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ffmpeg/libavcodec/rawdec.c

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/*
* Raw Video Decoder
* Copyright (c) 2001 Fabrice Bellard
*
* 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
*/
/**
* @file
* Raw Video Decoder
*/
#include "avcodec.h"
#include "imgconvert.h"
#include "raw.h"
#include "libavutil/intreadwrite.h"
#include "libavutil/imgutils.h"
#include "libavutil/opt.h"
typedef struct RawVideoContext {
AVClass *av_class;
uint32_t palette[AVPALETTE_COUNT];
unsigned char * buffer; /* block of memory for holding one frame */
int length; /* number of bytes in buffer */
int flip;
AVFrame pic; ///< AVCodecContext.coded_frame
int tff;
} RawVideoContext;
static const AVOption options[]={
{"top", "top field first", offsetof(RawVideoContext, tff), AV_OPT_TYPE_INT, {.dbl = -1}, -1, 1, AV_OPT_FLAG_DECODING_PARAM|AV_OPT_FLAG_VIDEO_PARAM},
{NULL}
};
static const AVClass class = { "rawdec", NULL, options, LIBAVUTIL_VERSION_INT };
static const PixelFormatTag pix_fmt_bps_avi[] = {
{ PIX_FMT_MONOWHITE, 1 },
{ PIX_FMT_PAL8, 2 },
{ PIX_FMT_PAL8, 4 },
{ PIX_FMT_PAL8, 8 },
{ PIX_FMT_RGB444, 12 },
{ PIX_FMT_RGB555, 15 },
{ PIX_FMT_RGB555, 16 },
{ PIX_FMT_BGR24, 24 },
{ PIX_FMT_BGRA, 32 },
{ PIX_FMT_NONE, 0 },
};
static const PixelFormatTag pix_fmt_bps_mov[] = {
{ PIX_FMT_MONOWHITE, 1 },
{ PIX_FMT_PAL8, 2 },
{ PIX_FMT_PAL8, 4 },
{ PIX_FMT_PAL8, 8 },
// FIXME swscale does not support 16 bit in .mov, sample 16bit.mov
// http://developer.apple.com/documentation/QuickTime/QTFF/QTFFChap3/qtff3.html
{ PIX_FMT_RGB555BE, 16 },
{ PIX_FMT_RGB24, 24 },
{ PIX_FMT_ARGB, 32 },
{ PIX_FMT_MONOWHITE,33 },
{ PIX_FMT_NONE, 0 },
};
enum PixelFormat ff_find_pix_fmt(const PixelFormatTag *tags, unsigned int fourcc)
{
while (tags->pix_fmt >= 0) {
if (tags->fourcc == fourcc)
return tags->pix_fmt;
tags++;
}
return PIX_FMT_YUV420P;
}
static av_cold int raw_init_decoder(AVCodecContext *avctx)
{
RawVideoContext *context = avctx->priv_data;
if (avctx->codec_tag == MKTAG('r','a','w',' '))
avctx->pix_fmt = ff_find_pix_fmt(pix_fmt_bps_mov, avctx->bits_per_coded_sample);
else if (avctx->codec_tag == MKTAG('W','R','A','W'))
avctx->pix_fmt = ff_find_pix_fmt(pix_fmt_bps_avi, avctx->bits_per_coded_sample);
else if (avctx->codec_tag)
avctx->pix_fmt = ff_find_pix_fmt(ff_raw_pix_fmt_tags, avctx->codec_tag);
else if (avctx->pix_fmt == PIX_FMT_NONE && avctx->bits_per_coded_sample)
avctx->pix_fmt = ff_find_pix_fmt(pix_fmt_bps_avi, avctx->bits_per_coded_sample);
if (avctx->pix_fmt == PIX_FMT_NONE) {
av_log(avctx, AV_LOG_ERROR, "Pixel format was not specified and cannot be detected\n");
return AVERROR(EINVAL);
}
ff_set_systematic_pal2(context->palette, avctx->pix_fmt);
if((avctx->bits_per_coded_sample == 4 || avctx->bits_per_coded_sample == 2) &&
avctx->pix_fmt==PIX_FMT_PAL8 &&
(!avctx->codec_tag || avctx->codec_tag == MKTAG('r','a','w',' '))){
context->length = avpicture_get_size(avctx->pix_fmt, FFALIGN(avctx->width, 16), avctx->height);
context->buffer = av_malloc(context->length);
if (!context->buffer)
return -1;
} else {
context->length = avpicture_get_size(avctx->pix_fmt, avctx->width, avctx->height);
}
context->pic.pict_type = AV_PICTURE_TYPE_I;
context->pic.key_frame = 1;
avctx->coded_frame= &context->pic;
if((avctx->extradata_size >= 9 && !memcmp(avctx->extradata + avctx->extradata_size - 9, "BottomUp", 9)) ||
avctx->codec_tag == MKTAG('c','y','u','v') ||
avctx->codec_tag == MKTAG(3, 0, 0, 0) || avctx->codec_tag == MKTAG('W','R','A','W'))
context->flip=1;
return 0;
}
static void flip(AVCodecContext *avctx, AVPicture * picture){
picture->data[0] += picture->linesize[0] * (avctx->height-1);
picture->linesize[0] *= -1;
}
static int raw_decode(AVCodecContext *avctx,
void *data, int *data_size,
AVPacket *avpkt)
{
const uint8_t *buf = avpkt->data;
int buf_size = avpkt->size;
int linesize_align = 4;
RawVideoContext *context = avctx->priv_data;
AVFrame *frame = data;
AVPicture *picture = data;
frame->pict_type = avctx->coded_frame->pict_type;
frame->interlaced_frame = avctx->coded_frame->interlaced_frame;
frame->top_field_first = avctx->coded_frame->top_field_first;
frame->reordered_opaque = avctx->reordered_opaque;
frame->pkt_pts = avctx->pkt->pts;
frame->pkt_pos = avctx->pkt->pos;
if(context->tff>=0){
frame->interlaced_frame = 1;
frame->top_field_first = context->tff;
}
if(buf_size < context->length - (avctx->pix_fmt==PIX_FMT_PAL8 ? 256*4 : 0))
return -1;
//2bpp and 4bpp raw in avi and mov (yes this is ugly ...)
