| /* |
| * Go2Webinar / Go2Meeting decoder |
| * Copyright (c) 2012 Konstantin Shishkov |
| * Copyright (c) 2013 Maxim Poliakovski |
| * |
| * 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 |
| * Go2Webinar / Go2Meeting decoder |
| */ |
| |
| #include <inttypes.h> |
| #include <zlib.h> |
| |
| #include "libavutil/intreadwrite.h" |
| |
| #include "avcodec.h" |
| #include "blockdsp.h" |
| #include "bytestream.h" |
| #include "elsdec.h" |
| #include "get_bits.h" |
| #include "idctdsp.h" |
| #include "internal.h" |
| #include "jpegtables.h" |
| #include "mjpeg.h" |
| |
| #define EPIC_PIX_STACK_SIZE 1024 |
| #define EPIC_PIX_STACK_MAX (EPIC_PIX_STACK_SIZE - 1) |
| |
| enum ChunkType { |
| DISPLAY_INFO = 0xC8, |
| TILE_DATA, |
| CURSOR_POS, |
| CURSOR_SHAPE, |
| CHUNK_CC, |
| CHUNK_CD |
| }; |
| |
| enum Compression { |
| COMPR_EPIC_J_B = 2, |
| COMPR_KEMPF_J_B, |
| }; |
| |
| static const uint8_t luma_quant[64] = { |
| 8, 6, 5, 8, 12, 20, 26, 31, |
| 6, 6, 7, 10, 13, 29, 30, 28, |
| 7, 7, 8, 12, 20, 29, 35, 28, |
| 7, 9, 11, 15, 26, 44, 40, 31, |
| 9, 11, 19, 28, 34, 55, 52, 39, |
| 12, 18, 28, 32, 41, 52, 57, 46, |
| 25, 32, 39, 44, 52, 61, 60, 51, |
| 36, 46, 48, 49, 56, 50, 52, 50 |
| }; |
| |
| static const uint8_t chroma_quant[64] = { |
| 9, 9, 12, 24, 50, 50, 50, 50, |
| 9, 11, 13, 33, 50, 50, 50, 50, |
| 12, 13, 28, 50, 50, 50, 50, 50, |
| 24, 33, 50, 50, 50, 50, 50, 50, |
| 50, 50, 50, 50, 50, 50, 50, 50, |
| 50, 50, 50, 50, 50, 50, 50, 50, |
| 50, 50, 50, 50, 50, 50, 50, 50, |
| 50, 50, 50, 50, 50, 50, 50, 50, |
| }; |
| |
| typedef struct ePICPixListElem { |
| struct ePICPixListElem *next; |
| uint32_t pixel; |
| uint8_t rung; |
| } ePICPixListElem; |
| |
| typedef struct ePICPixHashElem { |
| uint32_t pix_id; |
| struct ePICPixListElem *list; |
| } ePICPixHashElem; |
| |
| #define EPIC_HASH_SIZE 256 |
| typedef struct ePICPixHash { |
| ePICPixHashElem *bucket[EPIC_HASH_SIZE]; |
| int bucket_size[EPIC_HASH_SIZE]; |
| int bucket_fill[EPIC_HASH_SIZE]; |
| } ePICPixHash; |
| |
| typedef struct ePICContext { |
| ElsDecCtx els_ctx; |
| int next_run_pos; |
| ElsUnsignedRung unsigned_rung; |
| uint8_t W_flag_rung; |
| uint8_t N_flag_rung; |
| uint8_t W_ctx_rung[256]; |
| uint8_t N_ctx_rung[512]; |
| uint8_t nw_pred_rung[256]; |
| uint8_t ne_pred_rung[256]; |
| uint8_t prev_row_rung[14]; |
| uint8_t runlen_zeroes[14]; |
| uint8_t runlen_one; |
| int stack_pos; |
| uint32_t stack[EPIC_PIX_STACK_SIZE]; |
| ePICPixHash hash; |
| } ePICContext; |
| |
| typedef struct JPGContext { |
| BlockDSPContext bdsp; |
| IDCTDSPContext idsp; |
| ScanTable scantable; |
| |
| VLC dc_vlc[2], ac_vlc[2]; |
| int prev_dc[3]; |
| DECLARE_ALIGNED(16, int16_t, block)[6][64]; |
| |
| uint8_t *buf; |
| } JPGContext; |
| |
| typedef struct G2MContext { |
| ePICContext ec; |
| JPGContext jc; |
| |
| int version; |
| |
| int compression; |
| int width, height, bpp; |
| int orig_width, orig_height; |
| int tile_width, tile_height; |
| int tiles_x, tiles_y, tile_x, tile_y; |
| |
| int got_header; |
| |
| uint8_t *framebuf; |
| int framebuf_stride, old_width, old_height; |
| |
| uint8_t *synth_tile, *jpeg_tile, *epic_buf, *epic_buf_base; |
| int tile_stride, epic_buf_stride, old_tile_w, old_tile_h; |
| int swapuv; |
| |
| uint8_t *kempf_buf, *kempf_flags; |
| |
| uint8_t *cursor; |
| int cursor_stride; |
| int cursor_fmt; |
| int cursor_w, cursor_h, cursor_x, cursor_y; |
| int cursor_hot_x, cursor_hot_y; |
| } G2MContext; |
| |
| static av_cold int build_vlc(VLC *vlc, const uint8_t *bits_table, |
| const uint8_t *val_table, int nb_codes, |
| int is_ac) |
| { |
| uint8_t huff_size[256] = { 0 }; |
| uint16_t huff_code[256]; |
| uint16_t huff_sym[256]; |
| int i; |
| |
| ff_mjpeg_build_huffman_codes(huff_size, huff_code, bits_table, val_table); |
| |
| for (i = 0; i < 256; i++) |
| huff_sym[i] = i + 16 * is_ac; |
| |
| if (is_ac) |
| huff_sym[0] = 16 * 256; |
| |
| return ff_init_vlc_sparse(vlc, 9, nb_codes, huff_size, 1, 1, |
| huff_code, 2, 2, huff_sym, 2, 2, 0); |
| } |
| |
| static av_cold int jpg_init(AVCodecContext *avctx, JPGContext *c) |
| { |
| int ret; |
| |
| ret = build_vlc(&c->dc_vlc[0], avpriv_mjpeg_bits_dc_luminance, |
| avpriv_mjpeg_val_dc, 12, 0); |
| if (ret) |
| return ret; |
| ret = build_vlc(&c->dc_vlc[1], avpriv_mjpeg_bits_dc_chrominance, |
| avpriv_mjpeg_val_dc, 12, 0); |
| if (ret) |
| return ret; |
| ret = build_vlc(&c->ac_vlc[0], avpriv_mjpeg_bits_ac_luminance, |
| avpriv_mjpeg_val_ac_luminance, 251, 1); |
| if (ret) |
| return ret; |
| ret = build_vlc(&c->ac_vlc[1], avpriv_mjpeg_bits_ac_chrominance, |
| avpriv_mjpeg_val_ac_chrominance, 251, 1); |
| if (ret) |
| return ret; |
| |
| ff_blockdsp_init(&c->bdsp, avctx); |
| ff_idctdsp_init(&c->idsp, avctx); |
| ff_init_scantable(c->idsp.idct_permutation, &c->scantable, |
| ff_zigzag_direct); |
| |
| return 0; |
| } |
| |
| static av_cold void jpg_free_context(JPGContext *ctx) |
| { |
| int i; |
| |
| for (i = 0; i < 2; i++) { |
| ff_free_vlc(&ctx->dc_vlc[i]); |
| ff_free_vlc(&ctx->ac_vlc[i]); |
| } |
| |
| av_freep(&ctx->buf); |
| } |
| |
| static void jpg_unescape(const uint8_t *src, int src_size, |
| uint8_t *dst, int *dst_size) |
| { |
| const uint8_t *src_end = src + src_size; |
| uint8_t *dst_start = dst; |
| |
| while (src < src_end) { |
| uint8_t x = *src++; |
| |
| *dst++ = x; |
| |
| if (x == 0xFF && !*src) |
| src++; |
| } |
| *dst_size = dst - dst_start; |
| } |
| |
| static int jpg_decode_block(JPGContext *c, GetBitContext *gb, |
| int plane, int16_t *block) |
| { |
