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h264: switch to h2645_parse for NAL parsing

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This commit is contained in:
Anton Khirnov
2016-03-21 14:35:48 +01:00
parent a7829a2a3f
commit ca2f19b9cc
3 changed files with 150 additions and 291 deletions
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3
libavcodec/Makefile
View File

@@ -252,7 +252,8 @@ OBJS-$(CONFIG_H264_DECODER) += h264.o h264_cabac.o h264_cavlc.o \
h264_direct.o h264_loopfilter.o \
h264_mb.o h264_picture.o h264_ps.o \
h264_refs.o h264_sei.o \
h264_slice.o h264data.o h264_parse.o
h264_slice.o h264data.o h264_parse.o \
h2645_parse.o
OBJS-$(CONFIG_H264_MMAL_DECODER) += mmaldec.o
OBJS-$(CONFIG_H264_NVENC_ENCODER) += nvenc_h264.o
OBJS-$(CONFIG_H264_QSV_DECODER) += qsvdec_h2645.o

247
libavcodec/h264.c
View File

@@ -38,6 +38,7 @@
#include "error_resilience.h"
#include "avcodec.h"
#include "h264.h"
#include "h2645_parse.h"
#include "h264data.h"
#include "h264chroma.h"
#include "h264_mvpred.h"
@@ -221,25 +222,6 @@ nsc:
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;
ff_tlog(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 i;
@@ -1143,113 +1125,30 @@ int ff_set_ref_count(H264Context *h, H264SliceContext *sl)
return 0;
}
static int find_start_code(const uint8_t *buf, int buf_size,
int buf_index, int next_avc)
static int get_last_needed_nal(H264Context *h)
{
// 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) {
// the end of the buffer is reached, refill it.
return AVERROR(EAGAIN);
}
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 AVERROR_INVALIDDATA;
}
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;
int i;
while(1) {
for (i = 0; i < h->pkt.nb_nals; i++) {
H2645NAL *nal = &h->pkt.nals[i];
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) {
switch (nal->type) {
case NAL_SPS:
case NAL_PPS:
nals_needed = nal_index;
nals_needed = i;
break;
case NAL_DPA:
case NAL_IDR_SLICE:
case NAL_SLICE:
init_get_bits(&gb, ptr, bit_length);
init_get_bits(&gb, nal->data + 1, (nal->size - 1) * 8);
if (!get_ue_golomb(&gb))
nals_needed = nal_index;
nals_needed = i;
}
}
@@ -1260,13 +1159,9 @@ 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;
unsigned context_count = 0;
int nals_needed = 0; ///< number of NALs that need decoding before the next frame thread starts
int nal_index;
int ret = 0;
int i, ret = 0;
h->max_contexts = h->slice_context_count;
if (!(avctx->flags2 & AV_CODEC_FLAG2_CHUNKS)) {
@@ -1276,63 +1171,24 @@ static int decode_nal_units(H264Context *h, const uint8_t *buf, int buf_size,
ff_h264_reset_sei(h);
}
if (avctx->active_thread_type & FF_THREAD_FRAME)
nals_needed = get_last_needed_nal(h, buf, buf_size);
ret = ff_h2645_packet_split(&h->pkt, buf, buf_size, avctx, h->is_avc,
h->nal_length_size, avctx->codec_id);
if (ret < 0) {
av_log(avctx, AV_LOG_ERROR,
"Error splitting the input into NAL units.\n");
return ret;
}
{
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;
if (avctx->active_thread_type & FF_THREAD_FRAME)
nals_needed = get_last_needed_nal(h);
for (i = 0; i < h->pkt.nb_nals; i++) {
H2645NAL *nal = &h->pkt.nals[i];
H264SliceContext *sl = &h->slice_ctx[context_count];
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)
nal->ref_idc == 0 && nal->type != NAL_SEI)
continue;
again:
@@ -1341,19 +1197,22 @@ again:
* 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)
(nal->type != NAL_PPS && nal->type != NAL_SPS)) {
if (nal->type < NAL_AUD || nal->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;
nal->type);
