mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-12-23 12:43:46 +02:00
change gif demuxer to gif decoder
Originally committed as revision 6760 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Baptiste Coudurier
parent
b92f5a6b31
commit
06d392a7cc
@ -64,6 +64,7 @@ version <next>
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- Tiertex .seq demuxer/video decoder
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- MTV demuxer
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- TIFF picture decoder
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- GIF picture decoder
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version 0.4.9-pre1:
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@ -121,6 +121,7 @@ Codecs:
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flashsv.c Benjamin Larsson
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flicvideo.c Mike Melanson
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g726.c Roman Shaposhnik
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gifdec.c Baptiste Coudurier
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h264* Loren Merritt, Michael Niedermayer
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h261* Michael Niedermayer
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h263* Michael Niedermayer
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@ -84,6 +84,7 @@ OBJS-$(CONFIG_FLASHSV_DECODER) += flashsv.o
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OBJS-$(CONFIG_FLIC_DECODER) += flicvideo.o
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OBJS-$(CONFIG_FOURXM_DECODER) += 4xm.o
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OBJS-$(CONFIG_FRAPS_DECODER) += fraps.o
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OBJS-$(CONFIG_GIF_DECODER) += gifdec.o
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OBJS-$(CONFIG_H261_DECODER) += h261.o
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OBJS-$(CONFIG_H261_ENCODER) += h261.o
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OBJS-$(CONFIG_H264_DECODER) += h264.o
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@ -193,6 +193,9 @@ void avcodec_register_all(void)
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#endif //CONFIG_RAWVIDEO_ENCODER
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/* decoders */
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#ifdef CONFIG_GIF_DECODER
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register_avcodec(&gif_decoder);
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#endif
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#ifdef CONFIG_H263_DECODER
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register_avcodec(&h263_decoder);
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#endif //CONFIG_H263_DECODER
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@ -37,8 +37,8 @@ extern "C" {
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#define AV_STRINGIFY(s) AV_TOSTRING(s)
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#define AV_TOSTRING(s) #s
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#define LIBAVCODEC_VERSION_INT ((51<<16)+(20<<8)+0)
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#define LIBAVCODEC_VERSION 51.20.0
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#define LIBAVCODEC_VERSION_INT ((51<<16)+(21<<8)+0)
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#define LIBAVCODEC_VERSION 51.21.0
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#define LIBAVCODEC_BUILD LIBAVCODEC_VERSION_INT
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#define LIBAVCODEC_IDENT "Lavc" AV_STRINGIFY(LIBAVCODEC_VERSION)
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@ -148,6 +148,7 @@ enum CodecID {
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CODEC_ID_DSICINVIDEO,
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CODEC_ID_TIERTEXSEQVIDEO,
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CODEC_ID_TIFF,
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CODEC_ID_GIF,
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/* various pcm "codecs" */
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CODEC_ID_PCM_S16LE= 0x10000,
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@ -2177,6 +2178,7 @@ extern AVCodec sonic_ls_encoder;
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extern AVCodec svq1_encoder;
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extern AVCodec x264_encoder;
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extern AVCodec gif_decoder;
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extern AVCodec h263_decoder;
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extern AVCodec h261_decoder;
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extern AVCodec mpeg4_decoder;
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50
libavcodec/bytestream.h
Normal file
50
libavcodec/bytestream.h
Normal file
@ -0,0 +1,50 @@
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/*
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* Bytestream functions
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* copyright (c) 2006 Baptiste Coudurier <baptiste.coudurier@free.fr>
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef FFMPEG_BYTESTREAM_H
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#define FFMPEG_BYTESTREAM_H
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static always_inline unsigned int bytestream_get_le32(uint8_t **b)
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{
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(*b) += 4;
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return LE_32(*b - 4);
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}
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static always_inline unsigned int bytestream_get_le16(uint8_t **b)
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{
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(*b) += 2;
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return LE_16(*b - 2);
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}
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static always_inline unsigned int bytestream_get_byte(uint8_t **b)
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{
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(*b)++;
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return (*b)[-1];
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}
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static always_inline unsigned int bytestream_get_buffer(uint8_t **b, uint8_t *dst, unsigned int size)
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{
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memcpy(dst, *b, size);
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(*b) += size;
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return size;
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}
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#endif /* FFMPEG_BYTESTREAM_H */
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495
libavcodec/gifdec.c
Normal file
495
libavcodec/gifdec.c
Normal file
@ -0,0 +1,495 @@
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/*
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* GIF decoder
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* Copyright (c) 2003 Fabrice Bellard.
