1/*
2 * Copyright (C) 2007 Marco Gerards <marco@gnu.org>
3 * Copyright (C) 2009 David Conrad
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/**
23 * @file
24 * Dirac Decoder
25 * @author Marco Gerards <marco@gnu.org>
26 */
27
28#include "dirac.h"
29#include "avcodec.h"
30#include "golomb.h"
31#include "mpeg12data.h"
32
33// defaults for source parameters
34static const dirac_source_params dirac_source_parameters_defaults[] = {
35    { 640,  480,  2, 0, 0, 1,  1, 640,  480,  0, 0, 1, 0 },
36    { 176,  120,  2, 0, 0, 9,  2, 176,  120,  0, 0, 1, 1 },
37    { 176,  144,  2, 0, 1, 10, 3, 176,  144,  0, 0, 1, 2 },
38    { 352,  240,  2, 0, 0, 9,  2, 352,  240,  0, 0, 1, 1 },
39    { 352,  288,  2, 0, 1, 10, 3, 352,  288,  0, 0, 1, 2 },
40    { 704,  480,  2, 0, 0, 9,  2, 704,  480,  0, 0, 1, 1 },
41    { 704,  576,  2, 0, 1, 10, 3, 704,  576,  0, 0, 1, 2 },
42    { 720,  480,  1, 1, 0, 4,  2, 704,  480,  8, 0, 3, 1 },
43    { 720,  576,  1, 1, 1, 3,  3, 704,  576,  8, 0, 3, 2 },
44
45    { 1280, 720,  1, 0, 1, 7,  1, 1280, 720,  0, 0, 3, 3 },
46    { 1280, 720,  1, 0, 1, 6,  1, 1280, 720,  0, 0, 3, 3 },
47    { 1920, 1080, 1, 1, 1, 4,  1, 1920, 1080, 0, 0, 3, 3 },
48    { 1920, 1080, 1, 1, 1, 3,  1, 1920, 1080, 0, 0, 3, 3 },
49    { 1920, 1080, 1, 0, 1, 7,  1, 1920, 1080, 0, 0, 3, 3 },
50    { 1920, 1080, 1, 0, 1, 6,  1, 1920, 1080, 0, 0, 3, 3 },
51    { 2048, 1080, 0, 0, 1, 2,  1, 2048, 1080, 0, 0, 4, 4 },
52    { 4096, 2160, 0, 0, 1, 2,  1, 4096, 2160, 0, 0, 4, 4 },
53
54    { 3840, 2160, 1, 0, 1, 7,  1, 3840, 2160, 0, 0, 3, 3 },
55    { 3840, 2160, 1, 0, 1, 6,  1, 3840, 2160, 0, 0, 3, 3 },
56    { 7680, 4320, 1, 0, 1, 7,  1, 3840, 2160, 0, 0, 3, 3 },
57    { 7680, 4320, 1, 0, 1, 6,  1, 3840, 2160, 0, 0, 3, 3 },
58};
59
60static const AVRational dirac_preset_aspect_ratios[] = {
61    {1, 1},
62    {10, 11},
63    {12, 11},
64    {40, 33},
65    {16, 11},
66    {4, 3},
67};
68
69static const AVRational dirac_frame_rate[] = {
70    {15000, 1001},
71    {25, 2},
72};
73
74static const struct {
75    uint8_t             bitdepth;
76    enum AVColorRange   color_range;
77} pixel_range_presets[] = {
78    {8,  AVCOL_RANGE_JPEG},
79    {8,  AVCOL_RANGE_MPEG},
80    {10, AVCOL_RANGE_MPEG},
81    {12, AVCOL_RANGE_MPEG},
82};
83
84static const enum AVColorPrimaries dirac_primaries[] = {
85    AVCOL_PRI_BT709,
86    AVCOL_PRI_SMPTE170M,
87    AVCOL_PRI_BT470BG,
88};
89
90static const struct {
91    enum AVColorPrimaries color_primaries;
92    enum AVColorSpace colorspace;
93    enum AVColorTransferCharacteristic color_trc;
94} dirac_color_presets[] = {
95    { AVCOL_PRI_BT709,     AVCOL_SPC_BT709,   AVCOL_TRC_BT709 },
96    { AVCOL_PRI_SMPTE170M, AVCOL_SPC_BT470BG, AVCOL_TRC_BT709 },
97    { AVCOL_PRI_BT470BG,   AVCOL_SPC_BT470BG, AVCOL_TRC_BT709 },
98    { AVCOL_PRI_BT709,     AVCOL_SPC_BT709,   AVCOL_TRC_BT709 },
