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ffmpeg/libavcodec/h263dec.c
Andreas Rheinhardt 66923165d5 avcodec/mpegutils: Move definitions to better places 
FRAME_SKIPPED -> h263dec.h
CANDIDATE_MB_TYPE_* -> mpegvideoenc.h
INPLACE_OFFSET -> mpegvideoenc.h
enum OutputFormat -> mpegvideo.h

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
2024-04-08 15:00:01 +02:00

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/*
* H.263 decoder
* Copyright (c) 2001 Fabrice Bellard
* Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>
*
* 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
* H.263 decoder.
*/
#define UNCHECKED_BITSTREAM_READER 1
#include "config_components.h"
#include "avcodec.h"
#include "codec_internal.h"
#include "decode.h"
#include "error_resilience.h"
#include "flvdec.h"
#include "h263.h"
#include "h263dec.h"
#include "hwaccel_internal.h"
#include "hwconfig.h"
#include "mpeg_er.h"
#include "mpeg4video.h"
#include "mpeg4videodec.h"
#include "mpeg4videodefs.h"
#include "mpegvideo.h"
#include "mpegvideodec.h"
#include "msmpeg4dec.h"
#include "thread.h"
#include "wmv2dec.h"
static const enum AVPixelFormat h263_hwaccel_pixfmt_list_420[] = {
#if CONFIG_H263_VAAPI_HWACCEL || CONFIG_MPEG4_VAAPI_HWACCEL
AV_PIX_FMT_VAAPI,
#endif
#if CONFIG_MPEG4_NVDEC_HWACCEL
AV_PIX_FMT_CUDA,
#endif
#if CONFIG_MPEG4_VDPAU_HWACCEL
AV_PIX_FMT_VDPAU,
#endif
#if CONFIG_H263_VIDEOTOOLBOX_HWACCEL || CONFIG_MPEG4_VIDEOTOOLBOX_HWACCEL
AV_PIX_FMT_VIDEOTOOLBOX,
#endif
AV_PIX_FMT_YUV420P,
AV_PIX_FMT_NONE
};
static enum AVPixelFormat h263_get_format(AVCodecContext *avctx)
{
/* MPEG-4 Studio Profile only, not supported by hardware */
if (avctx->bits_per_raw_sample > 8) {
av_assert1(((MpegEncContext *)avctx->priv_data)->studio_profile);
return avctx->pix_fmt;
}
if (CONFIG_GRAY && (avctx->flags & AV_CODEC_FLAG_GRAY)) {
if (avctx->color_range == AVCOL_RANGE_UNSPECIFIED)
avctx->color_range = AVCOL_RANGE_MPEG;
return AV_PIX_FMT_GRAY8;
}
if (avctx->codec_id == AV_CODEC_ID_H263 ||
avctx->codec_id == AV_CODEC_ID_H263P ||
avctx->codec_id == AV_CODEC_ID_MPEG4)
return avctx->pix_fmt = ff_get_format(avctx, h263_hwaccel_pixfmt_list_420);
return AV_PIX_FMT_YUV420P;
}
av_cold int ff_h263_decode_init(AVCodecContext *avctx)
{
MpegEncContext *s = avctx->priv_data;
int ret;
s->out_format = FMT_H263;
// set defaults
ff_mpv_decode_init(s, avctx);
s->quant_precision = 5;
s->decode_mb = ff_h263_decode_mb;
s->low_delay = 1;
/* select sub codec */
switch (avctx->codec->id) {
case AV_CODEC_ID_H263:
case AV_CODEC_ID_H263P:
avctx->chroma_sample_location = AVCHROMA_LOC_CENTER;
break;
case AV_CODEC_ID_MPEG4:
break;
case AV_CODEC_ID_MSMPEG4V1:
s->h263_pred = 1;
s->msmpeg4_version = 1;
break;
case AV_CODEC_ID_MSMPEG4V2:
s->h263_pred = 1;
s->msmpeg4_version = 2;
break;
case AV_CODEC_ID_MSMPEG4V3:
s->h263_pred = 1;
s->msmpeg4_version = 3;
break;
case AV_CODEC_ID_WMV1:
s->h263_pred = 1;
s->msmpeg4_version = 4;
break;
case AV_CODEC_ID_WMV2:
s->h263_pred = 1;
s->msmpeg4_version = 5;
break;
case AV_CODEC_ID_H263I:
break;
case AV_CODEC_ID_FLV1:
s->h263_flv = 1;
break;
default:
av_log(avctx, AV_LOG_ERROR, "Unsupported codec %d\n",
avctx->codec->id);
return AVERROR(ENOSYS);
}
if (avctx->codec_tag == AV_RL32("L263") || avctx->codec_tag == AV_RL32("S263"))
if (avctx->extradata_size == 56 && avctx->extradata[0] == 1)
s->ehc_mode = 1;
/* for H.263, we allocate the images after having read the header */
if (avctx->codec->id != AV_CODEC_ID_H263 &&
avctx->codec->id != AV_CODEC_ID_H263P &&
avctx->codec->id != AV_CODEC_ID_MPEG4) {
avctx->pix_fmt = h263_get_format(avctx);
if ((ret = ff_mpv_common_init(s)) < 0)
return ret;
}
ff_h263dsp_init(&s->h263dsp);
ff_h263_decode_init_vlc();
return 0;
}
av_cold int ff_h263_decode_end(AVCodecContext *avctx)
{
MpegEncContext *s = avctx->priv_data;
ff_mpv_common_end(s);
return 0;
}
/**
* Return the number of bytes consumed for building the current frame.
