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ffmpeg / libavcodec / dnxhddec.c @ 2912e87a

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/*
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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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 *
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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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//#define TRACE
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//#define DEBUG
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#include "libavutil/imgutils.h"
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#include "avcodec.h"
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#include "get_bits.h"
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#include "dnxhddata.h"
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#include "dsputil.h"
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typedef struct {
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    AVCodecContext *avctx;
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    AVFrame picture;
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    GetBitContext gb;
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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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    DSPContext dsp;
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    DECLARE_ALIGNED(16, DCTELEM, blocks)[8][64];
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    ScanTable scantable;
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    const CIDEntry *cid_table;
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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 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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    dsputil_init(&ctx->dsp, avctx);
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    avctx->coded_frame = &ctx->picture;
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    ctx->picture.type = FF_I_TYPE;
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    ctx->picture.key_frame = 1;
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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 (!ctx->cid_table) {
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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 -1;
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        }
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        ctx->cid_table = &ff_dnxhd_cid_table[index];
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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->cid_table->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->dsp.idct_permutation, &ctx->scantable, ff_zigzag_direct);
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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, const uint8_t *buf, int buf_size, 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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    int i;
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    if (buf_size < 0x280)
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        return -1;
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    if (memcmp(buf, header_prefix, 5)) {
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        av_log(ctx->avctx, AV_LOG_ERROR, "error in header\n");
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        return -1;
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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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        ctx->picture.interlaced_frame = 1;
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        ctx->picture.top_field_first = first_field ^ ctx->cur_field;
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        av_log(ctx->avctx, AV_LOG_DEBUG, "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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    av_dlog(ctx->avctx, "width %d, heigth %d\n", ctx->width, ctx->height);
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    if (buf[0x21] & 0x40) {
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        av_log(ctx->avctx, AV_LOG_ERROR, "10 bit per component\n");
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        return -1;
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    }
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    ctx->cid = AV_RB32(buf + 0x28);
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    av_dlog(ctx->avctx, "compression id %d\n", ctx->cid);
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    if (dnxhd_init_vlc(ctx, ctx->cid) < 0)
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        return -1;
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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\n");
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        return -1;
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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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    av_dlog(ctx->avctx, "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 && ctx->picture.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<<ctx->picture.interlaced_frame) > (ctx->height+15)>>4) {
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        av_log(ctx->avctx, AV_LOG_ERROR, "mb height too big: %d\n", ctx->mb_height);
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        return -1;
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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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        av_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, "invalid mb scan index\n");
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            return -1;
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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_dc(DNXHDContext *ctx)
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{
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    int len;
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    len = get_vlc2(&ctx->gb, ctx->dc_vlc.table, DNXHD_DC_VLC_BITS, 1);
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    return len ? get_xbits(&ctx->gb, len) : 0;
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}
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static void dnxhd_decode_dct_block(DNXHDContext *ctx, DCTELEM *block, int n, int qscale)
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{
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    int i, j, index, index2;
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    int level, component, sign;
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    const uint8_t *weigth_matrix;
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    if (n&2) {
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        component = 1 + (n&1);
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        weigth_matrix = ctx->cid_table->chroma_weight;
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    } else {
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        component = 0;
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        weigth_matrix = ctx->cid_table->luma_weight;
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    }
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    ctx->last_dc[component] += dnxhd_decode_dc(ctx);
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    block[0] = ctx->last_dc[component];
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    //av_log(ctx->avctx, AV_LOG_DEBUG, "dc %d\n", block[0]);
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    for (i = 1; ; i++) {
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        index = get_vlc2(&ctx->gb, ctx->ac_vlc.table, DNXHD_VLC_BITS, 2);
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        //av_log(ctx->avctx, AV_LOG_DEBUG, "index %d\n", index);
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        level = ctx->cid_table->ac_level[index];
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        if (!level) { /* EOB */
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            //av_log(ctx->avctx, AV_LOG_DEBUG, "EOB\n");
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            return;
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        }
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        sign = get_sbits(&ctx->gb, 1);
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        if (ctx->cid_table->ac_index_flag[index]) {
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            level += get_bits(&ctx->gb, ctx->cid_table->index_bits)<<6;
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        }
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        if (ctx->cid_table->ac_run_flag[index]) {
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            index2 = get_vlc2(&ctx->gb, ctx->run_vlc.table, 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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            return;
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        }
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        j = ctx->scantable.permutated[i];
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        //av_log(ctx->avctx, AV_LOG_DEBUG, "j %d\n", j);
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        //av_log(ctx->avctx, AV_LOG_DEBUG, "level %d, weigth %d\n", level, weigth_matrix[i]);
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        level = (2*level+1) * qscale * weigth_matrix[i];
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        if (ctx->cid_table->bit_depth == 10) {
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            if (weigth_matrix[i] != 8)
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                level += 8;
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            level >>= 4;
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        } else {
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            if (weigth_matrix[i] != 32)
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                level += 32;
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            level >>= 6;
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        }
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        //av_log(NULL, AV_LOG_DEBUG, "i %d, j %d, end level %d\n", i, j, level);
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        block[j] = (level^sign) - sign;
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    }
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}
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static int dnxhd_decode_macroblock(DNXHDContext *ctx, int x, int y)
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{
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    int dct_linesize_luma   = ctx->picture.linesize[0];
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    int dct_linesize_chroma = ctx->picture.linesize[1];
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    uint8_t *dest_y, *dest_u, *dest_v;
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    int dct_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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    //av_log(ctx->avctx, AV_LOG_DEBUG, "qscale %d\n", qscale);
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233
    for (i = 0; i < 8; i++) {
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        ctx->dsp.clear_block(ctx->blocks[i]);
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        dnxhd_decode_dct_block(ctx, ctx->blocks[i], i, qscale);
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    }
237

