| /* |
| * WinCAM Motion Video decoder |
| * |
| * Copyright (c) 2018 Paul B Mahol |
| * |
| * This file is part of FFmpeg. |
| * |
| * FFmpeg 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, |
| * 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 |
| * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| */ |
| |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <string.h> |
| |
| #include "libavutil/imgutils.h" |
| |
| #include "avcodec.h" |
| #include "bytestream.h" |
| #include "internal.h" |
| |
| #include <zlib.h> |
| |
| typedef struct WCMVContext { |
| int bpp; |
| z_stream zstream; |
| AVFrame *prev_frame; |
| uint8_t block_data[65536*8]; |
| } WCMVContext; |
| |
| static int decode_frame(AVCodecContext *avctx, |
| void *data, int *got_frame, |
| AVPacket *avpkt) |
| { |
| WCMVContext *s = avctx->priv_data; |
| AVFrame *frame = data; |
| int skip, blocks, zret, ret, intra = 0, flags = 0, bpp = s->bpp; |
| GetByteContext gb; |
| uint8_t *dst; |
| |
| ret = inflateReset(&s->zstream); |
| if (ret != Z_OK) { |
| av_log(avctx, AV_LOG_ERROR, "Inflate reset error: %d\n", ret); |
| return AVERROR_EXTERNAL; |
| } |
| |
| bytestream2_init(&gb, avpkt->data, avpkt->size); |
| blocks = bytestream2_get_le16(&gb); |
| if (!blocks) |
| flags |= FF_REGET_BUFFER_FLAG_READONLY; |
| |
| if ((ret = ff_reget_buffer(avctx, s->prev_frame, flags)) < 0) |
| return ret; |
| |
| if (blocks > 5) { |
| GetByteContext bgb; |
| int x = 0, size; |
| |
| if (blocks * 8 >= 0xFFFF) |
| size = bytestream2_get_le24(&gb); |
| else if (blocks * 8 >= 0xFF) |
| size = bytestream2_get_le16(&gb); |
| else |
| size = bytestream2_get_byte(&gb); |
| |
| skip = bytestream2_tell(&gb); |
| if (size > avpkt->size - skip) |
| return AVERROR_INVALIDDATA; |
| |
| s->zstream.next_in = avpkt->data + skip; |
| s->zstream.avail_in = size; |
| s->zstream.next_out = s->block_data; |
| s->zstream.avail_out = sizeof(s->block_data); |
| |
| zret = inflate(&s->zstream, Z_FINISH); |
| if (zret != Z_STREAM_END) { |
| av_log(avctx, AV_LOG_ERROR, |
| "Inflate failed with return code: %d.\n", zret); |
| return AVERROR_INVALIDDATA; |
| } |
| |
| ret = inflateReset(&s->zstream); |
| if (ret != Z_OK) { |
| av_log(avctx, AV_LOG_ERROR, "Inflate reset error: %d\n", ret); |
| return AVERROR_EXTERNAL; |
| } |
| |
| bytestream2_skip(&gb, size); |
| bytestream2_init(&bgb, s->block_data, blocks * 8); |
| |
| for (int i = 0; i < blocks; i++) { |
| int w, h; |
| |
| bytestream2_skip(&bgb, 4); |
| w = bytestream2_get_le16(&bgb); |
| h = bytestream2_get_le16(&bgb); |
| if (x + bpp * (int64_t)w * h > INT_MAX) |
| return AVERROR_INVALIDDATA; |
| x += bpp * w * h; |
| } |
| |
| if (x >= 0xFFFF) |
| bytestream2_skip(&gb, 3); |
| else if (x >= 0xFF) |
| bytestream2_skip(&gb, 2); |
| else |
| bytestream2_skip(&gb, 1); |
| |
| skip = bytestream2_tell(&gb); |
| |
| s->zstream.next_in = avpkt->data + skip; |
| s->zstream.avail_in = avpkt->size - skip; |
| |
| bytestream2_init(&gb, s->block_data, blocks * 8); |
| } else if (blocks) { |
| int x = 0; |
| |
| bytestream2_seek(&gb, 2, SEEK_SET); |
| |
| for (int i = 0; i < blocks; i++) { |
| int w, h; |
| |
| bytestream2_skip(&gb, 4); |
| w = bytestream2_get_le16(&gb); |
| h = bytestream2_get_le16(&gb); |
| if (x + bpp * (int64_t)w * h > INT_MAX) |
| return AVERROR_INVALIDDATA; |
| x += bpp * w * h; |
| } |
| |
| if (x >= 0xFFFF) |
| bytestream2_skip(&gb, 3); |
