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FFmpeg/libavcodec/h264.c
Anton Khirnov bd737b5178 h264: reset the private data in init_thread_copy() 
The generic code copies the main context's private data to all the
others. However that is quite dangerous, as it might end up copying some
pointers that are or will become invalid.

Since everything we actually need will be copied later in
update_thread_context(), it's safest to zero the private data in
init_thread_copy(), so it works the same way as init for the main
context.
2015-04-05 12:03:07 +02:00

1832 lines
61 KiB
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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 Libav.
*
* 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.
*
* 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 Libav; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* @file
* H.264 / AVC / MPEG4 part10 codec.
* @author Michael Niedermayer <michaelni@gmx.at>
*/
#include "libavutil/avassert.h"
#include "libavutil/display.h"
#include "libavutil/imgutils.h"
#include "libavutil/opt.h"
#include "libavutil/stereo3d.h"
#include "libavutil/timer.h"
#include "internal.h"
#include "cabac.h"
#include "cabac_functions.h"
#include "error_resilience.h"
#include "avcodec.h"
#include "h264.h"
#include "h264data.h"
#include "h264chroma.h"
#include "h264_mvpred.h"
#include "golomb.h"
#include "mathops.h"
#include "me_cmp.h"
#include "mpegutils.h"
#include "rectangle.h"
#include "svq3.h"
#include "thread.h"
#include <assert.h>
const uint16_t ff_h264_mb_sizes[4] = { 256, 384, 512, 768 };
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)
{
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));
assert(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;
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);
assert(!FRAME_MBAFF(h));
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 = av_pix_fmt_desc_get(avctx->pix_fmt);
int vshift = desc->log2_chroma_h;
const int field_pic = h->picture_structure != PICT_FRAME;
if (field_pic) {
height <<= 1;
y <<= 1;
}
height = FFMIN(height, avctx->height - y);
if (field_pic && h->first_field && !(avctx->slice_flags & SLICE_FLAG_ALLOW_FIELD))
return;
if (avctx->draw_horiz_band) {
int offset[AV_NUM_DATA_POINTERS];
int i;
offset[0] = y * src->linesize[0];
offset[1] =
offset[2] = (y >> vshift) * src->linesize[1];
for (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);
}
}
/**
* Check if the top & left blocks are available if needed and
* change the dc mode so it only uses the available blocks.
*/
int ff_h264_check_intra4x4_pred_mode(const H264Context *h, H264SliceContext *sl)
{
static const int8_t top[12] = {
-1, 0, LEFT_DC_PRED, -1, -1, -1, -1, -1, 0
};
static const int8_t left[12] = {
0, -1, TOP_DC_PRED, 0, -1, -1, -1, 0, -1, DC_128_PRED
};
int i;
if (!(sl->top_samples_available & 0x8000)) {
for (i = 0; i < 4; i++) {
int status = top[sl->intra4x4_pred_mode_cache[scan8[0] + i]];
if (status < 0) {
av_log(h->avctx, AV_LOG_ERROR,
"top block unavailable for requested intra4x4 mode %d at %d %d\n",
status, sl->mb_x, sl->mb_y);
return AVERROR_INVALIDDATA;
} else if (status) {
sl->intra4x4_pred_mode_cache[scan8[0] + i] = status;
}
}
}
if ((sl->left_samples_available & 0x8888) != 0x8888) {
static const int mask[4] = { 0x8000, 0x2000, 0x80, 0x20 };
for (i = 0; i < 4; i++)
if (!(sl->left_samples_available & mask[i])) {
int status = left[sl->intra4x4_pred_mode_cache[scan8[0] + 8 * i]];
if (status < 0) {
av_log(h->avctx, AV_LOG_ERROR,
"left block unavailable for requested intra4x4 mode %d at %d %d\n",
status, sl->mb_x, sl->mb_y);
return AVERROR_INVALIDDATA;
} else if (status) {
sl->intra4x4_pred_mode_cache[scan8[0] + 8 * i] = status;
}
}
}
return 0;
} // FIXME cleanup like ff_h264_check_intra_pred_mode
/**
* Check if the top & left blocks are available if needed and
* change the dc mode so it only uses the available blocks.
*/
int ff_h264_check_intra_pred_mode(const H264Context *h, H264SliceContext *sl,
int mode, int is_chroma)
{
static const int8_t top[4] = { LEFT_DC_PRED8x8, 1, -1, -1 };
static const int8_t left[5] = { TOP_DC_PRED8x8, -1, 2, -1, DC_128_PRED8x8 };
if (mode > 3U) {
av_log(h->avctx, AV_LOG_ERROR,
"out of range intra chroma pred mode at %d %d\n",
sl->mb_x, sl->mb_y);
return AVERROR_INVALIDDATA;
}
if (!(sl->top_samples_available & 0x8000)) {
mode = top[mode];
if (mode < 0) {
av_log(h->avctx, AV_LOG_ERROR,
"top block unavailable for requested intra mode at %d %d\n",
sl->mb_x, sl->mb_y);
return AVERROR_INVALIDDATA;
}
}
if ((sl->left_samples_available & 0x8080) != 0x8080) {
mode = left[mode];
if (is_chroma && (sl->left_samples_available & 0x8080)) {
// mad cow disease mode, aka MBAFF + constrained_intra_pred
mode = ALZHEIMER_DC_L0T_PRED8x8 +
(!(sl->left_samples_available & 0x8000)) +
2 * (mode == DC_128_PRED8x8);
}
if (mode < 0) {
av_log(h->avctx, AV_LOG_ERROR,
"left block unavailable for requested intra mode at %d %d\n",
sl->mb_x, sl->mb_y);
return AVERROR_INVALIDDATA;
}
}
return mode;
}
const uint8_t *ff_h264_decode_nal(H264Context *h, H264SliceContext *sl,
