61 const int qscale = a->
qscale;
67 component = (n <= 3 ? 0 : n - 4 + 1);
72 block[0] = a->
last_dc[component] << 3;
85 }
else if (level != 0) {
88 level = (level * qscale * quant_matrix[j]) >> 3;
100 level = (level * qscale * quant_matrix[j]) >> 3;
101 level = (level - 1) | 1;
104 level = (level * qscale * quant_matrix[j]) >> 3;
105 level = (level - 1) | 1;
124 const int block_index[6] = { 5, 4, 0, 1, 2, 3 };
128 for (i = 0; i < 6; i++) {
130 block_index[i])) < 0)
143 uint8_t *dest_y = frame->
data[0] + (mb_y * 16* linesize ) + mb_x * 16;
159 void *
data,
int *got_frame,
164 int buf_size = avpkt->
size;
178 for (i = 0; i < buf_size; i += 2) {
static int decode_mb(MDECContext *a, int16_t block[6][64])
av_cold void ff_dsputil_init(DSPContext *c, AVCodecContext *avctx)
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
This structure describes decoded (raw) audio or video data.
int coded_width
Bitstream width / height, may be different from width/height e.g.
static unsigned int get_bits(GetBitContext *s, int n)
Read 1-25 bits.
av_cold void ff_mpeg12_init_vlcs(void)
#define DECLARE_ALIGNED(n, t, v)
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
static int get_sbits(GetBitContext *s, int n)
void av_freep(void *arg)
Free a memory block which has been allocated with av_malloc(z)() or av_realloc() and set the pointer ...
static int decode(MimicContext *ctx, int quality, int num_coeffs, int is_iframe)
void(* idct_put)(uint8_t *dest, int line_size, int16_t *block)
block -> idct -> clip to unsigned 8 bit -> dest.
Multithreading support functions.
static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
#define CODEC_CAP_DR1
Codec uses get_buffer() for allocating buffers and supports custom allocators.
static int get_bits_count(const GetBitContext *s)
uint8_t idct_permutation[64]
idct input permutation.
const uint16_t ff_mpeg1_default_intra_matrix[64]
static int get_bits_left(GetBitContext *gb)
#define UPDATE_CACHE(name, gb)
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
void av_log(void *avcl, int level, const char *fmt,...)
const char * name
Name of the codec implementation.
#define CLOSE_READER(name, gb)
static int decode_dc(GetBitContext *gb, int component)
#define GET_RL_VLC(level, run, name, gb, table, bits,max_depth, need_update)
#define SKIP_BITS(name, gb, num)
#define ONLY_IF_THREADS_ENABLED(x)
Define a function with only the non-default version specified.
#define FF_INPUT_BUFFER_PADDING_SIZE
Required number of additionally allocated bytes at the end of the input bitstream for decoding...
enum AVPictureType pict_type
Picture type of the frame.
planar YUV 4:2:0, 12bpp, full scale (JPEG), deprecated in favor of PIX_FMT_YUV420P and setting color_...
void(* clear_blocks)(int16_t *blocks)
int idct_algo
IDCT algorithm, see FF_IDCT_* below.
unsigned int bitstream_buffer_size
#define LAST_SKIP_BITS(name, gb, num)
uint8_t * bitstream_buffer
RL_VLC_ELEM * rl_vlc[32]
decoding only
#define SHOW_UBITS(name, gb, num)
Libavcodec external API header.
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
int ff_thread_get_buffer(AVCodecContext *avctx, ThreadFrame *f, int flags)
Wrapper around get_buffer() for frame-multithreaded codecs.
main external API structure.
static void close(AVCodecParserContext *s)
#define OPEN_READER(name, gb)
static av_cold int decode_end(AVCodecContext *avctx)
av_cold void ff_init_scantable(uint8_t *permutation, ScanTable *st, const uint8_t *src_scantable)
static av_cold int decode_init_thread_copy(AVCodecContext *avctx)
static void skip_bits(GetBitContext *s, int n)
static int mdec_decode_block_intra(MDECContext *a, int16_t *block, int n)
static int init_get_bits(GetBitContext *s, const uint8_t *buffer, int bit_size)
Initialize GetBitContext.
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
#define SHOW_SBITS(name, gb, num)
void av_fast_malloc(void *ptr, unsigned int *size, size_t min_size)
Allocate a buffer, reusing the given one if large enough.
const uint8_t ff_zigzag_direct[64]
#define CODEC_CAP_FRAME_THREADS
Codec supports frame-level multithreading.
#define CODEC_FLAG_GRAY
Only decode/encode grayscale.
static av_cold int init(AVCodecParserContext *s)
int key_frame
1 -> keyframe, 0-> not
static void idct_put(MDECContext *a, AVFrame *frame, int mb_x, int mb_y)
static av_cold int decode_init(AVCodecContext *avctx)
This structure stores compressed data.