| else if (x >= 0xFF) |
| bytestream2_skip(&gb, 2); |
| else |
| bytestream2_skip(&gb, 1); |
| |
| skip = bytestream2_tell(&gb); |
| |
| s->zstream.next_in = avpkt->data + skip; |
| s->zstream.avail_in = avpkt->size - skip; |
| |
| bytestream2_seek(&gb, 2, SEEK_SET); |
| } |
| |
| if (bytestream2_get_bytes_left(&gb) < 8LL * blocks) |
| return AVERROR_INVALIDDATA; |
| |
| if (!avctx->frame_number) { |
| ptrdiff_t linesize[4] = { s->prev_frame->linesize[0], 0, 0, 0 }; |
| av_image_fill_black(s->prev_frame->data, linesize, avctx->pix_fmt, 0, |
| avctx->width, avctx->height); |
| } |
| |
| for (int block = 0; block < blocks; block++) { |
| int x, y, w, h; |
| |
| x = bytestream2_get_le16(&gb); |
| y = bytestream2_get_le16(&gb); |
| w = bytestream2_get_le16(&gb); |
| h = bytestream2_get_le16(&gb); |
| |
| if (blocks == 1 && x == 0 && y == 0 && w == avctx->width && h == avctx->height) |
| intra = 1; |
| |
| if (x + w > avctx->width || y + h > avctx->height) |
| return AVERROR_INVALIDDATA; |
| |
| if (w > avctx->width || h > avctx->height) |
| return AVERROR_INVALIDDATA; |
| |
| dst = s->prev_frame->data[0] + (avctx->height - y - 1) * s->prev_frame->linesize[0] + x * bpp; |
| for (int i = 0; i < h; i++) { |
| s->zstream.next_out = dst; |
| s->zstream.avail_out = w * bpp; |
| |
| zret = inflate(&s->zstream, Z_SYNC_FLUSH); |
| if (zret != Z_OK && zret != Z_STREAM_END) { |
| av_log(avctx, AV_LOG_ERROR, |
| "Inflate failed with return code: %d.\n", zret); |
| return AVERROR_INVALIDDATA; |
| } |
| |
| dst -= s->prev_frame->linesize[0]; |
| } |
| } |
| |
| s->prev_frame->key_frame = intra; |
| s->prev_frame->pict_type = intra ? AV_PICTURE_TYPE_I : AV_PICTURE_TYPE_P; |
| |
| if ((ret = av_frame_ref(frame, s->prev_frame)) < 0) |
| return ret; |
| |
| *got_frame = 1; |
| |
| return avpkt->size; |
| } |
| |
| static av_cold int decode_init(AVCodecContext *avctx) |
| { |
| WCMVContext *s = avctx->priv_data; |
| int zret; |
| |
| switch (avctx->bits_per_coded_sample) { |
| case 16: avctx->pix_fmt = AV_PIX_FMT_RGB565LE; break; |
| case 24: avctx->pix_fmt = AV_PIX_FMT_BGR24; break; |
| case 32: avctx->pix_fmt = AV_PIX_FMT_BGRA; break; |
| default: av_log(avctx, AV_LOG_ERROR, "Unsupported bits_per_coded_sample: %d\n", |
| avctx->bits_per_coded_sample); |
| return AVERROR_PATCHWELCOME; |
| } |
| |
| s->bpp = avctx->bits_per_coded_sample >> 3; |
| |
| s->zstream.zalloc = Z_NULL; |
| s->zstream.zfree = Z_NULL; |
| s->zstream.opaque = Z_NULL; |
| zret = inflateInit(&s->zstream); |
| if (zret != Z_OK) { |
| av_log(avctx, AV_LOG_ERROR, "Inflate init error: %d\n", zret); |
| return AVERROR_EXTERNAL; |
| } |
| |
| s->prev_frame = av_frame_alloc(); |
| if (!s->prev_frame) |
| return AVERROR(ENOMEM); |
| |
| return 0; |
| } |
| |
| static av_cold int decode_close(AVCodecContext *avctx) |
| { |
| WCMVContext *s = avctx->priv_data; |
| |
| av_frame_free(&s->prev_frame); |
| inflateEnd(&s->zstream); |
| |
| return 0; |
| } |
| |
| AVCodec ff_wcmv_decoder = { |
| .name = "wcmv", |
| .long_name = NULL_IF_CONFIG_SMALL("WinCAM Motion Video"), |
| .type = AVMEDIA_TYPE_VIDEO, |
| .id = AV_CODEC_ID_WCMV, |
| .priv_data_size = sizeof(WCMVContext), |
| .init = decode_init, |
| .close = decode_close, |
| .decode = decode_frame, |
| .capabilities = AV_CODEC_CAP_DR1, |
| .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE | |
| FF_CODEC_CAP_INIT_CLEANUP, |
| }; |