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ffmpeg/libavcodec/dnxhddec.c

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/*
* VC3/DNxHD decoder.
* Copyright (c) 2007 SmartJog S.A., Baptiste Coudurier <baptiste dot coudurier at smartjog dot com>
* Copyright (c) 2011 MirriAd Ltd
*
* 10 bit support added by MirriAd Ltd, Joseph Artsimovich <joseph@mirriad.com>
*
* This file is part of Libav.
*
* Libav 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.
*
* Libav 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 Libav; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
//#define TRACE
//#define DEBUG
#include "libavutil/imgutils.h"
#include "avcodec.h"
#include "get_bits.h"
#include "dnxhddata.h"
#include "dsputil.h"
typedef struct DNXHDContext {
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];
ScanTable scantable;
const CIDEntry *cid_table;
int bit_depth; // 8, 10 or 0 if not initialized at all.
void (*decode_dct_block)(struct DNXHDContext *ctx, DCTELEM *block,
int n, int qscale);
} DNXHDContext;
#define DNXHD_VLC_BITS 9
#define DNXHD_DC_VLC_BITS 7
static void dnxhd_decode_dct_block_8(DNXHDContext *ctx, DCTELEM *block, int n, int qscale);
static void dnxhd_decode_dct_block_10(DNXHDContext *ctx, DCTELEM *block, int n, int qscale);
static av_cold int dnxhd_decode_init(AVCodecContext *avctx)
{
DNXHDContext *ctx = avctx->priv_data;
ctx->avctx = avctx;
avctx->coded_frame = &ctx->picture;
ctx->picture.type = AV_PICTURE_TYPE_I;
ctx->picture.key_frame = 1;
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->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);
av_dlog(ctx->avctx, "width %d, heigth %d\n", ctx->width, ctx->height);
if (buf[0x21] & 0x40) {
ctx->avctx->pix_fmt = PIX_FMT_YUV422P10;
ctx->avctx->bits_per_raw_sample = 10;
if (ctx->bit_depth != 10) {
dsputil_init(&ctx->dsp, ctx->avctx);
ctx->bit_depth = 10;
ctx->decode_dct_block = dnxhd_decode_dct_block_10;
}
} else {
ctx->avctx->pix_fmt = PIX_FMT_YUV422P;
ctx->avctx->bits_per_raw_sample = 8;
if (ctx->bit_depth != 8) {
dsputil_init(&ctx->dsp, ctx->avctx);
ctx->bit_depth = 8;
ctx->decode_dct_block = dnxhd_decode_dct_block_8;
}
}
ctx->cid = AV_RB32(buf + 0x28);
av_dlog(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];
av_dlog(ctx->avctx, "mb width %d, mb height %d\n", ctx->mb_width, ctx->mb_height);
if ((ctx->height+15)>>4 == ctx->mb_height && ctx->picture.interlaced_frame)
ctx->height <<= 1;
if (ctx->mb_height > 68 ||
(ctx->mb_height<<ctx->picture.interlaced_frame) > (ctx->height+15)>>4) {
av_log(ctx->avctx, AV_LOG_ERROR, "mb height too big: %d\n", ctx->mb_height);
return -1;
}
for (i = 0; i < ctx->mb_height; i++) {
ctx->mb_scan_index[i] = AV_RB32(buf + 0x170 + (i<<2));
av_dlog(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 av_always_inline void dnxhd_decode_dct_block(DNXHDContext *ctx,
DCTELEM *block, int n,
int qscale,
int index_bits,
int level_bias,
int level_shift)
{
int i, j, index1, index2, len;
int level, component, sign;
const uint8_t *weight_matrix;
OPEN_READER(bs, &ctx->gb);
if (n&2) {
component = 1 + (n&1);
weight_matrix = ctx->cid_table->chroma_weight;
} else {
component = 0;
weight_matrix = ctx->cid_table->luma_weight;
}
UPDATE_CACHE(bs, &ctx->gb);
GET_VLC(len, bs, &ctx->gb, ctx->dc_vlc.table, DNXHD_DC_VLC_BITS, 1);
if (len) {
level = GET_CACHE(bs, &ctx->gb);
LAST_SKIP_BITS(bs, &ctx->gb, len);
sign = ~level >> 31;
level = (NEG_USR32(sign ^ level, len) ^ sign) - sign;
ctx->last_dc[component] += level;
}
block[0] = ctx->last_dc[component];
//av_log(ctx->avctx, AV_LOG_DEBUG, "dc %d\n", block[0]);
for (i = 1; ; i++) {
UPDATE_CACHE(bs, &ctx->gb);
GET_VLC(index1, bs, &ctx->gb, ctx->ac_vlc.table,
