static int decode_frame(AVCodecContext *avctx, void *data,
int *data_size, AVPacket *avpkt)
{
const uint8_t *buf = avpkt->data;
int buf_size = avpkt->size;
C93DecoderContext * const c93 = avctx->priv_data;
AVFrame * const newpic = &c93->pictures[c93->currentpic];
AVFrame * const oldpic = &c93->pictures[c93->currentpic^1];
AVFrame *picture = data;
GetByteContext gb;
uint8_t *out;
int stride, i, x, y, b, bt = 0;
c93->currentpic ^= 1;
newpic->reference = 3;
newpic->buffer_hints = FF_BUFFER_HINTS_VALID | FF_BUFFER_HINTS_PRESERVE |
FF_BUFFER_HINTS_REUSABLE | FF_BUFFER_HINTS_READABLE;
if (avctx->reget_buffer(avctx, newpic)) {
av_log(avctx, AV_LOG_ERROR, "reget_buffer() failed\n");
return -1;
}
stride = newpic->linesize[0];
bytestream2_init(&gb, buf, buf_size);
b = bytestream2_get_byte(&gb);
if (b & C93_FIRST_FRAME) {
newpic->pict_type = AV_PICTURE_TYPE_I;
newpic->key_frame = 1;
} else {
newpic->pict_type = AV_PICTURE_TYPE_P;
newpic->key_frame = 0;
}
for (y = 0; y < HEIGHT; y += 8) {
out = newpic->data[0] + y * stride;
for (x = 0; x < WIDTH; x += 8) {
uint8_t *copy_from = oldpic->data[0];
unsigned int offset, j;
uint8_t cols[4], grps[4];
C93BlockType block_type;
if (!bt)
bt = bytestream2_get_byte(&gb);
block_type= bt & 0x0F;
switch (block_type) {
case C93_8X8_FROM_PREV:
offset = bytestream2_get_le16(&gb);
if (copy_block(avctx, out, copy_from, offset, 8, stride))
return -1;
break;
case C93_4X4_FROM_CURR:
copy_from = newpic->data[0];
case C93_4X4_FROM_PREV:
for (j = 0; j < 8; j += 4) {
for (i = 0; i < 8; i += 4) {
offset = bytestream2_get_le16(&gb);
if (copy_block(avctx, &out[j*stride+i],
copy_from, offset, 4, stride))
return -1;
}
}
break;
case C93_8X8_2COLOR:
bytestream2_get_buffer(&gb, cols, 2);
for (i = 0; i < 8; i++) {
draw_n_color(out + i*stride, stride, 8, 1, 1, cols,
NULL, bytestream2_get_byte(&gb));
}
break;
case C93_4X4_2COLOR:
case C93_4X4_4COLOR:
case C93_4X4_4COLOR_GRP:
for (j = 0; j < 8; j += 4) {
for (i = 0; i < 8; i += 4) {
if (block_type == C93_4X4_2COLOR) {
bytestream2_get_buffer(&gb, cols, 2);
draw_n_color(out + i + j*stride, stride, 4, 4,
1, cols, NULL, bytestream2_get_le16(&gb));
} else if (block_type == C93_4X4_4COLOR) {
bytestream2_get_buffer(&gb, cols, 4);
draw_n_color(out + i + j*stride, stride, 4, 4,
2, cols, NULL, bytestream2_get_le32(&gb));
} else {
bytestream2_get_buffer(&gb, grps, 4);
draw_n_color(out + i + j*stride, stride, 4, 4,
1, cols, grps, bytestream2_get_le16(&gb));
}
}
}
break;
case C93_NOOP:
break;
case C93_8X8_INTRA:
for (j = 0; j < 8; j++)
bytestream2_get_buffer(&gb, out + j*stride, 8);
break;
default:
av_log(avctx, AV_LOG_ERROR, "unexpected type %x at %dx%d\n",
block_type, x, y);
return -1;
}
bt >>= 4;
out += 8;
}
}
if (b & C93_HAS_PALETTE) {
uint32_t *palette = (uint32_t *) newpic->data[1];
for (i = 0; i < 256; i++) {
palette[i] = 0xFFU << 24 | bytestream2_get_be24(&gb);
}
} else {
if (oldpic->data[1])
memcpy(newpic->data[1], oldpic->data[1], 256 * 4);
}
*picture = *newpic;
*data_size = sizeof(AVFrame);
return buf_size;
}
static int decode_frame(AVCodecContext *avctx, void *data,
int *got_frame, AVPacket *avpkt)
{
const uint8_t *buf = avpkt->data;
