RepoMirrors
/
ffmpeg
mirror of https://git.ffmpeg.org/ffmpeg.git
1
0
Fork 0
Code Issues Projects Releases Wiki Activity
ffmpeg/libavcodec/dnxhddec.c

347 lines
11 KiB
C
Raw Blame History

/*
* VC3/DNxHD decoder.
* Copyright (c) 2007 SmartJog S.A., Baptiste Coudurier <baptiste dot coudurier at smartjog dot com>.
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
//#define TRACE
//#define DEBUG
#include "avcodec.h"
#include "bitstream.h"
#include "dnxhddata.h"
#include "dsputil.h"
#include "mpegvideo.h"
typedef struct {
AVCodecContext *avctx;
AVFrame picture;
GetBitContext gb;
int cid; ///< compression id
unsigned int width, height;
unsigned int mb_width, mb_height;
uint32_t mb_scan_index[68]; /* max for 1080p */
int cur_field; ///< current interlaced field
VLC ac_vlc, dc_vlc, run_vlc;
int last_dc[3];
DSPContext dsp;
DECLARE_ALIGNED_16(DCTELEM, blocks[8][64]);
DECLARE_ALIGNED_8(ScanTable, scantable);
const CIDEntry *cid_table;
} DNXHDContext;
#define DNXHD_VLC_BITS 9
#define DNXHD_DC_VLC_BITS 7
static int dnxhd_decode_init(AVCodecContext *avctx)
{
DNXHDContext *ctx = avctx->priv_data;
ctx->avctx = avctx;
dsputil_init(&ctx->dsp, avctx);
avctx->coded_frame = &ctx->picture;
ctx->picture.type = FF_I_TYPE;
return 0;
}
static int dnxhd_init_vlc(DNXHDContext *ctx, int cid)
{
if (!ctx->cid_table) {
int index;
if ((index = ff_dnxhd_get_cid_table(cid)) < 0) {
av_log(ctx->avctx, AV_LOG_ERROR, "unsupported cid %d\n", cid);
return -1;
}
ctx->cid_table = &ff_dnxhd_cid_table[index];
init_vlc(&ctx->ac_vlc, DNXHD_VLC_BITS, 257,
ctx->cid_table->ac_bits, 1, 1,
ctx->cid_table->ac_codes, 2, 2, 0);
init_vlc(&ctx->dc_vlc, DNXHD_DC_VLC_BITS, ctx->cid_table->bit_depth+4,
ctx->cid_table->dc_bits, 1, 1,
ctx->cid_table->dc_codes, 1, 1, 0);
init_vlc(&ctx->run_vlc, DNXHD_VLC_BITS, 62,
ctx->cid_table->run_bits, 1, 1,
ctx->cid_table->run_codes, 2, 2, 0);
ff_init_scantable(ctx->dsp.idct_permutation, &ctx->scantable, ff_zigzag_direct);
}
return 0;
}
static int dnxhd_decode_header(DNXHDContext *ctx, const uint8_t *buf, int buf_size, int first_field)
{
static const uint8_t header_prefix[] = { 0x00, 0x00, 0x02, 0x80, 0x01 };
int i;
if (buf_size < 0x280)
return -1;
if (memcmp(buf, header_prefix, 5)) {
av_log(ctx->avctx, AV_LOG_ERROR, "error in header\n");
return -1;
}
if (buf[5] & 2) { /* interlaced */
ctx->cur_field = buf[5] & 1;
ctx->picture.interlaced_frame = 1;
ctx->picture.top_field_first = first_field ^ ctx->cur_field;
av_log(ctx->avctx, AV_LOG_DEBUG, "interlaced %d, cur field %d\n", buf[5] & 3, ctx->cur_field);
}
ctx->height = AV_RB16(buf + 0x18);
ctx->width = AV_RB16(buf + 0x1a);
dprintf(ctx->avctx, "width %d, heigth %d\n", ctx->width, ctx->height);
if (buf[0x21] & 0x40) {
av_log(ctx->avctx, AV_LOG_ERROR, "10 bit per component\n");
return -1;
}
ctx->cid = AV_RB32(buf + 0x28);
dprintf(ctx->avctx, "compression id %d\n", ctx->cid);
if (dnxhd_init_vlc(ctx, ctx->cid) < 0)
return -1;
if (buf_size < ctx->cid_table->coding_unit_size) {
av_log(ctx->avctx, AV_LOG_ERROR, "incorrect frame size\n");
