diff options
Diffstat (limited to 'libavformat/gif.c')
| -rw-r--r-- | libavformat/gif.c | 171 |
1 files changed, 16 insertions, 155 deletions
diff --git a/libavformat/gif.c b/libavformat/gif.c index 11f9c171cf..55f6a581ac 100644 --- a/libavformat/gif.c +++ b/libavformat/gif.c @@ -40,84 +40,17 @@ */ #include "avformat.h" +#include "libavutil/avassert.h" +#include "libavutil/imgutils.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 - /* slows down the decoding (and some browsers don't like it) */ /* update on the 'some browsers don't like it issue from above: * this was probably due to missing 'Data Sub-block Terminator' * (byte 19) in the app_header */ #define GIF_ADD_APP_HEADER // required to enable looping of animated gif -typedef struct { - unsigned char r; - unsigned char g; - unsigned char b; -} rgb_triplet; - -/* we use the standard 216 color palette */ - -/* this script was used to create the palette: - * for r in 00 33 66 99 cc ff; do - * for g in 00 33 66 99 cc ff; do - * echo -n " " - * for b in 00 33 66 99 cc ff; do - * echo -n "{ 0x$r, 0x$g, 0x$b }, " - * done - * echo "" - * done - * done - */ - -static const rgb_triplet gif_clut[216] = { - { 0x00, 0x00, 0x00 }, { 0x00, 0x00, 0x33 }, { 0x00, 0x00, 0x66 }, { 0x00, 0x00, 0x99 }, { 0x00, 0x00, 0xcc }, { 0x00, 0x00, 0xff }, - { 0x00, 0x33, 0x00 }, { 0x00, 0x33, 0x33 }, { 0x00, 0x33, 0x66 }, { 0x00, 0x33, 0x99 }, { 0x00, 0x33, 0xcc }, { 0x00, 0x33, 0xff }, - { 0x00, 0x66, 0x00 }, { 0x00, 0x66, 0x33 }, { 0x00, 0x66, 0x66 }, { 0x00, 0x66, 0x99 }, { 0x00, 0x66, 0xcc }, { 0x00, 0x66, 0xff }, - { 0x00, 0x99, 0x00 }, { 0x00, 0x99, 0x33 }, { 0x00, 0x99, 0x66 }, { 0x00, 0x99, 0x99 }, { 0x00, 0x99, 0xcc }, { 0x00, 0x99, 0xff }, - { 0x00, 0xcc, 0x00 }, { 0x00, 0xcc, 0x33 }, { 0x00, 0xcc, 0x66 }, { 0x00, 0xcc, 0x99 }, { 0x00, 0xcc, 0xcc }, { 0x00, 0xcc, 0xff }, - { 0x00, 0xff, 0x00 }, { 0x00, 0xff, 0x33 }, { 0x00, 0xff, 0x66 }, { 0x00, 0xff, 0x99 }, { 0x00, 0xff, 0xcc }, { 0x00, 0xff, 0xff }, - { 0x33, 0x00, 0x00 }, { 0x33, 0x00, 0x33 }, { 0x33, 0x00, 0x66 }, { 0x33, 0x00, 0x99 }, { 0x33, 0x00, 0xcc }, { 0x33, 0x00, 0xff }, - { 0x33, 0x33, 0x00 }, { 0x33, 0x33, 0x33 }, { 0x33, 0x33, 0x66 }, { 0x33, 0x33, 0x99 }, { 0x33, 0x33, 0xcc }, { 0x33, 0x33, 0xff }, - { 0x33, 0x66, 0x00 }, { 0x33, 0x66, 0x33 }, { 0x33, 0x66, 0x66 }, { 0x33, 0x66, 0x99 }, { 0x33, 0x66, 0xcc }, { 0x33, 0x66, 0xff }, - { 0x33, 0x99, 0x00 }, { 0x33, 0x99, 0x33 }, { 0x33, 0x99, 0x66 }, { 0x33, 0x99, 0x99 }, { 0x33, 0x99, 0xcc }, { 0x33, 0x99, 0xff }, - { 0x33, 0xcc, 0x00 }, { 0x33, 0xcc, 0x33 }, { 0x33, 0xcc, 0x66 }, { 0x33, 0xcc, 0x99 }, { 0x33, 0xcc, 0xcc }, { 0x33, 0xcc, 0xff }, - { 0x33, 0xff, 0x00 }, { 0x33, 0xff, 0x33 }, { 0x33, 0xff, 0x66 }, { 0x33, 0xff, 0x99 }, { 0x33, 0xff, 0xcc }, { 0x33, 0xff, 0xff }, - { 0x66, 0x00, 0x00 }, { 0x66, 0x00, 0x33 }, { 0x66, 0x00, 0x66 }, { 0x66, 0x00, 0x99 }, { 0x66, 0x00, 0xcc }, { 0x66, 0x00, 0xff }, - { 0x66, 0x33, 0x00 }, { 0x66, 0x33, 0x33 }, { 0x66, 0x33, 0x66 }, { 0x66, 0x33, 0x99 }, { 0x66, 0x33, 0xcc }, { 0x66, 0x33, 0xff }, - { 0x66, 0x66, 0x00 }, { 0x66, 0x66, 0x33 }, { 0x66, 0x66, 0x66 }, { 0x66, 0x66, 0x99 }, { 0x66, 0x66, 0xcc }, { 0x66, 0x66, 0xff }, - { 0x66, 0x99, 0x00 }, { 0x66, 0x99, 0x33 }, { 0x66, 0x99, 0x66 }, { 0x66, 0x99, 0x99 }, { 0x66, 0x99, 0xcc }, { 0x66, 0x99, 0xff }, - { 0x66, 0xcc, 0x00 }, { 0x66, 0xcc, 0x33 }, { 0x66, 0xcc, 0x66 }, { 0x66, 0xcc, 0x99 }, { 0x66, 0xcc, 0xcc }, { 0x66, 0xcc, 0xff }, - { 0x66, 0xff, 0x00 }, { 0x66, 0xff, 0x33 }, { 0x66, 0xff, 0x66 }, { 0x66, 0xff, 0x99 }, { 0x66, 0xff, 0xcc }, { 0x66, 0xff, 0xff }, - { 0x99, 0x00, 0x00 }, { 0x99, 0x00, 0x33 }, { 0x99, 0x00, 0x66 }, { 0x99, 0x00, 0x99 }, { 0x99, 0x00, 0xcc }, { 0x99, 0x00, 0xff }, - { 0x99, 0x33, 0x00 }, { 0x99, 0x33, 0x33 }, { 0x99, 0x33, 0x66 }, { 0x99, 0x33, 0x99 }, { 0x99, 0x33, 0xcc }, { 0x99, 0x33, 0xff }, - { 0x99, 0x66, 0x00 }, { 0x99, 0x66, 0x33 }, { 0x99, 0x66, 0x66 }, { 0x99, 0x66, 0x99 }, { 0x99, 0x66, 0xcc }, { 0x99, 0x66, 0xff }, - { 0x99, 0x99, 0x00 }, { 0x99, 0x99, 0x33 }, { 0x99, 0x99, 0x66 }, { 0x99, 0x99, 0x99 }, { 0x99, 0x99, 0xcc }, { 0x99, 0x99, 0xff }, - { 0x99, 0xcc, 0x00 }, { 0x99, 0xcc, 0x33 }, { 0x99, 0xcc, 0x66 }, { 0x99, 0xcc, 0x99 }, { 0x99, 0xcc, 0xcc }, { 0x99, 0xcc, 0xff }, - { 0x99, 0xff, 0x00 }, { 0x99, 0xff, 0x33 }, { 0x99, 0xff, 0x66 }, { 0x99, 0xff, 0x99 }, { 0x99, 0xff, 0xcc }, { 0x99, 0xff, 0xff }, - { 0xcc, 0x00, 0x00 }, { 0xcc, 0x00, 0x33 }, { 0xcc, 0x00, 0x66 }, { 0xcc, 0x00, 0x99 }, { 0xcc, 0x00, 0xcc }, { 0xcc, 0x00, 0xff }, - { 0xcc, 0x33, 0x00 }, { 0xcc, 0x33, 0x33 }, { 0xcc, 0x33, 0x66 }, { 0xcc, 0x33, 0x99 }, { 0xcc, 0x33, 0xcc }, { 0xcc, 0x33, 0xff }, - { 0xcc, 0x66, 0x00 }, { 0xcc, 0x66, 0x33 }, { 0xcc, 0x66, 0x66 }, { 0xcc, 0x66, 0x99 }, { 0xcc, 0x66, 0xcc }, { 0xcc, 0x66, 0xff }, - { 0xcc, 0x99, 0x00 }, { 0xcc, 0x99, 0x33 }, { 0xcc, 0x99, 0x66 }, { 0xcc, 0x99, 0x99 }, { 0xcc, 0x99, 0xcc }, { 0xcc, 0x99, 0xff }, - { 0xcc, 0xcc, 0x00 }, { 0xcc, 0xcc, 0x33 }, { 0xcc, 0xcc, 0x66 }, { 0xcc, 0xcc, 0x99 }, { 0xcc, 0xcc, 0xcc }, { 0xcc, 0xcc, 0xff }, - { 0xcc, 0xff, 0x00 }, { 0xcc, 0xff, 0x33 }, { 0xcc, 0xff, 0x66 }, { 0xcc, 0xff, 0x99 }, { 0xcc, 0xff, 0xcc }, { 0xcc, 0xff, 0xff }, - { 0xff, 0x00, 0x00 }, { 0xff, 0x00, 0x33 }, { 0xff, 0x00, 0x66 }, { 0xff, 0x00, 0x99 }, { 0xff, 0x00, 0xcc }, { 0xff, 0x00, 0xff }, - { 0xff, 0x33, 0x00 }, { 0xff, 0x33, 0x33 }, { 0xff, 0x33, 0x66 }, { 0xff, 0x33, 0x99 }, { 0xff, 0x33, 0xcc }, { 0xff, 0x33, 0xff }, - { 0xff, 0x66, 0x00 }, { 0xff, 0x66, 0x33 }, { 0xff, 0x66, 0x66 }, { 0xff, 0x66, 0x99 }, { 0xff, 0x66, 0xcc }, { 0xff, 0x66, 0xff }, - { 0xff, 0x99, 0x00 }, { 0xff, 0x99, 0x33 }, { 0xff, 0x99, 0x66 }, { 0xff, 0x99, 0x99 }, { 0xff, 0x99, 0xcc }, { 0xff, 0x99, 0xff }, - { 0xff, 0xcc, 0x00 }, { 0xff, 0xcc, 0x33 }, { 0xff, 0xcc, 0x66 }, { 0xff, 0xcc, 0x99 }, { 0xff, 0xcc, 0xcc }, { 0xff, 0xcc, 0xff }, - { 0xff, 0xff, 0x00 }, { 0xff, 0xff, 0x33 }, { 0xff, 0xff, 0x66 }, { 0xff, 0xff, 0x99 }, { 0xff, 0xff, 0xcc }, { 0xff, 0xff, 0xff }, -}; - -/* GIF header */ static int gif_image_write_header(AVIOContext *pb, int width, int height, int loop_count, uint32_t *palette) { @@ -129,22 +62,21 @@ static int gif_image_write_header(AVIOContext *pb, int width, int height, avio_wl16(pb, width); avio_wl16(pb, height); + if (palette) { + /* TODO: reindent */ 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) { - avio_write(pb, (const