libavcodec/libdirac_libschro.c

   1 /*
   2  * Copyright (c) 2008 BBC, Anuradha Suraparaju <asuraparaju at gmail dot com >
   3  *
   4  * This file is part of FFmpeg.
   5  *
   6  * FFmpeg is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * FFmpeg is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with FFmpeg; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  19  */
  20
  21 /**
  22 * @file libdirac_libschro.c
  23 * functions common to libdirac and libschroedinger
  24 */
  25
  26 #include "libdirac_libschro.h"
  27
  28 static const FfmpegDiracSchroVideoFormatInfo ff_dirac_schro_video_format_info[] = {
  29     { 640,  480,  24000, 1001},
  30     { 176,  120,  15000, 1001},
  31     { 176,  144,  25,    2   },
  32     { 352,  240,  15000, 1001},
  33     { 352,  288,  25,    2   },
  34     { 704,  480,  15000, 1001},
  35     { 704,  576,  25,    2   },
  36     { 720,  480,  30000, 1001},
  37     { 720,  576,  25,    1   },
  38     { 1280, 720,  60000, 1001},
  39     { 1280, 720,  50,    1   },
  40     { 1920, 1080, 30000, 1001},
  41     { 1920, 1080, 25,    1   },
  42     { 1920, 1080, 60000, 1001},
  43     { 1920, 1080, 50,    1   },
  44     { 2048, 1080, 24,    1   },
  45     { 4096, 2160, 24,    1   },
  46 };
  47
  48 unsigned int ff_dirac_schro_get_video_format_idx (AVCodecContext *avccontext)
  49 {
  50     unsigned int ret_idx = 0;
  51     unsigned int idx;
  52     unsigned int num_formats = sizeof(ff_dirac_schro_video_format_info) /
  53                                sizeof(ff_dirac_schro_video_format_info[0]);
  54
  55     for (idx = 1 ; idx < num_formats; ++idx ) {
  56         const FfmpegDiracSchroVideoFormatInfo *vf =
  57                                         &ff_dirac_schro_video_format_info[idx];
  58         if (avccontext->width  == vf->width &&
  59             avccontext->height == vf->height){
  60             ret_idx = idx;
  61             if (avccontext->time_base.den == vf->frame_rate_num &&
  62                 avccontext->time_base.num == vf->frame_rate_denom) {
  63                 return idx;
  64             }
  65         }
  66     }
  67     return ret_idx;
  68 }
  69
  70 void ff_dirac_schro_queue_init (FfmpegDiracSchroQueue *queue)
  71 {
  72     queue->p_head = queue->p_tail = NULL;
  73     queue->size = 0;
  74 }
  75
  76 void ff_dirac_schro_queue_free (FfmpegDiracSchroQueue *queue,
  77                                 void (*free_func)(void *))
  78 {
  79     while (queue->p_head) {
  80         free_func( ff_dirac_schro_queue_pop(queue) );
  81     }
  82 }
  83
  84 int ff_dirac_schro_queue_push_back (FfmpegDiracSchroQueue *queue, void *p_data)
  85 {
  86     FfmpegDiracSchroQueueElement *p_new =
  87                              av_mallocz(sizeof(FfmpegDiracSchroQueueElement));
  88
  89     if (p_new == NULL)
  90         return -1;
  91
  92     p_new->data = p_data;
  93
  94     if (queue->p_head == NULL)
  95         queue->p_head = p_new;
  96     else
  97         queue->p_tail->next = p_new;
  98     queue->p_tail = p_new;
  99
 100     ++queue->size;
 101     return 0;
 102 }
 103
 104 void *ff_dirac_schro_queue_pop (FfmpegDiracSchroQueue *queue)
 105 {
 106     FfmpegDiracSchroQueueElement *top = queue->p_head;
 107
 108     if (top != NULL) {
 109         void *data = top->data;
 110         queue->p_head = queue->p_head->next;
 111         --queue->size;
 112         av_freep (&top);
 113         return data;
 114     }
 115
 116     return NULL;
 117 }