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_2_4_bpp; // 2 or 4 bpp raw in avi/mov 45 int is_yuv2; 46 int is_lt_16bpp; // 16bpp pixfmt and bits_per_coded_sample < 16 47 int tff; 48 49 BswapDSPContext bbdsp; 50 void *bitstream_buf; 51 unsigned int bitstream_buf_size; 52} RawVideoContext; 53 54static const AVOption options[]={ 55{"top", "top field first", offsetof(RawVideoContext, tff), AV_OPT_TYPE_INT, {.i64 = -1}, -1, 1, AV_OPT_FLAG_DECODING_PARAM|AV_OPT_FLAG_VIDEO_PARAM}, 56{NULL} 57}; 58 59static const AVClass rawdec_class = { 60 .class_name = "rawdec", 61 .option = options, 62 .version = LIBAVUTIL_VERSION_INT, 63}; 64 65#if LIBAVCODEC_VERSION_MAJOR < 55 66enum AVPixelFormat ff_find_pix_fmt(const PixelFormatTag *tags, unsigned int fourcc) 67{ 68 return avpriv_find_pix_fmt(tags, fourcc); 69} 70#endif 71 72static av_cold int raw_init_decoder(AVCodecContext *avctx) 73{ 74 RawVideoContext *context = avctx->priv_data; 75 const AVPixFmtDescriptor *desc; 76 77 ff_bswapdsp_init(&context->bbdsp); 78 79 if ( avctx->codec_tag == MKTAG('r','a','w',' ') 80 || avctx->codec_tag == MKTAG('N','O','1','6')) 81 avctx->pix_fmt = avpriv_find_pix_fmt(avpriv_pix_fmt_bps_mov, 82 avctx->bits_per_coded_sample); 83 else if (avctx->codec_tag == MKTAG('W', 'R', 'A', 'W')) 84 avctx->pix_fmt = avpriv_find_pix_fmt(avpriv_pix_fmt_bps_avi, 85 avctx->bits_per_coded_sample); 86 else if (avctx->codec_tag && (avctx->codec_tag & 0xFFFFFF) != MKTAG('B','I','T', 0)) 87 avctx->pix_fmt = avpriv_find_pix_fmt(ff_raw_pix_fmt_tags, avctx->codec_tag); 88 else if (avctx->pix_fmt == AV_PIX_FMT_NONE && avctx->bits_per_coded_sample) 89 avctx->pix_fmt = avpriv_find_pix_fmt(avpriv_pix_fmt_bps_avi, 90 avctx->bits_per_coded_sample); 91 92 desc = av_pix_fmt_desc_get(avctx->pix_fmt); 93 if (!desc) { 94 av_log(avctx, AV_LOG_ERROR, "Invalid pixel format.\n"); 95 return AVERROR(EINVAL); 96 } 97 98 if (desc->flags & (AV_PIX_FMT_FLAG_PAL | AV_PIX_FMT_FLAG_PSEUDOPAL)) { 99 context->palette = av_buffer_alloc(AVPALETTE_SIZE); 100 if (!context->palette) 101 return AVERROR(ENOMEM); 102 if (desc->flags & AV_PIX_FMT_FLAG_PSEUDOPAL) 103 avpriv_set_systematic_pal2((uint32_t*)context->palette->data, avctx->pix_fmt); 104 else 105 memset(context->palette->data, 0, AVPALETTE_SIZE); 106 } 107 108 if ((avctx->bits_per_coded_sample == 4 || avctx->bits_per_coded_sample == 2) && 109 avctx->pix_fmt == AV_PIX_FMT_PAL8 && 110 (!avctx->codec_tag || avctx->codec_tag == MKTAG('r','a','w',' '))) { 111 context->is_2_4_bpp = 1; 112 context->frame_size = avpicture_get_size(avctx->pix_fmt, 113 FFALIGN(avctx->width, 16), 114 avctx->height); 115 } else { 116 context->is_lt_16bpp = av_get_bits_per_pixel(desc) == 16 && avctx->bits_per_coded_sample && avctx->bits_per_coded_sample < 16; 117 context->frame_size = avpicture_get_size(avctx->pix_fmt, avctx->width, 118 avctx->height); 119 } 120 121 if ((avctx->extradata_size >= 9 && 122 !memcmp(avctx->extradata + avctx->extradata_size - 9, "BottomUp", 9)) || 123 avctx->codec_tag == MKTAG('c','y','u','v') || 124 avctx->codec_tag == MKTAG(3, 0, 0, 0) || 125 avctx->codec_tag == MKTAG('W','R','A','W')) 126 context->flip = 1; 127 128 if (avctx->codec_tag == AV_RL32("yuv2") && 129 avctx->pix_fmt == AV_PIX_FMT_YUYV422) 130 context->is_yuv2 = 1; 131 132 return 0; 133} 134 135static void flip(AVCodecContext *avctx, AVPicture *picture) 136{ 137 picture->data[0] += picture->linesize[0] * (avctx->height - 1); 138 picture->linesize[0] *= -1; 139} 140 141/* 142 * Scale sample to 16-bit resolution 143 */ 144#define SCALE16(x, bits) (((x) << (16 - (bits))) | ((x) >> (2 * (bits) - 16))) 145 146/** 147 * Scale buffer to 16 bits per coded sample resolution 148 */ 149#define MKSCALE16(name, r16, w16) \ 150static void name(AVCodecContext *avctx, uint8_t * dst, const uint8_t *buf, int buf_size, int packed) \ 151{ \ 152 int i; \ 153 if (!packed) { \ 154 for (i = 0; i + 1 < buf_size; i += 2) \ 155 w16(dst + i, SCALE16(r16(buf + i), avctx->bits_per_coded_sample)); \ 156 } else { \ 157 GetBitContext gb; \ 158 init_get_bits(&gb, buf, buf_size * 8); \ 159 for (i = 0; i < avctx->width * avctx->height; i++) { \ 160 int sample = get_bits(&gb, avctx->bits_per_coded_sample); \ 161 w16(dst + i*2, SCALE16(sample, avctx->bits_per_coded_sample)); \ 162 } \ 163 } \ 164} 165 166MKSCALE16(scale16be, AV_RB16, AV_WB16) 167MKSCALE16(scale16le, AV_RL16, AV_WL16) 168 169static int raw_decode(AVCodecContext *avctx, void *data, int *got_frame, 170 AVPacket *avpkt) 171{ 172 const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(avctx->pix_fmt); 173 RawVideoContext *context = avctx->priv_data; 174 const uint8_t *buf = avpkt->data; 175 int buf_size = avpkt->size; 176 int linesize_align = 4; 177 int res, len; 178 int need_copy = !avpkt->buf || context->is_2_4_bpp || context->is_yuv2 || context->is_lt_16bpp; 179 180 AVFrame *frame = data; 181 AVPicture *picture = data; 182 183 frame->pict_type = AV_PICTURE_TYPE_I; 184 frame->key_frame = 1; 185 186 res = ff_decode_frame_props(avctx, frame); 187 if (res < 0) 188 return res; 189 190 av_frame_set_pkt_pos (frame, avctx->internal->pkt->pos); 191 av_frame_set_pkt_duration(frame, avctx->internal->pkt->duration); 192 193 if (context->tff >= 0) { 194 frame->interlaced_frame = 1; 195 frame->top_field_first = context->tff; 196 } 197 198 if ((res = av_image_check_size(avctx->width, avctx->height, 0, avctx)) < 0) 199 return res; 200 201 if (need_copy) 202 frame->buf[0] = av_buffer_alloc(FFMAX(context->frame_size, buf_size)); 203 else 204 frame->buf[0] = av_buffer_ref(avpkt->buf); 205 if (!frame->buf[0]) 206 return AVERROR(ENOMEM); 207 208 //2bpp and 4bpp raw in avi and mov (yes this is ugly ...) 