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Diffstat (limited to 'ffmpeg/libavcodec/dnxhddec.c')
-rw-r--r--ffmpeg/libavcodec/dnxhddec.c427
1 files changed, 427 insertions, 0 deletions
diff --git a/ffmpeg/libavcodec/dnxhddec.c b/ffmpeg/libavcodec/dnxhddec.c
new file mode 100644
index 0000000..11bed00
--- /dev/null
+++ b/ffmpeg/libavcodec/dnxhddec.c
@@ -0,0 +1,427 @@
+/*
+ * VC3/DNxHD decoder.
+ * Copyright (c) 2007 SmartJog S.A., Baptiste Coudurier <baptiste dot coudurier at smartjog dot com>
+ * Copyright (c) 2011 MirriAd Ltd
+ *
+ * 10 bit support added by MirriAd Ltd, Joseph Artsimovich <joseph@mirriad.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 "libavutil/imgutils.h"
+#include "avcodec.h"
+#include "get_bits.h"
+#include "dnxhddata.h"
+#include "dsputil.h"
+#include "internal.h"
+#include "thread.h"
+
+typedef struct DNXHDContext {
+ AVCodecContext *avctx;
+ GetBitContext gb;
+ int64_t 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, int16_t, blocks)[8][64];
+ ScanTable scantable;
+ const CIDEntry *cid_table;
+ int bit_depth; // 8, 10 or 0 if not initialized at all.
+ void (*decode_dct_block)(struct DNXHDContext *ctx, int16_t *block,
+ int n, int qscale);
+ int last_qscale;
+ int luma_scale[64];
+ int chroma_scale[64];
+} DNXHDContext;
+
+#define DNXHD_VLC_BITS 9
+#define DNXHD_DC_VLC_BITS 7
+
+static void dnxhd_decode_dct_block_8(DNXHDContext *ctx, int16_t *block, int n, int qscale);
+static void dnxhd_decode_dct_block_10(DNXHDContext *ctx, int16_t *block, int n, int qscale);
+
+static av_cold int dnxhd_decode_init(AVCodecContext *avctx)
+{
+ DNXHDContext *ctx = avctx->priv_data;
+
+ ctx->avctx = avctx;
+ ctx->cid = -1;
+ return 0;
+}
+
+static int dnxhd_init_vlc(DNXHDContext *ctx, uint32_t cid)
+{
+ if (cid != ctx->cid) {
+ 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;
+ }
+ if (ff_dnxhd_cid_table[index].bit_depth != ctx->bit_depth) {
+ av_log(ctx->avctx, AV_LOG_ERROR, "bit depth mismatches %d %d\n", ff_dnxhd_cid_table[index].bit_depth, ctx->bit_depth);
+ return AVERROR_INVALIDDATA;
+ }
+ ctx->cid_table = &ff_dnxhd_cid_table[index];
+
+ ff_free_vlc(&ctx->ac_vlc);
+ ff_free_vlc(&ctx->dc_vlc);
+ ff_free_vlc(&ctx->run_vlc);
+
+ 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->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);
+ ctx->cid = cid;
+ }
+ return 0;
+}
+
+static int dnxhd_decode_header(DNXHDContext *ctx, AVFrame *frame,
+ const uint8_t *buf, int buf_size, int first_field)
+{
+ static const uint8_t header_prefix[] = { 0x00, 0x00, 0x02, 0x80, 0x01 };
+ int i, cid;
+
+ 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;
+ frame->interlaced_frame = 1;
+ frame->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);
+
+ av_dlog(ctx->avctx, "width %d, height %d\n", ctx->width, ctx->height);
+
+ if (buf[0x21] & 0x40) {
+ ctx->avctx->pix_fmt = AV_PIX_FMT_YUV422P10;
+ ctx->avctx->bits_per_raw_sample = 10;
+ if (ctx->bit_depth != 10) {
+ ff_dsputil_init(&ctx->dsp, ctx->avctx);
+ ctx->bit_depth = 10;
+ ctx->decode_dct_block = dnxhd_decode_dct_block_10;
+ }
+ } else {
+ ctx->avctx->pix_fmt = AV_PIX_FMT_YUV422P;
+ ctx->avctx->bits_per_raw_sample = 8;
+ if (ctx->bit_depth != 8) {