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* Copyright (c) 2006 Baptiste Coudurier.
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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//#define DEBUG
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#include "avcodec.h"
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#include "bytestream.h"
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#define MAXBITS 12
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#define SIZTABLE (1<<MAXBITS)
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#define GCE_DISPOSAL_NONE 0
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#define GCE_DISPOSAL_INPLACE 1
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#define GCE_DISPOSAL_BACKGROUND 2
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#define GCE_DISPOSAL_RESTORE 3
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typedef struct GifState {
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int screen_width;
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int screen_height;
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int bits_per_pixel;
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int background_color_index;
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int transparent_color_index;
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int color_resolution;
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uint8_t *image_buf;
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int image_linesize;
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uint32_t image_palette[256];
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int pix_fmt;
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/* after the frame is displayed, the disposal method is used */
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int gce_disposal;
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/* delay during which the frame is shown */
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int gce_delay;
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/* LZW compatible decoder */
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uint8_t *bytestream;
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int eob_reached;
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uint8_t *pbuf, *ebuf;
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int bbits;
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unsigned int bbuf;
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int cursize; /* The current code size */
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int curmask;
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int codesize;
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int clear_code;
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int end_code;
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int newcodes; /* First available code */
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int top_slot; /* Highest code for current size */
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int slot; /* Last read code */
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int fc, oc;
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uint8_t *sp;
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uint8_t stack[SIZTABLE];
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uint8_t suffix[SIZTABLE];
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uint16_t prefix[SIZTABLE];
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/* aux buffers */
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uint8_t global_palette[256 * 3];
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uint8_t local_palette[256 * 3];
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uint8_t buf[256];
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} GifState;
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static const uint8_t gif87a_sig[6] = "GIF87a";
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static const uint8_t gif89a_sig[6] = "GIF89a";
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static const uint16_t mask[17] =
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{
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0x0000, 0x0001, 0x0003, 0x0007,
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0x000F, 0x001F, 0x003F, 0x007F,
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0x00FF, 0x01FF, 0x03FF, 0x07FF,
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0x0FFF, 0x1FFF, 0x3FFF, 0x7FFF, 0xFFFF
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};
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static void GLZWDecodeInit(GifState * s, int csize)
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{
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/* read buffer */
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s->eob_reached = 0;
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s->pbuf = s->buf;
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s->ebuf = s->buf;
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s->bbuf = 0;
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s->bbits = 0;
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/* decoder */
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s->codesize = csize;
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s->cursize = s->codesize + 1;
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s->curmask = mask[s->cursize];
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s->top_slot = 1 << s->cursize;
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s->clear_code = 1 << s->codesize;
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s->end_code = s->clear_code + 1;
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s->slot = s->newcodes = s->clear_code + 2;
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s->oc = s->fc = 0;
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s->sp = s->stack;
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}
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/* XXX: optimize */
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static inline int GetCode(GifState * s)
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{
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int c, sizbuf;
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uint8_t *ptr;
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while (s->bbits < s->cursize) {
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ptr = s->pbuf;
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if (ptr >= s->ebuf) {
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if (!s->eob_reached) {