| int dc, val, pos; |
| const int is_chroma = !!plane; |
| const uint8_t *qmat = is_chroma ? chroma_quant : luma_quant; |
| |
| c->bdsp.clear_block(block); |
| dc = get_vlc2(gb, c->dc_vlc[is_chroma].table, 9, 3); |
| if (dc < 0) |
| return AVERROR_INVALIDDATA; |
| if (dc) |
| dc = get_xbits(gb, dc); |
| dc = dc * qmat[0] + c->prev_dc[plane]; |
| block[0] = dc; |
| c->prev_dc[plane] = dc; |
| |
| pos = 0; |
| while (pos < 63) { |
| val = get_vlc2(gb, c->ac_vlc[is_chroma].table, 9, 3); |
| if (val < 0) |
| return AVERROR_INVALIDDATA; |
| pos += val >> 4; |
| val &= 0xF; |
| if (pos > 63) |
| return val ? AVERROR_INVALIDDATA : 0; |
| if (val) { |
| int nbits = val; |
| |
| val = get_xbits(gb, nbits); |
| val *= qmat[ff_zigzag_direct[pos]]; |
| block[c->scantable.permutated[pos]] = val; |
| } |
| } |
| return 0; |
| } |
| |
| static inline void yuv2rgb(uint8_t *out, int ridx, int Y, int U, int V) |
| { |
| out[ridx] = av_clip_uint8(Y + (91881 * V + 32768 >> 16)); |
| out[1] = av_clip_uint8(Y + (-22554 * U - 46802 * V + 32768 >> 16)); |
| out[2 - ridx] = av_clip_uint8(Y + (116130 * U + 32768 >> 16)); |
| } |
| |
| static int jpg_decode_data(JPGContext *c, int width, int height, |
| const uint8_t *src, int src_size, |
| uint8_t *dst, int dst_stride, |
| const uint8_t *mask, int mask_stride, int num_mbs, |
| int swapuv) |
| { |
| GetBitContext gb; |
| int mb_w, mb_h, mb_x, mb_y, i, j; |
| int bx, by; |
| int unesc_size; |
| int ret; |
| const int ridx = swapuv ? 2 : 0; |
| |
| if ((ret = av_reallocp(&c->buf, |
| src_size + AV_INPUT_BUFFER_PADDING_SIZE)) < 0) |
| return ret; |
| jpg_unescape(src, src_size, c->buf, &unesc_size); |
| memset(c->buf + unesc_size, 0, AV_INPUT_BUFFER_PADDING_SIZE); |
| if((ret = init_get_bits8(&gb, c->buf, unesc_size)) < 0) |
| return ret; |
| |
| width = FFALIGN(width, 16); |
| mb_w = width >> 4; |
| mb_h = (height + 15) >> 4; |
| |
| if (!num_mbs) |
| num_mbs = mb_w * mb_h * 4; |
| |
| for (i = 0; i < 3; i++) |
| c->prev_dc[i] = 1024; |
| bx = |
| by = 0; |
| c->bdsp.clear_blocks(c->block[0]); |
| for (mb_y = 0; mb_y < mb_h; mb_y++) { |
| for (mb_x = 0; mb_x < mb_w; mb_x++) { |
| if (mask && !mask[mb_x * 2] && !mask[mb_x * 2 + 1] && |
| !mask[mb_x * 2 + mask_stride] && |
| !mask[mb_x * 2 + 1 + mask_stride]) { |
| bx += 16; |
| continue; |
| } |
| for (j = 0; j < 2; j++) { |
| for (i = 0; i < 2; i++) { |
| if (mask && !mask[mb_x * 2 + i + j * mask_stride]) |
| continue; |
| num_mbs--; |
| if ((ret = jpg_decode_block(c, &gb, 0, |
| c->block[i + j * 2])) != 0) |
| return ret; |
| c->idsp.idct(c->block[i + j * 2]); |
| } |
| } |
| for (i = 1; i < 3; i++) { |
| if ((ret = jpg_decode_block(c, &gb, i, c->block[i + 3])) != 0) |
| return ret; |
| c->idsp.idct(c->block[i + 3]); |
| } |
| |
| for (j = 0; j < 16; j++) { |
| uint8_t *out = dst + bx * 3 + (by + j) * dst_stride; |
| for (i = 0; i < 16; i++) { |
| int Y, U, V; |
| |
| Y = c->block[(j >> 3) * 2 + (i >> 3)][(i & 7) + (j & 7) * 8]; |
| U = c->block[4][(i >> 1) + (j >> 1) * 8] - 128; |
| V = c->block[5][(i >> 1) + (j >> 1) * 8] - 128; |
| yuv2rgb(out + i * 3, ridx, Y, U, V); |
| } |
| } |
| |
| if (!num_mbs) |
| return 0; |
| bx += 16; |
| } |
| bx = 0; |
| by += 16; |
| if (mask) |
| mask += mask_stride * 2; |
| } |
| |
| return 0; |
| } |
| |
| #define LOAD_NEIGHBOURS(x) \ |
| W = curr_row[(x) - 1]; \ |
| N = above_row[(x)]; \ |
| WW = curr_row[(x) - 2]; \ |
| NW = above_row[(x) - 1]; \ |
| NE = above_row[(x) + 1]; \ |
| NN = above2_row[(x)]; \ |
| NNW = above2_row[(x) - 1]; \ |
| NWW = above_row[(x) - 2]; \ |
| NNE = above2_row[(x) + 1] |
| |
| #define UPDATE_NEIGHBOURS(x) \ |
| NNW = NN; \ |
| NN = NNE; \ |
| NWW = NW; \ |
| NW = N; \ |
| N = NE; \ |
| NE = above_row[(x) + 1]; \ |
| NNE = above2_row[(x) + 1] |
| |
| #define R_shift 16 |
| #define G_shift 8 |
| #define B_shift 0 |
| |
| /* improved djb2 hash from http://www.cse.yorku.ca/~oz/hash.html */ |
| static int djb2_hash(uint32_t key) |
| { |
| uint32_t h = 5381; |
| |
| h = (h * 33) ^ ((key >> 24) & 0xFF); // xxx: probably not needed at all |
| h = (h * 33) ^ ((key >> 16) & 0xFF); |
| h = (h * 33) ^ ((key >> 8) & 0xFF); |
| h = (h * 33) ^ (key & 0xFF); |
| |
| return h & (EPIC_HASH_SIZE - 1); |
| } |
| |
| static void epic_hash_init(ePICPixHash *hash) |
| { |
| memset(hash, 0, sizeof(*hash)); |
| } |
| |
| static ePICPixHashElem *epic_hash_find(const ePICPixHash *hash, uint32_t key) |
| { |
| int i, idx = djb2_hash(key); |
| ePICPixHashElem *bucket = hash->bucket[idx]; |
| |
| for (i = 0; i < hash->bucket_fill[idx]; i++) |
| if (bucket[i].pix_id == key) |
| return &bucket[i]; |
| |
| return NULL; |
| } |
| |
| static ePICPixHashElem *epic_hash_add(ePICPixHash *hash, uint32_t key) |
| { |
| ePICPixHashElem *bucket, *ret; |
| int idx = djb2_hash(key); |
| |
| if (hash->bucket_size[idx] > INT_MAX / sizeof(**hash->bucket)) |
| return NULL; |
| |
| if (!(hash->bucket_fill[idx] < hash->bucket_size[idx])) { |
| int new_size = hash->bucket_size[idx] + 16; |
| bucket = av_realloc(hash->bucket[idx], new_size * sizeof(*bucket)); |
| if (!bucket) |
| return NULL; |
| hash->bucket[idx] = bucket; |
| hash->bucket_size[idx] = new_size; |
| } |
| |
| ret = &hash->bucket[idx][hash->bucket_fill[idx]++]; |
| memset(ret, 0, sizeof(*ret)); |
| ret->pix_id = key; |
| return ret; |
| } |
| |
| static int epic_add_pixel_to_cache(ePICPixHash *hash, uint32_t key, uint32_t pix) |
| { |
| ePICPixListElem *new_elem; |
| ePICPixHashElem *hash_elem = epic_hash_find(hash, key); |
| |
| if (!hash_elem) { |
