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https://git.ffmpeg.org/ffmpeg.git
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893 lines
28 KiB
C
893 lines
28 KiB
C
/*
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* Go2Webinar decoder
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* Copyright (c) 2012 Konstantin Shishkov
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*
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* This file is part of Libav.
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*
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* Libav is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* Libav is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with Libav; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file
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* Go2Webinar decoder
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*/
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#include <zlib.h>
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#include "libavutil/intreadwrite.h"
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#include "avcodec.h"
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#include "bytestream.h"
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#include "dsputil.h"
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#include "get_bits.h"
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#include "internal.h"
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#include "mjpeg.h"
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enum ChunkType {
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DISPLAY_INFO = 0xC8,
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TILE_DATA,
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CURSOR_POS,
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CURSOR_SHAPE,
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CHUNK_CC,
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CHUNK_CD
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};
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enum Compression {
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COMPR_EPIC_J_B = 2,
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COMPR_KEMPF_J_B,
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};
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static const uint8_t luma_quant[64] = {
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8, 6, 5, 8, 12, 20, 26, 31,
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6, 6, 7, 10, 13, 29, 30, 28,
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7, 7, 8, 12, 20, 29, 35, 28,
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7, 9, 11, 15, 26, 44, 40, 31,
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9, 11, 19, 28, 34, 55, 52, 39,
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12, 18, 28, 32, 41, 52, 57, 46,
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25, 32, 39, 44, 52, 61, 60, 51,
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36, 46, 48, 49, 56, 50, 52, 50
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};
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static const uint8_t chroma_quant[64] = {
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9, 9, 12, 24, 50, 50, 50, 50,
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9, 11, 13, 33, 50, 50, 50, 50,
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12, 13, 28, 50, 50, 50, 50, 50,
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24, 33, 50, 50, 50, 50, 50, 50,
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50, 50, 50, 50, 50, 50, 50, 50,
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50, 50, 50, 50, 50, 50, 50, 50,
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50, 50, 50, 50, 50, 50, 50, 50,
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50, 50, 50, 50, 50, 50, 50, 50,
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};
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typedef struct JPGContext {
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DSPContext dsp;
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ScanTable scantable;
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VLC dc_vlc[2], ac_vlc[2];
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int prev_dc[3];
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DECLARE_ALIGNED(16, int16_t, block)[6][64];
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uint8_t *buf;
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} JPGContext;
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typedef struct G2MContext {
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JPGContext jc;
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int version;
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int compression;
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int width, height, bpp;
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int tile_width, tile_height;
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int tiles_x, tiles_y, tile_x, tile_y;
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int got_header;
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uint8_t *framebuf;
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int framebuf_stride, old_width, old_height;
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uint8_t *synth_tile, *jpeg_tile;
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int tile_stride, old_tile_w, old_tile_h;
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uint8_t *kempf_buf, *kempf_flags;
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uint8_t *cursor;
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int cursor_stride;
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int cursor_fmt;
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int cursor_w, cursor_h, cursor_x, cursor_y;
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int cursor_hot_x, cursor_hot_y;
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} G2MContext;
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static av_cold int build_vlc(VLC *vlc, const uint8_t *bits_table,
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const uint8_t *val_table, int nb_codes,
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int is_ac)
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{
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uint8_t huff_size[256] = { 0 };
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uint16_t huff_code[256];
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uint16_t huff_sym[256];
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int i;
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ff_mjpeg_build_huffman_codes(huff_size, huff_code, bits_table, val_table);
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for (i = 0; i < 256; i++)