+ ff_dsputil_init(&ctx->dsp, ctx->avctx);
+ ctx->bit_depth = 8;
+ ctx->decode_dct_block = dnxhd_decode_dct_block_8;
+ }
+ }
+
+ cid = AV_RB32(buf + 0x28);
+ av_dlog(ctx->avctx, "compression id %d\n", cid);
+
+ if (dnxhd_init_vlc(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];
+
+ av_dlog(ctx->avctx, "mb width %d, mb height %d\n", ctx->mb_width, ctx->mb_height);
+
+ if ((ctx->height+15)>>4 == ctx->mb_height && frame->interlaced_frame)
+ ctx->height <<= 1;
+
+ if (ctx->mb_height > 68 ||
+ (ctx->mb_height << frame->interlaced_frame) > (ctx->height+15)>>4) {
+ av_log(ctx->avctx, AV_LOG_ERROR, "mb height too big: %d\n", ctx->mb_height);
+ return -1;
+ }
+
+ for (i = 0; i < ctx->mb_height; i++) {
+ ctx->mb_scan_index[i] = AV_RB32(buf + 0x170 + (i<<2));
+ av_dlog(ctx->avctx, "mb scan index %d\n", ctx->mb_scan_index[i]);
+ if (buf_size < ctx->mb_scan_index[i] + 0x280LL) {
+ av_log(ctx->avctx, AV_LOG_ERROR, "invalid mb scan index\n");
+ return -1;
+ }
+ }
+
+ return 0;
+}
+
+static av_always_inline void dnxhd_decode_dct_block(DNXHDContext *ctx,
+ int16_t *block, int n,
+ int qscale,
+ int index_bits,
+ int level_bias,
+ int level_shift)
+{
+ int i, j, index1, index2, len, flags;
+ int level, component, sign;
+ const int *scale;
+ const uint8_t *weight_matrix;
+ const uint8_t *ac_level = ctx->cid_table->ac_level;
+ const uint8_t *ac_flags = ctx->cid_table->ac_flags;
+ const int eob_index = ctx->cid_table->eob_index;
+ OPEN_READER(bs, &ctx->gb);
+
+ if (n&2) {
+ component = 1 + (n&1);
+ scale = ctx->chroma_scale;
+ weight_matrix = ctx->cid_table->chroma_weight;
+ } else {
+ component = 0;
+ scale = ctx->luma_scale;
+ weight_matrix = ctx->cid_table->luma_weight;
+ }
+
+ UPDATE_CACHE(bs, &ctx->gb);
+ GET_VLC(len, bs, &ctx->gb, ctx->dc_vlc.table, DNXHD_DC_VLC_BITS, 1);
+ if (len) {
+ level = GET_CACHE(bs, &ctx->gb);
+ LAST_SKIP_BITS(bs, &ctx->gb, len);
+ sign = ~level >> 31;
+ level = (NEG_USR32(sign ^ level, len) ^ sign) - sign;
+ ctx->last_dc[component] += level;
+ }
+ block[0] = ctx->last_dc[component];
+
+ i = 0;
+
+ UPDATE_CACHE(bs, &ctx->gb);
+ GET_VLC(index1, bs, &ctx->gb, ctx->ac_vlc.table,
+ DNXHD_VLC_BITS, 2);
+
+ while (index1 != eob_index) {
+ level = ac_level[index1];
+ flags = ac_flags[index1];
+
+ sign = SHOW_SBITS(bs, &ctx->gb, 1);
+ SKIP_BITS(bs, &ctx->gb, 1);
+
+ if (flags & 1) {
+ level += SHOW_UBITS(bs, &ctx->gb, index_bits) << 7;
+ SKIP_BITS(bs, &ctx->gb, index_bits);
+ }
+
+ if (flags & 2) {
+ UPDATE_CACHE(bs, &ctx->gb);
+ GET_VLC(index2, bs, &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);
+ break;
+ }
+
+ j = ctx->scantable.permutated[i];
+ level *= scale[i];
+ if (level_bias < 32 || weight_matrix[i] != level_bias)
+ level += level_bias;
+ level >>= level_shift;
+
+ block[j] = (level^sign) - sign;
+
+ UPDATE_CACHE(bs, &ctx->gb);
+ GET_VLC(index1, bs, &ctx->gb, ctx->ac_vlc.table,
+ DNXHD_VLC_BITS, 2);
+ }
+
+ CLOSE_READER(bs, &ctx->gb);
+}
+
+static void dnxhd_decode_dct_block_8(DNXHDContext *ctx, int16_t *block,
+ int n, int qscale)
+{
+ dnxhd_decode_dct_block(ctx, block, n, qscale, 4, 32, 6);
+}
+
+static void dnxhd_decode_dct_block_10(DNXHDContext *ctx, int16_t *block,
+ int n, int qscale)
+{
+ dnxhd_decode_dct_block(ctx, block, n, qscale, 6, 8, 4);
