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FFmpeg/libavcodec/h263dec.c
Andreas Rheinhardt dad06a445f avcodec/Makefile: Remove h263 decoder->mpeg4videodec.o dependency 
Also prefer using #if CONFIG_MPEG4_DECODER checks in order not
to rely on DCE.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
2025-10-11 07:51:01 +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 "mpegvideo.h"
#include "mpegvideodata.h"
#include "mpegvideodec.h"
#include "mpegvideo_unquantize.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)
{
H263DecContext *const h = avctx->priv_data;
MPVContext *const s = &h->c;
MPVUnquantDSPContext unquant_dsp_ctx;
int ret;
s->out_format = FMT_H263;
// set defaults
ret = ff_mpv_decode_init(s, avctx);
if (ret < 0)
return ret;
h->decode_mb = ff_h263_decode_mb;
s->low_delay = 1;
s->y_dc_scale_table =
s->c_dc_scale_table = ff_mpeg1_dc_scale_table;
ff_mpv_unquantize_init(&unquant_dsp_ctx,
avctx->flags & AV_CODEC_FLAG_BITEXACT, 0);
// dct_unquantize defaults for H.263;
// they might change on a per-frame basis for MPEG-4;
// dct_unquantize_inter will be unset for MSMPEG4 codecs later.
s->dct_unquantize_intra = unquant_dsp_ctx.dct_unquantize_h263_intra;
s->dct_unquantize_inter = unquant_dsp_ctx.dct_unquantize_h263_inter;
/* select sub codec */
switch (avctx->codec->id) {
case AV_CODEC_ID_H263:
case AV_CODEC_ID_H263P:
avctx->chroma_sample_location = AVCHROMA_LOC_CENTER;
h->decode_header = ff_h263_decode_picture_header;
break;
case AV_CODEC_ID_MPEG4:
break;
case AV_CODEC_ID_MSMPEG4V1:
s->h263_pred = 1;
s->msmpeg4_version = MSMP4_V1;
break;
case AV_CODEC_ID_MSMPEG4V2:
s->h263_pred = 1;
s->msmpeg4_version = MSMP4_V2;
break;
case AV_CODEC_ID_MSMPEG4V3:
s->h263_pred = 1;
s->msmpeg4_version = MSMP4_V3;
break;
case AV_CODEC_ID_WMV1:
s->h263_pred = 1;
s->msmpeg4_version = MSMP4_WMV1;
break;
case AV_CODEC_ID_WMV2:
s->h263_pred = 1;
s->msmpeg4_version = MSMP4_WMV2;
break;
case AV_CODEC_ID_RV10:
case AV_CODEC_ID_RV20:
break;
#if CONFIG_H263I_DECODER
case AV_CODEC_ID_H263I:
h->decode_header = ff_intel_h263_decode_picture_header;
break;
#endif
#if CONFIG_FLV_DECODER
case AV_CODEC_ID_FLV1:
h->decode_header = ff_flv_decode_picture_header;
break;
#endif
default:
av_unreachable("Switch contains a case for every codec using ff_h263_decode_init()");
}
if (avctx->codec_tag == AV_RL32("L263") || avctx->codec_tag == AV_RL32("S263"))
if (avctx->extradata_size == 56 && avctx->extradata[0] == 1)
h->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;
}
static void report_decode_progress(H263DecContext *const h)
{
if (h->c.pict_type != AV_PICTURE_TYPE_B && !h->partitioned_frame && !h->c.er.error_occurred)
ff_thread_progress_report(&h->c.cur_pic.ptr->progress, h->c.mb_y);
}
static int decode_slice(H263DecContext *const h)
{
const int part_mask = h->partitioned_frame
? (ER_AC_END | ER_AC_ERROR) : 0x7F;
const int mb_size = 16 >> h->c.avctx->lowres;
int ret;
h->last_resync_gb = h->gb;
h->c.first_slice_line = 1;
h->c.resync_mb_x = h->c.mb_x;
h->c.resync_mb_y = h->c.mb_y;
