/*
* Flash Screen Video decoder
* Copyright (C) 2004 Alex Beregszaszi
* Copyright (C) 2006 Benjamin Larsson
*
* 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
* Flash Screen Video decoder
* @author Alex Beregszaszi
* @author Benjamin Larsson
* @author Daniel Verkamp
* @author Konstantin Shishkov
*
* A description of the bitstream format for Flash Screen Video version 1/2
* is part of the SWF File Format Specification (version 10), which can be
* downloaded from http://www.adobe.com/devnet/swf.html.
*/
#include <stdio.h>
#include <stdlib.h>
#include <zlib.h>
#include "libavutil/intreadwrite.h"
#include "avcodec.h"
#include "bytestream.h"
#include "get_bits.h"
#include "internal.h"
typedef struct BlockInfo {
uint8_t *pos;
int size;
} BlockInfo;
typedef struct FlashSVContext {
AVCodecContext *avctx;
AVFrame frame;
int image_width, image_height;
int block_width, block_height;
uint8_t *tmpblock;
int block_size;
z_stream zstream;
int ver;
const uint32_t *pal;
int is_keyframe;
uint8_t *keyframedata;
uint8_t *keyframe;
BlockInfo *blocks;
uint8_t *deflate_block;
int deflate_block_size;
int color_depth;
int zlibprime_curr, zlibprime_prev;
int diff_start, diff_height;
} FlashSVContext;
static int decode_hybrid(const uint8_t *sptr, uint8_t *dptr, int dx, int dy,
int h, int w, int stride, const uint32_t *pal)
{
int x, y;
const uint8_t *orig_src = sptr;
for (y = dx+h; y > dx; y--) {
uint8_t *dst = dptr + (y * stride) + dy * 3;
for (x = 0; x < w; x++) {
if (*sptr & 0x80) {
/* 15-bit color */
unsigned c = AV_RB16(sptr) & ~0x8000;
unsigned b = c & 0x1F;
unsigned g = (c >> 5) & 0x1F;
unsigned r = c >> 10;
/* 000aaabb -> aaabbaaa */
*dst++ = (b << 3) | (b >> 2);
*dst++ = (g << 3) | (g >> 2);
*dst++ = (r << 3) | (r >> 2);
sptr += 2;
} else {
/* palette index */
uint32_t c = pal[*sptr++];
bytestream_put_le24(&dst, c);
}
}
}
return sptr - orig_src;
}
static av_cold int flashsv_decode_init(AVCodecContext *avctx)
{
FlashSVContext *s = avctx->priv_data;
int zret; // Zlib return code
s->avctx = avctx;
s->zstream.zalloc = Z_NULL;
s->zstream.zfree = Z_NULL;
s->zstream.opaque = Z_NULL;
zret = inflateInit(&s->zstream);
if (zret != Z_OK) {
av_log(avctx, AV_LOG_ERROR, "Inflate init error: %d\n", zret);
return 1;
}
avctx->pix_fmt = AV_PIX_FMT_BGR24;
avcodec_get_frame_defaults(&s->frame);
return 0;
}
static int flashsv2_prime(FlashSVContext *s, uint8_t *src, int size)
{
z_stream zs;
int zret; // Zlib return code
if (!src)
return AVERROR_INVALIDDATA;
zs.zalloc = NULL;
zs.zfree = NULL;
zs.opaque = NULL;
s->zstream.next_in = src;
s->zstream.avail_in = size;
s->zstream.next_out = s->tmpblock;
s->zstream.avail_out = s->block_size * 3;
inflate(&s->zstream, Z_SYNC_FLUSH);
if (deflateInit(&zs, 0) != Z_OK)
return -1;
zs.next_in = s->tmpblock;
zs.avail_in = s->block_size * 3 - s->zstream.avail_out;
zs.next_out = s->deflate_block;
zs.avail_out = s->deflate_block_size;
deflate(&zs, Z_SYNC_FLUSH);
deflateEnd(&zs);
if ((zret = inflateReset(&s->zstream)) != Z_OK) {
av_log(s->avctx, AV_LOG_ERROR, "Inflate reset error: %d\n", zret);
return AVERROR_UNKNOWN;
}
s->zstream.next_in = s->deflate_block;
