* H.26L/H.264/AVC/JVT/14496-10/... parser
* Copyright (c) 2003 Michael Niedermayer <michaelni@gmx.at>
*
- * This file is part of FFmpeg.
+ * This file is part of Libav.
*
- * FFmpeg is free software; you can redistribute it and/or
+ * Libav 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,
+ * Libav 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
+ * License along with Libav; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
- * @file h264_parser.c
+ * @file
* H.264 / AVC / MPEG4 part10 parser.
* @author Michael Niedermayer <michaelni@gmx.at>
*/
+#include "libavutil/attributes.h"
#include "parser.h"
-#include "h264_parser.h"
+#include "h264data.h"
+#include "golomb.h"
+#include "internal.h"
#include <assert.h>
-int ff_h264_find_frame_end(H264Context *h, const uint8_t *buf, int buf_size)
+static int h264_find_frame_end(H264Context *h, const uint8_t *buf,
+ int buf_size)
{
int i;
uint32_t state;
- ParseContext *pc = &(h->s.parse_context);
-//printf("first %02X%02X%02X%02X\n", buf[0], buf[1],buf[2],buf[3]);
+ ParseContext *pc = &h->parse_context;
// mb_addr= pc->mb_addr - 1;
- state= pc->state;
- if(state>13)
- state= 7;
-
- for(i=0; i<buf_size; i++){
- if(state==7){
- for(; i<buf_size; i++){
- if(!buf[i]){
- state=2;
- break;
- }
- }
- }else if(state<=2){
- if(buf[i]==1) state^= 5; //2->7, 1->4, 0->5
- else if(buf[i]) state = 7;
- else state>>=1; //2->1, 1->0, 0->0
- }else if(state<=5){
- int v= buf[i] & 0x1F;
- if(v==7 || v==8 || v==9){
- if(pc->frame_start_found){
+ state = pc->state;
+ if (state > 13)
+ state = 7;
+
+ for (i = 0; i < buf_size; i++) {
+ if (state == 7) {
+ i += h->h264dsp.h264_find_start_code_candidate(buf + i, buf_size - i);
+ if (i < buf_size)
+ state = 2;
+ } else if (state <= 2) {
+ if (buf[i] == 1)
+ state ^= 5; // 2->7, 1->4, 0->5
+ else if (buf[i])
+ state = 7;
+ else
+ state >>= 1; // 2->1, 1->0, 0->0
+ } else if (state <= 5) {
+ int v = buf[i] & 0x1F;
+ if (v == 6 || v == 7 || v == 8 || v == 9) {
+ if (pc->frame_start_found) {
i++;
-found:
- pc->state=7;
- pc->frame_start_found= 0;
- return i-(state&5);
+ goto found;
}
- }else if(v==1 || v==2 || v==5){
- if(pc->frame_start_found){
- state+=8;
+ } else if (v == 1 || v == 2 || v == 5) {
+ if (pc->frame_start_found) {
+ state += 8;
continue;
- }else
+ } else
pc->frame_start_found = 1;
}
- state= 7;
- }else{
- if(buf[i] & 0x80)
+ state = 7;
+ } else {
+ if (buf[i] & 0x80)
goto found;
- state= 7;
+ state = 7;
}
}
- pc->state= state;
+ pc->state = state;
return END_NOT_FOUND;
+
+found:
+ pc->state = 7;
+ pc->frame_start_found = 0;
+ return i - (state & 5);
+}
+
+static int scan_mmco_reset(AVCodecParserContext *s)
+{
+ H264Context *h = s->priv_data;
+
+ h->slice_type_nos = s->pict_type & 3;
+
+ if (h->pps.redundant_pic_cnt_present)
+ get_ue_golomb(&h->gb); // redundant_pic_count
+
+ if (ff_set_ref_count(h) < 0)
+ return AVERROR_INVALIDDATA;
+
+ if (h->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 && h->slice_type_nos == AV_PICTURE_TYPE_P) ||
+ (h->pps.weighted_bipred_idc == 1 && h->slice_type_nos == AV_PICTURE_TYPE_B))
+ ff_pred_weight_table(h);
+
+ if (get_bits1(&h->gb)) { // adaptive_ref_pic_marking_mode_flag
+ int i;
+ for (i = 0; i < MAX_MMCO_COUNT; i++) {
+ MMCOOpcode 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)
+ return 0;
+ else if (opcode == MMCO_RESET)
+ return 1;
+
+ 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);
+ }
+ }
+
+ 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)
+{
+ H264Context *h = s->priv_data;
+ 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, buf, &dst_length, &consumed, src_length);
+ if (ptr == NULL || 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:
+ get_ue_golomb(&h->gb); // skip first_mb_in_slice
+ slice_type = get_ue_golomb_31(&h->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(&h->gb);
+ if (pps_id >= MAX_PPS_COUNT) {
+ av_log(h->avctx, AV_LOG_ERROR,
+ "pps_id out of range\n");
+ return -1;
+ }
+ if (!h->pps_buffers[pps_id]) {
+ av_log(h->avctx, AV_LOG_ERROR,
+ "non-existing PPS referenced\n");
+ 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 referenced\n");
+ return -1;
+ }
+ h->sps = *h->sps_buffers[h->pps.sps_id];
+ h->frame_num = get_bits(&h->gb, h->sps.log2_max_frame_num);
+
+ 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(&h->gb)) { // field_pic_flag
+ h->picture_structure = PICT_TOP_FIELD + get_bits1(&h->gb); // bottom_field_flag
+ } else {
+ h->picture_structure = PICT_FRAME;
+ }
+ }
+
+ if (h->nal_unit_type == NAL_IDR_SLICE)
+ get_ue_golomb(&h->gb); /* idr_pic_id */
+ if (h->sps.poc_type == 0) {
+ h->poc_lsb = get_bits(&h->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(&h->gb);
+ }
+
+ if (h->sps.poc_type == 1 &&
+ !h->sps.delta_pic_order_always_zero_flag) {
+ h->delta_poc[0] = get_se_golomb(&h->gb);
+
+ if (h->pps.pic_order_present == 1 &&
+ h->picture_structure == PICT_FRAME)
+ h->delta_poc[1] = get_se_golomb(&h->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;
}
static int h264_parse(AVCodecParserContext *s,
const uint8_t **poutbuf, int *poutbuf_size,
const uint8_t *buf, int buf_size)
{
- H264Context *h = s->priv_data;
- ParseContext *pc = &h->s.parse_context;
+ H264Context *h = s->priv_data;
+ ParseContext *pc = &h->parse_context;
int next;
- if(s->flags & PARSER_FLAG_COMPLETE_FRAMES){
- next= buf_size;
- }else{
- next= ff_h264_find_frame_end(h, buf, buf_size);
+ if (!h->got_first) {
+ h->got_first = 1;
+ if (avctx->extradata_size) {
+ h->avctx = avctx;
+ // must be done like in the decoder.
