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path: root/libavcodec/rawdec.c (plain)
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1/*
2 * Raw Video Decoder
3 * Copyright (c) 2001 Fabrice Bellard
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 * Raw Video Decoder
25 */
26
27#include "avcodec.h"
28#include "bswapdsp.h"
29#include "get_bits.h"
30#include "internal.h"
31#include "raw.h"
32#include "libavutil/avassert.h"
33#include "libavutil/buffer.h"
34#include "libavutil/common.h"
35#include "libavutil/intreadwrite.h"
36#include "libavutil/imgutils.h"
37#include "libavutil/opt.h"
38
39typedef struct RawVideoContext {
40 AVClass *av_class;
41 AVBufferRef *palette;
42 int frame_size; /* size of the frame in bytes */
43 int flip;
44 int is_1_2_4_8_bpp; // 1, 2, 4 and 8 bpp in avi/mov, 1 and 8 bpp in nut
45 int is_mono;
46 int is_pal8;
47 int is_nut_mono;
48 int is_nut_pal8;
49 int is_yuv2;
50 int is_lt_16bpp; // 16bpp pixfmt and bits_per_coded_sample < 16
51 int tff;
52
53 BswapDSPContext bbdsp;
54 void *bitstream_buf;
55 unsigned int bitstream_buf_size;
56} RawVideoContext;
57
58static const AVOption options[]={
59{"top", "top field first", offsetof(RawVideoContext, tff), AV_OPT_TYPE_BOOL, {.i64 = -1}, -1, 1, AV_OPT_FLAG_DECODING_PARAM|AV_OPT_FLAG_VIDEO_PARAM},
60{NULL}
61};
62
63static const AVClass rawdec_class = {
64 .class_name = "rawdec",
65 .option = options,
66 .version = LIBAVUTIL_VERSION_INT,
67};
68
69static av_cold int raw_init_decoder(AVCodecContext *avctx)
70{
71 RawVideoContext *context = avctx->priv_data;
72 const AVPixFmtDescriptor *desc;
73
74 ff_bswapdsp_init(&context->bbdsp);
75
76 if ( avctx->codec_tag == MKTAG('r','a','w',' ')
77 || avctx->codec_tag == MKTAG('N','O','1','6'))
78 avctx->pix_fmt = avpriv_find_pix_fmt(avpriv_pix_fmt_bps_mov,
79 avctx->bits_per_coded_sample);
80 else if (avctx->codec_tag == MKTAG('W', 'R', 'A', 'W'))
81 avctx->pix_fmt = avpriv_find_pix_fmt(avpriv_pix_fmt_bps_avi,
82 avctx->bits_per_coded_sample);
83 else if (avctx->codec_tag && (avctx->codec_tag & 0xFFFFFF) != MKTAG('B','I','T', 0))
84 avctx->pix_fmt = avpriv_find_pix_fmt(ff_raw_pix_fmt_tags, avctx->codec_tag);
85 else if (avctx->pix_fmt == AV_PIX_FMT_NONE && avctx->bits_per_coded_sample)
86 avctx->pix_fmt = avpriv_find_pix_fmt(avpriv_pix_fmt_bps_avi,
87 avctx->bits_per_coded_sample);
88
89 desc = av_pix_fmt_desc_get(avctx->pix_fmt);
90 if (!desc) {
91 av_log(avctx, AV_LOG_ERROR, "Invalid pixel format.\n");
92 return AVERROR(EINVAL);
93 }
94
95 if (desc->flags & (AV_PIX_FMT_FLAG_PAL | AV_PIX_FMT_FLAG_PSEUDOPAL)) {
96 context->palette = av_buffer_alloc(AVPALETTE_SIZE);
97 if (!context->palette)
98 return AVERROR(ENOMEM);
99 if (desc->flags & AV_PIX_FMT_FLAG_PSEUDOPAL)
