mirror of https://git.ffmpeg.org/ffmpeg.git
reworked decode_frame marker searching, fixes many non-working samples
Originally committed as revision 1079 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Alex Beregszaszi
parent
060f89b328
commit
109362cbf4
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@ -17,10 +17,10 @@
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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* Support for external huffman table, various fixes (AVID workaround),
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* aspecting and various markers support
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* aspecting and new decode_frame mechanism
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* by Alex Beregszaszi <alex@naxine.org>
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*/
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//#define DEBUG
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#define DEBUG
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#include "avcodec.h"
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#include "dsputil.h"
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#include "mpegvideo.h"
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@ -29,7 +29,7 @@
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#include "fastmemcpy.h"
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#endif
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/* use two quantizer table (one for luminance and one for chrominance) */
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/* use two quantizer tables (one for luminance and one for chrominance) */
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/* not yet working */
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#undef TWOMATRIXES
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@ -590,11 +590,12 @@ void mjpeg_encode_mb(MpegEncContext *s,
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typedef struct MJpegDecodeContext {
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AVCodecContext *avctx;
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GetBitContext gb;
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UINT32 header_state;
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int start_code; /* current start code */
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UINT8 *buf_ptr;
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int buffer_size;
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int mpeg_enc_ctx_allocated; /* true if decoding context allocated */
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int start_code; /* current start code */
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int buffer_size;
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UINT8 *buffer;
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INT16 quant_matrixes[4][64];
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VLC vlcs[2][4];
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@ -614,7 +615,6 @@ typedef struct MJpegDecodeContext {
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UINT8 *current_picture[MAX_COMPONENTS]; /* picture structure */
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int linesize[MAX_COMPONENTS];
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DCTELEM block[64] __align8;
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UINT8 buffer[PICTURE_BUFFER_SIZE];
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int buggy_avid;
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int restart_interval;
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@ -624,13 +624,7 @@ typedef struct MJpegDecodeContext {
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void (*idct_put)(UINT8 *dest/*align 8*/, int line_size, DCTELEM *block/*align 16*/);
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} MJpegDecodeContext;
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#define SKIP_REMAINING(gb, len) { \
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dprintf("reamining %d bytes in marker\n", len); \
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if (len) while (--len) \
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skip_bits(gb, 8); \
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}
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static int mjpeg_decode_dht(MJpegDecodeContext *s, UINT8 *buf, int buf_size);
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static int mjpeg_decode_dht(MJpegDecodeContext *s);
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static void build_vlc(VLC *vlc, const UINT8 *bits_table, const UINT8 *val_table,
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int nb_codes)
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@ -664,12 +658,11 @@ static int mjpeg_decode_init(AVCodecContext *avctx)
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s->idct_put= s2.idct_put;
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MPV_common_end(&s2);
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s->header_state = 0;
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s->mpeg_enc_ctx_allocated = 0;
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s->buffer_size = PICTURE_BUFFER_SIZE - 1; /* minus 1 to take into
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account FF 00 case */
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s->buffer = av_malloc(s->buffer_size);
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s->start_code = -1;
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s->buf_ptr = s->buffer;
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s->first_picture = 1;
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s->org_width = avctx->width;
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s->org_height = avctx->height;
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@ -682,18 +675,18 @@ static int mjpeg_decode_init(AVCodecContext *avctx)
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if (avctx->flags & CODEC_FLAG_EXTERN_HUFF)
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{
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printf("mjpeg: using external huffman table\n");
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mjpeg_decode_dht(s, avctx->extradata, avctx->extradata_size);
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init_get_bits(&s->gb, avctx->extradata, avctx->extradata_size);
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mjpeg_decode_dht(s);
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/* should check for error - but dunno */
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}
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return 0;
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}
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/* quantize tables */
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static int mjpeg_decode_dqt(MJpegDecodeContext *s,
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UINT8 *buf, int buf_size)
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static int mjpeg_decode_dqt(MJpegDecodeContext *s)
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{
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int len, index, i, j;
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init_get_bits(&s->gb, buf, buf_size);
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len = get_bits(&s->gb, 16) - 2;
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@ -716,23 +709,17 @@ static int mjpeg_decode_dqt(MJpegDecodeContext *s,
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len -= 65;
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}
