dnxhd decoder

Originally committed as revision 8445 to svn://svn.ffmpeg.org/ffmpeg/trunk

1 files changed, 368 insertions, 0 deletions

diff --git a/libavcodec/dnxhddec.c b/libavcodec/dnxhddec.c
new file mode 100644
index 0000000000..36232be1b7
--- /dev/null
+++ b/libavcodec/dnxhddec.c
@@ -0,0 +1,368 @@
+/*
+ * 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 {
+    int cid;
+    unsigned int width, height;
+    int interlaced;
+    unsigned int frame_size;
+    int index_bits;
+    int bit_depth;
+    const uint8_t *luma_weigth, *chroma_weigth;
+    const uint8_t *dc_codes, *dc_bits;
+    const uint16_t *ac_codes;
+    const uint8_t *ac_bits, *ac_level;
+    const uint8_t *ac_run_flag, *ac_index_flag;
+    const uint16_t *run_codes;
+    const uint8_t *run_bits, *run;
+} CIDEntry;
+
+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
+    int index_bits;                     ///< length of index value
+    VLC ac_vlc, dc_vlc, run_vlc;
+    const uint8_t *ac_level, *run;
+    const uint8_t *ac_run_flag, *ac_index_flag;
+    const uint8_t *luma_weigth, *chroma_weigth;
+    int last_dc[3];
+    DSPContext dsp;
+    DECLARE_ALIGNED_16(DCTELEM, blocks[8][64]);
+    DECLARE_ALIGNED_8(ScanTable, scantable);
+    const CIDEntry *cid_table;
+} DNXHDContext;
+
+static const CIDEntry cid_table[] = {
+    { 1238, 1920, 1080, 0, 917504, 4, 8,
+      dnxhd_1238_luma_weigth, dnxhd_1238_chroma_weigth,
+      dnxhd_1238_dc_codes, dnxhd_1238_dc_bits,
+      dnxhd_1238_ac_codes, dnxhd_1238_ac_bits, dnxhd_1238_ac_level,
+      dnxhd_1238_ac_run_flag, dnxhd_1238_ac_index_flag,
+      dnxhd_1238_run_codes, dnxhd_1238_run_bits, dnxhd_1238_run },
+/*     { 1243, 1920, 1080, 1, 917504, 4, 8, */
+/*       dnxhd_1243_luma_weigth, dnxhd_1243_chroma_weigth, */
+/*       dnxhd_1238_dc_codes, dnxhd_1238_dc_bits, */
+/*       dnxhd_1238_ac_codes, dnxhd_1238_ac_bits, dnxhd_1238_ac_level, */
+/*       dnxhd_1238_ac_run_flag, dnxhd_1238_ac_index_flag, */
+/*       dnxhd_1238_run_codes, dnxhd_1238_run_bits, dnxhd_1238_run }, */
+};
+
+static int dnxhd_get_cid_table(int cid)
+{
+    int i;
+    for (i = 0; i < sizeof(cid_table)/sizeof(CIDEntry); i++)
+        if (cid_table[i].cid == cid)
+            return i;
+    return -1;
+}
+
+#define DNXHD_VLC_BITS 9
+#define DNXHD_DC_VLC_BITS 6
+
+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 = dnxhd_get_cid_table(cid)) < 0) {
+            av_log(ctx->avctx, AV_LOG_ERROR, "unsupported cid %d\n", cid);
+            return -1;
+        }
+        ctx->cid_table = &cid_table[index];
+        init_vlc(&ctx->ac_vlc, DNXHD_VLC_BITS, 257,
+                 cid_table->ac_bits, 1, 1,
+                 cid_table->ac_codes, 2, 2, 0);
+        init_vlc(&ctx->dc_vlc, DNXHD_DC_VLC_BITS, 12,
+                 cid_table->dc_bits, 1, 1,
+                 cid_table->dc_codes, 1, 1, 0);
+        init_vlc(&ctx->run_vlc, DNXHD_VLC_BITS, 62,
+                 cid_table->run_bits, 1, 1,
+                 cid_table->run_codes, 2, 2, 0);
+
+        ctx->run           = cid_table->run;
+        ctx->ac_level      = cid_table->ac_level;
+        ctx->ac_run_flag   = cid_table->ac_run_flag;
+        ctx->ac_index_flag = cid_table->ac_index_flag;
+        ctx->luma_weigth   = cid_table->luma_weigth;