*/
static int get_consumed_bytes(MpegEncContext *s, int buf_size)
{
int pos = (get_bits_count(&s->gb) + 7) >> 3;
if (s->divx_packed || s->avctx->hwaccel) {
/* We would have to scan through the whole buf to handle the weird
* reordering ... */
return buf_size;
} else {
// avoid infinite loops (maybe not needed...)
if (pos == 0)
pos = 1;
// oops ;)
if (pos + 10 > buf_size)
pos = buf_size;
return pos;
}
}
static int decode_slice(MpegEncContext *s)
{
const int part_mask = s->partitioned_frame
? (ER_AC_END | ER_AC_ERROR) : 0x7F;
const int mb_size = 16 >> s->avctx->lowres;
int ret;
s->last_resync_gb = s->gb;
s->first_slice_line = 1;
s->resync_mb_x = s->mb_x;
s->resync_mb_y = s->mb_y;
ff_set_qscale(s, s->qscale);
if (s->studio_profile) {
if ((ret = ff_mpeg4_decode_studio_slice_header(s->avctx->priv_data)) < 0)
return ret;
}
if (s->avctx->hwaccel) {
const uint8_t *start = s->gb.buffer + get_bits_count(&s->gb) / 8;
ret = FF_HW_CALL(s->avctx, decode_slice, start, s->gb.buffer_end - start);
// ensure we exit decode loop
s->mb_y = s->mb_height;
return ret;
}
if (s->partitioned_frame) {
const int qscale = s->qscale;
if (CONFIG_MPEG4_DECODER && s->codec_id == AV_CODEC_ID_MPEG4)
if ((ret = ff_mpeg4_decode_partitions(s->avctx->priv_data)) < 0)
return ret;
/* restore variables which were modified */
s->first_slice_line = 1;
s->mb_x = s->resync_mb_x;
s->mb_y = s->resync_mb_y;
ff_set_qscale(s, qscale);
}
for (; s->mb_y < s->mb_height; s->mb_y++) {
/* per-row end of slice checks */
if (s->msmpeg4_version) {
if (s->resync_mb_y + s->slice_height == s->mb_y) {
ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
s->mb_x - 1, s->mb_y, ER_MB_END);
return 0;
}
}
if (s->msmpeg4_version == 1) {
s->last_dc[0] =
s->last_dc[1] =
s->last_dc[2] = 128;
}
ff_init_block_index(s);
for (; s->mb_x < s->mb_width; s->mb_x++) {
int ret;
ff_update_block_index(s, s->avctx->bits_per_raw_sample,
s->avctx->lowres, s->chroma_x_shift);
if (s->resync_mb_x == s->mb_x && s->resync_mb_y + 1 == s->mb_y)
s->first_slice_line = 0;
/* DCT & quantize */
s->mv_dir = MV_DIR_FORWARD;
s->mv_type = MV_TYPE_16X16;
ff_dlog(s, "%d %06X\n",
get_bits_count(&s->gb), show_bits(&s->gb, 24));
ff_tlog(NULL, "Decoding MB at %dx%d\n", s->mb_x, s->mb_y);
ret = s->decode_mb(s, s->block);
if (s->pict_type != AV_PICTURE_TYPE_B)
ff_h263_update_motion_val(s);
if (ret < 0) {
const int xy = s->mb_x + s->mb_y * s->mb_stride;
if (ret == SLICE_END) {
ff_mpv_reconstruct_mb(s, s->block);
if (s->loop_filter)
ff_h263_loop_filter(s);
ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
s->mb_x, s->mb_y, ER_MB_END & part_mask);
s->padding_bug_score--;
if (++s->mb_x >= s->mb_width) {
s->mb_x = 0;
ff_mpeg_draw_horiz_band(s, s->mb_y * mb_size, mb_size);
ff_mpv_report_decode_progress(s);
s->mb_y++;
}
return 0;
} else if (ret == SLICE_NOEND) {
av_log(s->avctx, AV_LOG_ERROR,
"Slice mismatch at MB: %d\n", xy);
ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
s->mb_x + 1, s->mb_y,
ER_MB_END & part_mask);
return AVERROR_INVALIDDATA;
}
av_log(s->avctx, AV_LOG_ERROR, "Error at MB: %d\n", xy);
ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
s->mb_x, s->mb_y, ER_MB_ERROR & part_mask);