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SKIP_REMAINING(&s->gb, len);
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return 0;
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}
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/* decode huffman tables and build VLC decoders */
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static int mjpeg_decode_dht(MJpegDecodeContext *s,
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UINT8 *buf, int buf_size)
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static int mjpeg_decode_dht(MJpegDecodeContext *s)
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{
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int len, index, i, class, n, v, code_max;
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UINT8 bits_table[17];
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UINT8 val_table[256];
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init_get_bits(&s->gb, buf, buf_size);
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len = get_bits(&s->gb, 16);
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len -= 2;
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len = get_bits(&s->gb, 16) - 2;
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while (len > 0) {
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if (len < 17)
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@ -770,13 +757,10 @@ static int mjpeg_decode_dht(MJpegDecodeContext *s,
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return 0;
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}
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static int mjpeg_decode_sof0(MJpegDecodeContext *s,
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UINT8 *buf, int buf_size)
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static int mjpeg_decode_sof0(MJpegDecodeContext *s)
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{
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int len, nb_components, i, width, height;
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init_get_bits(&s->gb, buf, buf_size);
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/* XXX: verify len field validity */
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len = get_bits(&s->gb, 16);
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/* only 8 bits/component accepted */
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@ -851,8 +835,12 @@ static int mjpeg_decode_sof0(MJpegDecodeContext *s,
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static inline int mjpeg_decode_dc(MJpegDecodeContext *s, int dc_index)
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{
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int code, diff;
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#if 0
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code = get_vlc2(&s->gb, s->vlc[0][dc_index].table,
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s->vlc[0][dc_index].bits, 1);
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#else
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code = get_vlc(&s->gb, &s->vlcs[0][dc_index]);
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#endif
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if (code < 0)
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{
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dprintf("mjpeg_decode_dc: bad vlc: %d:%d (%p)\n", 0, dc_index,
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@ -892,7 +880,12 @@ static int decode_block(MJpegDecodeContext *s, DCTELEM *block,
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ac_vlc = &s->vlcs[1][ac_index];
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i = 1;
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for(;;) {
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#if 0
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code = get_vlc2(&s->gb, s->vlcs[1][ac_index].table,
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s->vlcs[1][ac_index].bits, 2);
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#else
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code = get_vlc(&s->gb, ac_vlc);
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#endif
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if (code < 0) {
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dprintf("error ac\n");
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return -1;
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@ -923,8 +916,7 @@ static int decode_block(MJpegDecodeContext *s, DCTELEM *block,
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return 0;
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}
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static int mjpeg_decode_sos(MJpegDecodeContext *s,
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UINT8 *buf, int buf_size)
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static int mjpeg_decode_sos(MJpegDecodeContext *s)
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{
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int len, nb_components, i, j, n, h, v, ret;
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int mb_width, mb_height, mb_x, mb_y, vmax, hmax, index, id;
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@ -935,10 +927,14 @@ static int mjpeg_decode_sos(MJpegDecodeContext *s,
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int h_count[4];
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int v_count[4];
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init_get_bits(&s->gb, buf, buf_size);
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/* XXX: verify len field validity */
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len = get_bits(&s->gb, 16);
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nb_components = get_bits(&s->gb, 8);
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if (len != 6+2*nb_components)
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{
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dprintf("decode_sos: invalid len (%d)\n", len);
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return -1;
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}
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/* XXX: only interleaved scan accepted */
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if (nb_components != 3)
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{
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@ -1061,11 +1057,8 @@ static int mjpeg_decode_sos(MJpegDecodeContext *s,
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return -1;
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}
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static int mjpeg_decode_dri(MJpegDecodeContext *s,
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UINT8 *buf, int buf_size)
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static int mjpeg_decode_dri(MJpegDecodeContext *s)
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{
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init_get_bits(&s->gb, buf, buf_size);
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if (get_bits(&s->gb, 16) != 4)
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return -1;
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s->restart_interval = get_bits(&s->gb, 16);
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@ -1075,13 +1068,10 @@ static int mjpeg_decode_dri(MJpegDecodeContext *s,
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}
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#define FOURCC(a,b,c,d) ((a << 24) | (b << 16) | (c << 8) | d)
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static int mjpeg_decode_app(MJpegDecodeContext *s,