| if (!(hash_elem = epic_hash_add(hash, key))) |
| return AVERROR(ENOMEM); |
| } |
| |
| new_elem = av_mallocz(sizeof(*new_elem)); |
| if (!new_elem) |
| return AVERROR(ENOMEM); |
| |
| new_elem->pixel = pix; |
| new_elem->next = hash_elem->list; |
| hash_elem->list = new_elem; |
| |
| return 0; |
| } |
| |
| static inline int epic_cache_entries_for_pixel(const ePICPixHash *hash, |
| uint32_t pix) |
| { |
| ePICPixHashElem *hash_elem = epic_hash_find(hash, pix); |
| |
| if (hash_elem != NULL && hash_elem->list != NULL) |
| return 1; |
| |
| return 0; |
| } |
| |
| static void epic_free_pixel_cache(ePICPixHash *hash) |
| { |
| int i, j; |
| |
| for (i = 0; i < EPIC_HASH_SIZE; i++) { |
| for (j = 0; j < hash->bucket_fill[i]; j++) { |
| ePICPixListElem *list_elem = hash->bucket[i][j].list; |
| while (list_elem) { |
| ePICPixListElem *tmp = list_elem->next; |
| av_free(list_elem); |
| list_elem = tmp; |
| } |
| } |
| av_freep(&hash->bucket[i]); |
| hash->bucket_size[i] = |
| hash->bucket_fill[i] = 0; |
| } |
| } |
| |
| static inline int is_pixel_on_stack(const ePICContext *dc, uint32_t pix) |
| { |
| int i; |
| |
| for (i = 0; i < dc->stack_pos; i++) |
| if (dc->stack[i] == pix) |
| break; |
| |
| return i != dc->stack_pos; |
| } |
| |
| #define TOSIGNED(val) (((val) >> 1) ^ -((val) & 1)) |
| |
| static inline int epic_decode_component_pred(ePICContext *dc, |
| int N, int W, int NW) |
| { |
| unsigned delta = ff_els_decode_unsigned(&dc->els_ctx, &dc->unsigned_rung); |
| return mid_pred(N, N + W - NW, W) - TOSIGNED(delta); |
| } |
| |
| static uint32_t epic_decode_pixel_pred(ePICContext *dc, int x, int y, |
| const uint32_t *curr_row, |
| const uint32_t *above_row) |
| { |
| uint32_t N, W, NW, pred; |
| unsigned delta; |
| int GN, GW, GNW, R, G, B; |
| |
| if (x && y) { |
| W = curr_row[x - 1]; |
| N = above_row[x]; |
| NW = above_row[x - 1]; |
| |
| GN = (N >> G_shift) & 0xFF; |
| GW = (W >> G_shift) & 0xFF; |
| GNW = (NW >> G_shift) & 0xFF; |
| |
| G = epic_decode_component_pred(dc, GN, GW, GNW); |
| |
| R = G + epic_decode_component_pred(dc, |
| ((N >> R_shift) & 0xFF) - GN, |
| ((W >> R_shift) & 0xFF) - GW, |
| ((NW >> R_shift) & 0xFF) - GNW); |
| |
| B = G + epic_decode_component_pred(dc, |
| ((N >> B_shift) & 0xFF) - GN, |
| ((W >> B_shift) & 0xFF) - GW, |
| ((NW >> B_shift) & 0xFF) - GNW); |
| } else { |
| if (x) |
| pred = curr_row[x - 1]; |
| else |
| pred = above_row[x]; |
| |
| delta = ff_els_decode_unsigned(&dc->els_ctx, &dc->unsigned_rung); |
| R = ((pred >> R_shift) & 0xFF) - TOSIGNED(delta); |
| |
| delta = ff_els_decode_unsigned(&dc->els_ctx, &dc->unsigned_rung); |
| G = ((pred >> G_shift) & 0xFF) - TOSIGNED(delta); |
| |
| delta = ff_els_decode_unsigned(&dc->els_ctx, &dc->unsigned_rung); |
| B = ((pred >> B_shift) & 0xFF) - TOSIGNED(delta); |
| } |
| |
| if (R<0 || G<0 || B<0) { |
| av_log(NULL, AV_LOG_ERROR, "RGB %d %d %d is out of range\n", R, G, B); |
| return 0; |
| } |
| |
| return (R << R_shift) | (G << G_shift) | (B << B_shift); |
| } |
| |
| static int epic_predict_pixel(ePICContext *dc, uint8_t *rung, |
| uint32_t *pPix, uint32_t pix) |
| { |
| if (!ff_els_decode_bit(&dc->els_ctx, rung)) { |
| *pPix = pix; |
| return 1; |
| } |
| dc->stack[dc->stack_pos++ & EPIC_PIX_STACK_MAX] = pix; |
| return 0; |
| } |
| |
| static int epic_handle_edges(ePICContext *dc, int x, int y, |
| const uint32_t *curr_row, |
| const uint32_t *above_row, uint32_t *pPix) |
| { |
| uint32_t pix; |
| |
| if (!x && !y) { /* special case: top-left pixel */ |
| /* the top-left pixel is coded independently with 3 unsigned numbers */ |
| *pPix = (ff_els_decode_unsigned(&dc->els_ctx, &dc->unsigned_rung) << R_shift) | |
| (ff_els_decode_unsigned(&dc->els_ctx, &dc->unsigned_rung) << G_shift) | |
| (ff_els_decode_unsigned(&dc->els_ctx, &dc->unsigned_rung) << B_shift); |
| return 1; |
| } |
| |
| if (x) { /* predict from W first */ |
| pix = curr_row[x - 1]; |
| if (epic_predict_pixel(dc, &dc->W_flag_rung, pPix, pix)) |
| return 1; |
| } |
| |
| if (y) { /* then try to predict from N */ |
| pix = above_row[x]; |
| if (!dc->stack_pos || dc->stack[0] != pix) { |
| if (epic_predict_pixel(dc, &dc->N_flag_rung, pPix, pix)) |
| return 1; |
| } |
| } |
| |
| return 0; |
| } |
| |
| static int epic_decode_run_length(ePICContext *dc, int x, int y, int tile_width, |
| const uint32_t *curr_row, |
| const uint32_t *above_row, |
| const uint32_t *above2_row, |
| uint32_t *pPix, int *pRun) |
| { |
| int idx, got_pixel = 0, WWneW, old_WWneW = 0; |
| uint32_t W, WW, N, NN, NW, NE, NWW, NNW, NNE; |
| |
| *pRun = 0; |
| |
| LOAD_NEIGHBOURS(x); |
| |
| if (dc->next_run_pos == x) { |
| /* can't reuse W for the new pixel in this case */ |
| WWneW = 1; |
| } else { |
| idx = (WW != W) << 7 | |
| (NW != W) << 6 | |
| (N != NE) << 5 | |
| (NW != N) << 4 | |
| (NWW != NW) << 3 | |
| (NNE != NE) << 2 | |
| (NN != N) << 1 | |
| (NNW != NW); |
| WWneW = ff_els_decode_bit(&dc->els_ctx, &dc->W_ctx_rung[idx]); |
| if (WWneW < 0) |
| return WWneW; |
| } |
| |
| if (WWneW) |
| dc->stack[dc->stack_pos++ & EPIC_PIX_STACK_MAX] = W; |
| else { |
| *pPix = W; |
| got_pixel = 1; |
| } |
| |
| do { |
| int NWneW = 1; |
| if (got_pixel) // pixel value already known (derived from either W or N) |
| NWneW = *pPix != N; |
| else { // pixel value is unknown and will be decoded later |
| NWneW = *pRun ? NWneW : NW != W; |
| |
| /* TODO: RFC this mess! */ |
| switch (((NW != N) << 2) | (NWneW << 1) | WWneW) { |
| case 0: |
| break; // do nothing here |
| case 3: |
| case 5: |
| case 6: |
| case 7: |
