* H.26L/H.264/AVC/JVT/14496-10/... sei decoding
* 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
*/
* @author Michael Niedermayer <michaelni@gmx.at>
*/
-#include "internal.h"
#include "avcodec.h"
-#include "h264.h"
#include "golomb.h"
+#include "h264.h"
+#include "internal.h"
-//#undef NDEBUG
-#include <assert.h>
-
-static const uint8_t sei_num_clock_ts_table[9]={
- 1, 1, 1, 2, 2, 3, 3, 2, 3
+static const uint8_t sei_num_clock_ts_table[9] = {
+ 1, 1, 1, 2, 2, 3, 3, 2, 3
};
-void ff_h264_reset_sei(H264Context *h) {
+void ff_h264_reset_sei(H264Context *h)
+{
h->sei_recovery_frame_cnt = -1;
h->sei_dpb_output_delay = 0;
h->sei_cpb_removal_delay = -1;
h->sei_buffering_period_present = 0;
+ h->sei_frame_packing_present = 0;
+ h->sei_display_orientation_present = 0;
+ h->sei_reguserdata_afd_present = 0;
+
+ h->a53_caption_size = 0;
+ av_freep(&h->a53_caption);
}
-static int decode_picture_timing(H264Context *h){
- MpegEncContext * const s = &h->s;
- if(h->sps.nal_hrd_parameters_present_flag || h->sps.vcl_hrd_parameters_present_flag){
- h->sei_cpb_removal_delay = get_bits(&s->gb, h->sps.cpb_removal_delay_length);
- h->sei_dpb_output_delay = get_bits(&s->gb, h->sps.dpb_output_delay_length);
+static int decode_picture_timing(H264Context *h)
+{
+ if (h->sps.nal_hrd_parameters_present_flag ||
+ h->sps.vcl_hrd_parameters_present_flag) {
+ h->sei_cpb_removal_delay = get_bits(&h->gb,
+ h->sps.cpb_removal_delay_length);
+ h->sei_dpb_output_delay = get_bits(&h->gb,
+ h->sps.dpb_output_delay_length);
}
- if(h->sps.pic_struct_present_flag){
+ if (h->sps.pic_struct_present_flag) {
unsigned int i, num_clock_ts;
- h->sei_pic_struct = get_bits(&s->gb, 4);
+
+ h->sei_pic_struct = get_bits(&h->gb, 4);
h->sei_ct_type = 0;
if (h->sei_pic_struct > SEI_PIC_STRUCT_FRAME_TRIPLING)
- return -1;
+ return AVERROR_INVALIDDATA;
num_clock_ts = sei_num_clock_ts_table[h->sei_pic_struct];
- for (i = 0 ; i < num_clock_ts ; i++){
- if(get_bits(&s->gb, 1)){ /* clock_timestamp_flag */
+ for (i = 0; i < num_clock_ts; i++) {
+ if (get_bits(&h->gb, 1)) { /* clock_timestamp_flag */
unsigned int full_timestamp_flag;
- h->sei_ct_type |= 1<<get_bits(&s->gb, 2);
- skip_bits(&s->gb, 1); /* nuit_field_based_flag */
- skip_bits(&s->gb, 5); /* counting_type */
- full_timestamp_flag = get_bits(&s->gb, 1);
- skip_bits(&s->gb, 1); /* discontinuity_flag */
- skip_bits(&s->gb, 1); /* cnt_dropped_flag */
- skip_bits(&s->gb, 8); /* n_frames */
- if(full_timestamp_flag){
- skip_bits(&s->gb, 6); /* seconds_value 0..59 */
- skip_bits(&s->gb, 6); /* minutes_value 0..59 */
- skip_bits(&s->gb, 5); /* hours_value 0..23 */
- }else{
- if(get_bits(&s->gb, 1)){ /* seconds_flag */
- skip_bits(&s->gb, 6); /* seconds_value range 0..59 */
- if(get_bits(&s->gb, 1)){ /* minutes_flag */
