| /* |
| * Ut Video decoder |
| * Copyright (c) 2011 Konstantin Shishkov |
| * |
| * This file is part of FFmpeg. |
| * |
| * FFmpeg is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Lesser General Public |
| * License as published by the Free Software Foundation; either |
| * version 2.1 of the License, or (at your option) any later version. |
| * |
| * FFmpeg is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * Lesser General Public License for more details. |
| * |
| * You should have received a copy of the GNU Lesser General Public |
| * License along with FFmpeg; if not, write to the Free Software |
| * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| */ |
| |
| /** |
| * @file |
| * Ut Video decoder |
| */ |
| |
| #include <inttypes.h> |
| #include <stdlib.h> |
| |
| #include "libavutil/intreadwrite.h" |
| #include "avcodec.h" |
| #include "bswapdsp.h" |
| #include "bytestream.h" |
| #include "get_bits.h" |
| #include "thread.h" |
| #include "utvideo.h" |
| |
| static int build_huff(const uint8_t *src, VLC *vlc, int *fsym) |
| { |
| int i; |
| HuffEntry he[256]; |
| int last; |
| uint32_t codes[256]; |
| uint8_t bits[256]; |
| uint8_t syms[256]; |
| uint32_t code; |
| |
| *fsym = -1; |
| for (i = 0; i < 256; i++) { |
| he[i].sym = i; |
| he[i].len = *src++; |
| } |
| qsort(he, 256, sizeof(*he), ff_ut_huff_cmp_len); |
| |
| if (!he[0].len) { |
| *fsym = he[0].sym; |
| return 0; |
| } |
| |
| last = 255; |
| while (he[last].len == 255 && last) |
| last--; |
| |
| if (he[last].len > 32) |
| return -1; |
| |
| code = 1; |
| for (i = last; i >= 0; i--) { |
| codes[i] = code >> (32 - he[i].len); |
| bits[i] = he[i].len; |
| syms[i] = he[i].sym; |
| code += 0x80000000u >> (he[i].len - 1); |
| } |
| |
| return ff_init_vlc_sparse(vlc, FFMIN(he[last].len, 11), last + 1, |
| bits, sizeof(*bits), sizeof(*bits), |
| codes, sizeof(*codes), sizeof(*codes), |
| syms, sizeof(*syms), sizeof(*syms), 0); |
| } |
| |
| static int decode_plane(UtvideoContext *c, int plane_no, |
| uint8_t *dst, int step, int stride, |
| int width, int height, |
| const uint8_t *src, int use_pred) |
| { |
| int i, j, slice, pix; |
| int sstart, send; |
| VLC vlc; |
| GetBitContext gb; |
| int prev, fsym; |
| const int cmask = ~(!plane_no && c->avctx->pix_fmt == AV_PIX_FMT_YUV420P); |
| |
| if (build_huff(src, &vlc, &fsym)) { |
| av_log(c->avctx, AV_LOG_ERROR, "Cannot build Huffman codes\n"); |
| return AVERROR_INVALIDDATA; |
| } |
| if (fsym >= 0) { // build_huff reported a symbol to fill slices with |
| send = 0; |
| for (slice = 0; slice < c->slices; slice++) { |
| uint8_t *dest; |
| |
| sstart = send; |
| send = (height * (slice + 1) / c->slices) & cmask; |
| dest = dst + sstart * stride; |
| |
| prev = 0x80; |
| for (j = sstart; j < send; j++) { |
| for (i = 0; i < width * step; i += step) { |
| pix = fsym; |
| if (use_pred) { |
| prev += pix; |
| pix = prev; |
| } |
| dest[i] = pix; |
| } |
| dest += stride; |
| } |
| } |
| return 0; |
| } |
| |
| src += 256; |
| |
| send = 0; |
| for (slice = 0; slice < c->slices; slice++) { |
| uint8_t *dest; |
| int slice_data_start, slice_data_end, slice_size; |
| |
| sstart = send; |
