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Code Issues Releases Activity

apv_decode: Improve reporting of decode errors

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Halt tile component decoding at the first entropy error (this will be a
desync and is not recoverable).  If any tile components contain errors
then discard the frame unless the output-corrupt flag is set.

Also fixes CID 1646764, which is the error case where the tile component
is too large for get_bits to handle.
This commit is contained in:
Mark Thompson
2025-05-03 17:53:22 +01:00
parent 5acd2145a4
commit 1a9a2bafc8
1 changed files with 43 additions and 9 deletions
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40
libavcodec/apv_decode.c
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@ -16,6 +16,8 @@
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <stdatomic.h>
#include "libavutil/mastering_display_metadata.h"
#include "libavutil/mem_internal.h"
#include "libavutil/pixdesc.h"
@ -41,6 +43,7 @@ typedef struct APVDecodeContext {
APVDerivedTileInfo tile_info;
AVFrame *output_frame;
atomic_int tile_errors;
uint8_t warned_additional_frames;
uint8_t warned_unknown_pbu_types;
@ -129,6 +132,8 @@ static av_cold int apv_decode_init(AVCodecContext *avctx)
ff_apv_dsp_init(&apv->dsp);
atomic_init(&apv->tile_errors, 0);
return 0;
}
@ -158,7 +163,7 @@ static int apv_decode_block(AVCodecContext *avctx,
err = ff_apv_entropy_decode_block(coeff, gbc, entropy_state);
if (err < 0)
return 0;
return err;
apv->dsp.decode_transquant(output, pitch,
coeff, qmatrix,
@ -215,8 +220,12 @@ static int apv_decode_tile_component(AVCodecContext *avctx, void *data,
.prev_1st_ac_level = 0,
};
init_get_bits8(&gbc, tile->tile_data[comp_index],
int err;
err = init_get_bits8(&gbc, tile->tile_data[comp_index],
tile->tile_header.tile_data_size[comp_index]);
if (err < 0)
goto fail;
// Combine the bitstream quantisation matrix with the qp scaling
// in advance. (Including qp_shift as well would overflow 16 bits.)
@ -251,12 +260,17 @@ static int apv_decode_tile_component(AVCodecContext *avctx, void *data,
uint8_t *block_start = apv->output_frame->data[comp_index] +
frame_y * frame_pitch + 2 * frame_x;
apv_decode_block(avctx,
err = apv_decode_block(avctx,
block_start, frame_pitch,
&gbc, &entropy_state,
bit_depth,
qp_shift,
qmatrix_scaled);
if (err < 0) {
// Error in block decode means entropy desync,
// so this is not recoverable.
goto fail;
}
}
}
}
@ -268,6 +282,13 @@ static int apv_decode_tile_component(AVCodecContext *avctx, void *data,
tile_start_x, tile_start_y);
return 0;
fail:
av_log(avctx, AV_LOG_VERBOSE,
"Decode error in tile %d component %d.\n",
tile_index, comp_index);
atomic_fetch_add_explicit(&apv->tile_errors, 1, memory_order_relaxed);
return err;
}
static int apv_decode(AVCodecContext *avctx, AVFrame *output,
@ -289,6 +310,7 @@ static int apv_decode(AVCodecContext *avctx, AVFrame *output,
return err;
apv->output_frame = output;
atomic_store_explicit(&apv->tile_errors, 0, memory_order_relaxed);
// Each component within a tile is independent of every other,
// so we can decode all in parallel.
@ -297,6 +319,18 @@ static int apv_decode(AVCodecContext *avctx, AVFrame *output,
avctx->execute2(avctx, apv_decode_tile_component,
input, NULL, job_count);
err = atomic_load_explicit(&apv->tile_errors, memory_order_relaxed);
if (err > 0) {
av_log(avctx, AV_LOG_ERROR,
"Decode errors in %d tile components.\n", err);
if (avctx->flags & AV_CODEC_FLAG_OUTPUT_CORRUPT) {
// Output the frame anyway.
output->flags |= AV_FRAME_FLAG_CORRUPT;
} else {
return AVERROR_INVALIDDATA;
}
}
return 0;
}