ff_set_qscale(&h->c, h->c.qscale);
#if CONFIG_MPEG4_DECODER
if (h->c.studio_profile) {
if ((ret = ff_mpeg4_decode_studio_slice_header(h)) < 0)
return ret;
}
#endif
if (h->c.avctx->hwaccel) {
const uint8_t *start = h->gb.buffer + get_bits_count(&h->gb) / 8;
ret = FF_HW_CALL(h->c.avctx, decode_slice, start,
get_bits_bytesize(&h->gb, 0) - get_bits_count(&h->gb) / 8);
// ensure we exit decode loop
h->c.mb_y = h->c.mb_height;
return ret;
}
#if CONFIG_MPEG4_DECODER
if (h->partitioned_frame) {
const int qscale = h->c.qscale;
av_assert1(h->c.codec_id == AV_CODEC_ID_MPEG4);
ret = ff_mpeg4_decode_partitions(h);
if (ret < 0)
return ret;
/* restore variables which were modified */
h->c.first_slice_line = 1;
h->c.mb_x = h->c.resync_mb_x;
h->c.mb_y = h->c.resync_mb_y;
ff_set_qscale(&h->c, qscale);
}
#endif
for (; h->c.mb_y < h->c.mb_height; h->c.mb_y++) {
/* per-row end of slice checks */
if (h->c.msmpeg4_version != MSMP4_UNUSED) {
if (h->c.resync_mb_y + h->slice_height == h->c.mb_y) {
ff_er_add_slice(&h->c.er, h->c.resync_mb_x, h->c.resync_mb_y,
h->c.mb_x - 1, h->c.mb_y, ER_MB_END);
return 0;
}
}
if (h->c.msmpeg4_version == MSMP4_V1) {
h->c.last_dc[0] =
h->c.last_dc[1] =
h->c.last_dc[2] = 128;
}
ff_init_block_index(&h->c);
for (; h->c.mb_x < h->c.mb_width; h->c.mb_x++) {
int ret;
ff_update_block_index(&h->c, h->c.avctx->bits_per_raw_sample,
h->c.avctx->lowres, h->c.chroma_x_shift);
if (h->c.resync_mb_x == h->c.mb_x && h->c.resync_mb_y + 1 == h->c.mb_y)
h->c.first_slice_line = 0;
/* DCT & quantize */
h->c.mv_dir = MV_DIR_FORWARD;
h->c.mv_type = MV_TYPE_16X16;
ff_dlog(h->c.avctx, "%d %06X\n",
get_bits_count(&h->gb), show_bits(&h->gb, 24));
ff_tlog(NULL, "Decoding MB at %dx%d\n", h->c.mb_x, h->c.mb_y);
ret = h->decode_mb(h);
if (h->c.h263_pred || h->c.h263_aic) {
int mb_xy = h->c.mb_y * h->c.mb_stride + h->c.mb_x;
if (!h->c.mb_intra) {
ff_h263_clean_intra_table_entries(&h->c, mb_xy);
} else
h->c.mbintra_table[mb_xy] = 1;
}
if (h->c.pict_type != AV_PICTURE_TYPE_B)
ff_h263_update_motion_val(&h->c);
if (ret < 0) {
const int xy = h->c.mb_x + h->c.mb_y * h->c.mb_stride;
if (ret == SLICE_END) {
ff_mpv_reconstruct_mb(&h->c, h->block);
if (h->loop_filter)
ff_h263_loop_filter(&h->c);
ff_er_add_slice(&h->c.er, h->c.resync_mb_x, h->c.resync_mb_y,
h->c.mb_x, h->c.mb_y, ER_MB_END & part_mask);
h->padding_bug_score--;
if (++h->c.mb_x >= h->c.mb_width) {
h->c.mb_x = 0;
report_decode_progress(h);
ff_mpeg_draw_horiz_band(&h->c, h->c.mb_y * mb_size, mb_size);
h->c.mb_y++;
}
return 0;
} else if (ret == SLICE_NOEND) {
av_log(h->c.avctx, AV_LOG_ERROR,
"Slice mismatch at MB: %d\n", xy);
ff_er_add_slice(&h->c.er, h->c.resync_mb_x, h->c.resync_mb_y,
h->c.mb_x + 1, h->c.mb_y,
ER_MB_END & part_mask);
return AVERROR_INVALIDDATA;
}
av_log(h->c.avctx, AV_LOG_ERROR, "Error at MB: %d\n", xy);
ff_er_add_slice(&h->c.er, h->c.resync_mb_x, h->c.resync_mb_y,
h->c.mb_x, h->c.mb_y, ER_MB_ERROR & part_mask);
if ((h->c.avctx->err_recognition & AV_EF_IGNORE_ERR) && get_bits_left(&h->gb) > 0)
continue;
return AVERROR_INVALIDDATA;
