mirror of https://git.ffmpeg.org/ffmpeg.git
added primitive image GIF encoder based on animated gif encoder
Originally committed as revision 1540 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Fabrice Bellard
parent
fcfa89e81c
commit
ba19f84810
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@ -166,9 +166,114 @@ static void gif_flush_put_bits_rev(PutBitContext *s)
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/* !RevPutBitContext */
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/* GIF header */
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static int gif_image_write_header(ByteIOContext *pb, int width, int height)
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{
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int i;
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put_tag(pb, "GIF");
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put_tag(pb, "89a");
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put_le16(pb, width);
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put_le16(pb, height);
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put_byte(pb, 0xf7); /* flags: global clut, 256 entries */
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put_byte(pb, 0x1f); /* background color index */
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put_byte(pb, 0); /* aspect ratio */
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/* the global palette */
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put_buffer(pb, (unsigned char *)gif_clut, 216*3);
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for(i=0;i<((256-216)*3);i++)
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put_byte(pb, 0);
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/* application extension header */
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/* XXX: not really sure what to put in here... */
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#ifdef GIF_ADD_APP_HEADER
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put_byte(pb, 0x21);
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put_byte(pb, 0xff);
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put_byte(pb, 0x0b);
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put_tag(pb, "NETSCAPE2.0");
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put_byte(pb, 0x03);
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put_byte(pb, 0x01);
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put_byte(pb, 0x00);
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put_byte(pb, 0x00);
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#endif
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return 0;
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}
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/* this is maybe slow, but allows for extensions */
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static inline unsigned char gif_clut_index(rgb_triplet *clut, UINT8 r, UINT8 g, UINT8 b)
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{
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return ((((r)/47)%6)*6*6+(((g)/47)%6)*6+(((b)/47)%6));
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}
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static int gif_image_write_image(ByteIOContext *pb,
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int x1, int y1, int width, int height,
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uint8_t *buf, int linesize)
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{
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PutBitContext p;
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UINT8 buffer[200]; /* 100 * 9 / 8 = 113 */
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int i, left, w;
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uint8_t *ptr;
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/* image block */
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put_byte(pb, 0x2c);
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put_le16(pb, x1);
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put_le16(pb, y1);
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put_le16(pb, width);
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put_le16(pb, height);
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put_byte(pb, 0x00); /* flags */
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/* no local clut */
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put_byte(pb, 0x08);
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left= width * height;
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init_put_bits(&p, buffer, 130, NULL, NULL);
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/*
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* the thing here is the bitstream is written as little packets, with a size byte before
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* but it's still the same bitstream between packets (no flush !)
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*/
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ptr = buf;
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w = width;
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while(left>0) {
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gif_put_bits_rev(&p, 9, 0x0100); /* clear code */
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for(i=0;i<GIF_CHUNKS;i++) {
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gif_put_bits_rev(&p, 9, gif_clut_index(NULL, ptr[0], ptr[1], ptr[2]));
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ptr+=3;
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if (--w == 0) {
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w = width;
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buf += linesize;
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ptr = buf;
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}
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}
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if(left<=GIF_CHUNKS) {
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gif_put_bits_rev(&p, 9, 0x101); /* end of stream */
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gif_flush_put_bits_rev(&p);
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}
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if(pbBufPtr(&p) - p.buf > 0) {
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put_byte(pb, pbBufPtr(&p) - p.buf); /* byte count of the packet */
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put_buffer(pb, p.buf, pbBufPtr(&p) - p.buf); /* the actual buffer */
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p.data_out_size += pbBufPtr(&p) - p.buf;
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p.buf_ptr = p.buf; /* dequeue the bytes off the bitstream */
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}
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if(left<=GIF_CHUNKS) {
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put_byte(pb, 0x00); /* end of image block */
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}
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left-=GIF_CHUNKS;
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}
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return 0;
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}
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typedef struct {
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UINT8 buffer[100]; /* data chunks */
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INT64 time, file_time;
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UINT8 buffer[100]; /* data chunks */
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} GIFContext;
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static int gif_write_header(AVFormatContext *s)
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@ -204,46 +309,12 @@ static int gif_write_header(AVFormatContext *s)
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/* XXX: is it allowed ? seems to work so far... */
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video_enc->pix_fmt = PIX_FMT_RGB24;
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/* GIF header */
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put_tag(pb, "GIF");
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put_tag(pb, "89a");
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put_le16(pb, width);
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put_le16(pb, height);
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put_byte(pb, 0xf7); /* flags: global clut, 256 entries */
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put_byte(pb, 0x1f); /* background color index */