- skip_bits(&s->gb, 6); /* minutes_value 0..59 */
- if(get_bits(&s->gb, 1)) /* hours_flag */
- skip_bits(&s->gb, 5); /* hours_value 0..23 */
+
+ h->sei_ct_type |= 1 << get_bits(&h->gb, 2);
+ skip_bits(&h->gb, 1); /* nuit_field_based_flag */
+ skip_bits(&h->gb, 5); /* counting_type */
+ full_timestamp_flag = get_bits(&h->gb, 1);
+ skip_bits(&h->gb, 1); /* discontinuity_flag */
+ skip_bits(&h->gb, 1); /* cnt_dropped_flag */
+ skip_bits(&h->gb, 8); /* n_frames */
+ if (full_timestamp_flag) {
+ skip_bits(&h->gb, 6); /* seconds_value 0..59 */
+ skip_bits(&h->gb, 6); /* minutes_value 0..59 */
+ skip_bits(&h->gb, 5); /* hours_value 0..23 */
+ } else {
+ if (get_bits(&h->gb, 1)) { /* seconds_flag */
+ skip_bits(&h->gb, 6); /* seconds_value range 0..59 */
+ if (get_bits(&h->gb, 1)) { /* minutes_flag */
+ skip_bits(&h->gb, 6); /* minutes_value 0..59 */
+ if (get_bits(&h->gb, 1)) /* hours_flag */
+ skip_bits(&h->gb, 5); /* hours_value 0..23 */
}
}
}
- if(h->sps.time_offset_length > 0)
- skip_bits(&s->gb, h->sps.time_offset_length); /* time_offset */
+ if (h->sps.time_offset_length > 0)
+ skip_bits(&h->gb,
+ h->sps.time_offset_length); /* time_offset */
}
}
- if(s->avctx->debug & FF_DEBUG_PICT_INFO)
- av_log(s->avctx, AV_LOG_DEBUG, "ct_type:%X pic_struct:%d\n", h->sei_ct_type, h->sei_pic_struct);
+ if (h->avctx->debug & FF_DEBUG_PICT_INFO)
+ av_log(h->avctx, AV_LOG_DEBUG, "ct_type:%X pic_struct:%d\n",
+ h->sei_ct_type, h->sei_pic_struct);
}
return 0;
}
-static int decode_unregistered_user_data(H264Context *h, int size){
- MpegEncContext * const s = &h->s;
- uint8_t user_data[16+256];
- int e, build, i;
+static int decode_registered_user_data_afd(H264Context *h, int size)
+{
+ int flag;
- if(size<16)
- return -1;
+ if (size-- < 1)
+ return AVERROR_INVALIDDATA;
+ skip_bits(&h->gb, 1); // 0
+ flag = get_bits(&h->gb, 1); // active_format_flag
+ skip_bits(&h->gb, 6); // reserved
- for(i=0; i<sizeof(user_data)-1 && i<size; i++){
- user_data[i]= get_bits(&s->gb, 8);
+ if (flag) {
+ if (size-- < 1)
+ return AVERROR_INVALIDDATA;
+ skip_bits(&h->gb, 4); // reserved
+ h->active_format_description = get_bits(&h->gb, 4);
+ h->sei_reguserdata_afd_present = 1;
}
- user_data[i]= 0;
- e= sscanf(user_data+16, "x264 - core %d"/*%s - H.264/MPEG-4 AVC codec - Copyleft 2005 - http://www.videolan.org/x264.html*/, &build);
- if(e==1 && build>0)
- h->x264_build= build;
+ return 0;
+}
+
+static int decode_registered_user_data_closed_caption(H264Context *h, int size)
+{
+ int flag;
+ int user_data_type_code;
+ int cc_count;
+
+ if (size < 3)
+ return AVERROR(EINVAL);
- if(s->avctx->debug & FF_DEBUG_BUGS)
- av_log(s->avctx, AV_LOG_DEBUG, "user data:\"%s\"\n", user_data+16);
+ user_data_type_code = get_bits(&h->gb, 8);