}
ff_mpv_reconstruct_mb(&h->c, h->block);
if (h->loop_filter)
ff_h263_loop_filter(&h->c);
}
report_decode_progress(h);
ff_mpeg_draw_horiz_band(&h->c, h->c.mb_y * mb_size, mb_size);
h->c.mb_x = 0;
}
av_assert1(h->c.mb_x == 0 && h->c.mb_y == h->c.mb_height);
// Detect incorrect padding with wrong stuffing codes used by NEC N-02B
if (h->c.codec_id == AV_CODEC_ID_MPEG4 &&
(h->c.workaround_bugs & FF_BUG_AUTODETECT) &&
get_bits_left(&h->gb) >= 48 &&
show_bits(&h->gb, 24) == 0x4010 &&
!h->data_partitioning)
h->padding_bug_score += 32;
/* try to detect the padding bug */
if (h->c.codec_id == AV_CODEC_ID_MPEG4 &&
(h->c.workaround_bugs & FF_BUG_AUTODETECT) &&
get_bits_left(&h->gb) >= 0 &&
get_bits_left(&h->gb) < 137 &&
!h->data_partitioning) {
const int bits_count = get_bits_count(&h->gb);
const int bits_left = h->gb.size_in_bits - bits_count;
if (bits_left == 0) {
h->padding_bug_score += 16;
} else if (bits_left != 1) {
int v = show_bits(&h->gb, 8);
v |= 0x7F >> (7 - (bits_count & 7));
if (v == 0x7F && bits_left <= 8)
h->padding_bug_score--;
else if (v == 0x7F && ((get_bits_count(&h->gb) + 8) & 8) &&
bits_left <= 16)
h->padding_bug_score += 4;
else
h->padding_bug_score++;
}
}
if (h->c.codec_id == AV_CODEC_ID_H263 &&
(h->c.workaround_bugs & FF_BUG_AUTODETECT) &&
get_bits_left(&h->gb) >= 8 &&
get_bits_left(&h->gb) < 300 &&
h->c.pict_type == AV_PICTURE_TYPE_I &&
show_bits(&h->gb, 8) == 0 &&
!h->data_partitioning) {
h->padding_bug_score += 32;
}
if (h->c.codec_id == AV_CODEC_ID_H263 &&
(h->c.workaround_bugs & FF_BUG_AUTODETECT) &&
get_bits_left(&h->gb) >= 64 &&
AV_RB64(h->gb.buffer + (get_bits_bytesize(&h->gb, 0) - 8)) == 0xCDCDCDCDFC7F0000) {
h->padding_bug_score += 32;
}
if (h->c.workaround_bugs & FF_BUG_AUTODETECT) {
if (
(h->padding_bug_score > -2 && !h->data_partitioning))
h->c.workaround_bugs |= FF_BUG_NO_PADDING;
else
h->c.workaround_bugs &= ~FF_BUG_NO_PADDING;
}
// handle formats which don't have unique end markers
if (h->c.msmpeg4_version != MSMP4_UNUSED || (h->c.workaround_bugs & FF_BUG_NO_PADDING)) { // FIXME perhaps solve this more cleanly
int left = get_bits_left(&h->gb);
int max_extra = 7;
/* no markers in M$ crap */
if (h->c.msmpeg4_version != MSMP4_UNUSED && h->c.pict_type == AV_PICTURE_TYPE_I)
max_extra += 17;
/* buggy padding but the frame should still end approximately at
* the bitstream end */
if ((h->c.workaround_bugs & FF_BUG_NO_PADDING) &&
(h->c.avctx->err_recognition & (AV_EF_BUFFER|AV_EF_AGGRESSIVE)))
max_extra += 48;
else if ((h->c.workaround_bugs & FF_BUG_NO_PADDING))
max_extra += 256 * 256 * 256 * 64;
if (left > max_extra)
av_log(h->c.avctx, AV_LOG_ERROR,
"discarding %d junk bits at end, next would be %X\n",
left, show_bits(&h->gb, 24));
else if (left < 0)
av_log(h->c.avctx, AV_LOG_ERROR, "overreading %d bits\n", -left);
else
ff_er_add_slice(&h->c.er, h->c.resync_mb_x, h->c.resync_mb_y,
h->c.mb_x - 1, h->c.mb_y, ER_MB_END);
return 0;
}
av_log(h->c.avctx, AV_LOG_ERROR,
"slice end not reached but screenspace end (%d left %06X, score= %d)\n",
