lavc: export DV profile API used by muxer/demuxer as public
[libav.git] / libavcodec / dvdec.c
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1/*
2 * DV decoder
3 * Copyright (c) 2002 Fabrice Bellard
4 * Copyright (c) 2004 Roman Shaposhnik
5 *
6 * 50 Mbps (DVCPRO50) support
7 * Copyright (c) 2006 Daniel Maas <dmaas@maasdigital.com>
8 *
9 * 100 Mbps (DVCPRO HD) support
10 * Initial code by Daniel Maas <dmaas@maasdigital.com> (funded by BBC R&D)
11 * Final code by Roman Shaposhnik
12 *
13 * Many thanks to Dan Dennedy <dan@dennedy.org> for providing wealth
14 * of DV technical info.
15 *
16 * This file is part of Libav.
17 *
18 * Libav is free software; you can redistribute it and/or
19 * modify it under the terms of the GNU Lesser General Public
20 * License as published by the Free Software Foundation; either
21 * version 2.1 of the License, or (at your option) any later version.
22 *
23 * Libav is distributed in the hope that it will be useful,
24 * but WITHOUT ANY WARRANTY; without even the implied warranty of
25 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
26 * Lesser General Public License for more details.
27 *
28 * You should have received a copy of the GNU Lesser General Public
29 * License along with Libav; if not, write to the Free Software
30 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
31 */
32
33/**
34 * @file
35 * DV decoder
36 */
37
218aefce 38#include "libavutil/internal.h"
9e500efd 39#include "libavutil/imgutils.h"
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40#include "libavutil/pixdesc.h"
41#include "avcodec.h"
e3fcb143 42#include "idctdsp.h"
594d4d5d 43#include "internal.h"
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44#include "get_bits.h"
45#include "put_bits.h"
46#include "simple_idct.h"
47#include "dvdata.h"
3cbe1126 48#include "dv.h"
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49
50typedef struct BlockInfo {
51 const uint32_t *factor_table;
52 const uint8_t *scan_table;
53 uint8_t pos; /* position in block */
88bd7fdc 54 void (*idct_put)(uint8_t *dest, int line_size, int16_t *block);
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55 uint8_t partial_bit_count;
56 uint32_t partial_bit_buffer;
57 int shift_offset;
58} BlockInfo;
59
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60static const int dv_iweight_bits = 14;
61
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62static av_cold int dvvideo_decode_init(AVCodecContext *avctx)
63{
64 DVVideoContext *s = avctx->priv_data;
e3fcb143 65 IDCTDSPContext idsp;
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66 int i;
67
e3fcb143 68 ff_idctdsp_init(&idsp, avctx);
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69
70 for (i = 0; i < 64; i++)
e3fcb143 71 s->dv_zigzag[0][i] = idsp.idct_permutation[ff_zigzag_direct[i]];
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72
73 memcpy(s->dv_zigzag[1], ff_dv_zigzag248_direct, sizeof(s->dv_zigzag[1]));
74
e3fcb143 75 s->idct_put[0] = idsp.idct_put;
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76 s->idct_put[1] = ff_simple_idct248_put;
77
78 return ff_dvvideo_init(avctx);
79}
80
d724fe66 81/* decode AC coefficients */
88bd7fdc 82static void dv_decode_ac(GetBitContext *gb, BlockInfo *mb, int16_t *block)
