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ffmpeg/libavcodec/vp9_raw_reorder_bsf.c

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/*
* 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
*/
#include "libavutil/avassert.h"
#include "libavutil/intmath.h"
#include "libavutil/log.h"
#include "libavutil/mem.h"
#include "bsf.h"
#include "bsf_internal.h"
#include "get_bits.h"
#include "put_bits.h"
#define FRAME_SLOTS 8
typedef struct VP9RawReorderFrame {
AVPacket *packet;
int needs_output;
int needs_display;
int64_t pts;
int64_t sequence;
unsigned int slots;
unsigned int profile;
unsigned int show_existing_frame;
unsigned int frame_to_show;
unsigned int frame_type;
unsigned int show_frame;
unsigned int refresh_frame_flags;
} VP9RawReorderFrame;
typedef struct VP9RawReorderContext {
int64_t sequence;
VP9RawReorderFrame *slot[FRAME_SLOTS];
VP9RawReorderFrame *next_frame;
} VP9RawReorderContext;
static void vp9_raw_reorder_frame_free(VP9RawReorderFrame **frame)
{
if (*frame)
av_packet_free(&(*frame)->packet);
av_freep(frame);
}
static void vp9_raw_reorder_clear_slot(VP9RawReorderContext *ctx, int s)
{
if (ctx->slot[s]) {
ctx->slot[s]->slots &= ~(1 << s);
if (ctx->slot[s]->slots == 0)
vp9_raw_reorder_frame_free(&ctx->slot[s]);
else
ctx->slot[s] = NULL;
}
}
static int vp9_raw_reorder_frame_parse(AVBSFContext *bsf, VP9RawReorderFrame *frame)
{
GetBitContext bc;
int err;
unsigned int frame_marker;
unsigned int profile_low_bit, profile_high_bit, reserved_zero;
unsigned int error_resilient_mode;
unsigned int frame_sync_code;
err = init_get_bits(&bc, frame->packet->data, 8 * frame->packet->size);
if (err)
return err;
frame_marker = get_bits(&bc, 2);
if (frame_marker != 2) {
av_log(bsf, AV_LOG_ERROR, "Invalid frame marker: %u.\n",
frame_marker);
return AVERROR_INVALIDDATA;
}
profile_low_bit = get_bits1(&bc);
profile_high_bit = get_bits1(&bc);
frame->profile = (profile_high_bit << 1) | profile_low_bit;
if (frame->profile == 3) {
reserved_zero = get_bits1(&bc);
if (reserved_zero != 0) {
av_log(bsf, AV_LOG_ERROR, "Profile reserved_zero bit set: "
"unsupported profile or invalid bitstream.\n");
return AVERROR_INVALIDDATA;
}
}
frame->show_existing_frame = get_bits1(&bc);
if (frame->show_existing_frame) {
frame->frame_to_show = get_bits(&bc, 3);
return 0;
}
frame->frame_type = get_bits1(&bc);
frame->show_frame = get_bits1(&bc);
error_resilient_mode = get_bits1(&bc);
if (frame->frame_type == 0) {
frame_sync_code = get_bits(&bc, 24);
if (frame_sync_code != 0x498342) {
av_log(bsf, AV_LOG_ERROR, "Invalid frame sync code: %06x.\n",
frame_sync_code);
return AVERROR_INVALIDDATA;
}
frame->refresh_frame_flags = 0xff;
} else {
unsigned int intra_only;
if (frame->show_frame == 0)
intra_only = get_bits1(&bc);
else
intra_only = 0;
if (error_resilient_mode == 0) {
// reset_frame_context
skip_bits(&bc, 2);
}
if (intra_only) {
frame_sync_code = get_bits(&bc, 24);
if (frame_sync_code != 0x498342) {
av_log(bsf, AV_LOG_ERROR, "Invalid frame sync code: "
"%06x.\n", frame_sync_code);
return AVERROR_INVALIDDATA;
}
if (frame->profile > 0) {
unsigned int color_space;
if (frame->profile >= 2) {
