diff options
Diffstat (limited to 'ffmpeg1/libavcodec/h264_refs.c')
| -rw-r--r-- | ffmpeg1/libavcodec/h264_refs.c | 813 |
1 files changed, 813 insertions, 0 deletions
diff --git a/ffmpeg1/libavcodec/h264_refs.c b/ffmpeg1/libavcodec/h264_refs.c new file mode 100644 index 0000000..c3e7b7c --- /dev/null +++ b/ffmpeg1/libavcodec/h264_refs.c @@ -0,0 +1,813 @@ +/* + * H.26L/H.264/AVC/JVT/14496-10/... reference picture handling + * Copyright (c) 2003 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.264 / AVC / MPEG4 part10 reference picture handling. + * @author Michael Niedermayer <michaelni@gmx.at> + */ + +#include "libavutil/avassert.h" +#include "internal.h" +#include "avcodec.h" +#include "h264.h" +#include "golomb.h" + +//#undef NDEBUG +#include <assert.h> + +#define COPY_PICTURE(dst, src) \ +do {\ + *(dst) = *(src);\ + (dst)->f.extended_data = (dst)->f.data;\ + (dst)->tf.f = &(dst)->f;\ +} while (0) + + +static void pic_as_field(Picture *pic, const int parity){ + int i; + for (i = 0; i < 4; ++i) { + if (parity == PICT_BOTTOM_FIELD) + pic->f.data[i] += pic->f.linesize[i]; + pic->reference = parity; + pic->f.linesize[i] *= 2; + } + pic->poc= pic->field_poc[parity == PICT_BOTTOM_FIELD]; +} + +static int split_field_copy(Picture *dest, Picture *src, int parity, int id_add) +{ + int match = !!(src->reference & parity); + + if (match) { + COPY_PICTURE(dest, src); + if (parity != PICT_FRAME) { + pic_as_field(dest, parity); + dest->pic_id *= 2; + dest->pic_id += id_add; + } + } + + return match; +} + +static int build_def_list(Picture *def, Picture **in, int len, int is_long, int sel) +{ + int i[2] = { 0 }; + int index = 0; + + while (i[0] < len || i[1] < len) { + while (i[0] < len && !(in[i[0]] && (in[i[0]]->reference & sel))) + i[0]++; + while (i[1] < len && !(in[i[1]] && (in[i[1]]->reference & (sel ^ 3)))) + i[1]++; + if (i[0] < len) { + in[i[0]]->pic_id = is_long ? i[0] : in[i[0]]->frame_num; + split_field_copy(&def[index++], in[i[0]++], sel, 1); + } + if (i[1] < len) { + in[i[1]]->pic_id = is_long ? i[1] : in[i[1]]->frame_num; + split_field_copy(&def[index++], in[i[1]++], sel ^ 3, 0); + } + } + + return index; +} + +static int add_sorted(Picture **sorted, Picture **src, int len, int limit, int dir) +{ + int i, best_poc; + int out_i = 0; + + for (;;) { + best_poc = dir ? INT_MIN : INT_MAX; + + for (i = 0; i < len; i++) { + const int poc = src[i]->poc; + if (((poc > limit) ^ dir) && ((poc < best_poc) ^ dir)) { + best_poc = poc; + sorted[out_i] = src[i]; + } + } + if (best_poc == (dir ? INT_MIN : INT_MAX)) + break; + limit = sorted[out_i++]->poc - dir; + } + return out_i; +} + +int ff_h264_fill_default_ref_list(H264Context *h) +{ + int i, len; + + if (h->slice_type_nos == AV_PICTURE_TYPE_B) { + Picture *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(h->default_ref_list[list], sorted, len, 0, h->picture_structure); + len += build_def_list(h->default_ref_list[list] + len, h->long_ref, 16, 1, h->picture_structure); + av_assert0(len <= 32); + + if (len < h->ref_count[list]) + memset(&h->default_ref_list[list][len], 0, sizeof(Picture) * (h->ref_count[list] - len)); + lens[list] = len; + } + + if (lens[0] == lens[1] && lens[1] > 1) { + for (i = 0; h->default_ref_list[0][i].f.data[0] == h->default_ref_list[1][i].f.data[0] && i < lens[0]; i++); + if (i == lens[0]) { + Picture tmp; + COPY_PICTURE(&tmp, &h->default_ref_list[1][0]); + COPY_PICTURE(&h->default_ref_list[1][0], &h->default_ref_list[1][1]); + COPY_PICTURE(&h->default_ref_list[1][1], &tmp); + } + } + } else { + len = build_def_list(h->default_ref_list[0], h->short_ref, h->short_ref_count, 0, h->picture_structure); + len += build_def_list(h->default_ref_list[0] + len, h-> long_ref, 16, 1, h->picture_structure); + av_assert0(len <= 32); + if (len < h->ref_count[0]) + memset(&h->default_ref_list[0][len], 0, sizeof(Picture) * (h->ref_count[0] - len)); + } +#ifdef TRACE + for (i = 0; i < h->ref_count[0]; i++) { + tprintf(h->avctx, "List0: %s fn:%d 0x%p\n", + (h->default_ref_list[0][i].long_ref ? "LT" : "ST"), + h->default_ref_list[0][i].pic_id, + h->default_ref_list[0][i].f.data[0]); + } + if (h->slice_type_nos == AV_PICTURE_TYPE_B) { + for (i = 0; i < h->ref_count[1]; i++) { + tprintf(h->avctx, "List1: %s fn:%d 0x%p\n", + (h->default_ref_list[1][i].long_ref ? "LT" : "ST"), + h->default_ref_list[1][i].pic_id, + h->default_ref_list[1][i].f.data[0]); + } + } +#endif + return 0; +} + +static void print_short_term(H264Context *h); +static void print_long_term(H264Context *h); + +/** + * Extract structure information about the picture described by pic_num in + * the current decoding context (frame or field). Note that pic_num is + * picture number without wrapping (so, 0<=pic_num<max_pic_num). + * @param pic_num picture number for which to extract structure information + * @param structure one of PICT_XXX describing structure of picture + * with pic_num + * @return frame number (short term) or long term index of picture + * described by pic_num + */ +static int pic_num_extract(H264Context *h, int pic_num, int *structure) +{ + *structure = h->picture_structure; + if (FIELD_PICTURE(h)) { + if (!(pic_num & 1)) + /* opposite field */ + *structure ^= PICT_FRAME; + pic_num >>= 1; + } + + return pic_num; +} + +int ff_h264_decode_ref_pic_list_reordering(H264Context *h) +{ + int list, index, pic_structure, i; + + print_short_term(h); + print_long_term(h); + + for (list = 0; list < h->list_count; list++) { + for (i = 0; i < h->ref_count[list]; i++) + COPY_PICTURE(&h->ref_list[list][i], &h->default_ref_list[list][i]); + + if (get_bits1(&h->gb)) { + int pred = h->curr_pic_num; + + for (index = 0; ; index++) { + unsigned int reordering_of_pic_nums_idc = get_ue_golomb_31(&h->gb); + unsigned int pic_id; + int i; + Picture *ref = NULL; + + if (reordering_of_pic_nums_idc == 3) + break; + + if (index >= h->ref_count[list]) { + av_log(h->avctx, AV_LOG_ERROR, "reference count overflow\n"); + return -1; + } + + if (reordering_of_pic_nums_idc < 3) { + if (reordering_of_pic_nums_idc < 2) { + const unsigned int abs_diff_pic_num = get_ue_golomb(&h->gb) + 1; + int frame_num; + + if (abs_diff_pic_num > h->max_pic_num) { + av_log(h->avctx, AV_LOG_ERROR, "abs_diff_pic_num overflow\n"); + return -1; + } + + if (reordering_of_pic_nums_idc == 0) + pred -= abs_diff_pic_num; + else + pred += abs_diff_pic_num; + pred &= h->max_pic_num - 1; + + frame_num = pic_num_extract(h, pred, &pic_structure); + + for (i = h->short_ref_count - 1; i >= 0; i--) { + ref = h->short_ref[i]; + assert(ref->reference); + assert(!ref->long_ref); + if (ref->frame_num == frame_num && + (ref->reference & pic_structure)) + break; + } + if (i >= 0) + ref->pic_id = pred; + } else { + int long_idx; + pic_id = get_ue_golomb(&h->gb); //long_term_pic_idx + + long_idx = pic_num_extract(h, pic_id, &pic_structure); + + if (long_idx > 31) { + av_log(h->avctx, AV_LOG_ERROR, "long_term_pic_idx overflow\n"); + return -1; + } + ref = h->long_ref[long_idx]; + assert(!