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545 lines
19 KiB
C
545 lines
19 KiB
C
/*
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* Flash Screen Video decoder
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* Copyright (C) 2004 Alex Beregszaszi
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* Copyright (C) 2006 Benjamin Larsson
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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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* Flash Screen Video decoder
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* @author Alex Beregszaszi
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* @author Benjamin Larsson
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* @author Daniel Verkamp
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* @author Konstantin Shishkov
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*
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* A description of the bitstream format for Flash Screen Video version 1/2
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* is part of the SWF File Format Specification (version 10), which can be
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* downloaded from http://www.adobe.com/devnet/swf.html.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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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 "get_bits.h"
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#include "internal.h"
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typedef struct BlockInfo {
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uint8_t *pos;
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int size;
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} BlockInfo;
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typedef struct FlashSVContext {
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AVCodecContext *avctx;
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AVFrame frame;
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int image_width, image_height;
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int block_width, block_height;
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uint8_t *tmpblock;
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int block_size;
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z_stream zstream;
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int ver;
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const uint32_t *pal;
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int is_keyframe;
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uint8_t *keyframedata;
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uint8_t *keyframe;
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BlockInfo *blocks;
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uint8_t *deflate_block;
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int deflate_block_size;
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int color_depth;
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int zlibprime_curr, zlibprime_prev;
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int diff_start, diff_height;
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} FlashSVContext;
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static int decode_hybrid(const uint8_t *sptr, uint8_t *dptr, int dx, int dy,
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int h, int w, int stride, const uint32_t *pal)
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{
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int x, y;
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const uint8_t *orig_src = sptr;
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for (y = dx+h; y > dx; y--) {
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uint8_t *dst = dptr + (y * stride) + dy * 3;
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for (x = 0; x < w; x++) {
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if (*sptr & 0x80) {
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/* 15-bit color */
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unsigned c = AV_RB16(sptr) & ~0x8000;
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unsigned b = c & 0x1F;
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unsigned g = (c >> 5) & 0x1F;
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unsigned r = c >> 10;
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/* 000aaabb -> aaabbaaa */
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*dst++ = (b << 3) | (b >> 2);
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*dst++ = (g << 3) | (g >> 2);
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*dst++ = (r << 3) | (r >> 2);
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sptr += 2;
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} else {
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/* palette index */
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uint32_t c = pal[*sptr++];
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bytestream_put_le24(&dst, c);
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}
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}
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}
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return sptr - orig_src;
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}
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static av_cold int flashsv_decode_init(AVCodecContext *avctx)
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{
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FlashSVContext *s = avctx->priv_data;
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int zret; // Zlib return code
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s->avctx = avctx;
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s->zstream.zalloc = Z_NULL;
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s->zstream.zfree = Z_NULL;
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s->zstream.opaque = Z_NULL;
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zret = inflateInit(&s->zstream);
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if (zret != Z_OK) {
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av_log(avctx, AV_LOG_ERROR, "Inflate init error: %d\n", zret);
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return 1;
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}
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avctx->pix_fmt = AV_PIX_FMT_BGR24;
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avcodec_get_frame_defaults(&s->frame);
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return 0;
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}
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static int flashsv2_prime(FlashSVContext *s, uint8_t *src, int size)
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{