    
238
    if (ctx->picture.interlaced_frame) {
239
        dct_linesize_luma   <<= 1;
240
        dct_linesize_chroma <<= 1;
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    }
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243
    dest_y = ctx->picture.data[0] + ((y * dct_linesize_luma)   << 4) + (x << 4);
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    dest_u = ctx->picture.data[1] + ((y * dct_linesize_chroma) << 4) + (x << 3);
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    dest_v = ctx->picture.data[2] + ((y * dct_linesize_chroma) << 4) + (x << 3);
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247
    if (ctx->cur_field) {
248
        dest_y += ctx->picture.linesize[0];
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        dest_u += ctx->picture.linesize[1];
250
        dest_v += ctx->picture.linesize[2];
251
    }
252

    
253
    dct_offset = dct_linesize_luma << 3;
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    ctx->dsp.idct_put(dest_y,                  dct_linesize_luma, ctx->blocks[0]);
255
    ctx->dsp.idct_put(dest_y + 8,              dct_linesize_luma, ctx->blocks[1]);
256
    ctx->dsp.idct_put(dest_y + dct_offset,     dct_linesize_luma, ctx->blocks[4]);
257
    ctx->dsp.idct_put(dest_y + dct_offset + 8, dct_linesize_luma, ctx->blocks[5]);
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259
    if (!(ctx->avctx->flags & CODEC_FLAG_GRAY)) {
260
        dct_offset = dct_linesize_chroma << 3;
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        ctx->dsp.idct_put(dest_u,              dct_linesize_chroma, ctx->blocks[2]);
262
        ctx->dsp.idct_put(dest_v,              dct_linesize_chroma, ctx->blocks[3]);
263
        ctx->dsp.idct_put(dest_u + dct_offset, dct_linesize_chroma, ctx->blocks[6]);
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        ctx->dsp.idct_put(dest_v + dct_offset, dct_linesize_chroma, ctx->blocks[7]);
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    }
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267
    return 0;
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}
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static int dnxhd_decode_macroblocks(DNXHDContext *ctx, const uint8_t *buf, int buf_size)
271
{
272
    int x, y;
273
    for (y = 0; y < ctx->mb_height; y++) {
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        ctx->last_dc[0] =
275
        ctx->last_dc[1] =
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        ctx->last_dc[2] = 1<<(ctx->cid_table->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);
278
        for (x = 0; x < ctx->mb_width; x++) {
279
            //START_TIMER;
280
            dnxhd_decode_macroblock(ctx, x, y);
281
            //STOP_TIMER("decode macroblock");
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        }
283
    }
284
    return 0;
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}
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static int dnxhd_decode_frame(AVCodecContext *avctx, void *data, int *data_size,
288
                              AVPacket *avpkt)
289
{
290
    const uint8_t *buf = avpkt->data;
291
    int buf_size = avpkt->size;
292
    DNXHDContext *ctx = avctx->priv_data;
293
    AVFrame *picture = data;
294
    int first_field = 1;
295

    
296
    av_dlog(avctx, "frame size %d\n", buf_size);
297

    
298
 decode_coding_unit:
299
    if (dnxhd_decode_header(ctx, buf, buf_size, first_field) < 0)
300
        return -1;
301

    
302
    if ((avctx->width || avctx->height) &&
303
        (ctx->width != avctx->width || ctx->height != avctx->height)) {
304
        av_log(avctx, AV_LOG_WARNING, "frame size changed: %dx%d -> %dx%d\n",
305
               avctx->width, avctx->height, ctx->width, ctx->height);
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        first_field = 1;
307
    }
308

    
309
    avctx->pix_fmt = PIX_FMT_YUV422P;
310
    if (av_image_check_size(ctx->width, ctx->height, 0, avctx))
311
        return -1;
312
    avcodec_set_dimensions(avctx, ctx->width, ctx->height);
313

    
314
    if (first_field) {
315
        if (ctx->picture.data[0])
316
            avctx->release_buffer(avctx, &ctx->picture);
317
        if (avctx->get_buffer(avctx, &ctx->picture) < 0) {
318
            av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
319
            return -1;
320
        }
321
    }
322

    
323
    dnxhd_decode_macroblocks(ctx, buf + 0x280, buf_size - 0x280);
324

    
325
    if (first_field && ctx->picture.interlaced_frame) {
326
        buf      += ctx->cid_table->coding_unit_size;
327
        buf_size -= ctx->cid_table->coding_unit_size;
328
        first_field = 0;
329
        goto decode_coding_unit;
330
    }
331

    
332
    *picture = ctx->picture;
333
    *data_size = sizeof(AVPicture);
334
    return buf_size;
335
}
336

    
337
static av_cold int dnxhd_decode_close(AVCodecContext *avctx)
338
{
339
    DNXHDContext *ctx = avctx->priv_data;
340

    
341
    if (ctx->picture.data[0])
342
        avctx->release_buffer(avctx, &ctx->picture);
343
    free_vlc(&ctx->ac_vlc);
344
    free_vlc(&ctx->dc_vlc);
345
    free_vlc(&ctx->run_vlc);
346
    return 0;
347
}
348

    
349
AVCodec ff_dnxhd_decoder = {
350
    "dnxhd",
351
    AVMEDIA_TYPE_VIDEO,
352
    CODEC_ID_DNXHD,
353
    sizeof(DNXHDContext),
354
    dnxhd_decode_init,
355
    NULL,
356
    dnxhd_decode_close,
357
    dnxhd_decode_frame,
358
    CODEC_CAP_DR1,
359
    .long_name = NULL_IF_CONFIG_SMALL("VC3/DNxHD"),
360
};