(ref && !ref->reference)); + if (ref && (ref->reference & pic_structure)) { + ref->pic_id = pic_id; + assert(ref->long_ref); + i = 0; + } else { + i = -1; + } + } + + if (i < 0) { + av_log(h->avctx, AV_LOG_ERROR, "reference picture missing during reorder\n"); + memset(&h->ref_list[list][index], 0, sizeof(Picture)); //FIXME + } else { + for (i = index; i + 1 < h->ref_count[list]; i++) { + if (ref->long_ref == h->ref_list[list][i].long_ref && + ref->pic_id == h->ref_list[list][i].pic_id) + break; + } + for (; i > index; i--) { + COPY_PICTURE(&h->ref_list[list][i], &h->ref_list[list][i - 1]); + } + COPY_PICTURE(&h->ref_list[list][index], ref); + if (FIELD_PICTURE(h)) { + pic_as_field(&h->ref_list[list][index], pic_structure); + } + } + } else { + av_log(h->avctx, AV_LOG_ERROR, "illegal reordering_of_pic_nums_idc\n"); + return -1; + } + } + } + } + for (list = 0; list < h->list_count; list++) { + for (index = 0; index < h->ref_count[list]; index++) { + if ( !h->ref_list[list][index].f.data[0] + || (!FIELD_PICTURE(h) && (h->ref_list[list][index].reference&3) != 3)) { + int i; + av_log(h->avctx, AV_LOG_ERROR, "Missing reference picture, default is %d\n", h->default_ref_list[list][0].poc); + for (i = 0; i < FF_ARRAY_ELEMS(h->last_pocs); i++) + h->last_pocs[i] = INT_MIN; + if (h->default_ref_list[list][0].f.data[0] + && !(!FIELD_PICTURE(h) && (h->default_ref_list[list][0].reference&3) != 3)) + COPY_PICTURE(&h->ref_list[list][index], &h->default_ref_list[list][0]); + else + return -1; + } + } + } + + return 0; +} + +void ff_h264_fill_mbaff_ref_list(H264Context *h) +{ + int list, i, j; + for (list = 0; list < h->list_count; list++) { + for (i = 0; i < h->ref_count[list]; i++) { + Picture *frame = &h->ref_list[list][i]; + Picture *field = &h->ref_list[list][16 + 2 * i]; + COPY_PICTURE(field, frame); + for (j = 0; j < 3; j++) + field[0].f.linesize[j] <<= 1; + field[0].reference = PICT_TOP_FIELD; + field[0].poc = field[0].field_poc[0]; + COPY_PICTURE(field + 1, field); + for (j = 0; j < 3; j++) + field[1].f.data[j] += frame->f.linesize[j]; + field[1].reference = PICT_BOTTOM_FIELD; + field[1].poc = field[1].field_poc[1]; + + h->luma_weight[16 + 2 * i][list][0] = h->luma_weight[16 + 2 * i + 1][list][0] = h->luma_weight[i][list][0]; + h->luma_weight[16 + 2 * i][list][1] = h->luma_weight[16 + 2 * i + 1][list][1] = h->luma_weight[i][list][1]; + for (j = 0; j < 2; j++) { + h->chroma_weight[16 + 2 * i][list][j][0] = h->chroma_weight[16 + 2 * i + 1][list][j][0] = h->chroma_weight[i][list][j][0]; + h->chroma_weight[16 + 2 * i][list][j][1] = h->chroma_weight[16 + 2 * i + 1][list][j][1] = h->chroma_weight[i][list][j][1]; + } + } + } +} + +/** + * Mark a picture as no longer needed for reference. The refmask + * argument allows unreferencing of individual fields or the whole