100 avpriv_set_systematic_pal2((uint32_t*)context->palette->data, avctx->pix_fmt);
101 else {
102 memset(context->palette->data, 0, AVPALETTE_SIZE);
103 if (avctx->bits_per_coded_sample == 1)
104 memset(context->palette->data, 0xff, 4);
105 }
106 }
107
108 if ((avctx->extradata_size >= 9 &&
109 !memcmp(avctx->extradata + avctx->extradata_size - 9, "BottomUp", 9)) ||
110 avctx->codec_tag == MKTAG('c','y','u','v') ||
111 avctx->codec_tag == MKTAG(3, 0, 0, 0) ||
112 avctx->codec_tag == MKTAG('W','R','A','W'))
113 context->flip = 1;
114
115 if (avctx->pix_fmt == AV_PIX_FMT_MONOWHITE ||
116 avctx->pix_fmt == AV_PIX_FMT_MONOBLACK)
117 context->is_mono = 1;
118 else if (avctx->pix_fmt == AV_PIX_FMT_PAL8)
119 context->is_pal8 = 1;
120
121 if (avctx->codec_tag == MKTAG('B','1','W','0') ||
122 avctx->codec_tag == MKTAG('B','0','W','1'))
123 context->is_nut_mono = 1;
124 else if (avctx->codec_tag == MKTAG('P','A','L',8))
125 context->is_nut_pal8 = 1;
126
127 if (avctx->codec_tag == AV_RL32("yuv2") &&
128 avctx->pix_fmt == AV_PIX_FMT_YUYV422)
129 context->is_yuv2 = 1;
130
131 return 0;
132}
133
134static void flip(AVCodecContext *avctx, AVFrame *frame)
135{
136 frame->data[0] += frame->linesize[0] * (avctx->height - 1);
137 frame->linesize[0] *= -1;
138}
139
140/*
141 * Scale sample to 16-bit resolution
142 */
143#define SCALE16(x, bits) (((x) << (16 - (bits))) | ((x) >> (2 * (bits) - 16)))
144
145/**
146 * Scale buffer to 16 bits per coded sample resolution
147 */
148#define MKSCALE16(name, r16, w16) \
149static void name(AVCodecContext *avctx, uint8_t * dst, const uint8_t *buf, int buf_size, int packed) \
150{ \
151 int i; \
152 if (!packed) { \
153 for (i = 0; i + 1 < buf_size; i += 2) \
154 w16(dst + i, SCALE16(r16(buf + i), avctx->bits_per_coded_sample)); \
155 } else { \
156 GetBitContext gb; \
157 init_get_bits(&gb, buf, buf_size * 8); \
158 for (i = 0; i < avctx->width * avctx->height; i++) { \
159 int sample = get_bits(&gb, avctx->bits_per_coded_sample); \
160 w16(dst + i*2, SCALE16(sample, avctx->bits_per_coded_sample)); \
161 } \
162 } \
163}
164
165MKSCALE16(scale16be, AV_RB16, AV_WB16)
166MKSCALE16(scale16le, AV_RL16, AV_WL16)
167
168static int raw_decode(AVCodecContext *avctx, void *data, int *got_frame,
169 AVPacket *avpkt)
170{
171 const AVPixFmtDescriptor *desc;
172 RawVideoContext *context = avctx->priv_data;
173 const uint8_t *buf = avpkt->data;
174 int buf_size = avpkt->size;
175 int linesize_align = 4;
176 int stride;
177 int res, len;
178 int need_copy;
179
180 AVFrame *frame = data;
181
182 if (avctx->width <= 0) {
183 av_log(avctx, AV_LOG_ERROR, "width is not set\n");
184 return AVERROR_INVALIDDATA;
185 }
186 if (avctx->height <= 0) {
187 av_log(avctx, AV_LOG_ERROR, "height is not set\n");
