Chiebot-Mirror
/
FFmpeg
mirror of https://github.com/FFmpeg/FFmpeg.git
8
0
Fork 0
Code Issues Projects Releases Wiki Activity

proresdec2: Support decoding transparency information.

Browse Source 
Signed-off-by: Carl Eugen Hoyos <cehoyos@ag.or.at>
pull/18/head
Kostya Shishkov 12 years ago committed by Carl Eugen Hoyos
parent 7e570f027b
commit d13fa0e995
2 changed files with 101 additions and 4 deletions
Whitespace
Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL
Split View
Diff Options
Show Stats Download Patch File Download Diff File
  1. 1
      libavcodec/proresdec.h
  2. 102
      libavcodec/proresdec2.c

1
libavcodec/proresdec.h
Unescape View File

@ -49,6 +49,7 @@ typedef struct {
uint8_t interlaced_scan[64];
const uint8_t *scan;
int first_field;
int alpha_info;
} ProresContext;
#endif /* AVCODEC_PRORESDEC_H */

102
libavcodec/proresdec2.c
Unescape View File

@ -112,6 +112,12 @@ static int decode_frame_header(ProresContext *ctx, const uint8_t *buf,
}
ctx->frame_type = (buf[12] >> 2) & 3;
ctx->alpha_info = buf[17] & 0xf;
if (ctx->alpha_info > 2) {
av_log(avctx, AV_LOG_ERROR, "Invalid alpha mode %d\n", ctx->alpha_info);
return AVERROR_INVALIDDATA;
}
av_dlog(avctx, "frame type %d\n", ctx->frame_type);
@ -123,7 +129,11 @@ static int decode_frame_header(ProresContext *ctx, const uint8_t *buf,
ctx->frame->top_field_first = ctx->frame_type == 1;
}
if (ctx->alpha_info) {
avctx->pix_fmt = (buf[12] & 0xC0) == 0xC0 ? AV_PIX_FMT_YUVA444P10 : AV_PIX_FMT_YUVA422P10;
} else {
avctx->pix_fmt = (buf[12] & 0xC0) == 0xC0 ? AV_PIX_FMT_YUV444P10 : AV_PIX_FMT_YUV422P10;
}
ptr = buf + 20;
flags = buf[19];
@ -422,6 +432,83 @@ static void decode_slice_chroma(AVCodecContext *avctx, SliceContext *slice,
}
}
static void unpack_alpha(GetBitContext *gb, uint16_t *dst, int num_coeffs,
const int num_bits)
{
const int mask = (1 << num_bits) - 1;
int i, idx, val, alpha_val;
idx = 0;
alpha_val = mask;
do {
do {
if (get_bits1(gb)) {
val = get_bits(gb, num_bits);
} else {
int sign;
val = get_bits(gb, num_bits == 16 ? 7 : 4);
sign = val & 1;
val = (val + 2) >> 1;
if (sign)
val = -val;
}
alpha_val = (alpha_val + val) & mask;
if (num_bits == 16) {
dst[idx++] = alpha_val >> 6;
} else {
dst[idx++] = (alpha_val << 2) | (alpha_val >> 6);
}
if (idx == num_coeffs - 1)
break;
} while (get_bits_left(gb)>0 && get_bits1(gb));
val = get_bits(gb, 4);
if (!val)
val = get_bits(gb, 11);
if (idx + val > num_coeffs)
val = num_coeffs - idx;
if (num_bits == 16) {
for (i = 0; i < val; i++)
dst[idx++] = alpha_val >> 6;
} else {
for (i = 0; i < val; i++)
dst[idx++] = (alpha_val << 2) | (alpha_val >> 6);
}
} while (idx < num_coeffs);
}
/**
* Decode alpha slice plane.
*/
static void decode_slice_alpha(ProresContext *ctx,
uint16_t *dst, int dst_stride,
const uint8_t *buf, int buf_size,
int blocks_per_slice)
{
GetBitContext gb;
int i;
LOCAL_ALIGNED_16(int16_t, blocks, [8*4*64]);
int16_t *block;
for (i = 0; i < blocks_per_slice<<2; i++)