const uint8_t *src,
int *dst_length, int *consumed, int length)
{
int i, si, di;
uint8_t *dst;
// src[0]&0x80; // forbidden bit
h->nal_ref_idc = src[0] >> 5;
h->nal_unit_type = src[0] & 0x1F;
src++;
length--;
#define STARTCODE_TEST \
if (i + 2 < length && src[i + 1] == 0 && src[i + 2] <= 3) { \
if (src[i + 2] != 3) { \
/* startcode, so we must be past the end */ \
length = i; \
} \
break; \
}
#if HAVE_FAST_UNALIGNED
#define FIND_FIRST_ZERO \
if (i > 0 && !src[i]) \
i--; \
while (src[i]) \
i++
#if HAVE_FAST_64BIT
for (i = 0; i + 1 < length; i += 9) {
if (!((~AV_RN64A(src + i) &
(AV_RN64A(src + i) - 0x0100010001000101ULL)) &
0x8000800080008080ULL))
continue;
FIND_FIRST_ZERO;
STARTCODE_TEST;
i -= 7;
}
#else
for (i = 0; i + 1 < length; i += 5) {
if (!((~AV_RN32A(src + i) &
(AV_RN32A(src + i) - 0x01000101U)) &
0x80008080U))
continue;
FIND_FIRST_ZERO;
STARTCODE_TEST;
i -= 3;
}
#endif
#else
for (i = 0; i + 1 < length; i += 2) {
if (src[i])
continue;
if (i > 0 && src[i - 1] == 0)
i--;
STARTCODE_TEST;
}
#endif
if (i >= length - 1) { // no escaped 0
*dst_length = length;
*consumed = length + 1; // +1 for the header
return src;
}
av_fast_malloc(&sl->rbsp_buffer, &sl->rbsp_buffer_size,
length + FF_INPUT_BUFFER_PADDING_SIZE);
dst = sl->rbsp_buffer;
if (!dst)
return NULL;
memcpy(dst, src, i);
si = di = i;
while (si + 2 < length) {
// remove escapes (very rare 1:2^22)
if (src[si + 2] > 3) {
dst[di++] = src[si++];
dst[di++] = src[si++];
} else if (src[si] == 0 && src[si + 1] == 0) {
if (src[si + 2] == 3) { // escape
dst[di++] = 0;
dst[di++] = 0;
si += 3;
continue;
} else // next start code
goto nsc;
}
dst[di++] = src[si++];
}
while (si < length)
dst[di++] = src[si++];
nsc:
memset(dst + di, 0, FF_INPUT_BUFFER_PADDING_SIZE);
*dst_length = di;
*consumed = si + 1; // +1 for the header
/* FIXME store exact number of bits in the getbitcontext
* (it is needed for decoding) */
return dst;
}
/**
* Identify the exact end of the bitstream
* @return the length of the trailing, or 0 if damaged
*/
static int decode_rbsp_trailing(H264Context *h, const uint8_t *src)
{
int v = *src;
int r;
tprintf(h->avctx, "rbsp trailing %X\n", v);
for (r = 1; r < 9; r++) {
if (v & 1)
return r;
v >>= 1;
}
return 0;
}
void ff_h264_free_tables(H264Context *h, int free_rbsp)
{
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);
av_buffer_pool_uninit(&h->qscale_table_pool);
av_buffer_pool_uninit(&h->mb_type_pool);
av_buffer_pool_uninit(&h->motion_val_pool);
av_buffer_pool_uninit(&h->ref_index_pool);
if (free_rbsp && h->DPB) {
for (i = 0; i < H264_MAX_PICTURE_COUNT; i++)
ff_h264_unref_picture(h, &h->DPB[i]);
av_freep(&h->DPB);
} else if (h->DPB) {
for (i = 0; i < H264_MAX_PICTURE_COUNT; i++)
h->DPB[i].needs_realloc = 1;
}
h->cur_pic_ptr = NULL;
for (i = 0; i < h->nb_slice_ctx; i++) {
H264SliceContext *sl = &h->slice_ctx[i];
av_freep(&sl->dc_val_base);
av_freep(&sl->er.mb_index2xy);
av_freep(&sl->er.error_status_table);
av_freep(&sl->er.er_temp_buffer);
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;
if (free_rbsp) {
av_freep(&sl->rbsp_buffer);
sl->rbsp_buffer_size = 0;
}
}
}
int ff_h264_alloc_tables(H264Context *h)
{
const int big_mb_num = h->mb_stride * (h->mb_height + 1);
const int row_mb_num = h->mb_stride * 2 * h->avctx->thread_count;
int x, y, i;
FF_ALLOCZ_OR_GOTO(h->avctx, h->intra4x4_pred_mode,
row_mb_num * 8 * sizeof(uint8_t), fail)
h->slice_ctx[0].intra4x4_pred_mode = h->intra4x4_pred_mode;
FF_ALLOCZ_OR_GOTO(h->avctx, h->non_zero_count,
big_mb_num * 48 * sizeof(uint8_t), fail)
FF_ALLOCZ_OR_GOTO(h->avctx, h->slice_table_base,
(big_mb_num + h->mb_stride) * sizeof(*h->slice_table_base), fail)
FF_ALLOCZ_OR_GOTO(h->avctx, h->cbp_table,
big_mb_num * sizeof(uint16_t), fail)
FF_ALLOCZ_OR_GOTO(h->avctx, h->chroma_pred_mode_table,
big_mb_num * sizeof(uint8_t), fail)
FF_ALLOCZ_OR_GOTO(h->avctx, h->mvd_table[0],
16 * row_mb_num * sizeof(uint8_t), fail);
FF_ALLOCZ_OR_GOTO(h->avctx, h->mvd_table[1],
16 * row_mb_num * sizeof(uint8_t), fail);
h->slice_ctx[0].mvd_table[0] = h->mvd_table[0];
h->slice_ctx[0].mvd_table[1] = h->mvd_table[1];
FF_ALLOCZ_OR_GOTO(h->avctx, h->direct_table,
4 * big_mb_num * sizeof(uint8_t), fail);
FF_ALLOCZ_OR_GOTO(h->avctx, h->list_counts,
big_mb_num * sizeof(uint8_t), fail)
memset(h->slice_table_base, -1,
(big_mb_num + h->mb_stride) * sizeof(*h->slice_table_base));
h->slice_table = h->slice_table_base + h->mb_stride * 2 + 1;
FF_ALLOCZ_OR_GOTO(h->avctx, h->mb2b_xy,
big_mb_num * sizeof(uint32_t), fail);
FF_ALLOCZ_OR_GOTO(h->avctx, h->mb2br_xy,
big_mb_num * sizeof(uint32_t), fail);
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 (!h->dequant4_coeff[0])
h264_init_dequant_tables(h);
if (!h->DPB) {
h->DPB = av_mallocz_array(H264_MAX_PICTURE_COUNT, sizeof(*h->DPB));
if (!h->DPB)
goto fail;
for (i = 0; i < H264_MAX_PICTURE_COUNT; i++)
av_frame_unref(&h->DPB[i].f);
av_frame_unref(&h->cur_pic.f);
}
return 0;
fail:
ff_h264_free_tables(h, 1);
return AVERROR(ENOMEM);
}
/**
* Init context
* Allocate buffers which are not shared amongst multiple threads.