188 return AVERROR_INVALIDDATA;
189 }
190
191 if (context->is_nut_mono)
192 stride = avctx->width / 8 + (avctx->width & 7 ? 1 : 0);
193 else if (context->is_nut_pal8)
194 stride = avctx->width;
195 else
196 stride = avpkt->size / avctx->height;
197
198 av_log(avctx, AV_LOG_DEBUG, "PACKET SIZE: %d, STRIDE: %d\n", avpkt->size, stride);
199
200 if (stride == 0 || avpkt->size < stride * avctx->height) {
201 av_log(avctx, AV_LOG_ERROR, "Packet too small (%d)\n", avpkt->size);
202 return AVERROR_INVALIDDATA;
203 }
204
205 desc = av_pix_fmt_desc_get(avctx->pix_fmt);
206
207 if ((avctx->bits_per_coded_sample == 8 || avctx->bits_per_coded_sample == 4 ||
208 avctx->bits_per_coded_sample == 2 || avctx->bits_per_coded_sample == 1 ||
209 (avctx->bits_per_coded_sample == 0 && (context->is_nut_pal8 || context->is_mono)) ) &&
210 (context->is_mono || context->is_pal8) &&
211 (!avctx->codec_tag || avctx->codec_tag == MKTAG('r','a','w',' ') ||
212 context->is_nut_mono || context->is_nut_pal8)) {
213 context->is_1_2_4_8_bpp = 1;
214 if (context->is_mono) {
215 int row_bytes = avctx->width / 8 + (avctx->width & 7 ? 1 : 0);
216 context->frame_size = av_image_get_buffer_size(avctx->pix_fmt,
217 FFALIGN(row_bytes, 16) * 8,
218 avctx->height, 1);
219 } else
220 context->frame_size = av_image_get_buffer_size(avctx->pix_fmt,
221 FFALIGN(avctx->width, 16),
222 avctx->height, 1);
223 } else {
224 context->is_lt_16bpp = av_get_bits_per_pixel(desc) == 16 && avctx->bits_per_coded_sample && avctx->bits_per_coded_sample < 16;
225 context->frame_size = av_image_get_buffer_size(avctx->pix_fmt, avctx->width,
226 avctx->height, 1);
227 }
228 if (context->frame_size < 0)
229 return context->frame_size;
230
231 need_copy = !avpkt->buf || context->is_1_2_4_8_bpp || context->is_yuv2 || context->is_lt_16bpp;
232
233 frame->pict_type = AV_PICTURE_TYPE_I;
234 frame->key_frame = 1;
235
236 res = ff_decode_frame_props(avctx, frame);
237 if (res < 0)
238 return res;
239
240 av_frame_set_pkt_pos (frame, avctx->internal->pkt->pos);
241 av_frame_set_pkt_duration(frame, avctx->internal->pkt->duration);
242
243 if (context->tff >= 0) {
244 frame->interlaced_frame = 1;
245 frame->top_field_first = context->tff;
246 }
247
248 if ((res = av_image_check_size(avctx->width, avctx->height, 0, avctx)) < 0)
249 return res;
250
251 if (need_copy)
252 frame->buf[0] = av_buffer_alloc(FFMAX(context->frame_size, buf_size));
253 else
254 frame->buf[0] = av_buffer_ref(avpkt->buf);
255 if (!frame->buf[0])
256 return AVERROR(ENOMEM);
257
258 // 1, 2, 4 and 8 bpp in avi/mov, 1 and 8 bpp in nut
259 if (context->is_1_2_4_8_bpp) {
260 int i, j, row_pix = 0;
261 uint8_t *dst = frame->buf[0]->data;
262 buf_size = context->frame_size - (context->is_pal8 ? AVPALETTE_SIZE : 0);