if ((s->avctx->err_recognition & AV_EF_IGNORE_ERR) && get_bits_left(&s->gb) > 0)
continue;
return AVERROR_INVALIDDATA;
}
ff_mpv_reconstruct_mb(s, s->block);
if (s->loop_filter)
ff_h263_loop_filter(s);
}
ff_mpeg_draw_horiz_band(s, s->mb_y * mb_size, mb_size);
ff_mpv_report_decode_progress(s);
s->mb_x = 0;
}
av_assert1(s->mb_x == 0 && s->mb_y == s->mb_height);
// Detect incorrect padding with wrong stuffing codes used by NEC N-02B
if (s->codec_id == AV_CODEC_ID_MPEG4 &&
(s->workaround_bugs & FF_BUG_AUTODETECT) &&
get_bits_left(&s->gb) >= 48 &&
show_bits(&s->gb, 24) == 0x4010 &&
!s->data_partitioning)
s->padding_bug_score += 32;
/* try to detect the padding bug */
if (s->codec_id == AV_CODEC_ID_MPEG4 &&
(s->workaround_bugs & FF_BUG_AUTODETECT) &&
get_bits_left(&s->gb) >= 0 &&
get_bits_left(&s->gb) < 137 &&
!s->data_partitioning) {
const int bits_count = get_bits_count(&s->gb);
const int bits_left = s->gb.size_in_bits - bits_count;
if (bits_left == 0) {
s->padding_bug_score += 16;
} else if (bits_left != 1) {
int v = show_bits(&s->gb, 8);
v |= 0x7F >> (7 - (bits_count & 7));
if (v == 0x7F && bits_left <= 8)
s->padding_bug_score--;
else if (v == 0x7F && ((get_bits_count(&s->gb) + 8) & 8) &&
bits_left <= 16)
s->padding_bug_score += 4;
else
s->padding_bug_score++;
}
}
if (s->codec_id == AV_CODEC_ID_H263 &&
(s->workaround_bugs & FF_BUG_AUTODETECT) &&
get_bits_left(&s->gb) >= 8 &&
get_bits_left(&s->gb) < 300 &&
s->pict_type == AV_PICTURE_TYPE_I &&
show_bits(&s->gb, 8) == 0 &&
!s->data_partitioning) {
s->padding_bug_score += 32;
}
if (s->codec_id == AV_CODEC_ID_H263 &&
(s->workaround_bugs & FF_BUG_AUTODETECT) &&
get_bits_left(&s->gb) >= 64 &&
AV_RB64(s->gb.buffer_end - 8) == 0xCDCDCDCDFC7F0000) {
s->padding_bug_score += 32;
}
if (s->workaround_bugs & FF_BUG_AUTODETECT) {
if (
(s->padding_bug_score > -2 && !s->data_partitioning))
s->workaround_bugs |= FF_BUG_NO_PADDING;
else
s->workaround_bugs &= ~FF_BUG_NO_PADDING;
}
// handle formats which don't have unique end markers
if (s->msmpeg4_version || (s->workaround_bugs & FF_BUG_NO_PADDING)) { // FIXME perhaps solve this more cleanly
int left = get_bits_left(&s->gb);
int max_extra = 7;
/* no markers in M$ crap */
if (s->msmpeg4_version && s->pict_type == AV_PICTURE_TYPE_I)
max_extra += 17;
/* buggy padding but the frame should still end approximately at
* the bitstream end */
if ((s->workaround_bugs & FF_BUG_NO_PADDING) &&
(s->avctx->err_recognition & (AV_EF_BUFFER|AV_EF_AGGRESSIVE)))
max_extra += 48;
else if ((s->workaround_bugs & FF_BUG_NO_PADDING))
max_extra += 256 * 256 * 256 * 64;
if (left > max_extra)
av_log(s->avctx, AV_LOG_ERROR,
"discarding %d junk bits at end, next would be %X\n",
left, show_bits(&s->gb, 24));
else if (left < 0)
av_log(s->avctx, AV_LOG_ERROR, "overreading %d bits\n", -left);
else
ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
s->mb_x - 1, s->mb_y, ER_MB_END);
return 0;
}
av_log(s->avctx, AV_LOG_ERROR,
"slice end not reached but screenspace end (%d left %06X, score= %d)\n",
get_bits_left(&s->gb), show_bits(&s->gb, 24), s->padding_bug_score);
ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y,
ER_MB_END & part_mask);
