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476 lines
17 KiB
C
476 lines
17 KiB
C
/*
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* VC3/DNxHD decoder.
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* Copyright (c) 2007 SmartJog S.A., Baptiste Coudurier <baptiste dot coudurier at smartjog dot com>
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* Copyright (c) 2011 MirriAd Ltd
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*
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* 10 bit support added by MirriAd Ltd, Joseph Artsimovich <joseph@mirriad.com>
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*
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* This file is part of Libav.
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*
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* Libav is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* Libav is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with Libav; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "libavutil/imgutils.h"
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#include "libavutil/timer.h"
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#include "avcodec.h"
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#include "blockdsp.h"
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#include "get_bits.h"
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#include "dnxhddata.h"
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#include "idctdsp.h"
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#include "internal.h"
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typedef struct DNXHDContext {
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AVCodecContext *avctx;
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GetBitContext gb;
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BlockDSPContext bdsp;
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int cid; ///< compression id
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unsigned int width, height;
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unsigned int mb_width, mb_height;
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uint32_t mb_scan_index[68]; /* max for 1080p */
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int cur_field; ///< current interlaced field
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VLC ac_vlc, dc_vlc, run_vlc;
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int last_dc[3];
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IDCTDSPContext idsp;
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DECLARE_ALIGNED(16, int16_t, blocks)[12][64];
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ScanTable scantable;
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const CIDEntry *cid_table;
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int bit_depth; // 8, 10 or 0 if not initialized at all.
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int is_444;
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void (*decode_dct_block)(struct DNXHDContext *ctx, int16_t *block,
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int n, int qscale);
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} DNXHDContext;
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#define DNXHD_VLC_BITS 9
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#define DNXHD_DC_VLC_BITS 7
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static void dnxhd_decode_dct_block_8(DNXHDContext *ctx, int16_t *block,
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int n, int qscale);
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static void dnxhd_decode_dct_block_10(DNXHDContext *ctx, int16_t *block,
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int n, int qscale);
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static void dnxhd_decode_dct_block_10_444(DNXHDContext *ctx, int16_t *block,
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int n, int qscale);
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static av_cold int dnxhd_decode_init(AVCodecContext *avctx)
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{
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DNXHDContext *ctx = avctx->priv_data;
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ctx->avctx = avctx;
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return 0;
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}
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static int dnxhd_init_vlc(DNXHDContext *ctx, int cid)
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{
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if (cid != ctx->cid) {
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int index;
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if ((index = ff_dnxhd_get_cid_table(cid)) < 0) {
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av_log(ctx->avctx, AV_LOG_ERROR, "unsupported cid %d\n", cid);
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return AVERROR(ENOSYS);
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}
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ctx->cid_table = &ff_dnxhd_cid_table[index];
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av_log(ctx->avctx, AV_LOG_VERBOSE, "Profile cid %d.\n", cid);
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ff_free_vlc(&ctx->ac_vlc);
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ff_free_vlc(&ctx->dc_vlc);
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ff_free_vlc(&ctx->run_vlc);
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init_vlc(&ctx->ac_vlc, DNXHD_VLC_BITS, 257,
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ctx->cid_table->ac_bits, 1, 1,
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ctx->cid_table->ac_codes, 2, 2, 0);
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init_vlc(&ctx->dc_vlc, DNXHD_DC_VLC_BITS, ctx->bit_depth + 4,
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ctx->cid_table->dc_bits, 1, 1,
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ctx->cid_table->dc_codes, 1, 1, 0);
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init_vlc(&ctx->run_vlc, DNXHD_VLC_BITS, 62,
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ctx->cid_table->run_bits, 1, 1,