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z_stream zs;
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int zret; // Zlib return code
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zs.zalloc = NULL;
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zs.zfree = NULL;
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zs.opaque = NULL;
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s->zstream.next_in = src;
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s->zstream.avail_in = size;
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s->zstream.next_out = s->tmpblock;
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s->zstream.avail_out = s->block_size * 3;
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inflate(&s->zstream, Z_SYNC_FLUSH);
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deflateInit(&zs, 0);
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zs.next_in = s->tmpblock;
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zs.avail_in = s->block_size * 3 - s->zstream.avail_out;
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zs.next_out = s->deflate_block;
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zs.avail_out = s->deflate_block_size;
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deflate(&zs, Z_SYNC_FLUSH);
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deflateEnd(&zs);
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if ((zret = inflateReset(&s->zstream)) != Z_OK) {
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av_log(s->avctx, AV_LOG_ERROR, "Inflate reset error: %d\n", zret);
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return AVERROR_UNKNOWN;
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}
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s->zstream.next_in = s->deflate_block;
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s->zstream.avail_in = s->deflate_block_size - zs.avail_out;
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s->zstream.next_out = s->tmpblock;
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s->zstream.avail_out = s->block_size * 3;
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inflate(&s->zstream, Z_SYNC_FLUSH);
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return 0;
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}
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static int flashsv_decode_block(AVCodecContext *avctx, AVPacket *avpkt,
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GetBitContext *gb, int block_size,
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int width, int height, int x_pos, int y_pos,
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int blk_idx)
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{
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struct FlashSVContext *s = avctx->priv_data;
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uint8_t *line = s->tmpblock;
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int k;
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int ret = inflateReset(&s->zstream);
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if (ret != Z_OK) {
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av_log(avctx, AV_LOG_ERROR, "Inflate reset error: %d\n", ret);
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return AVERROR_UNKNOWN;
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}
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if (s->zlibprime_curr || s->zlibprime_prev) {
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ret = flashsv2_prime(s,
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s->blocks[blk_idx].pos,
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s->blocks[blk_idx].size);
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if (ret < 0)
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return ret;
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}
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s->zstream.next_in = avpkt->data + get_bits_count(gb) / 8;
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s->zstream.avail_in = block_size;
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s->zstream.next_out = s->tmpblock;
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s->zstream.avail_out = s->block_size * 3;
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ret = inflate(&s->zstream, Z_FINISH);
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if (ret == Z_DATA_ERROR) {
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av_log(avctx, AV_LOG_ERROR, "Zlib resync occurred\n");
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inflateSync(&s->zstream);
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ret = inflate(&s->zstream, Z_FINISH);
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}
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if (ret != Z_OK && ret != Z_STREAM_END) {
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//return -1;
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}
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if (s->is_keyframe) {
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s->blocks[blk_idx].pos = s->keyframedata + (get_bits_count(gb) / 8);
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s->blocks[blk_idx].size = block_size;
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}
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if (!s->color_depth) {
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/* Flash Screen Video stores the image upside down, so copy
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* lines to destination in reverse order. */
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for (k = 1; k <= s->diff_height; k++) {
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memcpy(s->frame.data[0] + x_pos * 3 +
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(s->image_height - y_pos - s->diff_start - k) * s->frame.linesize[0],
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line, width * 3);
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/* advance source pointer to next line */
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line += width * 3;
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}
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} else {
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/* hybrid 15-bit/palette mode */
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decode_hybrid(s->tmpblock, s->frame.data[0],
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s->image_height - (y_pos + 1 + s->diff_start + s->diff_height),
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x_pos, s->diff_height, width,
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s->frame.linesize[0], s->pal);
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}
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skip_bits_long(gb, 8 * block_size); /* skip the consumed bits */