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put_byte(pb, 0); /* aspect ratio */
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/* the global palette */
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put_buffer(pb, (unsigned char *)gif_clut, 216*3);
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for(i=0;i<((256-216)*3);i++)
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put_byte(pb, 0);
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/* application extension header */
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/* XXX: not really sure what to put in here... */
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#ifdef GIF_ADD_APP_HEADER
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put_byte(pb, 0x21);
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put_byte(pb, 0xff);
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put_byte(pb, 0x0b);
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put_tag(pb, "NETSCAPE2.0");
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put_byte(pb, 0x03);
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put_byte(pb, 0x01);
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put_byte(pb, 0x00);
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put_byte(pb, 0x00);
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#endif
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gif_image_write_header(pb, width, height);
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put_flush_packet(&s->pb);
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return 0;
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}
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/* this is maybe slow, but allows for extensions */
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static inline unsigned char gif_clut_index(rgb_triplet *clut, UINT8 r, UINT8 g, UINT8 b)
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{
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return ((((r)/47)%6)*6*6+(((g)/47)%6)*6+(((b)/47)%6));
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}
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/* chunk writer callback */
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/* !!! XXX:deprecated
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static void gif_put_chunk(void *pbctx, UINT8 *buffer, int count)
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@ -259,11 +330,8 @@ static int gif_write_video(AVFormatContext *s,
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{
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ByteIOContext *pb = &s->pb;
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GIFContext *gif = s->priv_data;
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int i, left, jiffies;
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int jiffies;
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INT64 delay;
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PutBitContext p;
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UINT8 buffer[200]; /* 100 * 9 / 8 = 113 */
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/* graphic control extension block */
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put_byte(pb, 0x21);
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@ -285,52 +353,8 @@ static int gif_write_video(AVFormatContext *s,
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put_byte(pb, 0x1f); /* transparent color index */
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put_byte(pb, 0x00);
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/* image block */
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put_byte(pb, 0x2c);
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put_le16(pb, 0);
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put_le16(pb, 0);
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put_le16(pb, enc->width);
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put_le16(pb, enc->height);
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put_byte(pb, 0x00); /* flags */
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/* no local clut */
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put_byte(pb, 0x08);
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left=size/3;
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init_put_bits(&p, buffer, 130, NULL, NULL);
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/*
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* the thing here is the bitstream is written as little packets, with a size byte before
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* but it's still the same bitstream between packets (no flush !)
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*/
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while(left>0) {
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gif_put_bits_rev(&p, 9, 0x0100); /* clear code */
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for(i=0;i<GIF_CHUNKS;i++) {
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gif_put_bits_rev(&p, 9, gif_clut_index(NULL, *buf, buf[1], buf[2]));
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buf+=3;
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}
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if(left<=GIF_CHUNKS) {
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gif_put_bits_rev(&p, 9, 0x101); /* end of stream */
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gif_flush_put_bits_rev(&p);
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}
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if(pbBufPtr(&p) - p.buf > 0) {
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put_byte(pb, pbBufPtr(&p) - p.buf); /* byte count of the packet */
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put_buffer(pb, p.buf, pbBufPtr(&p) - p.buf); /* the actual buffer */
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p.data_out_size += pbBufPtr(&p) - p.buf;
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p.buf_ptr = p.buf; /* dequeue the bytes off the bitstream */
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}
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if(left<=GIF_CHUNKS) {
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put_byte(pb, 0x00); /* end of image block */
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}
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left-=GIF_CHUNKS;
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}
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gif_image_write_image(pb, 0, 0, enc->width, enc->height,
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buf, enc->width * 3);
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put_flush_packet(&s->pb);
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return 0;
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@ -355,6 +379,17 @@ static int gif_write_trailer(AVFormatContext *s)
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return 0;
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}
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/* better than nothing gif image writer */
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int gif_write(ByteIOContext *pb, AVImageInfo *info)
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{
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gif_image_write_header(pb, info->width, info->height);
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gif_image_write_image(pb, 0, 0, info->width, info->height,
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info->pict.data[0], info->pict.linesize[0]);
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put_byte(pb, 0x3b);
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put_flush_packet(pb);
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return 0;
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}
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static AVOutputFormat gif_oformat = {
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"gif",
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"GIF Animation",
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@ -367,6 +402,7 @@ static AVOutputFormat gif_oformat = {
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gif_write_packet,
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gif_write_trailer,
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};
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extern AVInputFormat gif_iformat;
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int gif_init(void)
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