+        ctx->chroma_weigth = cid_table->chroma_weigth;
+
+        ctx->index_bits = cid_table->index_bits;
+
+        ff_init_scantable(ctx->dsp.idct_permutation, &ctx->scantable, ff_zigzag_direct);
+    }
+    return 0;
+}
+
+static int dnxhd_decode_header(DNXHDContext *ctx, uint8_t *buf, int buf_size)
+{
+    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 FIXME top or bottom */
+        ctx->picture.interlaced_frame = 1;
+        av_log(ctx->avctx, AV_LOG_DEBUG, "interlaced %d\n", buf[5] & 3);
+    }
+
+    ctx->height = AV_RB16(buf + 0x18);
+    ctx->width  = AV_RB16(buf + 0x1a);
+
+    dprintf(ctx->avctx, AV_LOG_DEBUG, "width %d, heigth %d\n", ctx->width, ctx->height);
+
+    if (buf[0x21] & 0x80) {
+        av_log(ctx->avctx, AV_LOG_ERROR, "10 bit per component\n");
+        return -1;
+    }
+
+    ctx->cid = AV_RB32(buf + 0x28);
+    dprintf(ctx->avctx, AV_LOG_DEBUG, "compression id %d\n", ctx->cid);
+
+    if (dnxhd_init_vlc(ctx, ctx->cid) < 0)
+        return -1;
+
+    if (buf_size < ctx->cid_table->frame_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, AV_LOG_DEBUG, "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, AV_LOG_DEBUG, "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->chroma_weigth;
+    } else {
+        component = 0;
+        weigth_matrix = ctx->luma_weigth;
+    }
+
+    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->ac_level[index];
+        if (!level) { /* EOB */
+            //av_log(ctx->avctx, AV_LOG_DEBUG, "EOB\n");
+            return;
+        }
+        sign = get_sbits(&ctx->gb, 1);
+
+        if (ctx->ac_index_flag[index]) {
+            level += get_bits(&ctx->gb, ctx->index_bits)<<6;
+        }
+
+        if (ctx->ac_run_flag[index]) {
+            index2 = get_vlc2(&ctx->gb, ctx->run_vlc.table, DNXHD_VLC_BITS, 2);
+            i += ctx->run[index2];
+        }
+
+        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 (weigth_matrix[i] != 32) // FIXME 10bit
+            level += 32;
+        level >>= 6;
+        level = (level^sign) - sign;
+
+        if (i > 63) {
+            av_log(ctx->avctx, AV_LOG_ERROR, "ac tex damaged %d, %d\n", n, i);
+            return;
+        }
+
+        //av_log(NULL, AV_LOG_DEBUG, "i %d, j %d, end level %d\n", i, j, level);
+        block[j] = level;
+    }
+}
+
+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);
+    }
+    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);
+
+    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, uint8_t *buf, int buf_size)
+{
+    int x, y;
+    for (y = 0; y < ctx->mb_height; y++) {
+        memset(ctx->last_dc, 4, sizeof(ctx->last_dc)); // 4 for levels +128
+        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,
+                              uint8_t *buf, int buf_size)
+{
+    DNXHDContext *ctx = avctx->priv_data;
+    AVFrame *picture = data;
+
+    dprintf(avctx, AV_LOG_DEBUG, "frame size %d\n", buf_size);
+
+    if (dnxhd_decode_header(ctx, buf, buf_size) < 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 (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);
+
+    *picture = ctx->picture;
+    *data_size = sizeof(AVPicture);
+    return 0;
+}
+
+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,
+};