256 lines
7.4 KiB
C
256 lines
7.4 KiB
C
/*
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* WinCAM Motion Video decoder
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*
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* Copyright (c) 2018 Paul B Mahol
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <stdio.h>
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#include "libavutil/imgutils.h"
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#include "avcodec.h"
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#include "bytestream.h"
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#include "codec_internal.h"
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#include "decode.h"
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#include "zlib_wrapper.h"
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#include <zlib.h>
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typedef struct WCMVContext {
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int bpp;
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FFZStream zstream;
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AVFrame *prev_frame;
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uint8_t block_data[65536*8];
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} WCMVContext;
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static int decode_frame(AVCodecContext *avctx, AVFrame *frame,
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int *got_frame, AVPacket *avpkt)
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{
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WCMVContext *s = avctx->priv_data;
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z_stream *const zstream = &s->zstream.zstream;
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int skip, blocks, zret, ret, intra = 0, flags = 0, bpp = s->bpp;
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GetByteContext gb;
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uint8_t *dst;
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ret = inflateReset(zstream);
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if (ret != Z_OK) {
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av_log(avctx, AV_LOG_ERROR, "Inflate reset error: %d\n", ret);
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return AVERROR_EXTERNAL;
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}
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bytestream2_init(&gb, avpkt->data, avpkt->size);
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blocks = bytestream2_get_le16(&gb);
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if (!blocks)
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flags |= FF_REGET_BUFFER_FLAG_READONLY;
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if ((ret = ff_reget_buffer(avctx, s->prev_frame, flags)) < 0)
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return ret;
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if (blocks > 5) {
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GetByteContext bgb;
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int x = 0, size;
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if (blocks * 8 >= 0xFFFF)
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size = bytestream2_get_le24(&gb);
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else if (blocks * 8 >= 0xFF)
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size = bytestream2_get_le16(&gb);
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else
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size = bytestream2_get_byte(&gb);
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skip = bytestream2_tell(&gb);
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if (size > avpkt->size - skip)
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return AVERROR_INVALIDDATA;
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zstream->next_in = avpkt->data + skip;
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zstream->avail_in = size;
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zstream->next_out = s->block_data;
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zstream->avail_out = sizeof(s->block_data);
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zret = inflate(zstream, Z_FINISH);
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if (zret != Z_STREAM_END) {
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av_log(avctx, AV_LOG_ERROR,
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"Inflate failed with return code: %d.\n", zret);
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return AVERROR_INVALIDDATA;
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}
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ret = inflateReset(zstream);
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if (ret != Z_OK) {
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av_log(avctx, AV_LOG_ERROR, "Inflate reset error: %d\n", ret);
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return AVERROR_EXTERNAL;
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}
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bytestream2_skip(&gb, size);
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bytestream2_init(&bgb, s->block_data, blocks * 8);
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for (int i = 0; i < blocks; i++) {
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int w, h;
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bytestream2_skip(&bgb, 4);
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w = bytestream2_get_le16(&bgb);
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h = bytestream2_get_le16(&bgb);
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if (x + bpp * (int64_t)w * h > INT_MAX)
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return AVERROR_INVALIDDATA;
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x += bpp * w * h;
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}
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if (x >= 0xFFFF)
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bytestream2_skip(&gb, 3);
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else if (x >= 0xFF)
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bytestream2_skip(&gb, 2);
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else
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bytestream2_skip(&gb, 1);
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skip = bytestream2_tell(&gb);
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zstream->next_in = avpkt->data + skip;
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zstream->avail_in = avpkt->size - skip;
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bytestream2_init(&gb, s->block_data, blocks * 8);
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} else if (blocks) {
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int x = 0;
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bytestream2_seek(&gb, 2, SEEK_SET);
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for (int i = 0; i < blocks; i++) {
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int w, h;
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bytestream2_skip(&gb, 4);
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w = bytestream2_get_le16(&gb);
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h = bytestream2_get_le16(&gb);
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if (x + bpp * (int64_t)w * h > INT_MAX)
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return AVERROR_INVALIDDATA;
