| /* |
| * GEM Raster image decoder |
| * Copyright (c) 2021 Peter Ross (pross@xvid.org) |
| * |
| * 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 |
| * GEM Raster image decoder |
| */ |
| |
| #include "libavutil/mem.h" |
| #include "avcodec.h" |
| #include "bytestream.h" |
| #include "codec_internal.h" |
| #include "decode.h" |
| |
| static const uint32_t gem_color_palette[16]={ |
| 0xFFFFFFFF, 0xFFFF0000, 0xFF00FF00, 0xFFFFFF00, |
| 0xFF0000FF, 0xFFFF00FF, 0xFF00FFFF, 0xFFAEAEAE, |
| 0xFF555555, 0xFFAE0000, 0xFF00AE00, 0xFFAEAE00, |
| 0xFF0000AE, 0xFFAE00AE, 0xFF00AEAE, 0xFF000000, |
| }; |
| |
| static const uint8_t gem_gray[256]={ |
| 0xFF, 0x7F, 0xBF, 0x3F, 0xDF, 0x5F, 0x9F, 0x1F, 0xEF, 0x6F, 0xAF, 0x2F, 0xCF, 0x4F, 0x8F, 0x0F, |
| 0xF7, 0x77, 0xB7, 0x37, 0xD7, 0x57, 0x97, 0x17, 0xE7, 0x67, 0xA7, 0x27, 0xC7, 0x47, 0x87, 0x07, |
| 0xFB, 0x7B, 0xBB, 0x3B, 0xDB, 0x5B, 0x9B, 0x1B, 0xEB, 0x6B, 0xAB, 0x2B, 0xCB, 0x4B, 0x8B, 0x0B, |
| 0xF3, 0x73, 0xB3, 0x33, 0xD3, 0x53, 0x93, 0x13, 0xE3, 0x63, 0xA3, 0x23, 0xC3, 0x43, 0x83, 0x03, |
| 0xFD, 0x7D, 0xBD, 0x3D, 0xDD, 0x5D, 0x9D, 0x1D, 0xED, 0x6D, 0xAD, 0x2D, 0xCD, 0x4D, 0x8D, 0x0D, |
| 0xF5, 0x75, 0xB5, 0x35, 0xD5, 0x55, 0x95, 0x15, 0xE5, 0x65, 0xA5, 0x25, 0xC5, 0x45, 0x85, 0x05, |
| 0xF9, 0x79, 0xB9, 0x39, 0xD9, 0x59, 0x99, 0x19, 0xE9, 0x69, 0xA9, 0x29, 0xC9, 0x49, 0x89, 0x09, |
| 0xF1, 0x71, 0xB1, 0x31, 0xD1, 0x51, 0x91, 0x11, 0xE1, 0x61, 0xA1, 0x21, 0xC1, 0x41, 0x81, 0x01, |
| 0xFE, 0x7E, 0xBE, 0x3E, 0xDE, 0x5E, 0x9E, 0x1E, 0xEE, 0x6E, 0xAE, 0x2E, 0xCE, 0x4E, 0x8E, 0x0E, |
| 0xF6, 0x76, 0xB6, 0x36, 0xD6, 0x56, 0x96, 0x16, 0xE6, 0x66, 0xA6, 0x26, 0xC6, 0x46, 0x86, 0x06, |
| 0xFA, 0x7A, 0xBA, 0x3A, 0xDA, 0x5A, 0x9A, 0x1A, 0xEA, 0x6A, 0xAA, 0x2A, 0xCA, 0x4A, 0x8A, 0x0A, |
| 0xF2, 0x72, 0xB2, 0x32, 0xD2, 0x52, 0x92, 0x12, 0xE2, 0x62, 0xA2, 0x22, 0xC2, 0x42, 0x82, 0x02, |
| 0xFC, 0x7C, 0xBC, 0x3C, 0xDC, 0x5C, 0x9C, 0x1C, 0xEC, 0x6C, 0xAC, 0x2C, 0xCC, 0x4C, 0x8C, 0x0C, |
| 0xF4, 0x74, 0xB4, 0x34, 0xD4, 0x54, 0x94, 0x14, 0xE4, 0x64, 0xA4, 0x24, 0xC4, 0x44, 0x84, 0x04, |
| 0xF8, 0x78, 0xB8, 0x38, 0xD8, 0x58, 0x98, 0x18, 0xE8, 0x68, 0xA8, 0x28, 0xC8, 0x48, 0x88, 0x08, |
| 0xF0, 0x70, 0xB0, 0x30, 0xD0, 0x50, 0x90, 0x10, 0xE0, 0x60, 0xA0, 0x20, 0xC0, 0x40, 0x80, 0x00, |
| }; |
| |
| typedef struct { |
| int y, pl, x, vdup; |
| } State; |
| |
| static void put_lines_bits(AVCodecContext *avctx, int planes, int row_width, int pixel_size, State * state, uint8_t * row, AVFrame *p) |
| { |
| int pl_byte = state->pl / 8; |
| int pl_bit = state->pl & 7; |
| for (int y = 0; y < state->vdup && (state->y + y) < avctx->height; y++) |
| for (int x = 0; x < row_width; x++) |
| for (int i = 7; i >= 0 && x * 8 + 7 - i < avctx->width; i--) |
| p->data[0][ (state->y + y) * p->linesize[0] + (x * 8 + 7 - i) * pixel_size + pl_byte] |= !!(row[x] & (1 << i)) << pl_bit; |
| |
| state->pl++; |