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return 0;
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}
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static int calc_deflate_block_size(int tmpblock_size)
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{
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z_stream zstream;
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int size;
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zstream.zalloc = Z_NULL;
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zstream.zfree = Z_NULL;
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zstream.opaque = Z_NULL;
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if (deflateInit(&zstream, 0) != Z_OK)
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return -1;
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size = deflateBound(&zstream, tmpblock_size);
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deflateEnd(&zstream);
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return size;
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}
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static int flashsv_decode_frame(AVCodecContext *avctx, void *data,
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int *got_frame, AVPacket *avpkt)
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{
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int buf_size = avpkt->size;
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FlashSVContext *s = avctx->priv_data;
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int h_blocks, v_blocks, h_part, v_part, i, j, ret;
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GetBitContext gb;
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/* no supplementary picture */
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if (buf_size == 0)
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return 0;
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if (buf_size < 4)
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return -1;
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init_get_bits(&gb, avpkt->data, buf_size * 8);
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/* start to parse the bitstream */
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s->block_width = 16 * (get_bits(&gb, 4) + 1);
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s->image_width = get_bits(&gb, 12);
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s->block_height = 16 * (get_bits(&gb, 4) + 1);
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s->image_height = get_bits(&gb, 12);
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if (s->ver == 2) {
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skip_bits(&gb, 6);
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if (get_bits1(&gb)) {
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avpriv_request_sample(avctx, "iframe");
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return AVERROR_PATCHWELCOME;
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}
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if (get_bits1(&gb)) {
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avpriv_request_sample(avctx, "Custom palette");
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return AVERROR_PATCHWELCOME;
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}
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}
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/* calculate number of blocks and size of border (partial) blocks */
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h_blocks = s->image_width / s->block_width;
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h_part = s->image_width % s->block_width;
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v_blocks = s->image_height / s->block_height;
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v_part = s->image_height % s->block_height;
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/* the block size could change between frames, make sure the buffer
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* is large enough, if not, get a larger one */
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if (s->block_size < s->block_width * s->block_height) {
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int tmpblock_size = 3 * s->block_width * s->block_height;
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s->tmpblock = av_realloc(s->tmpblock, tmpblock_size);
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if (!s->tmpblock) {
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av_log(avctx, AV_LOG_ERROR, "Can't allocate decompression buffer.\n");
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return AVERROR(ENOMEM);
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}
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if (s->ver == 2) {
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s->deflate_block_size = calc_deflate_block_size(tmpblock_size);
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if (s->deflate_block_size <= 0) {
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av_log(avctx, AV_LOG_ERROR, "Can't determine deflate buffer size.\n");
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return -1;
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}
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s->deflate_block = av_realloc(s->deflate_block, s->deflate_block_size);
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if (!s->deflate_block) {
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av_log(avctx, AV_LOG_ERROR, "Can't allocate deflate buffer.\n");
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return AVERROR(ENOMEM);
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}
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}
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}
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s->block_size = s->block_width * s->block_height;
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/* initialize the image size once */
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if (avctx->width == 0 && avctx->height == 0) {
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avctx->width = s->image_width;
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avctx->height = s->image_height;
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}
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/* check for changes of image width and image height */
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if (avctx->width != s->image_width || avctx->height != s->image_height) {
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av_log(avctx, AV_LOG_ERROR,
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"Frame width or height differs from first frame!\n");
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av_log(avctx, AV_LOG_ERROR, "fh = %d, fv %d vs ch = %d, cv = %d\n",
