diff options
Diffstat (limited to 'debian/transcode/transcode-1.1.7/import/decode_mpeg2.c')
| -rw-r--r-- | debian/transcode/transcode-1.1.7/import/decode_mpeg2.c | 177 |
1 files changed, 177 insertions, 0 deletions
diff --git a/debian/transcode/transcode-1.1.7/import/decode_mpeg2.c b/debian/transcode/transcode-1.1.7/import/decode_mpeg2.c new file mode 100644 index 00000000..4147ae9c --- /dev/null +++ b/debian/transcode/transcode-1.1.7/import/decode_mpeg2.c @@ -0,0 +1,177 @@ +/* + * decode_mpeg2.c + * + * Copyright (C) Thomas Oestreich - June 2001 + * Copyright (C) 1999-2001 Aaron Holtzman <aholtzma@ess.engr.uvic.ca> + * + * This file is part of transcode, a video stream processing tool + * + * transcode is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2, or (at your option) + * any later version. + * + * transcode is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with GNU Make; see the file COPYING. If not, write to + * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. + * + */ + +#include "transcode.h" +#include "tcinfo.h" + +#include "ioaux.h" +#include "tc.h" + +#include "libtc/libtc.h" + +#if defined(HAVE_LIBMPEG2) && defined(HAVE_LIBMPEG2CONVERT) + +#include <mpeg2dec/mpeg2.h> +#include <mpeg2dec/mpeg2convert.h> + +#define BUFFER_SIZE 262144 +static uint8_t buffer[BUFFER_SIZE]; + +/* ------------------------------------------------------------ + * helper functions + * ------------------------------------------------------------*/ + +typedef void (*WriteDataFn)(decode_t *decode, const mpeg2_info_t *info, + const mpeg2_sequence_t *sequence); + +static void show_accel(uint32_t mp_ac) +{ + tc_log_info(__FILE__, "libmpeg2 acceleration: %s", + (mp_ac & MPEG2_ACCEL_X86_3DNOW) ? "3dnow" : + (mp_ac & MPEG2_ACCEL_X86_MMXEXT) ? "mmxext" : + (mp_ac & MPEG2_ACCEL_X86_MMX) ? "mmx" : + "none (plain C)"); +} + +#define WRITE_DATA(PBUF, LEN, TAG) do { \ + int ret = tc_pwrite(decode->fd_out, PBUF, LEN); \ + if(LEN != ret) { \ + tc_log_error(__FILE__, "failed to write %s data" \ + " of frame (len=%i)", \ + TAG, ret); \ + import_exit(1); \ + } \ +} while (0) + + +static void write_rgb24(decode_t *decode, const mpeg2_info_t *info, + const mpeg2_sequence_t *sequence) +{ + int len = 0; + /* FIXME: move to libtc/tcframes routines? */ + + len = 3 * info->sequence->width * info->sequence->height; + WRITE_DATA(info->display_fbuf->buf[0], len, "RGB"); +} + +static void write_yuv420p(decode_t *decode, const mpeg2_info_t *info, + const mpeg2_sequence_t *sequence) +{ + static const char *plane_id[] = { "Y", "U", "V" }; + int len = 0; + /* FIXME: move to libtc/tcframes routines? */ + + len = sequence->width * sequence->height; + WRITE_DATA(info->display_fbuf->buf[0], len, plane_id[0]); + + len = sequence->chroma_width * sequence->chroma_height; + WRITE_DATA(info->display_fbuf->buf[1], len, plane_id[1]); + WRITE_DATA(info->display_fbuf->buf[2], len, plane_id[2]); +} + + +/* ------------------------------------------------------------ + * decoder entry point + * ------------------------------------------------------------*/ + +void decode_mpeg2(decode_t *decode) +{ + mpeg2dec_t *decoder = NULL; + const mpeg2_info_t *info = NULL; + const mpeg2_sequence_t *sequence = NULL; + mpeg2_state_t state; + size_t size; + uint32_t ac = 0; + + WriteDataFn writer = write_yuv420p; + if (decode->format == TC_CODEC_RGB) { + tc_log_info(__FILE__, "using libmpeg2convert" + " RGB24 conversion"); + writer = write_rgb24; + } + + ac = mpeg2_accel(MPEG2_ACCEL_DETECT); + show_accel(ac); + + decoder = mpeg2_init(); + if (decoder == NULL) { + tc_log_error(__FILE__, "Could not allocate a decoder object."); + import_exit(1); + } + info = mpeg2_info(decoder); + + size = (size_t)-1; + do { + state = mpeg2_parse(decoder); + sequence = info->sequence; + switch (state) { + case STATE_BUFFER: + size = tc_pread(decode->fd_in, buffer, BUFFER_SIZE); + mpeg2_buffer(decoder, buffer, buffer + size); + break; + case STATE_SEQUENCE: + if (decode->format == TC_CODEC_RGB) { + mpeg2_convert(decoder, mpeg2convert_rgb24, NULL); + } + break; + case STATE_SLICE: + case STATE_END: + case STATE_INVALID_END: + if (info->display_fbuf) { + writer(decode, info, sequence); + } + break; + default: + /* can't happen */ + break; + } + } while (size); + + mpeg2_close(decoder); + import_exit(0); +} + +#else /* defined(HAVE_LIBMPEG2) && defined(HAVE_LIBMPEG2CONVERT) */ + +void decode_mpeg2(decode_t *decode) +{ + tc_log_error(__FILE__, "No support for MPEG2 configured -- exiting"); + import_exit(1); +} + + +#endif /* defined(HAVE_LIBMPEG2) && defined(HAVE_LIBMPEG2CONVERT) */ + + +/*************************************************************************/ + +/* + * Local variables: + * c-file-style: "stroustrup" + * c-file-offsets: ((case-label . *) (statement-case-intro . *)) + * indent-tabs-mode: nil + * End: + * + * vim: expandtab shiftwidth=4: + */ |