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huff_sym[i] = i + 16 * is_ac;
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if (is_ac)
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huff_sym[0] = 16 * 256;
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return ff_init_vlc_sparse(vlc, 9, nb_codes, huff_size, 1, 1,
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huff_code, 2, 2, huff_sym, 2, 2, 0);
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}
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static av_cold int jpg_init(AVCodecContext *avctx, JPGContext *c)
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{
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int ret;
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ret = build_vlc(&c->dc_vlc[0], avpriv_mjpeg_bits_dc_luminance,
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avpriv_mjpeg_val_dc, 12, 0);
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if (ret)
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return ret;
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ret = build_vlc(&c->dc_vlc[1], avpriv_mjpeg_bits_dc_chrominance,
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avpriv_mjpeg_val_dc, 12, 0);
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if (ret)
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return ret;
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ret = build_vlc(&c->ac_vlc[0], avpriv_mjpeg_bits_ac_luminance,
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avpriv_mjpeg_val_ac_luminance, 251, 1);
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if (ret)
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return ret;
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ret = build_vlc(&c->ac_vlc[1], avpriv_mjpeg_bits_ac_chrominance,
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avpriv_mjpeg_val_ac_chrominance, 251, 1);
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if (ret)
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return ret;
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ff_dsputil_init(&c->dsp, avctx);
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ff_init_scantable(c->dsp.idct_permutation, &c->scantable,
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ff_zigzag_direct);
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return 0;
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}
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static av_cold void jpg_free_context(JPGContext *ctx)
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{
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int i;
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for (i = 0; i < 2; i++) {
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ff_free_vlc(&ctx->dc_vlc[i]);
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ff_free_vlc(&ctx->ac_vlc[i]);
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}
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av_freep(&ctx->buf);
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}
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static void jpg_unescape(const uint8_t *src, int src_size,
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uint8_t *dst, int *dst_size)
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{
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const uint8_t *src_end = src + src_size;
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uint8_t *dst_start = dst;
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while (src < src_end) {
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uint8_t x = *src++;
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*dst++ = x;
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if (x == 0xFF && !*src)
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src++;
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}
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*dst_size = dst - dst_start;
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}
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static int jpg_decode_block(JPGContext *c, GetBitContext *gb,
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int plane, int16_t *block)
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{
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int dc, val, pos;
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const int is_chroma = !!plane;
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const uint8_t *qmat = is_chroma ? chroma_quant : luma_quant;
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c->dsp.clear_block(block);
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dc = get_vlc2(gb, c->dc_vlc[is_chroma].table, 9, 3);
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if (dc < 0)
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return AVERROR_INVALIDDATA;
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if (dc)
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dc = get_xbits(gb, dc);
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dc = dc * qmat[0] + c->prev_dc[plane];
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block[0] = dc;
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c->prev_dc[plane] = dc;
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pos = 0;
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while (pos < 63) {
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val = get_vlc2(gb, c->ac_vlc[is_chroma].table, 9, 3);
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if (val < 0)
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return AVERROR_INVALIDDATA;
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pos += val >> 4;
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val &= 0xF;
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if (pos > 63)
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return val ? AVERROR_INVALIDDATA : 0;
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if (val) {
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int nbits = val;
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val = get_xbits(gb, nbits);
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val *= qmat[ff_zigzag_direct[pos]];
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block[c->scantable.permutated[pos]] = val;
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}
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}
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return 0;
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}
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static inline void yuv2rgb(uint8_t *out, int Y, int U, int V)
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{
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out[0] = av_clip_uint8(Y + ( 91881 * V + 32768 >> 16));
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out[1] = av_clip_uint8(Y + (-22554 * U - 46802 * V + 32768 >> 16));