get_bits_left(&h->gb), show_bits(&h->gb, 24), h->padding_bug_score);
ff_er_add_slice(&h->c.er, h->c.resync_mb_x, h->c.resync_mb_y, h->c.mb_x, h->c.mb_y,
ER_MB_END & part_mask);
return AVERROR_INVALIDDATA;
}
int ff_h263_decode_frame(AVCodecContext *avctx, AVFrame *pict,
int *got_frame, AVPacket *avpkt)
{
H263DecContext *const h = avctx->priv_data;
MPVContext *const s = &h->c;
const uint8_t *buf = avpkt->data;
int buf_size = avpkt->size;
int ret;
int slice_ret = 0;
int bak_width, bak_height;
/* no supplementary picture */
if (buf_size == 0) {
/* special case for last picture */
if ((!h->c.low_delay || h->skipped_last_frame) && h->c.next_pic.ptr) {
if ((ret = av_frame_ref(pict, h->c.next_pic.ptr->f)) < 0)
return ret;
if (h->skipped_last_frame) {
/* If the stream ended with an NVOP, we output the last frame
* in display order, but with the props from the last input
* packet so that the stream's end time is correct. */
ret = ff_decode_frame_props(avctx, pict);
if (ret < 0)
return ret;
}
ff_mpv_unref_picture(&h->c.next_pic);
*got_frame = 1;
}
return 0;
}
// h->gb might be overridden in ff_mpeg4_decode_picture_header() below.
ret = init_get_bits8(&h->gb, buf, buf_size);
if (ret < 0)
return ret;
bak_width = h->c.width;
bak_height = h->c.height;
/* let's go :-) */
ret = h->decode_header(h);
if (ret < 0 || ret == FRAME_SKIPPED) {
if ( h->c.width != bak_width
|| h->c.height != bak_height) {
av_log(h->c.avctx, AV_LOG_WARNING, "Reverting picture dimensions change due to header decoding failure\n");
h->c.width = bak_width;
h->c.height= bak_height;
}
}
if (ret == FRAME_SKIPPED)
return buf_size;
/* skip if the header was thrashed */
if (ret < 0) {
av_log(h->c.avctx, AV_LOG_ERROR, "header damaged\n");
return ret;
}
if (!h->c.context_initialized) {
avctx->pix_fmt = h263_get_format(avctx);
if ((ret = ff_mpv_common_init(s)) < 0)
return ret;
}
avctx->has_b_frames = !h->c.low_delay;
#if CONFIG_MPEG4_DECODER
if (avctx->codec_id == AV_CODEC_ID_MPEG4) {
if (h->c.pict_type != AV_PICTURE_TYPE_B && h->c.mb_num/2 > get_bits_left(&h->gb))
return AVERROR_INVALIDDATA;
ff_mpeg4_workaround_bugs(avctx);
if (h->c.studio_profile != (h->c.idsp.idct == NULL))
ff_mpv_idct_init(s);
}
#endif
/* After H.263 & MPEG-4 header decode we have the height, width,
* and other parameters. So then we could init the picture. */
if (h->c.width != avctx->coded_width ||
h->c.height != avctx->coded_height ||
h->c.context_reinit) {
/* H.263 could change picture size any time */
h->c.context_reinit = 0;
ret = ff_set_dimensions(avctx, h->c.width, h->c.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;
}
}
/* skip B-frames if we don't have reference frames */
if (!h->c.last_pic.ptr &&
(h->c.pict_type == AV_PICTURE_TYPE_B || h->c.droppable))
return buf_size;
if ((avctx->skip_frame >= AVDISCARD_NONREF &&
h->c.pict_type == AV_PICTURE_TYPE_B) ||
(avctx->skip_frame >= AVDISCARD_NONKEY &&
h->c.pict_type != AV_PICTURE_TYPE_I) ||
avctx->skip_frame >= AVDISCARD_ALL)
return buf_size;
if ((ret = ff_mpv_frame_start(s, avctx)) < 0)
return ret;
