libavcodec/ffv1.c

   1 /*
   2  * FFV1 codec for libavcodec
   3  *
   4  * Copyright (c) 2003-2013 Michael Niedermayer <michaelni@gmx.at>
   5  *
   6  * This file is part of FFmpeg.
   7  *
   8  * FFmpeg is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU Lesser General Public
  10  * License as published by the Free Software Foundation; either
  11  * version 2.1 of the License, or (at your option) any later version.
  12  *
  13  * FFmpeg is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  * Lesser General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU Lesser General Public
  19  * License along with FFmpeg; if not, write to the Free Software
  20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  21  */
  22
  23 /**
  24  * @file
  25  * FF Video Codec 1 (a lossless codec)
  26  */
  27
  28 #include "libavutil/attributes.h"
  29 #include "libavutil/avassert.h"
  30
  31 #include "avcodec.h"
  32 #include "rangecoder.h"
  33 #include "ffv1.h"
  34 #include "threadframe.h"
  35
  36 av_cold int ff_ffv1_common_init(AVCodecContext *avctx)
  37 {
  38     FFV1Context *s = avctx->priv_data;
  39
  40     if (!avctx->width || !avctx->height)
  41         return AVERROR_INVALIDDATA;
  42
  43     s->avctx = avctx;
  44     s->flags = avctx->flags;
  45
  46     s->picture.f = av_frame_alloc();
  47     s->last_picture.f = av_frame_alloc();
  48     if (!s->picture.f || !s->last_picture.f)
  49         return AVERROR(ENOMEM);
  50
  51     s->width  = avctx->width;
  52     s->height = avctx->height;
  53
  54     // defaults
  55     s->num_h_slices = 1;
  56     s->num_v_slices = 1;
  57
  58     return 0;
  59 }
  60
  61 av_cold int ff_ffv1_init_slice_state(const FFV1Context *f, FFV1Context *fs)
  62 {
  63     int j, i;
  64
  65     fs->plane_count  = f->plane_count;
  66     fs->transparency = f->transparency;
  67     for (j = 0; j < f->plane_count; j++) {
  68         PlaneContext *const p = &fs->plane[j];
  69
  70         if (fs->ac != AC_GOLOMB_RICE) {
  71             if (!p->state)
  72                 p->state = av_calloc(p->context_count, CONTEXT_SIZE *
  73                                      sizeof(uint8_t));
  74             if (!p->state)
  75                 return AVERROR(ENOMEM);
  76         } else {
  77             if (!p->vlc_state) {
  78                 p->vlc_state = av_calloc(p->context_count, sizeof(*p->vlc_state));
  79                 if (!p->vlc_state)
  80                     return AVERROR(ENOMEM);
  81                 for (i = 0; i < p->context_count; i++) {
  82                     p->vlc_state[i].error_sum = 4;
  83                     p->vlc_state[i].count     = 1;
  84                 }
  85             }
  86         }
  87     }
  88
  89     if (fs->ac == AC_RANGE_CUSTOM_TAB) {
  90         //FIXME only redo if state_transition changed
  91         for (j = 1; j < 256; j++) {
  92             fs->c. one_state[      j] = f->state_transition[j];
  93             fs->c.zero_state[256 - j] = 256 - fs->c.one_state[j];
  94         }
  95     }
  96
  97     return 0;
  98 }
  99
 100 av_cold int ff_ffv1_init_slices_state(FFV1Context *f)
 101 {
 102     int i, ret;
 103     for (i = 0; i < f->max_slice_count; i++) {
 104         FFV1Context *fs = f->slice_context[i];
 105         if ((ret = ff_ffv1_init_slice_state(f, fs)) < 0)
 106             return AVERROR(ENOMEM);
 107     }
 108     return 0;
 109 }
 110
 111 int ff_need_new_slices(int width, int num_h_slices, int chroma_shift) {
 112     int mpw = 1<<chroma_shift;
 113     int i = width * (int64_t)(num_h_slices - 1) / num_h_slices;
 114
 115     return width % mpw && (width - i) % mpw == 0;
 116 }
 117
 118 av_cold int ff_ffv1_init_slice_contexts(FFV1Context *f)
 119 {
 120     int i, max_slice_count = f->num_h_slices * f->num_v_slices;
 121
 122     av_assert0(max_slice_count > 0);
 123
 124     for (i = 0; i < max_slice_count;) {
 125         int sx          = i % f->num_h_slices;
 126         int sy          = i / f->num_h_slices;
 127         int sxs         = f->avctx->width  *  sx      / f->num_h_slices;