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out[2] = av_clip_uint8(Y + (116130 * U + 32768 >> 16));
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}
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static int jpg_decode_data(JPGContext *c, int width, int height,
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const uint8_t *src, int src_size,
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uint8_t *dst, int dst_stride,
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const uint8_t *mask, int mask_stride, int num_mbs,
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int swapuv)
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{
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GetBitContext gb;
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int mb_w, mb_h, mb_x, mb_y, i, j;
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int bx, by;
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int unesc_size;
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int ret;
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if ((ret = av_reallocp(&c->buf,
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src_size + FF_INPUT_BUFFER_PADDING_SIZE)) < 0)
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return ret;
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jpg_unescape(src, src_size, c->buf, &unesc_size);
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memset(c->buf + unesc_size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
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init_get_bits(&gb, c->buf, unesc_size * 8);
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width = FFALIGN(width, 16);
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mb_w = width >> 4;
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mb_h = (height + 15) >> 4;
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if (!num_mbs)
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num_mbs = mb_w * mb_h * 4;
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for (i = 0; i < 3; i++)
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c->prev_dc[i] = 1024;
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bx = by = 0;
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c->dsp.clear_blocks(c->block[0]);
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for (mb_y = 0; mb_y < mb_h; mb_y++) {
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for (mb_x = 0; mb_x < mb_w; mb_x++) {
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if (mask && !mask[mb_x * 2] && !mask[mb_x * 2 + 1] &&
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!mask[mb_x * 2 + mask_stride] &&
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!mask[mb_x * 2 + 1 + mask_stride]) {
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bx += 16;
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continue;
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}
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for (j = 0; j < 2; j++) {
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for (i = 0; i < 2; i++) {
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if (mask && !mask[mb_x * 2 + i + j * mask_stride])
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continue;
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num_mbs--;
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if ((ret = jpg_decode_block(c, &gb, 0,
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c->block[i + j * 2])) != 0)
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return ret;
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c->dsp.idct(c->block[i + j * 2]);
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}
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}
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for (i = 1; i < 3; i++) {
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if ((ret = jpg_decode_block(c, &gb, i, c->block[i + 3])) != 0)
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return ret;
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c->dsp.idct(c->block[i + 3]);
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}
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for (j = 0; j < 16; j++) {
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uint8_t *out = dst + bx * 3 + (by + j) * dst_stride;
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for (i = 0; i < 16; i++) {
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int Y, U, V;
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Y = c->block[(j >> 3) * 2 + (i >> 3)][(i & 7) + (j & 7) * 8];
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U = c->block[4 ^ swapuv][(i >> 1) + (j >> 1) * 8] - 128;
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V = c->block[5 ^ swapuv][(i >> 1) + (j >> 1) * 8] - 128;
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yuv2rgb(out + i * 3, Y, U, V);
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}
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}
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if (!num_mbs)
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return 0;
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bx += 16;
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}
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bx = 0;
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by += 16;
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if (mask)
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mask += mask_stride * 2;
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}
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return 0;
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}
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static void kempf_restore_buf(const uint8_t *src, int len,
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uint8_t *dst, int stride,
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const uint8_t *jpeg_tile, int tile_stride,
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int width, int height,
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const uint8_t *pal, int npal, int tidx)
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{
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GetBitContext gb;
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int i, j, nb, col;
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init_get_bits(&gb, src, len * 8);
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if (npal <= 2) nb = 1;
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else if (npal <= 4) nb = 2;
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else if (npal <= 16) nb = 4;
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else nb = 8;
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for (j = 0; j < height; j++, dst += stride, jpeg_tile += tile_stride) {
