generic-library/ffmpeg
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

theora: Add support for 4:2:2 and 4:4:4 subsampling

Browse Source 
Originally committed as revision 22500 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
David Conrad 2010-03-13 05:59:22 +00:00
parent 1a8560423e
commit 1e76a1da05
1 changed files with 92 additions and 37 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

129
libavcodec/vp3.c
View File

@ -130,6 +130,7 @@ typedef struct Vp3DecodeContext {
int theora, theora_tables;
int version;
int width, height;
int chroma_x_shift, chroma_y_shift;
AVFrame golden_frame;
AVFrame last_frame;
AVFrame current_frame;
@ -516,6 +517,7 @@ static int unpack_modes(Vp3DecodeContext *s, GetBitContext *gb)
int coding_mode;
int custom_mode_alphabet[CODING_MODE_COUNT];
const int *alphabet;
Vp3Fragment *frag;
if (s->keyframe) {
for (i = 0; i < s->fragment_count; i++)
@ -572,20 +574,31 @@ static int unpack_modes(Vp3DecodeContext *s, GetBitContext *gb)
s->macroblock_coding[current_macroblock] = coding_mode;
for (k = 0; k < 4; k++) {
current_fragment =
BLOCK_Y*s->fragment_width[0] + BLOCK_X;
if (s->all_fragments[current_fragment].coding_method !=
MODE_COPY)
s->all_fragments[current_fragment].coding_method =
coding_mode;
frag = s->all_fragments + BLOCK_Y*s->fragment_width[0] + BLOCK_X;
if (frag->coding_method != MODE_COPY)
frag->coding_method = coding_mode;
}
for (k = 0; k < 2; k++) {
current_fragment = s->fragment_start[k+1] +
mb_y*s->fragment_width[1] + mb_x;
if (s->all_fragments[current_fragment].coding_method !=
MODE_COPY)
s->all_fragments[current_fragment].coding_method =
coding_mode;
#define SET_CHROMA_MODES \
if (frag[s->fragment_start[1]].coding_method != MODE_COPY) \
frag[s->fragment_start[1]].coding_method = coding_mode;\
if (frag[s->fragment_start[2]].coding_method != MODE_COPY) \
frag[s->fragment_start[2]].coding_method = coding_mode;
if (s->chroma_y_shift) {
frag = s->all_fragments + mb_y*s->fragment_width[1] + mb_x;
SET_CHROMA_MODES
} else if (s->chroma_x_shift) {
frag = s->all_fragments + 2*mb_y*s->fragment_width[1] + mb_x;
for (k = 0; k < 2; k++) {
SET_CHROMA_MODES
frag += s->fragment_width[1];
}
} else {
for (k = 0; k < 4; k++) {
frag = s->all_fragments + BLOCK_Y*s->fragment_width[1] + BLOCK_X;
SET_CHROMA_MODES
}
}
}
}
@ -611,6 +624,7 @@ static int unpack_vectors(Vp3DecodeContext *s, GetBitContext *gb)
int prior_last_motion_y = 0;
int current_macroblock;
int current_fragment;
Vp3Fragment *frag;
if (s->keyframe)
return 0;
@ -724,15 +738,49 @@ static int unpack_vectors(Vp3DecodeContext *s, GetBitContext *gb)
s->all_fragments[current_fragment].motion_y = motion_y[0];
}
}
#define SET_CHROMA_MV(mx, my) \
frag[s->fragment_start[1]].motion_x = mx; \
frag[s->fragment_start[1]].motion_y = my; \
frag[s->fragment_start[2]].motion_x = mx; \
frag[s->fragment_start[2]].motion_y = my
if (s->chroma_y_shift) {
if (s->macroblock_coding[current_macroblock] == MODE_INTER_FOURMV) {
motion_x[0] = RSHIFT(motion_x[0] + motion_x[1] + motion_x[2] + motion_x[3], 2);
motion_y[0] = RSHIFT(motion_y[0] + motion_y[1] + motion_y[2] + motion_y[3], 2);
}
for (k = 0; k < 2; k++) {
