mirror of
https://gitee.com/openharmony/third_party_ffmpeg
synced 2024-11-23 19:30:05 +00:00
added automatic GIF/animated GIF probing - added GIF as an image format too - added interlaced gif support
Originally committed as revision 1539 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Fabrice Bellard
parent
b2609d4cbd
commit
fcfa89e81c
@ -18,6 +18,8 @@
|
||||
*/
|
||||
#include "avformat.h"
|
||||
|
||||
int gif_write(ByteIOContext *pb, AVImageInfo *info);
|
||||
|
||||
//#define DEBUG
|
||||
|
||||
#define MAXBITS 12
|
||||
@ -35,8 +37,8 @@ typedef struct GifState {
|
||||
int background_color_index;
|
||||
int transparent_color_index;
|
||||
int color_resolution;
|
||||
int image_count;
|
||||
uint8_t *image_buf;
|
||||
int image_linesize;
|
||||
/* after the frame is displayed, the disposal method is used */
|
||||
int gce_disposal;
|
||||
/* delay during which the frame is shown */
|
||||
@ -81,16 +83,60 @@ static const uint16_t mask[17] =
|
||||
0x0FFF, 0x1FFF, 0x3FFF, 0x7FFF, 0xFFFF
|
||||
};
|
||||
|
||||
static int gif_probe(AVProbeData * pd)
|
||||
/* Probe gif video format or gif image format. The current heuristic
|
||||
supposes the gif87a is always a single image. For gif89a, we
|
||||
consider it as a video only if a GCE extension is present in the
|
||||
first kilobyte. */
|
||||
static int gif_video_probe(AVProbeData * pd)
|
||||
{
|
||||
const uint8_t *p, *p_end;
|
||||
int bits_per_pixel, has_global_palette, ext_code, ext_len;
|
||||
|
||||
if (pd->buf_size < 24 ||
|
||||
memcmp(pd->buf, gif89a_sig, 6) != 0)
|
||||
return 0;
|
||||
p_end = pd->buf + pd->buf_size;
|
||||
p = pd->buf + 6;
|
||||
bits_per_pixel = (p[4] & 0x07) + 1;
|
||||
has_global_palette = (p[4] & 0x80);
|
||||
p += 7;
|
||||
if (has_global_palette)
|
||||
p += (1 << bits_per_pixel) * 3;
|
||||
for(;;) {
|
||||
if (p >= p_end)
|
||||
return 0;
|
||||
if (*p != '!')
|
||||
break;
|
||||
p++;
|
||||
if (p >= p_end)
|
||||
return 0;
|
||||
ext_code = *p++;
|
||||
/* if GCE extension found: it is likely to be an animation */
|
||||
if (ext_code == 0xf9)
|
||||
return AVPROBE_SCORE_MAX;
|
||||
for(;;) {
|
||||
if (p >= p_end)
|
||||
return 0;
|
||||
ext_len = *p++;
|
||||
if (ext_len == 0)
|
||||
break;
|
||||
p += ext_len;
|
||||
}
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int gif_image_probe(AVProbeData * pd)
|
||||
{
|
||||
if (pd->buf_size >= 24 &&
|
||||
(memcmp(pd->buf, gif87a_sig, 6) == 0 ||
|
||||
memcmp(pd->buf, gif89a_sig, 6) == 0))
|
||||
return AVPROBE_SCORE_MAX;
|
||||
return AVPROBE_SCORE_MAX - 1;
|
||||
else
|
||||
return 0;
|
||||
}
|
||||
|
||||
|
||||
static void GLZWDecodeInit(GifState * s, int csize)
|
||||
{
|
||||
/* read buffer */
|
||||
@ -224,13 +270,12 @@ static int GLZWDecode(GifState * s, uint8_t * buf, int len)
|
||||
return len - l;
|
||||
}
|
||||
|
||||
static int gif_read_image(AVFormatContext * s1, AVPacket * pkt)
|
||||
static int gif_read_image(GifState *s)
|
||||
{
|
||||
GifState *s = s1->priv_data;
|
||||
ByteIOContext *f = s->f;
|
||||
int left, top, width, height, bits_per_pixel, code_size, flags;
|
||||
int is_interleaved, has_local_palette, y, x, linesize;
|
||||
ByteIOContext *f = &s1->pb;
|
||||
uint8_t *ptr, *line, *d, *spal, *palette, *sptr;
|
||||
int is_interleaved, has_local_palette, y, x, pass, y1, linesize;
|
||||
uint8_t *ptr, *line, *d, *spal, *palette, *sptr, *ptr1;
|
||||
|
||||
left = get_le16(f);
|
||||
top = get_le16(f);
|
||||
@ -251,23 +296,10 @@ static int gif_read_image(AVFormatContext * s1, AVPacket * pkt)
|
||||
palette = s->global_palette;
|
||||
}
|
||||
|
||||
/* allocate local image (XXX: horrible, needs API change) */
|
||||
if (s->image_count == 0) {
|
||||
/* modify screen width/height if invalid */