| send = (height * (slice + 1) / c->slices) & cmask; |
| dest = dst + sstart * stride; |
| |
| // slice offset and size validation was done earlier |
| slice_data_start = slice ? AV_RL32(src + slice * 4 - 4) : 0; |
| slice_data_end = AV_RL32(src + slice * 4); |
| slice_size = slice_data_end - slice_data_start; |
| |
| if (!slice_size) { |
| av_log(c->avctx, AV_LOG_ERROR, "Plane has more than one symbol " |
| "yet a slice has a length of zero.\n"); |
| goto fail; |
| } |
| |
| memcpy(c->slice_bits, src + slice_data_start + c->slices * 4, |
| slice_size); |
| memset(c->slice_bits + slice_size, 0, AV_INPUT_BUFFER_PADDING_SIZE); |
| c->bdsp.bswap_buf((uint32_t *) c->slice_bits, |
| (uint32_t *) c->slice_bits, |
| (slice_data_end - slice_data_start + 3) >> 2); |
| init_get_bits(&gb, c->slice_bits, slice_size * 8); |
| |
| prev = 0x80; |
| for (j = sstart; j < send; j++) { |
| for (i = 0; i < width * step; i += step) { |
| if (get_bits_left(&gb) <= 0) { |
| av_log(c->avctx, AV_LOG_ERROR, |
| "Slice decoding ran out of bits\n"); |
| goto fail; |
| } |
| pix = get_vlc2(&gb, vlc.table, vlc.bits, 3); |
| if (pix < 0) { |
| av_log(c->avctx, AV_LOG_ERROR, "Decoding error\n"); |
| goto fail; |
| } |
| if (use_pred) { |
| prev += pix; |
| pix = prev; |
| } |
| dest[i] = pix; |
| } |
| dest += stride; |
| } |
| if (get_bits_left(&gb) > 32) |
| av_log(c->avctx, AV_LOG_WARNING, |
| "%d bits left after decoding slice\n", get_bits_left(&gb)); |
| } |
| |
| ff_free_vlc(&vlc); |
| |
| return 0; |
| fail: |
| ff_free_vlc(&vlc); |
| return AVERROR_INVALIDDATA; |
| } |
| |
| static void restore_rgb_planes(uint8_t *src, int step, int stride, int width, |
| int height) |
| { |
| int i, j; |
| uint8_t r, g, b; |
| |
| for (j = 0; j < height; j++) { |
| for (i = 0; i < width * step; i += step) { |
| r = src[i]; |
| g = src[i + 1]; |
| b = src[i + 2]; |
| src[i] = r + g - 0x80; |
| src[i + 2] = b + g - 0x80; |
| } |
| src += stride; |
| } |
| } |
| |
| static void restore_median(uint8_t *src, int step, int stride, |
| int width, int height, int slices, int rmode) |
| { |
| int i, j, slice; |
| int A, B, C; |
| uint8_t *bsrc; |
| int slice_start, slice_height; |
| const int cmask = ~rmode; |
| |
| for (slice = 0; slice < slices; slice++) { |
| slice_start = ((slice * height) / slices) & cmask; |
| slice_height = ((((slice + 1) * height) / slices) & cmask) - |
| slice_start; |
| |
| if (!slice_height) |
| continue; |
| bsrc = src + slice_start * stride; |
| |
| // first line - left neighbour prediction |
| bsrc[0] += 0x80; |
| A = bsrc[0]; |
| for (i = step; i < width * step; i += step) { |
| bsrc[i] += A; |
| A = bsrc[i]; |
| } |
| bsrc += stride; |
| if (slice_height <= 1) |
| continue; |
| // second line - first element has top prediction, the rest uses median |
| C = bsrc[-stride]; |
| bsrc[0] += C; |
| A = bsrc[0]; |
| for (i = step; i < width * step; i += step) { |
| B = bsrc[i - stride]; |
| bsrc[i] += mid_pred(A, B, (uint8_t)(A + B - C)); |
| C = B; |
| A = bsrc[i]; |
| } |
| bsrc += stride; |
| // the rest of lines use continuous median prediction |
| for (j = 2; j < slice_height; j++) { |
