diff options
Diffstat (limited to 'ffmpeg/libavcodec/gif.c')
| -rw-r--r-- | ffmpeg/libavcodec/gif.c | 321 |
1 files changed, 0 insertions, 321 deletions
diff --git a/ffmpeg/libavcodec/gif.c b/ffmpeg/libavcodec/gif.c deleted file mode 100644 index 27d054e..0000000 --- a/ffmpeg/libavcodec/gif.c +++ /dev/null @@ -1,321 +0,0 @@ -/* - * Copyright (c) 2000 Fabrice Bellard - * Copyright (c) 2002 Francois Revol - * Copyright (c) 2006 Baptiste Coudurier - * - * first version by Francois Revol <revol@free.fr> - * - * 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 - */ - -/** - * @file - * GIF encoder - * @see http://www.w3.org/Graphics/GIF/spec-gif89a.txt - */ - -#define BITSTREAM_WRITER_LE -#include "libavutil/opt.h" -#include "libavutil/imgutils.h" -#include "avcodec.h" -#include "bytestream.h" -#include "internal.h" -#include "lzw.h" -#include "gif.h" - -#include "put_bits.h" - -typedef struct { - const AVClass *class; - LZWState *lzw; - uint8_t *buf; - AVFrame *last_frame; - int flags; - uint32_t palette[AVPALETTE_COUNT]; ///< local reference palette for !pal8 - uint8_t *tmpl; ///< temporary line buffer -} GIFContext; - -enum { - GF_OFFSETTING = 1<<0, - GF_TRANSDIFF = 1<<1, -}; - -static int pick_palette_entry(const uint8_t *buf, int linesize, int w, int h) -{ - int histogram[AVPALETTE_COUNT] = {0}; - int x, y, i; - - for (y = 0; y < h; y++) { - for (x = 0; x < w; x++) - histogram[buf[x]]++; - buf += linesize; - } - for (i = 0; i < FF_ARRAY_ELEMS(histogram); i++) - if (!histogram[i]) - return i; - return -1; -} - -static int gif_image_write_image(AVCodecContext *avctx, - uint8_t **bytestream, uint8_t *end, - const uint32_t *palette, - const uint8_t *buf, const int linesize, - AVPacket *pkt) -{ - GIFContext *s = avctx->priv_data; - int len = 0, height = avctx->height, width = avctx->width, x, y; - int x_start = 0, y_start = 0, trans = -1; - const uint8_t *ptr; - - /* Crop image */ - // TODO support with palette change - if ((s->flags & GF_OFFSETTING) && s->last_frame && !palette) { - const uint8_t *ref = s->last_frame->data[0]; - const int ref_linesize = s->last_frame->linesize[0]; - int x_end = avctx->width - 1, - y_end = avctx->height - 1; - - /* skip common lines */ - while (y_start < y_end) { - if (memcmp(ref + y_start*ref_linesize, buf + y_start*linesize, width)) - break; - y_start++; - } - while (y_end > y_start) { - if (memcmp(ref + y_end*ref_linesize, buf + y_end*linesize, width)) - break; - y_end--; - } - height = y_end + 1 - y_start; - - /* skip common columns */ - while (x_start < x_end) { - int same_column = 1; - for (y = y_start; y < y_end; y++) { - if (ref[y*ref_linesize + x_start] != buf[y*linesize + x_start]) { - same_column = 0; - break; - } - } - if (!same_column) - break; - x_start++; - } - while (x_end > x_start) { - int same_column = 1; - for (y = y_start; y < y_end; y++) { - if (ref[y*ref_linesize + x_end] != buf[y*linesize + x_end]) { - same_column = 0; - break; - } - } - if (!same_column) - break; - x_end--; - } - width = x_end + 1 - x_start; - - av_log(avctx, AV_LOG_DEBUG,"%dx%d image at pos (%d;%d) [area:%dx%d]\n", - width, height, x_start, y_start, avctx->width, avctx->height); - } - - /* image block */ - bytestream_put_byte(bytestream, GIF_IMAGE_SEPARATOR); - bytestream_put_le16(bytestream, x_start); - bytestream_put_le16(bytestream, y_start); - bytestream_put_le16(bytestream, width); - bytestream_put_le16(bytestream, height); - - if (!palette) { - bytestream_put_byte(bytestream, 0x00); /* flags */ - } else { - unsigned i; - bytestream_put_byte(bytestream, 1<<7 | 0x7); /* flags */ - for (i = 0; i < AVPALETTE_COUNT; i++) { - const uint32_t v = palette[i]; - bytestream_put_be24(bytestream, v); - } - } - - /* TODO: support with palette change (pal8) */ - if ((s->flags & GF_TRANSDIFF) && s->last_frame && !palette) { - trans = pick_palette_entry(buf + y_start*linesize + x_start, - linesize, width, height); - if (trans < 0) { // TODO, patch welcome - av_log(avctx, AV_LOG_DEBUG, "No available color, can not use transparency\n"); - } else { - uint8_t *pal_exdata = av_packet_new_side_data(pkt, AV_PKT_DATA_PALETTE, AVPALETTE_SIZE); - if (!pal_exdata) - return AVERROR(ENOMEM); - memcpy(pal_exdata, s->palette, AVPALETTE_SIZE); - pal_exdata[trans*4 + 3*!HAVE_BIGENDIAN] = 0x00; - } - } - - bytestream_put_byte(bytestream, 0x08); - - ff_lzw_encode_init(s->lzw, s->buf, 2 * width * height, - 12, FF_LZW_GIF, put_bits); - - ptr = buf + y_start*linesize + x_start; - if (trans >= 0) { - const int ref_linesize = s->last_frame->linesize[0]; - const uint8_t *ref = s->last_frame->data[0] + y_start*ref_linesize + x_start; - - for (y = 0; y < height; y++) { - memcpy(s->tmpl, ptr, width); - for (x = 0; x < width; x++) - if (ref[x] == ptr[x]) - s->tmpl[x] = trans; - len += ff_lzw_encode(s->lzw, s->tmpl, width); - ptr += linesize; - ref += ref_linesize; - } - } else { - for (y = 0; y < height; y++) { - len += ff_lzw_encode(s->lzw, ptr, 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 */ - 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 AVERROR(EINVAL); - } - - avctx->coded_frame = av_frame_alloc(); - if (!avctx->coded_frame) - return AVERROR(ENOMEM); - - avctx->coded_frame->pict_type = AV_PICTURE_TYPE_I; - avctx->coded_frame->key_frame = 1; - - s->lzw = av_mallocz(ff_lzw_encode_state_size); - s->buf = av_malloc(avctx->width*avctx->height*2); - s->tmpl = av_malloc(avctx->width); - if (!s->tmpl || !s->buf || !s->lzw) - return AVERROR(ENOMEM); - - if (avpriv_set_systematic_pal2(s->palette, avctx->pix_fmt) < 0) - av_assert0(avctx->pix_fmt == AV_PIX_FMT_PAL8); - - return 0; -} - -static int gif_encode_frame(AVCodecContext *avctx, AVPacket *pkt, - const AVFrame *pict, int *got_packet) -{ - GIFContext *s = avctx->priv_data; - uint8_t *outbuf_ptr, *end; - const uint32_t *palette = NULL; - 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; - - if (avctx->pix_fmt == AV_PIX_FMT_PAL8) { - uint8_t *pal_exdata = av_packet_new_side_data(pkt, AV_PKT_DATA_PALETTE, AVPALETTE_SIZE); - if (!pal_exdata) - return AVERROR(ENOMEM); - memcpy(pal_exdata, pict->data[1], AVPALETTE_SIZE); - palette = (uint32_t*)pict->data[1]; - } - - gif_image_write_image(avctx, &outbuf_ptr, end, palette, - pict->data[0], pict->linesize[0], pkt); - if (!s->last_frame) { - s->last_frame = av_frame_alloc(); - if (!s->last_frame) - return AVERROR(ENOMEM); - } - av_frame_unref(s->last_frame); - ret = av_frame_ref(s->last_frame, (AVFrame*)pict); - if (ret < 0) - return ret; - - 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_frame_free(&avctx->coded_frame); - - av_freep(&s->lzw); - av_freep(&s->buf); - av_frame_free(&s->last_frame); - av_freep(&s->tmpl); - return 0; -} - -#define OFFSET(x) offsetof(GIFContext, x) -#define FLAGS AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_ENCODING_PARAM -static const AVOption gif_options[] = { - { "gifflags", "set GIF flags", OFFSET(flags), AV_OPT_TYPE_FLAGS, {.i64 = GF_OFFSETTING|GF_TRANSDIFF}, 0, INT_MAX, FLAGS, "flags" }, - { "offsetting", "enable picture offsetting", 0, AV_OPT_TYPE_CONST, {.i64=GF_OFFSETTING}, INT_MIN, INT_MAX, FLAGS, "flags" }, - { "transdiff", "enable transparency detection between frames", 0, AV_OPT_TYPE_CONST, {.i64=GF_TRANSDIFF}, INT_MIN, INT_MAX, FLAGS, "flags" }, - { NULL } -}; - -static const AVClass gif_class = { - .class_name = "GIF encoder", - .item_name = av_default_item_name, - .option = gif_options, - .version = LIBAVUTIL_VERSION_INT, -}; - -AVCodec ff_gif_encoder = { - .name = "gif", - .long_name = NULL_IF_CONFIG_SMALL("GIF (Graphics Interchange Format)"), - .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 - }, - .priv_class = &gif_class, -}; 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