mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-12-23 12:43:46 +02:00
added primitive image GIF encoder based on animated gif encoder
Originally committed as revision 1540 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Fabrice Bellard
parent
fcfa89e81c
commit
ba19f84810
@ -166,9 +166,114 @@ static void gif_flush_put_bits_rev(PutBitContext *s)
|
||||
|
||||
/* !RevPutBitContext */
|
||||
|
||||
/* GIF header */
|
||||
static int gif_image_write_header(ByteIOContext *pb, int width, int height)
|
||||
{
|
||||
int i;
|
||||
|
||||
put_tag(pb, "GIF");
|
||||
put_tag(pb, "89a");
|
||||
put_le16(pb, width);
|
||||
put_le16(pb, height);
|
||||
|
||||
put_byte(pb, 0xf7); /* flags: global clut, 256 entries */
|
||||
put_byte(pb, 0x1f); /* background color index */
|
||||
put_byte(pb, 0); /* aspect ratio */
|
||||
|
||||
/* the global palette */
|
||||
|
||||
put_buffer(pb, (unsigned char *)gif_clut, 216*3);
|
||||
for(i=0;i<((256-216)*3);i++)
|
||||
put_byte(pb, 0);
|
||||
|
||||
/* application extension header */
|
||||
/* XXX: not really sure what to put in here... */
|
||||
#ifdef GIF_ADD_APP_HEADER
|
||||
put_byte(pb, 0x21);
|
||||
put_byte(pb, 0xff);
|
||||
put_byte(pb, 0x0b);
|
||||
put_tag(pb, "NETSCAPE2.0");
|
||||
put_byte(pb, 0x03);
|
||||
put_byte(pb, 0x01);
|
||||
put_byte(pb, 0x00);
|
||||
put_byte(pb, 0x00);
|
||||
#endif
|
||||
return 0;
|
||||
}
|
||||
|
||||
/* this is maybe slow, but allows for extensions */
|
||||
static inline unsigned char gif_clut_index(rgb_triplet *clut, UINT8 r, UINT8 g, UINT8 b)
|
||||
{
|
||||
return ((((r)/47)%6)*6*6+(((g)/47)%6)*6+(((b)/47)%6));
|
||||
}
|
||||
|
||||
|
||||
static int gif_image_write_image(ByteIOContext *pb,
|
||||
int x1, int y1, int width, int height,
|
||||
uint8_t *buf, int linesize)
|
||||
{
|
||||
PutBitContext p;
|
||||
UINT8 buffer[200]; /* 100 * 9 / 8 = 113 */
|
||||
int i, left, w;
|
||||
uint8_t *ptr;
|
||||
/* image block */
|
||||
|
||||
put_byte(pb, 0x2c);
|
||||
put_le16(pb, x1);
|
||||
put_le16(pb, y1);
|
||||
put_le16(pb, width);
|
||||
put_le16(pb, height);
|
||||
put_byte(pb, 0x00); /* flags */
|
||||
/* no local clut */
|
||||
|
||||
put_byte(pb, 0x08);
|
||||
|
||||
left= width * height;
|
||||
|
||||
init_put_bits(&p, buffer, 130, NULL, NULL);
|
||||
|
||||
/*
|
||||
* 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) {
|
||||
|
||||
gif_put_bits_rev(&p, 9, 0x0100); /* clear code */
|
||||
|
||||
for(i=0;i<GIF_CHUNKS;i++) {
|
||||
gif_put_bits_rev(&p, 9, gif_clut_index(NULL, ptr[0], ptr[1], ptr[2]));
|
||||
ptr+=3;
|
||||
if (--w == 0) {
|
||||
w = width;
|
||||
buf += linesize;
|
||||
ptr = buf;
|
||||
}
|
||||
}
|
||||
|
||||
if(left<=GIF_CHUNKS) {
|
||||
gif_put_bits_rev(&p, 9, 0x101); /* end of stream */
|
||||
gif_flush_put_bits_rev(&p);
|
||||
}
|
||||
if(pbBufPtr(&p) - p.buf > 0) {
|
||||
put_byte(pb, pbBufPtr(&p) - p.buf); /* byte count of the packet */
|
||||
put_buffer(pb, p.buf, pbBufPtr(&p) - p.buf); /* the actual buffer */
|
||||
p.data_out_size += pbBufPtr(&p) - p.buf;
|
||||
p.buf_ptr = p.buf; /* dequeue the bytes off the bitstream */
|
||||
}
|
||||
if(left<=GIF_CHUNKS) {
|
||||
put_byte(pb, 0x00); /* end of image block */
|
||||
}
|
||||
|
||||
left-=GIF_CHUNKS;
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
|
||||
typedef struct {
|
||||
UINT8 buffer[100]; /* data chunks */
|
||||
INT64 time, file_time;
|
||||
UINT8 buffer[100]; /* data chunks */
|
||||
} GIFContext;
|
||||
|
||||
static int gif_write_header(AVFormatContext *s)
|
||||
@ -204,46 +309,12 @@ static int gif_write_header(AVFormatContext *s)
|
||||
/* XXX: is it allowed ? seems to work so far... */
|
||||
video_enc->pix_fmt = PIX_FMT_RGB24;
|
||||
|
||||
/* GIF header */
|
||||
|
||||
put_tag(pb, "GIF");
|
||||
put_tag(pb, "89a");
|
||||
put_le16(pb, width);
|
||||
put_le16(pb, height);
|
||||
|
||||
put_byte(pb, 0xf7); /* flags: global clut, 256 entries */
|
||||
