Statistics
| Branch: | Revision:

ffmpeg / libavcodec / dnxhddec.c @ 72415b2a

History | View | Annotate | Download (11.4 KB)

1
/*
2
 * VC3/DNxHD decoder.
3
 * Copyright (c) 2007 SmartJog S.A., Baptiste Coudurier <baptiste dot coudurier at smartjog dot com>
4
 *
5
 * This file is part of FFmpeg.
6
 *
7
 * FFmpeg is free software; you can redistribute it and/or
8
 * modify it under the terms of the GNU Lesser General Public
9
 * License as published by the Free Software Foundation; either
10
 * version 2.1 of the License, or (at your option) any later version.
11
 *
12
 * FFmpeg is distributed in the hope that it will be useful,
13
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
15
 * Lesser General Public License for more details.
16
 *
17
 * You should have received a copy of the GNU Lesser General Public
18
 * License along with FFmpeg; if not, write to the Free Software
19
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20
 */
21

    
22
//#define TRACE
23
//#define DEBUG
24

    
25
#include "avcodec.h"
26
#include "get_bits.h"
27
#include "dnxhddata.h"
28
#include "dsputil.h"
29

    
30
typedef struct {
31
    AVCodecContext *avctx;
32
    AVFrame picture;
33
    GetBitContext gb;
34
    int cid;                            ///< compression id
35
    unsigned int width, height;
36
    unsigned int mb_width, mb_height;
37
    uint32_t mb_scan_index[68];         /* max for 1080p */
38
    int cur_field;                      ///< current interlaced field
39
    VLC ac_vlc, dc_vlc, run_vlc;
40
    int last_dc[3];
41
    DSPContext dsp;
42
    DECLARE_ALIGNED(16, DCTELEM, blocks)[8][64];
43
    ScanTable scantable;
44
    const CIDEntry *cid_table;
45
} DNXHDContext;
46

    
47
#define DNXHD_VLC_BITS 9
48
#define DNXHD_DC_VLC_BITS 7
49

    
50
static av_cold int dnxhd_decode_init(AVCodecContext *avctx)
51
{
52
    DNXHDContext *ctx = avctx->priv_data;
53

    
54
    ctx->avctx = avctx;
55
    dsputil_init(&ctx->dsp, avctx);
56
    avctx->coded_frame = &ctx->picture;
57
    ctx->picture.type = FF_I_TYPE;
58
    return 0;
59
}
60

    
61
static int dnxhd_init_vlc(DNXHDContext *ctx, int cid)
62
{
63
    if (!ctx->cid_table) {
64
        int index;
65

    
66
        if ((index = ff_dnxhd_get_cid_table(cid)) < 0) {
67
            av_log(ctx->avctx, AV_LOG_ERROR, "unsupported cid %d\n", cid);
68
            return -1;
69
        }
70
        ctx->cid_table = &ff_dnxhd_cid_table[index];
71
        init_vlc(&ctx->ac_vlc, DNXHD_VLC_BITS, 257,
72
                 ctx->cid_table->ac_bits, 1, 1,
73
                 ctx->cid_table->ac_codes, 2, 2, 0);
74
        init_vlc(&ctx->dc_vlc, DNXHD_DC_VLC_BITS, ctx->cid_table->bit_depth+4,
75
                 ctx->cid_table->dc_bits, 1, 1,
76
                 ctx->cid_table->dc_codes, 1, 1, 0);
77
        init_vlc(&ctx->run_vlc, DNXHD_VLC_BITS, 62,
78
                 ctx->cid_table->run_bits, 1, 1,
79
                 ctx->cid_table->run_codes, 2, 2, 0);
80

    
81
        ff_init_scantable(ctx->dsp.idct_permutation, &ctx->scantable, ff_zigzag_direct);
82
    }
83
    return 0;
84
}
85

    
86
static int dnxhd_decode_header(DNXHDContext *ctx, const uint8_t *buf, int buf_size, int first_field)
87
{
88
    static const uint8_t header_prefix[] = { 0x00, 0x00, 0x02, 0x80, 0x01 };
89
    int i;
90