nal->type = NAL_FF_IGNORE;
}
// FIXME these should stop being context-global variables
h->nal_ref_idc = nal->ref_idc;
h->nal_unit_type = nal->type;
err = 0;
switch (h->nal_unit_type) {
switch (nal->type) {
case NAL_IDR_SLICE:
if (h->nal_unit_type != NAL_IDR_SLICE) {
if (nal->type != NAL_IDR_SLICE) {
av_log(h->avctx, AV_LOG_ERROR,
"Invalid mix of idr and non-idr slices\n");
ret = -1;
@@ -1361,7 +1220,7 @@ again:
}
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);
sl->gb = nal->gb;
if ((err = ff_h264_decode_slice_header(h, sl)))
break;
@@ -1372,23 +1231,21 @@ again:
}
h->cur_pic_ptr->f->key_frame |=
(h->nal_unit_type == NAL_IDR_SLICE) ||
(h->sei_recovery_frame_cnt >= 0);
(nal->type == NAL_IDR_SLICE) || (h->sei_recovery_frame_cnt >= 0);
if (h->nal_unit_type == NAL_IDR_SLICE ||
h->recovery_frame == h->frame_num) {
if (nal->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)
if (nal->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 & AV_CODEC_FLAG2_CHUNKS))
decode_postinit(h, nal_index >= nals_needed);
decode_postinit(h, i >= nals_needed);
if (h->avctx->hwaccel &&
(ret = h->avctx->hwaccel->start_frame(h->avctx, NULL, 0)) < 0)
@@ -1396,17 +1253,14 @@ again:
}
if (sl->redundant_pic_count == 0 &&
(avctx->skip_frame < AVDISCARD_NONREF ||
h->nal_ref_idc) &&
(avctx->skip_frame < AVDISCARD_NONREF || nal->ref_idc) &&
(avctx->skip_frame < AVDISCARD_BIDIR ||
sl->slice_type_nos != AV_PICTURE_TYPE_B) &&
(avctx->skip_frame < AVDISCARD_NONKEY ||
h->cur_pic_ptr->f->key_frame) &&
avctx->skip_frame < AVDISCARD_ALL) {
if (avctx->hwaccel) {
ret = avctx->hwaccel->decode_slice(avctx,
&buf[buf_index - consumed],
consumed);
ret = avctx->hwaccel->decode_slice(avctx, nal->raw_data, nal->raw_size);
if (ret < 0)
return ret;
} else
@@ -1421,20 +1275,20 @@ again:
goto end;
break;
case NAL_SEI:
init_get_bits(&h->gb, ptr, bit_length);
h->gb = nal->gb;
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);
h->gb = nal->gb;
ret = ff_h264_decode_seq_parameter_set(h);
if (ret < 0 && (h->avctx->err_recognition & AV_EF_EXPLODE))
goto end;
break;
case NAL_PPS:
init_get_bits(&h->gb, ptr, bit_length);
ret = ff_h264_decode_picture_parameter_set(h, bit_length);
h->gb = nal->gb;
ret = ff_h264_decode_picture_parameter_set(h, nal->size_bits);
if (ret < 0 && (h->avctx->err_recognition & AV_EF_EXPLODE))
goto end;
break;
@@ -1449,7 +1303,7 @@ again:
break;
default:
av_log(avctx, AV_LOG_DEBUG, "Unknown NAL code: %d (%d bits)\n",
h->nal_unit_type, bit_length);
nal->type, nal->size_bits);
}
if (context_count == h->max_contexts) {
@@ -1470,7 +1324,6 @@ again:
goto again;
}
}
}
if (context_count) {
ret = ff_h264_execute_decode_slices(h, context_count);
if (ret < 0 && (h->avctx->err_recognition & AV_EF_EXPLODE))
@@ -1485,7 +1338,7 @@ end:
h->picture_structure == PICT_BOTTOM_FIELD);
}
return (ret < 0) ? ret : buf_index;
return (ret < 0) ? ret : buf_size;
}
/**
@@ -1632,6 +1485,8 @@ av_cold void ff_h264_free_context(H264Context *h)
for (i = 0; i < MAX_PPS_COUNT; i++)
av_freep(h->pps_buffers + i);
ff_h2645_packet_uninit(&h->pkt);
}
static av_cold int h264_decode_end(AVCodecContext *avctx)

3
libavcodec/h264.h
View File

@@ -34,6 +34,7 @@
#include "error_resilience.h"
#include "get_bits.h"
#include "h264_parse.h"
#include "h2645_parse.h"
#include "h264chroma.h"
#include "h264dsp.h"
#include "h264pred.h"
@@ -471,6 +472,8 @@ typedef struct H264Context {
H264SliceContext *slice_ctx;
int nb_slice_ctx;
H2645Packet pkt;
int pixel_shift; ///< 0 for 8-bit H264, 1 for high-bit-depth H264
/* coded dimensions -- 16 * mb w/h */