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FFmpeg/libavcodec/rv10.c
Andreas Rheinhardt 64d2bca452 avcodec/rv10: Avoid indirection 
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
2024-06-20 18:58:39 +02:00

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/*
* RV10/RV20 decoder
* Copyright (c) 2000,2001 Fabrice Bellard
* Copyright (c) 2002-2004 Michael Niedermayer
*
* 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
* RV10/RV20 decoder
*/
#include <inttypes.h>
#include "libavutil/imgutils.h"
#include "libavutil/thread.h"
#include "avcodec.h"
#include "codec_internal.h"
#include "decode.h"
#include "error_resilience.h"
#include "h263.h"
#include "h263data.h"
#include "h263dec.h"
#include "mpeg_er.h"
#include "mpegvideo.h"
#include "mpegvideodec.h"
#include "mpeg4video.h"
#include "mpegvideodata.h"
#include "rv10dec.h"
#define RV_GET_MAJOR_VER(x) ((x) >> 28)
#define RV_GET_MINOR_VER(x) (((x) >> 20) & 0xFF)
#define RV_GET_MICRO_VER(x) (((x) >> 12) & 0xFF)
#define MAX_VLC_ENTRIES 1023 // Note: Does not include the skip entries.
#define DC_VLC_BITS 9
typedef struct RVDecContext {
MpegEncContext m;
int sub_id;
int orig_width, orig_height;
} RVDecContext;
/* (run, length) encoded value for the symbols table. The actual symbols
* are run..run - length (mod 256).
* The last two entries in the following table apply to luma only.
* The skip values are not included in this list. */
static const uint8_t rv_sym_run_len[][2] = {
{ 0, 0 }, { 1, 0 }, { 255, 0 }, { 3, 1 }, { 254, 1 },
{ 7, 3 }, { 252, 3 }, { 15, 7 }, { 248, 7 }, { 31, 15 },
{ 240, 15 }, { 63, 31 }, { 224, 31 }, { 127, 63 }, { 192, 63 },
{ 255, 127 }, { 128, 127 }, { 127, 255 }, { 128, 255 },
};
/* entry[i] of the following tables gives
* the number of VLC codes of length i + 2. */
static const uint16_t rv_lum_len_count[15] = {
1, 0, 2, 4, 8, 16, 32, 0, 64, 0, 128, 0, 256, 0, 512,
};
static const uint16_t rv_chrom_len_count[15] = {
1, 2, 4, 0, 8, 0, 16, 0, 32, 0, 64, 0, 128, 0, 256,
};
static VLC rv_dc_lum, rv_dc_chrom;
int ff_rv_decode_dc(MpegEncContext *s, int n)
{
int code;
if (n < 4) {
code = get_vlc2(&s->gb, rv_dc_lum.table, DC_VLC_BITS, 2);
} else {
code = get_vlc2(&s->gb, rv_dc_chrom.table, DC_VLC_BITS, 2);
if (code < 0) {
av_log(s->avctx, AV_LOG_ERROR, "chroma dc error\n");
return -1;
}
}
return code;
}
/* read RV 1.0 compatible frame header */
static int rv10_decode_picture_header(MpegEncContext *s)
{
int mb_count, pb_frame, marker, mb_xy;
marker = get_bits1(&s->gb);
if (get_bits1(&s->gb))
s->pict_type = AV_PICTURE_TYPE_P;
else
s->pict_type = AV_PICTURE_TYPE_I;
if (!marker)
av_log(s->avctx, AV_LOG_ERROR, "marker missing\n");
pb_frame = get_bits1(&s->gb);
ff_dlog(s->avctx, "pict_type=%d pb_frame=%d\n", s->pict_type, pb_frame);
if (pb_frame) {
avpriv_request_sample(s->avctx, "PB-frame");
return AVERROR_PATCHWELCOME;
}
s->qscale = get_bits(&s->gb, 5);
if (s->qscale == 0) {
av_log(s->avctx, AV_LOG_ERROR, "Invalid qscale value: 0\n");
