static int escape124_decode_frame(AVCodecContext *avctx,
void *data, int *got_frame,
AVPacket *avpkt)
{
const uint8_t *buf = avpkt->data;
int buf_size = avpkt->size;
Escape124Context *s = avctx->priv_data;
AVFrame *frame = data;
GetBitContext gb;
unsigned frame_flags, frame_size;
unsigned i;
unsigned superblock_index, cb_index = 1,
superblock_col_index = 0,
superblocks_per_row = avctx->width / 8, skip = -1;
uint16_t* old_frame_data, *new_frame_data;
unsigned old_stride, new_stride;
int ret;
init_get_bits(&gb, buf, buf_size * 8);
// This call also guards the potential depth reads for the
// codebook unpacking.
if (!can_safely_read(&gb, 64))
return -1;
frame_flags = get_bits_long(&gb, 32);
frame_size = get_bits_long(&gb, 32);
// Leave last frame unchanged
// FIXME: Is this necessary? I haven't seen it in any real samples
if (!(frame_flags & 0x114) || !(frame_flags & 0x7800000)) {
if (!s->frame->data[0])
return AVERROR_INVALIDDATA;
av_log(NULL, AV_LOG_DEBUG, "Skipping frame\n");
*got_frame = 1;
if ((ret = av_frame_ref(frame, s->frame)) < 0)
return ret;
return frame_size;
}
for (i = 0; i < 3; i++) {
if (frame_flags & (1 << (17 + i))) {
unsigned cb_depth, cb_size;
if (i == 2) {
// This codebook can be cut off at places other than
// powers of 2, leaving some of the entries undefined.
cb_size = get_bits_long(&gb, 20);
cb_depth = av_log2(cb_size - 1) + 1;
} else {
cb_depth = get_bits(&gb, 4);
if (i == 0) {
// This is the most basic codebook: pow(2,depth) entries
// for a depth-length key
cb_size = 1 << cb_depth;
} else {
// This codebook varies per superblock
// FIXME: I don't think this handles integer overflow
// properly
cb_size = s->num_superblocks << cb_depth;
}
}
av_free(s->codebooks[i].blocks);
s->codebooks[i] = unpack_codebook(&gb, cb_depth, cb_size);
if (!s->codebooks[i].blocks)
return -1;
}
}
if ((ret = ff_get_buffer(avctx, frame, AV_GET_BUFFER_FLAG_REF)) < 0) {
av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
return ret;
}
new_frame_data = (uint16_t*)frame->data[0];
new_stride = frame->linesize[0] / 2;
old_frame_data = (uint16_t*)s->frame->data[0];
old_stride = s->frame->linesize[0] / 2;
for (superblock_index = 0; superblock_index < s->num_superblocks;
superblock_index++) {
MacroBlock mb;
SuperBlock sb;
unsigned multi_mask = 0;
if (skip == -1) {
// Note that this call will make us skip the rest of the blocks
// if the frame prematurely ends
skip = decode_skip_count(&gb);
}
if (skip) {
copy_superblock(new_frame_data, new_stride,
old_frame_data, old_stride);
} else {
copy_superblock(sb.pixels, 8,
old_frame_data, old_stride);
while (can_safely_read(&gb, 1) && !get_bits1(&gb)) {
unsigned mask;
mb = decode_macroblock(s, &gb, &cb_index, superblock_index);
mask = get_bits(&gb, 16);
multi_mask |= mask;
for (i = 0; i < 16; i++) {
if (mask & mask_matrix[i]) {
insert_mb_into_sb(&sb, mb, i);
}
}
}
if (can_safely_read(&gb, 1) && !get_bits1(&gb)) {
unsigned inv_mask = get_bits(&gb, 4);
for (i = 0; i < 4; i++) {
if (inv_mask & (1 << i)) {
multi_mask ^= 0xF << i*4;
} else {
multi_mask ^= get_bits(&gb, 4) << i*4;
}
}
for (i = 0; i < 16; i++) {
if (multi_mask & mask_matrix[i]) {