frame. + * If the picture becomes entirely unreferenced, but is being held for + * display purposes, it is marked as such. + * @param refmask mask of fields to unreference; the mask is bitwise + * anded with the reference marking of pic + * @return non-zero if pic becomes entirely unreferenced (except possibly + * for display purposes) zero if one of the fields remains in + * reference + */ +static inline int unreference_pic(H264Context *h, Picture *pic, int refmask) +{ + int i; + if (pic->reference &= refmask) { + return 0; + } else { + for(i = 0; h->delayed_pic[i]; i++) + if(pic == h->delayed_pic[i]){ + pic->reference = DELAYED_PIC_REF; + break; + } + return 1; + } +} + +/** + * Find a Picture in the short term reference list by frame number. + * @param frame_num frame number to search for + * @param idx the index into h->short_ref where returned picture is found + * undefined if no picture found. + * @return pointer to the found picture, or NULL if no pic with the provided + * frame number is found + */ +static Picture *find_short(H264Context *h, int frame_num, int *idx) +{ + int i; + + for (i = 0; i < h->short_ref_count; i++) { + Picture *pic = h->short_ref[i]; + if (h->avctx->debug & FF_DEBUG_MMCO) + av_log(h->avctx, AV_LOG_DEBUG, "%d %d %p\n", i, pic->frame_num, pic); + if (pic->frame_num == frame_num) { + *idx = i; + return pic; + } + } + return NULL; +} + +/** + * Remove a picture from the short term reference list by its index in + * that list. This does no checking on the provided index; it is assumed + * to be valid. Other list entries are shifted down. + * @param i index into h->short_ref of picture to remove. + */ +static void remove_short_at_index(H264Context *h, int i) +{ + assert(i >= 0 && i < h->short_ref_count); + h->short_ref[i] = NULL; + if (--h->short_ref_count) + memmove(&h->short_ref[i], &h->short_ref[i + 1], + (h->short_ref_count - i) * sizeof(Picture*)); +} + +/** + * + * @return the removed picture or NULL if an error occurs + */ +static Picture *remove_short(H264Context *h, int frame_num, int ref_mask) +{ + Picture *pic; + int i; + + if (h->avctx->debug & FF_DEBUG_MMCO) + av_log(h->avctx, AV_LOG_DEBUG, "remove short %d count %d\n", frame_num, h->short_ref_count); + + pic = find_short(h, frame_num, &i); + if (pic) { + if (unreference_pic(h, pic, ref_mask)) + remove_short_at_index(h, i); + } + + return pic; +} + +/** + * Remove a picture from the long term reference list by its index in + * that list. + * @return the removed picture or NULL if an error occurs + */ +static Picture *remove_long(H264Context *h, int i, int ref_mask) +{ + Picture *pic; + + pic = h->long_ref[i]; + if (pic) { + if (unreference_pic(h, pic, ref_mask)) { + assert(h->long_ref[i]->long_ref == 1); + h->long_ref[i]->long_ref = 0; + h->long_ref[i] = NULL; + h->long_ref_count--; + } + } + + return pic; +} + +void ff_h264_remove_all_refs(H264Context *h) +{ + int i; + + for (i = 0; i < 16; i++) { + remove_long(h, i, 0); + } + assert(h->long_ref_count == 0); + + for (i = 0; i < h->short_ref_count; i++) { + unreference_pic(h, h->short_ref[i], 0); + h->short_ref[i] = NULL; + } + h->short_ref_count = 0; + + memset(h->default_ref_list, 0, sizeof(h->default_ref_list)); + memset(h->ref_list, 0, sizeof(h->ref_list)); +} + +/** + * print