ctx->dsp.clear_block(blocks+(i<<6));
init_get_bits(&gb, buf, buf_size << 3);
if (ctx->alpha_info == 2) {
unpack_alpha(&gb, blocks, blocks_per_slice * 4 * 64, 16);
} else {
unpack_alpha(&gb, blocks, blocks_per_slice * 4 * 64, 8);
}
block = blocks;
for (i = 0; i < 16; i++) {
memcpy(dst, block, 16 * blocks_per_slice * sizeof(*dst));
dst += dst_stride >> 1;
block += 16 * blocks_per_slice;
}
}
static int decode_slice_thread(AVCodecContext *avctx, void *arg, int jobnr, int threadnr)
{
ProresContext *ctx = avctx->priv_data;
@ -430,8 +517,8 @@ static int decode_slice_thread(AVCodecContext *avctx, void *arg, int jobnr, int
AVFrame *pic = ctx->frame;
int i, hdr_size, qscale, log2_chroma_blocks_per_mb;
int luma_stride, chroma_stride;
int y_data_size, u_data_size, v_data_size;
uint8_t *dest_y, *dest_u, *dest_v;
int y_data_size, u_data_size, v_data_size, a_data_size;
uint8_t *dest_y, *dest_u, *dest_v, *dest_a;
int16_t qmat_luma_scaled[64];
int16_t qmat_chroma_scaled[64];
int mb_x_shift;
@ -448,6 +535,8 @@ static int decode_slice_thread(AVCodecContext *avctx, void *arg, int jobnr, int
u_data_size = AV_RB16(buf + 4);
v_data_size = slice->data_size - y_data_size - u_data_size - hdr_size;
if (hdr_size > 7) v_data_size = AV_RB16(buf + 6);
a_data_size = slice->data_size - y_data_size - u_data_size -
v_data_size - hdr_size;
if (y_data_size < 0 || u_data_size < 0 || v_data_size < 0
|| hdr_size+y_data_size+u_data_size+v_data_size > slice->data_size){
@ -470,7 +559,7 @@ static int decode_slice_thread(AVCodecContext *avctx, void *arg, int jobnr, int
chroma_stride = pic->linesize[1] << 1;
}
if (avctx->pix_fmt == AV_PIX_FMT_YUV444P10) {
if (avctx->pix_fmt == AV_PIX_FMT_YUV444P10 || avctx->pix_fmt == AV_PIX_FMT_YUVA444P10) {
mb_x_shift = 5;
log2_chroma_blocks_per_mb = 2;
} else {
@ -481,11 +570,13 @@ static int decode_slice_thread(AVCodecContext *avctx, void *arg, int jobnr, int
dest_y = pic->data[0] + (slice->mb_y << 4) * luma_stride + (slice->mb_x << 5);
dest_u = pic->data[1] + (slice->mb_y << 4) * chroma_stride + (slice->mb_x << mb_x_shift);
dest_v = pic->data[2] + (slice->mb_y << 4) * chroma_stride + (slice->mb_x << mb_x_shift);
dest_a = pic->data[3] + (slice->mb_y << 4) * luma_stride + (slice->mb_x << 5);
if (ctx->frame_type && ctx->first_field ^ ctx->frame->top_field_first) {
dest_y += pic->linesize[0];
dest_u += pic->linesize[1];
dest_v += pic->linesize[2];
dest_a += pic->linesize[3];
}
decode_slice_luma(avctx, slice, (uint16_t*)dest_y, luma_stride,
@ -499,6 +590,11 @@ static int decode_slice_thread(AVCodecContext *avctx, void *arg, int jobnr, int
buf + y_data_size + u_data_size, v_data_size,
qmat_chroma_scaled, log2_chroma_blocks_per_mb);
}
/* decode alpha plane if available */
if (ctx->alpha_info && dest_a && a_data_size)
decode_slice_alpha(ctx, (uint16_t*)dest_a, luma_stride,
buf + y_data_size + u_data_size + v_data_size,
a_data_size, slice->mb_count);
slice->ret = 0;
return 0;

Write Preview
Loading…
Cancel
Save