| if (state->pl >= planes) { |
| state->pl = 0; |
| state->y += state->vdup; |
| state->vdup = 1; |
| } |
| } |
| |
| static void put_lines_bytes(AVCodecContext *avctx, int planes, int row_width, int pixel_size, State * state, uint8_t * row, AVFrame *p) |
| { |
| for (int y = 0; y < state->vdup && (state->y + y) < avctx->height; y++) |
| memcpy(p->data[0] + (state->y + y) * p->linesize[0], row, avctx->width * pixel_size); |
| |
| state->y += state->vdup; |
| state->vdup = 1; |
| } |
| |
| static int gem_decode_frame(AVCodecContext *avctx, AVFrame *p, |
| int *got_frame, AVPacket *avpkt) |
| { |
| const uint8_t *buf = avpkt->data; |
| int buf_size = avpkt->size; |
| const uint8_t *buf_end = buf + buf_size; |
| int header_size, planes, pattern_size, tag = 0, count_scalar = 1, ret; |
| unsigned int x, count, v; |
| GetByteContext gb; |
| uint32_t *palette; |
| const uint8_t * b; |
| uint8_t * row; |
| int row_width, pixel_size; |
| State state = {.y = 0, .pl = 0, .x = 0, .vdup = 1}; |
| void (*put_lines)(AVCodecContext *avctx, int planes, int row_width, int pixel_size, State * state, uint8_t * row, AVFrame *p); |
| int width, height; |
| |
| if (buf_size <= 16) |
| return AVERROR_INVALIDDATA; |
| |
| bytestream2_init(&gb, buf + 2, buf_size - 2); |
| header_size = bytestream2_get_be16(&gb); |
| if (header_size < 8 || buf_size <= header_size * 2) |
| return AVERROR_INVALIDDATA; |
| |
| planes = bytestream2_get_be16(&gb); |
| pattern_size = bytestream2_get_be16(&gb); |
| avctx->sample_aspect_ratio.num = bytestream2_get_be16(&gb); |
| avctx->sample_aspect_ratio.den = bytestream2_get_be16(&gb); |
| width = bytestream2_get_be16(&gb); |
| height = bytestream2_get_be16(&gb); |
| ret = ff_set_dimensions(avctx, width, height); |
| if (ret < 0) |
| return ret; |
| |
| row_width = (avctx->width + 7) / 8; |
| put_lines = put_lines_bits; |
| |
| if (header_size == 9) { |
| count_scalar = bytestream2_get_be16(&gb); |
| if (count_scalar != 3) { |
| avpriv_request_sample(avctx, "count_scalar=%d", count_scalar); |
| return AVERROR_PATCHWELCOME; |
| } |
| planes = 24; |
| avctx->pix_fmt = AV_PIX_FMT_BGR24; |
| pixel_size = 3; |
| } else if (planes == 15) { |
| #if HAVE_BIGENDIAN |
| avctx->pix_fmt = AV_PIX_FMT_BGR555BE; |
| #else |
| avctx->pix_fmt = AV_PIX_FMT_BGR555LE; |
| #endif |
| pixel_size = 2; |
| } else if (planes == 16) { |
| avctx->pix_fmt = AV_PIX_FMT_RGB565BE; |
| pixel_size = 2; |
| } else if (planes == 24) { |
| avctx->pix_fmt = AV_PIX_FMT_RGB24; |
| pixel_size = 3; |
| } else if (planes == 32) { |
| avctx->pix_fmt = AV_PIX_FMT_0RGB; |
| pixel_size = 4; |
| } else { |
| avctx->pix_fmt = AV_PIX_FMT_PAL8; |
| pixel_size = 1; |
| } |
| |
| if (header_size >= 11) |
| tag = bytestream2_peek_be32(&gb); |
| |
| if (tag == AV_RB32("STTT")) { |
| if (planes != 4) { |
| avpriv_request_sample(avctx, "STTT planes=%d", planes); |