*/
int ff_h264_slice_context_init(H264Context *h, H264SliceContext *sl)
{
ERContext *er = &sl->er;
int mb_array_size = h->mb_height * h->mb_stride;
int y_size = (2 * h->mb_width + 1) * (2 * h->mb_height + 1);
int c_size = h->mb_stride * (h->mb_height + 1);
int yc_size = y_size + 2 * c_size;
int x, y, i;
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;
if (CONFIG_ERROR_RESILIENCE) {
/* 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
FF_ALLOCZ_OR_GOTO(h->avctx, er->mb_index2xy,
(h->mb_num + 1) * sizeof(int), fail);
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;
FF_ALLOCZ_OR_GOTO(h->avctx, er->error_status_table,
mb_array_size * sizeof(uint8_t), fail);
FF_ALLOC_OR_GOTO(h->avctx, er->er_temp_buffer,
h->mb_height * h->mb_stride, fail);
FF_ALLOCZ_OR_GOTO(h->avctx, sl->dc_val_base,
yc_size * sizeof(int16_t), fail);
er->dc_val[0] = sl->dc_val_base + h->mb_width * 2 + 2;
er->dc_val[1] = sl->dc_val_base + y_size + h->mb_stride + 1;
er->dc_val[2] = er->dc_val[1] + c_size;
for (i = 0; i < yc_size; i++)
sl->dc_val_base[i] = 1024;
}
return 0;
fail:
return AVERROR(ENOMEM); // ff_h264_free_tables will clean up for us
}
static int decode_nal_units(H264Context *h, const uint8_t *buf, int buf_size,
int parse_extradata);
int ff_h264_decode_extradata(H264Context *h)
{
AVCodecContext *avctx = h->avctx;
int ret;
if (avctx->extradata[0] == 1) {
int i, cnt, nalsize;
unsigned char *p = avctx->extradata;
h->is_avc = 1;
if (avctx->extradata_size < 7) {
av_log(avctx, AV_LOG_ERROR,
"avcC %d too short\n", avctx->extradata_size);
return AVERROR_INVALIDDATA;
}
/* sps and pps in the avcC always have length coded with 2 bytes,
* so put a fake nal_length_size = 2 while parsing them */
h->nal_length_size = 2;
// Decode sps from avcC
cnt = *(p + 5) & 0x1f; // Number of sps
p += 6;
for (i = 0; i < cnt; i++) {
nalsize = AV_RB16(p) + 2;
if (p - avctx->extradata + nalsize > avctx->extradata_size)
return AVERROR_INVALIDDATA;
ret = decode_nal_units(h, p, nalsize, 1);
if (ret < 0) {
av_log(avctx, AV_LOG_ERROR,
"Decoding sps %d from avcC failed\n", i);
return ret;
}
p += nalsize;
}
// Decode pps from avcC
cnt = *(p++); // Number of pps
for (i = 0; i < cnt; i++) {
nalsize = AV_RB16(p) + 2;
if (p - avctx->extradata + nalsize > avctx->extradata_size)
return AVERROR_INVALIDDATA;
ret = decode_nal_units(h, p, nalsize, 1);
if (ret < 0) {
av_log(avctx, AV_LOG_ERROR,
"Decoding pps %d from avcC failed\n", i);
return ret;
}
p += nalsize;
}
// Store right nal length size that will be used to parse all other nals
h->nal_length_size = (avctx->extradata[4] & 0x03) + 1;
} else {
h->is_avc = 0;
ret = decode_nal_units(h, avctx->extradata, avctx->extradata_size, 1);
if (ret < 0)
return ret;
}
return 0;
}
static int h264_init_context(AVCodecContext *avctx, H264Context *h)
{
int i;
h->avctx = avctx;
h->dequant_coeff_pps = -1;
h->cur_chroma_format_idc = -1;
h->picture_structure = PICT_FRAME;
h->slice_context_count = 1;
h->workaround_bugs = avctx->workaround_bugs;
h->flags = avctx->flags;
h->prev_poc_msb = 1 << 16;
h->x264_build = -1;
h->recovery_frame = -1;
h->frame_recovered = 0;
h->outputed_poc = h->next_outputed_poc = INT_MIN;
for (i = 0; i < MAX_DELAYED_PIC_COUNT; i++)
h->last_pocs[i] = INT_MIN;
ff_h264_reset_sei(h);
avctx->chroma_sample_location = AVCHROMA_LOC_LEFT;
h->nb_slice_ctx = (avctx->active_thread_type & FF_THREAD_SLICE) ? H264_MAX_THREADS : 1;
h->slice_ctx = av_mallocz_array(h->nb_slice_ctx, sizeof(*h->slice_ctx));
if (!h->slice_ctx) {
h->nb_slice_ctx = 0;
return AVERROR(ENOMEM);
}
for (i = 0; i < h->nb_slice_ctx; i++)
h->slice_ctx[i].h264 = h;
return 0;
}
av_cold int ff_h264_decode_init(AVCodecContext *avctx)
{
H264Context *h = avctx->priv_data;
int ret;
ret = h264_init_context(avctx, h);
if (ret < 0)
return ret;
/* set defaults */
if (!avctx->has_b_frames)
h->low_delay = 1;
ff_h264_decode_init_vlc();
ff_init_cabac_states();
if (avctx->codec_id == AV_CODEC_ID_H264) {
if (avctx->ticks_per_frame == 1)
h->avctx->framerate.num *= 2;
avctx->ticks_per_frame = 2;
}
if (avctx->extradata_size > 0 && avctx->extradata) {
ret = ff_h264_decode_extradata(h);
if (ret < 0) {
ff_h264_free_context(h);
return ret;
}
}
if (h->sps.bitstream_restriction_flag &&
h->avctx->has_b_frames < h->sps.num_reorder_frames) {
h->avctx->has_b_frames = h->sps.num_reorder_frames;
h->low_delay = 0;
}
avctx->internal->allocate_progress = 1;
if (h->enable_er) {
av_log(avctx, AV_LOG_WARNING,
"Error resilience is enabled. It is unsafe and unsupported and may crash. "
"Use it at your own risk\n");
}
return 0;
}
static int decode_init_thread_copy(AVCodecContext *avctx)
{
H264Context *h = avctx->priv_data;
int ret;
if (!avctx->internal->is_copy)
return 0;
memset(h, 0, sizeof(*h));
ret = h264_init_context(avctx, h);
if (ret < 0)
return ret;
h->context_initialized = 0;
return 0;
}
/**
* Run setup operations that must be run after slice header decoding.
* This includes finding the next displayed frame.
*
* @param h h264 master context
* @param setup_finished enough NALs have been read that we can call
* ff_thread_finish_setup()
*/
static void decode_postinit(H264Context *h, int setup_finished)
{
H264Picture *out = h->cur_pic_ptr;
H264Picture *cur = h->cur_pic_ptr;
int i, pics, out_of_order, out_idx;
int invalid = 0, cnt = 0;
h->cur_pic_ptr->f.pict_type = h->pict_type;
if (h->next_output_pic)
return;
if (cur->field_poc[0] == INT_MAX || cur->field_poc[1] == INT_MAX) {
/* FIXME: if we have two PAFF fields in one packet, we can't start
* the next thread here. If we have one field per packet, we can.