return AVERROR_INVALIDDATA;
}
if (s->pict_type == AV_PICTURE_TYPE_I) {
if (s->rv10_version == 3) {
/* specific MPEG like DC coding not used */
s->last_dc[0] = get_bits(&s->gb, 8);
s->last_dc[1] = get_bits(&s->gb, 8);
s->last_dc[2] = get_bits(&s->gb, 8);
ff_dlog(s->avctx, "DC:%d %d %d\n", s->last_dc[0],
s->last_dc[1], s->last_dc[2]);
}
}
/* if multiple packets per frame are sent, the position at which
* to display the macroblocks is coded here */
mb_xy = s->mb_x + s->mb_y * s->mb_width;
if (show_bits(&s->gb, 12) == 0 || (mb_xy && mb_xy < s->mb_num)) {
s->mb_x = get_bits(&s->gb, 6); /* mb_x */
s->mb_y = get_bits(&s->gb, 6); /* mb_y */
mb_count = get_bits(&s->gb, 12);
} else {
s->mb_x = 0;
s->mb_y = 0;
mb_count = s->mb_width * s->mb_height;
}
skip_bits(&s->gb, 3); /* ignored */
s->f_code = 1;
return mb_count;
}
static int rv20_decode_picture_header(RVDecContext *rv, int whole_size)
{
static const enum AVPictureType pict_types[] =
{ AV_PICTURE_TYPE_I, AV_PICTURE_TYPE_I /* hmm ... */,
AV_PICTURE_TYPE_P, AV_PICTURE_TYPE_B };
MpegEncContext *s = &rv->m;
int seq, mb_pos, ret;
int rpr_max;
s->pict_type = pict_types[get_bits(&s->gb, 2)];
if (s->low_delay && s->pict_type == AV_PICTURE_TYPE_B) {
av_log(s->avctx, AV_LOG_ERROR, "low delay B\n");
return -1;
}
if (!s->last_pic.ptr && s->pict_type == AV_PICTURE_TYPE_B) {
av_log(s->avctx, AV_LOG_ERROR, "early B-frame\n");
return AVERROR_INVALIDDATA;
}
if (get_bits1(&s->gb)) {
av_log(s->avctx, AV_LOG_ERROR, "reserved bit set\n");
return AVERROR_INVALIDDATA;
}
s->qscale = get_bits(&s->gb, 5);
if (s->qscale == 0) {
av_log(s->avctx, AV_LOG_ERROR, "Invalid qscale value: 0\n");
return AVERROR_INVALIDDATA;
}
if (RV_GET_MINOR_VER(rv->sub_id) >= 2)
s->loop_filter = get_bits1(&s->gb) && !s->avctx->lowres;
if (RV_GET_MINOR_VER(rv->sub_id) <= 1)
seq = get_bits(&s->gb, 8) << 7;
else
seq = get_bits(&s->gb, 13) << 2;
rpr_max = s->avctx->extradata[1] & 7;
if (rpr_max) {
int f, new_w, new_h;
int rpr_bits = av_log2(rpr_max) + 1;
f = get_bits(&s->gb, rpr_bits);
if (f) {
if (s->avctx->extradata_size < 8 + 2 * f) {
av_log(s->avctx, AV_LOG_ERROR, "Extradata too small.\n");
return AVERROR_INVALIDDATA;
}
new_w = 4 * ((uint8_t *) s->avctx->extradata)[6 + 2 * f];
new_h = 4 * ((uint8_t *) s->avctx->extradata)[7 + 2 * f];
} else {
new_w = rv->orig_width;
new_h = rv->orig_height;
}
if (new_w != s->width || new_h != s->height || !s->context_initialized) {
AVRational old_aspect = s->avctx->sample_aspect_ratio;
av_log(s->avctx, AV_LOG_DEBUG,
"attempting to change resolution to %dx%d\n", new_w, new_h);
if (av_image_check_size(new_w, new_h, 0, s->avctx) < 0)
return AVERROR_INVALIDDATA;
if (whole_size < (new_w + 15)/16 * ((new_h + 15)/16) / 8)
return AVERROR_INVALIDDATA;
ff_mpv_common_end(s);
// attempt to keep aspect during typical resolution switches
if (!old_aspect.num)
old_aspect = (AVRational){1, 1};
if (2 * (int64_t)new_w * s->height == (int64_t)new_h * s->width)
