lavc/options: add test for avcodec_copy_context

This test doesn't cover every possible issue with this function.
It covers options management only.
Signed-off-by: Lukasz Marek <lukasz.m.luki2@gmail.com>

libavcodec/Makefile

@@ -858,6 +858,8 @@ SKIPHEADERS-$(CONFIG_VDA)              += vda.h vda_internal.h
 SKIPHEADERS-$(CONFIG_VDPAU)            += vdpau.h vdpau_internal.h
 
 TESTPROGS = imgconvert                                                  \
+            options                                                     \
+
 
 TESTPROGS-$(CONFIG_CABAC)                 += cabac
 TESTPROGS-$(CONFIG_FFT)                   += fft fft-fixed fft-fixed32

libavcodec/options.c

@@ -309,3 +309,174 @@ const AVClass *avcodec_get_subtitle_rect_class(void)
 {
     return &av_subtitle_rect_class;
 }
+
+#ifdef TEST
+static int dummy_init(AVCodecContext *ctx)
+{
+    //TODO: this code should set every possible pointer that could be set by codec and is not an option;
+    ctx->extradata_size = 8;
+    ctx->extradata = av_malloc(ctx->extradata_size);
+    ctx->coded_frame = av_frame_alloc();
+    return 0;
+}
+
+static int dummy_close(AVCodecContext *ctx)
+{
+    av_freep(&ctx->extradata);
+    ctx->extradata_size = 0;
+    av_frame_free(&ctx->coded_frame);
+    return 0;
+}
+
+static int dummy_encode(AVCodecContext *ctx, AVPacket *pkt, const AVFrame *frame, int *got_packet)
+{
+    return AVERROR(ENOSYS);
+}
+
+typedef struct Dummy12Context {
+    AVClass  *av_class;
+    int      num;
+    char*    str;
+} Dummy12Context;
+
+typedef struct Dummy3Context {
+    void     *fake_av_class;
+    int      num;
+    char*    str;
+} Dummy3Context;
+
+#define OFFSET(x) offsetof(Dummy12Context, x)
+#define VE AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_ENCODING_PARAM
+static const AVOption dummy_options[] = {
+    { "str", "set str", OFFSET(str), AV_OPT_TYPE_STRING, { .str = "i'm src default value" }, 0, 0, VE},
+    { "num", "set num", OFFSET(num), AV_OPT_TYPE_INT,    { .i64 = 1500100900 },    0, INT_MAX, VE},
+    { NULL },
+};
+
+static const AVClass dummy_v1_class = {
+    .class_name = "dummy_v1_class",
+    .item_name  = av_default_item_name,
+    .option     = dummy_options,
+    .version    = LIBAVUTIL_VERSION_INT,
+};
+
+static const AVClass dummy_v2_class = {
+    .class_name = "dummy_v2_class",
+    .item_name  = av_default_item_name,
+    .option     = dummy_options,
+    .version    = LIBAVUTIL_VERSION_INT,
+};
+
+/* codec with options */
+AVCodec dummy_v1_encoder = {
+    .name             = "dummy_v1_codec",
+    .type             = AVMEDIA_TYPE_VIDEO,
+    .id               = AV_CODEC_ID_NONE - 1,
+    .encode2          = dummy_encode,
+    .init             = dummy_init,
+    .close            = dummy_close,
+    .priv_class       = &dummy_v1_class,
+    .priv_data_size   = sizeof(Dummy12Context),
+};
+
+/* codec with options, different class */
+AVCodec dummy_v2_encoder = {
+    .name             = "dummy_v2_codec",
+    .type             = AVMEDIA_TYPE_VIDEO,
+    .id               = AV_CODEC_ID_NONE - 2,
+    .encode2          = dummy_encode,
+    .init             = dummy_init,