return -1;
}
ctx->mb_width = ctx->width>>4;
ctx->mb_height = buf[0x16d];
if (ctx->mb_height > 68) {
av_log(ctx->avctx, AV_LOG_ERROR, "mb height too big\n");
return -1;
}
dprintf(ctx->avctx, "mb width %d, mb height %d\n", ctx->mb_width, ctx->mb_height);
for (i = 0; i < ctx->mb_height; i++) {
ctx->mb_scan_index[i] = AV_RB32(buf + 0x170 + (i<<2));
dprintf(ctx->avctx, "mb scan index %d\n", ctx->mb_scan_index[i]);
if (buf_size < ctx->mb_scan_index[i] + 0x280) {
av_log(ctx->avctx, AV_LOG_ERROR, "invalid mb scan index\n");
return -1;
}
}
return 0;
}
static int dnxhd_decode_dc(DNXHDContext *ctx)
{
int len;
len = get_vlc2(&ctx->gb, ctx->dc_vlc.table, DNXHD_DC_VLC_BITS, 1);
return len ? get_xbits(&ctx->gb, len) : 0;
}
static void dnxhd_decode_dct_block(DNXHDContext *ctx, DCTELEM *block, int n, int qscale)
{
int i, j, index, index2;
int level, component, sign;
const uint8_t *weigth_matrix;
if (n&2) {
component = 1 + (n&1);
weigth_matrix = ctx->cid_table->chroma_weight;
} else {
component = 0;
weigth_matrix = ctx->cid_table->luma_weight;
}
ctx->last_dc[component] += dnxhd_decode_dc(ctx);
block[0] = ctx->last_dc[component];
//av_log(ctx->avctx, AV_LOG_DEBUG, "dc %d\n", block[0]);
for (i = 1; ; i++) {
index = get_vlc2(&ctx->gb, ctx->ac_vlc.table, DNXHD_VLC_BITS, 2);
//av_log(ctx->avctx, AV_LOG_DEBUG, "index %d\n", index);
level = ctx->cid_table->ac_level[index];
if (!level) { /* EOB */
//av_log(ctx->avctx, AV_LOG_DEBUG, "EOB\n");
return;
}
sign = get_sbits(&ctx->gb, 1);
if (ctx->cid_table->ac_index_flag[index]) {
level += get_bits(&ctx->gb, ctx->cid_table->index_bits)<<6;
}
if (ctx->cid_table->ac_run_flag[index]) {
index2 = get_vlc2(&ctx->gb, ctx->run_vlc.table, DNXHD_VLC_BITS, 2);
i += ctx->cid_table->run[index2];
}
if (i > 63) {
av_log(ctx->avctx, AV_LOG_ERROR, "ac tex damaged %d, %d\n", n, i);
return;
}
j = ctx->scantable.permutated[i];
//av_log(ctx->avctx, AV_LOG_DEBUG, "j %d\n", j);
//av_log(ctx->avctx, AV_LOG_DEBUG, "level %d, weigth %d\n", level, weigth_matrix[i]);
level = (2*level+1) * qscale * weigth_matrix[i];
if (ctx->cid_table->bit_depth == 10) {
if (weigth_matrix[i] != 8)
level += 8;
level >>= 4;
} else {
if (weigth_matrix[i] != 32)
level += 32;
level >>= 6;
}
//av_log(NULL, AV_LOG_DEBUG, "i %d, j %d, end level %d\n", i, j, level);
block[j] = (level^sign) - sign;
}
}
static int dnxhd_decode_macroblock(DNXHDContext *ctx, int x, int y)
{
int dct_linesize_luma = ctx->picture.linesize[0];
int dct_linesize_chroma = ctx->picture.linesize[1];
uint8_t *dest_y, *dest_u, *dest_v;
int dct_offset;
int qscale, i;
ctx->dsp.clear_blocks(ctx->blocks[0]);
ctx->dsp.clear_blocks(ctx->blocks[2]); // FIXME change clear blocks to take block amount
qscale = get_bits(&ctx->gb, 11);
skip_bits1(&ctx->gb);
//av_log(ctx->avctx, AV_LOG_DEBUG, "qscale %d\n", qscale);
for (i = 0; i < 8; i++) {
dnxhd_decode_dct_block(ctx, ctx->blocks[i], i, qscale);
}
if (ctx->picture.interlaced_frame) {
dct_linesize_luma <<= 1;
dct_linesize_chroma <<= 1;
}
dest_y = ctx->picture.data[0] + ((y * dct_linesize_luma) << 4) + (x << 4);
