+ pc->state = 7;
+ pc->frame_start_found = 0;
+ return i - (state & 5);
+}
+
+static int scan_mmco_reset(AVCodecParserContext *s)
+{
+ H264ParseContext *p = s->priv_data;
+ H264Context *h = &p->h;
+ H264SliceContext *sl = &h->slice_ctx[0];
+
+ sl->slice_type_nos = s->pict_type & 3;
+
+ if (h->pps.redundant_pic_cnt_present)
+ get_ue_golomb(&sl->gb); // redundant_pic_count
+
+ if (ff_set_ref_count(h, sl) < 0)
+ return AVERROR_INVALIDDATA;
+
+ if (sl->slice_type_nos != AV_PICTURE_TYPE_I) {
+ int list;
+ for (list = 0; list < sl->list_count; list++) {
+ if (get_bits1(&sl->gb)) {
+ int index;
+ for (index = 0; ; index++) {
+ unsigned int reordering_of_pic_nums_idc = get_ue_golomb_31(&sl->gb);
+
+ if (reordering_of_pic_nums_idc < 3)
+ get_ue_golomb(&sl->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 >= sl->ref_count[list]) {
+ av_log(h->avctx, AV_LOG_ERROR,
+ "reference count %d overflow\n", index);
+ return AVERROR_INVALIDDATA;
+ }
+ }
+ }
+ }
+ }
+
+ if ((h->pps.weighted_pred && sl->slice_type_nos == AV_PICTURE_TYPE_P) ||
+ (h->pps.weighted_bipred_idc == 1 && sl->slice_type_nos == AV_PICTURE_TYPE_B))
+ ff_pred_weight_table(h, sl);
+
+ if (get_bits1(&sl->gb)) { // adaptive_ref_pic_marking_mode_flag
+ int i;
+ for (i = 0; i < MAX_MMCO_COUNT; i++) {
+ MMCOOpcode opcode = get_ue_golomb_31(&sl->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)
+ return 0;
+ else if (opcode == MMCO_RESET)
+ return 1;
+
+ if (opcode == MMCO_SHORT2UNUSED || opcode == MMCO_SHORT2LONG)
+ get_ue_golomb(&sl->gb);
+ if (opcode == MMCO_SHORT2LONG || opcode == MMCO_LONG2UNUSED ||
+ opcode == MMCO_LONG || opcode == MMCO_SET_MAX_LONG)
+ get_ue_golomb_31(&sl->gb);
+ }
+ }
+
+ return 0;
+}
+
+/**
+ * Parse NAL units of found picture and decode some basic information.
+ *
+ * @param s parser context.
+ * @param avctx codec context.
+ * @param buf buffer with field/frame data.
+ * @param buf_size size of the buffer.
+ */
+static inline int parse_nal_units(AVCodecParserContext *s,
+ AVCodecContext *avctx,
+ const uint8_t *buf, int buf_size)
+{
+ H264ParseContext *p = s->priv_data;
+ H264Context *h = &p->h;
+ H264SliceContext *sl = &h->slice_ctx[0];
+ const uint8_t *buf_end = buf + buf_size;
+ unsigned int pps_id;
+ unsigned int slice_type;
+ int state = -1, got_reset = 0;
+ const uint8_t *ptr;
+ int field_poc[2];
+
+ /* set some sane default values */
+ s->pict_type = AV_PICTURE_TYPE_I;
+ s->key_frame = 0;
+ s->picture_structure = AV_PICTURE_STRUCTURE_UNKNOWN;
+
+ h->avctx = avctx;
+ ff_h264_reset_sei(h);
+
+ if (!buf_size)
+ return 0;
+
+ for (;;) {
+ int src_length, dst_length, consumed;
+ buf = avpriv_find_start_code(buf, buf_end, &state);
+ if (buf >= buf_end)
+ break;
+ --buf;
+ src_length = buf_end - buf;
+ switch (state & 0x1f) {
+ case NAL_SLICE:
+ case NAL_IDR_SLICE:
+ // Do not walk the whole buffer just to decode slice header
+ 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, sl, buf, &dst_length, &consumed, src_length);
+ if (!ptr || dst_length < 0)
+ break;
+
+ init_get_bits(&h->gb, ptr, 8 * dst_length);
+ switch (h->nal_unit_type) {
+ case NAL_SPS:
+ ff_h264_decode_seq_parameter_set(h);
+ break;
+ case NAL_PPS:
+ ff_h264_decode_picture_parameter_set(h, h->gb.size_in_bits);
+ break;
+ case NAL_SEI:
+ ff_h264_decode_sei(h);
+ break;
+ case NAL_IDR_SLICE:
+ s->key_frame = 1;
+
+ h->prev_frame_num = 0;
+ h->prev_frame_num_offset = 0;
+ h->prev_poc_msb =
+ h->prev_poc_lsb = 0;
+ /* fall through */
+ case NAL_SLICE:
+ init_get_bits(&sl->gb, ptr, 8 * dst_length);
+ get_ue_golomb(&sl->gb); // skip first_mb_in_slice
+ slice_type = get_ue_golomb_31(&sl->gb);
+ s->pict_type = golomb_to_pict_type[slice_type % 5];
+ if (h->sei_recovery_frame_cnt >= 0) {
+ /* key frame, since recovery_frame_cnt is set */
+ s->key_frame = 1;
+ }
+ pps_id = get_ue_golomb(&sl->gb);
+ if (pps_id >= MAX_PPS_COUNT) {
+ av_log(h->avctx, AV_LOG_ERROR,
+ "pps_id %u out of range\n", pps_id);
+ return -1;
+ }
+ if (!h->pps_buffers[pps_id]) {
+ av_log(h->avctx, AV_LOG_ERROR,
+ "non-existing PPS %u referenced\n", pps_id);
+ return -1;
+ }
+ h->pps = *h->pps_buffers[pps_id];
+ if (!h->sps_buffers[h->pps.sps_id]) {
+ av_log(h->avctx, AV_LOG_ERROR,
+ "non-existing SPS %u referenced\n", h->pps.sps_id);
+ return -1;
+ }
+ h->sps = *h->sps_buffers[h->pps.sps_id];
+ h->frame_num = get_bits(&sl->gb, h->sps.log2_max_frame_num);
+
+ s->coded_width = 16 * h->sps.mb_width;
+ s->coded_height = 16 * h->sps.mb_height;
+ s->width = s->coded_width - (h->sps.crop_right + h->sps.crop_left);
+ s->height = s->coded_height - (h->sps.crop_top + h->sps.crop_bottom);
+ if (s->width <= 0 || s->height <= 0) {
+ s->width = s->coded_width;
+ s->height = s->coded_height;
+ }
+
+ switch (h->sps.bit_depth_luma) {
+ case 9:
+ if (CHROMA444(h)) s->format = AV_PIX_FMT_YUV444P9;
+ else if (CHROMA422(h)) s->format = AV_PIX_FMT_YUV422P9;
+ else s->format = AV_PIX_FMT_YUV420P9;
+ break;
+ case 10:
+ if (CHROMA444(h)) s->format = AV_PIX_FMT_YUV444P10;
+ else if (CHROMA422(h)) s->format = AV_PIX_FMT_YUV422P10;
+ else s->format = AV_PIX_FMT_YUV420P10;
+ break;
+ case 8:
+ if (CHROMA444(h)) s->format = AV_PIX_FMT_YUV444P;
+ else if (CHROMA422(h)) s->format = AV_PIX_FMT_YUV422P;
+ else s->format = AV_PIX_FMT_YUV420P;
+ break;
+ default:
+ s->format = AV_PIX_FMT_NONE;
+ }
+
+ avctx->profile = ff_h264_get_profile(&h->sps);
+ avctx->level = h->sps.level_idc;
+
+ if (h->sps.frame_mbs_only_flag) {
+ h->picture_structure = PICT_FRAME;
+ } else {
+ if (get_bits1(&sl->gb)) { // field_pic_flag
+ h->picture_structure = PICT_TOP_FIELD + get_bits1(&sl->gb); // bottom_field_flag
+ } else {
+ h->picture_structure = PICT_FRAME;
+ }
+ }
+
+ if (h->nal_unit_type == NAL_IDR_SLICE)
+ get_ue_golomb(&sl->gb); /* idr_pic_id */
+ if (h->sps.poc_type == 0) {
+ h->poc_lsb = get_bits(&sl->gb, h->sps.log2_max_poc_lsb);
+
+ if (h->pps.pic_order_present == 1 &&
+ h->picture_structure == PICT_FRAME)
+ h->delta_poc_bottom = get_se_golomb(&sl->gb);
+ }
+
+ if (h->sps.poc_type == 1 &&
+ !h->sps.delta_pic_order_always_zero_flag) {
+ h->delta_poc[0] = get_se_golomb(&sl->gb);
+
+ if (h->pps.pic_order_present == 1 &&
+ h->picture_structure == PICT_FRAME)
+ h->delta_poc[1] = get_se_golomb(&sl->gb);
+ }
+
+ /* Decode POC of this picture.
