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FFmpeg/libavcodec/h264dec.c

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/*
* H.26L/H.264/AVC/JVT/14496-10/... decoder
* 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 / MPEG-4 part10 codec.
* @author Michael Niedermayer <michaelni@gmx.at>
*/
#define UNCHECKED_BITSTREAM_READER 1
#include "config_components.h"
#include "libavutil/avassert.h"
#include "libavutil/emms.h"
#include "libavutil/imgutils.h"
#include "libavutil/mem.h"
#include "libavutil/opt.h"
#include "libavutil/thread.h"
#include "libavutil/video_enc_params.h"
#include "codec_internal.h"
#include "internal.h"
#include "error_resilience.h"
#include "avcodec.h"
#include "h264.h"
#include "h264dec.h"
#include "h2645_parse.h"
#include "h264data.h"
#include "h264_ps.h"
#include "golomb.h"
#include "hwaccel_internal.h"
#include "hwconfig.h"
#include "mpegutils.h"
#include "profiles.h"
#include "rectangle.h"
#include "refstruct.h"
#include "thread.h"
#include "threadframe.h"
const uint16_t ff_h264_mb_sizes[4] = { 256, 384, 512, 768 };
int avpriv_h264_has_num_reorder_frames(AVCodecContext *avctx)
{
H264Context *h = avctx->priv_data;
return h && h->ps.sps ? h->ps.sps->num_reorder_frames : 0;
}
static void h264_er_decode_mb(void *opaque, int ref, int mv_dir, int mv_type,
int (*mv)[2][4][2],
int mb_x, int mb_y, int mb_intra, int mb_skipped)
{
const H264Context *h = opaque;
H264SliceContext *sl = &h->slice_ctx[0];
sl->mb_x = mb_x;
sl->mb_y = mb_y;
sl->mb_xy = mb_x + mb_y * h->mb_stride;
memset(sl->non_zero_count_cache, 0, sizeof(sl->non_zero_count_cache));
av_assert1(ref >= 0);
/* FIXME: It is possible albeit uncommon that slice references
* differ between slices. We take the easy approach and ignore
* it for now. If this turns out to have any relevance in
* practice then correct remapping should be added. */
if (ref >= sl->ref_count[0])
ref = 0;
if (!sl->ref_list[0][ref].data[0]) {
av_log(h->avctx, AV_LOG_DEBUG, "Reference not available for error concealing\n");
ref = 0;
}
if ((sl->ref_list[0][ref].reference&3) != 3) {
av_log(h->avctx, AV_LOG_DEBUG, "Reference invalid\n");
return;
}
fill_rectangle(&h->cur_pic.ref_index[0][4 * sl->mb_xy],
2, 2, 2, ref, 1);
fill_rectangle(&sl->ref_cache[0][scan8[0]], 4, 4, 8, ref, 1);
fill_rectangle(sl->mv_cache[0][scan8[0]], 4, 4, 8,
pack16to32((*mv)[0][0][0], (*mv)[0][0][1]), 4);
sl->mb_mbaff =
sl->mb_field_decoding_flag = 0;
ff_h264_hl_decode_mb(h, &h->slice_ctx[0]);
}
void ff_h264_draw_horiz_band(const H264Context *h, H264SliceContext *sl,
int y, int height)
{
AVCodecContext *avctx = h->avctx;
const AVFrame *src = h->cur_pic.f;
const AVPixFmtDescriptor *desc;
int offset[AV_NUM_DATA_POINTERS];
int vshift;
const int field_pic = h->picture_structure != PICT_FRAME;
if (!avctx->draw_horiz_band)
return;
if (field_pic && h->first_field && !(avctx->slice_flags & SLICE_FLAG_ALLOW_FIELD))
return;
if (field_pic) {
height <<= 1;
y <<= 1;
}
height = FFMIN(height, avctx->height - y);
desc = av_pix_fmt_desc_get(avctx->pix_fmt);
vshift = desc->log2_chroma_h;
offset[0] = y * src->linesize[0];
offset[1] =
offset[2] = (y >> vshift) * src->linesize[1];
for (int i = 3; i < AV_NUM_DATA_POINTERS; i++)
offset[i] = 0;
emms_c();
avctx->draw_horiz_band(avctx, src, offset,
y, h->picture_structure, height);
}
void ff_h264_free_tables(H264Context *h)
{
int i;
av_freep(&h->intra4x4_pred_mode);
av_freep(&h->chroma_pred_mode_table);
av_freep(&h->cbp_table);
av_freep(&h->mvd_table[0]);
av_freep(&h->mvd_table[1]);
av_freep(&h->direct_table);
av_freep(&h->non_zero_count);
av_freep(&h->slice_table_base);
h->slice_table = NULL;
av_freep(&h->list_counts);
av_freep(&h->mb2b_xy);
av_freep(&h->mb2br_xy);
ff_refstruct_pool_uninit(&h->qscale_table_pool);
