X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=libavformat%2Fgif.c;h=3ef7ebe9be431043e6c2a32461786219848720aa;hb=196bf28c5d858e1594f9677fcab8677aca17ad33;hp=bef98d3ac47188e7628327763c1871b9cabb738b;hpb=ff70e60176056daf646109b8e42654a3036fa02b;p=ffmpeg diff --git a/libavformat/gif.c b/libavformat/gif.c index bef98d3ac47..3ef7ebe9be4 100644 --- a/libavformat/gif.c +++ b/libavformat/gif.c @@ -1,19 +1,21 @@ /* - * Animated GIF encoder - * Copyright (c) 2000 Fabrice Bellard. + * Animated GIF muxer + * Copyright (c) 2000 Fabrice Bellard * - * This library is free software; you can redistribute it and/or + * This file is part of Libav. + * + * Libav 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 of the License, or (at your option) any later version. + * version 2.1 of the License, or (at your option) any later version. * - * This library is distributed in the hope that it will be useful, + * Libav 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 this library; if not, write to the Free Software + * License along with Libav; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ @@ -38,7 +40,14 @@ */ #include "avformat.h" -#include "bitstream.h" +#include "libavutil/log.h" +#include "libavutil/opt.h" + +/* The GIF format uses reversed order for bitstreams... */ +/* at least they don't use PDP_ENDIAN :) */ +#define BITSTREAM_WRITER_LE + +#include "libavcodec/put_bits.h" /* bitstream minipacket size */ #define GIF_CHUNKS 100 @@ -99,100 +108,34 @@ 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) - 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(ByteIOContext *pb, +static int gif_image_write_header(AVIOContext *pb, int width, int height, int loop_count, uint32_t *palette) { int i; unsigned int v; - put_tag(pb, "GIF"); - put_tag(pb, "89a"); - put_le16(pb, width); - put_le16(pb, height); + avio_write(pb, "GIF", 3); + avio_write(pb, "89a", 3); + avio_wl16(pb, width); + avio_wl16(pb, height); - put_byte(pb, 0xf7); /* flags: global clut, 256 entries */ - put_byte(pb, 0x1f); /* background color index */ - put_byte(pb, 0); /* aspect ratio */ + avio_w8(pb, 0xf7); /* flags: global clut, 256 entries */ + avio_w8(pb, 0x1f); /* background color index */ + avio_w8(pb, 0); /* aspect ratio */ /* the global palette */ if (!palette) { - put_buffer(pb, (const unsigned char *)gif_clut, 216*3); + avio_write(pb, (const unsigned char *)gif_clut, 216*3); for(i=0;i<((256-216)*3);i++) - put_byte(pb, 0); + avio_w8(pb, 0); } else { for(i=0;i<256;i++) { v = palette[i]; - put_byte(pb, (v >> 16) & 0xff); - put_byte(pb, (v >> 8) & 0xff); - put_byte(pb, (v) & 0xff); + avio_w8(pb, (v >> 16) & 0xff); + avio_w8(pb, (v >> 8) & 0xff); + avio_w8(pb, (v) & 0xff); } } @@ -218,14 +161,14 @@ static int gif_image_write_header(ByteIOContext *pb, /* application extension header */ #ifdef GIF_ADD_APP_HEADER if (loop_count >= 0 && loop_count <= 65535) { - put_byte(pb, 0x21); - put_byte(pb, 0xff); - put_byte(pb, 0x0b); - put_tag(pb, "NETSCAPE2.0"); // bytes 4 to 14 - put_byte(pb, 0x03); // byte 15 - put_byte(pb, 0x01); // byte 16 - put_le16(pb, (uint16_t)loop_count); - put_byte(pb, 0x00); // byte 19 + avio_w8(pb, 0x21); + avio_w8(pb, 0xff); + avio_w8(pb, 