[FFmpeg-devel] [PATCH 3/6] avcodec/gif: support crop and transparency with PAL8
Clément Bœsch
u at pkh.me
Mon Feb 9 18:35:11 CET 2015
---
libavcodec/gif.c | 53 ++++++-
tests/ref/fate/gifenc-pal8 | 346 ++++++++++++++++++++++-----------------------
2 files changed, 220 insertions(+), 179 deletions(-)
diff --git a/libavcodec/gif.c b/libavcodec/gif.c
index 27d054e..12a039e 100644
--- a/libavcodec/gif.c
+++ b/libavcodec/gif.c
@@ -46,6 +46,9 @@ typedef struct {
AVFrame *last_frame;
int flags;
uint32_t palette[AVPALETTE_COUNT]; ///< local reference palette for !pal8
+ int palette_loaded;
+ int transparent_index;
+ uint8_t *pal_exdata;
uint8_t *tmpl; ///< temporary line buffer
} GIFContext;
@@ -78,11 +81,11 @@ static int gif_image_write_image(AVCodecContext *avctx,
{
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;
+ int x_start = 0, y_start = 0, trans = s->transparent_index;
+ int honor_transparency = (s->flags & GF_TRANSDIFF) && s->last_frame;
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];
@@ -151,20 +154,23 @@ static int gif_image_write_image(AVCodecContext *avctx,
}
}
- /* TODO: support with palette change (pal8) */
- if ((s->flags & GF_TRANSDIFF) && s->last_frame && !palette) {
+ if (honor_transparency && trans < 0) {
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);
+ uint8_t *pal_exdata = s->pal_exdata;
+ if (!pal_exdata)
+ 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;
}
}
+ if (trans < 0)
+ honor_transparency = 0;
bytestream_put_byte(bytestream, 0x08);
@@ -172,7 +178,7 @@ static int gif_image_write_image(AVCodecContext *avctx,
12, FF_LZW_GIF, put_bits);
ptr = buf + y_start*linesize + x_start;
- if (trans >= 0) {
+ if (honor_transparency) {
const int ref_linesize = s->last_frame->linesize[0];
const uint8_t *ref = s->last_frame->data[0] + y_start*ref_linesize + x_start;
@@ -223,6 +229,8 @@ static av_cold int gif_encode_init(AVCodecContext *avctx)
avctx->coded_frame->pict_type = AV_PICTURE_TYPE_I;
avctx->coded_frame->key_frame = 1;
+ s->transparent_index = -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);
@@ -235,6 +243,25 @@ static av_cold int gif_encode_init(AVCodecContext *avctx)
return 0;
}
+/* FIXME: duplicated with lavc */
+static int get_palette_transparency_index(const uint32_t *palette)
+{
+ int transparent_color_index = -1;
+ unsigned i, smallest_alpha = 0xff;
+
+ if (!palette)
+ return -1;
+
+ for (i = 0; i < AVPALETTE_COUNT; i++) {
+ const uint32_t v = palette[i];
+ if (v >> 24 < smallest_alpha) {
+ smallest_alpha = v >> 24;
+ transparent_color_index = i;
+ }
+ }
+ return smallest_alpha < 128 ? transparent_color_index : -1;
