[vlc-devel] [PATCH 2/2] demux: wav: support parsing INFO chunk
Rémi Denis-Courmont
remi at remlab.net
Tue Sep 15 21:22:45 CEST 2020
Hi,
Le tiistaina 15. syyskuuta 2020, 17.26.39 EEST Zhao, Gang a écrit :
> Parse INFO chunk and save meta data to vlc.
>
> Feature ticket: https://trac.videolan.org/vlc/ticket/6587
>
> Signed-off-by: Zhao, Gang <gang.zhao.42 at gmail.com>
> ---
> modules/demux/wav.c | 191 ++++++++++++++++++++++++++++++++++++++++++++
> 1 file changed, 191 insertions(+)
>
> diff --git modules/demux/wav.c modules/demux/wav.c
> index 52f9639ef9..e09734579a 100644
> --- modules/demux/wav.c
> +++ modules/demux/wav.c
> @@ -36,6 +36,8 @@
> #include <vlc_demux.h>
> #include <vlc_aout.h>
> #include <vlc_codecs.h>
> +#include <vlc_charset.h>
> +#include <vlc_meta.h>
>
> #include "windows_audio_commons.h"
>
> @@ -58,12 +60,39 @@ typedef struct
> uint32_t i_channel_mask;
> uint8_t i_chans_to_reorder; /* do we need channel reordering
> */ uint8_t pi_chan_table[AOUT_CHAN_MAX];
> +
> + vlc_meta_t *p_meta;
> } demux_sys_t;
>
> enum wav_chunk_id {
> + wav_chunk_id_list,
> wav_chunk_id_data,
> wav_chunk_id_ds64,
> wav_chunk_id_fmt,
> +
> + wav_info_chunk_id_iarl,
> + wav_info_chunk_id_iart,
> + wav_info_chunk_id_icms,
> + wav_info_chunk_id_icmt,
> + wav_info_chunk_id_icop,
> + wav_info_chunk_id_icrd,
> + wav_info_chunk_id_icrp,
> + wav_info_chunk_id_idim,
> + wav_info_chunk_id_idpi,
> + wav_info_chunk_id_ieng,
> + wav_info_chunk_id_ignr,
> + wav_info_chunk_id_ikey,
> + wav_info_chunk_id_ilgt,
> + wav_info_chunk_id_imed,
> + wav_info_chunk_id_inam,
> + wav_info_chunk_id_iplt,
> + wav_info_chunk_id_iprd,
> + wav_info_chunk_id_isbj,
> + wav_info_chunk_id_isft,
> + wav_info_chunk_id_ishp,
> + wav_info_chunk_id_isrc,
> + wav_info_chunk_id_isrf,
> + wav_info_chunk_id_itch,
> };
>
> struct wav_chunk_id_key
> @@ -74,12 +103,54 @@ struct wav_chunk_id_key
>
> static const struct wav_chunk_id_key wav_chunk_id_key_list[] = {
> /* Alphabetical order */
> + { wav_chunk_id_list, "LIST" },
> { wav_chunk_id_data, "data" },
> { wav_chunk_id_ds64, "ds64" },
> { wav_chunk_id_fmt, "fmt " },
> };
> static const size_t wav_chunk_id_key_count =
> ARRAY_SIZE(wav_chunk_id_key_list);
>
> +static const struct wav_chunk_id_key wav_info_chunk_id_key_list[] = {
> + /* Alphabetical order */
> + { wav_info_chunk_id_iarl, "IARL" },
> + { wav_info_chunk_id_iart, "IART" },
> + { wav_info_chunk_id_icms, "ICMS" },
> + { wav_info_chunk_id_icmt, "ICMT" },
> + { wav_info_chunk_id_icop, "ICOP" },
> + { wav_info_chunk_id_icrd, "ICRD" },
> + { wav_info_chunk_id_icrp, "ICRP" },
> + { wav_info_chunk_id_idim, "IDIM" },
> + { wav_info_chunk_id_idpi, "IDPI" },
> + { wav_info_chunk_id_ieng, "IENG" },
> + { wav_info_chunk_id_ignr, "IGNR" },
> + { wav_info_chunk_id_ikey, "IKEY" },
> + { wav_info_chunk_id_ilgt, "ILGT" },
> + { wav_info_chunk_id_imed, "IMED" },
> + { wav_info_chunk_id_inam, "INAM" },
> + { wav_info_chunk_id_iplt, "IPLT" },
> + { wav_info_chunk_id_iprd, "IPRD" },
> + { wav_info_chunk_id_isbj, "ISBJ" },
> + { wav_info_chunk_id_isft, "ISFT" },
> + { wav_info_chunk_id_ishp, "ISHP" },
> + { wav_info_chunk_id_isrc, "ISRC" },
> + { wav_info_chunk_id_isrf, "ISRF" },
> + { wav_info_chunk_id_itch, "ITCH" },
> +};
You could just as well use a table with designated initializers here.
> +static const size_t wav_info_chunk_id_key_count =
> ARRAY_SIZE(wav_info_chunk_id_key_list); +
> +/* get string type of INFO chunk id from enum */
> +static const char *wav_info_chunk_id_to_key(enum wav_chunk_id id)
> +{
> + if ( id < wav_info_chunk_id_iarl || id > wav_info_chunk_id_itch )
> + return "";
> +
> + for ( int i = 0; i < wav_info_chunk_id_key_count; i++)
> + if (wav_info_chunk_id_key_list[i].id == id)
> + return wav_info_chunk_id_key_list[i].key;
Err, why use a linear search, when you could directly index the table?