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sizbuf = bytestream_get_byte(&s->bytestream);
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s->ebuf = s->buf + sizbuf;
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s->pbuf = s->buf;
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if (sizbuf > 0) {
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bytestream_get_buffer(&s->bytestream, s->buf, sizbuf);
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} else {
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s->eob_reached = 1;
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}
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}
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ptr = s->pbuf;
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}
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s->bbuf |= ptr[0] << s->bbits;
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ptr++;
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s->pbuf = ptr;
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s->bbits += 8;
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}
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c = s->bbuf & s->curmask;
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s->bbuf >>= s->cursize;
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s->bbits -= s->cursize;
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return c;
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}
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/* NOTE: the algorithm here is inspired from the LZW GIF decoder
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written by Steven A. Bennett in 1987. */
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/* return the number of byte decoded */
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static int GLZWDecode(GifState * s, uint8_t * buf, int len)
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{
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int l, c, code, oc, fc;
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uint8_t *sp;
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if (s->end_code < 0)
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return 0;
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l = len;
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sp = s->sp;
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oc = s->oc;
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fc = s->fc;
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while (sp > s->stack) {
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*buf++ = *(--sp);
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if ((--l) == 0)
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goto the_end;
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}
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for (;;) {
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c = GetCode(s);
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if (c == s->end_code) {
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s->end_code = -1;
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break;
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} else if (c == s->clear_code) {
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s->cursize = s->codesize + 1;
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s->curmask = mask[s->cursize];
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s->slot = s->newcodes;
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s->top_slot = 1 << s->cursize;
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while ((c = GetCode(s)) == s->clear_code);
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if (c == s->end_code) {
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s->end_code = -1;
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break;
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}
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/* test error */
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if (c >= s->slot)
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c = 0;
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fc = oc = c;
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*buf++ = c;
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if ((--l) == 0)
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break;
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} else {
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code = c;
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if (code >= s->slot) {
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*sp++ = fc;
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code = oc;
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}
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while (code >= s->newcodes) {
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*sp++ = s->suffix[code];
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code = s->prefix[code];
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}
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*sp++ = code;
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if (s->slot < s->top_slot) {
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s->suffix[s->slot] = fc = code;
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s->prefix[s->slot++] = oc;
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oc = c;
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}
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if (s->slot >= s->top_slot) {
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if (s->cursize < MAXBITS) {
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s->top_slot <<= 1;
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s->curmask = mask[++s->cursize];
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}
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}
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while (sp > s->stack) {
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*buf++ = *(--sp);
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if ((--l) == 0)
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goto the_end;
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}
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}
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}
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the_end:
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s->sp = sp;
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s->oc = oc;
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s->fc = fc;
