mirror of
https://github.com/FFmpeg/FFmpeg.git
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266 lines
9.0 KiB
C
266 lines
9.0 KiB
C
/*
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* Raw Video Decoder
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* Copyright (c) 2001 Fabrice Bellard
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*
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* This file is part of Libav.
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*
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* Libav 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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* Libav 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 Libav; 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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/**
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* @file
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* Raw Video Decoder
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*/
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#include "avcodec.h"
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#include "internal.h"
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#include "raw.h"
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#include "libavutil/buffer.h"
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#include "libavutil/common.h"
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#include "libavutil/intreadwrite.h"
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#include "libavutil/imgutils.h"
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typedef struct RawVideoContext {
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AVBufferRef *palette;
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int frame_size; /* size of the frame in bytes */
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int flip;
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int is_2_4_bpp; // 2 or 4 bpp raw in avi/mov
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int is_yuv2;
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} RawVideoContext;
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static const PixelFormatTag pix_fmt_bps_avi[] = {
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{ AV_PIX_FMT_PAL8, 4 },
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{ AV_PIX_FMT_PAL8, 8 },
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{ AV_PIX_FMT_RGB444, 12 },
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{ AV_PIX_FMT_RGB555, 15 },
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{ AV_PIX_FMT_RGB555, 16 },
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{ AV_PIX_FMT_BGR24, 24 },
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{ AV_PIX_FMT_RGB32, 32 },
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{ AV_PIX_FMT_NONE, 0 },
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};
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static const PixelFormatTag pix_fmt_bps_mov[] = {
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{ AV_PIX_FMT_MONOWHITE, 1 },
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{ AV_PIX_FMT_PAL8, 2 },
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{ AV_PIX_FMT_PAL8, 4 },
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{ AV_PIX_FMT_PAL8, 8 },
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// FIXME swscale does not support 16 bit in .mov, sample 16bit.mov
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// http://developer.apple.com/documentation/QuickTime/QTFF/QTFFChap3/qtff3.html
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{ AV_PIX_FMT_RGB555BE, 16 },
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{ AV_PIX_FMT_RGB24, 24 },
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{ AV_PIX_FMT_ARGB, 32 },
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{ AV_PIX_FMT_MONOWHITE,33 },
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{ AV_PIX_FMT_NONE, 0 },
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};
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static enum AVPixelFormat find_pix_fmt(const PixelFormatTag *tags,
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unsigned int fourcc)
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{
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while (tags->pix_fmt >= 0) {
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if (tags->fourcc == fourcc)
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return tags->pix_fmt;
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tags++;
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}
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return AV_PIX_FMT_YUV420P;
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}
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static av_cold int raw_init_decoder(AVCodecContext *avctx)
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{
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RawVideoContext *context = avctx->priv_data;
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const AVPixFmtDescriptor *desc;
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if (avctx->codec_tag == MKTAG('r', 'a', 'w', ' '))
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avctx->pix_fmt = find_pix_fmt(pix_fmt_bps_mov,
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avctx->bits_per_coded_sample);
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else if (avctx->codec_tag == MKTAG('W', 'R', 'A', 'W'))
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avctx->pix_fmt = find_pix_fmt(pix_fmt_bps_avi,
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avctx->bits_per_coded_sample);
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else if (avctx->codec_tag)
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avctx->pix_fmt = find_pix_fmt(ff_raw_pix_fmt_tags, avctx->codec_tag);
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else if (avctx->pix_fmt == AV_PIX_FMT_NONE && avctx->bits_per_coded_sample)
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avctx->pix_fmt = find_pix_fmt(pix_fmt_bps_avi,
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avctx->bits_per_coded_sample);
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desc = av_pix_fmt_desc_get(avctx->pix_fmt);
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if (!desc) {
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av_log(avctx, AV_LOG_ERROR, "Invalid pixel format.\n");
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return AVERROR(EINVAL);
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}
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if (desc->flags & (AV_PIX_FMT_FLAG_PAL | AV_PIX_FMT_FLAG_PSEUDOPAL)) {
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context->palette = av_buffer_alloc(AVPALETTE_SIZE);
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if (!context->palette)
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return AVERROR(ENOMEM);
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if (desc->flags & AV_PIX_FMT_FLAG_PSEUDOPAL)
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avpriv_set_systematic_pal2((uint32_t*)context->palette->data, avctx->pix_fmt);
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else
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memset(context->palette->data, 0, AVPALETTE_SIZE);
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}
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context->frame_size = avpicture_get_size(avctx->pix_fmt, avctx->width,
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avctx->height);
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if ((avctx->bits_per_coded_sample == 4 || avctx->bits_per_coded_sample == 2) &&
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avctx->pix_fmt == AV_PIX_FMT_PAL8 &&
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(!avctx->codec_tag || avctx->codec_tag == MKTAG('r','a','w',' ')))
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context->is_2_4_bpp = 1;
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if ((avctx->extradata_size >= 9 &&
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!memcmp(avctx->extradata + avctx->extradata_size - 9, "BottomUp", 9)) ||
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avctx->codec_tag == MKTAG(3, 0, 0, 0) ||
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avctx->codec_tag == MKTAG('W','R','A','W'))
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context->flip = 1;
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if (avctx->codec_tag == AV_RL32("yuv2") &&
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avctx->pix_fmt == AV_PIX_FMT_YUYV422)
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context->is_yuv2 = 1;
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return 0;
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}
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static void flip(AVCodecContext *avctx, AVPicture *picture)
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{
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picture->data[0] += picture->linesize[0] * (avctx->height - 1);
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picture->linesize[0] *= -1;
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}
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static int raw_decode(AVCodecContext *avctx, void *data, int *got_frame,
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AVPacket *avpkt)
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{
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const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(avctx->pix_fmt);
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RawVideoContext *context = avctx->priv_data;
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const uint8_t *buf = avpkt->data;
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int buf_size = avpkt->size;
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int need_copy = !avpkt->buf || context->is_2_4_bpp || context->is_yuv2;
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int res;
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AVFrame *frame = data;
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AVPicture *picture = data;
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frame->pict_type = AV_PICTURE_TYPE_I;
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frame->key_frame = 1;
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frame->reordered_opaque = avctx->reordered_opaque;
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frame->pkt_pts = avctx->internal->pkt->pts;
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if (buf_size < context->frame_size - (avctx->pix_fmt == AV_PIX_FMT_PAL8 ?