s->avctx->sample_aspect_ratio = av_mul_q(old_aspect, (AVRational){2, 1});
if ((int64_t)new_w * s->height == 2 * (int64_t)new_h * s->width)
s->avctx->sample_aspect_ratio = av_mul_q(old_aspect, (AVRational){1, 2});
ret = ff_set_dimensions(s->avctx, new_w, new_h);
if (ret < 0)
return ret;
s->width = new_w;
s->height = new_h;
if ((ret = ff_mpv_common_init(s)) < 0)
return ret;
}
if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
av_log(s->avctx, AV_LOG_DEBUG, "F %d/%d/%d\n", f, rpr_bits, rpr_max);
}
}
if (av_image_check_size(s->width, s->height, 0, s->avctx) < 0)
return AVERROR_INVALIDDATA;
mb_pos = ff_h263_decode_mba(s);
seq |= s->time & ~0x7FFF;
if (seq - s->time > 0x4000)
seq -= 0x8000;
if (seq - s->time < -0x4000)
seq += 0x8000;
if (seq != s->time) {
if (s->pict_type != AV_PICTURE_TYPE_B) {
s->time = seq;
s->pp_time = s->time - s->last_non_b_time;
s->last_non_b_time = s->time;
} else {
s->time = seq;
s->pb_time = s->pp_time - (s->last_non_b_time - s->time);
}
}
if (s->pict_type == AV_PICTURE_TYPE_B) {
if (s->pp_time <=s->pb_time || s->pp_time <= s->pp_time - s->pb_time || s->pp_time<=0) {
av_log(s->avctx, AV_LOG_DEBUG,
"messed up order, possible from seeking? skipping current B-frame\n");
#define ERROR_SKIP_FRAME -123
return ERROR_SKIP_FRAME;
}
ff_mpeg4_init_direct_mv(s);
}
s->no_rounding = get_bits1(&s->gb);
if (RV_GET_MINOR_VER(rv->sub_id) <= 1 && s->pict_type == AV_PICTURE_TYPE_B)
// binary decoder reads 3+2 bits here but they don't seem to be used
skip_bits(&s->gb, 5);
s->f_code = 1;
s->h263_aic = s->pict_type == AV_PICTURE_TYPE_I;
s->modified_quant = 1;
if (!s->avctx->lowres)
s->loop_filter = 1;
if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
av_log(s->avctx, AV_LOG_INFO,
"num:%5d x:%2d y:%2d type:%d qscale:%2d rnd:%d\n",
seq, s->mb_x, s->mb_y, s->pict_type, s->qscale,
s->no_rounding);
}
av_assert0(s->pict_type != AV_PICTURE_TYPE_B || !s->low_delay);
return s->mb_width * s->mb_height - mb_pos;
}
static av_cold void rv10_build_vlc(VLC *vlc, const uint16_t len_count[15],
const uint8_t sym_rl[][2], int sym_rl_elems)
{
uint16_t syms[MAX_VLC_ENTRIES];
uint8_t lens[MAX_VLC_ENTRIES];
unsigned nb_syms = 0, nb_lens = 0;
for (unsigned i = 0; i < sym_rl_elems; i++) {
unsigned cur_sym = sym_rl[i][0];
for (unsigned tmp = nb_syms + sym_rl[i][1]; nb_syms <= tmp; nb_syms++)
syms[nb_syms] = 0xFF & cur_sym--;
}
for (unsigned i = 0; i < 15; i++)
for (unsigned tmp = nb_lens + len_count[i]; nb_lens < tmp; nb_lens++)
lens[nb_lens] = i + 2;
av_assert1(nb_lens == nb_syms);
ff_vlc_init_from_lengths(vlc, DC_VLC_BITS, nb_lens, lens, 1,
syms, 2, 2, 0, VLC_INIT_STATIC_OVERLONG, NULL);
}
static av_cold void rv10_init_static(void)
{
static VLCElem table[1472 + 992];
rv_dc_lum.table = table;
rv_dc_lum.table_allocated = 1472;
rv10_build_vlc(&rv_dc_lum, rv_lum_len_count,
rv_sym_run_len, FF_ARRAY_ELEMS(rv_sym_run_len));
for (int i = 0; i < 1 << (DC_VLC_BITS - 7 /* Length of skip prefix */); i++) {
/* All codes beginning with 0x7F have the same length and value.