|
||||
if (left + width > s->screen_width)
|
||||
s->screen_width = left + width;
|
||||
if (top + height > s->screen_height)
|
||||
s->screen_width = top + height;
|
||||
s->image_buf = av_malloc(s->screen_width * s->screen_height * 3);
|
||||
if (!s->image_buf)
|
||||
return -ENOMEM;
|
||||
} else {
|
||||
/* verify that all the image is inside the screen dimensions */
|
||||
if (left + width > s->screen_width ||
|
||||
top + height > s->screen_height)
|
||||
return -EINVAL;
|
||||
}
|
||||
s->image_count++;
|
||||
/* verify that all the image is inside the screen dimensions */
|
||||
if (left + width > s->screen_width ||
|
||||
top + height > s->screen_height)
|
||||
return -EINVAL;
|
||||
|
||||
line = av_malloc(width);
|
||||
if (!line)
|
||||
@ -279,8 +311,11 @@ static int gif_read_image(AVFormatContext * s1, AVPacket * pkt)
|
||||
GLZWDecodeInit(s, code_size);
|
||||
|
||||
/* read all the image and transcode it to RGB24 (horrible) */
|
||||
linesize = s->screen_width * 3;
|
||||
ptr = s->image_buf + top * linesize + (left * 3);
|
||||
linesize = s->image_linesize;
|
||||
ptr1 = s->image_buf + top * linesize + (left * 3);
|
||||
ptr = ptr1;
|
||||
pass = 0;
|
||||
y1 = 0;
|
||||
for (y = 0; y < height; y++) {
|
||||
GLZWDecode(s, line, width);
|
||||
d = ptr;
|
||||
@ -293,29 +328,51 @@ static int gif_read_image(AVFormatContext * s1, AVPacket * pkt)
|
||||
d += 3;
|
||||
sptr++;
|
||||
}
|
||||
ptr += linesize;
|
||||
if (is_interleaved) {
|
||||
switch(pass) {
|
||||
default:
|
||||
case 0:
|
||||
case 1:
|
||||
y1 += 8;
|
||||
ptr += linesize * 8;
|
||||
if (y1 >= height) {
|
||||
y1 = 4;
|
||||
if (pass == 0)
|
||||
ptr = ptr1 + linesize * 4;
|
||||
else
|
||||
ptr = ptr1 + linesize * 2;
|
||||
pass++;
|
||||
}
|
||||
break;
|
||||
case 2:
|
||||
y1 += 4;
|
||||
ptr += linesize * 4;
|
||||
if (y1 >= height) {
|
||||
y1 = 1;
|
||||
ptr = ptr1 + linesize;
|
||||
pass++;
|
||||
}
|
||||
break;
|
||||
case 3:
|
||||
y1 += 2;
|
||||
ptr += linesize * 2;
|
||||
break;
|
||||
}
|
||||
} else {
|
||||
ptr += linesize;
|
||||
}
|
||||
}
|
||||
av_free(line);
|
||||
|
||||
/* read the garbage data until end marker is found */
|
||||
while (!s->eob_reached)
|
||||
GetCode(s);
|
||||
|
||||
/* output image */
|
||||
/* XXX: avoid copying */
|
||||
if (av_new_packet(pkt, s->screen_width * s->screen_height * 3)) {
|
||||
av_free(line);
|
||||
return -EIO;
|
||||
}
|
||||
pkt->stream_index = 0;
|
||||
memcpy(pkt->data, s->image_buf, s->screen_width * s->screen_height * 3);
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int gif_read_extension(AVFormatContext * s1)
|
||||
static int gif_read_extension(GifState *s)
|
||||
{
|
||||
GifState *s = s1->priv_data;
|
||||
ByteIOContext *f = &s1->pb;
|
||||
ByteIOContext *f = s->f;
|
||||
int ext_code, ext_len, i, gce_flags, gce_transparent_index;
|
||||
|
||||
/* extension */
|
||||
@ -359,12 +416,9 @@ static int gif_read_extension(AVFormatContext * s1)
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int gif_read_header(AVFormatContext * s1,
|
||||
AVFormatParameters * ap)
|
||||
static int gif_read_header1(GifState *s)
|
||||
{
|
||||
GifState *s = s1->priv_data;
|
||||
ByteIOContext *f = &s1->pb;
|
||||
AVStream *st;
|
||||
ByteIOContext *f = s->f;
|
||||
uint8_t sig[6];
|
||||
int ret, v, n;
|
||||
int has_global_palette;
|
||||
@ -396,6 +450,60 @@ static int gif_read_header(AVFormatContext * s1,
|
||||
n = 1 << s->bits_per_pixel;
|
||||
get_buffer(f, s->global_palette, n * 3);
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int gif_parse_next_image(GifState *s)
|
||||
{
|
||||
ByteIOContext *f = s->f;
|
||||
int ret, code;
|
||||
|
||||
for (;;) {
|
||||
code = url_fgetc(f);
|
||||
#ifdef DEBUG
|
||||
