本文整理汇总了C++中VP56Context类的典型用法代码示例。如果您正苦于以下问题：C++ VP56Context类的具体用法？C++ VP56Context怎么用？C++ VP56Context使用的例子？那么恭喜您, 这里精选的类代码示例或许可以为您提供帮助。
在下文中一共展示了VP56Context类的4个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的C++代码示例。
示例1: ff_vp56_decode_frame
int ff_vp56_decode_frame(AVCodecContext *avctx, void *data, int *data_size,
AVPacket *avpkt)
{
const uint8_t *buf = avpkt->data;
VP56Context *s = avctx->priv_data;
AVFrame *const p = s->framep[VP56_FRAME_CURRENT];
int remaining_buf_size = avpkt->size;
int is_alpha, av_uninit(alpha_offset);
if (s->has_alpha) {
if (remaining_buf_size < 3)
return -1;
alpha_offset = bytestream_get_be24(&buf);
remaining_buf_size -= 3;
if (remaining_buf_size < alpha_offset)
return -1;
}
for (is_alpha=0; is_alpha < 1+s->has_alpha; is_alpha++) {
int mb_row, mb_col, mb_row_flip, mb_offset = 0;
int block, y, uv, stride_y, stride_uv;
int golden_frame = 0;
int res;
s->modelp = &s->models[is_alpha];
res = s->parse_header(s, buf, remaining_buf_size, &golden_frame);
if (!res)
return -1;
if (!is_alpha) {
p->reference = 1;
if (avctx->get_buffer(avctx, p) < 0) {
av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
return -1;
}
if (res == 2)
if (vp56_size_changed(avctx)) {
avctx->release_buffer(avctx, p);
return -1;
}
}
if (p->key_frame) {
p->pict_type = AV_PICTURE_TYPE_I;
s->default_models_init(s);
for (block=0; block<s->mb_height*s->mb_width; block++)
s->macroblocks[block].type = VP56_MB_INTRA;
} else {
p->pict_type = AV_PICTURE_TYPE_P;
vp56_parse_mb_type_models(s);
s->parse_vector_models(s);
s->mb_type = VP56_MB_INTER_NOVEC_PF;
}
s->parse_coeff_models(s);
memset(s->prev_dc, 0, sizeof(s->prev_dc));
s->prev_dc[1][VP56_FRAME_CURRENT] = 128;
s->prev_dc[2][VP56_FRAME_CURRENT] = 128;
for (block=0; block < 4*s->mb_width+6; block++) {
s->above_blocks[block].ref_frame = VP56_FRAME_NONE;
s->above_blocks[block].dc_coeff = 0;
s->above_blocks[block].not_null_dc = 0;
}
s->above_blocks[2*s->mb_width + 2].ref_frame = VP56_FRAME_CURRENT;
s->above_blocks[3*s->mb_width + 4].ref_frame = VP56_FRAME_CURRENT;
stride_y = p->linesize[0];
stride_uv = p->linesize[1];
if (s->flip < 0)
mb_offset = 7;
/* main macroblocks loop */
for (mb_row=0; mb_row<s->mb_height; mb_row++) {
if (s->flip < 0)
mb_row_flip = s->mb_height - mb_row - 1;
else
mb_row_flip = mb_row;
for (block=0; block<4; block++) {
s->left_block[block].ref_frame = VP56_FRAME_NONE;
s->left_block[block].dc_coeff = 0;
s->left_block[block].not_null_dc = 0;
}
memset(s->coeff_ctx, 0, sizeof(s->coeff_ctx));
memset(s->coeff_ctx_last, 24, sizeof(s->coeff_ctx_last));
s->above_block_idx[0] = 1;
s->above_block_idx[1] = 2;
s->above_block_idx[2] = 1;
s->above_block_idx[3] = 2;
s->above_block_idx[4] = 2*s->mb_width + 2 + 1;
s->above_block_idx[5] = 3*s->mb_width + 4 + 1;
s->block_offset[s->frbi] = (mb_row_flip*16 + mb_offset) * stride_y;
s->block_offset[s->srbi] = s->block_offset[s->frbi] + 8*stride_y;
//.........这里部分代码省略.........
