summaryrefslogtreecommitdiff
path: root/ffmpeg1/libavcodec/gif.c
diff options
context:
space:
mode:
Diffstat (limited to 'ffmpeg1/libavcodec/gif.c')
-rw-r--r--ffmpeg1/libavcodec/gif.c205
1 files changed, 0 insertions, 205 deletions
diff --git a/ffmpeg1/libavcodec/gif.c b/ffmpeg1/libavcodec/gif.c
deleted file mode 100644
index de3e576..0000000
--- a/ffmpeg1/libavcodec/gif.c
+++ /dev/null
@@ -1,205 +0,0 @@
-/*
- * 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:
- * - 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
- */
-
-#include "avcodec.h"
-#include "bytestream.h"
-#include "internal.h"
-#include "lzw.h"
-
-/* The GIF format uses reversed order for bitstreams... */
-/* at least they don't use PDP_ENDIAN :) */
-#define BITSTREAM_WRITER_LE
-
-#include "put_bits.h"
-
-typedef struct {
- AVFrame picture;
- LZWState *lzw;
- uint8_t *buf;
-} GIFContext;
-
-/* GIF header */
-static int gif_image_write_header(AVCodecContext *avctx,
- uint8_t **bytestream, uint32_t *palette)
-{
- int i;
- unsigned int v, smallest_alpha = 0xFF, alpha_component = 0;
-
- bytestream_put_buffer(bytestream, "GIF", 3);
- bytestream_put_buffer(bytestream, "89a", 3);
- bytestream_put_le16(bytestream, avctx->width);
- bytestream_put_le16(bytestream, avctx->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 */
- for(i=0;i<256;i++) {
- v = palette[i];
- bytestream_put_be24(bytestream, v);
- if (v >> 24 < smallest_alpha) {
- smallest_alpha = v >> 24;
- alpha_component = i;
- }
- }
-
- if (smallest_alpha < 128) {
- bytestream_put_byte(bytestream, 0x21); /* Extension Introducer */
- bytestream_put_byte(bytestream, 0xf9); /* Graphic Control Label */
- bytestream_put_byte(bytestream, 0x04); /* block length */
- bytestream_put_byte(bytestream, 0x01); /* Transparent Color Flag */
- bytestream_put_le16(bytestream, 0x00); /* no delay */
- bytestream_put_byte(bytestream, alpha_component);
- bytestream_put_byte(bytestream, 0x00);
- }
-
- return 0;
-}
-
-static int gif_image_write_image(AVCodecContext *avctx,
- uint8_t **bytestream, uint8_t *end,
- const uint8_t *buf, int linesize)
-{
- GIFContext *s = avctx->priv_data;
- int len = 0, height;
- const uint8_t *ptr;
- /* image block */
-
- bytestream_put_byte(bytestream, 0x2c);
- bytestream_put_le16(bytestream, 0);
- bytestream_put_le16(bytestream, 0);
- bytestream_put_le16(bytestream, avctx->width);
- bytestream_put_le16(bytestream, avctx->height);
- bytestream_put_byte(bytestream, 0x00); /* flags */
- /* no local clut */
-
- bytestream_put_byte(bytestream, 0x08);
-
- ff_lzw_encode_init(s->lzw, s->buf, avctx->width*avctx->height,
- 12, FF_LZW_GIF, put_bits);
-
- ptr = buf;
- for (height = avctx->height; height--;) {
- len += ff_lzw_encode(s->lzw, ptr, avctx->width);
- ptr += linesize;
- }
- len += ff_lzw_encode_flush(s->lzw, flush_put_bits);
-
- ptr = s->buf;
- while (len > 0) {
- int size = FFMIN(255, len);
- bytestream_put_byte(bytestream, size);
- if (end - *bytestream < size)
- return -1;
- bytestream_put_buffer(bytestream, ptr, size);
- ptr += size;
- len -= size;
- }
- bytestream_put_byte(bytestream, 0x00); /* end of image block */
- bytestream_put_byte(bytestream, 0x3b);
- return 0;
-}
-
-static av_cold int gif_encode_init(AVCodecContext *avctx)
-{
- GIFContext *s = avctx->priv_data;
-
- if (avctx->width > 65535 || avctx->height > 65535) {
- av_log(avctx, AV_LOG_ERROR, "GIF does not support resolutions above 65535x65535\n");
- return -1;
- }
-
- avctx->coded_frame = &s->picture;
- s->lzw = av_mallocz(ff_lzw_encode_state_size);
- if (!s->lzw)
- return AVERROR(ENOMEM);
- s->buf = av_malloc(avctx->width*avctx->height*2);
- if (!s->buf)
- return AVERROR(ENOMEM);
- return 0;
-}
-
-/* better than nothing gif encoder */
-static int gif_encode_frame(AVCodecContext *avctx, AVPacket *pkt,
- const AVFrame *pict, int *got_packet)
-{
- GIFContext *s = avctx->priv_data;
- AVFrame *const p = &s->picture;
- uint8_t *outbuf_ptr, *end;
- int ret;
-
- if ((ret = ff_alloc_packet2(avctx, pkt, avctx->width*avctx->height*7/5 + FF_MIN_BUFFER_SIZE)) < 0)
- return ret;
- outbuf_ptr = pkt->data;
- end = pkt->data + pkt->size;
-
- *p = *pict;
- p->pict_type = AV_PICTURE_TYPE_I;
- p->key_frame = 1;
- gif_image_write_header(avctx, &outbuf_ptr, (uint32_t *)pict->data[1]);
- gif_image_write_image(avctx, &outbuf_ptr, end, pict->data[0], pict->linesize[0]);
-
- pkt->size = outbuf_ptr - pkt->data;
- pkt->flags |= AV_PKT_FLAG_KEY;
- *got_packet = 1;
-
- return 0;
-}
-
-static int gif_encode_close(AVCodecContext *avctx)
-{
- GIFContext *s = avctx->priv_data;
-
- av_freep(&s->lzw);
- av_freep(&s->buf);
- return 0;
-}
-
-AVCodec ff_gif_encoder = {
- .name = "gif",
- .type = AVMEDIA_TYPE_VIDEO,
- .id = AV_CODEC_ID_GIF,
- .priv_data_size = sizeof(GIFContext),
- .init = gif_encode_init,
- .encode2 = gif_encode_frame,
- .close = gif_encode_close,
- .pix_fmts = (const enum AVPixelFormat[]){
- AV_PIX_FMT_RGB8, AV_PIX_FMT_BGR8, AV_PIX_FMT_RGB4_BYTE, AV_PIX_FMT_BGR4_BYTE,
- AV_PIX_FMT_GRAY8, AV_PIX_FMT_PAL8, AV_PIX_FMT_NONE
- },
- .long_name = NULL_IF_CONFIG_SMALL("GIF (Graphics Interchange Format)"),
-};
generated by cgit v1.2.3 (git 2.39.1) at 2025-12-06 17:35:16 +0000