---
libavcodec/h264_parser.c | 148 ++++++++++++++++++++++++++++++++++++++++++++++-
1 file changed, 146 insertions(+), 2 deletions(-)
diff --git a/libavcodec/h264_parser.c b/libavcodec/h264_parser.c
index ef5da98..f137260 100644
--- a/libavcodec/h264_parser.c
+++ b/libavcodec/h264_parser.c
@@ -106,6 +106,7 @@ static inline int parse_nal_units(AVCodecParserContext *s,
int state = -1;
const uint8_t *ptr;
int field_poc[2];
+ MMCOOpcode opcode;
/* set some sane default values */
s->pict_type = AV_PICTURE_TYPE_I;
@@ -132,8 +133,16 @@ static inline int parse_nal_units(AVCodecParserContext *s,
case NAL_SLICE:
case NAL_IDR_SLICE:
// Do not walk the whole buffer just to decode slice header
- if (src_length > 20)
- src_length = 20;
+ if (state & 0x1f == NAL_IDR_SLICE || (state >> 5) & 0x3 == 0) {
+ /* IDR or disposable slice
+ * No need to decode many bytes because MMCOs shall not be
present. */
+ if (src_length > 60)
+ src_length = 60;
+ } else {
+ /* To decode up to MMCOs */
+ if (src_length > 1000)
+ src_length = 1000;
+ }
break;
}
ptr = ff_h264_decode_nal(h, buf, &dst_length, &consumed, src_length);
@@ -219,8 +228,143 @@ static inline int parse_nal_units(AVCodecParserContext *s,
h->delta_poc[1] = get_se_golomb(&h->gb);
}
+ /* Decode POC of this picture here.
+ * The prev_ values needed for decoding POC are not set here. */
+ field_poc[0] = field_poc[1] = INT_MAX;
ff_init_poc(h, field_poc, &s->output_picture_number);
+ opcode = MMCO_END;
+ if (h->nal_ref_idc && h->nal_unit_type != NAL_IDR_SLICE) {
+ /* Continue parsing to check if MMCO_RESET is present.
+ * FIXME: MMCO_RESET could appear in the non-first slice.
+ * Maybe, we should parse all undisposable non-IDR
slice of this
+ * picture until encountering MMCO_RESET in a slice of
it. */
+ unsigned int slice_type_nos = s->pict_type & 3;
+ int max_refs = h->picture_structure == PICT_FRAME ? 16 : 32;
+
+ if (h->pps.redundant_pic_cnt_present)
+ get_ue_golomb(&h->gb); // redundant_pic_count
+
+ h->ref_count[0] = h->pps.ref_count[0];
+ h->ref_count[1] = h->pps.ref_count[1];
+ if (slice_type_nos != AV_PICTURE_TYPE_I) {
+ if (slice_type_nos == AV_PICTURE_TYPE_B)
+ get_bits1(&h->gb); // direct_spatial_mv_pred
+
+ if (get_bits1(&h->gb)) { //
num_ref_idx_active_override_flag
+ h->ref_count[0] = get_ue_golomb(&h->gb) + 1;
+ if (h->ref_count[0] < 1)
+ return AVERROR_INVALIDDATA;
+ if (slice_type_nos == AV_PICTURE_TYPE_B) {
+ h->ref_count[1] = get_ue_golomb(&h->gb) + 1;
+ if (h->ref_count[1] < 1)
+ return AVERROR_INVALIDDATA;
+ }
+ }
+
+ if (slice_type_nos == AV_PICTURE_TYPE_B)
+ h->list_count = 2;
+ else
+ h->list_count = 1;
+ } else {
+ h->list_count = 0;
+ h->ref_count[0] = h->ref_count[1] = 0;
+ }
+
+ if (h->ref_count[0] > max_refs || h->ref_count[1] > max_refs) {