* The check in decode_nal_units() is not good enough to find this
* yet, so we assume the worst for now. */
// if (setup_finished)
// ff_thread_finish_setup(h->avctx);
return;
}
cur->f.interlaced_frame = 0;
cur->f.repeat_pict = 0;
/* Signal interlacing information externally. */
/* Prioritize picture timing SEI information over used
* decoding process if it exists. */
if (h->sps.pic_struct_present_flag) {
switch (h->sei_pic_struct) {
case SEI_PIC_STRUCT_FRAME:
break;
case SEI_PIC_STRUCT_TOP_FIELD:
case SEI_PIC_STRUCT_BOTTOM_FIELD:
cur->f.interlaced_frame = 1;
break;
case SEI_PIC_STRUCT_TOP_BOTTOM:
case SEI_PIC_STRUCT_BOTTOM_TOP:
if (FIELD_OR_MBAFF_PICTURE(h))
cur->f.interlaced_frame = 1;
else
// try to flag soft telecine progressive
cur->f.interlaced_frame = h->prev_interlaced_frame;
break;
case SEI_PIC_STRUCT_TOP_BOTTOM_TOP:
case SEI_PIC_STRUCT_BOTTOM_TOP_BOTTOM:
/* Signal the possibility of telecined film externally
* (pic_struct 5,6). From these hints, let the applications
* decide if they apply deinterlacing. */
cur->f.repeat_pict = 1;
break;
case SEI_PIC_STRUCT_FRAME_DOUBLING:
cur->f.repeat_pict = 2;
break;
case SEI_PIC_STRUCT_FRAME_TRIPLING:
cur->f.repeat_pict = 4;
break;
}
if ((h->sei_ct_type & 3) &&
h->sei_pic_struct <= SEI_PIC_STRUCT_BOTTOM_TOP)
cur->f.interlaced_frame = (h->sei_ct_type & (1 << 1)) != 0;
} else {
/* Derive interlacing flag from used decoding process. */
cur->f.interlaced_frame = FIELD_OR_MBAFF_PICTURE(h);
}
h->prev_interlaced_frame = cur->f.interlaced_frame;
if (cur->field_poc[0] != cur->field_poc[1]) {
/* Derive top_field_first from field pocs. */
cur->f.top_field_first = cur->field_poc[0] < cur->field_poc[1];
} else {
if (cur->f.interlaced_frame || h->sps.pic_struct_present_flag) {
/* Use picture timing SEI information. Even if it is a
* information of a past frame, better than nothing. */
if (h->sei_pic_struct == SEI_PIC_STRUCT_TOP_BOTTOM ||
h->sei_pic_struct == SEI_PIC_STRUCT_TOP_BOTTOM_TOP)
cur->f.top_field_first = 1;
else
cur->f.top_field_first = 0;
} else {
/* Most likely progressive */
cur->f.top_field_first = 0;
}
}
if (h->sei_frame_packing_present &&
h->frame_packing_arrangement_type >= 0 &&
h->frame_packing_arrangement_type <= 6 &&
h->content_interpretation_type > 0 &&
h->content_interpretation_type < 3) {
AVStereo3D *stereo = av_stereo3d_create_side_data(&cur->f);
if (!stereo)
return;
switch (h->frame_packing_arrangement_type) {
case 0:
stereo->type = AV_STEREO3D_CHECKERBOARD;
break;
case 1:
stereo->type = AV_STEREO3D_COLUMNS;
break;
case 2:
stereo->type = AV_STEREO3D_LINES;
break;
case 3:
if (h->quincunx_subsampling)
stereo->type = AV_STEREO3D_SIDEBYSIDE_QUINCUNX;
else
stereo->type = AV_STEREO3D_SIDEBYSIDE;
break;
case 4:
stereo->type = AV_STEREO3D_TOPBOTTOM;
break;
case 5:
stereo->type = AV_STEREO3D_FRAMESEQUENCE;
break;
case 6:
stereo->type = AV_STEREO3D_2D;
break;
}
if (h->content_interpretation_type == 2)
stereo->flags = AV_STEREO3D_FLAG_INVERT;
}
if (h->sei_display_orientation_present &&
(h->sei_anticlockwise_rotation || h->sei_hflip || h->sei_vflip)) {
double angle = h->sei_anticlockwise_rotation * 360 / (double) (1 << 16);
AVFrameSideData *rotation = av_frame_new_side_data(&cur->f,
AV_FRAME_DATA_DISPLAYMATRIX,
sizeof(int32_t) * 9);
if (!rotation)
return;
av_display_rotation_set((int32_t *)rotation->data, angle);
av_display_matrix_flip((int32_t *)rotation->data,
h->sei_hflip, h->sei_vflip);
}
// FIXME do something with unavailable reference frames
/* Sort B-frames into display order */
if (h->sps.bitstream_restriction_flag &&
h->avctx->has_b_frames < h->sps.num_reorder_frames) {
h->avctx->has_b_frames = h->sps.num_reorder_frames;
h->low_delay = 0;
}
if (h->avctx->strict_std_compliance >= FF_COMPLIANCE_STRICT &&
!h->sps.bitstream_restriction_flag) {
h->avctx->has_b_frames = MAX_DELAYED_PIC_COUNT - 1;
h->low_delay = 0;
}
pics = 0;
while (h->delayed_pic[pics])
pics++;
assert(pics <= MAX_DELAYED_PIC_COUNT);
h->delayed_pic[pics++] = cur;
if (cur->reference == 0)
cur->reference = DELAYED_PIC_REF;
/* Frame reordering. This code takes pictures from coding order and sorts
* them by their incremental POC value into display order. It supports POC
* gaps, MMCO reset codes and random resets.
* A "display group" can start either with a IDR frame (f.key_frame = 1),
* and/or can be closed down with a MMCO reset code. In sequences where
* there is no delay, we can't detect that (since the frame was already
* output to the user), so we also set h->mmco_reset to detect the MMCO
* reset code.
* FIXME: if we detect insufficient delays (as per h->avctx->has_b_frames),
* we increase the delay between input and output. All frames affected by
* the lag (e.g. those that should have been output before another frame
* that we already returned to the user) will be dropped. This is a bug
* that we will fix later. */
for (i = 0; i < MAX_DELAYED_PIC_COUNT; i++) {
cnt += out->poc < h->last_pocs[i];
invalid += out->poc == INT_MIN;
}
if (!h->mmco_reset && !cur->f.key_frame &&
cnt + invalid == MAX_DELAYED_PIC_COUNT && cnt > 0) {
h->mmco_reset = 2;
if (pics > 1)
h->delayed_pic[pics - 2]->mmco_reset = 2;
}
if (h->mmco_reset || cur->f.key_frame) {
for (i = 0; i < MAX_DELAYED_PIC_COUNT; i++)
h->last_pocs[i] = INT_MIN;
cnt = 0;
invalid = MAX_DELAYED_PIC_COUNT;
}
out = h->delayed_pic[0];
out_idx = 0;
for (i = 1; i < MAX_DELAYED_PIC_COUNT &&
h->delayed_pic[i] &&
!h->delayed_pic[i - 1]->mmco_reset &&
!h->delayed_pic[i]->f.key_frame;
i++)
if (h->delayed_pic[i]->poc < out->poc) {
out = h->delayed_pic[i];
out_idx = i;
}
if (h->avctx->has_b_frames == 0 &&
(h->delayed_pic[0]->f.key_frame || h->mmco_reset))
h->next_outputed_poc = INT_MIN;
out_of_order = !out->f.key_frame && !h->mmco_reset &&
(out->poc < h->next_outputed_poc);
if (h->sps.bitstream_restriction_flag &&
h->avctx->has_b_frames >= h->sps.num_reorder_frames) {
} else if (out_of_order && pics - 1 == h->avctx->has_b_frames &&
h->avctx->has_b_frames < MAX_DELAYED_PIC_COUNT) {
if (invalid + cnt < MAX_DELAYED_PIC_COUNT) {
h->avctx->has_b_frames = FFMAX(h->avctx->has_b_frames, cnt);
}
h->low_delay = 0;
} else if (h->low_delay &&
((h->next_outputed_poc != INT_MIN &&
out->poc > h->next_outputed_poc + 2) ||
cur->f.pict_type == AV_PICTURE_TYPE_B)) {
h->low_delay = 0;
h->avctx->has_b_frames++;
}
if (pics > h->avctx->has_b_frames) {
out->reference &= ~DELAYED_PIC_REF;
// for frame threading, the owner must be the second field's thread or
// else the first thread can release the picture and reuse it unsafely
for (i = out_idx; h->delayed_pic[i]; i++)
h->delayed_pic[i] = h->delayed_pic[i + 1];
}
memmove(h->last_pocs, &h->last_pocs[1],
sizeof(*h->last_pocs) * (MAX_DELAYED_PIC_COUNT - 1));
h->last_pocs[MAX_DELAYED_PIC_COUNT - 1] = cur->poc;
if (!out_of_order && pics > h->avctx->has_b_frames) {
h->next_output_pic = out;
if (out->mmco_reset) {
if (out_idx > 0) {
h->next_outputed_poc = out->poc;
h->delayed_pic[out_idx - 1]->mmco_reset = out->mmco_reset;
} else {
h->next_outputed_poc = INT_MIN;
}
} else {
if (out_idx == 0 && pics > 1 && h->delayed_pic[0]->f.key_frame) {
h->next_outputed_poc = INT_MIN;
} else {
h->next_outputed_poc = out->poc;
}
}
h->mmco_reset = 0;
} else {
av_log(h->avctx, AV_LOG_DEBUG, "no picture\n");
}
if (h->next_output_pic) {
if (h->next_output_pic->recovered) {
// We have reached an recovery point and all frames after it in
// display order are "recovered".