| if (!is_pixel_on_stack(dc, N)) { |
| idx = WWneW << 8 | |
| (*pRun ? old_WWneW : WW != W) << 7 | |
| NWneW << 6 | |
| (N != NE) << 5 | |
| (NW != N) << 4 | |
| (NWW != NW) << 3 | |
| (NNE != NE) << 2 | |
| (NN != N) << 1 | |
| (NNW != NW); |
| if (!ff_els_decode_bit(&dc->els_ctx, &dc->N_ctx_rung[idx])) { |
| NWneW = 0; |
| *pPix = N; |
| got_pixel = 1; |
| break; |
| } |
| } |
| /* fall through */ |
| default: |
| NWneW = 1; |
| old_WWneW = WWneW; |
| if (!is_pixel_on_stack(dc, N)) |
| dc->stack[dc->stack_pos++ & EPIC_PIX_STACK_MAX] = N; |
| } |
| } |
| |
| (*pRun)++; |
| if (x + *pRun >= tile_width - 1) |
| break; |
| |
| UPDATE_NEIGHBOURS(x + *pRun); |
| |
| if (!NWneW && NW == N && N == NE) { |
| int pos, run, rle; |
| int start_pos = x + *pRun; |
| |
| /* scan for a run of pix in the line above */ |
| uint32_t pix = above_row[start_pos + 1]; |
| for (pos = start_pos + 2; pos < tile_width; pos++) |
| if (!(above_row[pos] == pix)) |
| break; |
| run = pos - start_pos - 1; |
| idx = av_ceil_log2(run); |
| if (ff_els_decode_bit(&dc->els_ctx, &dc->prev_row_rung[idx])) |
| *pRun += run; |
| else { |
| int flag; |
| /* run-length is coded as plain binary number of idx - 1 bits */ |
| for (pos = idx - 1, rle = 0, flag = 0; pos >= 0; pos--) { |
| if ((1 << pos) + rle < run && |
| ff_els_decode_bit(&dc->els_ctx, |
| flag ? &dc->runlen_one |
| : &dc->runlen_zeroes[pos])) { |
| flag = 1; |
| rle |= 1 << pos; |
| } |
| } |
| *pRun += rle; |
| break; // return immediately |
| } |
| if (x + *pRun >= tile_width - 1) |
| break; |
| |
| LOAD_NEIGHBOURS(x + *pRun); |
| WWneW = 0; |
| NWneW = 0; |
| } |
| |
| idx = WWneW << 7 | |
| NWneW << 6 | |
| (N != NE) << 5 | |
| (NW != N) << 4 | |
| (NWW != NW) << 3 | |
| (NNE != NE) << 2 | |
| (NN != N) << 1 | |
| (NNW != NW); |
| WWneW = ff_els_decode_bit(&dc->els_ctx, &dc->W_ctx_rung[idx]); |
| } while (!WWneW); |
| |
| dc->next_run_pos = x + *pRun; |
| return got_pixel; |
| } |
| |
| static int epic_predict_pixel2(ePICContext *dc, uint8_t *rung, |
| uint32_t *pPix, uint32_t pix) |
| { |
| if (ff_els_decode_bit(&dc->els_ctx, rung)) { |
| *pPix = pix; |
| return 1; |
| } |
| dc->stack[dc->stack_pos++ & EPIC_PIX_STACK_MAX] = pix; |
| return 0; |
| } |
| |
| static int epic_predict_from_NW_NE(ePICContext *dc, int x, int y, int run, |
| int tile_width, const uint32_t *curr_row, |
| const uint32_t *above_row, uint32_t *pPix) |
| { |
| int pos; |
| |
| /* try to reuse the NW pixel first */ |
| if (x && y) { |
| uint32_t NW = above_row[x - 1]; |
| if (NW != curr_row[x - 1] && NW != above_row[x] && !is_pixel_on_stack(dc, NW)) { |
| if (epic_predict_pixel2(dc, &dc->nw_pred_rung[NW & 0xFF], pPix, NW)) |
| return 1; |
| } |
| } |
| |
| /* try to reuse the NE[x + run, y] pixel */ |
| pos = x + run - 1; |
| if (pos < tile_width - 1 && y) { |
| uint32_t NE = above_row[pos + 1]; |
| if (NE != above_row[pos] && !is_pixel_on_stack(dc, NE)) { |
| if (epic_predict_pixel2(dc, &dc->ne_pred_rung[NE & 0xFF], pPix, NE)) |
| return 1; |
| } |
| } |
| |
| return 0; |
| } |
| |
| static int epic_decode_from_cache(ePICContext *dc, uint32_t W, uint32_t *pPix) |
| { |
| ePICPixListElem *list, *prev = NULL; |
| ePICPixHashElem *hash_elem = epic_hash_find(&dc->hash, W); |
| |
| if (!hash_elem || !hash_elem->list) |
| return 0; |
| |
| list = hash_elem->list; |
| while (list) { |
| if (!is_pixel_on_stack(dc, list->pixel)) { |
| if (ff_els_decode_bit(&dc->els_ctx, &list->rung)) { |
| *pPix = list->pixel; |
| if (list != hash_elem->list) { |
| prev->next = list->next; |
| list->next = hash_elem->list; |
| hash_elem->list = list; |
| } |
| return 1; |
| } |
| dc->stack[dc->stack_pos++ & EPIC_PIX_STACK_MAX] = list->pixel; |
| } |
| prev = list; |
| list = list->next; |
| } |
| |
| return 0; |
| } |
| |
| static int epic_decode_tile(ePICContext *dc, uint8_t *out, int tile_height, |
| int tile_width, int stride) |
| { |
| int x, y; |
| uint32_t pix; |
| uint32_t *curr_row = NULL, *above_row = NULL, *above2_row; |
| |
| for (y = 0; y < tile_height; y++, out += stride) { |
| above2_row = above_row; |
| above_row = curr_row; |
| curr_row = (uint32_t *) out; |
| |
| for (x = 0, dc->next_run_pos = 0; x < tile_width;) { |
| if (dc->els_ctx.err) |
| return AVERROR_INVALIDDATA; // bail out in the case of ELS overflow |
| |
| pix = curr_row[x - 1]; // get W pixel |
| |
| if (y >= 1 && x >= 2 && |
| pix != curr_row[x - 2] && pix != above_row[x - 1] && |
| pix != above_row[x - 2] && pix != above_row[x] && |
| !epic_cache_entries_for_pixel(&dc->hash, pix)) { |
| curr_row[x] = epic_decode_pixel_pred(dc, x, y, curr_row, above_row); |
| x++; |
| } else { |
| int got_pixel, run; |
| dc->stack_pos = 0; // empty stack |
| |
| if (y < 2 || x < 2 || x == tile_width - 1) { |
| run = 1; |
| got_pixel = epic_handle_edges(dc, x, y, curr_row, above_row, &pix); |
| } else { |
| got_pixel = epic_decode_run_length(dc, x, y, tile_width, |
| curr_row, above_row, |
| above2_row, &pix, &run); |
| if (got_pixel < 0) |
| return got_pixel; |
| } |
| |
| if (!got_pixel && !epic_predict_from_NW_NE(dc, x, y, run, |
| tile_width, curr_row, |
| above_row, &pix)) { |
| uint32_t ref_pix = curr_row[x - 1]; |
| if (!x || !epic_decode_from_cache(dc, ref_pix, &pix)) { |
| pix = epic_decode_pixel_pred(dc, x, y, curr_row, above_row); |
| if (x) { |
| int ret = epic_add_pixel_to_cache(&dc->hash, |
| ref_pix, |
| pix); |
| if (ret) |
| return ret; |
| } |
| } |
| } |
| for (; run > 0; x++, run--) |
| curr_row[x] = pix; |
| } |
| } |
| } |
| |
| return 0; |
| } |
| |