| for (i = 0; i < width * step; i += step) { |
| B = bsrc[i - stride]; |
| bsrc[i] += mid_pred(A, B, (uint8_t)(A + B - C)); |
| C = B; |
| A = bsrc[i]; |
| } |
| bsrc += stride; |
| } |
| } |
| } |
| |
| /* UtVideo interlaced mode treats every two lines as a single one, |
| * so restoring function should take care of possible padding between |
| * two parts of the same "line". |
| */ |
| static void restore_median_il(uint8_t *src, int step, int stride, |
| int width, int height, int slices, int rmode) |
| { |
| int i, j, slice; |
| int A, B, C; |
| uint8_t *bsrc; |
| int slice_start, slice_height; |
| const int cmask = ~(rmode ? 3 : 1); |
| const int stride2 = stride << 1; |
| |
| for (slice = 0; slice < slices; slice++) { |
| slice_start = ((slice * height) / slices) & cmask; |
| slice_height = ((((slice + 1) * height) / slices) & cmask) - |
| slice_start; |
| slice_height >>= 1; |
| if (!slice_height) |
| continue; |
| |
| bsrc = src + slice_start * stride; |
| |
| // first line - left neighbour prediction |
| bsrc[0] += 0x80; |
| A = bsrc[0]; |
| for (i = step; i < width * step; i += step) { |
| bsrc[i] += A; |
| A = bsrc[i]; |
| } |
| for (i = 0; i < width * step; i += step) { |
| bsrc[stride + i] += A; |
| A = bsrc[stride + i]; |
| } |
| bsrc += stride2; |
| if (slice_height <= 1) |
| continue; |
| // second line - first element has top prediction, the rest uses median |
| C = bsrc[-stride2]; |
| bsrc[0] += C; |
| A = bsrc[0]; |
| for (i = step; i < width * step; i += step) { |
| B = bsrc[i - stride2]; |
| bsrc[i] += mid_pred(A, B, (uint8_t)(A + B - C)); |
| C = B; |
| A = bsrc[i]; |
| } |
| for (i = 0; i < width * step; i += step) { |
| B = bsrc[i - stride]; |
| bsrc[stride + i] += mid_pred(A, B, (uint8_t)(A + B - C)); |
| C = B; |
| A = bsrc[stride + i]; |
| } |
| bsrc += stride2; |
| // the rest of lines use continuous median prediction |
| for (j = 2; j < slice_height; j++) { |
| for (i = 0; i < width * step; i += step) { |
| B = bsrc[i - stride2]; |
| bsrc[i] += mid_pred(A, B, (uint8_t)(A + B - C)); |
| C = B; |
| A = bsrc[i]; |
| } |
| for (i = 0; i < width * step; i += step) { |
| B = bsrc[i - stride]; |
| bsrc[i + stride] += mid_pred(A, B, (uint8_t)(A + B - C)); |
| C = B; |
| A = bsrc[i + stride]; |
| } |
| bsrc += stride2; |
| } |
| } |
| } |
| |
| static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame, |
| AVPacket *avpkt) |
| { |
| const uint8_t *buf = avpkt->data; |
| int buf_size = avpkt->size; |
| UtvideoContext *c = avctx->priv_data; |
| int i, j; |
| const uint8_t *plane_start[5]; |
| int plane_size, max_slice_size = 0, slice_start, slice_end, slice_size; |
| int ret; |
| GetByteContext gb; |
| ThreadFrame frame = { .f = data }; |
| |
| if ((ret = ff_thread_get_buffer(avctx, &frame, 0)) < 0) |
| return ret; |
| |
| /* parse plane structure to get frame flags and validate slice offsets */ |
| bytestream2_init(&gb, buf, buf_size); |
| for (i = 0; i < c->planes; i++) { |
| plane_start[i] = gb.buffer; |
| if (bytestream2_get_bytes_left(&gb) < 256 + 4 * c->slices) { |
| av_log(avctx, AV_LOG_ERROR, "Insufficient data for a plane\n"); |
| return AVERROR_INVALIDDATA; |
| } |
| bytestream2_skipu(&gb, 256); |