* Modifying the table directly saves us the useless subtables. */
rv_dc_lum.table[(0x7F << (DC_VLC_BITS - 7)) + i].sym = 255;
rv_dc_lum.table[(0x7F << (DC_VLC_BITS - 7)) + i].len = 18;
}
rv_dc_chrom.table = &table[1472];
rv_dc_chrom.table_allocated = 992;
rv10_build_vlc(&rv_dc_chrom, rv_chrom_len_count,
rv_sym_run_len, FF_ARRAY_ELEMS(rv_sym_run_len) - 2);
for (int i = 0; i < 1 << (DC_VLC_BITS - 9 /* Length of skip prefix */); i++) {
/* Same as above. */
rv_dc_chrom.table[(0x1FE << (DC_VLC_BITS - 9)) + i].sym = 255;
rv_dc_chrom.table[(0x1FE << (DC_VLC_BITS - 9)) + i].len = 18;
}
}
static av_cold int rv10_decode_init(AVCodecContext *avctx)
{
static AVOnce init_static_once = AV_ONCE_INIT;
RVDecContext *rv = avctx->priv_data;
MpegEncContext *s = &rv->m;
int major_ver, minor_ver, micro_ver, ret;
if (avctx->extradata_size < 8) {
av_log(avctx, AV_LOG_ERROR, "Extradata is too small.\n");
return AVERROR_INVALIDDATA;
}
if ((ret = av_image_check_size(avctx->coded_width,
avctx->coded_height, 0, avctx)) < 0)
return ret;
ret = ff_h263_decode_init(avctx);
if (ret < 0)
return ret;
rv->orig_width = avctx->coded_width;
rv->orig_height = avctx->coded_height;
s->h263_long_vectors = ((uint8_t *) avctx->extradata)[3] & 1;
rv->sub_id = AV_RB32((uint8_t *) avctx->extradata + 4);
major_ver = RV_GET_MAJOR_VER(rv->sub_id);
minor_ver = RV_GET_MINOR_VER(rv->sub_id);
micro_ver = RV_GET_MICRO_VER(rv->sub_id);
switch (major_ver) {
case 1:
s->rv10_version = micro_ver ? 3 : 1;
s->obmc = micro_ver == 2;
break;
case 2:
if (minor_ver >= 2) {
s->low_delay = 0;
avctx->has_b_frames = 1;
}
break;
default:
av_log(avctx, AV_LOG_ERROR, "unknown header %X\n", rv->sub_id);
avpriv_request_sample(avctx, "RV1/2 version");
return AVERROR_PATCHWELCOME;
}
if (avctx->debug & FF_DEBUG_PICT_INFO) {
av_log(avctx, AV_LOG_DEBUG, "ver:%X ver0:%"PRIX32"\n", rv->sub_id,
((uint32_t *) avctx->extradata)[0]);
}
/* init static VLCs */
ff_thread_once(&init_static_once, rv10_init_static);
return 0;
}
static int rv10_decode_packet(AVCodecContext *avctx, const uint8_t *buf,
int buf_size, int buf_size2, int whole_size)
{
RVDecContext *rv = avctx->priv_data;
MpegEncContext *s = &rv->m;
int mb_count, mb_pos, left, start_mb_x, active_bits_size, ret;
active_bits_size = buf_size * 8;
init_get_bits(&s->gb, buf, FFMAX(buf_size, buf_size2) * 8);
if (s->codec_id == AV_CODEC_ID_RV10)
mb_count = rv10_decode_picture_header(s);
else
mb_count = rv20_decode_picture_header(rv, whole_size);
if (mb_count < 0) {
if (mb_count != ERROR_SKIP_FRAME)
av_log(s->avctx, AV_LOG_ERROR, "HEADER ERROR\n");
return AVERROR_INVALIDDATA;
}
if (s->mb_x >= s->mb_width ||
s->mb_y >= s->mb_height) {
av_log(s->avctx, AV_LOG_ERROR, "POS ERROR %d %d\n", s->mb_x, s->mb_y);
return AVERROR_INVALIDDATA;
}
mb_pos = s->mb_y * s->mb_width + s->mb_x;
left = s->mb_width * s->mb_height - mb_pos;
if (mb_count > left) {
av_log(s->avctx, AV_LOG_ERROR, "COUNT ERROR\n");
return AVERROR_INVALIDDATA;
}
if (whole_size < s->mb_width * s->mb_height / 8)
return AVERROR_INVALIDDATA;
if ((s->mb_x == 0 && s->mb_y == 0) || !s->cur_pic.ptr) {
// FIXME write parser so we always have complete frames?