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if (get_bits(&gb, 8))
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continue;
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for (i = 0; i < width; i++) {
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col = get_bits(&gb, nb);
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if (col != tidx)
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memcpy(dst + i * 3, pal + col * 3, 3);
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else
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memcpy(dst + i * 3, jpeg_tile + i * 3, 3);
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}
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}
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}
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static int kempf_decode_tile(G2MContext *c, int tile_x, int tile_y,
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const uint8_t *src, int src_size)
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{
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int width, height;
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int hdr, zsize, npal, tidx = -1, ret;
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int i, j;
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const uint8_t *src_end = src + src_size;
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uint8_t pal[768], transp[3];
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uLongf dlen = (c->tile_width + 1) * c->tile_height;
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int sub_type;
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int nblocks, cblocks, bstride;
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int bits, bitbuf, coded;
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uint8_t *dst = c->framebuf + tile_x * c->tile_width * 3 +
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tile_y * c->tile_height * c->framebuf_stride;
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if (src_size < 2)
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return AVERROR_INVALIDDATA;
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width = FFMIN(c->width - tile_x * c->tile_width, c->tile_width);
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height = FFMIN(c->height - tile_y * c->tile_height, c->tile_height);
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hdr = *src++;
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sub_type = hdr >> 5;
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if (sub_type == 0) {
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int j;
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memcpy(transp, src, 3);
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src += 3;
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for (j = 0; j < height; j++, dst += c->framebuf_stride)
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for (i = 0; i < width; i++)
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memcpy(dst + i * 3, transp, 3);
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return 0;
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} else if (sub_type == 1) {
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return jpg_decode_data(&c->jc, width, height, src, src_end - src,
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dst, c->framebuf_stride, NULL, 0, 0, 0);
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}
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if (sub_type != 2) {
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memcpy(transp, src, 3);
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src += 3;
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}
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npal = *src++ + 1;
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memcpy(pal, src, npal * 3); src += npal * 3;
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if (sub_type != 2) {
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for (i = 0; i < npal; i++) {
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if (!memcmp(pal + i * 3, transp, 3)) {
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tidx = i;
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break;
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}
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}
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}
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if (src_end - src < 2)
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return 0;
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zsize = (src[0] << 8) | src[1]; src += 2;
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if (src_end - src < zsize)
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return AVERROR_INVALIDDATA;
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ret = uncompress(c->kempf_buf, &dlen, src, zsize);
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if (ret)
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return AVERROR_INVALIDDATA;
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src += zsize;
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if (sub_type == 2) {
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kempf_restore_buf(c->kempf_buf, dlen, dst, c->framebuf_stride,
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NULL, 0, width, height, pal, npal, tidx);
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return 0;
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}
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nblocks = *src++ + 1;
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cblocks = 0;
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bstride = FFALIGN(width, 16) >> 3;
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// blocks are coded LSB and we need normal bitreader for JPEG data
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bits = 0;
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for (i = 0; i < (FFALIGN(height, 16) >> 4); i++) {
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for (j = 0; j < (FFALIGN(width, 16) >> 4); j++) {
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if (!bits) {
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bitbuf = *src++;
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bits = 8;
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}
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coded = bitbuf & 1;
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bits--;
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bitbuf >>= 1;
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cblocks += coded;
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if (cblocks > nblocks)
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return AVERROR_INVALIDDATA;
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c->kempf_flags[j * 2 + i * 2 * bstride] =