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UINT8 *buf, int buf_size, int start_code)
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static int mjpeg_decode_app(MJpegDecodeContext *s, int start_code)
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{
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int len, id;
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init_get_bits(&s->gb, buf, buf_size);
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/* XXX: verify len field validity */
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len = get_bits(&s->gb, 16);
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if (len < 5)
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@ -1164,20 +1154,16 @@ static int mjpeg_decode_app(MJpegDecodeContext *s,
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out:
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/* should check for further values.. */
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SKIP_REMAINING(&s->gb, len);
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return 0;
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}
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#undef FOURCC
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static int mjpeg_decode_com(MJpegDecodeContext *s,
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UINT8 *buf, int buf_size)
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static int mjpeg_decode_com(MJpegDecodeContext *s)
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{
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int len, i;
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UINT8 *cbuf;
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init_get_bits(&s->gb, buf, buf_size);
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/* XXX: verify len field validity */
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len = get_bits(&s->gb, 16)-2;
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cbuf = av_malloc(len+1);
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@ -1195,8 +1181,8 @@ static int mjpeg_decode_com(MJpegDecodeContext *s,
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if (!strcmp(cbuf, "AVID"))
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{
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s->buggy_avid = 1;
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if (s->first_picture)
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printf("mjpeg: workarounding buggy AVID\n");
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// if (s->first_picture)
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// printf("mjpeg: workarounding buggy AVID\n");
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}
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av_free(cbuf);
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@ -1204,41 +1190,58 @@ static int mjpeg_decode_com(MJpegDecodeContext *s,
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return 0;
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}
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#if 0
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static int valid_marker_list[] =
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{
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/* 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, a, b, c, d, e, f */
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/* 0 */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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/* 1 */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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/* 2 */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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/* 3 */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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/* 4 */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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/* 5 */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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/* 6 */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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/* 7 */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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/* 8 */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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/* 9 */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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/* a */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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/* b */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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/* c */ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
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/* d */ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
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/* e */ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
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/* f */ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0,
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}
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#endif
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/* return the 8 bit start code value and update the search
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state. Return -1 if no start code found */
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static int find_marker(UINT8 **pbuf_ptr, UINT8 *buf_end,
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UINT32 *header_state)
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static int find_marker(UINT8 **pbuf_ptr, UINT8 *buf_end)
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{
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UINT8 *buf_ptr;
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unsigned int state, v;
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unsigned int v, v2;
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int val;
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#ifdef DEBUG
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int skipped=0;
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#endif
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state = *header_state;
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buf_ptr = *pbuf_ptr;
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retry:
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if (state) {
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/* get marker */
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found:
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if (buf_ptr < buf_end) {
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val = *buf_ptr++;
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state = 0;
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if ((val >= RST0) && (val <= RST7))
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goto retry;
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} else {
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val = -1;
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}
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} else {
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while (buf_ptr < buf_end) {
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v = *buf_ptr++;
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if (v == 0xff) {
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state = 1;
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v2 = *buf_ptr;
