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FFmpeg/libavcodec/rawdec.c
Peter Ross 1524b0fa68 libavcodec/rawdec: avoid memcpy when performing 16-bit samples shift 
Signed-off-by: Peter Ross <pross@xvid.org>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
2014-02-26 19:44:34 +01:00

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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 "internal.h"
#include "raw.h"
#include "libavutil/avassert.h"
#include "libavutil/buffer.h"
#include "libavutil/common.h"
#include "libavutil/intreadwrite.h"
#include "libavutil/imgutils.h"
#include "libavutil/opt.h"
typedef struct RawVideoContext {
AVClass *av_class;
AVBufferRef *palette;
int frame_size; /* size of the frame in bytes */
int flip;
int is_2_4_bpp; // 2 or 4 bpp raw in avi/mov
int is_yuv2;
int is_lt_16bpp; // 16bpp pixfmt and bits_per_coded_sample < 16
int tff;
} RawVideoContext;
static const AVOption options[]={
{"top", "top field first", offsetof(RawVideoContext, tff), AV_OPT_TYPE_INT, {.i64 = -1}, -1, 1, AV_OPT_FLAG_DECODING_PARAM|AV_OPT_FLAG_VIDEO_PARAM},
{NULL}
};
static const AVClass rawdec_class = {
.class_name = "rawdec",
.option = options,
.version = LIBAVUTIL_VERSION_INT,
};
static const PixelFormatTag pix_fmt_bps_avi[] = {
{ AV_PIX_FMT_MONOWHITE, 1 },
{ AV_PIX_FMT_PAL8, 2 },
{ AV_PIX_FMT_PAL8, 4 },
{ AV_PIX_FMT_PAL8, 8 },
{ AV_PIX_FMT_RGB444LE, 12 },
{ AV_PIX_FMT_RGB555LE, 15 },
{ AV_PIX_FMT_RGB555LE, 16 },
{ AV_PIX_FMT_BGR24, 24 },
{ AV_PIX_FMT_BGRA, 32 },
{ AV_PIX_FMT_NONE, 0 },
};
static const PixelFormatTag pix_fmt_bps_mov[] = {
{ AV_PIX_FMT_MONOWHITE, 1 },
{ AV_PIX_FMT_PAL8, 2 },
{ AV_PIX_FMT_PAL8, 4 },
{ AV_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
{ AV_PIX_FMT_RGB555BE, 16 },
{ AV_PIX_FMT_RGB24, 24 },
{ AV_PIX_FMT_ARGB, 32 },
{ AV_PIX_FMT_MONOWHITE,33 },
{ AV_PIX_FMT_NONE, 0 },
};
enum AVPixelFormat avpriv_find_pix_fmt(const PixelFormatTag *tags,
unsigned int fourcc)
{
while (tags->pix_fmt >= 0) {
if (tags->fourcc == fourcc)
return tags->pix_fmt;
tags++;
}
return AV_PIX_FMT_NONE;
}
#if LIBAVCODEC_VERSION_MAJOR < 55
enum AVPixelFormat ff_find_pix_fmt(const PixelFormatTag *tags, unsigned int fourcc)
{
return avpriv_find_pix_fmt(tags, fourcc);
}
#endif
static av_cold int raw_init_decoder(AVCodecContext *avctx)
{
RawVideoContext *context = avctx->priv_data;
const AVPixFmtDescriptor *desc;
if ( avctx->codec_tag == MKTAG('r','a','w',' ')
|| avctx->codec_tag == MKTAG('N','O','1','6'))
avctx->pix_fmt = avpriv_find_pix_fmt(pix_fmt_bps_mov,
avctx->bits_per_coded_sample & 0x1f);
else if (avctx->codec_tag == MKTAG('W', 'R', 'A', 'W'))
avctx->pix_fmt = avpriv_find_pix_fmt(pix_fmt_bps_avi,
avctx->bits_per_coded_sample);
else if (avctx->codec_tag)
avctx->pix_fmt = avpriv_find_pix_fmt(ff_raw_pix_fmt_tags, avctx->codec_tag);
else if (avctx->pix_fmt == AV_PIX_FMT_NONE && avctx->bits_per_coded_sample)
avctx->pix_fmt = avpriv_find_pix_fmt(pix_fmt_bps_avi,
avctx->bits_per_coded_sample);
desc = av_pix_fmt_desc_get(avctx->pix_fmt);
if (!desc) {
av_log(avctx, AV_LOG_ERROR, "Invalid pixel format.\n");
return AVERROR(EINVAL);
}
if (desc->flags & (AV_PIX_FMT_FLAG_PAL | AV_PIX_FMT_FLAG_PSEUDOPAL)) {
context->palette = av_buffer_alloc(AVPALETTE_SIZE);
if (!context->palette)
return AVERROR(ENOMEM);