DNXHD_VLC_BITS, 2);
//av_log(ctx->avctx, AV_LOG_DEBUG, "index %d\n", index1);
level = ctx->cid_table->ac_level[index1];
if (!level) { /* EOB */
//av_log(ctx->avctx, AV_LOG_DEBUG, "EOB\n");
break;
}
sign = SHOW_SBITS(bs, &ctx->gb, 1);
SKIP_BITS(bs, &ctx->gb, 1);
if (ctx->cid_table->ac_index_flag[index1]) {
level += SHOW_UBITS(bs, &ctx->gb, index_bits) << 6;
SKIP_BITS(bs, &ctx->gb, index_bits);
}
if (ctx->cid_table->ac_run_flag[index1]) {
UPDATE_CACHE(bs, &ctx->gb);
GET_VLC(index2, bs, &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);
break;
}
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, weight %d\n", level, weight_matrix[i]);
level = (2*level+1) * qscale * weight_matrix[i];
if (level_bias < 32 || weight_matrix[i] != level_bias)
level += level_bias;
level >>= level_shift;
//av_log(NULL, AV_LOG_DEBUG, "i %d, j %d, end level %d\n", i, j, level);
block[j] = (level^sign) - sign;
}
CLOSE_READER(bs, &ctx->gb);
}
static void dnxhd_decode_dct_block_8(DNXHDContext *ctx, DCTELEM *block,
int n, int qscale)
{
dnxhd_decode_dct_block(ctx, block, n, qscale, 4, 32, 6);
}
static void dnxhd_decode_dct_block_10(DNXHDContext *ctx, DCTELEM *block,
int n, int qscale)
{
dnxhd_decode_dct_block(ctx, block, n, qscale, 6, 8, 4);
}
static int dnxhd_decode_macroblock(DNXHDContext *ctx, int x, int y)
{
int shift1 = ctx->bit_depth == 10;
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_y_offset, dct_x_offset;
int qscale, i;
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++) {
ctx->dsp.clear_block(ctx->blocks[i]);
ctx->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 + shift1));
dest_u = ctx->picture.data[1] + ((y * dct_linesize_chroma) << 4) + (x << (3 + shift1));
dest_v = ctx->picture.data[2] + ((y * dct_linesize_chroma) << 4) + (x << (3 + shift1));
if (ctx->cur_field) {
dest_y += ctx->picture.linesize[0];
dest_u += ctx->picture.linesize[1];
dest_v += ctx->picture.linesize[2];
}
dct_y_offset = dct_linesize_luma << 3;
dct_x_offset = 8 << shift1;
ctx->dsp.idct_put(dest_y, dct_linesize_luma, ctx->blocks[0]);
ctx->dsp.idct_put(dest_y + dct_x_offset, dct_linesize_luma, ctx->blocks[1]);
ctx->dsp.idct_put(dest_y + dct_y_offset, dct_linesize_luma, ctx->blocks[4]);
ctx->dsp.idct_put(dest_y + dct_y_offset + dct_x_offset, dct_linesize_luma, ctx->blocks[5]);
if (!(ctx->avctx->flags & CODEC_FLAG_GRAY)) {
dct_y_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_y_offset, dct_linesize_chroma, ctx->blocks[6]);
ctx->dsp.idct_put(dest_v + dct_y_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->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,
AVPacket *avpkt)
{
const uint8_t *buf = avpkt->data;
int buf_size = avpkt->size;
DNXHDContext *ctx = avctx->priv_data;
AVFrame *picture = data;
int first_field = 1;
av_dlog(avctx, "frame size %d\n", buf_size);
decode_coding_unit:
if (dnxhd_decode_header(ctx, buf, buf_size, first_field) < 0)
return -1;
if ((avctx->width || avctx->height) &&
(ctx->width != avctx->width || ctx->height != avctx->height)) {
av_log(avctx, AV_LOG_WARNING, "frame size changed: %dx%d -> %dx%d\n",
avctx->width, avctx->height, ctx->width, ctx->height);
first_field = 1;
}
if (av_image_check_size(ctx->width, ctx->height, 0, avctx))
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 av_cold 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 ff_dnxhd_decoder = {
.name = "dnxhd",
.type = AVMEDIA_TYPE_VIDEO,
.id = CODEC_ID_DNXHD,
.priv_data_size = sizeof(DNXHDContext),
.init = dnxhd_decode_init,
.close = dnxhd_decode_close,
.decode = dnxhd_decode_frame,
.capabilities = CODEC_CAP_DR1,
.long_name = NULL_IF_CONFIG_SMALL("VC3/DNxHD"),
};
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