+ // otherwise opening the parser, creating extradata,
+ // and then closing and opening again
+ // will cause has_b_frames to be always set.
+ // NB: estimate_timings_from_pts behaves exactly like this.
+ if (!avctx->has_b_frames)
+ h->low_delay = 1;
+ ff_h264_decode_extradata(h);
+ }
+ }
+
+ if (s->flags & PARSER_FLAG_COMPLETE_FRAMES) {
+ next = buf_size;
+ } else {
+ next = h264_find_frame_end(h, buf, buf_size);
if (ff_combine_frame(pc, next, &buf, &buf_size) < 0) {
- *poutbuf = NULL;
+ *poutbuf = NULL;
*poutbuf_size = 0;
return buf_size;
}
- if(next<0 && next != END_NOT_FOUND){
- assert(pc->last_index + next >= 0 );
- ff_h264_find_frame_end(h, &pc->buffer[pc->last_index + next], -next); //update state
+ if (next < 0 && next != END_NOT_FOUND) {
+ assert(pc->last_index + next >= 0);
+ h264_find_frame_end(h, &pc->buffer[pc->last_index + next], -next); // update state
}
}
- *poutbuf = buf;
+ parse_nal_units(s, avctx, buf, buf_size);
+
+ if (h->sei_cpb_removal_delay >= 0) {
+ s->dts_sync_point = h->sei_buffering_period_present;
+ s->dts_ref_dts_delta = h->sei_cpb_removal_delay;
+ s->pts_dts_delta = h->sei_dpb_output_delay;
+ } else {
+ s->dts_sync_point = INT_MIN;
+ s->dts_ref_dts_delta = INT_MIN;
+ s->pts_dts_delta = INT_MIN;
+ }
+
+ if (s->flags & PARSER_FLAG_ONCE) {
+ s->flags &= PARSER_FLAG_COMPLETE_FRAMES;
+ }
+
+ *poutbuf = buf;
*poutbuf_size = buf_size;
return next;
}
{
int i;
uint32_t state = -1;
- int has_sps= 0;
-
- for(i=0; i<=buf_size; i++){
- if((state&0xFFFFFF1F) == 0x107)
- has_sps=1;
-/* if((state&0xFFFFFF1F) == 0x101 || (state&0xFFFFFF1F) == 0x102 || (state&0xFFFFFF1F) == 0x105){
- }*/
- if((state&0xFFFFFF00) == 0x100 && (state&0xFFFFFF1F) != 0x107 && (state&0xFFFFFF1F) != 0x108 && (state&0xFFFFFF1F) != 0x109){
- if(has_sps){
- while(i>4 && buf[i-5]==0) i--;
- return i-4;
+ int has_sps = 0;
+
+ for (i = 0; i <= buf_size; i++) {
+ if ((state & 0xFFFFFF1F) == 0x107)
+ has_sps = 1;
+ /* if((state&0xFFFFFF1F) == 0x101 ||
+ * (state&0xFFFFFF1F) == 0x102 ||
+ * (state&0xFFFFFF1F) == 0x105) {
+ * }
+ */
+ if ((state & 0xFFFFFF00) == 0x100 && (state & 0xFFFFFF1F) != 0x107 &&
+ (state & 0xFFFFFF1F) != 0x108 && (state & 0xFFFFFF1F) != 0x109) {
+ if (has_sps) {
+ while (i > 4 && buf[i - 5] == 0)
+ i--;
+ return i - 4;
}
}
- if (i<buf_size)
- state= (state<<8) | buf[i];
+ if (i < buf_size)
+ state = (state << 8) | buf[i];
}
return 0;
}
+static void close(AVCodecParserContext *s)
+{
+ H264Context *h = s->priv_data;
+ ParseContext *pc = &h->parse_context;
+
+ av_free(pc->buffer);
+ ff_h264_free_context(h);
+}
+
+static av_cold int init(AVCodecParserContext *s)
+{
+ H264Context *h = s->priv_data;
+ h->thread_context[0] = h;
+ h->slice_context_count = 1;
+ ff_h264dsp_init(&h->h264dsp, 8, 1);
+ return 0;
+}
-AVCodecParser h264_parser = {
- { CODEC_ID_H264 },
- sizeof(H264Context),
- NULL,
- h264_parse,
- ff_parse_close,
- h264_split,
+AVCodecParser ff_h264_parser = {
+ .codec_ids = { AV_CODEC_ID_H264 },
+ .priv_data_size = sizeof(H264Context),
+ .parser_init = init,
+ .parser_parse = h264_parse,
+ .parser_close = close,
+ .split = h264_split,
};