| return AVERROR_PATCHWELCOME; |
| } |
| } else if (tag == AV_RB32("TIMG")) { |
| if (planes != 15) { |
| avpriv_request_sample(avctx, "TIMG planes=%d", planes); |
| return AVERROR_PATCHWELCOME; |
| } |
| } else if (tag == AV_RB32("XIMG")) { |
| if (planes != 1 && planes != 2 && planes != 4 && planes != 8 && planes != 16 && planes != 24 && planes != 32) { |
| avpriv_request_sample(avctx, "XIMG planes=%d", planes); |
| return AVERROR_PATCHWELCOME; |
| } |
| } else if (planes != 1 && planes != 2 && planes != 3 && planes != 4 && planes != 8 && planes != 16 && planes != 24) { |
| avpriv_request_sample(avctx, "planes=%d", planes); |
| return AVERROR_PATCHWELCOME; |
| } |
| |
| if ((ret = ff_get_buffer(avctx, p, 0)) < 0) |
| return ret; |
| |
| p->pict_type = AV_PICTURE_TYPE_I; |
| p->flags |= AV_FRAME_FLAG_KEY; |
| #if FF_API_PALETTE_HAS_CHANGED |
| FF_DISABLE_DEPRECATION_WARNINGS |
| p->palette_has_changed = 1; |
| FF_ENABLE_DEPRECATION_WARNINGS |
| #endif |
| palette = (uint32_t *)p->data[1]; |
| |
| if (tag == AV_RB32("STTT")) { |
| bytestream2_skip(&gb, 6); |
| if (planes == 4) { |
| for (int i = 0; i < (1 << planes); i++) { |
| int v = bytestream2_get_be16(&gb); |
| int r = ((v >> 8) & 0x7) << 5; |
| int g = ((v >> 4) & 0x7) << 5; |
| int b = ((v ) & 0x7) << 5; |
| palette[i] = 0xFF000000 | r << 16 | g << 8 | b; |
| } |
| } else { |
| av_assert0(0); |
| } |
| } else if (tag == AV_RB32("TIMG")) { |
| bytestream2_skip(&gb, 4); |
| if (planes != 15) { |
| av_assert0(0); |
| } |
| } else if (tag == AV_RB32("XIMG")) { |
| bytestream2_skip(&gb, 6); |
| if (planes == 1 || planes == 2 || planes == 4 || planes == 8) { |
| for (int i = 0; i < (1 << planes); i++) { |
| int r = (bytestream2_get_be16(&gb) * 51 + 100) / 200; |
| int g = (bytestream2_get_be16(&gb) * 51 + 100) / 200; |
| int b = (bytestream2_get_be16(&gb) * 51 + 100) / 200; |
| palette[i] = 0xFF000000 | r << 16 | g << 8 | b; |
| } |
| } else if (planes == 16) { |
| planes = 1; |
| row_width = ((avctx->width + 7)/8)*8 * pixel_size; |
| put_lines = put_lines_bytes; |
| } else if (planes == 24) { |
| planes = 1; |
| row_width = ((avctx->width + 15)/16)*16 * pixel_size; |
| put_lines = put_lines_bytes; |
| } else if (planes == 32) { |
| planes = 1; |
| row_width = avctx->width * pixel_size; |
| put_lines = put_lines_bytes; |
| } else { |
| av_assert0(0); |
| } |
| } else if (planes == 1) { |
| palette[0] = 0xFFFFFFFF; |
| palette[1] = 0xFF000000; |
| } else if (planes == 2 || planes == 3 || planes == 4) { |
| if (header_size == 9 + (1 << planes)) { |
| bytestream2_skip(&gb, 2); |
| for (int i = 0; i < (1 << planes); i++) { |
| int v = bytestream2_get_be16(&gb); |
| int r = ((v >> 8) & 0x7) << 5; |
| int g = ((v >> 4) & 0x7) << 5; |
| int b = ((v ) & 0x7) << 5; |
| palette[i] = 0xFF000000 | r << 16 | g << 8 | b; |
| } |
| } else |