    
91
    if (buf_size < 0x280)
92
        return -1;
93

    
94
    if (memcmp(buf, header_prefix, 5)) {
95
        av_log(ctx->avctx, AV_LOG_ERROR, "error in header\n");
96
        return -1;
97
    }
98
    if (buf[5] & 2) { /* interlaced */
99
        ctx->cur_field = buf[5] & 1;
100
        ctx->picture.interlaced_frame = 1;
101
        ctx->picture.top_field_first = first_field ^ ctx->cur_field;
102
        av_log(ctx->avctx, AV_LOG_DEBUG, "interlaced %d, cur field %d\n", buf[5] & 3, ctx->cur_field);
103
    }
104

    
105
    ctx->height = AV_RB16(buf + 0x18);
106
    ctx->width  = AV_RB16(buf + 0x1a);
107

    
108
    dprintf(ctx->avctx, "width %d, heigth %d\n", ctx->width, ctx->height);
109

    
110
    if (buf[0x21] & 0x40) {
111
        av_log(ctx->avctx, AV_LOG_ERROR, "10 bit per component\n");
112
        return -1;
113
    }
114

    
115
    ctx->cid = AV_RB32(buf + 0x28);
116
    dprintf(ctx->avctx, "compression id %d\n", ctx->cid);
117

    
118
    if (dnxhd_init_vlc(ctx, ctx->cid) < 0)
119
        return -1;
120

    
121
    if (buf_size < ctx->cid_table->coding_unit_size) {
122
        av_log(ctx->avctx, AV_LOG_ERROR, "incorrect frame size\n");
123
        return -1;
124
    }
125

    
126
    ctx->mb_width = ctx->width>>4;
127
    ctx->mb_height = buf[0x16d];
128

    
129
    dprintf(ctx->avctx, "mb width %d, mb height %d\n", ctx->mb_width, ctx->mb_height);
130

    
131
    if ((ctx->height+15)>>4 == ctx->mb_height && ctx->picture.interlaced_frame)
132
        ctx->height <<= 1;
133

    
134
    if (ctx->mb_height > 68 ||
135
        (ctx->mb_height<<ctx->picture.interlaced_frame) > (ctx->height+15)>>4) {
136
        av_log(ctx->avctx, AV_LOG_ERROR, "mb height too big: %d\n", ctx->mb_height);
137
        return -1;
138
    }
139

    
140
    for (i = 0; i < ctx->mb_height; i++) {
141
        ctx->mb_scan_index[i] = AV_RB32(buf + 0x170 + (i<<2));
142
        dprintf(ctx->avctx, "mb scan index %d\n", ctx->mb_scan_index[i]);
143
        if (buf_size < ctx->mb_scan_index[i] + 0x280) {
144
            av_log(ctx->avctx, AV_LOG_ERROR, "invalid mb scan index\n");
145
            return -1;
146
        }
147
    }
148

    
149
    return 0;
150
}
151

    
152
static int dnxhd_decode_dc(DNXHDContext *ctx)
153
{
154
    int len;
155

    
156
    len = get_vlc2(&ctx->gb, ctx->dc_vlc.table, DNXHD_DC_VLC_BITS, 1);
157
    return len ? get_xbits(&ctx->gb, len) : 0;
158
}
159

    
160
static void dnxhd_decode_dct_block(DNXHDContext *ctx, DCTELEM *block, int n, int qscale)
161
{
162
    int i, j, index, index2;
163
    int level, component, sign;
164
    const uint8_t *weigth_matrix;
165

    
166
    if (n&2) {
167
        component = 1 + (n&1);
168
        weigth_matrix = ctx->cid_table->chroma_weight;
169
    } else {
170
        component = 0;
171
        weigth_matrix = ctx->cid_table->luma_weight;
172
    }
173

    
174
    ctx->last_dc[component] += dnxhd_decode_dc(ctx);
175
    block[0] = ctx->last_dc[component];
176
    //av_log(ctx->avctx, AV_LOG_DEBUG, "dc %d\n", block[0]);
177
    for (i = 1; ; i++) {
178
        index = get_vlc2(&ctx->gb, ctx->ac_vlc.table, DNXHD_VLC_BITS, 2);
179
        //av_log(ctx->avctx, AV_LOG_DEBUG, "index %d\n", index);
180
        level = ctx->cid_table->ac_level[index];
181
        if (!level) { /* EOB */
182
            //av_log(ctx->avctx, AV_LOG_DEBUG, "EOB\n");
183
            return;
184
        }
185
        sign = get_sbits(&ctx->gb, 1);
186