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83{
84 int last_index = gb->size_in_bits;
85 const uint8_t *scan_table = mb->scan_table;
86 const uint32_t *factor_table = mb->factor_table;
87 int pos = mb->pos;
88 int partial_bit_count = mb->partial_bit_count;
89 int level, run, vlc_len, index;
90
91 OPEN_READER(re, gb);
92 UPDATE_CACHE(re, gb);
93
94 /* if we must parse a partial VLC, we do it here */
95 if (partial_bit_count > 0) {
96 re_cache = re_cache >> partial_bit_count | mb->partial_bit_buffer;
97 re_index -= partial_bit_count;
98 mb->partial_bit_count = 0;
99 }
100
101 /* get the AC coefficients until last_index is reached */
102 for (;;) {
103 av_dlog(NULL, "%2d: bits=%04x index=%d\n", pos, SHOW_UBITS(re, gb, 16),
104 re_index);
105 /* our own optimized GET_RL_VLC */
106 index = NEG_USR32(re_cache, TEX_VLC_BITS);
107 vlc_len = ff_dv_rl_vlc[index].len;
108 if (vlc_len < 0) {
109 index = NEG_USR32((unsigned)re_cache << TEX_VLC_BITS, -vlc_len) +
110 ff_dv_rl_vlc[index].level;
111 vlc_len = TEX_VLC_BITS - vlc_len;
112 }
113 level = ff_dv_rl_vlc[index].level;
114 run = ff_dv_rl_vlc[index].run;
115
116 /* gotta check if we're still within gb boundaries */
117 if (re_index + vlc_len > last_index) {
118 /* should be < 16 bits otherwise a codeword could have been parsed */
119 mb->partial_bit_count = last_index - re_index;
120 mb->partial_bit_buffer = re_cache & ~(-1u >> mb->partial_bit_count);
121 re_index = last_index;
122 break;
123 }
124 re_index += vlc_len;
125
126 av_dlog(NULL, "run=%d level=%d\n", run, level);
127 pos += run;
128 if (pos >= 64)
129 break;
130
131 level = (level * factor_table[pos] + (1 << (dv_iweight_bits - 1))) >> dv_iweight_bits;
132 block[scan_table[pos]] = level;
133
134 UPDATE_CACHE(re, gb);
135 }
136 CLOSE_READER(re, gb);
137 mb->pos = pos;
138}
139
140static inline void bit_copy(PutBitContext *pb, GetBitContext *gb)
141{
142 int bits_left = get_bits_left(gb);
143 while (bits_left >= MIN_CACHE_BITS) {
144 put_bits(pb, MIN_CACHE_BITS, get_bits(gb, MIN_CACHE_BITS));
145 bits_left -= MIN_CACHE_BITS;
146 }
147 if (bits_left > 0) {
148 put_bits(pb, bits_left, get_bits(gb, bits_left));
149 }
150}
151
152/* mb_x and mb_y are in units of 8 pixels */
153static int dv_decode_video_segment(AVCodecContext *avctx, void *arg)
154{
155 DVVideoContext *s = avctx->priv_data;
156 DVwork_chunk *work_chunk = arg;
157 int quant, dc, dct_mode, class1, j;
158 int mb_index, mb_x, mb_y, last_index;
159 int y_stride, linesize;
88bd7fdc 160 int16_t *block, *block1;
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161 int c_offset;
162 uint8_t *y_ptr;
163 const uint8_t *buf_ptr;
164 PutBitContext pb, vs_pb;
165 GetBitContext gb;
166 BlockInfo mb_data[5 * DV_MAX_BPM], *mb, *mb1;
88bd7fdc 167 LOCAL_ALIGNED_16(int16_t, sblock, [5*DV_MAX_BPM], [64]);
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168 LOCAL_ALIGNED_16(uint8_t, mb_bit_buffer, [ 80 + FF_INPUT_BUFFER_PADDING_SIZE]); /* allow some slack */
169 LOCAL_ALIGNED_16(uint8_t, vs_bit_buffer, [5*80 + FF_INPUT_BUFFER_PADDING_SIZE]); /* allow some slack */
2bcbd984 170 const int log2_blocksize = 3;
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171 int is_field_mode[5];