ff_refstruct_pool_uninit(&h->mb_type_pool);
ff_refstruct_pool_uninit(&h->motion_val_pool);
ff_refstruct_pool_uninit(&h->ref_index_pool);
#if CONFIG_ERROR_RESILIENCE
av_freep(&h->er.mb_index2xy);
av_freep(&h->er.error_status_table);
av_freep(&h->er.er_temp_buffer);
av_freep(&h->dc_val_base);
#endif
for (i = 0; i < h->nb_slice_ctx; i++) {
H264SliceContext *sl = &h->slice_ctx[i];
av_freep(&sl->bipred_scratchpad);
av_freep(&sl->edge_emu_buffer);
av_freep(&sl->top_borders[0]);
av_freep(&sl->top_borders[1]);
sl->bipred_scratchpad_allocated = 0;
sl->edge_emu_buffer_allocated = 0;
sl->top_borders_allocated[0] = 0;
sl->top_borders_allocated[1] = 0;
}
}
int ff_h264_alloc_tables(H264Context *h)
{
ERContext *const er = &h->er;
const int big_mb_num = h->mb_stride * (h->mb_height + 1);
const int row_mb_num = 2*h->mb_stride*FFMAX(h->nb_slice_ctx, 1);
const int st_size = big_mb_num + h->mb_stride;
int x, y;
if (!FF_ALLOCZ_TYPED_ARRAY(h->intra4x4_pred_mode, row_mb_num * 8) ||
!FF_ALLOCZ_TYPED_ARRAY(h->non_zero_count, big_mb_num) ||
!FF_ALLOCZ_TYPED_ARRAY(h->slice_table_base, st_size) ||
!FF_ALLOCZ_TYPED_ARRAY(h->cbp_table, big_mb_num) ||
!FF_ALLOCZ_TYPED_ARRAY(h->chroma_pred_mode_table, big_mb_num) ||
!FF_ALLOCZ_TYPED_ARRAY(h->mvd_table[0], row_mb_num * 8) ||
!FF_ALLOCZ_TYPED_ARRAY(h->mvd_table[1], row_mb_num * 8) ||
!FF_ALLOCZ_TYPED_ARRAY(h->direct_table, big_mb_num * 4) ||
!FF_ALLOCZ_TYPED_ARRAY(h->list_counts, big_mb_num) ||
!FF_ALLOCZ_TYPED_ARRAY(h->mb2b_xy, big_mb_num) ||
!FF_ALLOCZ_TYPED_ARRAY(h->mb2br_xy, big_mb_num))
return AVERROR(ENOMEM);
h->slice_ctx[0].intra4x4_pred_mode = h->intra4x4_pred_mode;
h->slice_ctx[0].mvd_table[0] = h->mvd_table[0];
h->slice_ctx[0].mvd_table[1] = h->mvd_table[1];
memset(h->slice_table_base, -1,
st_size * sizeof(*h->slice_table_base));
h->slice_table = h->slice_table_base + h->mb_stride * 2 + 1;
for (y = 0; y < h->mb_height; y++)
for (x = 0; x < h->mb_width; x++) {
const int mb_xy = x + y * h->mb_stride;
const int b_xy = 4 * x + 4 * y * h->b_stride;
h->mb2b_xy[mb_xy] = b_xy;
h->mb2br_xy[mb_xy] = 8 * (FMO ? mb_xy : (mb_xy % (2 * h->mb_stride)));
}
if (CONFIG_ERROR_RESILIENCE) {
const int er_size = h->mb_height * h->mb_stride * (4*sizeof(int) + 1);
int mb_array_size = h->mb_height * h->mb_stride;
int y_size = (2 * h->mb_width + 1) * (2 * h->mb_height + 1);
int yc_size = y_size + 2 * big_mb_num;
/* init ER */
er->avctx = h->avctx;
er->decode_mb = h264_er_decode_mb;
er->opaque = h;
er->quarter_sample = 1;
er->mb_num = h->mb_num;
er->mb_width = h->mb_width;
er->mb_height = h->mb_height;
er->mb_stride = h->mb_stride;
er->b8_stride = h->mb_width * 2 + 1;
// error resilience code looks cleaner with this
if (!FF_ALLOCZ_TYPED_ARRAY(er->mb_index2xy, h->mb_num + 1) ||
!FF_ALLOCZ_TYPED_ARRAY(er->error_status_table, mb_array_size) ||
!FF_ALLOCZ_TYPED_ARRAY(er->er_temp_buffer, er_size) ||
!FF_ALLOCZ_TYPED_ARRAY(h->dc_val_base, yc_size))
return AVERROR(ENOMEM); // ff_h264_free_tables will clean up for us
for (y = 0; y < h->mb_height; y++)
for (x = 0; x < h->mb_width; x++)
er->mb_index2xy[x + y * h->mb_width] = x + y * h->mb_stride;
er->mb_index2xy[h->mb_height * h->mb_width] = (h->mb_height - 1) *
h->mb_stride + h->mb_width;
er->dc_val[0] = h->dc_val_base + h->mb_width * 2 + 2;
er->dc_val[1] = h->dc_val_base + y_size + h->mb_stride + 1;
er->dc_val[2] = er->dc_val[1] + big_mb_num;
for (int i = 0; i < yc_size; i++)
h->dc_val_base[i] = 1024;
}
return 0;
}
/**
* Init slice context
*/
void ff_h264_slice_context_init(H264Context *h, H264SliceContext *sl)
{
sl->ref_cache[0][scan8[5] + 1] =
sl->ref_cache[0][scan8[7] + 1] =
sl->ref_cache[0][scan8[13] + 1] =
sl->ref_cache[1][scan8[5] + 1] =
sl->ref_cache[1][scan8[7] + 1] =
sl->ref_cache[1][scan8[13] + 1] = PART_NOT_AVAILABLE;
sl->er = &h->er;
}
