diff options
Diffstat (limited to 'libavcodec/012v.c')
| -rw-r--r-- | libavcodec/012v.c | 159 |
1 files changed, 159 insertions, 0 deletions
diff --git a/libavcodec/012v.c b/libavcodec/012v.c new file mode 100644 index 0000000000..c2b6a35041 --- /dev/null +++ b/libavcodec/012v.c @@ -0,0 +1,159 @@ +/* + * 012v decoder + * + * Copyright (C) 2012 Carl Eugen Hoyos + * + * 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 "avcodec.h" +#include "internal.h" +#include "libavutil/intreadwrite.h" + +static av_cold int zero12v_decode_init(AVCodecContext *avctx) +{ + avctx->pix_fmt = AV_PIX_FMT_YUV422P16; + avctx->bits_per_raw_sample = 10; + + if (avctx->codec_tag == MKTAG('a', '1', '2', 'v')) + avpriv_request_sample(avctx, "transparency"); + + return 0; +} + +static int zero12v_decode_frame(AVCodecContext *avctx, void *data, + int *got_frame, AVPacket *avpkt) +{ + int line = 0, ret; + const int width = avctx->width; + AVFrame *pic = data; + uint16_t *y, *u, *v; + const uint8_t *line_end, *src = avpkt->data; + int stride = avctx->width * 8 / 3; + + if (width == 1) { + av_log(avctx, AV_LOG_ERROR, "Width 1 not supported.\n"); + return AVERROR_INVALIDDATA; + } + + if ( avctx->codec_tag == MKTAG('0', '1', '2', 'v') + && avpkt->size % avctx->height == 0 + && avpkt->size / avctx->height * 3 >= width * 8) + stride = avpkt->size / avctx->height; + + if (avpkt->size < avctx->height * stride) { + av_log(avctx, AV_LOG_ERROR, "Packet too small: %d instead of %d\n", + avpkt->size, avctx->height * stride); + return AVERROR_INVALIDDATA; + } + + if ((ret = ff_get_buffer(avctx, pic, 0)) < 0) + return ret; + + pic->pict_type = AV_PICTURE_TYPE_I; + pic->key_frame = 1; + + y = (uint16_t *)pic->data[0]; + u = (uint16_t *)pic->data[1]; + v = (uint16_t *)pic->data[2]; + line_end = avpkt->data + stride; + + while (line++ < avctx->height) { + while (1) { + uint32_t t = AV_RL32(src); + src += 4; + *u++ = t << 6 & 0xFFC0; + *y++ = t >> 4 & 0xFFC0; + *v++ = t >> 14 & 0xFFC0; + + if (src >= line_end - 1) { + *y = 0x80; + src++; + line_end += stride; + y = (uint16_t *)(pic->data[0] + line * pic->linesize[0]); + u = (uint16_t *)(pic->data[1] + line * pic->linesize[1]); + v = (uint16_t *)(pic->data[2] + line * pic->linesize[2]); + break; + } + + t = AV_RL32(src); + src += 4; + *y++ = t << 6 & 0xFFC0; + *u++ = t >> 4 & 0xFFC0; + *y++ = t >> 14 & 0xFFC0; + if (src >= line_end - 2) { + if (!(width & 1)) { + *y = 0x80; + src += 2; + } + line_end += stride; + y = (uint16_t *)(pic->data[0] + line * pic->linesize[0]); + u = (uint16_t *)(pic->data[1] + line * pic->linesize[1]); + v = (uint16_t *)(pic->data[2] + line * pic->linesize[2]); + break; + } + + t = AV_RL32(src); + src += 4; + *v++ = t << 6 & 0xFFC0; + *y++ = t >> 4 & 0xFFC0; + *u++ = t >> 14 & 0xFFC0; + + if (src >= line_end - 1) { + *y = 0x80; + src++; + line_end += stride; + y = (uint16_t *)(pic->data[0] + line * pic->linesize[0]); + u = (uint16_t *)(pic->data[1] + line * pic->linesize[1]); + v = (uint16_t *)(pic->data[2] + line * pic->linesize[2]); + break; + } + + t = AV_RL32(src); + src += 4; + *y++ = t << 6 & 0xFFC0; + *v++ = t >> 4 & 0xFFC0; + *y++ = t >> 14 & 0xFFC0; + + if (src >= line_end - 2) { + if (width & 1) { + *y = 0x80; + src += 2; + } + line_end += stride; + y = (uint16_t *)(pic->data[0] + line * pic->linesize[0]); + u = (uint16_t *)(pic->data[1] + line * pic->linesize[1]); + v = (uint16_t *)(pic->data[2] + line * pic->linesize[2]); + break; + } + } + } + + *got_frame = 1; + + return avpkt->size; +} + +AVCodec ff_zero12v_decoder = { + .name = "012v", + .long_name = NULL_IF_CONFIG_SMALL("Uncompressed 4:2:2 10-bit"), + .type = AVMEDIA_TYPE_VIDEO, + .id = AV_CODEC_ID_012V, + .init = zero12v_decode_init, + .decode = zero12v_decode_frame, + .capabilities = CODEC_CAP_DR1, +}; |