172
173 assert((((int)mb_bit_buffer) & 7) == 0);
174 assert((((int)vs_bit_buffer) & 7) == 0);
175
176 memset(sblock, 0, 5*DV_MAX_BPM*sizeof(*sblock));
177
178 /* pass 1: read DC and AC coefficients in blocks */
179 buf_ptr = &s->buf[work_chunk->buf_offset*80];
180 block1 = &sblock[0][0];
181 mb1 = mb_data;
182 init_put_bits(&vs_pb, vs_bit_buffer, 5 * 80);
183 for (mb_index = 0; mb_index < 5; mb_index++, mb1 += s->sys->bpm, block1 += s->sys->bpm * 64) {
184 /* skip header */
185 quant = buf_ptr[3] & 0x0f;
186 buf_ptr += 4;
187 init_put_bits(&pb, mb_bit_buffer, 80);
188 mb = mb1;
189 block = block1;
190 is_field_mode[mb_index] = 0;
191 for (j = 0; j < s->sys->bpm; j++) {
192 last_index = s->sys->block_sizes[j];
193 init_get_bits(&gb, buf_ptr, last_index);
194
195 /* get the DC */
196 dc = get_sbits(&gb, 9);
197 dct_mode = get_bits1(&gb);
198 class1 = get_bits(&gb, 2);
199 if (DV_PROFILE_IS_HD(s->sys)) {
200 mb->idct_put = s->idct_put[0];
201 mb->scan_table = s->dv_zigzag[0];
650dee63 202 mb->factor_table = &s->idct_factor[(j >= 4)*4*16*64 + class1*16*64 + quant*64];
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203 is_field_mode[mb_index] |= !j && dct_mode;
204 } else {
205 mb->idct_put = s->idct_put[dct_mode && log2_blocksize == 3];
206 mb->scan_table = s->dv_zigzag[dct_mode];
650dee63 207 mb->factor_table = &s->idct_factor[(class1 == 3)*2*22*64 + dct_mode*22*64 +
a3dbd459 208 (quant + ff_dv_quant_offset[class1])*64];
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209 }
210 dc = dc << 2;
211 /* convert to unsigned because 128 is not added in the
212 standard IDCT */
213 dc += 1024;
214 block[0] = dc;
215 buf_ptr += last_index >> 3;
216 mb->pos = 0;
217 mb->partial_bit_count = 0;
218
219 av_dlog(avctx, "MB block: %d, %d ", mb_index, j);
220 dv_decode_ac(&gb, mb, block);
221
222 /* write the remaining bits in a new buffer only if the
223 block is finished */
224 if (mb->pos >= 64)
225 bit_copy(&pb, &gb);
226
227 block += 64;
228 mb++;
229 }
230
231 /* pass 2: we can do it just after */
232 av_dlog(avctx, "***pass 2 size=%d MB#=%d\n", put_bits_count(&pb), mb_index);
233 block = block1;
234 mb = mb1;
235 init_get_bits(&gb, mb_bit_buffer, put_bits_count(&pb));
236 put_bits32(&pb, 0); // padding must be zeroed
237 flush_put_bits(&pb);
238 for (j = 0; j < s->sys->bpm; j++, block += 64, mb++) {
239 if (mb->pos < 64 && get_bits_left(&gb) > 0) {
240 dv_decode_ac(&gb, mb, block);
241 /* if still not finished, no need to parse other blocks */
242 if (mb->pos < 64)
243 break;
244 }
245 }
246 /* all blocks are finished, so the extra bytes can be used at
247 the video segment level */
248 if (j >= s->sys->bpm)
249 bit_copy(&vs_pb, &gb);
250 }
251
252 /* we need a pass over the whole video segment */
253 av_dlog(avctx, "***pass 3 size=%d\n", put_bits_count(&vs_pb));
254 block = &sblock[0][0];
255 mb = mb_data;
256 init_get_bits(&gb, vs_bit_buffer, put_bits_count(&vs_pb));
257 put_bits32(&vs_pb, 0); // padding must be zeroed
258 flush_put_bits(&vs_pb);
259 for (mb_index = 0; mb_index < 5; mb_index++) {
260 for (j = 0; j < s->sys->bpm; j++) {
261 if (mb->pos < 64) {
262 av_dlog(avctx, "start %d:%d\n", mb_index, j);
263 dv_decode_ac(&gb, mb, block);