+}
+
static int gif_encode_frame(AVCodecContext *avctx, AVPacket *pkt,
const AVFrame *pict, int *got_packet)
{
@@ -254,6 +281,20 @@ static int gif_encode_frame(AVCodecContext *avctx, AVPacket *pkt,
return AVERROR(ENOMEM);
memcpy(pal_exdata, pict->data[1], AVPALETTE_SIZE);
palette = (uint32_t*)pict->data[1];
+
+ s->pal_exdata = pal_exdata;
+
+ /* The first palette with PAL8 will be used as generic palette by the
+ * muxer so we don't need to write it locally in the packet. We store
+ * it as a reference here in case it changes later. */
+ if (!s->palette_loaded) {
+ memcpy(s->palette, palette, AVPALETTE_SIZE);
+ s->transparent_index = get_palette_transparency_index(palette);
+ s->palette_loaded = 1;
+ palette = NULL;
+ } else if (!memcmp(s->palette, palette, AVPALETTE_SIZE)) {
+ palette = NULL;
+ }
}
gif_image_write_image(avctx, &outbuf_ptr, end, palette,
diff --git a/tests/ref/fate/gifenc-pal8 b/tests/ref/fate/gifenc-pal8
index 203a154..ede614c 100644
--- a/tests/ref/fate/gifenc-pal8
+++ b/tests/ref/fate/gifenc-pal8
@@ -1,174 +1,174 @@
#tb 0: 1/10
-0, 0, 0, 1, 1320, 0x95d1a9e9, S=1, 1024, 0xec907a9e
-0, 1, 1, 1, 1463, 0xa697fe95, S=1, 1024, 0xec907a9e
-0, 2, 2, 1, 1638, 0x7ea154fa, S=1, 1024, 0xec907a9e
-0, 3, 3, 1, 1755, 0x7e0b9c4d, S=1, 1024, 0xec907a9e
-0, 4, 4, 1, 1896, 0x4aacc768, S=1, 1024, 0xec907a9e
-0, 5, 5, 1, 2038, 0x209d1490, S=1, 1024, 0xec907a9e
-0, 6, 6, 1, 2168, 0x0c405606, S=1, 1024, 0xec907a9e
-0, 7, 7, 1, 2258, 0xc2fa9229, S=1, 1024, 0xec907a9e
-0, 8, 8, 1, 2442, 0x0d4bec48, S=1, 1024, 0xec907a9e
-0, 9, 9, 1, 2565, 0x15742730, S=1, 1024, 0xec907a9e
-0, 10, 10, 1, 2733, 0x2eb57d95, S=1, 1024, 0xec907a9e
-0, 11, 11, 1, 2849, 0x9f16ad46, S=1, 1024, 0xec907a9e
-0, 12, 12, 1, 2981, 0xf139f908, S=1, 1024, 0xec907a9e
-0, 13, 13, 1, 3082, 0x57144aec, S=1, 1024, 0xec907a9e
-0, 14, 14, 1, 3200, 0x35227f42, S=1, 1024, 0xec907a9e
-0, 15, 15, 1, 3316, 0xf6d7c002, S=1, 1024, 0xec907a9e
-0, 16, 16, 1, 3462, 0x27a20d23, S=1, 1024, 0xec907a9e
-0, 17, 17, 1, 3600, 0xaecb2b02, S=1, 1024, 0xec907a9e
-0, 18, 18, 1, 3712, 0x947d49d1, S=1, 1024, 0xec907a9e
-0, 19, 19, 1, 3838, 0xf87eb223, S=1, 1024, 0xec907a9e
-0, 20, 20, 1, 3949, 0x4152eedf, S=1, 1024, 0xec907a9e
-0, 21, 21, 1, 4084, 0x512c1e34, S=1, 1024, 0xec907a9e
-0, 22, 22, 1, 4187, 0xc5715a14, S=1, 1024, 0xec907a9e
-0, 23, 23, 1, 4323, 0x6326a0f5, S=1, 1024, 0xec907a9e
-0, 24, 24, 1, 4426, 0x5f6bd655, S=1, 1024, 0xec907a9e
-0, 25, 25, 1, 4564, 0xc62005fd, S=1, 1024, 0xec907a9e
-0, 26, 26, 1, 4664, 0x43e97006, S=1, 1024, 0xec907a9e
-0, 27, 27, 1, 4808, 0xf6e08d4f, S=1, 1024, 0xec907a9e