static int h264_init_pic(H264Picture *pic)
{
pic->f = av_frame_alloc();
if (!pic->f)
return AVERROR(ENOMEM);
pic->f_grain = av_frame_alloc();
if (!pic->f_grain)
return AVERROR(ENOMEM);
return 0;
}
static int h264_init_context(AVCodecContext *avctx, H264Context *h)
{
int i, ret;
h->avctx = avctx;
h->cur_chroma_format_idc = -1;
h->width_from_caller = avctx->width;
h->height_from_caller = avctx->height;
h->workaround_bugs = avctx->workaround_bugs;
h->flags = avctx->flags;
h->poc.prev_poc_msb = 1 << 16;
h->recovery_frame = -1;
h->frame_recovered = 0;
h->poc.prev_frame_num = -1;
h->sei.common.frame_packing.arrangement_cancel_flag = -1;
h->sei.common.unregistered.x264_build = -1;
h->next_outputed_poc = INT_MIN;
for (i = 0; i < FF_ARRAY_ELEMS(h->last_pocs); i++)
h->last_pocs[i] = INT_MIN;
ff_h264_sei_uninit(&h->sei);
if (avctx->active_thread_type & FF_THREAD_FRAME) {
h->decode_error_flags_pool = ff_refstruct_pool_alloc(sizeof(atomic_int), 0);
if (!h->decode_error_flags_pool)
return AVERROR(ENOMEM);
}
h->nb_slice_ctx = (avctx->active_thread_type & FF_THREAD_SLICE) ? avctx->thread_count : 1;
h->slice_ctx = av_calloc(h->nb_slice_ctx, sizeof(*h->slice_ctx));
if (!h->slice_ctx) {
h->nb_slice_ctx = 0;
return AVERROR(ENOMEM);
}
for (i = 0; i < H264_MAX_PICTURE_COUNT; i++) {
if ((ret = h264_init_pic(&h->DPB[i])) < 0)
return ret;
}
if ((ret = h264_init_pic(&h->cur_pic)) < 0)
return ret;
if ((ret = h264_init_pic(&h->last_pic_for_ec)) < 0)
return ret;
for (i = 0; i < h->nb_slice_ctx; i++)
h->slice_ctx[i].h264 = h;
return 0;
}
static void h264_free_pic(H264Context *h, H264Picture *pic)
{
ff_h264_unref_picture(pic);
av_frame_free(&pic->f);
av_frame_free(&pic->f_grain);
}
static av_cold int h264_decode_end(AVCodecContext *avctx)
{
H264Context *h = avctx->priv_data;
int i;
ff_h264_remove_all_refs(h);
ff_h264_free_tables(h);
for (i = 0; i < H264_MAX_PICTURE_COUNT; i++) {
h264_free_pic(h, &h->DPB[i]);
}
memset(h->delayed_pic, 0, sizeof(h->delayed_pic));
h->cur_pic_ptr = NULL;
ff_refstruct_pool_uninit(&h->decode_error_flags_pool);
av_freep(&h->slice_ctx);
h->nb_slice_ctx = 0;
ff_h264_sei_uninit(&h->sei);
ff_h264_ps_uninit(&h->ps);
ff_h2645_packet_uninit(&h->pkt);
h264_free_pic(h, &h->cur_pic);
h264_free_pic(h, &h->last_pic_for_ec);
return 0;
}
static AVOnce h264_vlc_init = AV_ONCE_INIT;
static av_cold int h264_decode_init(AVCodecContext *avctx)
{
H264Context *h = avctx->priv_data;
int ret;
ret = h264_init_context(avctx, h);
if (ret < 0)
return ret;
ret = ff_thread_once(&h264_vlc_init, ff_h264_decode_init_vlc);
if (ret != 0) {
av_log(avctx, AV_LOG_ERROR, "pthread_once has failed.");
return AVERROR_UNKNOWN;
}
#if FF_API_TICKS_PER_FRAME
FF_DISABLE_DEPRECATION_WARNINGS
avctx->ticks_per_frame = 2;
FF_ENABLE_DEPRECATION_WARNINGS
#endif
if (!avctx->internal->is_copy) {
if (avctx->extradata_size > 0 && avctx->extradata) {
ret = ff_h264_decode_extradata(avctx->extradata, avctx->extradata_size,
&h->ps, &h->is_avc, &h->nal_length_size,
avctx->err_recognition, avctx);
if (ret < 0) {
int explode = avctx->err_recognition & AV_EF_EXPLODE;
av_log(avctx, explode ? AV_LOG_ERROR: AV_LOG_WARNING,
"Error decoding the extradata\n");
if (explode) {
return ret;
}
ret = 0;
}
}
}
if (h->ps.sps && h->ps.sps->bitstream_restriction_flag &&
h->avctx->has_b_frames < h->ps.sps->num_reorder_frames) {
h->avctx->has_b_frames = h->ps.sps->num_reorder_frames;
}
ff_h264_flush_change(h);
if (h->enable_er < 0 && (avctx->active_thread_type & FF_THREAD_SLICE))
h->enable_er = 0;
if (h->enable_er && (avctx->active_thread_type & FF_THREAD_SLICE)) {
av_log(avctx, AV_LOG_WARNING,
"Error resilience with slice threads is enabled. It is unsafe and unsupported and may crash. "
"Use it at your own risk\n");
}
return 0;
}
/**
* instantaneous decoder refresh.