+ if (user_data_type_code == 0x3) {
+ skip_bits(&h->gb, 1); // reserved
- for(; i<size; i++)
- skip_bits(&s->gb, 8);
+ flag = get_bits(&h->gb, 1); // process_cc_data_flag
+ if (flag) {
+ skip_bits(&h->gb, 1); // zero bit
+ cc_count = get_bits(&h->gb, 5);
+ skip_bits(&h->gb, 8); // reserved
+ size -= 2;
+
+ if (cc_count && size >= cc_count * 3) {
+ const uint64_t new_size = (h->a53_caption_size + cc_count
+ * UINT64_C(3));
+ int i, ret;
+
+ if (new_size > INT_MAX)
+ return AVERROR(EINVAL);
+
+ /* Allow merging of the cc data from two fields. */
+ ret = av_reallocp(&h->a53_caption, new_size);
+ if (ret < 0)
+ return ret;
+
+ for (i = 0; i < cc_count; i++) {
+ h->a53_caption[h->a53_caption_size++] = get_bits(&h->gb, 8);
+ h->a53_caption[h->a53_caption_size++] = get_bits(&h->gb, 8);
+ h->a53_caption[h->a53_caption_size++] = get_bits(&h->gb, 8);
+ }
+
+ skip_bits(&h->gb, 8); // marker_bits
+ }
+ }
+ } else {
+ int i;
+ avpriv_request_sample(h->avctx, "Subtitles with data type 0x%02x",
+ user_data_type_code);
+ for (i = 0; i < size - 1; i++)
+ skip_bits(&h->gb, 8);
+ }
return 0;
}
-static int decode_recovery_point(H264Context *h){
- MpegEncContext * const s = &h->s;
+static int decode_registered_user_data(H264Context *h, int size)
+{
+ uint32_t country_code;
+ uint32_t user_identifier;
+
+ if (size < 7)
+ return AVERROR_INVALIDDATA;
+ size -= 7;
+
+ country_code = get_bits(&h->gb, 8); // itu_t_t35_country_code
+ if (country_code == 0xFF) {
+ skip_bits(&h->gb, 8); // itu_t_t35_country_code_extension_byte
+ size--;
+ }
+
+ /* itu_t_t35_payload_byte follows */
+ skip_bits(&h->gb, 8); // terminal provider code
+ skip_bits(&h->gb, 8); // terminal provider oriented code
+ user_identifier = get_bits_long(&h->gb, 32);
- h->sei_recovery_frame_cnt = get_ue_golomb(&s->gb);
- skip_bits(&s->gb, 4); /* 1b exact_match_flag, 1b broken_link_flag, 2b changing_slice_group_idc */
+ switch (user_identifier) {
+ case MKBETAG('D', 'T', 'G', '1'): // afd_data
+ return decode_registered_user_data_afd(h, size);
+ case MKBETAG('G', 'A', '9', '4'): // closed captions
+ return decode_registered_user_data_closed_caption(h, size);
+ default:
+ skip_bits(&h->gb, size * 8);
+ break;
+ }
return 0;
}
-static int decode_buffering_period(H264Context *h){
- MpegEncContext * const s = &h->s;
+static int decode_unregistered_user_data(H264Context *h, int size)
+{
+ uint8_t user_data[16 + 256];
+ int e, build, i;
+
+ if (size < 16)
+ return AVERROR_INVALIDDATA;
+
+ for (i = 0; i < sizeof(user_data) - 1 && i < size; i++)
+ user_data[i] = get_bits(&h->gb, 8);
+
+ user_data[i] = 0;
+ e = sscanf(user_data + 16, "x264 - core %d", &build);
+ if (e == 1 && build > 0)
+ h->x264_build = build;
+
+ if (h->avctx->debug & FF_DEBUG_BUGS)