h->frame_recovered |= FRAME_RECOVERED_SEI;
}
h->next_output_pic->recovered |= !!(h->frame_recovered & FRAME_RECOVERED_SEI);
}
if (setup_finished && !h->avctx->hwaccel)
ff_thread_finish_setup(h->avctx);
}
int ff_pred_weight_table(H264Context *h, H264SliceContext *sl)
{
int list, i;
int luma_def, chroma_def;
sl->use_weight = 0;
sl->use_weight_chroma = 0;
sl->luma_log2_weight_denom = get_ue_golomb(&sl->gb);
if (h->sps.chroma_format_idc)
sl->chroma_log2_weight_denom = get_ue_golomb(&sl->gb);
luma_def = 1 << sl->luma_log2_weight_denom;
chroma_def = 1 << sl->chroma_log2_weight_denom;
for (list = 0; list < 2; list++) {
sl->luma_weight_flag[list] = 0;
sl->chroma_weight_flag[list] = 0;
for (i = 0; i < sl->ref_count[list]; i++) {
int luma_weight_flag, chroma_weight_flag;
luma_weight_flag = get_bits1(&sl->gb);
if (luma_weight_flag) {
sl->luma_weight[i][list][0] = get_se_golomb(&sl->gb);
sl->luma_weight[i][list][1] = get_se_golomb(&sl->gb);
if (sl->luma_weight[i][list][0] != luma_def ||
sl->luma_weight[i][list][1] != 0) {
sl->use_weight = 1;
sl->luma_weight_flag[list] = 1;
}
} else {
sl->luma_weight[i][list][0] = luma_def;
sl->luma_weight[i][list][1] = 0;
}
if (h->sps.chroma_format_idc) {
chroma_weight_flag = get_bits1(&sl->gb);
if (chroma_weight_flag) {
int j;
for (j = 0; j < 2; j++) {
sl->chroma_weight[i][list][j][0] = get_se_golomb(&sl->gb);
sl->chroma_weight[i][list][j][1] = get_se_golomb(&sl->gb);
if (sl->chroma_weight[i][list][j][0] != chroma_def ||
sl->chroma_weight[i][list][j][1] != 0) {
sl->use_weight_chroma = 1;
sl->chroma_weight_flag[list] = 1;
}
}
} else {
int j;
for (j = 0; j < 2; j++) {
sl->chroma_weight[i][list][j][0] = chroma_def;
sl->chroma_weight[i][list][j][1] = 0;
}
}
}
}
if (sl->slice_type_nos != AV_PICTURE_TYPE_B)
break;
}
sl->use_weight = sl->use_weight || sl->use_weight_chroma;
return 0;
}
/**
* instantaneous decoder refresh.
*/
static void idr(H264Context *h)
{
ff_h264_remove_all_refs(h);
h->prev_frame_num =
h->prev_frame_num_offset =
h->prev_poc_msb =
h->prev_poc_lsb = 0;
}
/* forget old pics after a seek */
void ff_h264_flush_change(H264Context *h)
{
int i;
for (i = 0; i < MAX_DELAYED_PIC_COUNT; i++)
h->last_pocs[i] = INT_MIN;
h->outputed_poc = h->next_outputed_poc = INT_MIN;
h->prev_interlaced_frame = 1;
idr(h);
if (h->cur_pic_ptr)
h->cur_pic_ptr->reference = 0;
h->first_field = 0;
ff_h264_reset_sei(h);
h->recovery_frame = -1;
h->frame_recovered = 0;
}
/* forget old pics after a seek */
static void flush_dpb(AVCodecContext *avctx)
{
H264Context *h = avctx->priv_data;
int i;
memset(h->delayed_pic, 0, sizeof(h->delayed_pic));
ff_h264_flush_change(h);
if (h->DPB)
for (i = 0; i < H264_MAX_PICTURE_COUNT; i++)
ff_h264_unref_picture(h, &h->DPB[i]);
h->cur_pic_ptr = NULL;
ff_h264_unref_picture(h, &h->cur_pic);
h->mb_y = 0;
ff_h264_free_tables(h, 1);
h->context_initialized = 0;
}
int ff_init_poc(H264Context *h, int pic_field_poc[2], int *pic_poc)
{
const int max_frame_num = 1 << h->sps.log2_max_frame_num;
int field_poc[2];
h->frame_num_offset = h->prev_frame_num_offset;
if (h->frame_num < h->prev_frame_num)
h->frame_num_offset += max_frame_num;
if (h->sps.poc_type == 0) {
const int max_poc_lsb = 1 << h->sps.log2_max_poc_lsb;
if (h->poc_lsb < h->prev_poc_lsb &&
h->prev_poc_lsb - h->poc_lsb >= max_poc_lsb / 2)
h->poc_msb = h->prev_poc_msb + max_poc_lsb;
else if (h->poc_lsb > h->prev_poc_lsb &&
h->prev_poc_lsb - h->poc_lsb < -max_poc_lsb / 2)
h->poc_msb = h->prev_poc_msb - max_poc_lsb;
else
h->poc_msb = h->prev_poc_msb;
field_poc[0] =
field_poc[1] = h->poc_msb + h->poc_lsb;
if (h->picture_structure == PICT_FRAME)
field_poc[1] += h->delta_poc_bottom;
} else if (h->sps.poc_type == 1) {
int abs_frame_num, expected_delta_per_poc_cycle, expectedpoc;
int i;
if (h->sps.poc_cycle_length != 0)
abs_frame_num = h->frame_num_offset + h->frame_num;
else
abs_frame_num = 0;
if (h->nal_ref_idc == 0 && abs_frame_num > 0)
abs_frame_num--;
expected_delta_per_poc_cycle = 0;
for (i = 0; i < h->sps.poc_cycle_length; i++)
// FIXME integrate during sps parse
expected_delta_per_poc_cycle += h->sps.offset_for_ref_frame[i];
if (abs_frame_num > 0) {
int poc_cycle_cnt = (abs_frame_num - 1) / h->sps.poc_cycle_length;
int frame_num_in_poc_cycle = (abs_frame_num - 1) % h->sps.poc_cycle_length;
expectedpoc = poc_cycle_cnt * expected_delta_per_poc_cycle;
for (i = 0; i <= frame_num_in_poc_cycle; i++)
expectedpoc = expectedpoc + h->sps.offset_for_ref_frame[i];
} else
expectedpoc = 0;
if (h->nal_ref_idc == 0)
expectedpoc = expectedpoc + h->sps.offset_for_non_ref_pic;
field_poc[0] = expectedpoc + h->delta_poc[0];
field_poc[1] = field_poc[0] + h->sps.offset_for_top_to_bottom_field;
if (h->picture_structure == PICT_FRAME)
field_poc[1] += h->delta_poc[1];
} else {
int poc = 2 * (h->frame_num_offset + h->frame_num);
if (!h->nal_ref_idc)
poc--;
field_poc[0] = poc;
field_poc[1] = poc;
}
if (h->picture_structure != PICT_BOTTOM_FIELD)
pic_field_poc[0] = field_poc[0];
if (h->picture_structure != PICT_TOP_FIELD)
pic_field_poc[1] = field_poc[1];
*pic_poc = FFMIN(pic_field_poc[0], pic_field_poc[1]);
return 0;
}
/**
* Compute profile from profile_idc and constraint_set?_flags.