0x0b); + avio_write(pb, "NETSCAPE2.0", sizeof("NETSCAPE2.0") - 1); // bytes 4 to 14 + avio_w8(pb, 0x03); // byte 15 + avio_w8(pb, 0x01); // byte 16 + avio_wl16(pb, (uint16_t)loop_count); + avio_w8(pb, 0x00); // byte 19 } #endif return 0; @@ -234,11 +177,11 @@ static int gif_image_write_header(ByteIOContext *pb, /* 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)); + return (((r) / 47) % 6) * 6 * 6 + (((g) / 47) % 6) * 6 + (((b) / 47) % 6); } -static int gif_image_write_image(ByteIOContext *pb, +static int gif_image_write_image(AVIOContext *pb, int x1, int y1, int width, int height, const uint8_t *buf, int linesize, int pix_fmt) { @@ -248,15 +191,15 @@ static int gif_image_write_image(ByteIOContext *pb, const uint8_t *ptr; /* image block */ - put_byte(pb, 0x2c); - put_le16(pb, x1); - put_le16(pb, y1); - put_le16(pb, width); - put_le16(pb, height); - put_byte(pb, 0x00); /* flags */ + avio_w8(pb, 0x2c); + avio_wl16(pb, x1); + avio_wl16(pb, y1); + avio_wl16(pb, width); + avio_wl16(pb, height); + avio_w8(pb, 0x00); /* flags */ /* no local clut */ - put_byte(pb, 0x08); + avio_w8(pb, 0x08); left= width * height; @@ -270,7 +213,7 @@ 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 0) { - put_byte(pb, pbBufPtr(&p) - p.buf); /* byte count of the packet */ - put_buffer(pb, p.buf, pbBufPtr(&p) - p.buf); /* the actual buffer */ + if(put_bits_ptr(&p) - p.buf > 0) { + avio_w8(pb, put_bits_ptr(&p) - p.buf); /* byte count of the packet */ + avio_write(pb, p.buf, put_bits_ptr(&p) - p.buf); /* the actual buffer */ p.buf_ptr = p.buf; /* dequeue the bytes off the bitstream */ } left-=GIF_CHUNKS; } - put_byte(pb, 0x00); /* end of image block */ + avio_w8(pb, 0x00); /* end of image block */ return 0; } typedef struct { + AVClass *class; /** Class for private options. */ int64_t time, file_time; uint8_t buffer[100]; /* data chunks */ + int loop; } GIFContext; static int gif_write_header(AVFormatContext *s) { GIFContext *gif = s->priv_data; - ByteIOContext *pb = &s->pb; + AVIOContext *pb = s->pb; AVCodecContext *enc, *video_enc; - int i, width, height, loop_count /*, rate*/; + int i, width, height /*, rate*/; /* XXX: do we reject audio streams or just ignore them ? if(s->nb_streams > 1) @@ -325,7 +270,7 @@ static int gif_write_header(AVFormatContext *s) video_enc = NULL; for(i=0;inb_streams;i++) { enc = s->streams[i]->codec; - if (enc->codec_type != CODEC_TYPE_AUDIO) + if (enc->codec_type != AVMEDIA_TYPE_AUDIO) video_enc = enc; } @@ -335,58 +280,60 @@ static int gif_write_header(AVFormatContext *s) } else { width = video_enc->width; height = video_enc->height; - loop_count = s->loop_output; // rate = video_enc->time_base.den; } - /* XXX: is it allowed ? seems to work so far... */ - video_enc->pix_fmt = PIX_FMT_RGB24; + if (video_enc->pix_fmt != PIX_FMT_RGB24) { + av_log(s, AV_LOG_ERROR, "ERROR: gif only handles the rgb24 pixel format. Use -pix_fmt rgb24.