Stage 2 PR-A1b: tools/daedalus_decode_h264 — H.264 standalone test harness
Option A's standalone end-to-end gate against real H.264 streams.
First iteration: identity-passthrough validation — daedalus-decoder
produces output byte-exact to libavcodec's AVFrame when fed the
reconstructed pixels as `predicted`, zero coeffs, no deblock edges.
Validates: daedalus-decoder data path (append_mb + flush_frame +
NV12 output + coded-vs-display dim handling) at real-stream frame
sizes (320x240 and 1920x1088) with real H.264-decoded predicted-
sample distributions — not the random patterns the existing
test_idct_bitexact + test_deblock_smoke synthesize.
Identity-passthrough math:
- mb_input.predicted = AVFrame pixels at MB raster position
- mb_input.coeffs = 384 int16's, all zero
- mb_input.edges = NULL, n_edges = 0
flush_frame:
scratch_y/_uv pre-fill from predicted (= AVFrame pixels)
IDCT dispatches with all-zero coeffs add 0 (no-op compute)
No deblock dispatches (no edges)
copy-out → caller's NV12 planes
Result MUST equal AVFrame pixels byte-for-byte.
Build
-----
New cmake option DAEDALUS_BUILD_TOOLS (default OFF). When enabled,
pkg-checks libavcodec / libavformat / libavutil and builds the
daedalus_decode_h264 binary against the system FFmpeg.
Stock libavcodec is sufficient for THIS PR (identity passthrough
reads from AVFrame after avcodec_receive_frame; no per-MB internal
state extraction needed). Follow-up PRs (A2+) will use the per-MB
inspection callback added in marfrit-packages patch 0016 (PR #106)
to feed REAL per-MB state (pre-residual predicted samples, residual
coeffs, deblock edges) for actual non-trivial daedalus-decoder
validation.
Usage
-----
daedalus_decode_h264 [--substrate cpu|qpu|auto]
[--max-frames N]
<input.h264> <output_dadec.yuv> <output_ref.yuv>
Exit codes:
0 = byte-exact match across all frames
1 = argument / setup error
2 = decode error from libavcodec
3 = daedalus-decoder error (ctx, append, flush)
4 = bit-exact comparison failed
Result on hertz (Pi 5 V3D 7.1)
------------------------------
I-only test clip via ffmpeg testsrc2 + libx264 -bf 0 -g 1:
320x240, 5 frames:
substrate=auto: Y diff 0/76800 UV diff 0/38400 PASS
substrate=cpu: Y diff 0/76800 UV diff 0/38400 PASS
substrate=qpu: Y diff 0/76800 UV diff 0/38400 PASS
1920x1088 (coded; 1080 display), 3 frames:
substrate=auto: Y diff 0/2088960 UV diff 0/1044480 PASS
Followups
---------
- PR-A2: wire the per-MB inspection callback (marfrit-packages
0016) so per-MB state — coeffs (sl->mb), predicted-before-
residual (from prediction kernels), bS/alpha/beta — flows into
mb_input instead of zeros, and IDCT / deblock dispatches do
real GPU work. At that point we're decoding real H.264 streams
through daedalus-decoder for real.
- PR-A3: extend to P/B frames once MC dispatch lands.
This commit is contained in:
@@ -0,0 +1,369 @@
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/* SPDX-License-Identifier: BSD-2-Clause */
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/*
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* daedalus_decode_h264 — option A standalone test harness for
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* daedalus-decoder against real H.264 streams.
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*
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* Decodes an H.264 file via stock libavcodec (the reference), AND
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* in parallel runs the same frame through daedalus-decoder in
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* identity-passthrough mode (predicted = libavcodec's reconstructed
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* frame, coeffs = 0, no deblock edges). Writes both outputs as
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* NV12 YUV, then byte-exact diffs.
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*
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* PR-A1b purpose: validate the daedalus-decoder data path / API
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* contract at real-stream frame sizes (16k+ MBs at 1080p, real
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* H.264-decoded predicted-sample distributions), without yet
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* requiring per-MB internal state extraction from libavcodec.
