/* * 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 "codec_internal.h"#include "decode.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, AVFrame *pic,                                int *got_frame, AVPacket *avpkt){    int line, ret;    const int width = avctx->width;    uint16_t *y, *u, *v;    const uint8_t *line_end, *src = avpkt->data;    int stride = avctx->width * 8 / 3;     if (width <= 1 || avctx->height <= 0) {        av_log(avctx, AV_LOG_ERROR, "Dimensions %dx%d not supported.\n", width, avctx->height);        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;     line_end = avpkt->data + stride;    for (line = 0; line < avctx->height; line++) {        uint16_t y_temp[6] = {0x8000, 0x8000, 0x8000, 0x8000, 0x8000, 0x8000};        uint16_t u_temp[3] = {0x8000, 0x8000, 0x8000};        uint16_t v_temp[3] = {0x8000, 0x8000, 0x8000};        int x;        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]);         for (x = 0; x < width; x += 6) {            uint32_t t;             if (width - x < 6 || line_end - src < 16) {                y = y_temp;                u = u_temp;                v = v_temp;            }             if (line_end - src < 4)                break;             t = AV_RL32(src);            src += 4;            *u++ = t <<  6 & 0xFFC0;            *y++ = t >>  4 & 0xFFC0;            *v++ = t >> 14 & 0xFFC0;             if (line_end - src < 4)                break;             t = AV_RL32(src);            src += 4;            *y++ = t <<  6 & 0xFFC0;            *u++ = t >>  4 & 0xFFC0;            *y++ = t >> 14 & 0xFFC0;             if (line_end - src < 4)                break;             t = AV_RL32(src);            src += 4;            *v++ = t <<  6 & 0xFFC0;            *y++ = t >>  4 & 0xFFC0;            *u++ = t >> 14 & 0xFFC0;             if (line_end - src < 4)                break;             t = AV_RL32(src);            src += 4;            *y++ = t <<  6 & 0xFFC0;            *v++ = t >>  4 & 0xFFC0;            *y++ = t >> 14 & 0xFFC0;             if (width - x < 6)                break;        }         if (x < width) {            y = x   + (uint16_t *)(pic->data[0] + line * pic->linesize[0]);            u = x/2 + (uint16_t *)(pic->data[1] + line * pic->linesize[1]);            v = x/2 + (uint16_t *)(pic->data[2] + line * pic->linesize[2]);            memcpy(y, y_temp, sizeof(*y) * (width - x));            memcpy(u, u_temp, sizeof(*u) * ((width - x + 1) / 2));            memcpy(v, v_temp, sizeof(*v) * ((width - x + 1) / 2));        }         line_end += stride;        src = line_end - stride;    }     *got_frame = 1;     return avpkt->size;} const FFCodec ff_zero12v_decoder = {    .p.name         = "012v",    CODEC_LONG_NAME("Uncompressed 4:2:2 10-bit"),    .p.type         = AVMEDIA_TYPE_VIDEO,    .p.id           = AV_CODEC_ID_012V,    .init           = zero12v_decode_init,    FF_CODEC_DECODE_CB(zero12v_decode_frame),    .p.capabilities = AV_CODEC_CAP_DR1,};