+ av_log(h->avctx, AV_LOG_DEBUG, "user data:\"%s\"\n", user_data + 16);
+
+ for (; i < size; i++)
+ skip_bits(&h->gb, 8);
+
+ return 0;
+}
+
+static int decode_recovery_point(H264Context *h)
+{
+ h->sei_recovery_frame_cnt = get_ue_golomb(&h->gb);
+
+ /* 1b exact_match_flag,
+ * 1b broken_link_flag,
+ * 2b changing_slice_group_idc */
+ skip_bits(&h->gb, 4);
+
+ return 0;
+}
+
+static int decode_buffering_period(H264Context *h)
+{
unsigned int sps_id;
int sched_sel_idx;
SPS *sps;
- sps_id = get_ue_golomb_31(&s->gb);
- if(sps_id > 31 || !h->sps_buffers[sps_id]) {
- av_log(h->s.avctx, AV_LOG_ERROR, "non-existing SPS %d referenced in buffering period\n", sps_id);
- return -1;
+ sps_id = get_ue_golomb_31(&h->gb);
+ if (sps_id > 31 || !h->sps_buffers[sps_id]) {
+ av_log(h->avctx, AV_LOG_ERROR,
+ "non-existing SPS %d referenced in buffering period\n", sps_id);
+ return AVERROR_INVALIDDATA;
}
sps = h->sps_buffers[sps_id];
// NOTE: This is really so duplicated in the standard... See H.264, D.1.1
if (sps->nal_hrd_parameters_present_flag) {
for (sched_sel_idx = 0; sched_sel_idx < sps->cpb_cnt; sched_sel_idx++) {
- h->initial_cpb_removal_delay[sched_sel_idx] = get_bits(&s->gb, sps->initial_cpb_removal_delay_length);
- skip_bits(&s->gb, sps->initial_cpb_removal_delay_length); // initial_cpb_removal_delay_offset
+ h->initial_cpb_removal_delay[sched_sel_idx] =
+ get_bits(&h->gb, sps->initial_cpb_removal_delay_length);
+ // initial_cpb_removal_delay_offset
+ skip_bits(&h->gb, sps->initial_cpb_removal_delay_length);
}
}
if (sps->vcl_hrd_parameters_present_flag) {
for (sched_sel_idx = 0; sched_sel_idx < sps->cpb_cnt; sched_sel_idx++) {
- h->initial_cpb_removal_delay[sched_sel_idx] = get_bits(&s->gb, sps->initial_cpb_removal_delay_length);
- skip_bits(&s->gb, sps->initial_cpb_removal_delay_length); // initial_cpb_removal_delay_offset
+ h->initial_cpb_removal_delay[sched_sel_idx] =
+ get_bits(&h->gb, sps->initial_cpb_removal_delay_length);
+ // initial_cpb_removal_delay_offset
+ skip_bits(&h->gb, sps->initial_cpb_removal_delay_length);
}
}
return 0;
}
-int ff_h264_decode_sei(H264Context *h){
- MpegEncContext * const s = &h->s;
+static int decode_frame_packing_arrangement(H264Context *h)
+{
+ get_ue_golomb(&h->gb); // frame_packing_arrangement_id
+ h->sei_frame_packing_present = !get_bits1(&h->gb);
+
+ if (h->sei_frame_packing_present) {
+ h->frame_packing_arrangement_type = get_bits(&h->gb, 7);
+ h->quincunx_subsampling = get_bits1(&h->gb);
+ h->content_interpretation_type = get_bits(&h->gb, 6);
+
+ // the following skips: spatial_flipping_flag, frame0_flipped_flag,
+ // field_views_flag, current_frame_is_frame0_flag,
+ // frame0_self_contained_flag, frame1_self_contained_flag
+ skip_bits(&h->gb, 6);
+
+ if (!h->quincunx_subsampling && h->frame_packing_arrangement_type != 5)