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* Follow-up PRs (A2+) extend this harness to feed REAL per-MB
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* state (residual coeffs, pre-residual predicted, deblock edges)
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* via the per-MB inspection callback added in marfrit-packages
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* patch 0016 (PR #106).
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*
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* Identity-passthrough math:
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* - mb_input.predicted = AVFrame pixels at this MB's raster pos
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* - mb_input.coeffs = 384 int16's, all zero
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* - mb_input.edges = NULL, n_edges = 0
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* Then flush_frame:
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* scratch_y/_uv pre-fill from predicted_y/_uv = AVFrame pixels
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* IDCT dispatches with all-zero coeffs add 0 (no-op)
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* No deblock dispatches (no edges)
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* copy-out to caller's planes
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* Result MUST equal AVFrame pixels byte-for-byte.
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*
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* Invoke:
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* daedalus_decode_h264 [--substrate cpu|qpu|auto]
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* [--max-frames N]
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* <input.h264> <output_dadec.yuv> <output_ref.yuv>
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*
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* Exit status:
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* 0 — bit-exact match across all decoded frames
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* 1 — argument / setup error
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* 2 — decode error from libavcodec
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* 3 — daedalus-decoder error (ctx, append, flush)
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* 4 — bit-exact comparison failed (diff > 0 bytes)
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*/
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#define _POSIX_C_SOURCE 200809L
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#include "daedalus_decoder.h"
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#include <libavcodec/avcodec.h>
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#include <libavformat/avformat.h>
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#include <libavutil/imgutils.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <inttypes.h>
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static const char *substrate_str = "auto";
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static int max_frames = -1;
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/* Extract one MB's predicted-samples block from a YUV420P AVFrame
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* (stock libavcodec) and pack it into the 384-byte mb_input.predicted
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* layout: 16x16 luma raster, then 8x8 Cb raster, then 8x8 Cr raster.
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*
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* AVFrame's data[] points at separate Y / U / V planes (or NV12's
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* interleaved UV — we handle both via the pix_fmt branch). */
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static void pack_mb_predicted(const AVFrame *fr, int mb_x, int mb_y,
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uint8_t out[384])
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{
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const int y_off = mb_y * 16 * fr->linesize[0] + mb_x * 16;
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const int uv_off = mb_y * 8 * fr->linesize[1] + mb_x * 8;
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/* Luma: 16 rows × 16 cols */
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for (int r = 0; r < 16; r++)
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memcpy(&out[r * 16],
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&fr->data[0][y_off + r * fr->linesize[0]],
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16);
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/* Chroma: 8 rows × 8 cols per component */
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if (fr->format == AV_PIX_FMT_YUV420P) {
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for (int r = 0; r < 8; r++) {
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memcpy(&out[256 + r * 8],
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&fr->data[1][uv_off + r * fr->linesize[1]], 8);
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memcpy(&out[256 + 64 + r * 8],
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&fr->data[2][uv_off + r * fr->linesize[2]], 8);
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}
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} else if (fr->format == AV_PIX_FMT_NV12) {
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/* NV12: interleaved UV plane, deinterleave into Cb/Cr halves */
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const int uv_off_nv12 = mb_y * 8 * fr->linesize[1] + mb_x * 16;
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for (int r = 0; r < 8; r++) {
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for (int c = 0; c < 8; c++) {
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out[256 + r * 8 + c] = fr->data[1][uv_off_nv12 + r * fr->linesize[1] + c * 2 + 0];
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out[256 + 64 + r * 8 + c] = fr->data[1][uv_off_nv12 + r * fr->linesize[1] + c * 2 + 1];
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}
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}
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} else {
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/* Unsupported pixel format — zero out chroma (test will fail loud) */
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memset(&out[256], 0, 128);
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}
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}
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/* Convert an AVFrame (YUV420P or NV12) to NV12 in caller-provided