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x += bpp * w * h;
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}
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if (x >= 0xFFFF)
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bytestream2_skip(&gb, 3);
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else if (x >= 0xFF)
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bytestream2_skip(&gb, 2);
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else
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bytestream2_skip(&gb, 1);
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skip = bytestream2_tell(&gb);
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zstream->next_in = avpkt->data + skip;
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zstream->avail_in = avpkt->size - skip;
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bytestream2_seek(&gb, 2, SEEK_SET);
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}
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if (bytestream2_get_bytes_left(&gb) < 8LL * blocks)
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return AVERROR_INVALIDDATA;
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if (!avctx->frame_num) {
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ptrdiff_t linesize[4] = { s->prev_frame->linesize[0], 0, 0, 0 };
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av_image_fill_black(s->prev_frame->data, linesize, avctx->pix_fmt, 0,
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avctx->width, avctx->height);
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}
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for (int block = 0; block < blocks; block++) {
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int x, y, w, h;
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x = bytestream2_get_le16(&gb);
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y = bytestream2_get_le16(&gb);
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w = bytestream2_get_le16(&gb);
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h = bytestream2_get_le16(&gb);
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if (blocks == 1 && x == 0 && y == 0 && w == avctx->width && h == avctx->height)
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intra = 1;
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if (x + w > avctx->width || y + h > avctx->height)
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return AVERROR_INVALIDDATA;
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if (w > avctx->width || h > avctx->height)
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return AVERROR_INVALIDDATA;
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dst = s->prev_frame->data[0] + (avctx->height - y - 1) * s->prev_frame->linesize[0] + x * bpp;
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for (int i = 0; i < h; i++) {
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zstream->next_out = dst;
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zstream->avail_out = w * bpp;
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zret = inflate(zstream, Z_SYNC_FLUSH);
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if (zret != Z_OK && zret != Z_STREAM_END) {
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av_log(avctx, AV_LOG_ERROR,
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"Inflate failed with return code: %d.\n", zret);
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return AVERROR_INVALIDDATA;
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}
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dst -= s->prev_frame->linesize[0];
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}
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}
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if (intra)
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s->prev_frame->flags |= AV_FRAME_FLAG_KEY;
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else
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s->prev_frame->flags &= ~AV_FRAME_FLAG_KEY;
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s->prev_frame->pict_type = intra ? AV_PICTURE_TYPE_I : AV_PICTURE_TYPE_P;
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if ((ret = av_frame_ref(frame, s->prev_frame)) < 0)
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return ret;
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*got_frame = 1;
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return avpkt->size;
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}
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static av_cold int decode_init(AVCodecContext *avctx)
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{
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WCMVContext *s = avctx->priv_data;
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switch (avctx->bits_per_coded_sample) {
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case 16: avctx->pix_fmt = AV_PIX_FMT_RGB565LE; break;
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case 24: avctx->pix_fmt = AV_PIX_FMT_BGR24; break;
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case 32: avctx->pix_fmt = AV_PIX_FMT_BGRA; break;
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default: av_log(avctx, AV_LOG_ERROR, "Unsupported bits_per_coded_sample: %d\n",
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avctx->bits_per_coded_sample);
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return AVERROR_PATCHWELCOME;
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}
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s->bpp = avctx->bits_per_coded_sample >> 3;
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s->prev_frame = av_frame_alloc();
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if (!s->prev_frame)
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return AVERROR(ENOMEM);
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return ff_inflate_init(&s->zstream, avctx);
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}
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static av_cold int decode_close(AVCodecContext *avctx)
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{
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WCMVContext *s = avctx->priv_data;
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av_frame_free(&s->prev_frame);
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ff_inflate_end(&s->zstream);
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return 0;
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}
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const FFCodec ff_wcmv_decoder = {
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.p.name = "wcmv",
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CODEC_LONG_NAME("WinCAM Motion Video"),
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.p.type = AVMEDIA_TYPE_VIDEO,
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.p.id = AV_CODEC_ID_WCMV,
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.priv_data_size = sizeof(WCMVContext),
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.init = decode_init,
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.close = decode_close,
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FF_CODEC_DECODE_CB(decode_frame),
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.p.capabilities = AV_CODEC_CAP_DR1,
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.caps_internal = FF_CODEC_CAP_INIT_CLEANUP,
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};
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