| slice_start = 0; |
| slice_end = 0; |
| for (j = 0; j < c->slices; j++) { |
| slice_end = bytestream2_get_le32u(&gb); |
| slice_size = slice_end - slice_start; |
| if (slice_end < 0 || slice_size < 0 || |
| bytestream2_get_bytes_left(&gb) < slice_end) { |
| av_log(avctx, AV_LOG_ERROR, "Incorrect slice size\n"); |
| return AVERROR_INVALIDDATA; |
| } |
| slice_start = slice_end; |
| max_slice_size = FFMAX(max_slice_size, slice_size); |
| } |
| plane_size = slice_end; |
| bytestream2_skipu(&gb, plane_size); |
| } |
| plane_start[c->planes] = gb.buffer; |
| if (bytestream2_get_bytes_left(&gb) < c->frame_info_size) { |
| av_log(avctx, AV_LOG_ERROR, "Not enough data for frame information\n"); |
| return AVERROR_INVALIDDATA; |
| } |
| c->frame_info = bytestream2_get_le32u(&gb); |
| av_log(avctx, AV_LOG_DEBUG, "frame information flags %"PRIX32"\n", |
| c->frame_info); |
| |
| c->frame_pred = (c->frame_info >> 8) & 3; |
| |
| if (c->frame_pred == PRED_GRADIENT) { |
| avpriv_request_sample(avctx, "Frame with gradient prediction"); |
| return AVERROR_PATCHWELCOME; |
| } |
| |
| av_fast_malloc(&c->slice_bits, &c->slice_bits_size, |
| max_slice_size + AV_INPUT_BUFFER_PADDING_SIZE); |
| |
| if (!c->slice_bits) { |
| av_log(avctx, AV_LOG_ERROR, "Cannot allocate temporary buffer\n"); |
| return AVERROR(ENOMEM); |
| } |
| |
| switch (c->avctx->pix_fmt) { |
| case AV_PIX_FMT_RGB24: |
| case AV_PIX_FMT_RGBA: |
| for (i = 0; i < c->planes; i++) { |
| ret = decode_plane(c, i, frame.f->data[0] + ff_ut_rgb_order[i], |
| c->planes, frame.f->linesize[0], avctx->width, |
| avctx->height, plane_start[i], |
| c->frame_pred == PRED_LEFT); |
| if (ret) |
| return ret; |
| if (c->frame_pred == PRED_MEDIAN) { |
| if (!c->interlaced) { |
| restore_median(frame.f->data[0] + ff_ut_rgb_order[i], |
| c->planes, frame.f->linesize[0], avctx->width, |
| avctx->height, c->slices, 0); |
| } else { |
| restore_median_il(frame.f->data[0] + ff_ut_rgb_order[i], |
| c->planes, frame.f->linesize[0], |
| avctx->width, avctx->height, c->slices, |
| 0); |
| } |
| } |
| } |
| restore_rgb_planes(frame.f->data[0], c->planes, frame.f->linesize[0], |
| avctx->width, avctx->height); |
| break; |
| case AV_PIX_FMT_YUV420P: |
| for (i = 0; i < 3; i++) { |
| ret = decode_plane(c, i, frame.f->data[i], 1, frame.f->linesize[i], |
| avctx->width >> !!i, avctx->height >> !!i, |
| plane_start[i], c->frame_pred == PRED_LEFT); |
| if (ret) |
| return ret; |
| if (c->frame_pred == PRED_MEDIAN) { |
| if (!c->interlaced) { |
| restore_median(frame.f->data[i], 1, frame.f->linesize[i], |
| avctx->width >> !!i, avctx->height >> !!i, |
| c->slices, !i); |
| } else { |
| restore_median_il(frame.f->data[i], 1, frame.f->linesize[i], |
| avctx->width >> !!i, |
| avctx->height >> !!i, |
| c->slices, !i); |
| } |
| } |
| } |
| break; |
| case AV_PIX_FMT_YUV422P: |
| for (i = 0; i < 3; i++) { |
| ret = decode_plane(c, i, frame.f->data[i], 1, frame.f->linesize[i], |
| avctx->width >> !!i, avctx->height, |
| plane_start[i], c->frame_pred == PRED_LEFT); |
| if (ret) |
| return ret; |
| if (c->frame_pred == PRED_MEDIAN) { |
| if (!c->interlaced) { |