> +
> + return "";
> +}
> +
> static int
> wav_chunk_CompareCb(const void *a, const void *b)
> {
> @@ -320,6 +391,10 @@ static void Close ( vlc_object_t * p_this )
> demux_sys_t *p_sys = p_demux->p_sys;
>
> es_format_Clean( &p_sys->fmt );
> +
> + if( p_sys->p_meta )
> + vlc_meta_Delete( p_sys->p_meta );
> +
> free( p_sys );
> }
>
> @@ -594,6 +669,114 @@ error:
> return VLC_EGENERIC;
> }
>
> +static int ChunkParseINFO( demux_t *p_demux, uint32_t i_size )
> +{
> + demux_sys_t *p_sys = p_demux->p_sys;
> + const uint8_t *p_peek;
> + enum wav_chunk_id id;
> + uint32_t chunk_size;
> + int meta_type;
> + char *meta_value;
> +
> + if( (p_sys->p_meta = vlc_meta_New()) == NULL )
Don't use assignment as truth value unless necessary.
> + {
> + msg_Err( p_demux, "vlc_meta_New failed" );
> + return VLC_EGENERIC;
> + }
> +
> + while (i_size > 0) {
> + int ret = ChunkGetNext( p_demux, &id, &chunk_size,
> + wav_info_chunk_id_key_list,
> + wav_info_chunk_id_key_count );
> + if ( ret != VLC_SUCCESS )
> + break;
> +
> + /* chunk id(4 bytes) and chunk size(4 bytes) consumed by
> ChunkGetNext */ + i_size -= 8;
> +
> + if( chunk_size == 0 )
> + {
> + msg_Err( p_demux, "invalid chunk with a size 0" );
> + return VLC_EGENERIC;
> + }
> +
> + if( vlc_stream_Peek( p_demux->s, &p_peek, chunk_size ) !=
> chunk_size ) + return VLC_EGENERIC;
> +
> + meta_value = strndup( (const char *)p_peek, chunk_size );
> + if (meta_value == NULL)
> + return VLC_EGENERIC;
> +
> + EnsureUTF8( meta_value );
> +
> + meta_type = -1;
> + switch( id )
> + {
> + case wav_info_chunk_id_iart:
> + meta_type = vlc_meta_Artist;
> + break;
> + case wav_info_chunk_id_icop:
> + meta_type = vlc_meta_Copyright;
> + break;
> + case wav_info_chunk_id_icrd:
> + meta_type = vlc_meta_Date;
> + break;
> + case wav_info_chunk_id_ignr:
> + meta_type = vlc_meta_Genre;
> + break;
> + case wav_info_chunk_id_inam:
> + meta_type = vlc_meta_Title;
> + break;
> + default:
> + /* no relevant meta type in vlc */
> + break;
> + }
> +
> + msg_Dbg( p_demux, "id: %s meta_type: %d meta_value: %s\n",
> + wav_info_chunk_id_to_key(id), meta_type, meta_value );
> +
> + if (meta_type != -1)
> + vlc_meta_Set( p_sys->p_meta, meta_type, meta_value );
> + else
> + vlc_meta_AddExtra( p_sys->p_meta,
> + wav_info_chunk_id_key_list[id].key,
> meta_value ); +
> + free( meta_value );
> + if( ChunkSkip( p_demux, chunk_size ) != VLC_SUCCESS )
> + return VLC_EGENERIC;
> +
> + i_size -= chunk_size;
> + }
> +
> + return VLC_SUCCESS;
> +}
> +
> +static int ChunkParseLIST( demux_t *p_demux, uint32_t i_size )
> +{
> + const uint8_t *p_peek;
> +
> + /* must have four bytes list type */
> + if( i_size < 4 )
> + {
> + msg_Err( p_demux, "invalid 'LIST' chunk" );
> + return VLC_EGENERIC;
> + }
> +
> + if( vlc_stream_Peek( p_demux->s, &p_peek, 4 ) != 4 )
> + return VLC_EGENERIC;
> +
> + /* only care about INFO chunk */
> + if ( memcmp(p_peek, "INFO", 4) != 0 ) {
> + return ChunkSkip( p_demux, i_size );
> + }
> +
> + if ( vlc_stream_Read( p_demux->s, NULL, 4) != 4 )
> + return VLC_EGENERIC;
> +
> + i_size -= 4;
> + return ChunkParseINFO( p_demux, i_size );
> +}
> +
> static int Open( vlc_object_t * p_this )
> {
> demux_t *p_demux = (demux_t*)p_this;
> @@ -684,6 +867,14 @@ static int Open( vlc_object_t * p_this )
> if( ChunkParseFmt( p_demux, i_size ) != VLC_SUCCESS )
> goto error;
> break;
> + case wav_chunk_id_list:
> + if( ChunkParseLIST( p_demux, i_size ) != VLC_SUCCESS )
> + goto error;
> + break;
> + default:
> + if( ChunkSkip( p_demux, i_size ) != VLC_SUCCESS )
> + goto error;
> + break;
> }
> }
--
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