X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=libavcodec%2Favs.c;h=85d18fd41af69d73c8dc55045ae865316e80a6e0;hb=3a651f599a18b023602370b67a77eb0efa309b20;hp=7d4f3e45e603cc8006e839d3f07f32bddb0455b6;hpb=ebc0790441fa50a5e21190f3d6e66d9a51f7ee60;p=ffmpeg diff --git a/libavcodec/avs.c b/libavcodec/avs.c index 7d4f3e45e60..85d18fd41af 100644 --- a/libavcodec/avs.c +++ b/libavcodec/avs.c @@ -2,81 +2,87 @@ * AVS video decoder. * Copyright (c) 2006 Aurelien Jacobs * - * 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 */ #include "avcodec.h" -#include "bitstream.h" +#include "get_bits.h" +#include "internal.h" - -typedef struct { - AVFrame picture; -} avs_context_t; +typedef struct AvsContext { + AVFrame *frame; +} AvsContext; typedef enum { AVS_VIDEO = 0x01, AVS_AUDIO = 0x02, AVS_PALETTE = 0x03, AVS_GAME_DATA = 0x04, -} avs_block_type_t; +} AvsBlockType; typedef enum { AVS_I_FRAME = 0x00, AVS_P_FRAME_3X3 = 0x01, AVS_P_FRAME_2X2 = 0x02, AVS_P_FRAME_2X3 = 0x03, -} avs_video_sub_type_t; +} AvsVideoSubType; static int avs_decode_frame(AVCodecContext * avctx, - void *data, int *data_size, const uint8_t * buf, int buf_size) + void *data, int *got_frame, AVPacket *avpkt) { - avs_context_t *const avs = avctx->priv_data; + const uint8_t *buf = avpkt->data; + const uint8_t *buf_end = avpkt->data + avpkt->size; + int buf_size = avpkt->size; + AvsContext *const avs = avctx->priv_data; AVFrame *picture = data; - AVFrame *const p = (AVFrame *) & avs->picture; + AVFrame *const p = avs->frame; const uint8_t *table, *vect; uint8_t *out; - int i, j, x, y, stride, vect_w = 3, vect_h = 3; - int sub_type; - avs_block_type_t type; + int i, j, x, y, stride, ret, vect_w = 3, vect_h = 3; + AvsVideoSubType sub_type; + AvsBlockType type; GetBitContext change_map; - if (avctx->reget_buffer(avctx, p)) { + if ((ret = ff_reget_buffer(avctx, p)) < 0) { av_log(avctx, AV_LOG_ERROR, "reget_buffer() failed\n"); - return -1; + return ret; } - p->reference = 1; - p->pict_type = FF_P_TYPE; + p->pict_type = AV_PICTURE_TYPE_P; p->key_frame = 0; - out = avs->picture.data[0]; - stride = avs->picture.linesize[0]; + out = p->data[0]; + stride = p->linesize[0]; + if (buf_end - buf < 4) + return AVERROR_INVALIDDATA; sub_type = buf[0]; type = buf[1]; buf += 4; if (type == AVS_PALETTE) { int first, last; - uint32_t *pal = (uint32_t *) avs->picture.data[1]; + uint32_t *pal = (uint32_t *) p->data[1]; first = AV_RL16(buf); last = first + AV_RL16(buf + 2); + if (first >= 256 || last > 256 || buf_end - buf < 4 + 4 + 3 * (last - first)) + return AVERROR_INVALIDDATA; buf += 4; for (i=first; ipict_type = FF_I_TYPE; + p->pict_type = AV_PICTURE_TYPE_I; p->key_frame = 1; case AVS_P_FRAME_3X3: vect_w = 3; @@ -109,19 +115,25 @@ avs_decode_frame(AVCodecContext * avctx, break; default: - return -1; + return AVERROR_INVALIDDATA; } + if (buf_end - buf < 256 * vect_w * vect_h) + return AVERROR_INVALIDDATA; table = buf + (256 * vect_w * vect_h); if (sub_type != AVS_I_FRAME) { int map_size = ((318 / vect_w + 7) / 8) * (198 / vect_h); - init_get_bits(&change_map, table, map_size); + if (buf_end - table < map_size) + return AVERROR_INVALIDDATA; + init_get_bits(&change_map, table, map_size * 8); table += map_size; } for (y=0; y<198; y+=vect_h) { for (x=0; x<318; x+=vect_w) { if (sub_type == AVS_I_FRAME || get_bits1(&change_map)) { + if (buf_end - table < 1) + return AVERROR_INVALIDDATA; vect = &buf[*table++ * (vect_w * vect_h)]; for (j=0; jpicture; - *data_size = sizeof(AVPicture); + if ((ret = av_frame_ref(picture, p)) < 0) + return ret; + *got_frame = 1; return buf_size; } -static int avs_decode_init(AVCodecContext * avctx) +static av_cold int avs_decode_init(AVCodecContext * avctx) +{ + AvsContext *s = avctx->priv_data; + + s->frame = av_frame_alloc(); + if (!s->frame) + return AVERROR(ENOMEM); + + avctx->pix_fmt = AV_PIX_FMT_PAL8; + + return ff_set_dimensions(avctx, 318, 198); +} + +static av_cold int avs_decode_end(AVCodecContext *avctx) { - avctx->pix_fmt = PIX_FMT_PAL8; + AvsContext *s = avctx->priv_data; + av_frame_free(&s->frame); return 0; } -AVCodec avs_decoder = { - "avs", - CODEC_TYPE_VIDEO, - CODEC_ID_AVS, - sizeof(avs_context_t), - avs_decode_init, - NULL, - NULL, - avs_decode_frame, - CODEC_CAP_DR1, + +AVCodec ff_avs_decoder = { + .name = "avs", + .long_name = NULL_IF_CONFIG_SMALL("AVS (Audio Video Standard) video"), + .type = AVMEDIA_TYPE_VIDEO, + .id = AV_CODEC_ID_AVS, + .priv_data_size = sizeof(AvsContext), + .init = avs_decode_init, + .decode = avs_decode_frame, + .close = avs_decode_end, + .capabilities = CODEC_CAP_DR1, };