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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 "bswapdsp.h"
#include "get_bits.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_1_2_4_8_bpp; // 1, 2, 4 and 8 bpp in avi/mov, 1 and 8 bpp in nut
int is_mono;
int is_pal8;
int is_nut_mono;
int is_nut_pal8;
int is_yuv2;
int is_lt_16bpp; // 16bpp pixfmt and bits_per_coded_sample < 16
int tff;
BswapDSPContext bbdsp;
void *bitstream_buf;
unsigned int bitstream_buf_size;
} RawVideoContext;
static const AVOption options[]={
{"top", "top field first", offsetof(RawVideoContext, tff), AV_OPT_TYPE_BOOL, {.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 av_cold int raw_init_decoder(AVCodecContext *avctx)
{
RawVideoContext *context = avctx->priv_data;
const AVPixFmtDescriptor *desc;
ff_bswapdsp_init(&context->bbdsp);
if ( avctx->codec_tag == MKTAG('r','a','w',' ')
|| avctx->codec_tag == MKTAG('N','O','1','6'))
avctx->pix_fmt = avpriv_find_pix_fmt(avpriv_pix_fmt_bps_mov,
avctx->bits_per_coded_sample);
else if (avctx->codec_tag == MKTAG('W', 'R', 'A', 'W'))
avctx->pix_fmt = avpriv_find_pix_fmt(avpriv_pix_fmt_bps_avi,
avctx->bits_per_coded_sample);
else if (avctx->codec_tag && (avctx->codec_tag & 0xFFFFFF) != MKTAG('B','I','T', 0))
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(avpriv_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 == 1)
memset(context->palette->data, 0xff, 4);
}
}
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->pix_fmt == AV_PIX_FMT_MONOWHITE ||
avctx->pix_fmt == AV_PIX_FMT_MONOBLACK)
context->is_mono = 1;
else if (avctx->pix_fmt == AV_PIX_FMT_PAL8)
context->is_pal8 = 1;
if (avctx->codec_tag == MKTAG('B','1','W','0') ||
avctx->codec_tag == MKTAG('B','0','W','1'))
context->is_nut_mono = 1;
else if (avctx->codec_tag == MKTAG('P','A','L',8))
context->is_nut_pal8 = 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, AVFrame *frame)
{
frame->data[0] += frame->linesize[0] * (avctx->height - 1);
frame->linesize[0] *= -1;
}
/*
* Scale sample to 16-bit resolution
*/
#define SCALE16(x, bits) (((x) << (16 - (bits))) | ((x) >> (2 * (bits) - 16)))
/**
* Scale buffer to 16 bits per coded sample resolution
*/
#define MKSCALE16(name, r16, w16) \
static void name(AVCodecContext *avctx, uint8_t * dst, const uint8_t *buf, int buf_size, int packed) \
{ \
int i; \
if (!packed) { \
for (i = 0; i + 1 < buf_size; i += 2) \
w16(dst + i, SCALE16(r16(buf + i), avctx->bits_per_coded_sample)); \
} else { \
GetBitContext gb; \
init_get_bits(&gb, buf, buf_size * 8); \
for (i = 0; i < avctx->width * avctx->height; i++) { \
int sample = get_bits(&gb, avctx->bits_per_coded_sample); \
w16(dst + i*2, SCALE16(sample, avctx->bits_per_coded_sample)); \
} \
} \
}
MKSCALE16(scale16be, AV_RB16, AV_WB16)
MKSCALE16(scale16le, AV_RL16, AV_WL16)
static int raw_decode(AVCodecContext *avctx, void *data, int *got_frame,
AVPacket *avpkt)
{
const AVPixFmtDescriptor *desc;
RawVideoContext *context = avctx->priv_data;
const uint8_t *buf = avpkt->data;
int buf_size = avpkt->size;
int linesize_align = 4;
int stride;
int res, len;
int need_copy;
AVFrame *frame = data;
if (avctx->width <= 0) {
av_log(avctx, AV_LOG_ERROR, "width is not set\n");
return AVERROR_INVALIDDATA;
}
if (avctx->height <= 0) {
av_log(avctx, AV_LOG_ERROR, "height is not set\n");