if (context->buffer) {
int i;
uint8_t *dst = context->buffer;
buf_size = context->length - 256*4;
if (avctx->bits_per_coded_sample == 4){
for(i=0; 2*i+1 < buf_size && i<avpkt->size; i++){
dst[2*i+0]= buf[i]>>4;
dst[2*i+1]= buf[i]&15;
}
linesize_align = 8;
} else {
for(i=0; 4*i+3 < buf_size && i<avpkt->size; i++){
dst[4*i+0]= buf[i]>>6;
dst[4*i+1]= buf[i]>>4&3;
dst[4*i+2]= buf[i]>>2&3;
dst[4*i+3]= buf[i] &3;
}
linesize_align = 16;
}
buf= dst;
}
if(avctx->codec_tag == MKTAG('A', 'V', '1', 'x') ||
avctx->codec_tag == MKTAG('A', 'V', 'u', 'p'))
buf += buf_size - context->length;
avpicture_fill(picture, buf, avctx->pix_fmt, avctx->width, avctx->height);
if((avctx->pix_fmt==PIX_FMT_PAL8 && buf_size < context->length) ||
(av_pix_fmt_descriptors[avctx->pix_fmt].flags & PIX_FMT_PSEUDOPAL)) {
frame->data[1]= context->palette;
}
if (avctx->pix_fmt == PIX_FMT_PAL8) {
const uint8_t *pal = av_packet_get_side_data(avpkt, AV_PKT_DATA_PALETTE, NULL);
if (pal) {
memcpy(frame->data[1], pal, AVPALETTE_SIZE);
frame->palette_has_changed = 1;
}
}
if((avctx->pix_fmt==PIX_FMT_BGR24 ||
avctx->pix_fmt==PIX_FMT_GRAY8 ||
avctx->pix_fmt==PIX_FMT_RGB555LE ||
avctx->pix_fmt==PIX_FMT_RGB555BE ||
avctx->pix_fmt==PIX_FMT_RGB565LE ||
avctx->pix_fmt==PIX_FMT_MONOWHITE ||
avctx->pix_fmt==PIX_FMT_PAL8) &&
FFALIGN(frame->linesize[0], linesize_align)*avctx->height <= buf_size)
frame->linesize[0] = FFALIGN(frame->linesize[0], linesize_align);
if(context->flip)
flip(avctx, picture);
if ( avctx->codec_tag == MKTAG('Y', 'V', '1', '2')
|| avctx->codec_tag == MKTAG('Y', 'V', '1', '6')
|| avctx->codec_tag == MKTAG('Y', 'V', '2', '4')
|| avctx->codec_tag == MKTAG('Y', 'V', 'U', '9'))
FFSWAP(uint8_t *, picture->data[1], picture->data[2]);
if(avctx->codec_tag == AV_RL32("yuv2") &&
avctx->pix_fmt == PIX_FMT_YUYV422) {
int x, y;
uint8_t *line = picture->data[0];
for(y = 0; y < avctx->height; y++) {
for(x = 0; x < avctx->width; x++)
line[2*x + 1] ^= 0x80;
line += picture->linesize[0];
}
}
*data_size = sizeof(AVPicture);
return buf_size;
}
static av_cold int raw_close_decoder(AVCodecContext *avctx)
{
RawVideoContext *context = avctx->priv_data;
av_freep(&context->buffer);
return 0;
}
AVCodec ff_rawvideo_decoder = {
.name = "rawvideo",
.type = AVMEDIA_TYPE_VIDEO,
.id = CODEC_ID_RAWVIDEO,
.priv_data_size = sizeof(RawVideoContext),
.init = raw_init_decoder,
.close = raw_close_decoder,
.decode = raw_decode,
.long_name = NULL_IF_CONFIG_SMALL("raw video"),
.priv_class= &class,
};
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