diff options
Diffstat (limited to 'libavcodec/avuidec.c')
| -rw-r--r-- | libavcodec/avuidec.c | 155 |
1 files changed, 155 insertions, 0 deletions
diff --git a/libavcodec/avuidec.c b/libavcodec/avuidec.c new file mode 100644 index 0000000000..ba07a58f28 --- /dev/null +++ b/libavcodec/avuidec.c @@ -0,0 +1,155 @@ +/* + * AVID Meridien 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 "libavutil/intreadwrite.h" + +static av_cold int avui_decode_init(AVCodecContext *avctx) +{ + avctx->pix_fmt = PIX_FMT_YUVA422P; + + avctx->coded_frame = avcodec_alloc_frame(); + + if (!avctx->coded_frame) { + av_log(avctx, AV_LOG_ERROR, "Could not allocate frame.\n"); + return AVERROR(ENOMEM); + } + + return 0; +} + +static int avui_decode_frame(AVCodecContext *avctx, void *data, + int *data_size, AVPacket *avpkt) +{ + AVFrame *pic = avctx->coded_frame; + const uint8_t *src = avpkt->data, *extradata = avctx->extradata; + const uint8_t *srca; + uint8_t *y, *u, *v, *a; + int transparent, interlaced = 1, skip, opaque_length, i, j, k; + uint32_t extradata_size = avctx->extradata_size; + + if (pic->data[0]) + avctx->release_buffer(avctx, pic); + + while (extradata_size >= 24) { + uint32_t atom_size = AV_RB32(extradata); + if (!memcmp(&extradata[4], "APRGAPRG0001", 12)) { + interlaced = extradata[19] != 1; + break; + } + if (atom_size && atom_size <= extradata_size) { + extradata += atom_size; + extradata_size -= atom_size; + } else { + break; + } + } + if (avctx->height == 486) { + skip = 10; + } else { + skip = 16; + } + opaque_length = 2 * avctx->width * (avctx->height + skip) + 4 * interlaced; + if (avpkt->size < opaque_length) { + av_log(avctx, AV_LOG_ERROR, "Insufficient input data.\n"); + return AVERROR(EINVAL); + } + transparent = avctx->bits_per_coded_sample == 32 && + avpkt->size >= opaque_length * 2 + 4; + srca = src + opaque_length + 5; + + pic->reference = 0; + + if (avctx->get_buffer(avctx, pic) < 0) { + av_log(avctx, AV_LOG_ERROR, "Could not allocate buffer.\n"); + return AVERROR(ENOMEM); + } + + pic->key_frame = 1; + pic->pict_type = AV_PICTURE_TYPE_I; + + if (!interlaced) { + src += avctx->width * skip; + srca += avctx->width * skip; + } + + for (i = 0; i < interlaced + 1; i++) { + src += avctx->width * skip; + srca += avctx->width * skip; + if (interlaced && avctx->height == 486) { + y = pic->data[0] + (1 - i) * pic->linesize[0]; + u = pic->data[1] + (1 - i) * pic->linesize[1]; + v = pic->data[2] + (1 - i) * pic->linesize[2]; + a = pic->data[3] + (1 - i) * pic->linesize[3]; + } else { + y = pic->data[0] + i * pic->linesize[0]; + u = pic->data[1] + i * pic->linesize[1]; + v = pic->data[2] + i * pic->linesize[2]; + a = pic->data[3] + i * pic->linesize[3]; + } + + for (j = 0; j < avctx->height >> interlaced; j++) { + for (k = 0; k < avctx->width >> 1; k++) { + u[ k ] = *src++; + y[2 * k ] = *src++; + a[2 * k ] = 0xFF - (transparent ? *srca++ : 0); + srca++; + v[ k ] = *src++; + y[2 * k + 1] = *src++; + a[2 * k + 1] = 0xFF - (transparent ? *srca++ : 0); + srca++; + } + + y += (interlaced + 1) * pic->linesize[0]; + u += (interlaced + 1) * pic->linesize[1]; + v += (interlaced + 1) * pic->linesize[2]; + a += (interlaced + 1) * pic->linesize[3]; + } + src += 4; + srca += 4; + } + *data_size = sizeof(AVFrame); + *(AVFrame *)data = *pic; + + return avpkt->size; +} + +static av_cold int avui_decode_close(AVCodecContext *avctx) +{ + if (avctx->coded_frame->data[0]) + avctx->release_buffer(avctx, avctx->coded_frame); + + av_freep(&avctx->coded_frame); + + return 0; +} + +AVCodec ff_avui_decoder = { + .name = "avui", + .type = AVMEDIA_TYPE_VIDEO, + .id = AV_CODEC_ID_AVUI, + .init = avui_decode_init, + .decode = avui_decode_frame, + .close = avui_decode_close, + .capabilities = CODEC_CAP_DR1, + .long_name = NULL_IF_CONFIG_SMALL("AVID Meridien"), +}; |