return AVERROR_INVALIDDATA;
}
if (context->is_nut_mono)
stride = avctx->width / 8 + (avctx->width & 7 ? 1 : 0);
else if (context->is_nut_pal8)
stride = avctx->width;
else
stride = avpkt->size / avctx->height;
av_log(avctx, AV_LOG_DEBUG, "PACKET SIZE: %d, STRIDE: %d\n", avpkt->size, stride);
if (stride == 0 || avpkt->size < stride * avctx->height) {
av_log(avctx, AV_LOG_ERROR, "Packet too small (%d)\n", avpkt->size);
return AVERROR_INVALIDDATA;
}
desc = av_pix_fmt_desc_get(avctx->pix_fmt);
if ((avctx->bits_per_coded_sample == 8 || avctx->bits_per_coded_sample == 4 ||
avctx->bits_per_coded_sample == 2 || avctx->bits_per_coded_sample == 1 ||
(avctx->bits_per_coded_sample == 0 && (context->is_nut_pal8 || context->is_mono)) ) &&
(context->is_mono || context->is_pal8) &&
(!avctx->codec_tag || avctx->codec_tag == MKTAG('r','a','w',' ') ||
context->is_nut_mono || context->is_nut_pal8)) {
context->is_1_2_4_8_bpp = 1;
if (context->is_mono) {
int row_bytes = avctx->width / 8 + (avctx->width & 7 ? 1 : 0);
context->frame_size = av_image_get_buffer_size(avctx->pix_fmt,
FFALIGN(row_bytes, 16) * 8,
avctx->height, 1);
} else
context->frame_size = av_image_get_buffer_size(avctx->pix_fmt,
FFALIGN(avctx->width, 16),
avctx->height, 1);
} 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 = av_image_get_buffer_size(avctx->pix_fmt, avctx->width,
avctx->height, 1);
}
if (context->frame_size < 0)
return context->frame_size;
need_copy = !avpkt->buf || context->is_1_2_4_8_bpp || context->is_yuv2 || context->is_lt_16bpp;
frame->pict_type = AV_PICTURE_TYPE_I;
frame->key_frame = 1;
res = ff_decode_frame_props(avctx, frame);
if (res < 0)
return res;
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);
// 1, 2, 4 and 8 bpp in avi/mov, 1 and 8 bpp in nut
if (context->is_1_2_4_8_bpp) {
int i, j, row_pix = 0;
uint8_t *dst = frame->buf[0]->data;
buf_size = context->frame_size - (context->is_pal8 ? AVPALETTE_SIZE : 0);
if (avctx->bits_per_coded_sample == 8 || context->is_nut_pal8 || context->is_mono) {
int pix_per_byte = context->is_mono ? 8 : 1;
for (i = 0, j = 0; j < buf_size && i<avpkt->size; i++, j++) {
dst[j] = buf[i];
row_pix += pix_per_byte;
if (row_pix >= avctx->width) {
i += stride - (i % stride) - 1;
j += 16 - (j % 16) - 1;
row_pix = 0;
}
}
} else if (avctx->bits_per_coded_sample == 4) {
for (i = 0, j = 0; 2 * j + 1 < buf_size && i<avpkt->size; i++, j++) {
dst[2 * j + 0] = buf[i] >> 4;
dst[2 * j + 1] = buf[i] & 15;
row_pix += 2;
if (row_pix >= avctx->width) {
i += stride - (i % stride) - 1;
j += 8 - (j % 8) - 1;
row_pix = 0;
}
}
} else if (avctx->bits_per_coded_sample == 2) {
for (i = 0, j = 0; 4 * j + 3 < buf_size && i<avpkt->size; i++, j++) {
dst[4 * j + 0] = buf[i] >> 6;
dst[4 * j + 1] = buf[i] >> 4 & 3;
dst[4 * j + 2] = buf[i] >> 2 & 3;
dst[4 * j + 3] = buf[i] & 3;
row_pix += 4;
if (row_pix >= avctx->width) {
i += stride - (i % stride) - 1;
j += 4 - (j % 4) - 1;
row_pix = 0;
}
}
} else {
av_assert0(avctx->bits_per_coded_sample == 1);
for (i = 0, j = 0; 8 * j + 7 < buf_size && i<avpkt->size; i++, j++) {
dst[8 * j + 0] = buf[i] >> 7;
dst[8 * j + 1] = buf[i] >> 6 & 1;
dst[8 * j + 2] = buf[i] >> 5 & 1;
dst[8 * j + 3] = buf[i] >> 4 & 1;
dst[8 * j + 4] = buf[i] >> 3 & 1;
dst[8 * j + 5] = buf[i] >> 2 & 1;