return AVERROR_INVALIDDATA;
}
int ff_h263_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 ret;
int slice_ret = 0;
/* no supplementary picture */
if (buf_size == 0) {
/* special case for last picture */
if (s->low_delay == 0 && s->next_picture_ptr) {
if ((ret = av_frame_ref(pict, s->next_picture_ptr->f)) < 0)
return ret;
s->next_picture_ptr = NULL;
*got_frame = 1;
} else if (s->skipped_last_frame && s->current_picture_ptr) {
/* Output the last picture we decoded again if the stream ended with
* an NVOP */
if ((ret = av_frame_ref(pict, s->current_picture_ptr->f)) < 0)
return ret;
/* Copy props from the last input packet. Otherwise, props from the last
* returned picture would be reused */
if ((ret = ff_decode_frame_props(avctx, pict)) < 0)
return ret;
s->current_picture_ptr = NULL;
*got_frame = 1;
}
return 0;
}
retry:
if (s->divx_packed && s->bitstream_buffer_size) {
int i;
for(i=0; i < buf_size-3; i++) {
if (buf[i]==0 && buf[i+1]==0 && buf[i+2]==1) {
if (buf[i+3]==0xB0) {
av_log(s->avctx, AV_LOG_WARNING, "Discarding excessive bitstream in packed xvid\n");
s->bitstream_buffer_size = 0;
}
break;
}
}
}
if (s->bitstream_buffer_size && (s->divx_packed || buf_size <= MAX_NVOP_SIZE)) // divx 5.01+/xvid frame reorder
ret = init_get_bits8(&s->gb, s->bitstream_buffer,
s->bitstream_buffer_size);
else
ret = init_get_bits8(&s->gb, buf, buf_size);
s->bitstream_buffer_size = 0;
if (ret < 0)
return ret;
/* let's go :-) */
if (CONFIG_WMV2_DECODER && s->msmpeg4_version == 5) {
ret = ff_wmv2_decode_picture_header(s);
} else if (CONFIG_MSMPEG4DEC && s->msmpeg4_version) {
ret = ff_msmpeg4_decode_picture_header(s);
} else if (CONFIG_MPEG4_DECODER && avctx->codec_id == AV_CODEC_ID_MPEG4) {
ret = ff_mpeg4_decode_picture_header(avctx->priv_data, &s->gb, 0, 0);
s->skipped_last_frame = (ret == FRAME_SKIPPED);
} else if (CONFIG_H263I_DECODER && s->codec_id == AV_CODEC_ID_H263I) {
ret = ff_intel_h263_decode_picture_header(s);
} else if (CONFIG_FLV_DECODER && s->h263_flv) {
ret = ff_flv_decode_picture_header(s);
} else {
ret = ff_h263_decode_picture_header(s);
}
if (ret < 0 || ret == FRAME_SKIPPED) {
if ( s->width != avctx->coded_width
|| s->height != avctx->coded_height) {
av_log(s->avctx, AV_LOG_WARNING, "Reverting picture dimensions change due to header decoding failure\n");
s->width = avctx->coded_width;
s->height= avctx->coded_height;
}
}
if (ret == FRAME_SKIPPED)
return get_consumed_bytes(s, buf_size);
/* skip if the header was thrashed */
if (ret < 0) {
av_log(s->avctx, AV_LOG_ERROR, "header damaged\n");
return ret;
}
if (!s->context_initialized) {
avctx->pix_fmt = h263_get_format(avctx);
if ((ret = ff_mpv_common_init(s)) < 0)
return ret;
}
avctx->has_b_frames = !s->low_delay;
if (CONFIG_MPEG4_DECODER && avctx->codec_id == AV_CODEC_ID_MPEG4) {
if (s->pict_type != AV_PICTURE_TYPE_B && s->mb_num/2 > get_bits_left(&s->gb))
return AVERROR_INVALIDDATA;
if (ff_mpeg4_workaround_bugs(avctx) == 1)
goto retry;
if (s->studio_profile != (s->idsp.idct == NULL))
ff_mpv_idct_init(s);
}
/* After H.263 & MPEG-4 header decode we have the height, width,
* and other parameters. So then we could init the picture.