*
* @param sps SPS
*
* @return profile as defined by FF_PROFILE_H264_*
*/
int ff_h264_get_profile(SPS *sps)
{
int profile = sps->profile_idc;
switch (sps->profile_idc) {
case FF_PROFILE_H264_BASELINE:
// constraint_set1_flag set to 1
profile |= (sps->constraint_set_flags & 1 << 1) ? FF_PROFILE_H264_CONSTRAINED : 0;
break;
case FF_PROFILE_H264_HIGH_10:
case FF_PROFILE_H264_HIGH_422:
case FF_PROFILE_H264_HIGH_444_PREDICTIVE:
// constraint_set3_flag set to 1
profile |= (sps->constraint_set_flags & 1 << 3) ? FF_PROFILE_H264_INTRA : 0;
break;
}
return profile;
}
int ff_h264_set_parameter_from_sps(H264Context *h)
{
if (h->flags & CODEC_FLAG_LOW_DELAY ||
(h->sps.bitstream_restriction_flag &&
!h->sps.num_reorder_frames)) {
if (h->avctx->has_b_frames > 1 || h->delayed_pic[0])
av_log(h->avctx, AV_LOG_WARNING, "Delayed frames seen. "
"Reenabling low delay requires a codec flush.\n");
else
h->low_delay = 1;
}
if (h->avctx->has_b_frames < 2)
h->avctx->has_b_frames = !h->low_delay;
if (h->avctx->bits_per_raw_sample != h->sps.bit_depth_luma ||
h->cur_chroma_format_idc != h->sps.chroma_format_idc) {
if (h->sps.bit_depth_luma >= 8 && h->sps.bit_depth_luma <= 10) {
h->avctx->bits_per_raw_sample = h->sps.bit_depth_luma;
h->cur_chroma_format_idc = h->sps.chroma_format_idc;
h->pixel_shift = h->sps.bit_depth_luma > 8;
ff_h264dsp_init(&h->h264dsp, h->sps.bit_depth_luma,
h->sps.chroma_format_idc);
ff_h264chroma_init(&h->h264chroma, h->sps.bit_depth_chroma);
ff_h264qpel_init(&h->h264qpel, h->sps.bit_depth_luma);
ff_h264_pred_init(&h->hpc, h->avctx->codec_id, h->sps.bit_depth_luma,
h->sps.chroma_format_idc);
ff_videodsp_init(&h->vdsp, h->sps.bit_depth_luma);
} else {
av_log(h->avctx, AV_LOG_ERROR, "Unsupported bit depth %d\n",
h->sps.bit_depth_luma);
return AVERROR_INVALIDDATA;
}
}
return 0;
}
int ff_set_ref_count(H264Context *h, H264SliceContext *sl)
{
int ref_count[2], list_count;
int num_ref_idx_active_override_flag, max_refs;
// set defaults, might be overridden a few lines later
ref_count[0] = h->pps.ref_count[0];
ref_count[1] = h->pps.ref_count[1];
if (sl->slice_type_nos != AV_PICTURE_TYPE_I) {
if (sl->slice_type_nos == AV_PICTURE_TYPE_B)
sl->direct_spatial_mv_pred = get_bits1(&sl->gb);
num_ref_idx_active_override_flag = get_bits1(&sl->gb);
if (num_ref_idx_active_override_flag) {
ref_count[0] = get_ue_golomb(&sl->gb) + 1;
if (ref_count[0] < 1)
return AVERROR_INVALIDDATA;
if (sl->slice_type_nos == AV_PICTURE_TYPE_B) {
ref_count[1] = get_ue_golomb(&sl->gb) + 1;
if (ref_count[1] < 1)
return AVERROR_INVALIDDATA;
}
}
if (sl->slice_type_nos == AV_PICTURE_TYPE_B)
list_count = 2;
else
list_count = 1;
} else {
list_count = 0;
ref_count[0] = ref_count[1] = 0;
}
max_refs = h->picture_structure == PICT_FRAME ? 16 : 32;
if (ref_count[0] > max_refs || ref_count[1] > max_refs) {
av_log(h->avctx, AV_LOG_ERROR, "reference overflow\n");
sl->ref_count[0] = sl->ref_count[1] = 0;
return AVERROR_INVALIDDATA;
}
if (list_count != sl->list_count ||
ref_count[0] != sl->ref_count[0] ||
ref_count[1] != sl->ref_count[1]) {
sl->ref_count[0] = ref_count[0];
sl->ref_count[1] = ref_count[1];
sl->list_count = list_count;
return 1;
}
return 0;
}
static int find_start_code(const uint8_t *buf, int buf_size,
int buf_index, int next_avc)
{
// start code prefix search
for (; buf_index + 3 < next_avc; buf_index++)
// This should always succeed in the first iteration.
if (buf[buf_index] == 0 &&
buf[buf_index + 1] == 0 &&
buf[buf_index + 2] == 1)
break;
if (buf_index + 3 >= buf_size)
return buf_size;
return buf_index + 3;
}
static int get_avc_nalsize(H264Context *h, const uint8_t *buf,
int buf_size, int *buf_index)
{
int i, nalsize = 0;
if (*buf_index >= buf_size - h->nal_length_size)
return -1;
for (i = 0; i < h->nal_length_size; i++)
nalsize = (nalsize << 8) | buf[(*buf_index)++];
if (nalsize <= 0 || nalsize > buf_size - *buf_index) {
av_log(h->avctx, AV_LOG_ERROR,
"AVC: nal size %d\n", nalsize);
return -1;
}
return nalsize;
}
static int get_bit_length(H264Context *h, const uint8_t *buf,
const uint8_t *ptr, int dst_length,
int i, int next_avc)
{
if ((h->workaround_bugs & FF_BUG_AUTODETECT) && i + 3 < next_avc &&
buf[i] == 0x00 && buf[i + 1] == 0x00 &&
buf[i + 2] == 0x01 && buf[i + 3] == 0xE0)
h->workaround_bugs |= FF_BUG_TRUNCATED;
if (!(h->workaround_bugs & FF_BUG_TRUNCATED))
while (dst_length > 0 && ptr[dst_length - 1] == 0)
dst_length--;
if (!dst_length)
return 0;
return 8 * dst_length - decode_rbsp_trailing(h, ptr + dst_length - 1);
}
static int get_last_needed_nal(H264Context *h, const uint8_t *buf, int buf_size)
{
int next_avc = h->is_avc ? 0 : buf_size;
int nal_index = 0;
int buf_index = 0;
int nals_needed = 0;
while(1) {
GetBitContext gb;
int nalsize = 0;
int dst_length, bit_length, consumed;
const uint8_t *ptr;
if (buf_index >= next_avc) {
nalsize = get_avc_nalsize(h, buf, buf_size, &buf_index);
if (nalsize < 0)
break;
next_avc = buf_index + nalsize;
} else {
buf_index = find_start_code(buf, buf_size, buf_index, next_avc);
if (buf_index >= buf_size)
break;
}
ptr = ff_h264_decode_nal(h, &h->slice_ctx[0], buf + buf_index, &dst_length, &consumed,
next_avc - buf_index);
if (!ptr || dst_length < 0)
return AVERROR_INVALIDDATA;
buf_index += consumed;
bit_length = get_bit_length(h, buf, ptr, dst_length,
buf_index, next_avc);
nal_index++;
/* 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 (h->nal_unit_type) {
case NAL_SPS:
case NAL_PPS:
nals_needed = nal_index;
break;
case NAL_DPA:
case NAL_IDR_SLICE:
case NAL_SLICE:
init_get_bits(&gb, ptr, bit_length);
if (!get_ue_golomb(&gb))
nals_needed = nal_index;
}
}
return nals_needed;
}
static int decode_nal_units(H264Context *h, const uint8_t *buf, int buf_size,
int parse_extradata)
{
AVCodecContext *const avctx = h->avctx;
H264SliceContext *sl;
int buf_index;
unsigned context_count;
int next_avc;
int nals_needed = 0; ///< number of NALs that need decoding before the next frame thread starts
int nal_index;
int ret = 0;
h->max_contexts = h->slice_context_count;
if (!(avctx->flags2 & CODEC_FLAG2_CHUNKS)) {
h->current_slice = 0;
if (!h->first_field)
h->cur_pic_ptr = NULL;
ff_h264_reset_sei(h);
}
if (avctx->active_thread_type & FF_THREAD_FRAME)
nals_needed = get_last_needed_nal(h, buf, buf_size);
{
buf_index = 0;
context_count = 0;
next_avc = h->is_avc ? 0 : buf_size;
nal_index = 0;
for (;;) {
int consumed;
int dst_length;
int bit_length;
const uint8_t *ptr;
int nalsize = 0;
int err;
if (buf_index >= next_avc) {
nalsize = get_avc_nalsize(h, buf, buf_size, &buf_index);
if (nalsize < 0)
break;
next_avc = buf_index + nalsize;
} else {
buf_index = find_start_code(buf, buf_size, buf_index, next_avc);
if (buf_index >= buf_size)
break;
if (buf_index >= next_avc)
continue;
}
sl = &h->slice_ctx[context_count];
ptr = ff_h264_decode_nal(h, sl, buf + buf_index, &dst_length,
&consumed, next_avc - buf_index);
if (!ptr || dst_length < 0) {
ret = -1;
goto end;
}
bit_length = get_bit_length(h, buf, ptr, dst_length,
buf_index + consumed, next_avc);
if (h->avctx->debug & FF_DEBUG_STARTCODE)
av_log(h->avctx, AV_LOG_DEBUG,
"NAL %d at %d/%d length %d\n",
h->nal_unit_type, buf_index, buf_size, dst_length);
if (h->is_avc && (nalsize != consumed) && nalsize)
av_log(h->avctx, AV_LOG_DEBUG,
"AVC: Consumed only %d bytes instead of %d\n",
consumed, nalsize);
buf_index += consumed;
nal_index++;
if (avctx->skip_frame >= AVDISCARD_NONREF &&
h->nal_ref_idc == 0 &&
h->nal_unit_type != NAL_SEI)
continue;
again:
/* Ignore every NAL unit type except PPS and SPS during extradata
* parsing. Decoding slices is not possible in codec init
* with frame-mt */
if (parse_extradata && HAVE_THREADS &&
(h->avctx->active_thread_type & FF_THREAD_FRAME) &&
(h->nal_unit_type != NAL_PPS &&
h->nal_unit_type != NAL_SPS)) {
if (h->nal_unit_type < NAL_AUD ||
h->nal_unit_type > NAL_AUXILIARY_SLICE)
av_log(avctx, AV_LOG_INFO,
"Ignoring NAL unit %d during extradata parsing\n",
h->nal_unit_type);
h->nal_unit_type = NAL_FF_IGNORE;
}
err = 0;
switch (h->nal_unit_type) {
case NAL_IDR_SLICE:
if (h->nal_unit_type != NAL_IDR_SLICE) {
av_log(h->avctx, AV_LOG_ERROR,
"Invalid mix of idr and non-idr slices\n");
ret = -1;
goto end;
}
idr(h); // FIXME ensure we don't lose some frames if there is reordering
case NAL_SLICE:
init_get_bits(&sl->gb, ptr, bit_length);
if ((err = ff_h264_decode_slice_header(h, sl)))
break;
if (h->sei_recovery_frame_cnt >= 0 && h->recovery_frame < 0) {
h->recovery_frame = (h->frame_num + h->sei_recovery_frame_cnt) &
((1 << h->sps.log2_max_frame_num) - 1);
}
h->cur_pic_ptr->f.key_frame |=
(h->nal_unit_type == NAL_IDR_SLICE) ||
(h->sei_recovery_frame_cnt >= 0);
if (h->nal_unit_type == NAL_IDR_SLICE ||
h->recovery_frame == h->frame_num) {
h->recovery_frame = -1;
h->cur_pic_ptr->recovered = 1;
}
// If we have an IDR, all frames after it in decoded order are
// "recovered".
if (h->nal_unit_type == NAL_IDR_SLICE)
h->frame_recovered |= FRAME_RECOVERED_IDR;
h->cur_pic_ptr->recovered |= !!(h->frame_recovered & FRAME_RECOVERED_IDR);
if (h->current_slice == 1) {
if (!(avctx->flags2 & CODEC_FLAG2_CHUNKS))
decode_postinit(h, nal_index >= nals_needed);
if (h->avctx->hwaccel &&
(ret = h->avctx->hwaccel->start_frame(h->avctx, NULL, 0)) < 0)
return ret;
}
if (sl->redundant_pic_count == 0 &&
(avctx->skip_frame < AVDISCARD_NONREF ||
h->nal_ref_idc) &&
(avctx->skip_frame < AVDISCARD_BIDIR ||
sl->slice_type_nos != AV_PICTURE_TYPE_B) &&
(avctx->skip_frame < AVDISCARD_NONKEY ||
sl->slice_type_nos == AV_PICTURE_TYPE_I) &&
avctx->skip_frame < AVDISCARD_ALL) {
if (avctx->hwaccel) {
ret = avctx->hwaccel->decode_slice(avctx,
&buf[buf_index - consumed],
consumed);
if (ret < 0)
return ret;
} else
context_count++;
}
break;
case NAL_DPA:
case NAL_DPB:
case NAL_DPC:
avpriv_request_sample(avctx, "data partitioning");
ret = AVERROR(ENOSYS);
goto end;
break;
case NAL_SEI:
init_get_bits(&h->gb, ptr, bit_length);
ret = ff_h264_decode_sei(h);
if (ret < 0 && (h->avctx->err_recognition & AV_EF_EXPLODE))
goto end;
break;
case NAL_SPS:
init_get_bits(&h->gb, ptr, bit_length);
ret = ff_h264_decode_seq_parameter_set(h);
if (ret < 0 && h->is_avc && (nalsize != consumed) && nalsize) {
av_log(h->avctx, AV_LOG_DEBUG,
"SPS decoding failure, trying again with the complete NAL\n");
init_get_bits(&h->gb, buf + buf_index + 1 - consumed,
8 * (nalsize - 1));
ff_h264_decode_seq_parameter_set(h);
}
ret = ff_h264_set_parameter_from_sps(h);
if (ret < 0)
goto end;
break;
case NAL_PPS:
init_get_bits(&h->gb, ptr, bit_length);
ret = ff_h264_decode_picture_parameter_set(h, bit_length);
if (ret < 0 && (h->avctx->err_recognition & AV_EF_EXPLODE))
goto end;
break;
case NAL_AUD:
case NAL_END_SEQUENCE:
case NAL_END_STREAM:
case NAL_FILLER_DATA:
case NAL_SPS_EXT:
case NAL_AUXILIARY_SLICE:
break;
case NAL_FF_IGNORE:
break;
default:
av_log(avctx, AV_LOG_DEBUG, "Unknown NAL code: %d (%d bits)\n",
h->nal_unit_type, bit_length);
}
if (context_count == h->max_contexts) {