if (desc->flags & AV_PIX_FMT_FLAG_PSEUDOPAL)
avpriv_set_systematic_pal2((uint32_t*)context->palette->data, avctx->pix_fmt);
else
memset(context->palette->data, 0, AVPALETTE_SIZE);
}
if (((avctx->bits_per_coded_sample & 0x1f) == 4 || (avctx->bits_per_coded_sample & 0x1f) == 2) &&
avctx->pix_fmt == AV_PIX_FMT_PAL8 &&
(!avctx->codec_tag || avctx->codec_tag == MKTAG('r','a','w',' '))) {
context->is_2_4_bpp = 1;
context->frame_size = avpicture_get_size(avctx->pix_fmt,
FFALIGN(avctx->width, 16),
avctx->height);
} else {
context->is_lt_16bpp = av_get_bits_per_pixel(desc) == 16 && avctx->bits_per_coded_sample && avctx->bits_per_coded_sample < 16;
context->frame_size = avpicture_get_size(avctx->pix_fmt, avctx->width,
avctx->height);
}
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;
if (avctx->codec_tag == AV_RL32("yuv2") &&
avctx->pix_fmt == AV_PIX_FMT_YUYV422)
context->is_yuv2 = 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 *got_frame,
AVPacket *avpkt)
{
const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(avctx->pix_fmt);
RawVideoContext *context = avctx->priv_data;
const uint8_t *buf = avpkt->data;
int buf_size = avpkt->size;
int linesize_align = 4;
int res, len;
int need_copy = !avpkt->buf || context->is_2_4_bpp || context->is_yuv2 || context->is_lt_16bpp;
AVFrame *frame = data;
AVPicture *picture = data;
frame->pict_type = AV_PICTURE_TYPE_I;
frame->key_frame = 1;
frame->reordered_opaque = avctx->reordered_opaque;
frame->pkt_pts = avctx->internal->pkt->pts;
av_frame_set_pkt_pos (frame, avctx->internal->pkt->pos);
av_frame_set_pkt_duration(frame, avctx->internal->pkt->duration);
if (context->tff >= 0) {
frame->interlaced_frame = 1;
frame->top_field_first = context->tff;
}
if ((res = av_image_check_size(avctx->width, avctx->height, 0, avctx)) < 0)
return res;
if (need_copy)
frame->buf[0] = av_buffer_alloc(FFMAX(context->frame_size, buf_size));
else
frame->buf[0] = av_buffer_ref(avpkt->buf);
if (!frame->buf[0])
return AVERROR(ENOMEM);
//2bpp and 4bpp raw in avi and mov (yes this is ugly ...)
if (context->is_2_4_bpp) {
int i;
uint8_t *dst = frame->buf[0]->data;
buf_size = context->frame_size - AVPALETTE_SIZE;
if ((avctx->bits_per_coded_sample & 0x1f) == 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 {
av_assert0((avctx->bits_per_coded_sample & 0x1f) == 2);
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;
} else if (context->is_lt_16bpp) {
int i;
uint8_t *dst = frame->buf[0]->data;
if (desc->flags & AV_PIX_FMT_FLAG_BE) {
for (i = 0; i + 1 < buf_size; i += 2)
AV_WB16(dst + i, AV_RB16(buf + i) << (16 - avctx->bits_per_coded_sample));
} else {
for (i = 0; i + 1 < buf_size; i += 2)
AV_WL16(dst + i, AV_RL16(buf + i) << (16 - avctx->bits_per_coded_sample));
}
buf = dst;
} else if (need_copy) {
memcpy(frame->buf[0]->data, buf, buf_size);
buf = frame->buf[0]->data;
}
if (avctx->codec_tag == MKTAG('A', 'V', '1', 'x') ||
avctx->codec_tag == MKTAG('A', 'V', 'u', 'p'))
buf += buf_size - context->frame_size;
len = context->frame_size - (avctx->pix_fmt==AV_PIX_FMT_PAL8 ? AVPALETTE_SIZE : 0);
if (buf_size < len) {
av_log(avctx, AV_LOG_ERROR, "Invalid buffer size, packet size %d < expected frame_size %d\n", buf_size, len);
av_buffer_unref(&frame->buf[0]);
return AVERROR(EINVAL);
}