\n"); + return AVERROR(EIO); + } + +#if FF_API_LOOP_OUTPUT + if (s->loop_output) + gif->loop = s->loop_output; +#endif - gif_image_write_header(pb, width, height, loop_count, NULL); + gif_image_write_header(pb, width, height, gif->loop, NULL); - put_flush_packet(&s->pb); + avio_flush(s->pb); return 0; } static int gif_write_video(AVFormatContext *s, AVCodecContext *enc, const uint8_t *buf, int size) { - ByteIOContext *pb = &s->pb; - GIFContext *gif = s->priv_data; + AVIOContext *pb = s->pb; int jiffies; - int64_t delay; /* graphic control extension block */ - put_byte(pb, 0x21); - put_byte(pb, 0xf9); - put_byte(pb, 0x04); /* block size */ - put_byte(pb, 0x04); /* flags */ + avio_w8(pb, 0x21); + avio_w8(pb, 0xf9); + avio_w8(pb, 0x04); /* block size */ + avio_w8(pb, 0x04); /* flags */ /* 1 jiffy is 1/70 s */ /* the delay_time field indicates the number of jiffies - 1 */ - delay = gif->file_time - gif->time; - /* XXX: should use delay, in order to be more accurate */ /* instead of using the same rounded value each time */ /* XXX: don't even remember if I really use it for now */ jiffies = (70*enc->time_base.num/enc->time_base.den) - 1; - put_le16(pb, jiffies); + avio_wl16(pb, jiffies); - put_byte(pb, 0x1f); /* transparent color index */ - put_byte(pb, 0x00); + avio_w8(pb, 0x1f); /* transparent color index */ + avio_w8(pb, 0x00); gif_image_write_image(pb, 0, 0, enc->width, enc->height, buf, enc->width * 3, PIX_FMT_RGB24); - put_flush_packet(&s->pb); + avio_flush(s->pb); return 0; } static int gif_write_packet(AVFormatContext *s, AVPacket *pkt) { AVCodecContext *codec = s->streams[pkt->stream_index]->codec; - if (codec->codec_type == CODEC_TYPE_AUDIO) + if (codec->codec_type == AVMEDIA_TYPE_AUDIO) return 0; /* just ignore audio */ else return gif_write_video(s, codec, pkt->data, pkt->size); @@ -394,35 +341,37 @@ static int gif_write_packet(AVFormatContext *s, AVPacket *pkt) static int gif_write_trailer(AVFormatContext *s) { - ByteIOContext *pb = &s->pb; + AVIOContext *pb = s->pb; - put_byte(pb, 0x3b); - put_flush_packet(&s->pb); + avio_w8(pb, 0x3b); + avio_flush(s->pb); return 0; } -/* better than nothing gif image writer */ -int gif_write(ByteIOContext *pb, AVImageInfo *info) -{ - gif_image_write_header(pb, info->width, info->height, AVFMT_NOOUTPUTLOOP, - (uint32_t *)info->pict.data[1]); - gif_image_write_image(pb, 0, 0, info->width, info->height, - info->pict.data[0], info->pict.linesize[0], - PIX_FMT_PAL8); - put_byte(pb, 0x3b); - put_flush_packet(pb); - return 0; -} +#define OFFSET(x) offsetof(GIFContext, x) +#define ENC AV_OPT_FLAG_ENCODING_PARAM +static const AVOption options[] = { + { "loop", "Number of times to loop the output.", OFFSET(loop), AV_OPT_TYPE_INT, {0}, 0, 65535, ENC }, + { NULL }, +}; + +static const AVClass gif_muxer_class = { + .class_name = "GIF muxer", + .item_name = av_default_item_name, + .version = LIBAVUTIL_VERSION_INT, + .option = options, +}; -AVOutputFormat gif_muxer = { - "gif", - "GIF Animation", - "image/gif", - "gif", - sizeof(GIFContext), - CODEC_ID_NONE, - CODEC_ID_RAWVIDEO, - gif_write_header, - gif_write_packet, - gif_write_trailer, +AVOutputFormat ff_gif_muxer = { + .name = "gif", + .long_name = NULL_IF_CONFIG_SMALL("GIF Animation"), + .mime_type = "image/gif", + .extensions = "gif", + .priv_data_size = sizeof(GIFContext), + .audio_codec = CODEC_ID_NONE, + .video_codec = CODEC_ID_RAWVIDEO, + .write_header = gif_write_header, + .write_packet = gif_write_packet, + .write_trailer = gif_write_trailer, + .priv_class = &gif_muxer_class, };