263 if (avctx->bits_per_coded_sample == 8 || context->is_nut_pal8 || context->is_mono) {
264 int pix_per_byte = context->is_mono ? 8 : 1;
265 for (i = 0, j = 0; j < buf_size && i<avpkt->size; i++, j++) {
266 dst[j] = buf[i];
267 row_pix += pix_per_byte;
268 if (row_pix >= avctx->width) {
269 i += stride - (i % stride) - 1;
270 j += 16 - (j % 16) - 1;
271 row_pix = 0;
272 }
273 }
274 } else if (avctx->bits_per_coded_sample == 4) {
275 for (i = 0, j = 0; 2 * j + 1 < buf_size && i<avpkt->size; i++, j++) {
276 dst[2 * j + 0] = buf[i] >> 4;
277 dst[2 * j + 1] = buf[i] & 15;
278 row_pix += 2;
279 if (row_pix >= avctx->width) {
280 i += stride - (i % stride) - 1;
281 j += 8 - (j % 8) - 1;
282 row_pix = 0;
283 }
284 }
285 } else if (avctx->bits_per_coded_sample == 2) {
286 for (i = 0, j = 0; 4 * j + 3 < buf_size && i<avpkt->size; i++, j++) {
287 dst[4 * j + 0] = buf[i] >> 6;
288 dst[4 * j + 1] = buf[i] >> 4 & 3;
289 dst[4 * j + 2] = buf[i] >> 2 & 3;
290 dst[4 * j + 3] = buf[i] & 3;
291 row_pix += 4;
292 if (row_pix >= avctx->width) {
293 i += stride - (i % stride) - 1;
294 j += 4 - (j % 4) - 1;
295 row_pix = 0;
296 }
297 }
298 } else {
299 av_assert0(avctx->bits_per_coded_sample == 1);
300 for (i = 0, j = 0; 8 * j + 7 < buf_size && i<avpkt->size; i++, j++) {
301 dst[8 * j + 0] = buf[i] >> 7;
302 dst[8 * j + 1] = buf[i] >> 6 & 1;
303 dst[8 * j + 2] = buf[i] >> 5 & 1;
304 dst[8 * j + 3] = buf[i] >> 4 & 1;
305 dst[8 * j + 4] = buf[i] >> 3 & 1;
306 dst[8 * j + 5] = buf[i] >> 2 & 1;
307 dst[8 * j + 6] = buf[i] >> 1 & 1;
308 dst[8 * j + 7] = buf[i] & 1;
309 row_pix += 8;
310 if (row_pix >= avctx->width) {
311 i += stride - (i % stride) - 1;
312 j += 2 - (j % 2) - 1;
313 row_pix = 0;
314 }
315 }
316 }
317 linesize_align = 16;
318 buf = dst;
319 } else if (context->is_lt_16bpp) {
320 uint8_t *dst = frame->buf[0]->data;
321 int packed = (avctx->codec_tag & 0xFFFFFF) == MKTAG('B','I','T', 0);
322 int swap = avctx->codec_tag >> 24;
323
324 if (packed && swap) {
325 av_fast_padded_malloc(&context->bitstream_buf, &context->bitstream_buf_size, buf_size);
326 if (!context->bitstream_buf)
327 return AVERROR(ENOMEM);
328 if (swap == 16)
329 context->bbdsp.bswap16_buf(context->bitstream_buf, (const uint16_t*)buf, buf_size / 2);
330 else if (swap == 32)
331 context->bbdsp.bswap_buf(context->bitstream_buf, (const uint32_t*)buf, buf_size / 4);
332 else
333 return AVERROR_INVALIDDATA;
334 buf = context->bitstream_buf;
335 }
336
337 if (desc->flags & AV_PIX_FMT_FLAG_BE)
338 scale16be(avctx, dst, buf, buf_size, packed);
339 else
340 scale16le(avctx, dst, buf, buf_size, packed);
341
342 buf = dst;
343 } else if (need_copy) {
344 memcpy(frame->buf[0]->data, buf, buf_size);
345 buf = frame->buf[0]->data;
346 }
347
348 if (avctx->codec_tag == MKTAG('A', 'V', '1', 'x') ||