if (s->cur_pic.ptr) {
ff_er_frame_end(&s->er, NULL);
ff_mpv_frame_end(s);
s->mb_x = s->mb_y = s->resync_mb_x = s->resync_mb_y = 0;
}
if ((ret = ff_mpv_frame_start(s, avctx)) < 0)
return ret;
ff_mpeg_er_frame_start(s);
} else {
if (s->cur_pic.ptr->f->pict_type != s->pict_type) {
av_log(s->avctx, AV_LOG_ERROR, "Slice type mismatch\n");
return AVERROR_INVALIDDATA;
}
}
ff_dlog(avctx, "qscale=%d\n", s->qscale);
/* default quantization values */
if (s->codec_id == AV_CODEC_ID_RV10) {
if (s->mb_y == 0)
s->first_slice_line = 1;
} else {
s->first_slice_line = 1;
s->resync_mb_x = s->mb_x;
}
start_mb_x = s->mb_x;
s->resync_mb_y = s->mb_y;
if (s->h263_aic) {
s->y_dc_scale_table =
s->c_dc_scale_table = ff_aic_dc_scale_table;
} else {
s->y_dc_scale_table =
s->c_dc_scale_table = ff_mpeg1_dc_scale_table;
}
if (s->modified_quant)
s->chroma_qscale_table = ff_h263_chroma_qscale_table;
ff_set_qscale(s, s->qscale);
s->rv10_first_dc_coded[0] = 0;
s->rv10_first_dc_coded[1] = 0;
s->rv10_first_dc_coded[2] = 0;
ff_init_block_index(s);
/* decode each macroblock */
for (s->mb_num_left = mb_count; s->mb_num_left > 0; s->mb_num_left--) {
int ret;
ff_update_block_index(s, 8, s->avctx->lowres, 1);
ff_tlog(avctx, "**mb x=%d y=%d\n", s->mb_x, s->mb_y);
s->mv_dir = MV_DIR_FORWARD;
s->mv_type = MV_TYPE_16X16;
ret = ff_h263_decode_mb(s, s->block);
// Repeat the slice end check from ff_h263_decode_mb with our active
// bitstream size
if (ret != SLICE_ERROR && active_bits_size >= get_bits_count(&s->gb)) {
int v = show_bits(&s->gb, 16);
if (get_bits_count(&s->gb) + 16 > active_bits_size)
v >>= get_bits_count(&s->gb) + 16 - active_bits_size;
if (!v)
ret = SLICE_END;
}
if (ret != SLICE_ERROR && active_bits_size < get_bits_count(&s->gb) &&
8 * buf_size2 >= get_bits_count(&s->gb)) {
active_bits_size = buf_size2 * 8;
av_log(avctx, AV_LOG_DEBUG, "update size from %d to %d\n",
8 * buf_size, active_bits_size);
ret = SLICE_OK;
}
if (ret == SLICE_ERROR || active_bits_size < get_bits_count(&s->gb)) {
av_log(s->avctx, AV_LOG_ERROR, "ERROR at MB %d %d\n", s->mb_x,
s->mb_y);
return AVERROR_INVALIDDATA;
}
if (s->pict_type != AV_PICTURE_TYPE_B)
ff_h263_update_motion_val(s);
ff_mpv_reconstruct_mb(s, s->block);
if (s->loop_filter)
ff_h263_loop_filter(s);
if (++s->mb_x == s->mb_width) {
s->mb_x = 0;
s->mb_y++;
ff_init_block_index(s);
}
if (s->mb_x == s->resync_mb_x)
s->first_slice_line = 0;
if (ret == SLICE_END)
break;
}
ff_er_add_slice(&s->er, start_mb_x, s->resync_mb_y, s->mb_x - 1, s->mb_y,
ER_MB_END);
return active_bits_size;
}
static int get_slice_offset(AVCodecContext *avctx, const uint8_t *buf, int n)
{
return AV_RL32(buf + n * 8);
}
static int rv10_decode_frame(AVCodecContext *avctx, AVFrame *pict,
int *got_frame, AVPacket *avpkt)
{
const uint8_t *buf = avpkt->data;