-0, 28, 28, 1, 4932, 0x2d51e0b5, S=1, 1024, 0xec907a9e
-0, 29, 29, 1, 5072, 0x577430c8, S=1, 1024, 0xec907a9e
-0, 30, 30, 1, 5247, 0xd9fe945d, S=1, 1024, 0xec907a9e
-0, 31, 31, 1, 5353, 0x27eec140, S=1, 1024, 0xec907a9e
-0, 32, 32, 1, 5536, 0xde59038d, S=1, 1024, 0xec907a9e
-0, 33, 33, 1, 5691, 0x358970e4, S=1, 1024, 0xec907a9e
-0, 34, 34, 1, 5835, 0xd89201d8, S=1, 1024, 0xec907a9e
-0, 35, 35, 1, 5967, 0x1c2e1fee, S=1, 1024, 0xec907a9e
-0, 36, 36, 1, 6082, 0xd4b88e90, S=1, 1024, 0xec907a9e
-0, 37, 37, 1, 6277, 0x020fe685, S=1, 1024, 0xec907a9e
-0, 38, 38, 1, 6382, 0xc1db2297, S=1, 1024, 0xec907a9e
-0, 39, 39, 1, 6509, 0xc65473a6, S=1, 1024, 0xec907a9e
-0, 40, 40, 1, 6621, 0xca917a35, S=1, 1024, 0xec907a9e
-0, 41, 41, 1, 6714, 0x70f29b1d, S=1, 1024, 0xec907a9e
-0, 42, 42, 1, 6822, 0x6f02e7ec, S=1, 1024, 0xec907a9e
-0, 43, 43, 1, 6880, 0x95440d97, S=1, 1024, 0xec907a9e
-0, 44, 44, 1, 6983, 0xab7a43fb, S=1, 1024, 0xec907a9e
-0, 45, 45, 1, 7085, 0xc3427580, S=1, 1024, 0xec907a9e
-0, 46, 46, 1, 7242, 0x3d00c5f0, S=1, 1024, 0xec907a9e
-0, 47, 47, 1, 7349, 0x453fad59, S=1, 1024, 0xec907a9e
-0, 48, 48, 1, 7514, 0xbd862667, S=1, 1024, 0xec907a9e
-0, 49, 49, 1, 7575, 0xf8cb3c77, S=1, 1024, 0xec907a9e
-0, 50, 50, 1, 7759, 0x1fe6ab40, S=1, 1024, 0xec907a9e
-0, 51, 51, 1, 7846, 0x3853fd0f, S=1, 1024, 0xec907a9e
-0, 52, 52, 1, 7975, 0x88d02c47, S=1, 1024, 0xec907a9e
-0, 53, 53, 1, 8092, 0xe28a3368, S=1, 1024, 0xec907a9e
-0, 54, 54, 1, 8188, 0x159a5d3b, S=1, 1024, 0xec907a9e
-0, 55, 55, 1, 8307, 0x598cae50, S=1, 1024, 0xec907a9e
-0, 56, 56, 1, 8436, 0xd104ee50, S=1, 1024, 0xec907a9e
-0, 57, 57, 1, 8498, 0x0b1527ed, S=1, 1024, 0xec907a9e
-0, 58, 58, 1, 8559, 0x0f722288, S=1, 1024, 0xec907a9e
-0, 59, 59, 1, 8661, 0x3efb2500, S=1, 1024, 0xec907a9e
-0, 60, 60, 1, 8774, 0x1e188a8b, S=1, 1024, 0xec907a9e
-0, 61, 61, 1, 8848, 0x5b438dbb, S=1, 1024, 0xec907a9e
-0, 62, 62, 1, 8968, 0x4b47ecb3, S=1, 1024, 0xec907a9e
-0, 63, 63, 1, 9036, 0x7a8e0791, S=1, 1024, 0xec907a9e
-0, 64, 64, 1, 9114, 0x7379131a, S=1, 1024, 0xec907a9e
-0, 65, 65, 1, 9258, 0x06099246, S=1, 1024, 0xec907a9e
-0, 66, 66, 1, 9423, 0x721ac9ab, S=1, 1024, 0xec907a9e
-0, 67, 67, 1, 9529, 0xbb1c0d18, S=1, 1024, 0xec907a9e
-0, 68, 68, 1, 9608, 0xc29a05f0, S=1, 1024, 0xec907a9e
-0, 69, 69, 1, 9668, 0xf35221ff, S=1, 1024, 0xec907a9e
-0, 70, 70, 1, 9709, 0x8c6d33f0, S=1, 1024, 0xec907a9e
-0, 71, 71, 1, 9810, 0x2d5b59f4, S=1, 1024, 0xec907a9e
-0, 72, 72, 1, 9879, 0x110ea6e5, S=1, 1024, 0xec907a9e
-0, 73, 73, 1, 10038, 0x5945f5f4, S=1, 1024, 0xec907a9e
-0, 74, 74, 1, 10120, 0xab24f519, S=1, 1024, 0xec907a9e