if (!h->divx_packed)
ff_thread_finish_setup(avctx);
if (avctx->hwaccel) {
ret = FF_HW_CALL(avctx, start_frame, NULL,
h->gb.buffer, get_bits_bytesize(&h->gb, 0));
if (ret < 0 )
return ret;
}
ff_mpv_er_frame_start_ext(s, h->partitioned_frame,
s->pp_time, s->pb_time);
/* 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
if (h->c.msmpeg4_version == MSMP4_WMV2) {
ret = ff_wmv2_decode_secondary_picture_header(h);
if (ret < 0)
return ret;
if (ret == 1)
goto frame_end;
}
#endif
/* decode each macroblock */
h->c.mb_x = 0;
h->c.mb_y = 0;
slice_ret = decode_slice(h);
while (h->c.mb_y < h->c.mb_height) {
if (h->c.msmpeg4_version != MSMP4_UNUSED) {
if (h->slice_height == 0 || h->c.mb_x != 0 || slice_ret < 0 ||
(h->c.mb_y % h->slice_height) != 0 || get_bits_left(&h->gb) < 0)
break;
} else {
int prev_x = h->c.mb_x, prev_y = h->c.mb_y;
if (ff_h263_resync(h) < 0)
break;
if (prev_y * h->c.mb_width + prev_x < h->c.mb_y * h->c.mb_width + h->c.mb_x)
h->c.er.error_occurred = 1;
}
if (h->c.msmpeg4_version < MSMP4_WMV1 && h->c.h263_pred)
ff_mpeg4_clean_buffers(s);
if (decode_slice(h) < 0)
slice_ret = AVERROR_INVALIDDATA;
}
if (h->c.msmpeg4_version != MSMP4_UNUSED && h->c.msmpeg4_version < MSMP4_WMV1 &&
h->c.pict_type == AV_PICTURE_TYPE_I)
if (!CONFIG_MSMPEG4DEC ||
ff_msmpeg4_decode_ext_header(h, buf_size) < 0)
h->c.er.error_status_table[h->c.mb_num - 1] = ER_MB_ERROR;
frame_end:
if (!h->c.studio_profile)
ff_er_frame_end(&h->c.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
if (avctx->codec_id == AV_CODEC_ID_MPEG4)
ff_mpeg4_frame_end(avctx, avpkt);
#endif
av_assert1(h->c.pict_type == h->c.cur_pic.ptr->f->pict_type);
if (h->c.pict_type == AV_PICTURE_TYPE_B || h->c.low_delay) {
if ((ret = av_frame_ref(pict, h->c.cur_pic.ptr->f)) < 0)
return ret;
ff_print_debug_info(s, h->c.cur_pic.ptr, pict);
ff_mpv_export_qp_table(s, pict, h->c.cur_pic.ptr, FF_MPV_QSCALE_TYPE_MPEG1);
} else if (h->c.last_pic.ptr) {
if ((ret = av_frame_ref(pict, h->c.last_pic.ptr->f)) < 0)
return ret;
ff_print_debug_info(s, h->c.last_pic.ptr, pict);
ff_mpv_export_qp_table(s, pict, h->c.last_pic.ptr, FF_MPV_QSCALE_TYPE_MPEG1);
}
if (h->c.last_pic.ptr || h->c.low_delay) {
if ( pict->format == AV_PIX_FMT_YUV420P
&& (h->c.codec_tag == AV_RL32("GEOV") || h->c.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 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(H263DecContext),
.init = ff_h263_decode_init,
FF_CODEC_DECODE_CB(ff_h263_decode_frame),
.close = ff_mpv_decode_close,
.p.capabilities = AV_CODEC_CAP_DRAW_HORIZ_BAND | AV_CODEC_CAP_DR1 |
AV_CODEC_CAP_DELAY,
.caps_internal = FF_CODEC_CAP_INIT_CLEANUP |
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(H263DecContext),
.init = ff_h263_decode_init,
FF_CODEC_DECODE_CB(ff_h263_decode_frame),
.close = ff_mpv_decode_close,
.p.capabilities = AV_CODEC_CAP_DRAW_HORIZ_BAND | AV_CODEC_CAP_DR1 |
AV_CODEC_CAP_DELAY,
.caps_internal = FF_CODEC_CAP_INIT_CLEANUP |
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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