| memcpy(palette, gem_color_palette, sizeof(gem_color_palette)); |
| } else if (planes == 8) { |
| for (int i = 0; i < 256; i++) |
| palette[i] = 0xFF000000 | (gem_gray[i]<<16) | (gem_gray[i]<<8) | gem_gray[i]; |
| } else if (planes == 16) { |
| planes = 1; |
| row_width = avctx->width * pixel_size; |
| put_lines = put_lines_bytes; |
| } else if (planes == 24) { |
| planes = 1; |
| row_width = avctx->width * pixel_size; |
| put_lines = put_lines_bytes; |
| } else |
| av_assert0(0); |
| |
| ret = av_reallocp_array(&avctx->priv_data, planes, row_width); |
| if (ret < 0) |
| return ret; |
| row = avctx->priv_data; |
| |
| memset(p->data[0], 0, avctx->height * p->linesize[0]); |
| b = buf + header_size * 2; |
| x = 0; |
| |
| #define SKIP \ |
| do { \ |
| x++; \ |
| if (x >= row_width) { \ |
| put_lines(avctx, planes, row_width, pixel_size, &state, row + state.pl * row_width, p); \ |
| if (state.y >= avctx->height) goto abort; \ |
| x = 0; \ |
| } \ |
| } while(0) |
| |
| #define PUT(v) \ |
| do { \ |
| row[state.pl * row_width + x++] = v; \ |
| if (x >= row_width) { \ |
| put_lines(avctx, planes, row_width, pixel_size, &state, row + state.pl * row_width, p); \ |
| if (state.y >= avctx->height) goto abort; \ |
| x = 0; \ |
| } \ |
| } while(0) |
| |
| while(b < buf_end) { |
| int opcode = *b++; |
| if (opcode == 0x80) { /* copy */ |
| if (b >= buf_end) |
| goto abort; |
| count = *b++; |
| if (!count) |
| count = 256; |
| count *= count_scalar; |
| for (int j = 0; j < count; j++) { |
| if (b >= buf_end) |
| goto abort; |
| PUT(*b++); |
| } |
| } else if (opcode) { /* run */ |
| count = opcode & 0x7f; |
| if (!count) |
| count = 256; |
| count *= count_scalar; |
| v = opcode & 0x80 ? 0xFF : 0x00; |
| for (int i = 0; i < count; i++) |
| PUT(v); |
| } else { |
| if (b >= buf_end) |
| goto abort; |
| count = *b++; |
| if (count) { /* pattern */ |
| if (b > buf_end - pattern_size) |
| goto abort; |
| |
| count *= count_scalar; |
| for (int j = 0; j < count; j++) |
| for (int k = 0; k < pattern_size; k++) |
| PUT(b[k]); |
| |
| b += pattern_size; |
| } else { |
| if (b >= buf_end) |
| goto abort; |
| count = *b++; |
| if (count == 0xFF) { /* vertical duplication */ |
| if (b >= buf_end) |
| goto abort; |
| state.vdup = *b++; |
| if (!state.vdup) |
| state.vdup = 256; |
| } else { /* horizontal duplication */ |
| for (int i = 0; i < count + 1; i++) |
| SKIP; |
| } |
| } |
| } |
| } |
| |
| abort: |
| |
| *got_frame = 1; |
| return buf_size; |
| } |
| |
| static av_cold int gem_close(AVCodecContext *avctx) |
| { |
| av_freep(&avctx->priv_data); |
| return 0; |
| } |
| |
| const FFCodec ff_gem_decoder = { |
| .p.name = "gem", |
| CODEC_LONG_NAME("GEM Raster image"), |
| .p.type = AVMEDIA_TYPE_VIDEO, |
| .p.id = AV_CODEC_ID_GEM, |
| .p.capabilities = AV_CODEC_CAP_DR1, |
| FF_CODEC_DECODE_CB(gem_decode_frame), |
| .close = gem_close, |
| }; |