    
187
        if (ctx->cid_table->ac_index_flag[index]) {
188
            level += get_bits(&ctx->gb, ctx->cid_table->index_bits)<<6;
189
        }
190

    
191
        if (ctx->cid_table->ac_run_flag[index]) {
192
            index2 = get_vlc2(&ctx->gb, ctx->run_vlc.table, DNXHD_VLC_BITS, 2);
193
            i += ctx->cid_table->run[index2];
194
        }
195

    
196
        if (i > 63) {
197
            av_log(ctx->avctx, AV_LOG_ERROR, "ac tex damaged %d, %d\n", n, i);
198
            return;
199
        }
200

    
201
        j = ctx->scantable.permutated[i];
202
        //av_log(ctx->avctx, AV_LOG_DEBUG, "j %d\n", j);
203
        //av_log(ctx->avctx, AV_LOG_DEBUG, "level %d, weigth %d\n", level, weigth_matrix[i]);
204
        level = (2*level+1) * qscale * weigth_matrix[i];
205
        if (ctx->cid_table->bit_depth == 10) {
206
            if (weigth_matrix[i] != 8)
207
                level += 8;
208
            level >>= 4;
209
        } else {
210
            if (weigth_matrix[i] != 32)
211
                level += 32;
212
            level >>= 6;
213
        }
214
        //av_log(NULL, AV_LOG_DEBUG, "i %d, j %d, end level %d\n", i, j, level);
215
        block[j] = (level^sign) - sign;
216
    }
217
}
218

    
219
static int dnxhd_decode_macroblock(DNXHDContext *ctx, int x, int y)
220
{
221
    int dct_linesize_luma   = ctx->picture.linesize[0];
222
    int dct_linesize_chroma = ctx->picture.linesize[1];
223
    uint8_t *dest_y, *dest_u, *dest_v;
224
    int dct_offset;
225
    int qscale, i;
226

    
227
    qscale = get_bits(&ctx->gb, 11);
228
    skip_bits1(&ctx->gb);
229
    //av_log(ctx->avctx, AV_LOG_DEBUG, "qscale %d\n", qscale);
230

    
231
    for (i = 0; i < 8; i++) {
232
        ctx->dsp.clear_block(ctx->blocks[i]);
233
        dnxhd_decode_dct_block(ctx, ctx->blocks[i], i, qscale);
234
    }
235

    
236
    if (ctx->picture.interlaced_frame) {
237
        dct_linesize_luma   <<= 1;
238
        dct_linesize_chroma <<= 1;
239
    }
240

    
241
    dest_y = ctx->picture.data[0] + ((y * dct_linesize_luma)   << 4) + (x << 4);
242
    dest_u = ctx->picture.data[1] + ((y * dct_linesize_chroma) << 4) + (x << 3);
243
    dest_v = ctx->picture.data[2] + ((y * dct_linesize_chroma) << 4) + (x << 3);
244

    
245
    if (ctx->cur_field) {
246
        dest_y += ctx->picture.linesize[0];
247
        dest_u += ctx->picture.linesize[1];
248
        dest_v += ctx->picture.linesize[2];
249
    }
250

    
251
    dct_offset = dct_linesize_luma << 3;
252
    ctx->dsp.idct_put(dest_y,                  dct_linesize_luma, ctx->blocks[0]);
253
    ctx->dsp.idct_put(dest_y + 8,              dct_linesize_luma, ctx->blocks[1]);
254
    ctx->dsp.idct_put(dest_y + dct_offset,     dct_linesize_luma, ctx->blocks[4]);
255
    ctx->dsp.idct_put(dest_y + dct_offset + 8, dct_linesize_luma, ctx->blocks[5]);
256

    
257
    if (!(ctx->avctx->flags & CODEC_FLAG_GRAY)) {
258
        dct_offset = dct_linesize_chroma << 3;
259
        ctx->dsp.idct_put(dest_u,              dct_linesize_chroma, ctx->blocks[2]);
260
        ctx->dsp.idct_put(dest_v,              dct_linesize_chroma, ctx->blocks[3]);
261
        ctx->dsp.idct_put(dest_u + dct_offset, dct_linesize_chroma, ctx->blocks[6]);
262
        ctx->dsp.idct_put(dest_v + dct_offset, dct_linesize_chroma, ctx->blocks[7]);
263
    }
264

