diff --git a/libavcodec/Makefile b/libavcodec/Makefile index 7939c42e9d..f96fa70cb6 100644 --- a/libavcodec/Makefile +++ b/libavcodec/Makefile @@ -82,6 +82,7 @@ OBJS-$(CONFIG_FLIC_DECODER) += flicvideo.o OBJS-$(CONFIG_FOURXM_DECODER) += 4xm.o OBJS-$(CONFIG_FRAPS_DECODER) += fraps.o OBJS-$(CONFIG_GIF_DECODER) += gifdec.o lzw.o +OBJS-$(CONFIG_GIF_ENCODER) += gif.o OBJS-$(CONFIG_H261_DECODER) += h261.o OBJS-$(CONFIG_H261_ENCODER) += h261.o OBJS-$(CONFIG_H264_DECODER) += h264.o diff --git a/libavcodec/allcodecs.c b/libavcodec/allcodecs.c index 39b670da10..cc0644e6df 100644 --- a/libavcodec/allcodecs.c +++ b/libavcodec/allcodecs.c @@ -68,6 +68,9 @@ void avcodec_register_all(void) #ifdef CONFIG_FLAC_ENCODER register_avcodec(&flac_encoder); #endif +#ifdef CONFIG_GIF_ENCODER + register_avcodec(&gif_encoder); +#endif #ifdef CONFIG_XVID #ifdef CONFIG_XVID_ENCODER register_avcodec(&xvid_encoder); diff --git a/libavcodec/avcodec.h b/libavcodec/avcodec.h index 5fa6d8a93d..7909946753 100644 --- a/libavcodec/avcodec.h +++ b/libavcodec/avcodec.h @@ -37,8 +37,8 @@ extern "C" { #define AV_STRINGIFY(s) AV_TOSTRING(s) #define AV_TOSTRING(s) #s -#define LIBAVCODEC_VERSION_INT ((51<<16)+(23<<8)+0) -#define LIBAVCODEC_VERSION 51.23.0 +#define LIBAVCODEC_VERSION_INT ((51<<16)+(24<<8)+0) +#define LIBAVCODEC_VERSION 51.24.0 #define LIBAVCODEC_BUILD LIBAVCODEC_VERSION_INT #define LIBAVCODEC_IDENT "Lavc" AV_STRINGIFY(LIBAVCODEC_VERSION) @@ -2138,6 +2138,7 @@ extern AVCodec mp3lame_encoder; extern AVCodec oggvorbis_encoder; extern AVCodec faac_encoder; extern AVCodec flac_encoder; +extern AVCodec gif_encoder; extern AVCodec xvid_encoder; extern AVCodec mpeg1video_encoder; extern AVCodec mpeg2video_encoder; diff --git a/libavcodec/bytestream.h b/libavcodec/bytestream.h index bd2ce1f6bd..c9d6130f1b 100644 --- a/libavcodec/bytestream.h +++ b/libavcodec/bytestream.h @@ -47,4 +47,29 @@ static always_inline unsigned int bytestream_get_buffer(uint8_t **b, uint8_t *ds return size; } +static always_inline void bytestream_put_le32(uint8_t **b, const unsigned int value) +{ + *(*b)++ = value; + *(*b)++ = value >> 8; + *(*b)++ = value >> 16; + *(*b)++ = value >> 24; +} + +static always_inline void bytestream_put_le16(uint8_t **b, const unsigned int value) +{ + *(*b)++ = value; + *(*b)++ = value >> 8; +} + +static always_inline void bytestream_put_byte(uint8_t **b, const unsigned int value) +{ + *(*b)++ = value; +} + +static always_inline void bytestream_put_buffer(uint8_t **b, const uint8_t *src, unsigned int size) +{ + memcpy(*b, src, size); + (*b) += size; +} + #endif /* FFMPEG_BYTESTREAM_H */ diff --git a/libavcodec/gif.c b/libavcodec/gif.c new file mode 100644 index 0000000000..f67ab52c22 --- /dev/null +++ b/libavcodec/gif.c @@ -0,0 +1,350 @@ +/* + * GIF encoder. + * Copyright (c) 2000 Fabrice Bellard. + * Copyright (c) 2002 Francois Revol. + * Copyright (c) 2006 Baptiste Coudurier. + * + * This file is part of FFmpeg. + * + * FFmpeg 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, + * 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 + * 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 + * - uses only a global standard palette + * - tested with IE 5.0, Opera for BeOS, NetPositive (BeOS), and Mozilla (BeOS). + * + * Reference documents: + * http://www.goice.co.jp/member/mo/formats/gif.html + * http://astronomy.swin.edu.au/pbourke/dataformats/gif/ + * http://www.dcs.ed.ac.uk/home/mxr/gfx/2d/GIF89a.txt + * + * this url claims to have an LZW algorithm not covered by Unisys patent: + * http://www.msg.net/utility/whirlgif/gifencod.html + * could help reduce the size of the files _a lot_... + * some sites mentions an RLE type compression also. + */ + +#include "avcodec.h" +#include "bytestream.h" +#include "bitstream.h" + +/* bitstream minipacket size */ +#define GIF_CHUNKS 100 + +/* slows down the decoding (and some browsers don't like it) */ +/* update on the 'some browsers don't like it issue from above: this was probably due to missing 'Data Sub-block Terminator' (byte 19) in the app_header */ +#define GIF_ADD_APP_HEADER // required to enable looping of animated gif + +typedef struct { + unsigned char r; + unsigned char g; + unsigned char b; +} rgb_triplet; + +/* we use the standard 216 color palette */ + +/* this script was used to create the palette: + * for r in 00 33 66 99 cc ff; do for g in 00 33 66 99 cc ff; do echo -n " "; for b in 00 33 66 99 cc ff; do + * echo -n "{ 0x$r, 0x$g, 0x$b }, "; done; echo ""; done; done + */ + +static const rgb_triplet gif_clut[216] = { + { 0x00, 0x00, 0x00 }, { 0x00, 0x00, 0x33 }, { 0x00, 0x00, 0x66 }, { 0x00, 0x00, 0x99 }, { 0x00, 0x00, 0xcc }, { 0x00, 0x00, 0xff }, + { 0x00, 0x33, 0x00 }, { 0x00, 0x33, 0x33 }, { 0x00, 0x33, 0x66 }, { 0x00, 0x33, 0x99 }, { 0x00, 0x33, 0xcc }, { 0x00, 0x33, 0xff }, + { 0x00, 0x66, 0x00 }, { 0x00, 0x66, 0x33 }, { 0x00, 0x66, 0x66 }, { 0x00, 0x66, 0x99 }, { 0x00, 0x66, 0xcc }, { 0x00, 0x66, 0xff }, + { 0x00, 0x99, 0x00 }, { 0x00, 0x99, 0x33 }, { 0x00, 0x99, 0x66 }, { 0x00, 0x99, 0x99 }, { 0x00, 0x99, 0xcc }, { 0x00, 0x99, 0xff }, + { 0x00, 0xcc, 0x00 }, { 0x00, 0xcc, 0x33 }, { 0x00, 0xcc, 0x66 }, { 0x00, 0xcc, 0x99 }, { 0x00, 0xcc, 0xcc }, { 0x00, 0xcc, 0xff }, + { 0x00, 0xff, 0x00 }, { 0x00, 0xff, 0x33 }, { 0x00, 0xff, 0x66 }, { 0x00, 0xff, 0x99 }, { 0x00, 0xff, 0xcc }, { 0x00, 0xff, 0xff }, + { 0x33, 0x00, 0x00 }, { 0x33, 0x00, 0x33 }, { 0x33, 0x00, 0x66 }, { 0x33, 