-0, 75, 75, 1, 10218, 0x090d305a, S=1, 1024, 0xec907a9e
-0, 76, 76, 1, 10231, 0xa77e6a66, S=1, 1024, 0xec907a9e
-0, 77, 77, 1, 10313, 0x192254b7, S=1, 1024, 0xec907a9e
-0, 78, 78, 1, 10444, 0x36609934, S=1, 1024, 0xec907a9e
-0, 79, 79, 1, 10670, 0xfa971206, S=1, 1024, 0xec907a9e
-0, 80, 80, 1, 10902, 0x01b59fd5, S=1, 1024, 0xec907a9e
-0, 81, 81, 1, 10992, 0x1f2ab0bc, S=1, 1024, 0xec907a9e
-0, 82, 82, 1, 11044, 0x7f5b1dc2, S=1, 1024, 0xec907a9e
-0, 83, 83, 1, 11170, 0x0beaee49, S=1, 1024, 0xec907a9e
-0, 84, 84, 1, 11267, 0xb1ae3808, S=1, 1024, 0xec907a9e
-0, 85, 85, 1, 11427, 0x2cc9aa3f, S=1, 1024, 0xec907a9e
-0, 86, 86, 1, 11529, 0x654de4f3, S=1, 1024, 0xec907a9e
-0, 87, 87, 1, 11632, 0xf4972bdf, S=1, 1024, 0xec907a9e
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-0, 89, 89, 1, 11864, 0x80758637, S=1, 1024, 0xec907a9e
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-0, 91, 91, 1, 12088, 0x1b99c82b, S=1, 1024, 0xec907a9e
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-0, 93, 93, 1, 12305, 0x9f62069a, S=1, 1024, 0xec907a9e
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-0, 100, 100, 1, 13184, 0xe13ad0be, S=1, 1024, 0xec907a9e
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-0, 104, 104, 1, 13728, 0x03f4d302, S=1, 1024, 0xec907a9e
-0, 105, 105, 1, 13822, 0x973b97ec, S=1, 1024, 0xec907a9e
-0, 106, 106, 1, 14002, 0x0de77dfc, S=1, 1024, 0xec907a9e
-0, 107, 107, 1, 14156, 0xf1b1d4e1, S=1, 1024, 0xec907a9e
-0, 108, 108, 1, 14256, 0x355320cc, S=1, 1024, 0xec907a9e
-0, 109, 109, 1, 14451, 0x306cb131, S=1, 1024, 0xec907a9e
-0, 110, 110, 1, 14508, 0xca729c8e, S=1, 1024, 0xec907a9e
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-0, 112, 112, 1, 14852, 0xa5b90496, S=1, 1024, 0xec907a9e
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-0, 114, 114, 1, 15225, 0xfd85f899, S=1, 1024, 0xec907a9e
-0, 115, 115, 1, 15340, 0x07411310, S=1, 1024, 0xec907a9e
-0, 116, 116, 1, 15473, 0xe90086c1, S=1, 1024, 0xec907a9e
-0, 117, 117, 1, 15583, 0x524da1f3, S=1, 1024, 0xec907a9e
-0, 118, 118, 1, 15683, 0x404cbd62, S=1, 1024, 0xec907a9e
-0, 119, 119, 1, 15779, 0x3ec01717, S=1, 1024, 0xec907a9e
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-0, 121, 121, 1, 16116, 0xb4fa83c9, S=1, 1024, 0xec907a9e
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-0, 126, 126, 1, 16710, 0x8a599742, S=1, 1024, 0xec907a9e
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-0, 129, 129, 1, 17044, 0xd57b47df, S=1, 1024, 0xec907a9e
-0, 130, 130, 1, 17153, 0xc5cf7bc7, S=1, 1024, 0xec907a9e
-0, 131, 131, 1, 17375, 0xbbeea767, S=1, 1024, 0xec907a9e