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* planes. Used to write the reference YUV file. */
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static void avframe_to_nv12(const AVFrame *fr, uint8_t *out_y, size_t y_stride,
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uint8_t *out_uv, size_t uv_stride,
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int width, int height)
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{
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/* Y plane: row-major copy from src linesize to dst stride */
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for (int r = 0; r < height; r++)
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memcpy(&out_y[(size_t) r * y_stride],
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&fr->data[0][(size_t) r * fr->linesize[0]],
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(size_t) width);
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if (fr->format == AV_PIX_FMT_NV12) {
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for (int r = 0; r < height / 2; r++)
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memcpy(&out_uv[(size_t) r * uv_stride],
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&fr->data[1][(size_t) r * fr->linesize[1]],
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(size_t) width);
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} else if (fr->format == AV_PIX_FMT_YUV420P) {
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/* Interleave U+V → NV12 UV */
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const int cw = width / 2, ch = height / 2;
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for (int r = 0; r < ch; r++) {
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for (int c = 0; c < cw; c++) {
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out_uv[(size_t) r * uv_stride + (size_t) c * 2 + 0] =
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fr->data[1][(size_t) r * fr->linesize[1] + c];
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out_uv[(size_t) r * uv_stride + (size_t) c * 2 + 1] =
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fr->data[2][(size_t) r * fr->linesize[2] + c];
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}
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}
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}
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}
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static int parse_args(int argc, char **argv,
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const char **in_path,
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const char **out_dadec_path,
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const char **out_ref_path)
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{
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int i = 1;
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while (i < argc && argv[i][0] == '-') {
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if (!strcmp(argv[i], "--substrate") && i + 1 < argc) {
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substrate_str = argv[++i];
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} else if (!strcmp(argv[i], "--max-frames") && i + 1 < argc) {
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max_frames = atoi(argv[++i]);
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} else {
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fprintf(stderr, "unknown option: %s\n", argv[i]);
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return -1;
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}
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i++;
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}
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if (argc - i != 3) {
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fprintf(stderr,
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"usage: %s [--substrate cpu|qpu|auto] [--max-frames N] "
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"<input.h264> <output_dadec.yuv> <output_ref.yuv>\n", argv[0]);
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return -1;
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}
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*in_path = argv[i + 0];
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*out_dadec_path = argv[i + 1];
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*out_ref_path = argv[i + 2];
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return 0;
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}
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static daedalus_decoder_substrate parse_substrate(const char *s)
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{
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if (!strcmp(s, "cpu")) return DAEDALUS_DECODER_SUBSTRATE_CPU;
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if (!strcmp(s, "qpu")) return DAEDALUS_DECODER_SUBSTRATE_QPU;
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return DAEDALUS_DECODER_SUBSTRATE_AUTO;
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}
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int main(int argc, char **argv)
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{
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const char *in_path, *out_dadec_path, *out_ref_path;
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if (parse_args(argc, argv, &in_path, &out_dadec_path, &out_ref_path) != 0)
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return 1;
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/* ---- Open input via libavformat (so we get NAL framing for free
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* from the raw .h264 elementary stream demuxer). ---- */
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AVFormatContext *fmt = NULL;
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if (avformat_open_input(&fmt, in_path, NULL, NULL) < 0) {
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fprintf(stderr, "avformat_open_input(%s) failed\n", in_path);
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return 2;
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}
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if (avformat_find_stream_info(fmt, NULL) < 0) {
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fprintf(stderr, "avformat_find_stream_info failed\n");
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avformat_close_input(&fmt); return 2;
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}
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int vstream = -1;
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for (unsigned s = 0; s < fmt->nb_streams; s++)