if (!can_safely_read(&gb, 1))
break;
mb = decode_macroblock(s, &gb, &cb_index,
superblock_index);
insert_mb_into_sb(&sb, mb, i);
}
}
} else if (frame_flags & (1 << 16)) {
while (can_safely_read(&gb, 1) && !get_bits1(&gb)) {
mb = decode_macroblock(s, &gb, &cb_index, superblock_index);
insert_mb_into_sb(&sb, mb, get_bits(&gb, 4));
}
}
copy_superblock(new_frame_data, new_stride, sb.pixels, 8);
}
superblock_col_index++;
new_frame_data += 8;
if (old_frame_data)
old_frame_data += 8;
if (superblock_col_index == superblocks_per_row) {
new_frame_data += new_stride * 8 - superblocks_per_row * 8;
if (old_frame_data)
old_frame_data += old_stride * 8 - superblocks_per_row * 8;
superblock_col_index = 0;
}
skip--;
}
av_log(NULL, AV_LOG_DEBUG,
"Escape sizes: %i, %i, %i\n",
frame_size, buf_size, get_bits_count(&gb) / 8);
av_frame_unref(s->frame);
if ((ret = av_frame_ref(s->frame, frame)) < 0)
return ret;
*got_frame = 1;
return frame_size;
}
static int escape130_decode_frame(AVCodecContext *avctx, void *data,
int *got_frame, AVPacket *avpkt)
{
int buf_size = avpkt->size;
Escape130Context *s = avctx->priv_data;
AVFrame *pic = data;
GetBitContext gb;
int ret;
uint8_t *old_y, *old_cb, *old_cr,
*new_y, *new_cb, *new_cr;
uint8_t *dstY, *dstU, *dstV;
unsigned old_y_stride, old_cb_stride, old_cr_stride,
new_y_stride, new_cb_stride, new_cr_stride;
unsigned total_blocks = avctx->width * avctx->height / 4,
block_index, block_x = 0;
unsigned y[4] = { 0 }, cb = 0x10, cr = 0x10;
int skip = -1, y_avg = 0, i, j;
uint8_t *ya = s->old_y_avg;
// first 16 bytes are header; no useful information in here
if (buf_size <= 16) {
av_log(avctx, AV_LOG_ERROR, "Insufficient frame data\n");
return AVERROR_INVALIDDATA;
}
if ((ret = ff_get_buffer(avctx, pic, 0)) < 0)
return ret;
if ((ret = init_get_bits8(&gb, avpkt->data, avpkt->size)) < 0)
return ret;
skip_bits_long(&gb, 16 * 8);
new_y = s->new_y;
new_cb = s->new_u;
new_cr = s->new_v;
new_y_stride = s->linesize[0];
new_cb_stride = s->linesize[1];
new_cr_stride = s->linesize[2];
old_y = s->old_y;
old_cb = s->old_u;
old_cr = s->old_v;
old_y_stride = s->linesize[0];
old_cb_stride = s->linesize[1];
old_cr_stride = s->linesize[2];
for (block_index = 0; block_index < total_blocks; block_index++) {
// Note that this call will make us skip the rest of the blocks
// if the frame ends prematurely.
if (skip == -1)
skip = decode_skip_count(&gb);
if (skip == -1) {
av_log(avctx, AV_LOG_ERROR, "Error decoding skip value\n");
return AVERROR_INVALIDDATA;
}
if (skip) {
y[0] = old_y[0];
y[1] = old_y[1];
y[2] = old_y[old_y_stride];
y[3] = old_y[old_y_stride + 1];
y_avg = ya[0];
cb = old_cb[0];
cr = old_cr[0];
} else {
if (get_bits1(&gb)) {
unsigned sign_selector = get_bits(&gb, 6);
unsigned difference_selector = get_bits(&gb, 2);
y_avg = 2 * get_bits(&gb, 5);
for (i = 0; i < 4; i++) {
y[i] = av_clip(y_avg + offset_table[difference_selector] *
sign_table[sign_selector][i], 0, 63);
}
} else if (get_bits1(&gb)) {
if (get_bits1(&gb)) {
y_avg = get_bits(&gb, 6);
} else {
unsigned adjust_index = get_bits(&gb, 3);
y_avg = (y_avg + luma_adjust[adjust_index]) & 63;
}
for (i = 0; i < 4; i++)
y[i] = y_avg;
}