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if ((v == 0xff) && (v2 >= 0xc0) && (v2 <= 0xfe)) {
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val = *buf_ptr++;
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goto found;
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}
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#ifdef DEBUG
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skipped++;
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#endif
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}
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val = -1;
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}
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found:
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#ifdef DEBUG
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dprintf("find_marker skipped %d bytes\n", skipped);
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#endif
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*pbuf_ptr = buf_ptr;
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*header_state = state;
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return val;
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}
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@ -1247,10 +1250,9 @@ static int mjpeg_decode_frame(AVCodecContext *avctx,
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UINT8 *buf, int buf_size)
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{
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MJpegDecodeContext *s = avctx->priv_data;
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UINT8 *buf_end, *buf_ptr, *buf_start;
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int len, code, input_size, i;
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UINT8 *buf_end, *buf_ptr;
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int i, start_code;
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AVPicture *picture = data;
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unsigned int start_code;
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*data_size = 0;
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|
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@ -1261,49 +1263,78 @@ static int mjpeg_decode_frame(AVCodecContext *avctx,
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buf_ptr = buf;
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buf_end = buf + buf_size;
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while (buf_ptr < buf_end) {
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buf_start = buf_ptr;
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/* find start next marker */
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code = find_marker(&buf_ptr, buf_end, &s->header_state);
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/* copy to buffer */
|
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len = buf_ptr - buf_start;
|
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if (len + (s->buf_ptr - s->buffer) > s->buffer_size) {
|
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/* data too big : flush */
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s->buf_ptr = s->buffer;
|
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if (code > 0)
|
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s->start_code = code;
|
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start_code = find_marker(&buf_ptr, buf_end);
|
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{
|
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/* EOF */
|
||||
if (start_code < 0) {
|
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goto the_end;
|
||||
} else {
|
||||
memcpy(s->buf_ptr, buf_start, len);
|
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s->buf_ptr += len;
|
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if (code < 0) {
|
||||
/* nothing to do: wait next marker */
|
||||
} else if (code == 0 || code == 0xff) {
|
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/* if we got FF 00, we copy FF to the stream to unescape FF 00 */
|
||||
/* valid marker code is between 00 and ff - alex */
|
||||
s->buf_ptr--;
|
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} else {
|
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/* prepare data for next start code */
|
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input_size = s->buf_ptr - s->buffer;
|
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start_code = s->start_code;
|
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s->buf_ptr = s->buffer;
|
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s->start_code = code;
|
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dprintf("marker=%x\n", start_code);
|
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dprintf("marker=%x avail_size_in_buf=%d\n", start_code, buf_end - buf_ptr);
|
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|
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if ((buf_end - buf_ptr) > s->buffer_size)
|
||||
{
|
||||
av_free(s->buffer);
|
||||
s->buffer_size = buf_end-buf_ptr;
|
||||
s->buffer = av_malloc(s->buffer_size);
|
||||
}
|
||||
|
||||
/* unescape buffer of SOS */
|
||||
if (start_code == SOS)
|
||||
{
|
||||
UINT8 *src = buf_ptr;
|
||||
UINT8 *dst = s->buffer;
|
||||
|
||||
while (src<buf_end)
|
||||
{
|
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unsigned char *x = *(src++);
|
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|
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*(dst++) = x;
|
||||
if (x == 0xff)
|
||||
{
|
||||
x = *(src++);
|
||||
if (x >= 0xd0 && x <= 0xd7)
|
||||
*(dst++) = x;
|
||||
else if (x)
|
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break;
|
||||
}
|
||||
}
|
||||
}
|
||||
else
|
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memcpy(s->buffer, buf_ptr, buf_end - buf_ptr);
|
||||
init_get_bits(&s->gb, s->buffer, s->buffer_size);
|
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|
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s->start_code = start_code;
|
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|
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/* process markers */
|
||||
if (start_code >= 0xd0 && start_code <= 0xd7) {
|
||||
dprintf("restart marker: %d\n", start_code&0x0f);
|
||||
} else if (s->first_picture) {
|
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/* APP fields */
|
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if (start_code >= 0xe0 && start_code <= 0xef)
|
||||
mjpeg_decode_app(s, start_code);
|
||||
/* Comment */
|
||||
else if (start_code == COM)
|
||||
mjpeg_decode_com(s);
|
||||
}
|
||||
|
||||
switch(start_code) {
|
||||
case SOI:
|
||||
s->restart_interval = 0;
|
||||
/* nothing to do on SOI */
|
||||
break;
|
||||
case DQT:
|
||||
mjpeg_decode_dqt(s, s->buffer, input_size);
|
||||
mjpeg_decode_dqt(s);
|
||||
break;
|
||||
case DHT:
|
||||
mjpeg_decode_dht(s, s->buffer, input_size);
|
||||
mjpeg_decode_dht(s);
|
||||
break;
|
||||
case SOF0:
|
||||
mjpeg_decode_sof0(s, s->buffer, input_size);
|
||||
mjpeg_decode_sof0(s);
|
||||
break;
|
||||
case SOS:
|
||||
mjpeg_decode_sos(s, s->buffer, input_size);
|
||||
if (s->start_code == EOI || s->buggy_avid || s->restart_interval) {
|
||||
case EOI:
|
||||
eoi_parser:
|
||||
{
|
||||
int l;
|
||||
if (s->interlaced) {
|
||||
s->bottom_field ^= 1;
|
||||
|
|
@ -1313,10 +1344,15 @@ static int mjpeg_decode_frame(AVCodecContext *avctx,
|
|||
}
|
||||
for(i=0;i<3;i++) {
|
||||
picture->data[i] = s->current_picture[i];
|
||||
#if 1
|
||||
l = s->linesize[i];
|
||||
if (s->interlaced)
|
||||
l >>= 1;
|
||||
picture->linesize[i] = l;
|
||||
#else
|
||||
picture->linesize[i] = (s->interlaced) ?
