* Flash Screen Video encoder
* @author Alex Beregszaszi
* @author Benjamin Larsson
+ *
+ * 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.
*/
-/* Bitstream description
- * The picture is divided into blocks that are zlib-compressed.
- *
- * The decoder is fed complete frames, the frameheader contains:
- * 4 bits of block width
- * 12 bits of frame width
- * 4 bits of block height
- * 12 bits of frame height
- *
- * Directly after the header are the compressed blocks. The blocks
- * have their compressed size represented with 16 bits in the beginning.
- * If the size = 0 then the block is unchanged from the previous frame.
- * All blocks are decompressed until the buffer is consumed.
- *
+/*
* Encoding ideas: A basic encoder would just use a fixed block size.
* Block sizes can be multiples of 16, from 16 to 256. The blocks don't
* have to be quadratic. A brute force search with a set of different
#include <zlib.h>
#include "avcodec.h"
+#include "internal.h"
#include "put_bits.h"
#include "bytestream.h"
s->avctx = avctx;
if (avctx->width > 4095 || avctx->height > 4095) {
- av_log(avctx, AV_LOG_ERROR, "Input dimensions too large, input must be max 4096x4096 !\n");
+ av_log(avctx, AV_LOG_ERROR,
+ "Input dimensions too large, input must be max 4096x4096 !\n");
return AVERROR_INVALIDDATA;
}
/* loop over all block columns */
for (j = 0; j < v_blocks + (v_part ? 1 : 0); j++) {
- int hp = j * block_height; // horizontal position in frame
- int hs = (j < v_blocks) ? block_height : v_part; // size of block
+ int y_pos = j * block_height; // vertical position in frame
+ int cur_blk_height = (j < v_blocks) ? block_height : v_part;
/* loop over all block rows */
for (i = 0; i < h_blocks + (h_part ? 1 : 0); i++) {
- int wp = i * block_width; // vertical position in frame
- int ws = (i < h_blocks) ? block_width : h_part; // size of block
+ int x_pos = i * block_width; // horizontal position in frame
+ int cur_blk_width = (i < h_blocks) ? block_width : h_part;
int ret = Z_OK;
- uint8_t *ptr;
-
- ptr = buf + buf_pos;
+ uint8_t *ptr = buf + buf_pos;
/* copy the block to the temp buffer before compression
* (if it differs from the previous frame's block) */
res = copy_region_enc(p->data[0], s->tmpblock,
- s->image_height - (hp + hs + 1),
- wp, hs, ws, p->linesize[0], previous_frame);
+ s->image_height - (y_pos + cur_blk_height + 1),
+ x_pos, cur_blk_height, cur_blk_width,
+ p->linesize[0], previous_frame);
if (res || *I_frame) {
- unsigned long zsize;
- zsize = 3 * block_width * block_height;
- ret = compress2(ptr + 2, &zsize, s->tmpblock, 3 * ws * hs, 9);
-
+ unsigned long zsize = 3 * block_width * block_height;
+ ret = compress2(ptr + 2, &zsize, s->tmpblock,
+ 3 * cur_blk_width * cur_blk_height, 9);
//ret = deflateReset(&s->zstream);
if (ret != Z_OK)
- av_log(s->avctx, AV_LOG_ERROR, "error while compressing block %dx%d\n", i, j);
+ av_log(s->avctx, AV_LOG_ERROR,
+ "error while compressing block %dx%d\n", i, j);
- bytestream_put_be16(&ptr, (unsigned int) zsize);
+ bytestream_put_be16(&ptr, zsize);
