* 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
#include <stdlib.h>
#include <zlib.h>
+#include "libavutil/intreadwrite.h"
#include "avcodec.h"
+#include "bytestream.h"
#include "get_bits.h"
+typedef struct BlockInfo {
+ uint8_t *pos;
+ int size;
+ int unp_size;
+} BlockInfo;
+
typedef struct FlashSVContext {
AVCodecContext *avctx;
AVFrame frame;
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;
}
+static void flashsv2_prime(FlashSVContext *s, uint8_t *src,
+ int size, int unp_size)
+{
+ z_stream zs;
+
+ 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);
+
+ deflateInit(&zs, 0);
+ 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);
+
+ inflateReset(&s->zstream);
+
+ 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);
+}
+
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 width, int height, int x_pos, int y_pos,
+ int blk_idx)
{
struct FlashSVContext *s = avctx->priv_data;
uint8_t *line = s->tmpblock;
if (ret != Z_OK) {
//return -1;
}
+ if (s->zlibprime_curr || s->zlibprime_prev) {
+ flashsv2_prime(s, s->blocks[blk_idx].pos, s->blocks[blk_idx].size,
+ s->blocks[blk_idx].unp_size);
+ }
s->zstream.next_in = avpkt->data + get_bits_count(gb) / 8;
s->zstream.avail_in = block_size;
s->zstream.next_out = s->tmpblock;
if (ret != Z_OK && ret != Z_STREAM_END) {
//return -1;
}
- /* Flash Screen Video stores the image upside down, so copy
- * lines to destination in reverse order. */
- for (k = 1; k <= height; k++) {
- memcpy(s->frame.data[0] + x_pos * 3 +
- (s->image_height - y_pos - k) * s->frame.linesize[0],
- line, width * 3);
- /* advance source pointer to next line */
- line += width * 3;
+
+ if (s->is_keyframe) {
+ s->blocks[blk_idx].pos = s->keyframedata + (get_bits_count(gb) / 8);
+ s->blocks[blk_idx].size = block_size;
+ s->blocks[blk_idx].unp_size = s->block_size * 3 - s->zstream.avail_out;
+ }
+ 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 *data_size, AVPacket *avpkt)
s->block_height = 16 * (get_bits(&gb, 4) + 1);
s->image_height = get_bits(&gb, 12);
+ if (s->ver == 2) {
+ skip_bits(&gb, 6);
+ if (get_bits1(&gb)) {
+ av_log_missing_feature(avctx, "iframe", 1);
+ return AVERROR_PATCHWELCOME;
+ }
+ if (get_bits1(&gb)) {
+ av_log_missing_feature(avctx, "custom palette", 1);
+ 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;
/* 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) {
- av_free(s->tmpblock);
- if ((s->tmpblock = av_malloc(3 * s->block_width * s->block_height)) == NULL) {
+ 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;
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);
+ s->blocks = av_realloc(s->blocks,
+ (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);
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)) {
avctx->release_buffer(avctx, &s->frame);
s->frame.data[0] = NULL;
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 -1;
+ }
+
+ if (has_diff) {
+ s->diff_start = get_bits(&gb, 8);
+ s->diff_height = get_bits(&gb, 8);
+ 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;
+ av_log_missing_feature(avctx, "zlibprime_curr", 1);
+ return AVERROR_PATCHWELCOME;
+ }
+ 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))
+ 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);
+ }
*data_size = sizeof(AVFrame);
*(AVFrame*)data = s->frame;
}
+#if CONFIG_FLASHSV_DECODER
AVCodec ff_flashsv_decoder = {
.name = "flashsv",
.type = AVMEDIA_TYPE_VIDEO,
.pix_fmts = (const enum PixelFormat[]){PIX_FMT_BGR24, 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 = 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 PixelFormat[]){PIX_FMT_BGR24, PIX_FMT_NONE},
+ .long_name = NULL_IF_CONFIG_SMALL("Flash Screen Video v2"),
+};
+#endif /* CONFIG_FLASHSV2_DECODER */
projects / platform / upstream / libav.git / commitdiff