| static int epic_jb_decode_tile(G2MContext *c, int tile_x, int tile_y, |
| const uint8_t *src, size_t src_size, |
| AVCodecContext *avctx) |
| { |
| uint8_t prefix, mask = 0x80; |
| int extrabytes, tile_width, tile_height, awidth, aheight; |
| size_t els_dsize; |
| uint8_t *dst; |
| |
| if (!src_size) |
| return 0; |
| |
| /* get data size of the ELS partition as unsigned variable-length integer */ |
| prefix = *src++; |
| src_size--; |
| for (extrabytes = 0; (prefix & mask) && (extrabytes < 7); extrabytes++) |
| mask >>= 1; |
| if (extrabytes > 3 || src_size < extrabytes) { |
| av_log(avctx, AV_LOG_ERROR, "ePIC: invalid data size VLI\n"); |
| return AVERROR_INVALIDDATA; |
| } |
| |
| els_dsize = prefix & ((0x80 >> extrabytes) - 1); // mask out the length prefix |
| while (extrabytes-- > 0) { |
| els_dsize = (els_dsize << 8) | *src++; |
| src_size--; |
| } |
| |
| if (src_size < els_dsize) { |
| av_log(avctx, AV_LOG_ERROR, "ePIC: data too short, needed %zu, got %zu\n", |
| els_dsize, src_size); |
| return AVERROR_INVALIDDATA; |
| } |
| |
| tile_width = FFMIN(c->width - tile_x * c->tile_width, c->tile_width); |
| tile_height = FFMIN(c->height - tile_y * c->tile_height, c->tile_height); |
| awidth = FFALIGN(tile_width, 16); |
| aheight = FFALIGN(tile_height, 16); |
| |
| if (els_dsize) { |
| int ret, i, j, k; |
| uint8_t tr_r, tr_g, tr_b, *buf; |
| uint32_t *in; |
| /* ELS decoder initializations */ |
| memset(&c->ec, 0, sizeof(c->ec)); |
| ff_els_decoder_init(&c->ec.els_ctx, src, els_dsize); |
| epic_hash_init(&c->ec.hash); |
| |
| /* decode transparent pixel value */ |
| tr_r = ff_els_decode_unsigned(&c->ec.els_ctx, &c->ec.unsigned_rung); |
| tr_g = ff_els_decode_unsigned(&c->ec.els_ctx, &c->ec.unsigned_rung); |
| tr_b = ff_els_decode_unsigned(&c->ec.els_ctx, &c->ec.unsigned_rung); |
| if (c->ec.els_ctx.err != 0) { |
| av_log(avctx, AV_LOG_ERROR, |
| "ePIC: couldn't decode transparency pixel!\n"); |
| return AVERROR_INVALIDDATA; |
| } |
| |
| ret = epic_decode_tile(&c->ec, c->epic_buf, tile_height, tile_width, |
| c->epic_buf_stride); |
| |
| epic_free_pixel_cache(&c->ec.hash); |
| ff_els_decoder_uninit(&c->ec.unsigned_rung); |
| |
| if (ret) { |
| av_log(avctx, AV_LOG_ERROR, |
| "ePIC: tile decoding failed, frame=%d, tile_x=%d, tile_y=%d\n", |
| avctx->frame_number, tile_x, tile_y); |
| return AVERROR_INVALIDDATA; |
| } |
| |
| buf = c->epic_buf; |
| dst = c->framebuf + tile_x * c->tile_width * 3 + |
| tile_y * c->tile_height * c->framebuf_stride; |
| |
| for (j = 0; j < tile_height; j++) { |
| uint8_t *out = dst; |
| in = (uint32_t *) buf; |
| for (i = 0; i < tile_width; i++) { |
| out[0] = (in[i] >> R_shift) & 0xFF; |
| out[1] = (in[i] >> G_shift) & 0xFF; |
| out[2] = (in[i] >> B_shift) & 0xFF; |
| out += 3; |
| } |
| buf += c->epic_buf_stride; |
| dst += c->framebuf_stride; |
| } |
| |
| if (src_size > els_dsize) { |
| uint8_t *jpg; |
| uint32_t tr; |
| int bstride = FFALIGN(tile_width, 16) >> 3; |
| int nblocks = 0; |
| int estride = c->epic_buf_stride >> 2; |
| |
| src += els_dsize; |
| src_size -= els_dsize; |
| |
| in = (uint32_t *) c->epic_buf; |
| tr = (tr_r << R_shift) | (tr_g << G_shift) | (tr_b << B_shift); |
| |
| memset(c->kempf_flags, 0, |
| (aheight >> 3) * bstride * sizeof(*c->kempf_flags)); |
| for (j = 0; j < tile_height; j += 8) { |
| for (i = 0; i < tile_width; i += 8) { |
| c->kempf_flags[(i >> 3) + (j >> 3) * bstride] = 0; |
| for (k = 0; k < 8 * 8; k++) { |
| if (in[i + (k & 7) + (k >> 3) * estride] == tr) { |
| c->kempf_flags[(i >> 3) + (j >> 3) * bstride] = 1; |
| nblocks++; |
| break; |
| } |
| } |
| } |
| in += 8 * estride; |
| } |
| |
| memset(c->jpeg_tile, 0, c->tile_stride * aheight); |
| jpg_decode_data(&c->jc, awidth, aheight, src, src_size, |
| c->jpeg_tile, c->tile_stride, |
| c->kempf_flags, bstride, nblocks, c->swapuv); |
| |
| in = (uint32_t *) c->epic_buf; |
| dst = c->framebuf + tile_x * c->tile_width * 3 + |
| tile_y * c->tile_height * c->framebuf_stride; |
| jpg = c->jpeg_tile; |
| for (j = 0; j < tile_height; j++) { |
| for (i = 0; i < tile_width; i++) |
| if (in[i] == tr) |
| memcpy(dst + i * 3, jpg + i * 3, 3); |
| in += c->epic_buf_stride >> 2; |
| dst += c->framebuf_stride; |
| jpg += c->tile_stride; |
| } |
| } |
| } else { |
| dst = c->framebuf + tile_x * c->tile_width * 3 + |
| tile_y * c->tile_height * c->framebuf_stride; |
| return jpg_decode_data(&c->jc, tile_width, tile_height, src, src_size, |
| dst, c->framebuf_stride, NULL, 0, 0, c->swapuv); |
| } |
| |
| return 0; |
| } |
| |
| static int kempf_restore_buf(const uint8_t *src, int len, |
| uint8_t *dst, int stride, |
| const uint8_t *jpeg_tile, int tile_stride, |
| int width, int height, |
| const uint8_t *pal, int npal, int tidx) |
| { |
| GetBitContext gb; |
| int i, j, nb, col; |
| int ret; |
| int align_width = FFALIGN(width, 16); |
| |
| if ((ret = init_get_bits8(&gb, src, len)) < 0) |
| return ret; |
| |
| if (npal <= 2) nb = 1; |
| else if (npal <= 4) nb = 2; |
| else if (npal <= 16) nb = 4; |
| else nb = 8; |
| |
| for (j = 0; j < height; j++, dst += stride, jpeg_tile += tile_stride) { |
| if (get_bits(&gb, 8)) |
| continue; |
| for (i = 0; i < width; i++) { |
| col = get_bits(&gb, nb); |
| if (col != tidx) |
| memcpy(dst + i * 3, pal + col * 3, 3); |
| else |
| memcpy(dst + i * 3, jpeg_tile + i * 3, 3); |
| } |
| skip_bits_long(&gb, nb * (align_width - width)); |
| } |
| |
| return 0; |
| } |
| |
| static int kempf_decode_tile(G2MContext *c, int tile_x, int tile_y, |
| const uint8_t *src, int src_size) |
| { |
| int width, height; |
