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FFmpeg/libavcodec/rv10.c
Andreas Rheinhardt 9ce56f91c0 avcodec/mpegpicture: Make MPVPicture refcounted 
Up until now, an initialized MpegEncContext had an array of
MPVPictures (way more than were ever needed) and the MPVPicture*
contained in the MPVWorkPictures as well as the input_picture
and reordered_input_picture arrays (for the encoder) pointed
into this array. Several of the pointers could point to the
same slot and because there was no reference counting involved,
one had to check for aliasing before unreferencing.
Furthermore, given that these pointers were not ownership pointers
the pointers were often simply reset without unreferencing
the slot (happened e.g. for the RV30 and RV40 decoders) or
there were moved without resetting the src pointer (happened
for the encoders where the entries in the input_picture
and reordered_input_picture arrays were not reset).
Instead actually releasing these pictures was performed by looping
over the whole array and checking which one of the entries needed
to be kept. Given that the array had way too many slots (36),
this meant that more than 30 MPVPictures have been unnecessarily
unreferenced in every ff_mpv_frame_start(); something similar
happened for the encoder.

This commit changes this by making the MPVPictures refcounted
via the RefStruct API. The MPVPictures itself are part of a pool
so that this does not entail constant allocations; instead,
the amount of allocations actually goes down, because the
earlier code used such a large array of MPVPictures (36 entries) and
allocated an AVFrame for every one of these on every
ff_mpv_common_init(). In fact, the pool is only freed when closing
the codec, so that reinitializations don't lead to new allocations
(this avoids having to sync the pool in update_thread_context).

Making MPVPictures refcounted also has another key benefit:
It makes it possible to directly share them across threads
(when using frame-threaded decoding), eliminating ugly code
with underlying av_frame_ref()'s; sharing these pictures
can't fail any more.

The pool is allocated in ff_mpv_decode_init() for decoders,
which therefore can fail now. This and the fact that the pool
is not unreferenced in ff_mpv_common_end() also necessitated
to mark several mpegvideo-decoders with the FF_CODEC_CAP_INIT_CLEANUP
flag.

*: This also means that there is no good reason any more for
ff_mpv_common_frame_size_change() to exist.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
2024-06-12 11:47:49 +02:00

684 lines
22 KiB
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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;
}
ff_h263_decode_init_vlc();
}
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_mpv_decode_init(s, avctx);
if (ret < 0)
return ret;
s->out_format = FMT_H263;
rv->orig_width =
s->width = avctx->coded_width;
rv->orig_height =
s->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);
s->low_delay = 1;
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;
s->avctx->has_b_frames = 1;
}
break;
default:
av_log(s->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]);
}
avctx->pix_fmt = AV_PIX_FMT_YUV420P;
if ((ret = ff_mpv_common_init(s)) < 0)
return ret;
ff_h263dsp_init(&s->h263dsp);
/* 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;
s->block_wrap[0] =
s->block_wrap[1] =
s->block_wrap[2] =
s->block_wrap[3] = s->b8_stride;
s->block_wrap[4] =
s->block_wrap[5] = s->mb_stride;
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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