s->zstream.avail_in = s->deflate_block_size - zs.avail_out;
s->zstream.next_out = s->tmpblock;
s->zstream.avail_out = s->block_size * 3;
inflate(&s->zstream, Z_SYNC_FLUSH);
return 0;
}
static int flashsv_decode_block(AVCodecContext *avctx, AVPacket *avpkt,
GetBitContext *gb, int block_size,
int width, int height, int x_pos, int y_pos,
int blk_idx)
{
struct FlashSVContext *s = avctx->priv_data;
uint8_t *line = s->tmpblock;
int k;
int ret = inflateReset(&s->zstream);
if (ret != Z_OK) {
av_log(avctx, AV_LOG_ERROR, "Inflate reset error: %d\n", ret);
return AVERROR_UNKNOWN;
}
if (s->zlibprime_curr || s->zlibprime_prev) {
ret = flashsv2_prime(s,
s->blocks[blk_idx].pos,
s->blocks[blk_idx].size);
if (ret < 0)
return ret;
}
s->zstream.next_in = avpkt->data + get_bits_count(gb) / 8;
s->zstream.avail_in = block_size;
s->zstream.next_out = s->tmpblock;
s->zstream.avail_out = s->block_size * 3;
ret = inflate(&s->zstream, Z_FINISH);
if (ret == Z_DATA_ERROR) {
av_log(avctx, AV_LOG_ERROR, "Zlib resync occurred\n");
inflateSync(&s->zstream);
ret = inflate(&s->zstream, Z_FINISH);
}
if (ret != Z_OK && ret != Z_STREAM_END) {
//return -1;
}
if (s->is_keyframe) {
s->blocks[blk_idx].pos = s->keyframedata + (get_bits_count(gb) / 8);
s->blocks[blk_idx].size = block_size;
}
if (!s->color_depth) {
/* Flash Screen Video stores the image upside down, so copy
* lines to destination in reverse order. */
for (k = 1; k <= s->diff_height; k++) {
memcpy(s
->frame.
data[0] + x_pos
* 3 + (s->image_height - y_pos - s->diff_start - k) * s->frame.linesize[0],
line, width * 3);
/* advance source pointer to next line */
line += width * 3;
}
} else {
/* hybrid 15-bit/palette mode */
decode_hybrid(s->tmpblock, s->frame.data[0],
s->image_height - (y_pos + 1 + s->diff_start + s->diff_height),
x_pos, s->diff_height, width,
s->frame.linesize[0], s->pal);
}
skip_bits_long(gb, 8 * block_size); /* skip the consumed bits */
return 0;
}
static int calc_deflate_block_size(int tmpblock_size)
{
z_stream zstream;
int size;
zstream.zalloc = Z_NULL;
zstream.zfree = Z_NULL;
zstream.opaque = Z_NULL;
if (deflateInit(&zstream, 0) != Z_OK)
return -1;
size = deflateBound(&zstream, tmpblock_size);
deflateEnd(&zstream);
return size;
}
static int flashsv_decode_frame(AVCodecContext *avctx, void *data,
int *got_frame, AVPacket *avpkt)
{
int buf_size = avpkt->size;
FlashSVContext *s = avctx->priv_data;
int h_blocks, v_blocks, h_part, v_part, i, j, ret;
GetBitContext gb;
int last_blockwidth = s->block_width;
int last_blockheight= s->block_height;
/* no supplementary picture */
if (buf_size == 0)
return 0;
if (buf_size < 4)
return -1;
init_get_bits(&gb, avpkt->data, buf_size * 8);
/* start to parse the bitstream */
s->block_width = 16 * (get_bits(&gb, 4) + 1);
s->image_width = get_bits(&gb, 12);
s->block_height = 16 * (get_bits(&gb, 4) + 1);
s->image_height = get_bits(&gb, 12);
if ( last_blockwidth != s->block_width
|| last_blockheight!= s->block_height)
av_freep(&s->blocks);
if (s->ver == 2) {
skip_bits(&gb, 6);
if (get_bits1(&gb)) {
avpriv_request_sample(avctx, "iframe");
return AVERROR_PATCHWELCOME;
}
