/* * 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 "get_bits.h" #include "dnxhddata.h" #include "dsputil.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 av_cold 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; 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]); 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, 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; 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 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 dnxhd_decoder = { "dnxhd", CODEC_TYPE_VIDEO, CODEC_ID_DNXHD, sizeof(DNXHDContext), dnxhd_decode_init, NULL, dnxhd_decode_close, dnxhd_decode_frame, CODEC_CAP_DR1, .long_name = NULL_IF_CONFIG_SMALL("VC3/DNxHD"), };