put_byte(pb, 0x1f); /* background color index */
|
||||
put_byte(pb, 0); /* aspect ratio */
|
||||
|
||||
/* the global palette */
|
||||
|
||||
put_buffer(pb, (unsigned char *)gif_clut, 216*3);
|
||||
for(i=0;i<((256-216)*3);i++)
|
||||
put_byte(pb, 0);
|
||||
|
||||
/* application extension header */
|
||||
/* XXX: not really sure what to put in here... */
|
||||
#ifdef GIF_ADD_APP_HEADER
|
||||
put_byte(pb, 0x21);
|
||||
put_byte(pb, 0xff);
|
||||
put_byte(pb, 0x0b);
|
||||
put_tag(pb, "NETSCAPE2.0");
|
||||
put_byte(pb, 0x03);
|
||||
put_byte(pb, 0x01);
|
||||
put_byte(pb, 0x00);
|
||||
put_byte(pb, 0x00);
|
||||
#endif
|
||||
gif_image_write_header(pb, width, height);
|
||||
|
||||
put_flush_packet(&s->pb);
|
||||
return 0;
|
||||
}
|
||||
|
||||
/* this is maybe slow, but allows for extensions */
|
||||
static inline unsigned char gif_clut_index(rgb_triplet *clut, UINT8 r, UINT8 g, UINT8 b)
|
||||
{
|
||||
return ((((r)/47)%6)*6*6+(((g)/47)%6)*6+(((b)/47)%6));
|
||||
}
|
||||
|
||||
/* chunk writer callback */
|
||||
/* !!! XXX:deprecated
|
||||
static void gif_put_chunk(void *pbctx, UINT8 *buffer, int count)
|
||||
@ -259,11 +330,8 @@ static int gif_write_video(AVFormatContext *s,
|
||||
{
|
||||
ByteIOContext *pb = &s->pb;
|
||||
GIFContext *gif = s->priv_data;
|
||||
int i, left, jiffies;
|
||||
int jiffies;
|
||||
INT64 delay;
|
||||
PutBitContext p;
|
||||
UINT8 buffer[200]; /* 100 * 9 / 8 = 113 */
|
||||
|
||||
|
||||
/* graphic control extension block */
|
||||
put_byte(pb, 0x21);
|
||||
@ -285,52 +353,8 @@ static int gif_write_video(AVFormatContext *s,
|
||||
put_byte(pb, 0x1f); /* transparent color index */
|
||||
put_byte(pb, 0x00);
|
||||
|
||||
/* image block */
|
||||
|
||||
put_byte(pb, 0x2c);
|
||||
put_le16(pb, 0);
|
||||
put_le16(pb, 0);
|
||||
put_le16(pb, enc->width);
|
||||
put_le16(pb, enc->height);
|
||||
put_byte(pb, 0x00); /* flags */
|
||||
/* no local clut */
|
||||
|
||||
put_byte(pb, 0x08);
|
||||
|
||||
left=size/3;
|
||||
|
||||
init_put_bits(&p, buffer, 130, NULL, NULL);
|
||||
|
||||
/*
|
||||
* 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 !)
|
||||
*/
|
||||
|
||||
while(left>0) {
|
||||
|
||||
gif_put_bits_rev(&p, 9, 0x0100); /* clear code */
|
||||
|
||||
for(i=0;i<GIF_CHUNKS;i++) {
|
||||
gif_put_bits_rev(&p, 9, gif_clut_index(NULL, *buf, buf[1], buf[2]));
|
||||
buf+=3;
|
||||
}
|
||||
|
||||
if(left<=GIF_CHUNKS) {
|
||||
gif_put_bits_rev(&p, 9, 0x101); /* end of stream */
|
||||
gif_flush_put_bits_rev(&p);
|
||||
}
|
||||
if(pbBufPtr(&p) - p.buf > 0) {
|
||||
put_byte(pb, pbBufPtr(&p) - p.buf); /* byte count of the packet */
|
||||
put_buffer(pb, p.buf, pbBufPtr(&p) - p.buf); /* the actual buffer */
|
||||
p.data_out_size += pbBufPtr(&p) - p.buf;
|
||||
p.buf_ptr = p.buf; /* dequeue the bytes off the bitstream */
|
||||
}
|
||||
if(left<=GIF_CHUNKS) {
|
||||
put_byte(pb, 0x00); /* end of image block */
|
||||
}
|
||||
|
||||
left-=GIF_CHUNKS;
|
||||
}
|
||||
gif_image_write_image(pb, 0, 0, enc->width, enc->height,
|
||||
buf, enc->width * 3);
|
||||
|
||||
put_flush_packet(&s->pb);
|
||||
return 0;
|
||||
@ -355,6 +379,17 @@ static int gif_write_trailer(AVFormatContext *s)
|
||||
return 0;
|
||||
}
|
||||
|
||||
/* better than nothing gif image writer */
|
||||
int gif_write(ByteIOContext *pb, AVImageInfo *info)
|
||||
{
|
||||
gif_image_write_header(pb, info->width, info->height);
|
||||
gif_image_write_image(pb, 0, 0, info->width, info->height,
|
||||
info->pict.data[0], info->pict.linesize[0]);
|
||||
put_byte(pb, 0x3b);
|
||||
put_flush_packet(pb);
|
||||
return 0;
|
||||
}
|
||||
|
||||
static AVOutputFormat gif_oformat = {
|
||||
"gif",
|
||||
"GIF Animation",
|
||||
@ -367,6 +402,7 @@ static AVOutputFormat gif_oformat = {
|
||||
gif_write_packet,
|
||||
gif_write_trailer,
|
||||
};
|
||||
|
||||
extern AVInputFormat gif_iformat;
|
||||
|
||||
int gif_init(void)
|
||||
|
||||
Loading…
Reference in New Issue
Block a user