Add tests/api/api-enc-parser-test.c, a generic encoder+parser round-trip
test that takes codec_name, width, and height on the command line
(defaults: h261 176 144).
Three cases are tested:
garbage - a single av_parser_parse2() call on 8 bytes with no Picture
Start Code; verifies out_size == 0 so the parser emits no spurious data.
bulk - encodes 2 frames, concatenates the raw packets, feeds the whole
buffer to a fresh parser in one call, then flushes. Verifies that
exactly 2 non-empty frames come out and that the parser found the PSC
boundary between them.
split - the same buffer fed in two halves (chunk boundary falls inside
frame 0). Verifies the parser still emits exactly 2 frames when input
arrives incrementally, and that the collected bytes are identical to
the bulk output (checked with memcmp).
Implementation notes: avcodec_get_supported_config() selects the pixel
format; chroma height uses AV_CEIL_RSHIFT with log2_chroma_h from
AVPixFmtDescriptor; data[1] and data[2] are checked independently so
semi-planar formats work; the encoded buffer is given
AV_INPUT_BUFFER_PADDING_SIZE zero bytes at the end; parse_stream()
skips the fed chunk if consumed==0 to prevent an infinite loop.
Two FATE entries in tests/fate/api.mak: QCIF (176x144) and CIF
(352x288), both standard H.261 resolutions.
Signed-off-by: Soham Kute <officialsohamkute@gmail.com>
