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hevc_parser: parse and export some stream parameters 

Particularly those that will be needed by the QSV decoder.
More can be added later as necessary.
This commit is contained in:
Anton Khirnov 2015-07-09 19:34:51 +02:00
parent 7f78155dc6
commit 650060dfb6
3 changed files with 125 additions and 6 deletions
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1
configure vendored
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@ -2057,6 +2057,7 @@ wmv3_vdpau_hwaccel_select="vc1_vdpau_hwaccel"
# parsers
h264_parser_select="h264_decoder"
hevc_parser_select="golomb"
mpegvideo_parser_select="mpegvideo"
mpeg4video_parser_select="error_resilience h263dsp mpeg_er mpegvideo qpeldsp"
vc1_parser_select="mpegvideo startcode vc1_decoder"

2
libavcodec/Makefile
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@ -697,7 +697,7 @@ OBJS-$(CONFIG_GSM_PARSER) += gsm_parser.o
OBJS-$(CONFIG_H261_PARSER) += h261_parser.o
OBJS-$(CONFIG_H263_PARSER) += h263_parser.o
OBJS-$(CONFIG_H264_PARSER) += h264_parser.o
OBJS-$(CONFIG_HEVC_PARSER) += hevc_parser.o
OBJS-$(CONFIG_HEVC_PARSER) += hevc_parser.o hevc_parse.o
OBJS-$(CONFIG_MJPEG_PARSER) += mjpeg_parser.o
OBJS-$(CONFIG_MLP_PARSER) += mlp_parser.o mlp.o
OBJS-$(CONFIG_MPEG4VIDEO_PARSER) += mpeg4video_parser.o h263.o \