*/
static void idr(H264Context *h)
{
int i;
ff_h264_remove_all_refs(h);
h->poc.prev_frame_num =
h->poc.prev_frame_num_offset = 0;
h->poc.prev_poc_msb = 1<<16;
h->poc.prev_poc_lsb = -1;
for (i = 0; i < FF_ARRAY_ELEMS(h->last_pocs); i++)
h->last_pocs[i] = INT_MIN;
}
/* forget old pics after a seek */
void ff_h264_flush_change(H264Context *h)
{
int i, j;
h->next_outputed_poc = INT_MIN;
h->prev_interlaced_frame = 1;
idr(h);
h->poc.prev_frame_num = -1;
if (h->cur_pic_ptr) {
h->cur_pic_ptr->reference = 0;
for (j=i=0; h->delayed_pic[i]; i++)
if (h->delayed_pic[i] != h->cur_pic_ptr)
h->delayed_pic[j++] = h->delayed_pic[i];
h->delayed_pic[j] = NULL;
}
ff_h264_unref_picture(&h->last_pic_for_ec);
h->first_field = 0;
h->recovery_frame = -1;
h->frame_recovered = 0;
h->current_slice = 0;
h->mmco_reset = 1;
}
static void h264_decode_flush(AVCodecContext *avctx)
{
H264Context *h = avctx->priv_data;
int i;
memset(h->delayed_pic, 0, sizeof(h->delayed_pic));
ff_h264_flush_change(h);
ff_h264_sei_uninit(&h->sei);
for (i = 0; i < H264_MAX_PICTURE_COUNT; i++)
ff_h264_unref_picture(&h->DPB[i]);
h->cur_pic_ptr = NULL;
ff_h264_unref_picture(&h->cur_pic);
h->mb_y = 0;
h->non_gray = 0;
ff_h264_free_tables(h);
h->context_initialized = 0;
if (FF_HW_HAS_CB(avctx, flush))
FF_HW_SIMPLE_CALL(avctx, flush);
}
static int get_last_needed_nal(H264Context *h)
{
int nals_needed = 0;
int slice_type = 0;
int picture_intra_only = 1;
int first_slice = 0;
int i, ret;
for (i = 0; i < h->pkt.nb_nals; i++) {
H2645NAL *nal = &h->pkt.nals[i];
GetBitContext gb;
/* packets can sometimes contain multiple PPS/SPS,
* e.g. two PAFF field pictures in one packet, or a demuxer
* which splits NALs strangely if so, when frame threading we
* can't start the next thread until we've read all of them */
switch (nal->type) {
case H264_NAL_SPS:
case H264_NAL_PPS:
nals_needed = i;
break;
case H264_NAL_DPA:
case H264_NAL_IDR_SLICE:
case H264_NAL_SLICE:
ret = init_get_bits8(&gb, nal->data + 1, nal->size - 1);
if (ret < 0) {
av_log(h->avctx, AV_LOG_ERROR, "Invalid zero-sized VCL NAL unit\n");
if (h->avctx->err_recognition & AV_EF_EXPLODE)
return ret;
break;
}
if (!get_ue_golomb_long(&gb) || // first_mb_in_slice
!first_slice ||
first_slice != nal->type)
nals_needed = i;
slice_type = get_ue_golomb_31(&gb);
if (slice_type > 9)
slice_type = 0;
if (slice_type > 4)
slice_type -= 5;
slice_type = ff_h264_golomb_to_pict_type[slice_type];
picture_intra_only &= (slice_type & 3) == AV_PICTURE_TYPE_I;
if (!first_slice)
first_slice = nal->type;
}
}
h->picture_intra_only = picture_intra_only;
return nals_needed;
}
static void debug_green_metadata(const H264SEIGreenMetaData *gm, void *logctx)
{
av_log(logctx, AV_LOG_DEBUG, "Green Metadata Info SEI message\n");
av_log(logctx, AV_LOG_DEBUG, " green_metadata_type: %d\n", gm->green_metadata_type);
if (gm->green_metadata_type == 0) {
av_log(logctx, AV_LOG_DEBUG, " green_metadata_period_type: %d\n", gm->period_type);
if (gm->period_type == 2)
av_log(logctx, AV_LOG_DEBUG, " green_metadata_num_seconds: %d\n", gm->num_seconds);
else if (gm->period_type == 3)
av_log(logctx, AV_LOG_DEBUG, " green_metadata_num_pictures: %d\n", gm->num_pictures);
av_log(logctx, AV_LOG_DEBUG, " SEI GREEN Complexity Metrics: %f %f %f %f\n",
(float)gm->percent_non_zero_macroblocks/255,
(float)gm->percent_intra_coded_macroblocks/255,
(float)gm->percent_six_tap_filtering/255,
(float)gm->percent_alpha_point_deblocking_instance/255);
} else if (gm->green_metadata_type == 1) {
av_log(logctx, AV_LOG_DEBUG, " xsd_metric_type: %d\n", gm->xsd_metric_type);
if (gm->xsd_metric_type == 0)
av_log(logctx, AV_LOG_DEBUG, " xsd_metric_value: %f\n",
(float)gm->xsd_metric_value/100);
}
}
static int decode_nal_units(H264Context *h, const uint8_t *buf, int buf_size)
{
AVCodecContext *const avctx = h->avctx;
int nals_needed = 0; ///< number of NALs that need decoding before the next frame thread starts
int idr_cleared=0;
int i, ret = 0;
h->has_slice = 0;
h->nal_unit_type= 0;
if (!(avctx->flags2 & AV_CODEC_FLAG2_CHUNKS)) {
h->current_slice = 0;
if (!h->first_field) {
h->cur_pic_ptr = NULL;
ff_h264_sei_uninit(&h->sei);
}
}
if (h->nal_length_size == 4) {
if (buf_size > 8 && AV_RB32(buf) == 1 && AV_RB32(buf+5) > (unsigned)buf_size) {
h->is_avc = 0;
}else if(buf_size > 3 && AV_RB32(buf) > 1 && AV_RB32(buf) <= (unsigned)buf_size)
h->is_avc = 1;
}
ret = ff_h2645_packet_split(&h->pkt, buf, buf_size, avctx, h->nal_length_size,
avctx->codec_id, !!h->is_avc * H2645_FLAG_IS_NALFF);
if (ret < 0) {
av_log(avctx, AV_LOG_ERROR,