// ten_or_twelve_bit
skip_bits(&bc, 1);
}
color_space = get_bits(&bc, 3);
if (color_space != 7 /* CS_RGB */) {
// color_range
skip_bits(&bc, 1);
if (frame->profile == 1 || frame->profile == 3) {
// subsampling
skip_bits(&bc, 3);
}
} else {
if (frame->profile == 1 || frame->profile == 3)
skip_bits(&bc, 1);
}
}
frame->refresh_frame_flags = get_bits(&bc, 8);
} else {
frame->refresh_frame_flags = get_bits(&bc, 8);
}
}
return 0;
}
static int vp9_raw_reorder_make_output(AVBSFContext *bsf,
AVPacket *out,
VP9RawReorderFrame *last_frame)
{
VP9RawReorderContext *ctx = bsf->priv_data;
VP9RawReorderFrame *next_output = last_frame,
*next_display = last_frame, *frame;
int s, err;
for (s = 0; s < FRAME_SLOTS; s++) {
frame = ctx->slot[s];
if (!frame)
continue;
if (frame->needs_output && (!next_output ||
frame->sequence < next_output->sequence))
next_output = frame;
if (frame->needs_display && (!next_display ||
frame->pts < next_display->pts))
next_display = frame;
}
if (!next_output && !next_display)
return AVERROR_EOF;
if (!next_display || (next_output &&
next_output->sequence < next_display->sequence))
frame = next_output;
else
frame = next_display;
if (frame->needs_output && frame->needs_display &&
next_output == next_display) {
av_log(bsf, AV_LOG_DEBUG, "Output and display frame "
"%"PRId64" (%"PRId64") in order.\n",
frame->sequence, frame->pts);
av_packet_move_ref(out, frame->packet);
frame->needs_output = frame->needs_display = 0;
} else if (frame->needs_output) {
if (frame->needs_display) {
av_log(bsf, AV_LOG_DEBUG, "Output frame %"PRId64" "
"(%"PRId64") for later display.\n",
frame->sequence, frame->pts);
} else {
av_log(bsf, AV_LOG_DEBUG, "Output unshown frame "
"%"PRId64" (%"PRId64") to keep order.\n",
frame->sequence, frame->pts);
}
av_packet_move_ref(out, frame->packet);
out->pts = out->dts;
frame->needs_output = 0;
} else {
PutBitContext pb;
av_assert0(!frame->needs_output && frame->needs_display);
if (frame->slots == 0) {
av_log(bsf, AV_LOG_ERROR, "Attempting to display frame "
"which is no longer available?\n");
frame->needs_display = 0;
return AVERROR_INVALIDDATA;
}
s = ff_ctz(frame->slots);
av_assert0(s < FRAME_SLOTS);
av_log(bsf, AV_LOG_DEBUG, "Display frame %"PRId64" "
"(%"PRId64") from slot %d.\n",
frame->sequence, frame->pts, s);
err = av_new_packet(out, 2);
if (err < 0)
return err;
init_put_bits(&pb, out->data, 2);
// frame_marker
put_bits(&pb, 2, 2);
// profile_low_bit
put_bits(&pb, 1, frame->profile & 1);
// profile_high_bit
put_bits(&pb, 1, (frame->profile >> 1) & 1);
if (frame->profile == 3) {
// reserved_zero
put_bits(&pb, 1, 0);
}
// show_existing_frame
put_bits(&pb, 1, 1);
// frame_to_show_map_idx
put_bits(&pb, 3, s);
while (put_bits_count(&pb) < 16)
put_bits(&pb, 1, 0);
flush_put_bits(&pb);
out->pts = out->dts = frame->pts;
frame->needs_display = 0;
}
return 0;
}
static int vp9_raw_reorder_filter(AVBSFContext *bsf, AVPacket *out)
{
VP9RawReorderContext *ctx = bsf->priv_data;
VP9RawReorderFrame *frame;
AVPacket *in;
int err, s;
if (ctx->next_frame) {
frame = ctx->next_frame;
} else {
err = ff_bsf_get_packet(bsf, &in);
if (err < 0) {
if (err == AVERROR_EOF)