128
libavcodec/hevc_parser.c
View File

@ -22,11 +22,99 @@
#include "libavutil/common.h"
#include "parser.h"
#include "golomb.h"
#include "hevc.h"
#include "parser.h"
#define START_CODE 0x000001 ///< start_code_prefix_one_3bytes
#define IS_IRAP_NAL(nal) (nal->type >= 16 && nal->type <= 23)
typedef struct HEVCParserContext {
ParseContext pc;
HEVCPacket pkt;
HEVCParamSets ps;
int parsed_extradata;
} HEVCParserContext;
static int hevc_parse_slice_header(AVCodecParserContext *s, HEVCNAL *nal,
AVCodecContext *avctx)
{
HEVCParserContext *ctx = s->priv_data;
GetBitContext *gb = &nal->gb;
HEVCPPS *pps;
HEVCSPS *sps;
unsigned int pps_id;
get_bits1(gb); // first slice in pic
if (IS_IRAP_NAL(nal))
get_bits1(gb); // no output of prior pics
pps_id = get_ue_golomb_long(gb);
if (pps_id >= MAX_PPS_COUNT || !ctx->ps.pps_list[pps_id]) {
av_log(avctx, AV_LOG_ERROR, "PPS id out of range: %d\n", pps_id);
return AVERROR_INVALIDDATA;
}
pps = (HEVCPPS*)ctx->ps.pps_list[pps_id]->data;
sps = (HEVCSPS*)ctx->ps.sps_list[pps->sps_id]->data;
/* export the stream parameters */
s->coded_width = sps->width;
s->coded_height = sps->height;
s->width = sps->output_width;
s->height = sps->output_height;
s->format = sps->pix_fmt;
avctx->profile = sps->ptl.general_ptl.profile_idc;
avctx->level = sps->ptl.general_ptl.level_idc;
/* ignore the rest for now*/
return 0;
}
static int parse_nal_units(AVCodecParserContext *s, const uint8_t *buf,
int buf_size, AVCodecContext *avctx)
{
HEVCParserContext *ctx = s->priv_data;
int ret, i;
ret = ff_hevc_split_packet(&ctx->pkt, buf, buf_size, avctx, 0, 0);
if (ret < 0)
return ret;
for (i = 0; i < ctx->pkt.nb_nals; i++) {
HEVCNAL *nal = &ctx->pkt.nals[i];
/* ignore everything except parameter sets and VCL NALUs */
switch (nal->type) {
case NAL_VPS: ff_hevc_decode_nal_vps(&nal->gb, avctx, &ctx->ps); break;
case NAL_SPS: ff_hevc_decode_nal_sps(&nal->gb, avctx, &ctx->ps, 1); break;
case NAL_PPS: ff_hevc_decode_nal_pps(&nal->gb, avctx, &ctx->ps); break;
case NAL_TRAIL_R:
case NAL_TRAIL_N:
case NAL_TSA_N:
case NAL_TSA_R:
case NAL_STSA_N:
case NAL_STSA_R:
case NAL_BLA_W_LP:
case NAL_BLA_W_RADL:
case NAL_BLA_N_LP:
case NAL_IDR_W_RADL:
case NAL_IDR_N_LP:
case NAL_CRA_NUT:
case NAL_RADL_N:
case NAL_RADL_R:
case NAL_RASL_N:
case NAL_RASL_R: hevc_parse_slice_header(s, nal, avctx); break;
}
}
return 0;
}
/**
* Find the end of the current frame in the bitstream.
* @return the position of the first byte of the next frame, or END_NOT_FOUND
@ -34,8 +122,9 @@
static int hevc_find_frame_end(AVCodecParserContext *s, const uint8_t *buf,
int buf_size)
{
HEVCParserContext *ctx = s->priv_data;
ParseContext *pc = &ctx->pc;
int i;
ParseContext *pc = s->priv_data;
for (i = 0; i < buf_size; i++) {
int nut;
@ -76,7 +165,14 @@ static int hevc_parse(AVCodecParserContext *s, AVCodecContext *avctx,
const uint8_t *buf, int buf_size)
{
int next;
ParseContext *pc = s->priv_data;
HEVCParserContext *ctx = s->priv_data;
ParseContext *pc = &ctx->pc;
if (avctx->extradata && !ctx->parsed_extradata) {
parse_nal_units(s, avctx->extradata, avctx->extradata_size, avctx);
ctx->parsed_extradata = 1;
}
if (s->flags & PARSER_FLAG_COMPLETE_FRAMES) {
next = buf_size;
@ -89,6 +185,8 @@ static int hevc_parse(AVCodecParserContext *s, AVCodecContext *avctx,
}
}
parse_nal_units(s, buf, buf_size, avctx);
*poutbuf = buf;
*poutbuf_size = buf_size;
return next;
@ -116,10 +214,30 @@ static int hevc_split(AVCodecContext *avctx, const uint8_t *buf, int buf_size)
return 0;
}
static void hevc_parser_close(AVCodecParserContext *s)
{
HEVCParserContext *ctx = s->priv_data;
int i;
for (i = 0; i < FF_ARRAY_ELEMS(ctx->ps.vps_list); i++)
av_buffer_unref(&ctx->ps.vps_list[i]);
for (i = 0; i < FF_ARRAY_ELEMS(ctx->ps.sps_list); i++)
av_buffer_unref(&ctx->ps.sps_list[i]);
for (i = 0; i < FF_ARRAY_ELEMS(ctx->ps.pps_list); i++)
av_buffer_unref(&ctx->ps.pps_list[i]);
for (i = 0; i < ctx->pkt.nals_allocated; i++)
av_freep(&ctx->pkt.nals[i].rbsp_buffer);
av_freep(&ctx->pkt.nals);
ctx->pkt.nals_allocated = 0;
av_freep(&ctx->pc.buffer);
}
AVCodecParser ff_hevc_parser = {
.codec_ids = { AV_CODEC_ID_HEVC },
.priv_data_size = sizeof(ParseContext),
.priv_data_size = sizeof(HEVCParserContext),
.parser_parse = hevc_parse,
.parser_close = ff_parse_close,
.parser_close = hevc_parser_close,
.split = hevc_split,
};