"Error splitting the input into NAL units.\n");
return ret;
}
if (avctx->active_thread_type & FF_THREAD_FRAME)
nals_needed = get_last_needed_nal(h);
if (nals_needed < 0)
return nals_needed;
for (i = 0; i < h->pkt.nb_nals; i++) {
H2645NAL *nal = &h->pkt.nals[i];
int max_slice_ctx, err;
if (avctx->skip_frame >= AVDISCARD_NONREF &&
nal->ref_idc == 0 && nal->type != H264_NAL_SEI)
continue;
// FIXME these should stop being context-global variables
h->nal_ref_idc = nal->ref_idc;
h->nal_unit_type = nal->type;
err = 0;
switch (nal->type) {
case H264_NAL_IDR_SLICE:
if ((nal->data[1] & 0xFC) == 0x98) {
av_log(h->avctx, AV_LOG_ERROR, "Invalid inter IDR frame\n");
h->next_outputed_poc = INT_MIN;
ret = -1;
goto end;
}
if(!idr_cleared) {
idr(h); // FIXME ensure we don't lose some frames if there is reordering
}
idr_cleared = 1;
h->has_recovery_point = 1;
case H264_NAL_SLICE:
h->has_slice = 1;
if ((err = ff_h264_queue_decode_slice(h, nal))) {
H264SliceContext *sl = h->slice_ctx + h->nb_slice_ctx_queued;
sl->ref_count[0] = sl->ref_count[1] = 0;
break;
}
if (h->current_slice == 1) {
if (avctx->active_thread_type & FF_THREAD_FRAME &&
i >= nals_needed && !h->setup_finished && h->cur_pic_ptr) {
ff_thread_finish_setup(avctx);
h->setup_finished = 1;
}
if (h->avctx->hwaccel &&
(ret = FF_HW_CALL(h->avctx, start_frame, buf, buf_size)) < 0)
goto end;
}
max_slice_ctx = avctx->hwaccel ? 1 : h->nb_slice_ctx;
if (h->nb_slice_ctx_queued == max_slice_ctx) {
if (h->avctx->hwaccel) {
ret = FF_HW_CALL(avctx, decode_slice, nal->raw_data, nal->raw_size);
h->nb_slice_ctx_queued = 0;
} else
ret = ff_h264_execute_decode_slices(h);
if (ret < 0 && (h->avctx->err_recognition & AV_EF_EXPLODE))
goto end;
}
break;
case H264_NAL_DPA:
case H264_NAL_DPB:
case H264_NAL_DPC:
avpriv_request_sample(avctx, "data partitioning");
break;
case H264_NAL_SEI:
if (h->setup_finished) {
avpriv_request_sample(avctx, "Late SEI");
break;
}
ret = ff_h264_sei_decode(&h->sei, &nal->gb, &h->ps, avctx);
h->has_recovery_point = h->has_recovery_point || h->sei.recovery_point.recovery_frame_cnt != -1;
if (avctx->debug & FF_DEBUG_GREEN_MD)
debug_green_metadata(&h->sei.green_metadata, h->avctx);
if (ret < 0 && (h->avctx->err_recognition & AV_EF_EXPLODE))
goto end;
break;
case H264_NAL_SPS: {
GetBitContext tmp_gb = nal->gb;
if (FF_HW_HAS_CB(avctx, decode_params)) {
ret = FF_HW_CALL(avctx, decode_params,
nal->type, nal->raw_data, nal->raw_size);
if (ret < 0)
goto end;
}
if (ff_h264_decode_seq_parameter_set(&tmp_gb, avctx, &h->ps, 0) >= 0)
break;
av_log(h->avctx, AV_LOG_DEBUG,
"SPS decoding failure, trying again with the complete NAL\n");
init_get_bits8(&tmp_gb, nal->raw_data + 1, nal->raw_size - 1);
if (ff_h264_decode_seq_parameter_set(&tmp_gb, avctx, &h->ps, 0) >= 0)
break;
ff_h264_decode_seq_parameter_set(&nal->gb, avctx, &h->ps, 1);
break;
}
case H264_NAL_PPS:
if (FF_HW_HAS_CB(avctx, decode_params)) {
ret = FF_HW_CALL(avctx, decode_params,
nal->type, nal->raw_data, nal->raw_size);
if (ret < 0)
goto end;
}
ret = ff_h264_decode_picture_parameter_set(&nal->gb, avctx, &h->ps,
nal->size_bits);
if (ret < 0 && (h->avctx->err_recognition & AV_EF_EXPLODE))
goto end;
break;
case H264_NAL_AUD:
case H264_NAL_END_SEQUENCE:
case H264_NAL_END_STREAM:
case H264_NAL_FILLER_DATA:
case H264_NAL_SPS_EXT:
case H264_NAL_AUXILIARY_SLICE:
break;
default:
av_log(avctx, AV_LOG_DEBUG, "Unknown NAL code: %d (%d bits)\n",
nal->type, nal->size_bits);
}
if (err < 0) {
av_log(h->avctx, AV_LOG_ERROR, "decode_slice_header error\n");
}
}
ret = ff_h264_execute_decode_slices(h);
if (ret < 0 && (h->avctx->err_recognition & AV_EF_EXPLODE))
goto end;
// set decode_error_flags to allow users to detect concealed decoding errors
if ((ret < 0 || h->er.error_occurred) && h->cur_pic_ptr) {
if (h->cur_pic_ptr->decode_error_flags) {
/* Frame-threading in use */
atomic_int *decode_error = h->cur_pic_ptr->decode_error_flags;
/* Using atomics here is not supposed to provide syncronisation;
* they are merely used to allow to set decode_error from both
* decoding threads in case of coded slices. */
atomic_fetch_or_explicit(decode_error, FF_DECODE_ERROR_DECODE_SLICES,
memory_order_relaxed);
} else
h->cur_pic_ptr->f->decode_error_flags |= FF_DECODE_ERROR_DECODE_SLICES;
}
ret = 0;
end:
#if CONFIG_ERROR_RESILIENCE
/*
* FIXME: Error handling code does not seem to support interlaced
* when slices span multiple rows
* The ff_er_add_slice calls don't work right for bottom
* fields; they cause massive erroneous error concealing
* Error marking covers both fields (top and bottom).
