* Winnov WNV1 codec
* Copyright (c) 2005 Konstantin Shishkov
*
- * This file is part of FFmpeg.
+ * This file is part of Libav.
*
- * FFmpeg is free software; you can redistribute it and/or
+ * Libav is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
- * FFmpeg is distributed in the hope that it will be useful,
+ * Libav is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
- * License along with FFmpeg; if not, write to the Free Software
+ * License along with Libav; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
- * @file libavcodec/wnv1.c
+ * @file
* Winnov WNV1 codec.
*/
#include "avcodec.h"
#include "get_bits.h"
+#include "internal.h"
+#include "mathops.h"
-typedef struct WNV1Context{
+typedef struct WNV1Context {
AVCodecContext *avctx;
- AVFrame pic;
int shift;
GetBitContext gb;
} WNV1Context;
-static const uint16_t code_tab[16][2]={
-{0x1FD,9}, {0xFD,8}, {0x7D,7}, {0x3D,6}, {0x1D,5}, {0x0D,4}, {0x005,3},
-{0x000,1},
-{0x004,3}, {0x0C,4}, {0x1C,5}, {0x3C,6}, {0x7C,7}, {0xFC,8}, {0x1FC,9}, {0xFF,8}
+static const uint16_t code_tab[16][2] = {
+ { 0x1FD, 9 }, { 0xFD, 8 }, { 0x7D, 7 }, { 0x3D, 6 }, { 0x1D, 5 }, { 0x0D, 4 }, { 0x005, 3 },
+ { 0x000, 1 },
+ { 0x004, 3 }, { 0x0C, 4 }, { 0x1C, 5 }, { 0x3C, 6 }, { 0x7C, 7 }, { 0xFC, 8 }, { 0x1FC, 9 }, { 0xFF, 8 }
};
#define CODE_VLC_BITS 9
{
int v = get_vlc2(&w->gb, code_vlc.table, CODE_VLC_BITS, 1);
- if(v==15)
- return ff_reverse[ get_bits(&w->gb, 8 - w->shift) ];
+ if (v == 15)
+ return ff_reverse[get_bits(&w->gb, 8 - w->shift)];
else
- return base_value + ((v - 7)<<w->shift);
+ return base_value + ((v - 7) << w->shift);
}
static int decode_frame(AVCodecContext *avctx,
- void *data, int *data_size,
+ void *data, int *got_frame,
AVPacket *avpkt)
{
- const uint8_t *buf = avpkt->data;
- int buf_size = avpkt->size;
WNV1Context * const l = avctx->priv_data;
- AVFrame * const p= (AVFrame*)&l->pic;
+ const uint8_t *buf = avpkt->data;
+ int buf_size = avpkt->size;
+ AVFrame * const p = data;
unsigned char *Y,*U,*V;
- int i, j;
+ int i, j, ret;
int prev_y = 0, prev_u = 0, prev_v = 0;
uint8_t *rbuf;
- rbuf = av_malloc(buf_size + FF_INPUT_BUFFER_PADDING_SIZE);
- if(!rbuf){
- av_log(avctx, AV_LOG_ERROR, "Cannot allocate temporary buffer\n");
- return -1;
+ if (buf_size < 8) {
+ av_log(avctx, AV_LOG_ERROR, "Packet is too short\n");
+ return AVERROR_INVALIDDATA;
}
- if(p->data[0])
- avctx->release_buffer(avctx, p);
+ rbuf = av_malloc(buf_size + AV_INPUT_BUFFER_PADDING_SIZE);
+ if (!rbuf) {
+ av_log(avctx, AV_LOG_ERROR, "Cannot allocate temporary buffer\n");
+ return AVERROR(ENOMEM);
+ }
- p->reference = 0;
- if(avctx->get_buffer(avctx, p) < 0){
+ if ((ret = ff_get_buffer(avctx, p, 0)) < 0) {
av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
av_free(rbuf);
- return -1;
+ return ret;
}
p->key_frame = 1;
- for(i=8; i<buf_size; i++)
- rbuf[i]= ff_reverse[ buf[i] ];
- init_get_bits(&l->gb, rbuf+8, (buf_size-8)*8);
+ for (i = 8; i < buf_size; i++)
+ rbuf[i] = ff_reverse[buf[i]];
+ init_get_bits(&l->gb, rbuf + 8, (buf_size - 8) * 8);
if (buf[2] >> 4 == 6)
l->shift = 2;
else {
l->shift = 8 - (buf[2] >> 4);
if (l->shift > 4) {
- av_log(avctx, AV_LOG_ERROR, "Unknown WNV1 frame header value %i, please upload file for study\n", buf[2] >> 4);
+ avpriv_request_sample(avctx,
+ "Unknown WNV1 frame header value %i",
+ buf[2] >> 4);
l->shift = 4;
}
if (l->shift < 1) {
- av_log(avctx, AV_LOG_ERROR, "Unknown WNV1 frame header value %i, please upload file for study\n", buf[2] >> 4);
+ avpriv_request_sample(avctx,
+ "Unknown WNV1 frame header value %i",
+ buf[2] >> 4);
l->shift = 1;
}
}
}
- *data_size = sizeof(AVFrame);
- *(AVFrame*)data = l->pic;
+ *got_frame = 1;
av_free(rbuf);
return buf_size;
}
-static av_cold int decode_init(AVCodecContext *avctx){
+static av_cold int decode_init(AVCodecContext *avctx)
+{
WNV1Context * const l = avctx->priv_data;
static VLC_TYPE code_table[1 << CODE_VLC_BITS][2];
- l->avctx = avctx;
- avctx->pix_fmt = PIX_FMT_YUV422P;
+ l->avctx = avctx;
+ avctx->pix_fmt = AV_PIX_FMT_YUV422P;
- code_vlc.table = code_table;
+ code_vlc.table = code_table;
code_vlc.table_allocated = 1 << CODE_VLC_BITS;
init_vlc(&code_vlc, CODE_VLC_BITS, 16,
&code_tab[0][1], 4, 2,
return 0;
}
-static av_cold int decode_end(AVCodecContext *avctx){
- WNV1Context * const l = avctx->priv_data;
- AVFrame *pic = &l->pic;
-
- if (pic->data[0])
- avctx->release_buffer(avctx, pic);
- av_freep(&l->pic);
-
- return 0;
-}
-
-AVCodec wnv1_decoder = {
- "wnv1",
- CODEC_TYPE_VIDEO,
- CODEC_ID_WNV1,
- sizeof(WNV1Context),
- decode_init,
- NULL,
- decode_end,
- decode_frame,
- CODEC_CAP_DR1,
- .long_name = NULL_IF_CONFIG_SMALL("Winnov WNV1"),
+AVCodec ff_wnv1_decoder = {
+ .name = "wnv1",
+ .long_name = NULL_IF_CONFIG_SMALL("Winnov WNV1"),
+ .type = AVMEDIA_TYPE_VIDEO,
+ .id = AV_CODEC_ID_WNV1,
+ .priv_data_size = sizeof(WNV1Context),
+ .init = decode_init,
+ .decode = decode_frame,
+ .capabilities = AV_CODEC_CAP_DR1,
};
projects / ffmpeg / blobdiff