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authorBaptiste Coudurier <baptiste.coudurier@gmail.com>2009-01-14 00:27:43 +0000
committerBaptiste Coudurier <baptiste.coudurier@gmail.com>2009-01-14 00:27:43 +0000
commit6d32ec6ce979f76906d983fa238c41e0bc6480f0 (patch)
tree363af421232584067f8e1ffcc050a4ca68ede420 /libavformat/gif.c
parentb63f641e9b2aeb0656288f8b16cea272ac890c22 (diff)
downloadffmpeg-6d32ec6ce979f76906d983fa238c41e0bc6480f0.tar.gz
cleanup gif, use BISTREAM_WRITER_LE
Originally committed as revision 16591 to svn://svn.ffmpeg.org/ffmpeg/trunk
Diffstat (limited to 'libavformat/gif.c')
-rw-r--r--libavformat/gif.c79
1 files changed, 9 insertions, 70 deletions
diff --git a/libavformat/gif.c b/libavformat/gif.c
index 0c6686fead..827570c7db 100644
--- a/libavformat/gif.c
+++ b/libavformat/gif.c
@@ -40,6 +40,11 @@
*/
#include "avformat.h"
+
+/* The GIF format uses reversed order for bitstreams... */
+/* at least they don't use PDP_ENDIAN :) */
+#define BITSTREAM_WRITER_LE
+
#include "libavcodec/bitstream.h"
/* bitstream minipacket size */
@@ -101,72 +106,6 @@ static const rgb_triplet gif_clut[216] = {
{ 0xff, 0xff, 0x00 }, { 0xff, 0xff, 0x33 }, { 0xff, 0xff, 0x66 }, { 0xff, 0xff, 0x99 }, { 0xff, 0xff, 0xcc }, { 0xff, 0xff, 0xff },
};
-/* The GIF format uses reversed order for bitstreams... */
-/* at least they don't use PDP_ENDIAN :) */
-/* so we 'extend' PutBitContext. hmmm, OOP :) */
-/* seems this thing changed slightly since I wrote it... */
-
-#ifdef ALT_BITSTREAM_WRITER
-# error no ALT_BITSTREAM_WRITER support for now
-#endif
-
-static void gif_put_bits_rev(PutBitContext *s, int n, unsigned int value)
-{
- unsigned int bit_buf;
- int bit_cnt;
-
- // printf("put_bits=%d %x\n", n, value);
- assert(n == 32 || value < (1U << n));
-
- bit_buf = s->bit_buf;
- bit_cnt = 32 - s->bit_left; /* XXX:lazyness... was = s->bit_cnt; */
-
- // printf("n=%d value=%x cnt=%d buf=%x\n", n, value, bit_cnt, bit_buf);
- /* XXX: optimize */
- if (n < (32-bit_cnt)) {
- bit_buf |= value << (bit_cnt);
- bit_cnt+=n;
- } else {
- bit_buf |= value << (bit_cnt);
-
- *s->buf_ptr = bit_buf & 0xff;
- s->buf_ptr[1] = (bit_buf >> 8) & 0xff;
- s->buf_ptr[2] = (bit_buf >> 16) & 0xff;
- s->buf_ptr[3] = (bit_buf >> 24) & 0xff;
-
- //printf("bitbuf = %08x\n", bit_buf);
- s->buf_ptr+=4;
- if (s->buf_ptr >= s->buf_end)
- abort();
-// flush_buffer_rev(s);
- bit_cnt=bit_cnt + n - 32;
- if (bit_cnt == 0) {
- bit_buf = 0;
- } else {
- bit_buf = value >> (n - bit_cnt);
- }
- }
-
- s->bit_buf = bit_buf;
- s->bit_left = 32 - bit_cnt;
-}
-
-/* pad the end of the output stream with zeros */
-static void gif_flush_put_bits_rev(PutBitContext *s)
-{
- while (s->bit_left < 32) {
- /* XXX: should test end of buffer */
- *s->buf_ptr++=s->bit_buf & 0xff;
- s->bit_buf>>=8;
- s->bit_left+=8;
- }
-// flush_buffer_rev(s);
- s->bit_left=32;
- s->bit_buf=0;
-}
-
-/* !RevPutBitContext */
-
/* GIF header */
static int gif_image_write_header(ByteIOContext *pb,
int width, int height, int loop_count,
@@ -272,7 +211,7 @@ static int gif_image_write_image(ByteIOContext *pb,
w = width;
while(left>0) {
- gif_put_bits_rev(&p, 9, 0x0100); /* clear code */
+ put_bits(&p, 9, 0x0100); /* clear code */
for(i=(left<GIF_CHUNKS)?left:GIF_CHUNKS;i;i--) {
if (pix_fmt == PIX_FMT_RGB24) {
@@ -281,7 +220,7 @@ static int gif_image_write_image(ByteIOContext *pb,
} else {
v = *ptr++;
}
- gif_put_bits_rev(&p, 9, v);
+ put_bits(&p, 9, v);
if (--w == 0) {
w = width;
buf += linesize;
@@ -290,8 +229,8 @@ static int gif_image_write_image(ByteIOContext *pb,
}
if(left<=GIF_CHUNKS) {
- gif_put_bits_rev(&p, 9, 0x101); /* end of stream */
- gif_flush_put_bits_rev(&p);
+ put_bits(&p, 9, 0x101); /* end of stream */
+ flush_put_bits(&p);
}
if(pbBufPtr(&p) - p.buf > 0) {
put_byte(pb, pbBufPtr(&p) - p.buf); /* byte count of the packet */