| int hdr, zsize, npal, tidx = -1, ret; |
| int i, j; |
| const uint8_t *src_end = src + src_size; |
| uint8_t pal[768], transp[3]; |
| uLongf dlen = (c->tile_width + 1) * c->tile_height; |
| int sub_type; |
| int nblocks, cblocks, bstride; |
| int bits, bitbuf, coded; |
| uint8_t *dst = c->framebuf + tile_x * c->tile_width * 3 + |
| tile_y * c->tile_height * c->framebuf_stride; |
| |
| if (src_size < 2) |
| return AVERROR_INVALIDDATA; |
| |
| width = FFMIN(c->width - tile_x * c->tile_width, c->tile_width); |
| height = FFMIN(c->height - tile_y * c->tile_height, c->tile_height); |
| |
| hdr = *src++; |
| sub_type = hdr >> 5; |
| if (sub_type == 0) { |
| int j; |
| memcpy(transp, src, 3); |
| src += 3; |
| for (j = 0; j < height; j++, dst += c->framebuf_stride) |
| for (i = 0; i < width; i++) |
| memcpy(dst + i * 3, transp, 3); |
| return 0; |
| } else if (sub_type == 1) { |
| return jpg_decode_data(&c->jc, width, height, src, src_end - src, |
| dst, c->framebuf_stride, NULL, 0, 0, 0); |
| } |
| |
| if (sub_type != 2) { |
| memcpy(transp, src, 3); |
| src += 3; |
| } |
| npal = *src++ + 1; |
| if (src_end - src < npal * 3) |
| return AVERROR_INVALIDDATA; |
| memcpy(pal, src, npal * 3); |
| src += npal * 3; |
| if (sub_type != 2) { |
| for (i = 0; i < npal; i++) { |
| if (!memcmp(pal + i * 3, transp, 3)) { |
| tidx = i; |
| break; |
| } |
| } |
| } |
| |
| if (src_end - src < 2) |
| return 0; |
| zsize = (src[0] << 8) | src[1]; |
| src += 2; |
| |
| if (src_end - src < zsize + (sub_type != 2)) |
| return AVERROR_INVALIDDATA; |
| |
| ret = uncompress(c->kempf_buf, &dlen, src, zsize); |
| if (ret) |
| return AVERROR_INVALIDDATA; |
| src += zsize; |
| |
| if (sub_type == 2) { |
| kempf_restore_buf(c->kempf_buf, dlen, dst, c->framebuf_stride, |
| NULL, 0, width, height, pal, npal, tidx); |
| return 0; |
| } |
| |
| nblocks = *src++ + 1; |
| cblocks = 0; |
| bstride = FFALIGN(width, 16) >> 3; |
| // blocks are coded LSB and we need normal bitreader for JPEG data |
| bits = 0; |
| for (i = 0; i < (FFALIGN(height, 16) >> 4); i++) { |
| for (j = 0; j < (FFALIGN(width, 16) >> 4); j++) { |
| if (!bits) { |
| if (src >= src_end) |
| return AVERROR_INVALIDDATA; |
| bitbuf = *src++; |
| bits = 8; |
| } |
| coded = bitbuf & 1; |
| bits--; |
| bitbuf >>= 1; |
| cblocks += coded; |
| if (cblocks > nblocks) |
| return AVERROR_INVALIDDATA; |
| c->kempf_flags[j * 2 + i * 2 * bstride] = |
| c->kempf_flags[j * 2 + 1 + i * 2 * bstride] = |
| c->kempf_flags[j * 2 + (i * 2 + 1) * bstride] = |
| c->kempf_flags[j * 2 + 1 + (i * 2 + 1) * bstride] = coded; |
| } |
| } |
| |
| memset(c->jpeg_tile, 0, c->tile_stride * height); |
| jpg_decode_data(&c->jc, width, height, src, src_end - src, |
| c->jpeg_tile, c->tile_stride, |
| c->kempf_flags, bstride, nblocks * 4, 0); |
| |
| kempf_restore_buf(c->kempf_buf, dlen, dst, c->framebuf_stride, |
| c->jpeg_tile, c->tile_stride, |
| width, height, pal, npal, tidx); |
| |
| return 0; |
| } |
| |
| static int g2m_init_buffers(G2MContext *c) |
| { |
| int aligned_height; |
| |
| if (!c->framebuf || c->old_width < c->width || c->old_height < c->height) { |
| c->framebuf_stride = FFALIGN(c->width + 15, 16) * 3; |
| aligned_height = c->height + 15; |
| av_free(c->framebuf); |
| c->framebuf = av_mallocz_array(c->framebuf_stride, aligned_height); |
| if (!c->framebuf) |
| return AVERROR(ENOMEM); |
| } |
| if (!c->synth_tile || !c->jpeg_tile || |
| (c->compression == 2 && !c->epic_buf_base) || |
| c->old_tile_w < c->tile_width || |
| c->old_tile_h < c->tile_height) { |
| c->tile_stride = FFALIGN(c->tile_width, 16) * 3; |
| c->epic_buf_stride = FFALIGN(c->tile_width * 4, 16); |
| aligned_height = FFALIGN(c->tile_height, 16); |
| av_freep(&c->synth_tile); |
| av_freep(&c->jpeg_tile); |
| av_freep(&c->kempf_buf); |
| av_freep(&c->kempf_flags); |
| av_freep(&c->epic_buf_base); |
| c->epic_buf = NULL; |
| c->synth_tile = av_mallocz(c->tile_stride * aligned_height); |
| c->jpeg_tile = av_mallocz(c->tile_stride * aligned_height); |
| c->kempf_buf = av_mallocz((c->tile_width + 1) * aligned_height + |
| AV_INPUT_BUFFER_PADDING_SIZE); |
| c->kempf_flags = av_mallocz(c->tile_width * aligned_height); |
| if (!c->synth_tile || !c->jpeg_tile || |
| !c->kempf_buf || !c->kempf_flags) |
| return AVERROR(ENOMEM); |
| if (c->compression == 2) { |
| c->epic_buf_base = av_mallocz(c->epic_buf_stride * aligned_height + 4); |
| if (!c->epic_buf_base) |
| return AVERROR(ENOMEM); |
| c->epic_buf = c->epic_buf_base + 4; |
| } |
| } |
| |
| return 0; |
| } |
| |
| static int g2m_load_cursor(AVCodecContext *avctx, G2MContext *c, |
| GetByteContext *gb) |
| { |
| int i, j, k; |
| uint8_t *dst; |
| uint32_t bits; |
| uint32_t cur_size, cursor_w, cursor_h, cursor_stride; |
| uint32_t cursor_hot_x, cursor_hot_y; |
| int cursor_fmt, err; |
| |
| cur_size = bytestream2_get_be32(gb); |
| cursor_w = bytestream2_get_byte(gb); |
| cursor_h = bytestream2_get_byte(gb); |
| cursor_hot_x = bytestream2_get_byte(gb); |
| cursor_hot_y = bytestream2_get_byte(gb); |
| cursor_fmt = bytestream2_get_byte(gb); |
| |
| cursor_stride = FFALIGN(cursor_w, cursor_fmt==1 ? 32 : 1) * 4; |
| |
| if (cursor_w < 1 || cursor_w > 256 || |
| cursor_h < 1 || cursor_h > 256) { |
| av_log(avctx, AV_LOG_ERROR, "Invalid cursor dimensions %"PRIu32"x%"PRIu32"\n", |
| cursor_w, cursor_h); |
| return AVERROR_INVALIDDATA; |
| } |
| if (cursor_hot_x > cursor_w || cursor_hot_y > cursor_h) { |
| av_log(avctx, AV_LOG_WARNING, "Invalid hotspot position %"PRIu32",%"PRIu32"\n", |