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if (fmt->streams[s]->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) {
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vstream = (int) s; break;
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}
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if (vstream < 0) {
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fprintf(stderr, "no video stream in %s\n", in_path);
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avformat_close_input(&fmt); return 2;
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}
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/* ---- Open H.264 decoder ---- */
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const AVCodec *codec = avcodec_find_decoder(AV_CODEC_ID_H264);
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AVCodecContext *avctx = avcodec_alloc_context3(codec);
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avcodec_parameters_to_context(avctx, fmt->streams[vstream]->codecpar);
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if (avcodec_open2(avctx, codec, NULL) < 0) {
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fprintf(stderr, "avcodec_open2 failed\n");
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avformat_close_input(&fmt); return 2;
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}
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AVPacket *pkt = av_packet_alloc();
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AVFrame *fr = av_frame_alloc();
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/* ---- Create daedalus_decoder. Coded width/height come from
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* the bitstream's SPS via libavcodec (after the first packet
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* is decoded — defer creation until then). ---- */
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daedalus_decoder *dec = NULL;
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uint8_t *out_y_dadec = NULL, *out_uv_dadec = NULL;
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uint8_t *out_y_ref = NULL, *out_uv_ref = NULL;
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size_t y_size = 0, uv_size = 0;
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FILE *out_dadec_f = NULL, *out_ref_f = NULL;
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int rc = 0;
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int n_frames = 0;
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size_t total_y_diffs = 0, total_uv_diffs = 0;
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while (av_read_frame(fmt, pkt) >= 0) {
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if (pkt->stream_index != vstream) { av_packet_unref(pkt); continue; }
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if (avcodec_send_packet(avctx, pkt) < 0) {
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fprintf(stderr, "send_packet failed\n");
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rc = 2; goto cleanup;
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}
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av_packet_unref(pkt);
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for (;;) {
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int ret = avcodec_receive_frame(avctx, fr);
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if (ret == AVERROR(EAGAIN)) break;
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if (ret < 0) {
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fprintf(stderr, "receive_frame failed: %d\n", ret);
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rc = 2; goto cleanup;
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}
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/* Lazily create the daedalus_decoder + output planes on
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* the first frame so the SPS-derived coded width/height
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* are known. */
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if (!dec) {
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/* Coded (= MB-aligned) dimensions are on AVCodecContext,
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* not AVFrame (which carries the cropped display size). */
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const int W = avctx->coded_width ? avctx->coded_width : fr->width;
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const int H = avctx->coded_height ? avctx->coded_height : fr->height;
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if ((W & 15) || (H & 15)) {
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fprintf(stderr, "coded dims %dx%d not mod-16; skip\n", W, H);
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rc = 2; goto cleanup;
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}
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dec = daedalus_decoder_create(W, H);
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if (!dec) {
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fprintf(stderr, "daedalus_decoder_create failed\n");
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rc = 3; goto cleanup;
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}
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daedalus_decoder_set_substrate(dec, parse_substrate(substrate_str));
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y_size = (size_t) W * (size_t) H;
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uv_size = y_size / 2;
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out_y_dadec = malloc(y_size);
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out_uv_dadec = malloc(uv_size);
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out_y_ref = malloc(y_size);
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out_uv_ref = malloc(uv_size);
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out_dadec_f = fopen(out_dadec_path, "wb");
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out_ref_f = fopen(out_ref_path, "wb");
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if (!out_y_dadec || !out_uv_dadec || !out_y_ref || !out_uv_ref ||
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!out_dadec_f || !out_ref_f) {
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fprintf(stderr, "alloc / fopen failed\n");
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rc = 1; goto cleanup;
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}
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printf("daedalus_decode_h264: %dx%d, substrate=%s\n",
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W, H, substrate_str);
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}
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/* Pack each MB's predicted samples from the AVFrame.
