] == 1 ||
301  c->slice_quants[off + j] == 2) {
302  skip_row = 0;
303  break;
304  }
305  }
306  if (!skip_row) {
307  av_log(avctx, AV_LOG_ERROR, "Non-skip row with zero size\n");
308  return AVERROR_INVALIDDATA;
309  }
310  }
311  if (bytestream2_get_bytes_left(&gb) < size) {
312  av_log(avctx, AV_LOG_ERROR, "Invalid slice size (%d/%d)\n",
313  size, bytestream2_get_bytes_left(&gb));
314  return AVERROR_INVALIDDATA;
315  }
316  ret = tscc2_decode_slice(c, i, buf + bytestream2_tell(&gb), size);
317  if (ret) {
318  av_log(avctx, AV_LOG_ERROR, "Error decoding slice %d\n", i);
319  return ret;
320  }
321  bytestream2_skip(&gb, size);
322  }
323 
324  *got_frame = 1;
325  if ((ret = av_frame_ref(data, c->pic)) < 0)
326  return ret;
327 
328  /* always report that the buffer was completely consumed */
329  return buf_size;
330 }
331 
333 {
334  TSCC2Context * const c = avctx->priv_data;
335 
336  av_frame_free(&c->pic);
337  av_freep(&c->slice_quants);
338  free_vlcs(c);
339 
340  return 0;
341 }
342 
344 {
345  TSCC2Context * const c = avctx->priv_data;
346  int ret;
347 
348  c->avctx = avctx;
349 
350  avctx->pix_fmt = AV_PIX_FMT_YUV444P;
351 
352  if ((ret = init_vlcs(c)) < 0) {
353  av_log(avctx, AV_LOG_ERROR, "Cannot initialise VLCs\n");
354  return ret;
355  }
356 
357  c->mb_width = FFALIGN(avctx->width, 16) >> 4;
358  c->mb_height = FFALIGN(avctx->height, 8) >> 3;
360  if (!c->slice_quants) {
361  av_log(avctx, AV_LOG_ERROR, "Cannot allocate slice information\n");
362  free_vlcs(c);
363  return AVERROR(ENOMEM);
364  }
365 
366  c->pic = av_frame_alloc();
367  if (!c->pic) {
368  tscc2_decode_end(avctx);
369  return AVERROR(ENOMEM);
370  }
371 
372  return 0;
373 }
374 
376  .name = "tscc2",
377  .long_name = NULL_IF_CONFIG_SMALL("TechSmith Screen Codec 2"),
378  .type = AVMEDIA_TYPE_VIDEO,
379  .id = AV_CODEC_ID_TSCC2,
380  .priv_data_size = sizeof(TSCC2Context),
384  .capabilities = CODEC_CAP_DR1,
385 };
void * av_malloc(size_t size)
Allocate a block of size bytes with alignment suitable for all memory accesses (including vectors if ...
Definition: mem.c:62
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:54
int size
static void tscc2_idct4_put(int *in, int q[3], uint8_t *dst, int stride)
Definition: tscc2.c:101
This structure describes decoded (raw) audio or video data.
Definition: frame.h:107
planar YUV 4:4:4, 24bpp, (1 Cr & Cb sample per 1x1 Y samples)
Definition: pixfmt.h:70
static unsigned int get_bits(GetBitContext *s, int n)
Read 1-25 bits.
Definition: get_bits.h:240
static const uint16_t tscc2_dc_vlc_syms[DC_VLC_COUNT]
Definition: tscc2data.h:46
AVFrame * pic
Definition: tscc2.c:36
int size
Definition: avcodec.h:974
#define NUM_VLC_SETS
Definition: tscc2data.h:34
int block[16]
Definition: tscc2.c:44
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:1247
static av_always_inline void bytestream2_init(GetByteContext *g, const uint8_t *buf, int buf_size)
Definition: bytestream.h:130
static const int tscc2_ac_vlc_sizes[NUM_VLC_SETS]
Definition: tscc2data.h:909
int stride
Definition: mace.c:144
AVCodec.
Definition: avcodec.h:2755
AVCodecContext * avctx
Definition: tscc2.c:35
#define FFALIGN(x, a)
Definition: common.h:62
void av_freep(void *arg)
Free a memory block which has been allocated with av_malloc(z)() or av_realloc() and set the pointer ...
Definition: mem.c:198
VLC nc_vlc[NUM_VLC_SETS]
Definition: tscc2.c:43
#define COL_OP(a, b)
Definition: tscc2.c:98
static av_cold void free_vlcs(TSCC2Context *c)
Definition: tscc2.c:47
int q[2][3]
Definition: tscc2.c:40
static int decode(MimicContext *ctx, int quality, int num_coeffs, int is_iframe)
Definition: mimic.c:269
static const uint16_t * tscc2_ac_vlc_codes[NUM_VLC_SETS]
Definition: tscc2data.h:920
int ff_init_vlc_sparse(VLC *vlc, 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:266
uint8_t
#define av_cold
Definition: attributes.h:66
AVFrame * av_frame_alloc(void)
Allocate an AVFrame and set its fields to default values.