if (get_bits1(&gb)) {
avpriv_request_sample(avctx, "Custom palette");
return AVERROR_PATCHWELCOME;
}
}
/* calculate number of blocks and size of border (partial) blocks */
h_blocks = s->image_width / s->block_width;
h_part = s->image_width % s->block_width;
v_blocks = s->image_height / s->block_height;
v_part = s->image_height % s->block_height;
/* the block size could change between frames, make sure the buffer
* is large enough, if not, get a larger one */
if (s->block_size < s->block_width * s->block_height) {
int tmpblock_size = 3 * s->block_width * s->block_height;
s->tmpblock = av_realloc(s->tmpblock, tmpblock_size);
if (!s->tmpblock) {
av_log(avctx, AV_LOG_ERROR, "Can't allocate decompression buffer.\n");
return AVERROR(ENOMEM);
}
if (s->ver == 2) {
s->deflate_block_size = calc_deflate_block_size(tmpblock_size);
if (s->deflate_block_size <= 0) {
av_log(avctx, AV_LOG_ERROR, "Can't determine deflate buffer size.\n");
return -1;
}
s->deflate_block = av_realloc(s->deflate_block, s->deflate_block_size);
if (!s->deflate_block) {
av_log(avctx, AV_LOG_ERROR, "Can't allocate deflate buffer.\n");
return AVERROR(ENOMEM);
}
}
}
s->block_size = s->block_width * s->block_height;
/* initialize the image size once */
if (avctx->width == 0 && avctx->height == 0) {
avcodec_set_dimensions(avctx, s->image_width, s->image_height);
}
/* check for changes of image width and image height */
if (avctx->width != s->image_width || avctx->height != s->image_height) {
av_log(avctx, AV_LOG_ERROR,
"Frame width or height differs from first frame!\n");
av_log(avctx, AV_LOG_ERROR, "fh = %d, fv %d vs ch = %d, cv = %d\n",
avctx->height, avctx->width, s->image_height, s->image_width);
return AVERROR_INVALIDDATA;
}
/* we care for keyframes only in Screen Video v2 */
s->is_keyframe = (avpkt->flags & AV_PKT_FLAG_KEY) && (s->ver == 2);
if (s->is_keyframe) {
s->keyframedata = av_realloc(s->keyframedata, avpkt->size);
memcpy(s
->keyframedata
, avpkt
->data
, avpkt
->size
); }
if(s->ver == 2 && !s->blocks)
s->blocks = av_mallocz((v_blocks + !!v_part) * (h_blocks + !!h_part)
* sizeof(s->blocks[0]));
av_dlog(avctx, "image: %dx%d block: %dx%d num: %dx%d part: %dx%d\n",
s->image_width, s->image_height, s->block_width, s->block_height,
h_blocks, v_blocks, h_part, v_part);
if ((ret = ff_reget_buffer(avctx, &s->frame)) < 0)
return ret;
/* loop over all block columns */
for (j = 0; j < v_blocks + (v_part ? 1 : 0); j++) {
int y_pos = j * s->block_height; // vertical position in frame
int cur_blk_height = (j < v_blocks) ? s->block_height : v_part;
/* loop over all block rows */
for (i = 0; i < h_blocks + (h_part ? 1 : 0); i++) {
int x_pos = i * s->block_width; // horizontal position in frame
int cur_blk_width = (i < h_blocks) ? s->block_width : h_part;
int has_diff = 0;
/* get the size of the compressed zlib chunk */
int size = get_bits(&gb, 16);
s->color_depth = 0;
s->zlibprime_curr = 0;
s->zlibprime_prev = 0;
s->diff_start = 0;
s->diff_height = cur_blk_height;
if (8 * size > get_bits_left(&gb)) {
av_frame_unref(&s->frame);
return AVERROR_INVALIDDATA;
}
if (s->ver == 2 && size) {
skip_bits(&gb, 3);
