* Copyright (c) 2002 Francois Revol
* Copyright (c) 2006 Baptiste Coudurier
*
- * This file is part of FFmpeg.
+ * first version by Francois Revol <revol@free.fr>
*
- * FFmpeg is free software; you can redistribute it and/or
+ * This file is part of Libav.
+ *
+ * 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
*/
/*
- * First version by Francois Revol revol@free.fr
- *
* Features and limitations:
* - currently no compression is performed,
* in fact the size of the data is 9/8 the size of the image in 8bpp
#include "avcodec.h"
#include "bytestream.h"
+#include "internal.h"
+#include "lzw.h"
/* The GIF format uses reversed order for bitstreams... */
/* at least they don't use PDP_ENDIAN :) */
#include "put_bits.h"
-/* bitstream minipacket size */
-#define GIF_CHUNKS 100
-
-typedef struct {
- AVFrame picture;
+typedef struct GIFContext {
+ LZWState *lzw;
+ uint8_t *buf;
} GIFContext;
/* GIF header */
-static int gif_image_write_header(uint8_t **bytestream,
- int width, int height,
- uint32_t *palette)
+static int gif_image_write_header(AVCodecContext *avctx,
+ uint8_t **bytestream, uint32_t *palette)
{
int i;
unsigned int v;
bytestream_put_buffer(bytestream, "GIF", 3);
bytestream_put_buffer(bytestream, "89a", 3);
- bytestream_put_le16(bytestream, width);
- bytestream_put_le16(bytestream, height);
+ bytestream_put_le16(bytestream, avctx->width);
+ bytestream_put_le16(bytestream, avctx->height);
bytestream_put_byte(bytestream, 0xf7); /* flags: global clut, 256 entries */
bytestream_put_byte(bytestream, 0x1f); /* background color index */
return 0;
}
-static int gif_image_write_image(uint8_t **bytestream,
- int width, int height,
- const uint8_t *buf, int linesize, int pix_fmt)
+static int gif_image_write_image(AVCodecContext *avctx,
+ uint8_t **bytestream, uint8_t *end,
+ const uint8_t *buf, int linesize)
{
- PutBitContext p;
- uint8_t buffer[200]; /* 100 * 9 / 8 = 113 */
- int i, left, w;
+ GIFContext *s = avctx->priv_data;
+ int len = 0, height;
const uint8_t *ptr;
/* image block */
bytestream_put_byte(bytestream, 0x2c);
bytestream_put_le16(bytestream, 0);
bytestream_put_le16(bytestream, 0);
- bytestream_put_le16(bytestream, width);
- bytestream_put_le16(bytestream, height);
+ bytestream_put_le16(bytestream, avctx->width);
+ bytestream_put_le16(bytestream, avctx->height);
bytestream_put_byte(bytestream, 0x00); /* flags */
/* no local clut */
bytestream_put_byte(bytestream, 0x08);
- left= width * height;
-
- init_put_bits(&p, buffer, 130);
+ ff_lzw_encode_init(s->lzw, s->buf, avctx->width*avctx->height,
+ 12, FF_LZW_GIF, put_bits);
-/*
- * the thing here is the bitstream is written as little packets, with a size byte before
- * but it's still the same bitstream between packets (no flush !)