+ av_log(h->avctx, AV_LOG_ERROR, "reference overflow\n");
+ return AVERROR_INVALIDDATA;
+ }
+
+ if (slice_type_nos != AV_PICTURE_TYPE_I) {
+ int list;
+ for (list = 0; list < h->list_count; list++) {
+ if (get_bits1(&h->gb)) {
+ int index;
+ for (index = 0; ; index++) {
+ unsigned int reordering_of_pic_nums_idc =
get_ue_golomb_31(&h->gb);
+
+ if (reordering_of_pic_nums_idc < 3)
+ get_ue_golomb(&h->gb);
+ else if (reordering_of_pic_nums_idc > 3) {
+ av_log(h->avctx, AV_LOG_ERROR,
+ "illegal reordering_of_pic_nums_idc
%d\n",
+ reordering_of_pic_nums_idc);
+ return AVERROR_INVALIDDATA;
+ } else
+ break;
+
+ if (index >= h->ref_count[list]) {
+ av_log(h->avctx, AV_LOG_ERROR, "reference
count overflow\n");
+ return AVERROR_INVALIDDATA;
+ }
+ }
+ }
+ }
+ }
+
+ if ((h->pps.weighted_pred && slice_type_nos ==
AV_PICTURE_TYPE_P) ||
+ (h->pps.weighted_bipred_idc == 1 && slice_type_nos ==
AV_PICTURE_TYPE_B)) {
+ int list;
+
+ get_ue_golomb(&h->gb); // luma_log2_weight_denom
+ if (h->sps.chroma_format_idc)
+ get_ue_golomb(&h->gb); // chroma_log2_weight_denom
+ for (list = 0; list < h->list_count; list++) {
+ int i;
+ for (i = 0; i < h->ref_count[list]; i++) {
+ if (get_bits1(&h->gb)) { // luma_weight_flag
+ get_se_golomb(&h->gb); // luma_weight
+ get_se_golomb(&h->gb); // luma_offset
+
+ if (h->sps.chroma_format_idc) {
+ if (get_bits1(&h->gb)) { //
chroma_weight_flag
+ int j;
+ for (j = 0; j < 2; j++) {
+ get_se_golomb(&h->gb); //
chroma_weight
+ get_se_golomb(&h->gb); //
chroma_offset
+ }
+ }
+ }
+ }
+ }
+ }
+ }
+
+ if (get_bits1(&h->gb)) { // adaptive_ref_pic_marking_mode_flag
+ int i;
+ for (i = 0; i < MAX_MMCO_COUNT; i++) {
+ opcode = get_ue_golomb_31(&h->gb);
+ if (opcode > (unsigned) MMCO_LONG) {
+ av_log(h->avctx, AV_LOG_ERROR,
+ "illegal memory management control
operation %d\n",
+ opcode);
+ return AVERROR_INVALIDDATA;
+ }
+ if (opcode == MMCO_END || opcode == MMCO_RESET)
+ break;
+
+ if (opcode == MMCO_SHORT2UNUSED || opcode ==
MMCO_SHORT2LONG)
+ get_ue_golomb(&h->gb);
+ if (opcode == MMCO_SHORT2LONG || opcode ==
MMCO_LONG2UNUSED ||
+ opcode == MMCO_LONG || opcode == MMCO_SET_MAX_LONG)
+ get_ue_golomb_31(&h->gb);
+ }
+ }
+ }
+
+ /* Set up the prev_ values for decoding POC. */
+ h->prev_frame_num = h->frame_num;
+ h->prev_frame_num_offset = opcode != MMCO_RESET ?
h->frame_num_offset : 0;
+ if (h->nal_ref_idc != 0) {
+ h->prev_poc_msb = h->poc_msb;
+ if (opcode != MMCO_RESET)
+ h->prev_poc_lsb = h->poc_lsb;
+ else
+ h->prev_poc_lsb =
+ h->picture_structure == PICT_BOTTOM_FIELD ? 0 :
field_poc[0];
+ }
+
if (h->sps.pic_struct_present_flag) {
switch (h->sei_pic_struct) {
case SEI_PIC_STRUCT_TOP_FIELD:
--
1.8.3.msysgit.0
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