+ * The prev_ values needed for decoding POC of the next picture are not set here. */
+ field_poc[0] = field_poc[1] = INT_MAX;
+ ff_init_poc(h, field_poc, &s->output_picture_number);
+
+ /* Continue parsing to check if MMCO_RESET is present.
+ * FIXME: MMCO_RESET could appear in non-first slice.
+ * Maybe, we should parse all undisposable non-IDR slice of this
+ * picture until encountering MMCO_RESET in a slice of it. */
+ if (h->nal_ref_idc && h->nal_unit_type != NAL_IDR_SLICE) {
+ got_reset = scan_mmco_reset(s);
+ if (got_reset < 0)
+ return got_reset;
+ }
+
+ /* Set up the prev_ values for decoding POC of the next picture. */
+ h->prev_frame_num = got_reset ? 0 : h->frame_num;
+ h->prev_frame_num_offset = got_reset ? 0 : h->frame_num_offset;
+ if (h->nal_ref_idc != 0) {
+ if (!got_reset) {
+ h->prev_poc_msb = h->poc_msb;
+ h->prev_poc_lsb = h->poc_lsb;
+ } else {
+ h->prev_poc_msb = 0;
+ 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:
+ case SEI_PIC_STRUCT_BOTTOM_FIELD:
+ s->repeat_pict = 0;
+ break;
+ case SEI_PIC_STRUCT_FRAME:
+ case SEI_PIC_STRUCT_TOP_BOTTOM:
+ case SEI_PIC_STRUCT_BOTTOM_TOP:
+ s->repeat_pict = 1;
+ break;
+ case SEI_PIC_STRUCT_TOP_BOTTOM_TOP:
+ case SEI_PIC_STRUCT_BOTTOM_TOP_BOTTOM:
+ s->repeat_pict = 2;
+ break;
+ case SEI_PIC_STRUCT_FRAME_DOUBLING:
+ s->repeat_pict = 3;
+ break;
+ case SEI_PIC_STRUCT_FRAME_TRIPLING:
+ s->repeat_pict = 5;
+ break;
+ default:
+ s->repeat_pict = h->picture_structure == PICT_FRAME ? 1 : 0;
+ break;
+ }
+ } else {
+ s->repeat_pict = h->picture_structure == PICT_FRAME ? 1 : 0;
+ }
+
+ if (h->picture_structure == PICT_FRAME) {
+ s->picture_structure = AV_PICTURE_STRUCTURE_FRAME;
+ if (h->sps.pic_struct_present_flag) {
+ switch (h->sei_pic_struct) {
+ case SEI_PIC_STRUCT_TOP_BOTTOM:
+ case SEI_PIC_STRUCT_TOP_BOTTOM_TOP:
+ s->field_order = AV_FIELD_TT;
+ break;
+ case SEI_PIC_STRUCT_BOTTOM_TOP:
+ case SEI_PIC_STRUCT_BOTTOM_TOP_BOTTOM:
+ s->field_order = AV_FIELD_BB;
+ break;
+ default:
+ s->field_order = AV_FIELD_PROGRESSIVE;
+ break;
+ }
+ } else {
+ if (field_poc[0] < field_poc[1])
+ s->field_order = AV_FIELD_TT;
+ else if (field_poc[0] > field_poc[1])
+ s->field_order = AV_FIELD_BB;
+ else
+ s->field_order = AV_FIELD_PROGRESSIVE;
+ }
+ } else {
+ if (h->picture_structure == PICT_TOP_FIELD)
+ s->picture_structure = AV_PICTURE_STRUCTURE_TOP_FIELD;
+ else
+ s->picture_structure = AV_PICTURE_STRUCTURE_BOTTOM_FIELD;
+ s->field_order = AV_FIELD_UNKNOWN;
+ }
+
+ return 0; /* no need to evaluate the rest */
+ }
+ buf += consumed;
+ }
+ /* didn't find a picture! */
+ av_log(h->avctx, AV_LOG_ERROR, "missing picture in access unit\n");
+ return -1;