264 }
265 if (mb->pos >= 64 && mb->pos < 127)
266 av_log(avctx, AV_LOG_ERROR, "AC EOB marker is absent pos=%d\n", mb->pos);
267 block += 64;
268 mb++;
269 }
270 }
271
272 /* compute idct and place blocks */
273 block = &sblock[0][0];
274 mb = mb_data;
275 for (mb_index = 0; mb_index < 5; mb_index++) {
276 dv_calculate_mb_xy(s, work_chunk, mb_index, &mb_x, &mb_y);
277
278 /* idct_put'ting luminance */
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279 if ((s->sys->pix_fmt == AV_PIX_FMT_YUV420P) ||
280 (s->sys->pix_fmt == AV_PIX_FMT_YUV411P && mb_x >= (704 / 8)) ||
d724fe66 281 (s->sys->height >= 720 && mb_y != 134)) {
d4f1188d 282 y_stride = (s->frame->linesize[0] << ((!is_field_mode[mb_index]) * log2_blocksize));
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283 } else {
284 y_stride = (2 << log2_blocksize);
285 }
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286 y_ptr = s->frame->data[0] + ((mb_y * s->frame->linesize[0] + mb_x) << log2_blocksize);
287 linesize = s->frame->linesize[0] << is_field_mode[mb_index];
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288 mb[0] .idct_put(y_ptr , linesize, block + 0*64);
289 if (s->sys->video_stype == 4) { /* SD 422 */
290 mb[2].idct_put(y_ptr + (1 << log2_blocksize) , linesize, block + 2*64);
291 } else {
292 mb[1].idct_put(y_ptr + (1 << log2_blocksize) , linesize, block + 1*64);
293 mb[2].idct_put(y_ptr + y_stride, linesize, block + 2*64);
294 mb[3].idct_put(y_ptr + (1 << log2_blocksize) + y_stride, linesize, block + 3*64);
295 }
296 mb += 4;
297 block += 4*64;
298
299 /* idct_put'ting chrominance */
d4f1188d 300 c_offset = (((mb_y >> (s->sys->pix_fmt == AV_PIX_FMT_YUV420P)) * s->frame->linesize[1] +
716d413c 301 (mb_x >> ((s->sys->pix_fmt == AV_PIX_FMT_YUV411P) ? 2 : 1))) << log2_blocksize);
d724fe66 302 for (j = 2; j; j--) {
d4f1188d 303 uint8_t *c_ptr = s->frame->data[j] + c_offset;
716d413c 304 if (s->sys->pix_fmt == AV_PIX_FMT_YUV411P && mb_x >= (704 / 8)) {
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305 uint64_t aligned_pixels[64/8];
306 uint8_t *pixels = (uint8_t*)aligned_pixels;
307 uint8_t *c_ptr1, *ptr1;
308 int x, y;
309 mb->idct_put(pixels, 8, block);
d4f1188d 310 for (y = 0; y < (1 << log2_blocksize); y++, c_ptr += s->frame->linesize[j], pixels += 8) {
d724fe66 311 ptr1 = pixels + (1 << (log2_blocksize - 1));
d4f1188d 312 c_ptr1 = c_ptr + (s->frame->linesize[j] << log2_blocksize);
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313 for (x = 0; x < (1 << (log2_blocksize - 1)); x++) {
314 c_ptr[x] = pixels[x];
315 c_ptr1[x] = ptr1[x];
316 }
317 }
318 block += 64; mb++;
319 } else {
320 y_stride = (mb_y == 134) ? (1 << log2_blocksize) :
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321 s->frame->linesize[j] << ((!is_field_mode[mb_index]) * log2_blocksize);
322 linesize = s->frame->linesize[j] << is_field_mode[mb_index];
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323 (mb++)-> idct_put(c_ptr , linesize, block); block += 64;
324 if (s->sys->bpm == 8) {
325 (mb++)->idct_put(c_ptr + y_stride, linesize, block); block += 64;
326 }
327 }
328 }
329 }
330 return 0;
331}
332
333/* NOTE: exactly one frame must be given (120000 bytes for NTSC,