short term list + */ +static void print_short_term(H264Context *h) +{ + uint32_t i; + if (h->avctx->debug & FF_DEBUG_MMCO) { + av_log(h->avctx, AV_LOG_DEBUG, "short term list:\n"); + for (i = 0; i < h->short_ref_count; i++) { + Picture *pic = h->short_ref[i]; + av_log(h->avctx, AV_LOG_DEBUG, "%d fn:%d poc:%d %p\n", + i, pic->frame_num, pic->poc, pic->f.data[0]); + } + } +} + +/** + * print long term list + */ +static void print_long_term(H264Context *h) +{ + uint32_t i; + if (h->avctx->debug & FF_DEBUG_MMCO) { + av_log(h->avctx, AV_LOG_DEBUG, "long term list:\n"); + for (i = 0; i < 16; i++) { + Picture *pic = h->long_ref[i]; + if (pic) { + av_log(h->avctx, AV_LOG_DEBUG, "%d fn:%d poc:%d %p\n", + i, pic->frame_num, pic->poc, pic->f.data[0]); + } + } + } +} + +static int check_opcodes(MMCO *mmco1, MMCO *mmco2, int n_mmcos) +{ + int i; + + for (i = 0; i < n_mmcos; i++) { + if (mmco1[i].opcode != mmco2[i].opcode) { + av_log(NULL, AV_LOG_ERROR, "MMCO opcode [%d, %d] at %d mismatches between slices\n", + mmco1[i].opcode, mmco2[i].opcode, i); + return -1; + } + } + + return 0; +} + +int ff_generate_sliding_window_mmcos(H264Context *h, int first_slice) +{ + MMCO mmco_temp[MAX_MMCO_COUNT], *mmco = first_slice ? h->mmco : mmco_temp; + int mmco_index = 0, i; + + if (h->short_ref_count && + h->long_ref_count + h->short_ref_count >= h->sps.ref_frame_count && + !(FIELD_PICTURE(h) && !h->first_field && h->cur_pic_ptr->reference)) { + mmco[0].opcode = MMCO_SHORT2UNUSED; + mmco[0].short_pic_num = h->short_ref[h->short_ref_count - 1]->frame_num; + mmco_index = 1; + if (FIELD_PICTURE(h)) { + mmco[0].short_pic_num *= 2; + mmco[1].opcode = MMCO_SHORT2UNUSED; + mmco[1].short_pic_num = mmco[0].short_pic_num + 1; + mmco_index = 2; + } + } + + if (first_slice) { + h->mmco_index = mmco_index; + } else if (!first_slice && mmco_index >= 0 && + (mmco_index != h->mmco_index || + (i = check_opcodes(h->mmco, mmco_temp, mmco_index)))) { + av_log(h->avctx, AV_LOG_ERROR, + "Inconsistent MMCO state between slices [%d, %d]\n", + mmco_index, h->mmco_index); + return AVERROR_INVALIDDATA; + } + return 0; +} + +int ff_h264_execute_ref_pic_marking(H264Context *h, MMCO *mmco, int mmco_count) +{ + int i, av_uninit(j); + int current_ref_assigned = 0, err = 0; + Picture *av_uninit(pic); + + if ((h->avctx->debug & FF_DEBUG_MMCO) && mmco_count == 0) + av_log(h->avctx, AV_LOG_DEBUG, "no mmco here\n"); + + for (i = 0; i < mmco_count; i++) { + int av_uninit(structure), av_uninit(frame_num); + if (h->avctx->debug & FF_DEBUG_MMCO) + av_log(h->avctx, AV_LOG_DEBUG, "mmco:%d %d %d\n", h->mmco[i].opcode, + h->mmco[i].short_pic_num, h->mmco[i].long_arg); + + if (mmco[i].opcode == MMCO_SHORT2UNUSED || + mmco[i].opcode == MMCO_SHORT2LONG) { + frame_num = pic_num_extract(h, mmco[i].short_pic_num, &structure); + pic = find_short(h, frame_num, &j); + if (!pic) { + if (mmco[i].opcode != MMCO_SHORT2LONG || + !h->long_ref[mmco[i].long_arg] || + h->long_ref[mmco[i].long_arg]->frame_num != frame_num) { + av_log(h->avctx, AV_LOG_ERROR, "mmco: unref short failure\n"); + err = AVERROR_INVALIDDATA; + } + continue; + } + } + + switch (mmco[i].opcode) { + case MMCO_SHORT2UNUSED: + if (h->avctx->debug & FF_DEBUG_MMCO) + av_log(h->avctx, AV_LOG_DEBUG, "mmco: unref short %d count %d\n", + h->mmco[i].short_pic_num, h->short_ref_count); + remove_short(h, frame_num, structure ^ PICT_FRAME); + break; + case MMCO_SHORT2LONG: + if (h->long_ref[mmco[i].long_arg] != pic) + remove_long(h, mmco[i].long_arg, 0); + + remove_short_at_index(h, j); + h->long_ref[ mmco[i].long_arg ] = pic; + if (h->long_ref[mmco[i].long_arg]) { + h->long_ref[mmco[i].long_arg]->long_ref = 1; + h->long_ref_count++; + } + break; + case MMCO_LONG2UNUSED: + j = pic_num_extract(h, mmco[i].long_arg, &structure); + pic = h->long_ref[j]; + if (pic) { + remove_long(h, j, structure ^ PICT_FRAME); + } else if (h->avctx->debug & FF_DEBUG_MMCO) + av_log(h->avctx, AV_LOG_DEBUG, "mmco: unref long failure\n"); + break; + case MMCO_LONG: + // Comment below left from previous code as it is an interresting note. + /* First field in pair is in short term list or + * at a different long term index. + * This is not allowed; see 7.4.3.3, notes 2 and 3. + * Report the problem and keep the pair where it is, + * and mark this field valid. + */ + + if (h->long_ref[mmco[i].long_arg] != h->cur_pic_ptr) { + remove_long(h, mmco[i].long_arg, 0); + + h->long_ref[mmco[i].long_arg] = h->cur_pic_ptr; + h->long_ref[mmco[i].long_arg]->long_ref = 1; + h->long_ref_count++; + } + + h->cur_pic_ptr->reference |= h->picture_structure; + current_ref_assigned = 1; + break; + case MMCO_SET_MAX_LONG: + assert(mmco[i].long_arg <= 16); + // just remove the long term which index is greater than new max + for (j = mmco[i].long_arg; j < 16; j++) { + remove_long(h, j, 0); + } + break; + case MMCO_RESET: + while (h->short_ref_count) { + remove_short(h, h->short_ref[0]->frame_num, 0); + } + for (j = 0; j < 16; j++) { + remove_long(h, j, 0); + } + h->frame_num = h->cur_pic_ptr->frame_num = 0; + h->mmco_reset = 1; + h->cur_pic_ptr->mmco_reset = 1; + for (j = 0; j < MAX_DELAYED_PIC_COUNT; j++) + h->last_pocs[j] = INT_MIN; + break; + default: assert(0); + } + } + + if (!current_ref_assigned) { + /* Second field of complementary field pair; the first field of + * which is already referenced. If short referenced, it + * should be first entry in short_ref. If not, it must exist + * in long_ref; trying to put it on the short list here is an + * error in the encoded bit stream (ref: 7.4.3.3, NOTE 2 and 3). + */ + if (h->short_ref_count && h->short_ref[0] == h->cur_pic_ptr) { + /* Just mark the second field valid */ + h->cur_pic_ptr->reference = PICT_FRAME; + } else if (h->cur_pic_ptr->long_ref) { + av_log(h->avctx, AV_LOG_ERROR, "illegal short term reference " + "assignment for second field " + "in complementary field pair " + "(first field is long term)\n"); + err = AVERROR_INVALIDDATA; + } else { + pic = remove_short(h, h->cur_pic_ptr->frame_num, 0); + if (pic) { + av_log(h->avctx, AV_LOG_ERROR, "illegal short term buffer state detected\n"); + err = AVERROR_INVALIDDATA; + } + + if (h->short_ref_count) + memmove(&h->short_ref[1], &h->short_ref[0], + h->short_ref_count * sizeof(Picture*)); + + h->short_ref[0] = h->cur_pic_ptr; + h->short_ref_count++; + h->cur_pic_ptr->reference |= h->picture_structure; + } + } + + if (h->long_ref_count + h->short_ref_count > FFMAX(h->sps.ref_frame_count, 1)) { + + /* We have too many reference frames, probably due to