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return len - l;
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}
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static int gif_read_image(GifState *s)
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{
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int left, top, width, height, bits_per_pixel, code_size, flags;
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int is_interleaved, has_local_palette, y, x, pass, y1, linesize, n, i;
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uint8_t *ptr, *line, *d, *spal, *palette, *sptr, *ptr1;
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left = bytestream_get_le16(&s->bytestream);
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top = bytestream_get_le16(&s->bytestream);
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width = bytestream_get_le16(&s->bytestream);
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height = bytestream_get_le16(&s->bytestream);
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flags = bytestream_get_byte(&s->bytestream);
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is_interleaved = flags & 0x40;
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has_local_palette = flags & 0x80;
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bits_per_pixel = (flags & 0x07) + 1;
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#ifdef DEBUG
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printf("gif: image x=%d y=%d w=%d h=%d\n", left, top, width, height);
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#endif
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if (has_local_palette) {
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bytestream_get_buffer(&s->bytestream, s->local_palette, 3 * (1 << bits_per_pixel));
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palette = s->local_palette;
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} else {
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palette = s->global_palette;
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bits_per_pixel = s->bits_per_pixel;
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}
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/* verify that all the image is inside the screen dimensions */
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if (left + width > s->screen_width ||
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top + height > s->screen_height)
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return -EINVAL;
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/* build the palette */
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n = (1 << bits_per_pixel);
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spal = palette;
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for(i = 0; i < n; i++) {
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s->image_palette[i] = (0xff << 24) |
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(spal[0] << 16) | (spal[1] << 8) | (spal[2]);
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spal += 3;
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}
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for(; i < 256; i++)
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s->image_palette[i] = (0xff << 24);
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/* handle transparency */
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if (s->transparent_color_index >= 0)
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s->image_palette[s->transparent_color_index] = 0;
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line = NULL;
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/* now get the image data */
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code_size = bytestream_get_byte(&s->bytestream);
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GLZWDecodeInit(s, code_size);
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/* read all the image */
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linesize = s->image_linesize;
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ptr1 = s->image_buf + top * linesize + (left * 3);
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ptr = ptr1;
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pass = 0;
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y1 = 0;
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for (y = 0; y < height; y++) {
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GLZWDecode(s, ptr, width);
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if (is_interleaved) {
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switch(pass) {
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default:
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case 0:
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case 1:
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y1 += 8;
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ptr += linesize * 8;
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if (y1 >= height) {
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y1 = 4;
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if (pass == 0)
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ptr = ptr1 + linesize * 4;
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else
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ptr = ptr1 + linesize * 2;
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pass++;
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}
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break;
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case 2:
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y1 += 4;
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ptr += linesize * 4;
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if (y1 >= height) {
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y1 = 1;
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ptr = ptr1 + linesize;
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pass++;
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}
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break;
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case 3:
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y1 += 2;
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ptr += linesize * 2;
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break;
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}
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} else {
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ptr += linesize;
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}
