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->avctx->hwaccel) {
const uint8_t *start = s->gb.buffer + get_bits_count(&s->gb) / 8;
ret = s->avctx->hwaccel->decode_slice(s->avctx, 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);
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 %d %06X\n",
ret, 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_decode_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->err_recognition & AV_EF_IGNORE_ERR)
continue;
return AVERROR_INVALIDDATA;
}
ff_mpv_decode_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);
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++;
}
}
static void h264_initialise_ref_list(H264Context *h, H264SliceContext *sl)
{
int i, len;
int j;
if (sl->slice_type_nos == AV_PICTURE_TYPE_B) {
H264Picture *sorted[32];
int cur_poc, list;
int lens[2];
if (FIELD_PICTURE(h))
cur_poc = h->cur_pic_ptr->field_poc[h->picture_structure == PICT_BOTTOM_FIELD];
else
cur_poc = h->cur_pic_ptr->poc;
for (list = 0; list < 2; list++) {
len = add_sorted(sorted, h->short_ref, h->short_ref_count, cur_poc, 1 ^ list);
len += add_sorted(sorted + len, h->short_ref, h->short_ref_count, cur_poc, 0 ^ list);
av_assert0(len <= 32);
len = build_def_list(sl->ref_list[list], FF_ARRAY_ELEMS(sl->ref_list[0]),
sorted, len, 0, h->picture_structure);
len += build_def_list(sl->ref_list[list] + len,
FF_ARRAY_ELEMS(sl->ref_list[0]) - len,
h->long_ref, 16, 1, h->picture_structure);
av_assert0(len <= 32);
if (len < sl->ref_count[list])
memset(&sl->ref_list[list][len], 0, sizeof(H264Ref) * (sl->ref_count[list] - len));
lens[list] = len;
}
if (lens[0] == lens[1] && lens[1] > 1) {
for (i = 0; i < lens[0] &&
sl->ref_list[0][i].parent->f->buf[0]->buffer ==
sl->ref_list[1][i].parent->f->buf[0]->buffer; i++);
if (i == lens[0]) {
FFSWAP(H264Ref, sl->ref_list[1][0], sl->ref_list[1][1]);
}
}
} else {
len = build_def_list(sl->ref_list[0], FF_ARRAY_ELEMS(sl->ref_list[0]),
h->short_ref, h->short_ref_count, 0, h->picture_structure);
len += build_def_list(sl->ref_list[0] + len,
FF_ARRAY_ELEMS(sl->ref_list[0]) - len,
h-> long_ref, 16, 1, h->picture_structure);
av_assert0(len <= 32);
if (len < sl->ref_count[0])
memset(&sl->ref_list[0][len], 0, sizeof(H264Ref) * (sl->ref_count[0] - len));
}
#ifdef TRACE
for (i = 0; i < sl->ref_count[0]; i++) {
ff_tlog(h->avctx, "List0: %s fn:%d 0x%p\n",
(sl->ref_list[0][i].parent ? (sl->ref_list[0][i].parent->long_ref ? "LT" : "ST") : "??"),
sl->ref_list[0][i].pic_id,
sl->ref_list[0][i].data[0]);
}
if (sl->slice_type_nos == AV_PICTURE_TYPE_B) {
for (i = 0; i < sl->ref_count[1]; i++) {
ff_tlog(h->avctx, "List1: %s fn:%d 0x%p\n",
(sl->ref_list[1][i].parent ? (sl->ref_list[1][i].parent->long_ref ? "LT" : "ST") : "??"),
sl->ref_list[1][i].pic_id,
sl->ref_list[1][i].data[0]);
}
}
#endif
for (j = 0; j<1+(sl->slice_type_nos == AV_PICTURE_TYPE_B); j++) {
for (i = 0; i < sl->ref_count[j]; i++) {
if (sl->ref_list[j][i].parent) {
if (mismatches_ref(h, sl->ref_list[j][i].parent)) {
av_log(h->avctx, AV_LOG_ERROR, "Discarding mismatching reference\n");
memset(&sl->ref_list[j][i], 0, sizeof(sl->ref_list[j][i]));
}
}
}
}
for (i = 0; i < sl->list_count; i++)
h->default_ref[i] = sl->ref_list[i][0];
}