* This causes a mismatched s->error_count
* and a bad error table. Further, the error count goes to
* INT_MAX when called for bottom field, because mb_y is
* past end by one (callers fault) and resync_mb_y != 0
* causes problems for the first MB line, too.
*/
if (!FIELD_PICTURE(h) && h->current_slice && h->enable_er) {
H264SliceContext *sl = h->slice_ctx;
int use_last_pic = h->last_pic_for_ec.f->buf[0] && !sl->ref_count[0];
int decode_error_flags = 0;
ff_h264_set_erpic(&h->er.cur_pic, h->cur_pic_ptr);
if (use_last_pic) {
ff_h264_set_erpic(&h->er.last_pic, &h->last_pic_for_ec);
sl->ref_list[0][0].parent = &h->last_pic_for_ec;
memcpy(sl->ref_list[0][0].data, h->last_pic_for_ec.f->data, sizeof(sl->ref_list[0][0].data));
memcpy(sl->ref_list[0][0].linesize, h->last_pic_for_ec.f->linesize, sizeof(sl->ref_list[0][0].linesize));
sl->ref_list[0][0].reference = h->last_pic_for_ec.reference;
} else if (sl->ref_count[0]) {
ff_h264_set_erpic(&h->er.last_pic, sl->ref_list[0][0].parent);
} else
ff_h264_set_erpic(&h->er.last_pic, NULL);
if (sl->ref_count[1])
ff_h264_set_erpic(&h->er.next_pic, sl->ref_list[1][0].parent);
ff_er_frame_end(&h->er, &decode_error_flags);
if (decode_error_flags) {
if (h->cur_pic_ptr->decode_error_flags) {
atomic_int *decode_error = h->cur_pic_ptr->decode_error_flags;
atomic_fetch_or_explicit(decode_error, decode_error_flags,
memory_order_relaxed);
} else
h->cur_pic_ptr->f->decode_error_flags |= decode_error_flags;
}
if (use_last_pic)
memset(&sl->ref_list[0][0], 0, sizeof(sl->ref_list[0][0]));
}
#endif /* CONFIG_ERROR_RESILIENCE */
/* clean up */
if (h->cur_pic_ptr && !h->droppable && h->has_slice) {
ff_thread_report_progress(&h->cur_pic_ptr->tf, INT_MAX,
h->picture_structure == PICT_BOTTOM_FIELD);
}
return (ret < 0) ? ret : buf_size;
}
/**
* Return the number of bytes consumed for building the current frame.
*/
static int get_consumed_bytes(int pos, int buf_size)
{
if (pos == 0)
pos = 1; // avoid infinite loops (I doubt that is needed but...)
