| /* |
| * 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" |
| |
| 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, |
| 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 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"), |
| }; |