| cursor_hot_x, cursor_hot_y); |
| cursor_hot_x = FFMIN(cursor_hot_x, cursor_w - 1); |
| cursor_hot_y = FFMIN(cursor_hot_y, cursor_h - 1); |
| } |
| if (cur_size - 9 > bytestream2_get_bytes_left(gb) || |
| c->cursor_w * c->cursor_h / 4 > cur_size) { |
| av_log(avctx, AV_LOG_ERROR, "Invalid cursor data size %"PRIu32"/%u\n", |
| cur_size, bytestream2_get_bytes_left(gb)); |
| return AVERROR_INVALIDDATA; |
| } |
| if (cursor_fmt != 1 && cursor_fmt != 32) { |
| avpriv_report_missing_feature(avctx, "Cursor format %d", |
| cursor_fmt); |
| return AVERROR_PATCHWELCOME; |
| } |
| |
| if ((err = av_reallocp(&c->cursor, cursor_stride * cursor_h)) < 0) { |
| av_log(avctx, AV_LOG_ERROR, "Cannot allocate cursor buffer\n"); |
| return err; |
| } |
| |
| c->cursor_w = cursor_w; |
| c->cursor_h = cursor_h; |
| c->cursor_hot_x = cursor_hot_x; |
| c->cursor_hot_y = cursor_hot_y; |
| c->cursor_fmt = cursor_fmt; |
| c->cursor_stride = cursor_stride; |
| |
| dst = c->cursor; |
| switch (c->cursor_fmt) { |
| case 1: // old monochrome |
| for (j = 0; j < c->cursor_h; j++) { |
| for (i = 0; i < c->cursor_w; i += 32) { |
| bits = bytestream2_get_be32(gb); |
| for (k = 0; k < 32; k++) { |
| dst[0] = !!(bits & 0x80000000); |
| dst += 4; |
| bits <<= 1; |
| } |
| } |
| } |
| |
| dst = c->cursor; |
| for (j = 0; j < c->cursor_h; j++) { |
| for (i = 0; i < c->cursor_w; i += 32) { |
| bits = bytestream2_get_be32(gb); |
| for (k = 0; k < 32; k++) { |
| int mask_bit = !!(bits & 0x80000000); |
| switch (dst[0] * 2 + mask_bit) { |
| case 0: |
| dst[0] = 0xFF; |
| dst[1] = 0x00; |
| dst[2] = 0x00; |
| dst[3] = 0x00; |
| break; |
| case 1: |
| dst[0] = 0xFF; |
| dst[1] = 0xFF; |
| dst[2] = 0xFF; |
| dst[3] = 0xFF; |
| break; |
| default: |
| dst[0] = 0x00; |
| dst[1] = 0x00; |
| dst[2] = 0x00; |
| dst[3] = 0x00; |
| } |
| dst += 4; |
| bits <<= 1; |
| } |
| } |
| } |
| break; |
| case 32: // full colour |
| /* skip monochrome version of the cursor and decode RGBA instead */ |
| bytestream2_skip(gb, c->cursor_h * (FFALIGN(c->cursor_w, 32) >> 3)); |
| for (j = 0; j < c->cursor_h; j++) { |
| for (i = 0; i < c->cursor_w; i++) { |
| int val = bytestream2_get_be32(gb); |
| *dst++ = val >> 0; |
| *dst++ = val >> 8; |
| *dst++ = val >> 16; |
| *dst++ = val >> 24; |
| } |
| } |
| break; |
| default: |
| return AVERROR_PATCHWELCOME; |
| } |
| return 0; |
| } |
| |
| #define APPLY_ALPHA(src, new, alpha) \ |
| src = (src * (256 - alpha) + new * alpha) >> 8 |
| |
| static void g2m_paint_cursor(G2MContext *c, uint8_t *dst, int stride) |
| { |
| int i, j; |
| int x, y, w, h; |
| const uint8_t *cursor; |
| |
| if (!c->cursor) |
| return; |
| |
| x = c->cursor_x - c->cursor_hot_x; |
| y = c->cursor_y - c->cursor_hot_y; |
| |
| cursor = c->cursor; |
| w = c->cursor_w; |
| h = c->cursor_h; |
| |
| if (x + w > c->width) |
| w = c->width - x; |
| if (y + h > c->height) |
| h = c->height - y; |
| if (x < 0) { |
| w += x; |
| cursor += -x * 4; |
| } else { |
| dst += x * 3; |
| } |
| if (y < 0) { |
| h += y; |
| cursor += -y * c->cursor_stride; |
| } else { |
| dst += y * stride; |
| } |
| if (w < 0 || h < 0) |
| return; |
| |
| for (j = 0; j < h; j++) { |
| for (i = 0; i < w; i++) { |
| uint8_t alpha = cursor[i * 4]; |
| APPLY_ALPHA(dst[i * 3 + 0], cursor[i * 4 + 1], alpha); |
| APPLY_ALPHA(dst[i * 3 + 1], cursor[i * 4 + 2], alpha); |
| APPLY_ALPHA(dst[i * 3 + 2], cursor[i * 4 + 3], alpha); |
| } |
| dst += stride; |
| cursor += c->cursor_stride; |
| } |
| } |
| |
| static int g2m_decode_frame(AVCodecContext *avctx, void *data, |
| int *got_picture_ptr, AVPacket *avpkt) |
| { |
| const uint8_t *buf = avpkt->data; |
| int buf_size = avpkt->size; |
| G2MContext *c = avctx->priv_data; |
| AVFrame *pic = data; |
| GetByteContext bc, tbc; |
| int magic; |
| int got_header = 0; |
| uint32_t chunk_size, r_mask, g_mask, b_mask; |
| int chunk_type, chunk_start; |
| int i; |
| int ret; |
| |
| if (buf_size < 12) { |
| av_log(avctx, AV_LOG_ERROR, |
| "Frame should have at least 12 bytes, got %d instead\n", |
| buf_size); |
| return AVERROR_INVALIDDATA; |
| } |
| |
| bytestream2_init(&bc, buf, buf_size); |
| |
| magic = bytestream2_get_be32(&bc); |
| if ((magic & ~0xF) != MKBETAG('G', '2', 'M', '0') || |
| (magic & 0xF) < 2 || (magic & 0xF) > 5) { |
| av_log(avctx, AV_LOG_ERROR, "Wrong magic %08X\n", magic); |
| return AVERROR_INVALIDDATA; |
| } |
| |
| c->swapuv = magic == MKBETAG('G', '2', 'M', '2'); |
| |
| while (bytestream2_get_bytes_left(&bc) > 5) { |
| chunk_size = bytestream2_get_le32(&bc) - 1; |
| chunk_type = bytestream2_get_byte(&bc); |
| chunk_start = bytestream2_tell(&bc); |
| if (chunk_size > bytestream2_get_bytes_left(&bc)) { |
| av_log(avctx, AV_LOG_ERROR, "Invalid chunk size %"PRIu32" type %02X\n", |
| chunk_size, chunk_type); |
| break; |
| } |
| switch (chunk_type) { |
| case DISPLAY_INFO: |
| got_header = |
| c->got_header = 0; |
| if (chunk_size < 21) { |
| av_log(avctx, AV_LOG_ERROR, "Invalid display info size %"PRIu32"\n", |
| chunk_size); |
| break; |
| } |
| c->width = bytestream2_get_be32(&bc); |
| c->height = bytestream2_get_be32(&bc); |
| if (c->width < 16 || c->height < 16) { |
| av_log(avctx, AV_LOG_ERROR, |
| "Invalid frame dimensions %dx%d\n", |
| c->width, c->height); |
| ret = AVERROR_INVALIDDATA; |
| goto header_fail; |
| } |
| if (c->width != avctx->width || c->height != avctx->height) { |
| ret = ff_set_dimensions(avctx, c->width, c->height); |
| if (ret < 0) |
| goto header_fail; |
| } |
| c->compression = bytestream2_get_be32(&bc); |
| if (c->compression != 2 && c->compression != 3) { |