buf_pos += zsize + 2;
- //av_log(avctx, AV_LOG_ERROR, "buf_pos = %d\n", buf_pos);
+ av_dlog(s->avctx, "buf_pos = %d\n", buf_pos);
} else {
pred_blocks++;
bytestream_put_be16(&ptr, 0);
}
-static int flashsv_encode_frame(AVCodecContext *avctx, uint8_t *buf,
- int buf_size, void *data)
+static int flashsv_encode_frame(AVCodecContext *avctx, AVPacket *pkt,
+ const AVFrame *pict, int *got_packet)
{
FlashSVContext * const s = avctx->priv_data;
- AVFrame *pict = data;
AVFrame * const p = &s->frame;
uint8_t *pfptr;
int res;
int I_frame = 0;
- int opt_w, opt_h;
+ int opt_w = 4, opt_h = 4;
*p = *pict;
pfptr = s->previous_frame;
/* Check the placement of keyframes */
- if (avctx->gop_size > 0) {
- if (avctx->frame_number >= s->last_key_frame + avctx->gop_size) {
- I_frame = 1;
- }
+ if (avctx->gop_size > 0 &&
+ avctx->frame_number >= s->last_key_frame + avctx->gop_size) {
+ I_frame = 1;
}
- opt_w = 4;
- opt_h = 4;
-
- if (buf_size < s->image_width*s->image_height*3) {
+ if ((res = ff_alloc_packet(pkt, s->image_width * s->image_height * 3)) < 0) {
//Conservative upper bound check for compressed data
- av_log(avctx, AV_LOG_ERROR, "buf_size %d < %d\n",
- buf_size, s->image_width * s->image_height * 3);
- return -1;
+ av_log(avctx, AV_LOG_ERROR, "Error getting output packet of size %d.\n",
+ s->image_width * s->image_height * 3);
+ return res;
}
- res = encode_bitstream(s, p, buf, buf_size, opt_w * 16, opt_h * 16, pfptr, &I_frame);
+ pkt->size = encode_bitstream(s, p, pkt->data, pkt->size, opt_w * 16, opt_h * 16,
+ pfptr, &I_frame);
//save the current frame
if (p->linesize[0] > 0)
memcpy(s->previous_frame, p->data[0], s->image_height * p->linesize[0]);
else
- memcpy(s->previous_frame, p->data[0] + p->linesize[0] * (s->image_height - 1),
+ memcpy(s->previous_frame,
+ p->data[0] + p->linesize[0] * (s->image_height - 1),
s->image_height * FFABS(p->linesize[0]));
//mark the frame type so the muxer can mux it correctly
if (I_frame) {
- p->pict_type = AV_PICTURE_TYPE_I;
- p->key_frame = 1;
+ p->pict_type = AV_PICTURE_TYPE_I;
+ p->key_frame = 1;
s->last_key_frame = avctx->frame_number;
- av_log(avctx, AV_LOG_DEBUG, "Inserting key frame at frame %d\n", avctx->frame_number);
+ av_dlog(avctx, "Inserting keyframe at frame %d\n", avctx->frame_number);
} else {
p->pict_type = AV_PICTURE_TYPE_P;
p->key_frame = 0;
avctx->coded_frame = p;
- return res;
+ if (p->key_frame)
+ pkt->flags |= AV_PKT_FLAG_KEY;
+ *got_packet = 1;
+
+ return 0;
}
static av_cold int flashsv_encode_end(AVCodecContext *avctx)
AVCodec ff_flashsv_encoder = {
.name = "flashsv",
.type = AVMEDIA_TYPE_VIDEO,
- .id = CODEC_ID_FLASHSV,
+ .id = AV_CODEC_ID_FLASHSV,
.priv_data_size = sizeof(FlashSVContext),
.init = flashsv_encode_init,
- .encode = flashsv_encode_frame,
+ .encode2 = flashsv_encode_frame,
.close = flashsv_encode_end,
- .pix_fmts = (const enum PixelFormat[]){PIX_FMT_BGR24, PIX_FMT_NONE},
+ .pix_fmts = (const enum AVPixelFormat[]){ AV_PIX_FMT_BGR24, AV_PIX_FMT_NONE },
.long_name = NULL_IF_CONFIG_SMALL("Flash Screen Video"),
};
-
projects / ffmpeg / blobdiff