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cleanup gif, use BISTREAM_WRITER_LE

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Originally committed as revision 16591 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Baptiste Coudurier 2009-01-14 00:27:43 +00:00
parent b63f641e9b
commit 6d32ec6ce9
2 changed files with 18 additions and 136 deletions
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75
libavcodec/gif.c
View File

@ -43,6 +43,11 @@
#include "avcodec.h"
#include "bytestream.h"
/* The GIF format uses reversed order for bitstreams... */
/* at least they don't use PDP_ENDIAN :) */
#define BITSTREAM_WRITER_LE
#include "bitstream.h"
/* bitstream minipacket size */
@ -104,68 +109,6 @@ 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);
bytestream_put_le32(&s->buf_ptr, bit_buf);
//printf("bitbuf = %08x\n", bit_buf);
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(uint8_t **bytestream,
int width, int height, int loop_count,
@ -269,7 +212,7 @@ static int gif_image_write_image(uint8_t **bytestream,
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) {
@ -278,7 +221,7 @@ static int gif_image_write_image(uint8_t **bytestream,
} else {
v = *ptr++;
}
gif_put_bits_rev(&p, 9, v);
put_bits(&p, 9, v);
if (--w == 0) {
w = width;
buf += linesize;
@ -287,8 +230,8 @@ static int gif_image_write_image(uint8_t **bytestream,
}
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) {
bytestream_put_byte(bytestream, pbBufPtr(&p) - p.buf); /* byte count of the packet */

79
libavformat/gif.c
View File

@ -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 */