* Copyright (C) 2004 Alex Beregszaszi
* Copyright (C) 2006 Benjamin Larsson
*
- * This file is part of FFmpeg.
+ * This file is part of Libav.
*
- * FFmpeg is free software; you can redistribute it and/or
+ * Libav 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,
+ * Libav 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
+ * License along with Libav; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/* Encoding development sponsored by http://fh-campuswien.ac.at */
/**
- * @file flashsvenc.c
+ * @file
* 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:
- * 4bits of block width
- * 12bits of frame width
- * 4bits of block height
- * 12bits of frame height
- *
- * Directly after the header are the compressed blocks. The blocks
- * have their compressed size represented with 16bits in the beginig.
- * 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 multipels of 16, from 16 to 256. The blocks don't
+/*
+ * 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
* block sizes should give a better result than to just use a fixed size.
- */
-
-/* TODO:
- * Don't reencode the frame in brute force mode if the frame is a dupe. Speed up.
- * Make the difference check faster.
+ *
+ * TODO:
+ * Don't reencode the frame in brute force mode if the frame is a dupe.
+ * Speed up. Make the difference check faster.
*/
#include <stdio.h>
#include <zlib.h>
#include "avcodec.h"
-#include "bitstream.h"
+#include "internal.h"
+#include "put_bits.h"
#include "bytestream.h"
typedef struct FlashSVContext {
AVCodecContext *avctx;
- uint8_t *previous_frame;
- AVFrame frame;
- int image_width, image_height;
- int block_width, block_height;
- uint8_t* tmpblock;
- uint8_t* encbuffer;
- int block_size;
- z_stream zstream;
- int last_key_frame;
+ uint8_t *previous_frame;
+ int image_width, image_height;
+ int block_width, block_height;
+ uint8_t *tmpblock;
+ uint8_t *encbuffer;
+ int block_size;
+ z_stream zstream;
+ int last_key_frame;
} FlashSVContext;
-static int copy_region_enc(uint8_t *sptr, uint8_t *dptr,
- int dx, int dy, int h, int w, int stride, uint8_t *pfptr) {
- int i,j;
+static int copy_region_enc(uint8_t *sptr, uint8_t *dptr, int dx, int dy,
+ int h, int w, int stride, uint8_t *pfptr)
+{
+ int i, j;
uint8_t *nsptr;
uint8_t *npfptr;
int diff = 0;
- for (i = dx+h; i > dx; i--) {
- nsptr = sptr+(i*stride)+dy*3;
- npfptr = pfptr+(i*stride)+dy*3;
- for (j=0 ; j<w*3 ; j++) {
- diff |=npfptr[j]^nsptr[j];
- dptr[j] = nsptr[j];
+ for (i = dx + h; i > dx; i--) {
+ nsptr = sptr + i * stride + dy * 3;
+ npfptr = pfptr + i * stride + dy * 3;
+ for (j = 0; j < w * 3; j++) {
+ diff |= npfptr[j] ^ nsptr[j];
+ dptr[j] = nsptr[j];
}
- dptr += w*3;
+ dptr += w * 3;
}
if (diff)
return 1;
return 0;
}
+static av_cold int flashsv_encode_end(AVCodecContext *avctx)
+{
+ FlashSVContext *s = avctx->priv_data;
+
+ deflateEnd(&s->zstream);
+
+ av_free(s->encbuffer);
+ av_free(s->previous_frame);
+ av_free(s->tmpblock);
+
+ return 0;
+}
+
static av_cold int flashsv_encode_init(AVCodecContext *avctx)
{
FlashSVContext *s = avctx->priv_data;
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");
- return -1;
- }
-
- if (avcodec_check_dimensions(avctx, avctx->width, avctx->height) < 0) {
- return -1;
+ if (avctx->width > 4095 || avctx->height > 4095) {
+ av_log(avctx, AV_LOG_ERROR,
+ "Input dimensions too large, input must be max 4096x4096 !\n");
+ return AVERROR_INVALIDDATA;
}
// Needed if zlib unused or init aborted before deflateInit
- memset(&(s->zstream), 0, sizeof(z_stream));
+ memset(&s->zstream, 0, sizeof(z_stream));
- s->last_key_frame=0;
+ s->last_key_frame = 0;
- s->image_width = avctx->width;
+ s->image_width = avctx->width;
s->image_height = avctx->height;
- s->tmpblock = av_mallocz(3*256*256);
- s->encbuffer = av_mallocz(s->image_width*s->image_height*3);
+ s->tmpblock = av_mallocz(3 * 256 * 256);
+ s->encbuffer = av_mallocz(s->image_width * s->image_height * 3);
if (!s->tmpblock || !s->encbuffer) {
av_log(avctx, AV_LOG_ERROR, "Memory allocation failed.\n");
- return -1;
+ return AVERROR(ENOMEM);
}
return 0;
}
-static int encode_bitstream(FlashSVContext *s, AVFrame *p, uint8_t *buf, int buf_size,
- int block_width, int block_height, uint8_t *previous_frame, int* I_frame) {
+static int encode_bitstream(FlashSVContext *s, const AVFrame *p, uint8_t *buf,
+ int buf_size, int block_width, int block_height,
+ uint8_t *previous_frame, int *I_frame)