corrupted + * stream. Need to discard one frame. Prevents overrun of the + * short_ref and long_ref buffers. + */ + av_log(h->avctx, AV_LOG_ERROR, + "number of reference frames (%d+%d) exceeds max (%d; probably " + "corrupt input), discarding one\n", + h->long_ref_count, h->short_ref_count, h->sps.ref_frame_count); + err = AVERROR_INVALIDDATA; + + if (h->long_ref_count && !h->short_ref_count) { + for (i = 0; i < 16; ++i) + if (h->long_ref[i]) + break; + + assert(i < 16); + remove_long(h, i, 0); + } else { + pic = h->short_ref[h->short_ref_count - 1]; + remove_short(h, pic->frame_num, 0); + } + } + + print_short_term(h); + print_long_term(h); + + if(err >= 0 && h->long_ref_count==0 && h->short_ref_count<=2 && h->pps.ref_count[0]<=1 + (h->picture_structure != PICT_FRAME) && h->cur_pic_ptr->f.pict_type == AV_PICTURE_TYPE_I){ + h->cur_pic_ptr->sync |= 1; + if(!h->avctx->has_b_frames) + h->sync = 2; + } + + return (h->avctx->err_recognition & AV_EF_EXPLODE) ? err : 0; +} + +int ff_h264_decode_ref_pic_marking(H264Context *h, GetBitContext *gb, + int first_slice) +{ + int i, ret; + MMCO mmco_temp[MAX_MMCO_COUNT], *mmco = first_slice ? h->mmco : mmco_temp; + int mmco_index = 0; + + if (h->nal_unit_type == NAL_IDR_SLICE) { // FIXME fields + skip_bits1(gb); // broken_link + if (get_bits1(gb)) { + mmco[0].opcode = MMCO_LONG; + mmco[0].long_arg = 0; + mmco_index = 1; + } + } else { + if (get_bits1(gb)) { // adaptive_ref_pic_marking_mode_flag + for (i = 0; i < MAX_MMCO_COUNT; i++) { + MMCOOpcode opcode = get_ue_golomb_31(gb); + + mmco[i].opcode = opcode; + if (opcode == MMCO_SHORT2UNUSED || opcode == MMCO_SHORT2LONG) { + mmco[i].short_pic_num = + (h->curr_pic_num - get_ue_golomb(gb) - 1) & + (h->max_pic_num - 1); +#if 0 + if (mmco[i].short_pic_num >= h->short_ref_count || + h->short_ref[ mmco[i].short_pic_num ] == NULL){ + av_log(s->avctx, AV_LOG_ERROR, + "illegal short ref in memory management control " + "operation %d\n", mmco); + return -1; + } +#endif + } + if (opcode == MMCO_SHORT2LONG || opcode == MMCO_LONG2UNUSED || + opcode == MMCO_LONG || opcode == MMCO_SET_MAX_LONG) { + unsigned int long_arg = get_ue_golomb_31(gb); + if (long_arg >= 32 || + (long_arg >= 16 && !(opcode == MMCO_SET_MAX_LONG && + long_arg == 16) && + !(opcode == MMCO_LONG2UNUSED && FIELD_PICTURE(h)))) { + av_log(h->avctx, AV_LOG_ERROR, + "illegal long ref in memory management control " + "operation %d\n", opcode); + return -1; + } + mmco[i].long_arg = long_arg; + } + + if (opcode > (unsigned) MMCO_LONG) { + av_log(h->avctx, AV_LOG_ERROR, + "illegal memory management control operation %d\n", + opcode); + return -1; + } + if (opcode == MMCO_END) + break; + } + mmco_index = i; + } else { + if (first_slice) { + ret = ff_generate_sliding_window_mmcos(h, first_slice); + if (ret < 0 && h->avctx->err_recognition & AV_EF_EXPLODE) + return ret; + } + mmco_index = -1; + } + } + + if (first_slice && mmco_index != -1) { + h->mmco_index = mmco_index; + } else if (!first_slice && mmco_index >= 0 && + (mmco_index != h->mmco_index || + (i = check_opcodes(h->mmco, mmco_temp, mmco_index)))) { + av_log(h->avctx, AV_LOG_ERROR, + "Inconsistent MMCO state between slices [%d, %d]\n", + mmco_index, h->mmco_index); + return AVERROR_INVALIDDATA; + } + + return 0; +} |