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}
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av_free(line);
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/* read the garbage data until end marker is found */
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while (!s->eob_reached)
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GetCode(s);
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return 0;
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}
|
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|
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static int gif_read_extension(GifState *s)
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{
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int ext_code, ext_len, i, gce_flags, gce_transparent_index;
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|
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/* extension */
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ext_code = bytestream_get_byte(&s->bytestream);
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ext_len = bytestream_get_byte(&s->bytestream);
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#ifdef DEBUG
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printf("gif: ext_code=0x%x len=%d\n", ext_code, ext_len);
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#endif
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switch(ext_code) {
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case 0xf9:
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if (ext_len != 4)
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goto discard_ext;
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s->transparent_color_index = -1;
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gce_flags = bytestream_get_byte(&s->bytestream);
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s->gce_delay = bytestream_get_le16(&s->bytestream);
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gce_transparent_index = bytestream_get_byte(&s->bytestream);
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if (gce_flags & 0x01)
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s->transparent_color_index = gce_transparent_index;
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else
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s->transparent_color_index = -1;
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s->gce_disposal = (gce_flags >> 2) & 0x7;
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#ifdef DEBUG
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printf("gif: gce_flags=%x delay=%d tcolor=%d disposal=%d\n",
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gce_flags, s->gce_delay,
|
||||
s->transparent_color_index, s->gce_disposal);
|
||||
#endif
|
||||
ext_len = bytestream_get_byte(&s->bytestream);
|
||||
break;
|
||||
}
|
||||
|
||||
/* NOTE: many extension blocks can come after */
|
||||
discard_ext:
|
||||
while (ext_len != 0) {
|
||||
for (i = 0; i < ext_len; i++)
|
||||
bytestream_get_byte(&s->bytestream);
|
||||
ext_len = bytestream_get_byte(&s->bytestream);
|
||||
#ifdef DEBUG
|
||||
printf("gif: ext_len1=%d\n", ext_len);
|
||||
#endif
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int gif_read_header1(GifState *s)
|
||||
{
|
||||
uint8_t sig[6];
|
||||
int ret, v, n;
|
||||
int has_global_palette;
|
||||
|
||||
/* read gif signature */
|
||||
bytestream_get_buffer(&s->bytestream, sig, 6);
|
||||
if (memcmp(sig, gif87a_sig, 6) != 0 &&
|
||||
memcmp(sig, gif89a_sig, 6) != 0)
|
||||
return -1;
|
||||
|
||||
/* read screen header */
|
||||
s->transparent_color_index = -1;
|
||||
s->screen_width = bytestream_get_le16(&s->bytestream);
|
||||
s->screen_height = bytestream_get_le16(&s->bytestream);
|
||||
if( (unsigned)s->screen_width > 32767
|
||||
|| (unsigned)s->screen_height > 32767){
|
||||
av_log(NULL, AV_LOG_ERROR, "picture size too large\n");
|
||||
return -1;
|
||||
}
|
||||
|
||||
v = bytestream_get_byte(&s->bytestream);
|
||||
s->color_resolution = ((v & 0x70) >> 4) + 1;
|
||||
has_global_palette = (v & 0x80);
|
||||
s->bits_per_pixel = (v & 0x07) + 1;
|
||||
s->background_color_index = bytestream_get_byte(&s->bytestream);
|
||||
bytestream_get_byte(&s->bytestream); /* ignored */
|
||||
#ifdef DEBUG
|
||||
printf("gif: screen_w=%d screen_h=%d bpp=%d global_palette=%d\n",
|
||||
s->screen_width, s->screen_height, s->bits_per_pixel,
|
||||
has_global_palette);
|
||||
#endif
|
||||
if (has_global_palette) {
|
||||
n = 1 << s->bits_per_pixel;
|
||||
bytestream_get_buffer(&s->bytestream, s->global_palette, n * 3);
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int gif_parse_next_image(GifState *s)
|
||||
{
|
||||
int ret, code;
|
||||
|
||||
for (;;) {
|
||||
code = bytestream_get_byte(&s->bytestream);
|
||||
#ifdef DEBUG
|
||||
printf("gif: code=%02x '%c'\n", code, code);
|
||||
#endif
|
||||
switch (code) {
|
||||
case ',':
|
||||
if (gif_read_image(s) < 0)
|
||||
return -1;
|
||||
ret = 0;
|
||||
goto the_end;
|
||||
case ';':
|
||||
/* end of image */
|
||||
ret = -1;
|
||||
goto the_end;
|
||||
case '!':
|
||||
if (gif_read_extension(s) < 0)
|
||||
return -1;
|
||||
break;
|
||||
case EOF:
|
||||
default:
|
||||
/* error or errneous EOF */
|
||||
ret = -1;
|
||||
goto the_end;
|
||||
}
|
||||
}
|
||||
the_end:
|
||||
return ret;
|
||||
}
|
||||
|
||||
static int gif_decode_init(AVCodecContext *avctx)
|
||||
{
|
||||
GifState *s = avctx->priv_data;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int gif_decode_frame(AVCodecContext *avctx, void *data, int *data_size, uint8_t *buf, int buf_size)
|
||||
{
|
||||
GifState *s = avctx->priv_data;
|
||||
AVFrame *picture = data;
|
||||
int ret;
|
||||
|
||||
s->bytestream = buf;
|
||||
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;
|
||||
s->pix_fmt = PIX_FMT_PAL8;
|
||||
/* now we are ready: build format streams */
|
||||
|
||||
/* XXX: check if screen size is always valid */
|
||||
avctx->width = s->screen_width;
|
||||
avctx->height = s->screen_height;
|
||||
avctx->pix_fmt = PIX_FMT_PAL8;
|
||||
|
||||
ret = gif_parse_next_image(s);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
|
||||
picture->data[0] = s->image_buf;
|
||||
picture->linesize[0] = s->image_linesize;
|
||||
picture->data[1] = s->image_palette;
|
||||
picture->linesize[1] = 4;
|
||||
|
||||
*data_size = sizeof(AVPicture);
|
||||
return 0;
|
||||
}
|
||||
|
||||
AVCodec gif_decoder = {
|
||||
"gif",
|
||||
CODEC_TYPE_VIDEO,
|
||||
CODEC_ID_GIF,
|
||||
sizeof(GifState),
|
||||
gif_decode_init,
|
||||
NULL,
|
||||
NULL,
|
||||
gif_decode_frame,
|
||||
};
|
||||
Loading…
Reference in New Issue
Block a user