if (get_bits1(&gb)) {
if (get_bits1(&gb)) {
cb = get_bits(&gb, 5);
cr = get_bits(&gb, 5);
} else {
unsigned adjust_index = get_bits(&gb, 3);
cb = (cb + chroma_adjust[0][adjust_index]) & 31;
cr = (cr + chroma_adjust[1][adjust_index]) & 31;
}
}
}
*ya++ = y_avg;
new_y[0] = y[0];
new_y[1] = y[1];
new_y[new_y_stride] = y[2];
new_y[new_y_stride + 1] = y[3];
*new_cb = cb;
*new_cr = cr;
old_y += 2;
old_cb++;
old_cr++;
new_y += 2;
new_cb++;
new_cr++;
block_x++;
if (block_x * 2 == avctx->width) {
block_x = 0;
old_y += old_y_stride * 2 - avctx->width;
old_cb += old_cb_stride - avctx->width / 2;
old_cr += old_cr_stride - avctx->width / 2;
new_y += new_y_stride * 2 - avctx->width;
new_cb += new_cb_stride - avctx->width / 2;
new_cr += new_cr_stride - avctx->width / 2;
}
skip--;
}
new_y = s->new_y;
new_cb = s->new_u;
new_cr = s->new_v;
dstY = pic->data[0];
dstU = pic->data[1];
dstV = pic->data[2];
for (j = 0; j < avctx->height; j++) {
for (i = 0; i < avctx->width; i++)
dstY[i] = new_y[i] << 2;
dstY += pic->linesize[0];
new_y += new_y_stride;
}
for (j = 0; j < avctx->height / 2; j++) {
for (i = 0; i < avctx->width / 2; i++) {
dstU[i] = chroma_vals[new_cb[i]];
dstV[i] = chroma_vals[new_cr[i]];
}
dstU += pic->linesize[1];
dstV += pic->linesize[2];
new_cb += new_cb_stride;
new_cr += new_cr_stride;
}
av_dlog(avctx, "Frame data: provided %d bytes, used %d bytes\n",
buf_size, get_bits_count(&gb) >> 3);
FFSWAP(uint8_t*, s->old_y, s->new_y);
FFSWAP(uint8_t*, s->old_u, s->new_u);
FFSWAP(uint8_t*, s->old_v, s->new_v);
*got_frame = 1;
return buf_size;
}
/**
* Decode a single frame
* @param avctx decoder context
* @param data decoded frame
* @param data_size size of the decoded frame
* @param buf input buffer
* @param buf_size input buffer size
* @return 0 success, -1 on error
*/
static int escape130_decode_frame(AVCodecContext *avctx,
void *data, int *data_size,
AVPacket *avpkt)
{
const uint8_t *buf = avpkt->data;
int buf_size = avpkt->size;
Escape130Context *s = avctx->priv_data;
GetBitContext gb;
unsigned i;
uint8_t *old_y, *old_cb, *old_cr,
*new_y, *new_cb, *new_cr;
unsigned old_y_stride, old_cb_stride, old_cr_stride,
new_y_stride, new_cb_stride, new_cr_stride;
unsigned total_blocks = avctx->width * avctx->height / 4,
block_index, row_index = 0;
unsigned y[4] = {0}, cb = 16, cr = 16;
unsigned skip = -1;
unsigned y_base = 0;
uint8_t *yb= s->bases;
AVFrame new_frame = { { 0 } };
init_get_bits(&gb, buf, buf_size * 8);
if (get_bits_left(&gb) < 128)
return -1;
// Header; no useful information in here
skip_bits_long(&gb, 128);
new_frame.reference = 3;
if (avctx->get_buffer(avctx, &new_frame)) {
av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
return -1;
}
new_y = new_frame.data[0];
new_cb = new_frame.data[1];
new_cr = new_frame.data[2];
new_y_stride = new_frame.linesize[0];
new_cb_stride = new_frame.linesize[1];
new_cr_stride = new_frame.linesize[2];
old_y = s->frame.data[0];
old_cb = s->frame.data[1];
old_cr = s->frame.data[2];
old_y_stride = s->frame.linesize[0];
old_cb_stride = s->frame.linesize[1];
old_cr_stride = s->frame.linesize[2];
av_log(avctx, AV_LOG_DEBUG,
"Strides: %i, %i\n",