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AVPALETTE_SIZE : 0))
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return -1;
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if (need_copy)
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frame->buf[0] = av_buffer_alloc(context->frame_size);
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else
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frame->buf[0] = av_buffer_ref(avpkt->buf);
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if (!frame->buf[0])
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return AVERROR(ENOMEM);
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//2bpp and 4bpp raw in avi and mov (yes this is ugly ...)
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if (context->is_2_4_bpp) {
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int i;
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uint8_t *dst = frame->buf[0]->data;
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buf_size = context->frame_size - AVPALETTE_SIZE;
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if (avctx->bits_per_coded_sample == 4) {
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for (i = 0; 2 * i + 1 < buf_size; i++) {
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dst[2 * i + 0] = buf[i] >> 4;
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dst[2 * i + 1] = buf[i] & 15;
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}
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} else {
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for (i = 0; 4 * i + 3 < buf_size; i++) {
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dst[4 * i + 0] = buf[i] >> 6;
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dst[4 * i + 1] = buf[i] >> 4 & 3;
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dst[4 * i + 2] = buf[i] >> 2 & 3;
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dst[4 * i + 3] = buf[i] & 3;
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}
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}
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buf = dst;
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} else if (need_copy) {
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memcpy(frame->buf[0]->data, buf, FFMIN(buf_size, context->frame_size));
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buf = frame->buf[0]->data;
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}
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if (avctx->codec_tag == MKTAG('A', 'V', '1', 'x') ||
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avctx->codec_tag == MKTAG('A', 'V', 'u', 'p'))
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buf += buf_size - context->frame_size;
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if ((res = avpicture_fill(picture, buf, avctx->pix_fmt,
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avctx->width, avctx->height)) < 0)
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return res;
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if (avctx->pix_fmt == AV_PIX_FMT_PAL8) {
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const uint8_t *pal = av_packet_get_side_data(avpkt, AV_PKT_DATA_PALETTE,
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NULL);
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if (pal) {
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av_buffer_unref(&context->palette);
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context->palette = av_buffer_alloc(AVPALETTE_SIZE);
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if (!context->palette)
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return AVERROR(ENOMEM);
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memcpy(context->palette->data, pal, AVPALETTE_SIZE);
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frame->palette_has_changed = 1;
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}
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}
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if ((avctx->pix_fmt == AV_PIX_FMT_PAL8 && buf_size < context->frame_size) ||
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(desc->flags & AV_PIX_FMT_FLAG_PSEUDOPAL)) {
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frame->buf[1] = av_buffer_ref(context->palette);
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if (!frame->buf[1])
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return AVERROR(ENOMEM);
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frame->data[1] = frame->buf[1]->data;
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}
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if (avctx->pix_fmt == AV_PIX_FMT_BGR24 &&
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((frame->linesize[0] + 3) & ~3) * avctx->height <= buf_size)
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frame->linesize[0] = (frame->linesize[0] + 3) & ~3;
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if (context->flip)
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flip(avctx, picture);
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if (avctx->codec_tag == MKTAG('Y', 'V', '1', '2') ||
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avctx->codec_tag == MKTAG('Y', 'V', '1', '6') ||
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avctx->codec_tag == MKTAG('Y', 'V', '2', '4') ||
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avctx->codec_tag == MKTAG('Y', 'V', 'U', '9'))
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FFSWAP(uint8_t *, picture->data[1], picture->data[2]);
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if (avctx->codec_tag == AV_RL32("yuv2") &&
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avctx->pix_fmt == AV_PIX_FMT_YUYV422) {
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int x, y;
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uint8_t *line = picture->data[0];
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for (y = 0; y < avctx->height; y++) {
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for (x = 0; x < avctx->width; x++)
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line[2 * x + 1] ^= 0x80;
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line += picture->linesize[0];
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}
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}
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*got_frame = 1;
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return buf_size;
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}
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static av_cold int raw_close_decoder(AVCodecContext *avctx)
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{
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RawVideoContext *context = avctx->priv_data;
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av_buffer_unref(&context->palette);
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return 0;
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}
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AVCodec ff_rawvideo_decoder = {
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.name = "rawvideo",
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.long_name = NULL_IF_CONFIG_SMALL("raw video"),
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.type = AVMEDIA_TYPE_VIDEO,
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.id = AV_CODEC_ID_RAWVIDEO,
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.priv_data_size = sizeof(RawVideoContext),
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.init = raw_init_decoder,
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.close = raw_close_decoder,
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.decode = raw_decode,
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};
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