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ctx->cid_table->run_codes, 2, 2, 0);
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ff_init_scantable(ctx->idsp.idct_permutation, &ctx->scantable,
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ff_zigzag_direct);
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ctx->cid = cid;
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}
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return 0;
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}
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static int dnxhd_decode_header(DNXHDContext *ctx, AVFrame *frame,
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const uint8_t *buf, int buf_size,
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int first_field)
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{
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static const uint8_t header_prefix[] = { 0x00, 0x00, 0x02, 0x80, 0x01 };
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static const uint8_t header_prefix444[] = { 0x00, 0x00, 0x02, 0x80, 0x02 };
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int i, cid, ret;
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if (buf_size < 0x280) {
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av_log(ctx->avctx, AV_LOG_ERROR, "buffer too small (%d < 640).\n",
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buf_size);
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return AVERROR_INVALIDDATA;
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}
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if (memcmp(buf, header_prefix, 5) && memcmp(buf, header_prefix444, 5)) {
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av_log(ctx->avctx, AV_LOG_ERROR, "error in header\n");
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return AVERROR_INVALIDDATA;
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}
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if (buf[5] & 2) { /* interlaced */
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ctx->cur_field = buf[5] & 1;
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frame->interlaced_frame = 1;
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frame->top_field_first = first_field ^ ctx->cur_field;
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av_log(ctx->avctx, AV_LOG_DEBUG,
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"interlaced %d, cur field %d\n", buf[5] & 3, ctx->cur_field);
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}
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ctx->height = AV_RB16(buf + 0x18);
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ctx->width = AV_RB16(buf + 0x1a);
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ff_dlog(ctx->avctx, "width %d, height %d\n", ctx->width, ctx->height);
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if (!ctx->bit_depth) {
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ff_blockdsp_init(&ctx->bdsp, ctx->avctx);
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ff_idctdsp_init(&ctx->idsp, ctx->avctx);
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}
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if (buf[0x21] == 0x58) { /* 10 bit */
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ctx->bit_depth = ctx->avctx->bits_per_raw_sample = 10;
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if (buf[0x4] == 0x2) {
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ctx->decode_dct_block = dnxhd_decode_dct_block_10_444;
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ctx->avctx->pix_fmt = AV_PIX_FMT_YUV444P10;
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ctx->is_444 = 1;
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} else {
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ctx->decode_dct_block = dnxhd_decode_dct_block_10;
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ctx->avctx->pix_fmt = AV_PIX_FMT_YUV422P10;
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}
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} else if (buf[0x21] == 0x38) { /* 8 bit */
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ctx->bit_depth = ctx->avctx->bits_per_raw_sample = 8;
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ctx->avctx->pix_fmt = AV_PIX_FMT_YUV422P;
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ctx->decode_dct_block = dnxhd_decode_dct_block_8;
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} else {
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av_log(ctx->avctx, AV_LOG_ERROR, "invalid bit depth value (%d).\n",
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buf[0x21]);
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return AVERROR_INVALIDDATA;
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}
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cid = AV_RB32(buf + 0x28);
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ff_dlog(ctx->avctx, "compression id %d\n", cid);
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if ((ret = dnxhd_init_vlc(ctx, cid)) < 0)
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return ret;
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// make sure profile size constraints are respected
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// DNx100 allows 1920->1440 and 1280->960 subsampling
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if (ctx->width != ctx->cid_table->width) {
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av_reduce(&ctx->avctx->sample_aspect_ratio.num,
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&ctx->avctx->sample_aspect_ratio.den,
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ctx->width, ctx->cid_table->width, 255);
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ctx->width = ctx->cid_table->width;
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}
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if (buf_size < ctx->cid_table->coding_unit_size) {
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av_log(ctx->avctx, AV_LOG_ERROR, "incorrect frame size (%d < %d).\n",
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buf_size, ctx->cid_table->coding_unit_size);
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return AVERROR_INVALIDDATA;