349 avctx->codec_tag == MKTAG('A', 'V', 'u', 'p'))
350 buf += buf_size - context->frame_size;
351
352 len = context->frame_size - (avctx->pix_fmt==AV_PIX_FMT_PAL8 ? AVPALETTE_SIZE : 0);
353 if (buf_size < len && ((avctx->codec_tag & 0xFFFFFF) != MKTAG('B','I','T', 0) || !need_copy)) {
354 av_log(avctx, AV_LOG_ERROR, "Invalid buffer size, packet size %d < expected frame_size %d\n", buf_size, len);
355 av_buffer_unref(&frame->buf[0]);
356 return AVERROR(EINVAL);
357 }
358
359 if ((res = av_image_fill_arrays(frame->data, frame->linesize,
360 buf, avctx->pix_fmt,
361 avctx->width, avctx->height, 1)) < 0) {
362 av_buffer_unref(&frame->buf[0]);
363 return res;
364 }
365
366 if (avctx->pix_fmt == AV_PIX_FMT_PAL8) {
367 int pal_size;
368 const uint8_t *pal = av_packet_get_side_data(avpkt, AV_PKT_DATA_PALETTE,
369 &pal_size);
370 int ret;
371
372 if (pal && pal_size != AVPALETTE_SIZE) {
373 av_log(avctx, AV_LOG_ERROR, "Palette size %d is wrong\n", pal_size);
374 pal = NULL;
375 }
376
377 if (!context->palette)
378 context->palette = av_buffer_alloc(AVPALETTE_SIZE);
379 if (!context->palette) {
380 av_buffer_unref(&frame->buf[0]);
381 return AVERROR(ENOMEM);
382 }
383 ret = av_buffer_make_writable(&context->palette);
384 if (ret < 0) {
385 av_buffer_unref(&frame->buf[0]);
386 return ret;
387 }
388
389 if (pal) {
390 memcpy(context->palette->data, pal, AVPALETTE_SIZE);
391 frame->palette_has_changed = 1;
392 } else if (context->is_nut_pal8) {
393 int vid_size = avctx->width * avctx->height;
394 int pal_size = avpkt->size - vid_size;
395
396 if (avpkt->size > vid_size && pal_size <= AVPALETTE_SIZE) {
397 pal = avpkt->data + vid_size;
398 memcpy(context->palette->data, pal, pal_size);
399 frame->palette_has_changed = 1;
400 }
401 }
402 }
403
404 if ((avctx->pix_fmt==AV_PIX_FMT_RGB24 ||
405 avctx->pix_fmt==AV_PIX_FMT_BGR24 ||
406 avctx->pix_fmt==AV_PIX_FMT_GRAY8 ||
407 avctx->pix_fmt==AV_PIX_FMT_RGB555LE ||
408 avctx->pix_fmt==AV_PIX_FMT_RGB555BE ||
409 avctx->pix_fmt==AV_PIX_FMT_RGB565LE ||
410 avctx->pix_fmt==AV_PIX_FMT_MONOWHITE ||
411 avctx->pix_fmt==AV_PIX_FMT_MONOBLACK ||
412 avctx->pix_fmt==AV_PIX_FMT_PAL8) &&
413 FFALIGN(frame->linesize[0], linesize_align) * avctx->height <= buf_size)
414 frame->linesize[0] = FFALIGN(frame->linesize[0], linesize_align);
415
416 if (avctx->pix_fmt == AV_PIX_FMT_NV12 && avctx->codec_tag == MKTAG('N', 'V', '1', '2') &&
417 FFALIGN(frame->linesize[0], linesize_align) * avctx->height +
418 FFALIGN(frame->linesize[1], linesize_align) * ((avctx->height + 1) / 2) <= buf_size) {
419 int la0 = FFALIGN(frame->linesize[0], linesize_align);
420 frame->data[1] += (la0 - frame->linesize[0]) * avctx->height;
421 frame->linesize[0] = la0;