    
265
    return 0;
266
}
267

    
268
static int dnxhd_decode_macroblocks(DNXHDContext *ctx, const uint8_t *buf, int buf_size)
269
{
270
    int x, y;
271
    for (y = 0; y < ctx->mb_height; y++) {
272
        ctx->last_dc[0] =
273
        ctx->last_dc[1] =
274
        ctx->last_dc[2] = 1<<(ctx->cid_table->bit_depth+2); // for levels +2^(bitdepth-1)
275
        init_get_bits(&ctx->gb, buf + ctx->mb_scan_index[y], (buf_size - ctx->mb_scan_index[y]) << 3);
276
        for (x = 0; x < ctx->mb_width; x++) {
277
            //START_TIMER;
278
            dnxhd_decode_macroblock(ctx, x, y);
279
            //STOP_TIMER("decode macroblock");
280
        }
281
    }
282
    return 0;
283
}
284

    
285
static int dnxhd_decode_frame(AVCodecContext *avctx, void *data, int *data_size,
286
                              AVPacket *avpkt)
287
{
288
    const uint8_t *buf = avpkt->data;
289
    int buf_size = avpkt->size;
290
    DNXHDContext *ctx = avctx->priv_data;
291
    AVFrame *picture = data;
292
    int first_field = 1;
293

    
294
    dprintf(avctx, "frame size %d\n", buf_size);
295

    
296
 decode_coding_unit:
297
    if (dnxhd_decode_header(ctx, buf, buf_size, first_field) < 0)
298
        return -1;
299

    
300
    if ((avctx->width || avctx->height) &&
301
        (ctx->width != avctx->width || ctx->height != avctx->height)) {
302
        av_log(avctx, AV_LOG_WARNING, "frame size changed: %dx%d -> %dx%d\n",
303
               avctx->width, avctx->height, ctx->width, ctx->height);
304
        first_field = 1;
305
    }
306

    
307
    avctx->pix_fmt = PIX_FMT_YUV422P;
308
    if (avcodec_check_dimensions(avctx, ctx->width, ctx->height))
309
        return -1;
310
    avcodec_set_dimensions(avctx, ctx->width, ctx->height);
311

    
312
    if (first_field) {
313
        if (ctx->picture.data[0])
314
            avctx->release_buffer(avctx, &ctx->picture);
315
        if (avctx->get_buffer(avctx, &ctx->picture) < 0) {
316
            av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
317
            return -1;
318
        }
319
    }
320

    
321
    dnxhd_decode_macroblocks(ctx, buf + 0x280, buf_size - 0x280);
322

    
323
    if (first_field && ctx->picture.interlaced_frame) {
324
        buf      += ctx->cid_table->coding_unit_size;
325
        buf_size -= ctx->cid_table->coding_unit_size;
326
        first_field = 0;
327
        goto decode_coding_unit;
328
    }
329

    
330
    *picture = ctx->picture;
331
    *data_size = sizeof(AVPicture);
332
    return buf_size;
333
}
334

    
335
static av_cold int dnxhd_decode_close(AVCodecContext *avctx)
336
{
337
    DNXHDContext *ctx = avctx->priv_data;
338

    
339
    if (ctx->picture.data[0])
340
        avctx->release_buffer(avctx, &ctx->picture);
341
    free_vlc(&ctx->ac_vlc);
342
    free_vlc(&ctx->dc_vlc);
343
    free_vlc(&ctx->run_vlc);
344
    return 0;
345
}
346

    
347
AVCodec dnxhd_decoder = {
348
    "dnxhd",
349
    AVMEDIA_TYPE_VIDEO,
350
    CODEC_ID_DNXHD,
351
    sizeof(DNXHDContext),
352
    dnxhd_decode_init,
353
    NULL,
354
    dnxhd_decode_close,
355
    dnxhd_decode_frame,
356
    CODEC_CAP_DR1,
357
    .long_name = NULL_IF_CONFIG_SMALL("VC3/DNxHD"),
358
};