|
||||
s->linesize[i] >> 1 : s->linesize[i];
|
||||
#endif
|
||||
}
|
||||
*data_size = sizeof(AVPicture);
|
||||
avctx->height = s->height;
|
||||
|
|
@ -1342,8 +1378,15 @@ static int mjpeg_decode_frame(AVCodecContext *avctx,
|
|||
goto the_end;
|
||||
}
|
||||
break;
|
||||
case SOS:
|
||||
mjpeg_decode_sos(s);
|
||||
/* buggy avid puts EOI every 10-20th frame */
|
||||
/* if restart period is over process EOI */
|
||||
if ((s->buggy_avid && !s->interlaced) || s->restart_interval)
|
||||
goto eoi_parser;
|
||||
break;
|
||||
case DRI:
|
||||
mjpeg_decode_dri(s, s->buffer, input_size);
|
||||
mjpeg_decode_dri(s);
|
||||
break;
|
||||
case SOF1:
|
||||
case SOF2:
|
||||
|
|
@ -1359,26 +1402,24 @@ static int mjpeg_decode_frame(AVCodecContext *avctx,
|
|||
case SOF15:
|
||||
case JPG:
|
||||
printf("mjpeg: unsupported coding type (%x)\n", start_code);
|
||||
return -1;
|
||||
}
|
||||
#if 1
|
||||
if (start_code >= 0xd0 && start_code <= 0xd7) {
|
||||
dprintf("restart marker: %d\n", start_code&0x0f);
|
||||
} else if (s->first_picture) {
|
||||
/* APP fields */
|
||||
if (start_code >= 0xe0 && start_code <= 0xef)
|
||||
mjpeg_decode_app(s, s->buffer, input_size, start_code);
|
||||
/* Comment */
|
||||
else if (start_code == COM)
|
||||
mjpeg_decode_com(s, s->buffer, input_size);
|
||||
}
|
||||
#endif
|
||||
}
|
||||
break;
|
||||
// default:
|
||||
// printf("mjpeg: unsupported marker (%x)\n", start_code);
|
||||
// break;
|
||||
}
|
||||
|
||||
not_the_end:
|
||||
;
|
||||
/* eof process start code */
|
||||
buf_ptr += (get_bits_count(&s->gb)+7)/8;
|
||||
dprintf("marker parser used %d bytes (%d bits)\n",
|
||||
(get_bits_count(&s->gb)+7)/8, get_bits_count(&s->gb));
|
||||
}
|
||||
}
|
||||
}
|
||||
the_end:
|
||||
|
||||
dprintf("mjpeg decode frame unused %d bytes\n", buf_end - buf_ptr);
|
||||
// return buf_end - buf_ptr;
|
||||
return buf_ptr - buf;
|
||||
}
|
||||
|
||||
|
|
@ -1387,6 +1428,7 @@ static int mjpeg_decode_end(AVCodecContext *avctx)
|
|||
MJpegDecodeContext *s = avctx->priv_data;
|
||||
int i, j;
|
||||
|
||||
av_free(s->buffer);
|
||||
for(i=0;i<MAX_COMPONENTS;i++)
|
||||
av_free(s->current_picture[i]);
|
||||
for(i=0;i<2;i++) {
|
||||
|
|
|
|||
Loading…
Reference in New Issue