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FFmpeg/libavcodec/rawdec.c
Andreas Rheinhardt 4243da4ff4 avcodec/codec_internal: Use union for FFCodec decode/encode callbacks 
This is possible, because every given FFCodec has to implement
exactly one of these. Doing so decreases sizeof(FFCodec) and
therefore decreases the size of the binary.
Notice that in case of position-independent code the decrease
is in .data.rel.ro, so that this translates to decreased
memory consumption.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
2022-04-05 20:02:37 +02:00

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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 "codec_internal.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, AVFrame *frame,
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;
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 FFCodec ff_rawvideo_decoder = {
.p.name = "rawvideo",
.p.long_name = NULL_IF_CONFIG_SMALL("raw video"),
.p.type = AVMEDIA_TYPE_VIDEO,
.p.id = AV_CODEC_ID_RAWVIDEO,
.priv_data_size = sizeof(RawVideoContext),
.init = raw_init_decoder,
.close = raw_close_decoder,
FF_CODEC_DECODE_CB(raw_decode),
.p.priv_class = &rawdec_class,
.p.capabilities = AV_CODEC_CAP_PARAM_CHANGE,
.caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
};
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