* FIXME: By the way H.263 decoder is evolving it should have
* an H263EncContext */
if (s->width != avctx->coded_width ||
s->height != avctx->coded_height ||
s->context_reinit) {
/* H.263 could change picture size any time */
s->context_reinit = 0;
ret = ff_set_dimensions(avctx, s->width, s->height);
if (ret < 0)
return ret;
ff_set_sar(avctx, avctx->sample_aspect_ratio);
if ((ret = ff_mpv_common_frame_size_change(s)))
return ret;
if (avctx->pix_fmt != h263_get_format(avctx)) {
av_log(avctx, AV_LOG_ERROR, "format change not supported\n");
avctx->pix_fmt = AV_PIX_FMT_NONE;
return AVERROR_UNKNOWN;
}
}
if (s->codec_id == AV_CODEC_ID_H263 ||
s->codec_id == AV_CODEC_ID_H263P ||
s->codec_id == AV_CODEC_ID_H263I)
s->gob_index = H263_GOB_HEIGHT(s->height);
/* skip B-frames if we don't have reference frames */
if (!s->last_picture_ptr &&
(s->pict_type == AV_PICTURE_TYPE_B || s->droppable))
return get_consumed_bytes(s, buf_size);
if ((avctx->skip_frame >= AVDISCARD_NONREF &&
s->pict_type == AV_PICTURE_TYPE_B) ||
(avctx->skip_frame >= AVDISCARD_NONKEY &&
s->pict_type != AV_PICTURE_TYPE_I) ||
avctx->skip_frame >= AVDISCARD_ALL)
return get_consumed_bytes(s, buf_size);
if ((ret = ff_mpv_frame_start(s, avctx)) < 0)
return ret;
if (!s->divx_packed && !avctx->hwaccel)
ff_thread_finish_setup(avctx);
if (avctx->hwaccel) {
ret = FF_HW_CALL(avctx, start_frame,
s->gb.buffer, s->gb.buffer_end - s->gb.buffer);
if (ret < 0 )
return ret;
}
ff_mpeg_er_frame_start(s);
/* the second part of the wmv2 header contains the MB skip bits which
* are stored in current_picture->mb_type which is not available before
* ff_mpv_frame_start() */
if (CONFIG_WMV2_DECODER && s->msmpeg4_version == 5) {
ret = ff_wmv2_decode_secondary_picture_header(s);
if (ret < 0)
return ret;
if (ret == 1)
goto frame_end;
}
/* decode each macroblock */
s->mb_x = 0;
s->mb_y = 0;
slice_ret = decode_slice(s);
while (s->mb_y < s->mb_height) {
if (s->msmpeg4_version) {
if (s->slice_height == 0 || s->mb_x != 0 || slice_ret < 0 ||
(s->mb_y % s->slice_height) != 0 || get_bits_left(&s->gb) < 0)
break;
} else {
int prev_x = s->mb_x, prev_y = s->mb_y;
if (ff_h263_resync(s) < 0)
break;
if (prev_y * s->mb_width + prev_x < s->mb_y * s->mb_width + s->mb_x)
s->er.error_occurred = 1;
}
if (s->msmpeg4_version < 4 && s->h263_pred)
ff_mpeg4_clean_buffers(s);
if (decode_slice(s) < 0)
slice_ret = AVERROR_INVALIDDATA;
}
if (s->msmpeg4_version && s->msmpeg4_version < 4 &&
s->pict_type == AV_PICTURE_TYPE_I)
if (!CONFIG_MSMPEG4DEC ||
ff_msmpeg4_decode_ext_header(s, buf_size) < 0)
s->er.error_status_table[s->mb_num - 1] = ER_MB_ERROR;
av_assert1(s->bitstream_buffer_size == 0);
frame_end:
if (!s->studio_profile)
ff_er_frame_end(&s->er, NULL);
if (avctx->hwaccel) {
ret = FF_HW_SIMPLE_CALL(avctx, end_frame);
if (ret < 0)
return ret;
}
ff_mpv_frame_end(s);
