| /* |
| * 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" |
| |
| 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; |
| const uint8_t *srca; |
| uint8_t *y, *u, *v, *a; |
| int transparent, interlaced = 1, skip, opaque_length, i, j, k; |
| |
| if (pic->data[0]) |
| avctx->release_buffer(avctx, pic); |
| |
| if (avctx->extradata_size >= 24 && |
| !memcmp(&avctx->extradata[4], "APRGAPRG0001", 12)) |
| interlaced = avctx->extradata[19] != 1; |
| 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 = 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"), |
| }; |