ret = ff_h264_execute_decode_slices(h, context_count);
if (ret < 0 && (h->avctx->err_recognition & AV_EF_EXPLODE))
goto end;
context_count = 0;
}
if (err < 0) {
av_log(h->avctx, AV_LOG_ERROR, "decode_slice_header error\n");
sl->ref_count[0] = sl->ref_count[1] = sl->list_count = 0;
} else if (err == 1) {
/* Slice could not be decoded in parallel mode, restart. Note
* that rbsp_buffer is not transferred, but since we no longer
* run in parallel mode this should not be an issue. */
sl = &h->slice_ctx[0];
goto again;
}
}
}
if (context_count) {
ret = ff_h264_execute_decode_slices(h, context_count);
if (ret < 0 && (h->avctx->err_recognition & AV_EF_EXPLODE))
goto end;
}
ret = 0;
end:
/* clean up */
if (h->cur_pic_ptr && !h->droppable) {
ff_thread_report_progress(&h->cur_pic_ptr->tf, INT_MAX,
h->picture_structure == PICT_BOTTOM_FIELD);
}
return (ret < 0) ? ret : buf_index;
}
/**
* 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 output_frame(H264Context *h, AVFrame *dst, AVFrame *src)
{
int i;
int ret = av_frame_ref(dst, src);
if (ret < 0)
return ret;
if (!h->sps.crop)
return 0;
for (i = 0; i < 3; i++) {
int hshift = (i > 0) ? h->chroma_x_shift : 0;
int vshift = (i > 0) ? h->chroma_y_shift : 0;
int off = ((h->sps.crop_left >> hshift) << h->pixel_shift) +
(h->sps.crop_top >> vshift) * dst->linesize[i];
dst->data[i] += off;
}
return 0;
}
static int h264_decode_frame(AVCodecContext *avctx, void *data,
int *got_frame, AVPacket *avpkt)
{
const uint8_t *buf = avpkt->data;
int buf_size = avpkt->size;
H264Context *h = avctx->priv_data;
AVFrame *pict = data;
int buf_index = 0;
int ret;
h->flags = avctx->flags;
/* end of stream, output what is still in the buffers */
out:
if (buf_size == 0) {
H264Picture *out;
int i, out_idx;
h->cur_pic_ptr = NULL;
// FIXME factorize this with the output code below
out = h->delayed_pic[0];
out_idx = 0;
for (i = 1;
h->delayed_pic[i] &&
!h->delayed_pic[i]->f.key_frame &&
!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) {
ret = output_frame(h, pict, &out->f);
if (ret < 0)
return ret;
*got_frame = 1;
}
return buf_index;
}
buf_index = decode_nal_units(h, buf, buf_size, 0);
if (buf_index < 0)
return AVERROR_INVALIDDATA;
if (!h->cur_pic_ptr && h->nal_unit_type == NAL_END_SEQUENCE) {
buf_size = 0;
goto out;
}
if (!(avctx->flags2 & CODEC_FLAG2_CHUNKS) && !h->cur_pic_ptr) {
if (avctx->skip_frame >= AVDISCARD_NONREF)
return 0;
av_log(avctx, AV_LOG_ERROR, "no frame!\n");
return AVERROR_INVALIDDATA;
}
if (!(avctx->flags2 & CODEC_FLAG2_CHUNKS) ||
(h->mb_y >= h->mb_height && h->mb_height)) {
if (avctx->flags2 & CODEC_FLAG2_CHUNKS)
decode_postinit(h, 1);
ff_h264_field_end(h, &h->slice_ctx[0], 0);
*got_frame = 0;
if (h->next_output_pic && ((avctx->flags & CODEC_FLAG_OUTPUT_CORRUPT) ||
h->next_output_pic->recovered)) {
if (!h->next_output_pic->recovered)
h->next_output_pic->f.flags |= AV_FRAME_FLAG_CORRUPT;
ret = output_frame(h, pict, &h->next_output_pic->f);
if (ret < 0)
return ret;
*got_frame = 1;
}
}
assert(pict->buf[0] || !*got_frame);
return get_consumed_bytes(buf_index, buf_size);
}
av_cold void ff_h264_free_context(H264Context *h)
{
int i;
ff_h264_free_tables(h, 1); // FIXME cleanup init stuff perhaps
av_freep(&h->slice_ctx);
h->nb_slice_ctx = 0;
for (i = 0; i < MAX_SPS_COUNT; i++)
av_freep(h->sps_buffers + i);
for (i = 0; i < MAX_PPS_COUNT; i++)
av_freep(h->pps_buffers + i);
}
static av_cold int h264_decode_end(AVCodecContext *avctx)
{
H264Context *h = avctx->priv_data;
ff_h264_free_context(h);
ff_h264_unref_picture(h, &h->cur_pic);
return 0;
}
#define OFFSET(x) offsetof(H264Context, x)
#define VD AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_DECODING_PARAM
static const AVOption h264_options[] = {
{ "enable_er", "Enable error resilience on damaged frames (unsafe)", OFFSET(enable_er), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, VD },
{ NULL },
};
static const AVClass h264_class = {
.class_name = "h264",
.item_name = av_default_item_name,
.option = h264_options,
.version = LIBAVUTIL_VERSION_INT,
};
static const AVProfile profiles[] = {
{ FF_PROFILE_H264_BASELINE, "Baseline" },
{ FF_PROFILE_H264_CONSTRAINED_BASELINE, "Constrained Baseline" },
{ FF_PROFILE_H264_MAIN, "Main" },
{ FF_PROFILE_H264_EXTENDED, "Extended" },
{ FF_PROFILE_H264_HIGH, "High" },
{ FF_PROFILE_H264_HIGH_10, "High 10" },
{ FF_PROFILE_H264_HIGH_10_INTRA, "High 10 Intra" },
{ FF_PROFILE_H264_HIGH_422, "High 4:2:2" },
{ FF_PROFILE_H264_HIGH_422_INTRA, "High 4:2:2 Intra" },
{ FF_PROFILE_H264_HIGH_444, "High 4:4:4" },
{ FF_PROFILE_H264_HIGH_444_PREDICTIVE, "High 4:4:4 Predictive" },
{ FF_PROFILE_H264_HIGH_444_INTRA, "High 4:4:4 Intra" },
{ FF_PROFILE_H264_CAVLC_444, "CAVLC 4:4:4" },
{ FF_PROFILE_UNKNOWN },
};
AVCodec ff_h264_decoder = {
.name = "h264",
.long_name = NULL_IF_CONFIG_SMALL("H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10"),
.type = AVMEDIA_TYPE_VIDEO,
.id = AV_CODEC_ID_H264,
.priv_data_size = sizeof(H264Context),
.init = ff_h264_decode_init,
.close = h264_decode_end,
.decode = h264_decode_frame,
.capabilities = /*CODEC_CAP_DRAW_HORIZ_BAND |*/ CODEC_CAP_DR1 |
CODEC_CAP_DELAY | CODEC_CAP_SLICE_THREADS |
CODEC_CAP_FRAME_THREADS,
.flush = flush_dpb,
.init_thread_copy = ONLY_IF_THREADS_ENABLED(decode_init_thread_copy),
.update_thread_context = ONLY_IF_THREADS_ENABLED(ff_h264_update_thread_context),
.profiles = NULL_IF_CONFIG_SMALL(profiles),
.priv_class = &h264_class,
};
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