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avctx->height, avctx->width, s->image_height, s->image_width);
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return AVERROR_INVALIDDATA;
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}
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/* we care for keyframes only in Screen Video v2 */
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s->is_keyframe = (avpkt->flags & AV_PKT_FLAG_KEY) && (s->ver == 2);
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if (s->is_keyframe) {
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s->keyframedata = av_realloc(s->keyframedata, avpkt->size);
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memcpy(s->keyframedata, avpkt->data, avpkt->size);
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s->blocks = av_realloc(s->blocks,
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(v_blocks + !!v_part) * (h_blocks + !!h_part)
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* sizeof(s->blocks[0]));
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}
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av_dlog(avctx, "image: %dx%d block: %dx%d num: %dx%d part: %dx%d\n",
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s->image_width, s->image_height, s->block_width, s->block_height,
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h_blocks, v_blocks, h_part, v_part);
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if ((ret = ff_reget_buffer(avctx, &s->frame)) < 0) {
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av_log(avctx, AV_LOG_ERROR, "reget_buffer() failed\n");
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return ret;
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}
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/* loop over all block columns */
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for (j = 0; j < v_blocks + (v_part ? 1 : 0); j++) {
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int y_pos = j * s->block_height; // vertical position in frame
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int cur_blk_height = (j < v_blocks) ? s->block_height : v_part;
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/* loop over all block rows */
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for (i = 0; i < h_blocks + (h_part ? 1 : 0); i++) {
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int x_pos = i * s->block_width; // horizontal position in frame
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int cur_blk_width = (i < h_blocks) ? s->block_width : h_part;
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int has_diff = 0;
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/* get the size of the compressed zlib chunk */
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int size = get_bits(&gb, 16);
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s->color_depth = 0;
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s->zlibprime_curr = 0;
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s->zlibprime_prev = 0;
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s->diff_start = 0;
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s->diff_height = cur_blk_height;
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if (8 * size > get_bits_left(&gb)) {
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av_frame_unref(&s->frame);
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return AVERROR_INVALIDDATA;
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}
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if (s->ver == 2 && size) {
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skip_bits(&gb, 3);
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s->color_depth = get_bits(&gb, 2);
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has_diff = get_bits1(&gb);
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s->zlibprime_curr = get_bits1(&gb);
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s->zlibprime_prev = get_bits1(&gb);
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if (s->color_depth != 0 && s->color_depth != 2) {
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av_log(avctx, AV_LOG_ERROR,
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"%dx%d invalid color depth %d\n", i, j, s->color_depth);
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return AVERROR_INVALIDDATA;
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}
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if (has_diff) {
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if (!s->keyframe) {
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av_log(avctx, AV_LOG_ERROR,
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"inter frame without keyframe\n");
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return AVERROR_INVALIDDATA;
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}
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s->diff_start = get_bits(&gb, 8);
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s->diff_height = get_bits(&gb, 8);
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av_log(avctx, AV_LOG_DEBUG,
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"%dx%d diff start %d height %d\n",
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i, j, s->diff_start, s->diff_height);
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size -= 2;
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}
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if (s->zlibprime_prev)
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av_log(avctx, AV_LOG_DEBUG, "%dx%d zlibprime_prev\n", i, j);
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if (s->zlibprime_curr) {
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int col = get_bits(&gb, 8);
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int row = get_bits(&gb, 8);
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av_log(avctx, AV_LOG_DEBUG, "%dx%d zlibprime_curr %dx%d\n", i, j, col, row);
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size -= 2;
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avpriv_request_sample(avctx, "zlibprime_curr");
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return AVERROR_PATCHWELCOME;
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}
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if (!s->blocks && (s->zlibprime_curr || s->zlibprime_prev)) {
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av_log(avctx, AV_LOG_ERROR, "no data available for zlib "
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"priming\n");
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return AVERROR_INVALIDDATA;
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}
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size--; // account for flags byte
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}
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if (has_diff) {
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int k;