printf("gif: code=%02x '%c'\n", code, code);
|
||||
#endif
|
||||
switch (code) {
|
||||
case ',':
|
||||
if (gif_read_image(s) < 0)
|
||||
return -EIO;
|
||||
ret = 0;
|
||||
goto the_end;
|
||||
case ';':
|
||||
/* end of image */
|
||||
ret = -EIO;
|
||||
goto the_end;
|
||||
case '!':
|
||||
if (gif_read_extension(s) < 0)
|
||||
return -EIO;
|
||||
break;
|
||||
case EOF:
|
||||
default:
|
||||
/* error or errneous EOF */
|
||||
ret = -EIO;
|
||||
goto the_end;
|
||||
}
|
||||
}
|
||||
the_end:
|
||||
return ret;
|
||||
}
|
||||
|
||||
static int gif_read_header(AVFormatContext * s1,
|
||||
AVFormatParameters * ap)
|
||||
{
|
||||
GifState *s = s1->priv_data;
|
||||
ByteIOContext *f = &s1->pb;
|
||||
AVStream *st;
|
||||
|
||||
s->f = f;
|
||||
if (gif_read_header1(s) < 0)
|
||||
return -1;
|
||||
|
||||
/* allocate image buffer */
|
||||
s->image_linesize = s->screen_width * 3;
|
||||
s->image_buf = av_malloc(s->screen_height * s->image_linesize);
|
||||
if (!s->image_buf)
|
||||
return -ENOMEM;
|
||||
/* now we are ready: build format streams */
|
||||
st = av_new_stream(s1, 0);
|
||||
if (!st)
|
||||
@ -414,37 +522,20 @@ static int gif_read_header(AVFormatContext * s1,
|
||||
static int gif_read_packet(AVFormatContext * s1,
|
||||
AVPacket * pkt)
|
||||
{
|
||||
ByteIOContext *f = &s1->pb;
|
||||
int ret, code;
|
||||
GifState *s = s1->priv_data;
|
||||
int ret;
|
||||
|
||||
for (;;) {
|
||||
code = url_fgetc(f);
|
||||
#ifdef DEBUG
|
||||
printf("gif: code=%02x '%c'\n", code, code);
|
||||
#endif
|
||||
switch (code) {
|
||||
case ',':
|
||||
if (gif_read_image(s1, pkt) < 0)
|
||||
return -EIO;
|
||||
ret = 0;
|
||||
goto the_end;
|
||||
case ';':
|
||||
/* end of image */
|
||||
ret = -EIO;
|
||||
goto the_end;
|
||||
case '!':
|
||||
if (gif_read_extension(s1) < 0)
|
||||
return -EIO;
|
||||
break;
|
||||
case EOF:
|
||||
default:
|
||||
/* error or errneous EOF */
|
||||
ret = -EIO;
|
||||
goto the_end;
|
||||
}
|
||||
ret = gif_parse_next_image(s);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
|
||||
/* XXX: avoid copying */
|
||||
if (av_new_packet(pkt, s->screen_width * s->screen_height * 3)) {
|
||||
return -EIO;
|
||||
}
|
||||
the_end:
|
||||
return ret;
|
||||
pkt->stream_index = 0;
|
||||
memcpy(pkt->data, s->image_buf, s->screen_width * s->screen_height * 3);
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int gif_read_close(AVFormatContext *s1)
|
||||
@ -454,13 +545,48 @@ static int gif_read_close(AVFormatContext *s1)
|
||||
return 0;
|
||||
}
|
||||
|
||||
/* read gif as image */
|
||||
static int gif_read(ByteIOContext *f,
|
||||
int (*alloc_cb)(void *opaque, AVImageInfo *info), void *opaque)
|
||||
{
|
||||
GifState s1, *s = &s1;
|
||||
AVImageInfo info1, *info = &info1;
|
||||
int ret;
|
||||
|
||||
memset(s, 0, sizeof(GifState));
|
||||
s->f = f;
|
||||
if (gif_read_header1(s) < 0)
|
||||
return -1;
|
||||
info->width = s->screen_width;
|
||||
info->height = s->screen_height;
|
||||
info->pix_fmt = PIX_FMT_RGB24;
|
||||
ret = alloc_cb(opaque, info);
|
||||
if (ret)
|
||||
return ret;
|
||||
s->image_buf = info->pict.data[0];
|
||||
s->image_linesize = info->pict.linesize[0];
|
||||
|
||||
if (gif_parse_next_image(s) < 0)
|
||||
return -1;
|
||||
return 0;
|
||||
}
|
||||
|
||||
AVInputFormat gif_iformat =
|
||||
{
|
||||
"gif",
|
||||
"gif format",
|
||||
sizeof(GifState),
|
||||
gif_probe,
|
||||
gif_video_probe,
|
||||
gif_read_header,
|
||||
gif_read_packet,
|
||||
gif_read_close,
|
||||
};
|
||||
|
||||
AVImageFormat gif_image_format = {
|
||||
"gif",
|
||||
"gif",
|
||||
gif_image_probe,
|
||||
gif_read,
|
||||
(1 << PIX_FMT_RGB24),
|
||||
gif_write,
|
||||
};
|
||||
|
||||
Loading…
Reference in New Issue
Block a user