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Code Issues Releases Activity

avcodec/ffv1dec: Support decoding planes as raw PCM in 1.4

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Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2013-09-09 19:56:44 +02:00
parent 77f521d9e5
commit 8393b80b7d
2 changed files with 29 additions and 9 deletions
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2
libavcodec/ffv1.h
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@ -128,6 +128,8 @@ typedef struct FFV1Context {
int slice_height;
int slice_x;
int slice_y;
int slice_reset_contexts;
int slice_coding_mode;
} FFV1Context;
int ffv1_common_init(AVCodecContext *avctx);

36
libavcodec/ffv1dec.c
View File

@ -105,6 +105,19 @@ static av_always_inline void decode_line(FFV1Context *s, int w,
int run_mode = 0;
int run_index = s->run_index;
if (s->slice_coding_mode == 1) {
int i;
for (x = 0; x < w; x++) {
int v = 0;
for (i=0; i<bits; i++) {
uint8_t state = 128;
v += v + get_rac(c, &state);
}
sample[1][x] = v;
}
return;
}
for (x = 0; x < w; x++) {
int diff, context, sign;
@ -233,10 +246,10 @@ static void decode_rgb_frame(FFV1Context *s, uint8_t *src[3], int w, int h, int
sample[p][1][-1]= sample[p][0][0 ];
sample[p][0][ w]= sample[p][0][w-1];
if (lbd)
if (lbd && s->slice_coding_mode == 0)
decode_line(s, w, sample[p], (p + 1)/2, 9);
else
decode_line(s, w, sample[p], (p + 1)/2, bits + 1);
decode_line(s, w, sample[p], (p + 1)/2, bits + (s->slice_coding_mode != 1));
}
for (x = 0; x < w; x++) {
int g = sample[0][1][x];
@ -244,11 +257,13 @@ static void decode_rgb_frame(FFV1Context *s, uint8_t *src[3], int w, int h, int
int r = sample[2][1][x];
int a = sample[3][1][x];
b -= offset;
r -= offset;
g -= (b + r) >> 2;
b += g;
r += g;
if (s->slice_coding_mode != 1) {
b -= offset;
r -= offset;
g -= (b + r) >> 2;
b += g;
r += g;
}
if (lbd)
*((uint32_t*)(src[0] + x*4 + stride[0]*y)) = b + (g<<8) + (r<<16) + (a<<24);
@ -315,7 +330,10 @@ static int decode_slice_header(FFV1Context *f, FFV1Context *fs)
}
f->cur->sample_aspect_ratio.num = get_symbol(c, state, 0);
f->cur->sample_aspect_ratio.den = get_symbol(c, state, 0);
if (fs->version > 3) {
fs->slice_reset_contexts = get_rac(c, state);
fs->slice_coding_mode = get_symbol(c, state, 0);
}
return 0;
}
@ -373,7 +391,7 @@ static int decode_slice(AVCodecContext *c, void *arg)
}
if ((ret = ffv1_init_slice_state(f, fs)) < 0)
return ret;
if (f->cur->key_frame)
if (f->cur->key_frame || fs->slice_reset_contexts)
ffv1_clear_slice_state(f, fs);
width = fs->slice_width;