334 144000 bytes for PAL - or twice those for 50Mbps) */
335static int dvvideo_decode_frame(AVCodecContext *avctx,
df9b9567 336 void *data, int *got_frame,
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337 AVPacket *avpkt)
338{
b2e92e94 339 uint8_t *buf = avpkt->data;
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340 int buf_size = avpkt->size;
341 DVVideoContext *s = avctx->priv_data;
342 const uint8_t* vsc_pack;
caeed8de 343 int apt, is16_9, ret;
f6ee61fb 344 const AVDVProfile *sys;
d724fe66 345
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346 sys = avpriv_dv_frame_profile(s->sys, buf, buf_size);
347 if (!sys || buf_size < sys->frame_size) {
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348 av_log(avctx, AV_LOG_ERROR, "could not find dv frame profile\n");
349 return -1; /* NOTE: we only accept several full frames */
350 }
351
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352 if (sys != s->sys) {
353 ret = ff_dv_init_dynamic_tables(s, sys);
354 if (ret < 0) {
355 av_log(avctx, AV_LOG_ERROR, "Error initializing the work tables.\n");
356 return ret;
357 }
358 s->sys = sys;
359 }
360
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361 s->frame = data;
362 s->frame->key_frame = 1;
363 s->frame->pict_type = AV_PICTURE_TYPE_I;
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364 avctx->pix_fmt = s->sys->pix_fmt;
365 avctx->time_base = s->sys->time_base;
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366
367 ret = ff_set_dimensions(avctx, s->sys->width, s->sys->height);
368 if (ret < 0)
369 return ret;
370
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371 /* Determine the codec's sample_aspect ratio from the packet */
372 vsc_pack = buf + 80*5 + 48 + 5;
373 if ( *vsc_pack == dv_video_control ) {
374 apt = buf[4] & 0x07;
375 is16_9 = (vsc_pack && ((vsc_pack[2] & 0x07) == 0x02 || (!apt && (vsc_pack[2] & 0x07) == 0x07)));
376 ff_set_sar(avctx, s->sys->sar[is16_9]);
377 }
378
d4f1188d 379 if (ff_get_buffer(avctx, s->frame, 0) < 0) {
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380 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
381 return -1;
382 }
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383 s->frame->interlaced_frame = 1;
384 s->frame->top_field_first = 0;
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385
386 s->buf = buf;
650dee63 387 avctx->execute(avctx, dv_decode_video_segment, s->work_chunks, NULL,
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388 dv_work_pool_size(s->sys), sizeof(DVwork_chunk));
389
390 emms_c();
391
392 /* return image */
df9b9567 393 *got_frame = 1;
d724fe66 394
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395 return s->sys->frame_size;
396}
397
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398AVCodec ff_dvvideo_decoder = {
399 .name = "dvvideo",
b2bed932 400 .long_name = NULL_IF_CONFIG_SMALL("DV (Digital Video)"),
d724fe66 401 .type = AVMEDIA_TYPE_VIDEO,
36ef5369 402 .id = AV_CODEC_ID_DVVIDEO,
d724fe66 403 .priv_data_size = sizeof(DVVideoContext),
e63b818d 404 .init = dvvideo_decode_init,
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405 .decode = dvvideo_decode_frame,
406 .capabilities = CODEC_CAP_DR1 | CODEC_CAP_SLICE_THREADS,
d724fe66 407};