current_fragment = s->fragment_start[k+1] +
mb_y*s->fragment_width[1] + mb_x;
s->all_fragments[current_fragment].motion_x = motion_x[0];
s->all_fragments[current_fragment].motion_y = motion_y[0];
motion_x[0] = (motion_x[0]>>1) | (motion_x[0]&1);
motion_y[0] = (motion_y[0]>>1) | (motion_y[0]&1);
frag = s->all_fragments + mb_y*s->fragment_width[1] + mb_x;
SET_CHROMA_MV(motion_x[0], motion_y[0]);
} else if (s->chroma_x_shift) {
if (s->macroblock_coding[current_macroblock] == MODE_INTER_FOURMV) {
motion_x[0] = RSHIFT(motion_x[0] + motion_x[1], 1);
motion_y[0] = RSHIFT(motion_y[0] + motion_y[1], 1);
motion_x[1] = RSHIFT(motion_x[2] + motion_x[3], 1);
motion_y[1] = RSHIFT(motion_y[2] + motion_y[3], 1);
} else {
motion_x[1] = motion_x[0];
motion_y[1] = motion_y[0];
}
motion_x[0] = (motion_x[0]>>1) | (motion_x[0]&1);
motion_x[1] = (motion_x[1]>>1) | (motion_x[1]&1);
frag = s->all_fragments + 2*mb_y*s->fragment_width[1] + mb_x;
for (k = 0; k < 2; k++) {
SET_CHROMA_MV(motion_x[k], motion_y[k]);
frag += s->fragment_width[1];
}
} else {
for (k = 0; k < 4; k++) {
frag = s->all_fragments + BLOCK_Y*s->fragment_width[1] + BLOCK_X;
if (s->macroblock_coding[current_macroblock] == MODE_INTER_FOURMV) {
SET_CHROMA_MV(motion_x[k], motion_y[k]);
} else {
SET_CHROMA_MV(motion_x[0], motion_y[0]);
}
}
}
}
}
@ -1304,11 +1352,11 @@ static void render_slice(Vp3DecodeContext *s, int slice)
uint8_t * last_plane = s-> last_frame.data [plane] + s->data_offset[plane];
uint8_t *golden_plane = s-> golden_frame.data [plane] + s->data_offset[plane];
int stride = s->current_frame.linesize[plane];
int plane_width = s->width >> !!plane;
int plane_height = s->height >> !!plane;
int plane_width = s->width >> (plane && s->chroma_x_shift);
int plane_height = s->height >> (plane && s->chroma_y_shift);
int sb_x, sb_y = slice << !plane;
int slice_height = sb_y + (plane ? 1 : 2);
int sb_x, sb_y = slice << (!plane && s->chroma_y_shift);
int slice_height = sb_y + 1 + (!plane && s->chroma_y_shift);
int slice_width = plane ? s->c_superblock_width : s->y_superblock_width;
int fragment_width = s->fragment_width[!!plane];
@ -1362,10 +1410,6 @@ static void render_slice(Vp3DecodeContext *s, int slice)
int src_x, src_y;
motion_x = s->all_fragments[i].motion_x;
motion_y = s->all_fragments[i].motion_y;
if(plane){
motion_x= (motion_x>>1) | (motion_x&1);
motion_y= (motion_y>>1) | (motion_y&1);
}
src_x= (motion_x>>1) + 8*x;
src_y= (motion_y>>1) + 8*y;
@ -1463,6 +1507,7 @@ static av_cold int vp3_decode_init(AVCodecContext *avctx)
int i, inter, plane;
int c_width;
int c_height;
int y_fragment_count, c_fragment_count;
if (avctx->codec_tag == MKTAG('V','P','3','0'))
s->version = 0;
@ -1472,7 +1517,8 @@ static av_cold int vp3_decode_init(AVCodecContext *avctx)
s->avctx = avctx;
s->width = FFALIGN(avctx->width, 16);
s->height = FFALIGN(avctx->height, 16);
avctx->pix_fmt = PIX_FMT_YUV420P;
if (avctx->pix_fmt == PIX_FMT_NONE)
avctx->pix_fmt = PIX_FMT_YUV420P;
avctx->chroma_sample_location = AVCHROMA_LOC_CENTER;
if(avctx->idct_algo==FF_IDCT_AUTO)
avctx->idct_algo=FF_IDCT_VP3;
@ -1485,13 +1531,15 @@ static av_cold int vp3_decode_init(AVCodecContext *avctx)