return vp9_raw_reorder_make_output(bsf, out, NULL);
return err;
}
if (!in->size) {
av_packet_free(&in);
return AVERROR_INVALIDDATA;
}
if ((in->data[in->size - 1] & 0xe0) == 0xc0) {
av_log(bsf, AV_LOG_ERROR, "Input in superframes is not "
"supported.\n");
av_packet_free(&in);
return AVERROR(ENOSYS);
}
frame = av_mallocz(sizeof(*frame));
if (!frame) {
av_packet_free(&in);
return AVERROR(ENOMEM);
}
frame->packet = in;
frame->pts = in->pts;
frame->sequence = ++ctx->sequence;
err = vp9_raw_reorder_frame_parse(bsf, frame);
if (err) {
av_log(bsf, AV_LOG_ERROR, "Failed to parse input "
"frame: %d.\n", err);
goto fail;
}
frame->needs_output = 1;
frame->needs_display = frame->pts != AV_NOPTS_VALUE;
if (frame->show_existing_frame)
av_log(bsf, AV_LOG_DEBUG, "Show frame %"PRId64" "
"(%"PRId64"): show %u.\n", frame->sequence,
frame->pts, frame->frame_to_show);
else
av_log(bsf, AV_LOG_DEBUG, "New frame %"PRId64" "
"(%"PRId64"): type %u show %u refresh %02x.\n",
frame->sequence, frame->pts, frame->frame_type,
frame->show_frame, frame->refresh_frame_flags);
ctx->next_frame = frame;
}
for (s = 0; s < FRAME_SLOTS; s++) {
if (!(frame->refresh_frame_flags & (1 << s)))
continue;
if (ctx->slot[s] && ctx->slot[s]->needs_display &&
ctx->slot[s]->slots == (1 << s)) {
// We are overwriting this slot, which is last reference
// to the frame previously present in it. In order to be
// a valid stream, that frame must already have been
// displayed before the pts of the current frame.
err = vp9_raw_reorder_make_output(bsf, out, ctx->slot[s]);
if (err < 0) {
av_log(bsf, AV_LOG_ERROR, "Failed to create "
"output overwriting slot %d: %d.\n",
s, err);
// Clear the slot anyway, so we don't end up
// in an infinite loop.
vp9_raw_reorder_clear_slot(ctx, s);
return AVERROR_INVALIDDATA;
}
return 0;
}
vp9_raw_reorder_clear_slot(ctx, s);
}
for (s = 0; s < FRAME_SLOTS; s++) {
if (!(frame->refresh_frame_flags & (1 << s)))
continue;
ctx->slot[s] = frame;
}
frame->slots = frame->refresh_frame_flags;
if (!frame->refresh_frame_flags) {
err = vp9_raw_reorder_make_output(bsf, out, frame);
if (err < 0) {
av_log(bsf, AV_LOG_ERROR, "Failed to create output "
"for transient frame.\n");
ctx->next_frame = NULL;
return AVERROR_INVALIDDATA;
}
if (!frame->needs_display) {
vp9_raw_reorder_frame_free(&frame);
ctx->next_frame = NULL;
}
return 0;
}
ctx->next_frame = NULL;
return AVERROR(EAGAIN);
fail:
vp9_raw_reorder_frame_free(&frame);
return err;
}
static av_cold void vp9_raw_reorder_flush_close(AVBSFContext *bsf)
{
VP9RawReorderContext *ctx = bsf->priv_data;
for (int s = 0; s < FRAME_SLOTS; s++)
vp9_raw_reorder_clear_slot(ctx, s);
vp9_raw_reorder_frame_free(&ctx->next_frame);
ctx->sequence = 0;
}
static const enum AVCodecID vp9_raw_reorder_codec_ids[] = {
AV_CODEC_ID_VP9, AV_CODEC_ID_NONE,
};
const FFBitStreamFilter ff_vp9_raw_reorder_bsf = {
.p.name = "vp9_raw_reorder",
.p.codec_ids = vp9_raw_reorder_codec_ids,
.priv_data_size = sizeof(VP9RawReorderContext),
.filter = &vp9_raw_reorder_filter,
.flush = &vp9_raw_reorder_flush_close,
.close = &vp9_raw_reorder_flush_close,
};
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