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int off = (s->image_height - y_pos - 1) * s->frame.linesize[0];
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for (k = 0; k < cur_blk_height; k++)
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memcpy(s->frame.data[0] + off - k*s->frame.linesize[0] + x_pos*3,
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s->keyframe + off - k*s->frame.linesize[0] + x_pos*3,
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cur_blk_width * 3);
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}
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/* skip unchanged blocks, which have size 0 */
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if (size) {
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if (flashsv_decode_block(avctx, avpkt, &gb, size,
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cur_blk_width, cur_blk_height,
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x_pos, y_pos,
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i + j * (h_blocks + !!h_part)))
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av_log(avctx, AV_LOG_ERROR,
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"error in decompression of block %dx%d\n", i, j);
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}
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}
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}
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if (s->is_keyframe && s->ver == 2) {
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if (!s->keyframe) {
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s->keyframe = av_malloc(s->frame.linesize[0] * avctx->height);
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if (!s->keyframe) {
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av_log(avctx, AV_LOG_ERROR, "Cannot allocate image data\n");
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return AVERROR(ENOMEM);
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}
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}
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memcpy(s->keyframe, s->frame.data[0], s->frame.linesize[0] * avctx->height);
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}
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if ((ret = av_frame_ref(data, &s->frame)) < 0)
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return ret;
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*got_frame = 1;
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if ((get_bits_count(&gb) / 8) != buf_size)
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av_log(avctx, AV_LOG_ERROR, "buffer not fully consumed (%d != %d)\n",
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buf_size, (get_bits_count(&gb) / 8));
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/* report that the buffer was completely consumed */
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return buf_size;
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}
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static av_cold int flashsv_decode_end(AVCodecContext *avctx)
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{
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FlashSVContext *s = avctx->priv_data;
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inflateEnd(&s->zstream);
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/* release the frame if needed */
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av_frame_unref(&s->frame);
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/* free the tmpblock */
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av_free(s->tmpblock);
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return 0;
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}
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#if CONFIG_FLASHSV_DECODER
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AVCodec ff_flashsv_decoder = {
|
|
.name = "flashsv",
|
|
.type = AVMEDIA_TYPE_VIDEO,
|
|
.id = AV_CODEC_ID_FLASHSV,
|
|
.priv_data_size = sizeof(FlashSVContext),
|
|
.init = flashsv_decode_init,
|
|
.close = flashsv_decode_end,
|
|
.decode = flashsv_decode_frame,
|
|
.capabilities = CODEC_CAP_DR1,
|
|
.pix_fmts = (const enum AVPixelFormat[]){ AV_PIX_FMT_BGR24, AV_PIX_FMT_NONE },
|
|
.long_name = NULL_IF_CONFIG_SMALL("Flash Screen Video v1"),
|
|
};
|
|
#endif /* CONFIG_FLASHSV_DECODER */
|
|
|
|
#if CONFIG_FLASHSV2_DECODER
|
|
static const uint32_t ff_flashsv2_default_palette[128] = {
|
|
0x000000, 0x333333, 0x666666, 0x999999, 0xCCCCCC, 0xFFFFFF,
|
|
0x330000, 0x660000, 0x990000, 0xCC0000, 0xFF0000, 0x003300,
|
|
0x006600, 0x009900, 0x00CC00, 0x00FF00, 0x000033, 0x000066,
|
|
0x000099, 0x0000CC, 0x0000FF, 0x333300, 0x666600, 0x999900,
|
|
0xCCCC00, 0xFFFF00, 0x003333, 0x006666, 0x009999, 0x00CCCC,
|
|
0x00FFFF, 0x330033, 0x660066, 0x990099, 0xCC00CC, 0xFF00FF,
|
|
0xFFFF33, 0xFFFF66, 0xFFFF99, 0xFFFFCC, 0xFF33FF, 0xFF66FF,
|
|
0xFF99FF, 0xFFCCFF, 0x33FFFF, 0x66FFFF, 0x99FFFF, 0xCCFFFF,
|
|
0xCCCC33, 0xCCCC66, 0xCCCC99, 0xCCCCFF, 0xCC33CC, 0xCC66CC,
|
|
0xCC99CC, 0xCCFFCC, 0x33CCCC, 0x66CCCC, 0x99CCCC, 0xFFCCCC,
|
|
0x999933, 0x999966, 0x9999CC, 0x9999FF, 0x993399, 0x996699,
|
|
0x99CC99, 0x99FF99, 0x339999, 0x669999, 0xCC9999, 0xFF9999,
|
|
0x666633, 0x666699, 0x6666CC, 0x6666FF, 0x663366, 0x669966,
|
|
0x66CC66, 0x66FF66, 0x336666, 0x996666, 0xCC6666, 0xFF6666,
|
|
0x333366, 0x333399, 0x3333CC, 0x3333FF, 0x336633, 0x339933,
|
|
0x33CC33, 0x33FF33, 0x663333, 0x993333, 0xCC3333, 0xFF3333,
|
|
0x003366, 0x336600, 0x660033, 0x006633, 0x330066, 0x663300,
|
|
0x336699, 0x669933, 0x993366, 0x339966, 0x663399, 0x996633,
|
|
0x6699CC, 0x99CC66, 0xCC6699, 0x66CC99, 0x9966CC, 0xCC9966,
|
|
0x99CCFF, 0xCCFF99, 0xFF99CC, 0x99FFCC, 0xCC99FF, 0xFFCC99,
|
|
0x111111, 0x222222, 0x444444, 0x555555, 0xAAAAAA, 0xBBBBBB,
|
|
0xDDDDDD, 0xEEEEEE
|
|
};
|
|
|
|
static av_cold int flashsv2_decode_init(AVCodecContext *avctx)
|
|
{
|
|
FlashSVContext *s = avctx->priv_data;
|
|
flashsv_decode_init(avctx);
|
|
s->pal = ff_flashsv2_default_palette;
|
|
s->ver = 2;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static av_cold int flashsv2_decode_end(AVCodecContext *avctx)
|
|
{
|
|
FlashSVContext *s = avctx->priv_data;
|
|
|
|
av_freep(&s->keyframedata);
|
|
av_freep(&s->blocks);
|
|
av_freep(&s->keyframe);
|
|
av_freep(&s->deflate_block);
|
|
flashsv_decode_end(avctx);
|
|
|
|
return 0;
|
|
}
|
|
|
|
AVCodec ff_flashsv2_decoder = {
|
|
.name = "flashsv2",
|
|
.type = AVMEDIA_TYPE_VIDEO,
|
|
.id = AV_CODEC_ID_FLASHSV2,
|
|
.priv_data_size = sizeof(FlashSVContext),
|
|
.init = flashsv2_decode_init,
|
|
.close = flashsv2_decode_end,
|
|
.decode = flashsv_decode_frame,
|
|
.capabilities = CODEC_CAP_DR1,
|
|
.pix_fmts = (const enum AVPixelFormat[]){ AV_PIX_FMT_BGR24, AV_PIX_FMT_NONE },
|
|
.long_name = NULL_IF_CONFIG_SMALL("Flash Screen Video v2"),
|
|
};
|
|
#endif /* CONFIG_FLASHSV2_DECODER */
|