if (pos + 10 > buf_size)
pos = buf_size; // oops ;)
return pos;
}
static int h264_export_enc_params(AVFrame *f, const H264Picture *p)
{
AVVideoEncParams *par;
unsigned int nb_mb = p->mb_height * p->mb_width;
unsigned int x, y;
par = av_video_enc_params_create_side_data(f, AV_VIDEO_ENC_PARAMS_H264, nb_mb);
if (!par)
return AVERROR(ENOMEM);
par->qp = p->pps->init_qp;
par->delta_qp[1][0] = p->pps->chroma_qp_index_offset[0];
par->delta_qp[1][1] = p->pps->chroma_qp_index_offset[0];
par->delta_qp[2][0] = p->pps->chroma_qp_index_offset[1];
par->delta_qp[2][1] = p->pps->chroma_qp_index_offset[1];
for (y = 0; y < p->mb_height; y++)
for (x = 0; x < p->mb_width; x++) {
const unsigned int block_idx = y * p->mb_width + x;
const unsigned int mb_xy = y * p->mb_stride + x;
AVVideoBlockParams *b = av_video_enc_params_block(par, block_idx);
b->src_x = x * 16;
b->src_y = y * 16;
b->w = 16;
b->h = 16;
b->delta_qp = p->qscale_table[mb_xy] - par->qp;
}
return 0;
}
static int output_frame(H264Context *h, AVFrame *dst, H264Picture *srcp)
{
int ret;
ret = av_frame_ref(dst, srcp->needs_fg ? srcp->f_grain : srcp->f);
if (ret < 0)
return ret;
if (srcp->needs_fg && (ret = av_frame_copy_props(dst, srcp->f)) < 0)
return ret;
if (srcp->decode_error_flags) {
atomic_int *decode_error = srcp->decode_error_flags;
/* The following is not supposed to provide synchronisation at all:
* given that srcp has already finished decoding, decode_error
* has already been set to its final value. */
dst->decode_error_flags |= atomic_load_explicit(decode_error, memory_order_relaxed);
}
av_dict_set(&dst->metadata, "stereo_mode", ff_h264_sei_stereo_mode(&h->sei.common.frame_packing), 0);
if (srcp->sei_recovery_frame_cnt == 0)
dst->flags |= AV_FRAME_FLAG_KEY;
if (h->avctx->export_side_data & AV_CODEC_EXPORT_DATA_VIDEO_ENC_PARAMS) {
ret = h264_export_enc_params(dst, srcp);
if (ret < 0)
goto fail;
}
if (!(h->avctx->export_side_data & AV_CODEC_EXPORT_DATA_FILM_GRAIN))
av_frame_remove_side_data(dst, AV_FRAME_DATA_FILM_GRAIN_PARAMS);
return 0;
fail:
av_frame_unref(dst);
return ret;
}
static int is_avcc_extradata(const uint8_t *buf, int buf_size)
{
int cnt= buf[5]&0x1f;
const uint8_t *p= buf+6;
if (!cnt)
return 0;
while(cnt--){
int nalsize= AV_RB16(p) + 2;
if(nalsize > buf_size - (p-buf) || (p[2] & 0x9F) != 7)
return 0;
p += nalsize;
}
cnt = *(p++);
if(!cnt)
return 0;
while(cnt--){
int nalsize= AV_RB16(p) + 2;
if(nalsize > buf_size - (p-buf) || (p[2] & 0x9F) != 8)
return 0;
p += nalsize;
}
return 1;
}
static int finalize_frame(H264Context *h, AVFrame *dst, H264Picture *out, int *got_frame)
{
int ret;
if (((h->avctx->flags & AV_CODEC_FLAG_OUTPUT_CORRUPT) ||
(h->avctx->flags2 & AV_CODEC_FLAG2_SHOW_ALL) ||
out->recovered)) {
if (h->skip_gray > 0 &&
h->non_gray && out->gray &&
!(h->avctx->flags2 & AV_CODEC_FLAG2_SHOW_ALL)
)
return 0;
if (!h->avctx->hwaccel &&
(out->field_poc[0] == INT_MAX ||
out->field_poc[1] == INT_MAX)
) {
int p;
AVFrame *f = out->f;
int field = out->field_poc[0] == INT_MAX;
uint8_t *dst_data[4];
int linesizes[4];
const uint8_t *src_data[4];
av_log(h->avctx, AV_LOG_DEBUG, "Duplicating field %d to fill missing\n", field);
for (p = 0; p<4; p++) {
dst_data[p] = f->data[p] + (field^1)*f->linesize[p];
src_data[p] = f->data[p] + field *f->linesize[p];
linesizes[p] = 2*f->linesize[p];
}
av_image_copy(dst_data, linesizes, src_data, linesizes,
f->format, f->width, f->height>>1);
}
ret = output_frame(h, dst, out);
if (ret < 0)
return ret;
*got_frame = 1;
if (CONFIG_MPEGVIDEODEC) {
ff_print_debug_info2(h->avctx, dst,
out->mb_type,
out->qscale_table,
out->motion_val,
out->mb_width, out->mb_height, out->mb_stride, 1);
}
}
return 0;
}
static int send_next_delayed_frame(H264Context *h, AVFrame *dst_frame,
int *got_frame, int buf_index)
{
int ret, i, out_idx;
H264Picture *out;
h->cur_pic_ptr = NULL;
h->first_field = 0;
while (h->delayed_pic[0]) {
out = h->delayed_pic[0];
out_idx = 0;
for (i = 1;
h->delayed_pic[i] &&
!(h->delayed_pic[i]->f->flags & AV_FRAME_FLAG_KEY) &&
!h->delayed_pic[i]->mmco_reset;
i++)
if (h->delayed_pic[i]->poc < out->poc) {
out = h->delayed_pic[i];
out_idx = i;
}
for (i = out_idx; h->delayed_pic[i]; i++)
h->delayed_pic[i] = h->delayed_pic[i + 1];
if (out) {
h->frame_recovered |= out->recovered;
out->recovered |= h->frame_recovered & FRAME_RECOVERED_SEI;
out->reference &= ~DELAYED_PIC_REF;
ret = finalize_frame(h, dst_frame, out, got_frame);
if (ret < 0)
return ret;
if (*got_frame)
break;
}
}
return buf_index;
}