dst[8 * j + 6] = buf[i] >> 1 & 1;
dst[8 * j + 7] = buf[i] & 1;
row_pix += 8;
if (row_pix >= avctx->width) {
i += stride - (i % stride) - 1;
j += 2 - (j % 2) - 1;
row_pix = 0;
}
}
}
linesize_align = 16;
buf = dst;
} else if (context->is_lt_16bpp) {
uint8_t *dst = frame->buf[0]->data;
int packed = (avctx->codec_tag & 0xFFFFFF) == MKTAG('B','I','T', 0);
int swap = avctx->codec_tag >> 24;
if (packed && swap) {
av_fast_padded_malloc(&context->bitstream_buf, &context->bitstream_buf_size, buf_size);
if (!context->bitstream_buf)
return AVERROR(ENOMEM);
if (swap == 16)
context->bbdsp.bswap16_buf(context->bitstream_buf, (const uint16_t*)buf, buf_size / 2);
else if (swap == 32)
context->bbdsp.bswap_buf(context->bitstream_buf, (const uint32_t*)buf, buf_size / 4);
else
return AVERROR_INVALIDDATA;
buf = context->bitstream_buf;
}
if (desc->flags & AV_PIX_FMT_FLAG_BE)
scale16be(avctx, dst, buf, buf_size, packed);
else
scale16le(avctx, dst, buf, buf_size, packed);
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 && ((avctx->codec_tag & 0xFFFFFF) != MKTAG('B','I','T', 0) || !need_copy)) {
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 = av_image_fill_arrays(frame->data, frame->linesize,
buf, avctx->pix_fmt,
avctx->width, avctx->height, 1)) < 0) {
av_buffer_unref(&frame->buf[0]);
return res;
}
if (avctx->pix_fmt == AV_PIX_FMT_PAL8) {
int pal_size;
const uint8_t *pal = av_packet_get_side_data(avpkt, AV_PKT_DATA_PALETTE,
&pal_size);
int ret;
if (pal_size != AVPALETTE_SIZE) {
av_log(avctx, AV_LOG_ERROR, "Palette size %d is wrong\n", pal_size);
pal = NULL;
}
if (!context->palette)
context->palette = av_buffer_alloc(AVPALETTE_SIZE);
if (!context->palette) {
av_buffer_unref(&frame->buf[0]);
return AVERROR(ENOMEM);
}
ret = av_buffer_make_writable(&context->palette);
if (ret < 0) {
av_buffer_unref(&frame->buf[0]);
return ret;
}
if (pal) {
memcpy(context->palette->data, pal, AVPALETTE_SIZE);
frame->palette_has_changed = 1;
} else if (context->is_nut_pal8) {
int vid_size = avctx->width * avctx->height;
int pal_size = avpkt->size - vid_size;
if (avpkt->size > vid_size && pal_size <= AVPALETTE_SIZE) {
pal = avpkt->data + vid_size;
memcpy(context->palette->data, pal, pal_size);
frame->palette_has_changed = 1;
}
}
}
if ((avctx->pix_fmt==AV_PIX_FMT_RGB24 ||
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_MONOBLACK ||
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, frame);
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 *, frame->data[1], frame->data[2]);
if (avctx->codec_tag == AV_RL32("I420") && (avctx->width+1)*(avctx->height+1) * 3/2 == buf_size) {
frame->data[1] = frame->data[1] + (avctx->width+1)*(avctx->height+1) -avctx->width*avctx->height;
frame->data[2] = frame->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 = frame->data[0];
for (y = 0; y < avctx->height; y++) {
for (x = 0; x < avctx->width; x++)
line[2 * x + 1] ^= 0x80;
line += frame->linesize[0];
}
}
if (avctx->codec_tag == AV_RL32("b64a") &&
avctx->pix_fmt == AV_PIX_FMT_RGBA64BE) {
uint8_t *dst = frame->data[0];
uint64_t v;
int x;
for (x = 0; x >> 3 < avctx->width * avctx->height; x += 8) {
v = AV_RB64(&dst[x]);
AV_WB64(&dst[x], v << 16 | v >> 48);
}
}
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,
.capabilities = AV_CODEC_CAP_PARAM_CHANGE,
};