- */
ptr = buf;
- w = width;
- while(left>0) {
-
- put_bits(&p, 9, 0x0100); /* clear code */
-
- for(i=(left<GIF_CHUNKS)?left:GIF_CHUNKS;i;i--) {
- put_bits(&p, 9, *ptr++);
- if (--w == 0) {
- w = width;
- buf += linesize;
- ptr = buf;
- }
- }
-
- if(left<=GIF_CHUNKS) {
- put_bits(&p, 9, 0x101); /* end of stream */
- flush_put_bits(&p);
- }
- if(put_bits_ptr(&p) - p.buf > 0) {
- bytestream_put_byte(bytestream, put_bits_ptr(&p) - p.buf); /* byte count of the packet */
- bytestream_put_buffer(bytestream, p.buf, put_bits_ptr(&p) - p.buf); /* the actual buffer */
- p.buf_ptr = p.buf; /* dequeue the bytes off the bitstream */
- }
- left-=GIF_CHUNKS;
+ for (height = avctx->height; height--;) {
+ len += ff_lzw_encode(s->lzw, ptr, avctx->width);
+ ptr += linesize;
+ }
+ len += ff_lzw_encode_flush(s->lzw, flush_put_bits);
+
+ ptr = s->buf;
+ while (len > 0) {
+ int size = FFMIN(255, len);
+ bytestream_put_byte(bytestream, size);
+ if (end - *bytestream < size)
+ return -1;
+ bytestream_put_buffer(bytestream, ptr, size);
+ ptr += size;
+ len -= size;
}
bytestream_put_byte(bytestream, 0x00); /* end of image block */
bytestream_put_byte(bytestream, 0x3b);
{
GIFContext *s = avctx->priv_data;
- avctx->coded_frame = &s->picture;
+#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->lzw = av_mallocz(ff_lzw_encode_state_size);
+ if (!s->lzw)
+ return AVERROR(ENOMEM);
+ s->buf = av_malloc(avctx->width*avctx->height*2);
+ if (!s->buf)
+ return AVERROR(ENOMEM);
return 0;
}
/* better than nothing gif encoder */
-static int gif_encode_frame(AVCodecContext *avctx, unsigned char *outbuf, int buf_size, void *data)
+static int gif_encode_frame(AVCodecContext *avctx, AVPacket *pkt,
+ const AVFrame *pict, int *got_packet)
+{
+ uint8_t *outbuf_ptr, *end;
+ int ret;
+
+ if ((ret = ff_alloc_packet(pkt, avctx->width*avctx->height*7/5 + FF_MIN_BUFFER_SIZE)) < 0) {
+ av_log(avctx, AV_LOG_ERROR, "Error getting output packet.\n");
+ return ret;
+ }
+ outbuf_ptr = pkt->data;
+ end = pkt->data + pkt->size;
+
+ gif_image_write_header(avctx, &outbuf_ptr, (uint32_t *)pict->data[1]);
+ gif_image_write_image(avctx, &outbuf_ptr, end, pict->data[0], pict->linesize[0]);
+
+ pkt->size = outbuf_ptr - pkt->data;
+ pkt->flags |= AV_PKT_FLAG_KEY;
+ *got_packet = 1;
+
+ return 0;
+}
+
+static int gif_encode_close(AVCodecContext *avctx)
{
GIFContext *s = avctx->priv_data;
- AVFrame *pict = data;
- AVFrame *const p = (AVFrame *)&s->picture;
- uint8_t *outbuf_ptr = outbuf;
-
- *p = *pict;
- p->pict_type = FF_I_TYPE;
- p->key_frame = 1;
- gif_image_write_header(&outbuf_ptr, avctx->width, avctx->height, (uint32_t *)pict->data[1]);
- gif_image_write_image(&outbuf_ptr, avctx->width, avctx->height, pict->data[0], pict->linesize[0], PIX_FMT_PAL8);
- return outbuf_ptr - outbuf;
+
+ av_freep(&s->lzw);
+ av_freep(&s->buf);
+ return 0;
}
-AVCodec gif_encoder = {
- "gif",
- CODEC_TYPE_VIDEO,
- CODEC_ID_GIF,
- sizeof(GIFContext),
- gif_encode_init,
- gif_encode_frame,
- NULL, //encode_end,
- .pix_fmts= (const enum PixelFormat[]){PIX_FMT_RGB8, PIX_FMT_BGR8, PIX_FMT_RGB4_BYTE, PIX_FMT_BGR4_BYTE, PIX_FMT_GRAY8, PIX_FMT_PAL8, PIX_FMT_NONE},
- .long_name= NULL_IF_CONFIG_SMALL("GIF (Graphics Interchange Format)"),
+AVCodec ff_gif_encoder = {
+ .name = "gif",
+ .long_name = NULL_IF_CONFIG_SMALL("GIF (Graphics Interchange Format)"),
+ .type = AVMEDIA_TYPE_VIDEO,
+ .id = AV_CODEC_ID_GIF,
+ .priv_data_size = sizeof(GIFContext),
+ .init = gif_encode_init,
+ .encode2 = gif_encode_frame,
+ .close = gif_encode_close,
+ .pix_fmts = (const enum AVPixelFormat[]){
+ AV_PIX_FMT_RGB8, AV_PIX_FMT_BGR8, AV_PIX_FMT_RGB4_BYTE, AV_PIX_FMT_BGR4_BYTE,
+ AV_PIX_FMT_GRAY8, AV_PIX_FMT_PAL8, AV_PIX_FMT_NONE
+ },
};
projects / ffmpeg / blobdiff