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}
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ctx->mb_width = ctx->width >> 4;
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ctx->mb_height = buf[0x16d];
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ff_dlog(ctx->avctx,
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"mb width %d, mb height %d\n", ctx->mb_width, ctx->mb_height);
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if ((ctx->height + 15) >> 4 == ctx->mb_height && frame->interlaced_frame)
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ctx->height <<= 1;
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if (ctx->mb_height > 68 ||
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(ctx->mb_height << frame->interlaced_frame) > (ctx->height + 15) >> 4) {
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av_log(ctx->avctx, AV_LOG_ERROR,
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"mb height too big: %d\n", ctx->mb_height);
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return AVERROR_INVALIDDATA;
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}
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for (i = 0; i < ctx->mb_height; i++) {
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ctx->mb_scan_index[i] = AV_RB32(buf + 0x170 + (i << 2));
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ff_dlog(ctx->avctx, "mb scan index %d\n", ctx->mb_scan_index[i]);
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if (buf_size < ctx->mb_scan_index[i] + 0x280) {
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av_log(ctx->avctx, AV_LOG_ERROR,
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"invalid mb scan index (%d < %d).\n",
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buf_size, ctx->mb_scan_index[i] + 0x280);
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return AVERROR_INVALIDDATA;
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}
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}
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return 0;
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}
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static av_always_inline void dnxhd_decode_dct_block(DNXHDContext *ctx,
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int16_t *block, int n,
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int qscale,
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int index_bits,
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int level_bias,
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int level_shift)
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{
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int i, j, index1, index2, len;
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int level, component, sign;
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const uint8_t *weight_matrix;
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OPEN_READER(bs, &ctx->gb);
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if (!ctx->is_444) {
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if (n & 2) {
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component = 1 + (n & 1);
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weight_matrix = ctx->cid_table->chroma_weight;
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} else {
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component = 0;
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weight_matrix = ctx->cid_table->luma_weight;
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}
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} else {
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component = (n >> 1) % 3;
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if (component) {
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weight_matrix = ctx->cid_table->chroma_weight;
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} else {
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weight_matrix = ctx->cid_table->luma_weight;
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}
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}
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UPDATE_CACHE(bs, &ctx->gb);
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GET_VLC(len, bs, &ctx->gb, ctx->dc_vlc.table, DNXHD_DC_VLC_BITS, 1);
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if (len) {
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level = GET_CACHE(bs, &ctx->gb);
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LAST_SKIP_BITS(bs, &ctx->gb, len);
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sign = ~level >> 31;
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level = (NEG_USR32(sign ^ level, len) ^ sign) - sign;
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ctx->last_dc[component] += level;
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}
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block[0] = ctx->last_dc[component];
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for (i = 1; ; i++) {
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UPDATE_CACHE(bs, &ctx->gb);
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GET_VLC(index1, bs, &ctx->gb, ctx->ac_vlc.table,
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DNXHD_VLC_BITS, 2);
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level = ctx->cid_table->ac_level[index1];
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if (!level) /* EOB */
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break;
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sign = SHOW_SBITS(bs, &ctx->gb, 1);
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SKIP_BITS(bs, &ctx->gb, 1);
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if (ctx->cid_table->ac_index_flag[index1]) {
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level += SHOW_UBITS(bs, &ctx->gb, index_bits) << 6;
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SKIP_BITS(bs, &ctx->gb, index_bits);
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}
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if (ctx->cid_table->ac_run_flag[index1]) {
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UPDATE_CACHE(bs, &ctx->gb);