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c->kempf_flags[j * 2 + 1 + i * 2 * bstride] =
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c->kempf_flags[j * 2 + (i * 2 + 1) * bstride] =
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c->kempf_flags[j * 2 + 1 + (i * 2 + 1) * bstride] = coded;
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}
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}
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memset(c->jpeg_tile, 0, c->tile_stride * height);
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jpg_decode_data(&c->jc, width, height, src, src_end - src,
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c->jpeg_tile, c->tile_stride,
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c->kempf_flags, bstride, nblocks * 4, 0);
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kempf_restore_buf(c->kempf_buf, dlen, dst, c->framebuf_stride,
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c->jpeg_tile, c->tile_stride,
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width, height, pal, npal, tidx);
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return 0;
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}
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static int g2m_init_buffers(G2MContext *c)
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{
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int aligned_height;
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if (!c->framebuf || c->old_width < c->width || c->old_height < c->height) {
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c->framebuf_stride = FFALIGN(c->width * 3, 16);
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aligned_height = FFALIGN(c->height, 16);
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av_free(c->framebuf);
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c->framebuf = av_mallocz(c->framebuf_stride * aligned_height);
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if (!c->framebuf)
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return AVERROR(ENOMEM);
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}
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if (!c->synth_tile || !c->jpeg_tile ||
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c->old_tile_w < c->tile_width ||
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c->old_tile_h < c->tile_height) {
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c->tile_stride = FFALIGN(c->tile_width * 3, 16);
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aligned_height = FFALIGN(c->tile_height, 16);
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av_free(c->synth_tile);
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av_free(c->jpeg_tile);
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av_free(c->kempf_buf);
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av_free(c->kempf_flags);
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c->synth_tile = av_mallocz(c->tile_stride * aligned_height);
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c->jpeg_tile = av_mallocz(c->tile_stride * aligned_height);
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c->kempf_buf = av_mallocz((c->tile_width + 1) * aligned_height
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+ FF_INPUT_BUFFER_PADDING_SIZE);
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c->kempf_flags = av_mallocz( c->tile_width * aligned_height);
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if (!c->synth_tile || !c->jpeg_tile ||
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!c->kempf_buf || !c->kempf_flags)
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return AVERROR(ENOMEM);
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}
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|
|
|
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, 32) * 4;
|
|
|
|
if (cursor_w < 1 || cursor_w > 256 ||
|
|
cursor_h < 1 || cursor_h > 256) {
|
|
av_log(avctx, AV_LOG_ERROR, "Invalid cursor dimensions %dx%d\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 %d,%d\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 %d/%d\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_stride - c->cursor_w * 4;
|
|
}
|
|
|
|
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;
|
|
}
|
|
}
|
|
dst += c->cursor_stride - c->cursor_w * 4;
|
|
}
|
|
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;
|
|
}
|
|
dst += c->cursor_stride - c->cursor_w * 4;
|
|
}
|
|
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) > 4) {
|
|
av_log(avctx, AV_LOG_ERROR, "Wrong magic %08X\n", magic);
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
|
|
if ((magic & 0xF) != 4) {
|
|
av_log(avctx, AV_LOG_ERROR, "G2M2 and G2M3 are not yet supported\n");
|
|
return AVERROR(ENOSYS);
|
|
}
|
|
|
|
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 %d type %02X\n",
|
|
chunk_size, chunk_type);
|
|
break;
|
|
}
|
|
switch (chunk_type) {
|
|
case DISPLAY_INFO:
|
|
c->got_header = 0;
|
|
if (chunk_size < 21) {
|
|
av_log(avctx, AV_LOG_ERROR, "Invalid display info size %d\n",
|
|
chunk_size);
|
|
break;
|
|
}
|
|
c->width = bytestream2_get_be32(&bc);
|
|
c->height = bytestream2_get_be32(&bc);
|
|
if (c->width < 16 || c->width > avctx->width ||
|
|
c->height < 16 || c->height > avctx->height) {
|
|
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)
|
|
ff_set_dimensions(avctx, c->width, c->height);
|
|
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);
|
|
return AVERROR_PATCHWELCOME;
|
|
}
|
|
c->tile_width = bytestream2_get_be32(&bc);
|
|
c->tile_height = bytestream2_get_be32(&bc);
|
|
if (!c->tile_width || !c->tile_height ||
|
|
((c->tile_width | c->tile_height) & 0xF)) {
|
|
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");
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
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=%X, G=%X, B=%X\n",
|
|
r_mask, g_mask, b_mask);
|
|
return AVERROR_PATCHWELCOME;
|
|
}
|
|
} else {
|
|
avpriv_request_sample(avctx, "bpp=%d", c->bpp);
|
|
return AVERROR_PATCHWELCOME;
|
|
}
|
|
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 %d\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:
|
|
av_log(avctx, AV_LOG_ERROR,
|
|
"ePIC j-b compression is not implemented yet\n");
|
|
return AVERROR(ENOSYS);
|
|
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 %d\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 %d\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 %02X\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) {
|
|
if ((ret = ff_get_buffer(avctx, pic, 0)) < 0) {
|
|
av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
|
|
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;
|
|
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;
|
|
|
|
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->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 = CODEC_CAP_DR1,
|
|
};
|