new_y_stride, new_cb_stride);
for (block_index = 0; block_index < total_blocks; block_index++) {
// Note that this call will make us skip the rest of the blocks
// if the frame prematurely ends
if (skip == -1)
skip = decode_skip_count(&gb);
if (skip) {
if (old_y) {
y[0] = old_y[0] / 4;
y[1] = old_y[1] / 4;
y[2] = old_y[old_y_stride] / 4;
y[3] = old_y[old_y_stride+1] / 4;
y_base= yb[0];
cb = old_cb[0] / 8;
cr = old_cr[0] / 8;
} else {
y_base=y[0] = y[1] = y[2] = y[3] = 0;
cb = cr = 16;
}
} else {
if (get_bits1(&gb)) {
static const uint8_t offset_table[] = {2, 4, 10, 20};
static const int8_t sign_table[64][4] =
{ {0, 0, 0, 0},
{-1, 1, 0, 0},
{1, -1, 0, 0},
{-1, 0, 1, 0},
{-1, 1, 1, 0},
{0, -1, 1, 0},
{1, -1, 1, 0},
{-1, -1, 1, 0},
{1, 0, -1, 0},
{0, 1, -1, 0},
{1, 1, -1, 0},
{-1, 1, -1, 0},
{1, -1, -1, 0},
{-1, 0, 0, 1},
{-1, 1, 0, 1},
{0, -1, 0, 1},
{0, 0, 0, 0},
{1, -1, 0, 1},
{-1, -1, 0, 1},
{-1, 0, 1, 1},
{-1, 1, 1, 1},
{0, -1, 1, 1},
{1, -1, 1, 1},
{-1, -1, 1, 1},
{0, 0, -1, 1},
{1, 0, -1, 1},
{-1, 0, -1, 1},
{0, 1, -1, 1},
{1, 1, -1, 1},
{-1, 1, -1, 1},
{0, -1, -1, 1},
{1, -1, -1, 1},
{0, 0, 0, 0},
{-1, -1, -1, 1},
{1, 0, 0, -1},
{0, 1, 0, -1},
{1, 1, 0, -1},
{-1, 1, 0, -1},
{1, -1, 0, -1},
{0, 0, 1, -1},
{1, 0, 1, -1},
{-1, 0, 1, -1},
{0, 1, 1, -1},
{1, 1, 1, -1},
{-1, 1, 1, -1},
{0, -1, 1, -1},
{1, -1, 1, -1},
{-1, -1, 1, -1},
{0, 0, 0, 0},
{1, 0, -1, -1},
{0, 1, -1, -1},
{1, 1, -1, -1},
{-1, 1, -1, -1},
{1, -1, -1, -1} };
unsigned sign_selector = get_bits(&gb, 6);
unsigned difference_selector = get_bits(&gb, 2);
y_base = 2 * get_bits(&gb, 5);
for (i = 0; i < 4; i++) {
y[i] = av_clip((int)y_base + offset_table[difference_selector] *
sign_table[sign_selector][i], 0, 63);
}
} else if (get_bits1(&gb)) {
if (get_bits1(&gb)) {
y_base = get_bits(&gb, 6);
} else {
unsigned adjust_index = get_bits(&gb, 3);
static const int8_t adjust[] = {-4, -3, -2, -1, 1, 2, 3, 4};
y_base = (y_base + adjust[adjust_index]) & 63;
}
for (i = 0; i < 4; i++)
y[i] = y_base;
}
if (get_bits1(&gb)) {
if (get_bits1(&gb)) {
cb = get_bits(&gb, 5);
cr = get_bits(&gb, 5);
} else {
unsigned adjust_index = get_bits(&gb, 3);
static const int8_t adjust[2][8] =
{ { 1, 1, 0, -1, -1, -1, 0, 1 },
{ 0, 1, 1, 1, 0, -1, -1, -1 } };
cb = (cb + adjust[0][adjust_index]) & 31;
cr = (cr + adjust[1][adjust_index]) & 31;
}
}
}
*yb++= y_base;
new_y[0] = y[0] * 4;
new_y[1] = y[1] * 4;
new_y[new_y_stride] = y[2] * 4;
new_y[new_y_stride + 1] = y[3] * 4;
*new_cb = cb * 8;
*new_cr = cr * 8;
if (old_y)
old_y += 2, old_cb++, old_cr++;
new_y += 2, new_cb++, new_cr++;
row_index++;
if (avctx->width / 2 == row_index) {
row_index = 0;
if (old_y) {
old_y += old_y_stride * 2 - avctx->width;
old_cb += old_cb_stride - avctx->width / 2;
old_cr += old_cr_stride - avctx->width / 2;
}
new_y += new_y_stride * 2 - avctx->width;
new_cb += new_cb_stride - avctx->width / 2;
new_cr += new_cr_stride - avctx->width / 2;
}
skip--;
}
av_log(avctx, AV_LOG_DEBUG,
"Escape sizes: %i, %i\n",
buf_size, get_bits_count(&gb) / 8);
if (s->frame.data[0])
avctx->release_buffer(avctx, &s->frame);
*(AVFrame*)data = s->frame = new_frame;
*data_size = sizeof(AVFrame);
return buf_size;
}