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GET_VLC(index2, bs, &ctx->gb, ctx->run_vlc.table,
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DNXHD_VLC_BITS, 2);
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i += ctx->cid_table->run[index2];
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}
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if (i > 63) {
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av_log(ctx->avctx, AV_LOG_ERROR, "ac tex damaged %d, %d\n", n, i);
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break;
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}
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j = ctx->scantable.permutated[i];
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level = (2 * level + 1) * qscale * weight_matrix[i];
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if (level_bias < 32 || weight_matrix[i] != level_bias)
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level += level_bias;
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level >>= level_shift;
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block[j] = (level ^ sign) - sign;
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}
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CLOSE_READER(bs, &ctx->gb);
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}
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static void dnxhd_decode_dct_block_8(DNXHDContext *ctx, int16_t *block,
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int n, int qscale)
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{
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dnxhd_decode_dct_block(ctx, block, n, qscale, 4, 32, 6);
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}
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static void dnxhd_decode_dct_block_10(DNXHDContext *ctx, int16_t *block,
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int n, int qscale)
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{
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dnxhd_decode_dct_block(ctx, block, n, qscale, 6, 8, 4);
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}
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static void dnxhd_decode_dct_block_10_444(DNXHDContext *ctx, int16_t *block,
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int n, int qscale)
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{
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dnxhd_decode_dct_block(ctx, block, n, qscale, 6, 32, 6);
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}
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static int dnxhd_decode_macroblock(DNXHDContext *ctx, AVFrame *frame,
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int x, int y)
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{
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int shift1 = ctx->bit_depth == 10;
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int dct_linesize_luma = frame->linesize[0];
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int dct_linesize_chroma = frame->linesize[1];
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uint8_t *dest_y, *dest_u, *dest_v;
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int dct_y_offset, dct_x_offset;
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int qscale, i;
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qscale = get_bits(&ctx->gb, 11);
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skip_bits1(&ctx->gb);
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for (i = 0; i < 8; i++) {
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ctx->bdsp.clear_block(ctx->blocks[i]);
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ctx->decode_dct_block(ctx, ctx->blocks[i], i, qscale);
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}
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if (ctx->is_444) {
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for (; i < 12; i++) {
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ctx->bdsp.clear_block(ctx->blocks[i]);
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ctx->decode_dct_block(ctx, ctx->blocks[i], i, qscale);
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}
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}
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if (frame->interlaced_frame) {
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dct_linesize_luma <<= 1;
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dct_linesize_chroma <<= 1;
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}
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dest_y = frame->data[0] + ((y * dct_linesize_luma) << 4) + (x << (4 + shift1));
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dest_u = frame->data[1] + ((y * dct_linesize_chroma) << 4) + (x << (3 + shift1 + ctx->is_444));
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dest_v = frame->data[2] + ((y * dct_linesize_chroma) << 4) + (x << (3 + shift1 + ctx->is_444));
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if (ctx->cur_field) {
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dest_y += frame->linesize[0];
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dest_u += frame->linesize[1];
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dest_v += frame->linesize[2];
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}
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dct_y_offset = dct_linesize_luma << 3;
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dct_x_offset = 8 << shift1;
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if (!ctx->is_444) {
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ctx->idsp.idct_put(dest_y, dct_linesize_luma, ctx->blocks[0]);
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ctx->idsp.idct_put(dest_y + dct_x_offset, dct_linesize_luma, ctx->blocks[1]);
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ctx->idsp.idct_put(dest_y + dct_y_offset, dct_linesize_luma, ctx->blocks[4]);
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ctx->idsp.idct_put(dest_y + dct_y_offset + dct_x_offset, dct_linesize_luma, ctx->blocks[5]);
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if (!(ctx->avctx->flags & CODEC_FLAG_GRAY)) {
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dct_y_offset = dct_linesize_chroma << 3;