| av_log(avctx, AV_LOG_ERROR, |
| "Unknown compression method %d\n", |
| c->compression); |
| ret = AVERROR_PATCHWELCOME; |
| goto header_fail; |
| } |
| c->tile_width = bytestream2_get_be32(&bc); |
| c->tile_height = bytestream2_get_be32(&bc); |
| if (c->tile_width <= 0 || c->tile_height <= 0 || |
| ((c->tile_width | c->tile_height) & 0xF) || |
| c->tile_width * (uint64_t)c->tile_height >= INT_MAX / 4 |
| ) { |
| av_log(avctx, AV_LOG_ERROR, |
| "Invalid tile dimensions %dx%d\n", |
| c->tile_width, c->tile_height); |
| ret = AVERROR_INVALIDDATA; |
| goto header_fail; |
| } |
| c->tiles_x = (c->width + c->tile_width - 1) / c->tile_width; |
| c->tiles_y = (c->height + c->tile_height - 1) / c->tile_height; |
| c->bpp = bytestream2_get_byte(&bc); |
| if (c->bpp == 32) { |
| if (bytestream2_get_bytes_left(&bc) < 16 || |
| (chunk_size - 21) < 16) { |
| av_log(avctx, AV_LOG_ERROR, |
| "Display info: missing bitmasks!\n"); |
| ret = AVERROR_INVALIDDATA; |
| goto header_fail; |
| } |
| r_mask = bytestream2_get_be32(&bc); |
| g_mask = bytestream2_get_be32(&bc); |
| b_mask = bytestream2_get_be32(&bc); |
| if (r_mask != 0xFF0000 || g_mask != 0xFF00 || b_mask != 0xFF) { |
| av_log(avctx, AV_LOG_ERROR, |
| "Invalid or unsupported bitmasks: R=%"PRIX32", G=%"PRIX32", B=%"PRIX32"\n", |
| r_mask, g_mask, b_mask); |
| ret = AVERROR_PATCHWELCOME; |
| goto header_fail; |
| } |
| } else { |
| avpriv_request_sample(avctx, "bpp=%d", c->bpp); |
| ret = AVERROR_PATCHWELCOME; |
| goto header_fail; |
| } |
| if (g2m_init_buffers(c)) { |
| ret = AVERROR(ENOMEM); |
| goto header_fail; |
| } |
| got_header = 1; |
| break; |
| case TILE_DATA: |
| if (!c->tiles_x || !c->tiles_y) { |
| av_log(avctx, AV_LOG_WARNING, |
| "No display info - skipping tile\n"); |
| break; |
| } |
| if (chunk_size < 2) { |
| av_log(avctx, AV_LOG_ERROR, "Invalid tile data size %"PRIu32"\n", |
| chunk_size); |
| break; |
| } |
| c->tile_x = bytestream2_get_byte(&bc); |
| c->tile_y = bytestream2_get_byte(&bc); |
| if (c->tile_x >= c->tiles_x || c->tile_y >= c->tiles_y) { |
| av_log(avctx, AV_LOG_ERROR, |
| "Invalid tile pos %d,%d (in %dx%d grid)\n", |
| c->tile_x, c->tile_y, c->tiles_x, c->tiles_y); |
| break; |
| } |
| ret = 0; |
| switch (c->compression) { |
| case COMPR_EPIC_J_B: |
| ret = epic_jb_decode_tile(c, c->tile_x, c->tile_y, |
| buf + bytestream2_tell(&bc), |
| chunk_size - 2, avctx); |
| break; |
| case COMPR_KEMPF_J_B: |
| ret = kempf_decode_tile(c, c->tile_x, c->tile_y, |
| buf + bytestream2_tell(&bc), |
| chunk_size - 2); |
| break; |
| } |
| if (ret && c->framebuf) |
| av_log(avctx, AV_LOG_ERROR, "Error decoding tile %d,%d\n", |
| c->tile_x, c->tile_y); |
| break; |
| case CURSOR_POS: |
| if (chunk_size < 5) { |
| av_log(avctx, AV_LOG_ERROR, "Invalid cursor pos size %"PRIu32"\n", |
| chunk_size); |
| break; |
| } |
| c->cursor_x = bytestream2_get_be16(&bc); |
| c->cursor_y = bytestream2_get_be16(&bc); |
| break; |
| case CURSOR_SHAPE: |
| if (chunk_size < 8) { |
| av_log(avctx, AV_LOG_ERROR, "Invalid cursor data size %"PRIu32"\n", |
| chunk_size); |
| break; |
| } |
| bytestream2_init(&tbc, buf + bytestream2_tell(&bc), |
| chunk_size - 4); |
| g2m_load_cursor(avctx, c, &tbc); |
| break; |
| case CHUNK_CC: |
| case CHUNK_CD: |
| break; |
| default: |
| av_log(avctx, AV_LOG_WARNING, "Skipping chunk type %02d\n", |
| chunk_type); |
| } |
| |
| /* navigate to next chunk */ |
| bytestream2_skip(&bc, chunk_start + chunk_size - bytestream2_tell(&bc)); |
| } |
| if (got_header) |
| c->got_header = 1; |
| |
| if (c->width && c->height && c->framebuf) { |
| if ((ret = ff_get_buffer(avctx, pic, 0)) < 0) |
| return ret; |
| |
| pic->key_frame = got_header; |
| pic->pict_type = got_header ? AV_PICTURE_TYPE_I : AV_PICTURE_TYPE_P; |
| |
| for (i = 0; i < avctx->height; i++) |
| memcpy(pic->data[0] + i * pic->linesize[0], |
| c->framebuf + i * c->framebuf_stride, |
| c->width * 3); |
| g2m_paint_cursor(c, pic->data[0], pic->linesize[0]); |
| |
| *got_picture_ptr = 1; |
| } |
| |
| return buf_size; |
| |
| header_fail: |
| c->width = |
| c->height = 0; |
| c->tiles_x = |
| c->tiles_y = 0; |
| c->tile_width = |
| c->tile_height = 0; |
| return ret; |
| } |
| |
| static av_cold int g2m_decode_init(AVCodecContext *avctx) |
| { |
| G2MContext *const c = avctx->priv_data; |
| int ret; |
| |
| if ((ret = jpg_init(avctx, &c->jc)) != 0) { |
| av_log(avctx, AV_LOG_ERROR, "Cannot initialise VLCs\n"); |
| jpg_free_context(&c->jc); |
| return AVERROR(ENOMEM); |
| } |
| |
| avctx->pix_fmt = AV_PIX_FMT_RGB24; |
| |
| // store original sizes and check against those if resize happens |
| c->orig_width = avctx->width; |
| c->orig_height = avctx->height; |
| |
| return 0; |
| } |
| |
| static av_cold int g2m_decode_end(AVCodecContext *avctx) |
| { |
| G2MContext *const c = avctx->priv_data; |
| |
| jpg_free_context(&c->jc); |
| |
| av_freep(&c->epic_buf_base); |
| c->epic_buf = NULL; |
| av_freep(&c->kempf_buf); |
| av_freep(&c->kempf_flags); |
| av_freep(&c->synth_tile); |
| av_freep(&c->jpeg_tile); |
| av_freep(&c->cursor); |
| av_freep(&c->framebuf); |
| |
| return 0; |
| } |
| |
| AVCodec ff_g2m_decoder = { |
| .name = "g2m", |
| .long_name = NULL_IF_CONFIG_SMALL("Go2Meeting"), |
| .type = AVMEDIA_TYPE_VIDEO, |
| .id = AV_CODEC_ID_G2M, |
| .priv_data_size = sizeof(G2MContext), |
| .init = g2m_decode_init, |
| .close = g2m_decode_end, |
| .decode = g2m_decode_frame, |
| .capabilities = AV_CODEC_CAP_DR1, |
| .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE, |
| }; |