+}
+
+static int dnxhd_decode_macroblock(DNXHDContext *ctx, AVFrame *frame, int x, int y)
+{
+ int shift1 = ctx->bit_depth == 10;
+ int dct_linesize_luma = frame->linesize[0];
+ int dct_linesize_chroma = frame->linesize[1];
+ uint8_t *dest_y, *dest_u, *dest_v;
+ int dct_y_offset, dct_x_offset;
+ int qscale, i;
+
+ qscale = get_bits(&ctx->gb, 11);
+ skip_bits1(&ctx->gb);
+
+ if (qscale != ctx->last_qscale) {
+ for (i = 0; i < 64; i++) {
+ ctx->luma_scale[i] = qscale * ctx->cid_table->luma_weight[i];
+ ctx->chroma_scale[i] = qscale * ctx->cid_table->chroma_weight[i];
+ }
+ ctx->last_qscale = qscale;
+ }
+
+ for (i = 0; i < 8; i++) {
+ ctx->dsp.clear_block(ctx->blocks[i]);
+ ctx->decode_dct_block(ctx, ctx->blocks[i], i, qscale);
+ }
+
+ if (frame->interlaced_frame) {
+ dct_linesize_luma <<= 1;
+ dct_linesize_chroma <<= 1;
+ }
+
+ dest_y = frame->data[0] + ((y * dct_linesize_luma) << 4) + (x << (4 + shift1));
+ dest_u = frame->data[1] + ((y * dct_linesize_chroma) << 4) + (x << (3 + shift1));
+ dest_v = frame->data[2] + ((y * dct_linesize_chroma) << 4) + (x << (3 + shift1));
+
+ if (ctx->cur_field) {
+ dest_y += frame->linesize[0];
+ dest_u += frame->linesize[1];
+ dest_v += frame->linesize[2];
+ }
+
+ dct_y_offset = dct_linesize_luma << 3;
+ dct_x_offset = 8 << shift1;
+ ctx->dsp.idct_put(dest_y, dct_linesize_luma, ctx->blocks[0]);
+ ctx->dsp.idct_put(dest_y + dct_x_offset, dct_linesize_luma, ctx->blocks[1]);
+ ctx->dsp.idct_put(dest_y + dct_y_offset, dct_linesize_luma, ctx->blocks[4]);
+ ctx->dsp.idct_put(dest_y + dct_y_offset + dct_x_offset, dct_linesize_luma, ctx->blocks[5]);
+
+ if (!(ctx->avctx->flags & CODEC_FLAG_GRAY)) {
+ dct_y_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_y_offset, dct_linesize_chroma, ctx->blocks[6]);
+ ctx->dsp.idct_put(dest_v + dct_y_offset, dct_linesize_chroma, ctx->blocks[7]);
+ }
+
+ return 0;
+}
+
+static int dnxhd_decode_macroblocks(DNXHDContext *ctx, AVFrame *frame,
+ 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->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, frame, x, y);
+ //STOP_TIMER("decode macroblock");
+ }
+ }
+ return 0;
+}
+
+static int dnxhd_decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
+ AVPacket *avpkt)
+{
+ const uint8_t *buf = avpkt->data;
+ int buf_size = avpkt->size;
+ DNXHDContext *ctx = avctx->priv_data;
+ ThreadFrame frame = { .f = data };
+ AVFrame *picture = data;
+ int first_field = 1;
+ int ret;
+
+ av_dlog(avctx, "frame size %d\n", buf_size);
+
+ decode_coding_unit:
+ if (dnxhd_decode_header(ctx, picture, buf, buf_size, first_field) < 0)
+ return -1;
+
+ 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;
+ }
+
+ if (av_image_check_size(ctx->width, ctx->height, 0, avctx))
+ return -1;
+ avcodec_set_dimensions(avctx, ctx->width, ctx->height);
+
+ if (first_field) {
+ if ((ret = ff_thread_get_buffer(avctx, &frame, 0)) < 0)
+ 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 avpkt->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",
+ .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 | CODEC_CAP_FRAME_THREADS,
+ .long_name = NULL_IF_CONFIG_SMALL("VC3/DNxHD"),
+};
generated by cgit v1.2.3 (git 2.39.1) at 2025-12-06 20:23:16 +0000