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ctx->idsp.idct_put(dest_u, dct_linesize_chroma, ctx->blocks[2]);
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ctx->idsp.idct_put(dest_v, dct_linesize_chroma, ctx->blocks[3]);
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ctx->idsp.idct_put(dest_u + dct_y_offset, dct_linesize_chroma, ctx->blocks[6]);
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ctx->idsp.idct_put(dest_v + dct_y_offset, dct_linesize_chroma, ctx->blocks[7]);
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}
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} else {
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ctx->idsp.idct_put(dest_y, dct_linesize_luma, ctx->blocks[0]);
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ctx->idsp.idct_put(dest_y + dct_x_offset, dct_linesize_luma, ctx->blocks[1]);
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ctx->idsp.idct_put(dest_y + dct_y_offset, dct_linesize_luma, ctx->blocks[6]);
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ctx->idsp.idct_put(dest_y + dct_y_offset + dct_x_offset, dct_linesize_luma, ctx->blocks[7]);
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if (!(ctx->avctx->flags & CODEC_FLAG_GRAY)) {
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dct_y_offset = dct_linesize_chroma << 3;
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ctx->idsp.idct_put(dest_u, dct_linesize_chroma, ctx->blocks[2]);
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ctx->idsp.idct_put(dest_u + dct_x_offset, dct_linesize_chroma, ctx->blocks[3]);
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ctx->idsp.idct_put(dest_u + dct_y_offset, dct_linesize_chroma, ctx->blocks[8]);
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ctx->idsp.idct_put(dest_u + dct_y_offset + dct_x_offset, dct_linesize_chroma, ctx->blocks[9]);
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ctx->idsp.idct_put(dest_v, dct_linesize_chroma, ctx->blocks[4]);
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ctx->idsp.idct_put(dest_v + dct_x_offset, dct_linesize_chroma, ctx->blocks[5]);
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ctx->idsp.idct_put(dest_v + dct_y_offset, dct_linesize_chroma, ctx->blocks[10]);
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ctx->idsp.idct_put(dest_v + dct_y_offset + dct_x_offset, dct_linesize_chroma, ctx->blocks[11]);
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}
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}
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return 0;
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}
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static int dnxhd_decode_macroblocks(DNXHDContext *ctx, AVFrame *frame,
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const uint8_t *buf, int buf_size)
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{
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int x, y;
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for (y = 0; y < ctx->mb_height; y++) {
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ctx->last_dc[0] =
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ctx->last_dc[1] =
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ctx->last_dc[2] = 1 << (ctx->bit_depth + 2); // for levels +2^(bitdepth-1)
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init_get_bits(&ctx->gb, buf + ctx->mb_scan_index[y], (buf_size - ctx->mb_scan_index[y]) << 3);
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for (x = 0; x < ctx->mb_width; x++) {
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//START_TIMER;
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dnxhd_decode_macroblock(ctx, frame, x, y);
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//STOP_TIMER("decode macroblock");
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}
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}
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return 0;
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}
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static int dnxhd_decode_frame(AVCodecContext *avctx, void *data,
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int *got_frame, AVPacket *avpkt)
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{
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const uint8_t *buf = avpkt->data;
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int buf_size = avpkt->size;
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DNXHDContext *ctx = avctx->priv_data;
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AVFrame *picture = data;
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int first_field = 1;
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int ret;
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ff_dlog(avctx, "frame size %d\n", buf_size);
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|
|
|
decode_coding_unit:
|
|
if ((ret = dnxhd_decode_header(ctx, picture, buf, buf_size, first_field)) < 0)
|
|
return ret;
|
|
|
|
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;
|
|
}
|
|
|
|
ret = ff_set_dimensions(avctx, ctx->width, ctx->height);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
if (first_field) {
|
|
if ((ret = ff_get_buffer(avctx, picture, 0)) < 0) {
|
|
av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
|
|
return ret;
|
|
}
|
|
picture->pict_type = AV_PICTURE_TYPE_I;
|
|
picture->key_frame = 1;
|
|
}
|
|
|
|
dnxhd_decode_macroblocks(ctx, picture, buf + 0x280, buf_size - 0x280);
|
|
|
|
if (first_field && 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;
|
|
}
|
|
|
|
*got_frame = 1;
|
|
return buf_size;
|
|
}
|
|
|
|
static av_cold int dnxhd_decode_close(AVCodecContext *avctx)
|
|
{
|
|
DNXHDContext *ctx = avctx->priv_data;
|
|
|
|
ff_free_vlc(&ctx->ac_vlc);
|
|
ff_free_vlc(&ctx->dc_vlc);
|
|
ff_free_vlc(&ctx->run_vlc);
|
|
return 0;
|
|
}
|
|
|
|
AVCodec ff_dnxhd_decoder = {
|
|
.name = "dnxhd",
|
|
.long_name = NULL_IF_CONFIG_SMALL("VC3/DNxHD"),
|
|
.type = AVMEDIA_TYPE_VIDEO,
|
|
.id = AV_CODEC_ID_DNXHD,
|
|
.priv_data_size = sizeof(DNXHDContext),
|
|
.init = dnxhd_decode_init,
|
|
.close = dnxhd_decode_close,
|
|
.decode = dnxhd_decode_frame,
|
|
.capabilities = CODEC_CAP_DR1,
|
|
};
|