+{
PutBitContext pb;
int h_blocks, v_blocks, h_part, v_part, i, j;
int buf_pos, res;
int pred_blocks = 0;
- init_put_bits(&pb, buf, buf_size*8);
+ init_put_bits(&pb, buf, buf_size * 8);
- put_bits(&pb, 4, (block_width/16)-1);
+ put_bits(&pb, 4, block_width / 16 - 1);
put_bits(&pb, 12, s->image_width);
- put_bits(&pb, 4, (block_height/16)-1);
+ put_bits(&pb, 4, block_height / 16 - 1);
put_bits(&pb, 12, s->image_height);
flush_put_bits(&pb);
- buf_pos=4;
+ buf_pos = 4;
- h_blocks = s->image_width / block_width;
- h_part = s->image_width % block_width;
+ h_blocks = s->image_width / block_width;
+ h_part = s->image_width % block_width;
v_blocks = s->image_height / block_height;
- v_part = s->image_height % block_height;
+ v_part = s->image_height % block_height;
/* loop over all block columns */
- for (j = 0; j < v_blocks + (v_part?1:0); j++)
- {
+ for (j = 0; j < v_blocks + (v_part ? 1 : 0); j++) {
- int hp = j*block_height; // horiz 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; // vert position in frame
- int ws = (i<h_blocks)?block_width:h_part; // size of block
- int ret=Z_OK;
- uint8_t *ptr;
-
- 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);
+ for (i = 0; i < h_blocks + (h_part ? 1 : 0); i++) {
+ 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 = 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 - (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));
+ //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);
- buf_pos += zsize+2;
- //av_log(avctx, AV_LOG_ERROR, "buf_pos = %d\n", buf_pos);
+ bytestream_put_be16(&ptr, zsize);
+ buf_pos += zsize + 2;
+ ff_dlog(s->avctx, "buf_pos = %d\n", buf_pos);
} else {
pred_blocks++;
- bytestream_put_be16(&ptr,0);
+ bytestream_put_be16(&ptr, 0);
buf_pos += 2;
}
}
}
-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;
+ const AVFrame * const p = pict;
uint8_t *pfptr;
int res;
int I_frame = 0;
- int opt_w, opt_h;
-
- *p = *pict;
+ int opt_w = 4, opt_h = 4;
/* First frame needs to be a keyframe */
if (avctx->frame_number == 0) {
- s->previous_frame = av_mallocz(FFABS(p->linesize[0])*s->image_height);
+ s->previous_frame = av_mallocz(FFABS(p->linesize[0]) * s->image_height);
if (!s->previous_frame) {
av_log(avctx, AV_LOG_ERROR, "Memory allocation failed.\n");
- return -1;
+ return AVERROR(ENOMEM);
}
I_frame = 1;
}
if (p->linesize[0] < 0)
- pfptr = s->previous_frame - ((s->image_height-1) * p->linesize[0]);
+ pfptr = s->previous_frame - (s->image_height - 1) * p->linesize[0];
else
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]);
+ 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), s->image_height*FFABS(p->linesize[0]));
+ 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 = FF_I_TYPE;
- p->key_frame = 1;
+#if FF_API_CODED_FRAME
+FF_DISABLE_DEPRECATION_WARNINGS
+ avctx->coded_frame->pict_type = AV_PICTURE_TYPE_I;
+ avctx->coded_frame->key_frame = 1;
+FF_ENABLE_DEPRECATION_WARNINGS
+#endif
s->last_key_frame = avctx->frame_number;
- av_log(avctx, AV_LOG_DEBUG, "Inserting key frame at frame %d\n",avctx->frame_number);
+ ff_dlog(avctx, "Inserting keyframe at frame %d\n", avctx->frame_number);
} else {
- p->pict_type = FF_P_TYPE;
- p->key_frame = 0;
+#if FF_API_CODED_FRAME
+FF_DISABLE_DEPRECATION_WARNINGS
+ avctx->coded_frame->pict_type = AV_PICTURE_TYPE_P;
+ avctx->coded_frame->key_frame = 0;
+FF_ENABLE_DEPRECATION_WARNINGS
+#endif
}
- avctx->coded_frame = p;
-
- return res;
-}
-
-static av_cold int flashsv_encode_end(AVCodecContext *avctx)
-{
- FlashSVContext *s = avctx->priv_data;
-
- deflateEnd(&(s->zstream));
-
- av_free(s->encbuffer);
- av_free(s->previous_frame);
- av_free(s->tmpblock);
+ if (I_frame)
+ pkt->flags |= AV_PKT_FLAG_KEY;
+ *got_packet = 1;
return 0;
}
-AVCodec flashsv_encoder = {
- "flashsv",
- CODEC_TYPE_VIDEO,
- CODEC_ID_FLASHSV,
- sizeof(FlashSVContext),
- flashsv_encode_init,
- flashsv_encode_frame,
- flashsv_encode_end,
- .pix_fmts = (enum PixelFormat[]){PIX_FMT_BGR24, -1},
+AVCodec ff_flashsv_encoder = {
+ .name = "flashsv",
+ .long_name = NULL_IF_CONFIG_SMALL("Flash Screen Video"),
+ .type = AVMEDIA_TYPE_VIDEO,
+ .id = AV_CODEC_ID_FLASHSV,
+ .priv_data_size = sizeof(FlashSVContext),
+ .init = flashsv_encode_init,
+ .encode2 = flashsv_encode_frame,
+ .close = flashsv_encode_end,
+ .pix_fmts = (const enum AVPixelFormat[]){ AV_PIX_FMT_BGR24, AV_PIX_FMT_NONE },
};
-
projects / ffmpeg / blobdiff