+    .close            = dummy_close,
+    .priv_class       = &dummy_v2_class,
+    .priv_data_size   = sizeof(Dummy12Context),
+};
+
+/* codec with priv data, but no class */
+AVCodec dummy_v3_encoder = {
+    .name             = "dummy_v3_codec",
+    .type             = AVMEDIA_TYPE_VIDEO,
+    .id               = AV_CODEC_ID_NONE - 3,
+    .encode2          = dummy_encode,
+    .init             = dummy_init,
+    .close            = dummy_close,
+    .priv_data_size   = sizeof(Dummy3Context),
+};
+
+/* codec without priv data */
+AVCodec dummy_v4_encoder = {
+    .name             = "dummy_v4_codec",
+    .type             = AVMEDIA_TYPE_VIDEO,
+    .id               = AV_CODEC_ID_NONE - 4,
+    .encode2          = dummy_encode,
+    .init             = dummy_init,
+    .close            = dummy_close,
+};
+
+static void test_copy_print_codec(const AVCodecContext *ctx)
+{
+    printf("%-14s: %dx%d prv: %s",
+           ctx->codec ? ctx->codec->name : "NULL",
+           ctx->width, ctx->height,
+           ctx->priv_data ? "set" : "null");
+    if (ctx->codec && ctx->codec->priv_class && ctx->codec->priv_data_size) {
+        int64_t i64;
+        char *str = NULL;
+        av_opt_get_int(ctx->priv_data, "num", 0, &i64);
+        av_opt_get(ctx->priv_data, "str", 0, (uint8_t**)&str);
+        printf(" opts: %"PRId64" %s", i64, str);
+        av_free(str);
+    }
+    printf("\n");
+}
+
+static void test_copy(const AVCodec *c1, const AVCodec *c2)
+{
+    AVCodecContext *ctx1, *ctx2;
+    printf("%s -> %s\nclosed:\n", c1 ? c1->name : "NULL", c2 ? c2->name : "NULL");
+    ctx1 = avcodec_alloc_context3(c1);
+    ctx2 = avcodec_alloc_context3(c2);
+    ctx1->width = ctx1->height = 128;
+    if (ctx2->codec && ctx2->codec->priv_class && ctx2->codec->priv_data_size) {
+        av_opt_set(ctx2->priv_data, "num", "667", 0);
+        av_opt_set(ctx2->priv_data, "str", "i'm dest value before copy", 0);
+    }
+    avcodec_copy_context(ctx2, ctx1);
+    test_copy_print_codec(ctx1);
+    test_copy_print_codec(ctx2);
+    if (ctx1->codec) {
+        printf("opened:\n");
+        avcodec_open2(ctx1, ctx1->codec, NULL);
+        if (ctx2->codec && ctx2->codec->priv_class && ctx2->codec->priv_data_size) {
+            av_opt_set(ctx2->priv_data, "num", "667", 0);
+            av_opt_set(ctx2->priv_data, "str", "i'm dest value before copy", 0);
+        }
+        avcodec_copy_context(ctx2, ctx1);
+        test_copy_print_codec(ctx1);
+        test_copy_print_codec(ctx2);
+        avcodec_close(ctx1);
+    }
+    avcodec_free_context(&ctx1);
+    avcodec_free_context(&ctx2);
+}
+
+int main(void)
+{
+    AVCodec *dummy_codec[] = {
+        &dummy_v1_encoder,
+        &dummy_v2_encoder,
+        &dummy_v3_encoder,
+        &dummy_v4_encoder,
+        NULL,
+    };
+    int i, j;
+
+    for (i = 0; dummy_codec[i]; i++)
+        avcodec_register(dummy_codec[i]);
+
+    printf("testing avcodec_copy_context()\n");
+    for (i = 0; i < FF_ARRAY_ELEMS(dummy_codec); i++)
+        for (j = 0; j < FF_ARRAY_ELEMS(dummy_codec); j++)
+            test_copy(dummy_codec[i], dummy_codec[j]);
+    return 0;
+}
+#endif