+ skip_bits(&h->gb, 16); // frame[01]_grid_position_[xy]
+ skip_bits(&h->gb, 8); // frame_packing_arrangement_reserved_byte
+ get_ue_golomb(&h->gb); // frame_packing_arrangement_repetition_period
+ }
+ skip_bits1(&h->gb); // frame_packing_arrangement_extension_flag
+
+ return 0;
+}
+
+static int decode_display_orientation(H264Context *h)
+{
+ h->sei_display_orientation_present = !get_bits1(&h->gb);
+
+ if (h->sei_display_orientation_present) {
+ h->sei_hflip = get_bits1(&h->gb); // hor_flip
+ h->sei_vflip = get_bits1(&h->gb); // ver_flip
+
+ h->sei_anticlockwise_rotation = get_bits(&h->gb, 16);
+ get_ue_golomb(&h->gb); // display_orientation_repetition_period
+ skip_bits1(&h->gb); // display_orientation_extension_flag
+ }
+
+ return 0;
+}
+
+int ff_h264_decode_sei(H264Context *h)
+{
+ while (get_bits_left(&h->gb) > 16) {
+ int size = 0;
+ int type = 0;
+ int ret = 0;
+ int last = 0;
- while(get_bits_count(&s->gb) + 16 < s->gb.size_in_bits){
- int size, type;
+ while (get_bits_left(&h->gb) >= 8 &&
+ (last = get_bits(&h->gb, 8)) == 255) {
+ type += 255;
+ }
+ type += last;
- type=0;
- do{
- type+= show_bits(&s->gb, 8);
- }while(get_bits(&s->gb, 8) == 255);
+ last = 0;
+ while (get_bits_left(&h->gb) >= 8 &&
+ (last = get_bits(&h->gb, 8)) == 255) {
+ size += 255;
+ }
+ size += last;
- size=0;
- do{
- size+= show_bits(&s->gb, 8);
- }while(get_bits(&s->gb, 8) == 255);
+ if (size > get_bits_left(&h->gb) / 8) {
+ av_log(h->avctx, AV_LOG_ERROR, "SEI type %d truncated at %d\n",
+ type, get_bits_left(&h->gb));
+ return AVERROR_INVALIDDATA;
+ }
- switch(type){
+ switch (type) {
case SEI_TYPE_PIC_TIMING: // Picture timing SEI
- if(decode_picture_timing(h) < 0)
- return -1;
+ ret = decode_picture_timing(h);
+ break;
+ case SEI_TYPE_USER_DATA_REGISTERED:
+ ret = decode_registered_user_data(h, size);
break;
case SEI_TYPE_USER_DATA_UNREGISTERED:
- if(decode_unregistered_user_data(h, size) < 0)
- return -1;
+ ret = decode_unregistered_user_data(h, size);
break;
case SEI_TYPE_RECOVERY_POINT:
- if(decode_recovery_point(h) < 0)
- return -1;
+ ret = decode_recovery_point(h);
+ break;
+ case SEI_TYPE_BUFFERING_PERIOD:
+ ret = decode_buffering_period(h);
+ break;
+ case SEI_TYPE_FRAME_PACKING:
+ ret = decode_frame_packing_arrangement(h);
break;
- case SEI_BUFFERING_PERIOD:
- if(decode_buffering_period(h) < 0)
- return -1;
+ case SEI_TYPE_DISPLAY_ORIENTATION:
+ ret = decode_display_orientation(h);
break;
default:
- skip_bits(&s->gb, 8*size);
+ av_log(h->avctx, AV_LOG_DEBUG, "unknown SEI type %d\n", type);
+ skip_bits(&h->gb, 8 * size);
}
+ if (ret < 0)
+ return ret;
- //FIXME check bits here
- align_get_bits(&s->gb);
+ // FIXME check bits here
+ align_get_bits(&h->gb);
}
return 0;
projects / ffmpeg / blobdiff