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Diffstat (limited to 'contrib/ffmpeg/libavcodec/dnxhddec.c')
-rw-r--r--contrib/ffmpeg/libavcodec/dnxhddec.c346
1 files changed, 346 insertions, 0 deletions
diff --git a/contrib/ffmpeg/libavcodec/dnxhddec.c b/contrib/ffmpeg/libavcodec/dnxhddec.c
new file mode 100644
index 000000000..8d3977ed5
--- /dev/null
+++ b/contrib/ffmpeg/libavcodec/dnxhddec.c
@@ -0,0 +1,346 @@
+/*
+ * 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"
+#include "mpegvideo.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 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;
+
+ ctx->dsp.clear_blocks(ctx->blocks[0]);
+ ctx->dsp.clear_blocks(ctx->blocks[2]); // FIXME change clear blocks to take block amount
+
+ 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++) {
+ 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 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,
+};
generated by cgit v1.2.3 (git 2.25.1) at 2025-05-09 17:42:28 +0000