0x00, 0x99 }, { 0x33, 0x00, 0xcc }, { 0x33, 0x00, 0xff }, + { 0x33, 0x33, 0x00 }, { 0x33, 0x33, 0x33 }, { 0x33, 0x33, 0x66 }, { 0x33, 0x33, 0x99 }, { 0x33, 0x33, 0xcc }, { 0x33, 0x33, 0xff }, + { 0x33, 0x66, 0x00 }, { 0x33, 0x66, 0x33 }, { 0x33, 0x66, 0x66 }, { 0x33, 0x66, 0x99 }, { 0x33, 0x66, 0xcc }, { 0x33, 0x66, 0xff }, + { 0x33, 0x99, 0x00 }, { 0x33, 0x99, 0x33 }, { 0x33, 0x99, 0x66 }, { 0x33, 0x99, 0x99 }, { 0x33, 0x99, 0xcc }, { 0x33, 0x99, 0xff }, + { 0x33, 0xcc, 0x00 }, { 0x33, 0xcc, 0x33 }, { 0x33, 0xcc, 0x66 }, { 0x33, 0xcc, 0x99 }, { 0x33, 0xcc, 0xcc }, { 0x33, 0xcc, 0xff }, + { 0x33, 0xff, 0x00 }, { 0x33, 0xff, 0x33 }, { 0x33, 0xff, 0x66 }, { 0x33, 0xff, 0x99 }, { 0x33, 0xff, 0xcc }, { 0x33, 0xff, 0xff }, + { 0x66, 0x00, 0x00 }, { 0x66, 0x00, 0x33 }, { 0x66, 0x00, 0x66 }, { 0x66, 0x00, 0x99 }, { 0x66, 0x00, 0xcc }, { 0x66, 0x00, 0xff }, + { 0x66, 0x33, 0x00 }, { 0x66, 0x33, 0x33 }, { 0x66, 0x33, 0x66 }, { 0x66, 0x33, 0x99 }, { 0x66, 0x33, 0xcc }, { 0x66, 0x33, 0xff }, + { 0x66, 0x66, 0x00 }, { 0x66, 0x66, 0x33 }, { 0x66, 0x66, 0x66 }, { 0x66, 0x66, 0x99 }, { 0x66, 0x66, 0xcc }, { 0x66, 0x66, 0xff }, + { 0x66, 0x99, 0x00 }, { 0x66, 0x99, 0x33 }, { 0x66, 0x99, 0x66 }, { 0x66, 0x99, 0x99 }, { 0x66, 0x99, 0xcc }, { 0x66, 0x99, 0xff }, + { 0x66, 0xcc, 0x00 }, { 0x66, 0xcc, 0x33 }, { 0x66, 0xcc, 0x66 }, { 0x66, 0xcc, 0x99 }, { 0x66, 0xcc, 0xcc }, { 0x66, 0xcc, 0xff }, + { 0x66, 0xff, 0x00 }, { 0x66, 0xff, 0x33 }, { 0x66, 0xff, 0x66 }, { 0x66, 0xff, 0x99 }, { 0x66, 0xff, 0xcc }, { 0x66, 0xff, 0xff }, + { 0x99, 0x00, 0x00 }, { 0x99, 0x00, 0x33 }, { 0x99, 0x00, 0x66 }, { 0x99, 0x00, 0x99 }, { 0x99, 0x00, 0xcc }, { 0x99, 0x00, 0xff }, + { 0x99, 0x33, 0x00 }, { 0x99, 0x33, 0x33 }, { 0x99, 0x33, 0x66 }, { 0x99, 0x33, 0x99 }, { 0x99, 0x33, 0xcc }, { 0x99, 0x33, 0xff }, + { 0x99, 0x66, 0x00 }, { 0x99, 0x66, 0x33 }, { 0x99, 0x66, 0x66 }, { 0x99, 0x66, 0x99 }, { 0x99, 0x66, 0xcc }, { 0x99, 0x66, 0xff }, + { 0x99, 0x99, 0x00 }, { 0x99, 0x99, 0x33 }, { 0x99, 0x99, 0x66 }, { 0x99, 0x99, 0x99 }, { 0x99, 0x99, 0xcc }, { 0x99, 0x99, 0xff }, + { 0x99, 0xcc, 0x00 }, { 0x99, 0xcc, 0x33 }, { 0x99, 0xcc, 0x66 }, { 0x99, 0xcc, 0x99 }, { 0x99, 0xcc, 0xcc }, { 0x99, 0xcc, 0xff }, + { 0x99, 0xff, 0x00 }, { 0x99, 0xff, 0x33 }, { 0x99, 0xff, 0x66 }, { 0x99, 0xff, 0x99 }, { 0x99, 0xff, 0xcc }, { 0x99, 0xff, 0xff }, + { 0xcc, 0x00, 0x00 }, { 0xcc, 0x00, 0x33 }, { 0xcc, 0x00, 0x66 }, { 0xcc, 0x00, 0x99 }, { 0xcc, 0x00, 0xcc }, { 0xcc, 0x00, 0xff }, + { 0xcc, 0x33, 0x00 }, { 0xcc, 0x33, 0x33 }, { 0xcc, 0x33, 0x66 }, { 0xcc, 0x33, 0x99 }, { 0xcc, 0x33, 0xcc }, { 0xcc, 0x33, 0xff }, + { 0xcc, 0x66, 0x00 }, { 0xcc, 0x66, 0x33 }, { 0xcc, 0x66, 0x66 }, { 0xcc, 0x66, 0x99 }, { 0xcc, 0x66, 