diff options
author | Paul B Mahol <onemda@gmail.com> | 2018-08-25 19:51:37 +0300 |
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committer | Paul B Mahol <onemda@gmail.com> | 2018-08-27 23:06:19 +0300 |
commit | ad2ac1e7dd9053bf07225f7e9be29c7d2cbdeaf1 (patch) | |
tree | 2bd56f9a2d25f2a0f1bb50992f510508c2a033a1 /libavcodec/wcmv.c | |
parent | f7d749e95b932549ae1f30e5e6e821643d247bf1 (diff) |
avcodec: add WinCAM Motion Video decoder
Diffstat (limited to 'libavcodec/wcmv.c')
-rw-r--r-- | libavcodec/wcmv.c | 260 |
1 files changed, 260 insertions, 0 deletions
diff --git a/libavcodec/wcmv.c b/libavcodec/wcmv.c new file mode 100644 index 0000000000..233427f3fa --- /dev/null +++ b/libavcodec/wcmv.c @@ -0,0 +1,260 @@ +/* + * 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, 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); + + if ((ret = ff_get_buffer(avctx, frame, AV_GET_BUFFER_FLAG_REF)) < 0) + return ret; + + if (s->prev_frame->data[0]) { + ret = av_frame_copy(frame, s->prev_frame); + if (ret < 0) + return ret; + } else { + ptrdiff_t linesize[4] = { frame->linesize[0], 0, 0, 0 }; + av_image_fill_black(frame->data, linesize, avctx->pix_fmt, 0, + avctx->width, avctx->height); + } + + blocks = bytestream2_get_le16(&gb); + 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); + 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); + 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); + } + + 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 = frame->data[0] + (avctx->height - y - 1) * 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 -= frame->linesize[0]; + } + } + + frame->key_frame = intra; + frame->pict_type = intra ? AV_PICTURE_TYPE_I : AV_PICTURE_TYPE_P; + + av_frame_unref(s->prev_frame); + if ((ret = av_frame_ref(s->prev_frame, 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_RGB565; 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, +}; |