unsigned char *)gif_clut, 216 * 3); - for (i = 0; i < ((256 - 216) * 3); i++) - avio_w8(pb, 0); - } else { for (i = 0; i < 256; i++) { v = palette[i]; avio_w8(pb, (v >> 16) & 0xff); avio_w8(pb, (v >> 8) & 0xff); avio_w8(pb, (v) & 0xff); } + } else { + avio_w8(pb, 0); /* flags */ + avio_w8(pb, 0); /* background color index */ + avio_w8(pb, 0); /* aspect ratio */ } /* update: this is the 'NETSCAPE EXTENSION' that allows for looped animated @@ -183,76 +115,6 @@ static int gif_image_write_header(AVIOContext *pb, int width, int height, return 0; } -/* 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); -} - -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) -{ - PutBitContext p; - uint8_t buffer[200]; /* 100 * 9 / 8 = 113 */ - int i, left, w, v; - const uint8_t *ptr; - /* image block */ - - 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 */ - - avio_w8(pb, 0x08); - - left = width * height; - - init_put_bits(&p, buffer, 130); - -/* - * the thing here is the bitstream is written as little packets, with a size - * byte before but it's still the same bitstream between packets (no flush !) - */ - ptr = buf; - w = width; - while (left > 0) { - put_bits(&p, 9, 0x0100); /* clear code */ - - for (i = (left < GIF_CHUNKS) ? left : GIF_CHUNKS; i; i--) { - if (pix_fmt == AV_PIX_FMT_RGB24) { - v = gif_clut_index(ptr[0], ptr[1], ptr[2]); - ptr += 3; - } else { - v = *ptr++; - } - put_bits(&p, 9, v); - if (--w == 0) { - w = width; - buf += linesize; - ptr = buf; - } - } - - if (left <= GIF_CHUNKS) { - put_bits(&p, 9, 0x101); /* end of stream */ - flush_put_bits(&p); - } - 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; - } - avio_w8(pb, 0x00); /* end of image block */ - - return 0; -} - typedef struct { AVClass *class; /** Class for private options. */ int64_t time, file_time; @@ -266,6 +128,7 @@ static int gif_write_header(AVFormatContext *s) AVIOContext *pb = s->pb; AVCodecContext *enc, *video_enc; int i, width, height /*, rate*/; + uint32_t palette[AVPALETTE_COUNT]; /* XXX: do we reject audio streams or just ignore them ? * if (s->nb_streams > 1) @@ -290,14 +153,13 @@ static int gif_write_header(AVFormatContext *s) // rate = video_enc->time_base.den; } - if (video_enc->pix_fmt != AV_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 (avpriv_set_systematic_pal2(palette, video_enc->pix_fmt) < 0) { + av_assert0(video_enc->pix_fmt == AV_PIX_FMT_PAL8); + gif_image_write_header(pb, width, height, gif->loop, NULL); + } else { + gif_image_write_header(pb, width, height, gif->loop, palette); } - gif_image_write_header(pb, width, height, gif->loop, NULL); - avio_flush(s->pb); return 0; } @@ -326,8 +188,7 @@ static int gif_write_video(AVFormatContext *s, AVCodecContext *enc, 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, AV_PIX_FMT_RGB24); + avio_write(pb, buf, size); return 0; } @@ -372,7 +233,7 @@ AVOutputFormat ff_gif_muxer = { .extensions = "gif", .priv_data_size = sizeof(GIFContext), .audio_codec = AV_CODEC_ID_NONE, - .video_codec = AV_CODEC_ID_RAWVIDEO, + .video_codec = AV_CODEC_ID_GIF, .write_header = gif_write_header, .write_packet = gif_write_packet, .write_trailer = gif_write_trailer, |