for (i = 0; i < 3; i++)
s->qps[i] = -1;
avcodec_get_chroma_sub_sample(avctx->pix_fmt, &s->chroma_x_shift, &s->chroma_y_shift);
s->y_superblock_width = (s->width + 31) / 32;
s->y_superblock_height = (s->height + 31) / 32;
s->y_superblock_count = s->y_superblock_width * s->y_superblock_height;
/* work out the dimensions for the C planes */
c_width = s->width / 2;
c_height = s->height / 2;
c_width = s->width >> s->chroma_x_shift;
c_height = s->height >> s->chroma_y_shift;
s->c_superblock_width = (c_width + 31) / 32;
s->c_superblock_height = (c_height + 31) / 32;
s->c_superblock_count = s->c_superblock_width * s->c_superblock_height;
@ -1507,13 +1555,15 @@ static av_cold int vp3_decode_init(AVCodecContext *avctx)
s->fragment_width[0] = s->width / FRAGMENT_PIXELS;
s->fragment_height[0] = s->height / FRAGMENT_PIXELS;
s->fragment_width[1] = s->fragment_width[0] >> 1;
s->fragment_height[1] = s->fragment_height[0] >> 1;
s->fragment_width[1] = s->fragment_width[0] >> s->chroma_x_shift;
s->fragment_height[1] = s->fragment_height[0] >> s->chroma_y_shift;
/* fragment count covers all 8x8 blocks for all 3 planes */
s->fragment_count = s->fragment_width[0] * s->fragment_height[0] * 3 / 2;
s->fragment_start[1] = s->fragment_width[0] * s->fragment_height[0];
s->fragment_start[2] = s->fragment_width[0] * s->fragment_height[0] * 5 / 4;
y_fragment_count = s->fragment_width[0] * s->fragment_height[0];
c_fragment_count = s->fragment_width[1] * s->fragment_height[1];
s->fragment_count = y_fragment_count + 2*c_fragment_count;
s->fragment_start[1] = y_fragment_count;
s->fragment_start[2] = y_fragment_count + c_fragment_count;
s->all_fragments = av_malloc(s->fragment_count * sizeof(Vp3Fragment));
s->coded_fragment_list[0] = av_malloc(s->fragment_count * sizeof(int));
@ -1764,10 +1814,11 @@ static int vp3_decode_frame(AVCodecContext *avctx,
}
for (i = 0; i < 3; i++) {
int height = s->height >> (i && s->chroma_y_shift);
if (s->flipped_image)
s->data_offset[i] = 0;
else
s->data_offset[i] = ((s->height>>!!i)-1) * s->current_frame.linesize[i];
s->data_offset[i] = (height-1) * s->current_frame.linesize[i];
}
s->last_slice_end = 0;
@ -1776,7 +1827,7 @@ static int vp3_decode_frame(AVCodecContext *avctx,
// filter the last row
for (i = 0; i < 3; i++) {
int row = (s->height >> (3+!!i)) - 1;
int row = (s->height >> (3+(i && s->chroma_y_shift))) - 1;
apply_loop_filter(s, i, row, row+1);
}
vp3_draw_horiz_band(s, s->height);
@ -1883,6 +1934,10 @@ static int read_huffman_tree(AVCodecContext *avctx, GetBitContext *gb)
}
#if CONFIG_THEORA_DECODER
static const enum PixelFormat theora_pix_fmts[4] = {
PIX_FMT_YUV420P, PIX_FMT_NONE, PIX_FMT_YUV422P, PIX_FMT_YUV444P
};
static int theora_decode_header(AVCodecContext *avctx, GetBitContext *gb)
{
Vp3DecodeContext *s = avctx->priv_data;
@ -1931,7 +1986,7 @@ static int theora_decode_header(AVCodecContext *avctx, GetBitContext *gb)
if (s->theora >= 0x030200)
{
skip_bits(gb, 5); /* keyframe frequency force */
skip_bits(gb, 2); /* pixel format: 420,res,422,444 */
avctx->pix_fmt = theora_pix_fmts[get_bits(gb, 2)];
skip_bits(gb, 3); /* reserved */
}