示例2: ff_vp56_decode_frame
int ff_vp56_decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
AVPacket *avpkt)
{
const uint8_t *buf = avpkt->data;
VP56Context *s = avctx->priv_data;
AVFrame *const p = s->frames[VP56_FRAME_CURRENT];
int remaining_buf_size = avpkt->size;
int av_uninit(alpha_offset);
int i, res;
int ret;
if (s->has_alpha) {
if (remaining_buf_size < 3)
return -1;
alpha_offset = bytestream_get_be24(&buf);
remaining_buf_size -= 3;
if (remaining_buf_size < alpha_offset)
return -1;
}
res = s->parse_header(s, buf, remaining_buf_size);
if (res < 0)
return res;
if (res == VP56_SIZE_CHANGE) {
for (i = 0; i < 4; i++) {
av_frame_unref(s->frames[i]);
if (s->alpha_context)
av_frame_unref(s->alpha_context->frames[i]);
}
}
if (ff_get_buffer(avctx, p, AV_GET_BUFFER_FLAG_REF) < 0)
return -1;
if (avctx->pix_fmt == AV_PIX_FMT_YUVA420P) {
av_frame_unref(s->alpha_context->frames[VP56_FRAME_CURRENT]);
if ((ret = av_frame_ref(s->alpha_context->frames[VP56_FRAME_CURRENT], p)) < 0) {
av_frame_unref(p);
return ret;
}
}
if (res == VP56_SIZE_CHANGE) {
if (vp56_size_changed(s)) {
av_frame_unref(p);
return -1;
}
}
if (avctx->pix_fmt == AV_PIX_FMT_YUVA420P) {
int bak_w = avctx->width;
int bak_h = avctx->height;
int bak_cw = avctx->coded_width;
int bak_ch = avctx->coded_height;
buf += alpha_offset;
remaining_buf_size -= alpha_offset;
res = s->alpha_context->parse_header(s->alpha_context, buf, remaining_buf_size);
if (res != 0) {
if(res==VP56_SIZE_CHANGE) {
av_log(avctx, AV_LOG_ERROR, "Alpha reconfiguration\n");
avctx->width = bak_w;
avctx->height = bak_h;
avctx->coded_width = bak_cw;
avctx->coded_height = bak_ch;
}
av_frame_unref(p);
return -1;
}
}
avctx->execute2(avctx, ff_vp56_decode_mbs, 0, 0, (avctx->pix_fmt == AV_PIX_FMT_YUVA420P) + 1);
if ((res = av_frame_ref(data, p)) < 0)
return res;
*got_frame = 1;
return avpkt->size;
}示例3: ff_vp56_decode_mbs
static int ff_vp56_decode_mbs(AVCodecContext *avctx, void *data,
int jobnr, int threadnr)
{
VP56Context *s0 = avctx->priv_data;
int is_alpha = (jobnr == 1);
VP56Context *s = is_alpha ? s0->alpha_context : s0;
AVFrame *const p = s->frames[VP56_FRAME_CURRENT];
int mb_row, mb_col, mb_row_flip, mb_offset = 0;
int block, y, uv;
ptrdiff_t stride_y, stride_uv;
int res;
if (p->key_frame) {
p->pict_type = AV_PICTURE_TYPE_I;
s->default_models_init(s);
for (block=0; block<s->mb_height*s->mb_width; block++)
s->macroblocks[block].type = VP56_MB_INTRA;
} else {
p->pict_type = AV_PICTURE_TYPE_P;
vp56_parse_mb_type_models(s);
s->parse_vector_models(s);
s->mb_type = VP56_MB_INTER_NOVEC_PF;
}
if (s->parse_coeff_models(s))
goto next;
memset(s->prev_dc, 0, sizeof(s->prev_dc));
s->prev_dc[1][VP56_FRAME_CURRENT] = 128;
s->prev_dc[2][VP56_FRAME_CURRENT] = 128;
for (block=0; block < 4*s->mb_width+6; block++) {
s->above_blocks[block].ref_frame = VP56_FRAME_NONE;
s->above_blocks[block].dc_coeff = 0;
s->above_blocks[block].not_null_dc = 0;
}
s->above_blocks[2*s->mb_width + 2].ref_frame = VP56_FRAME_CURRENT;
s->above_blocks[3*s->mb_width + 4].ref_frame = VP56_FRAME_CURRENT;
stride_y = p->linesize[0];
stride_uv = p->linesize[1];
if (s->flip < 0)
mb_offset = 7;
/* main macroblocks loop */
for (mb_row=0; mb_row<s->mb_height; mb_row++) {
if (s->flip < 0)
mb_row_flip = s->mb_height - mb_row - 1;
else
mb_row_flip = mb_row;
for (block=0; block<4; block++) {
s->left_block[block].ref_frame = VP56_FRAME_NONE;
s->left_block[block].dc_coeff = 0;
s->left_block[block].not_null_dc = 0;
}