0xcc }, { 0xcc, 0x66, 0xff }, + { 0xcc, 0x99, 0x00 }, { 0xcc, 0x99, 0x33 }, { 0xcc, 0x99, 0x66 }, { 0xcc, 0x99, 0x99 }, { 0xcc, 0x99, 0xcc }, { 0xcc, 0x99, 0xff }, + { 0xcc, 0xcc, 0x00 }, { 0xcc, 0xcc, 0x33 }, { 0xcc, 0xcc, 0x66 }, { 0xcc, 0xcc, 0x99 }, { 0xcc, 0xcc, 0xcc }, { 0xcc, 0xcc, 0xff }, + { 0xcc, 0xff, 0x00 }, { 0xcc, 0xff, 0x33 }, { 0xcc, 0xff, 0x66 }, { 0xcc, 0xff, 0x99 }, { 0xcc, 0xff, 0xcc }, { 0xcc, 0xff, 0xff }, + { 0xff, 0x00, 0x00 }, { 0xff, 0x00, 0x33 }, { 0xff, 0x00, 0x66 }, { 0xff, 0x00, 0x99 }, { 0xff, 0x00, 0xcc }, { 0xff, 0x00, 0xff }, + { 0xff, 0x33, 0x00 }, { 0xff, 0x33, 0x33 }, { 0xff, 0x33, 0x66 }, { 0xff, 0x33, 0x99 }, { 0xff, 0x33, 0xcc }, { 0xff, 0x33, 0xff }, + { 0xff, 0x66, 0x00 }, { 0xff, 0x66, 0x33 }, { 0xff, 0x66, 0x66 }, { 0xff, 0x66, 0x99 }, { 0xff, 0x66, 0xcc }, { 0xff, 0x66, 0xff }, + { 0xff, 0x99, 0x00 }, { 0xff, 0x99, 0x33 }, { 0xff, 0x99, 0x66 }, { 0xff, 0x99, 0x99 }, { 0xff, 0x99, 0xcc }, { 0xff, 0x99, 0xff }, + { 0xff, 0xcc, 0x00 }, { 0xff, 0xcc, 0x33 }, { 0xff, 0xcc, 0x66 }, { 0xff, 0xcc, 0x99 }, { 0xff, 0xcc, 0xcc }, { 0xff, 0xcc, 0xff }, + { 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) + puts("bit buffer overflow !!"); // should never happen ! who got rid of the callback ??? +// 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, + 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_byte(bytestream, 0xf7); /* flags: global clut, 256 entries */ + bytestream_put_byte(bytestream, 0x1f); /* background color index */ + bytestream_put_byte(bytestream, 0); /* aspect ratio */ + + /* the global palette */ + if (!palette) { + bytestream_put_buffer(bytestream, (const unsigned char *)gif_clut, 216*3); + for(i=0;i<((256-216)*3);i++) + bytestream_put_byte(bytestream, 0); + } else { + for(i=0;i<256;i++) { + v = palette[i]; + bytestream_put_byte(bytestream, (v >> 16) & 0xff); + bytestream_put_byte(bytestream, (v >> 8) & 0xff); + bytestream_put_byte(bytestream, (v) & 0xff); + } + } + + /* update: this is the 'NETSCAPE EXTENSION' that allows for looped animated gif + see http://members.aol.com/royalef/gifabout.htm#net-extension + + byte 1 : 33 (hex 0x21) GIF Extension code + byte 2 : 255 (hex 0xFF) Application Extension Label + byte 3 : 11 (hex (0x0B) Length of Application Block + (eleven bytes of data to follow) + bytes 4 to 11 : "NETSCAPE" + bytes 12 to 14 : "2.0" + byte 15 : 3 (hex 0x03) Length of Data Sub-Block + (three bytes of data to follow) + byte 16 : 1 (hex 0x01) + bytes 17 to 18 : 0 to 65535, an unsigned integer in + lo-hi byte format. This indicate the + number of iterations the loop should + be executed. + bytes 19 : 0 (hex 0x00) a Data Sub-block Terminator + */ + + /* application extension header */ +#ifdef GIF_ADD_APP_HEADER + if (loop_count >= 0 && loop_count <= 65535) { + bytestream_put_byte(bytestream, 0x21); + bytestream_put_byte(bytestream, 0xff); + bytestream_put_byte(bytestream, 0x0b); + bytestream_put_buffer(bytestream, "NETSCAPE2.0", 11); // bytes 4 to 14 + bytestream_put_byte(bytestream, 0x03); // byte 15 + bytestream_put_byte(bytestream, 0x01); // byte 16 + bytestream_put_le16(bytestream, (uint16_t)loop_count); + bytestream_put_byte(bytestream, 0x00); // byte 19 + } +#endif + return 0; +} + +/* this is maybe slow, but allows for extensions */ +static inline unsigned char gif_clut_index(uint8_t r, uint8_t g, uint8_t b) +{ + return ((((r)/47)%6)*6*6+(((g)/47)%6)*6+(((b)/47)%6)); +} + + +static int gif_image_write_image(uint8_t **bytestream, + int x1, int y1, int width, int height, + const uint8_t *buf, int linesize, int pix_fmt) +{ + PutBitContext p; + uint8_t buffer[200]; /* 100 * 9 / 8 = 113 */ + int i, left, w, v; + const uint8_t *ptr; + /* image block */ + + bytestream_put_byte(bytestream, 0x2c); + bytestream_put_le16(bytestream, x1); + bytestream_put_le16(bytestream, y1); + bytestream_put_le16(bytestream, width); + bytestream_put_le16(bytestream, height); + bytestream_put_byte(bytestream, 0x00); /* flags */ + /* no local clut */ + + bytestream_put_byte(bytestream, 0x08); + + left= width * height; + + init_put_bits(&p, buffer, 130); + +/* + * 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=(left 0) { + bytestream_put_byte(bytestream, pbBufPtr(&p) - p.buf); /* byte count of the packet */ + bytestream_put_buffer(bytestream, p.buf, pbBufPtr(&p) - p.buf); /* the actual buffer */ + p.buf_ptr = p.buf; /* dequeue the bytes off the bitstream */ + } + left-=GIF_CHUNKS; + } + bytestream_put_byte(bytestream, 0x00); /* end of image block */ + bytestream_put_byte(bytestream, 0x3b); + return 0; +} + +typedef struct { + int64_t time, file_time; + uint8_t buffer[100]; /* data chunks */ + AVFrame picture; +} GIFContext; + +static int gif_encode_init(AVCodecContext *avctx) +{ + GIFContext *s = avctx->priv_data; + + avctx->coded_frame = &s->picture; + return 0; +} + +/* better than nothing gif encoder */ +static int gif_encode_frame(AVCodecContext *avctx, unsigned char *outbuf, int buf_size, void *data) +{ + 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, -1, (uint32_t *)pict->data[1]); + gif_image_write_image(&outbuf_ptr, 0, 0, avctx->width, avctx->height, pict->data[0], pict->linesize[0], PIX_FMT_PAL8); + return outbuf_ptr - outbuf; +} + +AVCodec gif_encoder = { + "gif", + CODEC_TYPE_VIDEO, + CODEC_ID_GIF, + sizeof(GIFContext), + gif_encode_init, + gif_encode_frame, + NULL, //encode_end, + .pix_fmts= (enum PixelFormat[]){PIX_FMT_PAL8, -1}, +};