-0, 132, 132, 1, 17476, 0xd7a25686, S=1, 1024, 0xec907a9e
-0, 133, 133, 1, 17602, 0x1c99b228, S=1, 1024, 0xec907a9e
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-0, 137, 137, 1, 18201, 0xc6f1cfa7, S=1, 1024, 0xec907a9e
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-0, 139, 139, 1, 18686, 0xf65e5519, S=1, 1024, 0xec907a9e
-0, 140, 140, 1, 18790, 0x6d5c8a90, S=1, 1024, 0xec907a9e
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-0, 145, 145, 1, 19501, 0xdb80f9e9, S=1, 1024, 0xec907a9e
-0, 146, 146, 1, 19566, 0xa3952da8, S=1, 1024, 0xec907a9e
-0, 147, 147, 1, 19692, 0x65925150, S=1, 1024, 0xec907a9e
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-0, 150, 150, 1, 20136, 0x1c462eea, S=1, 1024, 0xec907a9e
-0, 151, 151, 1, 20210, 0xdec93f63, S=1, 1024, 0xec907a9e
-0, 152, 152, 1, 20311, 0xdff7836e, S=1, 1024, 0xec907a9e
-0, 153, 153, 1, 20377, 0x753d813f, S=1, 1024, 0xec907a9e
-0, 154, 154, 1, 20478, 0x7592b1a8, S=1, 1024, 0xec907a9e
-0, 155, 155, 1, 20597, 0x58313994, S=1, 1024, 0xec907a9e
-0, 156, 156, 1, 20717, 0xcdd9c665, S=1, 1024, 0xec907a9e
-0, 157, 157, 1, 20816, 0x803b4b03, S=1, 1024, 0xec907a9e
-0, 158, 158, 1, 20912, 0xce36ce22, S=1, 1024, 0xec907a9e
-0, 159, 159, 1, 20975, 0x1d08e543, S=1, 1024, 0xec907a9e
-0, 160, 160, 1, 21130, 0xc966e24c, S=1, 1024, 0xec907a9e
-0, 161, 161, 1, 21343, 0x735e614e, S=1, 1024, 0xec907a9e
-0, 162, 162, 1, 21455, 0x78d7afd1, S=1, 1024, 0xec907a9e
-0, 163, 163, 1, 21533, 0x62a10f46, S=1, 1024, 0xec907a9e
-0, 164, 164, 1, 21645, 0x8e53a12f, S=1, 1024, 0xec907a9e
-0, 165, 165, 1, 21931, 0x3b2f7226, S=1, 1024, 0xec907a9e
-0, 166, 166, 1, 22009, 0xf06bc58a, S=1, 1024, 0xec907a9e
-0, 167, 167, 1, 22115, 0xeeb1c5d7, S=1, 1024, 0xec907a9e
-0, 168, 168, 1, 22211, 0xcbab1084, S=1, 1024, 0xec907a9e
-0, 169, 169, 1, 22380, 0xf07d5cb7, S=1, 1024, 0xec907a9e
-0, 170, 170, 1, 22443, 0xcb79441c, S=1, 1024, 0xec907a9e
-0, 171, 171, 1, 22588, 0xcad49814, S=1, 1024, 0xec907a9e
-0, 172, 172, 1, 22706, 0x34924e43, S=1, 1024, 0xec907a9e
+0, 0, 0, 1, 552, 0x271a2dd3, S=1, 1024, 0xec907a9e
+0, 1, 1, 1, 297, 0x90168a95, S=1, 1024, 0xf351799f
+0, 2, 2, 1, 438, 0x91efce1b, S=1, 1024, 0xf351799f
+0, 3, 3, 1, 450, 0x7c2dcfad, S=1, 1024, 0xf351799f
+0, 4, 4, 1, 547, 0xc131fd3b, S=1, 1024, 0xf351799f
+0, 5, 5, 1, 614, 0x68182006, S=1, 1024, 0xf351799f
+0, 6, 6, 1, 642, 0x78bb1f5f, S=1, 1024, 0xf351799f
+0, 7, 7, 1, 660, 0x35c033a2, S=1, 1024, 0xf351799f
+0, 8, 8, 1, 821, 0xaf30790b, S=1, 1024, 0xf351799f
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--
2.3.0
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