static int h264_decode_frame(AVCodecContext *avctx, AVFrame *pict,
int *got_frame, AVPacket *avpkt)
{
const uint8_t *buf = avpkt->data;
int buf_size = avpkt->size;
H264Context *h = avctx->priv_data;
int buf_index;
int ret;
h->flags = avctx->flags;
h->setup_finished = 0;
h->nb_slice_ctx_queued = 0;
ff_h264_unref_picture(&h->last_pic_for_ec);
/* end of stream, output what is still in the buffers */
if (buf_size == 0)
return send_next_delayed_frame(h, pict, got_frame, 0);
if (av_packet_get_side_data(avpkt, AV_PKT_DATA_NEW_EXTRADATA, NULL)) {
size_t side_size;
uint8_t *side = av_packet_get_side_data(avpkt, AV_PKT_DATA_NEW_EXTRADATA, &side_size);
ff_h264_decode_extradata(side, side_size,
&h->ps, &h->is_avc, &h->nal_length_size,
avctx->err_recognition, avctx);
}
if (h->is_avc && buf_size >= 9 && buf[0]==1 && buf[2]==0 && (buf[4]&0xFC)==0xFC) {
if (is_avcc_extradata(buf, buf_size))
return ff_h264_decode_extradata(buf, buf_size,
&h->ps, &h->is_avc, &h->nal_length_size,
avctx->err_recognition, avctx);
}
buf_index = decode_nal_units(h, buf, buf_size);
if (buf_index < 0)
return AVERROR_INVALIDDATA;
if (!h->cur_pic_ptr && h->nal_unit_type == H264_NAL_END_SEQUENCE) {
av_assert0(buf_index <= buf_size);
return send_next_delayed_frame(h, pict, got_frame, buf_index);
}
if (!(avctx->flags2 & AV_CODEC_FLAG2_CHUNKS) && (!h->cur_pic_ptr || !h->has_slice)) {
if (avctx->skip_frame >= AVDISCARD_NONREF ||
buf_size >= 4 && !memcmp("Q264", buf, 4))
return buf_size;
av_log(avctx, AV_LOG_ERROR, "no frame!\n");
return AVERROR_INVALIDDATA;
}
if (!(avctx->flags2 & AV_CODEC_FLAG2_CHUNKS) ||
(h->mb_y >= h->mb_height && h->mb_height)) {
if ((ret = ff_h264_field_end(h, &h->slice_ctx[0], 0)) < 0)
return ret;
/* Wait for second field. */
if (h->next_output_pic) {
ret = finalize_frame(h, pict, h->next_output_pic, got_frame);
if (ret < 0)
return ret;
}
}
av_assert0(pict->buf[0] || !*got_frame);
ff_h264_unref_picture(&h->last_pic_for_ec);
return get_consumed_bytes(buf_index, buf_size);
}
#define OFFSET(x) offsetof(H264Context, x)
#define VD AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_DECODING_PARAM
#define VDX VD | AV_OPT_FLAG_EXPORT
static const AVOption h264_options[] = {
{ "is_avc", "is avc", OFFSET(is_avc), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, VDX },
{ "nal_length_size", "nal_length_size", OFFSET(nal_length_size), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 4, VDX },
{ "enable_er", "Enable error resilience on damaged frames (unsafe)", OFFSET(enable_er), AV_OPT_TYPE_BOOL, { .i64 = -1 }, -1, 1, VD },
{ "x264_build", "Assume this x264 version if no x264 version found in any SEI", OFFSET(x264_build), AV_OPT_TYPE_INT, {.i64 = -1}, -1, INT_MAX, VD },
{ "skip_gray", "Do not return gray gap frames", OFFSET(skip_gray), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, VD },
{ "noref_gray", "Avoid using gray gap frames as references", OFFSET(noref_gray), AV_OPT_TYPE_BOOL, {.i64 = 1}, 0, 1, VD },
{ NULL },
};
static const AVClass h264_class = {
.class_name = "H264 Decoder",
.item_name = av_default_item_name,
.option = h264_options,
.version = LIBAVUTIL_VERSION_INT,
};
const FFCodec ff_h264_decoder = {
.p.name = "h264",
CODEC_LONG_NAME("H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10"),
.p.type = AVMEDIA_TYPE_VIDEO,
.p.id = AV_CODEC_ID_H264,
.priv_data_size = sizeof(H264Context),
.init = h264_decode_init,
.close = h264_decode_end,
FF_CODEC_DECODE_CB(h264_decode_frame),
.p.capabilities = AV_CODEC_CAP_DR1 |
AV_CODEC_CAP_DELAY | AV_CODEC_CAP_SLICE_THREADS |
AV_CODEC_CAP_FRAME_THREADS,
.hw_configs = (const AVCodecHWConfigInternal *const []) {
#if CONFIG_H264_DXVA2_HWACCEL
HWACCEL_DXVA2(h264),
#endif
#if CONFIG_H264_D3D11VA_HWACCEL
HWACCEL_D3D11VA(h264),
#endif
#if CONFIG_H264_D3D11VA2_HWACCEL
HWACCEL_D3D11VA2(h264),
#endif
#if CONFIG_H264_D3D12VA_HWACCEL
HWACCEL_D3D12VA(h264),
#endif
#if CONFIG_H264_NVDEC_HWACCEL
HWACCEL_NVDEC(h264),
#endif
#if CONFIG_H264_VAAPI_HWACCEL
HWACCEL_VAAPI(h264),
#endif
#if CONFIG_H264_VDPAU_HWACCEL
HWACCEL_VDPAU(h264),
#endif
#if CONFIG_H264_VIDEOTOOLBOX_HWACCEL
HWACCEL_VIDEOTOOLBOX(h264),
#endif
#if CONFIG_H264_VULKAN_HWACCEL
HWACCEL_VULKAN(h264),
#endif
NULL
},
.caps_internal = FF_CODEC_CAP_EXPORTS_CROPPING |
FF_CODEC_CAP_INIT_CLEANUP,
.flush = h264_decode_flush,
UPDATE_THREAD_CONTEXT(ff_h264_update_thread_context),
UPDATE_THREAD_CONTEXT_FOR_USER(ff_h264_update_thread_context_for_user),
.p.profiles = NULL_IF_CONFIG_SMALL(ff_h264_profiles),
.p.priv_class = &h264_class,
};