 128         int sxe         = f->avctx->width  * (sx + 1) / f->num_h_slices;
 129         int sys         = f->avctx->height *  sy      / f->num_v_slices;
 130         int sye         = f->avctx->height * (sy + 1) / f->num_v_slices;
 131         FFV1Context *fs = av_mallocz(sizeof(*fs));
 132
 133         if (!fs)
 134             goto memfail;
 135
 136         f->slice_context[i++] = fs;
 137         memcpy(fs, f, sizeof(*fs));
 138         memset(fs->rc_stat2, 0, sizeof(fs->rc_stat2));
 139
 140         fs->slice_width  = sxe - sxs;
 141         fs->slice_height = sye - sys;
 142         fs->slice_x      = sxs;
 143         fs->slice_y      = sys;
 144
 145         fs->sample_buffer = av_malloc_array((fs->width + 6), 3 * MAX_PLANES *
 146                                       sizeof(*fs->sample_buffer));
 147         fs->sample_buffer32 = av_malloc_array((fs->width + 6), 3 * MAX_PLANES *
 148                                         sizeof(*fs->sample_buffer32));
 149         if (!fs->sample_buffer || !fs->sample_buffer32)
 150             goto memfail;
 151     }
 152     f->max_slice_count = max_slice_count;
 153     return 0;
 154
 155 memfail:
 156     f->max_slice_count = i;
 157     return AVERROR(ENOMEM);
 158 }
 159
 160 int ff_ffv1_allocate_initial_states(FFV1Context *f)
 161 {
 162     int i;
 163
 164     for (i = 0; i < f->quant_table_count; i++) {
 165         f->initial_states[i] = av_malloc_array(f->context_count[i],
 166                                          sizeof(*f->initial_states[i]));
 167         if (!f->initial_states[i])
 168             return AVERROR(ENOMEM);
 169         memset(f->initial_states[i], 128,
 170                f->context_count[i] * sizeof(*f->initial_states[i]));
 171     }
 172     return 0;
 173 }
 174
 175 void ff_ffv1_clear_slice_state(const FFV1Context *f, FFV1Context *fs)
 176 {
 177     int i, j;
 178
 179     for (i = 0; i < f->plane_count; i++) {
 180         PlaneContext *p = &fs->plane[i];
 181
 182         p->interlace_bit_state[0] = 128;
 183         p->interlace_bit_state[1] = 128;
 184
 185         if (fs->ac != AC_GOLOMB_RICE) {
 186             if (f->initial_states[p->quant_table_index]) {
 187                 memcpy(p->state, f->initial_states[p->quant_table_index],
 188                        CONTEXT_SIZE * p->context_count);
 189             } else
 190                 memset(p->state, 128, CONTEXT_SIZE * p->context_count);
 191         } else {
 192             for (j = 0; j < p->context_count; j++) {
 193                 p->vlc_state[j].drift     = 0;
 194                 p->vlc_state[j].error_sum = 4;    //FFMAX((RANGE + 32)/64, 2);
 195                 p->vlc_state[j].bias      = 0;
 196                 p->vlc_state[j].count     = 1;
 197             }
 198         }
 199     }
 200 }
 201
 202
 203 av_cold int ff_ffv1_close(AVCodecContext *avctx)
 204 {
 205     FFV1Context *s = avctx->priv_data;
 206     int i, j;
 207
 208     if (s->picture.f)
 209         ff_thread_release_ext_buffer(avctx, &s->picture);
 210     av_frame_free(&s->picture.f);
 211
 212     if (s->last_picture.f)
 213         ff_thread_release_ext_buffer(avctx, &s->last_picture);
 214     av_frame_free(&s->last_picture.f);
 215
 216     for (j = 0; j < s->max_slice_count; j++) {
 217         FFV1Context *fs = s->slice_context[j];
 218         for (i = 0; i < s->plane_count; i++) {
 219             PlaneContext *p = &fs->plane[i];
 220
 221             av_freep(&p->state);
 222             av_freep(&p->vlc_state);
 223         }
 224         av_freep(&fs->sample_buffer);
 225         av_freep(&fs->sample_buffer32);
 226     }
 227
 228     av_freep(&avctx->stats_out);
 229     for (j = 0; j < s->quant_table_count; j++) {
 230         av_freep(&s->initial_states[j]);
 231         for (i = 0; i < s->max_slice_count; i++) {
 232             FFV1Context *sf = s->slice_context[i];
 233             av_freep(&sf->rc_stat2[j]);
 234         }
 235         av_freep(&s->rc_stat2[j]);
 236     }
 237
 238     for (i = 0; i < s->max_slice_count; i++)
 239         av_freep(&s->slice_context[i]);
 240
 241     return 0;
 242 }