422 frame->linesize[1] = FFALIGN(frame->linesize[1], linesize_align);
423 }
424
425 if ((avctx->pix_fmt == AV_PIX_FMT_PAL8 && buf_size < context->frame_size) ||
426 (desc->flags & AV_PIX_FMT_FLAG_PSEUDOPAL)) {
427 frame->buf[1] = av_buffer_ref(context->palette);
428 if (!frame->buf[1]) {
429 av_buffer_unref(&frame->buf[0]);
430 return AVERROR(ENOMEM);
431 }
432 frame->data[1] = frame->buf[1]->data;
433 }
434
435 if (avctx->pix_fmt == AV_PIX_FMT_BGR24 &&
436 ((frame->linesize[0] + 3) & ~3) * avctx->height <= buf_size)
437 frame->linesize[0] = (frame->linesize[0] + 3) & ~3;
438
439 if (context->flip)
440 flip(avctx, frame);
441
442 if (avctx->codec_tag == MKTAG('Y', 'V', '1', '2') ||
443 avctx->codec_tag == MKTAG('Y', 'V', '1', '6') ||
444 avctx->codec_tag == MKTAG('Y', 'V', '2', '4') ||
445 avctx->codec_tag == MKTAG('Y', 'V', 'U', '9'))
446 FFSWAP(uint8_t *, frame->data[1], frame->data[2]);
447
448 if (avctx->codec_tag == AV_RL32("I420") && (avctx->width+1)*(avctx->height+1) * 3/2 == buf_size) {
449 frame->data[1] = frame->data[1] + (avctx->width+1)*(avctx->height+1) -avctx->width*avctx->height;
450 frame->data[2] = frame->data[2] + ((avctx->width+1)*(avctx->height+1) -avctx->width*avctx->height)*5/4;
451 }
452
453 if (avctx->codec_tag == AV_RL32("yuv2") &&
454 avctx->pix_fmt == AV_PIX_FMT_YUYV422) {
455 int x, y;
456 uint8_t *line = frame->data[0];
457 for (y = 0; y < avctx->height; y++) {
458 for (x = 0; x < avctx->width; x++)
459 line[2 * x + 1] ^= 0x80;
460 line += frame->linesize[0];
461 }
462 }
463
464 if (avctx->codec_tag == AV_RL32("b64a") &&
465 avctx->pix_fmt == AV_PIX_FMT_RGBA64BE) {
466 uint8_t *dst = frame->data[0];
467 uint64_t v;
468 int x;
469 for (x = 0; x >> 3 < avctx->width * avctx->height; x += 8) {
470 v = AV_RB64(&dst[x]);
471 AV_WB64(&dst[x], v << 16 | v >> 48);
472 }
473 }
474
475 if (avctx->field_order > AV_FIELD_PROGRESSIVE) { /* we have interlaced material flagged in container */
476 frame->interlaced_frame = 1;
477 if (avctx->field_order == AV_FIELD_TT || avctx->field_order == AV_FIELD_TB)
478 frame->top_field_first = 1;
479 }
480
481 *got_frame = 1;
482 return buf_size;
483}
484
485static av_cold int raw_close_decoder(AVCodecContext *avctx)
486{
487 RawVideoContext *context = avctx->priv_data;
488
489 av_buffer_unref(&context->palette);
490 return 0;
491}
492
493AVCodec ff_rawvideo_decoder = {
494 .name = "rawvideo",
495 .long_name = NULL_IF_CONFIG_SMALL("raw video"),
496 .type = AVMEDIA_TYPE_VIDEO,
497 .id = AV_CODEC_ID_RAWVIDEO,
498 .priv_data_size = sizeof(RawVideoContext),
499 .init = raw_init_decoder,
500 .close = raw_close_decoder,
501 .decode = raw_decode,
502 .priv_class = &rawdec_class,
503 .capabilities = AV_CODEC_CAP_PARAM_CHANGE,
504};
505
generated by cgit at 2024-05-17 06:56:14 (GMT)