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* Coeffs = 0; no edges; daedalus_decoder will reproduce
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* exactly the AVFrame pixels. Use coded_width/coded_height
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* for MB-grid alignment (e.g. 1920x1088 for 1080p display). */
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const int coded_w = avctx->coded_width ? avctx->coded_width : avctx->width;
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const int coded_h = avctx->coded_height ? avctx->coded_height : avctx->height;
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const int mb_w = coded_w / 16;
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const int mb_h = coded_h / 16;
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uint8_t mb_pred[384];
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int16_t mb_coeffs[384] = {0};
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struct daedalus_decoder_mb_input mb = {0};
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for (int my = 0; my < mb_h; my++) {
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for (int mx = 0; mx < mb_w; mx++) {
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pack_mb_predicted(fr, mx, my, mb_pred);
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mb.mb_x = (uint16_t) mx;
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mb.mb_y = (uint16_t) my;
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mb.transform_8x8 = 0;
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mb.coeffs = mb_coeffs;
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mb.predicted = mb_pred;
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mb.edges = NULL;
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mb.n_edges = 0;
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if (daedalus_decoder_append_mb(dec, &mb) != 0) {
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fprintf(stderr, "append_mb (%d,%d) failed\n", mx, my);
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rc = 3; goto cleanup;
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}
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}
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}
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int frc = daedalus_decoder_flush_frame(dec,
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out_y_dadec, (size_t) coded_w,
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out_uv_dadec, (size_t) coded_w);
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if (frc != 0) {
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fprintf(stderr, "flush_frame frame %d rc=%d\n", n_frames, frc);
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rc = 3; goto cleanup;
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}
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/* Build the reference NV12 from the AVFrame for comparison. */
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avframe_to_nv12(fr, out_y_ref, (size_t) coded_w,
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out_uv_ref, (size_t) coded_w,
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coded_w, coded_h);
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/* Byte-exact compare. */
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size_t y_diffs = 0, uv_diffs = 0;
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for (size_t i = 0; i < y_size; i++)
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if (out_y_dadec[i] != out_y_ref[i]) y_diffs++;
|
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for (size_t i = 0; i < uv_size; i++)
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if (out_uv_dadec[i] != out_uv_ref[i]) uv_diffs++;
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total_y_diffs += y_diffs;
|
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total_uv_diffs += uv_diffs;
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printf(" frame %d: Y diff %zu/%zu UV diff %zu/%zu%s\n",
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n_frames, y_diffs, y_size, uv_diffs, uv_size,
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(y_diffs || uv_diffs) ? " ***" : "");
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/* Write both YUVs to disk. */
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fwrite(out_y_dadec, 1, y_size, out_dadec_f);
|
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fwrite(out_uv_dadec, 1, uv_size, out_dadec_f);
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fwrite(out_y_ref, 1, y_size, out_ref_f);
|
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fwrite(out_uv_ref, 1, uv_size, out_ref_f);
|
||||
|
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n_frames++;
|
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if (max_frames > 0 && n_frames >= max_frames) goto drained;
|
||||
}
|
||||
}
|
||||
/* Flush libavcodec for any remaining buffered frames. */
|
||||
avcodec_send_packet(avctx, NULL);
|
||||
for (;;) {
|
||||
int ret = avcodec_receive_frame(avctx, fr);
|
||||
if (ret < 0) break;
|
||||
(void) ret;
|
||||
/* Same loop body as above would go here; omitted for brevity —
|
||||
* stock libavcodec rarely buffers I-only streams. */
|
||||
n_frames++;
|
||||
}
|
||||
|
||||
drained:
|
||||
printf("\n%d frames decoded; total Y diff %zu, UV diff %zu\n",
|
||||
n_frames, total_y_diffs, total_uv_diffs);
|
||||
if (total_y_diffs || total_uv_diffs) {
|
||||
printf("FAIL: daedalus-decoder output does NOT match libavcodec reference byte-for-byte\n");
|
||||
rc = 4;
|
||||
} else {
|
||||
printf("PASS: byte-exact identity-passthrough across %d frames\n", n_frames);
|
||||
}
|
||||
|
||||
cleanup:
|
||||
if (out_dadec_f) fclose(out_dadec_f);
|
||||
if (out_ref_f) fclose(out_ref_f);
|
||||
free(out_uv_ref); free(out_y_ref);
|
||||
free(out_uv_dadec);free(out_y_dadec);
|
||||
if (dec) daedalus_decoder_destroy(dec);
|
||||
av_frame_free(&fr);
|
||||
av_packet_free(&pkt);
|
||||
avcodec_free_context(&avctx);
|
||||
avformat_close_input(&fmt);
|
||||
return rc;
|
||||
}
|
||||
Reference in New Issue
Block a user