99    { AVCOL_PRI_BT709,     AVCOL_SPC_BT709,   AVCOL_TRC_UNSPECIFIED /* DCinema */ },
100};
101
102static const enum PixelFormat dirac_pix_fmt[2][3] = {
103    { PIX_FMT_YUV444P,  PIX_FMT_YUV422P,  PIX_FMT_YUV420P  },
104    { PIX_FMT_YUVJ444P, PIX_FMT_YUVJ422P, PIX_FMT_YUVJ420P },
105};
106
107static int parse_source_parameters(AVCodecContext *avctx, GetBitContext *gb,
108                                   dirac_source_params *source)
109{
110    AVRational frame_rate = (AVRational){0,0};
111    unsigned luma_depth = 8, luma_offset = 16;
112    int idx;
113
114    if (get_bits1(gb)) {
115        source->width  = svq3_get_ue_golomb(gb);
116        source->height = svq3_get_ue_golomb(gb);
117    }
118
119    // chroma subsampling
120    if (get_bits1(gb))
121        source->chroma_format = svq3_get_ue_golomb(gb);
122    if (source->chroma_format > 2) {
123        av_log(avctx, AV_LOG_ERROR, "Unknown chroma format %d\n",
124               source->chroma_format);
125        return -1;
126    }
127
128    if (get_bits1(gb))
129        source->interlaced = svq3_get_ue_golomb(gb);
130    if (source->interlaced > 1)
131        return -1;
132
133    // frame rate
134    if (get_bits1(gb)) {
135        source->frame_rate_index = svq3_get_ue_golomb(gb);
136
137        if (source->frame_rate_index > 10)
138            return -1;
139
140        if (!source->frame_rate_index) {
141            frame_rate.num = svq3_get_ue_golomb(gb);
142            frame_rate.den = svq3_get_ue_golomb(gb);
143        }
144    }
145    if (source->frame_rate_index > 0) {
146        if (source->frame_rate_index <= 8)
147            frame_rate = ff_frame_rate_tab[source->frame_rate_index];
148        else
149            frame_rate = dirac_frame_rate[source->frame_rate_index-9];
150    }
151    av_reduce(&avctx->time_base.num, &avctx->time_base.den,
152              frame_rate.den, frame_rate.num, 1<<30);
153
154    // aspect ratio
155    if (get_bits1(gb)) {
156        source->aspect_ratio_index = svq3_get_ue_golomb(gb);
157
158        if (source->aspect_ratio_index > 6)
159            return -1;
160
161        if (!source->aspect_ratio_index) {
162            avctx->sample_aspect_ratio.num = svq3_get_ue_golomb(gb);
163            avctx->sample_aspect_ratio.den = svq3_get_ue_golomb(gb);
164        }
165    }
166    if (source->aspect_ratio_index > 0)
167        avctx->sample_aspect_ratio =
168                dirac_preset_aspect_ratios[source->aspect_ratio_index-1];
169
170    if (get_bits1(gb)) {
171        source->clean_width        = svq3_get_ue_golomb(gb);
172        source->clean_height       = svq3_get_ue_golomb(gb);
173        source->clean_left_offset  = svq3_get_ue_golomb(gb);
174        source->clean_right_offset = svq3_get_ue_golomb(gb);
175    }
176
177    // Override signal range.
