Print a warning message when avcodec_default_free_buffers finds unreleased
[libav.git] / libavcodec / wnv1.c
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1/*
2 * Winnov WNV1 codec
3 * Copyright (c) 2005 Konstantin Shishkov
4 *
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5 * This file is part of FFmpeg.
6 *
7 * FFmpeg is free software; you can redistribute it and/or
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8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
b78e7197 10 * version 2.1 of the License, or (at your option) any later version.
a8a15e9d 11 *
b78e7197 12 * FFmpeg is distributed in the hope that it will be useful,
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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
b78e7197 18 * License along with FFmpeg; if not, write to the Free Software
5509bffa 19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
a8a15e9d 20 */
115329f1 21
a8a15e9d 22/**
bad5537e 23 * @file libavcodec/wnv1.c
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24 * Winnov WNV1 codec.
25 */
115329f1 26
a8a15e9d 27#include "avcodec.h"
9106a698 28#include "get_bits.h"
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29
30
31typedef struct WNV1Context{
32 AVCodecContext *avctx;
33 AVFrame pic;
34
35 int shift;
083b80b5 36 GetBitContext gb;
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37} WNV1Context;
38
cf2baeb3 39static const uint16_t code_tab[16][2]={
083b80b5 40{0x1FD,9}, {0xFD,8}, {0x7D,7}, {0x3D,6}, {0x1D,5}, {0x0D,4}, {0x005,3},
115329f1 41{0x000,1},
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42{0x004,3}, {0x0C,4}, {0x1C,5}, {0x3C,6}, {0x7C,7}, {0xFC,8}, {0x1FC,9}, {0xFF,8}
43};
44
45#define CODE_VLC_BITS 9
46static VLC code_vlc;
47
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48/* returns modified base_value */
49static inline int wnv1_get_code(WNV1Context *w, int base_value)
50{
083b80b5 51 int v = get_vlc2(&w->gb, code_vlc.table, CODE_VLC_BITS, 1);
a8a15e9d 52
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53 if(v==15)
54 return ff_reverse[ get_bits(&w->gb, 8 - w->shift) ];
55 else
56 return base_value + ((v - 7)<<w->shift);
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57}
58
115329f1 59static int decode_frame(AVCodecContext *avctx,
a8a15e9d 60 void *data, int *data_size,
7a00bbad 61 AVPacket *avpkt)
a8a15e9d 62{
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63 const uint8_t *buf = avpkt->data;
64 int buf_size = avpkt->size;
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65 WNV1Context * const l = avctx->priv_data;
66 AVFrame * const p= (AVFrame*)&l->pic;
67 unsigned char *Y,*U,*V;
68 int i, j;
69 int prev_y = 0, prev_u = 0, prev_v = 0;
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70 uint8_t *rbuf;
71
72 rbuf = av_malloc(buf_size + FF_INPUT_BUFFER_PADDING_SIZE);
73 if(!rbuf){
74 av_log(avctx, AV_LOG_ERROR, "Cannot allocate temporary buffer\n");
75 return -1;
76 }
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77
78 if(p->data[0])
79 avctx->release_buffer(avctx, p);
80
81 p->reference = 0;
82 if(avctx->get_buffer(avctx, p) < 0){
83 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
b7093975 84 av_free(rbuf);
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85 return -1;
86 }
87 p->key_frame = 1;
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88
89 for(i=8; i<buf_size; i++)
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90 rbuf[i]= ff_reverse[ buf[i] ];
91 init_get_bits(&l->gb, rbuf+8, (buf_size-8)*8);
083b80b5 92
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93 if (buf[2] >> 4 == 6)
94 l->shift = 2;
95 else {
96 l->shift = 8 - (buf[2] >> 4);
97 if (l->shift > 4) {
98 av_log(avctx, AV_LOG_ERROR, "Unknown WNV1 frame header value %i, please upload file for study\n", buf[2] >> 4);
99 l->shift = 4;
100 }
101 if (l->shift < 1) {
102 av_log(avctx, AV_LOG_ERROR, "Unknown WNV1 frame header value %i, please upload file for study\n", buf[2] >> 4);
103 l->shift = 1;
104 }
105 }
115329f1 106
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107 Y = p->data[0];
108 U = p->data[1];
109 V = p->data[2];
110 for (j = 0; j < avctx->height; j++) {
111 for (i = 0; i < avctx->width / 2; i++) {
112 Y[i * 2] = wnv1_get_code(l, prev_y);
113 prev_u = U[i] = wnv1_get_code(l, prev_u);
114 prev_y = Y[(i * 2) + 1] = wnv1_get_code(l, Y[i * 2]);
115 prev_v = V[i] = wnv1_get_code(l, prev_v);
116 }
117 Y += p->linesize[0];
118 U += p->linesize[1];
119 V += p->linesize[2];
120 }
121
115329f1 122
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123 *data_size = sizeof(AVFrame);
124 *(AVFrame*)data = l->pic;
b7093975 125 av_free(rbuf);
115329f1 126
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127 return buf_size;
128}
129
98a6fff9 130static av_cold int decode_init(AVCodecContext *avctx){
a8a15e9d 131 WNV1Context * const l = avctx->priv_data;
bd4110f9 132 static VLC_TYPE code_table[1 << CODE_VLC_BITS][2];
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133
134 l->avctx = avctx;
135 avctx->pix_fmt = PIX_FMT_YUV422P;
136
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137 code_vlc.table = code_table;
138 code_vlc.table_allocated = 1 << CODE_VLC_BITS;
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139 init_vlc(&code_vlc, CODE_VLC_BITS, 16,
140 &code_tab[0][1], 4, 2,
141 &code_tab[0][0], 4, 2, INIT_VLC_USE_NEW_STATIC);
083b80b5 142
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143 return 0;
144}
145
146AVCodec wnv1_decoder = {
147 "wnv1",
148 CODEC_TYPE_VIDEO,
149 CODEC_ID_WNV1,
150 sizeof(WNV1Context),
151 decode_init,
152 NULL,
153 NULL,
154 decode_frame,
155 CODEC_CAP_DR1,
fe4bf374 156 .long_name = NULL_IF_CONFIG_SMALL("Winnov WNV1"),
a8a15e9d 157};