From d3f756ad629b39888e4ed860762ca2f06b1b0c81 Mon Sep 17 00:00:00 2001 From: Nicolas Dufresne Date: Fri, 13 May 2022 22:29:07 +0200 Subject: media: v4l2: Trace calculated p/b0/b1 initial reflist Add debug print statements to print the content of P & B reference lists, to verify that the ordering of the generated reference lists is correct. This is especially important for the field decoding mode, where sorting is more complex. Signed-off-by: Nicolas Dufresne Tested-by: Sebastian Fricke Reviewed-by: Sebastian Fricke Signed-off-by: Hans Verkuil Signed-off-by: Mauro Carvalho Chehab --- drivers/media/v4l2-core/v4l2-h264.c | 100 ++++++++++++++++++++++++++++++++++++ 1 file changed, 100 insertions(+) (limited to 'drivers/media') diff --git a/drivers/media/v4l2-core/v4l2-h264.c b/drivers/media/v4l2-core/v4l2-h264.c index 38d8dbda0045..853f54e0fe67 100644 --- a/drivers/media/v4l2-core/v4l2-h264.c +++ b/drivers/media/v4l2-core/v4l2-h264.c @@ -12,6 +12,12 @@ #include +/* + * Size of the tempory buffer allocated when printing reference lists. The + * output will be truncated if the size is too small. + */ +static const int tmp_str_size = 1024; + /** * v4l2_h264_init_reflist_builder() - Initialize a P/B0/B1 reference list * builder @@ -241,6 +247,95 @@ static int v4l2_h264_b1_ref_list_cmp(const void *ptra, const void *ptrb, return poca < pocb ? -1 : 1; } +static char ref_type_to_char(u8 ref_type) +{ + switch (ref_type) { + case V4L2_H264_FRAME_REF: + return 'f'; + case V4L2_H264_TOP_FIELD_REF: + return 't'; + case V4L2_H264_BOTTOM_FIELD_REF: + return 'b'; + } + + return '?'; +} + +static const char *format_ref_list_p(const struct v4l2_h264_reflist_builder *builder, + struct v4l2_h264_reference *reflist, + char **out_str) +{ + int n = 0, i; + + *out_str = kmalloc(tmp_str_size, GFP_KERNEL); + + n += snprintf(*out_str + n, tmp_str_size - n, "|"); + + for (i = 0; i < builder->num_valid; i++) { + /* this is pic_num for frame and frame_num (wrapped) for field, + * but for frame pic_num is equal to frame_num (wrapped). + */ + int frame_num = builder->refs[reflist[i].index].frame_num; + bool longterm = builder->refs[reflist[i].index].longterm; + + n += scnprintf(*out_str + n, tmp_str_size - n, "%i%c%c|", + frame_num, longterm ? 'l' : 's', + ref_type_to_char(reflist[i].fields)); + } + + return *out_str; +} + +static void print_ref_list_p(const struct v4l2_h264_reflist_builder *builder, + struct v4l2_h264_reference *reflist) +{ + char *buf = NULL; + + pr_debug("ref_pic_list_p (cur_poc %u%c) %s\n", + builder->cur_pic_order_count, + ref_type_to_char(builder->cur_pic_fields), + format_ref_list_p(builder, reflist, &buf)); + + kfree(buf); +} + +static const char *format_ref_list_b(const struct v4l2_h264_reflist_builder *builder, + struct v4l2_h264_reference *reflist, + char **out_str) +{ + int n = 0, i; + + *out_str = kmalloc(tmp_str_size, GFP_KERNEL); + + n += snprintf(*out_str + n, tmp_str_size - n, "|"); + + for (i = 0; i < builder->num_valid; i++) { + int frame_num = builder->refs[reflist[i].index].frame_num; + u32 poc = v4l2_h264_get_poc(builder, reflist + i); + bool longterm = builder->refs[reflist[i].index].longterm; + + n += scnprintf(*out_str + n, tmp_str_size - n, "%i%c%c|", + longterm ? frame_num : poc, + longterm ? 'l' : 's', + ref_type_to_char(reflist[i].fields)); + } + + return *out_str; +} + +static void print_ref_list_b(const struct v4l2_h264_reflist_builder *builder, + struct v4l2_h264_reference *reflist, u8 list_num) +{ + char *buf = NULL; + + pr_debug("ref_pic_list_b%u (cur_poc %u%c) %s", + list_num, builder->cur_pic_order_count, + ref_type_to_char(builder->cur_pic_fields), + format_ref_list_b(builder, reflist, &buf)); + + kfree(buf); +} + /** * v4l2_h264_build_p_ref_list() - Build the P reference list * @@ -261,6 +356,8 @@ v4l2_h264_build_p_ref_list(const struct v4l2_h264_reflist_builder *builder, sizeof(builder->unordered_reflist[0]) * builder->num_valid); sort_r(reflist, builder->num_valid, sizeof(*reflist), v4l2_h264_p_ref_list_cmp, NULL, builder); + + print_ref_list_p(builder, reflist); } EXPORT_SYMBOL_GPL(v4l2_h264_build_p_ref_list); @@ -296,6 +393,9 @@ v4l2_h264_build_b_ref_lists(const struct v4l2_h264_reflist_builder *builder, if (builder->num_valid > 1 && !memcmp(b1_reflist, b0_reflist, builder->num_valid)) swap(b1_reflist[0], b1_reflist[1]); + + print_ref_list_b(builder, b0_reflist, 0); + print_ref_list_b(builder, b1_reflist, 1); } EXPORT_SYMBOL_GPL(v4l2_h264_build_b_ref_lists); -- cgit v1.2.3-59-g8ed1b