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123 lines
3.7 KiB
123 lines
3.7 KiB
/* |
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* Forward Uncompressed |
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* |
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* Copyright (c) 2009 Reimar Döffinger <Reimar.Doeffinger@gmx.de> |
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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 "avcodec.h" |
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#include "bytestream.h" |
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#include "libavutil/intreadwrite.h" |
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static av_cold int decode_init(AVCodecContext *avctx) |
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{ |
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if (avctx->width & 1) { |
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av_log(avctx, AV_LOG_ERROR, "frwu needs even width\n"); |
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return -1; |
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} |
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avctx->pix_fmt = PIX_FMT_UYVY422; |
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avctx->coded_frame = avcodec_alloc_frame(); |
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if (!avctx->coded_frame) |
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return AVERROR(ENOMEM); |
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return 0; |
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} |
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static int decode_frame(AVCodecContext *avctx, void *data, int *data_size, |
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AVPacket *avpkt) |
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{ |
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int field; |
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AVFrame *pic = avctx->coded_frame; |
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const uint8_t *buf = avpkt->data; |
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const uint8_t *buf_end = buf + avpkt->size; |
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if (pic->data[0]) |
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avctx->release_buffer(avctx, pic); |
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if (avpkt->size < avctx->width * 2 * avctx->height + 4 + 2*8) { |
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av_log(avctx, AV_LOG_ERROR, "Packet is too small.\n"); |
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return -1; |
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} |
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if (bytestream_get_le32(&buf) != AV_RL32("FRW1")) { |
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av_log(avctx, AV_LOG_ERROR, "incorrect marker\n"); |
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return -1; |
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} |
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pic->reference = 0; |
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if (avctx->get_buffer(avctx, pic) < 0) |
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return -1; |
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pic->pict_type = AV_PICTURE_TYPE_I; |
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pic->key_frame = 1; |
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pic->interlaced_frame = 1; |
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pic->top_field_first = 1; |
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for (field = 0; field < 2; field++) { |
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int i; |
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int field_h = (avctx->height + !field) >> 1; |
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int field_size, min_field_size = avctx->width * 2 * field_h; |
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uint8_t *dst = pic->data[0]; |
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if (buf_end - buf < 8) |
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return -1; |
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buf += 4; // flags? 0x80 == bottom field maybe? |
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field_size = bytestream_get_le32(&buf); |
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if (field_size < min_field_size) { |
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av_log(avctx, AV_LOG_ERROR, "Field size %i is too small (required %i)\n", field_size, min_field_size); |
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return -1; |
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} |
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if (buf_end - buf < field_size) { |
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av_log(avctx, AV_LOG_ERROR, "Packet is too small, need %i, have %i\n", field_size, (int)(buf_end - buf)); |
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return -1; |
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} |
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if (field) |
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dst += pic->linesize[0]; |
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for (i = 0; i < field_h; i++) { |
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memcpy(dst, buf, avctx->width * 2); |
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buf += avctx->width * 2; |
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dst += pic->linesize[0] << 1; |
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} |
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buf += field_size - min_field_size; |
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} |
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*data_size = sizeof(AVFrame); |
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*(AVFrame*)data = *pic; |
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return avpkt->size; |
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} |
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static av_cold int decode_close(AVCodecContext *avctx) |
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{ |
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AVFrame *pic = avctx->coded_frame; |
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if (pic->data[0]) |
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avctx->release_buffer(avctx, pic); |
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av_freep(&avctx->coded_frame); |
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return 0; |
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} |
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AVCodec ff_frwu_decoder = { |
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.name = "frwu", |
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.type = AVMEDIA_TYPE_VIDEO, |
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.id = CODEC_ID_FRWU, |
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.init = decode_init, |
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.close = decode_close, |
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.decode = decode_frame, |
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.capabilities = CODEC_CAP_DR1, |
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.long_name = NULL_IF_CONFIG_SMALL("Forward Uncompressed"), |
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};
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