s->color_depth = get_bits(&gb, 2);
has_diff = get_bits1(&gb);
s->zlibprime_curr = get_bits1(&gb);
s->zlibprime_prev = get_bits1(&gb);
if (s->color_depth != 0 && s->color_depth != 2) {
av_log(avctx, AV_LOG_ERROR,
"%dx%d invalid color depth %d\n", i, j, s->color_depth);
return AVERROR_INVALIDDATA;
}
if (has_diff) {
if (!s->keyframe) {
av_log(avctx, AV_LOG_ERROR,
"inter frame without keyframe\n");
return AVERROR_INVALIDDATA;
}
s->diff_start = get_bits(&gb, 8);
s->diff_height = get_bits(&gb, 8);
if (s->diff_start + s->diff_height > cur_blk_height) {
av_log(avctx, AV_LOG_ERROR, "Block parameters invalid\n");
return AVERROR_INVALIDDATA;
}
av_log(avctx, AV_LOG_DEBUG,
"%dx%d diff start %d height %d\n",
i, j, s->diff_start, s->diff_height);
size -= 2;
}
if (s->zlibprime_prev)
av_log(avctx, AV_LOG_DEBUG, "%dx%d zlibprime_prev\n", i, j);
if (s->zlibprime_curr) {
int col = get_bits(&gb, 8);
int row = get_bits(&gb, 8);
av_log(avctx, AV_LOG_DEBUG, "%dx%d zlibprime_curr %dx%d\n", i, j, col, row);
size -= 2;
avpriv_request_sample(avctx, "zlibprime_curr");
return AVERROR_PATCHWELCOME;
}
if (!s->blocks && (s->zlibprime_curr || s->zlibprime_prev)) {
av_log(avctx, AV_LOG_ERROR, "no data available for zlib "
"priming\n");
return AVERROR_INVALIDDATA;
}
size--; // account for flags byte
}
if (has_diff) {
int k;
int off = (s->image_height - y_pos - 1) * s->frame.linesize[0];
for (k = 0; k < cur_blk_height; k++)
memcpy(s
->frame.
data[0] + off
- k
*s
->frame.
linesize[0] + x_pos
*3, s->keyframe + off - k*s->frame.linesize[0] + x_pos*3,
cur_blk_width * 3);
}
/* skip unchanged blocks, which have size 0 */
if (size) {
if (flashsv_decode_block(avctx, avpkt, &gb, size,
cur_blk_width, cur_blk_height,
x_pos, y_pos,
i + j * (h_blocks + !!h_part)))
av_log(avctx, AV_LOG_ERROR,
"error in decompression of block %dx%d\n", i, j);
}
}
}
if (s->is_keyframe && s->ver == 2) {
if (!s->keyframe) {
s->keyframe = av_malloc(s->frame.linesize[0] * avctx->height);
if (!s->keyframe) {
av_log(avctx, AV_LOG_ERROR, "Cannot allocate image data\n");
return AVERROR(ENOMEM);
}
}
memcpy(s
->keyframe
, s
->frame.
data[0], s
->frame.
linesize[0] * avctx
->height
); }
if ((ret = av_frame_ref(data, &s->frame)) < 0)
return ret;
*got_frame = 1;
if ((get_bits_count(&gb) / 8) != buf_size)
av_log(avctx, AV_LOG_ERROR, "buffer not fully consumed (%d != %d)\n",
buf_size, (get_bits_count(&gb) / 8));
/* report that the buffer was completely consumed */
return buf_size;
}
static av_cold int flashsv_decode_end(AVCodecContext *avctx)
{
FlashSVContext *s = avctx->priv_data;
inflateEnd(&s->zstream);
/* release the frame if needed */
av_frame_unref(&s->frame);
/* free the tmpblock */
av_free(s->tmpblock);
return 0;
}
#if CONFIG_FLASHSV_DECODER
AVCodec ff_flashsv_decoder = {
.name = "flashsv",
.long_name = NULL_IF_CONFIG_SMALL("Flash Screen Video v1"),
.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 },
};
#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",
.long_name = NULL_IF_CONFIG_SMALL("Flash Screen Video v2"),
.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 },
};
#endif /* CONFIG_FLASHSV2_DECODER */