209 if (context->is_2_4_bpp) { 210 int i; 211 uint8_t *dst = frame->buf[0]->data; 212 buf_size = context->frame_size - AVPALETTE_SIZE; 213 if (avctx->bits_per_coded_sample == 4) { 214 for (i = 0; 2 * i + 1 < buf_size && i<avpkt->size; i++) { 215 dst[2 * i + 0] = buf[i] >> 4; 216 dst[2 * i + 1] = buf[i] & 15; 217 } 218 linesize_align = 8; 219 } else { 220 av_assert0(avctx->bits_per_coded_sample == 2); 221 for (i = 0; 4 * i + 3 < buf_size && i<avpkt->size; i++) { 222 dst[4 * i + 0] = buf[i] >> 6; 223 dst[4 * i + 1] = buf[i] >> 4 & 3; 224 dst[4 * i + 2] = buf[i] >> 2 & 3; 225 dst[4 * i + 3] = buf[i] & 3; 226 } 227 linesize_align = 16; 228 } 229 buf = dst; 230 } else if (context->is_lt_16bpp) { 231 uint8_t *dst = frame->buf[0]->data; 232 int packed = (avctx->codec_tag & 0xFFFFFF) == MKTAG('B','I','T', 0); 233 int swap = avctx->codec_tag >> 24; 234 235 if (packed && swap) { 236 av_fast_padded_malloc(&context->bitstream_buf, &context->bitstream_buf_size, buf_size); 237 if (!context->bitstream_buf) 238 return AVERROR(ENOMEM); 239 if (swap == 16) 240 context->bbdsp.bswap16_buf(context->bitstream_buf, (const uint16_t*)buf, buf_size / 2); 241 else if (swap == 32) 242 context->bbdsp.bswap_buf(context->bitstream_buf, (const uint32_t*)buf, buf_size / 4); 243 else 244 return AVERROR_INVALIDDATA; 245 buf = context->bitstream_buf; 246 } 247 248 if (desc->flags & AV_PIX_FMT_FLAG_BE) 249 scale16be(avctx, dst, buf, buf_size, packed); 250 else 251 scale16le(avctx, dst, buf, buf_size, packed); 252 253 buf = dst; 254 } else if (need_copy) { 255 memcpy(frame->buf[0]->data, buf, buf_size); 256 buf = frame->buf[0]->data; 257 } 258 259 if (avctx->codec_tag == MKTAG('A', 'V', '1', 'x') || 260 avctx->codec_tag == MKTAG('A', 'V', 'u', 'p')) 261 buf += buf_size - context->frame_size; 262 263 len = context->frame_size - (avctx->pix_fmt==AV_PIX_FMT_PAL8 ? AVPALETTE_SIZE : 0); 264 if (buf_size < len && (avctx->codec_tag & 0xFFFFFF) != MKTAG('B','I','T', 0)) { 265 av_log(avctx, AV_LOG_ERROR, "Invalid buffer size, packet size %d < expected frame_size %d\n", buf_size, len); 266 av_buffer_unref(&frame->buf[0]); 267 return AVERROR(EINVAL); 268 } 269 270 if ((res = avpicture_fill(picture, buf, avctx->pix_fmt, 271 avctx->width, avctx->height)) < 0) { 272 av_buffer_unref(&frame->buf[0]); 273 return res; 274 } 275 276 if (avctx->pix_fmt == AV_PIX_FMT_PAL8) { 277 const uint8_t *pal = av_packet_get_side_data(avpkt, AV_PKT_DATA_PALETTE, 278 NULL); 279 280 if (pal) { 281 av_buffer_unref(&context->palette); 282 context->palette = av_buffer_alloc(AVPALETTE_SIZE); 283 if (!context->palette) { 284 av_buffer_unref(&frame->buf[0]); 285 return AVERROR(ENOMEM); 286 } 287 memcpy(context->palette->data, pal, AVPALETTE_SIZE); 288 frame->palette_has_changed = 1; 289 } 290 } 291 292 if ((avctx->pix_fmt==AV_PIX_FMT_BGR24 || 293 avctx->pix_fmt==AV_PIX_FMT_GRAY8 || 294 avctx->pix_fmt==AV_PIX_FMT_RGB555LE || 295 avctx->pix_fmt==AV_PIX_FMT_RGB555BE || 296 avctx->pix_fmt==AV_PIX_FMT_RGB565LE || 297 avctx->pix_fmt==AV_PIX_FMT_MONOWHITE || 298 avctx->pix_fmt==AV_PIX_FMT_PAL8) && 299 FFALIGN(frame->linesize[0], linesize_align) * avctx->height <= buf_size) 300 frame->linesize[0] = FFALIGN(frame->linesize[0], linesize_align); 301 302 if (avctx->pix_fmt == AV_PIX_FMT_NV12 && avctx->codec_tag == MKTAG('N', 'V', '1', '2') && 303 FFALIGN(frame->linesize[0], linesize_align) * avctx->height + 304 FFALIGN(frame->linesize[1], linesize_align) * ((avctx->height + 1) / 2) <= buf_size) { 305 int la0 = FFALIGN(frame->linesize[0], linesize_align); 306 frame->data[1] += (la0 - frame->linesize[0]) * avctx->height; 307 frame->linesize[0] = la0; 308 frame->linesize[1] = FFALIGN(frame->linesize[1], linesize_align); 309 } 310 311 if ((avctx->pix_fmt == AV_PIX_FMT_PAL8 && buf_size < context->frame_size) || 312 (desc->flags & AV_PIX_FMT_FLAG_PSEUDOPAL)) { 313 frame->buf[1] = av_buffer_ref(context->palette); 314 if (!frame->buf[1]) { 315 av_buffer_unref(&frame->buf[0]); 316 return AVERROR(ENOMEM); 317 } 318 frame->data[1] = frame->buf[1]->data; 319 } 320 321 if (avctx->pix_fmt == AV_PIX_FMT_BGR24 && 322 ((frame->linesize[0] + 3) & ~3) * avctx->height <= buf_size) 323 frame->linesize[0] = (frame->linesize[0] + 3) & ~3; 324 325 if (context->flip) 326 flip(avctx, picture); 327 328 if (avctx->codec_tag == MKTAG('Y', 'V', '1', '2') || 329 avctx->codec_tag == MKTAG('Y', 'V', '1', '6') || 330 avctx->codec_tag == MKTAG('Y', 'V', '2', '4') || 331 avctx->codec_tag == MKTAG('Y', 'V', 'U', '9')) 332 FFSWAP(uint8_t *, picture->data[1], picture->data[2]); 333 334 if (avctx->codec_tag == AV_RL32("I420") && (avctx->width+1)*(avctx->height+1) * 3/2 == buf_size) { 335 picture->data[1] = picture->data[1] + (avctx->width+1)*(avctx->height+1) -avctx->width*avctx->height; 336 picture->data[2] = picture->data[2] + ((avctx->width+1)*(avctx->height+1) -avctx->width*avctx->height)*5/4; 337 } 338 339 if (avctx->codec_tag == AV_RL32("yuv2") && 340 avctx->pix_fmt == AV_PIX_FMT_YUYV422) { 341 int x, y; 342 uint8_t *line = picture->data[0]; 343 for (y = 0; y < avctx->height; y++) { 344 for (x = 0; x < avctx->width; x++) 345 line[2 * x + 1] ^= 0x80; 346 line += picture->linesize[0]; 347 } 348 } 349 350 if (avctx->field_order > AV_FIELD_PROGRESSIVE) { /* we have interlaced material flagged in container */ 351 frame->interlaced_frame = 1; 352 if (avctx->field_order == AV_FIELD_TT || avctx->field_order == AV_FIELD_TB) 353 frame->top_field_first = 1; 354 } 355 356 *got_frame = 1; 357 return buf_size; 358} 359 360static av_cold int raw_close_decoder(AVCodecContext *avctx) 361{ 362 RawVideoContext *context = avctx->priv_data; 363 364 av_buffer_unref(&context->palette); 365 return 0; 366} 367 368AVCodec ff_rawvideo_decoder = { 369 .name = "rawvideo", 370 .long_name = NULL_IF_CONFIG_SMALL("raw video"), 371 .type = AVMEDIA_TYPE_VIDEO, 372 .id = AV_CODEC_ID_RAWVIDEO, 373 .priv_data_size = sizeof(RawVideoContext), 374 .init = raw_init_decoder, 375 .close = raw_close_decoder, 376 .decode = raw_decode, 377 .priv_class = &rawdec_class, 378}; 379