dest_u = ctx->picture.data[1] + ((y * dct_linesize_chroma) << 4) + (x << 3);
dest_v = ctx->picture.data[2] + ((y * dct_linesize_chroma) << 4) + (x << 3);
if (ctx->cur_field) {
dest_y += ctx->picture.linesize[0];
dest_u += ctx->picture.linesize[1];
dest_v += ctx->picture.linesize[2];
}
dct_offset = dct_linesize_luma << 3;
ctx->dsp.idct_put(dest_y, dct_linesize_luma, ctx->blocks[0]);
ctx->dsp.idct_put(dest_y + 8, dct_linesize_luma, ctx->blocks[1]);
ctx->dsp.idct_put(dest_y + dct_offset, dct_linesize_luma, ctx->blocks[4]);
ctx->dsp.idct_put(dest_y + dct_offset + 8, dct_linesize_luma, ctx->blocks[5]);
if (!(ctx->avctx->flags & CODEC_FLAG_GRAY)) {
dct_offset = dct_linesize_chroma << 3;
ctx->dsp.idct_put(dest_u, dct_linesize_chroma, ctx->blocks[2]);
ctx->dsp.idct_put(dest_v, dct_linesize_chroma, ctx->blocks[3]);
ctx->dsp.idct_put(dest_u + dct_offset, dct_linesize_chroma, ctx->blocks[6]);
ctx->dsp.idct_put(dest_v + dct_offset, dct_linesize_chroma, ctx->blocks[7]);
}
return 0;
}
static int dnxhd_decode_macroblocks(DNXHDContext *ctx, const uint8_t *buf, int buf_size)
{
int x, y;
for (y = 0; y < ctx->mb_height; y++) {
ctx->last_dc[0] =
ctx->last_dc[1] =
ctx->last_dc[2] = 1<<(ctx->cid_table->bit_depth+2); // for levels +2^(bitdepth-1)
init_get_bits(&ctx->gb, buf + ctx->mb_scan_index[y], (buf_size - ctx->mb_scan_index[y]) << 3);
for (x = 0; x < ctx->mb_width; x++) {
//START_TIMER;
dnxhd_decode_macroblock(ctx, x, y);
//STOP_TIMER("decode macroblock");
}
}
return 0;
}
static int dnxhd_decode_frame(AVCodecContext *avctx, void *data, int *data_size,
const uint8_t *buf, int buf_size)
{
DNXHDContext *ctx = avctx->priv_data;
AVFrame *picture = data;
int first_field = 1;
dprintf(avctx, "frame size %d\n", buf_size);
decode_coding_unit:
if (dnxhd_decode_header(ctx, buf, buf_size, first_field) < 0)
return -1;
avctx->pix_fmt = PIX_FMT_YUV422P;
if (avcodec_check_dimensions(avctx, ctx->width, ctx->height))
return -1;
avcodec_set_dimensions(avctx, ctx->width, ctx->height);
if (first_field) {
if (ctx->picture.data[0])
avctx->release_buffer(avctx, &ctx->picture);
if (avctx->get_buffer(avctx, &ctx->picture) < 0) {
av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
return -1;
}
}
dnxhd_decode_macroblocks(ctx, buf + 0x280, buf_size - 0x280);
if (first_field && ctx->picture.interlaced_frame) {
buf += ctx->cid_table->coding_unit_size;
buf_size -= ctx->cid_table->coding_unit_size;
first_field = 0;
goto decode_coding_unit;
}
*picture = ctx->picture;
*data_size = sizeof(AVPicture);
return buf_size;
}
static int dnxhd_decode_close(AVCodecContext *avctx)
{
DNXHDContext *ctx = avctx->priv_data;
if (ctx->picture.data[0])
avctx->release_buffer(avctx, &ctx->picture);
free_vlc(&ctx->ac_vlc);
free_vlc(&ctx->dc_vlc);
free_vlc(&ctx->run_vlc);
return 0;
}
AVCodec dnxhd_decoder = {
"dnxhd",
CODEC_TYPE_VIDEO,
CODEC_ID_DNXHD,
sizeof(DNXHDContext),
dnxhd_decode_init,
NULL,
dnxhd_decode_close,
dnxhd_decode_frame,
CODEC_CAP_DR1,
};
Reference in New Issue View Git Blame Copy Permalink