memset(s->coeff_ctx, 0, sizeof(s->coeff_ctx));
memset(s->coeff_ctx_last, 24, sizeof(s->coeff_ctx_last));
s->above_block_idx[0] = 1;
s->above_block_idx[1] = 2;
s->above_block_idx[2] = 1;
s->above_block_idx[3] = 2;
s->above_block_idx[4] = 2*s->mb_width + 2 + 1;
s->above_block_idx[5] = 3*s->mb_width + 4 + 1;
s->block_offset[s->frbi] = (mb_row_flip*16 + mb_offset) * stride_y;
s->block_offset[s->srbi] = s->block_offset[s->frbi] + 8*stride_y;
s->block_offset[1] = s->block_offset[0] + 8;
s->block_offset[3] = s->block_offset[2] + 8;
s->block_offset[4] = (mb_row_flip*8 + mb_offset) * stride_uv;
s->block_offset[5] = s->block_offset[4];
for (mb_col=0; mb_col<s->mb_width; mb_col++) {
vp56_decode_mb(s, mb_row, mb_col, is_alpha);
for (y=0; y<4; y++) {
s->above_block_idx[y] += 2;
s->block_offset[y] += 16;
}
for (uv=4; uv<6; uv++) {
s->above_block_idx[uv] += 1;
s->block_offset[uv] += 8;
}
}
}
next:
if (p->key_frame || s->golden_frame) {
av_frame_unref(s->frames[VP56_FRAME_GOLDEN]);
if ((res = av_frame_ref(s->frames[VP56_FRAME_GOLDEN], p)) < 0)
return res;
}
av_frame_unref(s->frames[VP56_FRAME_PREVIOUS]);
FFSWAP(AVFrame *, s->frames[VP56_FRAME_CURRENT],
s->frames[VP56_FRAME_PREVIOUS]);
return 0;
//.........这里部分代码省略.........
示例4: ff_vp56_decode_frame
int ff_vp56_decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
AVPacket *avpkt)
{
const uint8_t *buf = avpkt->data;
VP56Context *s = avctx->priv_data;
AVFrame *p = 0;
int remaining_buf_size = avpkt->size;
int av_uninit(alpha_offset);
int i, res;
/* select a current frame from the unused frames */
for (i = 0; i < 4; ++i) {
if (!s->frames[i].data[0]) {
p = &s->frames[i];
break;
}
}
av_assert0(p != 0);
s->framep[VP56_FRAME_CURRENT] = p;
if (s->alpha_context)
s->alpha_context->framep[VP56_FRAME_CURRENT] = p;
if (s->has_alpha) {
if (remaining_buf_size < 3)
return -1;
alpha_offset = bytestream_get_be24(&buf);
remaining_buf_size -= 3;
if (remaining_buf_size < alpha_offset)
return -1;
}
res = s->parse_header(s, buf, remaining_buf_size);
if (res < 0)
return res;
if (res == VP56_SIZE_CHANGE) {
for (i = 0; i < 4; i++) {
if (s->frames[i].data[0])
avctx->release_buffer(avctx, &s->frames[i]);
}
}
p->reference = 3;
if (ff_get_buffer(avctx, p) < 0) {
av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
return -1;
}
if (res == VP56_SIZE_CHANGE) {
if (vp56_size_changed(s)) {
avctx->release_buffer(avctx, p);
return -1;
}
}
if (s->has_alpha) {
int bak_w = avctx->width;
int bak_h = avctx->height;
int bak_cw = avctx->coded_width;
int bak_ch = avctx->coded_height;
buf += alpha_offset;
remaining_buf_size -= alpha_offset;
res = s->alpha_context->parse_header(s->alpha_context, buf, remaining_buf_size);
if (res != 0) {
if(res==VP56_SIZE_CHANGE) {
av_log(avctx, AV_LOG_ERROR, "Alpha reconfiguration\n");
avctx->width = bak_w;
avctx->height = bak_h;
avctx->coded_width = bak_cw;
avctx->coded_height = bak_ch;
}
avctx->release_buffer(avctx, p);
return -1;
}
}
avctx->execute2(avctx, ff_vp56_decode_mbs, 0, 0, s->has_alpha + 1);
/* release frames that aren't in use */
for (i = 0; i < 4; ++i) {
AVFrame *victim = &s->frames[i];
if (!victim->data[0])
continue;
if (victim != s->framep[VP56_FRAME_PREVIOUS] &&
victim != s->framep[VP56_FRAME_GOLDEN] &&
(!s->has_alpha || victim != s->alpha_context->framep[VP56_FRAME_GOLDEN]))
avctx->release_buffer(avctx, victim);
}
p->qstride = 0;
p->qscale_table = s->qscale_table;
p->qscale_type = FF_QSCALE_TYPE_VP56;
*(AVFrame*)data = *p;
*got_frame = 1;
return avpkt->size;
}