| restore_median(frame.f->data[i], 1, frame.f->linesize[i], |
| avctx->width >> !!i, avctx->height, |
| c->slices, 0); |
| } else { |
| restore_median_il(frame.f->data[i], 1, frame.f->linesize[i], |
| avctx->width >> !!i, avctx->height, |
| c->slices, 0); |
| } |
| } |
| } |
| break; |
| } |
| |
| frame.f->key_frame = 1; |
| frame.f->pict_type = AV_PICTURE_TYPE_I; |
| frame.f->interlaced_frame = !!c->interlaced; |
| |
| *got_frame = 1; |
| |
| /* always report that the buffer was completely consumed */ |
| return buf_size; |
| } |
| |
| static av_cold int decode_init(AVCodecContext *avctx) |
| { |
| UtvideoContext * const c = avctx->priv_data; |
| |
| c->avctx = avctx; |
| |
| ff_bswapdsp_init(&c->bdsp); |
| |
| if (avctx->extradata_size < 16) { |
| av_log(avctx, AV_LOG_ERROR, |
| "Insufficient extradata size %d, should be at least 16\n", |
| avctx->extradata_size); |
| return AVERROR_INVALIDDATA; |
| } |
| |
| av_log(avctx, AV_LOG_DEBUG, "Encoder version %d.%d.%d.%d\n", |
| avctx->extradata[3], avctx->extradata[2], |
| avctx->extradata[1], avctx->extradata[0]); |
| av_log(avctx, AV_LOG_DEBUG, "Original format %"PRIX32"\n", |
| AV_RB32(avctx->extradata + 4)); |
| c->frame_info_size = AV_RL32(avctx->extradata + 8); |
| c->flags = AV_RL32(avctx->extradata + 12); |
| |
| if (c->frame_info_size != 4) |
| avpriv_request_sample(avctx, "Frame info not 4 bytes"); |
| av_log(avctx, AV_LOG_DEBUG, "Encoding parameters %08"PRIX32"\n", c->flags); |
| c->slices = (c->flags >> 24) + 1; |
| c->compression = c->flags & 1; |
| c->interlaced = c->flags & 0x800; |
| |
| c->slice_bits_size = 0; |
| |
| switch (avctx->codec_tag) { |
| case MKTAG('U', 'L', 'R', 'G'): |
| c->planes = 3; |
| avctx->pix_fmt = AV_PIX_FMT_RGB24; |
| break; |
| case MKTAG('U', 'L', 'R', 'A'): |
| c->planes = 4; |
| avctx->pix_fmt = AV_PIX_FMT_RGBA; |
| break; |
| case MKTAG('U', 'L', 'Y', '0'): |
| c->planes = 3; |
| avctx->pix_fmt = AV_PIX_FMT_YUV420P; |
| avctx->colorspace = AVCOL_SPC_BT470BG; |
| break; |
| case MKTAG('U', 'L', 'Y', '2'): |
| c->planes = 3; |
| avctx->pix_fmt = AV_PIX_FMT_YUV422P; |
| avctx->colorspace = AVCOL_SPC_BT470BG; |
| break; |
| case MKTAG('U', 'L', 'H', '0'): |
| c->planes = 3; |
| avctx->pix_fmt = AV_PIX_FMT_YUV420P; |
| avctx->colorspace = AVCOL_SPC_BT709; |
| break; |
| case MKTAG('U', 'L', 'H', '2'): |
| c->planes = 3; |
| avctx->pix_fmt = AV_PIX_FMT_YUV422P; |
| avctx->colorspace = AVCOL_SPC_BT709; |
| break; |
| default: |
| av_log(avctx, AV_LOG_ERROR, "Unknown Ut Video FOURCC provided (%08X)\n", |
| avctx->codec_tag); |
| return AVERROR_INVALIDDATA; |
| } |
| |
| return 0; |
| } |
| |
| static av_cold int decode_end(AVCodecContext *avctx) |
| { |
| UtvideoContext * const c = avctx->priv_data; |
| |
| av_freep(&c->slice_bits); |
| |
| return 0; |
| } |
| |
| AVCodec ff_utvideo_decoder = { |
| .name = "utvideo", |
| .long_name = NULL_IF_CONFIG_SMALL("Ut Video"), |
| .type = AVMEDIA_TYPE_VIDEO, |
| .id = AV_CODEC_ID_UTVIDEO, |
| .priv_data_size = sizeof(UtvideoContext), |
| .init = decode_init, |
| .close = decode_end, |
| .decode = decode_frame, |
| .capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_FRAME_THREADS, |
| }; |