if ((res = avpicture_fill(picture, buf, avctx->pix_fmt,
avctx->width, avctx->height)) < 0) {
av_buffer_unref(&frame->buf[0]);
return res;
}
if (avctx->pix_fmt == AV_PIX_FMT_PAL8) {
const uint8_t *pal = av_packet_get_side_data(avpkt, AV_PKT_DATA_PALETTE,
NULL);
if (pal) {
av_buffer_unref(&context->palette);
context->palette = av_buffer_alloc(AVPALETTE_SIZE);
if (!context->palette) {
av_buffer_unref(&frame->buf[0]);
return AVERROR(ENOMEM);
}
memcpy(context->palette->data, pal, AVPALETTE_SIZE);
frame->palette_has_changed = 1;
}
}
if ((avctx->pix_fmt==AV_PIX_FMT_BGR24 ||
avctx->pix_fmt==AV_PIX_FMT_GRAY8 ||
avctx->pix_fmt==AV_PIX_FMT_RGB555LE ||
avctx->pix_fmt==AV_PIX_FMT_RGB555BE ||
avctx->pix_fmt==AV_PIX_FMT_RGB565LE ||
avctx->pix_fmt==AV_PIX_FMT_MONOWHITE ||
avctx->pix_fmt==AV_PIX_FMT_PAL8) &&
FFALIGN(frame->linesize[0], linesize_align) * avctx->height <= buf_size)
frame->linesize[0] = FFALIGN(frame->linesize[0], linesize_align);
if (avctx->pix_fmt == AV_PIX_FMT_NV12 && avctx->codec_tag == MKTAG('N', 'V', '1', '2') &&
FFALIGN(frame->linesize[0], linesize_align) * avctx->height +
FFALIGN(frame->linesize[1], linesize_align) * ((avctx->height + 1) / 2) <= buf_size) {
int la0 = FFALIGN(frame->linesize[0], linesize_align);
frame->data[1] += (la0 - frame->linesize[0]) * avctx->height;
frame->linesize[0] = la0;
frame->linesize[1] = FFALIGN(frame->linesize[1], linesize_align);
}
if ((avctx->pix_fmt == AV_PIX_FMT_PAL8 && buf_size < context->frame_size) ||
(desc->flags & AV_PIX_FMT_FLAG_PSEUDOPAL)) {
frame->buf[1] = av_buffer_ref(context->palette);
if (!frame->buf[1]) {
av_buffer_unref(&frame->buf[0]);
return AVERROR(ENOMEM);
}
frame->data[1] = frame->buf[1]->data;
}
if (avctx->pix_fmt == AV_PIX_FMT_BGR24 &&
((frame->linesize[0] + 3) & ~3) * avctx->height <= buf_size)
frame->linesize[0] = (frame->linesize[0] + 3) & ~3;
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("I420") && (avctx->width+1)*(avctx->height+1) * 3/2 == buf_size) {
picture->data[1] = picture->data[1] + (avctx->width+1)*(avctx->height+1) -avctx->width*avctx->height;
picture->data[2] = picture->data[2] + ((avctx->width+1)*(avctx->height+1) -avctx->width*avctx->height)*5/4;
}
if (avctx->codec_tag == AV_RL32("yuv2") &&
avctx->pix_fmt == AV_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];
}
}
if (avctx->codec_tag == AV_RL32("YVYU") &&
avctx->pix_fmt == AV_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 - 1; x += 2)
FFSWAP(uint8_t, line[2*x + 1], line[2*x + 3]);
line += picture->linesize[0];
}
}
if (avctx->field_order > AV_FIELD_PROGRESSIVE) { /* we have interlaced material flagged in container */
frame->interlaced_frame = 1;
if (avctx->field_order == AV_FIELD_TT || avctx->field_order == AV_FIELD_TB)
frame->top_field_first = 1;
}
*got_frame = 1;
return buf_size;
}
static av_cold int raw_close_decoder(AVCodecContext *avctx)
{
RawVideoContext *context = avctx->priv_data;
av_buffer_unref(&context->palette);
return 0;
}
AVCodec ff_rawvideo_decoder = {
.name = "rawvideo",
.long_name = NULL_IF_CONFIG_SMALL("raw video"),
.type = AVMEDIA_TYPE_VIDEO,
.id = AV_CODEC_ID_RAWVIDEO,
.priv_data_size = sizeof(RawVideoContext),
.init = raw_init_decoder,
.close = raw_close_decoder,
.decode = raw_decode,
.priv_class = &rawdec_class,
};
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