Definition: frame.c:43
static int tscc2_decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
Definition: tscc2.c:214
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:174
#define CODEC_CAP_DR1
Codec uses get_buffer() for allocating buffers and supports custom allocators.
Definition: avcodec.h:711
const char data[16]
Definition: mxf.c:66
uint8_t * data
Definition: avcodec.h:973
bitstream reader API header.
static const uint8_t tscc2_dc_vlc_bits[DC_VLC_COUNT]
Definition: tscc2data.h:64
static int get_bits_left(GetBitContext *gb)
Definition: get_bits.h:555
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:123
VLC dc_vlc
Definition: tscc2.c:43
#define AVERROR(e)
Definition: error.h:43
static av_always_inline void bytestream2_skip(GetByteContext *g, unsigned int size)
Definition: bytestream.h:159
void av_frame_free(AVFrame **frame)
Free the frame and any dynamically allocated objects in it, e.g.
Definition: frame.c:55
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:142
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=av_sample_fmt_is_planar(in_fmt);out_planar=av_sample_fmt_is_planar(out_fmt);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_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_dlog(ac->avr,"%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
static av_always_inline unsigned int bytestream2_get_bytes_left(GetByteContext *g)
Definition: bytestream.h:149
void av_log(void *avcl, int level, const char *fmt,...)
Definition: log.c:148
const char * name
Name of the codec implementation.
Definition: avcodec.h:2762
Definition: get_bits.h:64
int off
Definition: dsputil_bfin.c:29
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:755
static av_cold int tscc2_decode_end(AVCodecContext *avctx)
Definition: tscc2.c:332
static int tscc2_decode_mb(TSCC2Context *c, int *q, int vlc_set, uint8_t *dst, int stride, int plane)
Definition: tscc2.c:124
int width
picture width / height.
Definition: avcodec.h:1217
#define DC_VLC_COUNT
Definition: tscc2data.h:44
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:522
static const uint16_t tscc2_nc_vlc_codes[NUM_VLC_SETS][16]
Definition: tscc2data.h:78
#define ROW_OP(a, b)
Definition: tscc2.c:99
static av_always_inline int bytestream2_tell(GetByteContext *g)
Definition: bytestream.h:183
Libavcodec external API header.
uint8_t * slice_quants
Definition: tscc2.c:38
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
Definition: frame.h:125
static const uint16_t tscc2_quants[NUM_VLC_SETS][3]
Definition: tscc2data.h:36
main external API structure.
Definition: avcodec.h:1054
static void close(AVCodecParserContext *s)
Definition: h264_parser.c:489
VLC ac_vlc[NUM_VLC_SETS]
Definition: tscc2.c:43
static const uint8_t tscc2_zigzag[16]
Definition: tscc2data.h:27
#define INIT_VLC_LE
Definition: get_bits.h:440
static unsigned int get_bits1(GetBitContext *s)
Definition: get_bits.h:271
static int init_get_bits(GetBitContext *s, const uint8_t *buffer, int bit_size)
Initialize GetBitContext.
Definition: get_bits.h:375
static const uint8_t * tscc2_ac_vlc_bits[NUM_VLC_SETS]
Definition: tscc2data.h:928
static av_cold int tscc2_decode_init(AVCodecContext *avctx)
Definition: tscc2.c:343
static const uint16_t tscc2_dc_vlc_codes[DC_VLC_COUNT]
Definition: tscc2data.h:55
static av_const int sign_extend(int val, unsigned bits)
Definition: mathops.h:123
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:113
#define DCT1D(d0, d1, d2, d3, s0, s1, s2, s3, OP)
Definition: tscc2.c:92
int mb_height
Definition: tscc2.c:37
static av_cold int init_vlcs(TSCC2Context *c)
Definition: tscc2.c:58
int quant[2]
Definition: tscc2.c:39
common internal api header.
static int tscc2_decode_slice(TSCC2Context *c, int mb_y, const uint8_t *buf, int buf_size)
Definition: tscc2.c:189
static av_cold int init(AVCodecParserContext *s)
Definition: h264_parser.c:498
void * priv_data
Definition: avcodec.h:1090
static const uint8_t tscc2_nc_vlc_bits[NUM_VLC_SETS][16]
Definition: tscc2data.h:107
#define DEQUANT(val, q)
Definition: tscc2.c:91
static const uint8_t tscc2_nc_vlc_syms[16]
Definition: tscc2data.h:73
int len
VLC_TYPE(* table)[2]
code, bits
Definition: get_bits.h:66
int mb_width
Definition: tscc2.c:37
static const uint16_t * tscc2_ac_vlc_syms[NUM_VLC_SETS]
Definition: tscc2data.h:913
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=av_sample_fmt_is_planar(in_fmt);out_planar=av_sample_fmt_is_planar(out_fmt);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_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_dlog(ac->avr,"%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
GetBitContext gb
Definition: tscc2.c:41
This structure stores compressed data.
Definition: avcodec.h:950
void ff_free_vlc(VLC *vlc)
Definition: bitstream.c:333
AVCodec ff_tscc2_decoder
Definition: tscc2.c:375