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FFmpeg/libavcodec/rawdec.c
Andreas Rheinhardt 3d53cefb49 avcodec/raw: Reduce number of avpriv symbols 
libavcodec currently exports four avpriv symbols that deal with
PixelFormatTags: avpriv_get_raw_pix_fmt_tags, avpriv_find_pix_fmt,
avpriv_pix_fmt_bps_avi and avpriv_pix_fmt_bps_mov. The latter two are
lists of PixelFormatTags, the former returns such a list and the second
searches a list for a pixel format that matches a given fourcc; only
one of the aforementioned three lists is ever searched.

Yet for avpriv_pix_fmt_bps_avi, avpriv_pix_fmt_bps_mov and
avpriv_find_pix_fmt the overhead of exporting these functions actually
exceeds the size of said objects (at least for ELF; the following numbers
are for x64 Ubuntu 20.10):
The code size of avpriv_find_pix_fmt is small (GCC 10.2 37B, Clang 11 41B),
yet exporting it adds a 20B string for the name alone to the exporting
as well as to each importing library; there is more: Four bytes in the
exporting libraries .gnu.hash; two bytes each for the exporting as well
as each importing libraries .gnu.version; 24B in the exporting as well
as each importing libraries .dynsym; 16B+24B for an entry in .plt as
well as the accompanying relocation entry in .rela.plt for each
importing library.

The overhead for the lists is similar: The strings are 23B and the
.plt+.rela.plt pair is replaced by 8B+24B for an entry in .got and
a relocation entry in .rela.dyn. These lists have a size of 80 resp.
72 bytes.

Yet for ff_raw_pix_fmt_tags, exporting it is advantageous compared to
duplicating it into libavformat and potentially libavdevice. Therefore
this commit replaces all library uses of the four symbols with a single
function that is exported for shared builds. It has an enum parameter
to choose the desired list besides the parameter for the fourcc. New
lists can be supported with new enum values.

Unfortunately, avpriv_get_raw_pix_fmt_tags could not be removed, as the
fourcc2pixfmt tool uses the table of raw pix fmts. No other user of this
function remains.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
2022-01-04 13:16:49 +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 "bswapdsp.h"
#include "decode.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_pix_fmt_find(PIX_FMT_LIST_MOV,
avctx->bits_per_coded_sample);
else if (avctx->codec_tag == MKTAG('W', 'R', 'A', 'W'))
avctx->pix_fmt = avpriv_pix_fmt_find(PIX_FMT_LIST_AVI,
avctx->bits_per_coded_sample);
else if (avctx->codec_tag && (avctx->codec_tag & 0xFFFFFF) != MKTAG('B','I','T', 0))
avctx->pix_fmt = avpriv_pix_fmt_find(PIX_FMT_LIST_RAW, avctx->codec_tag);
else if (avctx->pix_fmt == AV_PIX_FMT_NONE && avctx->bits_per_coded_sample)
avctx->pix_fmt = avpriv_pix_fmt_find(PIX_FMT_LIST_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) {
context->palette = av_buffer_alloc(AVPALETTE_SIZE);
if (!context->palette)
return AVERROR(ENOMEM);
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 > 8 && 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;
frame->pkt_pos = avctx->internal->last_pkt_props->pos;
frame->pkt_duration = avctx->internal->last_pkt_props->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 ret;
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 (ff_copy_palette(context->palette->data, avpkt, avctx)) {
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) {
const uint8_t *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) {
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, y;
for (y = 0; y < avctx->height; y++) {
for (x = 0; x >> 3 < avctx->width; x += 8) {
v = AV_RB64(&dst[x]);
AV_WB64(&dst[x], v << 16 | v >> 48);
}
dst += frame->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);
av_freep(&context->bitstream_buf);
return 0;
}
const 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,
.caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
};
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