if (CONFIG_MPEG4_DECODER && avctx->codec_id == AV_CODEC_ID_MPEG4)
ff_mpeg4_frame_end(avctx, buf, buf_size);
if (!s->divx_packed && avctx->hwaccel)
ff_thread_finish_setup(avctx);
av_assert1(s->current_picture.f->pict_type == s->current_picture_ptr->f->pict_type);
av_assert1(s->current_picture.f->pict_type == s->pict_type);
if (s->pict_type == AV_PICTURE_TYPE_B || s->low_delay) {
if ((ret = av_frame_ref(pict, s->current_picture_ptr->f)) < 0)
return ret;
ff_print_debug_info(s, s->current_picture_ptr, pict);
ff_mpv_export_qp_table(s, pict, s->current_picture_ptr, FF_MPV_QSCALE_TYPE_MPEG1);
} else if (s->last_picture_ptr) {
if ((ret = av_frame_ref(pict, s->last_picture_ptr->f)) < 0)
return ret;
ff_print_debug_info(s, s->last_picture_ptr, pict);
ff_mpv_export_qp_table(s, pict, s->last_picture_ptr, FF_MPV_QSCALE_TYPE_MPEG1);
}
if (s->last_picture_ptr || s->low_delay) {
if ( pict->format == AV_PIX_FMT_YUV420P
&& (s->codec_tag == AV_RL32("GEOV") || s->codec_tag == AV_RL32("GEOX"))) {
for (int p = 0; p < 3; p++) {
int h = AV_CEIL_RSHIFT(pict->height, !!p);
pict->data[p] += (h - 1) * pict->linesize[p];
pict->linesize[p] *= -1;
}
}
*got_frame = 1;
}
if (slice_ret < 0 && (avctx->err_recognition & AV_EF_EXPLODE))
return slice_ret;
else
return get_consumed_bytes(s, buf_size);
}
static const AVCodecHWConfigInternal *const h263_hw_config_list[] = {
#if CONFIG_H263_VAAPI_HWACCEL
HWACCEL_VAAPI(h263),
#endif
#if CONFIG_MPEG4_NVDEC_HWACCEL
HWACCEL_NVDEC(mpeg4),
#endif
#if CONFIG_MPEG4_VDPAU_HWACCEL
HWACCEL_VDPAU(mpeg4),
#endif
#if CONFIG_H263_VIDEOTOOLBOX_HWACCEL
HWACCEL_VIDEOTOOLBOX(h263),
#endif
NULL
};
const FFCodec ff_h263_decoder = {
.p.name = "h263",
CODEC_LONG_NAME("H.263 / H.263-1996, H.263+ / H.263-1998 / H.263 version 2"),
.p.type = AVMEDIA_TYPE_VIDEO,
.p.id = AV_CODEC_ID_H263,
.priv_data_size = sizeof(MpegEncContext),
.init = ff_h263_decode_init,
.close = ff_h263_decode_end,
FF_CODEC_DECODE_CB(ff_h263_decode_frame),
.p.capabilities = AV_CODEC_CAP_DRAW_HORIZ_BAND | AV_CODEC_CAP_DR1 |
AV_CODEC_CAP_DELAY,
.caps_internal = FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM,
.flush = ff_mpeg_flush,
.p.max_lowres = 3,
.hw_configs = h263_hw_config_list,
};
const FFCodec ff_h263p_decoder = {
.p.name = "h263p",
CODEC_LONG_NAME("H.263 / H.263-1996, H.263+ / H.263-1998 / H.263 version 2"),
.p.type = AVMEDIA_TYPE_VIDEO,
.p.id = AV_CODEC_ID_H263P,
.priv_data_size = sizeof(MpegEncContext),
.init = ff_h263_decode_init,
.close = ff_h263_decode_end,
FF_CODEC_DECODE_CB(ff_h263_decode_frame),
.p.capabilities = AV_CODEC_CAP_DRAW_HORIZ_BAND | AV_CODEC_CAP_DR1 |
AV_CODEC_CAP_DELAY,
.caps_internal = FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM,
.flush = ff_mpeg_flush,
.p.max_lowres = 3,
.hw_configs = h263_hw_config_list,
};
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