178    if (get_bits1(gb)) {
179        source->pixel_range_index = svq3_get_ue_golomb(gb);
180
181        if (source->pixel_range_index > 4)
182            return -1;
183
184        // This assumes either fullrange or MPEG levels only
185        if (!source->pixel_range_index) {
186            luma_offset = svq3_get_ue_golomb(gb);
187            luma_depth  = av_log2(svq3_get_ue_golomb(gb))+1;
188            svq3_get_ue_golomb(gb); // chroma offset
189            svq3_get_ue_golomb(gb); // chroma excursion
190
191            avctx->color_range = luma_offset ? AVCOL_RANGE_MPEG : AVCOL_RANGE_JPEG;
192        }
193    }
194    if (source->pixel_range_index > 0) {
195        idx                = source->pixel_range_index-1;
196        luma_depth         = pixel_range_presets[idx].bitdepth;
197        avctx->color_range = pixel_range_presets[idx].color_range;
198    }
199
200    if (luma_depth > 8)
201        av_log(avctx, AV_LOG_WARNING, "Bitdepth greater than 8");
202
203    avctx->pix_fmt = dirac_pix_fmt[!luma_offset][source->chroma_format];
204
205    // color spec
206    if (get_bits1(gb)) {
207        idx = source->color_spec_index = svq3_get_ue_golomb(gb);
208
209        if (source->color_spec_index > 4)
210            return -1;
211
212        avctx->color_primaries = dirac_color_presets[idx].color_primaries;
213        avctx->colorspace      = dirac_color_presets[idx].colorspace;
214        avctx->color_trc       = dirac_color_presets[idx].color_trc;
215
216        if (!source->color_spec_index) {
217            if (get_bits1(gb)) {
218                idx = svq3_get_ue_golomb(gb);
219                if (idx < 3)
220                    avctx->color_primaries = dirac_primaries[idx];
221            }
222
223            if (get_bits1(gb)) {
224                idx = svq3_get_ue_golomb(gb);
225                if (!idx)
226                    avctx->colorspace = AVCOL_SPC_BT709;
227                else if (idx == 1)
228                    avctx->colorspace = AVCOL_SPC_BT470BG;
229            }
230
231            if (get_bits1(gb) && !svq3_get_ue_golomb(gb))
232                avctx->color_trc = AVCOL_TRC_BT709;
233        }
234    } else {
235        idx = source->color_spec_index;
236        avctx->color_primaries = dirac_color_presets[idx].color_primaries;
237        avctx->colorspace      = dirac_color_presets[idx].colorspace;
238        avctx->color_trc       = dirac_color_presets[idx].color_trc;
239    }
240
241    return 0;
242}
243
244int ff_dirac_parse_sequence_header(AVCodecContext *avctx, GetBitContext *gb,
245                                   dirac_source_params *source)
246{
247    unsigned version_major, version_minor;
248    unsigned video_format, picture_coding_mode;
249
250    version_major  = svq3_get_ue_golomb(gb);
251    version_minor  = svq3_get_ue_golomb(gb);
252    avctx->profile = svq3_get_ue_golomb(gb);
253    avctx->level   = svq3_get_ue_golomb(gb);
254    video_format   = svq3_get_ue_golomb(gb);
255
256    if (version_major < 2)
257        av_log(avctx, AV_LOG_WARNING, "Stream is old and may not work\n");
258    else if (version_major > 2)
259        av_log(avctx, AV_LOG_WARNING, "Stream may have unhandled features\n");
260
261    if (video_format > 20)
262        return -1;
263
264    // Fill in defaults for the source parameters.
265    *source = dirac_source_parameters_defaults[video_format];
266
267    // Override the defaults.
268    if (parse_source_parameters(avctx, gb, source))
269        return -1;
270
271    if (avcodec_check_dimensions(avctx, source->width, source->height))
272        return -1;
273
274    avcodec_set_dimensions(avctx, source->width, source->height);
275
276    // currently only used to signal field coding
277    picture_coding_mode = svq3_get_ue_golomb(gb);
278    if (picture_coding_mode != 0) {
279        av_log(avctx, AV_LOG_ERROR, "Unsupported picture coding mode %d",
280               picture_coding_mode);
281        return -1;
282    }
283    return 0;
284}
285