int buf_size = avpkt->size;
C93DecoderContext * const c93 = avctx->priv_data;
AVFrame * const newpic = c93->pictures[c93->currentpic];
AVFrame * const oldpic = c93->pictures[c93->currentpic^1];
GetByteContext gb;
uint8_t *out;
int stride, ret, i, x, y, b, bt = 0;
if ((ret = ff_set_dimensions(avctx, WIDTH, HEIGHT)) < 0)
return ret;
c93->currentpic ^= 1;
if ((ret = ff_reget_buffer(avctx, newpic)) < 0)
return ret;
stride = newpic->linesize[0];
bytestream2_init(&gb, buf, buf_size);
b = bytestream2_get_byte(&gb);
if (b & C93_FIRST_FRAME) {
newpic->pict_type = AV_PICTURE_TYPE_I;
newpic->key_frame = 1;
} else {
newpic->pict_type = AV_PICTURE_TYPE_P;
newpic->key_frame = 0;
}
for (y = 0; y < HEIGHT; y += 8) {
out = newpic->data[0] + y * stride;
for (x = 0; x < WIDTH; x += 8) {
uint8_t *copy_from = oldpic->data[0];
unsigned int offset, j;
uint8_t cols[4], grps[4];
C93BlockType block_type;
if (!bt)
bt = bytestream2_get_byte(&gb);
block_type= bt & 0x0F;
switch (block_type) {
case C93_8X8_FROM_PREV:
offset = bytestream2_get_le16(&gb);
if ((ret = copy_block(avctx, out, copy_from, offset, 8, stride)) < 0)
return ret;
break;
case C93_4X4_FROM_CURR:
copy_from = newpic->data[0];
case C93_4X4_FROM_PREV:
for (j = 0; j < 8; j += 4) {
for (i = 0; i < 8; i += 4) {
int offset = bytestream2_get_le16(&gb);
int from_x = offset % WIDTH;
int from_y = offset / WIDTH;
if (block_type == C93_4X4_FROM_CURR && from_y == y+j &&
(FFABS(from_x - x-i) < 4 || FFABS(from_x - x-i) > WIDTH-4)) {
avpriv_request_sample(avctx, "block overlap %d %d %d %d\n", from_x, x+i, from_y, y+j);
return AVERROR_INVALIDDATA;
}
if ((ret = copy_block(avctx, &out[j*stride+i],
copy_from, offset, 4, stride)) < 0)
return ret;
}
}
break;
case C93_8X8_2COLOR:
bytestream2_get_buffer(&gb, cols, 2);
for (i = 0; i < 8; i++) {
draw_n_color(out + i*stride, stride, 8, 1, 1, cols,
NULL, bytestream2_get_byte(&gb));
}
break;
case C93_4X4_2COLOR:
case C93_4X4_4COLOR:
case C93_4X4_4COLOR_GRP:
for (j = 0; j < 8; j += 4) {
for (i = 0; i < 8; i += 4) {
if (block_type == C93_4X4_2COLOR) {
bytestream2_get_buffer(&gb, cols, 2);
draw_n_color(out + i + j*stride, stride, 4, 4,
1, cols, NULL, bytestream2_get_le16(&gb));
} else if (block_type == C93_4X4_4COLOR) {
bytestream2_get_buffer(&gb, cols, 4);
draw_n_color(out + i + j*stride, stride, 4, 4,
2, cols, NULL, bytestream2_get_le32(&gb));
} else {
bytestream2_get_buffer(&gb, grps, 4);
draw_n_color(out + i + j*stride, stride, 4, 4,
1, cols, grps, bytestream2_get_le16(&gb));
}
}
}
break;
case C93_NOOP:
break;
case C93_8X8_INTRA:
for (j = 0; j < 8; j++)
bytestream2_get_buffer(&gb, out + j*stride, 8);
break;
default:
av_log(avctx, AV_LOG_ERROR, "unexpected type %x at %dx%d\n",
block_type, x, y);
return AVERROR_INVALIDDATA;
}
bt >>= 4;
out += 8;
}
}
if (b & C93_HAS_PALETTE) {
uint32_t *palette = (uint32_t *) newpic->data[1];
for (i = 0; i < 256; i++) {
palette[i] = 0xFFU << 24 | bytestream2_get_be24(&gb);
}
newpic->palette_has_changed = 1;
} else {
if (oldpic->data[1])
memcpy(newpic->data[1], oldpic->data[1], 256 * 4);
}
if ((ret = av_frame_ref(data, newpic)) < 0)
return ret;
*got_frame = 1;
return buf_size;
}
