[FFmpeg-devel] [PATCH v4 2/6] tests: Add stream dump test API util.

[Romain Beauxis <romain.beauxis@gmail.com>]

This is the code for the main utility used to dump chained streams and
test for decoded metadata in subsequent patches.

---
 tests/Makefile                        |   1 +
 tests/api/Makefile                    |   2 +-
 tests/api/api-dump-stream-meta-test.c | 169 ++++++++++++++++++++++++++
 3 files changed, 171 insertions(+), 1 deletion(-)
 create mode 100644 tests/api/api-dump-stream-meta-test.c

diff --git a/tests/Makefile b/tests/Makefile
index f9f5fc07f3..1f7e5003c2 100644
--- a/tests/Makefile
+++ b/tests/Makefile
@@ -277,6 +277,7 @@ $(FATE_FFPROBE) $(FATE_FFMPEG_FFPROBE) $(FATE_SAMPLES_FFPROBE) $(FATE_SAMPLES_FF
 $(FATE_SAMPLES_FASTSTART): tools/qt-faststart$(EXESUF)
 $(FATE_SAMPLES_DUMP_DATA) $(FATE_SAMPLES_DUMP_DATA-yes): tools/venc_data_dump$(EXESUF)
 $(FATE_SAMPLES_SCALE_SLICE): tools/scale_slice_test$(EXESUF)
+$(FATE_SAMPLES_DUMP_STREAM_META): tests/api/api-dump-stream-meta-test$(EXESUF)
 
 ifdef SAMPLES
 FATE += $(FATE_EXTERN)
diff --git a/tests/api/Makefile b/tests/api/Makefile
index c96e636756..a2cb06a729 100644
--- a/tests/api/Makefile
+++ b/tests/api/Makefile
@@ -1,7 +1,7 @@
 APITESTPROGS-$(call ENCDEC, FLAC, FLAC) += api-flac
 APITESTPROGS-$(call DEMDEC, H264, H264) += api-h264
 APITESTPROGS-$(call DEMDEC, H264, H264) += api-h264-slice
-APITESTPROGS-yes += api-seek
+APITESTPROGS-yes += api-seek api-dump-stream-meta
 APITESTPROGS-$(call DEMDEC, H263, H263) += api-band
 APITESTPROGS-$(HAVE_THREADS) += api-threadmessage
 APITESTPROGS += $(APITESTPROGS-yes)
diff --git a/tests/api/api-dump-stream-meta-test.c b/tests/api/api-dump-stream-meta-test.c
new file mode 100644
index 0000000000..4ffdfe8213
--- /dev/null
+++ b/tests/api/api-dump-stream-meta-test.c
@@ -0,0 +1,169 @@
+/*
+ * Copyright (c) 2025 Romain Beauxis
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+/**
+ * Dump stream metadata
+ */
+
+#include "libavcodec/avcodec.h"
+#include "libavformat/avformat.h"
+#include "libavutil/timestamp.h"
+
+static int dump_stream_meta(const char *input_filename)
+{
+    const AVCodec *codec = NULL;
+    AVPacket *pkt = NULL;
+    AVFrame *fr = NULL;
+    AVFormatContext *fmt_ctx = NULL;
+    AVCodecContext *ctx = NULL;
+    AVCodecParameters *origin_par = NULL;
+    int audio_stream;
+    int result;
+    char *metadata;
+
+    result = avformat_open_input(&fmt_ctx, input_filename, NULL, NULL);
+    if (result < 0) {
+        av_log(NULL, AV_LOG_ERROR, "Can't open file\n");
+        return result;
+    }
+
+    result = avformat_find_stream_info(fmt_ctx, NULL);
+    if (result < 0) {
+        av_log(NULL, AV_LOG_ERROR, "Can't get stream info\n");
+        goto end;
+    }
+
+    // TODO: add ability to work with video format
+    audio_stream =
+        av_find_best_stream(fmt_ctx, AVMEDIA_TYPE_AUDIO, -1, -1, NULL, 0);
+    if (audio_stream < 0) {
+        av_log(NULL, AV_LOG_ERROR, "Can't find audio stream in input file\n");
+        result = audio_stream;
+        goto end;
+    }
+
+    origin_par = fmt_ctx->streams[audio_stream]->codecpar;
+
+    result = av_dict_get_string(
+        fmt_ctx->streams[audio_stream]->metadata, &metadata, '=', ':');
+    if (result < 0)
+        goto end;
+
+    printf("Stream ID: %d, codec name: %s, metadata: %s\n", audio_stream,
+        avcodec_get_name(origin_par->codec_id), metadata);
+
+    codec = avcodec_find_decoder(origin_par->codec_id);
+    if (!codec) {
+        av_log(NULL, AV_LOG_ERROR, "Can't find decoder\n");
+        result = AVERROR_DECODER_NOT_FOUND;
+        goto end;
+    }
+
+    ctx = avcodec_alloc_context3(codec);
+    if (!ctx) {
+        av_log(NULL, AV_LOG_ERROR, "Can't allocate decoder context\n");
+        result = AVERROR(ENOMEM);
+        goto end;
+    }
+
+    result = avcodec_parameters_to_context(ctx, origin_par);
+    if (result) {
+        av_log(NULL, AV_LOG_ERROR, "Can't copy decoder context\n");
+        goto end;
+    }
+
+    result = avcodec_open2(ctx, codec, NULL);
+    if (result < 0) {
+        av_log(ctx, AV_LOG_ERROR, "Can't open decoder\n");
+        goto end;
+    }
+
+    pkt = av_packet_alloc();
+    if (!pkt) {
+        av_log(NULL, AV_LOG_ERROR, "Cannot allocate packet\n");
+        result = AVERROR(ENOMEM);
+        goto end;
+    }
+
+    fr = av_frame_alloc();
+    if (!fr) {
+        av_log(NULL, AV_LOG_ERROR, "Can't allocate frame\n");
+        result = AVERROR(ENOMEM);
+        goto end;
+    }
+
+    for (;;) {
+        result = av_read_frame(fmt_ctx, pkt);
+        if (result)
+            goto end;
+
+        if (pkt->stream_index != audio_stream) {
+            av_packet_unref(pkt);
+            continue;
+        }
+
+        printf("Stream ID: %d, packet PTS: %s, packet DTS: %s\n",
+            pkt->stream_index, av_ts2str(pkt->pts), av_ts2str(pkt->dts));
+
+        result = avcodec_send_packet(ctx, pkt);
+        av_packet_unref(pkt);
+
+        if (result < 0)
+            goto end;
+
+        result = avcodec_receive_frame(ctx, fr);
+        if (result == AVERROR_EOF) {
+            result = 0;
+            goto end;
+        }
+
+        if (result == AVERROR(EAGAIN))
+            continue;
+
+        result = av_dict_get_string(fr->metadata, &metadata, '=', ':');
+        if (result < 0)
+            goto end;
+
+        printf("Stream ID: %d, frame PTS: %s, metadata: %s\n",
+            pkt->stream_index, av_ts2str(fr->pts), metadata);
+    }
+
+end:
+    av_packet_free(&pkt);
+    av_frame_free(&fr);
+    avformat_close_input(&fmt_ctx);
+    avcodec_free_context(&ctx);
+    return result;
+}
+
+int main(int argc, char **argv)
+{
+    if (argc < 2) {
+        av_log(NULL, AV_LOG_ERROR, "Incorrect input\n");
+        return 1;
+    }
+
+    if (dump_stream_meta(argv[1]) != AVERROR_EOF)
+        return 1;
+
+    return 0;
+}
-- 
2.39.5 (Apple Git-154)

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