int buf_size = avpkt->size;
MpegEncContext *s = avctx->priv_data;
int i, ret;
int slice_count;
const uint8_t *slices_hdr = NULL;
ff_dlog(avctx, "*****frame %"PRId64" size=%d\n", avctx->frame_num, buf_size);
/* no supplementary picture */
if (buf_size == 0) {
return 0;
}
slice_count = (*buf++) + 1;
buf_size--;
if (!slice_count || buf_size <= 8 * slice_count) {
av_log(avctx, AV_LOG_ERROR, "Invalid slice count: %d.\n",
slice_count);
return AVERROR_INVALIDDATA;
}
slices_hdr = buf + 4;
buf += 8 * slice_count;
buf_size -= 8 * slice_count;
for (i = 0; i < slice_count; i++) {
unsigned offset = get_slice_offset(avctx, slices_hdr, i);
int size, size2;
if (offset >= buf_size)
return AVERROR_INVALIDDATA;
if (i + 1 == slice_count)
size = buf_size - offset;
else
size = get_slice_offset(avctx, slices_hdr, i + 1) - offset;
if (i + 2 >= slice_count)
size2 = buf_size - offset;
else
size2 = get_slice_offset(avctx, slices_hdr, i + 2) - offset;
if (size <= 0 || size2 <= 0 ||
offset + FFMAX(size, size2) > buf_size)
return AVERROR_INVALIDDATA;
if ((ret = rv10_decode_packet(avctx, buf + offset, size, size2, buf_size)) < 0)
return ret;
if (ret > 8 * size)
i++;
}
if (s->cur_pic.ptr && s->mb_y >= s->mb_height) {
ff_er_frame_end(&s->er, NULL);
ff_mpv_frame_end(s);
if (s->pict_type == AV_PICTURE_TYPE_B || s->low_delay) {
if ((ret = av_frame_ref(pict, s->cur_pic.ptr->f)) < 0)
return ret;
ff_print_debug_info(s, s->cur_pic.ptr, pict);
ff_mpv_export_qp_table(s, pict, s->cur_pic.ptr, FF_MPV_QSCALE_TYPE_MPEG1);
} else if (s->last_pic.ptr) {
if ((ret = av_frame_ref(pict, s->last_pic.ptr->f)) < 0)
return ret;
ff_print_debug_info(s, s->last_pic.ptr, pict);
ff_mpv_export_qp_table(s, pict,s->last_pic.ptr, FF_MPV_QSCALE_TYPE_MPEG1);
}
if (s->last_pic.ptr || s->low_delay) {
*got_frame = 1;
}
// so we can detect if frame_end was not called (find some nicer solution...)
ff_mpv_unref_picture(&s->cur_pic);
}
return avpkt->size;
}
const FFCodec ff_rv10_decoder = {
.p.name = "rv10",
CODEC_LONG_NAME("RealVideo 1.0"),
.p.type = AVMEDIA_TYPE_VIDEO,
.p.id = AV_CODEC_ID_RV10,
.priv_data_size = sizeof(RVDecContext),
.init = rv10_decode_init,
FF_CODEC_DECODE_CB(rv10_decode_frame),
.close = ff_mpv_decode_close,
.p.capabilities = AV_CODEC_CAP_DR1,
.p.max_lowres = 3,
.caps_internal = FF_CODEC_CAP_INIT_CLEANUP,
};
const FFCodec ff_rv20_decoder = {
.p.name = "rv20",
CODEC_LONG_NAME("RealVideo 2.0"),
.p.type = AVMEDIA_TYPE_VIDEO,
.p.id = AV_CODEC_ID_RV20,
.priv_data_size = sizeof(RVDecContext),
.init = rv10_decode_init,
FF_CODEC_DECODE_CB(rv10_decode_frame),
.close = ff_mpv_decode_close,
.p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_DELAY,
.flush = ff_mpeg_flush,
.p.max_lowres = 3,
.caps_internal = FF_CODEC_CAP_INIT_CLEANUP,
};
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